#425

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 =
+    wiki_page_body = material.tag&.tag_name('ja')&.wiki_page&.current_revision&.body
-        TagDescription
-        .find_by(tag_id: material.tag_id, language_code: locale.language_code)
-        &.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_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
 
@@ -770,15 +770,31 @@ class TagsController < ApplicationController
       TagVersioning.ensure_snapshot!(old_owner_tag, created_by_user: current_user)
     end
 
-    current_tag_name&.update!(primary_flg: false, auto_generated: false)
+    current_tag_name.wiki_page&.update!(tag_name_id: promoted_tag_name.id)
-    promoted_tag_name.update!(tag:, primary_flg: true, auto_generated: false)
+    current_tag_name.association(:wiki_page).reset
-    tag.association(:tag_names).reset
+
+    current_tag_name.update!(canonical_id: promoted_tag_name.id,
+                             primary_flg: false, auto_generated: false)
+    promoted_tag_name.update!(tag:, canonical_id: nil, primary_flg: true, auto_generated: false)
+
+    TagName.where(tag:,
+                  language_code: current_tag_name.language_code,
+                  primary_flg: false)
+           .where.not(id: promoted_tag_name.id)
+           .find_each do |alias_tag_name|
+      alias_tag_name.update!(canonical_id: promoted_tag_name.id, primary_flg: false)
+    end
+
+    tag.update!(tag_name_id: promoted_tag_name.id)
+    current_tag_name.association(:wiki_page).reset
+    current_tag_name.association(:tag).reset
+    current_tag_name.reload.update!(canonical_id: promoted_tag_name.id, primary_flg: false)
 
     return unless old_owner_tag && old_owner_tag != tag
 
     record_tag_version!(old_owner_tag.reload, event_type: :update,
                         created_by_user: current_user,
-                        language_code: promoted_tag_name.language_code)
+                        language_code: current_tag_name.language_code)
   end
 
   def update_aliases! locale, tag, alias_names
@@ -786,15 +802,20 @@ class TagsController < ApplicationController
 
     affected_tags = [tag]
 
+    primary_tag_name = TagName.find_by!(tag:,
+                                        language_code: locale.language_code,
+                                        primary_flg: true)
     current_aliases = tag.tag_names.where(language_code: locale.language_code,
                                           primary_flg: false).to_a
 
-    requested_aliases = TagName.where(
+    current_aliases.each do |alias_tag_name|
-        language_code: locale.language_code, name: alias_names)
+      next if alias_names.include?(alias_tag_name.name)
-        .includes(:tag).index_by(&:name)
+
+      affected_tags << alias_tag_name.tag
+    end
 
     alias_names.each do |alias_name|
-      alias_tag_name = requested_aliases[alias_name]
+      alias_tag_name = TagName.find_by(language_code: locale.language_code, name: alias_name)
       if alias_tag_name&.primary? && alias_tag_name.tag_id && alias_tag_name.tag_id != tag.id
         alias_tag_name.errors.add(:name, 'その名前は既に使はれてゐます．')
         raise ActiveRecord::RecordInvalid, alias_tag_name
@@ -810,15 +831,16 @@ class TagsController < ApplicationController
     current_aliases.each do |alias_tag_name|
       next if alias_names.include?(alias_tag_name.name)
 
-      alias_tag_name.destroy!
+      alias_tag_name.update!(canonical_id: nil, tag_id: nil)
     end
 
     alias_names.each do |alias_name|
-      alias_tag_name = requested_aliases[alias_name] || TagName.new(
+      alias_tag_name = TagName.find_or_initialize_by(
           language_code: locale.language_code,
           name: alias_name)
       alias_tag_name.script_code = locale.script_code
-      alias_tag_name.update!(tag:, primary_flg: false, auto_generated: false)
+      alias_tag_name.update!(tag:, primary_flg: false, auto_generated: false,
+                             canonical_id: primary_tag_name.id)
     end
 
     affected_tags.compact.uniq.each do |affected_tag|

backend/app/controllers/wiki_pages_controller.rb

@@ -1,16 +1,16 @@
 class WikiPagesController < ApplicationController
-  # 互換性のための Facade API
+  rescue_from Wiki::Commit::Conflict, with: :render_wiki_conflict
-
-  rescue_from TagDescriptionOperation::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)
+    pages = unmigrated_wiki_pages.includes(tag_name: :tag)
 
-    descriptions = descriptions.order(updated_at: :desc, id: :asc)
+    tag_groups = TagGroup.all
-    tag_groups = TagGroup.order(updated_at: :desc, id: :asc)
     if title.present?
       pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
       descriptions =
@@ -19,13 +19,12 @@ class WikiPagesController < ApplicationController
           .where('tag_names.name LIKE ?', pattern).limit(20)
       tag_groups = tag_groups.where(
           'CONCAT(?, name) LIKE ?', TagGroupRepr::PREFIX, pattern).limit(20)
+      pages = pages.where('tag_names.name LIKE ?', pattern).limit(20)
     end
 
     json = descriptions.map { |description| WikiPageRepr.tag_description(description) }
     json.concat(tag_groups.map { WikiPageRepr.tag_group(_1) })
-    json.sort_by! do |row|
+    json.concat(WikiPageRepr.base(pages))
-      [-row['updated_at'].to_f, row.fetch('resource_type'), row.fetch('id')]
-    end
     json = json.first(20) if title.present?
     render json:
   end
@@ -38,7 +37,11 @@ class WikiPagesController < ApplicationController
     tag_group = TagGroup.find_by(id: params[:id])
     return render_tag_group tag_group if tag_group
 
-    head :not_found
+    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
@@ -55,14 +58,20 @@ class WikiPagesController < ApplicationController
 
     return render_wiki_page_by_tag_description tag_description if tag_description
 
-    head :not_found
+    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
+    head WikiPage.exists?(id: params[:id]) ? :no_content : :not_found
   end
 
   def exists_by_title
@@ -73,7 +82,8 @@ class WikiPagesController < ApplicationController
     end
     return head :no_content if tag_description_by_title(title)
 
-    head :not_found
+    exists = WikiPage.joins(:tag_name).exists?(tag_names: { name: title })
+    head exists ? :no_content : :not_found
   end
 
   def diff
@@ -102,7 +112,15 @@ class WikiPagesController < ApplicationController
                      'title' => "#{ TagGroupRepr::PREFIX }#{ tag_group.name }",
                      'deprecated_at' => nil }
       else
-        return head :not_found
+        page = WikiPage.joins(:tag_name).includes(tag_name: :tag).find(id)
+        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
+        resource = WikiPageRepr.base(page)
       end
     end
 
@@ -134,26 +152,34 @@ class WikiPagesController < ApplicationController
     if title.start_with?(TagGroupRepr::PREFIX)
       name = title.delete_prefix(TagGroupRepr::PREFIX)
       parsed = TagGroupMarkdownParser.parse(body:, group: nil)
-      group = TagGroupOperation.create!(
+      group = TagGroupOperation.create!(name:, **parsed, actor: current_user,
-          name:, **parsed.except(:compatibility_body), 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)
     end
 
-    description =
+    page = if title.include?(':')
-        if title.include?(':')
+      ApplicationRecord.transaction do
-          return render_unprocessable_entity field: :title
+        tag_name = TagName.find_or_create_by!(language_code: 'ja', name: title) do |name|
-        else
+          name.script_code = 'Jpan'
-          tag_name = TagName.find_by(language_code: 'ja', name: title)
+          name.primary_flg = true
-          return render_unprocessable_entity field: :title unless tag_name&.tag
+          name.auto_generated = false
-
-          TagDescriptionOperation.create!(
-              tag: tag_name.tag, body:, created_by_user: current_user, message:)
         end
 
-    render json: WikiPageRepr.tag_description(description), status: :created
+        Wiki::Commit.create_legacy_content!(
+            tag_name:, body:, created_by_user: current_user, message:)
+      end
+    else
+      tag_name = TagName.find_by(language_code: 'ja', name: title)
+      return render_unprocessable_entity field: :title unless tag_name&.tag
+
+      TagDescriptionOperation.create!(
+          tag: tag_name.tag, body:, created_by_user: current_user, message:)
+    end
+
+    render json: WikiPageRepr.base(page), status: :created
   rescue ActiveRecord::RecordInvalid => e
     render_validation_error e.record
   rescue ActiveRecord::RecordNotUnique
@@ -178,38 +204,49 @@ class WikiPagesController < ApplicationController
 
       name = title.delete_prefix(TagGroupRepr::PREFIX)
       parsed = TagGroupMarkdownParser.parse(body:, group:)
-      TagGroupOperation.update!(
+      TagGroupOperation.update!(group:, name:, **parsed, actor: current_user,
-          group:, name:, **parsed.except(:compatibility_body), actor: current_user)
+                                require_compatibility: true)
       return head :ok
     end
 
-    return render_unprocessable_entity field: :title if title.include?(':')
+    page = WikiPage.find_by(id: params[:id])
-    description = TagDescription.find_by(id: params[:id])
+    if legacy_group_page?(page)
-    unless description
+      return render_unprocessable_entity field: :title
-      return render_unprocessable_entity field: :title if group
-      return head :not_found
     end
-    tag = description.tag
+    if group && !legacy_update_identified?(page, title, group)
-    tag_name = tag.tag_name('ja')
+      return render_unprocessable_entity field: :title
-    return render_unprocessable_entity field: :title unless tag_name
+    end
-    return render_unprocessable_entity field: :title if tag_name.name.include?(':')
+    return head :not_found unless page
 
     base_revision_id = params[:base_revision_id].presence
 
     ApplicationRecord.transaction do
-      tag.lock!
+      page.lock!
-      old_title = tag_name.name
+
-      if title != old_title
+      old_title = page.title
+
+      tag = page.tag_name.tag
+
+      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,
+      description = TagDescription.find_by(id: page.id)
-                                      message:, base_revision_id:)
+      description_page = description && (
+          tag&.id == description.tag_id ||
+          (tag.nil? && !old_title.include?(':')))
+      if description && !description_page
+        Wiki::Commit.legacy_content!(page:, body:, created_user: current_user,
+                                     message:, base_revision_id:)
+      else
+        Wiki::Commit.content!(page:, body:, created_user: current_user,
+                              message:, base_revision_id:)
+      end
 
-      if title != old_title
+      if tag && title != old_title
         tag.reload
         TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
       end
@@ -236,7 +273,23 @@ class WikiPagesController < ApplicationController
       return render json: tag_group_changes(TagGroupVersion.where(tag_group_id: tag_group.id))
     end
 
-    json = []
+    pages = id ? WikiPage.where(id:) : unmigrated_wiki_pages
+    revisions = WikiRevision.joins(wiki_page: :tag_name)
+        .where(wiki_page_id: pages.select(:id))
+        .includes(:created_user, wiki_page: { tag_name: :tag })
+        .order(id: :desc).limit(200)
+    json = revisions.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 }
+    }
     unless id
       json.concat(tag_group_changes(TagGroupVersion.all))
       json.concat(description_changes(TagDescription.where(language_code: 'ja')))
@@ -249,6 +302,26 @@ class WikiPagesController < ApplicationController
 
   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])
@@ -278,7 +351,6 @@ class WikiPagesController < ApplicationController
     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,
@@ -335,6 +407,27 @@ class WikiPagesController < ApplicationController
     end
   end
 
+  def render_wiki_page_or_404 page
+    return head :not_found unless page
+
+    rev = find_revision(page)
+    return head :not_found unless rev
+
+    if rev.redirect?
+      return (
+          redirect_to wiki_page_by_title_path(title: rev.redirect_page.title),
+                      status: :moved_permanently)
+    end
+
+    body = rev.body
+    revision_id = rev.id
+    pred = page.pred_revision_id(revision_id)
+    succ = page.succ_revision_id(revision_id)
+    updated_at = rev.created_at
+
+    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?
@@ -360,6 +453,16 @@ class WikiPagesController < ApplicationController
         .find_by(language_code: 'ja', tag_names: { language_code: 'ja', name: title })
   end
 
+  def unmigrated_wiki_pages
+    descriptions = TagDescription.where(language_code: 'ja')
+
+    WikiPage
+        .joins(:tag_name)
+        .where.not('tag_names.name LIKE ?', "#{ TagGroupRepr::PREFIX }%")
+        .where('tag_names.tag_id IS NULL OR tag_names.tag_id NOT IN (?)',
+               descriptions.select(:tag_id))
+  end
+
   def description_changes descriptions
     versions = TagDescriptionVersion.where(language_code: 'ja',
                                            tag_id: descriptions.select(:tag_id))
@@ -389,6 +492,14 @@ class WikiPagesController < ApplicationController
     end
   end
 
+  def find_revision page
+    if params[:version].present?
+      page.wiki_revisions.find_by(id: params[:version])
+    else
+      page.current_revision
+    end
+  end
+
   def render_wiki_conflict err
     render json: { error: 'conflict', message: err.message }, status: :conflict
   end

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/locale.rb

@@ -13,13 +13,14 @@ class Locale < ApplicationRecord
   def generate_tag_names!
     ApplicationRecord.transaction do
       tag_ids = TagName.where(language_code:, primary_flg: true).pluck(:tag_id)
-      Tag.where.not(id: tag_ids).includes(:tag_names).find_each do
+      Tag.where.not(id: tag_ids).find_each do
         TagName.create!(tag_id: _1.id,
                         language_code:,
                         name: TagName.generate_name(self, _1, _1.tag_name('ja')),
                         script_code:,
                         primary_flg: true,
-                        auto_generated: true)
+                        auto_generated: true,
+                        canonical_id: nil)
       end
     end
   end

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
 
@@ -91,6 +88,7 @@ class Tag < ApplicationRecord
     end
   end
   def name(language_code) = tag_name(language_code)&.name
+  def wiki_page = tag_name('ja')&.wiki_page
 
   def system?
     tag_name('ja')&.name.in?(SYSTEM_TAG_NAMES)
@@ -98,13 +96,7 @@ class Tag < ApplicationRecord
 
   def deprecated? = deprecated_at?
 
-  def has_description? language_code:
+  def has_wiki = wiki_page.present?
-    if tag_descriptions.loaded?
-      tag_descriptions.any? { _1.language_code == language_code }
-    else
-      tag_descriptions.exists?(language_code:)
-    end
-  end
 
   def material_id = materials.first&.id
 
@@ -259,13 +251,16 @@ class Tag < ApplicationRecord
       name = name.to_s.strip
 
       ApplicationRecord.transaction do
-        tn = TagName.find_by(language_code:, name:)
+        tn = TagName.find_or_create_by!(language_code:, name:) do
-        next tn.tag if tn
+          _1.script_code = locale.script_code
+          _1.primary_flg = true
+        end
 
-        tag = Tag.create!(category:)
+        tag = tn.tag
-        tn = TagName.create!(tag:, language_code:, name:,
+        next tag if tag
-                             script_code: locale.script_code, primary_flg: true,
+
-                             auto_generated: false)
+        tag = Tag.create!(tag_name_id: tn.id, category:)
+        tn.update!(tag:, primary_flg: true, canonical_id: nil, auto_generated: false)
         generate_tag_names!(locale, tag, tn)
         tag.association(:tag_names).reset
 
@@ -299,17 +294,20 @@ class Tag < ApplicationRecord
             end
           end
 
-          if source_tag.tag_descriptions.exists?
+          source_tag_name = source_tag.tag_name('ja')
-            source_tag.errors.add(:base, :invalid)
+
-            raise ActiveRecord::RecordInvalid, source_tag
+          if source_tag_name.wiki_page.present?
+            raise ActiveRecord::RecordInvalid.new(source_tag_name)
           end
 
           TagVersioning.record!(source_tag, event_type: :discard, created_by_user:)
           source_tag.tag_names.update_all(tag_id: target_tag.id, primary_flg: false,
-                                          auto_generated: false,
                                           updated_at: Time.current)
           source_tag.destroy!
 
+          source_tag_name.update_columns(canonical_id: target_tag.tag_name_id,
+                                         updated_at: Time.current)
+
           TagVersioning.record!(target_tag, event_type: :update, created_by_user:)
         end
 
@@ -369,7 +367,8 @@ class Tag < ApplicationRecord
                           name: TagName.generate_name(locale, tag, base_tag_name),
                           script_code:,
                           primary_flg: true,
-                          auto_generated: true)
+                          auto_generated: true,
+                          canonical_id: nil)
         end
       end
     end

backend/app/models/tag_description.rb

@@ -1,5 +1,3 @@
 class TagDescription < ApplicationRecord
-  before_create { SharedResourceIdAllocator.assign!(self) }
-
   belongs_to :tag
 end

backend/app/models/tag_group.rb

@@ -1,6 +1,4 @@
 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
 

backend/app/models/tag_name.rb

@@ -1,12 +1,14 @@
 class TagName < ApplicationRecord
   belongs_to :language, foreign_key: :language_code, primary_key: :code
-  belongs_to :tag
+  belongs_to :tag, optional: true
+  has_one :wiki_page
 
   validates :name, presence: true,
                    length: { maximum: 255 },
                    uniqueness: { scope: :language_code }
 
   validate :alias_name_must_not_have_prefix
+  validate :alias_must_not_have_wiki_page
   validate :name_must_be_sanitised
   validate :name_mustnt_start_with_nico
   validate :generated_name_must_be_reserved
@@ -19,16 +21,14 @@ class TagName < ApplicationRecord
 
     tns = TagName.where(language_code: locale.language_code, name: names).index_by(&:name)
 
-    primary_names = TagName.where(
-        language_code: locale.language_code, tag_id: tns.values.map(&:tag_id),
-        primary_flg: true).pluck(:tag_id, :name).to_h
-
     names.map { |name|
       tag_name = tns[name]
-      if !tag_name || tag_name.primary?
+      if !tag_name || tag_name.primary? || tag_name.tag_id.nil?
         name
       else
-        primary_names[tag_name.tag_id] || name
+        TagName.find_by(language_code: locale.language_code,
+                        tag_id: tag_name.tag_id,
+                        primary_flg: true)&.name || name
       end
     }.uniq
   end
@@ -53,6 +53,12 @@ class TagName < ApplicationRecord
     end
   end
 
+  def alias_must_not_have_wiki_page
+    if !(primary?) && wiki_page
+      errors.add :primary_flg, 'Wiki 参照がある名前はエーリアスになれません．'
+    end
+  end
+
   def name_must_be_sanitised
     if name? && name != TagNameSanitisationRule.sanitise(name)
       errors.add :name, '名前に使用できない文字が含まれてゐます．'

backend/app/models/tag_name_sanitisation_rule.rb

@@ -33,7 +33,13 @@ class TagNameSanitisationRule < ApplicationRecord
               existing_tag = existing_tn.tag
               source_tag = tn.tag
 
-              Tag.merge_tags!(existing_tag, source_tag) if existing_tag != source_tag
+              if existing_tag
+                Tag.merge_tags!(existing_tag, source_tag) if tn.tag
+              elsif source_tag
+                tn.update_columns(tag_id: nil, updated_at: Time.current)
+                source_tag.update_columns(tag_name_id: existing_tn.id, updated_at: Time.current)
+                existing_tn.update_columns(tag_id: source_tag.id, updated_at: Time.current)
+              end
               tn.destroy!
 
               next

backend/app/models/user.rb

@@ -13,10 +13,10 @@ class User < ApplicationRecord
   has_many :ip_addresses, through: :user_ips
   has_many :user_post_views, dependent: :destroy
   has_many :viewed_posts, through: :user_post_views, source: :post
-  has_many :created_tag_descriptions, class_name: 'TagDescription',
+  has_many :created_wiki_pages,
-           foreign_key: :created_by_user_id, dependent: :nullify
+           class_name: 'WikiPage', foreign_key: :created_user_id, dependent: :nullify
-  has_many :updated_tag_descriptions, class_name: 'TagDescription',
+  has_many :updated_wiki_pages,
-           foreign_key: :updated_by_user_id, dependent: :nullify
+           class_name: 'WikiPage', foreign_key: :updated_user_id, dependent: :nullify
 
   def viewed?(post) = user_post_views.exists?(post_id: post.id)
 

backend/app/models/wiki_line.rb

@@ -0,0 +1,15 @@
+class WikiLine < ApplicationRecord
+  has_many :wiki_revision_lines, dependent: :restrict_with_exception
+
+  validates :sha256, presence: true, uniqueness: true, length: { is: 64 }
+  validates :body, presence: true
+
+  def self.upsert_by_body! body
+    sha = Digest::SHA256.hexdigest(body)
+    now = Time.current
+
+    upsert(sha256: sha, body:, created_at: now, updated_at: now)
+
+    find_by!(sha256: sha)
+  end
+end

backend/app/models/wiki_page.rb

@@ -0,0 +1,58 @@
+require 'set'
+
+
+class WikiPage < ApplicationRecord
+  include MyDiscard
+
+  has_many :wiki_revisions, dependent: :destroy
+  belongs_to :created_user, class_name: 'User'
+  belongs_to :updated_user, class_name: 'User'
+
+  has_many :redirected_from_revisions,
+           class_name: 'WikiRevision',
+           foreign_key: :redirect_page_id,
+           dependent: :nullify
+
+  has_many :wiki_versions
+
+  attribute :version_no, :integer, default: 1
+
+  belongs_to :tag_name
+  validates :tag_name, presence: true
+  validates :body, presence: true
+
+  def title = tag_name.name
+  def deprecated_at = tag_name.tag&.deprecated_at
+
+  def title= val
+    (self.tag_name ||= build_tag_name).name = val
+  end
+
+  def current_revision = wiki_revisions.order(id: :desc).first
+
+  def resolve_redirect limit: 10
+    page = self
+    visited = Set.new
+
+    limit.times do
+      return page if visited.include?(page.id)
+
+      visited.add(page.id)
+
+      rev = page.current_revision
+      return page if !(rev&.redirect?) || !(rev.redirect_page)
+
+      page = rev.redirect_page
+    end
+
+    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
+end

backend/app/models/wiki_revision.rb

@@ -0,0 +1,55 @@
+class WikiRevision < ApplicationRecord
+  belongs_to :wiki_page
+  belongs_to :base_revision, class_name: 'WikiRevision', optional: true
+  belongs_to :created_user, class_name: 'User'
+  belongs_to :redirect_page, class_name: 'WikiPage', optional: true
+
+  has_many :wiki_revision_lines, dependent: :delete_all
+  has_many :wiki_lines, through: :wiki_revision_lines
+
+  enum :kind, content: 0, redirect: 1
+
+  validates :kind, presence: true
+  validates :lines_count, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
+  validates :tree_sha256, length: { is: 64 }, allow_nil: true
+
+  validate :kind_consistency
+
+  def body
+    return unless content?
+
+    wiki_revision_lines
+        .includes(:wiki_line)
+        .order(:position)
+        .map { |rev| rev.wiki_line.body }
+        .join("\n")
+  end
+
+  private
+
+  def kind_consistency
+    if content?
+      if tree_sha256.blank?
+        errors.add(:tree_sha256, '種類がページの場合は必須です．') 
+      end
+
+      if redirect_page_id.present?
+        errors.add(:redirect_page_id, '種類がページの場合は空である必要があります．')
+      end
+    end
+
+    if redirect?
+      if redirect_page_id.blank?
+        errors.add(:redirect_page_id, '種類がリダイレクトの場合は必須です．')
+      end
+
+      if tree_sha256.present?
+        errors.add(:tree_sha256, '種類がリダイレクトの場合は空である必要があります．')
+      end
+
+      if lines_count.to_i > 0
+        errors.add(:lines_count, '種類がリダイレクトの場合は 0 である必要があります．')
+      end
+    end
+  end
+end

backend/app/models/wiki_revision_line.rb

@@ -0,0 +1,8 @@
+class WikiRevisionLine < ApplicationRecord
+  belongs_to :wiki_revision
+  belongs_to :wiki_line
+
+  validates :position, presence: true,
+                       numericality: { only_integer: true, greater_than_or_equal_to: 0 }
+  validates :position, uniqueness: { scope: :wiki_revision_id }
+end

backend/app/models/wiki_version.rb

@@ -0,0 +1,8 @@
+class WikiVersion < ApplicationRecord
+  include VersionRecord
+
+  belongs_to :wiki_page
+
+  validates :title, presence: true
+  validates :body, presence: true
+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:),
+    tag.as_json(BASE).merge(name: name_for(tag, language_code),
-                            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:),
+    tag.as_json(BASE).merge(name: name_for(tag, language_code), aliases: [], parents: [])
-                            name: name_for(tag, language_code), aliases: [], parents: [])
   end
 
-  def many tags, language_code: 'ja'
+  def many(tags, language_code: 'ja') = tags.map { |tag| base(tag, language_code:) }
-    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 name_for tag, language_code
     tag.name(language_code) || (tag.system? ? tag.name('ja') : nil)

backend/app/representations/wiki_page_repr.rb

@@ -2,12 +2,17 @@
 
 
 module WikiPageRepr
+  BASE = { methods: [:title, :deprecated_at] }.freeze
+
   module_function
 
+  def base wiki_page
+    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,
@@ -21,6 +26,10 @@ module WikiPageRepr
   end
 
   def tag_group tag_group
-    TagGroupRepr.tag_group(tag_group).merge('resource_type' => 'tag_group')
+    TagGroupRepr.tag_group(tag_group)
+  end
+
+  def many wiki_pages
+    wiki_pages.map { |p| base(p) }
   end
 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

@@ -1,20 +1,18 @@
 class TagDescriptionOperation
   LANGUAGE_CODE = 'ja'
 
-  class Conflict < StandardError
-    ;
-  end
-
   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)
 
-      description = TagDescription.new(tag:, language_code: LANGUAGE_CODE)
+      page = Wiki::CompatibilityWriter.create!(
-      body = normalise_body!(description, body)
+          tag_name: tag.tag_name(LANGUAGE_CODE), body:, created_by_user:, message:)
-      record_version!(description:, body:, user: created_by_user)
+      revision = page.wiki_revisions.order(id: :desc).first
-      description
+      record_version!(tag:, revision:, body:, user: created_by_user,
+                      description: nil)
+      page
     end
   end
 
@@ -24,47 +22,33 @@ class TagDescriptionOperation
       tag.lock!
       description = TagDescription.lock.find_by!(
           tag_id: tag.id, language_code: LANGUAGE_CODE)
-      body = normalise_body!(description, body)
+      page = WikiPage.lock.find(description.id)
-      latest = TagDescriptionVersion.find_by(
+      revision = Wiki::CompatibilityWriter.update!(
-          tag_id: tag.id, language_code: LANGUAGE_CODE,
+          page:, body:, updated_by_user:, message:,
-          version_no: description.version_no)
+          base_revision_id:)
-      if base_revision_id.present? && latest&.id != base_revision_id.to_i
+      next unless revision
-        raise Conflict, '競合が発生してゐます．'
-      end
-      next if latest && normalise_body(description.body) == body
 
-      record_version!(description:, body:, user: updated_by_user)
+      record_version!(tag:, revision:, body: revision.body,
+                      user: updated_by_user, description:)
+      revision
     end
   end
 
-  def self.record_version! description:, body:, user:
+  def self.record_version! tag:, revision:, body:, user:, description:
-    creating = description.new_record?
+    version_no = description ? description.version_no + 1 : 1
-    version_no = creating ? 1 : description.version_no + 1
+    TagDescriptionVersion.create!(
-    version = TagDescriptionVersion.create!(
+        id: revision.id, tag_id: tag.id, language_code: LANGUAGE_CODE,
-        tag_id: description.tag_id, language_code: description.language_code,
+        version_no:, event_type: description ? 'update' : 'create', body:,
-        version_no:, event_type: creating ? 'create' : 'update', body:,
+        created_by_user_id: user.id, created_at: revision.created_at)
-        source_language_code: description.source_language_code,
+    if description
-        source_version_no: description.source_version_no,
+      description.update!(body:, version_no:, updated_by_user_id: user.id)
-        created_by_user_id: user.id, created_at: Time.current)
+    else
-    description.created_by_user_id = user.id if creating
+      TagDescription.create!(
-    description.update!(body:, version_no:, updated_by_user_id: user.id)
+          id: revision.wiki_page_id, tag_id: tag.id,
-    version
+          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!
-
-  def self.normalise_body body
-    body.to_s.gsub(/\r\n?/, "\n")
-        .encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
-        .sub(/\n+\z/, '')
-  end
-  private_class_method :normalise_body
-
-  def self.normalise_body! description, body
-    normalised = normalise_body(body)
-    return normalised if normalised.present?
-
-    description.errors.add(:body, :blank)
-    raise ActiveRecord::RecordInvalid, description
-  end
-  private_class_method :normalise_body!
 end

backend/app/services/tag_group_operation.rb

@@ -1,8 +1,10 @@
 class TagGroupOperation
   MAX_PLACEMENT_DEPTH = 5
+  PREFIX = TagGroupRepr::PREFIX
 
-  def self.create!(name:, description:, members:, placements:, actor:)
+  def self.create!(name:, description:, members:, placements:, actor:,
-    ApplicationRecord.transaction do
+                   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:)
@@ -11,15 +13,21 @@ class TagGroupOperation
       group.save!
       persist_structure!(group:, attributes:, actor:)
       persist_version!(group:, attributes:, actor:, event_type: 'create')
-      group
+      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:)
+  def self.update!(group:, name:, description:, members:, placements:, actor:,
-    ApplicationRecord.transaction do
+                   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 if unchanged?(group, attributes)
+      next [group, nil] if unchanged?(group, attributes)
 
       group.update!(name: attributes.fetch(:name),
                     description: attributes.fetch(:description),
@@ -27,8 +35,12 @@ class TagGroupOperation
                     updated_by_user: actor)
       persist_structure!(group:, attributes:, actor:)
       persist_version!(group:, attributes:, actor:, event_type: 'update')
-      group
+      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:)
@@ -301,6 +313,57 @@ class TagGroupOperation
   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::Commit.create_legacy_content!(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')

backend/app/services/wiki/commit.rb

@@ -0,0 +1,160 @@
+require 'digest'
+
+
+module Wiki
+  class Commit
+    class Conflict < StandardError
+      ;
+    end
+
+    def self.create_content! tag_name:, body:, created_by_user:, message: nil
+      if tag_name.tag && tag_name.language_code == 'ja'
+        return TagDescriptionOperation.create!(
+            tag: tag_name.tag, body:, created_by_user:, message:)
+      end
+
+      create_legacy_content!(tag_name:, body:, created_by_user:, message:)
+    end
+
+    def self.create_legacy_content! tag_name:, body:, created_by_user:, message: nil
+      normalised = normalise_body(body)
+
+      page = WikiPage.new(tag_name:,
+                          body: normalised,
+                          created_user: created_by_user,
+                          updated_user: created_by_user)
+
+      if normalised.blank?
+        page.errors.add(:body, :blank)
+        raise ActiveRecord::RecordInvalid, page
+      end
+
+      ActiveRecord::Base.transaction do
+        page.save!
+
+        new(page:, created_user: created_by_user).content!(
+            body: normalised,
+            message:,
+            base_revision_id: nil)
+
+        page
+      end
+    end
+
+    def self.content! page:, body:, created_user:, message: nil, base_revision_id: nil
+      description = TagDescription.find_by(id: page.id)
+      if description
+        return TagDescriptionOperation.update!(
+            tag: description.tag, body:, updated_by_user: created_user,
+            message:, base_revision_id:)
+      end
+
+      legacy_content!(page:, body:, created_user:, message:, base_revision_id:)
+    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
+
+    def self.redirect! page:, redirect_page:, created_user:, message: nil, base_revision_id: nil
+      new(page:, created_user:).redirect!(redirect_page:, message:, base_revision_id:)
+    end
+
+    def initialize page:, created_user:
+      @page = page
+      @created_user = created_user
+    end
+
+    def content! body:, message:, base_revision_id:
+      normalised = self.class.normalise_body(body)
+      if normalised.blank?
+        @page.errors.add(:body, :blank)
+        raise ActiveRecord::RecordInvalid, @page
+      end
+
+      lines = split_lines(normalised)
+
+      line_shas = lines.map { |line| Digest::SHA256.hexdigest(line) }
+      tree_sha = Digest::SHA256.hexdigest(line_shas.join(','))
+
+      ActiveRecord::Base.transaction do
+        @page.lock!
+
+        if base_revision_id.present?
+          current_id = @page.wiki_revisions.maximum(:id)
+          if current_id && current_id != base_revision_id.to_i
+            raise 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
+
+        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!(
+            page: @page,
+            event_type: @page.wiki_versions.exists? ? :update : :create,
+            reason: message,
+            created_by_user: @created_user)
+
+        rev = WikiRevision.create!(
+            wiki_page:        @page,
+            base_revision_id:,
+            created_user:     @created_user,
+            kind:             :content,
+            redirect_page_id: nil,
+            message:,
+            lines_count:      lines.length,
+            tree_sha256:      tree_sha)
+
+        rows = line_ids.each_with_index.map do |line_id, pos|
+          { wiki_revision_id: rev.id, wiki_line_id: line_id, position: pos }
+        end
+        WikiRevisionLine.insert_all!(rows) if rows.any?
+        rev
+      end
+    end
+
+    def redirect!(redirect_page:, message:, base_revision_id:) = raise '廃止しました．'
+
+    def self.normalise_body body
+      s = body.to_s
+      s.gsub!(/\r\n?/, "\n")
+      s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
+      s.gsub(/\n+$/, '')
+    end
+
+    private
+
+    def split_lines(body) = body.split("\n")
+
+    def upsert_lines! lines, line_shas
+      now = Time.current
+
+      id_by_sha = WikiLine.where(sha256: line_shas).pluck(:sha256, :id).to_h
+
+      missing_by_sha = { }
+
+      line_shas.each_with_index do |sha, i|
+        next if id_by_sha.key?(sha)
+        next if missing_by_sha.key?(sha)
+
+        missing_by_sha[sha] = {
+            sha256:     sha,
+            body:       lines[i],
+            created_at: now,
+            updated_at: now }
+      end
+
+      if missing_by_sha.any?
+        WikiLine.upsert_all(missing_by_sha.values)
+        id_by_sha = WikiLine.where(sha256: line_shas).pluck(:sha256, :id).to_h
+      end
+
+      id_by_sha
+    end
+  end
+end

backend/app/services/wiki/compatibility_writer.rb

@@ -0,0 +1,33 @@
+module Wiki
+  class CompatibilityWriter
+    def self.create! tag_name:, body:, created_by_user:, message: nil
+      Commit.create_legacy_content!(
+          tag_name:, body:, created_by_user:, message:)
+    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
+
+      return if Commit.normalise_body(page.body) == normalised
+
+      Commit.legacy_content!(
+          page:, body: normalised, created_user: updated_by_user, message:,
+          base_revision_id:)
+    end
+  end
+end

backend/app/services/wiki_version_recorder.rb

@@ -0,0 +1,21 @@
+class WikiVersionRecorder < VersionRecorder
+  def self.record! page:, event_type:, reason: nil, created_by_user:
+    new(page:, event_type:, reason:, created_by_user:).record!
+  end
+
+  def initialize page:, event_type:, reason: nil, created_by_user:
+    @reason = reason
+    super(record: page, event_type:, created_by_user:)
+  end
+
+  private
+
+  def version_class = WikiVersion
+  def version_association = :wiki_versions
+  def record_key = :wiki_page
+
+  def snapshot_attributes = {
+      title: @record.title,
+      body: @record.body,
+      reason: @reason }
+end

backend/db/migrate/20261015000000_drop_wiki_pages.rb

@@ -1,9 +0,0 @@
-class DropWikiPages < ActiveRecord::Migration[8.0]
-  def change
-    drop_table :wiki_versions
-    drop_table :wiki_revision_lines
-    drop_table :wiki_lines
-    drop_table :wiki_revisions
-    drop_table :wiki_pages
-  end
-end

backend/db/migrate/20261015003000_remove_tag_name_id_from_tags.rb

@@ -1,11 +0,0 @@
-class RemoveTagNameIdFromTags < ActiveRecord::Migration[8.0]
-  def up
-    remove_foreign_key :tags, column: :tag_name_id
-    remove_foreign_key :tag_names, column: :canonical_id
-
-    remove_column :tags, :tag_name_id
-    remove_column :tag_names, :canonical_id
-  end
-
-  def down = raise ActiveRecord::IrreversibleMigration, '戻せません．'
-end

backend/db/migrate/20261015010000_delete_name_for_wiki_from_tag_names.rb

@@ -1,15 +0,0 @@
-class DeleteNameForWikiFromTagNames < ActiveRecord::Migration[8.0]
-  def up
-    execute <<~SQL
-      DELETE
-      FROM
-        tag_names
-      WHERE
-        tag_id IS NULL
-    SQL
-
-    change_column_null :tag_names, :tag_id, false
-  end
-
-  def down = raise ActiveRecord::IrreversibleMigration, '戻せません．'
-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_15_010000) do
+ActiveRecord::Schema[8.0].define(version: 2026_10_08_010000) 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
@@ -578,15 +578,17 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_15_010000) do
   end
 
   create_table "tag_names", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
+    t.bigint "tag_id"
     t.string "language_code", limit: 16, null: false
     t.string "name", null: false
     t.string "script_code", limit: 4, null: false
     t.boolean "primary_flg", null: false
     t.boolean "auto_generated", default: false, null: false
+    t.bigint "canonical_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.virtual "primary_tag_id", type: :bigint, as: "(case when `primary_flg` then `tag_id` else NULL end)"
+    t.index ["canonical_id"], name: "index_tag_names_on_canonical_id"
     t.index ["language_code", "name"], name: "index_tag_names_on_language_code_and_name", unique: true
     t.index ["primary_tag_id", "language_code"], name: "index_tag_names_on_primary_tag_id_and_language_code", unique: true
     t.index ["script_code"], name: "fk_rails_dd783b3d1c"
@@ -623,6 +625,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_15_010000) do
   end
 
   create_table "tags", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "tag_name_id", null: false
     t.string "category", default: "general", null: false
     t.datetime "deprecated_at"
     t.datetime "created_at", null: false
@@ -630,6 +633,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_15_010000) do
     t.integer "post_count", default: 0, null: false
     t.integer "version_no", null: false
     t.index ["deprecated_at"], name: "index_tags_on_deprecated_at"
+    t.index ["tag_name_id"], name: "index_tags_on_tag_name_id", unique: true
     t.check_constraint "(`deprecated_at` is null) or (`category` <> _utf8mb4'nico')", name: "chk_tags_deprecated_at_not_nico"
     t.check_constraint "`version_no` > 0", name: "chk_tags_version_no_positive"
   end
@@ -769,6 +773,76 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_15_010000) do
     t.index ["banned_at"], name: "index_users_on_banned_at"
   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
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["sha256"], name: "index_wiki_lines_on_sha256", unique: true
+  end
+
+  create_table "wiki_pages", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "tag_name_id", null: false
+    t.text "body", null: false
+    t.bigint "created_user_id", null: false
+    t.bigint "updated_user_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.datetime "discarded_at"
+    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"
+    t.index ["tag_name_id"], name: "index_wiki_pages_on_tag_name_id", unique: true
+    t.index ["updated_user_id"], name: "index_wiki_pages_on_updated_user_id"
+    t.check_constraint "`version_no` > 0", name: "chk_wiki_pages_version_no_positive"
+  end
+
+  create_table "wiki_revision_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "wiki_revision_id", null: false
+    t.integer "position", null: false
+    t.bigint "wiki_line_id", null: false
+    t.index ["wiki_line_id"], name: "index_wiki_revision_lines_on_wiki_line_id"
+    t.index ["wiki_revision_id", "position"], name: "index_wiki_revision_lines_on_wiki_revision_id_and_position", unique: true
+    t.index ["wiki_revision_id", "wiki_line_id"], name: "index_wiki_revision_lines_on_wiki_revision_id_and_wiki_line_id"
+    t.index ["wiki_revision_id"], name: "index_wiki_revision_lines_on_wiki_revision_id"
+  end
+
+  create_table "wiki_revisions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "wiki_page_id", null: false
+    t.bigint "base_revision_id"
+    t.bigint "created_user_id", null: false
+    t.integer "kind", default: 0, null: false
+    t.bigint "redirect_page_id"
+    t.string "message"
+    t.integer "lines_count", default: 0, null: false
+    t.string "tree_sha256", limit: 64
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["base_revision_id"], name: "index_wiki_revisions_on_base_revision_id"
+    t.index ["created_user_id"], name: "index_wiki_revisions_on_created_user_id"
+    t.index ["kind"], name: "index_wiki_revisions_on_kind"
+    t.index ["redirect_page_id"], name: "index_wiki_revisions_on_redirect_page_id"
+    t.index ["tree_sha256"], name: "index_wiki_revisions_on_tree_sha256"
+    t.index ["wiki_page_id", "id"], name: "index_wiki_revisions_on_wiki_page_id_and_id"
+    t.index ["wiki_page_id"], name: "index_wiki_revisions_on_wiki_page_id"
+  end
+
+  create_table "wiki_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "wiki_page_id", null: false
+    t.integer "version_no", null: false
+    t.string "event_type", null: false
+    t.string "title", null: false
+    t.text "body", null: false
+    t.text "reason"
+    t.datetime "created_at", null: false
+    t.bigint "created_by_user_id"
+    t.index ["created_by_user_id"], name: "index_wiki_versions_on_created_by_user_id"
+    t.index ["wiki_page_id", "version_no"], name: "index_wiki_versions_on_wiki_page_id_and_version_no", unique: true
+    t.index ["wiki_page_id"], name: "index_wiki_versions_on_wiki_page_id"
+    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "wiki_versions_event_type_valid"
+    t.check_constraint "`version_no` > 0", name: "wiki_versions_version_no_positive"
+  end
+
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "gekanator_ai_runs", "gekanator_question_suggestions"
@@ -841,10 +915,12 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_15_010000) do
   add_foreign_key "tag_implications", "tags", column: "parent_tag_id"
   add_foreign_key "tag_names", "languages", column: "language_code", primary_key: "code"
   add_foreign_key "tag_names", "scripts", column: "script_code", primary_key: "code"
+  add_foreign_key "tag_names", "tag_names", column: "canonical_id"
   add_foreign_key "tag_names", "tags"
   add_foreign_key "tag_similarities", "tags"
   add_foreign_key "tag_similarities", "tags", column: "target_tag_id"
   add_foreign_key "tag_versions", "users", column: "created_by_user_id"
+  add_foreign_key "tags", "tag_names"
   add_foreign_key "theatre_comments", "theatres"
   add_foreign_key "theatre_comments", "users"
   add_foreign_key "theatre_programmes", "posts"
@@ -869,4 +945,15 @@ ActiveRecord::Schema[8.0].define(version: 2026_10_15_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_pages", "tag_names"
+  add_foreign_key "wiki_pages", "users", column: "created_user_id"
+  add_foreign_key "wiki_pages", "users", column: "updated_user_id"
+  add_foreign_key "wiki_revision_lines", "wiki_lines"
+  add_foreign_key "wiki_revision_lines", "wiki_revisions"
+  add_foreign_key "wiki_revisions", "users", column: "created_user_id"
+  add_foreign_key "wiki_revisions", "wiki_pages"
+  add_foreign_key "wiki_revisions", "wiki_pages", column: "redirect_page_id"
+  add_foreign_key "wiki_revisions", "wiki_revisions", column: "base_revision_id"
+  add_foreign_key "wiki_versions", "users", column: "created_by_user_id"
+  add_foreign_key "wiki_versions", "wiki_pages"
 end

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/spec/db/tag_description_migration_spec.rb

@@ -5,11 +5,11 @@ 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!(
+    page = Wiki::Commit.create_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!(
+      revisions << Wiki::Commit.content!(
           page:, body:, created_user: user, base_revision_id: revisions.last.id)
     end
     tag = create(:tag, primary_tag_name: tag_name)

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

@@ -1,17 +1,16 @@
 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(
+    Wiki::Commit.create_content!(
         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)
+    second = Wiki::Commit.content!(page:, body: 'old-second', created_user: user)
-    third = Wiki::Commit.legacy_content!(page:, body: 'old-third', created_user: user)
+    third = Wiki::Commit.content!(page:, body: 'old-third', created_user: user)
     [first, second, third]
   end
   let!(:tag) { create(:tag, primary_tag_name: tag_name) }
@@ -243,8 +242,8 @@ RSpec.describe 'Tag description Wiki compatibility', type: :request do
   end
 
   describe 'mixed changes' do
-    it 'excludes unmigrated history and migrated legacy-only revisions' do
+    it 'includes unmigrated history and ignores migrated legacy-only revisions' do
-      legacy_page = seed_wiki_page(
+      legacy_page = Wiki::Commit.create_content!(
           tag_name: create(:tag_name, name: 'Help_mixed'),
           body: 'help', created_by_user: user)
       legacy_revision = legacy_page.current_revision
@@ -257,7 +256,7 @@ RSpec.describe 'Tag description Wiki compatibility', type: :request do
       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(
+      expect(json).to include(include(
           'revision_id' => legacy_revision.id,
           'wiki_page' => include('id' => legacy_page.id, 'title' => 'Help_mixed')))
     end

backend/spec/requests/tag_description_wiki_write_spec.rb

@@ -1,7 +1,6 @@
 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) }
@@ -32,7 +31,7 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request do
            headers: headers
     end
 
-    it 'creates a description with matching Wiki content and histories' do
+    it 'creates both current records and histories with a shared revision ID' do
       expect { create_description }
           .to change(WikiPage, :count).by(1)
           .and change(WikiRevision, :count).by(1)
@@ -40,28 +39,17 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request do
           .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 = WikiPage.find(json.fetch('id'))
-      page = Wiki::Commit.create_legacy_content!(
+      description = TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
-          tag_name:, body: 'legacy', created_by_user: user)
+      version = TagDescriptionVersion.find_by!(tag_id: tag.id, language_code: 'ja')
-      expect { create_description }
+      expect(description).to have_attributes(id: page.id, body: 'initial', version_no: 1)
-          .to change(WikiPage, :count).by(0)
+      expect(version).to have_attributes(
-          .and change(WikiRevision, :count).by(1)
+          id: page.current_revision.id, body: 'initial', version_no: 1,
-          .and change(WikiVersion, :count).by(1)
+          event_type: 'create', created_by_user_id: user.id)
-      expect(response).to have_http_status(:created)
+      expect(page.body).to eq(description.body)
-      description = TagDescription.find_by!(tag_id: tag.id)
+      expect(page.current_revision.body).to eq(version.body)
-      expect(page.reload.body).to eq(description.body)
+      expect(page.wiki_versions.last.body).to eq(version.body)
-      expect(TagDescriptionVersion.find(page.current_revision.id).body).to eq(page.body)
     end
 
     ['missing_description', 'orphan_description'].each do |title|
@@ -77,19 +65,48 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request do
       end
     end
 
-    [false, true].each do |linked|
+    it 'creates a namespaced legacy Wiki resource without a Tag' do
-      it "rejects namespaced creation with Tag present: #{ linked }" do
+      expect do
-        name = create(:tag_name, name: 'Help:frozen')
+        post '/wiki', params: { title: 'Help:description_write', body: 'legacy' },
-        create(:tag, primary_tag_name: name) if linked
+             headers: headers
-        before_state = stored_state
+      end.to change(WikiPage, :count).by(1)
-        post '/wiki', params: { title: name.name, body: 'legacy' }, headers: headers
+          .and change(WikiRevision, :count).by(1)
-        expect(response.status).to be_between(400, 499)
+          .and change(WikiVersion, :count).by(1)
-        expect(stored_state).to eq(before_state)
+          .and change(TagDescription, :count).by(0)
-      end
+          .and change(TagDescriptionVersion, :count).by(0)
+
+      expect(response).to have_http_status(:created)
+      page = WikiPage.find(json.fetch('id'))
+      expect(page.tag_name.tag).to be_nil
+      expect(page.body).to eq('legacy')
+      expect(page.current_revision.body).to eq('legacy')
+    end
+
+    it 'creates only legacy Wiki for a namespaced title with an existing Tag' do
+      namespaced_name = create(:tag_name, name: 'help:foo')
+      namespaced_tag = create(:tag, primary_tag_name: namespaced_name)
+
+      expect do
+        post '/wiki', params: { title: namespaced_name.name, body: 'legacy' },
+             headers: headers
+      end.to change(WikiPage, :count).by(1)
+          .and change(WikiRevision, :count).by(1)
+          .and change(WikiVersion, :count).by(1)
+          .and change(TagName, :count).by(0)
+          .and change(TagDescription, :count).by(0)
+          .and change(TagDescriptionVersion, :count).by(0)
+
+      expect(response).to have_http_status(:created)
+      page = WikiPage.find(json.fetch('id'))
+      expect(page).to have_attributes(tag_name_id: namespaced_name.id, body: 'legacy')
+      expect(page.tag_name.tag).to eq(namespaced_tag)
+      expect(page.current_revision.body).to eq('legacy')
+      expect(page.wiki_versions.last.body).to eq('legacy')
     end
 
     [WikiPage, WikiRevision, WikiVersion, TagDescription, TagDescriptionVersion].each do |model|
-      it "rolls back new description creation when #{ model.name } persistence fails" do
+      it "rolls back both systems when #{ model.name } persistence fails" do
+        tag_name
         before_state = stored_state
         aggregate_failures do
           fail_save(model) { create_description }
@@ -99,32 +116,10 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request do
     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(
+      Wiki::Commit.create_content!(
           tag_name:, body: 'before', created_by_user: user)
     end
     let!(:first_revision) { page.current_revision }
@@ -143,8 +138,7 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request 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)
+          .to change(WikiRevision, :count).by(1)
-          .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)
@@ -163,8 +157,7 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request do
       tag_name.update_columns(tag_id: nil)
 
       expect { update_description }
-          .to change(WikiPage, :count).by(0)
+          .to change(WikiRevision, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
           .and change(WikiVersion, :count).by(1)
           .and change(TagDescriptionVersion, :count).by(1)
 
@@ -184,10 +177,10 @@ RSpec.describe 'Tag description Wiki dual writes', type: :request do
       page_state = page.attributes
       description_state = description.attributes
 
-      update_description(body: 'before', title: 'description_renamed')
+      update_description(body: 'before', title: 'Help:description_renamed')
 
       expect(response).to have_http_status(:ok)
-      expect(tag_name.reload.name).to eq('description_renamed')
+      expect(tag_name.reload.name).to eq('Help: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)

backend/spec/requests/tag_descriptions_spec.rb

@@ -206,13 +206,7 @@ RSpec.describe 'Tag description native API', type: :request do
     context 'without an existing description' do
       before { tag }
 
-      it 'creates a description with synchronised Wiki content and histories' do
+      it 'creates both current resources and histories with matching compatibility IDs' 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)
@@ -221,7 +215,7 @@ RSpec.describe 'Tag description native API', type: :request do
             .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'))
+        page = WikiPage.find(description.id)
         revision = page.current_revision
         version = TagDescriptionVersion.find(revision.id)
         expect(description).to have_attributes(
@@ -233,9 +227,6 @@ RSpec.describe 'Tag description native API', type: :request do
         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 }"

backend/spec/requests/tag_group_wiki_spec.rb

@@ -1,7 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe 'Tag group Wiki facade reads', type: :request do
-  include WikiRecords
   include TagGroupRecords
 
   let!(:user) { create_member_user! }
@@ -70,36 +69,34 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
     end
   end
 
-  it 'combines Tag Groups and Tag Descriptions without Help in the unfiltered list' do
+  it 'combines Tag Groups, Help and Tag Descriptions in the unfiltered list' do
-    help = seed_wiki_page(
+    help = Wiki::Commit.create_legacy_content!(
         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')
+        'タググループ:読取り契約', help.title, '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
+  it 'keeps Help readable when its ID collides with a new group' do
-    help = seed_wiki_page(
+    help = Wiki::Commit.create_legacy_content!(
         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') }).to include(help.title, '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)
+    expect(response).to have_http_status(:ok)
+    expect(json.fetch('body')).to eq('help body')
 
     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')
+        help.title, '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
@@ -125,7 +122,7 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
   end
 
   it 'orders mixed resource history by timestamp rather than independent IDs' do
-    help = seed_wiki_page(
+    help = Wiki::Commit.create_legacy_content!(
         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)
@@ -139,8 +136,8 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
     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(help.title)
-    expect(titles.index('新タグ')).to be < titles.index('タググループ:読取り契約')
+    expect(titles.index(help.title)).to be < titles.index('タググループ:読取り契約')
   end
 
   it 'renders nullable group editors without raising' do
@@ -169,16 +166,16 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
         '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
+  it 'includes Help and group history but excludes legacy-only migrated revisions' do
     extra = Wiki::Commit.legacy_content!(page:, body: 'legacy only', created_user: user)
-    help = seed_wiki_page(
+    help = Wiki::Commit.create_legacy_content!(
         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(
+    expect(json).to include(include(
         'revision_id' => help.current_revision.id,
         'wiki_page' => include('title' => help.title)))
   end
@@ -217,7 +214,7 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
 
   context 'when Help, description and group share the same numeric ID' do
     let(:colliding_help) do
-      seed_wiki_page(
+      Wiki::Commit.create_legacy_content!(
           tag_name: create(:tag_name, name: 'Help:三者ID衝突'),
           body: 'help', created_by_user: user)
     end
@@ -242,12 +239,13 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
       colliding_description_version
     end
 
-    it 'lists both new resources sharing a numeric ID without legacy Help' do
+    it 'lists all three resources without deduplicating their numeric ID' 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_help.id, colliding_help.title],
           [colliding_description.id, '新タグ'],
           [colliding_group_id, 'タググループ:三者ID衝突'])
     end
@@ -261,6 +259,7 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
         [row.fetch('revision_id'), row.fetch('wiki_page').fetch('title')]
       end
       expect(histories).to contain_exactly(
+          [colliding_help.current_revision.id, colliding_help.title],
           [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
@@ -286,8 +285,8 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
     end
   end
 
-  it 'resolves new resources by title while excluding colliding legacy Help' do
+  it 'resolves colliding group, Help and description IDs by title' do
-    help = seed_wiki_page(
+    help = Wiki::Commit.create_legacy_content!(
         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!(
@@ -295,15 +294,11 @@ RSpec.describe 'Tag group Wiki facade reads', type: :request do
     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' }
+    { 'タググループ:ID衝突' => 'group', 'Help:ID衝突' => 'help', '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

@@ -33,11 +33,8 @@ RSpec.describe 'Tag group Wiki facade writes', type: :request do
     end
   end
 
-  it 'creates the group, snapshot and matching compatibility histories' do
+  it 'creates the group, first snapshot and compatibility Wiki history' do
-    expect { create_group }
+    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')
@@ -46,9 +43,10 @@ RSpec.describe 'Tag group Wiki facade writes', type: :request do
     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.body.strip).to eq('- 洗澡鹿')
     expect(page.current_revision.body).to eq(page.body)
     expect(page.wiki_versions.sole.body).to eq(page.body)
+    # New IDs are independently allocated; no global identity assertion here.
   end
 
   it 'keeps repeated placements but only one membership and one snapshot member' do
@@ -295,9 +293,8 @@ RSpec.describe 'Tag group Wiki facade writes', type: :request do
         expect(group_state).to eq(before_state)
       end
 
-      tables = TagGroupRecords::GROUP_TABLES
+      (TagGroupRecords::GROUP_TABLES + ['wiki_pages', 'wiki_revisions', 'wiki_versions'])
-      tables += ['wiki_pages', 'wiki_revisions', 'wiki_versions']
+          .each do |table|
-      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

backend/spec/requests/tag_group_write_integrity_spec.rb

@@ -1,7 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe 'Tag group write integrity', type: :request do
-  include WikiRecords
   include TagGroupRecords
   include ActiveSupport::Testing::TimeHelpers
 
@@ -25,7 +24,7 @@ RSpec.describe 'Tag group write integrity', type: :request do
   end
 
   def create_help body
-    seed_wiki_page(
+    Wiki::Commit.create_legacy_content!(
         tag_name: create(:tag_name, name: 'Help:既存'), body:, created_by_user: user)
   end
 
@@ -71,16 +70,17 @@ RSpec.describe 'Tag group write integrity', type: :request do
       expect(page.body).to eq('- 伊地知ニジカ')
     end
 
-    it 'rejects a standalone Help update despite a colliding group ID' do
+    it 'updates Help with a colliding group ID without altering the group' 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') }
+      put_wiki(id, title: 'Help:改名', body: 'Help after')
 
-      expect(page.reload.body).to eq('Help body')
+      expect(response).to have_http_status(:ok)
-      expect(page.title).to eq('Help:既存')
+      expect(page.reload.body).to eq('Help after')
+      expect(page.title).to eq('Help:改名')
       expect(TagGroup.find(id).attributes).to eq(group_before)
       expect(group_version(id, 1)).to eq(version_before)
     end
@@ -98,8 +98,7 @@ RSpec.describe 'Tag group write integrity', type: :request do
     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: page.id, members:, placements:)
-      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')
@@ -116,19 +115,18 @@ RSpec.describe 'Tag group write integrity', type: :request do
       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') }
+      put_wiki(id, title: 'Help:既存', body: 'Help after')
 
-      expect(page.reload.body).to eq('Help before')
+      expect(response).to have_http_status(:ok)
+      expect(page.reload.body).to eq('Help after')
       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_no_writes { 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(page.reload.body).to eq('Help after')
-      expect(description.reload.body).to eq('description after')
+      expect(description.reload.body).to eq('description')
     end
   end
 
@@ -138,14 +136,14 @@ RSpec.describe 'Tag group write integrity', type: :request do
       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
-        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')
+      page = WikiPage.joins(:tag_name).find_by!(tag_names: { name: 'タググループ:改名' })
+      expect(page.id).not_to eq(help.id)
+      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)
       expect(help.reload.attributes).to eq(help_before)
     end
 

backend/spec/requests/tag_groups_spec.rb

@@ -391,17 +391,6 @@ RSpec.describe 'Tag group native API', type: :request do
         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)
@@ -429,18 +418,19 @@ RSpec.describe 'Tag group native API', type: :request do
         end
       end
 
-      it 'assigns the next group ID from the existing maximum' do
+      it 'uses AUTO_INCREMENT for a new group instead of supplying a compatibility ID' do
-        child_id
+        inserts = []
-        expected_id = [TagGroup.maximum(:id).to_i, TagDescription.maximum(:id).to_i].max + 1
+        subscriber = lambda do |*args|
-        native_write(:create)
+          sql = args.last.fetch(:sql)
-        expect(response).to have_http_status(:created)
+          inserts << sql if sql.match?(/\A\s*INSERT INTO `?tag_groups`?\s/i)
-        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
+        ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') do
+          native_write(:create)
+        end
+        expect(response).to have_http_status(:created)
+        expect(inserts.size).to eq(1)
+        columns = inserts.sole[/\((.*?)\)/, 1].split(',').map { _1.strip.delete('`') }
+        expect(columns).not_to include('id')
       end
 
       it 'updates a native group through Wiki and then reads structured current data' do

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,

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)
 

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(
+        Wiki::Commit.create_content!(
-            tag_name: create(:tag, primary_name: 'wiki_conflict_request').tag_name('ja'),
+            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',
+        params: {
-                  body: 'third',
+          title: 'wiki_conflict_request',
-                  message: 'stale',
+          body: 'third',
-                  base_revision_id: stale_id },
+          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
@@ -10,22 +9,49 @@ RSpec.describe 'Wiki history integrity', type: :request do
   end
 
   def create_wiki_page title:, body: 'body', message: 'init', user: self.user
-    seed_wiki_page(
+    Wiki::Commit.create_content!(
-        tag_name: create(:tag, primary_name: title).tag_name('ja'),
+        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
+    it 'creates wiki_page, wiki_revision, and wiki_version atomically' do
-      expect do
+      expect {
-        post '/wiki', params: { title: 'Help:wiki_history_create_atomic', body: 'initial' },
+        post '/wiki',
+             params: {
+               title: 'Help: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)
+          .to change(WikiPage, :count).by(1)
-          .and change(WikiVersion, :count).by(0)
+          .and change(WikiRevision, :count).by(1)
-      expect(response.status).to be_between(400, 499)
+          .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('Help: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: 'Help: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
@@ -45,19 +71,21 @@ RSpec.describe 'Wiki history integrity', type: :request do
           .where(tag_names: { name: 'Help:wiki_history_blank_body' })).not_to exist
     end
 
-    it 'rejects frozen creation without modifying an existing page or history' do
+    it 'returns 422 and creates no partial page when title already exists' do
       create_wiki_page(title: 'Help:wiki_history_duplicate_title', body: 'first')
 
-      expect do
+      expect {
         post '/wiki',
-             params: { title: 'Help:wiki_history_duplicate_title',
+             params: {
-                       body: 'second', message: 'duplicate' },
+               title: 'Help: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)
+          .not_to change(WikiPage, :count)
-          .and change(WikiVersion, :count).by(0)
 
-      expect(response.status).to be_between(400, 499)
+      expect(response).to have_http_status(:unprocessable_entity)
       expect(WikiPage.joins(:tag_name)
           .where(tag_names: { name: 'Help:wiki_history_duplicate_title' }).count).to eq(1)
     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
@@ -19,7 +18,7 @@ RSpec.describe 'Wiki API', type: :request do
         deprecated_at: Time.zone.local(2026, 6, 1))
   end
   let!(:page) do
-    seed_wiki_page(
+    Wiki::Commit.create_content!(
         tag_name: tn,
         body: 'init',
         created_by_user: user,
@@ -109,14 +108,94 @@ RSpec.describe 'Wiki API', type: :request do
       end
     end
 
-    ['Help:TestPage', 'ヘルプ:ホーム'].each do |title|
+    context 'when success' do
-      it "rejects frozen creation of #{ title } without history writes" do
+      it 'creates wiki_page and first content revision' do
         expect do
-          post endpoint, params: { title:, body: 'initial' }, headers: auth_headers(member)
+          post endpoint, params: { title: 'Help:TestPage', body: "a\nb\nc", message: 'init' },
-        end.to change(WikiPage, :count).by(0)
+                         headers: auth_headers(member)
-            .and change(WikiRevision, :count).by(0)
+        end
-            .and change(WikiVersion, :count).by(0)
+            .to change(WikiPage, :count).by(1)
-        expect(response.status).to be_between(400, 499)
+            .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('Help: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: 'Help: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: 'Help: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: 'Help: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: 'Help: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 +208,10 @@ 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 +249,7 @@ RSpec.describe 'Wiki API', type: :request do
 
         expect do
           put "/wiki/#{page.id}",
-              params: { title: 'TestPage', body: "x\ny", message: 'edit',
+              params: { title: 'TestPage', body: "x\ny", message: 'edit', base_revision_id: current_id },
-                        base_revision_id: current_id },
               headers: auth_headers(member)
         end
             .to change(WikiRevision, :count).by(1)
@@ -206,7 +284,7 @@ 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 +358,13 @@ RSpec.describe 'Wiki API', type: :request do
 
   describe 'GET /wiki/search' do
     before do
-      search_tag = create(:tag, primary_name: 'spec_wiki_title_2')
+      Wiki::Commit.create_content!(
-      seed_wiki_page(
+          tag_name: create(:tag_name, name: 'spec_wiki_title_2'),
-          tag_name: search_tag.tag_name('ja'),
           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,
@@ -439,7 +516,7 @@ 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 +539,7 @@ 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
+  it 'returns 422 when creating wiki with existing title' do
     create_wiki_page(title: 'Help:wiki_collision_create', body: 'already exists')
 
-    expect do
+    expect {
       post '/wiki',
-           params: { title: 'Help:wiki_collision_create', body: 'new body',
+           params: {
-                     message: 'duplicate create' },
+             title: 'Help: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)
+        .not_to change(WikiPage, :count)
-        .and change(WikiVersion, :count).by(0)
 
-    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 +1,115 @@
 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)
+    Wiki::Commit.create_content!(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,
+    Wiki::Commit.content!(page:, body: 'after', created_user: user,
-                                 message: 'legacy edit', base_revision_id: first_revision.id)
+                          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
+  it 'keeps a Tag-linked legacy page in the legacy domain when its title changes' 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)
+    end.to change(WikiRevision, :count).by(1)
-        .and change(WikiVersion, :count).by(0)
+        .and change(WikiVersion, :count).by(1)
         .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([])
+    expect(page.reload).to have_attributes(body: 'changed legacy body')
+    expect(page.title).to eq('legacy_tag_renamed')
+    expect(page.current_revision).to have_attributes(message: 'legacy rename')
   end
 
-  [false, true].each do |explicit|
+  it 'shows legacy current and historical content by ID' do
-    it "rejects legacy diff with #{ explicit ? 'explicit' : 'current' } target" do
+    get "/wiki/#{ page.id }"
-      params = { from: first_revision.id }
+    expect(response).to have_http_status(:ok)
-      params[:to] = last_revision.id if explicit
+    expect(json).to include('body' => 'after', 'revision_id' => last_revision.id,
-      without_group_legacy_reads { get "/wiki/#{ page.id }/diff", params: }
+                           'pred' => first_revision.id, 'succ' => nil)
+    get "/wiki/#{ page.id }", params: { version: first_revision.id }
+    expect(response).to have_http_status(:ok)
+    expect(json).to include('body' => 'before', 'revision_id' => first_revision.id,
+                           'pred' => nil, 'succ' => last_revision.id)
+  end
+
+  it 'shows legacy current and historical content by title' do
+    get "/wiki/title/#{ tag_name.name }"
+    expect(response).to have_http_status(:ok)
+    expect(json).to include('body' => 'after', 'revision_id' => last_revision.id)
+    get "/wiki/title/#{ tag_name.name }", params: { version: first_revision.id }
+    expect(response).to have_http_status(:ok)
+    expect(json).to include('body' => 'before', 'revision_id' => first_revision.id)
+  end
+
+  it 'recognises legacy IDs' do
+    get "/wiki/#{ page.id }/exists"
+    expect(response).to have_http_status(:no_content)
+  end
+
+  it 'recognises legacy titles' do
+    get "/wiki/title/#{ tag_name.name }/exists"
+    expect(response).to have_http_status(:no_content)
+  end
+
+  it 'diffs legacy revisions with explicit and current target' do
+    [last_revision.id, nil].each do |to|
+      get "/wiki/#{ page.id }/diff", params: { from: first_revision.id, to: }
+      expect(response).to have_http_status(:ok)
+      expect(json).to include(
+          'wiki_page_id' => page.id, 'title' => tag_name.name,
+          'older_revision_id' => first_revision.id, 'newer_revision_id' => last_revision.id,
+          'diff' => [{ 'type' => 'removed', 'content' => 'before' },
+                     { 'type' => 'added', 'content' => 'after' }])
+    end
+  end
+
+  describe 'revision resource scope' do
+    let!(:other_page) do
+      Wiki::Commit.create_content!(
+          tag_name: create(:tag_name, name: 'Help_other_contract'),
+          body: 'other page history', created_by_user: user)
+    end
+    let(:other_revision) { other_page.current_revision }
+
+    it 'returns 404 when show specifies another page revision' do
+      get "/wiki/#{ page.id }", params: { version: other_revision.id }
       expect(response).to have_http_status(:not_found)
     end
+
+    it 'returns 404 when diff from belongs to another page' do
+      get "/wiki/#{ page.id }/diff",
+          params: { from: other_revision.id, to: last_revision.id }
+      expect(response).to have_http_status(:not_found)
+    end
+
+    it 'returns 404 when diff to belongs to another page' do
+      get "/wiki/#{ page.id }/diff",
+          params: { from: first_revision.id, to: other_revision.id }
+      expect(response).to have_http_status(:not_found)
+    end
+  end
+
+  it 'retains legacy history metadata and ordering' do
+    get '/wiki/changes', params: { id: page.id }
+    expect(response).to have_http_status(:ok)
+    expect(json.map { |row| row.fetch('revision_id') }).to eq(
+        [last_revision.id, first_revision.id])
+    expect(json.first).to include(
+        'pred' => first_revision.id, 'succ' => nil, 'kind' => 'content',
+        'message' => 'legacy edit', 'timestamp' => last_revision.created_at.iso8601(3),
+        'wiki_page' => { 'id' => page.id, 'title' => tag_name.name, 'deprecated_at' => nil },
+        'user' => { 'id' => user.id, 'name' => user.name })
   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(
+    described_class.create_content!(
-        tag_name: create(:tag, primary_name: title).tag_name('ja'),
+        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
+    it 'creates page, revision, and version with normalised body' do
-      name = create(:tag_name, name: 'Help:frozen_service')
+      expect {
-      counts = [WikiPage.count, WikiRevision.count, WikiVersion.count]
+        described_class.create_content!(
-      expect do
+            tag_name: create(:tag_name, name: 'commit_integrity_create'),
-        described_class.create_content!(tag_name: name, body: 'initial', created_by_user: user)
+            body: "a\r\nb\r\n\r\n",
-      end.to raise_error(ActiveRecord::RecordInvalid)
+            created_by_user: user,
-      expect([WikiPage.count, WikiRevision.count, WikiVersion.count]).to eq(counts)
+            message: 'init')
-    end
+      }
-
+          .to change(WikiPage, :count).by(1)
-    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)
           .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/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

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",
+      "version": "2.8.3",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.1.tgz",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.3.tgz",
-      "integrity": "sha512-3NxN8+78OdzbT7C/WjGsyfPAtJaN3FNDsWxv7Y7mcDsT/oOmgW8BpyQQFFBnvZE3j9Y2Sdz1ULFLezL7Eb2yFw==",
+      "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
+    animationMode: ClientAnimationMode
-    user:           User | null
+    user:     User | null
-    setUser:        Dispatch<SetStateAction<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'
+	  : animationMode === 'reduced'
-	     ? { duration: .08, ease: 'linear' as const }
+	    ? { duration: .08, ease: 'linear' as const }
-	     : { duration: .2, ease: 'easeOut' 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 raf = requestAnimationFrame (() => measure (moreVsbl ? -1 : activeIdx))
-    const bar = barRef.current
+    const onResize = () => requestAnimationFrame (() => measure (moreVsbl ? -1 : activeIdx))
-    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)
 
+    addEventListener ('resize', onResize)
     return () => {
-      active = false
       cancelAnimationFrame (raf)
-      observer?.disconnect ()
+      removeEventListener ('resize', onResize)
-      removeEventListener ('resize', schedule)
-      document.fonts?.removeEventListener ('loadingdone', schedule)
     }
-  }, [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 className="top-nav-root px-3 flex justify-between items-center w-full">
-	<nav ref={barRef}
+	  <div className="flex items-center gap-2 h-12">
-	    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">
 	    <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}
+	    <div ref={navRef} className="relative hidden md:flex h-12 items-center">
-		className="top-nav-desktop-menu relative shrink-0 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',
+		  className={cn ('top-nav-menu-link relative z-10 flex h-full items-center px-5',
-				 'shrink-0 whitespace-nowrap',
 				 (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
+	     className="top-nav-mobile-toggle md:hidden ml-auto border-0 bg-transparent pr-4"
-			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
+	      className="relative z-20 hidden md:block overflow-hidden top-nav-submenu"
-			 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
+		    <div className="absolute inset-0 flex items-center px-3">
-				    overflow-x-auto whitespace-nowrap">
 		      <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
+			 <div className="absolute inset-0 flex items-center px-3">
-					 overflow-x-auto whitespace-nowrap">
 			   {(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
+			       className="absolute inset-0 flex items-center px-3"
-					  overflow-x-auto whitespace-nowrap"
 			       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'
+			 ? 'md:hidden w-full min-h-[40px] flex items-center pl-8'
-			 : 'top-nav-user-desktop shrink-0 whitespace-nowrap ml-auto'),
+			 : '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
+  .top-nav-root
-  {
-    font-size: 1.125rem;
-  }
-
-  .top-nav-layout[data-desktop='true'] .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
-      return null
-    throw error
   }
 }
 

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,
+        1,
-	'/wiki',
+        '/wiki',
-	{ params: { title: '虹' } })
+        { params: { title: '虹' } },
+    )
     expect (api.apiGet).toHaveBeenNthCalledWith (
-	2,
+        2,
-	'/wiki/1',
+        '/wiki/1',
-	{ params: { version: '3' } })
+        { 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,
+        1,
-	'/wiki/title/a%2Fb%20c',
+        '/wiki/title/a%2Fb%20c',
-	{ params: { version: undefined } })
+        { 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)
   })
 })

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
-      return null
-    throw error
   }
 }

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 = (
+export const useMDXComponents = (): MDXComponents => ({ })
-    { 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 })

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 { screen } from '@testing-library/react'
-import { Route, Routes, useLocation } from 'react-router-dom'
+import { Route, Routes } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+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, buildWikiPage } from '@/test/factories'
-import { buildTag, buildUser, 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,
+  const { data: tag } = useQuery ({
-	  isFetching: tagFetching, error: tagError } = 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">

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

@@ -1,144 +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 { apiGet } from '@/lib/api'
-import * as help from '@/lib/help'
-import HelpDetailPage from '@/pages/help/HelpDetailPage'
-import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
-import { buildWikiPage } from '@/test/factories'
-import { helpFixture } from '@/test/helpFixtures'
-import { renderWithProviders } from '@/test/render'
-
-vi.mock ('@/lib/api', () => ({ apiGet: vi.fn () }))
-vi.mock ('@/lib/help', async () => (await import ('@/test/helpFixtures')).helpFixture.api)
-vi.mock ('@/lib/tags', () => ({ fetchTagByName: async () => null }))
-vi.mock ('@/lib/posts', () => ({ fetchPosts: async () => ({ posts: [], count: 0 }) }))
-
-
-const Location = () => {
-  const location = useLocation ()
-  const navigate = useNavigate ()
-  return (
-      <>
-	<output data-testid="location">{location.pathname}{location.search}</output>
-	<button onClick={() => navigate (`/wiki/${ encodeURIComponent ('該当なし') }`)}>
-	  switch title
-	</button>
-      </>)
-}
-
-
-const renderWiki = (title: string) => {
-  const route = `/wiki/${encodeURIComponent (title)}`
-  const { queryClient } = renderWithProviders (
-      <>
-	<Location/>
-	<Routes>
-	  <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
-	  <Route path="/help/:identifier" element={<HelpDetailPage/>}/>
-	  <Route path="/404" element={<div>unexpected redirect</div>}/>
-	</Routes>
-      </>, { route })
-  return { route, queryClient }
-}
-
-
-describe ('Legacy Wiki to Help compatibility', () => {
-  beforeEach (() => {
-    helpFixture.reset ()
-    vi.mocked (apiGet).mockReset ()
-    vi.mocked (apiGet).mockImplementation (async path => {
-      if (path === '/wiki')
-	return []
-      throw { isAxiosError: true, response: { status: 404 } }
-    })
-  })
-
-  it ('keeps a successful Wiki result even when Help has the same title', async () => {
-    vi.mocked (apiGet).mockResolvedValueOnce (buildWikiPage ({
-	title: 'ホーム', body: 'Wiki の現行本文' }))
-    const { route } = renderWiki ('ホーム')
-    await screen.findByText ('Wiki の現行本文')
-    expect (screen.getByTestId ('location')).toHaveTextContent (route)
-    expect (screen.queryByText ('タグを検索する')).not.toBeInTheDocument ()
-    expect (helpFixture.loads.titles).not.toHaveBeenCalled ()
-  })
-
-  it.each (['ホーム', 'ヘルプ:ホーム', '旧ホーム', 'ヘルプ:旧ホーム', 'ホーム第十版']) (
-      'redirects a unique current or historical Japanese title: %s', async title => {
-	renderWiki (title)
-	await waitFor (() => {
-	  expect (screen.getByTestId ('location')).toHaveTextContent ('/help/guide')
-	})
-	expect (await screen.findByRole ('heading', { name: 'ホーム第十版' }))
-	    .toBeInTheDocument ()
-	Object.values (helpFixture.raw).forEach (load => expect (load).not.toHaveBeenCalled ())
-	expect (apiGet).toHaveBeenCalledWith (
-	    `/wiki/title/${encodeURIComponent (title)}`, expect.anything ())
-      })
-
-  it ('keeps the original URL and displays NotFound when no title matches', async () => {
-    const { route, queryClient } = renderWiki ('該当なし')
-    await screen.findByText ('404')
-    await waitFor (() => {
-      expect (helpFixture.loads.titles).toHaveBeenCalled ()
-      expect (queryClient.isFetching ()).toBe (0)
-    })
-    expect (screen.getByTestId ('location')).toHaveTextContent (route)
-    expect (screen.queryByText ('unexpected redirect')).not.toBeInTheDocument ()
-  })
-
-  it ('does not choose between articles with the same title', async () => {
-    helpFixture.assets.titles.default.ja['ホーム'] = ['guide', '設定 手順']
-    const { route, queryClient } = renderWiki ('ホーム')
-    await screen.findByText ('404')
-    await waitFor (() => {
-      expect (helpFixture.loads.titles).toHaveBeenCalled ()
-      expect (queryClient.isFetching ()).toBe (0)
-    })
-    expect (screen.getByTestId ('location')).toHaveTextContent (route)
-  })
-
-  it ('waits for title lookup and does not redirect a later Wiki URL using an old title',
-      async () => {
-	let finish!: (index: Record<string, string[]>) => void
-	const pending = new Promise<Record<string, string[]>> (resolve => {
-	  finish = resolve
-	})
-	const lookup = vi.spyOn (help, 'getHelpTitleIndex').mockReturnValueOnce (pending)
-	renderWiki ('ホーム')
-	await waitFor (() => expect (lookup).toHaveBeenCalled ())
-	expect (screen.queryByText ('404')).not.toBeInTheDocument ()
-	fireEvent.click (screen.getByRole ('button', { name: 'switch title' }))
-	await waitFor (() => expect (apiGet).toHaveBeenCalledWith (
-	    `/wiki/title/${ encodeURIComponent ('該当なし') }`, expect.anything ()))
-	await act (async () => finish ({ 'ホーム': ['guide'] }))
-	await screen.findByText ('404')
-	expect (screen.getByTestId ('location'))
-	    .toHaveTextContent (`/wiki/${ encodeURIComponent ('該当なし') }`)
-      })
-
-  it ('does not treat a Wiki network failure as a missing Wiki', async () => {
-    vi.mocked (apiGet).mockRejectedValueOnce (new Error ('offline'))
-    const { route } = renderWiki ('ホーム')
-    expect (await screen.findByRole ('alert')).toHaveTextContent ('offline')
-    expect (screen.getByTestId ('location')).toHaveTextContent (route)
-    expect (helpFixture.loads.titles).not.toHaveBeenCalled ()
-    expect (screen.queryByText ('404')).not.toBeInTheDocument ()
-    expect (screen.queryByRole ('link', { name: '新規作成してください' }))
-	.not.toBeInTheDocument ()
-  })
-
-  it.each ([403, 500]) ('does not redirect HTTP %s to Help', async status => {
-    vi.mocked (apiGet).mockRejectedValueOnce ({ isAxiosError: true, response: { status } })
-    const { route, queryClient } = renderWiki ('ホーム')
-    await waitFor (() => {
-      expect (apiGet).toHaveBeenCalled ()
-      expect (queryClient.isFetching ()).toBe (0)
-    })
-    expect (screen.getByTestId ('location')).toHaveTextContent (route)
-    expect (screen.queryByText ('タグを検索する')).not.toBeInTheDocument ()
-    expect (helpFixture.loads.titles).not.toHaveBeenCalled ()
-  })
-})

frontend/src/pages/wiki/WikiNewPage.tsx

@@ -1,10 +1,10 @@
-import { useQueryClient } from '@tanstack/react-query'
+import type { FC } from 'react'
+
 import MarkdownIt from 'markdown-it'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import MdEditor from 'react-markdown-editor-lite'
 import { useLocation, useNavigate } from 'react-router-dom'
-import 'react-markdown-editor-lite/lib/index.css'
 
 import FieldError from '@/components/common/FieldError'
 import FormField from '@/components/common/FormField'
@@ -12,13 +12,12 @@ import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
 import { apiPost } from '@/lib/api'
-import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { canEditContent } from '@/lib/users'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 import Forbidden from '@/pages/Forbidden'
 
-import type { FC } from 'react'
+import 'react-markdown-editor-lite/lib/index.css'
 
 import type { User, WikiPage } from '@/types'
 
@@ -39,7 +38,6 @@ const WikiNewPage: FC<Props> = ({ user }) => {
 
   const location = useLocation ()
   const navigate = useNavigate ()
-  const qc = useQueryClient ()
 
   const query = new URLSearchParams (location.search)
   const titleQuery = query.get ('title') ?? ''
@@ -60,13 +58,8 @@ const WikiNewPage: FC<Props> = ({ user }) => {
     {
       const data = await apiPost<WikiPage> ('/wiki', formData,
 				  { headers: { 'Content-Type': 'multipart/form-data' } })
-      await qc.cancelQueries ({ queryKey: wikiKeys.root })
-      qc.setQueryData (wikiKeys.show (data.title, { }), data)
-      await Promise.all ([
-	  qc.invalidateQueries ({ queryKey: wikiKeys.root }),
-	  qc.invalidateQueries ({ queryKey: tagsKeys.root })])
       toast ({ title: '投稿成功!' })
-      navigate (`/wiki/${ encodeURIComponent (data.title) }`)
+      navigate (`/wiki/${ data.title }`)
     }
     catch (e)
     {

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

@@ -1,58 +1,62 @@
 import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { describe, expect, it, vi } from 'vitest'
 
-import { apiGet } from '@/lib/api'
 import WikiSearchPage from '@/pages/wiki/WikiSearchPage'
 import { buildWikiPage } from '@/test/factories'
 import { renderWithProviders } from '@/test/render'
 
-vi.mock ('@/lib/api', () => ({ apiGet: vi.fn () }))
+const api = vi.hoisted (() => ({
+  apiGet: vi.fn (),
+}))
 
+vi.mock ('@/lib/api', () => api)
 
-describe ('Wiki resource identity', () => {
+describe ('WikiSearchPage', () => {
-  beforeEach (() => vi.mocked (apiGet).mockReset ())
-
   it ('loads initial wiki pages and renders links', async () => {
-    vi.mocked (apiGet).mockResolvedValueOnce ([buildWikiPage ({ title: '虹夏' })])
+    api.apiGet.mockResolvedValueOnce ([buildWikiPage ({ title: '虹夏' })])
+
     renderWithProviders (<WikiSearchPage/>)
-    expect (await screen.findByRole ('link', { name: '虹夏' }))
+
-	.toHaveAttribute ('href', '/wiki/%E8%99%B9%E5%A4%8F')
+    expect (await screen.findByRole ('link', { name: '虹夏' })).toHaveAttribute (
-    expect (apiGet).toHaveBeenCalledWith ('/wiki', { params: { title: '' } })
+        'href',
+        '/wiki/%E8%99%B9%E5%A4%8F',
+    )
+    expect (api.apiGet).toHaveBeenCalledWith ('/wiki', { params: { title: '' } })
   })
 
   it ('searches by title on submit', async () => {
-    vi.mocked (apiGet).mockResolvedValueOnce ([])
+    api.apiGet
-	.mockResolvedValueOnce ([buildWikiPage ({ title: '検索結果' })])
+      .mockResolvedValueOnce ([])
+      .mockResolvedValueOnce ([buildWikiPage ({ title: '検索結果' })])
+
     renderWithProviders (<WikiSearchPage/>)
-    await waitFor (() => expect (apiGet).toHaveBeenCalledTimes (1))
+
     fireEvent.change (screen.getAllByRole ('textbox')[0], { target: { value: '検索' } })
     fireEvent.click (screen.getByRole ('button', { name: '検索' }))
-    await waitFor (() => expect (apiGet).toHaveBeenLastCalledWith (
+
-	'/wiki', { params: { title: '検索' } }))
+    await waitFor (() => {
+      expect (api.apiGet).toHaveBeenLastCalledWith (
+          '/wiki',
+          { params: { title: '検索' } },
+      )
+    })
     expect (await screen.findByRole ('link', { name: '検索結果' })).toBeInTheDocument ()
   })
 
   it ('marks deprecated wiki tags in the result title', async () => {
-    vi.mocked (apiGet).mockResolvedValueOnce ([buildWikiPage ({
+    api.apiGet.mockResolvedValueOnce ([
-	title: '旧タグ', deprecatedAt: '2026-06-01T00:00:00.000Z' })])
+        buildWikiPage ({
-    renderWithProviders (<WikiSearchPage/>)
+            title:        '旧タグ',
-    expect (await screen.findByRole ('link', { name: '旧タグ' })).toBeInTheDocument ()
+            deprecatedAt: '2026-06-01T00:00:00.000Z',
-    expect (screen.getByText ('（廃止）').closest ('a')).toBeNull ()
+        }),
-  })
+    ])
 
-  it ('renders colliding description and group IDs with stable distinct keys', async () => {
-    const errors = vi.spyOn (console, 'error').mockImplementation (() => {})
-    const description = buildWikiPage ({ id: 51, title: '説明', resourceType: 'tag_description' })
-    const group = buildWikiPage ({ id: 51, title: 'タググループ:一覧', resourceType: 'tag_group' })
-    vi.mocked (apiGet).mockResolvedValue ([description, group])
     renderWithProviders (<WikiSearchPage/>)
 
-    await screen.findByRole ('link', { name: '説明' })
+    const link = await screen.findByRole ('link', { name: '旧タグ' })
-    expect (screen.getByRole ('link', { name: 'タググループ:一覧' }))
+    const marker = screen.getByText ('（廃止）')
-	.toHaveAttribute ('href', `/wiki/${ encodeURIComponent (group.title) }`)
+
-    await waitFor (() => {
+    expect (link).toBeInTheDocument ()
-      expect (errors.mock.calls.some (args => args.some (value =>
+    expect (marker.closest ('a')).toBeNull ()
-	  String (value).includes ('same key')))).toBe (false)
-    })
   })
 })

frontend/src/pages/wiki/WikiSearchPage.tsx

@@ -81,8 +81,7 @@ const WikiSearchPage: FC = () => {
 	    </thead>
 	    <tbody>
 	      {results.map (page => (
-		  <tr key={`${ page.resourceType }:${ page.id }`}
+		  <tr key={page.id} className="even:bg-gray-100 dark:even:bg-gray-700">
-		      className="even:bg-gray-100 dark:even:bg-gray-700">
 		    <td className="p-2">
 		      <PrefetchLink to={`/wiki/${ encodeURIComponent (page.title) }`}>
 			{page.title}

frontend/src/test/compileMdx.ts

@@ -1,37 +0,0 @@
-import * as jsxRuntime from 'react/jsx-runtime'
-import { ModuleKind, ScriptTarget, transpileModule } from 'typescript'
-
-import { useMDXComponents } from '@/mdx-components'
-import viteConfig from '../../vite.config'
-
-import type { ComponentType } from 'react'
-
-type Transform = (source: string, id: string) => Promise<{ code: string } | null>
-
-
-export const transformMdx = async (source: string, suffix = '.mdx') => {
-  const plugins = viteConfig.plugins?.flat () as { name: string; transform: Transform }[]
-  const plugin = plugins.find (entry => entry.name === '@mdx-js/rollup')
-  if (plugin == null)
-    throw new Error ('The application MDX compiler is not registered')
-  return plugin.transform.call (plugin, source, `/test/help-table${suffix}`)
-}
-
-
-export const compileMdx = async (source: string): Promise<ComponentType> => {
-  const result = await transformMdx (source)
-  if (result == null)
-    throw new Error ('MDX was not compiled')
-  const code = transpileModule (result.code, {
-      compilerOptions: { module: ModuleKind.CommonJS, target: ScriptTarget.ES2022 } }).outputText
-  const exports = { } as { default: ComponentType }
-  const requireFixture = (name: string) => {
-    if (name === 'react/jsx-runtime')
-      return jsxRuntime
-    if (name === '@/mdx-components')
-      return { useMDXComponents }
-    throw new Error (`Unexpected MDX dependency: ${name}`)
-  }
-  new Function ('require', 'exports', code) (requireFixture, exports)
-  return exports.default
-}

frontend/src/test/factories.ts

@@ -59,7 +59,6 @@ export const buildUser = (overrides: Partial<User> = {}): User => ({
 })
 
 export const buildWikiPage = (overrides: Partial<WikiPage> = {}): WikiPage => ({
-  resourceType: 'tag_description',
   id:            1,
   title:         'テストWiki',
   deprecatedAt:  null,

frontend/src/test/helpFixtures.tsx

@@ -1,126 +0,0 @@
-import { createElement } from 'react'
-import { ModuleKind, ScriptTarget, transpileModule } from 'typescript'
-import { vi } from 'vitest'
-
-import source from '@/lib/help.ts?raw'
-
-import type { ComponentType } from 'react'
-
-import type * as Help from '@/lib/help'
-
-export const editionRows = [
-    ['guide', 'ja', '2026-10-01', '旧ホーム', '過去限定本文'],
-    ['guide', 'ja', '2026-10-02', 'ホーム', 'タグを検索する'],
-    ['guide', 'ja', '2026-10-02.2', 'ホーム第二版', '第二版本文'],
-    ['guide', 'ja', '2026-10-02.3', 'ホーム第三版', '第三版本文'],
-    ['guide', 'ja', '2026-10-02.10', 'ホーム第十版', 'タグを検索する 第十版本文'],
-    ['guide', 'ja', '2026-10-02.11', '未公開ホーム', '未公開限定本文'],
-    ['guide', 'en', '2026-10-02', 'Home', 'English body'],
-    ['設定 手順', 'ja', '2026-10-03', '設定', 'タグを設定する']] as const
-
-const compiled = transpileModule (source, {
-    compilerOptions: { module: ModuleKind.CommonJS, target: ScriptTarget.ES2022 } }).outputText
-
-
-// Supply generated virtual modules, executing the actual runtime Help module.
-export const createHelpFixture = () => {
-  const articles: Record<string, Help.ArticleMeta> = {
-      guide: { identifier: 'guide', canonicalLanguage: 'ja', languages: {
-	  ja: { currentEdition: '2026-10-02.10', publishedEditions: [
-	      '2026-10-01', '2026-10-02', '2026-10-02.2', '2026-10-02.3', '2026-10-02.10'] },
-	  en: { currentEdition: '2026-10-02', publishedEditions: ['2026-10-02'] } } },
-      '設定 手順': { identifier: '設定 手順', canonicalLanguage: 'ja', languages: {
-	  ja: { currentEdition: '2026-10-03', publishedEditions: ['2026-10-03'] } } } }
-  const published = editionRows.filter (([id, language, edition]) =>
-      articles[id].languages[language].publishedEditions.includes (edition))
-  const raw = Object.fromEntries (editionRows.map (([id, language, edition, title, body]) => [
-      `../../help/${id}/editions/${language}/${edition}.mdx`,
-      vi.fn (async () => `# ${title}\n\n${body}`)]))
-  const moduleLoads = Object.fromEntries (published.map (([id, language, edition, title, body]) => [
-      `../../help/${id}/editions/${language}/${edition}.mdx`,
-      vi.fn (async (): Promise<{ default: ComponentType }> => ({
-	  default: () => createElement ('div', null,
-	      createElement ('h1', null, title), createElement ('p', null, body)) }))]))
-  // Dynamic imports reuse a module namespace even when called more than once.
-  const caches: Record<string, { promise?: Promise<{ default: ComponentType }> }> = { }
-  const modules = Object.fromEntries (Object.entries (moduleLoads).map (([path, load]) => {
-    caches[path] = { }
-    return [path, vi.fn (() => caches[path].promise ??= load ())]
-  }))
-  const texts = Object.fromEntries (published.map (([id, language, edition, title, body]) => [
-      `${ id }/${ language }/${ edition }`,
-      vi.fn (async () => ({ default: { title, body: `\n${ body }` } }))]))
-  const components = Object.fromEntries (published.map (([id, language, edition]) => [
-      `${ id }/${ language }/${ edition }`,
-      modules[`../../help/${ id }/editions/${ language }/${ edition }.mdx`]]))
-  const sources = Object.fromEntries (published.map (([id, language, edition]) => [
-      `${ id }/${ language }/${ edition }`,
-      async () => ({ default: await raw[
-	  `../../help/${ id }/editions/${ language }/${ edition }.mdx`] () })]))
-  const search: Record<string, Help.HelpSearchEntry[]> = { }
-  const changes: Record<string, Help.HelpChange[]> = { }
-  const titles: Record<string, Help.HelpTitleIndex> = { }
-  published.forEach (([id, language, edition, title, body]) => {
-    const editions = articles[id].languages[language].publishedEditions
-    const index = editions.indexOf (edition)
-    const searchRows = search[language] ??= []
-    if (articles[id].languages[language].currentEdition === edition)
-	searchRows.push ({ identifier: id, edition, title, body: `\n${ body }` })
-    const rows = changes[language] ??= []
-    rows.push ({ identifier: id, edition, title,
-	pred: editions[index - 1] ?? null,
-	change: index === 0 ? 'new' : 'update', date: edition.split ('.')[0] })
-    const lookup = (titles[language] ??= { })
-    const identifiers = lookup[title.trim ().normalize ('NFKC').toLowerCase ()] ??= []
-    if (!(identifiers.includes (id)))
-      identifiers.push (id)
-  })
-  Object.values (changes).forEach (rows => rows.sort ((a, b) => {
-    const [dateA, revisionA = '1'] = a.edition.split ('.')
-    const [dateB, revisionB = '1'] = b.edition.split ('.')
-    return dateB.localeCompare (dateA) || Number (revisionB) - Number (revisionA)
-	|| a.identifier.localeCompare (b.identifier)
-  }))
-  const assets = {
-      articles: { default: articles }, search: { default: search },
-      changes: { default: changes }, titles: { default: titles } }
-  const snapshot = JSON.stringify (assets)
-  const loaders = { components, sources, texts }
-  const loads = {
-      articles: vi.fn (() => assets.articles), search: vi.fn (() => assets.search),
-      changes: vi.fn (() => assets.changes), titles: vi.fn (() => assets.titles),
-      loaders: vi.fn (() => loaders) }
-  const api = { } as typeof Help
-  const requireFixture = (name: string) => {
-    const key = name.replace ('virtual:help/', '') as keyof typeof loads
-    if (Object.hasOwn (loads, key))
-      return loads[key] ()
-    throw new Error (`Unexpected Help dependency: ${name}`)
-  }
-  new Function ('require', 'exports', compiled) (requireFixture, api)
-  const reset = () => {
-    Object.assign (assets, JSON.parse (snapshot))
-    editionRows.forEach (([id, language, edition, title, body]) => {
-      const path = `../../help/${ id }/editions/${ language }/${ edition }.mdx`
-      raw[path].mockReset ().mockResolvedValue (`# ${ title }\n\n${ body }`)
-    })
-    published.forEach (([id, language, edition, title, body]) => {
-      const path = `../../help/${ id }/editions/${ language }/${ edition }.mdx`
-      caches[path].promise = undefined
-      moduleLoads[path].mockClear ()
-      modules[path].mockReset ().mockImplementation (() =>
-	  caches[path].promise ??= moduleLoads[path] ())
-      texts[`${ id }/${ language }/${ edition }`].mockReset ().mockResolvedValue ({
-	  default: { title, body: `\n${ body }` } })
-    })
-    loads.articles.mockReset ().mockImplementation (() => assets.articles)
-    loads.search.mockReset ().mockImplementation (() => assets.search)
-    loads.changes.mockReset ().mockImplementation (() => assets.changes)
-    loads.titles.mockReset ().mockImplementation (() => assets.titles)
-    loads.loaders.mockReset ().mockImplementation (() => loaders)
-  }
-  return { api, assets, loads, raw, modules, moduleLoads, texts, reset }
-}
-
-
-export const helpFixture = createHelpFixture ()

frontend/src/types.ts

@@ -452,7 +452,6 @@ export type ViewFlagBehavior = typeof ViewFlagBehavior[keyof typeof ViewFlagBeha
 
 export type WikiPage = {
     id:             number
-    resourceType:   'tag_description' | 'tag_group'
     title:          string
     deprecatedAt:   string | null
     createdUserId:  number

frontend/src/vite-env.d.ts

@@ -1,29 +1 @@
 /// <reference types="vite/client" />
-
-declare module 'virtual:help/articles' {
-  const articles: Record<string, import ('./lib/help').ArticleMeta>
-  export default articles
-}
-
-declare module 'virtual:help/search' {
-  const search: Record<string, import ('./lib/help').HelpSearchEntry[]>
-  export default search
-}
-
-declare module 'virtual:help/changes' {
-  const changes: Record<string, import ('./lib/help').HelpChange[]>
-  export default changes
-}
-
-declare module 'virtual:help/titles' {
-  const titles: Record<string, import ('./lib/help').HelpTitleIndex>
-  export default titles
-}
-
-declare module 'virtual:help/loaders' {
-  export const components: Record<string,
-      () => Promise<{ default: import ('react').ComponentType }>>
-  export const sources: Record<string, () => Promise<{ default: string }>>
-  export const texts: Record<string,
-      () => Promise<{ default: import ('./lib/help').HelpEditionText }>>
-}

frontend/vite.config.ts

@@ -1,28 +1,12 @@
 import mdx from '@mdx-js/rollup'
 import react from '@vitejs/plugin-react'
 import path from 'path'
-import remarkGFM from 'remark-gfm'
 import { defineConfig } from 'vite'
 
-import { helpAssets } from './scripts/help-assets'
-
-const mdxPlugin = mdx ({ providerImportSource: '@/mdx-components',
-			 remarkPlugins: [remarkGFM] })
-const originalTransform = mdxPlugin.transform
-
-if (typeof originalTransform === 'function')
-  {
-    mdxPlugin.transform =
-	function (code, id)
-	{
-	  return (/[?&](raw|url)(?:&|$)/.test (id)
-		  ? null
-		  : originalTransform.call (this, code, id))
-	}
-  }
 
+// https://vite.dev/config/
 export default defineConfig ({
-    plugins:  [helpAssets (), mdxPlugin, react ()],
+    plugins:  [mdx ({ providerImportSource: '@/mdx-components' }), react ()],
     resolve:  { alias: { '@': path.resolve (__dirname, './src') } },
     server:   { host:         true,
 		port:         5173,