#55

backend/app/controllers/materials_controller.rb

@@ -70,10 +70,7 @@ class MaterialsController < ApplicationController
         .find_by(id: params[:id])
     return head :not_found unless material
 
-    wiki_page_body =
-        TagDescription
-        .find_by(tag_id: material.tag_id, language_code: locale.language_code)
-        &.body
+    wiki_page_body = material.tag&.tag_name('ja')&.wiki_page&.current_revision&.body
 
     render json: MaterialRepr.base(material, host: request.base_url,
                                    language_code: locale.language_code).merge(wiki_page_body:)

backend/app/controllers/nico_tags_controller.rb

@@ -26,7 +26,7 @@ class NicoTagsController < ApplicationController
         ExternalTag
         .joins("LEFT JOIN (#{ post_tag_max_sql }) post_tag_max " \
                'ON post_tag_max.external_tag_id = external_tags.id')
-        .includes(linked_tags: [:tag_names, :tag_descriptions])
+        .includes(linked_tags: { tag_names: :wiki_page })
     if name
       q = q.where(('external_tags.name LIKE ? ' +
                    "OR CONCAT(external_tags.platform, ':', external_tags.name) LIKE ?"),

backend/app/controllers/posts_controller.rb

@@ -53,7 +53,7 @@ class PostsController < ApplicationController
         .reselect('posts.*', Arel.sql("#{ updated_at_all_sql } AS updated_at_all"))
         .preload(:external_tags, :uploaded_user, :parents, :children,
                  post_tags: [:sections, { tag: [:deerjikists, :materials,
-                                                :tag_names, :tag_descriptions] }])
+                                                { tag_names: :wiki_page }] }])
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -111,7 +111,7 @@ class PostsController < ApplicationController
         filtered_posts(locale)
         .preload(:uploaded_user, :parents, :children,
                  post_tags: [:sections, { tag: [:deerjikists, :materials,
-                                                :tag_names, :tag_descriptions] }])
+                                                { tag_names: :wiki_page }] }])
         .with_attached_thumbnail
         .order('RAND()')
         .first
@@ -198,7 +198,7 @@ class PostsController < ApplicationController
         Post
         .includes(:uploaded_user, :parents, :children,
                   post_tags: [:sections, { tag: [:deerjikists, :materials,
-                                                 :tag_names, :tag_descriptions] }])
+                                                 { tag_names: :wiki_page }] }])
         .with_attached_thumbnail
         .find_by(id: params[:id])
     return head :not_found unless post

backend/app/controllers/tag_descriptions_controller.rb

@@ -1,57 +0,0 @@
-class TagDescriptionsController < ApplicationController
-  def show
-    description = TagDescription.find_by(tag_id: params[:id], language_code: 'ja')
-    return head :not_found unless description
-
-    render json: representation(description)
-  end
-
-  def show_by_title
-    tag_name = TagName.find_by(language_code: 'ja', name: params[:name].to_s.strip)
-    description = tag_name&.tag && TagDescription.find_by(tag: tag_name.tag, language_code: 'ja')
-    return head :not_found unless description
-
-    render json: representation(description)
-  end
-
-  def update
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    body = params[:body].to_s
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
-
-    tag = Tag.find_by(id: params[:id])
-    return head :not_found unless tag
-
-    description = TagDescription.find_by(tag:, language_code: 'ja')
-
-    if description
-      TagDescriptionOperation.update!(tag:, body:, updated_by_user: current_user)
-      description.reload
-      render json: representation(description)
-    else
-      TagDescriptionOperation.create!(tag:, body:, created_by_user: current_user)
-      description = TagDescription.find_by!(tag:, language_code: 'ja')
-      render json: representation(description), status: :created
-    end
-  rescue ActiveRecord::RecordInvalid => e
-    render_validation_error e.record
-  rescue ActiveRecord::RecordNotUnique
-    render_record_not_unique
-  end
-
-  private
-
-  def representation description
-    description.as_json(only: [
-        :tag_id,
-        :language_code,
-        :body,
-        :version_no,
-        :created_by_user_id,
-        :updated_by_user_id,
-        :created_at,
-        :updated_at])
-  end
-end

backend/app/controllers/tag_groups_controller.rb

@@ -1,39 +0,0 @@
-class TagGroupsController < ApplicationController
-  def index
-    groups = TagGroup.includes(:created_by_user, :updated_by_user).order(:id)
-    render json: TagGroupRepr.many(groups.to_a)
-  end
-
-  def show
-    group = TagGroup.includes(:created_by_user, :updated_by_user).find_by(id: params[:id])
-    return head :not_found unless group
-
-    render json: TagGroupRepr.one(group)
-  end
-
-  def create
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    group = TagGroupOperation.create!(**write_attributes, actor: current_user)
-    render json: TagGroupRepr.one(group), status: :created
-  end
-
-  def update
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    group = TagGroup.find_by(id: params[:id])
-    return head :not_found unless group
-
-    TagGroupOperation.update!(group:, **write_attributes, actor: current_user)
-    render json: TagGroupRepr.one(group.reload)
-  end
-
-  private
-
-  def write_attributes
-    { name: params[:name], description: params[:description],
-      members: params[:members], placements: params[:placements] }
-  end
-end

backend/app/controllers/tag_versions_controller.rb

@@ -51,7 +51,7 @@ class TagVersionsController < ApplicationController
 
       tags_by_id =
           Tag
-          .includes(:tag_names, :materials, :tag_descriptions, parents: :tag_descriptions)
+          .includes(:tag_names, :materials, tag_names: :wiki_page)
           .where(id: all_parent_tag_ids)
           .index_by(&:id)
 

backend/app/controllers/tags_controller.rb

@@ -175,7 +175,7 @@ class TagsController < ApplicationController
     tags_by_id =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :materials, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, :materials, tag_names: :wiki_page)
         .where(tag_names: { language_code: locale.language_code, primary_flg: true },
                id: tag_ids)
         .index_by(&:id)
@@ -238,7 +238,7 @@ class TagsController < ApplicationController
     base =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :materials, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, :materials, tag_names: :wiki_page)
         .where(tag_names: { language_code: locale.language_code, primary_flg: true },
                deprecated_at: nil)
     base = base.where('tags.post_count > 0') if present_only
@@ -282,7 +282,7 @@ class TagsController < ApplicationController
     tag =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :materials, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, :materials, tag_names: :wiki_page)
         .find_by(id: params[:id],
                  tag_names: { language_code: locale.language_code, primary_flg: true })
     return render json: TagRepr.base(tag, language_code: locale.language_code) if tag
@@ -302,7 +302,7 @@ class TagsController < ApplicationController
     tag =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :materials, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, :materials, tag_names: :wiki_page)
         .find_by(tag_names: { name:, language_code: locale.language_code, primary_flg: true })
     return render json: TagRepr.base(tag, language_code: locale.language_code) if tag
 
@@ -320,7 +320,7 @@ class TagsController < ApplicationController
 
     tag = 
         Tag.joins(:tag_names)
-        .includes(:tag_names, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, tag_names: :wiki_page)
         .find_by(id: params[:id],
                  tag_names: { language_code: locale.language_code, primary_flg: true })
     return head :not_found unless tag
@@ -340,7 +340,7 @@ class TagsController < ApplicationController
     tag =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, tag_names: :wiki_page)
         .find_by(tag_names: { name:, language_code: locale.language_code, primary_flg: true })
     return head :not_found unless tag
 
@@ -359,7 +359,7 @@ class TagsController < ApplicationController
     tag =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, tag_names: :wiki_page)
         .find_by(id: params[:id],
                  tag_names: { language_code: locale.language_code, primary_flg: true })
     return head :not_found unless tag
@@ -424,7 +424,7 @@ class TagsController < ApplicationController
     tag =
         Tag
         .joins(:tag_names)
-        .includes(:tag_names, :materials, :tag_descriptions, parents: :tag_descriptions)
+        .includes(:tag_names, :materials, tag_names: :wiki_page)
         .find_by(tag_names: { name:, language_code: locale.language_code, primary_flg: true })
     return head :not_found unless tag
 
@@ -464,6 +464,7 @@ class TagsController < ApplicationController
 
       old_name = tag.name(locale.language_code)
       name_changed = name != old_name
+      wiki_page = tag.tag_name(locale.language_code)&.wiki_page if name_changed
 
       if tag.deprecated? == deprecated
         tag.update!(category:)
@@ -484,7 +485,9 @@ class TagsController < ApplicationController
           tag,
           event_type: :update,
           created_by_user: current_user,
-          language_code: locale.language_code)
+          language_code: locale.language_code,
+          name_changed:,
+          wiki_page:)
     end
 
     render json: TagRepr.base(tag.reload, language_code: locale.language_code)
@@ -515,6 +518,7 @@ class TagsController < ApplicationController
 
       old_name = tag.name(locale.language_code)
       name_changed = name.present? && name != old_name
+      wiki_page = tag.tag_name(locale.language_code)&.wiki_page if name_changed
 
       rename_tag_name!(locale, tag, name) if name_changed
       tag.update!(category:) if category.present?
@@ -528,7 +532,9 @@ class TagsController < ApplicationController
           tag,
           event_type: :update,
           created_by_user: current_user,
-          language_code: locale.language_code)
+          language_code: locale.language_code,
+          name_changed:,
+          wiki_page:)
     end
 
     render json: TagRepr.base(tag.reload, language_code: locale.language_code)
@@ -716,8 +722,19 @@ class TagsController < ApplicationController
             language_code:))
   end
 
-  def record_tag_version! tag, event_type:, created_by_user:, language_code: 'ja'
+  def record_tag_version! tag, event_type:, created_by_user:, language_code: 'ja',
+                          name_changed: false, wiki_page: nil
     TagVersionRecorder.record!(tag:, event_type:, created_by_user:, language_code:)
+
+    return unless name_changed
+
+    wiki_page ||= tag.tag_name('ja')&.wiki_page
+    return unless wiki_page&.wiki_versions&.exists?
+
+    WikiVersionRecorder.record!(
+        page: wiki_page,
+        event_type: :update,
+        created_by_user:)
   end
 
   def validate_tag_rename locale, tag, name

backend/app/controllers/wiki_pages_controller.rb

@@ -2,78 +2,47 @@ class WikiPagesController < ApplicationController
   rescue_from Wiki::Commit::Conflict, with: :render_wiki_conflict
 
   def index
-    # 互換性のための化石リソース
-
     title = params[:title].to_s.strip
-    descriptions =
-        TagDescription.where(language_code: 'ja')
-        .includes(tag: :tag_names)
-
-    descriptions = descriptions.order(updated_at: :desc, id: :asc)
-    tag_groups = TagGroup.order(updated_at: :desc, id: :asc)
-    if title.present?
-      pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
-      descriptions =
-          descriptions.joins(tag: :tag_names)
-          .where(tag_names: { language_code: 'ja', primary_flg: true })
-          .where('tag_names.name LIKE ?', pattern).limit(20)
-      tag_groups = tag_groups.where(
-          'CONCAT(?, name) LIKE ?', TagGroupRepr::PREFIX, pattern).limit(20)
+    if title.blank?
+      return render json: WikiPageRepr.base(
+          WikiPage.joins(:tag_name).includes(tag_name: :tag))
     end
 
-    json = descriptions.map { |description| WikiPageRepr.tag_description(description) }
-    json.concat(tag_groups.map { WikiPageRepr.tag_group(_1) })
-    json.sort_by! do |row|
-      [-row['updated_at'].to_f, row.fetch('resource_type'), row.fetch('id')]
-    end
-    json = json.first(20) if title.present?
-    render json:
+    q = WikiPage.joins(:tag_name).includes(tag_name: :tag)
+        .where('tag_names.name LIKE ?', "%#{ WikiPage.sanitize_sql_like(title) }%")
+    render json: WikiPageRepr.base(q.limit(20))
   end
 
   def show
-    tag_description = TagDescription.find_by(id: params[:id])
-
-    return render_wiki_page_by_tag_description tag_description if tag_description
-
-    tag_group = TagGroup.find_by(id: params[:id])
-    return render_tag_group tag_group if tag_group
-
-    render_wiki_page_or_404 nil
+    page = WikiPage.joins(:tag_name)
+                   .includes(tag_name: :tag)
+                   .find_by(id: params[:id])
+    render_wiki_page_or_404 page
   end
 
   def show_by_title
     title = params[:title].to_s.strip
-
-    if title.start_with?(TagGroupRepr::PREFIX)
-      name = title.delete_prefix(TagGroupRepr::PREFIX)
-      tag_group = TagGroup.find_by(name:)
-      return render_tag_group tag_group if tag_group
-      return head :not_found
-    end
-
-    tag_description = tag_description_by_title(title)
-
-    return render_wiki_page_by_tag_description tag_description if tag_description
-
-    render_wiki_page_or_404 nil
+    page = WikiPage.joins(:tag_name)
+                   .includes(tag_name: :tag)
+                   .find_by(tag_name: { name: title })
+    render_wiki_page_or_404 page
   end
 
   def exists
-    return head :no_content if TagDescription.exists?(id: params[:id])
-    return head :no_content if TagGroup.exists?(id: params[:id])
-
-    head :not_found
+    if WikiPage.exists?(id: params[:id])
+      head :no_content
+    else
+      head :not_found
+    end
   end
 
   def exists_by_title
     title = params[:title].to_s.strip
-    if title.start_with?(TagGroupRepr::PREFIX)
-      exists = TagGroup.exists?(name: title.delete_prefix(TagGroupRepr::PREFIX))
-      return head exists ? :no_content : :not_found
+    if WikiPage.joins(:tag_name).exists?(tag_names: { name: title })
+      head :no_content
+    else
+      head :not_found
     end
-    return head :no_content if tag_description_by_title(title)
-
-    head :not_found
   end
 
   def diff
@@ -83,41 +52,35 @@ class WikiPagesController < ApplicationController
     from = params[:from].presence
     to = params[:to].presence
 
-    description = TagDescription.find_by(id:)
-    if description
-      versions = description_versions(description)
-      from_rev = from && versions.find(from)
-      to_rev = to ? versions.find(to) : versions.find_by!(version_no: description.version_no)
-      resource = WikiPageRepr.tag_description(description)
-    else
-      tag_group = TagGroup.find_by(id:)
-      if tag_group
-        from_rev = from && group_version(tag_group, from)
-        to_rev = to ? group_version(tag_group, to) : current_group_version(tag_group)
-        return head :not_found if (from && !from_rev) || !to_rev
+    page = WikiPage.joins(:tag_name).includes(tag_name: :tag).find(id)
 
-        from_body = from_rev && render_group_version(from_rev)
-        to_body = render_group_version(to_rev)
-        resource = { 'id' => tag_group.id,
-                     'title' => "#{ TagGroupRepr::PREFIX }#{ tag_group.name }",
-                     'deprecated_at' => nil }
-      else
-        return head :not_found
-      end
+    from_rev = from && page.wiki_revisions.find(from)
+    to_rev = to ? page.wiki_revisions.find(to) : page.current_revision
+    if ((from_rev && !(from_rev.content?)) || !(to_rev&.content?))
+      return render_unprocessable_entity('差分を表示できない版です．')
     end
 
-    from_body ||= from_rev&.body
-    to_body ||= to_rev.body
-    diff_json = wiki_diff(from_body, to_body)
+    diffs = Diff::LCS.sdiff(from_rev&.body&.lines || [], to_rev.body.lines)
+    diff_json = diffs.map { |change|
+      case change.action
+      when ?=
+        { type: 'context', content: change.old_element }
+      when ?!
+        [{ type: 'removed', content: change.old_element },
+         { type: 'added', content: change.new_element }]
+      when ?+
+        { type: 'added', content: change.new_element }
+      when ?-
+        { type: 'removed', content: change.old_element }
+      end
+    }.flatten.compact
 
-    render json: { wiki_page_id:      resource.fetch('id'),
-                   title:             resource.fetch('title'),
-                   deprecated_at:     resource.fetch('deprecated_at'),
+    render json: { wiki_page_id:      page.id,
+                   title:             page.title,
+                   deprecated_at:     page.deprecated_at,
                    older_revision_id: from_rev&.id,
                    newer_revision_id: to_rev.id,
                    diff:              diff_json }
-  rescue TagGroupMarkdownRenderer::UnsupportedStructure => error
-    render_unprocessable_entity(error.message)
   end
 
   def create
@@ -131,36 +94,24 @@ class WikiPagesController < ApplicationController
     return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
     return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
 
-    if title.start_with?(TagGroupRepr::PREFIX)
-      name = title.delete_prefix(TagGroupRepr::PREFIX)
-      parsed = TagGroupMarkdownParser.parse(body:, group: nil)
-      group = TagGroupOperation.create!(name:, **parsed, actor: current_user,
-                                         require_compatibility: true)
-      version = current_group_version(group)
-      return render_group_representation(TagGroupRepr.one(group), version,
-                                         body: parsed.fetch(:compatibility_body),
-                                         status: :created)
+    tag_name = TagName.find_or_create_by!(language_code: 'ja', name: title) do |name|
+      name.script_code = 'Jpan'
+      name.primary_flg = true
+      name.auto_generated = false
     end
 
     page =
-        if title.include?(':')
-          return render_unprocessable_entity field: :title
-        else
-          tag_name = TagName.find_by(language_code: 'ja', name: title)
-          return render_unprocessable_entity field: :title unless tag_name&.tag
+        Wiki::Commit.create_content!(
+            tag_name:,
+            body:,
+            created_by_user: current_user,
+            message:)
 
-          TagDescriptionOperation.create!(
-              tag: tag_name.tag, body:, created_by_user: current_user, message:)
-        end
-
-    description = TagDescription.find_by!(tag_id: page.tag_name.tag_id, language_code: 'ja')
-    render json: WikiPageRepr.tag_description(description), status: :created
+    render json: WikiPageRepr.base(page), status: :created
   rescue ActiveRecord::RecordInvalid => e
     render_validation_error e.record
   rescue ActiveRecord::RecordNotUnique
     render_record_not_unique
-  rescue TagGroupMarkdownParser::InvalidDocument => error
-    render_unprocessable_entity(error.message)
   end
 
   def update
@@ -173,190 +124,65 @@ class WikiPagesController < ApplicationController
     return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
     return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
 
-    group = TagGroup.find_by(id: params[:id])
-    if title.start_with?(TagGroupRepr::PREFIX)
-      return head :not_found unless group
-
-      name = title.delete_prefix(TagGroupRepr::PREFIX)
-      parsed = TagGroupMarkdownParser.parse(body:, group:)
-      TagGroupOperation.update!(group:, name:, **parsed, actor: current_user,
-                                require_compatibility: true)
-      return head :ok
-    end
-
-    return render_unprocessable_entity field: :title if title.include?(':')
-    description = TagDescription.find_by(id: params[:id])
-    unless description
-      return render_unprocessable_entity field: :title if group || WikiPage.exists?(id: params[:id])
-      return head :not_found
-    end
-    tag = description.tag
-    tag_name = TagDescriptionOperation.compatibility_tag_name(tag)
-    if tag_name.name.include?(':') || (group && title != tag_name.name)
-      return render_unprocessable_entity field: :title
-    end
-
+    page = WikiPage.find(params[:id])
     base_revision_id = params[:base_revision_id].presence
 
     ApplicationRecord.transaction do
-      tag.lock!
-      old_title = tag_name.name
-      if title != old_title
+      page.lock!
+
+      old_title = page.title
+
+      tag = Tag.find_by(tag_name_id: page.tag_name_id)
+
+      if tag && title != old_title
         TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
       end
 
-      tag_name.update!(name: title) if title != old_title
+      page.tag_name.update!(name: title) if title != old_title
 
       message = params[:message].presence
-      TagDescriptionOperation.update!(tag:, body:, updated_by_user: current_user,
-                                      message:, base_revision_id:)
+      Wiki::Commit.content!(page:,
+                            body:,
+                            created_user: current_user,
+                            message:,
+                            base_revision_id:)
 
-      if title != old_title
+      if tag && title != old_title
         tag.reload
         TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
       end
     end
 
     head :ok
-  rescue ActiveRecord::RecordInvalid => e
-    render_validation_error e.record
-  rescue ActiveRecord::RecordNotUnique
-    render_record_not_unique
-  rescue TagGroupMarkdownParser::InvalidDocument => error
-    render_unprocessable_entity(error.message)
+  end
+
+  def search
+    index
   end
 
   def changes
     id = params[:id].presence
-    description = id && TagDescription.find_by(id:)
-    if description
-      return render json: description_changes(TagDescription.where(id: description.id))
-    end
+    q = WikiRevision.joins(wiki_page: :tag_name)
+                    .includes(:created_user, wiki_page: { tag_name: :tag })
+                    .order(id: :desc)
+    q = q.where(wiki_page_id: id) if id
 
-    tag_group = id && TagGroup.find_by(id:)
-    if tag_group
-      return render json: tag_group_changes(TagGroupVersion.where(tag_group_id: tag_group.id))
-    end
-
-    json = []
-    unless id
-      json.concat(tag_group_changes(TagGroupVersion.all))
-      json.concat(description_changes(TagDescription.where(language_code: 'ja')))
-      json = json.each_with_index.sort_by do |row, index|
-        [-row.fetch(:timestamp).to_f, index]
-      end.map(&:first)
-    end
-    render json: json.first(200)
+    render json: q.limit(200).map { |rev|
+      { revision_id:  rev.id,
+        pred:         rev.base_revision_id,
+        succ:         nil,
+        wiki_page:    { id: rev.wiki_page_id,
+                        title: rev.wiki_page.title,
+                        deprecated_at: rev.wiki_page.deprecated_at },
+        user:         rev.created_user && { id: rev.created_user.id, name: rev.created_user.name },
+        kind:         rev.kind,
+        message:      rev.message,
+        timestamp:    rev.created_at }
+    }.compact
   end
 
   private
 
-  def legacy_group_page? page
-    return false unless page
-    return true if page.title.start_with?(TagGroupRepr::PREFIX)
-
-    prefix = ApplicationRecord.sanitize_sql_like(TagGroupRepr::PREFIX)
-    page.wiki_versions.where('title LIKE ?', "#{ prefix }%").exists?
-  end
-
-  def legacy_update_identified? page, title, group
-    return false unless page
-    return true if page.title == title
-    return false if title == group.name
-
-    namespace = page.title.split(':', 2)
-    return true if namespace.size == 2 && title.start_with?("#{ namespace.first }:")
-
-    base = params[:base_revision_id].presence
-    base && page.wiki_revisions.exists?(id: base)
-  end
-
-  def render_tag_group group
-    version = if params[:version].present?
-      group_version(group, params[:version])
-    else
-      current_group_version(group)
-    end
-    return head :not_found unless version
-
-    representation = if params[:version].present?
-      TagGroupRepr.historical(version)
-    else
-      TagGroupRepr.one(group)
-    end
-    render_group_representation(representation, version)
-  end
-
-  def render_group_version version
-    representation = TagGroupRepr.historical(version)
-    TagGroupMarkdownRenderer.render(representation)
-  end
-
-  def render_group_representation representation, version, body: nil, status: :ok
-    body ||= TagGroupMarkdownRenderer.render(representation)
-    versions = TagGroupVersion.where(tag_group_id: version.tag_group_id)
-    pred = versions.find_by(version_no: version.version_no - 1)&.id
-    succ = versions.find_by(version_no: version.version_no + 1)&.id
-    updated_at = version.created_at
-    render json: {
-        'id' => version.tag_group_id,
-        'resource_type' => 'tag_group',
-        'title' => "#{ TagGroupRepr::PREFIX }#{ representation.fetch('name') }",
-        'deprecated_at' => nil,
-        'body' => body,
-        'revision_id' => version.id,
-        'pred' => pred,
-        'succ' => succ,
-        'updated_at' => updated_at }, status:
-  rescue TagGroupMarkdownRenderer::UnsupportedStructure => error
-    render_unprocessable_entity(error.message)
-  end
-
-  def current_group_version group
-    TagGroupVersion.find_by(tag_group_id: group.id, version_no: group.version_no)
-  end
-
-  def group_version group, version_id
-    TagGroupVersion.find_by(tag_group_id: group.id, id: version_id)
-  end
-
-  def wiki_diff from_body, to_body
-    diffs = Diff::LCS.sdiff(from_body.to_s.lines, to_body.to_s.lines)
-    diffs.map { |change|
-      case change.action
-      when ?=
-        { type: 'context', content: change.old_element }
-      when ?!
-        [{ type: 'removed', content: change.old_element },
-         { type: 'added', content: change.new_element }]
-      when ?+
-        { type: 'added', content: change.new_element }
-      when ?-
-        { type: 'removed', content: change.old_element }
-      end
-    }.flatten.compact
-  end
-
-  def tag_group_changes versions
-    rows = versions.includes(:created_by_user).order(id: :desc).limit(200).to_a
-    groups = TagGroup.where(id: rows.map(&:tag_group_id).uniq).index_by(&:id)
-    predecessors = TagGroupVersion.where(tag_group_id: groups.keys,
-                                         version_no: rows.map { _1.version_no - 1 })
-        .pluck(:tag_group_id, :version_no, :id)
-        .to_h { |group_id, number, version_id| [[group_id, number], version_id] }
-    rows.map do |version|
-      group = groups.fetch(version.tag_group_id)
-      user = version.created_by_user
-      { revision_id: version.id,
-        pred: predecessors[[group.id, version.version_no - 1]],
-        succ: nil,
-        wiki_page: { id: group.id, title: "#{ TagGroupRepr::PREFIX }#{ version.name }",
-                     deprecated_at: nil },
-        user: user && { id: user.id, name: user.name },
-        kind: 'content', message: nil, timestamp: version.created_at }
-    end
-  end
-
   def render_wiki_page_or_404 page
     return head :not_found unless page
 
@@ -378,60 +204,6 @@ class WikiPagesController < ApplicationController
     render json: WikiPageRepr.base(page).merge(body:, revision_id:, pred:, succ:, updated_at:)
   end
 
-  def render_wiki_page_by_tag_description description
-    versions = description_versions(description)
-    historical = params[:version].present?
-    rev = historical ? versions.find_by(id: params[:version]) :
-        versions.find_by(version_no: description.version_no)
-    return head :not_found unless rev
-
-    pred = versions.find_by(version_no: rev.version_no - 1)&.id
-    succ = versions.find_by(version_no: rev.version_no + 1)&.id
-    body = historical ? rev.body : description.body
-    updated_at = historical ? rev.created_at : description.updated_at
-    render json: WikiPageRepr.tag_description(description).merge(
-        body:, revision_id: rev.id, pred:, succ:, updated_at:)
-  end
-
-  def description_versions description
-    TagDescriptionVersion.where(tag_id: description.tag_id,
-                                language_code: description.language_code)
-  end
-
-  def tag_description_by_title title
-    TagDescription.joins(tag: :tag_names)
-        .find_by(language_code: 'ja', tag_names: { language_code: 'ja', name: title })
-  end
-
-  def description_changes descriptions
-    versions = TagDescriptionVersion.where(language_code: 'ja',
-                                           tag_id: descriptions.select(:tag_id))
-        .order(id: :desc).limit(200).to_a
-    return [] if versions.empty?
-
-    by_tag = descriptions.where(tag_id: versions.map(&:tag_id))
-        .includes(tag: :tag_names).index_by(&:tag_id)
-    users = User.where(id: versions.map(&:created_by_user_id)).index_by(&:id)
-    predecessors = TagDescriptionVersion.where(
-        language_code: 'ja', tag_id: by_tag.keys,
-        version_no: versions.map { |version| version.version_no - 1 })
-        .pluck(:tag_id, :version_no, :id)
-        .to_h { |tag_id, version_no, id| [[tag_id, version_no], id] }
-    versions.map do |version|
-      description = by_tag.fetch(version.tag_id)
-      user = users[version.created_by_user_id]
-      { revision_id: version.id,
-        pred: predecessors[[version.tag_id, version.version_no - 1]],
-        succ: nil,
-        wiki_page: { id: description.id, title: description.tag.name('ja'),
-                     deprecated_at: description.tag.deprecated_at },
-        user: user && { id: user.id, name: user.name },
-        kind: 'content',
-        message: nil,
-        timestamp: version.created_at }
-    end
-  end
-
   def find_revision page
     if params[:version].present?
       page.wiki_revisions.find_by(id: params[:version])

backend/app/models/external_tag.rb

@@ -1,6 +1,4 @@
 class ExternalTag < ApplicationRecord
-  before_create { SharedResourceIdAllocator.assign!(self) }
-
   enum :platform, nico: 'nico'
   validates :platform, presence: true, inclusion: { in: ExternalTag.platforms.keys }
 

backend/app/models/tag.rb

@@ -2,8 +2,6 @@ require 'set'
 
 
 class Tag < ApplicationRecord
-  before_create { SharedResourceIdAllocator.assign!(self) }
-
   class NicoTagNormalisationError < ArgumentError
     ;
   end
@@ -53,7 +51,6 @@ class Tag < ApplicationRecord
   has_many :tag_versions
 
   has_many :tag_names
-  has_many :tag_descriptions
 
   attribute :version_no, :integer, default: 1
 
@@ -99,13 +96,7 @@ class Tag < ApplicationRecord
 
   def deprecated? = deprecated_at?
 
-  def has_description? language_code:
-    if tag_descriptions.loaded?
-      tag_descriptions.any? { _1.language_code == language_code }
-    else
-      tag_descriptions.exists?(language_code:)
-    end
-  end
+  def has_wiki = wiki_page.present?
 
   def material_id = materials.first&.id
 

backend/app/models/tag_description.rb

@@ -1,5 +0,0 @@
-class TagDescription < ApplicationRecord
-  before_create { SharedResourceIdAllocator.assign!(self) }
-
-  belongs_to :tag
-end

backend/app/models/tag_description_version.rb

@@ -1,3 +0,0 @@
-class TagDescriptionVersion < ApplicationRecord
-  ;
-end

backend/app/models/tag_group.rb

@@ -1,18 +0,0 @@
-class TagGroup < ApplicationRecord
-  before_create { SharedResourceIdAllocator.assign!(self) }
-
-  belongs_to :created_by_user, class_name: 'User', optional: true
-  belongs_to :updated_by_user, class_name: 'User', optional: true
-
-  has_many :tag_group_tags, dependent: :delete_all
-  has_many :tags, through: :tag_group_tags
-  has_many :tag_group_groups, dependent: :delete_all
-  has_many :child_tag_groups, through: :tag_group_groups
-  has_many :placements, -> { order(:position) },
-           class_name: 'TagGroupPlacement', dependent: :delete_all
-  has_many :versions, -> { order(:version_no) },
-           class_name: 'TagGroupVersion', dependent: :delete_all
-
-  validates :name, presence: true, uniqueness: true, length: { maximum: 255 }
-  validates :version_no, numericality: { only_integer: true, greater_than: 0 }
-end

backend/app/models/tag_group_group.rb

@@ -1,7 +0,0 @@
-class TagGroupGroup < ApplicationRecord
-  self.primary_key = [:tag_group_id, :child_tag_group_id]
-
-  belongs_to :tag_group
-  belongs_to :child_tag_group, class_name: 'TagGroup'
-  belongs_to :created_by_user, class_name: 'User', optional: true
-end

backend/app/models/tag_group_placement.rb

@@ -1,9 +0,0 @@
-class TagGroupPlacement < ApplicationRecord
-  self.primary_key = [:tag_group_id, :position]
-
-  belongs_to :tag_group
-  belongs_to :tag, optional: true
-  belongs_to :child_tag_group, class_name: 'TagGroup', optional: true
-  belongs_to :created_by_user, class_name: 'User', optional: true
-  belongs_to :updated_by_user, class_name: 'User', optional: true
-end

backend/app/models/tag_group_tag.rb

@@ -1,7 +0,0 @@
-class TagGroupTag < ApplicationRecord
-  self.primary_key = [:tag_group_id, :tag_id]
-
-  belongs_to :tag_group
-  belongs_to :tag
-  belongs_to :created_by_user, class_name: 'User', optional: true
-end

backend/app/models/tag_group_version.rb

@@ -1,7 +0,0 @@
-class TagGroupVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :tag_group
-
-  scope :ordered, -> { order(:version_no) }
-end

backend/app/models/wiki_page.rb

@@ -48,11 +48,8 @@ class WikiPage < ApplicationRecord
     page
   end
 
-  def pred_revision_id revision_id
-    wiki_revisions.where('id < ?', revision_id).order(id: :desc).limit(1).pick(:id)
-  end
-
-  def succ_revision_id revision_id
-    wiki_revisions.where('id > ?', revision_id).order(id: :asc).limit(1).pick(:id)
-  end
+  def pred_revision_id(revision_id) =
+      wiki_revisions.where('id < ?', revision_id).order(id: :desc).limit(1).pick(:id)
+  def succ_revision_id(revision_id) =
+      wiki_revisions.where('id > ?', revision_id).order(id: :asc).limit(1).pick(:id)
 end

backend/app/representations/tag_group_repr.rb

@@ -1,194 +0,0 @@
-module TagGroupRepr
-  PREFIX = 'タググループ:'
-
-  module_function
-
-  def many groups
-    ids = groups.map(&:id)
-    return [] if ids.empty?
-
-    tag_members = TagGroupTag.where(tag_group_id: ids)
-        .group_by(&:tag_group_id)
-    group_members = TagGroupGroup.where(tag_group_id: ids)
-        .group_by(&:tag_group_id)
-    placements = TagGroupPlacement.where(tag_group_id: ids).order(:position)
-        .group_by(&:tag_group_id)
-
-    target_ids = tag_members.values.flatten.map(&:tag_id) +
-        group_members.values.flatten.map(&:child_tag_group_id) +
-        placements.values.flatten.filter_map(&:tag_id)
-    child_ids = group_members.values.flatten.map(&:child_tag_group_id) +
-        placements.values.flatten.filter_map(&:child_tag_group_id)
-    tags = Tag.select(:id, :category).where(id: target_ids.uniq).index_by(&:id)
-    names = TagName.where(tag_id: target_ids.uniq, language_code: 'ja', primary_flg: true)
-        .pluck(:tag_id, :name).to_h
-    child_groups = TagGroup.where(id: child_ids.uniq).index_by(&:id)
-
-    groups.map do |group|
-      group_json(group,
-                 tag_members.fetch(group.id, []),
-                 group_members.fetch(group.id, []),
-                 placements.fetch(group.id, []), tags, names, child_groups)
-    end
-  end
-
-  def one group
-    many([group]).first
-  end
-
-  def tag_group wiki_page
-    { 'id' => wiki_page.id,
-      'title' => "#{ PREFIX }#{ wiki_page.name }",
-      'deprecated_at' => nil,
-      'created_at' => wiki_page.created_at,
-      'updated_at' => wiki_page.updated_at }
-  end
-
-  def current_version group
-    TagGroupVersion.find_by(tag_group_id: group.id, version_no: group.version_no)
-  end
-
-  def historical version
-    members = Array(version.members)
-    placements = Array(version.placements)
-    tag_references = members.filter_map { |member| member['tag_id'] } +
-        collect_ids(placements, 'tag_id')
-    group_references = members.filter_map { |member| member['tag_group_id'] } +
-        collect_ids(placements, 'tag_group_id')
-    tag_versions = historical_tag_versions(tag_references)
-    group_versions = historical_group_versions(group_references)
-    tag_version_numbers = members.filter_map do |member|
-      next unless member['tag_id']
-
-      [member.fetch('tag_id'), member.fetch('version_no')]
-    end.to_h
-    group_version_numbers = members.filter_map do |member|
-      next unless member['tag_group_id']
-
-      [member.fetch('tag_group_id'), member.fetch('version_no')]
-    end.to_h
-    historical_members = members.map do |member|
-      historical_member(member, tag_versions, group_versions)
-    end
-    historical_placements = placements.map do |node|
-      historical_placement(node, tag_versions, group_versions,
-                           tag_version_numbers, group_version_numbers)
-    end
-    { 'id' => version.tag_group_id,
-      'name' => version.name,
-      'description' => version.description,
-      'version_no' => version.version_no,
-      'members' => historical_members,
-      'placements' => historical_placements,
-      'created_at' => version.created_at,
-      'updated_at' => version.created_at,
-      'created_by_user' => user_json(version.created_by_user),
-      'updated_by_user' => user_json(version.created_by_user) }
-  end
-
-  def group_json group, tag_members, group_members, rows, tags, names, child_groups
-    tree = placement_tree(rows, tags, names, child_groups)
-    members = tag_members.sort_by(&:tag_id).map do |member|
-      { 'tag' => tag_json(tags.fetch(member.tag_id), names.fetch(member.tag_id)) }
-    end
-    members.concat(group_members.sort_by(&:child_tag_group_id).map do |member|
-      { 'tag_group' => group_json_reference(child_groups.fetch(member.child_tag_group_id)) }
-    end)
-    { 'id' => group.id,
-      'name' => group.name,
-      'description' => group.description,
-      'version_no' => group.version_no,
-      'members' => members,
-      'placements' => tree,
-      'created_at' => group.created_at,
-      'updated_at' => group.updated_at,
-      'created_by_user' => user_json(group.created_by_user),
-      'updated_by_user' => user_json(group.updated_by_user) }
-  end
-
-  def user_json user
-    UserRepr.base(user) if user
-  end
-
-  def placement_tree rows, tags, names, child_groups
-    by_parent = rows.group_by(&:parent_position)
-    build = lambda do |parent|
-      by_parent.fetch(parent, []).sort_by(&:position).map do |row|
-        node = if row.tag_id
-          { 'tag' => tag_json(tags.fetch(row.tag_id), names.fetch(row.tag_id)) }
-        elsif row.child_tag_group_id
-          { 'tag_group' => group_json_reference(child_groups.fetch(row.child_tag_group_id)) }
-        else
-          { 'section_name' => row.section_name, 'description' => row.description }
-        end
-        node.merge('children' => build.call(row.position))
-      end
-    end
-    build.call(nil)
-  end
-
-  def tag_json tag, name
-    { 'id' => tag.id, 'name' => name, 'category' => tag.category }
-  end
-
-  def group_json_reference group
-    { 'id' => group.id, 'name' => group.name }
-  end
-
-  def collect_ids nodes, key
-    nodes.flat_map do |node|
-      [node[key], *collect_ids(Array(node['children']), key)].compact
-    end
-  end
-
-  def historical_tag_versions ids
-    TagVersion.where(tag_id: ids.uniq).to_a.index_by do |version|
-      [version.tag_id, version.version_no]
-    end
-  end
-
-  def historical_group_versions ids
-    TagGroupVersion.where(tag_group_id: ids.uniq).to_a.index_by do |version|
-      [version.tag_group_id, version.version_no]
-    end
-  end
-
-  def historical_member member, tag_versions, group_versions
-    if member['tag_id']
-      id = member.fetch('tag_id')
-      version = tag_versions.fetch([id, member.fetch('version_no')])
-      { 'tag' => { 'id' => id, 'name' => japanese_version_name(version),
-                   'category' => version.category } }
-    else
-      id = member.fetch('tag_group_id')
-      version = group_versions.fetch([id, member.fetch('version_no')])
-      { 'tag_group' => { 'id' => id, 'name' => version.name } }
-    end
-  end
-
-  def historical_placement(node, tag_versions, group_versions,
-                           tag_version_numbers, group_version_numbers)
-    result = if node['tag_id']
-      id = node.fetch('tag_id')
-      version_no = tag_version_numbers.fetch(id)
-      version = tag_versions.fetch([id, version_no])
-      { 'tag' => { 'id' => id, 'name' => japanese_version_name(version),
-                   'category' => version.category } }
-    elsif node['tag_group_id']
-      id = node.fetch('tag_group_id')
-      version_no = group_version_numbers.fetch(id)
-      version = group_versions.fetch([id, version_no])
-      { 'tag_group' => { 'id' => id, 'name' => version.name } }
-    else
-      { 'section_name' => node.fetch('section_name'), 'description' => node['description'] }
-    end
-    result.merge('children' => Array(node['children']).map do |child|
-      historical_placement(child, tag_versions, group_versions,
-                           tag_version_numbers, group_version_numbers)
-    end)
-  end
-
-  def japanese_version_name version
-    version.names.fetch('ja').fetch('name')
-  end
-end

backend/app/representations/tag_repr.rb

@@ -3,28 +3,21 @@
 
 module TagRepr
   BASE = { only: [:id, :category, :post_count, :created_at, :updated_at, :deprecated_at],
-           methods: [:material_id, :has_deerjikists] }.freeze
+           methods: [:has_wiki, :material_id, :has_deerjikists] }.freeze
 
   module_function
 
   def base tag, language_code: 'ja'
-    tag.as_json(BASE).merge('has_wiki' => tag.has_description?(language_code:),
-                            name: name_for(tag, language_code),
+    tag.as_json(BASE).merge(name: name_for(tag, language_code),
                             aliases: tag.snapshot_aliases(language_code),
                             parents: tag.parents.map { inline(_1, language_code:) })
   end
 
   def inline tag, language_code: 'ja'
-    tag.as_json(BASE).merge('has_wiki' => tag.has_description?(language_code:),
-                            name: name_for(tag, language_code), aliases: [], parents: [])
+    tag.as_json(BASE).merge(name: name_for(tag, language_code), aliases: [], parents: [])
   end
 
-  def many tags, language_code: 'ja'
-    records = tags.to_a
-    ActiveRecord::Associations::Preloader.new(
-        records:, associations: [:tag_descriptions, { parents: :tag_descriptions }]).call
-    records.map { |tag| base(tag, language_code:) }
-  end
+  def many(tags, language_code: 'ja') = tags.map { |tag| base(tag, language_code:) }
 
   def name_for tag, language_code
     tag.name(language_code) || (tag.system? ? tag.name('ja') : nil)

backend/app/representations/wiki_page_repr.rb

@@ -10,26 +10,6 @@ module WikiPageRepr
     wiki_page.as_json(BASE)
   end
 
-  def tag_description description
-    tag = description.tag
-    { 'id' => description.id,
-      'resource_type' => 'tag_description',
-      'tag_name_id' => tag.tag_name('ja')&.id,
-      'body' => description.body,
-      'created_user_id' => description.created_by_user_id,
-      'updated_user_id' => description.updated_by_user_id,
-      'created_at' => description.created_at,
-      'updated_at' => description.updated_at,
-      'discarded_at' => nil,
-      'version_no' => description.version_no,
-      'title' => tag.name('ja'),
-      'deprecated_at' => tag.deprecated_at }
-  end
-
-  def tag_group tag_group
-    TagGroupRepr.tag_group(tag_group).merge('resource_type' => 'tag_group')
-  end
-
   def many wiki_pages
     wiki_pages.map { |p| base(p) }
   end

backend/app/services/shared_resource_id_allocator.rb

@@ -1,56 +0,0 @@
-require 'digest'
-
-
-class SharedResourceIdAllocator
-  SPACES = {
-      'tags' => ['tags', 'external_tags'],
-      'wiki' => ['tag_descriptions', 'tag_groups'] }.freeze
-  LOCK_TIMEOUT = 10
-
-  def self.assign! record
-    space, tables = SPACES.find { |_name, names| names.include?(record.class.table_name) }
-    raise ArgumentError, 'Unknown shared ID resource' unless tables
-
-    connection = record.class.connection
-    transaction = record.class.current_transaction
-    raise ActiveRecord::ActiveRecordError, 'Shared ID requires a transaction' unless transaction.open?
-
-    database = connection.pool.db_config.database
-    name = "btrc:ids:#{ Digest::SHA256.hexdigest(database)[0, 16] }:#{ space }"
-    quoted_name = connection.quote(name)
-    acquired = record.class.uncached do
-      connection.select_value("SELECT GET_LOCK(#{ quoted_name }, #{ LOCK_TIMEOUT })")
-    end
-    unless acquired.to_i == 1
-      raise ActiveRecord::LockWaitTimeout, "Shared ID lock unavailable: #{ space }"
-    end
-
-    release = lambda do
-      result = record.class.uncached do
-        connection.select_value("SELECT RELEASE_LOCK(#{ quoted_name })")
-      end
-      unless result.to_i == 1
-        raise ActiveRecord::ActiveRecordError, "Shared ID lock release failed: #{ space }"
-      end
-    end
-    begin
-      transaction.after_commit(&release)
-      transaction.after_rollback(&release)
-    rescue StandardError
-      release.call
-      raise
-    end
-
-    return if record.id.present?
-
-    # Locking reads see committed maxima even after earlier repeatable reads.
-    maxima = record.class.uncached do
-      tables.map do |table|
-        quoted_table = connection.quote_table_name(table)
-        connection.select_value(
-            "SELECT id FROM #{ quoted_table } ORDER BY id DESC LIMIT 1 FOR UPDATE").to_i
-      end
-    end
-    record.id = maxima.max + 1
-  end
-end

backend/app/services/tag_description_operation.rb

@@ -1,72 +0,0 @@
-class TagDescriptionOperation
-  LANGUAGE_CODE = 'ja'
-
-  def self.create!(tag:, body:, created_by_user:, message: nil)
-    ApplicationRecord.transaction do
-      tag.lock!
-      raise ActiveRecord::RecordNotUnique if TagDescription.exists?(
-          tag_id: tag.id, language_code: LANGUAGE_CODE)
-
-      page = Wiki::CompatibilityWriter.create!(
-          tag_name: compatibility_tag_name(tag), body:, created_by_user:, message:)
-      revision = page.wiki_revisions.order(id: :desc).first
-      record_version!(tag:, revision:, body: revision.body, user: created_by_user,
-                      description: nil)
-      page
-    end
-  end
-
-  def self.update!(tag:, body:, updated_by_user:, message: nil,
-                   base_revision_id: nil)
-    ApplicationRecord.transaction do
-      tag.lock!
-      description = TagDescription.lock.find_by!(
-          tag_id: tag.id, language_code: LANGUAGE_CODE)
-      tag_name = compatibility_tag_name(tag)
-      page = WikiPage.lock.find_by(tag_name_id: tag_name.id)
-      unless page
-        versions = TagDescriptionVersion.where(tag_id: tag.id, language_code: LANGUAGE_CODE)
-        if base_revision_id.present? && versions.maximum(:id) != base_revision_id.to_i
-          raise Wiki::Commit::Conflict, '競合が発生してゐます．'
-        end
-        page = Wiki::CompatibilityWriter.create!(
-            tag_name:, body:, created_by_user: updated_by_user, message:)
-        revision = page.current_revision
-        record_version!(tag:, revision:, body: revision.body,
-                        user: updated_by_user, description:)
-        next revision
-      end
-      revision = Wiki::CompatibilityWriter.update!(
-          page:, body:, updated_by_user:, message:,
-          base_revision_id:)
-      next unless revision
-
-      record_version!(tag:, revision:, body: revision.body,
-                      user: updated_by_user, description:)
-      revision
-    end
-  end
-
-  def self.compatibility_tag_name tag
-    tag.tag_name(LANGUAGE_CODE) || TagName.find_by!(id: tag.tag_name_id,
-                                                  language_code: LANGUAGE_CODE)
-  end
-
-  def self.record_version! tag:, revision:, body:, user:, description:
-    version_no = description ? description.version_no + 1 : 1
-    TagDescriptionVersion.create!(
-        id: revision.id, tag_id: tag.id, language_code: LANGUAGE_CODE,
-        version_no:, event_type: description ? 'update' : 'create', body:,
-        created_by_user_id: user.id, created_at: revision.created_at)
-    if description
-      description.update!(body:, version_no:, updated_by_user_id: user.id)
-    else
-      TagDescription.create!(
-          tag_id: tag.id,
-          language_code: LANGUAGE_CODE, version_no:, body:,
-          created_by_user_id: user.id, updated_by_user_id: user.id)
-    end
-  end
-
-  private_class_method :record_version!
-end

backend/app/services/tag_group_markdown_parser.rb

@@ -1,177 +0,0 @@
-require 'kramdown'
-
-class TagGroupMarkdownParser
-  PREFIX = TagGroupRepr::PREFIX
-
-  class InvalidDocument < StandardError
-    ;
-  end
-
-  def self.parse(body:, group: nil)
-    new(body:, group:).parse
-  end
-
-  def initialize(body:, group:)
-    @body = body.to_s.gsub(/\r\n?/, "\n")
-    @group = group
-  end
-
-  def parse
-    parse_body = @body.gsub(/([^\n])\n([\x23]{1,6}[ \t]+\S)/, "\\1\n\n\\2")
-    root = Kramdown::Document.new(parse_body, input: 'GFM', auto_ids: false).root
-    placements = []
-    description_parts = []
-    headings = []
-
-    root.children.each do |node|
-      case node.type
-      when :blank
-        next
-      when :header
-        level = node.options.fetch(:level)
-        name = inline_text(node).strip
-        invalid!('Section 名は必須です．') if name.blank?
-
-        headings.pop while headings.any? && headings.last.fetch(:level) >= level
-        parent = headings.last&.fetch(:node)
-        section = { 'section_name' => name, 'description' => nil,
-                    'children' => [] }
-        (parent ? parent.fetch('children') : placements) << section
-        headings << { level:, node: section }
-      when :p
-        text = inline_markdown(node).strip
-        next if text.empty?
-
-        if headings.any?
-          section = headings.last.fetch(:node)
-          section['description'] = [section['description'], text].compact.join("\n\n")
-        else
-          description_parts << text
-        end
-      when :ul
-        invalid!('未対応のリスト項目があります．') if node.attr.any?
-        target = headings.any? ? headings.last.fetch(:node).fetch('children') : placements
-        target.concat(node.children.map { parse_list_item(_1) })
-      else
-        invalid!("未対応の Markdown 構文 #{ node.type.inspect } です．")
-      end
-    end
-
-    description = description_parts.presence&.join("\n\n")
-    { description:, placements:, members: build_members(placements),
-      compatibility_body: @body.sub(/\n+\z/, '') }
-  rescue Kramdown::Error => error
-    invalid!("Markdown を解析できません：#{ error.message }")
-  end
-
-  private
-
-  def parse_list_item(item)
-    invalid!('リスト項目ではありません．') unless item.type == :li
-    invalid!('未対応のリスト項目があります．') if item.attr.any?
-
-    nested, own = item.children.partition { |child| child.type == :ul }
-    invalid!('順序付きリストは使用できません．') if own.any? { _1.type == :ol }
-    own.reject! { _1.type == :blank }
-    invalid!('未対応のリスト項目があります．') unless own.all? do |child|
-      [:p, :text].include?(child.type)
-    end
-    invalid!('リスト項目は一つの段落で指定してください．') if own.size != 1
-
-    label = own.map { inline_text(_1) }.join(' ').strip
-    invalid!('空のリスト項目は使用できません．') if label.blank?
-
-    node = if label.start_with?(PREFIX)
-      group_name = label.delete_prefix(PREFIX).strip
-      child_group = TagGroup.find_by(name: group_name)
-      invalid!("Tag Group #{ group_name.inspect } を解決できません．") unless child_group
-      invalid!('自分自身を含めることはできません．') if child_group.id == @group&.id
-      { 'tag_group_id' => child_group.id }
-    elsif label.end_with?(':', '：')
-      section_name = label.sub(/[:：]\z/, '').strip
-      invalid!('Section 名は必須です．') if section_name.blank?
-      { 'section_name' => section_name, 'description' => nil }
-    else
-      { 'tag_id' => resolve_tag(label) }
-    end
-
-    node['children'] = nested.flat_map do |list|
-      invalid!('未対応の入れ子リストです．') unless list.type == :ul
-      list.children.map { parse_list_item(_1) }
-    end
-    node
-  end
-
-  def resolve_tag(name)
-    names = TagName.where(language_code: 'ja', name:).to_a
-    tag_ids = names.filter_map(&:tag_id).uniq
-    invalid!("Tag #{ name.inspect } を解決できません．") if tag_ids.empty?
-    invalid!("Tag 名 #{ name.inspect } が曖昧です．") if tag_ids.many?
-
-    tag_ids.first
-  end
-
-  def build_members(nodes)
-    references = []
-    visit = lambda do |items|
-      items.each do |node|
-        references << node.slice('tag_id', 'tag_group_id') if
-            node.key?('tag_id') || node.key?('tag_group_id')
-        visit.call(node.fetch('children'))
-      end
-    end
-    visit.call(nodes)
-    references.uniq
-  end
-
-  def inline_text(node)
-    if node.attr.any?
-      invalid!("未対応のインライン構文 #{ node.type.inspect } です．")
-    end
-
-    case node.type
-    when :text
-      node.value.to_s
-    when :p, :header
-      node.children.map { inline_text(_1) }.join
-    else
-      invalid!("未対応のインライン構文 #{ node.type.inspect } です．")
-    end
-  end
-
-  def inline_markdown(node)
-    case node.type
-    when :text
-      node.value.to_s
-    when :codespan
-      text = node.value.to_s
-      longest = text.scan(/`+/).map(&:length).max || 0
-      delimiter = '`' * (longest + 1)
-      padded = text.start_with?('`', ' ') || text.end_with?('`', ' ')
-      content = padded ? " #{ text } " : text
-      "#{ delimiter }#{ content }#{ delimiter }"
-    when :softbreak
-      "\n"
-    when :br
-      "  \n"
-    when :p
-      node.children.map { inline_markdown(_1) }.join
-    when :a
-      href = node.attr.fetch('href')
-      label = node.children.map { inline_markdown(_1) }.join
-      title = node.attr['title']&.gsub('"', '\\"')
-      suffix = title ? " \"#{ title }\"" : ''
-      "[#{ label }](#{ href }#{ suffix })"
-    when :em
-      "*#{ node.children.map { inline_markdown(_1) }.join }*"
-    when :strong
-      "**#{ node.children.map { inline_markdown(_1) }.join }**"
-    else
-      invalid!("未対応の説明文構文 #{ node.type.inspect } です．")
-    end
-  end
-
-  def invalid! message
-    raise InvalidDocument, message
-  end
-end

backend/app/services/tag_group_markdown_renderer.rb

@@ -1,118 +0,0 @@
-class TagGroupMarkdownRenderer
-  class UnsupportedStructure < StandardError
-    ;
-  end
-
-  def self.render group
-    new(group).render
-  end
-
-  def initialize group
-    @group = group
-  end
-
-  def render
-    placements = @group.fetch('placements')
-    validate_membership!(placements)
-    blocks = []
-    if @group['description'].present?
-      blocks << clean_text(@group['description'])
-    end
-
-    sections = placements.select { _1.key?('section_name') }
-    if sections.any? && sections.size != placements.size
-      raise UnsupportedStructure,
-          '最上位の見出し Section と Placement の混在は Markdown にできません．'
-    end
-
-    if placements.all? { _1.key?('section_name') }
-      blocks.concat(placements.map { render_heading(_1, 2) })
-    else
-      blocks << render_list(placements, 0)
-    end
-
-    blocks.compact.reject(&:empty?).join("\n").sub(/\n+\z/, '')
-  end
-
-  private
-
-  def validate_membership! placements
-    placed = placement_members(placements).uniq.sort
-    members = @group.fetch('members').map { |member|
-      if member['tag']
-        ['tag', member.fetch('tag').fetch('id')]
-      else
-        ['tag_group', member.fetch('tag_group').fetch('id')]
-      end
-    }.uniq.sort
-    missing = members - placed
-    if missing.any?
-      raise UnsupportedStructure, '掲載位置のない membership は Markdown にできません．'
-    end
-  end
-
-  def placement_members nodes
-    nodes.flat_map do |node|
-      own = if node['tag']
-        [['tag', node.fetch('tag').fetch('id')]]
-      elsif node['tag_group']
-        [['tag_group', node.fetch('tag_group').fetch('id')]]
-      else
-        []
-      end
-      own + placement_members(node.fetch('children'))
-    end
-  end
-
-  def render_heading section, level
-    header = "#{ '#' * level } #{ clean_text(section.fetch('section_name')) }"
-    blocks = [header]
-    blocks << clean_text(section['description']) if section['description'].present?
-    children = section.fetch('children')
-    section_indexes = children.each_index.select { |index| children[index].key?('section_name') }
-    if section_indexes.any?
-      first_section = section_indexes.first
-      if children[first_section..].any? { !_1.key?('section_name') }
-        raise UnsupportedStructure,
-            '見出し Section と兄弟 Placement の交互配置は Markdown にできません．'
-      end
-      list_nodes = children[0...first_section]
-      blocks << render_list(list_nodes, 0) if list_nodes.any?
-      blocks.concat(children[first_section..].map { render_heading(_1, level + 1) })
-    elsif children.any?
-      blocks << render_list(children, 0)
-    end
-    blocks.join("\n")
-  end
-
-  def render_list nodes, depth
-    nodes.map do |node|
-      indent = '  ' * depth
-      if node.key?('section_name')
-        raise UnsupportedStructure,
-            'リスト内 Section の説明文は Markdown にできません．' if node['description'].present?
-
-        children = node.fetch('children')
-        head = "#{ indent }- #{ clean_text(node.fetch('section_name')) }:"
-        tail = render_list(children, depth + 1) if children.any?
-        [head, tail].compact.join("\n")
-      else
-        label = if node['tag']
-          node.fetch('tag').fetch('name')
-        else
-          "#{ TagGroupRepr::PREFIX }#{ node.fetch('tag_group').fetch('name') }"
-        end
-        raise UnsupportedStructure, '名称のない Placement は Markdown にできません．' if label.blank?
-
-        head = "#{ indent }- #{ clean_text(label) }"
-        children = node.fetch('children')
-        tail = render_list(children, depth + 1) if children.any?
-        [head, tail].compact.join("\n")
-      end
-    end.join("\n")
-  end
-
-  def clean_text value
-    value.to_s.gsub(/\r\n?/, "\n").lines.map(&:rstrip).join("\n").strip
-  end
-end

backend/app/services/tag_group_operation.rb

@@ -1,410 +0,0 @@
-class TagGroupOperation
-  MAX_PLACEMENT_DEPTH = 5
-  PREFIX = TagGroupRepr::PREFIX
-
-  def self.create!(name:, description:, members:, placements:, actor:,
-                   require_compatibility: false, compatibility_body: nil)
-    group, sync_issue = ApplicationRecord.transaction do
-      group = TagGroup.new(version_no: 1, created_by_user: actor,
-                           updated_by_user: actor)
-      attributes = prepare!(group:, name:, description:, members:, placements:)
-      group.assign_attributes(name: attributes.fetch(:name),
-                              description: attributes.fetch(:description))
-      group.save!
-      persist_structure!(group:, attributes:, actor:)
-      persist_version!(group:, attributes:, actor:, event_type: 'create')
-      issue = sync_compatibility!(group:, actor:, old_name: nil,
-                                  require_compatibility:, compatibility_body:)
-      [group, issue]
-    end
-    report_sync_issue(group, actor, sync_issue)
-    group
-  end
-
-  def self.update!(group:, name:, description:, members:, placements:, actor:,
-                   require_compatibility: false, compatibility_body: nil)
-    group, sync_issue = ApplicationRecord.transaction do
-      group.lock!
-      old_name = group.name
-      attributes = prepare!(group:, name:, description:, members:, placements:)
-      next [group, nil] if unchanged?(group, attributes)
-
-      group.update!(name: attributes.fetch(:name),
-                    description: attributes.fetch(:description),
-                    version_no: group.version_no + 1,
-                    updated_by_user: actor)
-      persist_structure!(group:, attributes:, actor:)
-      persist_version!(group:, attributes:, actor:, event_type: 'update')
-      issue = sync_compatibility!(group:, actor:, old_name:,
-                                  require_compatibility:, compatibility_body:)
-      [group, issue]
-    end
-    report_sync_issue(group, actor, sync_issue)
-    group
-  end
-
-  def self.prepare!(group:, name:, description:, members:, placements:)
-    record = group
-    normalized_name = name.to_s.strip
-    invalid!(record, :name, 'グループ名は必須です．') if normalized_name.blank?
-    if normalized_name.length > 255
-      invalid!(record, :name, 'グループ名は 255 文字以内で入力してください．')
-    end
-    invalid!(record, :description, '説明文は文字列で入力してください．') unless
-        description.nil? || description.is_a?(String)
-
-    record.name = normalized_name
-    record.description = description
-    unless record.valid?
-      raise ActiveRecord::RecordInvalid, record
-    end
-
-    member_rows = normalize_members(record, members)
-    placement_tree = normalize_placements(record, placements)
-    validate_references!(record, member_rows, placement_tree)
-    validate_containment!(record, member_rows)
-    { name: normalized_name, description:, members: member_rows,
-      placements: placement_tree }
-  end
-  private_class_method :prepare!
-
-  def self.unchanged?(group, attributes)
-    unless (group.name_in_database == attributes.fetch(:name) &&
-            group.description_in_database == attributes.fetch(:description))
-      return false
-    end
-
-    members = TagGroupTag.where(tag_group_id: group.id).pluck(:tag_id)
-        .map { { 'tag_id' => _1 } }
-    members.concat(TagGroupGroup.where(tag_group_id: group.id)
-        .pluck(:child_tag_group_id).map { { 'tag_group_id' => _1 } })
-    requested_members = attributes.fetch(:members).map do |member|
-      member.except('version_no')
-    end
-    return false unless members.to_set == requested_members.to_set
-
-    rows = TagGroupPlacement.where(tag_group_id: group.id).order(:position)
-        .group_by(&:parent_position)
-    build = lambda do |parent_position|
-      rows.fetch(parent_position, []).map do |row|
-        node = if row.tag_id
-          { 'tag_id' => row.tag_id }
-        elsif row.child_tag_group_id
-          { 'tag_group_id' => row.child_tag_group_id }
-        else
-          { 'section_name' => row.section_name, 'description' => row.description }
-        end
-        node.merge('children' => build.call(row.position))
-      end
-    end
-    build.call(nil) == comparable_placements(attributes.fetch(:placements))
-  end
-  private_class_method :unchanged?
-
-  def self.comparable_placements(nodes)
-    nodes.map do |node|
-      result = node.dup
-      result['description'] = node['description'] if node.key?('section_name')
-      result['children'] = comparable_placements(node.fetch('children'))
-      result
-    end
-  end
-  private_class_method :comparable_placements
-
-  def self.normalize_members(record, members)
-    invalid!(record, :members, 'members は配列で指定してください．') unless members.is_a?(Array)
-
-    result = members.map do |member|
-      member = stringify_keys(member)
-      unless member.is_a?(Hash) && member.keys.one? &&
-             (member.key?('tag_id') || member.key?('tag_group_id'))
-        invalid!(record, :members, '各 member は tag_id または tag_group_id を一つ指定してください．')
-      end
-      key = member.keys.first
-      id = integer_id(record, member.fetch(key), :members)
-      { key => id }
-    end
-    invalid!(record, :members, 'membership に重複があります．') unless result.uniq == result
-    result
-  end
-  private_class_method :normalize_members
-
-  def self.normalize_placements(record, placements)
-    invalid!(record, :placements, 'placements は配列で指定してください．') unless
-        placements.is_a?(Array)
-
-    normalize_placement_nodes(record, placements, 1)
-  end
-  private_class_method :normalize_placements
-
-  def self.normalize_placement_nodes(record, nodes, depth)
-    if depth > MAX_PLACEMENT_DEPTH && nodes.any?
-      invalid!(record, :placements, '配置の深さは 5 階層までです．')
-    end
-
-    nodes.map do |raw_node|
-      node = stringify_keys(raw_node)
-      unless node.is_a?(Hash) && node.key?('children')
-        invalid!(record, :placements, '各 Placement に children 配列が必要です．')
-      end
-      children = node.delete('children')
-      unless children.is_a?(Array)
-        invalid!(record, :placements, 'children は配列で指定してください．')
-      end
-
-      kinds = ['tag_id', 'tag_group_id', 'section_name'].select { node.key?(_1) }
-      invalid!(record, :placements, 'Placement の種類を一つ指定してください．') unless
-          kinds.one?
-      kind = kinds.first
-      allowed = [kind, 'description']
-      invalid!(record, :placements, '不明な Placement 項目があります．') unless
-          (node.keys - allowed).empty?
-
-      case kind
-      when 'tag_id', 'tag_group_id'
-        node[kind] = integer_id(record, node.fetch(kind), :placements)
-        if node['description'].present?
-          invalid!(record, :placements, 'Tag / Tag Group Placement に説明文は指定できません．')
-        end
-        node.delete('description')
-      when 'section_name'
-        section_name = node.fetch(kind)
-        unless section_name.is_a?(String) && section_name.strip.present? &&
-               section_name.length <= 255
-          invalid!(record, :placements, 'Section 名は 1〜255 文字で入力してください．')
-        end
-        node[kind] = section_name.strip
-        unless node['description'].nil? || node['description'].is_a?(String)
-          invalid!(record, :placements, 'Section の説明文は文字列で入力してください．')
-        end
-      end
-
-      node['children'] = normalize_placement_nodes(record, children, depth + 1)
-      node
-    end
-  end
-  private_class_method :normalize_placement_nodes
-
-  def self.validate_references!(record, members, placements)
-    membership = members.to_set
-    placed = placement_references(placements).uniq
-    missing = placed - membership.to_a
-    invalid!(record, :placements, 'Placement の対象は membership に含めてください．') if
-        missing.any?
-
-    tag_ids = members.filter_map { _1['tag_id'] }
-    group_ids = members.filter_map { _1['tag_group_id'] }
-    tags = Tag.where(id: tag_ids).index_by(&:id)
-    groups = TagGroup.where(id: group_ids).index_by(&:id)
-    invalid!(record, :members, '存在しない Tag が含まれています．') if
-        tags.size != tag_ids.uniq.size
-    invalid!(record, :members, '存在しない Tag Group が含まれています．') if
-        groups.size != group_ids.uniq.size
-
-    tag_versions = TagVersion.where(tag_id: tag_ids).pluck(:tag_id, :version_no).to_set
-    group_versions = TagGroupVersion.where(tag_group_id: group_ids)
-        .pluck(:tag_group_id, :version_no).to_set
-    tag_names = TagName.where(tag_id: tag_ids, language_code: 'ja', primary_flg: true)
-        .pluck(:tag_id).uniq
-
-    members.each do |member|
-      if member.key?('tag_id')
-        id = member.fetch('tag_id')
-        invalid!(record, :members, "Tag ##{ id } に日本語の正規名がありません．") unless
-            tag_names.include?(id)
-        version_no = tags.fetch(id).version_no
-        unless tag_versions.include?([id, version_no])
-          invalid!(record, :members, "Tag ##{ id } の Version がありません．")
-        end
-        member['version_no'] = version_no
-      else
-        id = member.fetch('tag_group_id')
-        version_no = groups.fetch(id).version_no
-        unless group_versions.include?([id, version_no])
-          invalid!(record, :members, "Tag Group ##{ id } の Version がありません．")
-        end
-        member['version_no'] = version_no
-      end
-    end
-  end
-  private_class_method :validate_references!
-
-  def self.validate_containment!(record, members)
-    target_id = record.id
-    return unless target_id
-
-    children = members.filter_map { _1['tag_group_id'] }
-    edges = TagGroupGroup.pluck(:tag_group_id, :child_tag_group_id)
-        .group_by(&:first).transform_values { _1.map(&:last) }
-    edges[target_id] = children
-    visiting = Set.new
-    visited = Set.new
-    visit = lambda do |group_id|
-      invalid!(record, :members, 'Tag Group の循環包含はできません．') if
-          group_id == target_id && visiting.include?(group_id)
-      return if visited.include?(group_id)
-
-      visiting.add(group_id)
-      edges.fetch(group_id, []).each do |child_id|
-        invalid!(record, :members, 'Tag Group の循環包含はできません．') if
-            child_id == target_id
-        visit.call(child_id)
-      end
-      visiting.delete(group_id)
-      visited.add(group_id)
-    end
-    children.each { visit.call(_1) }
-  end
-  private_class_method :validate_containment!
-
-  def self.persist_structure!(group:, attributes:, actor:)
-    tag_members = TagGroupTag.where(tag_group_id: group.id).index_by(&:tag_id)
-    group_members = TagGroupGroup.where(tag_group_id: group.id).index_by(&:child_tag_group_id)
-    attributes.fetch(:members).each do |member|
-      if member.key?('tag_id')
-        next if tag_members.delete(member.fetch('tag_id'))
-
-        TagGroupTag.create!(tag_group_id: group.id, tag_id: member.fetch('tag_id'),
-                            created_by_user: actor)
-      else
-        next if group_members.delete(member.fetch('tag_group_id'))
-
-        TagGroupGroup.create!(tag_group_id: group.id,
-                              child_tag_group_id: member.fetch('tag_group_id'),
-                              created_by_user: actor)
-      end
-    end
-    existing = TagGroupPlacement.where(tag_group_id: group.id).index_by(&:position)
-    persist_placements!(group:, nodes: attributes.fetch(:placements), actor:, existing:)
-    existing.values.sort_by(&:position).reverse_each(&:delete)
-    tag_members.each_value(&:delete)
-    group_members.each_value(&:delete)
-  end
-  private_class_method :persist_structure!
-
-  def self.persist_placements!(group:, nodes:, actor:, existing:, parent_position: nil,
-                               next_position: [0])
-    nodes.each do |node|
-      next_position[0] += 1
-      position = next_position[0]
-      row = existing.delete(position) || TagGroupPlacement.new(
-          tag_group_id: group.id, position:, created_by_user: actor)
-      row.assign_attributes(
-          parent_position:,
-          section_name: node['section_name'], description: node['description'],
-          tag_id: node['tag_id'], child_tag_group_id: node['tag_group_id'])
-      if row.new_record? || row.changed?
-        row.updated_by_user = actor
-        row.save!
-      end
-      persist_placements!(group:, nodes: node.fetch('children'), actor:, existing:,
-                          parent_position: position, next_position:)
-    end
-  end
-  private_class_method :persist_placements!
-
-  def self.persist_version!(group:, attributes:, actor:, event_type:)
-    TagGroupVersion.create!(tag_group: group, version_no: group.version_no,
-                            event_type:, name: group.name,
-                            description: group.description,
-                            members: attributes.fetch(:members),
-                            placements: attributes.fetch(:placements),
-                            created_by_user: actor)
-  end
-  private_class_method :persist_version!
-
-  def self.sync_compatibility!(group:, actor:, old_name:,
-                               require_compatibility:, compatibility_body:)
-    representation = TagGroupRepr.one(group)
-    body = begin
-      TagGroupMarkdownRenderer.render(representation)
-    rescue TagGroupMarkdownRenderer::UnsupportedStructure => error
-      if compatibility_body.present?
-        compatibility_body
-      elsif require_compatibility
-        invalid!(group, :base, error.message)
-      else
-        return error.message
-      end
-    end
-    invalid!(group, :base, '本文は必須です．') if body.blank?
-
-    title = "#{ PREFIX }#{ group.name }"
-    old_title = old_name && "#{ PREFIX }#{ old_name }"
-    page = if old_title
-      WikiPage.joins(:tag_name).find_by(tag_names: { name: old_title })
-    else
-      nil
-    end
-    page ||= WikiPage.joins(:tag_name).find_by(tag_names: { name: title })
-
-    if page
-      tag_name = page.tag_name
-      tag_name.update!(name: title) if tag_name.name != title
-      Wiki::Commit.legacy_content!(page:, body:, created_user: actor, message: nil,
-                                   base_revision_id: nil)
-    else
-      tag_name = TagName.find_or_initialize_by(language_code: 'ja', name: title)
-      tag_name.script_code = 'Jpan'
-      tag_name.primary_flg = true
-      tag_name.auto_generated = false
-      tag_name.save!
-      Wiki::CompatibilityWriter.create!(tag_name:, body:, created_by_user: actor)
-    end
-    nil
-  end
-  private_class_method :sync_compatibility!
-
-  def self.report_sync_issue(group, actor, reason)
-    return unless reason
-
-    payload = { status: 'unsupported_structure', tag_group_id: group.id,
-                version_no: group.version_no, user_id: actor&.id, reason: }
-    Rails.logger.warn("tag_group_wiki_sync_skipped #{ payload.to_json }")
-  end
-  private_class_method :report_sync_issue
-
-  def self.placement_references(nodes)
-    nodes.flat_map do |node|
-      own = if node.key?('tag_id')
-        [{ 'tag_id' => node.fetch('tag_id') }]
-      elsif node.key?('tag_group_id')
-        [{ 'tag_group_id' => node.fetch('tag_group_id') }]
-      else
-        []
-      end
-      own + placement_references(node.fetch('children'))
-    end
-  end
-  private_class_method :placement_references
-
-  def self.stringify_keys(value)
-    case value
-    when ActionController::Parameters
-      value.to_unsafe_h.deep_stringify_keys
-    when Hash
-      value.deep_stringify_keys
-    else
-      value
-    end
-  end
-  private_class_method :stringify_keys
-
-  def self.integer_id(record, value, attribute)
-    integer = if value.is_a?(Integer)
-      value
-    elsif value.is_a?(String) && value.match?(/\A[0-9]+\z/)
-      value.to_i
-    end
-    invalid!(record, attribute, 'ID は正の整数で指定してください．') unless integer
-    invalid!(record, attribute, 'ID は正の整数で指定してください．') unless integer.positive?
-    integer
-  end
-  private_class_method :integer_id
-
-  def self.invalid!(record, attribute, message)
-    record.errors.add(attribute, message)
-    raise ActiveRecord::RecordInvalid, record
-  end
-  private_class_method :invalid!
-end

backend/app/services/wiki/commit.rb

@@ -8,16 +8,6 @@ module Wiki
     end
 
     def self.create_content! tag_name:, body:, created_by_user:, message: nil
-      if tag_name.tag && tag_name.language_code == 'ja' && !tag_name.name.include?(':')
-        return TagDescriptionOperation.create!(
-            tag: tag_name.tag, body:, created_by_user:, message:)
-      end
-
-      tag_name.errors.add(:base, :invalid)
-      raise ActiveRecord::RecordInvalid, tag_name
-    end
-
-    def self.create_legacy_content! tag_name:, body:, created_by_user:, message: nil
       normalised = normalise_body(body)
 
       page = WikiPage.new(tag_name:,
@@ -43,21 +33,6 @@ module Wiki
     end
 
     def self.content! page:, body:, created_user:, message: nil, base_revision_id: nil
-      description = TagDescription.find_by(tag_id: page.tag_name.tag_id, language_code: 'ja')
-      description ||= TagDescription.joins(:tag).find_by(
-          tags: { tag_name_id: page.tag_name_id }, language_code: 'ja')
-      if description && !page.title.include?(':')
-        return TagDescriptionOperation.update!(
-            tag: description.tag, body:, updated_by_user: created_user,
-            message:, base_revision_id:)
-      end
-
-      page.errors.add(:base, :invalid)
-      raise ActiveRecord::RecordInvalid, page
-    end
-
-    def self.legacy_content! page:, body:, created_user:, message: nil,
-                             base_revision_id: nil
       new(page:, created_user:).content!(body:, message:, base_revision_id:)
     end
 
@@ -82,6 +57,9 @@ module Wiki
       line_shas = lines.map { |line| Digest::SHA256.hexdigest(line) }
       tree_sha = Digest::SHA256.hexdigest(line_shas.join(','))
 
+      line_id_by_sha = upsert_lines!(lines, line_shas)
+      line_ids = line_shas.map { |sha| line_id_by_sha.fetch(sha) }
+
       ActiveRecord::Base.transaction do
         @page.lock!
 
@@ -94,8 +72,6 @@ module Wiki
           end
         end
 
-        line_id_by_sha = upsert_lines!(lines, line_shas)
-        line_ids = line_shas.map { |sha| line_id_by_sha.fetch(sha) }
         @page.update!(body: normalised)
 
         WikiVersionRecorder.record!(
@@ -118,6 +94,7 @@ module Wiki
           { wiki_revision_id: rev.id, wiki_line_id: line_id, position: pos }
         end
         WikiRevisionLine.insert_all!(rows) if rows.any?
+
         rev
       end
     end

backend/app/services/wiki/compatibility_writer.rb

@@ -1,43 +0,0 @@
-module Wiki
-  class CompatibilityWriter
-    def self.create! tag_name:, body:, created_by_user:, message: nil
-      ApplicationRecord.transaction do
-        tag_name.lock!
-        page = WikiPage.lock.find_by(tag_name_id: tag_name.id)
-        if page
-          update!(page:, body:, updated_by_user: created_by_user, message:)
-          page
-        else
-          Commit.create_legacy_content!(tag_name:, body:, created_by_user:, message:)
-        end
-      end
-    end
-
-    def self.update! page:, body:, updated_by_user:, message: nil,
-                     base_revision_id: nil
-      normalised = Commit.normalise_body(body)
-      if normalised.blank?
-        return Commit.legacy_content!(
-            page:, body: normalised, created_user: updated_by_user, message:,
-            base_revision_id:)
-      end
-
-      if base_revision_id.present?
-        current_id = page.wiki_revisions.maximum(:id)
-        if current_id && current_id != base_revision_id.to_i
-          raise Commit::Conflict,
-              "競合が発生してゐます" +
-              "（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
-        end
-      end
-
-      if Commit.normalise_body(page.body) == normalised && page.wiki_revisions.exists?
-        return
-      end
-
-      Commit.legacy_content!(
-          page:, body: normalised, created_user: updated_by_user, message:,
-          base_revision_id:)
-    end
-  end
-end

backend/config/routes.rb

@@ -1,6 +1,4 @@
 Rails.application.routes.draw do
-  resources :tag_groups, only: [:index, :show, :create, :update]
-
   resources :nico_tags, path: 'tags/nico', only: [:index, :show, :update]
 
   scope 'tags/:parent_id/children', controller: :tag_children do
@@ -16,7 +14,6 @@ Rails.application.routes.draw do
 
       scope :name do
         get ':name/deerjikists', action: :deerjikists_by_name
-        get ':name/description', to: 'tag_descriptions#show_by_title'
         get ':name/materials', action: :materials_by_name
         get ':name', action: :show_by_name
       end
@@ -28,9 +25,6 @@ Rails.application.routes.draw do
 
       get :deerjikists
       put :deerjikists, action: :update_deerjikists
-
-      get :description, to: 'tag_descriptions#show'
-      put :description, to: 'tag_descriptions#update'
     end
   end
 
@@ -41,7 +35,7 @@ Rails.application.routes.draw do
 
   resources :wiki_pages, path: 'wiki', only: [:index, :show, :create, :update] do
     collection do
-      get :search, action: :index
+      get :search
       get :changes
 
       scope :title do

backend/db/migrate/20261003000000_create_tag_descriptions.rb

@@ -1,63 +0,0 @@
-class CreateTagDescriptions < ActiveRecord::Migration[8.0]
-  def change
-    create_table :tag_description_versions do |t|
-      t.references :tag, null: false, foreign_key: false
-      t.string :language_code, limit: 16, null: false
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.text :body, null: false
-      t.string :source_language_code, limit: 16
-      t.integer :source_version_no
-      t.references :created_by_user
-      t.datetime :created_at, null: false
-
-      t.index [:tag_id, :language_code, :version_no], unique: true
-      t.foreign_key :tag_description_versions,
-                    column: [:tag_id, :source_language_code, :source_version_no],
-                    primary_key: [:tag_id, :language_code, :version_no]
-
-      t.check_constraint 'version_no > 0',
-                         name: 'chk_tag_description_versions_version_no_positive'
-
-      t.check_constraint "event_type IN ('create', 'update', 'discard', 'restore')",
-                         name: 'tag_description_versions_event_type_valid'
-
-      t.check_constraint ('(source_language_code IS NULL AND source_version_no IS NULL) OR ' +
-                          '(source_language_code IS NOT NULL AND source_version_no IS NOT NULL)'),
-                         name: 'chk_tag_description_versions_source_pair'
-
-      t.check_constraint 'source_language_code IS NULL OR source_language_code <> language_code',
-                         name: 'chk_tag_description_versions_source_language_code_different'
-    end
-
-    create_table :tag_descriptions do |t|
-      t.references :tag, null: false, foreign_key: true
-      t.string :language_code, limit: 16, null: false, index: true
-      t.integer :version_no, null: false
-      t.text :body, null: false
-      t.string :source_language_code, limit: 16
-      t.integer :source_version_no
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.references :updated_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.foreign_key :languages, column: :language_code, primary_key: :code
-      t.foreign_key :tag_description_versions,
-                    column: [:tag_id, :source_language_code, :source_version_no],
-                    primary_key: [:tag_id, :language_code, :version_no]
-
-      t.index [:tag_id, :language_code], unique: true
-      t.index [:source_language_code, :source_version_no]
-
-      t.check_constraint 'version_no > 0',
-                         name: 'chk_tag_descriptions_version_no_positive'
-
-      t.check_constraint ('(source_language_code IS NULL AND source_version_no IS NULL) OR ' +
-                          '(source_language_code IS NOT NULL AND source_version_no IS NOT NULL)'),
-                         name: 'chk_tag_descriptions_source_pair'
-
-      t.check_constraint 'source_language_code IS NULL OR source_language_code <> language_code',
-                         name: 'chk_tag_descriptions_source_language_code_different'
-    end
-  end
-end

backend/db/migrate/20261003010000_migrate_tag_descriptions_from_wiki_pages.rb

@@ -1,104 +0,0 @@
-class MigrateTagDescriptionsFromWikiPages < ActiveRecord::Migration[8.0]
-  class WikiPage < ActiveRecord::Base
-    self.table_name = 'wiki_pages'
-  end
-
-  class WikiRevision < ActiveRecord::Base
-    self.table_name = 'wiki_revisions'
-  end
-
-  class WikiRevisionLine < ActiveRecord::Base
-    self.table_name = 'wiki_revision_lines'
-  end
-
-  class TagName < ActiveRecord::Base
-    self.table_name = 'tag_names'
-  end
-
-  class TagDescription < ActiveRecord::Base
-    self.table_name = 'tag_descriptions'
-  end
-
-  class TagDescriptionVersion < ActiveRecord::Base
-    self.table_name = 'tag_description_versions'
-  end
-
-  def up
-    WikiPage.find_each do |page|
-      tag_name = TagName.find_by(id: page.tag_name_id, language_code: 'ja')
-      next unless tag_name&.tag_id
-
-      revisions = WikiRevision.where(wiki_page_id: page.id).order(:id).to_a
-
-      revisions.each_with_index do |revision, index|
-        version_no = index + 1
-
-        tag_id = tag_name[:tag_id]
-
-        unless tag_id
-          raise (
-              'tag_id is nil: ' +
-              "wiki_page_id=#{ page.id }, " +
-              "tag_name_id=#{ tag_name.id }, " +
-              "tag_name=#{ tag_name.attributes.inspect}")
-        end
-
-        revision_id = revision.id
-
-        say (
-            "wiki_page_id=#{ page.id }, " +
-            "tag_name_id=#{ tag_name.id }, " +
-            "tag_id=#{ tag_id }, " +
-            "revision_id=#{ revision_id }")
-
-        version = TagDescriptionVersion.new(
-            id: revision_id,
-            tag_id:,
-            language_code: 'ja',
-            version_no:,
-            event_type: version_no == 1 ? 'create' : 'update',
-            body: revision_body(revision_id),
-            source_language_code: nil,
-            source_version_no: nil,
-            created_by_user_id: revision.created_user_id,
-            created_at: revision.created_at)
-
-        say version.attributes.inspect
-
-        version.save!
-      end
-
-      next if page.discarded_at.present?
-      next if revisions.empty?
-
-      TagDescription.create!(
-          id: page.id,
-          tag_id: tag_name.tag_id,
-          language_code: 'ja',
-          version_no: revisions.length,
-          body: page.body,
-          source_language_code: nil,
-          source_version_no: nil,
-          created_by_user_id: page.created_user_id,
-          updated_by_user_id: page.updated_user_id,
-          created_at: page.created_at,
-          updated_at: page.updated_at)
-    end
-  end
-
-  def down
-    raise ActiveRecord::IrreversibleMigration, '戻せません．'
-  end
-
-  private
-
-  def revision_body revision_id
-    WikiRevisionLine
-        .joins('INNER JOIN wiki_lines ' +
-               'ON wiki_lines.id = wiki_revision_lines.wiki_line_id')
-        .where(wiki_revision_id: revision_id)
-        .order(:position)
-        .pluck('wiki_lines.body')
-        .join("\n")
-  end
-end

backend/db/migrate/20261005000000_repair_wiki_updated_at.rb

@@ -1,53 +0,0 @@
-class RepairWikiUpdatedAt < ActiveRecord::Migration[8.0]
-  class WikiPage < ActiveRecord::Base
-    self.table_name = 'wiki_pages'
-  end
-
-  class WikiVersion < ActiveRecord::Base
-    self.table_name = 'wiki_versions'
-  end
-
-  class TagDescription < ActiveRecord::Base
-    self.table_name = 'tag_descriptions'
-  end
-
-  class TagDescriptionVersion < ActiveRecord::Base
-    self.table_name = 'tag_description_versions'
-  end
-
-  def up
-    say_with_time 'Repairing wiki_pages.updated_at from wiki_versions' do
-      WikiPage.find_each do |page|
-        version =
-            WikiVersion
-            .where(wiki_page_id: page.id)
-            .order(version_no: :desc)
-            .first
-
-        next unless version
-
-        page.update_columns(updated_at: version.created_at)
-      end
-    end
-
-    say_with_time 'Repairing tag_descriptions.updated_at from tag_description_versions' do
-      TagDescription.find_each do |description|
-        version =
-            TagDescriptionVersion
-            .where(
-                tag_id: description.tag_id,
-                language_code: description.language_code)
-            .order(version_no: :desc)
-            .first
-
-        next unless version
-
-        description.update_columns(updated_at: version.created_at)
-      end
-    end
-  end
-
-  def down
-    ;
-  end
-end

backend/db/migrate/20261008000000_create_tag_groups.rb

@@ -1,149 +0,0 @@
-class CreateTagGroups < ActiveRecord::Migration[8.0]
-  def change
-    # 翻訳系は上流の Translation リソースが未完のため保留
-
-    create_table :tag_groups do |t|
-      t.integer :version_no, null: false
-      t.string :name, limit: 255, null: false
-      t.text :description
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.references :updated_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.check_constraint 'version_no > 0', name: 'chk_tag_groups_version_no_positive'
-      t.index :name, unique: true
-    end
-
-    create_table :tag_group_tags, primary_key: [:tag_group_id, :tag_id] do |t|
-      t.references :tag_group, null: false, foreign_key: true, index: false
-      t.references :tag, null: false, foreign_key: true
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.datetime :created_at, null: false
-    end
-
-    create_table :tag_group_groups, primary_key: [:tag_group_id, :child_tag_group_id] do |t|
-      t.references :tag_group, null: false, foreign_key: true, index: false
-      t.references :child_tag_group,
-                   null: false, foreign_key: { to_table: :tag_groups }
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.datetime :created_at, null: false
-
-      t.check_constraint 'tag_group_id <> child_tag_group_id',
-                         name: 'chk_tag_group_groups_tag_group_id_not_child_tag_group_id'
-    end
-
-    create_table :tag_group_placements, primary_key: [:tag_group_id, :position] do |t|
-      t.references :tag_group, null: false, foreign_key: true, index: false
-      t.integer :position, null: false
-      t.integer :parent_position
-      t.string :section_name, limit: 255
-      t.text :description
-      t.references :tag
-      t.references :child_tag_group
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.references :updated_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.foreign_key :tag_group_placements,
-                    column: [:tag_group_id, :parent_position],
-                    primary_key: [:tag_group_id, :position]
-
-      t.foreign_key :tag_group_tags,
-                    column: [:tag_group_id, :tag_id],
-                    primary_key: [:tag_group_id, :tag_id]
-
-      t.foreign_key :tag_group_groups,
-                    column: [:tag_group_id, :child_tag_group_id],
-                    primary_key: [:tag_group_id, :child_tag_group_id]
-
-      t.check_constraint 'position > parent_position',
-                         name: 'chk_tag_group_placements_position_gt_parent_position'
-
-      t.check_constraint ('((section_name IS NOT NULL AND tag_id IS NULL AND child_tag_group_id IS NULL) OR ' +
-                          '(section_name IS NULL AND tag_id IS NOT NULL AND child_tag_group_id IS NULL) OR ' +
-                          '(section_name IS NULL AND tag_id IS NULL AND child_tag_group_id IS NOT NULL)) AND ' +
-                          '(section_name IS NOT NULL OR description IS NULL)'),
-                         name: 'chk_tag_group_placements_references_exclusive'
-    end
-
-    create_table :tag_group_versions do |t|
-      t.references :tag_group, null: false
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :name, limit: 255, null: false
-      t.text :description
-      t.json :members, null: false
-      t.json :placements, null: false
-      t.references :created_by_user
-      t.datetime :created_at, null: false
-
-      t.check_constraint 'version_no > 0',
-                         name: 'chk_tag_group_versions_version_no_positive'
-      t.index [:tag_group_id, :version_no], unique: true
-
-      add_members_constraint!(t)
-      add_placements_constraint!(t)
-    end
-  end
-
-  private
-
-  def add_members_constraint! t
-    schema = { type: 'array',
-               uniqueItems: true,
-               items: member_schema }
-
-    quoted_schema = connection.quote(JSON.generate(schema))
-
-    t.check_constraint "JSON_SCHEMA_VALID(#{ quoted_schema }, members)", 
-                       name: 'chk_tag_group_versions_members_schema'
-  end
-
-  def member_schema
-    { oneOf: [tag_member_schema, group_member_schema] }
-  end
-
-  def tag_member_schema
-    { type: 'object',
-      required: ['tag_id', 'version_no'],
-      properties: { tag_id: { type: 'integer', minimum: 1 },
-                    version_no: { type: 'integer', minimum: 1 } },
-      additionalProperties: false }
-  end
-
-  def group_member_schema
-    { type: 'object',
-      required: ['tag_group_id', 'version_no'],
-      properties: { tag_group_id: { type: 'integer', minimum: 1 },
-                    version_no: { type: 'integer', minimum: 1 } },
-      additionalProperties: false }
-  end
-
-  def add_placements_constraint! t
-    schema = { type: 'array', items: placement_schema(5) }
-
-    quoted_schema = connection.quote(JSON.generate(schema))
-
-    t.check_constraint "JSON_SCHEMA_VALID(#{ quoted_schema }, placements)",
-                       name: 'chk_tag_group_versions_placements_schema'
-  end
-
-  def placement_schema rest
-    { type: 'object',
-      required: ['children'],
-      properties: { section_name: { type: 'string' },
-                    description: { type: ['string', 'null'] },
-                    tag_id: { type: 'integer', minimum: 1 },
-                    tag_group_id: { type: 'integer', minimum: 1 },
-                    children: if rest > 1
-                                { type: 'array', items: placement_schema(rest - 1) }
-                              else
-                                { type: 'array', maxItems: 0 }
-                              end },
-      oneOf: [{ required: ['section_name'] },
-              { required: ['tag_id'] },
-              { required: ['tag_group_id'] }],
-      dependencies: { description: ['section_name'] },
-      additionalProperties: false }
-  end
-end

backend/db/migrate/20261008010000_migrate_tag_groups_from_wiki_pages.rb

@@ -1,518 +0,0 @@
-class MigrateTagGroupsFromWikiPages < ActiveRecord::Migration[8.0]
-  PREFIX = 'タググループ:'
-
-  def up
-    require 'json'
-    require 'time'
-    require 'kramdown'
-    require 'kramdown-parser-gfm'
-
-    assert_empty_destination!
-
-    pages = connection.select_all(<<~SQL).to_a
-      SELECT
-        wp.id
-      , wp.created_user_id
-      , wp.updated_user_id
-      , wp.created_at
-      , wp.updated_at
-      , wp.discarded_at
-      , tn.name
-      FROM
-        wiki_pages wp
-        INNER JOIN
-          tag_names tn
-          ON
-            tn.id = wp.tag_name_id
-      WHERE
-        tn.language_code = 'ja'
-        AND tn.name LIKE #{ quote("#{ PREFIX }%") }
-      ORDER BY
-        wp.id
-    SQL
-
-    return if pages.empty?
-
-    pages.each do |page|
-      if page['discarded_at']
-        say "Wiki ##{ page.fetch('id') }: 破棄済みですが，Revision の移行を継続します．"
-      end
-    end
-
-    tag_ids = load_tag_ids
-    page_ids = pages.map { |page| page.fetch('id').to_i }
-
-    revisions = connection.select_all(<<~SQL).to_a
-      SELECT
-        wr.id
-      , wr.wiki_page_id
-      , wr.kind
-      , wr.redirect_page_id
-      , wr.created_user_id
-      , wr.created_at
-      FROM
-        wiki_revisions wr
-      WHERE
-        wr.wiki_page_id IN (#{ page_ids.join(', ') })
-      ORDER BY
-        wr.wiki_page_id
-      , wr.id
-    SQL
-
-    revisions_by_page = revisions.group_by { |row| row.fetch('wiki_page_id').to_i }
-
-    pages = pages.select do |page|
-      page_id = page.fetch('id').to_i
-      if revisions_by_page.fetch(page_id, []).empty?
-        # tag_groups.version_no > 0 のため，Revision 0 件の Wiki は作成しない．
-        say "Wiki ##{ page_id }: Revision が 0 件のため移行対象から除外します．"
-        false
-      else
-        true
-      end
-    end
-
-    return if pages.empty?
-
-    group_ids = pages.to_h { |page| [page.fetch('name'), page.fetch('id').to_i] }
-    revision_history = pages.to_h do |page|
-      page_id = page.fetch('id').to_i
-      history = revisions_by_page.fetch(page_id).each_with_index.map do |revision, index|
-        { 'id' => revision.fetch('id').to_i,
-          'version_no' => index + 1,
-          'created_at' => revision.fetch('created_at') }
-      end
-      [page_id, history]
-    end
-
-    tag_history = connection.select_all(<<~SQL).to_a.group_by { |row| row.fetch('tag_id').to_i }
-      SELECT
-        tag_id
-      , version_no
-      , created_at
-      FROM
-        tag_versions
-      ORDER BY
-        tag_id
-      , created_at
-      , version_no
-    SQL
-
-    prepared = { }
-    pages.each do |page|
-      page_id = page.fetch('id').to_i
-      history = revisions_by_page.fetch(page_id)
-
-      prepared[page_id] = history.each_with_index.map do |revision, index|
-        context = "Wiki ##{ page_id } / Revision ##{ revision.fetch('id') }"
-        body = revision_body(revision.fetch('id').to_i)
-
-        if revision.fetch('kind').to_i == 1
-          destination = revision['redirect_page_id']
-          description = "旧 Wiki のリダイレクト先: Wiki ##{ destination }"
-          placements = []
-          members = []
-          say "#{ context }: リダイレクトを説明文として移行します．"
-        else
-          begin
-            description, placements = parse_wiki(body, tag_ids, group_ids, context)
-            validate_tree!(placements, context)
-            members = build_members(placements, revision.fetch('created_at'),
-                                    tag_history, revision_history, context)
-          rescue StandardError => error
-            # 解析できない版も捨てず，当時の Markdown を説明文として保存する．
-            say "#{ context }: 構造化を保留し，本文を保存します (#{ error.message })．"
-            description = body
-            placements = []
-            members = []
-          end
-        end
-
-        { revision:, version_no: index + 1, description:, members:, placements:, body: }
-      end
-    end
-
-    # 自己包含は禁止されてゐるため，当該版は原文の保存を優先する．
-    prepared.each do |group_id, versions|
-      current = versions.last
-      next unless current.fetch(:members).any? { |member| member['tag_group_id'] == group_id }
-
-      say "Tag Group ##{ group_id }: 直接の自己参照を検出したため，現行構造化を保留します．"
-      current[:description] = current.fetch(:body)
-      current[:members] = []
-      current[:placements] = []
-    end
-
-    begin
-      validate_current_groups!(prepared)
-    rescue StandardError => error
-      say "Tag Group の包含関係に問題がありますが，移行を継続します (#{ error.message })．"
-    end
-
-    # 移行先の書込みはすべて検証の後．DDL は含めない．
-    connection.transaction do
-      pages.each do |page|
-        page_id = page.fetch('id').to_i
-        current = prepared.fetch(page_id).last
-
-        insert_row('tag_groups', {
-            id: page_id,
-            # page.version_no ではなく，この Wiki に紐付く Revision の総数．
-            version_no: revisions_by_page.fetch(page_id).size,
-            name: page.fetch('name').delete_prefix(PREFIX),
-            description: current.fetch(:description),
-            created_by_user_id: page.fetch('created_user_id'),
-            updated_by_user_id: page.fetch('updated_user_id'),
-            created_at: page.fetch('created_at'),
-            updated_at: page.fetch('updated_at') })
-      end
-
-      pages.each do |page|
-        page_id = page.fetch('id').to_i
-        name = page.fetch('name').delete_prefix(PREFIX)
-
-        prepared.fetch(page_id).each do |item|
-          revision = item.fetch(:revision)
-
-          insert_row('tag_group_versions', {
-              id: revision.fetch('id'),
-              tag_group_id: page_id,
-              version_no: item.fetch(:version_no),
-              event_type: item.fetch(:version_no) == 1 ? 'create' : 'update',
-              name:,
-              description: item.fetch(:description),
-              members: JSON.generate(item.fetch(:members)),
-              placements: JSON.generate(item.fetch(:placements)),
-              created_by_user_id: revision.fetch('created_user_id'),
-              created_at: revision.fetch('created_at') })
-        end
-      end
-
-      pages.each do |page|
-        page_id = page.fetch('id').to_i
-        current = prepared.fetch(page_id).last
-        revision = current.fetch(:revision)
-
-        current.fetch(:members).each do |member|
-          if member.key?('tag_id')
-            insert_row('tag_group_tags', {
-                tag_group_id: page_id,
-                tag_id: member.fetch('tag_id'),
-                created_by_user_id: revision.fetch('created_user_id'),
-                created_at: revision.fetch('created_at') })
-          else
-            insert_row('tag_group_groups', {
-                tag_group_id: page_id,
-                child_tag_group_id: member.fetch('tag_group_id'),
-                created_by_user_id: revision.fetch('created_user_id'),
-                created_at: revision.fetch('created_at') })
-          end
-        end
-      end
-
-      pages.each do |page|
-        page_id = page.fetch('id').to_i
-        current = prepared.fetch(page_id).last
-        revision = current.fetch(:revision)
-        position = 0
-
-        append = -> nodes, parent_position do
-          nodes.each do |node|
-            position += 1
-            own_position = position
-
-            insert_row('tag_group_placements', {
-                tag_group_id: page_id,
-                position: own_position,
-                parent_position:,
-                section_name: node['section_name'],
-                description: node['description'],
-                tag_id: node['tag_id'],
-                child_tag_group_id: node['tag_group_id'],
-                created_by_user_id: revision.fetch('created_user_id'),
-                updated_by_user_id: revision.fetch('created_user_id'),
-                created_at: revision.fetch('created_at'),
-                updated_at: revision.fetch('created_at') })
-
-            append.(node.fetch('children'), own_position)
-          end
-        end
-
-        append.(current.fetch(:placements), nil)
-      end
-    end
-  end
-
-  def down
-    raise ActiveRecord::IrreversibleMigration, '戻せません．'
-  end
-
-  private
-
-  def assert_empty_destination!
-    ['tag_groups', 'tag_group_versions', 'tag_group_tags',
-     'tag_group_groups', 'tag_group_placements'].each do |table|
-      count = connection.select_value("SELECT COUNT(*) FROM #{ table }").to_i
-      raise "#{ table } が空ではありません．" if count.positive?
-    end
-  end
-
-  # 解決は tag_names.name -> tag_names.tag_id のみ．
-  # tags.tag_name_id は読まない．
-  def load_tag_ids
-    rows = connection.select_all(<<~SQL).to_a
-      SELECT
-        name
-      , tag_id
-      FROM
-        tag_names
-      WHERE
-        language_code = 'ja'
-        AND tag_id IS NOT NULL
-    SQL
-
-    rows.each_with_object({ }) do |row, by_name|
-      name = row.fetch('name')
-      id = row.fetch('tag_id').to_i
-      by_name[name] ||= []
-      by_name[name] << id unless by_name[name].include?(id)
-    end
-  end
-
-  def revision_body revision_id
-    connection.select_rows(<<~SQL).flatten.join("\n")
-      SELECT
-        wl.body
-      FROM
-        wiki_revision_lines wrl
-        INNER JOIN wiki_lines wl ON wl.id = wrl.wiki_line_id
-      WHERE
-        wrl.wiki_revision_id = #{ Integer(revision_id) }
-      ORDER BY
-        wrl.position
-    SQL
-  end
-
-  def parse_wiki markdown, tag_ids, group_ids, context
-    root = Kramdown::Document.new(markdown, input: 'GFM').root
-    placements = []
-    description_parts = []
-    headings = []
-
-    root.children.each_with_index do |node, index|
-      case node.type
-      when :blank
-        next
-      when :header
-        level = node.options.fetch(:level)
-        name = inline_text(node).strip
-        raise "#{ context }: 名前のない見出しがあります．" if name.empty?
-
-        headings.pop while headings.any? && headings.last.first >= level
-        parent = headings.last&.last
-        section = { 'section_name' => name, 'description' => nil, 'children' => [] }
-        (parent ? parent.fetch('children') : placements) << section
-        headings << [level, section]
-      when :p
-        text = inline_markdown(node).strip
-        next if text.empty?
-
-        if headings.any?
-          heading = headings.last.last
-          heading['description'] = [heading['description'], text].compact.join("\n\n")
-        else
-          description_parts << text
-        end
-      when :ul, :ol
-        if headings.any? && see_also_heading?(headings.last.last.fetch('section_name'))
-          heading = headings.last.last
-          raw = original_block(markdown, root.children, index)
-          heading['description'] = [heading['description'], raw].compact.join("\n\n")
-        else
-          target = headings.any? ? headings.last.last.fetch('children') : placements
-          target.concat(node.children.map { |item| parse_list_item(item, tag_ids, group_ids, context) })
-        end
-      else
-        raise "#{ context }: 未対応の Markdown 構文 #{ node.type.inspect }"
-      end
-    end
-
-    [description_parts.empty? ? nil : description_parts.join("\n\n"), placements]
-  end
-
-  def see_also_heading? name
-    ['see also', '関連項目'].include?(name.strip.downcase.sub(/[:：]\z/, ''))
-  end
-
-  def original_block markdown, siblings, index
-    current = siblings.fetch(index)
-    start_line = current.options[:location]
-    raise 'Markdown block の位置が不明です．' unless start_line
-
-    following = siblings[(index + 1)..].find do |node|
-      node.options[:location] && node.options[:location] > start_line
-    end
-    end_line = following ? following.options.fetch(:location) - 1 : markdown.lines.length
-    markdown.lines[(start_line - 1)...end_line].join.strip
-  end
-
-  def parse_list_item item, tag_ids, group_ids, context
-    raise "#{ context }: リスト項目ではありません．" if item.type != :li
-
-    nested, own = item.children.partition { |child| [:ul, :ol].include?(child.type) }
-    own.reject! { |child| child.type == :blank }
-    unless own.all? { |child| [:p, :text, :a, :codespan].include?(child.type) }
-      raise "#{ context }: 未対応のリスト項目があります．"
-    end
-
-    label = own.map { |child| inline_text(child) }.join(' ').strip
-    raise "#{ context }: 空のリスト項目があります．" if label.empty?
-
-    node =
-        if group_ids.key?(label)
-          { 'tag_group_id' => group_ids.fetch(label) }
-        elsif tag_ids.key?(label)
-          ids = tag_ids.fetch(label)
-          unless ids.one?
-            raise "#{ context }: タグ名 #{ label.inspect } が複数の ID を指します：#{ ids.inspect }"
-          end
-          { 'tag_id' => ids.first }
-        elsif label.end_with?(':', '：')
-          name = label.sub(/[:：]\z/, '')
-          raise "#{ context }: 空の区分名があります．" if name.empty?
-          if see_also_heading?(name) && nested.any?
-            raise "#{ context }: リスト内の See also は説明文への保管処理が未実装です．"
-          end
-          { 'section_name' => name, 'description' => nil }
-        else
-          raise "#{ context }: 解決不能なリスト項目 #{ label.inspect }"
-        end
-
-    node['children'] = nested.flat_map do |list|
-      list.children.map { |child| parse_list_item(child, tag_ids, group_ids, context) }
-    end
-
-    node
-  end
-
-  def inline_text node
-    case node.type
-    when :text, :codespan
-      node.value.to_s
-    when :softbreak, :br
-      ' '
-    when :a, :p, :header, :em, :strong, :span, :li
-      node.children.map { |child| inline_text(child) }.join
-    else
-      raise "未対応のインライン構文 #{ node.type.inspect }"
-    end
-  end
-
-  def inline_markdown node
-    case node.type
-    when :text
-      node.value.to_s
-    when :codespan
-      "`#{ node.value }`"
-    when :softbreak
-      "\n"
-    when :br
-      "  \n"
-    when :p
-      node.children.map { |child| inline_markdown(child) }.join
-    when :a
-      href = node.attr.fetch('href')
-      "[#{ node.children.map { |child| inline_markdown(child) }.join }](#{ href })"
-    when :em
-      "*#{ node.children.map { |child| inline_markdown(child) }.join }*"
-    when :strong
-      "**#{ node.children.map { |child| inline_markdown(child) }.join }**"
-    else
-      raise "未対応のインライン構文 #{ node.type.inspect }"
-    end
-  end
-
-  def validate_tree! nodes, context, depth = 1
-    raise "#{ context }: 配置の深さが 5 を超えてゐます．" if depth > 5 && nodes.any?
-
-    nodes.each do |node|
-      name = node['section_name']
-      if name && name.length > 255
-        raise "#{ context }: 区分名が 255 文字を超えてゐます．"
-      end
-      validate_tree!(node.fetch('children'), context, depth + 1)
-    end
-  end
-
-  def build_members nodes, date, tag_history, group_history, context
-    ids_of_tags = []
-    ids_of_groups = []
-
-    visit = -> items do
-      items.each do |node|
-        ids_of_tags << node['tag_id'] if node.key?('tag_id')
-        ids_of_groups << node['tag_group_id'] if node.key?('tag_group_id')
-        visit.(node.fetch('children'))
-      end
-    end
-    visit.(nodes)
-
-    tags = ids_of_tags.uniq.map do |id|
-      { 'tag_id' => id,
-        'version_no' => version_at(tag_history[id], date, context, "Tag ##{ id }") }
-    end
-
-    groups = ids_of_groups.uniq.map do |id|
-      { 'tag_group_id' => id,
-        'version_no' => version_at(group_history[id], date, context, "TagGroup ##{ id }") }
-    end
-
-    tags + groups
-  end
-
-  def version_at history, date, context, target
-    raise "#{ context }: #{ target } の履歴が存在しません．" unless history&.any?
-
-    timestamp = Time.parse(date.to_s)
-    candidates = history.select do |row|
-      Time.parse(row.fetch('created_at').to_s) <= timestamp
-    end
-    if candidates.empty?
-      raise "#{ context }: #{ target } は #{ date } 時点で存在しません．"
-    end
-
-    candidates.max_by { |row|
-      [Time.parse(row.fetch('created_at').to_s), row.fetch('version_no').to_i]
-    }.fetch('version_no').to_i
-  end
-
-  def validate_current_groups! prepared
-    edges = { }
-    prepared.each do |group_id, versions|
-      edges[group_id] = versions.last.fetch(:members)
-                              .filter_map { |member| member['tag_group_id'] }
-    end
-
-    visiting = { }
-    visited = { }
-    visit = -> group_id do
-      raise "Tag Group の循環参照を検出しました：#{ group_id }" if visiting[group_id]
-      return if visited[group_id]
-
-      visiting[group_id] = true
-      edges.fetch(group_id, []).each { |child_id| visit.(child_id) }
-      visiting.delete(group_id)
-      visited[group_id] = true
-    end
-
-    edges.keys.each { |group_id| visit.(group_id) }
-  end
-
-  def quote(value) = connection.quote(value)
-
-  def insert_row table, values
-    columns = values.keys.join(', ')
-    payload = values.values.map { |value| quote(value) }.join(', ')
-    execute "INSERT INTO #{ table } (#{ columns }) VALUES (#{ payload })"
-  end
-end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) do
+ActiveRecord::Schema[8.0].define(version: 2026_09_22_040000) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -440,123 +440,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) do
     t.index ["user_id"], name: "index_settings_on_user_id", unique: true
   end
 
-  create_table "tag_description_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.string "language_code", limit: 16, null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.text "body", null: false
-    t.string "source_language_code", limit: 16
-    t.integer "source_version_no"
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.index ["created_by_user_id"], name: "index_tag_description_versions_on_created_by_user_id"
-    t.index ["tag_id", "language_code", "version_no"], name: "idx_on_tag_id_language_code_version_no_ced77e57e6", unique: true
-    t.index ["tag_id", "source_language_code", "source_version_no"], name: "fk_rails_4f13094dbc"
-    t.index ["tag_id"], name: "index_tag_description_versions_on_tag_id"
-    t.check_constraint "((`source_language_code` is null) and (`source_version_no` is null)) or ((`source_language_code` is not null) and (`source_version_no` is not null))", name: "chk_tag_description_versions_source_pair"
-    t.check_constraint "(`source_language_code` is null) or (`source_language_code` <> `language_code`)", name: "chk_tag_description_versions_source_language_code_different"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "tag_description_versions_event_type_valid"
-    t.check_constraint "`version_no` > 0", name: "chk_tag_description_versions_version_no_positive"
-  end
-
-  create_table "tag_descriptions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.string "language_code", limit: 16, null: false
-    t.integer "version_no", null: false
-    t.text "body", null: false
-    t.string "source_language_code", limit: 16
-    t.integer "source_version_no"
-    t.bigint "created_by_user_id"
-    t.bigint "updated_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_tag_descriptions_on_created_by_user_id"
-    t.index ["language_code"], name: "index_tag_descriptions_on_language_code"
-    t.index ["source_language_code", "source_version_no"], name: "idx_on_source_language_code_source_version_no_00117fe02a"
-    t.index ["tag_id", "language_code"], name: "index_tag_descriptions_on_tag_id_and_language_code", unique: true
-    t.index ["tag_id", "source_language_code", "source_version_no"], name: "fk_rails_d1be0a7696"
-    t.index ["tag_id"], name: "index_tag_descriptions_on_tag_id"
-    t.index ["updated_by_user_id"], name: "index_tag_descriptions_on_updated_by_user_id"
-    t.check_constraint "((`source_language_code` is null) and (`source_version_no` is null)) or ((`source_language_code` is not null) and (`source_version_no` is not null))", name: "chk_tag_descriptions_source_pair"
-    t.check_constraint "(`source_language_code` is null) or (`source_language_code` <> `language_code`)", name: "chk_tag_descriptions_source_language_code_different"
-    t.check_constraint "`version_no` > 0", name: "chk_tag_descriptions_version_no_positive"
-  end
-
-  create_table "tag_group_groups", primary_key: ["tag_group_id", "child_tag_group_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_group_id", null: false
-    t.bigint "child_tag_group_id", null: false
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.index ["child_tag_group_id"], name: "index_tag_group_groups_on_child_tag_group_id"
-    t.index ["created_by_user_id"], name: "index_tag_group_groups_on_created_by_user_id"
-    t.check_constraint "`tag_group_id` <> `child_tag_group_id`", name: "chk_tag_group_groups_tag_group_id_not_child_tag_group_id"
-  end
-
-  create_table "tag_group_placements", primary_key: ["tag_group_id", "position"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_group_id", null: false
-    t.integer "position", null: false
-    t.integer "parent_position"
-    t.string "section_name"
-    t.text "description"
-    t.bigint "tag_id"
-    t.bigint "child_tag_group_id"
-    t.bigint "created_by_user_id"
-    t.bigint "updated_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["child_tag_group_id"], name: "index_tag_group_placements_on_child_tag_group_id"
-    t.index ["created_by_user_id"], name: "index_tag_group_placements_on_created_by_user_id"
-    t.index ["tag_group_id", "child_tag_group_id"], name: "fk_rails_7342b54ced"
-    t.index ["tag_group_id", "parent_position"], name: "fk_rails_3af6ee71ca"
-    t.index ["tag_group_id", "tag_id"], name: "fk_rails_365dc60759"
-    t.index ["tag_id"], name: "index_tag_group_placements_on_tag_id"
-    t.index ["updated_by_user_id"], name: "index_tag_group_placements_on_updated_by_user_id"
-    t.check_constraint "(((`section_name` is not null) and (`tag_id` is null) and (`child_tag_group_id` is null)) or ((`section_name` is null) and (`tag_id` is not null) and (`child_tag_group_id` is null)) or ((`section_name` is null) and (`tag_id` is null) and (`child_tag_group_id` is not null))) and ((`section_name` is not null) or (`description` is null))", name: "chk_tag_group_placements_references_exclusive"
-    t.check_constraint "`position` > `parent_position`", name: "chk_tag_group_placements_position_gt_parent_position"
-  end
-
-  create_table "tag_group_tags", primary_key: ["tag_group_id", "tag_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_group_id", null: false
-    t.bigint "tag_id", null: false
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.index ["created_by_user_id"], name: "index_tag_group_tags_on_created_by_user_id"
-    t.index ["tag_id"], name: "index_tag_group_tags_on_tag_id"
-  end
-
-  create_table "tag_group_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_group_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "name", null: false
-    t.text "description"
-    t.json "members", null: false
-    t.json "placements", null: false
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.index ["created_by_user_id"], name: "index_tag_group_versions_on_created_by_user_id"
-    t.index ["tag_group_id", "version_no"], name: "index_tag_group_versions_on_tag_group_id_and_version_no", unique: true
-    t.index ["tag_group_id"], name: "index_tag_group_versions_on_tag_group_id"
-    t.check_constraint "`version_no` > 0", name: "chk_tag_group_versions_version_no_positive"
-    t.check_constraint "json_schema_valid(_utf8mb4'{\"type\":\"array\",\"items\":{\"type\":\"object\",\"required\":[\"children\"],\"properties\":{\"section_name\":{\"type\":\"string\"},\"description\":{\"type\":[\"string\",\"null\"]},\"tag_id\":{\"type\":\"integer\",\"minimum\":1},\"tag_group_id\":{\"type\":\"integer\",\"minimum\":1},\"children\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"required\":[\"children\"],\"properties\":{\"section_name\":{\"type\":\"string\"},\"description\":{\"type\":[\"string\",\"null\"]},\"tag_id\":{\"type\":\"integer\",\"minimum\":1},\"tag_group_id\":{\"type\":\"integer\",\"minimum\":1},\"children\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"required\":[\"children\"],\"properties\":{\"section_name\":{\"type\":\"string\"},\"description\":{\"type\":[\"string\",\"null\"]},\"tag_id\":{\"type\":\"integer\",\"minimum\":1},\"tag_group_id\":{\"type\":\"integer\",\"minimum\":1},\"children\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"required\":[\"children\"],\"properties\":{\"section_name\":{\"type\":\"string\"},\"description\":{\"type\":[\"string\",\"null\"]},\"tag_id\":{\"type\":\"integer\",\"minimum\":1},\"tag_group_id\":{\"type\":\"integer\",\"minimum\":1},\"children\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"required\":[\"children\"],\"properties\":{\"section_name\":{\"type\":\"string\"},\"description\":{\"type\":[\"string\",\"null\"]},\"tag_id\":{\"type\":\"integer\",\"minimum\":1},\"tag_group_id\":{\"type\":\"integer\",\"minimum\":1},\"children\":{\"type\":\"array\",\"maxItems\":0}},\"oneOf\":[{\"required\":[\"section_name\"]},{\"required\":[\"tag_id\"]},{\"required\":[\"tag_group_id\"]}],\"dependencies\":{\"description\":[\"section_name\"]},\"additionalProperties\":false}}},\"oneOf\":[{\"required\":[\"section_name\"]},{\"required\":[\"tag_id\"]},{\"required\":[\"tag_group_id\"]}],\"dependencies\":{\"description\":[\"section_name\"]},\"additionalProperties\":false}}},\"oneOf\":[{\"required\":[\"section_name\"]},{\"required\":[\"tag_id\"]},{\"required\":[\"tag_group_id\"]}],\"dependencies\":{\"description\":[\"section_name\"]},\"additionalProperties\":false}}},\"oneOf\":[{\"required\":[\"section_name\"]},{\"required\":[\"tag_id\"]},{\"required\":[\"tag_group_id\"]}],\"dependencies\":{\"description\":[\"section_name\"]},\"additionalProperties\":false}}},\"oneOf\":[{\"required\":[\"section_name\"]},{\"required\":[\"tag_id\"]},{\"required\":[\"tag_group_id\"]}],\"dependencies\":{\"description\":[\"section_name\"]},\"additionalProperties\":false}}',`placements`)", name: "chk_tag_group_versions_placements_schema"
-    t.check_constraint "json_schema_valid(_utf8mb4'{\"type\":\"array\",\"uniqueItems\":true,\"items\":{\"oneOf\":[{\"type\":\"object\",\"required\":[\"tag_id\",\"version_no\"],\"properties\":{\"tag_id\":{\"type\":\"integer\",\"minimum\":1},\"version_no\":{\"type\":\"integer\",\"minimum\":1}},\"additionalProperties\":false},{\"type\":\"object\",\"required\":[\"tag_group_id\",\"version_no\"],\"properties\":{\"tag_group_id\":{\"type\":\"integer\",\"minimum\":1},\"version_no\":{\"type\":\"integer\",\"minimum\":1}},\"additionalProperties\":false}]}}',`members`)", name: "chk_tag_group_versions_members_schema"
-  end
-
-  create_table "tag_groups", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.integer "version_no", null: false
-    t.string "name", null: false
-    t.text "description"
-    t.bigint "created_by_user_id"
-    t.bigint "updated_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_tag_groups_on_created_by_user_id"
-    t.index ["name"], name: "index_tag_groups_on_name", unique: true
-    t.index ["updated_by_user_id"], name: "index_tag_groups_on_updated_by_user_id"
-    t.check_constraint "`version_no` > 0", name: "chk_tag_groups_version_no_positive"
-  end
-
   create_table "tag_implications", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "tag_id", null: false
     t.bigint "parent_tag_id", null: false
@@ -773,6 +656,19 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) do
     t.index ["banned_at"], name: "index_users_on_banned_at"
   end
 
+  create_table "wiki_assets", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "wiki_page_id", null: false
+    t.integer "no", null: false
+    t.string "alt_text"
+    t.binary "sha256", limit: 32, null: false
+    t.bigint "created_by_user_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["created_by_user_id"], name: "index_wiki_assets_on_created_by_user_id"
+    t.index ["wiki_page_id", "no"], name: "index_wiki_assets_on_wiki_page_id_and_no", unique: true
+    t.index ["wiki_page_id", "sha256"], name: "index_wiki_assets_on_wiki_page_id_and_sha256", unique: true
+  end
+
   create_table "wiki_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "sha256", limit: 64, null: false
     t.text "body", null: false
@@ -789,6 +685,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
+    t.integer "next_asset_no", default: 1, null: false
     t.integer "version_no", null: false
     t.index ["created_user_id"], name: "index_wiki_pages_on_created_user_id"
     t.index ["discarded_at"], name: "index_wiki_pages_on_discarded_at"
@@ -891,26 +788,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) do
   add_foreign_key "post_versions", "users", column: "created_by_user_id"
   add_foreign_key "posts", "users", column: "uploaded_user_id"
   add_foreign_key "settings", "users"
-  add_foreign_key "tag_description_versions", "tag_description_versions", column: ["tag_id", "source_language_code", "source_version_no"], primary_key: ["tag_id", "language_code", "version_no"]
-  add_foreign_key "tag_descriptions", "languages", column: "language_code", primary_key: "code"
-  add_foreign_key "tag_descriptions", "tag_description_versions", column: ["tag_id", "source_language_code", "source_version_no"], primary_key: ["tag_id", "language_code", "version_no"]
-  add_foreign_key "tag_descriptions", "tags"
-  add_foreign_key "tag_descriptions", "users", column: "created_by_user_id"
-  add_foreign_key "tag_descriptions", "users", column: "updated_by_user_id"
-  add_foreign_key "tag_group_groups", "tag_groups"
-  add_foreign_key "tag_group_groups", "tag_groups", column: "child_tag_group_id"
-  add_foreign_key "tag_group_groups", "users", column: "created_by_user_id"
-  add_foreign_key "tag_group_placements", "tag_group_groups", column: ["tag_group_id", "child_tag_group_id"], primary_key: ["tag_group_id", "child_tag_group_id"]
-  add_foreign_key "tag_group_placements", "tag_group_placements", column: ["tag_group_id", "parent_position"], primary_key: ["tag_group_id", "position"]
-  add_foreign_key "tag_group_placements", "tag_group_tags", column: ["tag_group_id", "tag_id"], primary_key: ["tag_group_id", "tag_id"]
-  add_foreign_key "tag_group_placements", "tag_groups"
-  add_foreign_key "tag_group_placements", "users", column: "created_by_user_id"
-  add_foreign_key "tag_group_placements", "users", column: "updated_by_user_id"
-  add_foreign_key "tag_group_tags", "tag_groups"
-  add_foreign_key "tag_group_tags", "tags"
-  add_foreign_key "tag_group_tags", "users", column: "created_by_user_id"
-  add_foreign_key "tag_groups", "users", column: "created_by_user_id"
-  add_foreign_key "tag_groups", "users", column: "updated_by_user_id"
   add_foreign_key "tag_implications", "tags"
   add_foreign_key "tag_implications", "tags", column: "parent_tag_id"
   add_foreign_key "tag_names", "languages", column: "language_code", primary_key: "code"
@@ -945,6 +822,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) do
   add_foreign_key "user_post_views", "posts"
   add_foreign_key "user_post_views", "users"
   add_foreign_key "user_theme_slots", "users"
+  add_foreign_key "wiki_assets", "users", column: "created_by_user_id"
+  add_foreign_key "wiki_assets", "wiki_pages"
   add_foreign_key "wiki_pages", "tag_names"
   add_foreign_key "wiki_pages", "users", column: "created_user_id"
   add_foreign_key "wiki_pages", "users", column: "updated_user_id"

backend/lib/tasks/export_nico.rake

@@ -3,8 +3,8 @@ namespace :nico do
   task export: :environment do
     require 'open3'
 
-    mysql_user = ENV.fetch('NIZIKA_NICO_MYSQL_USER')
-    mysql_pass = ENV.fetch('NIZIKA_NICO_MYSQL_PASS')
+    mysql_user = ENV.fetch('MYSQL_USER')
+    mysql_pass = ENV.fetch('MYSQL_PASS')
     nizika_nico_path = ENV.fetch('NIZIKA_NICO_PATH')
 
     videos = Post.where('url LIKE ?', '%nicovideo.jp/watch/%').pluck(:url).filter_map {
@@ -14,7 +14,7 @@ namespace :nico do
     next if videos.empty?
 
     _, stderr, status = Open3.capture3(
-        { 'NIZIKA_NICO_MYSQL_USER' => mysql_user, 'NIZIKA_NICO_MYSQL_PASS' => mysql_pass },
+        { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
         'python3', '-m', 'tracked_videos.put_bulk_upsert', *videos,
         chdir: nizika_nico_path)
 

backend/lib/tasks/migrate_help_pages.rake

@@ -1,51 +0,0 @@
-namespace :help do
-  desc 'ヘルプ移行'
-  task migrate: :environment do
-    help_path = ENV.fetch('BTRC_HUB_HELP_PATH')
-    abort 'ヘルプ置場指定してね．' if help_path.blank?
-
-    # ファイルがすでに存在する場合は通さなぃ．
-    abort 'ファイル消してね．' if Dir.glob("#{ help_path }/*").present?
-
-    # 現状物理削除はなぃはず
-    pages = 
-        WikiPage
-        .joins(:tag_name)
-        .where(tag_names: { tag_id: nil, language_code: 'ja' })
-        .where.not("tag_names.name LIKE 'タググループ:%'")
-
-    puts "移行対象: #{pages.count} 件"
-    abort '移行対象がありません．' if pages.empty?
-
-    pages.find_each do |page|
-      puts page.body
-      puts page.title
-
-      puts 'この identifier は何にする?'
-      identifier = $stdin.gets.chomp
-      Dir.mkdir "#{ help_path }/#{ identifier }"
-      Dir.mkdir "#{ help_path }/#{ identifier }/editions"
-      Dir.mkdir "#{ help_path }/#{ identifier }/editions/ja"
-
-      last_file_name = ''
-      WikiVersion.where(wiki_page_id: page.id).order(:version_no).each do |ver|
-        last_file_name, last_file_name_no = last_file_name.split('.')
-
-        file_name = ver.created_at.strftime('%Y-%m-%d')
-        if file_name == last_file_name
-          file_name += ".#{ (last_file_name_no || 1).to_i + 1 }"
-        end
-
-        body = "# #{ ver.title.sub(/^ヘルプ:/, '') }\n\n#{ ver.body }"
-        File.write "#{ help_path }/#{ identifier }/editions/ja/#{ file_name }.mdx", body
-
-        last_file_name = file_name
-      end
-
-      article_meta = { 'identifier' => identifier,
-                       'canonical_language' => 'ja',
-                       'languages' => { 'ja' => { 'current_edition' => last_file_name } } }
-      File.write "#{ help_path }/#{ identifier }/article.yml", article_meta.to_yaml
-    end
-  end
-end

backend/lib/tasks/sync_nico.rake

@@ -54,11 +54,11 @@ namespace :nico do
           .find_each(&:destroy!)
     end
 
-    mysql_user = ENV['NIZIKA_NICO_MYSQL_USER']
-    mysql_pass = ENV['NIZIKA_NICO_MYSQL_PASS']
+    mysql_user = ENV['MYSQL_USER']
+    mysql_pass = ENV['MYSQL_PASS']
     nizika_nico_path = ENV['NIZIKA_NICO_PATH']
     stdout, stderr, status = Open3.capture3(
-        { 'NIZIKA_NICO_MYSQL_USER' => mysql_user, 'NIZIKA_NICO_MYSQL_PASS' => mysql_pass },
+        { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
         'python3', "#{ nizika_nico_path }/get_videos.py")
 
     unless status.success?

backend/spec/db/tag_description_migration_spec.rb

@@ -1,34 +0,0 @@
-require 'rails_helper'
-require_relative '../../db/migrate/20261003010000_migrate_tag_descriptions_from_wiki_pages'
-
-RSpec.describe 'Tag description migration identity' do
-  it 'preserves every revision ID and repeated body in an independent sequence' do
-    user = create_member_user!
-    tag_name = create(:tag_name, name: 'description_migration')
-    page = Wiki::Commit.create_legacy_content!(
-        tag_name:, body: 'A', created_by_user: user)
-    revisions = [page.current_revision]
-    ['A', 'B', 'B', 'A'].each do |body|
-      revisions << Wiki::Commit.legacy_content!(
-          page:, body:, created_user: user, base_revision_id: revisions.last.id)
-    end
-    tag = create(:tag, primary_tag_name: tag_name)
-    legacy_state = [page.reload.attributes, revisions.map(&:attributes)]
-    expect(page.wiki_versions.count).to eq(3)
-
-    migration = MigrateTagDescriptionsFromWikiPages.new
-    migration.suppress_messages { migration.up }
-
-    versions = TagDescriptionVersion.where(tag_id: tag.id, language_code: 'ja')
-        .order(:version_no)
-    expect(versions.pluck(:id)).to eq(revisions.map(&:id))
-    expect(versions.pluck(:version_no)).to eq([1, 2, 3, 4, 5])
-    expect(versions.pluck(:body)).to eq(['A', 'A', 'B', 'B', 'A'])
-    expect(versions.pluck(:created_by_user_id)).to eq([user.id] * 5)
-    expect(versions.pluck(:created_at)).to eq(revisions.map(&:created_at))
-    expect(TagDescription.find(page.id)).to have_attributes(
-        tag_id: tag.id, language_code: 'ja', version_no: 5, body: 'A')
-    expect([page.reload.attributes, revisions.map { |revision| revision.reload.attributes }])
-        .to eq(legacy_state)
-  end
-end

backend/spec/db/tag_group_constraints_spec.rb

@@ -1,110 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group persistence constraints' do
-  include TagGroupRecords
-
-  let!(:user) { create_member_user! }
-  let!(:tag) { group_tag('制約確認') }
-  let!(:group_id) do
-    seed_group(
-        name: '制約確認',
-        members: [{ 'tag_id' => tag.id, 'version_no' => tag.version_no }])
-  end
-
-  def placement attributes
-    insert_group_row('tag_group_placements', {
-        tag_group_id: group_id, position: 1,
-        created_at: Time.current, updated_at: Time.current }.merge(attributes))
-  end
-
-  def reject_statement
-    before_state = group_state
-    expect { yield }.to raise_error(ActiveRecord::StatementInvalid)
-    expect(group_state).to eq(before_state)
-  end
-
-  it 'allows membership without placement' do
-    expect(group_rows('tag_group_tags', tag_group_id: group_id).size).to eq(1)
-    expect(group_rows('tag_group_placements', tag_group_id: group_id)).to be_empty
-  end
-
-  it 'allows repeated Tag placements with unique membership' do
-    placement(tag_id: tag.id)
-    placement(tag_id: tag.id, position: 2)
-    expect(group_rows('tag_group_tags', tag_group_id: group_id).size).to eq(1)
-    expect(group_rows('tag_group_placements', tag_group_id: group_id).size).to eq(2)
-  end
-
-  it 'rejects duplicate Tag membership' do
-    reject_statement do
-      insert_group_row('tag_group_tags', {
-          tag_group_id: group_id, tag_id: tag.id, created_at: Time.current })
-    end
-  end
-
-  it 'rejects duplicate child membership' do
-    child_id = seed_group(name: '子')
-    attributes = { tag_group_id: group_id, child_tag_group_id: child_id,
-                   created_at: Time.current }
-    insert_group_row('tag_group_groups', attributes)
-    reject_statement { insert_group_row('tag_group_groups', attributes) }
-  end
-
-  it 'rejects direct self membership' do
-    reject_statement do
-      insert_group_row('tag_group_groups', {
-          tag_group_id: group_id, child_tag_group_id: group_id, created_at: Time.current })
-    end
-  end
-
-  it 'rejects a placement without a kind' do
-    reject_statement { placement({ }) }
-  end
-
-  it 'rejects simultaneous Section and Tag kinds' do
-    reject_statement { placement(section_name: '区分', tag_id: tag.id) }
-  end
-
-  it 'rejects a description attached to a Tag placement' do
-    reject_statement { placement(tag_id: tag.id, description: '不正') }
-  end
-
-  it 'allows an optional description on a Section' do
-    placement(section_name: '区分', description: '説明')
-    expect(group_rows('tag_group_placements', tag_group_id: group_id).sole)
-        .to include('section_name' => '区分', 'description' => '説明')
-  end
-
-  it 'rejects a Tag placement absent from membership' do
-    other = group_tag('非メンバー')
-    reject_statement { placement(tag_id: other.id) }
-  end
-
-  it 'rejects a missing parent placement' do
-    reject_statement { placement(section_name: '子', parent_position: 9) }
-  end
-
-  it 'rejects a child ordered before its parent' do
-    placement(section_name: '親', position: 2)
-    reject_statement { placement(section_name: '子', position: 1, parent_position: 2) }
-  end
-
-  it 'rejects duplicate group names' do
-    reject_statement { seed_group(name: '制約確認') }
-  end
-
-  it 'rejects a missing mandatory group name' do
-    reject_statement { seed_group(name: nil) }
-  end
-
-  it 'rejects a six-level snapshot' do
-    nodes = []
-    6.times { nodes = [{ 'tag_id' => tag.id, 'children' => nodes }] }
-    reject_statement do
-      insert_group_row('tag_group_versions', {
-          tag_group_id: group_id, version_no: 2, event_type: 'update', name: '制約確認',
-          members: [{ 'tag_id' => tag.id, 'version_no' => tag.version_no }].to_json,
-          placements: nodes.to_json, created_at: Time.current })
-    end
-  end
-end

backend/spec/db/tag_group_migration_spec.rb

@@ -1,119 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group migration identity and structure' do
-  include TagGroupRecords
-
-  let!(:user) { create_member_user! }
-
-  before { I18n.locale = :ja }
-
-  it 'preserves page and revision IDs, timestamps and repeated historical structures' do
-    tag = group_tag('洗澡鹿')
-    body = "説明文\n\n- 洗澡鹿\n- 洗澡鹿"
-    page = legacy_group('伊地知ニジカ亜種', body)
-    revisions = [page.current_revision]
-    [body, '# 空の区分', body].each do |text|
-      revisions << Wiki::Commit.legacy_content!(page:, body: text, created_user: user)
-    end
-    before_state = group_state.except(*TagGroupRecords::GROUP_TABLES)
-
-    migrate_groups
-
-    versions = group_rows('tag_group_versions', tag_group_id: page.id)
-        .sort_by { _1.fetch('version_no') }
-    expect(versions.map { _1.fetch('id') }).to eq(revisions.map(&:id))
-    expect(versions.map { _1.fetch('version_no') }).to eq([1, 2, 3, 4])
-    expect(versions.map { _1.fetch('created_at') }).to eq(revisions.map(&:created_at))
-    expect(versions.map { _1.fetch('created_by_user_id') }).to eq([user.id] * 4)
-    expect(versions.map { _1.fetch('event_type') }).to eq(['create', 'update', 'update', 'update'])
-    expect(group_version(page.id, 1).fetch('placements')).to eq(
-        group_version(page.id, 2).fetch('placements'))
-    expect(group_version(page.id, 3).fetch('placements')).to eq([
-        { 'section_name' => '空の区分', 'description' => nil, 'children' => [] }])
-    expect_group_snapshot(
-        page.id, number: 4, description: '説明文',
-        members: [{ 'tag_id' => tag.id, 'version_no' => tag.version_no }],
-        placements: [{ 'tag_id' => tag.id, 'children' => [] }] * 2)
-    expect(group_rows('tag_groups', id: page.id).sole).to include(
-        'created_at' => page.created_at, 'updated_at' => page.reload.updated_at)
-    expect(group_state.except(*TagGroupRecords::GROUP_TABLES)).to eq(before_state)
-  end
-
-  it 'migrates nested list Sections and child groups as different placement kinds' do
-    series = group_tag('ぼざろクリーチャーシリーズ')
-    deer = group_tag('洗澡鹿')
-    nijika = group_tag('伊地知ニジカ')
-    child = legacy_group('伊地知ニジカ亜種', <<~MARKDOWN)
-      - ぼざろクリーチャーシリーズ
-        - 伊地知ニジカ亜種:
-          - 洗澡鹿
-    MARKDOWN
-    parent = legacy_group('ぼざろクリーチャーシリーズのキャラクター', <<~MARKDOWN)
-      - ぼざろクリーチャーシリーズ
-        - 伊地知ニジカ
-          - タググループ:伊地知ニジカ亜種
-    MARKDOWN
-
-    migrate_groups
-
-    expect_group_snapshot(
-        child.id, number: 1,
-        members: [series, deer].map { { 'tag_id' => _1.id, 'version_no' => _1.version_no } },
-        placements: [{ 'tag_id' => series.id, 'children' => [
-            { 'section_name' => '伊地知ニジカ亜種', 'description' => nil,
-              'children' => [{ 'tag_id' => deer.id, 'children' => [] }] }] }])
-    expect_group_snapshot(
-        parent.id, number: 1,
-        members: [
-            { 'tag_id' => series.id, 'version_no' => series.version_no },
-            { 'tag_id' => nijika.id, 'version_no' => nijika.version_no },
-            { 'tag_group_id' => child.id, 'version_no' => 1 }],
-        placements: [{ 'tag_id' => series.id, 'children' => [
-            { 'tag_id' => nijika.id, 'children' => [
-                { 'tag_group_id' => child.id, 'children' => [] }] }] }])
-  end
-
-  it 'preserves heading order, group paragraphs and Section descriptions' do
-    names = ['タグ希望', 'キャラクター名希望', '楽曲情報希望', 'bot操作', 'ニジラー情報不詳']
-    tags = names.map { group_tag(_1) }
-    markdown = <<~MARKDOWN
-      全体の説明
-
-      # 要求
-      要求の説明
-
-      - タグ希望
-        - キャラクター名希望
-        - 楽曲情報希望
-
-      # 情報
-      - bot操作
-      - ニジラー情報不詳
-    MARKDOWN
-    page = legacy_group('メタタグ', markdown)
-    expect(page.current_revision.body).to eq(markdown.chomp)
-
-    migrate_groups
-
-    leaves = tags.map { { 'tag_id' => _1.id, 'children' => [] } }
-    leaves.first['children'] = leaves[1..2]
-    expect_group_snapshot(
-        page.id, number: 1, description: '全体の説明',
-        members: tags.map { { 'tag_id' => _1.id, 'version_no' => _1.version_no } },
-        placements: [
-            { 'section_name' => '要求', 'description' => '要求の説明',
-              'children' => [leaves.first] },
-            { 'section_name' => '情報', 'description' => nil,
-              'children' => leaves[3..4] }])
-  end
-
-  it 'leaves Help in the legacy domain' do
-    page = Wiki::Commit.create_legacy_content!(
-        tag_name: create(:tag_name, name: 'Help:移行対象外'),
-        body: 'Help 本文', created_by_user: user)
-    before_state = group_state
-    migrate_groups
-    expect(group_state).to eq(before_state)
-    expect(page.reload.body).to eq('Help 本文')
-  end
-end

backend/spec/models/shared_tag_ids_spec.rb

@@ -1,84 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Shared Tag and ExternalTag IDs', type: :model do
-  include TagGroupRecords
-  let(:user) { create_member_user! }
-
-  def create_resource resource
-    if resource == :tag
-      Tag.find_or_create_by_tag_name!(Locale.nipponese, 'shared_id_new', category: :general)
-    else
-      ExternalTag.create!(platform: :nico, name: 'shared_id_new')
-    end
-  end
-
-  [:tag, :external_tag].each do |resource|
-    it "starts #{ resource } at 1 when both tables are empty" do
-      expect(Tag.count).to eq(0)
-      expect(ExternalTag.count).to eq(0)
-      expect(create_resource(resource).id).to eq(1)
-    end
-
-    it "allocates #{ resource } above the other table's maximum" do
-      create(:tag, id: resource == :tag ? 1 : 20)
-      create(:external_tag, id: resource == :external_tag ? 1 : 20)
-
-      expect(create_resource(resource).id).to eq(21)
-    end
-
-    it "uses the current maximum after deleting earlier #{ resource } records" do
-      tag = create(:tag, id: 100)
-      TagName.where(tag_id: tag.id).update_all(tag_id: nil)
-      tag.destroy!
-      create(:external_tag, id: 200).destroy!
-      expect(Tag.unscoped.count).to eq(0)
-      expect(ExternalTag.unscoped.count).to eq(0)
-      expect(create_resource(resource).id).to eq(1)
-    end
-
-    it "preserves legacy overlaps and gaps when creating #{ resource }" do
-      [1, 2, 5].each { create(:tag, id: _1) }
-      [1, 3, 8].each { create(:external_tag, id: _1) }
-      tags = Tag.order(:id).map(&:attributes)
-      external_tags = ExternalTag.order(:id).map(&:attributes)
-
-      record = create_resource(resource)
-
-      aggregate_failures do
-        expect(record.id).to eq(9)
-        expect(Tag.where(id: [1, 2, 5]).order(:id).map(&:attributes)).to eq(tags)
-        expect(ExternalTag.where(id: [1, 3, 8]).order(:id).map(&:attributes)).to eq(external_tags)
-        expect(Tag.exists?(id: 3)).to be(false)
-        expect(ExternalTag.exists?(id: 2)).to be(false)
-      end
-    end
-
-    it "ignores the description and group ID space when creating #{ resource }" do
-      tag = create(:tag, id: 1)
-      create(:external_tag, id: 2)
-      TagDescription.create!(id: 100, tag:, language_code: 'ja', body: '', version_no: 1)
-      seed_group(name: 'separate_space', id: 200)
-
-      expect(create_resource(resource).id).to eq(3)
-    end
-  end
-
-  it 'preserves overlapping IDs during updates without rewriting the other resource' do
-    tag = create(:tag, id: 5)
-    external = create(:external_tag, id: 5)
-    tag.update!(category: :meta)
-    external.update!(name: 'updated_external')
-
-    expect(tag.reload.id).to eq(5)
-    expect(external.reload.id).to eq(5)
-    expect(tag.category).to eq('meta')
-    expect(external.name).to eq('updated_external')
-    expect(Tag.count).to eq(1)
-    expect(ExternalTag.count).to eq(1)
-  end
-
-  it 'allocates distinct IDs for successive creations across both tables' do
-    records = [:tag, :external_tag].map { create_resource(_1) }
-    expect(records.map(&:id)).to eq([1, 2])
-  end
-end

backend/spec/models/tag_repr_spec.rb

@@ -1,50 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe TagRepr do
-  let(:tag) { create(:tag) }
-
-  def description_for record
-    TagDescription.create!(tag: record, language_code: 'ja', body: '', version_no: 1)
-  end
-
-  it 'keeps has_wiki boolean for the selected language in base and inline' do
-    description_for(tag)
-    [:base, :inline].each do |method|
-      expect(described_class.public_send(method, tag).as_json.fetch('has_wiki')).to be(true)
-      expect(described_class.public_send(method, tag, language_code: 'en')
-          .as_json.fetch('has_wiki')).to be(false)
-    end
-  end
-
-  it 'uses the same language for a tag and its parents' do
-    parent = create(:tag)
-    description_for(tag)
-    description_for(parent)
-    TagImplication.create!(tag:, parent_tag: parent)
-    ['ja', 'en'].each do |language_code|
-      row = described_class.base(tag, language_code:).as_json
-      expected = language_code == 'ja'
-      expect(row.fetch('has_wiki')).to be(expected)
-      expect(row.fetch('parents').sole.fetch('has_wiki')).to be(expected)
-    end
-  end
-
-  it 'preloads existence checks for many tags and their parents without Wiki reads' do
-    parent = create(:tag)
-    description_for(parent)
-    records = Array.new(3) do
-      create(:tag).tap { TagImplication.create!(tag: _1, parent_tag: parent) }
-    end
-    description_for(records.first)
-    queries = []
-    subscriber = ->(*args) { queries << args.last.fetch(:sql) }
-    rows = nil
-    ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') do
-      rows = described_class.many(records).as_json
-    end
-    expect(rows.map { _1.fetch('has_wiki') }).to eq([true, false, false])
-    expect(rows.map { _1.fetch('parents').sole.fetch('has_wiki') }).to eq([true] * 3)
-    expect(queries.grep(/\bSELECT\b.*\btag_descriptions\b/im).size).to be <= 2
-    expect(queries.grep(/\bwiki_(pages|revisions|versions)\b/i)).to be_empty
-  end
-end

backend/spec/models/tag_spec.rb

@@ -1,47 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe Tag, type: :model do
-  describe '#has_description?' do
-    let(:tag) { create(:tag) }
-
-    it 'checks the requested language and treats an empty description as present' do
-      TagDescription.create!(tag:, language_code: 'ja', body: '', version_no: 1)
-      expect(tag.has_description?(language_code: 'ja')).to be(true)
-      expect(tag.has_description?(language_code: 'en')).to be(false)
-    end
-
-    it 'returns false without a description' do
-      expect(tag.has_description?(language_code: 'ja')).to be(false)
-    end
-
-    it 'does not use a Wiki page as evidence of a description' do
-      user = create_member_user!
-      Wiki::Commit.create_legacy_content!(tag_name: tag.tag_name('ja'), body: 'legacy',
-                                          created_by_user: user)
-      expect(tag.has_description?(language_code: 'ja')).to be(false)
-    end
-
-    it 'reuses preloaded descriptions without reading Wiki or querying again' do
-      TagDescription.create!(tag:, language_code: 'ja', body: '', version_no: 1)
-      loaded = Tag.includes(:tag_descriptions).find(tag.id)
-      queries = []
-      subscriber = ->(*args) { queries << args.last.fetch(:sql) }
-      ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') do
-        expect(loaded.has_description?(language_code: 'ja')).to be(true)
-        expect(loaded.has_description?(language_code: 'en')).to be(false)
-      end
-      expect(queries).to be_empty
-    end
-
-    it 'keeps language selection generic without enabling another Language record' do
-      tag.association(:tag_descriptions).target = [
-          TagDescription.new(tag:, language_code: 'en', body: '', version_no: 1)]
-      tag.association(:tag_descriptions).loaded!
-      expect(tag.has_description?(language_code: 'en')).to be(true)
-      expect(tag.has_description?(language_code: 'ja')).to be(false)
-    end
-  end
-
   describe 'external tag separation' do
     ['nico:reserved', 'NiCo:reserved'].each do |name|
       it "rejects the reserved prefix #{ name } for internal tags" do

backend/spec/requests/materials_spec.rb

@@ -178,7 +178,6 @@ RSpec.describe 'Materials API', type: :request do
   end
 
   describe 'GET /materials/:id' do
-    include WikiRecords
     let!(:tag) do
       create(:tag, primary_name: 'material_show', category: :material)
     end
@@ -206,56 +205,6 @@ RSpec.describe 'Materials API', type: :request do
       get '/materials/999999999'
       expect(response).to have_http_status(:not_found)
     end
-
-    def get_material_without_legacy_reads
-      queries = []
-      subscriber = lambda do |*args|
-        sql = args.last.fetch(:sql)
-        if sql.match?(/\bSELECT\b/i) && sql.match?(/\bwiki_(pages|revisions|versions)\b/i)
-          queries << sql
-        end
-      end
-      ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') do
-        get "/materials/#{ material.id }"
-      end
-      expect(response).to have_http_status(:ok)
-      expect(queries).to be_empty
-    end
-
-    it 'reads the description even when the legacy revision has different content' do
-      page = seed_wiki_page(tag_name: tag.tag_name('ja'), body: 'legacy body',
-                            created_by_user: member_user)
-      TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-          .update!(body: 'description body')
-      get_material_without_legacy_reads
-      expect(json.fetch('wiki_page_body')).to eq('description body')
-      expect(page.current_revision.body).to eq('legacy body')
-    end
-
-    it 'uses tag_id rather than description ID without a Wiki page or TagName' do
-      description = TagDescription.create!(id: tag.id + 1000, tag:, language_code: 'ja',
-                                           body: 'independent body', version_no: 1)
-      tag.tag_names.update_all(tag_id: nil)
-      get_material_without_legacy_reads
-      expect(description.id).not_to eq(tag.id)
-      expect(json.fetch('wiki_page_body')).to eq('independent body')
-      expect(json.fetch('tag').fetch('has_wiki')).to be(true)
-    end
-
-    it 'returns nil when only legacy Wiki content exists' do
-      seed_wiki_page(tag_name: tag.tag_name('ja'), body: 'legacy only',
-                     created_by_user: member_user)
-      TagDescription.where(tag_id: tag.id).delete_all
-      get_material_without_legacy_reads
-      expect(json.fetch('wiki_page_body')).to be_nil
-      expect(json.fetch('tag').fetch('has_wiki')).to be(false)
-    end
-
-    it 'returns nil for an untagged material' do
-      material.update!(tag: nil)
-      get_material_without_legacy_reads
-      expect(json.fetch('wiki_page_body')).to be_nil
-    end
   end
 
   describe 'POST /materials' do

backend/spec/requests/tag_description_wiki_spec.rb

@@ -1,277 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag description Wiki compatibility', type: :request do
-  include WikiRecords
-  let!(:user) { create_member_user! }
-  let!(:tag_name) { create(:tag_name, name: 'description_contract') }
-  let!(:page) do
-    seed_wiki_page(
-        tag_name:, body: 'old-revision', created_by_user: user)
-  end
-  let!(:revisions) do
-    first = page.current_revision
-    second = Wiki::Commit.legacy_content!(page:, body: 'old-second', created_user: user)
-    third = Wiki::Commit.legacy_content!(page:, body: 'old-third', created_user: user)
-    [first, second, third]
-  end
-  let!(:tag) { create(:tag, primary_tag_name: tag_name) }
-  let!(:versions) do
-    revisions.each_with_index.map do |revision, index|
-      TagDescriptionVersion.create!(
-          id: revision.id, tag_id: tag.id, language_code: 'ja',
-          version_no: index + 1, event_type: index.zero? ? 'create' : 'update',
-          body: index == 2 ? 'new-version' : 'A',
-          created_by_user_id: user.id, created_at: revision.created_at)
-    end
-  end
-  let!(:description) do
-    TagDescription.create!(
-        id: page.id, tag:, language_code: 'ja', version_no: 3, body: 'new',
-        created_by_user_id: user.id, updated_by_user_id: user.id)
-  end
-
-  before { page.update_columns(body: 'old') }
-
-  # Observe real SELECTs, including cached queries, only during the request.
-  def without_legacy_reads
-    queries = []
-    subscriber = lambda do |*args|
-      sql = args.last.fetch(:sql)
-      if sql.match?(/\bSELECT\b/i) && sql.match?(/\bwiki_(pages|revisions|versions)\b/i)
-        queries << sql
-      end
-    end
-    ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') { yield }
-    expect(queries).to be_empty
-  end
-
-  describe 'show' do
-    it 'uses current content and revision identity without legacy reads' do
-      without_legacy_reads { get "/wiki/#{ description.id }" }
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('body' => 'new', 'revision_id' => versions.last.id,
-                             'pred' => versions.second.id, 'succ' => nil)
-    end
-
-    [0, 1, 2].each do |index|
-      it "navigates displayed version #{ index + 1 }, preserving repeated bodies" do
-        without_legacy_reads do
-          get "/wiki/#{ description.id }", params: { version: versions[index].id }
-        end
-        expect(response).to have_http_status(:ok)
-        expect(json).to include(
-            'body' => versions[index].body,
-            'revision_id' => versions[index].id,
-            'pred' => index.zero? ? nil : versions[index - 1].id,
-            'succ' => index == 2 ? nil : versions[index + 1].id)
-      end
-    end
-
-    it 'does not fall back to a revision absent from new history' do
-      versions.first.destroy!
-      without_legacy_reads do
-        get "/wiki/#{ description.id }", params: { version: revisions.first.id }
-      end
-      expect(response).to have_http_status(:not_found)
-    end
-
-    it 'does not fall back when the new current revision is missing' do
-      versions.last.destroy!
-      without_legacy_reads { get "/wiki/#{ description.id }" }
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  describe 'revision resource scope' do
-    let!(:other_tag) { create(:tag, primary_name: 'other_description_contract') }
-    let!(:other_version) do
-      TagDescriptionVersion.create!(
-          tag_id: other_tag.id, language_code: 'ja', version_no: 1,
-          event_type: 'create', body: 'other tag history',
-          created_by_user_id: user.id, created_at: Time.current)
-    end
-    let!(:other_description) do
-      TagDescription.create!(
-          tag: other_tag, language_code: 'ja', version_no: 1, body: 'other tag history',
-          created_by_user_id: user.id, updated_by_user_id: user.id)
-    end
-
-    it 'returns 404 when show specifies another tag description version' do
-      get "/wiki/#{ description.id }", params: { version: other_version.id }
-      expect(response).to have_http_status(:not_found)
-      expect(response.body).not_to include(other_version.body)
-    end
-
-    it 'returns 404 when diff from belongs to another tag description' do
-      get "/wiki/#{ description.id }/diff",
-          params: { from: other_version.id, to: versions.last.id }
-      expect(response).to have_http_status(:not_found)
-      expect(response.body).not_to include(other_version.body)
-    end
-
-    it 'returns 404 when diff to belongs to another tag description' do
-      get "/wiki/#{ description.id }/diff",
-          params: { from: versions.first.id, to: other_version.id }
-      expect(response).to have_http_status(:not_found)
-      expect(response.body).not_to include(other_version.body)
-    end
-  end
-
-  describe 'show_by_title' do
-    it 'resolves TagName and reads current content from new tables' do
-      without_legacy_reads { get "/wiki/title/#{ tag_name.name }" }
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('id' => description.id, 'body' => 'new',
-                             'revision_id' => versions.last.id)
-    end
-
-    it 'uses historical content and navigation from the new history' do
-      get "/wiki/title/#{ tag_name.name }", params: { version: versions.second.id }
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('body' => 'A', 'revision_id' => versions.second.id,
-                             'pred' => versions.first.id, 'succ' => versions.last.id)
-    end
-
-    it 'ignores changes to same-title legacy content and revision metadata' do
-      get "/wiki/title/#{ tag_name.name }"
-      original = json
-      page.update_columns(body: 'changed legacy body')
-      revisions.last.update_columns(message: 'legacy message', created_at: 1.day.ago)
-      revisions.last.wiki_lines.update_all(body: 'changed legacy revision')
-      get "/wiki/title/#{ tag_name.name }"
-      expect(json).to eq(original)
-      expect(json.fetch('body')).to eq('new')
-    end
-  end
-
-  describe 'exists' do
-    it 'recognises an ID without reading legacy tables' do
-      without_legacy_reads { get "/wiki/#{ description.id }/exists" }
-      expect(response).to have_http_status(:no_content)
-    end
-
-    it 'recognises a title without reading legacy tables' do
-      without_legacy_reads { get "/wiki/title/#{ tag_name.name }/exists" }
-      expect(response).to have_http_status(:no_content)
-    end
-
-    context 'without a legacy page' do
-      before do
-        WikiVersion.where(wiki_page_id: page.id).delete_all
-        page.destroy!
-      end
-
-      it 'recognises the description ID alone' do
-        get "/wiki/#{ description.id }/exists"
-        expect(response).to have_http_status(:no_content)
-      end
-
-      it 'recognises the TagName alone' do
-        get "/wiki/title/#{ tag_name.name }/exists"
-        expect(response).to have_http_status(:no_content)
-      end
-
-      it 'shows the description by title' do
-        get "/wiki/title/#{ tag_name.name }"
-        expect(response).to have_http_status(:ok)
-        expect(json).to include('body' => 'new', 'revision_id' => versions.last.id)
-      end
-    end
-  end
-
-  describe 'diff' do
-    [false, true].each do |current|
-      it "uses new bodies with #{ current ? 'implicit current' : 'explicit to' }" do
-        params = { from: versions.first.id }
-        params[:to] = versions.last.id unless current
-        get "/wiki/#{ description.id }/diff", params: params
-        expect(response).to have_http_status(:ok)
-        expect(json).to include(
-            'wiki_page_id' => description.id,
-            'older_revision_id' => versions.first.id,
-            'newer_revision_id' => versions.last.id,
-            'diff' => [{ 'type' => 'removed', 'content' => 'A' },
-                       { 'type' => 'added', 'content' => 'new-version' }])
-      end
-    end
-
-    it 'does not query legacy tables for diff' do
-      without_legacy_reads do
-        get "/wiki/#{ description.id }/diff",
-            params: { from: versions.first.id, to: versions.last.id }
-      end
-      expect(response).to have_http_status(:ok)
-    end
-
-    it 'keeps distinct revision IDs for identical consecutive bodies' do
-      get "/wiki/#{ description.id }/diff",
-          params: { from: versions.first.id, to: versions.second.id }
-      expect(response).to have_http_status(:ok)
-      expect(json).to include(
-          'older_revision_id' => versions.first.id,
-          'newer_revision_id' => versions.second.id,
-          'diff' => [{ 'type' => 'context', 'content' => 'A' }])
-    end
-  end
-
-  describe 'changes' do
-    it 'lists every new version including consecutive identical bodies' do
-      without_legacy_reads { get '/wiki/changes', params: { id: description.id } }
-      expect(response).to have_http_status(:ok)
-      expect(json.map { |row| row.fetch('revision_id') }).to eq(versions.reverse.map(&:id))
-      expect(json.first.keys).to match_array(
-          ['revision_id', 'pred', 'succ', 'wiki_page', 'user', 'kind', 'message', 'timestamp'])
-      expect(json.first).to include(
-          'pred' => versions.second.id, 'succ' => nil, 'kind' => 'content',
-          'timestamp' => versions.last.created_at.iso8601(3),
-          'user' => { 'id' => user.id, 'name' => user.name })
-      expect(json.first.fetch('wiki_page')).to include('id' => description.id,
-                                                      'title' => tag_name.name)
-    end
-
-    it 'ignores legacy-only revisions and metadata changes' do
-      get '/wiki/changes', params: { id: description.id }
-      original = json
-      revisions.first.update_columns(message: 'legacy changed', created_at: 1.day.ago)
-      WikiRevision.create!(
-          wiki_page: page, created_user: user, kind: :content,
-          tree_sha256: Digest::SHA256.hexdigest('legacy only'), lines_count: 0)
-      get '/wiki/changes', params: { id: description.id }
-      expect(json).to eq(original)
-      expect(json.map { |row| row.fetch('revision_id') }).to eq(versions.reverse.map(&:id))
-    end
-  end
-
-  describe 'mixed changes' do
-    it 'excludes unmigrated history and migrated legacy-only revisions' do
-      legacy_page = seed_wiki_page(
-          tag_name: create(:tag_name, name: 'Help_mixed'),
-          body: 'help', created_by_user: user)
-      legacy_revision = legacy_page.current_revision
-      extra = WikiRevision.create!(
-          wiki_page: page, created_user: user, kind: :content,
-          tree_sha256: Digest::SHA256.hexdigest('legacy only'), lines_count: 0)
-
-      get '/wiki/changes'
-      expect(response).to have_http_status(:ok)
-      migrated = json.select { |row| row.fetch('wiki_page').fetch('id') == description.id }
-      expect(migrated.map { |row| row.fetch('revision_id') }).to eq(versions.reverse.map(&:id))
-      expect(json.map { |row| row.fetch('revision_id') }).not_to include(extra.id)
-      expect(json).not_to include(include(
-          'revision_id' => legacy_revision.id,
-          'wiki_page' => include('id' => legacy_page.id, 'title' => 'Help_mixed')))
-    end
-  end
-
-  describe 'index' do
-    [nil, 'description_contract'].each do |title|
-      it "returns new content once in #{ title ? 'filtered' : 'unfiltered' } index" do
-        get '/wiki', params: { title: }
-        expect(response).to have_http_status(:ok)
-        rows = json.select { |row| row.fetch('id') == description.id }
-        expect(rows.size).to eq(1)
-        expect(rows.first).to include('body' => 'new', 'title' => tag_name.name)
-      end
-    end
-  end
-end

backend/spec/requests/tag_description_wiki_write_spec.rb

@@ -1,281 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag description Wiki dual writes', type: :request do
-  include WikiRecords
-  let!(:user) { create_member_user! }
-  let!(:tag_name) { create(:tag_name, name: 'description_write') }
-  let(:tag) { create(:tag, primary_tag_name: tag_name) }
-  let(:headers) { { 'X-Transfer-Code' => user.inheritance_code } }
-
-  def stored_state
-    [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion,
-     TagName, TagVersion].map do |model|
-      model.order(:id).map(&:attributes)
-    end
-  end
-
-  # Fail after a real INSERT/UPDATE, exercising rollback rather than a mock write.
-  def fail_save model
-    failure = Class.new(StandardError)
-    callback = ->(_record) { raise failure, 'injected persistence failure' }
-    model.set_callback(:save, :after, callback)
-    expect { yield }.to raise_error(failure)
-  ensure
-    model.skip_callback(:save, :after, callback)
-  end
-
-  describe 'POST /wiki' do
-    before { tag }
-
-    def create_description
-      post '/wiki', params: { title: tag_name.name, body: 'initial', message: 'create' },
-           headers: headers
-    end
-
-    it 'creates a description with matching Wiki content and histories' do
-      expect { create_description }
-          .to change(WikiPage, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-          .and change(TagDescription, :count).by(1)
-          .and change(TagDescriptionVersion, :count).by(1)
-      expect(response).to have_http_status(:created)
-      description = TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-      expect(description).to have_attributes(body: 'initial', version_no: 1)
-      page = WikiPage.find_by!(tag_name:)
-      expect(page.body).to eq(description.body)
-      expect(page.current_revision.body).to eq(description.body)
-      expect(page.wiki_versions.sole.body).to eq(description.body)
-      expect(json.fetch('id')).to eq(description.id)
-      expect(TagDescriptionVersion.find_by!(tag_id: tag.id, language_code: 'ja'))
-          .to have_attributes(body: 'initial', version_no: 1, created_by_user_id: user.id)
-    end
-
-    it 'reuses an existing compatibility page and synchronises its histories' do
-      page = Wiki::Commit.create_legacy_content!(
-          tag_name:, body: 'legacy', created_by_user: user)
-      expect { create_description }
-          .to change(WikiPage, :count).by(0)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-      expect(response).to have_http_status(:created)
-      description = TagDescription.find_by!(tag_id: tag.id)
-      expect(page.reload.body).to eq(description.body)
-      expect(TagDescriptionVersion.find(page.current_revision.id).body).to eq(page.body)
-    end
-
-    ['missing_description', 'orphan_description'].each do |title|
-      it "rejects the bare title #{ title } without writing any resource" do
-        create(:tag_name, name: title) if title == 'orphan_description'
-        before_state = stored_state
-
-        post '/wiki', params: { title:, body: 'initial' }, headers: headers
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json).to include('type' => 'validation_error')
-        expect(stored_state).to eq(before_state)
-      end
-    end
-
-    [false, true].each do |linked|
-      it "rejects namespaced creation with Tag present: #{ linked }" do
-        name = create(:tag_name, name: 'Help:frozen')
-        create(:tag, primary_tag_name: name) if linked
-        before_state = stored_state
-        post '/wiki', params: { title: name.name, body: 'legacy' }, headers: headers
-        expect(response.status).to be_between(400, 499)
-        expect(stored_state).to eq(before_state)
-      end
-    end
-
-    [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion].each do |model|
-      it "rolls back new description creation when #{ model.name } persistence fails" do
-        before_state = stored_state
-        aggregate_failures do
-          fail_save(model) { create_description }
-          expect(stored_state).to eq(before_state)
-        end
-      end
-    end
-  end
-
-  it 'creates missing compatibility data without writing an ID-colliding Help page' do
-    description = TagDescription.create!(
-        id: 500, tag:, language_code: 'ja', body: 'before', version_no: 1)
-    help = WikiPage.create!(id: description.id,
-                            tag_name: create(:tag_name, name: 'Help:unrelated'),
-                            body: 'unrelated', created_user: user, updated_user: user)
-    Wiki::Commit.legacy_content!(page: help, body: help.body, created_user: user)
-    before_help = help.attributes
-    expect do
-      put "/wiki/#{ description.id }", params: { title: tag_name.name, body: 'after' },
-          headers: headers
-    end.to change(WikiPage, :count).by(1)
-        .and change(WikiRevision, :count).by(1)
-        .and change(WikiVersion, :count).by(1)
-    expect(response).to have_http_status(:ok)
-    expect(description.reload).to have_attributes(id: 500, body: 'after')
-    expect(help.reload.attributes).to eq(before_help)
-    compatibility = WikiPage.find_by!(tag_name:)
-    expect(compatibility.body).to eq(description.body)
-    expect(compatibility.current_revision.body).to eq(description.body)
-  end
-
-  describe 'PUT /wiki/:id' do
-    let!(:page) do
-      tag
-      seed_wiki_page(
-          tag_name:, body: 'before', created_by_user: user)
-    end
-    let!(:first_revision) { page.current_revision }
-
-    let!(:description) do
-      TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-    end
-
-    def update_description body: 'after', title: tag_name.name, base: first_revision.id
-      put "/wiki/#{ page.id }",
-          params: { title:, body:, message: 'edit', base_revision_id: base },
-          headers: headers
-    end
-
-    it 'increments the independent description sequence and shares revision identity' do
-      expect(page.reload.version_no).to eq(1)
-      expect(description.version_no).to eq(1)
-      expect { update_description }
-          .to change(WikiPage, :count).by(0)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-          .and change(TagDescriptionVersion, :count).by(1)
-      expect(response).to have_http_status(:ok)
-
-      revision = page.reload.current_revision
-      version = TagDescriptionVersion.find(revision.id)
-      expect(description.reload).to have_attributes(body: 'after', version_no: 2)
-      expect(version).to have_attributes(
-          body: 'after', version_no: 2, event_type: 'update', created_by_user_id: user.id)
-      expect(page).to have_attributes(body: 'after', version_no: 2)
-      expect(revision.body).to eq(version.body)
-      expect(page.wiki_versions.order(:version_no).last.body).to eq(version.body)
-    end
-
-    it 'uses description identity even when its Wiki TagName no longer owns the Tag' do
-      tag_name.update_columns(tag_id: nil)
-
-      expect { update_description }
-          .to change(WikiPage, :count).by(0)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-          .and change(TagDescriptionVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(description.reload).to have_attributes(body: 'after', version_no: 2)
-      expect(TagDescriptionVersion.find(page.reload.current_revision.id))
-          .to have_attributes(tag_id: tag.id, body: 'after', version_no: 2)
-    end
-
-    it 'does not add body history for a title-only update' do
-      revision_count = WikiRevision.count
-      wiki_version_count = WikiVersion.count
-      description_version_count = TagDescriptionVersion.count
-      wiki_version_no = page.reload.version_no
-      description_version_no = description.version_no
-      current_revision_id = page.current_revision.id
-      page_state = page.attributes
-      description_state = description.attributes
-
-      update_description(body: 'before', title: 'description_renamed')
-
-      expect(response).to have_http_status(:ok)
-      expect(tag_name.reload.name).to eq('description_renamed')
-      expect(WikiRevision.count).to eq(revision_count)
-      expect(WikiVersion.count).to eq(wiki_version_count)
-      expect(TagDescriptionVersion.count).to eq(description_version_count)
-      expect(page.reload).to have_attributes(body: 'before', version_no: wiki_version_no)
-      expect(page.current_revision.id).to eq(current_revision_id)
-      expect(page.reload.attributes).to eq(page_state)
-      expect(description.reload).to have_attributes(
-          body: 'before', version_no: description_version_no)
-      expect(description.reload.attributes).to eq(description_state)
-    end
-
-    it 'does not add body history for a TagName rename through tags' do
-      revision_count = WikiRevision.count
-      wiki_version_count = WikiVersion.count
-      description_version_count = TagDescriptionVersion.count
-      page_version_no = page.reload.version_no
-      current_revision_id = page.current_revision.id
-
-      patch "/tags/#{ tag.id }",
-            params: { name: 'description_tag_renamed' },
-            headers: headers
-
-      expect(response).to have_http_status(:ok)
-      expect(tag_name.reload.name).to eq('description_tag_renamed')
-      expect(WikiRevision.count).to eq(revision_count)
-      expect(WikiVersion.count).to eq(wiki_version_count)
-      expect(TagDescriptionVersion.count).to eq(description_version_count)
-      expect(page.reload.version_no).to eq(page_version_no)
-      expect(page.current_revision.id).to eq(current_revision_id)
-      expect(description.reload).to have_attributes(
-          body: 'before', version_no: 1)
-    end
-
-    it 'keeps both systems and the title unchanged on a stale revision conflict' do
-      update_description(body: 'current body', base: first_revision.id)
-      expect(response).to have_http_status(:ok)
-
-      stale_revision_id = first_revision.id
-      before_state = stored_state
-
-      update_description(
-          body: 'conflicting body',
-          title: 'conflicting_rename',
-          base: stale_revision_id)
-
-      expect(response).to have_http_status(:conflict)
-      expect(stored_state).to eq(before_state)
-      expect(tag_name.reload.name).not_to eq('conflicting_rename')
-    end
-
-    [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion].each do |model|
-      it "rolls back both systems when #{ model.name } persistence fails" do
-        before_state = stored_state
-        aggregate_failures do
-          fail_save(model) do
-            update_description(body: 'rollback body', title: 'rollback_rename')
-          end
-          expect(stored_state).to eq(before_state)
-        end
-      end
-    end
-
-    [['identical body', 'before'],
-     ['normalised-equivalent body', "before\n\n"]].each do |label, body|
-      it "does not write histories for #{ label }" do
-        before_state = stored_state
-        page_state = page.reload.attributes
-        description_state = description.reload.attributes
-        current_revision_id = page.current_revision.id
-        wiki_lines = WikiLine.order(:id).map(&:attributes)
-        revision_lines = WikiRevisionLine.order(:id).map(&:attributes)
-        page_version_no = page.version_no
-        description_version_no = description.version_no
-
-        update_description(body:)
-
-        expect(response).to have_http_status(:ok)
-        expect(WikiRevision.count).to eq(before_state[1].length)
-        expect(WikiVersion.count).to eq(before_state[2].length)
-        expect(TagDescriptionVersion.count).to eq(before_state[4].length)
-        expect(page.reload.version_no).to eq(page_version_no)
-        expect(description.reload.version_no).to eq(description_version_no)
-        expect(page.current_revision.id).to eq(current_revision_id)
-        expect(page.reload.attributes).to eq(page_state)
-        expect(description.reload.attributes).to eq(description_state)
-        expect(WikiLine.order(:id).map(&:attributes)).to eq(wiki_lines)
-        expect(WikiRevisionLine.order(:id).map(&:attributes)).to eq(revision_lines)
-      end
-    end
-  end
-end

backend/spec/requests/tag_descriptions_spec.rb

@@ -1,368 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag description native API', type: :request do
-  let!(:author) { create_member_user! }
-  let(:editor) { create(:user, :member, name: 'description editor') }
-  let(:tag_name) { create(:tag_name, name: 'native_description') }
-  let(:tag) { create(:tag, primary_tag_name: tag_name) }
-  let(:headers) { { 'X-Transfer-Code' => editor.inheritance_code } }
-  let(:endpoint) { "/tags/#{ tag.id }/description" }
-
-  def stored_state
-    [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion,
-     WikiLine, WikiRevisionLine, TagName, TagVersion].map do |model|
-      model.order(:id).map(&:attributes)
-    end
-  end
-
-  def fail_save model
-    failure = Class.new(StandardError)
-    callback = ->(_record) { raise failure, 'injected persistence failure' }
-    model.set_callback(:save, :after, callback)
-    expect { yield }.to raise_error(failure)
-  ensure
-    model.skip_callback(:save, :after, callback)
-  end
-
-  def without_legacy_reads
-    queries = []
-    subscriber = lambda do |*args|
-      sql = args.last.fetch(:sql)
-      if sql.match?(/\bSELECT\b/i) && sql.match?(/\bwiki_(pages|revisions|versions)\b/i)
-        queries << sql
-      end
-    end
-    ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') { yield }
-    expect(queries).to be_empty
-  end
-
-  def native_get path, action: 'show'
-    get path
-    # A missing route must not make the resource-not-found examples pass.
-    expect(request.path_parameters).to include(controller: 'tag_descriptions', action:)
-  end
-
-  def native_write body:, request_headers: headers
-    put endpoint, params: { body: }, headers: request_headers
-    expect(request.path_parameters).to include(
-        controller: 'tag_descriptions', action: 'update')
-  end
-
-  def expect_current description
-    expect(json).to include(
-        'tag_id' => description.tag_id,
-        'language_code' => 'ja', 'body' => description.body,
-        'version_no' => description.version_no,
-        'created_by_user_id' => description.created_by_user_id,
-        'updated_by_user_id' => description.updated_by_user_id,
-        'created_at' => description.created_at.iso8601(3),
-        'updated_at' => description.updated_at.iso8601(3))
-    expect(json.keys).not_to include('title', 'name', 'wiki_page', 'tag_name_id')
-  end
-
-  describe 'routing', type: :routing do
-    it 'routes GET by Tag ID to show' do
-      expect(get: '/tags/123/description').to route_to(
-          controller: 'tag_descriptions', action: 'show', id: '123')
-    end
-
-    it 'routes GET by TagName to show_by_title' do
-      expect(get: '/tags/name/native_description/description').to route_to(
-          controller: 'tag_descriptions', action: 'show_by_title', name: 'native_description')
-    end
-
-    it 'does not route POST by Tag ID' do
-      expect(post: '/tags/123/description').not_to be_routable
-    end
-
-    it 'routes PUT by Tag ID to update' do
-      expect(put: '/tags/123/description').to route_to(
-          controller: 'tag_descriptions', action: 'update', id: '123')
-    end
-  end
-
-  describe 'native reads' do
-    let!(:description) do
-      TagDescription.create!(
-          id: tag.id + 1_000_000, tag:, language_code: 'ja', body: 'native current',
-          version_no: 1, created_by_user_id: author.id, updated_by_user_id: editor.id)
-    end
-    let!(:version) do
-      TagDescriptionVersion.create!(
-          tag_id: tag.id, language_code: 'ja', body: 'native version', version_no: 1,
-          event_type: 'create', created_by_user_id: author.id, created_at: Time.current)
-    end
-    let(:name_endpoint) { "/tags/name/#{ tag_name.name }/description" }
-
-    it 'reads the current resource by Tag ID without a WikiPage' do
-      expect(description.id).not_to eq(tag.id)
-      expect(WikiPage.exists?(id: description.id)).to be(false)
-      without_legacy_reads { native_get(endpoint) }
-      expect(response).to have_http_status(:ok)
-      expect_current(description)
-    end
-
-    it 'does not interpret a compatibility handle as a Tag ID' do
-      other_tag = create(:tag, id: description.id, primary_name: 'handle_collision')
-      other = TagDescription.create!(
-          tag: other_tag, language_code: 'ja', body: 'other current', version_no: 1,
-          created_by_user_id: author.id, updated_by_user_id: author.id)
-      without_legacy_reads { native_get("/tags/#{ other_tag.id }/description") }
-      expect(response).to have_http_status(:ok)
-      expect_current(other)
-    end
-
-    context 'with another language for the same Tag' do
-      before do
-        # Seed only the reference row; V1 does not enable an English locale.
-        Language.connection.execute(<<~SQL)
-          INSERT IGNORE INTO languages (code, name, created_at)
-          VALUES ('en', 'English', CURRENT_TIMESTAMP)
-        SQL
-      end
-
-      it 'selects the Japanese resource' do
-        TagDescription.create!(
-            tag:, language_code: 'en', body: 'English current', version_no: 4,
-            created_by_user_id: author.id, updated_by_user_id: author.id)
-        without_legacy_reads { native_get(endpoint) }
-        expect(response).to have_http_status(:ok)
-        expect_current(description)
-      end
-
-      it 'returns 404 if only the English description exists' do
-        description.update!(language_code: 'en')
-        without_legacy_reads { native_get(endpoint) }
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    it 'resolves the primary Japanese TagName without a WikiPage' do
-      without_legacy_reads { native_get(name_endpoint, action: 'show_by_title') }
-      expect(response).to have_http_status(:ok)
-      expect_current(description)
-    end
-
-    it 'resolves an alias through the existing TagName canonicalisation semantics' do
-      alias_name = create(:tag_name, :alias, tag:, name: 'native_alias')
-      expect(TagName.canonicalise(Locale.nipponese, [alias_name.name])).to eq([tag_name.name])
-      without_legacy_reads do
-        native_get("/tags/name/#{ alias_name.name }/description", action: 'show_by_title')
-      end
-      expect(response).to have_http_status(:ok)
-      expect_current(description)
-    end
-
-    [:id, :name].each do |lookup|
-      it "ignores divergent legacy body and history for #{ lookup } lookup" do
-        page = WikiPage.create!(
-            id: description.id, tag_name:, body: 'old current',
-            created_user: author, updated_user: author)
-        revision = WikiRevision.create!(
-            wiki_page: page, created_user: author, kind: :content,
-            lines_count: 1, tree_sha256: Digest::SHA256.hexdigest('old revision'))
-        line = WikiLine.create!(body: 'old revision', sha256: revision.tree_sha256)
-        WikiRevisionLine.create!(wiki_revision: revision, wiki_line: line, position: 0)
-        WikiVersionRecorder.record!(page:, event_type: :create, created_by_user: author)
-        path = lookup == :id ? endpoint : name_endpoint
-        action = lookup == :id ? 'show' : 'show_by_title'
-
-        without_legacy_reads { native_get(path, action:) }
-        expect(response).to have_http_status(:ok)
-        expect_current(description)
-        original = json
-        page.update_columns(body: 'changed old current')
-        line.update_columns(body: 'changed old revision')
-        revision.update_columns(message: 'changed old history', created_at: 1.day.ago)
-        without_legacy_reads { native_get(path, action:) }
-        expect(response).to have_http_status(:ok)
-        expect(json).to eq(original)
-      end
-    end
-  end
-
-  describe 'missing native resources' do
-    it 'returns 404 for a Tag without a description' do
-      without_legacy_reads { native_get(endpoint) }
-      expect(response).to have_http_status(:not_found)
-    end
-
-    it 'returns 404 for a primary name without a description' do
-      tag
-      without_legacy_reads do
-        native_get("/tags/name/#{ tag_name.name }/description", action: 'show_by_title')
-      end
-      expect(response).to have_http_status(:not_found)
-    end
-
-    it 'returns 404 for a missing Tag' do
-      missing_id = Tag.maximum(:id).to_i + 1
-      without_legacy_reads { native_get("/tags/#{ missing_id }/description") }
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  describe 'PUT /tags/:id/description' do
-    context 'without an existing description' do
-      before { tag }
-
-      it 'creates a description with synchronised Wiki content and histories' do
-        unrelated = Wiki::Commit.create_legacy_content!(
-            tag_name: create(:tag_name, name: 'Help:unrelated_native_description'),
-            body: 'unrelated body', created_by_user: author)
-        unrelated_state = [unrelated.attributes,
-                           unrelated.wiki_revisions.map(&:attributes),
-                           unrelated.wiki_versions.map(&:attributes)]
-        expect { native_write(body: 'created natively') }
-            .to change(TagDescription, :count).by(1)
-            .and change(TagDescriptionVersion, :count).by(1)
-            .and change(WikiPage, :count).by(1)
-            .and change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-        expect(response).to have_http_status(:created)
-        description = TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-        page = WikiPage.find_by!(tag_name: tag.tag_name('ja'))
-        revision = page.current_revision
-        version = TagDescriptionVersion.find(revision.id)
-        expect(description).to have_attributes(
-            body: 'created natively', version_no: 1,
-            created_by_user_id: editor.id, updated_by_user_id: editor.id)
-        expect(version).to have_attributes(
-            tag_id: tag.id, language_code: 'ja', body: description.body,
-            version_no: 1, event_type: 'create', created_by_user_id: editor.id)
-        expect(page).to have_attributes(tag_name_id: tag_name.id, body: description.body)
-        expect(revision.body).to eq(version.body)
-        expect(page.wiki_versions.last.body).to eq(version.body)
-        unrelated.reload
-        expect([unrelated.attributes, unrelated.wiki_revisions.map(&:attributes),
-                unrelated.wiki_versions.map(&:attributes)]).to eq(unrelated_state)
-        expect_current(description)
-
-        get "/wiki/#{ description.id }"
-        expect(response).to have_http_status(:ok)
-        expect(json).to include('body' => description.body, 'revision_id' => version.id)
-      end
-
-      [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion].each do |model|
-        it "rolls back native create when #{ model.name } persistence fails" do
-          headers
-          before_state = stored_state
-          aggregate_failures do
-            fail_save(model) { native_write(body: 'rollback create') }
-            expect(stored_state).to eq(before_state)
-          end
-        end
-      end
-    end
-
-    context 'with an existing description' do
-      let!(:page) do
-        tag
-        Wiki::Commit.create_content!(tag_name:, body: 'before', created_by_user: author)
-      end
-      let!(:description) do
-        TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-      end
-
-      it 'writes matching histories when the body changes' do
-        expect(page.reload.version_no).to eq(1)
-        expect(description.version_no).to eq(1)
-        expect { native_write(body: 'after') }
-            .to change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-            .and change(TagDescriptionVersion, :count).by(1)
-        expect(response).to have_http_status(:ok)
-        expect(description.reload).to have_attributes(
-            body: 'after', version_no: 2,
-            created_by_user_id: author.id, updated_by_user_id: editor.id)
-        expect(page.reload).to have_attributes(body: 'after', version_no: 2)
-
-        revision = page.current_revision
-        version = TagDescriptionVersion.find(revision.id)
-        expect(version).to have_attributes(
-            tag_id: tag.id, language_code: 'ja', version_no: 2, event_type: 'update',
-            body: 'after', created_by_user_id: editor.id)
-        expect(revision.body).to eq(version.body)
-        expect(page.wiki_versions.order(:version_no).last.body).to eq(version.body)
-        get "/wiki/#{ description.id }"
-        expect(response).to have_http_status(:ok)
-        expect(json).to include('body' => 'after', 'revision_id' => version.id)
-      end
-
-      ['before', "before\n\n"].each do |body|
-        it 'does not write histories when the normalised body is unchanged' do
-          before_state = stored_state
-          page_state = page.reload.attributes
-          description_state = description.reload.attributes
-          current_revision_id = page.current_revision.id
-
-          native_write(body:)
-
-          expect(response).to have_http_status(:ok)
-          expect(stored_state).to eq(before_state)
-          expect(page.reload.attributes).to eq(page_state)
-          expect(description.reload.attributes).to eq(description_state)
-          expect(page.current_revision.id).to eq(current_revision_id)
-        end
-      end
-
-      [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion].each do |model|
-        it "rolls back native update when #{ model.name } persistence fails" do
-          headers
-          before_state = stored_state
-          aggregate_failures do
-            fail_save(model) { native_write(body: 'rollback update') }
-            expect(stored_state).to eq(before_state)
-          end
-        end
-      end
-    end
-  end
-
-  describe 'write access and validation' do
-    before { tag }
-
-    it 'requires authentication without changing either system' do
-      before_state = stored_state
-      native_write(body: 'unauthorised', request_headers: { })
-      expect(response).to have_http_status(:unauthorized)
-      expect(stored_state).to eq(before_state)
-    end
-
-    it 'rejects a guest without changing either system' do
-      guest = create(:user, :guest)
-      before_state = stored_state
-      native_write(body: 'forbidden',
-                   request_headers: { 'X-Transfer-Code' => guest.inheritance_code })
-      expect(response).to have_http_status(:forbidden)
-      expect(stored_state).to eq(before_state)
-    end
-
-    it 'rejects a banned member without changing either system' do
-      banned = create(:user, :member, :banned)
-      before_state = stored_state
-      native_write(body: 'forbidden',
-                   request_headers: { 'X-Transfer-Code' => banned.inheritance_code })
-      expect(response).to have_http_status(:forbidden)
-      expect(stored_state).to eq(before_state)
-    end
-
-    it 'rejects blank body using the existing validation error format' do
-      headers
-      before_state = stored_state
-      native_write(body: '')
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json).to include('type' => 'validation_error',
-                             'errors' => include('body' => a_kind_of(Array)))
-      expect(stored_state).to eq(before_state)
-    end
-
-    it 'returns 404 when PUT targets a missing Tag' do
-      missing_id = Tag.maximum(:id).to_i + 1
-      put "/tags/#{ missing_id }/description",
-          params: { body: 'missing' },
-          headers: headers
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-end

backend/spec/requests/tag_group_markdown_spec.rb

@@ -1,139 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group Markdown round trips through the Wiki facade', type: :request do
-  include TagGroupRecords
-
-  let!(:user) { create_member_user! }
-  let!(:series) { group_tag('ぼざろクリーチャーシリーズ') }
-  let!(:deer) { group_tag('洗澡鹿') }
-  let!(:nizika) { group_tag('伊地知ニジカ') }
-  let!(:wanted) { group_tag('タグ希望') }
-  let!(:character) { group_tag('キャラクター名希望') }
-  let!(:music) { group_tag('楽曲情報希望') }
-  let!(:bot) { group_tag('bot操作') }
-  let!(:unknown) { group_tag('ニジラー情報不詳') }
-  let!(:child_id) { seed_group(name: '伊地知ニジカ亜種', description: '子の説明') }
-
-  before { I18n.locale = :ja }
-
-  def tag_node tag, children = []
-    { 'tag_id' => tag.id, 'children' => children }
-  end
-
-  def tag_member tag
-    { 'tag_id' => tag.id, 'version_no' => tag.version_no }
-  end
-
-  def check_round_trip placements:, members:, markdown:, description: nil
-    id = seed_group(name: '変換元', placements:, members:, description:)
-    without_group_legacy_reads { get group_title_path('変換元') }
-    expect(response).to have_http_status(:ok)
-    expect(json).to include('id' => id)
-    body = json.fetch('body')
-    expect(body).not_to include("\r")
-    expect(body.lines.map(&:chomp)).to all(satisfy { |line| line == line.rstrip })
-    # A trailing LF or a blank line between blocks is semantically irrelevant.
-    expect(body.lines.map(&:chomp).reject(&:empty?)).to eq(
-        markdown.lines.map(&:chomp).reject(&:empty?))
-
-    post '/wiki', params: { title: 'タググループ:再解析', body: },
-         headers: { 'X-Transfer-Code' => user.inheritance_code }
-    expect(response).to have_http_status(:created)
-    parsed = group_rows('tag_groups', name: '再解析').sole
-    expect_group_snapshot(parsed.fetch('id'), number: 1, placements:, members:, description:)
-  end
-
-  it 'renders a list Section under a Tag with two-space indentation' do
-    check_round_trip(
-        members: [series, deer].map { tag_member(_1) },
-        placements: [tag_node(series, [
-            { 'section_name' => '伊地知ニジカ亜種', 'description' => nil,
-              'children' => [tag_node(deer)] }])],
-        markdown: <<~MARKDOWN)
-          - ぼざろクリーチャーシリーズ
-            - 伊地知ニジカ亜種:
-              - 洗澡鹿
-        MARKDOWN
-  end
-
-  it 'renders a child Tag Group distinctly from its parent Tags' do
-    check_round_trip(
-        members: [tag_member(series), tag_member(nizika),
-                  { 'tag_group_id' => child_id, 'version_no' => 1 }],
-        placements: [tag_node(series, [tag_node(nizika, [
-            { 'tag_group_id' => child_id, 'children' => [] }])])],
-        markdown: <<~MARKDOWN)
-          - ぼざろクリーチャーシリーズ
-            - 伊地知ニジカ
-              - タググループ:伊地知ニジカ亜種
-        MARKDOWN
-  end
-
-  it 'renders top-level heading Sections, descriptions and ordered nested Tags' do
-    check_round_trip(
-        description: '全体の説明',
-        members: [wanted, character, music, bot, unknown].map { tag_member(_1) },
-        placements: [
-            { 'section_name' => '要求', 'description' => '要求の説明',
-              'children' => [tag_node(wanted, [tag_node(character), tag_node(music)])] },
-            { 'section_name' => '情報', 'description' => nil,
-              'children' => [tag_node(bot), tag_node(unknown)] }],
-        markdown: <<~MARKDOWN)
-          全体の説明
-
-          ## 要求
-          要求の説明
-
-          - タグ希望
-            - キャラクター名希望
-            - 楽曲情報希望
-
-          ## 情報
-          - bot操作
-          - ニジラー情報不詳
-        MARKDOWN
-  end
-
-  it 'renders nested heading Sections and all repeated Tag placements' do
-    check_round_trip(
-        members: [tag_member(deer)],
-        placements: [
-            { 'section_name' => '親', 'description' => '親の説明', 'children' => [
-                tag_node(deer),
-                { 'section_name' => '子', 'description' => '子の説明',
-                  'children' => [tag_node(deer)] }] }],
-        markdown: <<~MARKDOWN)
-          ## 親
-          親の説明
-
-          - 洗澡鹿
-
-          ### 子
-          子の説明
-
-          - 洗澡鹿
-        MARKDOWN
-  end
-
-  it 'rejects mixed top-level heading Sections and Tags without losing structure' do
-    id = seed_group(
-        name: '混在構造', members: [tag_member(series)],
-        placements: [
-            { 'section_name' => '区分', 'description' => nil, 'children' => [] },
-            tag_node(series)])
-
-    get group_title_path('混在構造')
-
-    expect(response).to have_http_status(:unprocessable_entity)
-    expect(group_rows('tag_groups', id:).sole.fetch('id')).to eq(id)
-  end
-
-  it 'rejects membership without a placement instead of omitting it' do
-    id = seed_group(name: '未配置構造', members: [tag_member(series)])
-
-    get group_title_path('未配置構造')
-
-    expect(response).to have_http_status(:unprocessable_entity)
-    expect(group_rows('tag_groups', id:).sole.fetch('id')).to eq(id)
-  end
-end

backend/spec/requests/tag_group_wiki_spec.rb

@@ -1,309 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group Wiki facade reads', type: :request do
-  include WikiRecords
-  include TagGroupRecords
-
-  let!(:user) { create_member_user! }
-  let!(:old_tag) { group_tag('旧タグ') }
-  let!(:new_tag) { group_tag('新タグ') }
-  let!(:page) { legacy_group('読取り契約', '- 旧タグ') }
-  let!(:first_revision) { page.current_revision }
-  let!(:last_revision) do
-    Wiki::Commit.legacy_content!(page:, body: '- 新タグ', created_user: user)
-  end
-
-  before do
-    I18n.locale = :ja
-    migrate_groups
-    page.update_columns(body: 'legacy stale current')
-    page.wiki_revisions.each do |revision|
-      revision.wiki_lines.update_all(body: 'legacy stale revision')
-    end
-    page.wiki_versions.update_all(body: 'legacy stale version')
-  end
-
-  [:id, :title].each do |lookup|
-    context "with #{ lookup } lookup" do
-      let(:path) { lookup == :id ? "/wiki/#{ page.id }" : group_title_path('読取り契約') }
-
-      it 'reads current structure without consulting migrated Wiki tables' do
-        without_group_legacy_reads { get path }
-        expect(response).to have_http_status(:ok)
-        expect(json).to include(
-            'id' => page.id, 'title' => 'タググループ:読取り契約',
-            'revision_id' => last_revision.id, 'pred' => first_revision.id, 'succ' => nil)
-        expect(json.fetch('body').strip).to eq('- 新タグ')
-      end
-
-      it 'reads the old snapshot rather than current membership or placement' do
-        without_group_legacy_reads { get path, params: { version: first_revision.id } }
-        expect(response).to have_http_status(:ok)
-        expect(json.fetch('body').strip).to eq('- 旧タグ')
-        expect(json).to include(
-            'revision_id' => first_revision.id, 'pred' => nil, 'succ' => last_revision.id,
-            'updated_at' => first_revision.created_at.iso8601(3))
-      end
-
-      it 'checks existence without consulting migrated Wiki tables' do
-        without_group_legacy_reads { get "#{ path }/exists" }
-        expect(response).to have_http_status(:no_content)
-      end
-
-      it 'does not fall back to legacy history when a group version is missing' do
-        group_connection.execute(
-            "DELETE FROM tag_group_versions WHERE id = #{ first_revision.id }")
-        without_group_legacy_reads { get path, params: { version: first_revision.id } }
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-  end
-
-  ['/wiki', '/wiki/search'].each do |path|
-    it "lists migrated groups once with current titles at #{ path }" do
-      get path, params: { title: 'タググループ:読取り' }
-      expect(response).to have_http_status(:ok)
-      rows = json.select { _1.fetch('title') == 'タググループ:読取り契約' }
-      expect(rows.size).to eq(1)
-      expect(rows.sole).to include('id' => page.id)
-      expect(response.body).not_to include('legacy stale')
-    end
-  end
-
-  it 'combines Tag Groups and Tag Descriptions without Help in the unfiltered list' do
-    help = seed_wiki_page(
-        tag_name: create(:tag_name, name: 'Help:混在'), body: 'help', created_by_user: user)
-    TagDescriptionOperation.create!(tag: new_tag, body: 'tag description', created_by_user: user)
-    get '/wiki'
-    expect(response).to have_http_status(:ok)
-    expect(json.map { _1.fetch('title') }).to include(
-        'タググループ:読取り契約', '新タグ')
-    expect(json.map { _1.fetch('title') }).not_to include(help.title)
-  end
-
-  it 'excludes Help when its ID collides with a new group' do
-    help = seed_wiki_page(
-        tag_name: create(:tag_name, name: 'Help:ID重複'), body: 'help body',
-        created_by_user: user)
-    seed_group(name: '別 ID重複', id: help.id, description: 'group body')
-
-    get '/wiki'
-    expect(response).to have_http_status(:ok)
-    expect(json.map { _1.fetch('title') }).to include('タググループ:別 ID重複')
-    expect(json.map { _1.fetch('title') }).not_to include(help.title)
-
-    get "/wiki/title/#{ CGI.escapeURIComponent(help.title) }"
-    expect(response).to have_http_status(:not_found)
-
-    get '/wiki/changes'
-    expect(response).to have_http_status(:ok)
-    expect(json.map { _1.dig('wiki_page', 'title') }).to include(
-        'タググループ:別 ID重複')
-    expect(json.map { _1.dig('wiki_page', 'title') }).not_to include(help.title)
-  end
-
-  it 'finds groups by a partial prefix of their displayed title' do
-    get '/wiki', params: { title: 'タググル' }
-
-    expect(response).to have_http_status(:ok)
-    expect(json.map { _1.fetch('title') }).to include('タググループ:読取り契約')
-    expect(json.find { _1.fetch('title') == 'タググループ:読取り契約' })
-        .to include('updated_at' => be_present)
-  end
-
-  it 'does not restore a stale namespaced Wiki page after a group rename' do
-    old_page = legacy_group('旧名称', '- 旧本文')
-    seed_group(name: '新名称', id: old_page.id, description: '正本')
-
-    get group_title_path('旧名称')
-    expect(response).to have_http_status(:not_found)
-    get "#{ group_title_path('旧名称') }/exists"
-    expect(response).to have_http_status(:not_found)
-    get group_title_path('新名称')
-    expect(response).to have_http_status(:ok)
-    expect(json.fetch('body').strip).to eq('正本')
-  end
-
-  it 'orders mixed resource history by timestamp rather than independent IDs' do
-    help = seed_wiki_page(
-        tag_name: create(:tag_name, name: 'Help:時系列'), body: 'help',
-        created_by_user: user)
-    TagDescriptionOperation.create!(tag: new_tag, body: 'description', created_by_user: user)
-    TagGroupVersion.update_all(created_at: 3.days.ago)
-    WikiRevision.where(wiki_page_id: help.id).update_all(created_at: 2.days.ago)
-    TagDescriptionVersion.update_all(created_at: 1.day.ago)
-
-    get '/wiki/changes'
-
-    expect(response).to have_http_status(:ok)
-    timestamps = json.map { Time.iso8601(_1.fetch('timestamp')) }
-    expect(timestamps).to eq(timestamps.sort.reverse)
-    titles = json.map { _1.dig('wiki_page', 'title') }
-    expect(titles).not_to include(help.title)
-    expect(titles.index('新タグ')).to be < titles.index('タググループ:読取り契約')
-  end
-
-  it 'renders nullable group editors without raising' do
-    group_connection.execute(
-        "UPDATE tag_groups SET created_by_user_id = NULL, updated_by_user_id = NULL " +
-        "WHERE id = #{ page.id }")
-    group_connection.execute(
-        "UPDATE tag_group_versions SET created_by_user_id = NULL " +
-        "WHERE tag_group_id = #{ page.id }")
-
-    get "/tag_groups/#{ page.id }"
-    expect(response).to have_http_status(:ok)
-    expect(json).to include('created_by_user' => nil, 'updated_by_user' => nil)
-    get "/wiki/title/#{ CGI.escapeURIComponent('タググループ:読取り契約') }"
-    expect(response).to have_http_status(:ok)
-  end
-
-  it 'reads group version IDs, editor and timestamps in scoped changes' do
-    without_group_legacy_reads { get '/wiki/changes', params: { id: page.id } }
-    expect(response).to have_http_status(:ok)
-    expect(json.map { _1.fetch('revision_id') }).to eq([last_revision.id, first_revision.id])
-    expect(json.first).to include(
-        'pred' => first_revision.id, 'succ' => nil, 'kind' => 'content',
-        'timestamp' => last_revision.created_at.iso8601(3),
-        'user' => { 'id' => user.id, 'name' => user.name },
-        'wiki_page' => include('id' => page.id, 'title' => 'タググループ:読取り契約'))
-  end
-
-  it 'includes group history but excludes all legacy-only revisions' do
-    extra = Wiki::Commit.legacy_content!(page:, body: 'legacy only', created_user: user)
-    help = seed_wiki_page(
-        tag_name: create(:tag_name, name: 'Help:変更一覧'), body: 'help', created_by_user: user)
-    get '/wiki/changes'
-    expect(response).to have_http_status(:ok)
-    rows = json.select { _1.fetch('wiki_page').fetch('title') == 'タググループ:読取り契約' }
-    expect(rows.map { _1.fetch('revision_id') }).to eq([last_revision.id, first_revision.id])
-    expect(rows.map { _1.fetch('revision_id') }).not_to include(extra.id)
-    expect(json).not_to include(include(
-        'revision_id' => help.current_revision.id,
-        'wiki_page' => include('title' => help.title)))
-  end
-
-  [false, true].each do |explicit|
-    it "diffs structured snapshots with #{ explicit ? 'explicit' : 'current' } target" do
-      params = { from: first_revision.id }
-      params[:to] = last_revision.id if explicit
-      without_group_legacy_reads { get "/wiki/#{ page.id }/diff", params: }
-      expect(response).to have_http_status(:ok)
-      expect(json).to include(
-          'wiki_page_id' => page.id, 'older_revision_id' => first_revision.id,
-          'newer_revision_id' => last_revision.id)
-      differences = json.fetch('diff').map { [_1.fetch('type'), _1.fetch('content').strip] }
-      expect(differences).to include(['removed', '- 旧タグ'], ['added', '- 新タグ'])
-    end
-  end
-
-  it 'does not use a version belonging to another group' do
-    other_id = seed_group(name: '別グループ', description: '別本文')
-    other_version = group_version(other_id, 1)
-    get group_title_path('読取り契約'), params: { version: other_version.fetch('id') }
-    expect(response).to have_http_status(:not_found)
-    get "/wiki/#{ page.id }/diff",
-        params: { from: other_version.fetch('id'), to: last_revision.id }
-    expect(response).to have_http_status(:not_found)
-  end
-
-  it 'resolves a group without any compatibility Wiki page' do
-    id = seed_group(name: '独立グループ', description: '独立した説明')
-    without_group_legacy_reads { get group_title_path('独立グループ') }
-    expect(response).to have_http_status(:ok)
-    expect(json).to include('id' => id, 'title' => 'タググループ:独立グループ')
-    expect(json.fetch('body').strip).to eq('独立した説明')
-  end
-
-  context 'when Help, description and group share the same numeric ID' do
-    let(:colliding_help) do
-      seed_wiki_page(
-          tag_name: create(:tag_name, name: 'Help:三者ID衝突'),
-          body: 'help', created_by_user: user)
-    end
-    let(:colliding_group_id) do
-      seed_group(name: '三者ID衝突', id: colliding_help.id, description: 'group')
-    end
-    let(:colliding_description) do
-      TagDescription.create!(
-          id: colliding_help.id, tag: new_tag, language_code: 'ja',
-          body: 'description', version_no: 1)
-    end
-    let(:colliding_description_version) do
-      TagDescriptionVersion.create!(
-          tag_id: new_tag.id, language_code: 'ja', version_no: 1,
-          event_type: 'create', body: 'description', created_by_user_id: user.id,
-          created_at: Time.current)
-    end
-
-    before do
-      colliding_group_id
-      colliding_description
-      colliding_description_version
-    end
-
-    it 'lists both new resources sharing a numeric ID without legacy Help' do
-      get '/wiki'
-
-      expect(response).to have_http_status(:ok)
-      rows = json.select { _1.fetch('id') == colliding_help.id }
-      expect(rows.map { [_1.fetch('id'), _1.fetch('title')] }).to contain_exactly(
-          [colliding_description.id, '新タグ'],
-          [colliding_group_id, 'タググループ:三者ID衝突'])
-    end
-
-    it 'lists each resource history without deduplicating the shared resource ID' do
-      get '/wiki/changes'
-
-      expect(response).to have_http_status(:ok)
-      rows = json.select { _1.fetch('wiki_page').fetch('id') == colliding_help.id }
-      histories = rows.map do |row|
-        [row.fetch('revision_id'), row.fetch('wiki_page').fetch('title')]
-      end
-      expect(histories).to contain_exactly(
-          [colliding_description_version.id, '新タグ'],
-          [group_version(colliding_group_id, 1).fetch('id'), 'タググループ:三者ID衝突'])
-    end
-
-    it 'still excludes legacy copies of an actually migrated group and its history' do
-      extra = Wiki::Commit.legacy_content!(page:, body: 'legacy only', created_user: user)
-
-      get '/wiki'
-
-      expect(response).to have_http_status(:ok)
-      rows = json.select { _1.fetch('id') == page.id }
-      expect(rows.map { _1.fetch('title') }).to eq(['タググループ:読取り契約'])
-
-      get '/wiki/changes'
-
-      expect(response).to have_http_status(:ok)
-      rows = json.select { _1.fetch('wiki_page').fetch('id') == page.id }
-      expect(rows.map { _1.fetch('revision_id') })
-          .to contain_exactly(first_revision.id, last_revision.id)
-      expect(rows.map { _1.fetch('revision_id') }).not_to include(extra.id)
-      expect(rows.map { _1.fetch('wiki_page').fetch('title') })
-          .to all(eq('タググループ:読取り契約'))
-    end
-  end
-
-  it 'resolves new resources by title while excluding colliding legacy Help' do
-    help = seed_wiki_page(
-        tag_name: create(:tag_name, name: 'Help:ID衝突'), body: 'help', created_by_user: user)
-    seed_group(name: 'ID衝突', id: help.id, description: 'group')
-    TagDescription.create!(
-        id: help.id, tag: new_tag, language_code: 'ja', body: 'description', version_no: 1)
-    TagDescriptionVersion.create!(
-        tag_id: new_tag.id, language_code: 'ja', version_no: 1,
-        event_type: 'create', body: 'description', created_at: Time.current)
-    { 'タググループ:ID衝突' => 'group', '新タグ' => 'description' }
-        .each do |title, body|
-      get "/wiki/title/#{ CGI.escapeURIComponent(title) }"
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('body').strip).to eq(body)
-    end
-    without_group_legacy_reads do
-      get "/wiki/title/#{ CGI.escapeURIComponent(help.title) }"
-    end
-    expect(response).to have_http_status(:not_found)
-  end
-end

backend/spec/requests/tag_group_wiki_write_spec.rb

@@ -1,307 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group Wiki facade writes', type: :request do
-  include TagGroupRecords
-  include ActiveSupport::Testing::TimeHelpers
-
-  let!(:user) { create_member_user! }
-  let!(:tag) { group_tag('洗澡鹿') }
-  let!(:other_tag) { group_tag('伊地知ニジカ') }
-  let(:headers) { { 'X-Transfer-Code' => user.inheritance_code } }
-  let(:members) { [{ 'tag_id' => tag.id, 'version_no' => tag.version_no }] }
-  let(:placements) { [{ 'tag_id' => tag.id, 'children' => [] }] }
-
-  before { I18n.locale = :ja }
-
-  def create_group title: 'タググループ:新規', body: '- 洗澡鹿', request_headers: headers
-    post '/wiki', params: { title:, body: }, headers: request_headers
-  end
-
-  def expect_rejected_without_writes
-    before_state = group_state
-    yield
-    aggregate_failures do
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(group_state).to eq(before_state)
-      expect(response.media_type).to eq('application/json')
-      expect(response.body).not_to be_empty
-      next if response.body.empty?
-
-      expect(json).to include(
-          'type' => 'validation_error', 'errors' => a_kind_of(Hash),
-          'base_errors' => a_kind_of(Array))
-    end
-  end
-
-  it 'creates the group, snapshot and matching compatibility histories' do
-    expect { create_group }
-        .to change(WikiPage, :count).by(1)
-        .and change(WikiRevision, :count).by(1)
-        .and change(WikiVersion, :count).by(1)
-    expect(response).to have_http_status(:created)
-    group = group_rows('tag_groups', name: '新規').sole
-    expect(json).to include('id' => group.fetch('id'), 'title' => 'タググループ:新規')
-    expect_group_snapshot(group.fetch('id'), number: 1, members:, placements:)
-    version = group_version(group.fetch('id'), 1)
-    expect(version).to include('event_type' => 'create', 'created_by_user_id' => user.id)
-    expect(group).to include('created_by_user_id' => user.id, 'updated_by_user_id' => user.id)
-    page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'タググループ:新規' })
-    expect(page.body).to eq('- 洗澡鹿')
-    expect(page.current_revision.body).to eq(page.body)
-    expect(page.wiki_versions.sole.body).to eq(page.body)
-  end
-
-  it 'keeps repeated placements but only one membership and one snapshot member' do
-    create_group(body: "- 洗澡鹿\n# 再掲\n- 洗澡鹿")
-    expect(response).to have_http_status(:created)
-    id = group_rows('tag_groups', name: '新規').sole.fetch('id')
-    expect_group_snapshot(
-        id, number: 1, members:,
-        placements: placements + [
-            { 'section_name' => '再掲', 'description' => nil, 'children' => placements }])
-  end
-
-  it 'resolves a Japanese alias through tag_names.tag_id' do
-    create(:tag_name, :alias, tag:, name: '鹿の別名')
-    create_group(body: '- 鹿の別名')
-    expect(response).to have_http_status(:created)
-    id = group_rows('tag_groups', name: '新規').sole.fetch('id')
-    expect_group_snapshot(id, number: 1, members:, placements:)
-    get group_title_path('新規')
-    expect(response).to have_http_status(:ok)
-    expect(json.fetch('body').strip).to eq('- 洗澡鹿')
-  end
-
-  {
-      'unknown Tag' => '- 解決不能',
-      'unknown Tag Group' => '- タググループ:存在しない',
-      'empty Section' => '- :',
-      'unsupported placement syntax' => "```\n洗澡鹿\n```",
-      'six levels' => "- 洗澡鹿\n  - 洗澡鹿\n    - 洗澡鹿\n      - 洗澡鹿\n" +
-          "        - 洗澡鹿\n          - 洗澡鹿",
-      'blank body' => '',
-      'normalised blank body' => "\r\n\r\n" }.each do |label, body|
-    it "rejects #{ label } without fallback or partial create" do
-      expect_rejected_without_writes { create_group(body:) }
-    end
-  end
-
-  ['', 'タググループ:', "タググループ:#{ '長' * 256 }"].each do |title|
-    it "rejects an invalid required title of length #{ title.length }" do
-      expect_rejected_without_writes { create_group(title:) }
-    end
-  end
-
-  it 'rejects a duplicate group name even without a matching legacy Wiki' do
-    seed_group(name: '新規', description: '既存')
-    expect_rejected_without_writes { create_group }
-  end
-
-  it 'accepts the existing five-level placement depth boundary' do
-    body = (0...5).map { "#{ '  ' * _1 }- 洗澡鹿" }.join("\n")
-    create_group(body:)
-    expect(response).to have_http_status(:created)
-    id = group_rows('tag_groups', name: '新規').sole.fetch('id')
-    tree = []
-    5.times { tree = [{ 'tag_id' => tag.id, 'children' => tree }] }
-    expect_group_snapshot(id, number: 1, members:, placements: tree)
-  end
-
-  context 'updating a migrated group' do
-    let!(:page) { legacy_group('更新', '- 洗澡鹿') }
-    let!(:old_revision) { page.current_revision }
-
-    before { migrate_groups }
-
-    def update_group body: '- 伊地知ニジカ', title: 'タググループ:更新', request_headers: headers
-      put "/wiki/#{ page.id }", params: { title:, body: }, headers: request_headers
-    end
-
-    [1, 3].each do |repetitions|
-      it "keeps identical Markdown unchanged after #{ repetitions } Wiki PUTs" do
-        body = page.body
-        travel_to(1.hour.from_now) do
-          expect_noop_group_update(group_id: page.id, page:) do
-            repetitions.times do
-              update_group(body:)
-              expect(response).to have_http_status(:ok)
-            end
-          end
-        end
-      end
-    end
-
-    it 'keeps identical Markdown unchanged with a stale base_revision_id' do
-      update_group
-      expect(response).to have_http_status(:ok)
-      body = page.reload.body
-      expect(page.current_revision.id).not_to eq(old_revision.id)
-
-      travel_to(1.hour.from_now) do
-        expect_noop_group_update(group_id: page.id, page:) do
-          put "/wiki/#{ page.id }",
-              params: { title: page.title, body:, base_revision_id: old_revision.id },
-              headers: headers
-        end
-      end
-    end
-
-    it 'keeps the original editor on identical Markdown from another member' do
-      editor = create(:user, :member)
-      body = page.body
-      travel_to(1.hour.from_now) do
-        expect_noop_group_update(group_id: page.id, page:) do
-          update_group(body:, request_headers: { 'X-Transfer-Code' => editor.inheritance_code })
-        end
-      end
-    end
-
-    it 'does not add history for Wiki content already changed through Native' do
-      changed_members = [{ 'tag_id' => other_tag.id }]
-      changed_placements = [{ 'tag_id' => other_tag.id, 'children' => [] }]
-      put "/tag_groups/#{ page.id }",
-          params: { name: '更新', description: nil,
-                    members: changed_members, placements: changed_placements },
-          headers:, as: :json
-      expect(response).to have_http_status(:ok)
-      expect_group_snapshot(
-          page.id, number: 2,
-          members: [{ 'tag_id' => other_tag.id, 'version_no' => other_tag.version_no }],
-          placements: changed_placements)
-      body = page.reload.body
-      expect(body).to eq('- 伊地知ニジカ')
-
-      travel_to(1.hour.from_now) do
-        expect_noop_group_update(group_id: page.id, page:) { update_group(body:) }
-      end
-    end
-
-    it 'replaces current membership and placement, retaining the old snapshot' do
-      old = group_version(page.id, 1)
-      update_group
-      expect(response).to have_http_status(:ok)
-      expect_group_snapshot(
-          page.id, number: 2,
-          members: [{ 'tag_id' => other_tag.id, 'version_no' => other_tag.version_no }],
-          placements: [{ 'tag_id' => other_tag.id, 'children' => [] }])
-      expect(group_version(page.id, 1)).to eq(old)
-      expect(group_version(page.id, 2)).to include(
-          'event_type' => 'update', 'created_by_user_id' => user.id)
-      expect(page.reload.body.strip).to eq('- 伊地知ニジカ')
-      expect(page.wiki_revisions.count).to eq(2)
-      expect(page.wiki_versions.count).to eq(2)
-      expect(page.current_revision.body).to eq(page.body)
-      expect(page.wiki_versions.order(:version_no).last.body).to eq(page.body)
-    end
-
-    it 'accepts the current base_revision_id used by the existing frontend' do
-      put "/wiki/#{ page.id }",
-          params: { title: page.title, body: '- 伊地知ニジカ',
-                    base_revision_id: old_revision.id }, headers: headers
-      expect(response).to have_http_status(:ok)
-      expect(group_rows('tag_groups', id: page.id).sole.fetch('version_no')).to eq(2)
-    end
-
-    it 'ignores a stale base_revision_id without rejecting the update' do
-      update_group
-      expect(response).to have_http_status(:ok)
-
-      put "/wiki/#{ page.id }",
-          params: { title: page.title, body: '- 洗澡鹿',
-                    base_revision_id: old_revision.id }, headers: headers
-
-      expect(response).to have_http_status(:ok)
-      expect(group_rows('tag_groups', id: page.id).sole.fetch('version_no')).to eq(3)
-      expect(page.reload.body.strip).to eq('- 洗澡鹿')
-    end
-
-    it 'records the editor and update time' do
-      editor = create(:user, :member, name: '編輯者')
-      travel_to(Time.current + 1.hour) do
-        update_group(request_headers: { 'X-Transfer-Code' => editor.inheritance_code })
-        expect(response).to have_http_status(:ok)
-        current = group_rows('tag_groups', id: page.id).sole
-        version = group_version(page.id, 2)
-        expect(current).to include('updated_by_user_id' => editor.id)
-        expect(version).to include('created_by_user_id' => editor.id)
-        expect(current.fetch('updated_at')).to be_within(1.second).of(Time.current)
-        expect(version.fetch('created_at')).to be_within(1.second).of(Time.current)
-      end
-    end
-
-    ['- 不明なタグ', '- タググループ:不明', '', '- :'].each do |body|
-      it "rejects invalid update #{ body.inspect } atomically" do
-        expect_rejected_without_writes { update_group(body:) }
-      end
-    end
-
-    it 'rejects direct self inclusion' do
-      expect_rejected_without_writes { update_group(body: '- タググループ:更新') }
-    end
-
-    it 'rejects indirect cyclic membership' do
-      seed_group(
-          name: '子', members: [{ 'tag_group_id' => page.id, 'version_no' => 1 }],
-          placements: [{ 'tag_group_id' => page.id, 'children' => [] }])
-      expect_rejected_without_writes { update_group(body: '- タググループ:子') }
-    end
-
-    it 'rejects duplicate rename without retaining a partial title or version' do
-      seed_group(name: '既存', description: '既存')
-      expect_rejected_without_writes { update_group(title: 'タググループ:既存') }
-    end
-  end
-
-  [:create, :update].each do |operation|
-    context "#{ operation } access and atomicity" do
-      let!(:page) do
-        next unless operation == :update
-
-        legacy = legacy_group('更新', '- 洗澡鹿')
-        seed_group(name: '更新', id: legacy.id, members:, placements:)
-        legacy
-      end
-      let!(:child_id) { seed_group(name: '子グループ', description: '子') }
-
-      def write_group operation, request_headers
-        body = "- 伊地知ニジカ\n- タググループ:子グループ"
-        if operation == :create
-          create_group(body:, request_headers:)
-        else
-          put "/wiki/#{ page.id }",
-              params: { title: 'タググループ:更新', body: }, headers: request_headers
-        end
-      end
-
-      [nil, :guest, :banned].each do |role|
-        it "rejects #{ role || 'anonymous' } without writes" do
-          actor = case role
-          when :guest then create(:user, :guest)
-          when :banned then create(:user, :member, :banned)
-          end
-          request_headers = actor ? { 'X-Transfer-Code' => actor.inheritance_code } : { }
-          before_state = group_state
-          write_group(operation, request_headers)
-          expect(response).to have_http_status(role ? :forbidden : :unauthorized)
-          expect(group_state).to eq(before_state)
-        end
-      end
-
-      it 'rejects a banned IP even for a member' do
-        IpAddress.create!(ip_address: IPAddr.new('127.0.0.1').hton, banned_at: Time.current)
-        before_state = group_state
-        write_group(operation, headers)
-        expect(response).to have_http_status(:forbidden)
-        expect(group_state).to eq(before_state)
-      end
-
-      tables = TagGroupRecords::GROUP_TABLES
-      tables += ['wiki_pages', 'wiki_revisions', 'wiki_versions']
-      tables.each do |table|
-        it "rolls back all writes after a real #{ table } write fails" do
-          expect_atomic_group_write(table) { write_group(operation, headers) }
-        end
-      end
-    end
-  end
-end

backend/spec/requests/tag_group_write_integrity_spec.rb

@@ -1,331 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group write integrity', type: :request do
-  include WikiRecords
-  include TagGroupRecords
-  include ActiveSupport::Testing::TimeHelpers
-
-  let!(:user) { create_member_user! }
-  let!(:tag) { group_tag('洗澡鹿') }
-  let!(:other_tag) { group_tag('伊地知ニジカ') }
-  let(:headers) { { 'X-Transfer-Code' => user.inheritance_code } }
-  let(:members) { [{ 'tag_id' => tag.id, 'version_no' => tag.version_no }] }
-  let(:placements) { [{ 'tag_id' => tag.id, 'children' => [] }] }
-
-  before { I18n.locale = :ja }
-
-  def native_payload name: '更新', nodes: placements, member_rows: members
-    { name:, description: nil, members: member_rows.map do |member|
-      member.except('version_no')
-    end, placements: nodes }
-  end
-
-  def put_wiki id, title:, body: '- 伊地知ニジカ', base: nil
-    put "/wiki/#{ id }", params: { title:, body:, base_revision_id: base }, headers: headers
-  end
-
-  def create_help body
-    seed_wiki_page(
-        tag_name: create(:tag_name, name: 'Help:既存'), body:, created_by_user: user)
-  end
-
-  def expect_no_writes
-    before_state = group_state
-    yield
-    expect(response).to have_http_status(:unprocessable_entity)
-    expect(group_state).to eq(before_state)
-  end
-
-  context 'resource identity' do
-    it 'rejects removing the prefix from a migrated group atomically' do
-      page = legacy_group('更新', '- 洗澡鹿')
-      seed_group(name: '更新', id: page.id, members:, placements:)
-
-      expect_no_writes do
-        put_wiki(page.id, title: '更新', base: page.current_revision.id)
-      end
-    end
-
-    it 'rejects an unprefixed update to an independent group' do
-      id = seed_group(name: '独立', members:, placements:)
-      expect_no_writes { put_wiki(id, title: '独立') }
-    end
-
-    it 'does not revive legacy writes when the compatibility title is stale' do
-      page = legacy_group('更新', '- 洗澡鹿')
-      seed_group(name: '更新', id: page.id, members:, placements:)
-      page.tag_name.update!(name: '古い別名')
-
-      expect_no_writes { put_wiki(page.id, title: '古い別名') }
-    end
-
-    it 'renames the group and its compatibility page through the operation' do
-      page = legacy_group('更新', '- 洗澡鹿')
-      seed_group(name: '更新', id: page.id, members:, placements:)
-
-      put_wiki(page.id, title: 'タググループ:改名')
-
-      expect(response).to have_http_status(:ok)
-      expect(TagGroup.find(page.id)).to have_attributes(name: '改名', version_no: 2)
-      expect(page.reload.title).to eq('タググループ:改名')
-      expect(page.body).to eq('- 伊地知ニジカ')
-    end
-
-    it 'rejects a standalone Help update despite a colliding group ID' do
-      page = create_help('Help body')
-      id = seed_group(name: '別グループ', id: page.id, members:, placements:)
-      group_before = TagGroup.find(id).attributes
-      version_before = group_version(id, 1)
-
-      expect_no_writes { put_wiki(id, title: 'Help:改名', body: 'Help after') }
-
-      expect(page.reload.body).to eq('Help body')
-      expect(page.title).to eq('Help:既存')
-      expect(TagGroup.find(id).attributes).to eq(group_before)
-      expect(group_version(id, 1)).to eq(version_before)
-    end
-
-    it 'rejects an ambiguous unprefixed rename when Help and group IDs collide' do
-      page = create_help('Help body')
-      seed_group(name: '更新', id: page.id, members:, placements:)
-
-      expect_no_writes { put_wiki(page.id, title: '更新') }
-      expect_no_writes do
-        put_wiki(page.id, title: '更新', base: page.current_revision.id)
-      end
-    end
-
-    it 'keeps a description update separate from a colliding group' do
-      page = Wiki::Commit.create_content!(
-          tag_name: tag.tag_name('ja'), body: 'description before', created_by_user: user)
-      description = TagDescription.find_by!(tag_id: tag.id)
-      id = seed_group(name: '更新', id: description.id, members:, placements:)
-      group_before = TagGroup.find(id).attributes
-
-      put_wiki(id, title: '洗澡鹿', body: 'description after')
-
-      expect(response).to have_http_status(:ok)
-      expect(TagDescription.find(id).body).to eq('description after')
-      expect(page.reload.body).to eq('description after')
-      expect(TagGroup.find(id).attributes).to eq(group_before)
-    end
-
-    it 'does not route a colliding Help write into an unrelated description' do
-      page = create_help('Help before')
-      id = seed_group(name: '更新', id: page.id, members:, placements:)
-      description = TagDescription.create!(
-          id:, tag:, language_code: 'ja', version_no: 1, body: 'description')
-
-      expect_no_writes { put_wiki(id, title: 'Help:既存', body: 'Help after') }
-
-      expect(page.reload.body).to eq('Help before')
-      expect(description.reload.body).to eq('description')
-      expect(TagGroup.find(id).version_no).to eq(1)
-      put_wiki(id, title: '洗澡鹿', body: 'description after')
-      expect(response).to have_http_status(:ok)
-      expect(description.reload.body).to eq('description after')
-      put_wiki(id, title: 'タググループ:更新')
-      expect(response).to have_http_status(:ok)
-      expect(TagGroup.find(id).version_no).to eq(2)
-      expect(page.reload.body).to eq('Help before')
-      expect(description.reload.body).to eq('description after')
-    end
-  end
-
-  context 'compatibility synchronisation' do
-    it 'synchronises a native rename without modifying an ID-colliding Help page' do
-      help = create_help('Help before')
-      id = seed_group(name: '更新', id: help.id, members:, placements:)
-      help_before = help.attributes
-
-      expect do
-        put "/tag_groups/#{ id }", params: native_payload(name: '改名'), headers:, as: :json
-      end.to change(WikiPage, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(TagGroup.find(id).name).to eq('改名')
-      expect(help.reload.attributes).to eq(help_before)
-    end
-
-    ['wiki_lines', 'wiki_revision_lines'].each do |table|
-      it "rolls back native and compatibility state on #{ table } failure" do
-        expect_atomic_group_write(table) do
-          post '/tag_groups', params: native_payload, headers:, as: :json
-        end
-      end
-    end
-
-    it 'rolls back a renderer failure instead of treating it as unsupported structure' do
-      allow(TagGroupMarkdownRenderer).to receive(:render).and_raise('renderer failure')
-      before_state = group_state
-
-      expect do
-        post '/tag_groups', params: native_payload, headers:, as: :json
-      end.to raise_error(RuntimeError, 'renderer failure')
-
-      expect(group_state).to eq(before_state)
-    end
-
-    it 'preserves unplaced membership and reports the skipped sync with its version' do
-      page = legacy_group('更新', '- 洗澡鹿')
-      id = seed_group(name: '更新', id: page.id, members:, placements:)
-      wiki_before = group_state.slice(*TagGroupRecords::WRITE_TABLES.drop(5))
-      warnings = []
-      allow(Rails.logger).to receive(:warn) { warnings << _1 }
-
-      put "/tag_groups/#{ id }",
-          params: native_payload(member_rows: members + [{ 'tag_id' => other_tag.id }]),
-          headers:, as: :json
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('members').map { _1.fetch('tag').fetch('id') })
-          .to contain_exactly(tag.id, other_tag.id)
-      expect(group_version(id, 2).fetch('members')).to include(
-          { 'tag_id' => other_tag.id, 'version_no' => other_tag.version_no })
-      expect(group_state.slice(*TagGroupRecords::WRITE_TABLES.drop(5))).to eq(wiki_before)
-      payload = JSON.parse(warnings.grep(/tag_group_wiki_sync_skipped/).sole.split(' ', 2).last)
-      expect(payload).to include(
-          'status' => 'unsupported_structure', 'tag_group_id' => id,
-          'version_no' => 2, 'user_id' => user.id,
-          'reason' => '掲載位置のない membership は Markdown にできません．')
-    end
-
-    it 'preserves a list Section description and records why no Wiki was created' do
-      nodes = [{ 'tag_id' => tag.id, 'children' => [
-          { 'section_name' => '区分', 'description' => '構造化の説明', 'children' => [] }] }]
-      warnings = []
-      allow(Rails.logger).to receive(:warn) { warnings << _1 }
-      before_count = WikiPage.count
-
-      post '/tag_groups', params: native_payload(nodes:), headers:, as: :json
-
-      expect(response).to have_http_status(:created)
-      id = json.fetch('id')
-      expect(group_version(id, 1).fetch('placements')).to eq(nodes)
-      expect(json.fetch('placements').sole.fetch('children').sole)
-          .to include('description' => '構造化の説明')
-      expect(WikiPage.count).to eq(before_count)
-      expect(warnings.grep(/tag_group_wiki_sync_skipped/).sole)
-          .to include('リスト内 Section の説明文は Markdown にできません．')
-    end
-  end
-
-  context 'identifier Markdown' do
-    ['[洗澡鹿](https://example.com)', '*洗澡鹿*', '**洗澡鹿**', '`洗澡鹿`',
-     '![洗澡鹿](https://example.com/image.png)',
-     '[タググループ:子](https://example.com)', '*区分*:',
-     '[区分](https://example.com):'].each do |label|
-      [:create, :update].each do |operation|
-        it "rejects decorated #{ label } on #{ operation } without writes" do
-          seed_group(name: '子', description: '子')
-          id = seed_group(name: '更新', members:, placements:)
-          expect_no_writes do
-            if operation == :create
-              post '/wiki', params: { title: 'タググループ:新規', body: "- #{ label }" },
-                   headers: headers
-            else
-              put_wiki(id, title: 'タググループ:更新', body: "- #{ label }")
-            end
-          end
-        end
-      end
-    end
-
-    ['# [区分](https://example.com)', '# *区分*', '# `区分`', '# 区分 {#custom}',
-     '# ![区分](https://example.com/image.png)'].each do |heading|
-      it "rejects a decorated heading #{ heading } without writes" do
-        expect_no_writes do
-          post '/wiki', params: { title: 'タググループ:新規', body: "#{ heading }\n- 洗澡鹿" },
-               headers: headers
-        end
-      end
-    end
-
-    it 'preserves allowed markup in group and heading descriptions' do
-      description = '[参照](https://example.com "リンクの説明") と *強調* と ``a`b``'
-      body = "#{ description }\n\n# 区分\n#{ description }\n\n- 洗澡鹿"
-      post '/wiki', params: { title: 'タググループ:説明構文', body: }, headers: headers
-
-      expect(response).to have_http_status(:created)
-      id = json.fetch('id')
-      version = group_version(id, 1)
-      expect(version.fetch('description')).to eq(description)
-      expect(version.fetch('placements').sole.fetch('description')).to eq(description)
-    end
-  end
-
-  context 'structure audit information' do
-    let!(:child_id) { seed_group(name: '子', description: '子') }
-    let(:members) do
-      [{ 'tag_id' => tag.id, 'version_no' => tag.version_no },
-       { 'tag_group_id' => child_id, 'version_no' => 1 }]
-    end
-    let(:placements) do
-      [{ 'tag_id' => tag.id, 'children' => [
-          { 'tag_group_id' => child_id, 'children' => [] }] }]
-    end
-    let!(:id) { seed_group(name: '更新', members:, placements:) }
-    let!(:editor) { create(:user, :member) }
-    let(:headers) { { 'X-Transfer-Code' => editor.inheritance_code } }
-
-    it 'keeps all membership and placement audit fields on a name-only edit' do
-      before_rows = group_state.slice('tag_group_tags', 'tag_group_groups', 'tag_group_placements')
-      travel_to(1.hour.from_now) do
-        put "/tag_groups/#{ id }", params: native_payload(name: '改名'), headers:, as: :json
-      end
-
-      expect(response).to have_http_status(:ok)
-      expect(group_state.slice(*before_rows.keys)).to eq(before_rows)
-      expect(group_version(id, 2)).to include('name' => '改名', 'members' => members)
-    end
-
-    it 'keeps membership and placement audit fields on a description-only edit' do
-      before_rows = group_state.slice('tag_group_tags', 'tag_group_groups', 'tag_group_placements')
-      travel_to(1.hour.from_now) do
-        put "/tag_groups/#{ id }",
-            params: native_payload.merge(description: '説明を追加'), headers:, as: :json
-      end
-
-      expect(response).to have_http_status(:ok)
-      expect(group_state.slice(*before_rows.keys)).to eq(before_rows)
-      expect(group_version(id, 2)).to include('description' => '説明を追加', 'members' => members)
-    end
-
-    it 'rolls back membership removal and placement edits on a late sync failure' do
-      new_members = [{ 'tag_id' => tag.id }]
-      new_nodes = [{ 'tag_id' => tag.id, 'children' => [] }]
-      expect_atomic_group_write('wiki_versions') do
-        put "/tag_groups/#{ id }",
-            params: native_payload(nodes: new_nodes, member_rows: new_members), headers:, as: :json
-      end
-    end
-
-    it 'changes only added or removed membership and keeps placement creation audit' do
-      tag_row = TagGroupTag.find([id, tag.id]).attributes
-      placement_row = TagGroupPlacement.find([id, 1]).attributes
-      new_members = [{ 'tag_id' => tag.id }, { 'tag_id' => other_tag.id }]
-      new_nodes = [{ 'tag_id' => tag.id, 'children' => [
-          { 'tag_id' => other_tag.id, 'children' => [] }] }]
-      child_row = TagGroupPlacement.find([id, 2]).attributes
-      travel_to(1.hour.from_now) do
-        put "/tag_groups/#{ id }",
-            params: native_payload(nodes: new_nodes, member_rows: new_members), headers:, as: :json
-      end
-
-      expect(response).to have_http_status(:ok)
-      expect(TagGroupTag.find([id, tag.id]).attributes).to eq(tag_row)
-      expect(TagGroupGroup.exists?(tag_group_id: id, child_tag_group_id: child_id)).to be(false)
-      expect(TagGroupTag.find([id, other_tag.id]).created_by_user_id).to eq(editor.id)
-      expect(TagGroupPlacement.find([id, 1]).attributes).to eq(placement_row)
-      changed = TagGroupPlacement.find([id, 2])
-      expect(changed).to have_attributes(
-          tag_id: other_tag.id, child_tag_group_id: nil, updated_by_user_id: editor.id,
-          created_at: child_row.fetch('created_at'),
-          created_by_user_id: child_row.fetch('created_by_user_id'))
-      expect(changed.updated_at).to be > child_row.fetch('updated_at')
-      expect(group_version(id, 1).fetch('members')).to eq(members)
-    end
-  end
-end

backend/spec/requests/tag_groups_spec.rb

@@ -1,467 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag group native API', type: :request do
-  include TagGroupRecords
-  include ActiveSupport::Testing::TimeHelpers
-
-  let!(:user) { create_member_user! }
-  let!(:group_id) { seed_group(name: '専用API', description: '説明') }
-
-  before { I18n.locale = :ja }
-
-  def expect_native_group value
-    expect(value).to include(
-        'id' => group_id, 'name' => '専用API', 'description' => '説明',
-        'version_no' => 1, 'members' => [], 'placements' => [],
-        'created_by_user' => UserRepr.base(user), 'updated_by_user' => UserRepr.base(user))
-    current = group_rows('tag_groups', id: group_id).sole
-    expect(value).to include(
-        'created_at' => current.fetch('created_at').iso8601(3),
-        'updated_at' => current.fetch('updated_at').iso8601(3))
-  end
-
-  it 'serves the collection as JSON without reading Wiki tables' do
-    without_group_legacy_reads { get '/tag_groups' }
-    expect(response).to have_http_status(:ok)
-    expect(response.media_type).to eq('application/json')
-    expect(json).to be_a(Array)
-    expect_native_group(json.find { _1.fetch('id') == group_id })
-  end
-
-  it 'serves an independent group as JSON without reading Wiki tables' do
-    without_group_legacy_reads { get "/tag_groups/#{ group_id }" }
-    expect(response).to have_http_status(:ok)
-    expect(response.media_type).to eq('application/json')
-    expect_native_group(json)
-  end
-
-  it 'provides the confirmed PUT update route' do
-    route = Rails.application.routes.recognize_path("/tag_groups/#{ group_id }", method: :put)
-    expect(route).to include(action: 'update', id: group_id.to_s)
-  end
-
-  [:create, :update].each do |operation|
-    [nil, :guest, :banned].each do |role|
-      it "rejects #{ role || 'anonymous' } native #{ operation } without writes" do
-        actor = case role
-        when :guest then create(:user, :guest)
-        when :banned then create(:user, :member, :banned)
-        end
-        headers = actor ? { 'X-Transfer-Code' => actor.inheritance_code } : { }
-        before_state = group_state
-        if operation == :create
-          post '/tag_groups', params: { }, headers:, as: :json
-        else
-          put "/tag_groups/#{ group_id }", params: { }, headers:, as: :json
-        end
-        expect(response).to have_http_status(role ? :forbidden : :unauthorized)
-        expect(group_state).to eq(before_state)
-      end
-    end
-
-    it "rejects a banned IP for native #{ operation }" do
-      IpAddress.create!(ip_address: IPAddr.new('127.0.0.1').hton, banned_at: Time.current)
-      headers = { 'X-Transfer-Code' => user.inheritance_code }
-      before_state = group_state
-      if operation == :create
-        post '/tag_groups', params: { }, headers:, as: :json
-      else
-        put "/tag_groups/#{ group_id }", params: { }, headers:, as: :json
-      end
-      expect(response).to have_http_status(:forbidden)
-      expect(group_state).to eq(before_state)
-    end
-  end
-
-  context 'structured membership and placements' do
-    let!(:tag) { group_tag('掲載タグ') }
-    let!(:unplaced) { group_tag('未掲載タグ') }
-    let!(:child_id) { seed_group(name: '子', description: '子の説明') }
-    let(:headers) { { 'X-Transfer-Code' => user.inheritance_code } }
-    let(:members) do
-      [{ 'tag_id' => tag.id }, { 'tag_group_id' => child_id }, { 'tag_id' => unplaced.id }]
-    end
-    let(:snapshot_members) do
-      [{ 'tag_id' => tag.id, 'version_no' => tag.version_no },
-       { 'tag_group_id' => child_id, 'version_no' => 1 },
-       { 'tag_id' => unplaced.id, 'version_no' => unplaced.version_no }]
-    end
-    let(:placements) do
-      [{ 'section_name' => '区分', 'description' => '区分の説明', 'children' => [
-          { 'tag_id' => tag.id, 'children' => [
-              { 'tag_group_id' => child_id, 'children' => [] }] },
-          { 'tag_id' => tag.id, 'children' => [] }] }]
-    end
-    let(:payload) { { name: '構造化', description: '全体の説明', members:, placements: } }
-
-    def native_write operation, attributes = payload
-      if operation == :create
-        post '/tag_groups', params: attributes, headers:, as: :json
-      else
-        put "/tag_groups/#{ group_id }", params: attributes, headers:, as: :json
-      end
-    end
-
-    def expect_structured_response
-      tag_repr = { 'id' => tag.id, 'name' => '掲載タグ', 'category' => tag.category }
-      unplaced_repr = { 'id' => unplaced.id, 'name' => '未掲載タグ',
-                        'category' => unplaced.category }
-      expect(json.fetch('members')).to contain_exactly(
-          include('tag' => include(tag_repr)),
-          include('tag' => include(unplaced_repr)),
-          include('tag_group' => include('id' => child_id, 'name' => '子')))
-      expect(json.fetch('placements')).to match([
-          include('section_name' => '区分', 'description' => '区分の説明', 'children' => [
-              include('tag' => include(tag_repr), 'children' => [
-                  include('tag_group' => include('id' => child_id, 'name' => '子'),
-                          'children' => [])]),
-              include('tag' => include(tag_repr), 'children' => [])])])
-    end
-
-    [:create, :update].each do |operation|
-      it "#{ operation }s structured data and keeps unplaced membership" do
-        previous = group_version(group_id, 1)
-        native_write(operation)
-        expect(response).to have_http_status(operation == :create ? :created : :ok)
-        id = operation == :create ? json.fetch('id') : group_id
-        number = operation == :create ? 1 : 2
-        expect_group_snapshot(
-            id, number:, members: snapshot_members, placements:, description: '全体の説明')
-        expect(group_version(group_id, 1)).to eq(previous)
-        get "/tag_groups/#{ id }"
-        expect(response).to have_http_status(:ok)
-        expect(json).to include(
-            'id' => id, 'name' => '構造化', 'description' => '全体の説明', 'version_no' => number,
-            'created_by_user' => UserRepr.base(user), 'updated_by_user' => UserRepr.base(user))
-        expect_structured_response
-      end
-
-      {
-          'blank name' => { name: '' },
-          'missing name' => { name: nil },
-          'oversized name' => { name: '長' * 256 },
-          'duplicate name' => { name: '子' },
-          'placement without a kind' => { placements: [{ children: [] }] },
-          'empty Section name' => { placements: [{ section_name: '', children: [] }] } }
-          .each do |label, invalid|
-        it "rejects #{ label } on #{ operation } without partial writes" do
-          before_state = group_state
-          native_write(operation, payload.merge(invalid))
-          aggregate_failures do
-            expect(response).to have_http_status(:unprocessable_entity)
-            expect(group_state).to eq(before_state)
-          end
-        end
-      end
-
-      it "rejects multiple placement kinds on #{ operation }" do
-        before_state = group_state
-        invalid = [{ tag_id: tag.id, section_name: '不正', children: [] }]
-        native_write(operation, payload.merge(placements: invalid))
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(group_state).to eq(before_state)
-      end
-
-      it "rejects a missing referenced Tag on #{ operation }" do
-        missing = Tag.maximum(:id).to_i + 1
-        before_state = group_state
-        native_write(operation, payload.merge(
-            members: [{ tag_id: missing }], placements: [{ tag_id: missing, children: [] }]))
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(group_state).to eq(before_state)
-      end
-
-      it "rejects a missing referenced group on #{ operation }" do
-        missing = group_rows('tag_groups').map { _1.fetch('id') }.max + 1
-        before_state = group_state
-        native_write(operation, payload.merge(
-            members: [{ tag_group_id: missing }],
-            placements: [{ tag_group_id: missing, children: [] }]))
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(group_state).to eq(before_state)
-      end
-
-      it "rejects six descendant placement levels on #{ operation }" do
-        nodes = []
-        6.times { nodes = [{ tag_id: tag.id, children: nodes }] }
-        before_state = group_state
-        native_write(operation, payload.merge(placements: nodes))
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(group_state).to eq(before_state)
-      end
-    end
-
-    it 'preserves membership-only data in structured reads without inventing placements' do
-      id = seed_group(name: '未掲載のみ', members: [snapshot_members.last])
-      without_group_legacy_reads { get "/tag_groups/#{ id }" }
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('placements')).to eq([])
-      expect(json.fetch('members')).to match([
-          include('tag' => include('id' => unplaced.id, 'name' => '未掲載タグ'))])
-    end
-
-    it 'rejects indirect containment cycles' do
-      parent = seed_group(
-          name: '親', members: [{ 'tag_group_id' => group_id, 'version_no' => 1 }])
-      before_state = group_state
-      native_write(:update, payload.merge(
-          members: [{ tag_group_id: parent }], placements: []))
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(group_state).to eq(before_state)
-    end
-
-    it 'rejects direct containment even without a corresponding placement' do
-      before_state = group_state
-      native_write(:update, payload.merge(
-          members: [{ tag_group_id: group_id }], placements: []))
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(group_state).to eq(before_state)
-    end
-
-    it 'preserves list Section descriptions in native structured data' do
-      nodes = [{ tag_id: tag.id, children: [
-          { section_name: 'リスト内区分', description: '消してはいけない説明', children: [] }] }]
-      native_write(:update, payload.merge(placements: nodes))
-      expect(response).to have_http_status(:ok)
-      expect(group_version(group_id, 2).fetch('placements')).to eq(
-          JSON.parse(nodes.to_json))
-      get "/tag_groups/#{ group_id }"
-      expect(response).to have_http_status(:ok)
-      section = json.fetch('placements').sole.fetch('children').sole
-      expect(section).to include(
-          'section_name' => 'リスト内区分', 'description' => '消してはいけない説明')
-    end
-
-    context 'compatibility writes for representable structures' do
-      let(:group_id) do
-        page = legacy_group('専用API', '説明')
-        seed_group(name: '専用API', id: page.id, description: '説明')
-      end
-      let(:members) { [{ 'tag_id' => tag.id }, { 'tag_group_id' => child_id }] }
-      let(:snapshot_members) do
-        [{ 'tag_id' => tag.id, 'version_no' => tag.version_no },
-         { 'tag_group_id' => child_id, 'version_no' => 1 }]
-      end
-
-      it 'treats identical native content with unplaced membership as a no-op' do
-        unplaced_payload = payload.merge(
-            name: '専用API', members: members + [{ 'tag_id' => unplaced.id }])
-        native_write(:update, unplaced_payload)
-        expect(response).to have_http_status(:ok)
-        expect_group_snapshot(
-            group_id, number: 2, description: '全体の説明', placements:,
-            members: snapshot_members + [
-                { 'tag_id' => unplaced.id, 'version_no' => unplaced.version_no }])
-        page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'タググループ:専用API' })
-
-        travel_to(1.hour.from_now) do
-          expect_noop_group_update(group_id:, page:) do
-            native_write(:update, unplaced_payload)
-          end
-        end
-      end
-
-      context 'no-op updates against synchronised state' do
-        let(:synchronised_payload) do
-          { name: '構造化', description: '全体の説明',
-            members: [{ 'tag_id' => tag.id }, { 'tag_group_id' => child_id }], placements: }
-        end
-        let(:additional_tag) { group_tag('追加対象タグ') }
-        let(:compatibility_page) do
-          WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'タググループ:構造化' })
-        end
-
-        before do
-          native_write(:update, synchronised_payload)
-          expect(response).to have_http_status(:ok)
-          expect(compatibility_page.body).to include('- 掲載タグ', '- タググループ:子')
-        end
-
-        [1, 3].each do |repetitions|
-          it "keeps identical native content unchanged after #{ repetitions } PUTs" do
-            travel_to(1.hour.from_now) do
-              expect_noop_group_update(group_id:, page: compatibility_page) do
-                repetitions.times do
-                  native_write(:update, synchronised_payload)
-                  expect(response).to have_http_status(:ok)
-                end
-              end
-            end
-          end
-        end
-
-        it 'treats membership order alone as a no-op' do
-          travel_to(1.hour.from_now) do
-            expect_noop_group_update(group_id:, page: compatibility_page) do
-              native_write(:update, synchronised_payload.merge(
-                  members: synchronised_payload.fetch(:members).reverse))
-            end
-          end
-        end
-
-        it 'keeps the original editor when another member submits identical content' do
-          editor = create(:user, :member)
-          travel_to(1.hour.from_now) do
-            expect_noop_group_update(group_id:, page: compatibility_page) do
-              put "/tag_groups/#{ group_id }", params: synchronised_payload,
-                  headers: { 'X-Transfer-Code' => editor.inheritance_code }, as: :json
-            end
-          end
-        end
-
-        it 'does not add history for Native content already changed through Wiki' do
-          put "/wiki/#{ group_id }",
-              params: { title: 'タググループ:構造化', body: '- 未掲載タグ' }, headers: headers
-          expect(response).to have_http_status(:ok)
-          expect(compatibility_page.reload.body).to eq('- 未掲載タグ')
-          same_content = {
-              name: '構造化', description: nil, members: [{ 'tag_id' => unplaced.id }],
-              placements: [{ 'tag_id' => unplaced.id, 'children' => [] }] }
-          expect_group_snapshot(
-              group_id, number: 3, description: nil,
-              members: [{ 'tag_id' => unplaced.id, 'version_no' => unplaced.version_no }],
-              placements: same_content.fetch(:placements))
-
-          travel_to(1.hour.from_now) do
-            expect_noop_group_update(group_id:, page: compatibility_page) do
-              native_write(:update, same_content)
-            end
-          end
-        end
-
-        ['name', 'description', 'membership addition', 'membership removal',
-         'Section name', 'Section description', 'placement order', 'placement hierarchy']
-            .each do |change|
-          it "records a real #{ change } change in both histories" do
-            changed = synchronised_payload.deep_dup
-            section = changed.fetch(:placements).first
-            children = section.fetch('children')
-            case change
-            when 'name' then changed[:name] = '実際の改名'
-            when 'description' then changed[:description] = '実際の説明変更'
-            when 'membership addition'
-              expect(changed.fetch(:members)).not_to include('tag_id' => additional_tag.id)
-              changed[:members] << { 'tag_id' => additional_tag.id }
-              children << { 'tag_id' => additional_tag.id, 'children' => [] }
-            when 'membership removal'
-              changed[:members].reject! { _1.key?('tag_group_id') }
-              children.first['children'] = []
-            when 'Section name' then section['section_name'] = '別区分'
-            when 'Section description' then section['description'] = '別の区分説明'
-            when 'placement order' then children.reverse!
-            when 'placement hierarchy'
-              children << children.first.fetch('children').pop
-            end
-
-            old_versions = group_rows('tag_group_versions', tag_group_id: group_id)
-            group = TagGroup.find(group_id)
-            number = group.version_no
-            page = compatibility_page
-            old_revision_id = page.current_revision.id
-            old_wiki_version_id = page.wiki_versions.order(version_no: :desc).first.id
-            revision_count = page.wiki_revisions.count
-            version_count = page.wiki_versions.count
-            travel_to(1.hour.from_now) { native_write(:update, changed) }
-
-            expect(response).to have_http_status(:ok)
-            expected_members = changed.fetch(:members).map do |member|
-              target = if member.key?('tag_id')
-                Tag.find(member.fetch('tag_id'))
-              else
-                TagGroup.find(member.fetch('tag_group_id'))
-              end
-              member.merge('version_no' => target.version_no)
-            end
-            expect_group_snapshot(
-                group_id, number: number + 1, members: expected_members,
-                placements: changed.fetch(:placements), description: changed.fetch(:description))
-            expect(group.reload.name).to eq(changed.fetch(:name))
-            versions = group_rows('tag_group_versions', tag_group_id: group_id)
-            expect(versions.size).to eq(old_versions.size + 1)
-            expect(versions.select { _1.fetch('version_no') <= number }).to eq(old_versions)
-            expect(page.wiki_revisions.count).to eq(revision_count + 1)
-            expect(page.wiki_versions.count).to eq(version_count + 1)
-            expect(page.reload.current_revision.id).not_to eq(old_revision_id)
-            expect(page.wiki_versions.order(version_no: :desc).first.id)
-                .not_to eq(old_wiki_version_id)
-            get group_title_path(changed.fetch(:name))
-            expect(response).to have_http_status(:ok)
-            expect(json.fetch('body')).to eq(page.body)
-          end
-        end
-      end
-
-      it 'creates native state and its compatibility histories' do
-        expect { native_write(:create) }
-            .to change(WikiPage, :count).by(1)
-            .and change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-        expect(response).to have_http_status(:created)
-        expect_group_snapshot(
-            json.fetch('id'), number: 1, members: snapshot_members,
-            placements:, description: '全体の説明')
-      end
-
-      [:create, :update].each do |operation|
-        it "synchronises Wiki current state and histories on native #{ operation }" do
-          native_write(operation)
-          expect(response).to have_http_status(operation == :create ? :created : :ok)
-          id = operation == :create ? json.fetch('id') : group_id
-          number = operation == :create ? 1 : 2
-          expect_group_snapshot(
-              id, number:, members: snapshot_members, placements:, description: '全体の説明')
-          page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'タググループ:構造化' })
-          expect(page.body).to include('全体の説明', '# 区分', '- 掲載タグ', '- タググループ:子')
-          expect(page.current_revision.body).to eq(page.body)
-          expect(page.wiki_versions.order(:version_no).last.body).to eq(page.body)
-          expect(page.wiki_revisions.count).to eq(number)
-          expect(page.wiki_versions.count).to eq(number)
-          get group_title_path('構造化')
-          expect(response).to have_http_status(:ok)
-          expect(json.fetch('body')).to eq(page.body)
-        end
-
-        (TagGroupRecords::GROUP_TABLES + ['wiki_pages', 'wiki_revisions', 'wiki_versions'])
-            .each do |table|
-          it "rolls back native #{ operation } after #{ table } writes" do
-            expect_atomic_group_write(table) { native_write(operation) }
-          end
-        end
-      end
-
-      it 'assigns the next group ID from the existing maximum' do
-        child_id
-        expected_id = [TagGroup.maximum(:id).to_i, TagDescription.maximum(:id).to_i].max + 1
-        native_write(:create)
-        expect(response).to have_http_status(:created)
-        expect(json.fetch('id')).to eq(expected_id)
-      end
-
-      TagGroupRecords::GROUP_TABLES.each do |table|
-        it "rolls back native creation after #{ table } writes" do
-          expect_atomic_group_write(table) { native_write(:create) }
-        end
-      end
-
-      it 'updates a native group through Wiki and then reads structured current data' do
-        native_write(:create)
-        expect(response).to have_http_status(:created)
-        id = json.fetch('id')
-        previous = group_version(id, 1)
-        put "/wiki/#{ id }",
-            params: { title: 'タググループ:構造化', body: '- 未掲載タグ' }, headers: headers
-        expect(response).to have_http_status(:ok)
-        expect_group_snapshot(
-            id, number: 2,
-            members: [{ 'tag_id' => unplaced.id, 'version_no' => unplaced.version_no }],
-            placements: [{ 'tag_id' => unplaced.id, 'children' => [] }])
-        expect(group_version(id, 1)).to eq(previous)
-        get "/tag_groups/#{ id }"
-        expect(response).to have_http_status(:ok)
-        expect(json).to include('version_no' => 2)
-        expect(json.fetch('members')).to match([
-            include('tag' => include('id' => unplaced.id, 'name' => '未掲載タグ'))])
-      end
-    end
-  end
-end

backend/spec/requests/tag_resource_ids_spec.rb

@@ -1,101 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag resource ID allocation', type: :request do
-  include TagGroupRecords
-  include WikiRecords
-
-  let!(:user) { create_member_user! }
-  let(:headers) { { 'X-Transfer-Code' => user.inheritance_code } }
-
-  def seed_description id
-    tag = create(:tag, primary_name: "description_id_#{ id }")
-    TagDescription.create!(id:, tag:, language_code: 'ja', body: 'existing', version_no: 1)
-  end
-
-  def create_resource resource
-    if resource == :description
-      tag = create(:tag, primary_name: 'new_description')
-      post '/wiki', params: { title: tag.name('ja'), body: 'new description' }, headers: headers
-    else
-      post '/tag_groups', params: {
-          name: 'new_group', description: 'new group', members: [], placements: [] },
-          headers:, as: :json
-    end
-    expect(response).to have_http_status(:created)
-  end
-
-  [:description, :group].each do |resource|
-    it "keeps #{ resource } independent of the Tag and ExternalTag ID space" do
-      create(:tag, id: 100)
-      create(:external_tag, id: 200)
-      seed_description(1)
-      seed_group(name: 'shared_space', id: 2)
-
-      create_resource(resource)
-
-      expect(json.fetch('id')).to eq(3)
-    end
-
-    it "uses the other resource's larger maximum when allocating #{ resource }" do
-      seed_description(resource == :description ? 1 : 20)
-      seed_group(name: 'other_space', id: resource == :group ? 1 : 20)
-      create_resource(resource)
-      expect(json.fetch('id')).to eq(21)
-    end
-
-    it "starts #{ resource } at 1 even after previous allocated rows were removed" do
-      expect(TagDescription.count).to eq(0)
-      expect(TagGroup.count).to eq(0)
-      if resource == :description
-        seed_description(100).destroy!
-      else
-        id = seed_group(name: 'removed', id: 100)
-        TagGroup.find(id).destroy!
-      end
-      create_resource(resource)
-      expect(json.fetch('id')).to eq(1)
-    end
-
-    it "allocates #{ resource } above both maxima, preserving legacy overlaps and gaps" do
-      [1, 2, 5].each { seed_description(_1) }
-      [1, 3, 8].each { seed_group(name: "group_#{ _1 }", id: _1) }
-      descriptions = TagDescription.order(:id).map(&:attributes)
-      groups = TagGroup.order(:id).map(&:attributes)
-
-      create_resource(resource)
-
-      expect(json.fetch('id')).to eq(9)
-      expect(TagDescription.where(id: [1, 2, 5]).order(:id).map(&:attributes)).to eq(descriptions)
-      expect(TagGroup.where(id: [1, 3, 8]).order(:id).map(&:attributes)).to eq(groups)
-      expect(TagDescription.exists?(id: 3)).to be(false)
-      expect(TagGroup.exists?(id: 2)).to be(false)
-    end
-  end
-
-  it 'preserves group ID and unrelated rows on update' do
-    id = seed_group(name: 'existing', id: 5, description: 'before')
-    other_id = seed_group(name: 'other', id: 8, description: 'other')
-    other = TagGroup.find(other_id).attributes
-    put "/tag_groups/#{ id }", params: {
-        name: 'renamed', description: 'after', members: [], placements: [] }, headers:, as: :json
-    expect(response).to have_http_status(:ok)
-    expect(json.fetch('id')).to eq(id)
-    expect(TagGroup.find(id).description).to eq('after')
-    expect(TagGroup.find(other_id).attributes).to eq(other)
-    expect(TagGroup.count).to eq(2)
-  end
-
-  it 'preserves description identity on a compatibility update' do
-    tag = create(:tag, primary_name: 'existing_description')
-    page = seed_wiki_page(tag_name: tag.tag_name('ja'), body: 'before', created_by_user: user)
-    description = TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-    id = description.id
-    put "/wiki/#{ id }", params: {
-        title: tag.name('ja'), body: 'after', base_revision_id: page.current_revision.id },
-        headers: headers
-    expect(response).to have_http_status(:ok)
-    expect(description.reload.id).to eq(id)
-    expect(description.body).to eq('after')
-    expect(TagDescription.count).to eq(1)
-  end
-end

backend/spec/requests/tag_wiki_history_integrity_spec.rb

@@ -1,7 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe 'Tag and wiki history integrity', type: :request do
-  include WikiRecords
   let(:member_user) { create(:user, role: 'member') }
 
   def stub_current_user user
@@ -14,7 +13,7 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
   end
 
   def create_wiki_for_tag! tag:, body: 'wiki body', user: member_user
-    seed_wiki_page(
+    Wiki::Commit.create_content!(
         tag_name: primary_tag_name_for(tag, 'ja'),
         body:,
         created_by_user: user,
@@ -26,10 +25,9 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
   end
 
   describe 'PATCH /tags/:id' do
-    it 'renames the current Wiki resource without adding body history' do
+    it 'records wiki_version when tag name changes and tag has wiki' do
       tag = create_tag!(name: 'patch_tag_wiki_before')
       wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-      wiki_history = wiki_page.wiki_versions.map(&:attributes)
 
       expect {
         patch "/tags/#{ tag.id }", params: {
@@ -37,17 +35,23 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
         }
       }
           .to change(TagVersion, :count).by(2)
-          .and change(WikiVersion, :count).by(0)
+          .and change(WikiVersion, :count).by(1)
 
       expect(response).to have_http_status(:ok)
 
       tag.reload
       wiki_page.reload
+      version = wiki_page.wiki_versions.order(:version_no).last
 
       expect(primary_tag_name_for(tag, 'ja').name).to eq('patch_tag_wiki_after')
       expect(wiki_page.title).to eq('patch_tag_wiki_after')
 
-      expect(wiki_page.wiki_versions.reload.map(&:attributes)).to eq(wiki_history)
+      expect(version).to have_attributes(
+        event_type: 'update',
+        title: 'patch_tag_wiki_after',
+        body: 'wiki body before',
+        created_by_user_id: member_user.id
+      )
     end
 
     it 'does not record wiki_version when only category changes' do
@@ -75,10 +79,9 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
   end
 
   describe 'PUT /tags/:id' do
-    it 'renames the current Wiki resource without adding body history' do
+    it 'records wiki_version when tag name changes and tag has wiki' do
       tag = create_tag!(name: 'put_tag_wiki_before')
       wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-      wiki_history = wiki_page.wiki_versions.map(&:attributes)
 
       expect {
         put "/tags/#{ tag.id }", params: {
@@ -90,17 +93,23 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
         }
       }
           .to change(TagVersion, :count).by(2)
-          .and change(WikiVersion, :count).by(0)
+          .and change(WikiVersion, :count).by(1)
 
       expect(response).to have_http_status(:ok)
 
       tag.reload
       wiki_page.reload
+      version = wiki_page.wiki_versions.order(:version_no).last
 
       expect(primary_tag_name_for(tag, 'ja').name).to eq('put_tag_wiki_after')
       expect(wiki_page.title).to eq('put_tag_wiki_after')
 
-      expect(wiki_page.wiki_versions.reload.map(&:attributes)).to eq(wiki_history)
+      expect(version).to have_attributes(
+        event_type: 'update',
+        title: 'put_tag_wiki_after',
+        body: 'wiki body before',
+        created_by_user_id: member_user.id
+      )
     end
 
     it 'does not record wiki_version when only category changes' do

backend/spec/requests/tags_spec.rb

@@ -38,22 +38,6 @@ RSpec.describe 'Tags API', type: :request do
   end
 
   describe 'GET /tags' do
-    it 'serialises descriptions and parents without loading legacy Wiki pages' do
-      TagDescription.create!(tag:, language_code: 'ja', body: '', version_no: 1)
-      TagDescription.create!(tag: tag2, language_code: 'ja', body: '', version_no: 1)
-      TagImplication.create!(tag:, parent_tag: tag2)
-      queries = []
-      subscriber = ->(*args) { queries << args.last.fetch(:sql) }
-      ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') do
-        get '/tags', params: { name: 'spec_tag' }
-      end
-      expect(response).to have_http_status(:ok)
-      row = response_tags.sole
-      expect(row.fetch('has_wiki')).to be(true)
-      expect(row.fetch('parents').sole.fetch('has_wiki')).to be(true)
-      expect(queries.grep(/\bSELECT\b.*\bwiki_(pages|revisions|versions)\b/im)).to be_empty
-    end
-
     it 'includes legacy external JSON alongside an internal tag with the same id' do
       external = create(:external_tag, id: tag.id, name: 'spec_external', post_count: 3)
 
@@ -743,7 +727,7 @@ RSpec.describe 'Tags API', type: :request do
         expect(tag.reload.category).to eq('general')
       end
 
-      it 'PATCH の名称変更で Wiki の本文履歴を追加しない' do
+      it 'PATCH で tag の name を変更すると対応する wiki version を作成する' do
         wiki_page =
             Wiki::Commit.create_content!(
                 tag_name: primary_tag_name_for(tag, 'ja'),
@@ -751,20 +735,24 @@ RSpec.describe 'Tags API', type: :request do
                 created_by_user: member_user,
                 message: 'init')
 
-        wiki_history = wiki_page.wiki_versions.map(&:attributes)
-
         expect {
           patch "/tags/#{ tag.id }", params: {
             name: 'patch_wiki_renamed_tag',
           }
         }
             .to change(TagVersion, :count).by(2)
-            .and change(WikiVersion, :count).by(0)
+            .and change(WikiVersion, :count).by(1)
 
         expect(response).to have_http_status(:ok)
 
-        expect(wiki_page.reload.title).to eq('patch_wiki_renamed_tag')
-        expect(wiki_page.wiki_versions.reload.map(&:attributes)).to eq(wiki_history)
+        version = wiki_page.reload.wiki_versions.order(:version_no).last
+
+        expect(version).to have_attributes(
+          event_type: 'update',
+          title: 'patch_wiki_renamed_tag',
+          body: 'wiki body before',
+          created_by_user_id: member_user.id
+        )
       end
 
       it 'tag の category だけを変更しても wiki version は作成しない' do
@@ -1392,7 +1380,7 @@ RSpec.describe 'Tags API', type: :request do
         expect(system_tag.category).to eq(old_category)
       end
 
-      it 'Wiki を持つ Tag の名称変更で本文履歴を追加しない' do
+      it 'wiki を持つ tag を更新すると wiki version も作成する' do
         wiki_page =
             Wiki::Commit.create_content!(
                 tag_name: primary_tag_name_for(tag, 'ja'),
@@ -1407,8 +1395,6 @@ RSpec.describe 'Tags API', type: :request do
           message: 'init'
         )
 
-        wiki_history = wiki_page.wiki_versions.map(&:attributes)
-
         expect {
           put "/tags/#{ tag.id }", params: {
             name: 'put_wiki_version_tag',
@@ -1419,12 +1405,18 @@ RSpec.describe 'Tags API', type: :request do
           }
         }
             .to change(TagVersion, :count).by(2)
-            .and change(WikiVersion, :count).by(0)
+            .and change(WikiVersion, :count).by(1)
 
         expect(response).to have_http_status(:ok)
 
-        expect(wiki_page.reload.title).to eq('put_wiki_version_tag')
-        expect(wiki_page.wiki_versions.reload.map(&:attributes)).to eq(wiki_history)
+        version = wiki_page.reload.wiki_versions.order(:version_no).last
+
+        expect(version).to have_attributes(
+          event_type: 'update',
+          title: 'put_wiki_version_tag',
+          body: 'wiki body before',
+          created_by_user_id: member_user.id
+        )
       end
 
       it 'wiki を持つ tag を旧 alias へ戻しても wiki を新しい正本名へ移す' do
@@ -1434,7 +1426,6 @@ RSpec.describe 'Tags API', type: :request do
                 body: 'wiki body before',
                 created_by_user: member_user,
                 message: 'init')
-        wiki_history = wiki_page.wiki_versions.map(&:attributes)
 
         expect {
           put "/tags/#{ tag.id }", params: {
@@ -1454,7 +1445,7 @@ RSpec.describe 'Tags API', type: :request do
           }
         }
             .to change(TagVersion, :count).by(3)
-            .and change(WikiVersion, :count).by(0)
+            .and change(WikiVersion, :count).by(2)
 
         expect(response).to have_http_status(:ok)
 
@@ -1466,8 +1457,10 @@ RSpec.describe 'Tags API', type: :request do
         expect(TagName.find_by!(language_code: 'ja', name: 'put_wiki_roundtrip_b'))
             .to have_attributes(tag_id: tag.id, primary_flg: false)
 
-        expect(wiki_page.title).to eq('spec_tag')
-        expect(wiki_page.wiki_versions.reload.map(&:attributes)).to eq(wiki_history)
+        versions = wiki_page.wiki_versions.order(:version_no).last(2)
+
+        expect(versions.map(&:event_type)).to eq(['update', 'update'])
+        expect(versions.map(&:title)).to eq(['put_wiki_roundtrip_b', 'spec_tag'])
       end
 
       it '別名を他 tag から奪った場合、奪はれた側の tag version も作成する' do
@@ -1577,7 +1570,7 @@ RSpec.describe 'Tags API', type: :request do
         expect(TagImplication.where(tag:, parent_tag: child)).not_to exist
       end
 
-      it 'Tag の名称変更で Wiki の本文履歴を追加しない' do
+      it 'tag の name を変更すると対応する wiki version を作成する' do
         wiki_page =
             Wiki::Commit.create_content!(
                 tag_name: primary_tag_name_for(tag, 'ja'),
@@ -1585,8 +1578,6 @@ RSpec.describe 'Tags API', type: :request do
                 created_by_user: member_user,
                 message: 'init')
 
-        wiki_history = wiki_page.wiki_versions.map(&:attributes)
-
         expect {
           put "/tags/#{ tag.id }", params: {
             name: 'put_wiki_renamed_tag',
@@ -1597,12 +1588,18 @@ RSpec.describe 'Tags API', type: :request do
           }
         }
             .to change(TagVersion, :count).by(2)
-            .and change(WikiVersion, :count).by(0)
+            .and change(WikiVersion, :count).by(1)
 
         expect(response).to have_http_status(:ok)
 
-        expect(wiki_page.reload.title).to eq('put_wiki_renamed_tag')
-        expect(wiki_page.wiki_versions.reload.map(&:attributes)).to eq(wiki_history)
+        version = wiki_page.reload.wiki_versions.order(:version_no).last
+
+        expect(version).to have_attributes(
+          event_type: 'update',
+          title: 'put_wiki_renamed_tag',
+          body: 'wiki body before',
+          created_by_user_id: member_user.id
+        )
       end
     end
   end

backend/spec/requests/wiki_conflict_spec.rb

@@ -1,7 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe 'Wiki conflict handling', type: :request do
-  include WikiRecords
   let!(:user) { create_member_user! }
 
   def auth_headers user
@@ -10,8 +9,8 @@ RSpec.describe 'Wiki conflict handling', type: :request do
 
   it 'returns 409 when base_revision_id is stale' do
     page =
-        seed_wiki_page(
-            tag_name: create(:tag, primary_name: 'wiki_conflict_request').tag_name('ja'),
+        Wiki::Commit.create_content!(
+            tag_name: create(:tag_name, name: 'wiki_conflict_request'),
             body: 'first',
             created_by_user: user,
             message: 'init')
@@ -26,10 +25,12 @@ RSpec.describe 'Wiki conflict handling', type: :request do
         base_revision_id: stale_id)
 
     put "/wiki/#{ page.id }",
-        params: { title: 'wiki_conflict_request',
-                  body: 'third',
-                  message: 'stale',
-                  base_revision_id: stale_id },
+        params: {
+          title: 'wiki_conflict_request',
+          body: 'third',
+          message: 'stale',
+          base_revision_id: stale_id,
+        },
         headers: auth_headers(user)
 
     expect(response).to have_http_status(:conflict)

backend/spec/requests/wiki_creation_freeze_spec.rb

@@ -1,63 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki creation freeze', type: :request do
-  include TagGroupRecords
-  include WikiRecords
-
-  let!(:user) { create_member_user! }
-  let(:headers) { { 'X-Transfer-Code' => user.inheritance_code } }
-
-  it 'creates missing compatibility history when updating an independent group' do
-    id = seed_group(name: 'independent', description: 'before')
-    expect do
-      put "/tag_groups/#{ id }", params: {
-          name: 'independent', description: 'after', members: [], placements: [] },
-          headers:, as: :json
-    end.to change(WikiPage, :count).by(1)
-        .and change(WikiRevision, :count).by(1)
-        .and change(WikiVersion, :count).by(1)
-    expect(response).to have_http_status(:ok)
-    expect(TagGroup.find(id).description).to eq('after')
-    page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'タググループ:independent' })
-    expect(page.body).to include('after')
-    expect(page.current_revision.body).to eq(page.body)
-    expect(page.wiki_versions.sole.body).to eq(page.body)
-  end
-
-  context 'existing description write protection' do
-    let!(:tag) { create(:tag, primary_name: 'protected_description') }
-    let!(:page) do
-      seed_wiki_page(tag_name: tag.tag_name('ja'), body: 'before', created_by_user: user)
-    end
-
-    [nil, :guest, :banned].each do |role|
-      it "rejects #{ role || 'anonymous' } without changing either history" do
-        actor = role && create(:user, role == :banned ? :member : role)
-        actor.update!(banned_at: Time.current) if role == :banned
-        request_headers = actor ? { 'X-Transfer-Code' => actor.inheritance_code } : { }
-        before_state = group_state
-        put "/wiki/#{ page.id }", params: { title: tag.name('ja'), body: 'after' },
-            headers: request_headers
-        expect(response).to have_http_status(role ? :forbidden : :unauthorized)
-        expect(group_state).to eq(before_state)
-      end
-    end
-
-    it 'rejects banned IPs without writes' do
-      IpAddress.create!(ip_address: IPAddr.new('127.0.0.1').hton, banned_at: Time.current)
-      before_state = group_state
-      put "/wiki/#{ page.id }", params: { title: tag.name('ja'), body: 'after' }, headers: headers
-      expect(response).to have_http_status(:forbidden)
-      expect(group_state).to eq(before_state)
-    end
-
-    ['', "\r\n\r\n"].each do |body|
-      it "rejects invalid description body #{ body.inspect } atomically" do
-        before_state = group_state
-        put "/wiki/#{ page.id }", params: { title: tag.name('ja'), body: }, headers: headers
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(group_state).to eq(before_state)
-      end
-    end
-  end
-end

backend/spec/requests/wiki_history_integrity_spec.rb

@@ -2,7 +2,6 @@ require 'cgi'
 require 'rails_helper'
 
 RSpec.describe 'Wiki history integrity', type: :request do
-  include WikiRecords
   let!(:user) { create_member_user! }
 
   def auth_headers user
@@ -10,29 +9,56 @@ RSpec.describe 'Wiki history integrity', type: :request do
   end
 
   def create_wiki_page title:, body: 'body', message: 'init', user: self.user
-    seed_wiki_page(
-        tag_name: create(:tag, primary_name: title).tag_name('ja'),
+    Wiki::Commit.create_content!(
+        tag_name: create(:tag_name, name: title),
         body:,
         created_by_user: user,
         message:)
   end
 
   describe 'POST /wiki' do
-    it 'rejects frozen creation without partial page or history' do
-      expect do
-        post '/wiki', params: { title: 'Help:wiki_history_create_atomic', body: 'initial' },
+    it 'creates wiki_page, wiki_revision, and wiki_version atomically' do
+      expect {
+        post '/wiki',
+             params: {
+               title: 'wiki_history_create_atomic',
+               body: "a\nb\nc",
+               message: 'initial commit',
+             },
              headers: auth_headers(user)
-      end.to change(WikiPage, :count).by(0)
-          .and change(WikiRevision, :count).by(0)
-          .and change(WikiVersion, :count).by(0)
-      expect(response.status).to be_between(400, 499)
+      }
+          .to change(WikiPage, :count).by(1)
+          .and change(WikiRevision, :count).by(1)
+          .and change(WikiVersion, :count).by(1)
+
+      expect(response).to have_http_status(:created)
+
+      page = WikiPage.find(json.fetch('id'))
+      revision = page.current_revision
+      version = page.wiki_versions.order(:version_no).last
+
+      expect(page.title).to eq('wiki_history_create_atomic')
+      expect(page.body).to eq("a\nb\nc")
+
+      expect(revision).to be_content
+      expect(revision.message).to eq('initial commit')
+      expect(revision.lines_count).to eq(3)
+
+      expect(version).to have_attributes(
+        version_no: 1,
+        event_type: 'create',
+        title: 'wiki_history_create_atomic',
+        body: "a\nb\nc",
+        reason: 'initial commit',
+        created_by_user_id: user.id
+      )
     end
 
     it 'returns 422 and creates nothing when normalised body is blank' do
       expect {
         post '/wiki',
              params: {
-               title: 'Help:wiki_history_blank_body',
+               title: 'wiki_history_blank_body',
                body: "\r\n\r\n",
                message: 'blank',
              },
@@ -41,25 +67,25 @@ RSpec.describe 'Wiki history integrity', type: :request do
           .not_to change(WikiPage, :count)
 
       expect(response).to have_http_status(:unprocessable_entity)
-      expect(WikiPage.joins(:tag_name)
-          .where(tag_names: { name: 'Help:wiki_history_blank_body' })).not_to exist
+      expect(WikiPage.joins(:tag_name).where(tag_names: { name: 'wiki_history_blank_body' })).not_to exist
     end
 
-    it 'rejects frozen creation without modifying an existing page or history' do
-      create_wiki_page(title: 'Help:wiki_history_duplicate_title', body: 'first')
+    it 'returns 422 and creates no partial page when title already exists' do
+      create_wiki_page(title: 'wiki_history_duplicate_title', body: 'first')
 
-      expect do
+      expect {
         post '/wiki',
-             params: { title: 'Help:wiki_history_duplicate_title',
-                       body: 'second', message: 'duplicate' },
+             params: {
+               title: 'wiki_history_duplicate_title',
+               body: 'second',
+               message: 'duplicate',
+             },
              headers: auth_headers(user)
-      end.to change(WikiPage, :count).by(0)
-          .and change(WikiRevision, :count).by(0)
-          .and change(WikiVersion, :count).by(0)
+      }
+          .not_to change(WikiPage, :count)
 
-      expect(response.status).to be_between(400, 499)
-      expect(WikiPage.joins(:tag_name)
-          .where(tag_names: { name: 'Help:wiki_history_duplicate_title' }).count).to eq(1)
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(WikiPage.joins(:tag_name).where(tag_names: { name: 'wiki_history_duplicate_title' }).count).to eq(1)
     end
   end
 

backend/spec/requests/wiki_index_order_spec.rb

@@ -1,42 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki resource ordering', type: :request do
-  include TagGroupRecords
-  let(:user) { create_member_user! }
-
-  it 'selects the latest twenty across both resources before applying the global limit' do
-    start = Time.utc(2026, 1, 1)
-    descriptions = 24.times.map do |index|
-      tag = create(:tag, primary_name: "rank_#{ index }")
-      TagDescription.create!(tag:, language_code: 'ja', body: 'current', version_no: 1,
-                             updated_at: start + index.hours)
-    end
-    groups = [24, 25].map do |hour|
-      group = TagGroup.find(seed_group(name: "rank_group_#{ hour }"))
-      group.update_columns(updated_at: start + hour.hours)
-      group
-    end
-
-    get '/wiki', params: { title: 'rank' }
-
-    expect(response).to have_http_status(:ok)
-    expected = groups.reverse.map { ['tag_group', _1.id] } +
-        descriptions.last(18).reverse.map { ['tag_description', _1.id] }
-    expect(json.map { [_1.fetch('resource_type'), _1.fetch('id')] }).to eq(expected)
-  end
-
-  it 'breaks timestamp ties by resource kind and ID while retaining legacy overlaps' do
-    time = Time.utc(2026, 1, 1)
-    tag = create(:tag, primary_name: 'tied')
-    TagDescription.create!(id: 51, tag:, language_code: 'ja', body: 'current',
-                           version_no: 1, updated_at: time)
-    group = TagGroup.find(seed_group(name: 'tied', id: 51))
-    group.update_columns(updated_at: time)
-
-    2.times do
-      get '/wiki', params: { title: 'tied' }
-      expect(json.map { [_1.fetch('resource_type'), _1.fetch('id')] })
-          .to eq([['tag_description', 51], ['tag_group', 51]])
-    end
-  end
-end

backend/spec/requests/wiki_spec.rb

@@ -4,7 +4,6 @@ require 'securerandom'
 
 
 RSpec.describe 'Wiki API', type: :request do
-  include WikiRecords
   def auth_headers(user)
     { 'X-Transfer-Code' => user.inheritance_code }
   end
@@ -12,19 +11,19 @@ RSpec.describe 'Wiki API', type: :request do
   let!(:user) { create_member_user! }
 
   let!(:tn) { create(:tag_name, name: 'spec_wiki_title') }
+  let!(:page) do
+    Wiki::Commit.create_content!(
+        tag_name: tn,
+        body: 'init',
+        created_by_user: user,
+        message: 'init')
+  end
   let!(:tag) do
     create(:tag,
         primary_tag_name: tn,
         category: :general,
         deprecated_at: Time.zone.local(2026, 6, 1))
   end
-  let!(:page) do
-    seed_wiki_page(
-        tag_name: tn,
-        body: 'init',
-        created_by_user: user,
-        message: 'init')
-  end
 
   describe 'GET /wiki' do
     it 'returns wiki pages with title' do
@@ -109,14 +108,93 @@ RSpec.describe 'Wiki API', type: :request do
       end
     end
 
-    ['Help:TestPage', 'ヘルプ:ホーム'].each do |title|
-      it "rejects frozen creation of #{ title } without history writes" do
+    context 'when success' do
+      it 'creates wiki_page and first content revision' do
         expect do
-          post endpoint, params: { title:, body: 'initial' }, headers: auth_headers(member)
-        end.to change(WikiPage, :count).by(0)
-            .and change(WikiRevision, :count).by(0)
-            .and change(WikiVersion, :count).by(0)
-        expect(response.status).to be_between(400, 499)
+          post endpoint, params: { title: 'TestPage', body: "a\nb\nc", message: 'init' },
+                         headers: auth_headers(member)
+        end
+            .to change(WikiPage, :count).by(1)
+            .and change(WikiRevision, :count).by(1)
+            .and change(WikiVersion, :count).by(1)
+
+        expect(response).to have_http_status(:created)
+
+        page_id = json.fetch('id')
+        expect(json.fetch('title')).to eq('TestPage')
+
+        created_page = WikiPage.find(page_id)
+        version = created_page.wiki_versions.order(:version_no).last
+
+        expect(version).to have_attributes(
+          version_no: 1,
+          event_type: 'create',
+          title: 'TestPage',
+          body: "a\nb\nc",
+          created_by_user_id: member.id
+        )
+
+        rev = created_page.current_revision
+        expect(rev).to be_present
+        expect(rev).to be_content
+        expect(rev.message).to eq('init')
+
+        expect(created_page.body).to eq("a\nb\nc")
+
+        expect(rev.lines_count).to eq(3)
+        expect(rev.wiki_revision_lines.order(:position).pluck(:position)).to eq([0, 1, 2])
+        expect(rev.wiki_lines.pluck(:body)).to match_array(['a', 'b', 'c'])
+      end
+
+      it 'reuses existing WikiLine rows by sha256' do
+        # 先に同じ行を作っておく
+        WikiLine.create!(sha256: Digest::SHA256.hexdigest('a'), body: 'a', created_at: Time.current, updated_at: Time.current)
+
+        post endpoint,
+             params: { title: 'Reuse', body: "a\na" },
+             headers: auth_headers(member)
+
+        page = WikiPage.find(JSON.parse(response.body).fetch('id'))
+        rev = page.current_revision
+        expect(rev.lines_count).to eq(2)
+
+        # "a" の WikiLine が増殖しない（1行のはず）
+        expect(WikiLine.where(body: 'a').count).to eq(1)
+      end
+
+      it 'deduplicates duplicated new lines before upsert' do
+        duplicated = 'duplicated_line_for_wiki_line_upsert_spec'
+
+        post endpoint,
+             params: { title: 'DuplicateNewLine', body: "#{ duplicated }\n#{ duplicated }" },
+             headers: auth_headers(member)
+
+        expect(response).to have_http_status(:created)
+
+        page = WikiPage.find(json.fetch('id'))
+        rev = page.current_revision
+
+        expect(rev.lines_count).to eq(2)
+        expect(WikiLine.where(body: duplicated).count).to eq(1)
+        expect(rev.wiki_revision_lines.count).to eq(2)
+        expect(rev.wiki_revision_lines.pluck(:wiki_line_id).uniq.size).to eq(1)
+      end
+
+      it 'normalises CRLF and strips trailing newlines' do
+        post endpoint,
+             params: { title: 'NormalisedBody', body: "a\r\nb\r\n\r\n", message: 'normalise' },
+             headers: auth_headers(member)
+
+        expect(response).to have_http_status(:created)
+
+        page = WikiPage.find(json.fetch('id'))
+        rev = page.current_revision
+        version = page.wiki_versions.order(:version_no).last
+
+        expect(page.body).to eq("a\nb")
+        expect(version.body).to eq("a\nb")
+        expect(rev.lines_count).to eq(2)
+        expect(rev.wiki_lines.order('wiki_revision_lines.position').map(&:body)).to eq(['a', 'b'])
       end
     end
   end
@@ -129,10 +207,10 @@ RSpec.describe 'Wiki API', type: :request do
       { 'X-Transfer-Code' => user.inheritance_code }
     end
 
-    let!(:test_tag_name) { create(:tag, primary_name: 'TestPage').tag_name('ja') }
+    let!(:test_tag_name) { create(:tag_name, name: 'TestPage') }
 
     let!(:page) do
-      seed_wiki_page(
+      Wiki::Commit.create_content!(
           tag_name: test_tag_name,
           body: "a\nb",
           created_by_user: member,
@@ -170,8 +248,7 @@ RSpec.describe 'Wiki API', type: :request do
 
         expect do
           put "/wiki/#{page.id}",
-              params: { title: 'TestPage', body: "x\ny", message: 'edit',
-                        base_revision_id: current_id },
+              params: { title: 'TestPage', body: "x\ny", message: 'edit', base_revision_id: current_id },
               headers: auth_headers(member)
         end
             .to change(WikiRevision, :count).by(1)
@@ -206,7 +283,7 @@ RSpec.describe 'Wiki API', type: :request do
             created_by_user: member)
 
         linked_page =
-            seed_wiki_page(
+            Wiki::Commit.create_content!(
                 tag_name: linked_tag_name,
                 body: 'before',
                 created_by_user: member,
@@ -280,14 +357,13 @@ RSpec.describe 'Wiki API', type: :request do
 
   describe 'GET /wiki/search' do
     before do
-      search_tag = create(:tag, primary_name: 'spec_wiki_title_2')
-      seed_wiki_page(
-          tag_name: search_tag.tag_name('ja'),
+      Wiki::Commit.create_content!(
+          tag_name: create(:tag_name, name: 'spec_wiki_title_2'),
           body: 'search body 2',
           created_by_user: user,
           message: 'init')
 
-      seed_wiki_page(
+      Wiki::Commit.create_content!(
           tag_name: create(:tag_name, name: 'unrelated_title'),
           body: 'unrelated body',
           created_by_user: user,
@@ -337,10 +413,10 @@ RSpec.describe 'Wiki API', type: :request do
       top = json.first
       expect(top).to include(
         'revision_id' => rev2.id,
-        'pred' => rev1.id,
+        'pred' => rev2.base_revision_id,
         'succ' => nil,
         'kind' => 'content',
-        'message' => nil
+        'message' => 'r2'
       )
       expect(top['wiki_page']).to include(
         'id' => page.id,
@@ -439,7 +515,7 @@ RSpec.describe 'Wiki API', type: :request do
     it 'raises because redirect revisions are deprecated' do
       target_tag_name = create(:tag_name, name: 'redirect_deprecated_target')
       target =
-          seed_wiki_page(
+          Wiki::Commit.create_content!(
               tag_name: target_tag_name,
               body: 'target',
               created_by_user: user,
@@ -462,7 +538,7 @@ RSpec.describe 'Wiki API', type: :request do
     linked_tag = create(:tag, primary_tag_name: linked_tag_name, category: :general)
 
     linked_page =
-        seed_wiki_page(
+        Wiki::Commit.create_content!(
             tag_name: linked_tag_name,
             body: 'before',
             created_by_user: user,

backend/spec/requests/wiki_title_collision_spec.rb

@@ -1,7 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe 'Wiki title collision', type: :request do
-  include WikiRecords
   let!(:user) { create_member_user! }
 
   def auth_headers user
@@ -9,7 +8,7 @@ RSpec.describe 'Wiki title collision', type: :request do
   end
 
   def create_wiki_page title:, body:
-    seed_wiki_page(
+    Wiki::Commit.create_content!(
         tag_name: create(:tag_name, name: title),
         body:,
         created_by_user: user,
@@ -44,18 +43,20 @@ RSpec.describe 'Wiki title collision', type: :request do
     expect(source.wiki_versions.count).to eq(source_version_count)
   end
 
-  it 'rejects frozen creation with an existing title without adding history' do
-    create_wiki_page(title: 'Help:wiki_collision_create', body: 'already exists')
+  it 'returns 422 when creating wiki with existing title' do
+    create_wiki_page(title: 'wiki_collision_create', body: 'already exists')
 
-    expect do
+    expect {
       post '/wiki',
-           params: { title: 'Help:wiki_collision_create', body: 'new body',
-                     message: 'duplicate create' },
+           params: {
+             title: 'wiki_collision_create',
+             body: 'new body',
+             message: 'duplicate create',
+           },
            headers: auth_headers(user)
-    end.to change(WikiPage, :count).by(0)
-        .and change(WikiRevision, :count).by(0)
-        .and change(WikiVersion, :count).by(0)
+    }
+        .not_to change(WikiPage, :count)
 
-    expect(response.status).to be_between(400, 499)
+    expect(response).to have_http_status(:unprocessable_entity)
   end
 end

backend/spec/requests/wiki_unmigrated_contract_spec.rb

@@ -1,78 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Unmigrated Wiki compatibility', type: :request do
-  include WikiRecords
-  let!(:user) { create_member_user! }
-  let!(:tag_name) { create(:tag_name, name: 'Help_contract') }
-  let!(:page) do
-    seed_wiki_page(tag_name:, body: 'before', created_by_user: user)
-  end
-  let!(:first_revision) { page.current_revision }
-  let!(:last_revision) do
-    Wiki::Commit.legacy_content!(page:, body: 'after', created_user: user,
-                                 message: 'legacy edit', base_revision_id: first_revision.id)
-  end
-
-  before { expect(TagDescription.exists?(id: page.id)).to be(false) }
-
-  it 'rejects standalone updates even after a Tag is linked to the legacy page' do
-    create(:tag, primary_tag_name: tag_name)
-    original = page.reload.attributes
-
-    expect do
-      put "/wiki/#{ page.id }",
-          params: { title: 'legacy_tag_renamed', body: 'changed legacy body',
-                    message: 'legacy rename', base_revision_id: last_revision.id },
-          headers: { 'X-Transfer-Code' => user.inheritance_code }
-    end.to change(WikiRevision, :count).by(0)
-        .and change(WikiVersion, :count).by(0)
-        .and change(TagDescription, :count).by(0)
-        .and change(TagDescriptionVersion, :count).by(0)
-
-    expect(response).to have_http_status(:unprocessable_entity)
-    expect(page.reload.attributes).to eq(original)
-    expect(page.current_revision).to have_attributes(message: 'legacy edit')
-  end
-
-  include TagGroupRecords
-
-  [:id, :title].each do |lookup|
-    [nil, :historical].each do |edition|
-      it "rejects legacy #{ lookup } #{ edition || 'current' } without legacy SELECTs" do
-        path = lookup == :id ? "/wiki/#{ page.id }" : "/wiki/title/#{ tag_name.name }"
-        params = edition ? { version: first_revision.id } : { }
-        without_group_legacy_reads { get path, params: }
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    it "does not recognise legacy #{ lookup } existence" do
-      path = lookup == :id ? "/wiki/#{ page.id }" : "/wiki/title/#{ tag_name.name }"
-      without_group_legacy_reads { get "#{ path }/exists" }
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  ['/wiki', '/wiki/search', '/wiki/changes'].each do |path|
-    it "excludes unmigrated content from #{ path } without legacy SELECTs" do
-      without_group_legacy_reads { get path }
-      expect(response).to have_http_status(:ok)
-      expect(json).to eq([])
-    end
-  end
-
-  it 'returns empty scoped history without legacy SELECTs' do
-    without_group_legacy_reads { get '/wiki/changes', params: { id: page.id } }
-    expect(response).to have_http_status(:ok)
-    expect(json).to eq([])
-  end
-
-  [false, true].each do |explicit|
-    it "rejects legacy diff with #{ explicit ? 'explicit' : 'current' } target" do
-      params = { from: first_revision.id }
-      params[:to] = last_revision.id if explicit
-      without_group_legacy_reads { get "/wiki/#{ page.id }/diff", params: }
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-end

backend/spec/services/shared_resource_id_allocator_mysql_spec.rb

@@ -1,143 +0,0 @@
-require 'rails_helper'
-require 'timeout'
-
-RSpec.describe 'Shared resource IDs across MySQL connections', type: :model do
-  self.use_transactional_tests = false
-
-  before do
-    expect(Rails.env.test?).to be(true)
-    expect(ApplicationRecord.connection.adapter_name).to match(/mysql/i)
-    expect(ApplicationRecord.connection_pool.size).to be >= 3
-    @prefix = "shared_ids_#{ SecureRandom.hex(8) }"
-    @names = [0, 1].map { create(:tag_name, name: "#{ @prefix }_#{ _1 }") }
-    @tag = Tag.create!(tag_name_id: @names.first.id, category: :general)
-    @names.first.update!(tag_id: @tag.id)
-    @threads = []
-    @release = Queue.new
-  end
-
-  after do
-    @release << true if @release
-    begin
-      Array(@threads).each do |thread|
-        raise 'Shared ID worker did not finish' unless thread.join(15)
-      end
-    ensure
-      if @prefix
-        ExternalTag.where(name: "#{ @prefix }_external").delete_all
-        TagGroup.where(name: "#{ @prefix }_group").delete_all
-      end
-      TagDescription.where(tag_id: @tag.id).delete_all if @tag
-      if @names
-        ids = @names.map(&:id)
-        TagName.where(id: ids).update_all(tag_id: nil)
-        Tag.where(tag_name_id: ids).delete_all
-        TagName.where(id: ids).delete_all
-      end
-    end
-  end
-
-  def await_queue queue
-    Timeout.timeout(15) { queue.pop }
-  end
-
-  def worker &block
-    Thread.new do
-      Thread.current.report_on_exception = false
-      ApplicationRecord.connection_pool.with_connection(&block)
-    end.tap { @threads << _1 }
-  end
-
-  def create_resource kind
-    case kind
-    when :tag
-      Tag.create!(tag_name_id: @names.last.id, category: :general)
-    when :external
-      ExternalTag.create!(platform: :nico, name: "#{ @prefix }_external")
-    when :description
-      TagDescription.create!(tag: @tag, language_code: 'ja', body: '', version_no: 1)
-    when :group
-      TagGroup.create!(name: "#{ @prefix }_group", version_no: 1)
-    end
-  end
-
-  def hold_creation kind, rollback: false
-    ready = Queue.new
-    thread = worker do |connection|
-      id = nil
-      connection.transaction do
-        lock_name = nil
-        subscriber = lambda do |*args|
-          match = args.last.fetch(:sql).match(/GET_LOCK\('([^']+)'/)
-          lock_name = match[1] if match
-        end
-        ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') do
-          id = create_resource(kind).id
-        end
-        ready << [id, connection.select_value('SELECT CONNECTION_ID()').to_i, lock_name]
-        await_queue(@release)
-        raise ActiveRecord::Rollback if rollback
-      end
-      id
-    end
-    [thread, await_queue(ready)]
-  end
-
-  def result thread
-    raise 'Shared ID worker did not finish' unless thread.join(15)
-    thread.value
-  end
-
-  { tags: [:external, :tag], wiki: [:description, :group] }.each do |space, kinds|
-    [false, true].each do |rollback|
-      it "serialises #{ space } inserts through #{ rollback ? 'rollback' : 'commit' }" do
-        tables = SharedResourceIdAllocator::SPACES.fetch(space.to_s)
-        maxima = tables.map do |table|
-          ApplicationRecord.connection.select_value("SELECT MAX(id) FROM #{ table }").to_i
-        end
-        first, (first_id, connection_id, lock_name) = hold_creation(kinds.first, rollback:)
-        expect(first_id).to eq(maxima.max + 1)
-        connection = ApplicationRecord.connection
-        quoted_lock = connection.quote(lock_name)
-        expect(connection.select_value("SELECT IS_USED_LOCK(#{ quoted_lock })").to_i)
-            .to eq(connection_id)
-
-        started = Queue.new
-        second = worker do |other|
-          started << other.select_value('SELECT CONNECTION_ID()').to_i
-          create_resource(kinds.last).id
-        end
-        expect(await_queue(started)).not_to eq(connection_id)
-        @release << true
-        expect(result(first)).to eq(first_id)
-        expect(result(second)).to eq(rollback ? first_id : first_id + 1)
-        expect(connection.select_value("SELECT IS_FREE_LOCK(#{ quoted_lock })").to_i).to eq(1)
-      end
-    end
-  end
-
-  it 'allows the other ID space to commit while the first space remains locked' do
-    first, (_id, connection_id, lock_name) = hold_creation(:external)
-    second = worker { create_resource(:group).id }
-    expect(result(second)).to be_positive
-    connection = ApplicationRecord.connection
-    quoted_lock = connection.quote(lock_name)
-    expect(connection.select_value("SELECT IS_USED_LOCK(#{ quoted_lock })").to_i)
-        .to eq(connection_id)
-    @release << true
-    result(first)
-  end
-
-  it 'raises on a real lock acquisition failure without inserting a record' do
-    first, (_id, _connection_id, lock_name) = hold_creation(:external, rollback: true)
-    stub_const('SharedResourceIdAllocator::LOCK_TIMEOUT', 0)
-    expect { create_resource(:external) }.to raise_error(ActiveRecord::LockWaitTimeout)
-    expect(ExternalTag.where(name: "#{ @prefix }_external")).not_to exist
-    @release << true
-    result(first)
-    connection = ApplicationRecord.connection
-    quoted_lock = connection.quote(lock_name)
-    expect(connection.select_value("SELECT IS_FREE_LOCK(#{ quoted_lock })").to_i)
-        .to eq(1)
-  end
-end

backend/spec/services/shared_resource_id_allocator_spec.rb

@@ -1,88 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe SharedResourceIdAllocator do
-  let(:record) { build(:external_tag) }
-  let(:connection) { double('connection') }
-  let(:transaction) { double('transaction', open?: true) }
-  let(:callbacks) { { } }
-  let(:sql) { [] }
-
-  before do
-    config = double('config', database: 'test_shared_ids')
-    allow(connection).to receive_message_chain(:pool, :db_config).and_return(config)
-    allow(connection).to receive(:quote) { "'#{ _1 }'" }
-    allow(connection).to receive(:quote_table_name) { "`#{ _1 }`" }
-    allow(connection).to receive(:select_value) do |statement|
-      sql << statement
-      if statement.include?('GET_LOCK') || statement.include?('RELEASE_LOCK')
-        1
-      elsif statement.include?('`tags`')
-        8
-      else
-        3
-      end
-    end
-    allow(ExternalTag).to receive(:connection).and_return(connection)
-    allow(ExternalTag).to receive(:current_transaction).and_return(transaction)
-    allow(ExternalTag).to receive(:uncached).and_yield
-    [:after_commit, :after_rollback].each do |event|
-      allow(transaction).to receive(event) { |&callback| callbacks[event] = callback }
-    end
-  end
-
-  [:after_commit, :after_rollback].each do |event|
-    it "holds the shared lock until #{ event }" do
-      described_class.assign!(record)
-      expect(record.id).to eq(9)
-      expect(sql.grep(/RELEASE_LOCK/)).to be_empty
-      expect(sql.grep(/FOR UPDATE/).size).to eq(2)
-      callbacks.fetch(event).call
-      expect(sql.grep(/RELEASE_LOCK/).size).to eq(1)
-    end
-  end
-
-  it 'does not silently proceed after an acquisition timeout' do
-    allow(connection).to receive(:select_value).and_return(0)
-    expect { described_class.assign!(record) }.to raise_error(ActiveRecord::LockWaitTimeout)
-    expect(record.id).to be_nil
-    expect(callbacks).to be_empty
-  end
-
-  it 'releases a successfully acquired lock when allocation fails and rolls back' do
-    allow(connection).to receive(:select_value).with(/FOR UPDATE/).and_raise('query failed')
-    expect { described_class.assign!(record) }.to raise_error(RuntimeError, 'query failed')
-    callbacks.fetch(:after_rollback).call
-    expect(sql.grep(/RELEASE_LOCK/).size).to eq(1)
-  end
-
-  it 'preserves explicitly supplied historical IDs' do
-    record.id = 5
-    described_class.assign!(record)
-    expect(record.id).to eq(5)
-    expect(sql.grep(/FOR UPDATE/)).to be_empty
-    callbacks.fetch(:after_commit).call
-  end
-
-  it 'uses the same named lock within each space and different locks between spaces' do
-    locks = [Tag, ExternalTag, TagDescription, TagGroup].map do |model|
-      allow(model).to receive(:connection).and_return(connection)
-      allow(model).to receive(:current_transaction).and_return(transaction)
-      allow(model).to receive(:uncached).and_yield
-      record = model.new(id: 50)
-      described_class.assign!(record)
-      statement = sql.grep(/GET_LOCK/).last
-      callbacks.fetch(:after_commit).call
-      statement
-    end
-    expect(locks[0]).to eq(locks[1])
-    expect(locks[2]).to eq(locks[3])
-    expect(locks[0]).not_to eq(locks[2])
-  end
-
-  it 'reports lock release failures' do
-    described_class.assign!(record)
-    allow(connection).to receive(:select_value).with(/RELEASE_LOCK/).and_return(nil)
-    expect { callbacks.fetch(:after_commit).call }
-        .to raise_error(ActiveRecord::ActiveRecordError, /lock release failed/)
-  end
-end

backend/spec/services/wiki/commit_integrity_spec.rb

@@ -2,42 +2,41 @@ require 'digest'
 require 'rails_helper'
 
 RSpec.describe Wiki::Commit do
-  include WikiRecords
   let(:user) { create_member_user! }
 
   def create_page title:, body: 'initial body'
-    seed_wiki_page(
-        tag_name: create(:tag, primary_name: title).tag_name('ja'),
+    described_class.create_content!(
+        tag_name: create(:tag_name, name: title),
         body:,
         created_by_user: user,
         message: 'init')
   end
 
   describe '.create_content!' do
-    it 'rejects standalone Help creation without adding page or history' do
-      name = create(:tag_name, name: 'Help:frozen_service')
-      counts = [WikiPage.count, WikiRevision.count, WikiVersion.count]
-      expect do
-        described_class.create_content!(tag_name: name, body: 'initial', created_by_user: user)
-      end.to raise_error(ActiveRecord::RecordInvalid)
-      expect([WikiPage.count, WikiRevision.count, WikiVersion.count]).to eq(counts)
-    end
-
-    it 'keeps the internal compatibility writer available' do
-      name = create(:tag_name, name: 'タググループ:compatibility_service')
-      page = nil
-      expect do
-        page = described_class.create_legacy_content!(
-            tag_name: name, body: 'initial', created_by_user: user)
-      end.to change(WikiPage, :count).by(1)
+    it 'creates page, revision, and version with normalised body' do
+      expect {
+        described_class.create_content!(
+            tag_name: create(:tag_name, name: 'commit_integrity_create'),
+            body: "a\r\nb\r\n\r\n",
+            created_by_user: user,
+            message: 'init')
+      }
+          .to change(WikiPage, :count).by(1)
           .and change(WikiRevision, :count).by(1)
           .and change(WikiVersion, :count).by(1)
-      expect(page.current_revision.body).to eq('initial')
-      expect(page.wiki_versions.sole.body).to eq('initial')
+
+      page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'commit_integrity_create' })
+      revision = page.current_revision
+      version = page.wiki_versions.order(:version_no).last
+
+      expect(page.body).to eq("a\nb")
+      expect(revision.lines_count).to eq(2)
+      expect(version.body).to eq("a\nb")
+      expect(version.reason).to eq('init')
     end
 
     it 'rejects body that becomes blank after normalisation' do
-      tag_name = create(:tag, primary_name: 'commit_integrity_blank').tag_name('ja')
+      tag_name = create(:tag_name, name: 'commit_integrity_blank')
 
       expect {
         described_class.create_content!(
@@ -53,17 +52,6 @@ RSpec.describe Wiki::Commit do
   end
 
   describe '.content!' do
-    it 'rejects standalone Help updates without modifying histories' do
-      page = seed_wiki_page(tag_name: create(:tag_name, name: 'Help:standalone'),
-                            body: 'before', created_by_user: user)
-      counts = [WikiRevision.count, WikiVersion.count]
-      expect do
-        described_class.content!(page:, body: 'after', created_user: user)
-      end.to raise_error(ActiveRecord::RecordInvalid)
-      expect(page.reload.body).to eq('before')
-      expect([WikiRevision.count, WikiVersion.count]).to eq(counts)
-    end
-
     it 'updates page body, revision, and version' do
       page = create_page(title: 'commit_integrity_update', body: 'before')
       current_id = page.current_revision.id
@@ -92,7 +80,7 @@ RSpec.describe Wiki::Commit do
       tag = create(:tag, primary_tag_name: tag_name, category: :general)
 
       page =
-          seed_wiki_page(
+          described_class.create_content!(
               tag_name:,
               body: 'before',
               created_by_user: user,

backend/spec/services/wiki/commit_spec.rb

@@ -1,13 +1,12 @@
 require 'rails_helper'
 
 RSpec.describe Wiki::Commit do
-  include WikiRecords
   let(:user) { create_member_user! }
 
   def create_page(title: 'commit_spec_page', body: 'initial body')
-    tag_name = create(:tag, primary_name: title).tag_name('ja')
+    tag_name = create(:tag_name, name: title)
 
-    seed_wiki_page(
+    Wiki::Commit.create_content!(
         tag_name:,
         body:,
         created_by_user: user,
@@ -85,7 +84,7 @@ RSpec.describe Wiki::Commit do
       tag = create(:tag, primary_tag_name: tag_name, category: :general)
 
       page =
-          seed_wiki_page(
+          described_class.create_content!(
               tag_name:,
               body: 'before',
               created_by_user: user,
@@ -112,7 +111,7 @@ RSpec.describe Wiki::Commit do
       tag = create(:tag, primary_tag_name: tag_name, category: :general)
 
       page =
-          seed_wiki_page(
+          described_class.create_content!(
               tag_name:,
               body: 'before',
               created_by_user: user,

backend/spec/services/wiki_version_recorder_spec.rb

@@ -1,11 +1,10 @@
 require 'rails_helper'
 
 RSpec.describe WikiVersionRecorder do
-  include WikiRecords
   let(:user) { create_member_user! }
 
   def create_page title:, body: 'body'
-    seed_wiki_page(
+    Wiki::Commit.create_content!(
         tag_name: create(:tag_name, name: title),
         body:,
         created_by_user: user,

backend/spec/support/tag_group_records.rb

@@ -1,220 +0,0 @@
-require 'cgi'
-
-# SQL fixtures use the migration contract without inventing application models.
-# Include explicitly; these helpers must not affect unrelated examples.
-module TagGroupRecords
-  GROUP_TABLES = [
-      'tag_groups', 'tag_group_tags', 'tag_group_groups',
-      'tag_group_placements', 'tag_group_versions'].freeze
-  WRITE_TABLES = GROUP_TABLES + [
-      'wiki_pages', 'wiki_revisions', 'wiki_versions', 'wiki_lines',
-      'wiki_revision_lines', 'tag_names', 'tag_description_versions',
-      'tag_descriptions']
-
-  def group_connection = ApplicationRecord.connection
-
-  def group_rows table, conditions = { }
-    clauses = conditions.map do |column, value|
-      "#{ group_connection.quote_column_name(column) } = #{ group_connection.quote(value) }"
-    end
-    sql = "SELECT * FROM #{ group_connection.quote_table_name(table) }"
-    sql += " WHERE #{ clauses.join(' AND ') }" if clauses.any?
-    group_connection.select_all(sql).to_a.sort_by { |row| row.values.map(&:to_s) }
-  end
-
-  def insert_group_row table, attributes
-    columns = attributes.keys.map { group_connection.quote_column_name(_1) }.join(', ')
-    values = attributes.values.map { group_connection.quote(_1) }.join(', ')
-    group_connection.insert(
-        "INSERT INTO #{ group_connection.quote_table_name(table) } (#{ columns }) " +
-        "VALUES (#{ values })")
-  end
-
-  def group_state
-    WRITE_TABLES.to_h { |table| [table, group_rows(table)] }
-  end
-
-  def expect_noop_group_update group_id:, page:
-    before_state = group_state
-    group = TagGroup.find(group_id)
-    version_id = TagGroupVersion.find_by!(
-        tag_group_id: group_id, version_no: group.version_no).id
-    revision_id = page.reload.current_revision.id
-    wiki_version_id = page.wiki_versions.order(version_no: :desc).first.id
-    writes = []
-    tables = Regexp.union(WRITE_TABLES)
-    subscriber = lambda do |*args|
-      sql = args.last.fetch(:sql)
-      if sql.match?(/\A\s*(?:INSERT INTO|UPDATE|DELETE FROM)\s+`?(?:#{ tables })`?\s/i)
-        writes << sql
-      end
-    end
-
-    aggregate_failures 'no-op current state, history and SQL writes' do
-      ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') { yield }
-      expect(response).to have_http_status(:ok)
-      after_state = group_state
-      before_state.each do |table, rows|
-        expect(after_state.fetch(table)).to eq(rows), "No-op changed #{ table }"
-      end
-      expect(TagGroupVersion.find_by!(
-          tag_group_id: group_id, version_no: group.reload.version_no).id).to eq(version_id)
-      expect(page.reload.current_revision.id).to eq(revision_id)
-      expect(page.wiki_versions.order(version_no: :desc).first.id).to eq(wiki_version_id)
-      expect(writes).to be_empty
-    end
-  end
-
-  def expect_atomic_group_write table
-    before_state = group_state
-    failure = Class.new(StandardError)
-    injected = false
-    subscriber = lambda do |*args|
-      sql = args.last.fetch(:sql)
-      next unless sql.match?(/\A\s*(?:INSERT INTO|UPDATE)\s+`?#{ table }`?\s/i)
-
-      injected = true
-      raise failure, 'injected after SQL write'
-    end
-    begin
-      ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') { yield }
-    rescue failure
-      # Inspect the database after the operation's transaction unwinds.
-    end
-    aggregate_failures do
-      expect(injected).to be(true), "No INSERT/UPDATE reached #{ table }"
-      expect(group_state).to eq(before_state)
-    end
-  end
-
-  def group_version group_id, number
-    row = group_rows('tag_group_versions', tag_group_id: group_id, version_no: number).sole
-    row.merge('members' => JSON.parse(row.fetch('members')),
-              'placements' => JSON.parse(row.fetch('placements')))
-  end
-
-  def group_tag name
-    tag = create(:tag, primary_name: name)
-    TagVersioning.ensure_snapshot!(tag, created_by_user: user)
-    tag.reload
-  end
-
-  def legacy_group name, body
-    # Historical fixtures preserve blank lines independently of today's writer.
-    body = body.sub(/\n+\z/, '')
-    page = WikiPage.create!(
-        tag_name: create(:tag_name, name: "タググループ:#{ name }"),
-        body:, created_user: user, updated_user: user)
-    WikiVersionRecorder.record!(page:, event_type: :create, created_by_user: user)
-    lines = body.split("\n")
-    shas = lines.map { Digest::SHA256.hexdigest(_1) }
-    revision = WikiRevision.create!(
-        wiki_page: page, kind: :content, created_user: user, lines_count: lines.size,
-        tree_sha256: Digest::SHA256.hexdigest(shas.join(',')))
-    lines.each_with_index do |line, position|
-      sha = shas.fetch(position)
-      line_id = WikiLine.find_by(sha256: sha)&.id || insert_group_row('wiki_lines', {
-          body: line, sha256: sha, created_at: Time.current, updated_at: Time.current })
-      WikiRevisionLine.create!(wiki_revision: revision, wiki_line_id: line_id, position:)
-    end
-    page
-  end
-
-  def seed_group name:, placements: [], members: [], description: nil, id: nil
-    now = Time.current.change(usec: 0)
-    attributes = {
-        name:, description:, version_no: 1,
-        created_by_user_id: user.id, updated_by_user_id: user.id,
-        created_at: now, updated_at: now }
-    attributes[:id] = id if id
-    group_id = insert_group_row('tag_groups', attributes)
-    insert_group_row('tag_group_versions', {
-        tag_group_id: group_id, version_no: 1, event_type: 'create',
-        name:, description:, members: members.to_json, placements: placements.to_json,
-        created_by_user_id: user.id, created_at: now })
-    members.each do |member|
-      tag_member = member.key?('tag_id')
-      table = tag_member ? 'tag_group_tags' : 'tag_group_groups'
-      key = tag_member ? :tag_id : :child_tag_group_id
-      value = member.fetch(tag_member ? 'tag_id' : 'tag_group_id')
-      insert_group_row(table, {
-          tag_group_id: group_id, key => value,
-          created_by_user_id: user.id, created_at: now })
-    end
-    position = 0
-    append = lambda do |nodes, parent|
-      nodes.each do |node|
-        position += 1
-        own_position = position
-        insert_group_row('tag_group_placements', {
-            tag_group_id: group_id, position:, parent_position: parent,
-            section_name: node['section_name'], description: node['description'],
-            tag_id: node['tag_id'], child_tag_group_id: node['tag_group_id'],
-            created_by_user_id: user.id, updated_by_user_id: user.id,
-            created_at: now, updated_at: now })
-        append.call(node.fetch('children'), own_position)
-      end
-    end
-    append.call(placements, nil)
-    group_id
-  end
-
-  def without_group_legacy_reads
-    queries = []
-    subscriber = lambda do |*args|
-      sql = args.last.fetch(:sql)
-      if (sql.match?(/\bSELECT\b/i) &&
-          sql.match?(/\bwiki_(pages|revisions|versions|lines|revision_lines)\b/i))
-        queries << sql
-      end
-    end
-    ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') { yield }
-    expect(queries).to be_empty
-  end
-
-  def group_title_path name
-    "/wiki/title/#{ CGI.escapeURIComponent("タググループ:#{ name }") }"
-  end
-
-  def migrate_groups
-    require_relative '../../db/migrate/20261008010000_migrate_tag_groups_from_wiki_pages'
-    migration = MigrateTagGroupsFromWikiPages.new
-    @group_migration_messages = []
-    allow(migration).to receive(:say) do |message, *_args|
-      @group_migration_messages << message if message.start_with?('Wiki #', 'Tag Group')
-    end
-    migration.suppress_messages { migration.up }
-  end
-
-  def expect_group_snapshot group_id, number:, placements:, members:, description: nil
-    current = group_rows('tag_groups', id: group_id).sole
-    version = group_version(group_id, number)
-    expect(current).to include('version_no' => number, 'description' => description),
-                       @group_migration_messages&.join("\n")
-    expect(version).to include(
-        'name' => current.fetch('name'), 'description' => description,
-        'version_no' => number, 'placements' => placements)
-    expect(version.fetch('members')).to match_array(members)
-    expect(group_rows('tag_group_tags', tag_group_id: group_id).map { _1.fetch('tag_id') })
-        .to match_array(members.filter_map { _1['tag_id'] })
-    children = group_rows('tag_group_groups', tag_group_id: group_id)
-    expect(children.map { _1.fetch('child_tag_group_id') })
-        .to match_array(members.filter_map { _1['tag_group_id'] })
-
-    rows = group_rows('tag_group_placements', tag_group_id: group_id)
-    tree = lambda do |parent|
-      rows.select { _1['parent_position'] == parent }.sort_by { _1.fetch('position') }
-          .map do |row|
-        node = if row['tag_id']
-          { 'tag_id' => row.fetch('tag_id') }
-        elsif row['child_tag_group_id']
-          { 'tag_group_id' => row.fetch('child_tag_group_id') }
-        else
-          { 'section_name' => row.fetch('section_name'), 'description' => row['description'] }
-        end
-        node.merge('children' => tree.call(row.fetch('position')))
-      end
-    end
-    expect(tree.call(nil)).to eq(placements)
-  end
-end

backend/spec/support/wiki_records.rb

@@ -1,20 +0,0 @@
-# Historical records must remain seedable after application creation is frozen.
-module WikiRecords
-  def seed_wiki_page(tag_name:, body:, created_by_user:, message: nil)
-    page = WikiPage.create!(tag_name:, body:,
-                            created_user: created_by_user, updated_user: created_by_user)
-    revision = Wiki::Commit.legacy_content!(
-        page:, body:, created_user: created_by_user, message:)
-    if tag_name.tag && tag_name.language_code == 'ja'
-      TagDescription.create!(
-          id: page.id, tag: tag_name.tag, language_code: 'ja', body: page.reload.body,
-          version_no: 1, created_by_user_id: created_by_user.id,
-          updated_by_user_id: created_by_user.id)
-      TagDescriptionVersion.create!(
-          id: revision.id, tag_id: tag_name.tag_id, language_code: 'ja',
-          version_no: 1, event_type: 'create', body: page.body,
-          created_by_user_id: created_by_user.id, created_at: revision.created_at)
-    end
-    page
-  end
-end

backend/spec/tasks/nico_export_spec.rb

@@ -18,8 +18,8 @@ RSpec.describe 'nico:export' do
   before do
     task.reenable
 
-    allow(ENV).to receive(:fetch).with('NIZIKA_NICO_MYSQL_USER').and_return('mysql-user')
-    allow(ENV).to receive(:fetch).with('NIZIKA_NICO_MYSQL_PASS').and_return('mysql-pass')
+    allow(ENV).to receive(:fetch).with('MYSQL_USER').and_return('mysql-user')
+    allow(ENV).to receive(:fetch).with('MYSQL_PASS').and_return('mysql-pass')
     allow(ENV).to receive(:fetch).with('NIZIKA_NICO_PATH').and_return('/srv/nizika-nico')
   end
 
@@ -33,8 +33,8 @@ RSpec.describe 'nico:export' do
       expect(Open3).to receive(:capture3) do |env, *args, **kwargs|
         expect(env).to eq(
           {
-            'NIZIKA_NICO_MYSQL_USER' => 'mysql-user',
-            'NIZIKA_NICO_MYSQL_PASS' => 'mysql-pass',
+            'MYSQL_USER' => 'mysql-user',
+            'MYSQL_PASS' => 'mysql-pass',
           },
         )
 

frontend/.gitignore

@@ -22,5 +22,3 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
-
-/help

frontend/package-lock.json

@@ -38,7 +38,6 @@
         "remark-gfm": "^4.0.1",
         "tailwind-merge": "^3.3.0",
         "unist-util-visit-parents": "^6.0.1",
-        "yaml": "^2.9.1",
         "zustand": "^5.0.8"
       },
       "devDependencies": {
@@ -2061,6 +2060,9 @@
         "arm"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2075,6 +2077,9 @@
         "arm"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2089,6 +2094,9 @@
         "arm64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2103,6 +2111,9 @@
         "arm64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2117,6 +2128,9 @@
         "loong64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2131,6 +2145,9 @@
         "loong64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2145,6 +2162,9 @@
         "ppc64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2159,6 +2179,9 @@
         "ppc64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2173,6 +2196,9 @@
         "riscv64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2187,6 +2213,9 @@
         "riscv64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2201,6 +2230,9 @@
         "s390x"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2215,6 +2247,9 @@
         "x64"
       ],
       "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -2229,6 +2264,9 @@
         "x64"
       ],
       "dev": true,
+      "libc": [
+        "musl"
+      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -9076,9 +9114,10 @@
       "license": "ISC"
     },
     "node_modules/yaml": {
-      "version": "2.9.1",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.1.tgz",
-      "integrity": "sha512-3NxN8+78OdzbT7C/WjGsyfPAtJaN3FNDsWxv7Y7mcDsT/oOmgW8BpyQQFFBnvZE3j9Y2Sdz1ULFLezL7Eb2yFw==",
+      "version": "2.8.3",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.3.tgz",
+      "integrity": "sha512-AvbaCLOO2Otw/lW5bmh9d/WEdcDFdQp2Z2ZUH3pX9U2ihyUY0nvLv7J6TrWowklRGPYbB/IuIMfYgxaCPg5Bpg==",
+      "dev": true,
       "license": "ISC",
       "bin": {
         "yaml": "bin.mjs"

frontend/package.json

@@ -42,7 +42,6 @@
     "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.3.0",
     "unist-util-visit-parents": "^6.0.1",
-    "yaml": "^2.9.1",
     "zustand": "^5.0.8"
   },
   "devDependencies": {

frontend/scripts/help-assets.test.ts

@@ -1,112 +0,0 @@
-import { mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises'
-import { tmpdir } from 'node:os'
-import path from 'node:path'
-import { afterAll, afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { generateHelpAssets } from './help-assets'
-
-import type { ArticleMeta, HelpChange, HelpSearchEntry, HelpTitleIndex } from '@/lib/help'
-
-vi.hoisted (() => {
-  vi.stubGlobal ('Uint8Array', Object.getPrototypeOf (new TextEncoder ().encode ('')).constructor)
-})
-afterAll (() => vi.unstubAllGlobals ())
-
-
-const readAsset = <T,> (modules: Map<string, string>, name: string): T => {
-  const source = modules.get (`virtual:help/${ name }`)!
-  const argument = source.slice ('export default JSON.parse('.length, -1)
-  return JSON.parse (JSON.parse (argument))
-}
-
-
-describe ('Build-time Help assets', () => {
-  let root: string
-
-  beforeEach (async () => {
-    root = await mkdtemp (path.join (tmpdir (), 'btrc-help-assets-'))
-  })
-
-  afterEach (async () => {
-    await rm (root, { recursive: true, force: true })
-  })
-
-  const writeArticle = async (
-      identifier: string,
-      editions: Record<string, string>,
-      current = '2026-10-02.10',
-  ) => {
-    const articleRoot = path.join (root, identifier)
-    const editionRoot = path.join (articleRoot, 'editions', 'ja')
-    await mkdir (editionRoot, { recursive: true })
-    await writeFile (path.join (articleRoot, 'article.yml'), [
-	`identifier: ${ identifier }`, 'canonical_language: ja', 'title: stale YAML title',
-	'languages:', '  ja:', `    current_edition: ${ current }`].join ('\n'))
-    await Promise.all (Object.entries (editions).map (([edition, source]) =>
-	writeFile (path.join (editionRoot, `${ edition }.mdx`), source)))
-  }
-
-  it ('generates current search and ordered published history from each edition H1', async () => {
-    await writeArticle ('guide', {
-	'2026-10-01': '# 旧ホーム\n\n過去本文',
-	'2026-10-02': '# ホーム\n\n最初の同日版',
-	'2026-10-02.2': '# ホーム\n\n第二版',
-	'2026-10-02.3': '# ホーム\n\n第三版',
-	'2026-10-02.10': '\uFEFF# 最新ホーム\r\n\r\n現在本文\r\n# 別見出し',
-	'2026-10-02.11': '# 未公開\n\n検索に含めない' })
-    const { modules } = await generateHelpAssets (root)
-    const articles = readAsset<Record<string, ArticleMeta>> (modules, 'articles')
-    expect (articles.guide.languages.ja).toEqual ({
-	currentEdition: '2026-10-02.10', publishedEditions: [
-	    '2026-10-01', '2026-10-02', '2026-10-02.2', '2026-10-02.3', '2026-10-02.10'] })
-    expect (readAsset<Record<string, HelpSearchEntry[]>> (modules, 'search').ja).toEqual ([{
-	identifier: 'guide', edition: '2026-10-02.10', title: '最新ホーム',
-	body: '\r\n現在本文\r\n# 別見出し' }])
-    const changes = readAsset<Record<string, HelpChange[]>> (modules, 'changes').ja
-    expect (changes.map (row => [row.edition, row.title, row.pred, row.change, row.date]))
-	.toEqual ([
-	    ['2026-10-02.10', '最新ホーム', '2026-10-02.3', 'update', '2026-10-02'],
-	    ['2026-10-02.3', 'ホーム', '2026-10-02.2', 'update', '2026-10-02'],
-	    ['2026-10-02.2', 'ホーム', '2026-10-02', 'update', '2026-10-02'],
-	    ['2026-10-02', 'ホーム', '2026-10-01', 'update', '2026-10-02'],
-	    ['2026-10-01', '旧ホーム', null, 'new', '2026-10-01']])
-    const titles = readAsset<Record<string, HelpTitleIndex>> (modules, 'titles').ja
-    expect (titles).toEqual ({ '旧ホーム': ['guide'], 'ホーム': ['guide'],
-	'最新ホーム': ['guide'] })
-    expect (modules.get ('virtual:help/loaders')).not.toContain ('2026-10-02.11')
-    expect (modules.get ('virtual:help/loaders')).toContain ('2026-10-02.10.mdx?raw')
-    expect (modules.get ('virtual:help/search')).not.toContain ('import(')
-  })
-
-  it ('retains ambiguous title identifiers and normalises width and case', async () => {
-    await writeArticle ('alpha', { '2026-10-02': '# ＨＯＭＥ\n本文' }, '2026-10-02')
-    await writeArticle ('beta', { '2026-10-02': '# Home\n本文' }, '2026-10-02')
-    const { modules } = await generateHelpAssets (root)
-    expect (readAsset<Record<string, HelpTitleIndex>> (modules, 'titles').ja.home)
-	.toEqual (['alpha', 'beta'])
-    expect (readAsset<Record<string, HelpChange[]>> (modules, 'changes').ja
-	.map (row => row.identifier)).toEqual (['alpha', 'beta'])
-  })
-
-  it ('rejects missing current files during generation', async () => {
-    await writeArticle ('guide', { '2026-10-02': '# ホーム' })
-    await expect (generateHelpAssets (root)).rejects.toThrow ('Missing current Help edition')
-  })
-
-  it.each (['本文\n# 遅い見出し', '#   \n本文']) (
-      'rejects missing leading H1 at build time: %s', async source => {
-	await writeArticle ('guide', { '2026-10-02.10': source })
-	await expect (generateHelpAssets (root)).rejects.toThrow ('Missing leading Help H1')
-      })
-
-  it ('rejects absent canonical metadata instead of generating incomplete assets', async () => {
-    await writeArticle ('guide', { '2026-10-02.10': '# ホーム' })
-    await writeFile (path.join (root, 'guide', 'article.yml'),
-	'identifier: guide\nlanguages:\n  ja:\n    current_edition: 2026-10-02.10')
-    await expect (generateHelpAssets (root)).rejects.toThrow ('Invalid Help metadata')
-  })
-
-  it ('rejects an empty Help checkout', async () => {
-    await expect (generateHelpAssets (root)).rejects.toThrow ('No Help articles found')
-  })
-})

frontend/scripts/help-assets.ts

@@ -1,192 +0,0 @@
-import { readFile, readdir } from 'node:fs/promises'
-import path from 'node:path'
-import { normalizePath as normalisePath } from 'vite'
-import { parse as parseYAML } from 'yaml'
-
-import type { Plugin } from 'vite'
-
-type Language = { currentEdition: string; publishedEditions: string[] }
-type Article = {
-    identifier: string
-    canonicalLanguage: string
-    languages: Record<string, Language> }
-type Text = { title: string; body: string }
-type SearchEntry = Text & { identifier: string; edition: string }
-type Change = {
-    identifier: string
-    edition: string
-    title: string
-    pred: string | null
-    change: 'new' | 'update'
-    date: string }
-type RawArticle = {
-    identifier: string
-    canonical_language: string
-    languages: Record<string, { current_edition: string }> }
-
-const prefix = 'virtual:help/'
-
-
-const compareEditions = (a: string, b: string): number => {
-  const [dateA, revisionA = '1'] = a.split ('.')
-  const [dateB, revisionB = '1'] = b.split ('.')
-  return dateA.localeCompare (dateB) || Number (revisionA) - Number (revisionB)
-}
-
-
-const validateEdition = (edition: string): void => {
-  const [date, revision = '1'] = edition.split ('.')
-  if (!(/^\d{4}-\d{2}-\d{2}(?:\.[1-9]\d*)?$/.test (edition))
-      || new Date (date).toISOString ().slice (0, 10) !== date
-      || !(Number.isSafeInteger (Number (revision))))
-    throw new Error (`Invalid Help edition: ${ edition }`)
-}
-
-
-export const generateHelpAssets = async (
-    root: string,
-): Promise<{ modules: Map<string, string>; files: string[] }> => {
-  const modules = new Map<string, string> ()
-  const files: string[] = [root]
-  const articles: Record<string, Article> = Object.create (null)
-  const search: Record<string, SearchEntry[]> = Object.create (null)
-  const changes: Record<string, Change[]> = Object.create (null)
-  const titles: Record<string, Record<string, string[]>> = Object.create (null)
-  const components: string[] = []
-  const sources: string[] = []
-  const texts: string[] = []
-  const directories = (await readdir (root, { withFileTypes: true }))
-      .filter (entry => entry.isDirectory () && !(entry.name.startsWith ('.')))
-      .sort ((a, b) => a.name.localeCompare (b.name))
-
-  for (const directory of directories)
-  {
-    const articlePath = path.join (root, directory.name, 'article.yml')
-    files.push (articlePath)
-    const raw = parseYAML (await readFile (articlePath, 'utf8')) as RawArticle | null
-    if (raw == null || raw.identifier !== directory.name
-	|| typeof raw.canonical_language !== 'string'
-	|| raw.languages == null || typeof raw.languages !== 'object'
-	|| !(Object.hasOwn (raw.languages, raw.canonical_language)))
-      throw new Error (`Invalid Help metadata: ${ articlePath }`)
-
-    const article: Article = {
-	identifier: raw.identifier,
-	canonicalLanguage: raw.canonical_language,
-	languages: Object.create (null) }
-    articles[raw.identifier] = article
-
-    for (const [language, metadata] of Object.entries (raw.languages))
-    {
-      if (!(/^[a-zA-Z0-9-]+$/.test (language))
-	  || typeof metadata?.current_edition !== 'string')
-	throw new Error (`Invalid Help language: ${ articlePath }/${ language }`)
-
-      const currentEdition = metadata.current_edition
-      validateEdition (currentEdition)
-      const editionRoot = path.join (root, directory.name, 'editions', language)
-      files.push (editionRoot)
-      const editions = (await readdir (editionRoot)).filter (name => name.endsWith ('.mdx'))
-	  .map (name => name.slice (0, -4))
-      editions.forEach (validateEdition)
-      if (!(editions.includes (currentEdition)))
-	throw new Error (`Missing current Help edition: ${ editionRoot }/${ currentEdition }`)
-
-      const publishedEditions = editions
-	  .filter (edition => compareEditions (edition, currentEdition) <= 0)
-	  .sort (compareEditions)
-      article.languages[language] = { currentEdition, publishedEditions }
-      search[language] ??= []
-      changes[language] ??= []
-      titles[language] ??= Object.create (null)
-
-      for (const [index, edition] of publishedEditions.entries ())
-      {
-	const sourcePath = path.join (editionRoot, `${ edition }.mdx`)
-	files.push (sourcePath)
-	const mdx = (await readFile (sourcePath, 'utf8')).replace (/^\uFEFF/, '')
-	const heading = mdx.match (/^# +([^\r\n]+)(?:\r?\n|$)/)
-	if (heading == null || !(heading[1].trim ()))
-	  throw new Error (`Missing leading Help H1: ${ sourcePath }`)
-
-	const text = { title: heading[1].trim (), body: mdx.slice (heading[0].length) }
-	const key = JSON.stringify (`${ raw.identifier }/${ language }/${ edition }`)
-	const textId = `${ prefix }text/${ raw.identifier }/${ language }/${ edition }`
-	const componentId = JSON.stringify (normalisePath (sourcePath))
-	const sourceId = JSON.stringify (normalisePath (sourcePath) + '?raw')
-	modules.set (textId, `export default ${ JSON.stringify (text) }`)
-	texts.push (`${ key }: () => import(${ JSON.stringify (textId) })`)
-	components.push (`${ key }: () => import(${ componentId })`)
-	sources.push (`${ key }: () => import(${ sourceId })`)
-
-	if (edition === currentEdition)
-	  search[language].push ({ identifier: raw.identifier, edition, ...text })
-	changes[language].push ({ identifier: raw.identifier, edition, title: text.title,
-	    pred: publishedEditions[index - 1] ?? null,
-	    change: index === 0 ? 'new' : 'update', date: edition.split ('.')[0] })
-	const title = text.title.trim ().normalize ('NFKC').toLowerCase ()
-	const identifiers = titles[language][title] ??= []
-	if (!(identifiers.includes (raw.identifier)))
-	  identifiers.push (raw.identifier)
-      }
-    }
-  }
-
-  if (Object.keys (articles).length === 0)
-    throw new Error (`No Help articles found: ${ root }`)
-
-  Object.values (changes).forEach (rows => rows.sort ((a, b) =>
-      compareEditions (b.edition, a.edition) || a.identifier.localeCompare (b.identifier)))
-  for (const [name, data] of Object.entries ({ articles, search, changes, titles }))
-  {
-    modules.set (`${ prefix }${ name }`,
-	`export default JSON.parse(${ JSON.stringify (JSON.stringify (data)) })`)
-  }
-  modules.set (`${ prefix }loaders`, [
-      `export const components = { ${ components.join (',\n') } };`,
-      `export const sources = { ${ sources.join (',\n') } };`,
-      `export const texts = { ${ texts.join (',\n') } };`].join ('\n'))
-  return { modules, files }
-}
-
-
-export const helpAssets = (): Plugin => {
-  const state: { root: string; data?: ReturnType<typeof generateHelpAssets> } = { root: '' }
-  const data = () => state.data ??= generateHelpAssets (state.root)
-
-  return {
-      name: 'help-assets',
-      configResolved (config) {
-	state.root = path.resolve (config.root, 'help')
-      },
-      async buildStart () {
-	state.data = generateHelpAssets (state.root)
-	const generated = await data ()
-	generated.files.forEach (file => this.addWatchFile (file))
-      },
-      resolveId (id) {
-	return id.startsWith (prefix) ? `\0${ id }` : null
-      },
-      async load (id) {
-	if (!(id.startsWith (`\0${ prefix }`)))
-	  return null
-	const source = (await data ()).modules.get (id.slice (1))
-	if (source == null)
-	  throw new Error (`Unknown Help asset: ${ id.slice (1) }`)
-	return source
-      },
-      configureServer (server) {
-	server.watcher.add (state.root)
-	server.watcher.on ('all', (_event, file) => {
-	  if (!(file.startsWith (state.root + path.sep)) || !(/\.(mdx|yml)$/.test (file)))
-	    return
-	  state.data = undefined
-	  for (const module of server.moduleGraph.idToModuleMap.values ())
-	  {
-	    if (module.id?.startsWith (`\0${ prefix }`))
-	      server.moduleGraph.invalidateModule (module)
-	  }
-	  server.ws.send ({ type: 'full-reload' })
-	})
-      } }
-}

frontend/src/App.tsx

@@ -15,6 +15,7 @@ import { Toaster } from '@/components/ui/toaster'
 import { apiPost, isApiError } from '@/lib/api'
 import { applyClientAnimationMode,
 	 applyClientAppearance,
+	 type ClientAnimationMode,
 	 fetchUserThemeSlots,
 	 fetchUserSettings,
 	 getClientThemeMode,
@@ -24,6 +25,7 @@ import { applyClientAnimationMode,
 	 seedClientThemeMode } from '@/lib/settings'
 import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 import { UnsavedChangesGuardProvider } from '@/lib/useUnsavedChangesGuard'
+
 import { KeyboardShortcutsProvider } from '@/lib/useKeyboardShortcuts'
 import DeerjikistDetailPage from '@/pages/deerjikists/DeerjikistDetailPage'
 import MaterialBasePage from '@/pages/materials/MaterialBasePage'
@@ -32,15 +34,12 @@ import MaterialHistoryPage from '@/pages/materials/MaterialHistoryPage'
 import MaterialListPage from '@/pages/materials/MaterialListPage'
 import MaterialNewPage from '@/pages/materials/MaterialNewPage'
 import MaterialSyncSuppressionsPage from '@/pages/materials/MaterialSyncSuppressionsPage'
+// import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 import MorePage from '@/pages/MorePage'
 import GekanatorPage from '@/pages/GekanatorPage'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import TOSPage from '@/pages/TOSPage.mdx'
-import HelpDetailPage from '@/pages/help/HelpDetailPage'
-import HelpChangesPage from '@/pages/help/HelpChangesPage'
-import HelpDiffPage from '@/pages/help/HelpDiffPage'
-import HelpListPage from '@/pages/help/HelpListPage'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
 import PostHistoryPage from '@/pages/posts/PostHistoryPage'
 import PostNewPage from '@/pages/posts/PostNewPage'
@@ -61,62 +60,90 @@ import WikiSearchPage from '@/pages/wiki/WikiSearchPage'
 
 import type { Dispatch, FC, SetStateAction } from 'react'
 
-import type { ClientAnimationMode } from '@/lib/settings'
 import type { User } from '@/types'
 
 
 const RouteTransitionWrapper = ({ animationMode, user, setUser }: {
-    animationMode:  ClientAnimationMode
-    user:           User | null
-    setUser:        Dispatch<SetStateAction<User | null>> }) => {
+    animationMode: ClientAnimationMode
+    user:     User | null
+    setUser:  Dispatch<SetStateAction<User | null>> }) => {
   const location = useLocation ()
 
-  const routes = (
-      <Routes location={location}>
-	<Route path="/" element={<Navigate to="/posts" replace/>}/>
-	<Route path="/posts" element={<PostListPage/>}/>
-	<Route path="/posts/new" element={<PostNewPage user={user}/>}/>
-	<Route path="/posts/search" element={<PostSearchPage/>}/>
-	<Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
-	<Route path="/posts/changes" element={<PostHistoryPage/>}/>
-	<Route path="/tags" element={<TagListPage/>}/>
-	<Route path="/tags/:id" element={<TagDetailPage/>}/>
-	<Route path="/tags/:id/deerjikists" element={<DeerjikistDetailPage/>}/>
-	<Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
-	<Route path="/nico/tags" element={<NicoTagListPage user={user}/>}/>
-	<Route path="/tags/changes" element={<TagHistoryPage/>}/>
-	<Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
-	<Route path="/materials" element={<MaterialBasePage/>}>
-	  <Route index element={<MaterialListPage/>}/>
-	  <Route path="changes" element={<MaterialHistoryPage/>}/>
-	  <Route path="new" element={<MaterialNewPage/>}/>
-	  <Route path="suppressions" element={<MaterialSyncSuppressionsPage/>}/>
-	  <Route path=":id" element ={<MaterialDetailPage/>}/>
-	</Route>
-	<Route path="/wiki" element={<WikiSearchPage/>}/>
-	<Route path="/wiki/:title" element={<WikiDetailPage/>}/>
-	<Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>
-	<Route path="/wiki/:id/edit" element={<WikiEditPage user={user}/>}/>
-	<Route path="/wiki/:id/diff" element={<WikiDiffPage/>}/>
-	<Route path="/wiki/changes" element={<WikiHistoryPage/>}/>
-	<Route path="/help" element={<HelpListPage/>}/>
-	<Route path="/help/changes" element={<HelpChangesPage/>}/>
-	<Route path="/help/:identifier/diff" element={<HelpDiffPage/>}/>
-	<Route path="/help/:identifier" element={<HelpDetailPage/>}/>
-	<Route path="/users/settings" element={<SettingPage user={user} setUser={setUser}/>}/>
-	<Route path="/settings" element={<Navigate to="/users/settings" replace/>}/>
-	<Route path="/tos" element={<TOSPage/>}/>
-	<Route path="/gekanator" element={<GekanatorPage user={user}/>}/>
-	<Route path="/more" element={<MorePage/>}/>
-	<Route path="*" element={<NotFound/>}/>
-      </Routes>)
-
   if (animationMode === 'off')
-    return routes
+    {
+      return (
+	  <Routes location={location}>
+	    <Route path="/" element={<Navigate to="/posts" replace/>}/>
+	    <Route path="/posts" element={<PostListPage/>}/>
+	    <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
+	    <Route path="/posts/search" element={<PostSearchPage/>}/>
+	    <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
+	    <Route path="/posts/changes" element={<PostHistoryPage/>}/>
+	    <Route path="/tags" element={<TagListPage/>}/>
+	    <Route path="/tags/:id" element={<TagDetailPage/>}/>
+	    <Route path="/tags/:id/deerjikists" element={<DeerjikistDetailPage/>}/>
+	    <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
+	    <Route path="/nico/tags" element={<NicoTagListPage user={user}/>}/>
+	    <Route path="/tags/changes" element={<TagHistoryPage/>}/>
+	    <Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
+	    <Route path="/materials" element={<MaterialBasePage/>}>
+	      <Route index element={<MaterialListPage/>}/>
+	      <Route path="changes" element={<MaterialHistoryPage/>}/>
+	      <Route path="new" element={<MaterialNewPage/>}/>
+	      <Route path="suppressions" element={<MaterialSyncSuppressionsPage/>}/>
+	      <Route path=":id" element ={<MaterialDetailPage/>}/>
+	    </Route>
+	    <Route path="/wiki" element={<WikiSearchPage/>}/>
+	    <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
+	    <Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>
+	    <Route path="/wiki/:id/edit" element={<WikiEditPage user={user}/>}/>
+	    <Route path="/wiki/:id/diff" element={<WikiDiffPage/>}/>
+	    <Route path="/wiki/changes" element={<WikiHistoryPage/>}/>
+	    <Route path="/users/settings" element={<SettingPage user={user} setUser={setUser}/>}/>
+	    <Route path="/settings" element={<Navigate to="/users/settings" replace/>}/>
+	    <Route path="/tos" element={<TOSPage/>}/>
+	    <Route path="/gekanator" element={<GekanatorPage user={user}/>}/>
+	    <Route path="/more" element={<MorePage/>}/>
+	    <Route path="*" element={<NotFound/>}/>
+	  </Routes>)
+    }
 
   return (
       <AnimatePresence mode="wait">
-	{routes}
+	<Routes location={location}>
+	  <Route path="/" element={<Navigate to="/posts" replace/>}/>
+	  <Route path="/posts" element={<PostListPage/>}/>
+	  <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
+	  <Route path="/posts/search" element={<PostSearchPage/>}/>
+	  <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
+	  <Route path="/posts/changes" element={<PostHistoryPage/>}/>
+	  <Route path="/tags" element={<TagListPage/>}/>
+	  <Route path="/tags/:id" element={<TagDetailPage/>}/>
+	  <Route path="/tags/:id/deerjikists" element={<DeerjikistDetailPage/>}/>
+	  <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
+	  <Route path="/nico/tags" element={<NicoTagListPage user={user}/>}/>
+	  <Route path="/tags/changes" element={<TagHistoryPage/>}/>
+	  <Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
+	  <Route path="/materials" element={<MaterialBasePage/>}>
+	    <Route index element={<MaterialListPage/>}/>
+	    <Route path="changes" element={<MaterialHistoryPage/>}/>
+	    <Route path="new" element={<MaterialNewPage/>}/>
+	    <Route path="suppressions" element={<MaterialSyncSuppressionsPage/>}/>
+	    <Route path=":id" element ={<MaterialDetailPage/>}/>
+	  </Route>
+	  <Route path="/wiki" element={<WikiSearchPage/>}/>
+	  <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
+	  <Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>
+	  <Route path="/wiki/:id/edit" element={<WikiEditPage user={user}/>}/>
+	  <Route path="/wiki/:id/diff" element={<WikiDiffPage/>}/>
+	  <Route path="/wiki/changes" element={<WikiHistoryPage/>}/>
+	  <Route path="/users/settings" element={<SettingPage user={user} setUser={setUser}/>}/>
+	  <Route path="/settings" element={<Navigate to="/users/settings" replace/>}/>
+	  <Route path="/tos" element={<TOSPage/>}/>
+	  <Route path="/gekanator" element={<GekanatorPage user={user}/>}/>
+	  <Route path="/more" element={<MorePage/>}/>
+	  <Route path="*" element={<NotFound/>}/>
+	</Routes>
       </AnimatePresence>)
 }
 
@@ -139,9 +166,9 @@ const RoutedApp: FC = () => {
       () => (
 	  animationMode === 'off'
 	  ? { duration: 0 }
-	  : (animationMode === 'reduced'
-	     ? { duration: .08, ease: 'linear' as const }
-	     : { duration: .2, ease: 'easeOut' as const })
+	  : animationMode === 'reduced'
+	    ? { duration: .08, ease: 'linear' as const }
+	    : { duration: .2, ease: 'easeOut' as const }
       ),
       [animationMode],
   )
@@ -258,12 +285,10 @@ const RoutedApp: FC = () => {
       </DialogueProvider>)
 }
 
-
 const router = createBrowserRouter ([{
     path: '*',
     element: <RoutedApp/> }])
 
-
 const App: FC = () => (
     <>
       <RouteBlockerOverlay/>
@@ -271,5 +296,4 @@ const App: FC = () => (
       <RouterProvider router={router}/>
     </>)
 
-
 export default App

frontend/src/components/TopNav.tsx

@@ -20,7 +20,6 @@ import type { FC, MouseEvent } from 'react'
 import type { Material, Menu, MenuVisibleItem, Tag, User } from '@/types'
 
 type Props = { user: User | null }
-type NavDensity = 'auto' | 'comfortable' | 'compact'
 
 
 export const menuOutline = (
@@ -41,9 +40,6 @@ export const menuOutline = (
 
   const materialFlg = /^\/materials\/\d+/.test (pathName)
 
-  const helpVsbl = /\/help\/((?!changes)[^\/?]+)/.test (pathName)
-  const helpIdentifier = pathName.split ('/')[2] ?? ''
-
   return [
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },
@@ -75,7 +71,7 @@ export const menuOutline = (
 	    visible: materialFlg && Boolean (material?.tag) },
 	  { name: '履歴', to: `/materials/changes?material_id=${ material?.id }`,
 	    visible: materialFlg }] },
-      { name: 'Wiki', to: '/wiki', subMenu: [
+      { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
 	  { name: '検索', to: '/wiki' },
 	  { name: '新規', to: '/wiki/new', visible: editable },
 	  { name: '全体履歴', to: '/wiki/changes' },
@@ -86,13 +82,6 @@ export const menuOutline = (
 	  { name: '履歴', to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
 	  { name: '編輯', to: `/wiki/${ wikiId || wikiTitle }/edit`,
 	    visible: wikiPageFlg && editable }] },
-      { name: 'ヘルプ', to: '/help/home', base: '/help', subMenu: [
-	  { name: '検索', to: '/help' },
-	  { name: '全体履歴', to: '/help/changes' },
-	  { component: <Separator/>, visible: helpVsbl },
-	  { name: '履歴',
-	    to: `/help/changes?identifier=${ helpIdentifier }`,
-	    visible: helpVsbl }] },
       { name: 'おたのしみ', visible: false, subMenu: [
 	  { name: '上映会 (β)', to: '/theatres/1' },
 	  { name: 'グカネータ (β)', to: '/gekanator' }] },
@@ -115,8 +104,6 @@ const TopNav: FC<Props> = ({ user }) => {
   const dirRef = useRef<(-1) | 1> (1)
   const itemsRef = useRef<(HTMLAnchorElement | null)[]> ([])
   const navRef = useRef<HTMLDivElement | null> (null)
-  const layoutRef = useRef<HTMLDivElement | null> (null)
-  const barRef = useRef<HTMLElement | null> (null)
 
   const measure = (idx: number) => {
     const nav = navRef.current
@@ -141,8 +128,6 @@ const TopNav: FC<Props> = ({ user }) => {
       width:    0,
       visible:  false })
   const [menuOpen, setMenuOpen] = useState (false)
-  const [desktop, setDesktop] = useState (false)
-  const [density, setDensity] = useState<NavDensity> ('auto')
   const [moreVsbl, setMoreVsbl] = useState (false)
   const [openItemIdx, setOpenItemIdx] = useState (-1)
   const [wikiId, setWikiId] = useState<number | null> (WikiIdBus.get ())
@@ -209,81 +194,15 @@ const TopNav: FC<Props> = ({ user }) => {
   const dir = dirRef.current
 
   useLayoutEffect (() => {
-    const layout = layoutRef.current
-    const bar = barRef.current
-    const primary = bar?.querySelector<HTMLElement> ('.top-nav-primary')
-    if (layout == null || bar == null || primary == null)
-      return
-
-    const userLink = bar.querySelector<HTMLElement> ('.top-nav-user-desktop')
-    let raf = 0
-    let active = true
-
-    const update = () => {
-      if (!(window.matchMedia ('(min-width: 768px)').matches))
-      {
-	setDesktop (false)
-	setDensity ('auto')
-	return
-      }
-
-      // Measure the same desktop elements while the mobile layout is active.
-      layout.setAttribute ('data-measuring', '')
-      const previousDensity = layout.getAttribute ('data-density') ?? 'auto'
-      const fittingDensity = (() => {
-	try
-	{
-	  for (const candidate of ['auto', 'comfortable', 'compact'] as const)
-	  {
-	    layout.setAttribute ('data-density', candidate)
-	    const style = getComputedStyle (bar)
-	    const required = primary.getBoundingClientRect ().width
-		+ (userLink?.getBoundingClientRect ().width ?? 0)
-		+ parseFloat (style.paddingLeft) + parseFloat (style.paddingRight)
-		+ (userLink == null ? 0 : parseFloat (style.columnGap))
-	    if (required <= bar.clientWidth)
-	      return candidate
-	  }
-	  return null
-	}
-	finally
-	{
-	  layout.setAttribute ('data-density', previousDensity)
-	  layout.removeAttribute ('data-measuring')
-	}
-      }) ()
-      setDensity (fittingDensity ?? 'compact')
-      setDesktop (fittingDensity != null)
-      if (fittingDensity != null)
-	measure (moreVsbl ? -1 : activeIdx)
-    }
-
-    const schedule = () => {
-      if (!(active))
-	return
-      cancelAnimationFrame (raf)
-      raf = requestAnimationFrame (update)
-    }
-
-    const observer =
-	typeof ResizeObserver === 'undefined' ? null : new ResizeObserver (schedule)
-    observer?.observe (bar)
-    observer?.observe (primary)
-    if (userLink != null)
-      observer?.observe (userLink)
-    update ()
-    addEventListener ('resize', schedule)
-    document.fonts?.addEventListener ('loadingdone', schedule)
-    void document.fonts?.ready.then (schedule)
+    const raf = requestAnimationFrame (() => measure (moreVsbl ? -1 : activeIdx))
+    const onResize = () => requestAnimationFrame (() => measure (moreVsbl ? -1 : activeIdx))
 
+    addEventListener ('resize', onResize)
     return () => {
-      active = false
       cancelAnimationFrame (raf)
-      observer?.disconnect ()
-      removeEventListener ('resize', schedule)
-      document.fonts?.removeEventListener ('loadingdone', schedule)
+      removeEventListener ('resize', onResize)
     }
-  }, [activeIdx, moreVsbl, desktop, density, user?.name])
+  })
 
   useEffect (() => {
     const unsubscribe = WikiIdBus.subscribe (setWikiId)
@@ -296,22 +215,19 @@ const TopNav: FC<Props> = ({ user }) => {
   }, [activeIdx, location])
 
   return (
-      <div ref={layoutRef} className="top-nav-layout w-full min-w-0 shrink-0"
-	  data-desktop={desktop} data-density={density}>
-	<nav ref={barRef}
-	    className="top-nav-root top-nav-bar flex justify-between items-center w-full">
-	  <div className="top-nav-primary flex shrink-0 items-center h-12">
+      <>
+	<nav className="top-nav-root px-3 flex justify-between items-center w-full">
+	  <div className="flex items-center gap-2 h-12">
 	    <PrefetchLink
 		to="/posts"
-		className="top-nav-brand-link shrink-0 whitespace-nowrap font-bold"
+		className="top-nav-brand-link mx-4 text-xl font-bold"
 		onClick={() => {
 		  scroll (0, 0)
 		}}>
 	      ぼざクリ タグ広場
 	    </PrefetchLink>
 
-	    <div ref={navRef}
-		className="top-nav-desktop-menu relative shrink-0 h-12 items-center">
+	    <div ref={navRef} className="relative hidden md:flex h-12 items-center">
 	      <div aria-hidden
 		   className={cn ('absolute inset-y-0 h-12',
 				  'top-nav-highlight',
@@ -323,7 +239,6 @@ const TopNav: FC<Props> = ({ user }) => {
 	      {visibleMenu.map ((item, i) => (
 		  <motion.div
 		      key={item.to}
-		      className="shrink-0 whitespace-nowrap"
 		      {...(animationsOff
 			   ? { }
 			   : { layoutId: `menu-${ item.name }` })}
@@ -337,7 +252,7 @@ const TopNav: FC<Props> = ({ user }) => {
 			ref={(el: (HTMLAnchorElement | null)) => {
 			  itemsRef.current[i] = el
 			}}
-			className={cn ('top-nav-menu-link relative z-10 flex h-full items-center',
+			className={cn ('top-nav-menu-link relative z-10 flex h-full items-center px-5',
 				       (i === openItemIdx) && 'font-bold')}>
 		      {item.name}
 		    </PrefetchLink>
@@ -352,8 +267,7 @@ const TopNav: FC<Props> = ({ user }) => {
 		    setMoreVsbl (true)
 		    measure (-1)
 		  }}
-		  className={cn ('top-nav-menu-link relative z-10 flex h-full items-center',
-				 'shrink-0 whitespace-nowrap',
+		  className={cn ('top-nav-menu-link relative z-10 flex h-full items-center px-5',
 				 (openItemIdx < 0 || moreVsbl) && 'font-bold')}>
 		その他 &raquo;
 	      </PrefetchLink>
@@ -364,8 +278,7 @@ const TopNav: FC<Props> = ({ user }) => {
 
 	  <button
 	     type="button"
-	     className="top-nav-mobile-toggle shrink-0 whitespace-nowrap
-			ml-auto border-0 bg-transparent pr-4"
+	     className="top-nav-mobile-toggle md:hidden ml-auto border-0 bg-transparent pr-4"
 	     onClick={() => {
 	       setMenuOpen (!(menuOpen))
 	     }}>
@@ -378,8 +291,7 @@ const TopNav: FC<Props> = ({ user }) => {
 	      key="submenu-shell"
 	      {...(animationsOff ? { }
 		   : { layout: true })}
-	      className="top-nav-desktop-submenu relative z-20 shrink-0
-			 overflow-hidden top-nav-submenu"
+	      className="relative z-20 hidden md:block overflow-hidden top-nav-submenu"
 	      animate={{ height: submenuHeight }}
 	      onMouseLeave={() => {
 		if (moreVsbl)
@@ -393,8 +305,7 @@ const TopNav: FC<Props> = ({ user }) => {
 	   ? (
 	      moreMenu.map ((item, i) => (
 		  <div key={i} className="relative h-[40px]">
-		    <div className="absolute inset-0 flex items-center px-3
-				    overflow-x-auto whitespace-nowrap">
+		    <div className="absolute inset-0 flex items-center px-3">
 		      <motion.div
 			  transition={topNavTransition}
 			  {...(animationsOff
@@ -404,7 +315,7 @@ const TopNav: FC<Props> = ({ user }) => {
 			       : { initial: { x: 40, y: -40, opacity: 0 },
 				   animate: { x: 0, y: 0, opacity: 1 },
 				   exit: { x: 40, y: -40, opacity: 0 } }))}
-			  className="z-10 h-full flex shrink-0 items-center px-3 font-bold w-28">
+			  className="z-10 h-full flex items-center px-3 font-bold w-28">
 			<h2>{item.name}</h2>
 		      </motion.div>
 		      {item.subMenu
@@ -452,8 +363,7 @@ const TopNav: FC<Props> = ({ user }) => {
 		  <div className="relative h-[40px]">
 		    {animationsOff
 		     ? (
-			 <div className="absolute inset-0 flex items-center px-3
-					 overflow-x-auto whitespace-nowrap">
+			 <div className="absolute inset-0 flex items-center px-3">
 			   {(visibleMenu[activeIdx]?.subMenu ?? [])
 			    .filter (item => item.visible ?? true)
 			    .map ((item, i) => (
@@ -482,8 +392,7 @@ const TopNav: FC<Props> = ({ user }) => {
 			       variants={{ enter: (d: -1 | 1) => ({ y: d * 24, opacity: 0 }),
 					   centre: { y: 0, opacity: 1 },
 					   exit: (d: -1 | 1) => ({ y: (-d) * 24, opacity: 0 }) }}
-			       className="absolute inset-0 flex items-center px-3
-					  overflow-x-auto whitespace-nowrap"
+			       className="absolute inset-0 flex items-center px-3"
 			       initial="enter"
 			       animate="centre"
 			       exit="exit"
@@ -523,7 +432,7 @@ const TopNav: FC<Props> = ({ user }) => {
 	 ? (
 	     menuOpen && (
 		 <div
-		     className={cn ('top-nav-root top-nav-mobile-menu flex flex-col',
+		     className={cn ('top-nav-root top-nav-mobile-menu flex flex-col md:hidden',
 				    'items-start')}>
 		   <Separator/>
 		   {visibleMenu.map ((item, i) => (
@@ -567,6 +476,9 @@ const TopNav: FC<Props> = ({ user }) => {
 		       </Fragment>))}
 		   <PrefetchLink
 		       to="/more"
+		       ref={(el: (HTMLAnchorElement | null)) => {
+			 itemsRef.current[visibleMenu.length] = el
+		       }}
 		       className={cn ('top-nav-mobile-row w-full min-h-[40px] flex items-center pl-8',
 				      ((openItemIdx < 0)
 				       && 'top-nav-mobile-active font-bold'))}>
@@ -580,7 +492,7 @@ const TopNav: FC<Props> = ({ user }) => {
 	       {menuOpen && (
 		   <motion.div
 		       key="spmenu"
-		       className={cn ('top-nav-root top-nav-mobile-menu flex flex-col',
+		       className={cn ('top-nav-root top-nav-mobile-menu flex flex-col md:hidden',
 				      'items-start')}
 		       variants={{ closed: { clipPath: 'inset(0 0 100% 0)',
 					     height:   0 },
@@ -646,6 +558,9 @@ const TopNav: FC<Props> = ({ user }) => {
 			 </Fragment>))}
 		     <PrefetchLink
 			 to="/more"
+			 ref={(el: (HTMLAnchorElement | null)) => {
+			   itemsRef.current[visibleMenu.length] = el
+			 }}
 			 className={cn ('top-nav-mobile-row w-full min-h-[40px] flex items-center pl-8',
 					((openItemIdx < 0)
 					 && 'top-nav-mobile-active font-bold'))}>
@@ -655,7 +570,7 @@ const TopNav: FC<Props> = ({ user }) => {
 		     <Separator/>
 		   </motion.div>)}
 	     </AnimatePresence>)}
-      </div>)
+      </>)
 }
 
 export default TopNav

frontend/src/components/TopNavUser.tsx

@@ -15,8 +15,8 @@ const TopNavUser: FC<Props> = ({ user, sp }) => {
     return
 
   const className = cn ((sp
-			 ? 'top-nav-user-mobile w-full min-h-[40px] flex items-center pl-8'
-			 : 'top-nav-user-desktop shrink-0 whitespace-nowrap ml-auto'),
+			 ? 'md:hidden w-full min-h-[40px] flex items-center pl-8'
+			 : 'hidden md:block ml-auto pr-4'),
 		        'font-bold text-red-600 hover:text-red-400',
 		        'dark:text-yellow-400 dark:hover:text-yellow-200')
 
@@ -30,4 +30,4 @@ const TopNavUser: FC<Props> = ({ user, sp }) => {
       </>)
 }
 
-export default TopNavUser
+export default TopNavUser

frontend/src/index.css

@@ -197,244 +197,12 @@ body
   background: var(--top-nav-root-bg-mobile);
 }
 
-.top-nav-bar
-{
-  padding-inline: 8px;
-  column-gap: 4px;
-}
-
-.top-nav-primary
-{
-  column-gap: 4px;
-}
-
-.top-nav-layout .top-nav-brand-link
-{
-  margin-inline: 4px;
-  font-size: 1rem;
-}
-
-.top-nav-desktop-menu,
-.top-nav-desktop-submenu,
-.top-nav-user-desktop
-{
-  display: none;
-}
-
-.top-nav-desktop-menu
-{
-  font-size: .875rem;
-}
-
-.top-nav-desktop-menu .top-nav-menu-link
-{
-  padding-inline: 8px;
-}
-
-.top-nav-user-desktop
-{
-  padding-right: 4px;
-  font-size: .875rem;
-}
-
-.top-nav-user-mobile
-{
-  overflow-wrap: anywhere;
-}
-
 @media (min-width: 768px)
 {
-  .top-nav-layout .top-nav-brand-link
-  {
-    font-size: 1.125rem;
-  }
-
-  .top-nav-layout[data-desktop='true'] .top-nav-root
+  .top-nav-root
   {
     background: var(--top-nav-root-bg-desktop);
   }
-
-  .top-nav-layout[data-desktop='true'] .top-nav-desktop-menu,
-  .top-nav-layout[data-measuring] .top-nav-desktop-menu
-  {
-    display: flex;
-  }
-
-  .top-nav-layout[data-desktop='true'] .top-nav-user-desktop,
-  .top-nav-layout[data-measuring] .top-nav-user-desktop,
-  .top-nav-layout[data-desktop='true'] .top-nav-desktop-submenu
-  {
-    display: block;
-  }
-
-  .top-nav-layout[data-desktop='true'] .top-nav-mobile-toggle,
-  .top-nav-layout[data-measuring] .top-nav-mobile-toggle,
-  .top-nav-layout[data-desktop='true'] .top-nav-mobile-menu,
-  .top-nav-layout[data-desktop='true'] .top-nav-user-mobile
-  {
-    display: none;
-  }
-
-  .top-nav-layout[data-measuring]
-  {
-    visibility: hidden;
-  }
-}
-
-@media (min-width: 1024px)
-{
-  .top-nav-bar
-  {
-    padding-inline: 12px;
-    column-gap: 8px;
-  }
-
-  .top-nav-primary
-  {
-    column-gap: 6px;
-  }
-
-  .top-nav-layout .top-nav-brand-link
-  {
-    margin-inline: 8px;
-    font-size: 1.25rem;
-  }
-
-  .top-nav-desktop-menu
-  {
-    column-gap: 2px;
-  }
-
-  .top-nav-desktop-menu,
-  .top-nav-user-desktop
-  {
-    font-size: .9375rem;
-  }
-
-  .top-nav-desktop-menu .top-nav-menu-link
-  {
-    padding-inline: 12px;
-  }
-
-  .top-nav-user-desktop
-  {
-    padding-right: 8px;
-  }
-}
-
-@media (min-width: 1280px)
-{
-  .top-nav-bar
-  {
-    column-gap: 12px;
-  }
-
-  .top-nav-primary
-  {
-    column-gap: 8px;
-  }
-
-  .top-nav-layout .top-nav-brand-link
-  {
-    margin-inline: 16px;
-  }
-
-  .top-nav-desktop-menu
-  {
-    column-gap: 4px;
-  }
-
-  .top-nav-desktop-menu,
-  .top-nav-user-desktop
-  {
-    font-size: 1rem;
-  }
-
-  .top-nav-desktop-menu .top-nav-menu-link
-  {
-    padding-inline: 20px;
-  }
-
-  .top-nav-user-desktop
-  {
-    padding-right: 16px;
-  }
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-bar
-{
-  padding-inline: 12px;
-  column-gap: 8px;
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-primary
-{
-  column-gap: 6px;
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-brand-link
-{
-  margin-inline: 8px;
-  font-size: 1.25rem;
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-desktop-menu
-{
-  column-gap: 2px;
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-desktop-menu,
-.top-nav-layout[data-density='comfortable'] .top-nav-user-desktop
-{
-  font-size: .9375rem;
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-desktop-menu .top-nav-menu-link
-{
-  padding-inline: 12px;
-}
-
-.top-nav-layout[data-density='comfortable'] .top-nav-user-desktop
-{
-  padding-right: 8px;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-bar
-{
-  padding-inline: 8px;
-  column-gap: 4px;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-primary
-{
-  column-gap: 4px;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-brand-link
-{
-  margin-inline: 4px;
-  font-size: 1.125rem;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-desktop-menu
-{
-  column-gap: 0;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-desktop-menu,
-.top-nav-layout[data-density='compact'] .top-nav-user-desktop
-{
-  font-size: .875rem;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-desktop-menu .top-nav-menu-link
-{
-  padding-inline: 8px;
-}
-
-.top-nav-layout[data-density='compact'] .top-nav-user-desktop
-{
-  padding-right: 4px;
 }
 
 .top-nav-brand-link,

frontend/src/lib/help.test.ts

@@ -1,130 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { createHelpFixture } from '@/test/helpFixtures'
-
-
-describe ('Help file catalogue', () => {
-  it.each ([['Éclair', 'eclair'], ['home', 'HOME'], ['e\u0301clair', 'Éclair']]) (
-      'compares title %s and %s equally at primary strength', (a, b) => {
-	const { api } = createHelpFixture ()
-	expect (api.compareHelpTitles (a, b)).toBe (0)
-      })
-
-  it ('orders distinct Latin titles in both directions', () => {
-    const { api } = createHelpFixture ()
-    expect (api.compareHelpTitles ('Apple', 'Zebra')).toBeLessThan (0)
-    expect (api.compareHelpTitles ('Zebra', 'Apple')).toBeGreaterThan (0)
-  })
-
-  it.each ([['ほーむ', 'ホーム'], ['ホーム', 'ほーむ'], ['ﾎｰﾑ', 'ホーム'],
-      ['ＡＢＣ', 'abc'], ['ｶﾞｲﾄﾞ', 'がいど']]) (
-      'normalises search text %s and %s identically', (query, text) => {
-	const { api } = createHelpFixture ()
-	expect (api.normaliseHelpSearchText (query)).toBe (api.normaliseHelpSearchText (text))
-      })
-
-  it.each ([['2026-10-02', null], ['2026-10-02.2', 2],
-      ['2026-10-02.3', 3], ['2026-10-02.10', 10]] as const) (
-      'separates the date and revision of %s', (edition, revision) => {
-	const { api } = createHelpFixture ()
-	expect (api.parseHelpEdition (edition)).toEqual ({ date: '2026-10-02', revision })
-	const date = api.helpEditionDate (edition)!
-	expect ([date.getFullYear (), date.getMonth (), date.getDate ()]).toEqual ([2026, 9, 2])
-      })
-
-  it.each (['missing', '2026-02-30', '2026-10-02.0', '2026-10-02.2.extra',
-      '2026-10-02.9007199254740992']) ('rejects invalid edition %s', edition => {
-    const { api } = createHelpFixture ()
-    expect (api.parseHelpEdition (edition)).toBeNull ()
-    expect (api.helpEditionDate (edition)).toBeNull ()
-  })
-
-  it ('compares numeric revision suffixes without losing the edition identifiers', () => {
-    const { api } = createHelpFixture ()
-    expect (['2026-10-02.10', '2026-10-02.3', '2026-10-02', '2026-10-02.2']
-	.sort (api.compareHelpEditions)).toEqual ([
-	'2026-10-02', '2026-10-02.2', '2026-10-02.3', '2026-10-02.10'])
-  })
-
-  it ('uses current_edition rather than the newest file, without YAML titles', async () => {
-    const { api } = createHelpFixture ()
-    expect ((await api.getHelpArticle ('guide'))?.languages.ja.currentEdition)
-	.toBe ('2026-10-02.10')
-    expect (await api.getHelpSearchEntries ('ja')).toEqual ([
-	{ identifier: 'guide', edition: '2026-10-02.10',
-	  title: 'ホーム第十版', body: '\nタグを検索する 第十版本文' },
-	{ identifier: '設定 手順', edition: '2026-10-03',
-	  title: '設定', body: '\nタグを設定する' }])
-  })
-
-  it ('orders published editions numerically and separates languages', async () => {
-    const { api } = createHelpFixture ()
-    expect (await api.getHelpEditions ('guide', 'ja')).toEqual ([
-	'2026-10-01', '2026-10-02', '2026-10-02.2', '2026-10-02.3', '2026-10-02.10'])
-    expect (await api.getHelpEditions ('guide', 'en')).toEqual (['2026-10-02'])
-    expect (await api.getHelpPublishedEditions ('guide', 'ja'))
-	.not.toContain ('2026-10-02.11')
-  })
-
-  it ('uses generated edition titles without reparsing raw sources', async () => {
-    const { api, raw } = createHelpFixture ()
-    expect (await api.getHelpEditionText ('guide', 'ja', '2026-10-01'))
-	.toEqual ({ title: '旧ホーム', body: '\n過去限定本文' })
-    raw['../../help/guide/editions/ja/2026-10-02.mdx']
-	.mockResolvedValue ('\uFEFF# 改題\r\n\r\n本文\r\n# 別見出し')
-    expect (await api.getHelpEditionText ('guide', 'ja', '2026-10-02'))
-	.toEqual ({ title: 'ホーム', body: '\nタグを検索する' })
-    expect (raw['../../help/guide/editions/ja/2026-10-02.mdx']).not.toHaveBeenCalled ()
-    expect ((await api.getHelpEditionSource ('guide', 'ja', '2026-10-02'))?.source)
-	.toBe ('\uFEFF# 改題\r\n\r\n本文\r\n# 別見出し')
-  })
-
-  it ('returns missing resources without substituting another edition', async () => {
-    const { api } = createHelpFixture ()
-    expect (await api.getHelpArticle ('absent')).toBeNull ()
-    expect (await api.getHelpEditions ('absent', 'ja')).toEqual ([])
-    expect (await api.getHelpEdition ('guide', 'ja', 'missing')).toBeNull ()
-    expect (await api.getHelpEditionText ('guide', 'fr', '2026-10-02')).toBeNull ()
-  })
-
-  it ('reports generated search asset failures instead of hiding articles', async () => {
-    const { api, loads } = createHelpFixture ()
-    loads.search.mockImplementationOnce (() => { throw new Error ('asset failure') })
-    await expect (api.getHelpSearchEntries ('ja')).rejects.toThrow ('asset failure')
-  })
-
-  it ('reports raw loading failures and excludes unpublished editions', async () => {
-    const { api, raw } = createHelpFixture ()
-    const loader = raw['../../help/guide/editions/ja/2026-10-02.mdx']
-    loader.mockRejectedValueOnce (new Error ('fixture failure'))
-    await expect (api.getHelpEditionSource ('guide', 'ja', '2026-10-02'))
-	.rejects.toThrow ('fixture failure')
-    expect (await api.getHelpEdition ('guide', 'ja', '2026-10-02.11')).toBeNull ()
-    expect (await api.getHelpEditionSource ('guide', 'ja', '2026-10-02.11')).toBeNull ()
-  })
-
-  it ('compares raw H1 and body lines in the requested direction', async () => {
-    const { api } = createHelpFixture ()
-    const forward = await api.getHelpDiff ('guide', 'ja', '2026-10-01', '2026-10-02.10')
-    expect (forward?.from.title).toBe ('旧ホーム')
-    expect (forward?.to.title).toBe ('ホーム第十版')
-    expect (forward?.lines).toEqual (expect.arrayContaining ([
-	{ type: 'removed', content: '# 旧ホーム\n' },
-	{ type: 'added', content: '# ホーム第十版\n' },
-	{ type: 'unchanged', content: '\n' }]))
-    const reverse = await api.getHelpDiff ('guide', 'ja', '2026-10-02.10', '2026-10-01')
-    expect (reverse?.lines).toEqual (expect.arrayContaining ([
-	{ type: 'added', content: '# 旧ホーム\n' },
-	{ type: 'removed', content: '# ホーム第十版\n' }]))
-  })
-
-  it.each ([['missing', 'ja', '2026-10-01', '2026-10-02.10'],
-      ['guide', 'ja', '2026-10-01', '2026-10-02.11'],
-      ['guide', 'en', '2026-10-01', '2026-10-02']]) (
-      'rejects invalid diff editions for %s/%s without reading sources',
-      async (id, language, from, to) => {
-	const { api, raw } = createHelpFixture ()
-	expect (await api.getHelpDiff (id, language, from, to)).toBeNull ()
-	Object.values (raw).forEach (load => expect (load).not.toHaveBeenCalled ())
-      })
-})

frontend/src/lib/help.ts

@@ -1,237 +0,0 @@
-import type { ComponentType } from 'react'
-
-type ArticleLanguage = { currentEdition: string; publishedEditions: string[] }
-
-export type ArticleMeta = {
-    identifier: string
-    canonicalLanguage: string
-    languages:  Record<string, ArticleLanguage> }
-
-export type HelpEditionText = {
-    title: string
-    body:  string }
-
-export type HelpSearchEntry = HelpEditionText & {
-    identifier: string
-    edition:    string }
-
-export type HelpEditionContent = HelpEditionText & { content: ComponentType }
-
-export type HelpEditionSource = HelpEditionText & { source: string }
-export type HelpChange = Pick<HelpSearchEntry, 'identifier' | 'edition' | 'title'> & {
-    pred: string | null
-    change: 'new' | 'update'
-    date: string }
-export type HelpTitleIndex = Record<string, string[]>
-export type HelpDiffLine = {
-    type: 'added' | 'removed' | 'unchanged'
-    content: string }
-export type HelpDiff = {
-    from: HelpEditionSource
-    to: HelpEditionSource
-    lines: HelpDiffLine[] }
-
-export type HelpEditionIdentifier = { date: string; revision: number | null }
-
-// Fix the locale and primary strength; ICU versions still differ from MySQL UCA 9.0.
-const helpTitleCollator = new Intl.Collator ('en', {
-    usage: 'sort', sensitivity: 'base', ignorePunctuation: false, numeric: false })
-
-
-export const compareHelpTitles = (a: string, b: string): number =>
-    helpTitleCollator.compare (a, b)
-
-
-export const normaliseHelpSearchText = (value: string): string =>
-    value.normalize ('NFKC').toLowerCase ().replace (/[ァ-ヶヽヾ]/g,
-	character => String.fromCodePoint (character.codePointAt (0)! - 0x60))
-
-
-export const parseHelpEdition = (edition: string): HelpEditionIdentifier | null => {
-  const matched = edition.match (/^(\d{4}-\d{2}-\d{2})(?:\.([1-9]\d*))?$/)
-  if (matched == null)
-    return null
-  const date = new Date (matched[1])
-  const revision = matched[2] == null ? null : Number (matched[2])
-  if (Number.isNaN (date.getTime ()) || date.toISOString ().slice (0, 10) !== matched[1]
-      || (revision != null && !(Number.isSafeInteger (revision))))
-    return null
-  return { date: matched[1], revision }
-}
-
-
-export const compareHelpEditions = (a: string, b: string): number => {
-  const before = parseHelpEdition (a)
-  const after = parseHelpEdition (b)
-  if (before == null || after == null)
-    return a.localeCompare (b)
-  return before.date.localeCompare (after.date)
-      || (before.revision ?? 1) - (after.revision ?? 1)
-}
-
-
-export const helpEditionDate = (edition: string): Date | null => {
-  const parsed = parseHelpEdition (edition)
-  return parsed == null ? null : new Date (`${ parsed.date }T00:00:00`)
-}
-
-
-export const getHelpArticle = async (identifier: string): Promise<ArticleMeta | null> => {
-  const { default: articles } = await import ('virtual:help/articles')
-  return Object.hasOwn (articles, identifier) ? articles[identifier] : null
-}
-
-
-export const getHelpEditions = async (
-    identifier: string,
-    language: string,
-): Promise<string[]> => {
-  const article = await getHelpArticle (identifier)
-  return article?.languages[language]?.publishedEditions ?? []
-}
-
-
-export const getHelpPublishedEditions = async (
-    identifier: string,
-    language: string,
-): Promise<string[]> => await getHelpEditions (identifier, language)
-
-
-export const getHelpEdition = async (
-    identifier: string,
-    language: string,
-    edition: string,
-): Promise<ComponentType | null> => {
-  const { components } = await import ('virtual:help/loaders')
-  const loader = components[`${ identifier }/${ language }/${ edition }`]
-
-  if (!(loader))
-    return null
-
-  return (await loader ()).default
-}
-
-
-export const getHelpEditionSource = async (
-    identifier: string,
-    language: string,
-    edition: string,
-): Promise<HelpEditionSource | null> => {
-  const { sources } = await import ('virtual:help/loaders')
-  const loader = sources[`${ identifier }/${ language }/${ edition }`]
-
-  if (!(loader))
-    return null
-
-  const [source, text] = await Promise.all ([
-      loader (), getHelpEditionText (identifier, language, edition)])
-  return text == null ? null : { source: source.default, ...text }
-}
-
-
-export const getHelpEditionText = async (
-    identifier: string,
-    language: string,
-    edition: string,
-): Promise<HelpEditionText | null> => {
-  const { texts } = await import ('virtual:help/loaders')
-  const loader = texts[`${ identifier }/${ language }/${ edition }`]
-  return loader == null ? null : (await loader ()).default
-}
-
-
-export const getHelpSearchEntries = async (
-    language: string,
-): Promise<HelpSearchEntry[]> => {
-  const { default: search } = await import ('virtual:help/search')
-  return search[language] ?? []
-}
-
-
-export const getHelpEditionContent = async (
-    identifier: string,
-    language: string,
-    edition: string,
-): Promise<HelpEditionContent | null> => {
-  const [content, text] = await Promise.all ([
-      getHelpEdition (identifier, language, edition),
-      getHelpEditionText (identifier, language, edition)])
-
-  return content != null && text != null ? { content, ...text } : null
-}
-
-
-export const getHelpChanges = async (language: string): Promise<HelpChange[]> => {
-  const { default: changes } = await import ('virtual:help/changes')
-  return changes[language] ?? []
-}
-
-
-export const getHelpTitleIndex = async (language: string): Promise<HelpTitleIndex> => {
-  const { default: titles } = await import ('virtual:help/titles')
-  return titles[language] ?? { }
-}
-
-
-const diffHelpLines = (from: string, to: string): HelpDiffLine[] => {
-  const before = from.match (/[^\n]*\n|[^\n]+$/g) ?? []
-  const after = to.match (/[^\n]*\n|[^\n]+$/g) ?? []
-  const lengths = Array.from ({ length: before.length + 1 },
-      () => new Uint32Array (after.length + 1))
-
-  for (let i = before.length - 1; i >= 0; --i)
-  {
-    for (let j = after.length - 1; j >= 0; --j)
-    {
-      lengths[i][j] =
-	  before[i] === after[j]
-	  ? lengths[i + 1][j + 1] + 1
-	  : Math.max (lengths[i + 1][j], lengths[i][j + 1])
-    }
-  }
-
-  const lines: HelpDiffLine[] = []
-  let i = 0
-  let j = 0
-  while (i < before.length || j < after.length)
-  {
-    if (i < before.length && j < after.length && before[i] === after[j])
-    {
-      lines.push ({ type: 'unchanged', content: before[i] })
-      ++i
-      ++j
-    }
-    else if (i < before.length
-	     && (j === after.length || lengths[i + 1][j] >= lengths[i][j + 1]))
-    {
-      lines.push ({ type: 'removed', content: before[i] })
-      ++i
-    }
-    else
-    {
-      lines.push ({ type: 'added', content: after[j] })
-      ++j
-    }
-  }
-  return lines
-}
-
-
-export const getHelpDiff = async (
-    identifier: string,
-    language: string,
-    from: string,
-    to: string,
-): Promise<HelpDiff | null> => {
-  const editions = await getHelpPublishedEditions (identifier, language)
-  if (!(editions.includes (from)) || !(editions.includes (to)))
-    return null
-
-  const [before, after] = await Promise.all ([
-      getHelpEditionSource (identifier, language, from),
-      getHelpEditionSource (identifier, language, to)])
-  if (before == null || after == null)
-    return null
-
-  return { from: before, to: after, lines: diffHelpLines (before.source, after.source) }
-}

frontend/src/lib/helpPrefetch.test.tsx

@@ -1,126 +0,0 @@
-import { QueryClient } from '@tanstack/react-query'
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { Route, Routes, useLocation } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import PrefetchLink from '@/components/PrefetchLink'
-import * as prefetchers from '@/lib/prefetchers'
-import HelpDetailPage from '@/pages/help/HelpDetailPage'
-import HelpDiffPage from '@/pages/help/HelpDiffPage'
-import { helpFixture } from '@/test/helpFixtures'
-import { renderWithProviders } from '@/test/render'
-
-const settings = vi.hoisted (() => ({ linkPreload: 'intent' }))
-vi.mock ('@/lib/useClientBehaviourSettings', () => ({
-    useClientBehaviourSettings: () => settings }))
-vi.mock ('@/lib/help', async () => (await import ('@/test/helpFixtures')).helpFixture.api)
-
-
-const Location = () => {
-  const location = useLocation ()
-  return <output data-testid="location">{location.pathname}</output>
-}
-
-
-describe ('Help prefetch integration', () => {
-  beforeEach (() => {
-    helpFixture.reset ()
-    settings.linkPreload = 'intent'
-    vi.clearAllMocks ()
-  })
-
-  it.each (['/help', '/help?title=ホーム&text=検索&page=2', '/help/guide', '/help/changes',
-      '/help/guide/diff?from=2026-10-01&to=2026-10-02.10',
-      '/help/%E8%A8%AD%E5%AE%9A%20%E6%89%8B%E9%A0%86?edition=2026-10-03']) (
-      'registers a unique prefetcher for %s', path => {
-	const url = new URL (path, window.location.origin)
-	expect (prefetchers.routePrefetchers.filter (entry => entry.test (url))).toHaveLength (1)
-      })
-
-  it ('loads and reuses the same MDX module for repeated prefetch and display', async () => {
-    const { queryClient } = renderWithProviders (
-	<>
-	  <PrefetchLink to="/help/guide">Help</PrefetchLink>
-	  <Routes>
-	    <Route path="/" element={null}/>
-	    <Route path="/help/:identifier" element={<HelpDetailPage/>}/>
-	  </Routes>
-	</>)
-    const loader = helpFixture.moduleLoads['../../help/guide/editions/ja/2026-10-02.10.mdx']
-    await Promise.all ([
-	prefetchers.prefetchForURL (queryClient, '/help/guide'),
-	prefetchers.prefetchForURL (queryClient, '/help/guide')])
-    expect (loader).toHaveBeenCalledTimes (1)
-    fireEvent.click (screen.getByRole ('link', { name: 'Help' }))
-    await screen.findByRole ('heading', { name: 'ホーム第十版' })
-    expect (loader).toHaveBeenCalledTimes (1)
-  })
-
-  it ('prefetches the requested identifier and edition independently', async () => {
-    const client = new QueryClient ()
-    await prefetchers.prefetchForURL (client, '/help/guide?edition=2026-10-02.3')
-    await prefetchers.prefetchForURL (client, `/help/${encodeURIComponent ('設定 手順')}`)
-    expect (helpFixture.modules['../../help/guide/editions/ja/2026-10-02.3.mdx'])
-	.toHaveBeenCalledTimes (1)
-    expect (helpFixture.modules['../../help/設定 手順/editions/ja/2026-10-03.mdx'])
-	.toHaveBeenCalledTimes (1)
-    expect (helpFixture.modules['../../help/guide/editions/en/2026-10-02.mdx'])
-	.not.toHaveBeenCalled ()
-  })
-
-  it ('loads history editions without treating changes as an article', async () => {
-    const article = vi.spyOn (helpFixture.api, 'getHelpArticle')
-    await prefetchers.prefetchForURL (new QueryClient (), '/help/changes')
-    expect (article).not.toHaveBeenCalledWith ('changes')
-    expect (helpFixture.loads.changes).toHaveBeenCalledTimes (1)
-    Object.values (helpFixture.raw).forEach (load => expect (load).not.toHaveBeenCalled ())
-    Object.values (helpFixture.modules).forEach (load => expect (load).not.toHaveBeenCalled ())
-  })
-
-  it ('reuses two prefetched raw editions when displaying their diff', async () => {
-    const path = '/help/guide/diff?from=2026-10-01&to=2026-10-02.10'
-    const { queryClient } = renderWithProviders (
-	<>
-	  <PrefetchLink to={path}>diff</PrefetchLink>
-	  <Routes>
-	    <Route path="/" element={null}/>
-	    <Route path="/help/:identifier/diff" element={<HelpDiffPage/>}/>
-	  </Routes>
-	</>)
-    await Promise.all ([prefetchers.prefetchForURL (queryClient, path),
-	prefetchers.prefetchForURL (queryClient, path)])
-    fireEvent.click (screen.getByRole ('link', { name: 'diff' }))
-    expect (await screen.findByRole ('link', { name: '旧ホーム (2026-10-01)' }))
-	.toHaveAttribute ('href', '/help/guide?edition=2026-10-01')
-    expect (screen.getByText ('+ # ホーム第十版')).toBeInTheDocument ()
-    Object.entries (helpFixture.raw).forEach (([name, load]) => {
-      const expected = /\/ja\/(2026-10-01|2026-10-02\.10)\.mdx$/.test (name) ? 1 : 0
-      expect (load).toHaveBeenCalledTimes (expected)
-    })
-    Object.values (helpFixture.modules).forEach (load => expect (load).not.toHaveBeenCalled ())
-  })
-
-  it.each (['intent', 'off']) ('respects %s intent settings and still prefetches clicks',
-      async mode => {
-	settings.linkPreload = mode
-	const run = vi.spyOn (prefetchers, 'prefetchForURL').mockResolvedValue ()
-	renderWithProviders (<><Location/><PrefetchLink to="/help/guide">Help</PrefetchLink></>)
-	const link = screen.getByRole ('link', { name: 'Help' })
-	fireEvent.mouseEnter (link)
-	fireEvent.touchStart (link)
-	expect (run).toHaveBeenCalledTimes (mode === 'intent' ? 2 : 0)
-	fireEvent.click (link)
-	await waitFor (() => expect (screen.getByTestId ('location'))
-	    .toHaveTextContent ('/help/guide'))
-	expect (run).toHaveBeenCalledTimes (mode === 'intent' ? 3 : 1)
-      })
-
-  it ('continues navigation after prefetch failure', async () => {
-    vi.spyOn (console, 'error').mockImplementation (() => {})
-    vi.spyOn (prefetchers, 'prefetchForURL').mockRejectedValue (new Error ('offline'))
-    renderWithProviders (<><Location/><PrefetchLink to="/help/guide">Help</PrefetchLink></>)
-    fireEvent.click (screen.getByRole ('link', { name: 'Help' }))
-    await waitFor (() => expect (screen.getByTestId ('location'))
-	.toHaveTextContent ('/help/guide'))
-  })
-})

frontend/src/lib/prefetchers.ts

@@ -1,13 +1,8 @@
 import { QueryClient } from '@tanstack/react-query'
 import { match } from 'path-to-regexp'
 
-import { getHelpArticle,
-	 getHelpChanges,
-	 getHelpDiff,
-	 getHelpEditionContent,
-	 getHelpSearchEntries } from '@/lib/help'
 import { fetchPost, fetchPosts, fetchPostChanges } from '@/lib/posts'
-import { helpKeys, postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
+import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchNicoTags, fetchTagByName, fetchTag, fetchTagChanges, fetchTags } from '@/lib/tags'
 import { fetchWikiPage,
 	 fetchWikiPageByTitle,
@@ -20,69 +15,12 @@ type Prefetcher = (qc: QueryClient, url: URL) => Promise<void>
 const mPost = match<{ id: string }> ('/posts/:id')
 const mWiki = match<{ title: string }> ('/wiki/:title')
 const mTag = match<{ id: string }> ('/tags/:id')
-const mHelp = match<{ identifier: string }> ('/help/:identifier')
-const mHelpDiff = match<{ identifier: string }> ('/help/:identifier/diff')
 
 
 const boolFromQuery = (value: string | null): boolean =>
     ['1', 'true', 'on', 'yes', ''].includes ((value ?? '').toLowerCase ())
 
 
-const prefetchHelpIndex: Prefetcher = async qc => {
-  await qc.prefetchQuery ({
-      queryKey: helpKeys.index ('ja'),
-      queryFn: () => getHelpSearchEntries ('ja'),
-      staleTime: Infinity })
-}
-
-
-const prefetchHelpShow: Prefetcher = async (qc, url) => {
-  const matched = mHelp (url.pathname)
-  if (!(matched))
-    return
-
-  const { identifier } = matched.params
-  const language = 'ja'
-  const article = await qc.fetchQuery ({
-      queryKey: helpKeys.article (identifier),
-      queryFn: () => getHelpArticle (identifier),
-      staleTime: Infinity })
-  const edition = url.searchParams.get ('edition') ?? article?.languages[language]?.currentEdition
-  if (edition == null)
-    return
-
-  await qc.prefetchQuery ({
-      queryKey: helpKeys.edition (identifier, language, edition),
-      queryFn: () => getHelpEditionContent (identifier, language, edition),
-      staleTime: Infinity })
-}
-
-
-const prefetchHelpChanges: Prefetcher = async qc => {
-  await qc.prefetchQuery ({
-      queryKey: helpKeys.changes ('ja'),
-      queryFn: () => getHelpChanges ('ja'),
-      staleTime: Infinity })
-}
-
-
-const prefetchHelpDiff: Prefetcher = async (qc, url) => {
-  const matched = mHelpDiff (url.pathname)
-  const fromValues = url.searchParams.getAll ('from')
-  const toValues = url.searchParams.getAll ('to')
-  const [from] = fromValues
-  const [to] = toValues
-  if (!(matched) || fromValues.length !== 1 || toValues.length !== 1 || !(from) || !(to))
-    return
-
-  const { identifier } = matched.params
-  await qc.prefetchQuery ({
-      queryKey: helpKeys.diff (identifier, 'ja', from, to),
-      queryFn: () => getHelpDiff (identifier, 'ja', from, to),
-      staleTime: Infinity })
-}
-
-
 const prefetchWikiPagesIndex: Prefetcher = async (qc, url) => {
   const title = url.searchParams.get ('title') ?? ''
 
@@ -285,13 +223,6 @@ const prefetchTagChanges: Prefetcher = async (qc, url) => {
 
 
 export const routePrefetchers: { test: (u: URL) => boolean; run: Prefetcher }[] = [
-    { test: u => /^\/help\/?$/.test (u.pathname), run: prefetchHelpIndex },
-    { test: u => /^\/help\/changes\/?$/.test (u.pathname), run: prefetchHelpChanges },
-    { test: u => Boolean (mHelpDiff (u.pathname)), run: prefetchHelpDiff },
-    { test: u => {
-	const matched = mHelp (u.pathname)
-	return Boolean (matched && matched.params.identifier !== 'changes')
-      }, run: prefetchHelpShow },
     { test: u => ['/', '/posts', '/posts/search'].includes (u.pathname),
       run: prefetchPostsIndex },
     { test: u => (!(['/posts/new', '/posts/changes', '/posts/search'].includes (u.pathname))

frontend/src/lib/queryKeys.ts

@@ -61,14 +61,3 @@ export const wikiKeys = {
     root:   ['wiki'] as const,
     index:  (p: { title?: string }) => ['wiki', 'index', p] as const,
     show:   (title: string, p: { version?: string }) => ['wiki', title, p] as const }
-
-export const helpKeys = {
-    root:    ['help'] as const,
-    index:   (language: string) => ['help', 'index', language] as const,
-    titles:  (language: string) => ['help', 'titles', language] as const,
-    article: (identifier: string) => ['help', 'article', identifier] as const,
-    edition: (identifier: string, language: string, edition: string) =>
-	     ['help', 'edition', identifier, language, edition] as const,
-    diff: (identifier: string, language: string, from: string, to: string) =>
-	  ['help', 'diff', identifier, language, from, to] as const,
-    changes: (language: string) => ['help', 'changes', language] as const }

frontend/src/lib/tags.test.ts

@@ -72,25 +72,11 @@ describe ('tags API functions', () => {
     )
   })
 
-  it ('returns null for a missing named tag while retaining the ID helper contract', async () => {
+  it ('returns null when tag fetches fail', async () => {
+    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
     api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-    api.apiGet.mockRejectedValueOnce ({ isAxiosError: true, response: { status: 404 } })
 
     await expect (fetchTag ('1')).resolves.toBeNull ()
     await expect (fetchTagByName ('unknown')).resolves.toBeNull ()
   })
-
-  it.each ([403, 500]) ('propagates named tag HTTP %s', async status => {
-    const error = { isAxiosError: true, response: { status } }
-    api.apiGet.mockRejectedValueOnce (error)
-    await expect (fetchTagByName ('ホーム')).rejects.toBe (error)
-  })
-
-  it ('propagates named tag network failures and encodes the name', async () => {
-    const error = new Error ('offline')
-    api.apiGet.mockRejectedValueOnce (error)
-    await expect (fetchTagByName ('名前/#%')).rejects.toBe (error)
-    expect (api.apiGet).toHaveBeenLastCalledWith (
-	`/tags/name/${ encodeURIComponent ('名前/#%') }`)
-  })
 })

frontend/src/lib/tags.ts

@@ -1,5 +1,3 @@
-import { isAxiosError } from 'axios'
-
 import { apiGet } from '@/lib/api'
 
 import type { Deerjikist,
@@ -70,13 +68,11 @@ export const fetchExternalTag = async (id: string): Promise<Tag | null> => {
 export const fetchTagByName = async (name: string): Promise<Tag | null> => {
   try
   {
-    return await apiGet (`/tags/name/${ encodeURIComponent (name) }`)
+    return await apiGet (`/tags/name/${ name }`)
   }
-  catch (error)
+  catch
   {
-    if (isAxiosError (error) && error.response?.status === 404)
-      return null
-    throw error
+    return null
   }
 }
 

frontend/src/lib/wiki.test.ts

@@ -2,7 +2,9 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import { fetchWikiPage, fetchWikiPageByTitle, fetchWikiPages } from '@/lib/wiki'
 
-const api = vi.hoisted (() => ({ apiGet: vi.fn () }))
+const api = vi.hoisted (() => ({
+  apiGet: vi.fn (),
+}))
 
 vi.mock ('@/lib/api', () => api)
 
@@ -19,37 +21,28 @@ describe ('wiki API functions', () => {
     await fetchWikiPage ('1', { version: '3' })
 
     expect (api.apiGet).toHaveBeenNthCalledWith (
-	1,
-	'/wiki',
-	{ params: { title: '虹' } })
+        1,
+        '/wiki',
+        { params: { title: '虹' } },
+    )
     expect (api.apiGet).toHaveBeenNthCalledWith (
-	2,
-	'/wiki/1',
-	{ params: { version: '3' } })
+        2,
+        '/wiki/1',
+        { params: { version: '3' } },
+    )
   })
 
   it ('encodes title path segments and returns null on misses', async () => {
     api.apiGet.mockResolvedValueOnce ({ id: 2 })
-    api.apiGet.mockRejectedValueOnce ({ isAxiosError: true, response: { status: 404 } })
+    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
 
     await fetchWikiPageByTitle ('a/b c', { version: undefined })
-    await expect (fetchWikiPageByTitle ('missing', { })).resolves.toBeNull ()
+    await expect (fetchWikiPageByTitle ('missing', {})).resolves.toBeNull ()
 
     expect (api.apiGet).toHaveBeenNthCalledWith (
-	1,
-	'/wiki/title/a%2Fb%20c',
-	{ params: { version: undefined } })
-  })
-
-  it.each ([403, 500]) ('preserves HTTP %s errors', async status => {
-    const error = { isAxiosError: true, response: { status } }
-    api.apiGet.mockRejectedValueOnce (error)
-    await expect (fetchWikiPageByTitle ('ホーム', { })).rejects.toBe (error)
-  })
-
-  it ('preserves network failures for callers', async () => {
-    const error = new Error ('network failure')
-    api.apiGet.mockRejectedValueOnce (error)
-    await expect (fetchWikiPageByTitle ('ホーム', { })).rejects.toBe (error)
+        1,
+        '/wiki/title/a%2Fb%20c',
+        { params: { version: undefined } },
+    )
   })
 })

frontend/src/lib/wiki.ts

@@ -1,5 +1,3 @@
-import { isAxiosError } from 'axios'
-
 import { apiGet } from '@/lib/api'
 
 import type { WikiPage } from '@/types'
@@ -23,10 +21,8 @@ export const fetchWikiPageByTitle = async (
   {
     return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { params: { version } })
   }
-  catch (error)
+  catch
   {
-    if (isAxiosError (error) && error.response?.status === 404)
-      return null
-    throw error
+    return null
   }
 }

frontend/src/mdx-components.test.tsx

@@ -1,77 +0,0 @@
-import { fireEvent, screen, within } from '@testing-library/react'
-import { afterAll, beforeEach, describe, expect, it, vi } from 'vitest'
-import { Route, Routes } from 'react-router-dom'
-
-import HelpDetailPage from '@/pages/help/HelpDetailPage'
-import { compileMdx, transformMdx } from '@/test/compileMdx'
-import { helpFixture } from '@/test/helpFixtures'
-import { renderWithProviders } from '@/test/render'
-
-const prefetch = vi.hoisted (() => vi.fn (async () => {}))
-vi.hoisted (() => {
-  vi.stubGlobal ('Uint8Array', Object.getPrototypeOf (new TextEncoder ().encode ('')).constructor)
-})
-afterAll (() => vi.unstubAllGlobals ())
-vi.mock ('@/lib/prefetchers', () => ({ prefetchForURL: prefetch }))
-vi.mock ('@/lib/help', async () => (await import ('@/test/helpFixtures')).helpFixture.api)
-
-const tableSource = [
-    '# 表のある記事', '', '| 項目 | 説明 |', '| --- | --- |',
-    '| [ヘルプ](/help/guide) | **強調** |', '| 通常 | 本文 |'].join ('\n')
-
-
-describe ('Help MDX with the application compiler', () => {
-  beforeEach (() => helpFixture.reset ())
-
-  it ('compiles GFM table structure, links and emphasis', async () => {
-    const Content = await compileMdx (tableSource)
-    renderWithProviders (<Content/>)
-    const table = screen.getByRole ('table')
-    expect (table.querySelector ('thead')).not.toBeNull ()
-    expect (table.querySelector ('tbody')).not.toBeNull ()
-    expect (within (table).getAllByRole ('columnheader')).toHaveLength (2)
-    expect (within (table).getAllByRole ('cell')).toHaveLength (4)
-    expect (within (table).getByRole ('link', { name: 'ヘルプ' }))
-	.toHaveAttribute ('href', '/help/guide')
-    expect (table.querySelector ('strong')).toHaveTextContent ('強調')
-  })
-
-  it ('retains headings, paragraphs and lists', async () => {
-    const Content = await compileMdx ('# 見出し\n\n本文\n\n- 第一\n- 第二')
-    renderWithProviders (<Content/>)
-    expect (screen.getByRole ('heading', { level: 1 })).toHaveTextContent ('見出し')
-    expect (screen.getByText ('本文').tagName).toBe ('P')
-    expect (screen.getAllByRole ('listitem')).toHaveLength (2)
-  })
-
-  it ('keeps tables inside the Help dark-mode typography container', async () => {
-    const Content = await compileMdx (tableSource)
-    helpFixture.modules['../../help/guide/editions/ja/2026-10-02.10.mdx']
-	.mockResolvedValue ({ default: Content })
-    renderWithProviders (
-	<Routes><Route path="/help/:identifier" element={<HelpDetailPage/>}/></Routes>,
-	{ route: '/help/guide' })
-    const table = await screen.findByRole ('table')
-    expect (table.closest ('article')).toHaveClass ('prose', 'dark:prose-invert')
-  })
-
-  it ('preserves long cell contents when rendering a wide table', async () => {
-    const cell = 'wide'.repeat (100)
-    const Content = await compileMdx (`| 項目 |\n| --- |\n| ${ cell } |`)
-    renderWithProviders (<Content/>)
-    expect (screen.getByRole ('cell')).toHaveTextContent (cell)
-  })
-
-  it.each (['.mdx?raw', '.mdx?url']) ('preserves the %s transform bypass', async suffix => {
-    expect (await transformMdx (tableSource, suffix)).toBeNull ()
-  })
-
-  it ('uses the common PrefetchLink interaction for internal MDX links', async () => {
-    prefetch.mockClear ()
-    const Content = await compileMdx ('[内部リンク](/help/guide)')
-    renderWithProviders (<Content/>)
-    fireEvent.mouseEnter (screen.getByRole ('link', { name: '内部リンク' }))
-    expect (prefetch).toHaveBeenCalledWith (expect.anything (),
-	new URL ('/help/guide', window.location.origin).href)
-  })
-})

frontend/src/mdx-components.tsx

@@ -1,52 +1,4 @@
-import { useMemo } from 'react'
-import { useLocation } from 'react-router-dom'
-
-import PrefetchLink from '@/components/PrefetchLink'
-
 import type { MDXComponents } from 'mdx/types'
-import type { ComponentProps } from 'react'
 
 
-const MDXLink = (
-    { href, children, ...props }: ComponentProps<'a'>,
-) => {
-  const location = useLocation ()
-  const url = useMemo (() => {
-    try
-    {
-      const base = new URL (location.pathname + location.search, window.location.origin)
-      return href ? new URL (href, base) : null
-    }
-    catch
-    {
-      return null
-    }
-  }, [href, location.pathname, location.search])
-  const internal = url != null
-      && url.origin === window.location.origin
-      && (url.protocol === 'http:' || url.protocol === 'https:')
-  const anchor = href?.startsWith ('#')
-      || (url?.pathname === location.pathname
-	  && url.search === location.search && Boolean (url.hash))
-  const external = url != null && !(internal)
-      && (url.protocol === 'http:' || url.protocol === 'https:')
-
-  if (internal && !(anchor) && props.download == null)
-  {
-    return (
-	<PrefetchLink to={url.pathname + url.search + url.hash} {...props}>
-	  {children}
-	</PrefetchLink>)
-  }
-
-  return (
-      <a href={href}
-	 {...props}
-	 target={external ? props.target ?? '_blank' : props.target}
-	 rel={props.rel ?? 'noopener noreferrer'}>
-	{children}
-      </a>)
-}
-
-
-export const useMDXComponents = (): MDXComponents => ({ a: MDXLink })
+export const useMDXComponents = (): MDXComponents => ({ })

frontend/src/pages/help/HelpChangesPage.test.tsx

@@ -1,55 +0,0 @@
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
-import { render, screen } from '@testing-library/react'
-import { HelmetProvider } from 'react-helmet-async'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { apiGet } from '@/lib/api'
-import App from '@/App'
-import { helpFixture } from '@/test/helpFixtures'
-
-vi.hoisted (() => {
-  window.history.replaceState (null, '', '/help/changes')
-})
-
-vi.mock ('@/lib/help', async () => (await import ('@/test/helpFixtures')).helpFixture.api)
-vi.mock ('@/lib/api', () => ({ apiGet: vi.fn (), apiPost: async () => ({}),
-			    isApiError: () => false }))
-vi.mock ('@/components/TopNav', () => ({ default: () => null }))
-vi.mock ('@/components/DevModeWatermark', () => ({ default: () => null }))
-vi.mock ('@/lib/useClientBehaviourSettings', () => ({
-    useClientBehaviourSettings: () => ({ animation: 'off', linkPreload: 'off' }) }))
-
-
-describe ('Help global edition history', () => {
-  beforeEach (() => helpFixture.reset ())
-
-  it ('routes /help/changes to published editions in date and numeric order', async () => {
-    const client = new QueryClient ({ defaultOptions: { queries: { retry: false } } })
-    const { container } = render (
-	<QueryClientProvider client={client}>
-	  <HelmetProvider><App/></HelmetProvider>
-	</QueryClientProvider>)
-    const links = await screen.findAllByRole ('link')
-    const editions = links.map (link => link.getAttribute ('href'))
-	.filter (href => href?.startsWith ('/help/') && href.includes ('edition='))
-    expect (editions).toEqual ([
-	`/help/${encodeURIComponent ('設定 手順')}?edition=2026-10-03`,
-	'/help/guide?edition=2026-10-02.10', '/help/guide?edition=2026-10-02.3',
-	'/help/guide?edition=2026-10-02.2', '/help/guide?edition=2026-10-02',
-	'/help/guide?edition=2026-10-01'])
-    expect (container).toHaveTextContent ('旧ホーム')
-    expect (screen.getAllByRole ('columnheader').map (cell => cell.textContent))
-	.toEqual (['差分', 'タイトル', '有効開始年月日'])
-    expect (container).not.toHaveTextContent ('未公開ホーム')
-    expect (container).not.toHaveTextContent ('Invalid Date')
-    expect (container.textContent).not.toMatch (/\d{1,2}:\d{2}/)
-    expect (screen.getAllByRole ('link', { name: '差分' }).map (link =>
-	link.getAttribute ('href'))).toEqual ([
-	'/help/guide/diff?from=2026-10-02.3&to=2026-10-02.10',
-	'/help/guide/diff?from=2026-10-02.2&to=2026-10-02.3',
-	'/help/guide/diff?from=2026-10-02&to=2026-10-02.2',
-	'/help/guide/diff?from=2026-10-01&to=2026-10-02'])
-    expect (apiGet).not.toHaveBeenCalled ()
-    expect (window.location.pathname).toBe ('/help/changes')
-  })
-})

frontend/src/pages/help/HelpChangesPage.tsx

@@ -1,119 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { useMemo } from 'react'
-import { Helmet } from 'react-helmet-async'
-import { useSearchParams } from 'react-router-dom'
-
-import PrefetchLink from '@/components/PrefetchLink'
-import PageTitle from '@/components/common/PageTitle'
-import Pagination from '@/components/common/Pagination'
-import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
-import { getHelpChanges, helpEditionDate } from '@/lib/help'
-import { helpKeys } from '@/lib/queryKeys'
-import { LIST_LIMIT_OPTIONS } from '@/lib/settings'
-import { dateString } from '@/lib/utils'
-
-import type { FC } from 'react'
-
-
-const HelpChangesPage: FC = () => {
-  const [searchParams, setSearchParams] = useSearchParams ()
-  const identifier = searchParams.get ('identifier') ?? ''
-  const pageValue = searchParams.get ('page') ?? '1'
-  const pageNumber = Number (pageValue)
-  const requestedPage =
-      (/^[1-9]\d*$/.test (pageValue) && Number.isSafeInteger (pageNumber))
-      ? pageNumber : 1
-  const limit = LIST_LIMIT_OPTIONS.find (
-      value => String (value) === searchParams.get ('limit')) ?? 20
-  const { data: changes = [], isLoading, error } = useQuery ({
-      queryKey: helpKeys.changes ('ja'),
-      queryFn: () => getHelpChanges ('ja'),
-      staleTime: Infinity })
-
-  const results = useMemo (() => identifier
-      ? changes.filter (entry => entry.identifier === identifier)
-      : changes, [changes, identifier])
-  const totalPages = Math.ceil (results.length / limit)
-  const page = requestedPage <= Math.max (1, totalPages) ? requestedPage : 1
-  const pageResults = results.slice ((page - 1) * limit, page * limit)
-
-  const handleLimit = (value: string) => {
-    const next = new URLSearchParams (searchParams)
-    next.set ('limit', value)
-    next.set ('page', '1')
-    setSearchParams (next)
-  }
-
-  return (
-      <MainArea className="min-w-0 max-w-full">
-	<Helmet>
-	  <title>{`ヘルプ改定履歴 | ${ SITE_TITLE }`}</title>
-	</Helmet>
-	<div className="flex flex-wrap items-center justify-between gap-3">
-	  <PageTitle>ヘルプ改定履歴</PageTitle>
-	  <label className="flex items-center gap-2 text-xs text-muted-foreground">
-	    <span>件数</span>
-	    <select value={limit} onChange={ev => handleLimit (ev.target.value)}
-		className="rounded border border-border bg-background px-2 py-1 text-sm
-			   text-foreground">
-	      {LIST_LIMIT_OPTIONS.map (value => (
-		  <option key={value} value={value}>{value}</option>))}
-	    </select>
-	  </label>
-	</div>
-
-	{isLoading
-	 ? <p className="mt-4">読み込み中...</p>
-	 : (error
-	    ? <p className="mt-4 text-red-600" role="alert">{error.message}</p>
-	    : (
-		<div className="mt-4">
-		  <div className="min-w-0 max-w-full overflow-x-auto">
-		    <table className="table-auto w-full min-w-[900px] whitespace-nowrap
-				      border-collapse">
-		      <thead className="border-b-2 border-black dark:border-white">
-			<tr>
-			  <th className="p-2 text-left">差分</th>
-			  <th className="p-2 text-left">タイトル</th>
-			  <th className="p-2 text-left">有効開始年月日</th>
-			</tr>
-		      </thead>
-		      <tbody>
-			{pageResults.map (entry => {
-			  const path = `/help/${ encodeURIComponent (entry.identifier) }`
-			  const diffQuery = new URLSearchParams ({
-			      from: entry.pred ?? '', to: entry.edition })
-			  const diffTo = `${ path }/diff?${ diffQuery.toString () }`
-			  const updatedAt = helpEditionDate (entry.edition)
-
-			  return (
-			      <tr key={`${ entry.identifier }/${ entry.edition }`}
-				  className="even:bg-gray-100 text-gray-900
-					     dark:even:bg-gray-700 dark:text-gray-100">
-				<td className="p-2">
-				  {entry.pred != null && (
-				      <PrefetchLink to={diffTo}>
-					差分
-				      </PrefetchLink>)}
-				</td>
-				<td className="p-2">
-				  <PrefetchLink to={`${ path }?edition=${ entry.edition }`}>
-				    {entry.title}
-				  </PrefetchLink>
-				</td>
-				<td className="p-2">
-				  {updatedAt != null && dateString (updatedAt, 'hour')}
-				</td>
-			      </tr>)
-			})}
-		      </tbody>
-		    </table>
-		  </div>
-		  {totalPages > 0 && <Pagination page={page} totalPages={totalPages}/>}
-		</div>))}
-      </MainArea>)
-}
-
-
-export default HelpChangesPage

frontend/src/pages/help/HelpDetailPage.test.tsx

@@ -1,128 +0,0 @@
-import { act, fireEvent, screen, waitFor } from '@testing-library/react'
-import { Route, Routes, useLocation, useNavigate } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import HelpDetailPage from '@/pages/help/HelpDetailPage'
-import { helpFixture } from '@/test/helpFixtures'
-import { renderWithProviders } from '@/test/render'
-
-import type { ReactElement } from 'react'
-
-vi.mock ('@/lib/help', async () => (await import ('@/test/helpFixtures')).helpFixture.api)
-
-
-const Navigation = () => {
-  const navigate = useNavigate ()
-  const location = useLocation ()
-  return (
-      <>
-	<output data-testid="location">{location.pathname}{location.search}</output>
-	<button onClick={() => navigate ('/help/設定%20手順')}>switch article</button>
-	<button onClick={() => navigate ('/help/guide?edition=2026-10-02.3')}>
-	  switch edition
-	</button>
-      </>)
-}
-
-
-const renderDetail = (route = '/help/guide') => renderWithProviders (
-    <>
-      <Navigation/>
-      <Routes>
-	<Route path="/help/:identifier" element={<HelpDetailPage/>}/>
-      </Routes>
-    </>, { route })
-
-
-describe ('Help details', () => {
-  beforeEach (() => helpFixture.reset ())
-
-  it.each (['2026-10-02', '2026-10-02.2', '2026-10-02.3', '2026-10-02.10']) (
-      'displays a date without inventing a time for edition %s', async edition => {
-	const { container } = renderDetail (`/help/guide?edition=${ edition }`)
-	await screen.findByRole ('heading')
-	expect (container).toHaveTextContent ('10月2日')
-	expect (container).not.toHaveTextContent ('Invalid Date')
-	expect (container.textContent).not.toMatch (/\d{1,2}:\d{2}/)
-	const revision = edition.split ('.')[1]
-	if (revision != null)
-	  expect (container).toHaveTextContent (` .${ revision }`)
-	expect (helpFixture.modules[`../../help/guide/editions/ja/${ edition }.mdx`])
-	    .toHaveBeenCalled ()
-      })
-
-  it ('displays current_edition H1 and body even when newer files exist', async () => {
-    renderDetail ()
-    expect (await screen.findByRole ('heading', { name: 'ホーム第十版' }))
-	.toBeInTheDocument ()
-    expect (screen.getByText ('タグを検索する 第十版本文')).toBeInTheDocument ()
-    expect (screen.queryByText ('未公開限定本文')).not.toBeInTheDocument ()
-    await waitFor (() => expect (document.title).toContain ('ホーム第十版 ヘルプ'))
-  })
-
-  it ('uses the historical H1 in both page and document titles', async () => {
-    renderDetail ('/help/guide?edition=2026-10-01')
-    expect (await screen.findByRole ('heading', { name: '旧ホーム' })).toBeInTheDocument ()
-    expect (screen.getByText ('過去限定本文')).toBeInTheDocument ()
-    await waitFor (() => expect (document.title).toContain ('旧ホーム ヘルプ'))
-    expect (screen.getByText ('(最古)')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '新 >' }))
-	.toHaveAttribute ('href', '/help/guide?edition=2026-10-02')
-  })
-
-  it ('navigates .2, .3 and .10 in numeric edition order', async () => {
-    renderDetail ('/help/guide?edition=2026-10-02.3')
-    await screen.findByRole ('heading', { name: 'ホーム第三版' })
-    expect (screen.getByRole ('link', { name: '< 古' }))
-	.toHaveAttribute ('href', '/help/guide?edition=2026-10-02.2')
-    const next = screen.getByRole ('link', { name: '新 >' })
-    expect (next).toHaveAttribute ('href', '/help/guide?edition=2026-10-02.10')
-    fireEvent.click (next)
-    await screen.findByRole ('heading', { name: 'ホーム第十版' })
-    expect (screen.getByText ('(最新)')).toBeInTheDocument ()
-    expect (screen.queryByText ('第三版本文')).not.toBeInTheDocument ()
-  })
-
-  it.each (['/help/missing', '/help/guide?edition=missing',
-      '/help/guide?edition=2026-02-30', '/help/guide?edition=2026-10-02.2.extra',
-      '/help/guide?edition=2026-10-02.11']) (
-      'shows NotFound without redirecting %s', async route => {
-	renderDetail (route)
-	expect (await screen.findByText ('404')).toBeInTheDocument ()
-	expect (screen.getByTestId ('location')).toHaveTextContent (route)
-      })
-
-  it ('hides the old body and title immediately while another article loads', async () => {
-    let finish!: (value: { default: () => ReactElement }) => void
-    const pending = new Promise<{ default: () => ReactElement }> (resolve => {
-      finish = resolve
-    })
-    helpFixture.modules['../../help/設定 手順/editions/ja/2026-10-03.mdx']
-	.mockReturnValueOnce (pending)
-    renderDetail ()
-    await screen.findByRole ('heading', { name: 'ホーム第十版' })
-    fireEvent.click (screen.getByRole ('button', { name: 'switch article' }))
-    expect (screen.queryByText ('タグを検索する 第十版本文')).not.toBeInTheDocument ()
-    await waitFor (() => expect (document.title).not.toContain ('ホーム'))
-    await act (async () => finish ({ default: () => <h1>設定</h1> }))
-    await screen.findByRole ('heading', { name: '設定' })
-    await waitFor (() => expect (document.title).toContain ('設定 ヘルプ'))
-  })
-
-  it ('ignores a late response for the previous edition', async () => {
-    let finish!: (value: { default: () => ReactElement }) => void
-    const pending = new Promise<{ default: () => ReactElement }> (resolve => {
-      finish = resolve
-    })
-    const loader = helpFixture.modules['../../help/guide/editions/ja/2026-10-02.10.mdx']
-    loader.mockReturnValueOnce (pending)
-    renderDetail ()
-    await waitFor (() => expect (loader).toHaveBeenCalled ())
-    fireEvent.click (screen.getByRole ('button', { name: 'switch edition' }))
-    await screen.findByRole ('heading', { name: 'ホーム第三版' })
-    await act (async () => finish ({ default: () => <h1>遅延した旧本文</h1> }))
-    expect (screen.queryByText ('遅延した旧本文')).not.toBeInTheDocument ()
-    expect (screen.getByRole ('heading', { name: 'ホーム第三版' })).toBeInTheDocument ()
-    await waitFor (() => expect (document.title).toContain ('ホーム第三版 ヘルプ'))
-  })
-})

frontend/src/pages/help/HelpDetailPage.tsx

@@ -1,106 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { Helmet } from 'react-helmet-async'
-import { useLocation, useParams } from 'react-router-dom'
-
-import PrefetchLink from '@/components/PrefetchLink'
-import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
-import { getHelpArticle,
-	 getHelpEditionContent,
-	 helpEditionDate,
-	 parseHelpEdition } from '@/lib/help'
-import { dateString } from '@/lib/utils'
-import { helpKeys } from '@/lib/queryKeys'
-import NotFound from '@/pages/NotFound'
-
-import type { FC } from 'react'
-
-
-const HelpDetailPage: FC = () => {
-  const { identifier = '' } = useParams ()
-  const location = useLocation ()
-
-  // Locale 対応が入るまでは ja 固定
-  const language = 'ja'
-
-  const { data: article, isLoading: articleLoading } = useQuery ({
-      queryKey: helpKeys.article (identifier),
-      queryFn: () => getHelpArticle (identifier),
-      staleTime: Infinity })
-
-  const query = new URLSearchParams (location.search)
-  const requestedEdition = query.get ('edition')
-
-  const languageMeta = article?.languages[language]
-
-  const edition = requestedEdition ?? languageMeta?.currentEdition
-  const editionInfo = parseHelpEdition (edition ?? '')
-  const editionDate = helpEditionDate (edition ?? '')
-
-  const editions = languageMeta?.publishedEditions ?? []
-
-  const index = edition ? editions.indexOf (edition) : -1
-  const pred = index > 0 ? editions[index - 1] : undefined
-  const succ =
-      index >= 0 && index < editions.length - 1
-      ? editions[index + 1]
-      : undefined
-
-  const { data: current, isSuccess, isError } = useQuery ({
-      enabled: edition != null && editionInfo != null && editions.includes (edition),
-      queryKey: helpKeys.edition (identifier, language, edition ?? ''),
-      queryFn: () => getHelpEditionContent (identifier, language, edition ?? ''),
-      staleTime: Infinity })
-
-  if (!articleLoading
-      && (article == null
-	  || languageMeta == null
-	  || edition == null
-	  || editionInfo == null
-	  || !(editions.includes (edition))))
-    return <NotFound/>
-
-  if (isError || (isSuccess && current == null))
-    return <NotFound/>
-
-  const Content = current?.content
-
-  return (
-      <MainArea>
-	<Helmet>
-	  <title>{current?.title || identifier} ヘルプ | {SITE_TITLE}</title>
-	</Helmet>
-
-	{requestedEdition && (
-	    <div className="text-sm flex gap-3 items-center justify-center
-			    border border-gray-700 rounded px-2 py-1 mb-4">
-	      {pred
-	       ? (
-		  <PrefetchLink
-		      to={`/help/${ encodeURIComponent (identifier) }?edition=${ pred }`}>
-		    &lt; 古
-		  </PrefetchLink>)
-	       : '(最古)'}
-
-	      <span>
-		{editionDate != null && dateString (editionDate, 'hour')}
-		{editionInfo?.revision != null && ` .${ editionInfo.revision }`}
-	      </span>
-
-	      {succ
-	       ? (
-		  <PrefetchLink
-		      to={`/help/${ encodeURIComponent (identifier) }?edition=${ succ }`}>
-		    新 &gt;
-		  </PrefetchLink>)
-	       : '(最新)'}
-	    </div>)}
-
-	<article className="prose dark:prose-invert mx-auto p-4">
-	  {Content ? <Content/> : <div>Loading...</div>}
-	</article>
-      </MainArea>)
-}
-
-
-export default HelpDetailPage

frontend/src/pages/help/HelpDiffPage.tsx

@@ -1,81 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { Helmet } from 'react-helmet-async'
-import { useParams, useSearchParams } from 'react-router-dom'
-
-import PrefetchLink from '@/components/PrefetchLink'
-import PageTitle from '@/components/common/PageTitle'
-import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
-import { getHelpDiff } from '@/lib/help'
-import { helpKeys } from '@/lib/queryKeys'
-import { cn } from '@/lib/utils'
-import NotFound from '@/pages/NotFound'
-
-import type { FC } from 'react'
-
-const markers = { added: '+ ', removed: '- ', unchanged: '  ' }
-
-
-const HelpDiffPage: FC = () => {
-  const { identifier = '' } = useParams ()
-  const [searchParams] = useSearchParams ()
-  const from = searchParams.get ('from') ?? ''
-  const to = searchParams.get ('to') ?? ''
-  const validParams = Boolean (identifier && from && to)
-      && searchParams.getAll ('from').length === 1
-      && searchParams.getAll ('to').length === 1
-  const { data: diff, isLoading, isError } = useQuery ({
-      enabled: validParams,
-      queryKey: helpKeys.diff (identifier, 'ja', from, to),
-      queryFn: () => getHelpDiff (identifier, 'ja', from, to),
-      staleTime: Infinity })
-
-  if (!(validParams) || isError || (!(isLoading) && diff == null))
-    return <NotFound/>
-
-  const title = `${ diff?.to.title ?? identifier } (${ from } → ${ to })`
-  const path = `/help/${ encodeURIComponent (identifier) }`
-
-  return (
-      <MainArea className="min-w-0 max-w-full">
-	<Helmet>
-	  <title>{`ヘルプ 差分: ${ title } | ${ SITE_TITLE }`}</title>
-	</Helmet>
-	<PageTitle>{title}</PageTitle>
-
-	{diff
-	 ? (
-	    <>
-	      <div className="flex flex-wrap items-center gap-3">
-		<PrefetchLink to={`${ path }?edition=${ encodeURIComponent (from) }`}>
-		  {diff.from.title} ({from})
-		</PrefetchLink>
-		<span>→</span>
-		<PrefetchLink to={`${ path }?edition=${ encodeURIComponent (to) }`}>
-		  {diff.to.title} ({to})
-		</PrefetchLink>
-	      </div>
-	      <pre className="mt-4 overflow-x-auto whitespace-pre">
-		<code>
-		  {diff.lines.map ((line, index) => {
-		    const colour = cn (
-			'block text-gray-900 dark:text-gray-100',
-			line.type === 'added' && 'bg-green-200 dark:bg-green-800',
-			line.type === 'added' && 'text-green-950 dark:text-green-50',
-			line.type === 'removed' && 'bg-red-200 dark:bg-red-800',
-			line.type === 'removed' && 'text-red-950 dark:text-red-50')
-
-		    return (
-			<span key={index} className={colour}>
-			  {markers[line.type]}{line.content.replace (/\r?\n$/, '')}
-			</span>)
-		  })}
-		</code>
-	      </pre>
-	    </>)
-	 : <div>Loading...</div>}
-      </MainArea>)
-}
-
-
-export default HelpDiffPage

frontend/src/pages/help/HelpListPage.test.tsx

@@ -1,130 +0,0 @@
-import { fireEvent, screen } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import HelpListPage from '@/pages/help/HelpListPage'
-import { helpFixture } from '@/test/helpFixtures'
-import { renderWithProviders } from '@/test/render'
-
-vi.mock ('@/lib/help', async () => (await import ('@/test/helpFixtures')).helpFixture.api)
-
-
-describe ('Help search', () => {
-  beforeEach (() => helpFixture.reset ())
-
-  it ('initially lists each current article once with encoded detail links', async () => {
-    renderWithProviders (<HelpListPage/>, { route: '/help' })
-    expect (await screen.findByRole ('link', { name: 'ホーム第十版' }))
-	.toHaveAttribute ('href', '/help/guide')
-    expect (screen.getByRole ('link', { name: '設定' }))
-	.toHaveAttribute ('href', `/help/${encodeURIComponent ('設定 手順')}`)
-    expect (screen.getByText ('2 件')).toBeInTheDocument ()
-    expect (screen.queryByText ('旧ホーム')).not.toBeInTheDocument ()
-    expect (screen.queryByText ('未公開ホーム')).not.toBeInTheDocument ()
-  })
-
-  it.each ([
-      ['ホーム', '', ['ホーム第十版']],
-      ['', '検索', ['ホーム第十版']],
-      ['', 'タグ', ['設定', 'ホーム第十版']],
-      ['ホーム', '設定', []],
-      ['ホーム', '検索', ['ホーム第十版']],
-      ['旧ホーム', '', []],
-      ['', '過去限定本文', []]]) (
-      'searches title %s and body %s together', async (title, body, expected) => {
-	const { container } = renderWithProviders (<HelpListPage/>)
-	await screen.findByText ('2 件')
-	fireEvent.change (screen.getByRole ('textbox', { name: 'タイトル' }), {
-	    target: { value: title } })
-	fireEvent.change (screen.getByRole ('textbox', { name: '内容' }), {
-	    target: { value: body } })
-	fireEvent.click (screen.getByRole ('button', { name: '検索' }))
-	expect (Array.from (container.querySelectorAll ('tbody a'), link => link.textContent))
-	    .toEqual (expected)
-	if (expected.length === 0)
-	  expect (screen.getByText ('該当する記事がありません．')).toBeInTheDocument ()
-      })
-
-  it ('displays loading failures without stale results', async () => {
-    helpFixture.loads.search.mockImplementationOnce (() => {
-      throw new Error ('fixture loading failed')
-    })
-    renderWithProviders (<HelpListPage/>)
-    expect (await screen.findByRole ('alert')).toHaveTextContent ('fixture loading failed')
-    expect (screen.queryByRole ('link', { name: 'ホーム第十版' })).not.toBeInTheDocument ()
-  })
-
-  it ('sorts edition suffixes numerically and displays their date without a time', async () => {
-    const editions = ['2026-10-02', '2026-10-02.2', '2026-10-02.3', '2026-10-02.10']
-    helpFixture.assets.search.default.ja = editions.map ((edition, index) => ({
-	identifier: `article-${ index }`, edition, title: `article-${ index }`, body: '' }))
-    const { container } = renderWithProviders (<HelpListPage/>, { route: '/help' })
-    await screen.findByText ('4 件')
-    expect (Array.from (container.querySelectorAll ('tbody a'), link => link.textContent))
-	.toEqual (['article-3', 'article-2', 'article-1', 'article-0'])
-    const dates = Array.from (container.querySelectorAll ('tbody tr'), row =>
-	row.children[1].textContent)
-    expect (dates).toHaveLength (4)
-    dates.forEach (date => {
-      expect (date).toContain ('10月2日')
-      expect (date).not.toContain ('Invalid Date')
-      expect (date).not.toMatch (/\d{1,2}:\d{2}/)
-    })
-  })
-
-  it.each ([['ホーム', 'ほーむ', '', true], ['ほーむ', 'ホーム', '', true],
-      ['ホーム', 'ﾎｰﾑ', '', true], ['ホーム', '', 'ホーム', true],
-      ['ホーム', 'ほーむ', 'ﾎｰﾑ', true], ['ホーム', 'ほーむ', '不一致', false]] as const) (
-      'searches title %s with %s and body with %s', async (title, query, text, found) => {
-	const entry = { identifier: 'guide', edition: '2026-10-02.10',
-	    title, body: 'ほーむの案内' }
-	helpFixture.assets.search.default.ja = [entry]
-	const params = new URLSearchParams ({ title: query, text })
-	renderWithProviders (<HelpListPage/>, { route: `/help?${ params }` })
-	await screen.findByText (`${ found ? 1 : 0 } 件`)
-	if (found)
-	  expect (screen.getByRole ('link', { name: title })).toHaveAttribute ('href', '/help/guide')
-	else
-	  expect (screen.queryByRole ('link', { name: title })).not.toBeInTheDocument ()
-	expect (entry).toEqual ({ identifier: 'guide', edition: '2026-10-02.10',
-	    title, body: 'ほーむの案内' })
-      })
-
-  // ai_ci equality is documented by MySQL; these are not captured DB sort results.
-  it.each (['asc', 'desc']) ('orders different titles before identifiers in order %s',
-      async direction => {
-	helpFixture.assets.search.default.ja = [
-	    { identifier: 'alpha', edition: '2026-10-02', title: 'Zebra', body: '' },
-	    { identifier: 'beta', edition: '2026-10-02', title: 'Apple', body: '' }]
-	const { container } = renderWithProviders (<HelpListPage/>, {
-	    route: `/help?order=title:${ direction }` })
-	await screen.findByText ('2 件')
-	const expected = direction === 'asc'
-	    ? ['/help/beta', '/help/alpha'] : ['/help/alpha', '/help/beta']
-	expect (Array.from (container.querySelectorAll ('tbody a'), link =>
-	    link.getAttribute ('href'))).toEqual (expected)
-      })
-
-  it.each (['asc', 'desc']) ('uses identifier ties for MySQL ai_ci title order %s',
-      async direction => {
-	helpFixture.assets.search.default.ja = [
-	    { identifier: 'alpha', edition: '2026-10-02', title: 'Éclair', body: '' },
-	    { identifier: 'beta', edition: '2026-10-02', title: 'eclair', body: '' }]
-	const { container } = renderWithProviders (<HelpListPage/>, {
-	    route: `/help?order=title:${ direction }` })
-	await screen.findByText ('2 件')
-	expect (Array.from (container.querySelectorAll ('tbody a'), link =>
-	    link.getAttribute ('href'))).toEqual (['/help/alpha', '/help/beta'])
-      })
-
-  it.each (['asc', 'desc']) ('ignores title case before identifier ties in order %s',
-      async direction => {
-	helpFixture.assets.search.default.ja = [
-	    { identifier: 'alpha', edition: '2026-10-02', title: 'home', body: '' },
-	    { identifier: 'beta', edition: '2026-10-02', title: 'HOME', body: '' }]
-	const { container } = renderWithProviders (<HelpListPage/>, {
-	    route: `/help?order=title:${ direction }` })
-	await screen.findByText ('2 件')
-	expect (Array.from (container.querySelectorAll ('tbody a'), link =>
-	    link.getAttribute ('href'))).toEqual (['/help/alpha', '/help/beta'])
-      })
-})

frontend/src/pages/help/HelpListPage.tsx

@@ -1,212 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { useEffect, useMemo, useState } from 'react'
-import { Helmet } from 'react-helmet-async'
-import { useSearchParams } from 'react-router-dom'
-
-import PrefetchLink from '@/components/PrefetchLink'
-import SortHeader from '@/components/SortHeader'
-import FormField from '@/components/common/FormField'
-import PageTitle from '@/components/common/PageTitle'
-import Pagination from '@/components/common/Pagination'
-import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
-import { compareHelpEditions,
-	 compareHelpTitles,
-	 getHelpSearchEntries,
-	 helpEditionDate,
-	 normaliseHelpSearchText } from '@/lib/help'
-import { helpKeys } from '@/lib/queryKeys'
-import { LIST_LIMIT_OPTIONS } from '@/lib/settings'
-import { dateString, inputClass } from '@/lib/utils'
-
-import type { FormEvent, FC } from 'react'
-
-type SearchConditions = { title: string; text: string }
-type HelpOrderField = 'title' | 'updated_at'
-type HelpOrder = `${ HelpOrderField }:${ 'asc' | 'desc' }`
-
-const defaultDirection: Record<HelpOrderField, 'asc' | 'desc'> = {
-    title: 'asc', updated_at: 'desc' }
-
-
-const HelpSearchPage: FC = () => {
-  const [searchParams, setSearchParams] = useSearchParams ()
-  const pageValue = searchParams.get ('page') ?? '1'
-  const pageNumber = Number (pageValue)
-  const requestedPage =
-      (/^[1-9]\d*$/.test (pageValue) && Number.isSafeInteger (pageNumber))
-      ? pageNumber : 1
-  const limit = LIST_LIMIT_OPTIONS.find (
-      value => String (value) === searchParams.get ('limit')) ?? 20
-  const requestedOrder = searchParams.get ('order') ?? 'updated_at:desc'
-  const order: HelpOrder =
-      ['title:asc', 'title:desc', 'updated_at:asc', 'updated_at:desc'].includes (requestedOrder)
-      ? requestedOrder as HelpOrder
-      : 'updated_at:desc'
-  const conditions = useMemo<SearchConditions> (() => ({
-      title: searchParams.get ('title') ?? '',
-      text: searchParams.get ('text') ?? '' }), [searchParams])
-  const [title, setTitle] = useState (conditions.title)
-  const [text, setText] = useState (conditions.text)
-  const { data: entries = [], isLoading: loading, error } = useQuery ({
-      queryKey: helpKeys.index ('ja'),
-      queryFn: () => getHelpSearchEntries ('ja'),
-      staleTime: Infinity })
-
-  useEffect (() => {
-    setTitle (conditions.title)
-    setText (conditions.text)
-  }, [conditions.title, conditions.text])
-
-  const results = useMemo (() => {
-    const titleQuery = normaliseHelpSearchText (conditions.title.trim ())
-    const textQuery = normaliseHelpSearchText (conditions.text.trim ())
-    const [field, direction] = order.split (':')
-
-    return (
-	entries.filter (entry => (
-	    (!(titleQuery)
-	     || normaliseHelpSearchText (entry.title).includes (titleQuery))
-	    && (!(textQuery)
-		|| normaliseHelpSearchText (entry.body).includes (textQuery))))
-	.sort ((a, b) => {
-	  const comparison = field === 'title'
-	      ? compareHelpTitles (a.title, b.title)
-	      : compareHelpEditions (a.edition, b.edition)
-
-	  return (direction === 'asc' ? comparison : -comparison)
-	      || a.identifier.localeCompare (b.identifier)
-	}))
-  }, [entries, conditions, order])
-
-  const totalPages = Math.ceil (results.length / limit)
-  const page = requestedPage <= Math.max (1, totalPages) ? requestedPage : 1
-  const pageResults = results.slice ((page - 1) * limit, page * limit)
-
-  const handleLimit = (value: string) => {
-    const next = new URLSearchParams (searchParams)
-    next.set ('limit', value)
-    next.set ('page', '1')
-    setSearchParams (next)
-  }
-
-  const handleSearch = (ev: FormEvent<HTMLFormElement>) => {
-    ev.preventDefault ()
-    const next = new URLSearchParams (searchParams)
-    if (title)
-      next.set ('title', title)
-    else
-      next.delete ('title')
-    if (text)
-      next.set ('text', text)
-    else
-      next.delete ('text')
-    next.set ('page', '1')
-    setSearchParams (next)
-  }
-
-  return (
-      <MainArea className="min-w-0 max-w-full">
-	<Helmet>
-	  <title>{`ヘルプ | ${ SITE_TITLE }`}</title>
-	</Helmet>
-
-	<div className="max-w-xl">
-	  <div className="flex flex-wrap items-center justify-between gap-3">
-	    <PageTitle>ヘルプ検索</PageTitle>
-	    <label className="flex items-center gap-2 text-xs text-muted-foreground">
-	      <span>件数</span>
-	      <select value={limit} onChange={ev => handleLimit (ev.target.value)}
-		  className="rounded border border-border bg-background px-2 py-1 text-sm
-			     text-foreground">
-		{LIST_LIMIT_OPTIONS.map (value => (
-		    <option key={value} value={value}>{value}</option>))}
-	      </select>
-	    </label>
-	  </div>
-	  <form onSubmit={handleSearch} className="space-y-2">
-	    <FormField label="タイトル">
-	      {({ invalid }) => (
-		  <input type="text"
-		      aria-label="タイトル"
-		      value={title}
-		      onChange={e => setTitle (e.target.value)}
-		      className={inputClass (invalid)}/>)}
-	    </FormField>
-
-	    <FormField label="内容">
-	      {({ invalid }) => (
-		  <input type="text"
-		      aria-label="内容"
-		      value={text}
-		      onChange={e => setText (e.target.value)}
-		      className={inputClass (invalid)}/>)}
-	    </FormField>
-
-	    <div className="py-3">
-	      <button type="submit"
-		  className="bg-blue-500 text-white px-4 py-2 rounded">
-		検索
-	      </button>
-	    </div>
-	  </form>
-	</div>
-
-	{loading
-	 ? <p className="mt-4">読み込み中...</p>
-	 : (error
-	    ? <p className="mt-4 text-red-600" role="alert">{error.message}</p>
-	    : (
-		<div className="mt-4">
-		  <p className="mb-2 text-sm" aria-live="polite">{results.length} 件</p>
-		  <div className="min-w-0 max-w-full overflow-x-auto">
-		    <table className="table-auto w-full min-w-[640px] whitespace-nowrap
-				      border-collapse text-gray-900 dark:text-gray-100">
-		      <thead className="border-b-2 border-black dark:border-white">
-			<tr>
-			  <th className="p-2 text-left">
-			    <SortHeader<HelpOrderField>
-				by="title"
-				label="タイトル"
-				currentOrder={order}
-				defaultDirection={defaultDirection}/>
-			  </th>
-			  <th className="p-2 text-left">
-			    <SortHeader<HelpOrderField>
-				by="updated_at"
-				label="有効開始年月日"
-				currentOrder={order}
-				defaultDirection={defaultDirection}/>
-			  </th>
-			</tr>
-		      </thead>
-		      <tbody>
-			{pageResults.map (entry => {
-			  const updatedAt = helpEditionDate (entry.edition)
-
-			  return (
-			      <tr key={entry.identifier}
-				  className="even:bg-gray-100 text-gray-900
-					     dark:even:bg-gray-700 dark:text-gray-100">
-				<td className="p-2">
-				  <PrefetchLink
-				      to={`/help/${encodeURIComponent (entry.identifier)}`}>
-				    {entry.title}
-				  </PrefetchLink>
-				</td>
-				<td className="p-2">
-				  {updatedAt != null && dateString (updatedAt, 'hour')}
-				</td>
-			      </tr>)
-			})}
-		      </tbody>
-		    </table>
-		  </div>
-		  {totalPages > 0 && <Pagination page={page} totalPages={totalPages}/>}
-		  {results.length === 0 && <p className="mt-4">該当する記事がありません．</p>}
-		</div>))}
-      </MainArea>)
-}
-
-
-export default HelpSearchPage

frontend/src/pages/wiki/WikiDetailPage.test.tsx

@@ -1,19 +1,14 @@
-import { act, fireEvent, screen, waitFor, within } from '@testing-library/react'
-import { Route, Routes, useLocation } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { screen } from '@testing-library/react'
+import { Route, Routes } from 'react-router-dom'
+import { describe, expect, it, vi } from 'vitest'
 
-import { apiPost } from '@/lib/api'
-import { getHelpTitleIndex } from '@/lib/help'
-import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
-import WikiNewPage from '@/pages/wiki/WikiNewPage'
-import { buildTag, buildUser, buildWikiPage } from '@/test/factories'
+import { buildTag, buildWikiPage } from '@/test/factories'
 import { renderWithProviders } from '@/test/render'
 
 const wikiApi = vi.hoisted (() => ({
   fetchWikiPage:        vi.fn (),
   fetchWikiPageByTitle: vi.fn (),
-  fetchWikiPages:       vi.fn (),
 }))
 
 const tagsApi = vi.hoisted (() => ({
@@ -27,140 +22,8 @@ const postsApi = vi.hoisted (() => ({
 vi.mock ('@/lib/wiki', () => wikiApi)
 vi.mock ('@/lib/tags', () => tagsApi)
 vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/help', () => ({ getHelpTitleIndex: vi.fn () }))
-vi.mock ('@/lib/api', async importOriginal => ({
-    ...await importOriginal<typeof import ('@/lib/api')> (), apiPost: vi.fn () }))
-vi.mock ('@/components/ui/use-toast', () => ({ toast: vi.fn () }))
-vi.mock ('react-markdown-editor-lite', () => ({
-    default: ({ value, onChange }: {
-	value: string
-	onChange: (event: { text: string }) => void }) => (
-	    <textarea aria-label="本文エディタ" value={value}
-		onChange={event => onChange ({ text: event.target.value })}/>) }))
-
-
-const Location = () => {
-  const location = useLocation ()
-  return <output data-testid="location">{location.pathname}{location.search}</output>
-}
-
 
 describe ('WikiDetailPage', () => {
-  beforeEach (() => {
-    wikiApi.fetchWikiPageByTitle.mockReset ().mockResolvedValue (null)
-    wikiApi.fetchWikiPages.mockReset ().mockResolvedValue ([])
-    tagsApi.fetchTagByName.mockReset ().mockResolvedValue (null)
-    postsApi.fetchPosts.mockReset ().mockResolvedValue ({ posts: [], count: 0 })
-    vi.mocked (getHelpTitleIndex).mockReset ().mockResolvedValue ({ })
-    vi.mocked (apiPost).mockReset ()
-  })
-
-  it ('offers creation for an existing tag after the Help lookup completes', async () => {
-    let finish!: (index: Record<string, string[]>) => void
-    const pending = new Promise<Record<string, string[]>> (resolve => {
-      finish = resolve
-    })
-    vi.mocked (getHelpTitleIndex).mockReturnValueOnce (pending)
-    tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: '既存タグ', hasWiki: false }))
-    renderWithProviders (
-	<Routes><Route path="/wiki/:title" element={<WikiDetailPage/>}/></Routes>,
-	{ route: `/wiki/${ encodeURIComponent ('既存タグ') }` })
-    await waitFor (() => expect (getHelpTitleIndex).toHaveBeenCalled ())
-    expect (screen.queryByText ('404')).not.toBeInTheDocument ()
-    expect (screen.queryByRole ('link', { name: '新規作成してください' }))
-	.not.toBeInTheDocument ()
-    await act (async () => finish ({ }))
-    expect (await screen.findByRole ('link', { name: '新規作成してください' }))
-	.toHaveAttribute ('href', `/wiki/new?title=${ encodeURIComponent ('既存タグ') }`)
-  })
-
-  it ('creates a tag description through the existing form and displays its content', async () => {
-    const page = buildWikiPage ({ title: '既存タグ', body: '説明文',
-	resourceType: 'tag_description' })
-    tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: page.title, hasWiki: false }))
-    vi.mocked (apiPost).mockResolvedValueOnce (page)
-    const path = `/wiki/${ encodeURIComponent (page.title) }`
-    const { container, queryClient } = renderWithProviders (
-	<>
-	  <Location/>
-	  <Routes>
-	    <Route path="/wiki/new" element={<WikiNewPage user={buildUser ({ role: 'member' })}/>}/>
-	    <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
-	  </Routes>
-	</>, { route: path })
-    fireEvent.click (await screen.findByRole ('link', { name: '新規作成してください' }))
-    await screen.findByRole ('heading', { name: '新規 Wiki ページ' })
-    expect (queryClient.getQueryData (wikiKeys.show (page.title, { }))).toBeNull ()
-    queryClient.setQueryData (wikiKeys.index ({ }), [])
-    wikiApi.fetchWikiPageByTitle.mockResolvedValue (page)
-    wikiApi.fetchWikiPages.mockResolvedValue ([page])
-    tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: page.title, hasWiki: true }))
-    expect (screen.getAllByRole ('textbox')[0]).toHaveValue (page.title)
-    fireEvent.change (screen.getByRole ('textbox', { name: '本文エディタ' }), {
-	target: { value: page.body } })
-    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
-    await screen.findByRole ('heading', { name: page.title })
-    expect (screen.getByTestId ('location')).toHaveTextContent (path)
-    expect (screen.queryByRole ('textbox', { name: '本文エディタ' })).not.toBeInTheDocument ()
-    expect (within (container.querySelector ('article')!).getByText (page.body))
-	.toBeInTheDocument ()
-    const form = vi.mocked (apiPost).mock.calls[0][1] as FormData
-    expect (form.get ('title')).toBe (page.title)
-    expect (form.get ('body')).toBe (page.body)
-    expect (apiPost).toHaveBeenCalledWith ('/wiki', form,
-	{ headers: { 'Content-Type': 'multipart/form-data' } })
-    expect (screen.queryByText ('404')).not.toBeInTheDocument ()
-    expect (queryClient.getQueryData (wikiKeys.show (page.title, { }))).toEqual (page)
-    await waitFor (() => expect (queryClient.getQueryData (wikiKeys.index ({ })))
-	.toEqual ([page]))
-    await waitFor (() => expect (queryClient.getQueryData (tagsKeys.show (page.title)))
-	.toMatchObject ({ hasWiki: true }))
-    expect (getHelpTitleIndex).toHaveBeenCalledTimes (1)
-  })
-
-  it ('keeps failed saves on the form without changing cached Wiki or tag state', async () => {
-    const title = '既存タグ'
-    const tag = buildTag ({ name: title, hasWiki: false })
-    const path = `/wiki/new?title=${ encodeURIComponent (title) }`
-    vi.mocked (apiPost).mockRejectedValueOnce (new Error ('save failed'))
-    const { queryClient } = renderWithProviders (
-	<><Location/><WikiNewPage user={buildUser ({ role: 'member' })}/></>, { route: path })
-    queryClient.setQueryData (wikiKeys.show (title, { }), null)
-    queryClient.setQueryData (wikiKeys.index ({ }), [])
-    queryClient.setQueryData (tagsKeys.show (title), tag)
-    fireEvent.change (screen.getByRole ('textbox', { name: '本文エディタ' }), {
-	target: { value: '保存しない本文' } })
-    await act (async () => fireEvent.click (screen.getByRole ('button', { name: '追加' })))
-    expect (apiPost).toHaveBeenCalledTimes (1)
-    expect (screen.getByTestId ('location')).toHaveTextContent (path)
-    expect (screen.getByRole ('heading', { name: '新規 Wiki ページ' })).toBeInTheDocument ()
-    expect (queryClient.getQueryData (wikiKeys.show (title, { }))).toBeNull ()
-    expect (queryClient.getQueryData (tagsKeys.show (title))).toEqual (tag)
-    expect (queryClient.getQueryState (wikiKeys.index ({ }))?.isInvalidated).toBe (false)
-  })
-
-  it ('shows NotFound when neither a tag nor a Help title exists', async () => {
-    renderWithProviders (
-	<Routes><Route path="/wiki/:title" element={<WikiDetailPage/>}/></Routes>,
-	{ route: '/wiki/missing' })
-    expect (await screen.findByText ('404')).toBeInTheDocument ()
-    expect (screen.queryByRole ('link', { name: '新規作成してください' }))
-	.not.toBeInTheDocument ()
-  })
-
-  it.each (['403', '500', 'offline']) ('keeps Wiki error %s distinct from missing content',
-      async message => {
-	wikiApi.fetchWikiPageByTitle.mockRejectedValue (new Error (message))
-	tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: '既存タグ' }))
-	renderWithProviders (
-	    <Routes><Route path="/wiki/:title" element={<WikiDetailPage/>}/></Routes>,
-	    { route: `/wiki/${ encodeURIComponent ('既存タグ') }` })
-	expect (await screen.findByRole ('alert')).toHaveTextContent (message)
-	expect (getHelpTitleIndex).not.toHaveBeenCalled ()
-	expect (screen.queryByRole ('link', { name: '新規作成してください' }))
-	    .not.toBeInTheDocument ()
-      })
-
   it ('renders deprecated state outside the wiki title link', async () => {
     wikiApi.fetchWikiPageByTitle.mockResolvedValueOnce (buildWikiPage ({
       title:        '旧タグ',

frontend/src/pages/wiki/WikiDetailPage.tsx

@@ -1,3 +1,5 @@
+import type { FC } from 'react'
+
 import { useQuery } from '@tanstack/react-query'
 import { useEffect, useMemo } from 'react'
 import { Helmet } from 'react-helmet-async'
@@ -11,14 +13,10 @@ import TabGroup, { Tab } from '@/components/common/TabGroup'
 import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
-import { getHelpTitleIndex } from '@/lib/help'
 import { fetchPosts } from '@/lib/posts'
-import { helpKeys, postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
+import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchTagByName } from '@/lib/tags'
 import { fetchWikiPage, fetchWikiPageByTitle } from '@/lib/wiki'
-import NotFound from '@/pages/NotFound'
-
-import type { FC } from 'react'
 
 import type { Tag } from '@/types'
 
@@ -35,33 +33,15 @@ const WikiDetailPage: FC = () => {
   const query = new URLSearchParams (location.search)
   const version = query.get ('version') || undefined
 
-  const { data: wikiPage, isLoading: loading, isSuccess, isFetching, error } = useQuery ({
+  const { data: wikiPage, isLoading: loading } = useQuery ({
       enabled:  Boolean (title) && !(/^\d+$/.test (title)),
       queryKey: wikiKeys.show (title, { version }),
       queryFn:  () => fetchWikiPageByTitle (title, { version }) })
 
-  const missingWiki = isSuccess && !(isFetching) && wikiPage == null
-  const { data: titleIndex, isPending: lookupPending,
-	  isFetching: lookupFetching, error: lookupError } = useQuery ({
-      enabled: missingWiki,
-      queryKey: helpKeys.titles ('ja'),
-      queryFn: () => getHelpTitleIndex ('ja'),
-      staleTime: Infinity })
-  const lookupTitle = title.trim ().normalize ('NFKC').toLowerCase ().replace (/^ヘルプ:/, '')
-  const identifiers = useMemo (() => (
-      (titleIndex != null && Object.hasOwn (titleIndex, lookupTitle))
-      ? titleIndex[lookupTitle] : []), [titleIndex, lookupTitle])
-
-  useEffect (() => {
-    if (missingWiki && !(lookupFetching) && lookupError == null && identifiers.length === 1)
-      navigate (`/help/${ encodeURIComponent (identifiers[0]) }`, { replace: true })
-  }, [missingWiki, lookupFetching, lookupError, identifiers, navigate])
-
   const effectiveTitle = wikiPage?.title ?? title
   const deprecated = wikiPage?.deprecatedAt != null
 
-  const { data: tag, isPending: tagPending,
-	  isFetching: tagFetching, error: tagError } = useQuery ({
+  const { data: tag } = useQuery ({
       enabled:  Boolean (effectiveTitle),
       queryKey: tagsKeys.show (effectiveTitle),
       queryFn:  () => fetchTagByName (effectiveTitle) })
@@ -93,36 +73,19 @@ const WikiDetailPage: FC = () => {
     if (!(/^\d+$/.test (title)))
       return
 
-    let active = true
     void (async () => {
       try
       {
 	const data = await fetchWikiPage (title, { })
-	if (active)
-	  navigate (`/wiki/${ encodeURIComponent (data.title) }`, { replace: true })
+	navigate (`/wiki/${ encodeURIComponent(data.title) }`, { replace: true })
       }
       catch
       {
 	;
       }
     }) ()
-
-    return () => {
-      active = false
-    }
   }, [title, navigate])
 
-  const displayError = error ?? (missingWiki ? lookupError ?? tagError : null)
-  if (displayError != null)
-    return <MainArea><p role="alert">{displayError.message}</p></MainArea>
-
-  const waiting = loading || (isFetching && wikiPage == null)
-      || (missingWiki && (lookupPending || lookupFetching || tagPending
-			  || (tagFetching && tag == null) || identifiers.length === 1))
-
-  if (missingWiki && !(waiting) && (tag == null || version != null))
-    return <NotFound/>
-
   return (
       <MainArea>
 	<Helmet>
@@ -156,7 +119,7 @@ const WikiDetailPage: FC = () => {
 		     {...(version && { to: `/wiki/${ encodeURIComponent (title) }` })}/>
 	    {deprecated && <span>（廃止）</span>}
 	  </h1>
-	  {waiting ? <div>Loading...</div> : <WikiBody title={title} body={wikiPage?.body}/>}
+	  {loading ? <div>Loading...</div> : <WikiBody title={title} body={wikiPage?.body}/>}
 
 	  {(!(version) && posts.length > 0) && (
 	      <div className="not-prose">