Merge remote-tracking branch 'origin/main' into feature/206

backend/Gemfile

@@ -50,6 +50,8 @@ group :development, :test do
   gem 'factory_bot_rails'
 end
 
+
+
 gem "mysql2", "~> 0.5.6"
 
 gem "image_processing", "~> 1.14"
@@ -67,5 +69,3 @@ gem 'whenever', require: false
 gem 'discard'
 
 gem "rspec-rails", "~> 8.0", :groups => [:development, :test]
-
-gem 'aws-sdk-s3', require: false

backend/Gemfile.lock

@@ -73,25 +73,6 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
       uri (>= 0.13.1)
     ast (2.4.3)
-    aws-eventstream (1.4.0)
-    aws-partitions (1.1231.0)
-    aws-sdk-core (3.244.0)
-      aws-eventstream (~> 1, >= 1.3.0)
-      aws-partitions (~> 1, >= 1.992.0)
-      aws-sigv4 (~> 1.9)
-      base64
-      bigdecimal
-      jmespath (~> 1, >= 1.6.1)
-      logger
-    aws-sdk-kms (1.123.0)
-      aws-sdk-core (~> 3, >= 3.244.0)
-      aws-sigv4 (~> 1.5)
-    aws-sdk-s3 (1.217.0)
-      aws-sdk-core (~> 3, >= 3.244.0)
-      aws-sdk-kms (~> 1)
-      aws-sigv4 (~> 1.5)
-    aws-sigv4 (1.12.1)
-      aws-eventstream (~> 1, >= 1.0.2)
     base64 (0.2.0)
     bcrypt_pbkdf (1.1.1)
     bcrypt_pbkdf (1.1.1-arm64-darwin)
@@ -176,7 +157,6 @@ GEM
       pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    jmespath (1.6.2)
     json (2.12.0)
     jwt (2.10.1)
       base64
@@ -461,7 +441,6 @@ PLATFORMS
   x86_64-linux-musl
 
 DEPENDENCIES
-  aws-sdk-s3
   bootsnap
   brakeman
   diff-lcs

backend/app/controllers/materials_controller.rb

@@ -1,101 +0,0 @@
-class MaterialsController < ApplicationController
-  def index
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    offset = (page - 1) * limit
-
-    tag_id = params[:tag_id].presence
-    parent_id = params[:parent_id].presence
-
-    q = Material.includes(:tag, :created_by_user).with_attached_file
-    q = q.where(tag_id:) if tag_id
-    q = q.where(parent_id:) if parent_id
-
-    count = q.count
-    materials = q.order(created_at: :desc, id: :desc).limit(limit).offset(offset)
-
-    render json: { materials: MaterialRepr.many(materials, host: request.base_url), count: count }
-  end
-
-  def show
-    material =
-        Material
-        .includes(:tag)
-        .with_attached_file
-        .find_by(id: params[:id])
-    return head :not_found unless material
-
-    wiki_page_body = material.tag.tag_name.wiki_page&.current_revision&.body
-
-    render json: MaterialRepr.base(material, host: request.base_url).merge(wiki_page_body:)
-  end
-
-  def create
-    return head :unauthorized unless current_user
-
-    tag_name_raw = params[:tag].to_s.strip
-    file = params[:file]
-    url = params[:url].to_s.strip.presence
-    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
-
-    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-    tag = tag_name.tag
-    tag = Tag.create!(tag_name:, category: :material) unless tag
-
-    material = Material.new(tag:, url:,
-                            created_by_user: current_user,
-                            updated_by_user: current_user)
-    material.file.attach(file)
-
-    if material.save
-      render json: MaterialRepr.base(material, host: request.base_url), status: :created
-    else
-      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
-    end
-  end
-
-  def update
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    material = Material.with_attached_file.find_by(id: params[:id])
-    return head :not_found unless material
-
-    tag_name_raw = params[:tag].to_s.strip
-    file = params[:file]
-    url = params[:url].to_s.strip.presence
-    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
-
-    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-    tag = tag_name.tag
-    tag = Tag.create!(tag_name:, category: :material) unless tag
-
-    material.update!(tag:, url:, updated_by_user: current_user)
-    if file
-      material.file.attach(file)
-    else
-      material.file.purge
-    end
-
-    if material.save
-      render json: MaterialRepr.base(material, host: request.base_url)
-    else
-      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
-    end
-  end
-
-  def destroy
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    material = Material.find_by(id: params[:id])
-    return head :not_found unless material
-
-    material.discard
-    head :no_content
-  end
-end

backend/app/controllers/nico_tags_controller.rb

@@ -30,22 +30,15 @@ class NicoTagsController < ApplicationController
     id = params[:id].to_i
 
     tag = Tag.find(id)
-    return head :bad_request unless tag.nico?
+    return head :bad_request if tag.category != 'nico'
 
-    linked_tag_names = params[:tags].to_s.split
+    linked_tag_names = params[:tags].to_s.split(' ')
-    linked_tags = Tag.normalise_tags(linked_tag_names, with_tagme: false,
+    linked_tags = Tag.normalise_tags(linked_tag_names, with_tagme: false)
-                                                       with_no_deerjikist: false)
+    return head :bad_request if linked_tags.any? { |t| t.category == 'nico' }
-    return head :bad_request if linked_tags.any? { |t| t.nico? }
-
-    ApplicationRecord.transaction do
-      TagVersioning.record_tag_snapshots!(linked_tags, created_by_user: current_user)
 
     tag.linked_tags = linked_tags
     tag.save!
 
-      NicoTagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
-    end
-
     render json: tag.linked_tags.map { |t| TagRepr.base(t) }, status: :ok
   end
 end

backend/app/controllers/post_versions_controller.rb

@@ -1,119 +0,0 @@
-class PostVersionsController < ApplicationController
-  def index
-    post_id = params[:post].presence
-    tag_id = params[:tag].presence
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    offset = (page - 1) * limit
-
-    tag_name =
-        if tag_id
-          TagName.joins(:tag).find_by(tag: { id: tag_id })
-        end
-    return render json: { versions: [], count: 0 } if tag_id && tag_name.blank?
-
-    q = PostVersion.joins(<<~SQL.squish)
-          LEFT JOIN
-            post_versions prev
-            ON
-              prev.post_id = post_versions.post_id
-              AND prev.version_no = post_versions.version_no - 1
-        SQL
-        .select('post_versions.*', 'prev.title AS prev_title', 'prev.url AS prev_url',
-                'prev.thumbnail_base AS prev_thumbnail_base', 'prev.tags AS prev_tags',
-                'prev.original_created_from AS prev_original_created_from',
-                'prev.original_created_before AS prev_original_created_before')
-    q = q.where('post_versions.post_id = ?', post_id) if post_id
-    if tag_name
-      escaped = ActiveRecord::Base.sanitize_sql_like(tag_name.name)
-      q = q.where(("CONCAT(' ', post_versions.tags, ' ') LIKE :kw " +
-                   "OR CONCAT(' ', prev.tags, ' ') LIKE :kw"),
-                  kw: "% #{ escaped } %")
-    end
-
-    count = q.except(:select, :order, :limit, :offset).count
-
-    versions = q.order(Arel.sql('post_versions.created_at DESC, post_versions.id DESC'))
-                .limit(limit)
-                .offset(offset)
-
-    render json: { versions: serialise_versions(versions), count: }
-  end
-
-  private
-
-  def serialise_versions rows
-    user_ids = rows.map(&:created_by_user_id).compact.uniq
-    users_by_id = User.where(id: user_ids).pluck(:id, :name).to_h
-
-    rows.map do |row|
-      cur_tags = split_tags(row.tags)
-      prev_tags = split_tags(row.attributes['prev_tags'])
-
-      {
-        post_id: row.post_id,
-        version_no: row.version_no,
-        event_type: row.event_type,
-        title: {
-          current: row.title,
-          prev: row.attributes['prev_title']
-        },
-        url: {
-          current: row.url,
-          prev: row.attributes['prev_url']
-        },
-        thumbnail: {
-          current: nil,
-          prev: nil
-        },
-        thumbnail_base: {
-          current: row.thumbnail_base,
-          prev: row.attributes['prev_thumbnail_base']
-        },
-        tags: build_version_tags(cur_tags, prev_tags),
-        original_created_from: {
-          current: row.original_created_from&.iso8601,
-          prev: row.attributes['prev_original_created_from']&.iso8601
-        },
-        original_created_before: {
-          current: row.original_created_before&.iso8601,
-          prev: row.attributes['prev_original_created_before']&.iso8601
-        },
-        created_at: row.created_at.iso8601,
-        created_by_user:
-          if row.created_by_user_id
-            {
-              id: row.created_by_user_id,
-              name: users_by_id[row.created_by_user_id]
-            }
-          end
-      }
-    end
-  end
-
-  def build_version_tags(cur_tags, prev_tags)
-    (cur_tags | prev_tags).map do |name|
-      type =
-        if cur_tags.include?(name) && prev_tags.include?(name)
-          'context'
-        elsif cur_tags.include?(name)
-          'added'
-        else
-          'removed'
-        end
-
-      {
-        name:,
-        type:
-      }
-    end
-  end
-
-  def split_tags(tags)
-    tags.to_s.split(/\s+/).reject(&:blank?)
-  end
-end

backend/app/controllers/posts_controller.rb

@@ -44,7 +44,7 @@ class PostsController < ApplicationController
         filtered_posts
         .joins("LEFT JOIN (#{ pt_max_sql }) pt_max ON pt_max.post_id = posts.id")
         .reselect('posts.*', Arel.sql("#{ updated_at_all_sql } AS updated_at_all"))
-        .preload(tags: [:materials, { tag_name: :wiki_page }])
+        .preload(tags: { tag_name: :wiki_page })
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -75,7 +75,7 @@ class PostsController < ApplicationController
         else
           "posts.#{ order[0] }"
         end
-    posts = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, posts.id #{ order[1] }"))
+    posts = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, id #{ order[1] }"))
              .limit(limit)
              .offset(offset)
              .to_a
@@ -95,21 +95,28 @@ class PostsController < ApplicationController
   end
 
   def random
-    post = filtered_posts.preload(tags: [:materials, { tag_name: :wiki_page }])
+    post = filtered_posts.preload(tags: { tag_name: :wiki_page })
                          .order('RAND()')
                          .first
     return head :not_found unless post
 
-    render json: PostRepr.base(post, current_user)
+    viewed = current_user&.viewed?(post) || false
+
+    render json: PostRepr.base(post).merge(viewed:)
   end
 
   def show
-    post = Post.includes(tags: [:materials, { tag_name: :wiki_page }]).find_by(id: params[:id])
+    post = Post.includes(tags: { tag_name: :wiki_page }).find_by(id: params[:id])
     return head :not_found unless post
 
-    render json: PostRepr.base(post, current_user)
+    viewed = current_user&.viewed?(post) || false
-                         .merge(tags: build_tag_tree_for(post.tags),
+
-                                related: post.related(limit: 20))
+    json = post.as_json
+    json['tags'] = build_tag_tree_for(post.tags)
+    json['related'] = post.related(limit: 20)
+    json['viewed'] = viewed
+
+    render json:
   end
 
   def create
@@ -127,22 +134,17 @@ class PostsController < ApplicationController
     post = Post.new(title:, url:, thumbnail_base: nil, uploaded_user: current_user,
                     original_created_from:, original_created_before:)
     post.thumbnail.attach(thumbnail)
-
+    if post.save
-    ApplicationRecord.transaction do
+      post.resized_thumbnail!
-      post.save!
       tags = Tag.normalise_tags(tag_names)
-      TagVersioning.record_tag_snapshots!(tags, created_by_user: current_user)
-
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
-      post.resized_thumbnail!
-      PostVersionRecorder.record!(post:, event_type: :create, created_by_user: current_user)
-    end
 
       post.reload
       render json: PostRepr.base(post), status: :created
-  rescue ActiveRecord::RecordInvalid
+    else
       render json: { errors: post.errors.full_messages }, status: :unprocessable_entity
+    end
   rescue Tag::NicoTagNormalisationError
     head :bad_request
   end
@@ -171,34 +173,25 @@ class PostsController < ApplicationController
     original_created_before = params[:original_created_before]
 
     post = Post.find(params[:id].to_i)
-
+    if post.update(title:, original_created_from:, original_created_before:)
-    ApplicationRecord.transaction do
+      tags = post.tags.where(category: 'nico').to_a +
-      PostVersionRecorder.ensure_snapshot!(post, created_by_user: current_user)
+             Tag.normalise_tags(tag_names, with_tagme: false)
-
-      post.update!(title:, original_created_from:, original_created_before:)
-
-      normalised_tags = Tag.normalise_tags(tag_names, with_tagme: false)
-      TagVersioning.record_tag_snapshots!(normalised_tags, created_by_user: current_user)
-
-      tags = post.tags.nico.to_a + normalised_tags
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
-      PostVersionRecorder.record!(post:, event_type: :update, created_by_user: current_user)
-    end
 
       post.reload
       json = post.as_json
       json['tags'] = build_tag_tree_for(post.tags)
       render json:, status: :ok
-  rescue ActiveRecord::RecordInvalid
+    else
       render json: post.errors, status: :unprocessable_entity
+    end
   rescue Tag::NicoTagNormalisationError
     head :bad_request
   end
 
   def changes
     id = params[:id].presence
-    tag_id = params[:tag].presence
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
 
@@ -209,9 +202,8 @@ class PostsController < ApplicationController
 
     pts = PostTag.with_discarded
     pts = pts.where(post_id: id) if id.present?
-    pts = pts.where(tag_id:) if tag_id.present?
     pts = pts.includes(:post, :created_user, :deleted_user,
-                       tag: [:materials, { tag_name: :wiki_page }])
+                       tag: { tag_name: :wiki_page })
 
     events = []
     pts.each do |pt|
@@ -253,40 +245,18 @@ class PostsController < ApplicationController
   end
 
   def filter_posts_by_tags tag_names, match_type
-    literals = tag_names.map do |raw_name|
+    tag_names = TagName.canonicalise(tag_names)
-      { name: TagName.canonicalise(raw_name.sub(/\Anot:/i, '')).first,
-        negative: raw_name.downcase.start_with?('not:') }
-    end
 
-    return Post.all if literals.empty?
+    posts = Post.joins(tags: :tag_name)
 
     if match_type == 'any'
-      literals.reduce(Post.none) do |posts, literal|
+      posts.where(tag_names: { name: tag_names }).distinct
-        posts.or(tag_literal_relation(literal[:name], negative: literal[:negative]))
-      end
     else
-      literals.reduce(Post.all) do |posts, literal|
+      posts.where(tag_names: { name: tag_names })
-        ids = tagged_post_ids_for(literal[:name])
+           .group('posts.id')
-        if literal[:negative]
+           .having('COUNT(DISTINCT tag_names.id) = ?', tag_names.uniq.size)
-          posts.where.not(id: ids)
-        else
-          posts.where(id: ids)
     end
   end
-    end
-  end
-
-  def tag_literal_relation name, negative:
-    ids = tagged_post_ids_for(name)
-    if negative
-      Post.where.not(id: ids)
-    else
-      Post.where(id: ids)
-    end
-  end
-
-  def tagged_post_ids_for(name) =
-      Post.joins(tags: :tag_name).where(tag_names: { name: }).select(:id)
 
   def sync_post_tags! post, desired_tags
     desired_tags.each do |t|

backend/app/controllers/tag_children_controller.rb

@@ -7,16 +7,7 @@ class TagChildrenController < ApplicationController
     child_id = params[:child_id]
     return head :bad_request if parent_id.blank? || child_id.blank?
 
-    parent = Tag.find(parent_id)
+    Tag.find(parent_id).children << Tag.find(child_id) rescue nil
-    child = Tag.find(child_id)
-    return head :bad_request if parent.nico? || child.nico?
-
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
-
-      TagImplication.find_or_create_by!(parent_tag: parent, tag: child)
-      TagVersionRecorder.record!(tag: child, event_type: :update, created_by_user: current_user)
-    end
 
     head :no_content
   end
@@ -29,16 +20,7 @@ class TagChildrenController < ApplicationController
     child_id = params[:child_id]
     return head :bad_request if parent_id.blank? || child_id.blank?
 
-    parent = Tag.find(parent_id)
+    Tag.find(parent_id).children.delete(Tag.find(child_id)) rescue nil
-    child = Tag.find(child_id)
-    return head :bad_request if parent.nico? || child.nico?
-
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
-
-      TagImplication.find_by(parent_tag: parent, tag: child)&.destroy!
-      TagVersionRecorder.record!(tag: child, event_type: :update, created_by_user: current_user)
-    end
 
     head :no_content
   end

backend/app/controllers/tag_versions_controller.rb

@@ -1,92 +0,0 @@
-class TagVersionsController < ApplicationController
-  def index
-    tag_id = params[:id].presence
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    offset = (page - 1) * limit
-
-    q = TagVersion.joins(<<~SQL.squish)
-          LEFT JOIN
-            tag_versions prev
-            ON
-              prev.tag_id = tag_versions.tag_id
-              AND prev.version_no = tag_versions.version_no - 1
-        SQL
-      .select('tag_versions.*', 'prev.name AS prev_name', 'prev.category AS prev_category',
-              'prev.aliases AS prev_aliases', 'prev.parent_tag_ids AS prev_parent_tag_ids')
-    q = q.where('tag_versions.tag_id = ?', tag_id) if tag_id
-
-    count = q.except(:select, :order, :limit, :offset).count
-
-    versions = q.order(Arel.sql('tag_versions.created_at DESC, tag_versions.id DESC'))
-                .limit(limit)
-                .offset(offset)
-
-    render json: { versions: serialise_versions(versions), count: }
-  end
-
-  private
-
-  def serialise_versions rows
-    user_ids = rows.map(&:created_by_user_id).compact.uniq
-    users_by_id = User.where(id: user_ids).pluck(:id, :name).to_h
-
-    rows.map do |row|
-      cur_aliases = split_values(row.aliases)
-      prev_aliases = split_values(row.attributes['prev_aliases'])
-
-      cur_parent_tag_ids = split_parent_tag_ids(row.parent_tag_ids)
-      prev_parent_tag_ids = split_parent_tag_ids(row.attributes['prev_parent_tag_ids'])
-
-      all_parent_tag_ids = (cur_parent_tag_ids | prev_parent_tag_ids)
-
-      tags_by_id =
-          Tag
-          .includes(:tag_name, :materials, { tag_name: :wiki_page })
-          .where(id: all_parent_tag_ids)
-          .index_by(&:id)
-
-      parent_tags =
-          build_version_values(cur_parent_tag_ids, prev_parent_tag_ids, key: :tag_id)
-          .map do |h|
-            { tag: TagRepr.base(tags_by_id[h[:tag_id]]),
-              type: h[:type] }
-          end
-
-      { tag_id: row.tag_id,
-        version_no: row.version_no,
-        event_type: row.event_type,
-        name: { current: row.name, prev: row.attributes['prev_name'] },
-        category: { current: row.category, prev: row.attributes['prev_category'] },
-        aliases: build_version_values(cur_aliases, prev_aliases, key: :name),
-        parent_tags:,
-        created_at: row.created_at.iso8601,
-        created_by_user: row.created_by_user_id &&
-                         { id: row.created_by_user_id,
-                           name: users_by_id[row.created_by_user_id] } }
-    end
-  end
-
-  def build_version_values cur_values, prev_values, key:
-    (cur_values | prev_values).map do |value|
-      type =
-          if cur_values.include?(value) && prev_values.include?(value)
-            'context'
-          elsif cur_values.include?(value)
-            'added'
-          else
-            'removed'
-          end
-
-      { key => value, type: }
-    end
-  end
-
-  def split_values(values) = values.to_s.split(/\s+/).reject(&:blank?)
-
-  def split_parent_tag_ids(values) = split_values(values).map(&:to_i)
-end

backend/app/controllers/tags_controller.rb

@@ -2,113 +2,23 @@ class TagsController < ApplicationController
   def index
     post_id = params[:post]
 
-    name = params[:name].presence
+    tags =
-    category = params[:category].presence
-    post_count_between = (params[:post_count_gte].presence || -1).to_i,
-                         (params[:post_count_lte].presence || -1).to_i
-    post_count_between[0] = nil if post_count_between[0] < 0
-    post_count_between[1] = nil if post_count_between[1] < 0
-    created_between = params[:created_from].presence, params[:created_to].presence
-    updated_between = params[:updated_from].presence, params[:updated_to].presence
-
-    order = params[:order].to_s.split(':', 2).map(&:strip)
-    unless order[0].in?(['name', 'category', 'post_count', 'created_at', 'updated_at'])
-      order[0] = 'post_count'
-    end
-    unless order[1].in?(['asc', 'desc'])
-      order[1] = order[0].in?(['name', 'category']) ? 'asc' : 'desc'
-    end
-
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    offset = (page - 1) * limit
-
-    q =
         if post_id.present?
           Tag.joins(:posts, :tag_name)
         else
           Tag.joins(:tag_name)
         end
-        .includes(:tag_name, :materials, tag_name: :wiki_page)
+        .includes(:tag_name, tag_name: :wiki_page)
-    q = q.where(posts: { id: post_id }) if post_id.present?
+    if post_id.present?
-
+      tags = tags.where(posts: { id: post_id })
-    q = q.where('tag_names.name LIKE ?', "%#{ name }%") if name
-    q = q.where(category:) if category
-    q = q.where('tags.post_count >= ?', post_count_between[0]) if post_count_between[0]
-    q = q.where('tags.post_count <= ?', post_count_between[1]) if post_count_between[1]
-    q = q.where('tags.created_at >= ?', created_between[0]) if created_between[0]
-    q = q.where('tags.created_at <= ?', created_between[1]) if created_between[1]
-    q = q.where('tags.updated_at >= ?', updated_between[0]) if updated_between[0]
-    q = q.where('tags.updated_at <= ?', updated_between[1]) if updated_between[1]
-
-    sort_sql =
-        case order[0]
-        when 'name'
-          'tag_names.name'
-        when 'category'
-          'CASE tags.category ' +
-          "WHEN 'deerjikist' THEN 0 " +
-          "WHEN 'meme' THEN 1 " +
-          "WHEN 'character' THEN 2 " +
-          "WHEN 'general' THEN 3 " +
-          "WHEN 'material' THEN 4 " +
-          "WHEN 'meta' THEN 5 " +
-          "WHEN 'nico' THEN 6 END"
-        else
-          "tags.#{ order[0] }"
-        end
-    tags = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, tags.id #{ order[1] }"))
-            .limit(limit)
-            .offset(offset)
-            .to_a
-
-    render json: { tags: TagRepr.many(tags), count: q.size }
     end
 
-  def with_depth
+    render json: TagRepr.base(tags)
-    parent_tag_id = params[:parent].to_i
-    parent_tag_id = nil if parent_tag_id <= 0
-
-    tag_ids =
-        if parent_tag_id
-          TagImplication.where(parent_tag_id:).select(:tag_id)
-        else
-          Tag.where.not(id: TagImplication.select(:tag_id)).select(:id)
-        end
-
-    tags =
-        Tag
-        .joins(:tag_name)
-        .includes(:tag_name, :materials, tag_name: :wiki_page)
-        .where(category: [:meme, :character, :material])
-        .where(id: tag_ids)
-        .order('tag_names.name')
-        .distinct
-        .to_a
-
-    has_children_tag_ids =
-        if tags.empty?
-          []
-        else
-          TagImplication
-              .joins(:tag)
-              .where(parent_tag_id: tags.map(&:id),
-                     tags: { category: [:meme, :character, :material] })
-              .distinct
-              .pluck(:parent_tag_id)
-        end
-
-    render json: tags.map { |tag|
-      TagRepr.base(tag).merge(has_children: has_children_tag_ids.include?(tag.id), children: [])
-    }
   end
 
   def autocomplete
-    q = params[:q].to_s.strip.sub(/\Anot:/i, '')
+    q = params[:q].to_s.strip
+    return render json: [] if q.blank?
 
     with_nico = bool?(:nico, default: true)
     present_only = bool?(:present, default: true)
@@ -128,7 +38,7 @@ class TagsController < ApplicationController
     end
 
     base = Tag.joins(:tag_name)
-              .includes(:tag_name, :materials, tag_name: :wiki_page)
+              .includes(:tag_name, tag_name: :wiki_page)
     base = base.where('tags.post_count > 0') if present_only
 
     canonical_hit =
@@ -153,7 +63,7 @@ class TagsController < ApplicationController
 
   def show
     tag = Tag.joins(:tag_name)
-             .includes(:tag_name, :materials, tag_name: :wiki_page)
+             .includes(:tag_name, tag_name: :wiki_page)
              .find_by(id: params[:id])
     if tag
       render json: TagRepr.base(tag)
@@ -167,7 +77,7 @@ class TagsController < ApplicationController
     return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
-             .includes(:tag_name, :materials, tag_name: :wiki_page)
+             .includes(:tag_name, tag_name: :wiki_page)
              .find_by(tag_names: { name: })
     if tag
       render json: TagRepr.base(tag)
@@ -197,72 +107,6 @@ class TagsController < ApplicationController
     render json: DeerjikistRepr.many(tag.deerjikists)
   end
 
-  def materials_by_name
-    name = params[:name].to_s.strip
-    return head :bad_request if name.blank?
-
-    tag = Tag.joins(:tag_name)
-             .includes(:tag_name, :materials, tag_name: :wiki_page)
-             .find_by(tag_names: { name: })
-    return head :not_found unless tag
-
-    render json: build_tag_children(tag)
-  end
-
-  def update_all
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    tag = Tag.find_by(id: params[:id])
-    return head :not_found unless tag
-
-    name = params[:name].to_s.strip
-    category = params[:category].to_s.strip
-    return head :unprocessable_entity if name.blank? || category.blank?
-
-    if name != tag.name &&
-        tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
-      return render json: { error: 'システム・タグの名称は変更できません．' },
-                    status: :unprocessable_entity
-    end
-
-    if tag.nico? || category == 'nico'
-      return render json: { error: 'ニコタグは変更できません．' },
-                    status: :unprocessable_entity
-    end
-
-    alias_names = params[:aliases].to_s.split.uniq
-    parent_names = params[:parent_tags].to_s.split.uniq
-
-    ApplicationRecord.transaction do
-      TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
-
-      old_name = tag.name
-      name_changed = name != old_name
-      wiki_page = tag.tag_name.wiki_page if name_changed
-
-      tag.update!(category:)
-      tag.tag_name.update!(name:)
-
-      alias_names << old_name if name_changed
-      alias_names.delete(name)
-
-      update_aliases!(tag, alias_names)
-      update_parent_tags!(tag, parent_names)
-
-      tag.reload
-
-      record_tag_version!(
-          tag,
-          event_type: :update,
-          created_by_user: current_user,
-          name_changed:,
-          wiki_page:)
-    end
-
-    render json: TagRepr.base(tag.reload)
-  end
-
   def update
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
@@ -272,100 +116,14 @@ class TagsController < ApplicationController
 
     tag = Tag.find(params[:id])
 
-    if tag.nico? || (category.present? && category == 'nico')
+    if name.present?
-      return render json: { error: 'ニコタグは変更できません．' },
+      tag.tag_name.update!(name:)
-                    status: :unprocessable_entity
     end
 
-    ApplicationRecord.transaction do
+    if category.present?
-      TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
+      tag.update!(category:)
-
-      old_name = tag.name
-      name_changed = name.present? && name != old_name
-      wiki_page = tag.tag_name.wiki_page if name_changed
-
-      tag.tag_name.update!(name:) if name.present?
-      tag.update!(category:) if category.present?
-
-      tag.reload
-
-      record_tag_version!(
-          tag,
-          event_type: :update,
-          created_by_user: current_user,
-          name_changed:,
-          wiki_page:)
     end
 
-    render json: TagRepr.base(tag.reload)
+    render json: TagRepr.base(tag)
-  end
-
-  private
-
-  def build_tag_children tag
-    material = tag.materials.first
-    file = nil
-    content_type = nil
-    if material&.file&.attached?
-      file = rails_storage_proxy_url(material.file, only_path: false)
-      content_type = material.file.blob.content_type
-    end
-
-    TagRepr.base(tag).merge(
-        children: tag.children.sort_by { _1.name }.map { build_tag_children(_1) },
-        material: material.as_json&.merge(file:, content_type:))
-  end
-
-  def record_tag_version! tag, event_type:, created_by_user:, name_changed: false, wiki_page: nil
-    if tag.nico?
-      NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-      return
-    end
-
-    TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-
-    return unless name_changed
-
-    wiki_page ||= tag.tag_name.wiki_page
-    return unless wiki_page&.wiki_versions&.exists?
-
-    WikiVersionRecorder.record!(
-        page: wiki_page,
-        event_type: :update,
-        created_by_user:)
-  end
-
-  def update_aliases! tag, alias_names
-    current_aliases = tag.tag_name.aliases.to_a
-
-    current_aliases.each do |alias_tag_name|
-      next if alias_names.include?(alias_tag_name.name)
-
-      alias_tag_name.update!(canonical: nil)
-    end
-
-    alias_names.each do |alias_name|
-      alias_tag_name = TagName.find_undiscard_or_create_by!(name: alias_name)
-      alias_tag_name.update!(canonical: tag.tag_name)
-    end
-  end
-
-  def update_parent_tags! tag, parent_names
-    parent_tags = Tag.normalise_tags(parent_names, with_tagme: false,
-                                                   with_no_deerjikist: false,
-                                                   deny_nico: true)
-
-    old_parent_tags = tag.parents.to_a
-
-    TagVersioning.record_tag_snapshots!((old_parent_tags + parent_tags).uniq,
-                                        created_by_user: current_user)
-
-    tag.reversed_tag_implications.destroy_all
-
-    parent_tags.each do |parent_tag|
-      next if parent_tag == tag
-
-      TagImplication.create!(tag:, parent_tag:)
-    end
   end
 end

backend/app/controllers/theatre_comments_controller.rb

@@ -1,32 +0,0 @@
-class TheatreCommentsController < ApplicationController
-  def index
-    no_gt = params[:no_gt].to_i
-    no_gt = 0 if no_gt.negative?
-
-    comments = TheatreComment
-               .where(theatre_id: params[:theatre_id])
-               .where('no > ?', no_gt)
-               .order(no: :desc)
-
-    render json: comments.as_json(include: { user: { only: [:id, :name] } })
-  end
-
-  def create
-    return head :unauthorized unless current_user
-
-    content = params[:content]
-    return head :unprocessable_entity if content.blank?
-
-    theatre = Theatre.find_by(id: params[:theatre_id])
-    return head :not_found unless theatre
-
-    comment = nil
-    theatre.with_lock do
-      no = theatre.next_comment_no
-      comment = TheatreComment.create!(theatre:, no:, user: current_user, content:)
-      theatre.update!(next_comment_no: no + 1)
-    end
-
-    render json: comment, status: :created
-  end
-end

backend/app/controllers/theatres_controller.rb

@@ -1,54 +0,0 @@
-class TheatresController < ApplicationController
-  def show
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-
-    render json: TheatreRepr.base(theatre)
-  end
-
-  def watching
-    return head :unauthorized unless current_user
-
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-
-    host_flg = false
-    post_id = nil
-    post_started_at = nil
-
-    theatre.with_lock do
-      TheatreWatchingUser.find_or_initialize_by(theatre:, user: current_user).tap {
-        _1.expires_at = 30.seconds.from_now
-      }.save!
-
-      if (!(theatre.host_user_id?) ||
-          !(theatre.watching_users.exists?(id: theatre.host_user_id)))
-        theatre.update!(host_user_id: current_user.id)
-      end
-
-      host_flg = theatre.host_user_id == current_user.id
-      post_id = theatre.current_post_id
-      post_started_at = theatre.current_post_started_at
-    end
-
-    render json: {
-        host_flg:, post_id:, post_started_at:,
-        watching_users: theatre.watching_users.as_json(only: [:id, :name]) }
-  end
-
-  def next_post
-    return head :unauthorized unless current_user
-
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-    return head :forbidden if theatre.host_user != current_user
-
-    post = Post.where("url LIKE '%nicovideo.jp%'")
-           .or(Post.where("url LIKE '%youtube.com%'"))
-           .order('RAND()')
-           .first
-    theatre.update!(current_post: post, current_post_started_at: Time.current)
-
-    head :no_content
-  end
-end

backend/app/controllers/users_controller.rb

@@ -1,26 +1,18 @@
 class UsersController < ApplicationController
   def create
-    return head :unprocessable_entity if request.remote_ip.blank?
+    user = User.create!(inheritance_code: SecureRandom.uuid, role: 'guest')
-
-    user = nil
-
-    User.transaction do
-      user = User.create!(inheritance_code: SecureRandom.uuid, role: :guest)
-      attach_ip_address!(user)
-    end
-
     render json: { code: user.inheritance_code,
-                   user: user.slice(:id, :name, :inheritance_code, :role) },
+                   user: user.slice(:id, :name, :inheritance_code, :role) }
-           status: :created
   end
 
   def verify
+    ip_bin = IPAddr.new(request.remote_ip).hton
+    ip_address = IpAddress.find_or_create_by!(ip_address: ip_bin)
+
     user = User.find_by(inheritance_code: params[:code])
     return render json: { valid: false } unless user
 
-    return head :unprocessable_entity if request.remote_ip.blank?
+    UserIp.find_or_create_by!(user:, ip_address:)
-
-    attach_ip_address!(user)
 
     render json: { valid: true, user: user.slice(:id, :name, :inheritance_code, :role) }
   end
@@ -49,18 +41,9 @@ class UsersController < ApplicationController
     return head :bad_request if name.blank?
 
     if user.update(name:)
-      render json: user.slice(:id, :name, :inheritance_code, :role), status: :ok
+      render json: user.slice(:id, :name, :inheritance_code, :role), status: :created
     else
       render json: user.errors, status: :unprocessable_entity
     end
   end
-
-  private
-
-  def attach_ip_address! user
-    ip_bin = IPAddr.new(request.remote_ip).hton
-    ip_address = IpAddress.create_or_find_by!(ip_address: ip_bin)
-
-    UserIp.create_or_find_by!(user:, ip_address:)
-  end
 end

backend/app/controllers/wiki_pages_controller.rb

@@ -85,24 +85,22 @@ class WikiPagesController < ApplicationController
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
 
-    title = params[:title].to_s.strip
+    name = params[:title]&.strip
     body = params[:body].to_s
+
+    return head :unprocessable_entity if name.blank? || body.blank?
+
+    tag_name = TagName.find_or_create_by!(name:)
+    page = WikiPage.new(tag_name:, created_user: current_user, updated_user: current_user)
+    if page.save
       message = params[:message].presence
-
+      Wiki::Commit.content!(page:, body:, created_user: current_user, message:)
-    return head :unprocessable_entity if title.blank? || body.blank?
-
-    tag_name = TagName.find_undiscard_or_create_by!(name: title)
-
-    page =
-        Wiki::Commit.create_content!(
-            tag_name:,
-            body:,
-            created_by_user: current_user,
-            message:)
 
       render json: WikiPageRepr.base(page), status: :created
-  rescue ActiveRecord::RecordInvalid, ActiveRecord::RecordNotUnique
+    else
-    head :unprocessable_entity
+      render json: { errors: page.errors.full_messages },
+             status: :unprocessable_entity
+    end
   end
 
   def update
@@ -115,21 +113,12 @@ class WikiPagesController < ApplicationController
     return head :unprocessable_entity if title.blank? || body.blank?
 
     page = WikiPage.find(params[:id])
-    base_revision_id = params[:base_revision_id].presence
+    base_revision_id = page.current_revision.id
 
-    ApplicationRecord.transaction do
+    if params[:title].present? && params[:title].strip != page.title
-      page.lock!
+      return head :unprocessable_entity
-
-      old_title = page.title
-
-      tag = Tag.find_by(tag_name_id: page.tag_name_id)
-
-      if tag && title != old_title
-        TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
     end
 
-      page.tag_name.update!(name: title) if title != old_title
-
     message = params[:message].presence
     Wiki::Commit.content!(page:,
                           body:,
@@ -137,12 +126,6 @@ class WikiPagesController < ApplicationController
                           message:,
                           base_revision_id:)
 
-      if tag && title != old_title
-        tag.reload
-        TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
-      end
-    end
-
     head :ok
   end
 

backend/app/models/ip_address.rb

@@ -2,6 +2,5 @@ class IpAddress < ApplicationRecord
   validates :ip_address, presence: true, length: { maximum: 16 }
   validates :banned, inclusion: { in: [true, false] }
 
-  has_many :user_ips, dependent: :destroy
+  has_many :users
-  has_many :users, through: :user_ips
 end

backend/app/models/material.rb

@@ -1,39 +0,0 @@
-class Material < ApplicationRecord
-  include MyDiscard
-
-  default_scope -> { kept }
-
-  belongs_to :parent, class_name: 'Material', optional: true
-  has_many :children, class_name: 'Material', foreign_key: :parent_id, dependent: :nullify
-
-  belongs_to :tag, optional: true
-  belongs_to :created_by_user, class_name: 'User', optional: true
-  belongs_to :updated_by_user, class_name: 'User', optional: true
-
-  has_one_attached :file, dependent: :purge
-
-  validates :tag_id, presence: true, uniqueness: true
-
-  validate :file_must_be_attached
-  validate :tag_must_be_material_category
-
-  def content_type
-    return nil unless file&.attached?
-
-    file.blob.content_type
-  end
-
-  private
-
-  def file_must_be_attached
-    return if url.present? || file.attached?
-
-    errors.add(:url, 'URL かファイルのどちらかは必須です．')
-  end
-
-  def tag_must_be_material_category
-    return if tag.blank? || tag.character? || tag.material?
-
-    errors.add(:tag, '素材カテゴリのタグを指定してください．')
-  end
-end

backend/app/models/my_discard.rb

@@ -1,24 +0,0 @@
-module MyDiscard
-  extend ActiveSupport::Concern
-
-  included do
-    include Discard::Model
-
-    default_scope -> { kept }
-  end
-
-  class_methods do
-    def find_undiscard_or_create_by! attrs, &block
-      record = with_discarded.find_by(attrs)
-
-      if record&.discarded?
-        record.undiscard!
-        record.update_columns(created_at: record.reload.updated_at)
-      end
-
-      record or create!(attrs, &block)
-    rescue ActiveRecord::RecordNotUnique
-      retry
-    end
-  end
-end

backend/app/models/nico_tag_version.rb

@@ -1,7 +0,0 @@
-class NicoTagVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :tag
-
-  validates :name, presence: true
-end

backend/app/models/post.rb

@@ -11,7 +11,6 @@ class Post < ApplicationRecord
 
   has_many :user_post_views, dependent: :delete_all
   has_many :post_similarities, dependent: :delete_all
-  has_many :post_versions
 
   has_one_attached :thumbnail
 
@@ -31,8 +30,6 @@ class Post < ApplicationRecord
     super(options).merge(thumbnail: nil)
   end
 
-  def snapshot_tag_names = tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-
   def related limit: nil
     ids = post_similarities.order(cos: :desc)
     ids = ids.limit(limit) if limit

backend/app/models/post_version.rb

@@ -1,22 +0,0 @@
-class PostVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :post
-  belongs_to :parent, class_name: 'Post', optional: true
-
-  validates :url, presence: true
-
-  validate :validate_original_created_range
-
-  private
-
-  def validate_original_created_range
-    f = original_created_from
-    b = original_created_before
-    return if f.blank? || b.blank?
-
-    if f >= b
-      errors.add :original_created_before, 'オリジナルの作成日時の順番がをかしぃです．'
-    end
-  end
-end

backend/app/models/tag.rb

@@ -1,9 +1,4 @@
-require 'set'
-
-
 class Tag < ApplicationRecord
-  include MyDiscard
-
   class NicoTagNormalisationError < ArgumentError
     ;
   end
@@ -32,10 +27,6 @@ class Tag < ApplicationRecord
            class_name: 'TagSimilarity', foreign_key: :target_tag_id, dependent: :delete_all
 
   has_many :deerjikists, dependent: :delete_all
-  has_many :materials
-
-  has_many :tag_versions
-  has_many :nico_tag_versions
 
   belongs_to :tag_name
   delegate :wiki_page, to: :tag_name
@@ -77,17 +68,27 @@ class Tag < ApplicationRecord
 
   def has_wiki = wiki_page.present?
 
-  def material_id = materials.first&.id
+  def self.tagme
+    @tagme ||= find_or_create_by_tag_name!('タグ希望', category: :meta)
+  end
 
-  def self.tagme = find_or_create_by_tag_name!('タグ希望', category: :meta)
+  def self.bot
-  def self.bot = find_or_create_by_tag_name!('bot操作', category: :meta)
+    @bot ||= find_or_create_by_tag_name!('bot操作', category: :meta)
-  def self.no_deerjikist = find_or_create_by_tag_name!('ニジラー情報不詳', category: :meta)
+  end
-  def self.video = find_or_create_by_tag_name!('動画', category: :meta)
-  def self.niconico = find_or_create_by_tag_name!('ニコニコ', category: :meta)
 
-  def self.normalise_tags tag_names, with_tagme: true,
+  def self.no_deerjikist
-                                     with_no_deerjikist: true,
+    @no_deerjikist ||= find_or_create_by_tag_name!('ニジラー情報不詳', category: :meta)
-                                     deny_nico: true
+  end
+
+  def self.video
+    @video ||= find_or_create_by_tag_name!('動画', category: :meta)
+  end
+
+  def self.niconico
+    @niconico ||= find_or_create_by_tag_name!('ニコニコ', category: :meta)
+  end
+
+  def self.normalise_tags tag_names, with_tagme: true, deny_nico: true
     if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end
@@ -101,7 +102,7 @@ class Tag < ApplicationRecord
     end
 
     tags << Tag.tagme if with_tagme && tags.size < 10 && tags.none?(Tag.tagme)
-    tags << Tag.no_deerjikist if with_no_deerjikist && tags.all? { |t| !(t.deerjikist?) }
+    tags << Tag.no_deerjikist if tags.all? { |t| !(t.deerjikist?) }
     tags.uniq(&:id)
   end
 
@@ -129,62 +130,39 @@ class Tag < ApplicationRecord
   end
 
   def self.find_or_create_by_tag_name! name, category:
-    tn = TagName.find_undiscard_or_create_by!(name: name.to_s.strip)
+    tn = TagName.find_or_create_by!(name: name.to_s.strip)
     tn = tn.canonical if tn.canonical_id?
 
-    Tag.find_undiscard_or_create_by!(tag_name_id: tn.id) do |t|
+    Tag.find_or_create_by!(tag_name_id: tn.id) do |t|
       t.category = category
     end
   rescue ActiveRecord::RecordNotUnique
     retry
   end
 
-  def self.merge_tags! target_tag, source_tags, created_by_user: nil
+  def self.merge_tags! target_tag, source_tags
     target_tag => Tag
 
-    affected_post_ids = Set.new
-
     Tag.transaction do
-      TagVersioning.ensure_snapshot!(target_tag, created_by_user:)
+      Array(source_tags).compact.uniq.each do |st|
+        st => Tag
 
-      Array(source_tags).compact.uniq.each do |source_tag|
+        next if st == target_tag
-        source_tag => Tag
 
-        next if source_tag == target_tag
+        st.post_tags.find_each do |pt|
-
+          if PostTag.kept.exists?(post_id: pt.post_id, tag_id: target_tag.id)
-        TagVersioning.ensure_snapshot!(source_tag, created_by_user:)
+            pt.discard_by!(nil)
-
+            # discard 後の update! は禁止なので DB を直に更新
-        source_tag.post_tags.kept.find_each do |source_pt|
+            pt.update_columns(tag_id: target_tag.id, updated_at: Time.current)
-          post_id = source_pt.post_id
-          affected_post_ids << post_id
-          source_pt.discard_by!(created_by_user)
-          unless PostTag.kept.exists?(post_id:, tag: target_tag)
-            PostTag.create!(post_id:, tag: target_tag)
-          end
-        end
-
-        source_tag_name = source_tag.tag_name
-
-        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.discard!
-
-        if source_tag.nico?
-          source_tag_name.discard!
           else
-          source_tag_name.update_columns(canonical_id: target_tag.tag_name_id,
+            pt.update!(tag: target_tag)
-                                         updated_at: Time.current)
+          end
         end
 
-        TagVersioning.record!(target_tag, event_type: :update, created_by_user:)
+        tag_name = st.tag_name
-      end
+        st.destroy!
-
+        tag_name.reload
-      Post.where(id: affected_post_ids.to_a).find_each do |post|
+        tag_name.update!(canonical: target_tag.tag_name)
-        PostVersionRecorder.ensure_snapshot!(post, created_by_user:)
-        PostVersionRecorder.record!(post:, event_type: :update, created_by_user:)
       end
 
       # 投稿件数を再集計
@@ -194,14 +172,6 @@ class Tag < ApplicationRecord
     target_tag.reload
   end
 
-  def snapshot_aliases = tag_name.aliases.kept.order(:name).pluck(:name)
-
-  def snapshot_parent_tag_ids = parents.order(:id).pluck(:id)
-
-  def snapshot_linked_tag_names
-    linked_tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-  end
-
   private
 
   def nico_tag_name_must_start_with_nico

backend/app/models/tag_name.rb

@@ -1,6 +1,4 @@
 class TagName < ApplicationRecord
-  include MyDiscard
-
   has_one :tag
   has_one :wiki_page
 
@@ -12,7 +10,6 @@ class TagName < ApplicationRecord
   validate :canonical_must_be_canonical
   validate :alias_name_must_not_have_prefix
   validate :canonical_must_not_be_present_with_tag_or_wiki_page
-  validate :name_must_be_sanitised
 
   def self.canonicalise names
     names = Array(names).map { |n| n.to_s.strip }.reject(&:blank?)
@@ -42,10 +39,4 @@ class TagName < ApplicationRecord
       errors.add :canonical, 'タグもしくは Wiki の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．'
-    end
-  end
 end

backend/app/models/tag_name_sanitisation_rule.rb

@@ -1,58 +0,0 @@
-class TagNameSanitisationRule < ApplicationRecord
-  include Discard::Model
-
-  self.primary_key = :priority
-
-  default_scope -> { kept }
-
-  validates :source_pattern, presence: true, uniqueness: true
-
-  validate :source_pattern_must_be_regexp
-
-  class << self
-    def sanitise(name) =
-        rules.reduce(name.dup) { |name, (pattern, replacement)| name.gsub(pattern, replacement) }
-
-    def apply!
-      TagName.find_each do |tn|
-        name = sanitise(tn.name)
-        next if name == tn.name
-
-        TagName.transaction do
-          existing_tn = TagName.find_by(name:)
-          if existing_tn
-            existing_tn = existing_tn.canonical || existing_tn
-            next if existing_tn.id == tn.id
-
-            existing_tag = Tag.find_by(tag_name_id: existing_tn.id)
-            source_tag = Tag.find_by(tag_name_id: tn.id)
-
-            if existing_tag
-              Tag.merge_tags!(existing_tag, source_tag) if tn.tag
-            elsif source_tag
-              source_tag.update_columns(tag_name_id: existing_tn.id, updated_at: Time.current)
-            end
-            tn.discard!
-
-            next
-          end
-
-          # TagName 側の自動サニタイズを回避
-          tn.update_columns(name:, updated_at: Time.current)
-        end
-      end
-    end
-
-    private
-
-    def rules = kept.order(:priority).map { |r| [Regexp.new(r.source_pattern), r.replacement] }
-  end
-
-  private
-
-  def source_pattern_must_be_regexp
-    Regexp.new(source_pattern)
-  rescue RegexpError
-    errors.add :source_pattern, '変な正規表現だね〜（笑）'
-  end
-end

backend/app/models/tag_version.rb

@@ -1,15 +0,0 @@
-class TagVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :tag
-
-  enum :category, { deerjikist: 'deerjikist',
-                    meme: 'meme',
-                    character: 'character',
-                    general: 'general',
-                    material: 'material',
-                    meta: 'meta' }, validate: true
-
-  validates :name, presence: true
-  validates :category, presence: true
-end

backend/app/models/theatre.rb

@@ -1,13 +0,0 @@
-class Theatre < ApplicationRecord
-  include MyDiscard
-
-  has_many :comments, class_name: 'TheatreComment'
-  has_many :theatre_watching_users, dependent: :delete_all
-  has_many :active_theatre_watching_users, -> { active },
-           class_name: 'TheatreWatchingUser', inverse_of: :theatre
-  has_many :watching_users, through: :active_theatre_watching_users, source: :user
-
-  belongs_to :host_user, class_name: 'User', optional: true
-  belongs_to :current_post, class_name: 'Post', optional: true
-  belongs_to :created_by_user, class_name: 'User'
-end

backend/app/models/theatre_comment.rb

@@ -1,8 +0,0 @@
-class TheatreComment < ApplicationRecord
-  include Discard::Model
-
-  self.primary_key = :theatre_id, :no
-
-  belongs_to :theatre
-  belongs_to :user
-end

backend/app/models/theatre_watching_user.rb

@@ -1,13 +0,0 @@
-class TheatreWatchingUser < ApplicationRecord
-  self.primary_key = :theatre_id, :user_id
-
-  belongs_to :theatre
-  belongs_to :user
-
-  scope :active, -> { where('expires_at >= ?', Time.current) }
-  scope :expired, -> { where('expires_at < ?', Time.current) }
-
-  def active? = expires_at >= Time.current
-
-  def refresh! = update!(expires_at: 30.seconds.from_now)
-end

backend/app/models/version_record.rb

@@ -1,19 +0,0 @@
-module VersionRecord
-  extend ActiveSupport::Concern
-
-  def readonly? = persisted?
-
-  included do
-    belongs_to :created_by_user, class_name: 'User', optional: true
-
-    enum :event_type, { create: 'create',
-                        update: 'update',
-                        discard: 'discard',
-                        restore: 'restore' }, prefix: true, validate: true
-
-    validates :version_no, presence: true, numericality: { only_integer: true, greater_than: 0 }
-    validates :event_type, presence: true
-
-    scope :chronological, -> { order(:version_no, :id) }
-  end
-end

backend/app/models/wiki_page.rb

@@ -2,8 +2,6 @@ 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'
@@ -13,11 +11,8 @@ class WikiPage < ApplicationRecord
            foreign_key: :redirect_page_id,
            dependent: :nullify
 
-  has_many :wiki_versions
-
   belongs_to :tag_name
   validates :tag_name, presence: true
-  validates :body, presence: true
 
   def title = tag_name.name
 
@@ -27,6 +22,11 @@ class WikiPage < ApplicationRecord
 
   def current_revision = wiki_revisions.order(id: :desc).first
 
+  def body
+    rev = current_revision
+    rev.body if rev&.content?
+  end
+
   def resolve_redirect limit: 10
     page = self
     visited = Set.new

backend/app/models/wiki_version.rb

@@ -1,8 +0,0 @@
-class WikiVersion < ApplicationRecord
-  include VersionRecord
-
-  belongs_to :wiki_page
-
-  validates :title, presence: true
-  validates :body, presence: true
-end

backend/app/representations/material_repr.rb

@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-
-module MaterialRepr
-  BASE = { only: [:id, :url, :created_at, :updated_at],
-           methods: [:content_type],
-           include: { tag: TagRepr::BASE,
-                      created_by_user: UserRepr::BASE,
-                      updated_by_user: UserRepr::BASE } }.freeze
-
-  module_function
-
-  def base material, host:
-    material.as_json(BASE).merge(
-        file: if material.file.attached?
-                Rails.application.routes.url_helpers.rails_storage_proxy_url(
-                    material.file, host:)
-              end)
-  end
-
-  def many materials, host:
-    materials.map { |m| base(m, host:) }
-  end
-end

backend/app/representations/post_repr.rb

@@ -2,19 +2,15 @@
 
 
 module PostRepr
-  BASE = { include: { tags: TagRepr::BASE, uploaded_user: UserRepr::BASE } }.freeze
+  BASE = { include: { tags: TagRepr::BASE } }.freeze
 
   module_function
 
-  def base post, current_user = nil
+  def base post
-    json = post.as_json(BASE)
+    post.as_json(BASE)
-    return json.merge(viewed: false) unless current_user
-
-    viewed = current_user.viewed?(post)
-    json.merge(viewed:)
   end
 
-  def many posts, current_user = nil
+  def many posts
-    posts.map { |p| base(p, current_user) }
+    posts.map { |p| base(p) }
   end
 end

backend/app/representations/tag_repr.rb

@@ -2,15 +2,15 @@
 
 
 module TagRepr
-  BASE = { only: [:id, :category, :post_count, :created_at, :updated_at],
+  BASE = { only: [:id, :category, :post_count], methods: [:name, :has_wiki] }.freeze
-           methods: [:name, :has_wiki, :material_id] }.freeze
 
   module_function
 
   def base tag
-    tag.as_json(BASE).merge(aliases: tag.snapshot_aliases,
+    tag.as_json(BASE)
-                            parents: tag.parents.map { _1.as_json(BASE) })
   end
 
-  def many(tags) = tags.map { |t| base(t) }
+  def many tags
+    tags.map { |t| base(t) }
+  end
 end

backend/app/representations/theatre_repr.rb

@@ -1,17 +0,0 @@
-# frozen_string_literal: true
-
-
-module TheatreRepr
-  BASE = { only: [:id, :name, :opens_at, :closes_at, :created_at, :updated_at],
-           include: { created_by_user: { only: [:id, :name] } } }.freeze
-
-  module_function
-
-  def base theatre
-    theatre.as_json(BASE)
-  end
-
-  def many theatre
-    theatre.map { |t| base(t) }
-  end
-end

backend/app/representations/user_repr.rb

@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-
-module UserRepr
-  BASE = { only: [:id, :name] }.freeze
-
-  module_function
-
-  def base user
-    user.as_json(BASE)
-  end
-
-  def many users
-    users.map { |u| base(u) }
-  end
-end

backend/app/services/nico_tag_version_recorder.rb

@@ -1,19 +0,0 @@
-class NicoTagVersionRecorder < VersionRecorder
-  def self.record! tag:, event_type:, created_by_user:
-    new(tag:, event_type:, created_by_user:).record!
-  end
-
-  def initialize tag:, event_type:, created_by_user:
-    super(record: tag, event_type:, created_by_user:)
-  end
-
-  private
-
-  def version_class = NicoTagVersion
-  def version_association = :nico_tag_versions
-  def record_key = :tag
-
-  def snapshot_attributes
-    { name: @record.name, linked_tags: @record.snapshot_linked_tag_names.join(' ') }
-  end
-end

backend/app/services/post_version_recorder.rb

@@ -1,31 +0,0 @@
-class PostVersionRecorder < VersionRecorder
-  def self.record! post:, event_type:, created_by_user:
-    new(post:, event_type:, created_by_user:).record!
-  end
-
-  def initialize post:, event_type:, created_by_user:
-    super(record: post, event_type:, created_by_user:)
-  end
-
-  def self.ensure_snapshot! post, created_by_user:
-    return if post.post_versions.exists?
-
-    record!(post:, event_type: :create, created_by_user:)
-  end
-
-  private
-
-  def version_class = PostVersion
-  def version_association = :post_versions
-  def record_key = :post
-
-  def snapshot_attributes
-    { title: @record.title,
-      url: @record.url,
-      thumbnail_base: @record.thumbnail_base,
-      tags: @record.snapshot_tag_names.join(' '),
-      parent_id: @record.parent_id,
-      original_created_from: @record.original_created_from,
-      original_created_before: @record.original_created_before }
-  end
-end

backend/app/services/tag_version_recorder.rb

@@ -1,22 +0,0 @@
-class TagVersionRecorder < VersionRecorder
-  def self.record! tag:, event_type:, created_by_user:
-    new(tag:, event_type:, created_by_user:).record!
-  end
-
-  def initialize tag:, event_type:, created_by_user:
-    super(record: tag, event_type:, created_by_user:)
-  end
-
-  private
-
-  def version_class = TagVersion
-  def version_association = :tag_versions
-  def record_key = :tag
-
-  def snapshot_attributes
-    { name: @record.name,
-      category: @record.category,
-      aliases: @record.snapshot_aliases.join(' '),
-      parent_tag_ids: @record.snapshot_parent_tag_ids.join(' ') }
-  end
-end

backend/app/services/tag_versioning.rb

@@ -1,38 +0,0 @@
-class TagVersioning
-  def self.record! tag, event_type:, created_by_user:
-    if tag.nico?
-      NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-    else
-      TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-    end
-  end
-
-  def self.ensure_snapshot! tag, created_by_user:
-    if tag.nico?
-      return if tag.nico_tag_versions.exists?
-
-      NicoTagVersionRecorder.record!(tag:, event_type: :create, created_by_user:)
-    else
-      return if tag.tag_versions.exists?
-
-      TagVersionRecorder.record!(tag:, event_type: :create, created_by_user:)
-    end
-  end
-
-  def self.record_tag_snapshot! tag, created_by_user:
-    event_type =
-        if tag.nico?
-          tag.nico_tag_versions.exists? ? :update : :create
-        else
-          tag.tag_versions.exists? ? :update : :create
-        end
-
-    record!(tag, event_type:, created_by_user:)
-  end
-
-  def self.record_tag_snapshots! tags, created_by_user:
-    tags.each do |tag|
-      record_tag_snapshot!(tag, created_by_user:)
-    end
-  end
-end

backend/app/services/version_recorder.rb

@@ -1,62 +0,0 @@
-class VersionRecorder
-  EVENT_TYPES = ['create', 'update', 'discard', 'restore'].freeze
-
-  def initialize record:, event_type:, created_by_user:
-    @record = record
-    @event_type = event_type.to_s
-    @created_by_user = created_by_user
-
-    validate_event_type!
-  end
-
-  def record!
-    raise "#{ record_class.name } must be persisted" unless @record.persisted?
-
-    ApplicationRecord.transaction do
-      @record = record_class.unscoped.lock.find(@record.id)
-      latest = latest_version
-
-      if !(latest) && @event_type != 'create'
-        raise "#{ version_class.name } first event must be create"
-      end
-
-      if @event_type == 'create' && latest
-        raise "#{ version_class.name } create event already exists"
-      end
-
-      attrs = snapshot_attributes
-
-      return latest if @event_type == 'update' && latest && same_snapshot?(latest, attrs)
-
-      version_class.create!(base_attributes(latest).merge(record_key => @record).merge(attrs))
-    end
-  end
-
-  private
-
-  def latest_version = versions.order(version_no: :desc).first
-
-  def versions = @record.public_send(version_association)
-
-  def base_attributes latest
-    { version_no: (latest&.version_no || 0) + 1,
-      event_type: @event_type,
-      created_at: Time.current,
-      created_by_user: @created_by_user }
-  end
-
-  def same_snapshot?(version, attrs) = attrs.all? { |k, v| version.public_send(k) == v }
-
-  def validate_event_type!
-    return if EVENT_TYPES.include?(@event_type)
-
-    raise ArgumentError, "Invalid event_type: #{ @event_type }"
-  end
-
-  def version_class = raise NotImplementedError
-  def version_association = raise NotImplementedError
-  def record_key = raise NotImplementedError
-  def snapshot_attributes = raise NotImplementedError
-
-  def record_class = @record.class
-end

backend/app/services/wiki/commit.rb

@@ -7,31 +7,6 @@ module Wiki
       ;
     end
 
-    def self.create_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
       new(page:, created_user:).content!(body:, message:, base_revision_id:)
     end
@@ -46,12 +21,7 @@ module Wiki
     end
 
     def content! body:, message:, base_revision_id:
-      normalised = self.class.normalise_body(body)
+      normalised = 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) }
@@ -67,19 +37,10 @@ module Wiki
           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" +
+                "競合が発生してゐます（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
-                "（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
           end
         end
 
-        @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:,
@@ -93,45 +54,65 @@ module Wiki
         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?
+        WikiRevisionLine.insert_all!(rows)
 
         rev
       end
     end
 
-    def redirect!(redirect_page:, message:, base_revision_id:) = raise '廃止しました．'
+    def redirect! redirect_page:, message:, base_revision_id:
+      ActiveRecord::Base.transaction do
+        @page.lock!
 
-    def self.normalise_body body
+        if base_revision_id.present?
-      s = body.to_s
+          current_id = @page.wiki_revisions.maximum(:id)
-      s.gsub!(/\r\n?/, "\n")
+          if current_id && current_id != base_revision_id.to_i
-      s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
+            raise Conflict,
-      s.gsub(/\n+$/, '')
+                "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
+
+        WikiRevision.create!(
+            wiki_page:        @page,
+            base_revision_id:,
+            created_user:     @created_user,
+            kind:             :redirect,
+            redirect_page:,
+            message:,
+            lines_count:      0,
+            tree_sha256:      nil)
+      end
     end
 
     private
 
-    def split_lines(body) = body.split("\n")
+    def normalise_body body
+      s = body.to_s
+      s.gsub!("\r\n", "\n")
+      s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
+    end
+
+    def split_lines body
+      body.split("\n")
+    end
 
     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 = { }
+      missing_rows = []
-
       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] = {
+        missing_rows << { sha256:     sha,
-            sha256:     sha,
                           body:       lines[i],
                           created_at: now,
                           updated_at: now }
       end
 
-      if missing_by_sha.any?
+      if missing_rows.any?
-        WikiLine.upsert_all(missing_by_sha.values)
+        WikiLine.upsert_all(missing_rows)
         id_by_sha = WikiLine.where(sha256: line_shas).pluck(:sha256, :id).to_h
       end
 

backend/app/services/wiki_version_recorder.rb

@@ -1,21 +0,0 @@
-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/config/environments/production.rb

@@ -18,7 +18,8 @@ Rails.application.configure do
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.asset_host = "http://assets.example.com"
 
-  config.active_storage.service = :r2
+  # Store uploaded files on the local file system (see config/storage.yml for options).
+  config.active_storage.service = :local
 
   # Assume all access to the app is happening through a SSL-terminating reverse proxy.
   config.assume_ssl = true

backend/config/environments/test.rb

@@ -50,6 +50,4 @@ Rails.application.configure do
 
   # Raise error when a before_action's only/except options reference missing actions.
   config.action_controller.raise_on_missing_callback_actions = true
-
-  Rails.application.routes.default_url_options[:host] = 'www.example.com'
 end

backend/config/routes.rb

@@ -6,23 +6,17 @@ Rails.application.routes.draw do
     delete ':child_id', action: :destroy
   end
 
-  resources :tags, only: [:index, :show] do
+  resources :tags, only: [:index, :show, :update] do
     collection do
       get :autocomplete
-      get :'with-depth', action: :with_depth
-      get :versions, to: 'tag_versions#index'
 
       scope :name do
         get ':name/deerjikists', action: :deerjikists_by_name
-        get ':name/materials', action: :materials_by_name
         get ':name', action: :show_by_name
       end
     end
 
     member do
-      put '', action: :update_all
-      patch '', action: :update
-
       get :deerjikists
     end
   end
@@ -53,7 +47,6 @@ Rails.application.routes.draw do
     collection do
       get :random
       get :changes
-      get :versions, to: 'post_versions#index'
     end
 
     member do
@@ -79,15 +72,4 @@ Rails.application.routes.draw do
       end
     end
   end
-
-  resources :theatres, only: [:show] do
-    member do
-      put :watching
-      patch :next_post
-    end
-
-    resources :comments, controller: :theatre_comments, only: [:index, :create]
-  end
-
-  resources :materials, only: [:index, :show, :create, :update, :destroy]
 end

backend/config/schedule.rb

@@ -1,19 +1,12 @@
 env :PATH, '/root/.rbenv/shims:/root/.rbenv/bin:/usr/local/bin:/usr/bin:/bin'
 
-set :path, '/var/www/btrc-hub/backend'
-set :environment, 'production'
 set :output, standard: '/var/log/btrc_hub_nico_sync.log',
              error:    '/var/log/btrc_hub_nico_sync_err.log'
 
-job_type :rake,
+every 1.day, at: '3:00 pm' do
-         'cd :path && set -a && . /etc/btrc-hub/backend.env && set +a && ' \
-         ':environment_variable=:environment bundle exec rake :task --silent :output'
-
-every 1.day, at: '11:00 am' do
   rake 'nico:sync', environment: 'production'
 end
 
 every 1.day, at: '0:00 am' do
   rake 'post_similarity:calc', environment: 'production'
-  rake 'tag_similarity:calc', environment: 'production'
 end

backend/config/storage.yml

@@ -6,11 +6,29 @@ local:
   service: Disk
   root: <%= Rails.root.join("storage") %>
 
-r2:
+# Use bin/rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
-  service: S3
+# amazon:
-  endpoint: <%= ENV['R2_ENDPOINT'] %>
+#   service: S3
-  access_key_id: <%= ENV['R2_ACCESS_KEY_ID'] %>
+#   access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
-  secret_access_key: <%= ENV['R2_SECRET_ACCESS_KEY'] %>
+#   secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
-  bucket: <%= ENV['R2_BUCKET'] %>
+#   region: us-east-1
-  region: auto
+#   bucket: your_own_bucket-<%= Rails.env %>
-  request_checksum_calculation: when_required
+
+# Remember not to checkin your GCS keyfile to a repository
+# google:
+#   service: GCS
+#   project: your_project
+#   credentials: <%= Rails.root.join("path/to/gcs.keyfile") %>
+#   bucket: your_own_bucket-<%= Rails.env %>
+
+# Use bin/rails credentials:edit to set the Azure Storage secret (as azure_storage:storage_access_key)
+# microsoft:
+#   service: AzureStorage
+#   storage_account_name: your_account_name
+#   storage_access_key: <%= Rails.application.credentials.dig(:azure_storage, :storage_access_key) %>
+#   container: your_container_name-<%= Rails.env %>
+
+# mirror:
+#   service: Mirror
+#   primary: local
+#   mirrors: [ amazon, google, microsoft ]

backend/db/migrate/20260309123200_create_tag_name_sanitisation_rules.rb

@@ -1,31 +0,0 @@
-class CreateTagNameSanitisationRules < ActiveRecord::Migration[8.0]
-  def up
-    create_table :tag_name_sanitisation_rules, id: :integer, primary_key: :priority do |t|
-      t.string :source_pattern, null: false
-      t.string :replacement, null: false
-      t.timestamps
-      t.datetime :discarded_at
-      t.index :source_pattern, unique: true
-      t.index :discarded_at
-    end
-
-    now = ActiveRecord::Base.connection.quote(Time.current)
-    execute <<~SQL
-      INSERT INTO
-        tag_name_sanitisation_rules(priority, source_pattern, replacement, created_at, updated_at)
-      VALUES
-        (10, '\\\\*',           '_',         #{ now }, #{ now })
-      , (20, '\\\\?',           '_',         #{ now }, #{ now })
-      , (25, '\\\\/',           '_',         #{ now }, #{ now })
-      , (30, '_+',              '_',         #{ now }, #{ now })
-      , (40, '_$',              '',          #{ now }, #{ now })
-      , (45, '^([^:]+\\\\:)?_', '\\\\1',     #{ now }, #{ now })
-      , (50, '^([^:]+\\\\:)?$', '\\\\1null', #{ now }, #{ now })
-      ;
-    SQL
-  end
-
-  def down
-    drop_table :tag_name_sanitisation_rules
-  end
-end

backend/db/migrate/20260311123100_add_discarded_at_to_tags.rb

@@ -1,6 +0,0 @@
-class AddDiscardedAtToTags < ActiveRecord::Migration[8.0]
-  def change
-    add_column :tags, :discarded_at, :datetime
-    add_index :tags, :discarded_at
-  end
-end

backend/db/migrate/20260311232100_add_discarded_at_to_tag_names.rb

@@ -1,6 +0,0 @@
-class AddDiscardedAtToTagNames < ActiveRecord::Migration[8.0]
-  def change
-    add_column :tag_names, :discarded_at, :datetime
-    add_index :tag_names, :discarded_at
-  end
-end

backend/db/migrate/20260311232300_add_discarded_at_to_wiki_pages.rb

@@ -1,6 +0,0 @@
-class AddDiscardedAtToWikiPages < ActiveRecord::Migration[8.0]
-  def change
-    add_column :wiki_pages, :discarded_at, :datetime
-    add_index :wiki_pages, :discarded_at
-  end
-end

backend/db/migrate/20260316082500_create_theatres.rb

@@ -1,17 +0,0 @@
-class CreateTheatres < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatres do |t|
-      t.string :name
-      t.datetime :opens_at, null: false, index: true
-      t.datetime :closes_at, index: true
-      t.integer :kind, null: false, index: true
-      t.references :current_post, foreign_key: { to_table: :posts }, index: true
-      t.datetime :current_post_started_at
-      t.integer :next_comment_no, null: false, default: 1
-      t.references :host_user, foreign_key: { to_table: :users }
-      t.references :created_by_user, null: false, foreign_key: { to_table: :users }, index: true
-      t.timestamps
-      t.datetime :discarded_at, index: true
-    end
-  end
-end

backend/db/migrate/20260316083500_create_theatre_comments.rb

@@ -1,12 +0,0 @@
-class CreateTheatreComments < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatre_comments, primary_key: [:theatre_id, :no] do |t|
-      t.references :theatre, null: false, foreign_key: { to_table: :theatres }
-      t.integer :no, null: false
-      t.references :user, foreign_key: { to_table: :users }
-      t.text :content, null: false
-      t.timestamps
-      t.datetime :discarded_at, index: true
-    end
-  end
-end

backend/db/migrate/20260317015000_create_theatre_watching_users.rb

@@ -1,12 +0,0 @@
-class CreateTheatreWatchingUsers < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatre_watching_users, primary_key: [:theatre_id, :user_id] do |t|
-      t.references :theatre, null: false, foreign_key: { to_table: :theatres }
-      t.references :user, null: false, foreign_key: { to_table: :users }, index: true
-      t.datetime :expires_at, null: false, index: true
-      t.timestamps
-
-      t.index [:theatre_id, :expires_at]
-    end
-  end
-end

backend/db/migrate/20260329034700_create_materials.rb

@@ -1,34 +0,0 @@
-class CreateMaterials < ActiveRecord::Migration[8.0]
-  def change
-    create_table :materials do |t|
-      t.string :url
-      t.references :parent, index: true, foreign_key: { to_table: :materials }
-      t.references :tag, index: true, foreign_key: true
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.references :updated_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-      t.datetime :discarded_at, index: true
-      t.virtual :active_url, type: :string,
-                             as: 'IF(discarded_at IS NULL, url, NULL)',
-                             stored: false
-
-      t.index :active_url, unique: true
-    end
-
-    create_table :material_versions do |t|
-      t.references :material, null: false, foreign_key: true
-      t.integer :version_no, null: false
-      t.string :url, index: true
-      t.references :parent, index: true, foreign_key: { to_table: :materials }
-      t.references :tag, index: true, foreign_key: true
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.references :updated_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-      t.datetime :discarded_at, index: true
-
-      t.index [:material_id, :version_no],
-              unique: true,
-              name: 'index_material_versions_on_material_id_and_version_no'
-    end
-  end
-end

backend/db/migrate/20260409123700_create_post_versions.rb

@@ -1,203 +0,0 @@
-require 'set'
-
-
-class CreatePostVersions < ActiveRecord::Migration[8.0]
-  class Post < ActiveRecord::Base
-    self.table_name = 'posts'
-  end
-
-  class PostTag < ActiveRecord::Base
-    self.table_name = 'post_tags'
-  end
-
-  class PostVersion < ActiveRecord::Base
-    self.table_name = 'post_versions'
-  end
-
-  def up
-    create_table :post_versions do |t|
-      t.references :post, null: false, foreign_key: true
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :title
-      t.string :url, limit: 768, null: false
-      t.string :thumbnail_base, limit: 2000
-      t.text :tags, null: false
-      t.references :parent, foreign_key: { to_table: :posts }
-      t.datetime :original_created_from
-      t.datetime :original_created_before
-      t.datetime :created_at, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }
-
-      t.index [:post_id, :version_no], unique: true
-      t.check_constraint 'version_no > 0',
-                         name: 'post_versions_version_no_positive'
-      t.check_constraint "event_type IN ('create', 'update', 'discard', 'restore')",
-                         name: 'post_versions_event_type_valid'
-    end
-
-    PostVersion.reset_column_information
-
-    say_with_time 'Backfilling post_versions' do
-      Post.find_in_batches(batch_size: 500) do |posts|
-        post_ids = posts.map(&:id)
-
-        post_tag_rows_by_post_id =
-            PostTag
-            .joins('INNER JOIN tags ON tags.id = post_tags.tag_id')
-            .joins('INNER JOIN tag_names ON tag_names.id = tags.tag_name_id')
-            .where(post_id: post_ids)
-            .pluck('post_tags.post_id',
-                   'post_tags.created_at',
-                   'post_tags.discarded_at',
-                   'post_tags.created_user_id',
-                   'post_tags.deleted_user_id',
-                   'tag_names.name')
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              post_id, created_at, discarded_at, created_user_id, deleted_user_id, tag_name = row
-              h[post_id] << { created_at:,
-                              discarded_at:,
-                              created_user_id:,
-                              deleted_user_id:,
-                              tag_name: }
-            end
-
-        rows = []
-
-        posts.each do |post|
-          post_tag_rows = post_tag_rows_by_post_id[post.id]
-
-          events = post_tag_rows.flat_map do |post_tag_row|
-            ary = [[post_tag_row[:created_at],
-                    post_tag_row[:created_user_id],
-                    :add,
-                    post_tag_row[:tag_name]]]
-
-            if post_tag_row[:discarded_at]
-              ary << [post_tag_row[:discarded_at],
-                      post_tag_row[:deleted_user_id],
-                      :remove,
-                      post_tag_row[:tag_name]]
-            end
-
-            ary
-          end
-
-          kind_order = { add: 0, remove: 1 }
-
-          events.sort_by! do |event_at, user_id, kind, tag_name|
-            [event_at, user_id || 0, kind_order.fetch(kind), tag_name]
-          end
-
-          event_buckets = bucket_events(events)
-
-          active_tags = Set.new
-          version_no = 0
-
-          if event_buckets.empty?
-            version_no += 1
-            rows << build_row(post:,
-                              version_no:,
-                              event_type: 'create',
-                              created_at: post.created_at,
-                              created_by_user_id: post.uploaded_user_id,
-                              tags: [])
-            next
-          end
-
-          first_bucket = event_buckets.first
-          merge_first_bucket_into_create = first_bucket[:first_at] <= post.created_at + 1.second
-
-          if merge_first_bucket_into_create
-            event_buckets.shift
-            apply_bucket!(active_tags, first_bucket)
-
-            version_no += 1
-            rows << build_row(
-                post:,
-                version_no:,
-                event_type: 'create',
-                created_at: post.created_at,
-                created_by_user_id: post.uploaded_user_id || first_bucket[:user_ids].compact.first,
-                tags: active_tags.to_a.sort)
-          else
-            version_no += 1
-            rows << build_row(
-                post:,
-                version_no:,
-                event_type: 'create',
-                created_at: post.created_at,
-                created_by_user_id: post.uploaded_user_id,
-                tags: [])
-          end
-
-          event_buckets.each do |bucket|
-            apply_bucket!(active_tags, bucket)
-
-            version_no += 1
-            rows << build_row(
-                post:,
-                version_no:,
-                event_type: 'update',
-                created_at: bucket[:first_at],
-                created_by_user_id: bucket[:user_ids].compact.first,
-                tags: active_tags.to_a.sort)
-          end
-        end
-
-        PostVersion.insert_all!(rows) if rows.any?
-      end
-    end
-  end
-
-  def down
-    drop_table :post_versions
-  end
-
-  private
-
-  def bucket_events events
-    buckets = []
-
-    events.each do |event_at, user_id, kind, tag_name|
-      if buckets.empty? || event_at - buckets.last[:last_at] > 1.second
-        buckets << { first_at: event_at,
-                     last_at: event_at,
-                     user_ids: [user_id],
-                     events: [[kind, tag_name]] }
-      else
-        bucket = buckets.last
-        bucket[:last_at] = event_at
-        bucket[:user_ids] << user_id
-        bucket[:events] << [kind, tag_name]
-      end
-    end
-
-    buckets
-  end
-
-  def apply_bucket! active_tags, bucket
-    bucket[:events].each do |kind, tag_name|
-      if kind == :add
-        active_tags.add(tag_name)
-      else
-        active_tags.delete(tag_name)
-      end
-    end
-  end
-
-  def build_row post:, version_no:, event_type:, created_at:, created_by_user_id:, tags:
-    { post_id: post.id,
-      version_no:,
-      event_type:,
-      title: post.title,
-      url: post.url,
-      thumbnail_base: post.thumbnail_base,
-      tags: tags.join(' '),
-      parent_id: post.parent_id,
-      original_created_from: post.original_created_from,
-      original_created_before: post.original_created_before,
-      created_at:,
-      created_by_user_id: }
-  end
-end

backend/db/migrate/20260419035400_create_tag_versions.rb

@@ -1,156 +0,0 @@
-class CreateTagVersions < ActiveRecord::Migration[8.0]
-  class Tag < ActiveRecord::Base
-    self.table_name = 'tags'
-  end
-
-  class TagName < ActiveRecord::Base
-    self.table_name = 'tag_names'
-  end
-
-  class TagImplication < ActiveRecord::Base
-    self.table_name = 'tag_implications'
-  end
-
-  class TagVersion < ActiveRecord::Base
-    self.table_name = 'tag_versions'
-  end
-
-  class NicoTagVersion < ActiveRecord::Base
-    self.table_name = 'nico_tag_versions'
-  end
-
-  class NicoTagRelation < ActiveRecord::Base
-    self.table_name = 'nico_tag_relations'
-  end
-
-  def up
-    create_table :tag_versions do |t|
-      t.references :tag, null: false, foreign_key: true, index: false
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :name, null: false
-      t.string :category, null: false
-      t.text :aliases, null: false
-      t.text :parent_tag_ids, null: false
-      t.datetime :created_at, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }, index: false
-
-      t.index [:tag_id, :version_no], unique: true
-      t.index :created_at
-      t.index [:tag_id, :created_at], order: { created_at: :desc }
-      t.index [:created_by_user_id, :created_at], order: { created_at: :desc }
-      t.check_constraint 'version_no > 0',
-                         name: 'tag_versions_version_no_positive'
-    end
-
-    create_table :nico_tag_versions do |t|
-      t.references :tag, null: false, foreign_key: true, index: false
-      t.integer :version_no, null: false
-      t.string :event_type, null: false
-      t.string :name, null: false
-      t.text :linked_tags, null: false
-      t.datetime :created_at, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }, index: false
-
-      t.index [:tag_id, :version_no], unique: true
-      t.index :created_at
-      t.index [:tag_id, :created_at], order: { created_at: :desc }
-      t.index [:created_by_user_id, :created_at], order: { created_at: :desc }
-      t.check_constraint 'version_no > 0',
-                         name: 'nico_tag_versions_version_no_positive'
-    end
-
-    TagVersion.reset_column_information
-    say_with_time 'Backfilling tag_versions' do
-      Tag.where(discarded_at: nil)
-         .where.not(category: 'nico')
-         .find_in_batches(batch_size: 500) do |tags|
-        tag_ids = tags.map(&:id)
-
-        tag_implication_rows_by_tag_id =
-            TagImplication
-            .where(tag_id: tag_ids)
-            .pluck(:tag_id, :parent_tag_id)
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              h[row[0]] << row[1]
-            end
-
-        tag_name_rows_by_tag_id =
-            TagName
-            .joins('INNER JOIN tags ON tags.tag_name_id = tag_names.id')
-            .where(tags: { id: tag_ids })
-            .pluck('tags.id', 'tag_names.name')
-            .each_with_object({ }) do |row, h|
-              h[row[0]] = row[1]
-            end
-
-        tag_alias_rows_by_tag_id =
-            TagName
-            .joins('INNER JOIN tags ON tags.tag_name_id = tag_names.canonical_id')
-            .where(tags: { id: tag_ids })
-            .where(tag_names: { discarded_at: nil })
-            .pluck('tags.id', 'tag_names.name')
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              h[row[0]] << row[1]
-            end
-
-        TagVersion.insert_all(tags.map { |tag|
-          { tag_id: tag.id,
-            version_no: 1,
-            event_type: 'create',
-            name: tag_name_rows_by_tag_id[tag.id],
-            category: tag.category,
-            aliases: tag_alias_rows_by_tag_id[tag.id].sort.join(' '),
-            parent_tag_ids: tag_implication_rows_by_tag_id[tag.id].sort.join(' '),
-            created_at: tag.created_at,
-            created_by_user_id: nil }
-        })
-      end
-    end
-
-    NicoTagVersion.reset_column_information
-    say_with_time 'Backfilling nico_tag_versions' do
-      Tag.where(discarded_at: nil, category: 'nico')
-         .find_in_batches(batch_size: 500) do |tags|
-        tag_ids = tags.map(&:id)
-
-        tag_name_rows_by_tag_id =
-            TagName
-            .joins('INNER JOIN tags ON tags.tag_name_id = tag_names.id')
-            .where(tags: { id: tag_ids })
-            .pluck('tags.id', 'tag_names.name')
-            .each_with_object({ }) do |row, h|
-              h[row[0]] = row[1]
-            end
-
-        nico_tag_relation_rows_by_tag_id =
-            NicoTagRelation
-            .joins('INNER JOIN tags nico_tags ON nico_tags.id = nico_tag_relations.nico_tag_id')
-            .joins('INNER JOIN tags linked_tags ON linked_tags.id = nico_tag_relations.tag_id')
-            .joins('INNER JOIN tag_names ON tag_names.id = linked_tags.tag_name_id')
-            .where(nico_tags: { id: tag_ids })
-            .where(linked_tags: { discarded_at: nil })
-            .where(tag_names: { discarded_at: nil })
-            .pluck('nico_tags.id', 'tag_names.name')
-            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |row, h|
-              h[row[0]] << row[1]
-            end
-
-        NicoTagVersion.insert_all(tags.map { |tag|
-          { tag_id: tag.id,
-            version_no: 1,
-            event_type: 'create',
-            name: tag_name_rows_by_tag_id[tag.id],
-            linked_tags: nico_tag_relation_rows_by_tag_id[tag.id].sort.join(' '),
-            created_at: tag.created_at,
-            created_by_user_id: nil }
-        })
-      end
-    end
-  end
-
-  def down
-    drop_table :nico_tag_versions
-    drop_table :tag_versions
-  end
-end

backend/db/migrate/20260426120600_create_wiki_versions.rb

@@ -1,91 +0,0 @@
-class CreateWikiVersions < ActiveRecord::Migration[8.0]
-  class WikiPage < ActiveRecord::Base
-    self.table_name = 'wiki_pages'
-  end
-
-  class WikiRevision < ActiveRecord::Base
-    self.table_name = 'wiki_revisions'
-  end
-
-  class WikiRevisionLine < ActiveRecord::Base
-    self.table_name = 'wiki_revision_lines'
-  end
-
-  class WikiLine < ActiveRecord::Base
-    self.table_name = 'wiki_lines'
-  end
-
-  class WikiVersion < ActiveRecord::Base
-    self.table_name = 'wiki_versions'
-  end
-
-  class TagName < ActiveRecord::Base
-    self.table_name = 'tag_names'
-  end
-
-  def up
-    add_column :wiki_pages, :body, :text, after: :tag_name_id
-
-    create_table :wiki_versions do |t|
-      t.references :wiki_page, null: false, foreign_key: true
-      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.references :created_by_user, foreign_key: { to_table: :users }
-
-      t.index [:wiki_page_id, :version_no], unique: true
-      t.check_constraint 'version_no > 0',
-                         name: 'wiki_versions_version_no_positive'
-      t.check_constraint "event_type IN ('create', 'update', 'discard', 'restore')",
-                         name: 'wiki_versions_event_type_valid'
-    end
-
-    WikiPage.reset_column_information
-    WikiVersion.reset_column_information
-
-    say_with_time 'Backfilling wiki_versions' do
-      WikiPage.find_each do |page|
-        base_revision_id = nil
-        version_no = 1
-        title = TagName.find(page.tag_name_id).name
-        body = nil
-        loop do
-          rev = WikiRevision.where(wiki_page_id: page.id).find_by(base_revision_id:)
-          break unless rev
-
-          body = WikiRevisionLine.where(wiki_revision_id: rev.id).order(:position).map { |wrl|
-            WikiLine.find(wrl.wiki_line_id).body
-          }.join("\n")
-
-          WikiVersion.create!(
-              wiki_page_id: page.id,
-              version_no:,
-              event_type: version_no == 1 ? 'create' : 'update',
-              title:,
-              body:,
-              reason: rev.message,
-              created_at: rev.created_at,
-              created_by_user_id: rev.created_user_id)
-
-          version_no += 1
-          base_revision_id = rev.id
-        end
-        if body
-          page.update!(body:)
-        else
-          page.destroy!
-        end
-      end
-    end
-
-    change_column_null :wiki_pages, :body, false
-  end
-
-  def down
-    drop_table :wiki_versions
-    remove_column :wiki_pages, :body
-  end
-end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
+ActiveRecord::Schema[8.0].define(version: 2026_03_03_122700) 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
@@ -56,45 +56,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     t.index ["ip_address"], name: "index_ip_addresses_on_ip_address", unique: true
   end
 
-  create_table "material_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "material_id", null: false
-    t.integer "version_no", null: false
-    t.string "url"
-    t.bigint "parent_id"
-    t.bigint "tag_id"
-    t.bigint "created_by_user_id"
-    t.bigint "updated_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
-    t.index ["created_by_user_id"], name: "index_material_versions_on_created_by_user_id"
-    t.index ["discarded_at"], name: "index_material_versions_on_discarded_at"
-    t.index ["material_id", "version_no"], name: "index_material_versions_on_material_id_and_version_no", unique: true
-    t.index ["material_id"], name: "index_material_versions_on_material_id"
-    t.index ["parent_id"], name: "index_material_versions_on_parent_id"
-    t.index ["tag_id"], name: "index_material_versions_on_tag_id"
-    t.index ["updated_by_user_id"], name: "index_material_versions_on_updated_by_user_id"
-    t.index ["url"], name: "index_material_versions_on_url"
-  end
-
-  create_table "materials", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "url"
-    t.bigint "parent_id"
-    t.bigint "tag_id"
-    t.bigint "created_by_user_id"
-    t.bigint "updated_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
-    t.virtual "active_url", type: :string, as: "if((`discarded_at` is null),`url`,NULL)"
-    t.index ["active_url"], name: "index_materials_on_active_url", unique: true
-    t.index ["created_by_user_id"], name: "index_materials_on_created_by_user_id"
-    t.index ["discarded_at"], name: "index_materials_on_discarded_at"
-    t.index ["parent_id"], name: "index_materials_on_parent_id"
-    t.index ["tag_id"], name: "index_materials_on_tag_id"
-    t.index ["updated_by_user_id"], name: "index_materials_on_updated_by_user_id"
-  end
-
   create_table "nico_tag_relations", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "nico_tag_id", null: false
     t.bigint "tag_id", null: false
@@ -104,21 +65,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     t.index ["tag_id"], name: "index_nico_tag_relations_on_tag_id"
   end
 
-  create_table "nico_tag_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "name", null: false
-    t.text "linked_tags", null: false
-    t.datetime "created_at", null: false
-    t.bigint "created_by_user_id"
-    t.index ["created_at"], name: "index_nico_tag_versions_on_created_at"
-    t.index ["created_by_user_id", "created_at"], name: "index_nico_tag_versions_on_created_by_user_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "created_at"], name: "index_nico_tag_versions_on_tag_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "version_no"], name: "index_nico_tag_versions_on_tag_id_and_version_no", unique: true
-    t.check_constraint "`version_no` > 0", name: "nico_tag_versions_version_no_positive"
-  end
-
   create_table "post_similarities", primary_key: ["post_id", "target_post_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.bigint "target_post_id", null: false
@@ -147,27 +93,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     t.index ["tag_id"], name: "index_post_tags_on_tag_id"
   end
 
-  create_table "post_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "post_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "title"
-    t.string "url", limit: 768, null: false
-    t.string "thumbnail_base", limit: 2000
-    t.text "tags", null: false
-    t.bigint "parent_id"
-    t.datetime "original_created_from"
-    t.datetime "original_created_before"
-    t.datetime "created_at", null: false
-    t.bigint "created_by_user_id"
-    t.index ["created_by_user_id"], name: "index_post_versions_on_created_by_user_id"
-    t.index ["parent_id"], name: "index_post_versions_on_parent_id"
-    t.index ["post_id", "version_no"], name: "index_post_versions_on_post_id_and_version_no", unique: true
-    t.index ["post_id"], name: "index_post_versions_on_post_id"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "post_versions_event_type_valid"
-    t.check_constraint "`version_no` > 0", name: "post_versions_version_no_positive"
-  end
-
   create_table "posts", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "title"
     t.string "url", limit: 768, null: false
@@ -202,24 +127,12 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     t.index ["tag_id"], name: "index_tag_implications_on_tag_id"
   end
 
-  create_table "tag_name_sanitisation_rules", primary_key: "priority", id: :integer, charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "source_pattern", null: false
-    t.string "replacement", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
-    t.index ["discarded_at"], name: "index_tag_name_sanitisation_rules_on_discarded_at"
-    t.index ["source_pattern"], name: "index_tag_name_sanitisation_rules_on_source_pattern", unique: true
-  end
-
   create_table "tag_names", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.bigint "canonical_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
     t.index ["canonical_id"], name: "index_tag_names_on_canonical_id"
-    t.index ["discarded_at"], name: "index_tag_names_on_discarded_at"
     t.index ["name"], name: "index_tag_names_on_name", unique: true
   end
 
@@ -231,81 +144,15 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     t.index ["target_tag_id"], name: "index_tag_similarities_on_target_tag_id"
   end
 
-  create_table "tag_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "tag_id", null: false
-    t.integer "version_no", null: false
-    t.string "event_type", null: false
-    t.string "name", null: false
-    t.string "category", null: false
-    t.text "aliases", null: false
-    t.text "parent_tag_ids", null: false
-    t.datetime "created_at", null: false
-    t.bigint "created_by_user_id"
-    t.index ["created_at"], name: "index_tag_versions_on_created_at"
-    t.index ["created_by_user_id", "created_at"], name: "index_tag_versions_on_created_by_user_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "created_at"], name: "index_tag_versions_on_tag_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "version_no"], name: "index_tag_versions_on_tag_id_and_version_no", unique: true
-    t.check_constraint "`version_no` > 0", name: "tag_versions_version_no_positive"
-  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 "created_at", null: false
     t.datetime "updated_at", null: false
     t.integer "post_count", default: 0, null: false
-    t.datetime "discarded_at"
-    t.index ["discarded_at"], name: "index_tags_on_discarded_at"
     t.index ["tag_name_id"], name: "index_tags_on_tag_name_id", unique: true
   end
 
-  create_table "theatre_comments", primary_key: ["theatre_id", "no"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.integer "no", null: false
-    t.bigint "user_id"
-    t.text "content", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
-    t.index ["discarded_at"], name: "index_theatre_comments_on_discarded_at"
-    t.index ["theatre_id"], name: "index_theatre_comments_on_theatre_id"
-    t.index ["user_id"], name: "index_theatre_comments_on_user_id"
-  end
-
-  create_table "theatre_watching_users", primary_key: ["theatre_id", "user_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.bigint "user_id", null: false
-    t.datetime "expires_at", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["expires_at"], name: "index_theatre_watching_users_on_expires_at"
-    t.index ["theatre_id", "expires_at"], name: "index_theatre_watching_users_on_theatre_id_and_expires_at"
-    t.index ["theatre_id"], name: "index_theatre_watching_users_on_theatre_id"
-    t.index ["user_id"], name: "index_theatre_watching_users_on_user_id"
-  end
-
-  create_table "theatres", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "name"
-    t.datetime "opens_at", null: false
-    t.datetime "closes_at"
-    t.integer "kind", null: false
-    t.bigint "current_post_id"
-    t.datetime "current_post_started_at"
-    t.integer "next_comment_no", default: 1, null: false
-    t.bigint "host_user_id"
-    t.bigint "created_by_user_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
-    t.index ["closes_at"], name: "index_theatres_on_closes_at"
-    t.index ["created_by_user_id"], name: "index_theatres_on_created_by_user_id"
-    t.index ["current_post_id"], name: "index_theatres_on_current_post_id"
-    t.index ["discarded_at"], name: "index_theatres_on_discarded_at"
-    t.index ["host_user_id"], name: "index_theatres_on_host_user_id"
-    t.index ["kind"], name: "index_theatres_on_kind"
-    t.index ["opens_at"], name: "index_theatres_on_opens_at"
-  end
-
   create_table "user_ips", primary_key: ["user_id", "ip_address_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "user_id", null: false
     t.bigint "ip_address_id", null: false
@@ -331,19 +178,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     t.datetime "updated_at", null: false
   end
 
-  create_table "wiki_assets", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "wiki_page_id", null: false
-    t.integer "no", null: false
-    t.string "alt_text"
-    t.binary "sha256", limit: 32, null: false
-    t.bigint "created_by_user_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_wiki_assets_on_created_by_user_id"
-    t.index ["wiki_page_id", "no"], name: "index_wiki_assets_on_wiki_page_id_and_no", unique: true
-    t.index ["wiki_page_id", "sha256"], name: "index_wiki_assets_on_wiki_page_id_and_sha256", unique: true
-  end
-
   create_table "wiki_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "sha256", limit: 64, null: false
     t.text "body", null: false
@@ -354,15 +188,11 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
 
   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 "next_asset_no", default: 1, 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"
   end
@@ -397,46 +227,16 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
     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 "material_versions", "materials"
-  add_foreign_key "material_versions", "materials", column: "parent_id"
-  add_foreign_key "material_versions", "tags"
-  add_foreign_key "material_versions", "users", column: "created_by_user_id"
-  add_foreign_key "material_versions", "users", column: "updated_by_user_id"
-  add_foreign_key "materials", "materials", column: "parent_id"
-  add_foreign_key "materials", "tags"
-  add_foreign_key "materials", "users", column: "created_by_user_id"
-  add_foreign_key "materials", "users", column: "updated_by_user_id"
   add_foreign_key "nico_tag_relations", "tags"
   add_foreign_key "nico_tag_relations", "tags", column: "nico_tag_id"
-  add_foreign_key "nico_tag_versions", "tags"
-  add_foreign_key "nico_tag_versions", "users", column: "created_by_user_id"
   add_foreign_key "post_similarities", "posts"
   add_foreign_key "post_similarities", "posts", column: "target_post_id"
   add_foreign_key "post_tags", "posts"
   add_foreign_key "post_tags", "tags"
   add_foreign_key "post_tags", "users", column: "created_user_id"
   add_foreign_key "post_tags", "users", column: "deleted_user_id"
-  add_foreign_key "post_versions", "posts"
-  add_foreign_key "post_versions", "posts", column: "parent_id"
-  add_foreign_key "post_versions", "users", column: "created_by_user_id"
   add_foreign_key "posts", "posts", column: "parent_id"
   add_foreign_key "posts", "users", column: "uploaded_user_id"
   add_foreign_key "settings", "users"
@@ -445,22 +245,11 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
   add_foreign_key "tag_names", "tag_names", column: "canonical_id"
   add_foreign_key "tag_similarities", "tags"
   add_foreign_key "tag_similarities", "tags", column: "target_tag_id"
-  add_foreign_key "tag_versions", "tags"
-  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_watching_users", "theatres"
-  add_foreign_key "theatre_watching_users", "users"
-  add_foreign_key "theatres", "posts", column: "current_post_id"
-  add_foreign_key "theatres", "users", column: "created_by_user_id"
-  add_foreign_key "theatres", "users", column: "host_user_id"
   add_foreign_key "user_ips", "ip_addresses"
   add_foreign_key "user_ips", "users"
   add_foreign_key "user_post_views", "posts"
   add_foreign_key "user_post_views", "users"
-  add_foreign_key "wiki_assets", "users", column: "created_by_user_id"
-  add_foreign_key "wiki_assets", "wiki_pages"
   add_foreign_key "wiki_pages", "tag_names"
   add_foreign_key "wiki_pages", "users", column: "created_user_id"
   add_foreign_key "wiki_pages", "users", column: "updated_user_id"
@@ -470,6 +259,4 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_26_120600) do
   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/export_nico.rake

@@ -1,23 +0,0 @@
-namespace :nico do
-  desc 'ニコニコ DB 逆連携'
-  task export: :environment do
-    require 'open3'
-
-    mysql_user = ENV.fetch('MYSQL_USER')
-    mysql_pass = ENV.fetch('MYSQL_PASS')
-    nizika_nico_path = ENV.fetch('NIZIKA_NICO_PATH')
-
-    videos = Post.where('url LIKE ?', '%nicovideo.jp/watch/%').pluck(:url).filter_map {
-      _1[%r{nicovideo\.jp/watch/([^/?#]+)}, 1]
-    }.uniq
-
-    next if videos.empty?
-
-    _, stderr, status = Open3.capture3(
-        { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
-        'python3', '-m', 'tracked_videos.put_bulk_upsert', *videos,
-        chdir: nizika_nico_path)
-
-    raise stderr unless status.success?
-  end
-end

backend/lib/tasks/sync_nico.rake

@@ -61,9 +61,6 @@ namespace :nico do
       original_created_from = original_created_at&.change(sec: 0)
       original_created_before = original_created_from&.+(1.minute)
 
-      post_created = false
-      post_changed = false
-
       if post
         attrs = { title:, original_created_from:, original_created_before: }
 
@@ -79,13 +76,11 @@ namespace :nico do
         end
 
         post.assign_attributes(attrs)
-        post_changed = post.changed?
+        if post.changed?
-        if post_changed
           post.save!
           post.resized_thumbnail! if post.thumbnail.attached?
         end
       else
-        post_created = true
         url = "https://www.nicovideo.jp/watch/#{ code }"
         thumbnail_base = fetch_thumbnail.(url) rescue nil
         post = Post.new(title:, url:, thumbnail_base:, uploaded_user: nil,
@@ -113,12 +108,8 @@ namespace :nico do
       desired_non_nico_tag_ids = []
 
       datum['tags'].each do |raw|
-        name = TagNameSanitisationRule.sanitise("nico:#{ raw }")
+        name = "nico:#{ raw }"
         tag = Tag.find_or_create_by_tag_name!(name, category: :nico)
-
-        event_type = tag.nico_tag_versions.exists? ? :update : :create
-        NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user: nil)
-
         desired_nico_tag_based_ids << tag.id
 
         # 新たに記載される外部タグと連携される内部タグを記載
@@ -149,13 +140,6 @@ namespace :nico do
       desired_all_tag_ids.uniq!
 
       sync_post_tags!(post, desired_all_tag_ids, current_tag_ids: kept_tag_ids)
-
-      if post_created
-        PostVersionRecorder.record!(post:, event_type: :create, created_by_user: nil)
-      elsif post_changed || kept_tag_ids != desired_all_tag_ids.to_set
-        PostVersionRecorder.ensure_snapshot!(post, created_by_user: nil)
-        PostVersionRecorder.record!(post:, event_type: :update, created_by_user: nil)
-      end
     end
   end
 end

backend/spec/factories/tags.rb

@@ -1,22 +1,12 @@
 FactoryBot.define do
   factory :tag do
-    transient do
-      name { nil }
-    end
-
     category { :general }
     post_count { 0 }
     association :tag_name
 
-    after(:build) do |tag, evaluator|
-      tag.name = evaluator.name if evaluator.name.present?
-    end
-
     trait :nico do
       category { :nico }
-      transient do
+      tag_name { association(:tag_name, name: "nico:#{ SecureRandom.hex(4) }") }
-        name { "nico:#{ SecureRandom.hex(4) }" }
-      end
     end
   end
 end

backend/spec/factories/theatre_comments.rb

@@ -1,8 +0,0 @@
-FactoryBot.define do
-  factory :theatre_comment do
-    association :theatre
-    association :user
-    sequence (:no) { |n| n }
-    content { 'test comment' }
-  end
-end

backend/spec/factories/theatres.rb

@@ -1,11 +0,0 @@
-FactoryBot.define do
-  factory :theatre do
-    name { 'Test Theatre' }
-    kind { 1 }
-    opens_at { Time.current }
-    closes_at { 1.day.from_now }
-    next_comment_no { 1 }
-
-    association :created_by_user, factory: :user
-  end
-end

backend/spec/factories/wiki_pages.rb

@@ -3,7 +3,5 @@ FactoryBot.define do
     title { "TestPage" }
     association :created_user, factory: :user
     association :updated_user, factory: :user
-
-    body { ' ' }
   end
 end

backend/spec/models/post_version_spec.rb

@@ -1,41 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe PostVersion, type: :model do
-  let!(:tag_name) { TagName.create!(name: 'post_version_spec_tag') }
-  let!(:tag) { Tag.create!(tag_name: tag_name, category: :general) }
-
-  let!(:post_record) do
-    Post.create!(title: 'spec post', url: 'https://example.com/post-version-spec').tap do |post|
-      PostTag.create!(post: post, tag: tag)
-    end
-  end
-
-  let!(:post_version) do
-    PostVersion.create!(
-      post: post_record,
-      version_no: 1,
-      event_type: 'create',
-      title: post_record.title,
-      url: post_record.url,
-      thumbnail_base: post_record.thumbnail_base,
-      tags: post_record.snapshot_tag_names.join(' '),
-      parent: post_record.parent,
-      original_created_from: post_record.original_created_from,
-      original_created_before: post_record.original_created_before,
-      created_at: Time.current,
-      created_by_user: nil
-    )
-  end
-
-  it 'is read only after create' do
-    expect do
-      post_version.update!(title: 'changed')
-    end.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'cannot be destroyed' do
-    expect do
-      post_version.destroy!
-    end.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-end

backend/spec/models/tag_name_sanitisation_rule_spec.rb

@@ -1,101 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe TagNameSanitisationRule, type: :model do
-  describe '.sanitise' do
-    before do
-      described_class.create!(priority: 10, source_pattern: '_', replacement: '')
-      described_class.create!(priority: 20, source_pattern: 'ABC', replacement: 'abc')
-    end
-
-    it 'applies sanitisation rules sequentially in priority order' do
-      expect(described_class.sanitise('A_B_C')).to eq('abc')
-    end
-
-    it 'does not fail when a rule does not match' do
-      expect { described_class.sanitise('xyz') }.not_to raise_error
-      expect(described_class.sanitise('xyz')).to eq('xyz')
-    end
-  end
-
-  describe 'validations' do
-    it 'is invalid when source_pattern is not a valid regexp' do
-      rule = described_class.new(priority: 10, source_pattern: '[', replacement: '')
-      expect(rule).to be_invalid
-      expect(rule.errors[:source_pattern]).to be_present
-    end
-  end
-
-  describe '.apply!' do
-    before do
-      described_class.create!(priority: 10, source_pattern: '_', replacement: '')
-    end
-
-    context 'when no conflicting tag_name exists' do
-      let!(:tag_name) do
-        TagName.create!(name: 'tmp').tap do |tn|
-          tn.update_columns(name: 'foo_bar', updated_at: Time.current)
-        end
-      end
-
-      it 'renames the tag_name' do
-        described_class.apply!
-        expect(tag_name.reload.name).to eq('foobar')
-      end
-    end
-
-    context 'when a conflicting canonical tag_name exists' do
-      let!(:existing) { TagName.create!(name: 'foobar') }
-      let!(:source) do
-        TagName.create!(name: 'tmp').tap do |tn|
-          tn.update_columns(name: 'foo_bar', updated_at: Time.current)
-        end
-      end
-
-      it 'deletes the source tag_name' do
-        described_class.apply!
-        expect(TagName.exists?(source.id)).to be(false)
-        expect(existing.reload.name).to eq('foobar')
-      end
-    end
-
-    context 'when the source tag_name has a tag and the existing one has no tag' do
-      let!(:existing) { TagName.create!(name: 'foobar') }
-      let!(:source_tag) { create(:tag, name: 'tmp', category: :general) }
-      let!(:source_tag_name_id) { source_tag.tag_name_id }
-
-      before do
-        source_tag.tag_name.update_columns(name: 'foo_bar', updated_at: Time.current)
-      end
-
-      it 'moves the tag to the existing tag_name' do
-        described_class.apply!
-        expected_tag_name_id = existing.canonical_id || existing.id
-        expect(source_tag.reload.tag_name_id).to eq(expected_tag_name_id)
-        expect(TagName.exists?(source_tag_name_id)).to be(false)
-      end
-    end
-
-    context 'when both source and existing tag_names have tags' do
-      let!(:existing_tn) { TagName.create!(name: 'foobar') }
-      let!(:existing_tag) { Tag.create!(tag_name: existing_tn, category: :general) }
-
-      let!(:source_tn) { TagName.create!(name: 'tmp') }
-      let!(:source_tag) { Tag.create!(tag_name: source_tn, category: :general) }
-      let!(:source_tag_name_id) { source_tn.id }
-
-      before do
-        source_tn.update_columns(name: 'foo_bar', updated_at: Time.current)
-      end
-
-      it 'merges the source tag into the existing tag and deletes the source tag_name' do
-        expect(TagName.find_by(name: 'foobar')&.tag&.id).to eq(existing_tag.id)
-        expect(TagName.find_by(name: 'foo_bar')&.tag&.id).to eq(source_tag.id)
-
-        described_class.apply!
-
-        expect(Tag.exists?(source_tag.id)).to be(false)
-        expect(TagName.exists?(source_tag.tag_name_id)).to be(false)
-      end
-    end
-  end
-end

backend/spec/models/tag_spec.rb

@@ -2,31 +2,20 @@ require 'rails_helper'
 
 RSpec.describe Tag, type: :model do
   describe '.merge_tags!' do
-    let!(:target_tag) { create(:tag, category: :general) }
+    let!(:target_tag) { create(:tag) }
-    let!(:source_tag) { create(:tag, category: :general) }
+    let!(:source_tag) { create(:tag) }
-    let!(:source_tag_name) { source_tag.tag_name }
 
-    let!(:post_record) do
+    let!(:post_record) { Post.create!(url: 'https://example.com/posts/1', title: 'test post') }
-      Post.create!(url: 'https://example.com/posts/1', title: 'test post')
-    end
 
     context 'when merging a simple source tag' do
       let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
 
-      it 'discards the source post_tag, creates an active target post_tag, discards the source tag, and aliases the source tag_name' do
+      it 'moves the post_tag, deletes the source tag, and aliases the source tag_name' do
         described_class.merge_tags!(target_tag, [source_tag])
 
-        source_pt = PostTag.with_discarded.find(source_post_tag.id)
+        expect(source_post_tag.reload.tag_id).to eq(target_tag.id)
-        active_target = PostTag.kept.find_by(post_id: post_record.id, tag_id: target_tag.id)
+        expect(Tag.exists?(source_tag.id)).to be(false)
-
+        expect(source_tag.tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
-        expect(source_pt.discarded_at).to be_present
-        expect(source_pt.tag_id).to eq(source_tag.id)
-        expect(active_target).to be_present
-
-        expect(Tag.with_discarded.find(source_tag.id)).to be_discarded
-        expect(TagName.with_discarded.find(source_tag_name.id)).not_to be_discarded
-        expect(source_tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
-        expect(target_tag.reload.post_count).to eq(1)
       end
     end
 
@@ -34,86 +23,38 @@ RSpec.describe Tag, type: :model do
       let!(:target_post_tag) { PostTag.create!(post: post_record, tag: target_tag) }
       let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
 
-      it 'discards the source post_tag, keeps one active target post_tag, discards the source tag, and aliases the source tag_name' do
+      it 'discards the duplicate source post_tag and keeps one active target post_tag' do
         described_class.merge_tags!(target_tag, [source_tag])
 
-        source_pt = PostTag.with_discarded.find(source_post_tag.id)
         active = PostTag.kept.where(post_id: post_record.id, tag_id: target_tag.id)
+        discarded_source = PostTag.with_discarded.find(source_post_tag.id)
 
-        expect(source_pt.discarded_at).to be_present
-        expect(source_pt.tag_id).to eq(source_tag.id)
         expect(active.count).to eq(1)
-        expect(active.first.id).to eq(target_post_tag.id)
+        expect(discarded_source.discarded_at).to be_present
-
+        expect(Tag.exists?(source_tag.id)).to be(false)
-        expect(Tag.with_discarded.find(source_tag.id)).to be_discarded
+        expect(source_tag.tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
-        expect(TagName.with_discarded.find(source_tag_name.id)).not_to be_discarded
-        expect(source_tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
-        expect(target_tag.reload.post_count).to eq(1)
       end
     end
 
     context 'when source_tags includes the target itself' do
       let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
 
-      it 'ignores the target in source_tags while still merging the source tag' do
+      it 'ignores the target tag in source_tags' do
         described_class.merge_tags!(target_tag, [source_tag, target_tag])
 
-        source_pt = PostTag.with_discarded.find(source_post_tag.id)
+        expect(Tag.exists?(target_tag.id)).to be(true)
-        active_target = PostTag.kept.find_by(post_id: post_record.id, tag_id: target_tag.id)
+        expect(Tag.exists?(source_tag.id)).to be(false)
-
+        expect(source_post_tag.reload.tag_id).to eq(target_tag.id)
-        expect(Tag.find(target_tag.id)).to be_present
-        expect(Tag.with_discarded.find(source_tag.id)).to be_discarded
-        expect(source_pt.discarded_at).to be_present
-        expect(source_pt.tag_id).to eq(source_tag.id)
-        expect(active_target).to be_present
-        expect(source_tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
-        expect(target_tag.reload.post_count).to eq(1)
       end
     end
 
-    context 'when the source tag_name is invalid under sanitisation rules' do
+    context 'when aliasing the source tag_name is invalid' do
-      let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
-      let!(:sanitisation_rule) do
-        TagNameSanitisationRule.create!(
-          priority: 99_999,
-          source_pattern: 'INVALIDTOKEN',
-          replacement: ''
-        )
-      end
-
-      before do
-        source_tag_name.update_columns(
-          name: "#{ source_tag_name.name }INVALIDTOKEN",
-          updated_at: Time.current
-        )
-      end
-
-      it 'still merges, but discards the source tag_name instead of aliasing it' do
-        described_class.merge_tags!(target_tag, [source_tag])
-
-        source_pt = PostTag.with_discarded.find(source_post_tag.id)
-        active_target = PostTag.kept.find_by(post_id: post_record.id, tag_id: target_tag.id)
-        discarded_source_tag_name = TagName.with_discarded.find(source_tag_name.id)
-
-        expect(source_pt.discarded_at).to be_present
-        expect(source_pt.tag_id).to eq(source_tag.id)
-        expect(active_target).to be_present
-
-        expect(Tag.with_discarded.find(source_tag.id)).to be_discarded
-        expect(target_tag.reload.post_count).to eq(1)
-      end
-    end
-
-    context 'when the source tag_name has a wiki_page' do
       let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
       let!(:wiki_page) do
-        admin = create_admin_user!
+        WikiPage.create!(
-
+            tag_name: source_tag.tag_name,
-        Wiki::Commit.create_content!(
+            created_user: create_admin_user!,
-            tag_name: source_tag_name,
+            updated_user: create_admin_user!)
-            body: 'source wiki body',
-            created_by_user: admin,
-            message: 'init')
       end
 
       it 'rolls back the transaction' do
@@ -121,95 +62,9 @@ RSpec.describe Tag, type: :model do
           described_class.merge_tags!(target_tag, [source_tag])
         }.to raise_error(ActiveRecord::RecordInvalid)
 
-        expect(Tag.with_discarded.find(source_tag.id)).not_to be_discarded
+        expect(Tag.exists?(source_tag.id)).to be(true)
-        expect(TagName.with_discarded.find(source_tag_name.id)).not_to be_discarded
+        expect(source_post_tag.reload.tag_id).to eq(source_tag.id)
-        expect(PostTag.kept.find(source_post_tag.id).tag_id).to eq(source_tag.id)
+        expect(source_tag.tag_name.reload.canonical_id).to be_nil
-        expect(PostTag.kept.find_by(post_id: post_record.id, tag_id: target_tag.id)).to be_nil
-        expect(source_tag_name.reload.canonical_id).to be_nil
-        expect(target_tag.reload.post_count).to eq(0)
-      end
-    end
-
-    context 'when merging a nico source tag' do
-      let!(:target_tag) { create(:tag, category: :nico, name: 'nico:foo') }
-      let!(:source_tag) { create(:tag, category: :nico, name: 'nico:bar') }
-      let!(:source_tag_name_id) { source_tag.tag_name_id }
-
-      it 'discards the source tag_name instead of aliasing it' do
-        described_class.merge_tags!(target_tag, [source_tag])
-
-        discarded_source_tag = Tag.with_discarded.find(source_tag.id)
-        discarded_source_tag_name = TagName.with_discarded.find(source_tag_name_id)
-
-        expect(discarded_source_tag).to be_discarded
-        expect(discarded_source_tag_name).to be_discarded
-        expect(discarded_source_tag_name.canonical_id).to be_nil
-        expect(target_tag.reload.post_count).to eq(0)
-      end
-    end
-
-    def snapshot_tags(post)
-      post.snapshot_tag_names.join(' ')
-    end
-
-    def create_post_version_for!(post, version_no: 1, event_type: 'create', created_by_user: nil)
-      PostVersion.create!(
-        post: post,
-        version_no: version_no,
-        event_type: event_type,
-        title: post.title,
-        url: post.url,
-        thumbnail_base: post.thumbnail_base,
-        tags: snapshot_tags(post),
-        parent: post.parent,
-        original_created_from: post.original_created_from,
-        original_created_before: post.original_created_before,
-        created_at: Time.current,
-        created_by_user: created_by_user
-      )
-    end
-
-    context 'when post versions are enabled' do
-      let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
-      let!(:unaffected_post) do
-        Post.create!(url: 'https://example.com/posts/2', title: 'unaffected post')
-      end
-
-      before do
-        create_post_version_for!(post_record)
-        create_post_version_for!(unaffected_post)
-      end
-
-      it 'creates an update post_version only for affected posts' do
-        expect {
-          described_class.merge_tags!(target_tag, [source_tag])
-        }.to change(PostVersion, :count).by(1)
-
-        affected_versions = post_record.reload.post_versions.order(:version_no)
-        expect(affected_versions.pluck(:version_no)).to eq([1, 2])
-
-        latest = affected_versions.last
-        expect(latest.event_type).to eq('update')
-        expect(latest.created_by_user).to be_nil
-        expect(latest.tags).to eq(snapshot_tags(post_record.reload))
-
-        expect(unaffected_post.reload.post_versions.count).to eq(1)
-      end
-    end
-
-    context 'when the source tag has no active post_tags' do
-      let!(:another_post) do
-        Post.create!(url: 'https://example.com/posts/3', title: 'another post')
-      end
-
-      before do
-        create_post_version_for!(another_post)
-      end
-
-      it 'does not create any post_version' do
-        expect {
-          described_class.merge_tags!(target_tag, [source_tag])
-        }.not_to change(PostVersion, :count)
       end
     end
   end

backend/spec/models/version_record_spec.rb

@@ -1,74 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe VersionRecord, type: :model do
-  let!(:tag) { create(:tag, name: 'version_record_tag') }
-  let!(:nico_tag) { create(:tag, :nico, name: 'nico:version_record_tag') }
-
-  it 'makes TagVersion read only after create' do
-    version = TagVersion.create!(
-      tag: tag,
-      version_no: 1,
-      event_type: 'create',
-      name: tag.name,
-      category: tag.category,
-      aliases: '',
-      parent_tag_ids: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.update!(name: 'changed')
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'prevents TagVersion destroy' do
-    version = TagVersion.create!(
-      tag: tag,
-      version_no: 1,
-      event_type: 'create',
-      name: tag.name,
-      category: tag.category,
-      aliases: '',
-      parent_tag_ids: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.destroy!
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'makes NicoTagVersion read only after create' do
-    version = NicoTagVersion.create!(
-      tag: nico_tag,
-      version_no: 1,
-      event_type: 'create',
-      name: nico_tag.name,
-      linked_tags: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.update!(name: 'nico:changed')
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-
-  it 'prevents NicoTagVersion destroy' do
-    version = NicoTagVersion.create!(
-      tag: nico_tag,
-      version_no: 1,
-      event_type: 'create',
-      name: nico_tag.name,
-      linked_tags: '',
-      created_at: Time.current,
-      created_by_user: nil
-    )
-
-    expect {
-      version.destroy!
-    }.to raise_error(ActiveRecord::ReadOnlyRecord)
-  end
-end

backend/spec/requests/materials_spec.rb

@@ -1,378 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Materials API', type: :request do
-  let!(:member_user) { create(:user, :member) }
-  let!(:guest_user)  { create(:user) }
-
-  def dummy_upload(filename: 'dummy.png', type: 'image/png', body: 'dummy')
-    Rack::Test::UploadedFile.new(StringIO.new(body), type, original_filename: filename)
-  end
-
-  def response_materials
-    json.fetch('materials')
-  end
-
-  def build_material(tag:, user:, parent: nil, file: dummy_upload, url: nil)
-    Material.new(tag:, parent:, url:, created_by_user: user, updated_by_user: user).tap do |material|
-      material.file.attach(file) if file
-      material.save!
-    end
-  end
-
-  describe 'GET /materials' do
-    let!(:tag_a) { Tag.create!(tag_name: TagName.create!(name: 'material_index_a'), category: :material) }
-    let!(:tag_b) { Tag.create!(tag_name: TagName.create!(name: 'material_index_b'), category: :material) }
-
-    let!(:material_a) do
-      build_material(tag: tag_a, user: member_user, file: dummy_upload(filename: 'a.png'))
-    end
-
-    let!(:material_b) do
-      build_material(tag: tag_b, user: member_user, parent: material_a, file: dummy_upload(filename: 'b.png'))
-    end
-
-    before do
-      old_time = Time.zone.local(2026, 3, 29, 1, 0, 0)
-      new_time = Time.zone.local(2026, 3, 29, 2, 0, 0)
-
-      material_a.update_columns(created_at: old_time, updated_at: old_time)
-      material_b.update_columns(created_at: new_time, updated_at: new_time)
-    end
-
-    it 'returns materials with count and metadata' do
-      get '/materials'
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('materials', 'count')
-      expect(response_materials).to be_an(Array)
-      expect(json['count']).to eq(2)
-
-      row = response_materials.find { |m| m['id'] == material_b.id }
-      expect(row).to be_present
-      expect(row['tag']).to include(
-        'id' => tag_b.id,
-        'name' => 'material_index_b',
-        'category' => 'material'
-      )
-      expect(row['created_by_user']).to include(
-        'id' => member_user.id,
-        'name' => member_user.name
-      )
-      expect(row['content_type']).to eq('image/png')
-    end
-
-    it 'filters materials by tag_id' do
-      get '/materials', params: { tag_id: material_a.tag_id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(1)
-      expect(response_materials.map { |m| m['id'] }).to eq([material_a.id])
-    end
-
-    it 'filters materials by parent_id' do
-      get '/materials', params: { parent_id: material_a.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(1)
-      expect(response_materials.map { |m| m['id'] }).to eq([material_b.id])
-    end
-
-    it 'paginates and keeps total count' do
-      get '/materials', params: { page: 2, limit: 1 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(2)
-      expect(response_materials.size).to eq(1)
-      expect(response_materials.first['id']).to eq(material_a.id)
-    end
-
-    it 'normalises invalid page and limit' do
-      get '/materials', params: { page: 0, limit: 0 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(2)
-      expect(response_materials.size).to eq(1)
-      expect(response_materials.first['id']).to eq(material_b.id)
-    end
-  end
-
-  describe 'GET /materials/:id' do
-    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_show'), category: :material) }
-    let!(:material) do
-      build_material(tag:, user: member_user, file: dummy_upload(filename: 'show.png'))
-    end
-
-    it 'returns a material with file, tag, and content_type' do
-      get "/materials/#{ material.id }"
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include(
-        'id' => material.id,
-        'content_type' => 'image/png'
-      )
-      expect(json['file']).to be_present
-      expect(json['tag']).to include(
-        'id' => tag.id,
-        'name' => 'material_show',
-        'category' => 'material'
-      )
-    end
-
-    it 'returns 404 when material does not exist' do
-      get '/materials/999999999'
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  describe 'POST /materials' do
-    context 'when not logged in' do
-      before { sign_out }
-
-      it 'returns 401' do
-        post '/materials', params: {
-          tag: 'material_create_unauthorized',
-          file: dummy_upload
-        }
-
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'when logged in' do
-      before { sign_in_as(guest_user) }
-
-      it 'returns 400 when tag is blank' do
-        post '/materials', params: { tag: '   ', file: dummy_upload }
-
-        expect(response).to have_http_status(:bad_request)
-      end
-
-      it 'returns 400 when both file and url are blank' do
-        post '/materials', params: { tag: 'material_create_blank' }
-
-        expect(response).to have_http_status(:bad_request)
-      end
-
-      it 'creates a material with an attached file' do
-        expect do
-          post '/materials', params: {
-            tag: 'material_create_new',
-            file: dummy_upload(filename: 'created.png')
-          }
-        end.to change(Material, :count).by(1)
-          .and change(Tag, :count).by(1)
-          .and change(TagName, :count).by(1)
-
-        expect(response).to have_http_status(:created)
-
-        material = Material.order(:id).last
-        expect(material.tag.name).to eq('material_create_new')
-        expect(material.tag.category).to eq('material')
-        expect(material.created_by_user).to eq(guest_user)
-        expect(material.updated_by_user).to eq(guest_user)
-        expect(material.file.attached?).to be(true)
-
-        expect(json['id']).to eq(material.id)
-        expect(json.dig('tag', 'name')).to eq('material_create_new')
-        expect(json['content_type']).to eq('image/png')
-      end
-
-      it 'returns 422 when the existing tag is not material/character' do
-        general_tag_name = TagName.create!(name: 'material_create_general_tag')
-        Tag.create!(tag_name: general_tag_name, category: :general)
-
-        post '/materials', params: {
-          tag: 'material_create_general_tag',
-          file: dummy_upload
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-      end
-
-      it 'persists url-only material' do
-        expect do
-          post '/materials', params: {
-            tag: 'material_create_url_only',
-            url: 'https://example.com/material-source'
-          }
-        end.to change(Material, :count).by(1)
-
-        expect(response).to have_http_status(:created)
-
-        material = Material.order(:id).last
-        expect(material.tag.name).to eq('material_create_url_only')
-        expect(material.url).to eq('https://example.com/material-source')
-        expect(material.file.attached?).to be(false)
-      end
-
-      it 'returns the original url for url-only material' do
-        post '/materials', params: {
-          tag: 'material_create_url_only_response',
-          url: 'https://example.com/material-source'
-        }
-
-        expect(response).to have_http_status(:created)
-        expect(json['url']).to eq('https://example.com/material-source')
-      end
-    end
-  end
-
-  describe 'PUT /materials/:id' do
-    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_update_old'), category: :material) }
-    let!(:material) do
-      build_material(tag:, user: member_user, file: dummy_upload(filename: 'old.png'))
-    end
-
-    context 'when not logged in' do
-      before { sign_out }
-
-      it 'returns 401' do
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_new',
-          file: dummy_upload(filename: 'new.png')
-        }
-
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'when logged in but not member' do
-      before { sign_in_as(guest_user) }
-
-      it 'returns 403' do
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_new',
-          file: dummy_upload(filename: 'new.png')
-        }
-
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'when member' do
-      before { sign_in_as(member_user) }
-
-      it 'returns 404 when material does not exist' do
-        put '/materials/999999999', params: {
-          tag: 'material_update_missing',
-          file: dummy_upload
-        }
-
-        expect(response).to have_http_status(:not_found)
-      end
-
-      it 'returns 400 when tag is blank' do
-        put "/materials/#{ material.id }", params: {
-          tag: '   ',
-          file: dummy_upload
-        }
-
-        expect(response).to have_http_status(:bad_request)
-      end
-
-      it 'returns 400 when both file and url are blank' do
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_no_payload'
-        }
-
-        expect(response).to have_http_status(:bad_request)
-      end
-
-      it 'updates tag, url, file, and updated_by_user' do
-        old_blob_id = material.file.blob.id
-
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_new',
-          url: 'https://example.com/updated-source',
-          file: dummy_upload(filename: 'updated.jpg', type: 'image/jpeg')
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        material.reload
-        expect(material.tag.name).to eq('material_update_new')
-        expect(material.tag.category).to eq('material')
-        expect(material.url).to eq('https://example.com/updated-source')
-        expect(material.updated_by_user).to eq(member_user)
-        expect(material.file.attached?).to be(true)
-        expect(material.file.blob.id).not_to eq(old_blob_id)
-        expect(material.file.blob.filename.to_s).to eq('updated.jpg')
-        expect(material.file.blob.content_type).to eq('image/jpeg')
-
-        expect(json['id']).to eq(material.id)
-        expect(json['file']).to be_present
-        expect(json['content_type']).to eq('image/jpeg')
-        expect(json.dig('tag', 'name')).to eq('material_update_new')
-      end
-
-      it 'purges the existing file when file is omitted and url is provided' do
-        old_blob_id = material.file.blob.id
-
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_remove_file',
-          url: 'https://example.com/updated-source'
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        material.reload
-        expect(material.tag.name).to eq('material_update_remove_file')
-        expect(material.url).to eq('https://example.com/updated-source')
-        expect(material.updated_by_user).to eq(member_user)
-        expect(material.file.attached?).to be(false)
-
-        expect(
-          ActiveStorage::Blob.where(id: old_blob_id).exists?
-        ).to be(false)
-
-        expect(json['id']).to eq(material.id)
-        expect(json['file']).to be_nil
-        expect(json['content_type']).to be_nil
-        expect(json.dig('tag', 'name')).to eq('material_update_remove_file')
-        expect(json['url']).to eq('https://example.com/updated-source')
-      end
-    end
-  end
-
-  describe 'DELETE /materials/:id' do
-    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_destroy'), category: :material) }
-    let!(:material) do
-      build_material(tag:, user: member_user, file: dummy_upload(filename: 'destroy.png'))
-    end
-
-    context 'when not logged in' do
-      before { sign_out }
-
-      it 'returns 401' do
-        delete "/materials/#{ material.id }"
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'when logged in but not member' do
-      before { sign_in_as(guest_user) }
-
-      it 'returns 403' do
-        delete "/materials/#{ material.id }"
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'when member' do
-      before { sign_in_as(member_user) }
-
-      it 'returns 404 when material does not exist' do
-        delete '/materials/999999999'
-        expect(response).to have_http_status(:not_found)
-      end
-
-      it 'discards the material and returns 204' do
-        delete "/materials/#{ material.id }"
-
-        expect(response).to have_http_status(:no_content)
-        expect(Material.find_by(id: material.id)).to be_nil
-        expect(Material.with_discarded.find(material.id)).to be_discarded
-      end
-    end
-  end
-end

backend/spec/requests/nico_tags_spec.rb

@@ -14,7 +14,6 @@ RSpec.describe 'NicoTags', type: :request do
 
   describe 'PATCH /tags/nico/:id' do
     let(:member) { create(:user, :member) }
-    let(:admin) { create(:user, :admin) }
     let(:nico_tag) { create(:tag, :nico) }
 
     it '401 when not logged in' do
@@ -35,59 +34,5 @@ RSpec.describe 'NicoTags', type: :request do
       patch "/tags/nico/#{non_nico.id}", params: { tags: 'a b' }
       expect(response).to have_http_status(:bad_request)
     end
-
-    it '200 and updates linked tags while recording tag versions' do
-      sign_in_as(admin)
-
-      nico_tag_name = TagName.create!(name: 'nico:nico_tags_spec_source')
-      nico_tag = Tag.create!(tag_name: nico_tag_name, category: :nico)
-
-      linked_a_name = TagName.create!(name: 'nico_linked_a')
-      linked_a = Tag.create!(tag_name: linked_a_name, category: :general)
-
-      linked_b_name = TagName.create!(name: 'nico_linked_b')
-      linked_b = Tag.create!(tag_name: linked_b_name, category: :general)
-
-      TagVersioning.ensure_snapshot!(nico_tag, created_by_user: admin)
-
-      expect {
-        patch "/tags/nico/#{nico_tag.id}", params: {
-          tags: "  #{linked_a.name}\n#{linked_b.name}  "
-        }
-      }.to change(TagVersion, :count).by(2)
-       .and change(NicoTagVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      names = json.map { |t| t['name'] }
-      expect(names).to match_array(['nico_linked_a', 'nico_linked_b'])
-
-      linked_versions = TagVersion.where(tag: [linked_a, linked_b]).order(:tag_id)
-      expect(linked_versions.map(&:event_type)).to eq(['create', 'create'])
-      expect(linked_versions.map(&:created_by_user_id)).to all(eq(admin.id))
-
-      versions = nico_tag.reload.nico_tag_versions.order(:version_no)
-      expect(versions.map(&:event_type)).to eq(['create', 'update'])
-      expect(versions.last.linked_tags.split).to match_array([
-        'nico_linked_a',
-        'nico_linked_b'
-      ])
-      expect(versions.last.created_by_user_id).to eq(admin.id)
-    end
-
-    it '400 when linked tag normalises to nico tag' do
-      sign_in_as(member)
-
-      other_nico = create(:tag, :nico, name: 'nico:linked_ng')
-      TagName.create!(name: 'linked_ng_alias', canonical: other_nico.tag_name)
-
-      TagVersioning.ensure_snapshot!(nico_tag, created_by_user: member)
-
-      expect {
-        patch "/tags/nico/#{nico_tag.id}", params: { tags: 'linked_ng_alias' }
-      }.not_to change(NicoTagVersion, :count)
-
-      expect(response).to have_http_status(:bad_request)
-    end
   end
 end

backend/spec/requests/posts_spec.rb

@@ -1,8 +1,8 @@
+include ActiveSupport::Testing::TimeHelpers
+
 require 'rails_helper'
 require 'set'
 
-include ActiveSupport::Testing::TimeHelpers
-
 RSpec.describe 'Posts API', type: :request do
   # create / update で thumbnail.attach は走るが、
   # resized_thumbnail! が MiniMagick 依存でコケやすいので request spec ではスタブしとくのが無難。
@@ -16,7 +16,7 @@ RSpec.describe 'Posts API', type: :request do
   end
 
   let!(:tag_name) { TagName.create!(name: 'spec_tag') }
-  let!(:tag)      { Tag.create!(tag_name: tag_name, category: :general) }
+  let!(:tag)      { Tag.create!(tag_name: tag_name, category: 'general') }
 
   let!(:post_record) do
     Post.create!(title: 'spec post', url: 'https://example.com/spec').tap do |p|
@@ -28,9 +28,9 @@ RSpec.describe 'Posts API', type: :request do
     let!(:user) { create_member_user! }
 
     let!(:tag_name) { TagName.create!(name: "spec_tag") }
-    let!(:tag) { Tag.create!(tag_name:, category: :general) }
+    let!(:tag) { Tag.create!(tag_name:, category: "general") }
     let!(:tag_name2) { TagName.create!(name: 'unko') }
-    let!(:tag2) { Tag.create!(tag_name: tag_name2, category: :deerjikist) }
+    let!(:tag2) { Tag.create!(tag_name: tag_name2, category: 'deerjikist') }
     let!(:alias_tag_name) { TagName.create!(name: 'manko', canonical: tag_name) }
 
     let!(:hit_post) do
@@ -116,123 +116,6 @@ RSpec.describe 'Posts API', type: :request do
       end
     end
 
-    context 'when tags contain not:' do
-      let!(:foo_tag_name) { TagName.create!(name: 'not_spec_foo') }
-      let!(:foo_tag) { Tag.create!(tag_name: foo_tag_name, category: :general) }
-
-      let!(:bar_tag_name) { TagName.create!(name: 'not_spec_bar') }
-      let!(:bar_tag) { Tag.create!(tag_name: bar_tag_name, category: :general) }
-
-      let!(:baz_tag_name) { TagName.create!(name: 'not_spec_baz') }
-      let!(:baz_tag) { Tag.create!(tag_name: baz_tag_name, category: :general) }
-
-      let!(:foo_alias_tag_name) do
-        TagName.create!(name: 'not_spec_foo_alias', canonical: foo_tag_name)
-      end
-
-      let!(:foo_only_post) do
-        Post.create!(uploaded_user: user, title: 'foo only',
-                     url: 'https://example.com/not-spec-foo').tap do |p|
-          PostTag.create!(post: p, tag: foo_tag)
-        end
-      end
-
-      let!(:bar_only_post) do
-        Post.create!(uploaded_user: user, title: 'bar only',
-                     url: 'https://example.com/not-spec-bar').tap do |p|
-          PostTag.create!(post: p, tag: bar_tag)
-        end
-      end
-
-      let!(:baz_only_post) do
-        Post.create!(uploaded_user: user, title: 'baz only',
-                     url: 'https://example.com/not-spec-baz').tap do |p|
-          PostTag.create!(post: p, tag: baz_tag)
-        end
-      end
-
-      let!(:foo_bar_post) do
-        Post.create!(uploaded_user: user, title: 'foo bar',
-                     url: 'https://example.com/not-spec-foo-bar').tap do |p|
-          PostTag.create!(post: p, tag: foo_tag)
-          PostTag.create!(post: p, tag: bar_tag)
-        end
-      end
-
-      let!(:foo_baz_post) do
-        Post.create!(uploaded_user: user, title: 'foo baz',
-                     url: 'https://example.com/not-spec-foo-baz').tap do |p|
-          PostTag.create!(post: p, tag: foo_tag)
-          PostTag.create!(post: p, tag: baz_tag)
-        end
-      end
-
-      let(:controlled_ids) do
-        [foo_only_post.id, bar_only_post.id, baz_only_post.id,
-         foo_bar_post.id, foo_baz_post.id]
-      end
-
-      it 'supports not search' do
-        get '/posts', params: { tags: 'not:not_spec_foo' }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json.fetch('posts').map { |p| p['id'] } & controlled_ids).to match_array(
-          [bar_only_post.id, baz_only_post.id]
-        )
-      end
-
-      it 'supports alias in not search' do
-        get '/posts', params: { tags: 'not:not_spec_foo_alias' }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json.fetch('posts').map { |p| p['id'] } & controlled_ids).to match_array(
-          [bar_only_post.id, baz_only_post.id]
-        )
-      end
-
-      it 'treats multiple not terms as AND when match is omitted' do
-        get '/posts', params: { tags: 'not:not_spec_foo not:not_spec_bar' }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json.fetch('posts').map { |p| p['id'] } & controlled_ids).to match_array(
-          [baz_only_post.id]
-        )
-      end
-
-      it 'treats multiple not terms as OR when match=any' do
-        get '/posts', params: { tags: 'not:not_spec_foo not:not_spec_bar', match: 'any' }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json.fetch('posts').map { |p| p['id'] } & controlled_ids).to match_array(
-          [foo_only_post.id, bar_only_post.id, baz_only_post.id, foo_baz_post.id]
-        )
-      end
-
-      it 'supports mixed positive and negative search with AND' do
-        get '/posts', params: { tags: 'not_spec_foo not:not_spec_bar' }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json.fetch('posts').map { |p| p['id'] } & controlled_ids).to match_array(
-          [foo_only_post.id, foo_baz_post.id]
-        )
-      end
-
-      it 'supports mixed positive and negative search with OR when match=any' do
-        get '/posts', params: { tags: 'not_spec_foo not:not_spec_bar', match: 'any' }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json.fetch('posts').map { |p| p['id'] } & controlled_ids).to match_array(
-          [foo_only_post.id, baz_only_post.id, foo_bar_post.id, foo_baz_post.id]
-        )
-      end
-    end
-
     context 'when url is provided' do
       let!(:url_hit_post) do
         Post.create!(uploaded_user: user, title: 'url hit',
@@ -525,9 +408,8 @@ RSpec.describe 'Posts API', type: :request do
 
     context "when nico tag already exists in tags" do
       before do
-        Tag.find_undiscard_or_create_by!(
+        Tag.find_or_create_by!(tag_name: TagName.find_or_create_by!(name: 'nico:nico_tag'),
-            tag_name: TagName.find_undiscard_or_create_by!(name: 'nico:nico_tag'),
+                               category: 'nico')
-            category: :nico)
       end
 
       it 'return 400' do
@@ -593,7 +475,7 @@ RSpec.describe 'Posts API', type: :request do
 
       # 追加で別タグも作って、更新時に入れ替わることを見る
       tn2 = TagName.create!(name: 'spec_tag_2')
-      Tag.create!(tag_name: tn2, category: :general)
+      Tag.create!(tag_name: tn2, category: 'general')
 
       put "/posts/#{post_record.id}", params: {
         title: 'updated title',
@@ -611,9 +493,8 @@ RSpec.describe 'Posts API', type: :request do
 
     context "when nico tag already exists in tags" do
       before do
-        Tag.find_undiscard_or_create_by!(
+        Tag.find_or_create_by!(tag_name: TagName.find_or_create_by!(name: 'nico:nico_tag'),
-            tag_name: TagName.find_undiscard_or_create_by!(name: 'nico:nico_tag'),
+                               category: 'nico')
-            category: :nico)
       end
 
       it 'return 400' do
@@ -650,7 +531,7 @@ RSpec.describe 'Posts API', type: :request do
     it 'returns add/remove events (history) for a post' do
       # add
       tn2 = TagName.create!(name: 'spec_tag2')
-      tag2 = Tag.create!(tag_name: tn2, category: :general)
+      tag2 = Tag.create!(tag_name: tn2, category: 'general')
       pt = PostTag.create!(post: post_record, tag: tag2, created_user: member)
 
       # remove (discard)
@@ -667,305 +548,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(types).to include('add')
       expect(types).to include('remove')
     end
-
-    it 'filters history by tag' do
-      tn2 = TagName.create!(name: 'history_tag_hit')
-      tag2 = Tag.create!(tag_name: tn2, category: :general)
-
-      tn3 = TagName.create!(name: 'history_tag_miss')
-      tag3 = Tag.create!(tag_name: tn3, category: :general)
-
-      other_post = Post.create!(
-        title: 'other post',
-        url: 'https://example.com/history-other'
-      )
-
-      # hit: add
-      PostTag.create!(post: post_record, tag: tag2, created_user: member)
-
-      # hit: add + remove
-      pt2 = PostTag.create!(post: other_post, tag: tag2, created_user: member)
-      pt2.discard_by!(member)
-
-      # miss: add + remove
-      pt3 = PostTag.create!(post: post_record, tag: tag3, created_user: member)
-      pt3.discard_by!(member)
-
-      get '/posts/changes', params: { tag: tag2.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('changes', 'count')
-      expect(json['count']).to eq(3)
-
-      changes = json.fetch('changes')
-
-      expect(changes.map { |e| e.dig('tag', 'id') }.uniq).to eq([tag2.id])
-      expect(changes.map { |e| e['change_type'] }).to match_array(%w[add add remove])
-      expect(changes.map { |e| e.dig('post', 'id') }).to match_array([
-        post_record.id,
-        other_post.id,
-        other_post.id
-      ])
-    end
-
-    it 'filters history by post and tag together' do
-      tn2 = TagName.create!(name: 'history_tag_combo_hit')
-      tag2 = Tag.create!(tag_name: tn2, category: :general)
-
-      tn3 = TagName.create!(name: 'history_tag_combo_miss')
-      tag3 = Tag.create!(tag_name: tn3, category: :general)
-
-      other_post = Post.create!(
-        title: 'other combo post',
-        url: 'https://example.com/history-combo-other'
-      )
-
-      # hit
-      PostTag.create!(post: post_record, tag: tag2, created_user: member)
-
-      # miss by post
-      pt2 = PostTag.create!(post: other_post, tag: tag2, created_user: member)
-      pt2.discard_by!(member)
-
-      # miss by tag
-      pt3 = PostTag.create!(post: post_record, tag: tag3, created_user: member)
-      pt3.discard_by!(member)
-
-      get '/posts/changes', params: { id: post_record.id, tag: tag2.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('changes', 'count')
-      expect(json['count']).to eq(1)
-
-      changes = json.fetch('changes')
-      expect(changes.size).to eq(1)
-      expect(changes[0]['change_type']).to eq('add')
-      expect(changes[0].dig('post', 'id')).to eq(post_record.id)
-      expect(changes[0].dig('tag', 'id')).to eq(tag2.id)
-    end
-
-    it 'returns empty history when tag does not match' do
-      tn2 = TagName.create!(name: 'history_tag_no_hit')
-      tag2 = Tag.create!(tag_name: tn2, category: :general)
-
-      get '/posts/changes', params: { tag: tag2.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('changes')).to eq([])
-      expect(json.fetch('count')).to eq(0)
-    end
-  end
-
-  describe 'GET /posts/versions' do
-    let(:member) { create(:user, :member, name: 'version member') }
-
-    let(:t_v1) { Time.zone.local(2020, 1, 1, 12, 0, 0) }
-    let(:t_v2) { Time.zone.local(2020, 1, 2, 12, 0, 0) }
-    let(:t_other) { Time.zone.local(2020, 1, 3, 12, 0, 0) }
-
-    let(:oc_from) { Time.zone.local(2019, 12, 31, 0, 0, 0) }
-    let(:oc_before) { Time.zone.local(2020, 1, 1, 0, 0, 0) }
-
-    let!(:tag_name2) { TagName.create!(name: 'spec_tag_2') }
-    let!(:tag2) { Tag.create!(tag_name: tag_name2, category: :general) }
-
-    def snapshot_tags(post)
-      post.snapshot_tag_names.join(' ')
-    end
-
-    def create_post_version!(post, version_no:, event_type:, created_by_user:, created_at:)
-      PostVersion.create!(
-        post: post,
-        version_no: version_no,
-        event_type: event_type,
-        title: post.title,
-        url: post.url,
-        thumbnail_base: post.thumbnail_base,
-        tags: snapshot_tags(post),
-        parent: post.parent,
-        original_created_from: post.original_created_from,
-        original_created_before: post.original_created_before,
-        created_at: created_at,
-        created_by_user: created_by_user
-      )
-    end
-
-    let!(:v1) do
-      travel_to(t_v1) do
-        create_post_version!(
-          post_record,
-          version_no: 1,
-          event_type: 'create',
-          created_by_user: member,
-          created_at: t_v1
-        )
-      end
-    end
-
-    let!(:v2) do
-      post_record.post_tags.kept.find_by!(tag: tag).discard_by!(member)
-      PostTag.create!(post: post_record, tag: tag2, created_user: member)
-      post_record.update!(
-        title: 'updated spec post',
-        original_created_from: oc_from,
-        original_created_before: oc_before
-      )
-
-      travel_to(t_v2) do
-        create_post_version!(
-          post_record.reload,
-          version_no: 2,
-          event_type: 'update',
-          created_by_user: member,
-          created_at: t_v2
-        )
-      end
-    end
-
-    let!(:other_post_version) do
-      other_post = Post.create!(
-        title: 'other versioned post',
-        url: 'https://example.com/other-versioned'
-      )
-      PostTag.create!(post: other_post, tag: tag)
-
-      travel_to(t_other) do
-        create_post_version!(
-          other_post,
-          version_no: 1,
-          event_type: 'create',
-          created_by_user: member,
-          created_at: t_other
-        )
-      end
-    end
-
-    it 'returns versions for the specified post in reverse chronological order' do
-      get '/posts/versions', params: { post: post_record.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('versions', 'count')
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.map { |v| v['post_id'] }.uniq).to eq([post_record.id])
-      expect(versions.map { |v| v['version_no'] }).to eq([2, 1])
-
-      latest = versions.first
-      expect(latest).to include(
-        'post_id' => post_record.id,
-        'version_no' => 2,
-        'event_type' => 'update',
-        'created_by_user' => {
-          'id' => member.id,
-          'name' => member.name
-        }
-      )
-
-      expect(latest.fetch('title')).to eq(
-        'current' => 'updated spec post',
-        'prev' => 'spec post'
-      )
-      expect(latest.fetch('url')).to eq(
-        'current' => 'https://example.com/spec',
-        'prev' => 'https://example.com/spec'
-      )
-      expect(latest.fetch('thumbnail')).to eq(
-        'current' => nil,
-        'prev' => nil
-      )
-      expect(latest.fetch('thumbnail_base')).to eq(
-        'current' => nil,
-        'prev' => nil
-      )
-      expect(latest.fetch('tags')).to include(
-        { 'name' => 'spec_tag_2', 'type' => 'added' },
-        { 'name' => 'spec_tag', 'type' => 'removed' }
-      )
-      expect(latest.fetch('original_created_from')).to eq(
-        'current' => oc_from.iso8601,
-        'prev' => nil
-      )
-      expect(latest.fetch('original_created_before')).to eq(
-        'current' => oc_before.iso8601,
-        'prev' => nil
-      )
-      expect(latest.fetch('created_at')).to eq(t_v2.iso8601)
-
-      first = versions.second
-      expect(first).to include(
-        'post_id' => post_record.id,
-        'version_no' => 1,
-        'event_type' => 'create',
-        'created_by_user' => {
-          'id' => member.id,
-          'name' => member.name
-        }
-      )
-      expect(first.fetch('title')).to eq(
-        'current' => 'spec post',
-        'prev' => nil
-      )
-      expect(first.fetch('tags')).to include(
-        { 'name' => 'spec_tag', 'type' => 'added' }
-      )
-      expect(first.fetch('created_at')).to eq(t_v1.iso8601)
-    end
-
-    it 'filters versions by tag when the current snapshot includes the tag' do
-      get '/posts/versions', params: { post: post_record.id, tag: tag2.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('count')).to eq(1)
-
-      versions = json.fetch('versions')
-      expect(versions.size).to eq(1)
-      expect(versions[0]['post_id']).to eq(post_record.id)
-      expect(versions[0]['version_no']).to eq(2)
-      expect(versions[0]['tags']).to include(
-        { 'name' => 'spec_tag_2', 'type' => 'added' }
-      )
-    end
-
-    it 'filters versions by tag when the tag exists in either current or previous snapshot' do
-      get '/posts/versions', params: { post: post_record.id, tag: tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.map { |v| v['post_id'] }).to all(eq(post_record.id))
-      expect(versions.map { |v| v['version_no'] }).to eq([2, 1])
-
-      latest = versions[0]
-      first = versions[1]
-
-      expect(latest['tags']).to include(
-        { 'name' => 'spec_tag', 'type' => 'removed' }
-      )
-      expect(first['tags']).to include(
-        { 'name' => 'spec_tag', 'type' => 'added' }
-      )
-    end
-
-    it 'returns empty when tag does not exist' do
-      get '/posts/versions', params: { tag: 999_999_999 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('versions')).to eq([])
-      expect(json.fetch('count')).to eq(0)
-    end
-
-    it 'clamps page and limit to at least 1' do
-      get '/posts/versions', params: { post: post_record.id, page: 0, limit: 0 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.size).to eq(1)
-      expect(versions[0]['version_no']).to eq(2)
-    end
   end
 
   describe 'POST /posts/:id/viewed' do
@@ -1007,176 +589,4 @@ RSpec.describe 'Posts API', type: :request do
       expect(user.reload.viewed?(post_record)).to be(false)
     end
   end
-
-  describe 'post versioning' do
-    let(:member) { create(:user, :member) }
-
-    def snapshot_tags(post)
-      post.snapshot_tag_names.join(' ')
-    end
-
-    def create_post_version_for!(post)
-      PostVersion.create!(
-        post: post,
-        version_no: 1,
-        event_type: 'create',
-        title: post.title,
-        url: post.url,
-        thumbnail_base: post.thumbnail_base,
-        tags: snapshot_tags(post),
-        parent: post.parent,
-        original_created_from: post.original_created_from,
-        original_created_before: post.original_created_before,
-        created_at: post.created_at,
-        created_by_user: post.uploaded_user
-      )
-    end
-
-    it 'creates version 1 on POST /posts' do
-      sign_in_as(member)
-
-      expect do
-        post '/posts', params: {
-          title: 'versioned post',
-          url: 'https://example.com/versioned-post',
-          tags: 'spec_tag',
-          thumbnail: dummy_upload
-        }
-      end.to change(PostVersion, :count).by(1)
-
-      expect(response).to have_http_status(:created)
-
-      created_post = Post.find(json.fetch('id'))
-      version = PostVersion.find_by!(post: created_post, version_no: 1)
-
-      expect(version.event_type).to eq('create')
-      expect(version.title).to eq('versioned post')
-      expect(version.url).to eq('https://example.com/versioned-post')
-      expect(version.created_by_user_id).to eq(member.id)
-      expect(version.tags).to eq(snapshot_tags(created_post))
-    end
-
-    it 'creates next version on PUT /posts/:id when snapshot changes' do
-      sign_in_as(member)
-      create_post_version_for!(post_record)
-
-      tag_name2 = TagName.create!(name: 'spec_tag_2')
-      Tag.create!(tag_name: tag_name2, category: :general)
-
-      expect do
-        put "/posts/#{post_record.id}", params: {
-          title: 'updated title',
-          tags: 'spec_tag_2'
-        }
-      end.to change(PostVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      version = post_record.reload.post_versions.order(:version_no).last
-      expect(version.version_no).to eq(2)
-      expect(version.event_type).to eq('update')
-      expect(version.title).to eq('updated title')
-      expect(version.created_by_user_id).to eq(member.id)
-      expect(version.tags).to eq(snapshot_tags(post_record.reload))
-    end
-
-    it 'does not create a new version on PUT /posts/:id when snapshot is unchanged' do
-      sign_in_as(member)
-
-      PostTag.create!(post: post_record, tag: Tag.no_deerjikist)
-      create_post_version_for!(post_record.reload)
-
-      expect {
-        put "/posts/#{post_record.id}", params: {
-          title: post_record.title,
-          tags: 'spec_tag'
-        }
-      }.not_to change(PostVersion, :count)
-      expect(response).to have_http_status(:ok)
-
-      version = post_record.reload.post_versions.order(:version_no).last
-      expect(version.version_no).to eq(1)
-      expect(version.event_type).to eq('create')
-      expect(version.tags).to eq(snapshot_tags(post_record))
-    end
-
-    it 'does not create a version when POST /posts is invalid' do
-      sign_in_as(member)
-
-      expect do
-        post '/posts', params: {
-          title: 'invalid post',
-          url: 'ぼざクリタグ広場',
-          tags: 'spec_tag',
-          thumbnail: dummy_upload
-        }
-      end.not_to change(PostVersion, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'does not create a version when PUT /posts/:id is invalid' do
-      sign_in_as(member)
-      create_post_version_for!(post_record)
-
-      expect do
-        put "/posts/#{post_record.id}", params: {
-          title: 'updated title',
-          tags: 'spec_tag',
-          original_created_from: Time.zone.local(2020, 1, 2, 0, 0, 0).iso8601,
-          original_created_before: Time.zone.local(2020, 1, 1, 0, 0, 0).iso8601
-        }
-      end.not_to change(PostVersion, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-  end
-
-  describe 'tag versioning from post write actions' do
-    let(:member) { create(:user, :member) }
-
-    it 'creates tag snapshot for normalised tags on POST /posts' do
-      sign_in_as(member)
-
-      expect {
-        post '/posts', params: {
-          title: 'tag versioned post',
-          url: 'https://example.com/tag-versioned-post',
-          tags: 'spec_tag',
-          thumbnail: dummy_upload
-        }
-      }.to change { tag.reload.tag_versions.count }.by(1)
-
-      expect(response).to have_http_status(:created)
-
-      version = tag.reload.tag_versions.order(:version_no).last
-      expect(version.version_no).to eq(1)
-      expect(version.event_type).to eq('create')
-      expect(version.name).to eq('spec_tag')
-      expect(version.category).to eq('general')
-      expect(version.created_by_user_id).to eq(member.id)
-    end
-
-    it 'creates tag snapshot for normalised tags on PUT /posts/:id' do
-      sign_in_as(member)
-
-      tag_name2 = TagName.create!(name: 'spec_tag_2')
-      tag2 = Tag.create!(tag_name: tag_name2, category: :general)
-
-      expect {
-        put "/posts/#{post_record.id}", params: {
-          title: 'updated title',
-          tags: 'spec_tag_2'
-        }
-      }.to change { tag2.reload.tag_versions.count }.by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      version = tag2.reload.tag_versions.order(:version_no).last
-      expect(version.version_no).to eq(1)
-      expect(version.event_type).to eq('create')
-      expect(version.name).to eq('spec_tag_2')
-      expect(version.created_by_user_id).to eq(member.id)
-    end
-  end
 end

backend/spec/requests/tag_children_spec.rb

@@ -58,47 +58,15 @@ RSpec.describe "TagChildren", type: :request do
       end
     end
 
-    context "when Tag.find raises (invalid ids)" do
+    context "when Tag.find raises (invalid ids) it still returns 204" do
       before { stub_current_user(admin) }
 
       let(:parent_id) { -1 }
       let(:child_id) { -1 }
 
-      it "returns 404" do
+      it "returns 204 (rescue nil)" do
         do_request
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:no_content)
-      end
-    end
-
-    context 'when parent is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:parent) { create(:tag, :nico, name: 'nico:parent_ng') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400 and does not create relation' do
-        expect {
-          do_request
-        }.not_to change(TagImplication, :count)
-
-        expect(response).to have_http_status(:bad_request)
-      end
-    end
-
-    context 'when child is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:child) { create(:tag, :nico, name: 'nico:child_ng') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400 and does not create relation' do
-        expect {
-          do_request
-        }.not_to change(TagImplication, :count)
-
-        expect(response).to have_http_status(:bad_request)
       end
     end
   end
@@ -148,57 +116,17 @@ RSpec.describe "TagChildren", type: :request do
 
         expect(response).to have_http_status(:no_content)
       end
-
-      it 'records create and update versions for child tag' do
-        expect {
-          do_request
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:no_content)
-
-        versions = child.reload.tag_versions.order(:version_no)
-        expect(versions.map(&:event_type)).to eq(['create', 'update'])
-        expect(versions.first.parent_tag_ids.split).to include(parent.id.to_s)
-        expect(versions.second.parent_tag_ids).to eq('')
-        expect(versions.second.created_by_user_id).to eq(admin.id)
-      end
     end
 
-    context "when Tag.find raises (invalid ids)" do
+    context "when Tag.find raises (invalid ids) it still returns 204" do
       before { stub_current_user(admin) }
 
       let(:parent_id) { -1 }
       let(:child_id) { -1 }
 
-      it "returns 404" do
+      it "returns 204 (rescue nil)" do
         do_request
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:no_content)
-      end
-    end
-
-    context 'when parent is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:parent) { create(:tag, :nico, name: 'nico:parent_ng_delete') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400' do
-        do_request
-        expect(response).to have_http_status(:bad_request)
-      end
-    end
-
-    context 'when child is nico' do
-      before { stub_current_user(admin) }
-
-      let!(:child) { create(:tag, :nico, name: 'nico:child_ng_delete') }
-      let(:parent_id) { parent.id }
-      let(:child_id) { child.id }
-
-      it 'returns 400' do
-        do_request
-        expect(response).to have_http_status(:bad_request)
       end
     end
   end

backend/spec/requests/tag_versions_spec.rb

@@ -1,243 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'TagVersions API', type: :request do
-  let(:member) { create(:user, :member, name: 'version member') }
-
-  let!(:tag) { create(:tag, name: 'tag_versions_target', category: :general) }
-  let!(:other_tag) { create(:tag, name: 'tag_versions_other', category: :general) }
-
-  let!(:parent_shared) { create(:tag, name: 'parent_shared', category: :general) }
-  let!(:parent_old) { create(:tag, name: 'parent_old', category: :general) }
-  let!(:parent_new) { create(:tag, name: 'parent_new', category: :general) }
-  let!(:other_parent) { create(:tag, name: 'other_parent', category: :general) }
-
-  let(:t_v1) { Time.zone.local(2020, 1, 1, 12, 0, 0) }
-  let(:t_v2) { Time.zone.local(2020, 1, 2, 12, 0, 0) }
-  let(:t_other) { Time.zone.local(2020, 1, 3, 12, 0, 0) }
-
-  def create_tag_version!(
-    tag:,
-    version_no:,
-    event_type:,
-    name:,
-    category:,
-    aliases: [],
-    parent_tags: [],
-    created_by_user:,
-    created_at:
-  )
-    TagVersion.create!(
-      tag: tag,
-      version_no: version_no,
-      event_type: event_type,
-      name: name,
-      category: category,
-      aliases: Array(aliases).join(' '),
-      parent_tag_ids: Array(parent_tags).map(&:id).join(' '),
-      created_by_user: created_by_user,
-      created_at: created_at
-    )
-  end
-
-  let!(:v1) do
-    create_tag_version!(
-      tag: tag,
-      version_no: 1,
-      event_type: 'create',
-      name: 'old_tag_name',
-      category: 'general',
-      aliases: ['alias_shared', 'alias_old'],
-      parent_tags: [parent_shared, parent_old],
-      created_by_user: member,
-      created_at: t_v1
-    )
-  end
-
-  let!(:v2) do
-    create_tag_version!(
-      tag: tag,
-      version_no: 2,
-      event_type: 'update',
-      name: 'new_tag_name',
-      category: 'meme',
-      aliases: ['alias_shared', 'alias_new'],
-      parent_tags: [parent_shared, parent_new],
-      created_by_user: member,
-      created_at: t_v2
-    )
-  end
-
-  let!(:other_v1) do
-    create_tag_version!(
-      tag: other_tag,
-      version_no: 1,
-      event_type: 'create',
-      name: 'other_tag_name',
-      category: 'general',
-      aliases: ['other_alias'],
-      parent_tags: [other_parent],
-      created_by_user: member,
-      created_at: t_other
-    )
-  end
-
-  describe 'GET /tags/versions' do
-    it 'returns all versions in reverse chronological order when id is omitted' do
-      get '/tags/versions'
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('versions', 'count')
-      expect(json.fetch('count')).to eq(3)
-
-      versions = json.fetch('versions')
-
-      expect(versions.map { |v| [v['tag_id'], v['version_no']] }).to eq([
-        [other_tag.id, 1],
-        [tag.id, 2],
-        [tag.id, 1]
-      ])
-    end
-
-    it 'returns versions for the specified tag with diffs' do
-      get '/tags/versions', params: { id: tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('versions', 'count')
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.map { |v| v['tag_id'] }.uniq).to eq([tag.id])
-      expect(versions.map { |v| v['version_no'] }).to eq([2, 1])
-
-      latest = versions.first
-      expect(latest).to include(
-        'tag_id' => tag.id,
-        'version_no' => 2,
-        'event_type' => 'update',
-        'created_by_user' => {
-          'id' => member.id,
-          'name' => member.name
-        }
-      )
-
-      expect(latest.fetch('name')).to eq(
-        'current' => 'new_tag_name',
-        'prev' => 'old_tag_name'
-      )
-      expect(latest.fetch('category')).to eq(
-        'current' => 'meme',
-        'prev' => 'general'
-      )
-      expect(latest.fetch('aliases')).to include(
-        { 'name' => 'alias_shared', 'type' => 'context' },
-        { 'name' => 'alias_new', 'type' => 'added' },
-        { 'name' => 'alias_old', 'type' => 'removed' }
-      )
-      expect(latest.fetch('parent_tags')).to include(
-        a_hash_including(
-          'type' => 'context',
-          'tag' => a_hash_including(
-            'id' => parent_shared.id
-          )
-        ),
-        a_hash_including(
-          'type' => 'added',
-          'tag' => a_hash_including(
-            'id' => parent_new.id
-          )
-        ),
-        a_hash_including(
-          'type' => 'removed',
-          'tag' => a_hash_including(
-            'id' => parent_old.id
-          )
-        )
-      )
-      expect(latest.fetch('created_at')).to eq(t_v2.iso8601)
-
-      first = versions.second
-      expect(first).to include(
-        'tag_id' => tag.id,
-        'version_no' => 1,
-        'event_type' => 'create',
-        'created_by_user' => {
-          'id' => member.id,
-          'name' => member.name
-        }
-      )
-      expect(first.fetch('name')).to eq(
-        'current' => 'old_tag_name',
-        'prev' => nil
-      )
-      expect(first.fetch('category')).to eq(
-        'current' => 'general',
-        'prev' => nil
-      )
-      expect(first.fetch('aliases')).to include(
-        { 'name' => 'alias_shared', 'type' => 'added' },
-        { 'name' => 'alias_old', 'type' => 'added' }
-      )
-      expect(first.fetch('parent_tags')).to include(
-        a_hash_including(
-          'type' => 'added',
-          'tag' => a_hash_including(
-            'id' => parent_shared.id
-          )
-        ),
-        a_hash_including(
-          'type' => 'added',
-          'tag' => a_hash_including(
-            'id' => parent_old.id
-          )
-        )
-      )
-      expect(first.fetch('created_at')).to eq(t_v1.iso8601)
-    end
-
-    it 'returns empty when the specified tag has no versions' do
-      fresh_tag = create(:tag, name: 'no_versions_tag', category: :general)
-
-      get '/tags/versions', params: { id: fresh_tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('versions')).to eq([])
-      expect(json.fetch('count')).to eq(0)
-    end
-
-    it 'clamps page and limit to at least 1' do
-      get '/tags/versions', params: { id: tag.id, page: 0, limit: 0 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('count')).to eq(2)
-
-      versions = json.fetch('versions')
-      expect(versions.size).to eq(1)
-      expect(versions.first['version_no']).to eq(2)
-    end
-
-    it 'does not create tag versions by wiki updates when tag has no versions yet' do
-      wiki_tag_name = TagName.create!(name: 'tag_versions_from_wiki')
-      wiki_tag = Tag.create!(tag_name: wiki_tag_name, category: :general)
-
-      wiki_page =
-          Wiki::Commit.create_content!(
-              tag_name: wiki_tag_name,
-              body: 'before',
-              created_by_user: member,
-              message: 'init')
-
-      Wiki::Commit.content!(
-          page: wiki_page,
-          body: 'after',
-          created_user: member,
-          message: 'edit',
-          base_revision_id: wiki_page.current_revision.id)
-
-      get '/tags/versions', params: { id: wiki_tag.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('versions')).to eq([])
-      expect(json.fetch('count')).to eq(0)
-    end
-  end
-end

backend/spec/requests/tag_wiki_history_integrity_spec.rb

@@ -1,160 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Tag and wiki history integrity', type: :request do
-  let(:member_user) { create(:user, role: 'member') }
-
-  def stub_current_user user
-    allow_any_instance_of(ApplicationController).to receive(:current_user).and_return(user)
-  end
-
-  def create_tag! name:, category: :general
-    tag_name = TagName.create!(name:)
-    Tag.create!(tag_name:, category:)
-  end
-
-  def create_wiki_for_tag! tag:, body: 'wiki body', user: member_user
-    Wiki::Commit.create_content!(
-        tag_name: tag.tag_name,
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  before do
-    stub_current_user(member_user)
-  end
-
-  describe 'PATCH /tags/:id' do
-    it 'records wiki_version when tag name changes and tag has wiki' do
-      tag = create_tag!(name: 'patch_tag_wiki_before')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      expect {
-        patch "/tags/#{ tag.id }", params: {
-          name: 'patch_tag_wiki_after',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-      version = wiki_page.wiki_versions.order(:version_no).last
-
-      expect(tag.name).to eq('patch_tag_wiki_after')
-      expect(wiki_page.title).to eq('patch_tag_wiki_after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'patch_tag_wiki_after',
-        body: 'wiki body before',
-        created_by_user_id: member_user.id
-      )
-    end
-
-    it 'does not record wiki_version when only category changes' do
-      tag = create_tag!(name: 'patch_tag_category_only')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      before_wiki_versions = wiki_page.wiki_versions.count
-
-      expect {
-        patch "/tags/#{ tag.id }", params: {
-          category: 'meme',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-
-      expect(tag.name).to eq('patch_tag_category_only')
-      expect(tag.category).to eq('meme')
-      expect(wiki_page.wiki_versions.count).to eq(before_wiki_versions)
-    end
-  end
-
-  describe 'PUT /tags/:id' do
-    it 'records wiki_version when tag name changes and tag has wiki' do
-      tag = create_tag!(name: 'put_tag_wiki_before')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      expect {
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_tag_wiki_after',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-      version = wiki_page.wiki_versions.order(:version_no).last
-
-      expect(tag.name).to eq('put_tag_wiki_after')
-      expect(wiki_page.title).to eq('put_tag_wiki_after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'put_tag_wiki_after',
-        body: 'wiki body before',
-        created_by_user_id: member_user.id
-      )
-    end
-
-    it 'does not record wiki_version when only category changes' do
-      tag = create_tag!(name: 'put_tag_category_only')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      before_wiki_versions = wiki_page.wiki_versions.count
-
-      expect {
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_tag_category_only',
-          category: 'meme',
-          aliases: '',
-          parent_tags: '',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-
-      expect(response).to have_http_status(:ok)
-
-      tag.reload
-      wiki_page.reload
-
-      expect(tag.name).to eq('put_tag_category_only')
-      expect(tag.category).to eq('meme')
-      expect(wiki_page.wiki_versions.count).to eq(before_wiki_versions)
-    end
-
-    it 'does not record wiki_version when only aliases change' do
-      tag = create_tag!(name: 'put_tag_alias_only')
-      wiki_page = create_wiki_for_tag!(tag:, body: 'wiki body before')
-
-      before_wiki_versions = wiki_page.wiki_versions.count
-
-      expect {
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_tag_alias_only',
-          category: 'general',
-          aliases: 'put_tag_alias_only_alias',
-          parent_tags: '',
-        }
-      }
-          .to change(TagVersion, :count).by(2)
-
-      expect(response).to have_http_status(:ok)
-      expect(wiki_page.reload.wiki_versions.count).to eq(before_wiki_versions)
-    end
-  end
-end

backend/spec/requests/theatre_comments_spec.rb

@@ -1,150 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'TheatreComments', type: :request do
-  def sign_in_as(user)
-    allow_any_instance_of(ApplicationController).to receive(:current_user).and_return(user)
-  end
-
-  describe 'GET /theatres/:theatre_id/comments' do
-    let(:theatre) { create(:theatre) }
-    let(:other_theatre) { create(:theatre) }
-    let(:alice) { create(:user, name: 'Alice') }
-    let(:bob) { create(:user, name: 'Bob') }
-
-    let!(:comment_3) do
-      create(
-        :theatre_comment,
-        theatre: theatre,
-        no: 3,
-        user: alice,
-        content: 'third comment'
-      )
-    end
-
-    let!(:comment_1) do
-      create(
-        :theatre_comment,
-        theatre: theatre,
-        no: 1,
-        user: alice,
-        content: 'first comment'
-      )
-    end
-
-    let!(:comment_2) do
-      create(
-        :theatre_comment,
-        theatre: theatre,
-        no: 2,
-        user: bob,
-        content: 'second comment'
-      )
-    end
-
-    let!(:other_comment) do
-      create(
-        :theatre_comment,
-        theatre: other_theatre,
-        no: 1,
-        user: bob,
-        content: 'other theatre comment'
-      )
-    end
-
-    it 'theatre_id で絞り込み、no_gt より大きいものを no 降順で返す' do
-      get "/theatres/#{theatre.id}/comments", params: { no_gt: 1 }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.parsed_body.map { |row| row['no'] }).to eq([3, 2])
-      expect(response.parsed_body.map { |row| row['content'] }).to eq([
-        'third comment',
-        'second comment'
-      ])
-    end
-
-    it 'user は id と name だけを含む' do
-      get "/theatres/#{theatre.id}/comments", params: { no_gt: 1 }
-
-      expect(response).to have_http_status(:ok)
-
-      expect(response.parsed_body.first['user']).to eq({
-        'id' => alice.id,
-        'name' => 'Alice'
-      })
-      expect(response.parsed_body.first['user'].keys).to contain_exactly('id', 'name')
-    end
-
-    it 'no_gt が負数なら 0 として扱う' do
-      get "/theatres/#{theatre.id}/comments", params: { no_gt: -100 }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.parsed_body.map { |row| row['no'] }).to eq([3, 2, 1])
-    end
-  end
-
-  describe 'POST /theatres/:theatre_id/comments' do
-    let(:user) { create(:user, name: 'Alice') }
-    let(:theatre) { create(:theatre, next_comment_no: 2) }
-
-    before do
-      create(
-        :theatre_comment,
-        theatre: theatre,
-        no: 1,
-        user: user,
-        content: 'existing comment'
-      )
-    end
-
-    it '未ログインなら 401 を返す' do
-      expect {
-        post "/theatres/#{theatre.id}/comments", params: { content: 'hello' }
-      }.not_to change(TheatreComment, :count)
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'content が blank なら 422 を返す' do
-      sign_in_as(user)
-
-      expect {
-        post "/theatres/#{theatre.id}/comments", params: { content: '   ' }
-      }.not_to change(TheatreComment, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'theatre が存在しなければ 404 を返す' do
-      sign_in_as(user)
-
-      expect {
-        post '/theatres/999999/comments', params: { content: 'hello' }
-      }.not_to change(TheatreComment, :count)
-
-      expect(response).to have_http_status(:not_found)
-    end
-
-    it 'コメントを作成し、user を紐づけ、next_comment_no を進める' do
-      sign_in_as(user)
-
-      expect {
-        post "/theatres/#{theatre.id}/comments", params: { content: 'new comment' }
-      }.to change(TheatreComment, :count).by(1)
-
-      expect(response).to have_http_status(:created)
-
-      comment = TheatreComment.find_by!(theatre: theatre, no: 2)
-
-      expect(comment.user).to eq(user)
-      expect(comment.content).to eq('new comment')
-      expect(theatre.reload.next_comment_no).to eq(3)
-
-      expect(response.parsed_body.slice('theatre_id', 'no', 'user_id', 'content')).to eq({
-        'theatre_id' => theatre.id,
-        'no' => 2,
-        'user_id' => user.id,
-        'content' => 'new comment'
-      })
-    end
-  end
-end

backend/spec/requests/theatres_spec.rb

@@ -1,307 +0,0 @@
-require 'rails_helper'
-require 'active_support/testing/time_helpers'
-
-
-RSpec.describe 'Theatres API', type: :request do
-  include ActiveSupport::Testing::TimeHelpers
-
-  around do |example|
-    travel_to(Time.zone.parse('2026-03-18 21:00:00')) do
-      example.run
-    end
-  end
-
-  let(:member) { create(:user, :member, name: 'member user') }
-  let(:other_user) { create(:user, :member, name: 'other user') }
-
-  let!(:youtube_post) do
-    Post.create!(
-      title: 'youtube post',
-      url: 'https://www.youtube.com/watch?v=spec123'
-    )
-  end
-
-  let!(:other_post) do
-    Post.create!(
-      title: 'other post',
-      url: 'https://example.com/posts/1'
-    )
-  end
-
-  let!(:theatre) do
-    Theatre.create!(
-      name: 'spec theatre',
-      opens_at: Time.zone.parse('2026-03-18 20:00:00'),
-      kind: 0,
-      created_by_user: member
-    )
-  end
-
-  describe 'GET /theatres/:id' do
-    subject(:do_request) do
-      get "/theatres/#{theatre_id}"
-    end
-
-    context 'when theatre exists' do
-      let(:theatre_id) { theatre.id }
-
-      it 'returns theatre json' do
-        do_request
-
-        expect(response).to have_http_status(:ok)
-        expect(json).to include(
-          'id' => theatre.id,
-          'name' => 'spec theatre'
-        )
-        expect(json).to have_key('opens_at')
-        expect(json).to have_key('closes_at')
-        expect(json).to have_key('created_at')
-        expect(json).to have_key('updated_at')
-
-        expect(json['created_by_user']).to include(
-          'id' => member.id,
-          'name' => 'member user'
-        )
-      end
-    end
-
-    context 'when theatre does not exist' do
-      let(:theatre_id) { 999_999_999 }
-
-      it 'returns 404' do
-        do_request
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-  end
-
-  describe 'PUT /theatres/:id/watching' do
-    subject(:do_request) do
-      put "/theatres/#{theatre_id}/watching"
-    end
-
-    let(:theatre_id) { theatre.id }
-
-    context 'when not logged in' do
-      it 'returns 401' do
-        sign_out
-        do_request
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'when theatre does not exist' do
-      let(:theatre_id) { 999_999_999 }
-
-      it 'returns 404' do
-        sign_in_as(member)
-        do_request
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    context 'when theatre has no host yet' do
-      before do
-        sign_in_as(member)
-      end
-
-      it 'creates watching row, assigns current user as host, and returns current theatre info' do
-        expect { do_request }
-          .to change { TheatreWatchingUser.count }.by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        theatre.reload
-        watch = TheatreWatchingUser.find_by!(theatre: theatre, user: member)
-
-        expect(theatre.host_user_id).to eq(member.id)
-        expect(watch.expires_at).to be_within(1.second).of(30.seconds.from_now)
-
-        expect(json).to include(
-          'host_flg' => true,
-          'post_id' => nil,
-          'post_started_at' => nil
-        )
-
-        expect(json.fetch('watching_users')).to contain_exactly(
-          {
-            'id' => member.id,
-            'name' => 'member user'
-          }
-        )
-      end
-    end
-
-    context 'when current user is already watching' do
-      let!(:watching_row) do
-        TheatreWatchingUser.create!(
-          theatre: theatre,
-          user: member,
-          expires_at: 5.seconds.from_now
-        )
-      end
-
-      before do
-        sign_in_as(member)
-      end
-
-      it 'refreshes expires_at without creating another row' do
-        expect { do_request }
-          .not_to change { TheatreWatchingUser.count }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(watching_row.reload.expires_at)
-          .to be_within(1.second).of(30.seconds.from_now)
-      end
-    end
-
-    context 'when another active host exists' do
-      before do
-        TheatreWatchingUser.create!(
-          theatre: theatre,
-          user: other_user,
-          expires_at: 10.minutes.from_now
-        )
-        theatre.update!(host_user: other_user)
-        sign_in_as(member)
-      end
-
-      it 'does not steal host and returns host_flg false' do
-        expect { do_request }
-          .to change { TheatreWatchingUser.count }.by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(theatre.reload.host_user_id).to eq(other_user.id)
-
-        expect(json).to include(
-          'host_flg' => false,
-          'post_id' => nil,
-          'post_started_at' => nil
-        )
-
-        expect(json.fetch('watching_users')).to contain_exactly(
-          {
-            'id' => member.id,
-            'name' => 'member user'
-          },
-          {
-            'id' => other_user.id,
-            'name' => 'other user'
-          }
-        )
-      end
-    end
-
-    context 'when host is set but no longer actively watching' do
-      let(:started_at) { 2.minutes.ago }
-
-      before do
-        TheatreWatchingUser.create!(
-          theatre: theatre,
-          user: other_user,
-          expires_at: 1.second.ago
-        )
-        theatre.update!(
-          host_user: other_user,
-          current_post: youtube_post,
-          current_post_started_at: started_at
-        )
-        sign_in_as(member)
-      end
-
-      it 'reassigns host to current user and returns current post info' do
-        expect { do_request }
-          .to change { TheatreWatchingUser.count }.by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        theatre.reload
-        expect(theatre.host_user_id).to eq(member.id)
-
-        expect(json['host_flg']).to eq(true)
-        expect(json['post_id']).to eq(youtube_post.id)
-        expect(Time.zone.parse(json['post_started_at']))
-          .to be_within(1.second).of(started_at)
-      end
-    end
-  end
-
-  describe 'PATCH /theatres/:id/next_post' do
-    subject(:do_request) do
-      patch "/theatres/#{theatre_id}/next_post"
-    end
-
-    let(:theatre_id) { theatre.id }
-
-    context 'when not logged in' do
-      it 'returns 401' do
-        sign_out
-        do_request
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'when theatre does not exist' do
-      let(:theatre_id) { 999_999_999 }
-
-      it 'returns 404' do
-        sign_in_as(member)
-        do_request
-        expect(response).to have_http_status(:not_found)
-      end
-    end
-
-    context 'when logged in but not host' do
-      before do
-        theatre.update!(host_user: other_user)
-        sign_in_as(member)
-      end
-
-      it 'returns 403' do
-        do_request
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'when current user is host' do
-      before do
-        theatre.update!(host_user: member)
-        sign_in_as(member)
-      end
-
-      it 'sets current_post to an eligible post and updates current_post_started_at' do
-        expect { do_request }
-          .to change { theatre.reload.current_post_id }
-          .from(nil).to(youtube_post.id)
-
-        expect(response).to have_http_status(:no_content)
-        expect(theatre.reload.current_post_started_at)
-          .to be_within(1.second).of(Time.current)
-      end
-    end
-
-    context 'when current user is host and no eligible post exists' do
-      before do
-        youtube_post.destroy!
-        theatre.update!(
-          host_user: member,
-          current_post: other_post,
-          current_post_started_at: 1.hour.ago
-        )
-        sign_in_as(member)
-      end
-
-      it 'still returns 204 and clears current_post' do
-        do_request
-
-        expect(response).to have_http_status(:no_content)
-
-        theatre.reload
-        expect(theatre.current_post_id).to be_nil
-        expect(theatre.current_post_started_at)
-          .to be_within(1.second).of(Time.current)
-      end
-    end
-  end
-end

backend/spec/requests/users_spec.rb

@@ -1,10 +1,11 @@
 require "rails_helper"
 
+
 RSpec.describe "Users", type: :request do
   describe "POST /users" do
     it "creates guest user and returns code" do
       post "/users"
-      expect(response).to have_http_status(:created)
+      expect(response).to have_http_status(:ok)
       expect(json["code"]).to be_present
       expect(json["user"]["role"]).to eq("guest")
     end
@@ -37,7 +38,7 @@ RSpec.describe "Users", type: :request do
       sign_in_as(user)
       put "/users/#{user.id}", params: { name: "new-name" }
 
-      expect(response).to have_http_status(:ok)
+      expect(response).to have_http_status(:created)
       expect(json["id"]).to eq(user.id)
       expect(json["name"]).to eq("new-name")
 

backend/spec/requests/wiki_body_search_pending_spec.rb

@@ -1,27 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki body search', type: :request do
-  let!(:user) { create_member_user! }
-
-  it 'searches wiki pages by body text' do
-    pending 'Wiki 本文検索実装時に有効化する'
-
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: 'wiki_body_search_hit'),
-        body: 'unique body keyword for wiki search',
-        created_by_user: user,
-        message: 'init')
-
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: 'wiki_body_search_miss'),
-        body: 'ordinary body',
-        created_by_user: user,
-        message: 'init')
-
-    get '/wiki/search', params: { body: 'unique body keyword' }
-
-    expect(response).to have_http_status(:ok)
-    expect(json.map { |page| page['title'] }).to include('wiki_body_search_hit')
-    expect(json.map { |page| page['title'] }).not_to include('wiki_body_search_miss')
-  end
-end

backend/spec/requests/wiki_conflict_spec.rb

@@ -1,42 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki conflict handling', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  it 'returns 409 when base_revision_id is stale' do
-    page =
-        Wiki::Commit.create_content!(
-            tag_name: TagName.create!(name: 'wiki_conflict_request'),
-            body: 'first',
-            created_by_user: user,
-            message: 'init')
-
-    stale_id = page.current_revision.id
-
-    Wiki::Commit.content!(
-        page:,
-        body: 'second',
-        created_user: user,
-        message: 'other edit',
-        base_revision_id: stale_id)
-
-    put "/wiki/#{ page.id }",
-        params: {
-          title: 'wiki_conflict_request',
-          body: 'third',
-          message: 'stale',
-          base_revision_id: stale_id,
-        },
-        headers: auth_headers(user)
-
-    expect(response).to have_http_status(:conflict)
-
-    page.reload
-    expect(page.body).to eq('second')
-    expect(page.current_revision.message).to eq('other edit')
-  end
-end

backend/spec/requests/wiki_history_integrity_spec.rb

@@ -1,196 +0,0 @@
-require 'cgi'
-require 'rails_helper'
-
-RSpec.describe 'Wiki history integrity', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  def create_wiki_page title:, body: 'body', message: 'init', user: self.user
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message:)
-  end
-
-  describe 'POST /wiki' do
-    it 'creates wiki_page, wiki_revision, and wiki_version atomically' do
-      expect {
-        post '/wiki',
-             params: {
-               title: 'wiki_history_create_atomic',
-               body: "a\nb\nc",
-               message: 'initial commit',
-             },
-             headers: auth_headers(user)
-      }
-          .to change(WikiPage, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:created)
-
-      page = WikiPage.find(json.fetch('id'))
-      revision = page.current_revision
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.title).to eq('wiki_history_create_atomic')
-      expect(page.body).to eq("a\nb\nc")
-
-      expect(revision).to be_content
-      expect(revision.message).to eq('initial commit')
-      expect(revision.lines_count).to eq(3)
-
-      expect(version).to have_attributes(
-        version_no: 1,
-        event_type: 'create',
-        title: 'wiki_history_create_atomic',
-        body: "a\nb\nc",
-        reason: 'initial commit',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'returns 422 and creates nothing when normalised body is blank' do
-      expect {
-        post '/wiki',
-             params: {
-               title: 'wiki_history_blank_body',
-               body: "\r\n\r\n",
-               message: 'blank',
-             },
-             headers: auth_headers(user)
-      }
-          .not_to change(WikiPage, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(WikiPage.joins(:tag_name).where(tag_names: { name: 'wiki_history_blank_body' })).not_to exist
-    end
-
-    it 'returns 422 and creates no partial page when title already exists' do
-      create_wiki_page(title: 'wiki_history_duplicate_title', body: 'first')
-
-      expect {
-        post '/wiki',
-             params: {
-               title: 'wiki_history_duplicate_title',
-               body: 'second',
-               message: 'duplicate',
-             },
-             headers: auth_headers(user)
-      }
-          .not_to change(WikiPage, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(WikiPage.joins(:tag_name).where(tag_names: { name: 'wiki_history_duplicate_title' }).count).to eq(1)
-    end
-  end
-
-  describe 'PUT /wiki/:id' do
-    it 'updates body and records wiki_revision and wiki_version' do
-      page = create_wiki_page(title: 'wiki_history_update_body', body: 'before')
-      current_id = page.current_revision.id
-
-      expect {
-        put "/wiki/#{ page.id }",
-            params: {
-              title: 'wiki_history_update_body',
-              body: 'after',
-              message: 'edit body',
-              base_revision_id: current_id,
-            },
-            headers: auth_headers(user)
-      }
-          .to change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.title).to eq('wiki_history_update_body')
-      expect(page.body).to eq('after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'wiki_history_update_body',
-        body: 'after',
-        reason: 'edit body',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'renames title and records wiki_version with new title' do
-      page = create_wiki_page(title: 'wiki_history_rename_before', body: 'before')
-      current_id = page.current_revision.id
-
-      expect {
-        put "/wiki/#{ page.id }",
-            params: {
-              title: 'wiki_history_rename_after',
-              body: 'after',
-              message: 'rename',
-              base_revision_id: current_id,
-            },
-            headers: auth_headers(user)
-      }
-          .to change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.title).to eq('wiki_history_rename_after')
-      expect(page.body).to eq('after')
-
-      expect(version).to have_attributes(
-        event_type: 'update',
-        title: 'wiki_history_rename_after',
-        body: 'after',
-        reason: 'rename',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'does not change title, body, revision, or version on stale base_revision_id' do
-      page = create_wiki_page(title: 'wiki_history_conflict_page', body: 'first')
-      stale_id = page.current_revision.id
-
-      Wiki::Commit.content!(
-          page:,
-          body: 'second',
-          created_user: user,
-          message: 'other edit',
-          base_revision_id: stale_id)
-
-      page.reload
-      current_title = page.title
-      current_body = page.body
-      revision_count = page.wiki_revisions.count
-      version_count = page.wiki_versions.count
-
-      put "/wiki/#{ page.id }",
-          params: {
-            title: 'wiki_history_conflict_renamed',
-            body: 'third',
-            message: 'stale edit',
-            base_revision_id: stale_id,
-          },
-          headers: auth_headers(user)
-
-      expect(response).to have_http_status(:conflict)
-
-      page.reload
-      expect(page.title).to eq(current_title)
-      expect(page.body).to eq(current_body)
-      expect(page.wiki_revisions.count).to eq(revision_count)
-      expect(page.wiki_versions.count).to eq(version_count)
-    end
-  end
-end

backend/spec/requests/wiki_restore_pending_spec.rb

@@ -1,37 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki restore', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  it 'restores wiki page to previous version' do
-    pending 'Wiki 版巻き戻し API 実装時に有効化する'
-
-    page =
-        Wiki::Commit.create_content!(
-            tag_name: TagName.create!(name: 'wiki_restore_page'),
-            body: 'v1',
-            created_by_user: user,
-            message: 'init')
-
-    v1 = page.wiki_versions.order(:version_no).last
-
-    Wiki::Commit.content!(
-        page:,
-        body: 'v2',
-        created_user: user,
-        message: 'edit',
-        base_revision_id: page.current_revision.id)
-
-    post "/wiki/#{ page.id }/restore",
-         params: { version_no: v1.version_no },
-         headers: auth_headers(user)
-
-    expect(response).to have_http_status(:ok)
-    expect(page.reload.body).to eq('v1')
-    expect(page.wiki_versions.order(:version_no).last.event_type).to eq('restore')
-  end
-end

backend/spec/requests/wiki_spec.rb

@@ -4,19 +4,13 @@ require 'securerandom'
 
 
 RSpec.describe 'Wiki API', type: :request do
-  def auth_headers(user)
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
   let!(:user) { create_member_user! }
 
   let!(:tn) { TagName.create!(name: 'spec_wiki_title') }
   let!(:page) do
-    Wiki::Commit.create_content!(
+    WikiPage.create!(tag_name: tn, created_user: user, updated_user: user).tap do |p|
-        tag_name: tn,
+      Wiki::Commit.content!(page: p, body: 'init', created_user: user, message: 'init')
-        body: 'init',
+    end
-        created_by_user: user,
-        message: 'init')
   end
 
   describe 'GET /wiki' do
@@ -43,7 +37,6 @@ RSpec.describe 'Wiki API', type: :request do
     context 'when wiki page exists' do
       it 'returns wiki page with title' do
         request
-
         expect(response).to have_http_status(:ok)
 
         expect(json).to include(
@@ -57,7 +50,6 @@ RSpec.describe 'Wiki API', type: :request do
 
       it 'returns 404' do
         request
-
         expect(response).to have_http_status(:not_found)
       end
     end
@@ -107,34 +99,25 @@ RSpec.describe 'Wiki API', type: :request do
         end
             .to change(WikiPage, :count).by(1)
             .and change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
 
         expect(response).to have_http_status(:created)
 
         page_id = json.fetch('id')
         expect(json.fetch('title')).to eq('TestPage')
 
-        created_page = WikiPage.find(page_id)
+        page = WikiPage.find(page_id)
-        version = created_page.wiki_versions.order(:version_no).last
+        rev = page.current_revision
-
-        expect(version).to have_attributes(
-          version_no: 1,
-          event_type: 'create',
-          title: 'TestPage',
-          body: "a\nb\nc",
-          created_by_user_id: member.id
-        )
-
-        rev = created_page.current_revision
         expect(rev).to be_present
         expect(rev).to be_content
         expect(rev.message).to eq('init')
 
-        expect(created_page.body).to eq("a\nb\nc")
+        # body が復元できること
+        expect(page.body).to eq("a\nb\nc")
 
+        # 行数とリレーションの整合
         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'])
+        expect(rev.wiki_lines.pluck(:body)).to match_array(%w[a b c])
       end
 
       it 'reuses existing WikiLine rows by sha256' do
@@ -152,41 +135,6 @@ RSpec.describe 'Wiki API', type: :request do
         # "a" の WikiLine が増殖しない（1行のはず）
         expect(WikiLine.where(body: 'a').count).to eq(1)
       end
-
-      it 'deduplicates duplicated new lines before upsert' do
-        duplicated = 'duplicated_line_for_wiki_line_upsert_spec'
-
-        post endpoint,
-             params: { title: 'DuplicateNewLine', body: "#{ duplicated }\n#{ duplicated }" },
-             headers: auth_headers(member)
-
-        expect(response).to have_http_status(:created)
-
-        page = WikiPage.find(json.fetch('id'))
-        rev = page.current_revision
-
-        expect(rev.lines_count).to eq(2)
-        expect(WikiLine.where(body: duplicated).count).to eq(1)
-        expect(rev.wiki_revision_lines.count).to eq(2)
-        expect(rev.wiki_revision_lines.pluck(:wiki_line_id).uniq.size).to eq(1)
-      end
-
-      it 'normalises CRLF and strips trailing newlines' do
-        post endpoint,
-             params: { title: 'NormalisedBody', body: "a\r\nb\r\n\r\n", message: 'normalise' },
-             headers: auth_headers(member)
-
-        expect(response).to have_http_status(:created)
-
-        page = WikiPage.find(json.fetch('id'))
-        rev = page.current_revision
-        version = page.wiki_versions.order(:version_no).last
-
-        expect(page.body).to eq("a\nb")
-        expect(version.body).to eq("a\nb")
-        expect(rev.lines_count).to eq(2)
-        expect(rev.wiki_lines.order('wiki_revision_lines.position').map(&:body)).to eq(['a', 'b'])
-      end
     end
   end
 
@@ -198,14 +146,17 @@ RSpec.describe 'Wiki API', type: :request do
       { 'X-Transfer-Code' => user.inheritance_code }
     end
 
-    let!(:test_tag_name) { TagName.create!(name: 'TestPage') }
+    #let!(:page) { create(:wiki_page, title: 'TestPage') }
-
     let!(:page) do
-      Wiki::Commit.create_content!(
+      build(:wiki_page, title: 'TestPage').tap do |p|
-          tag_name: test_tag_name,
+        puts p.errors.full_messages unless p.valid?
-          body: "a\nb",
+        p.save!
-          created_by_user: member,
+      end
-          message: 'init')
+    end
+
+    before do
+      # 初期版を 1 つ作っておく（更新が“2版目”になるように）
+      Wiki::Commit.content!(page: page, body: "a\nb", created_user: member, message: 'init')
     end
 
     context 'when not logged in' do
@@ -231,6 +182,14 @@ RSpec.describe 'Wiki API', type: :request do
             headers: auth_headers(member)
         expect(response).to have_http_status(:unprocessable_entity)
       end
+
+      it 'returns 422 when title mismatched (if you forbid rename here)' do
+        put "/wiki/#{page.id}",
+            params: { title: 'OtherTitle', body: 'x' },
+            headers: auth_headers(member)
+        # 君の controller 例だと title 変更は 422 にしてた
+        expect(response).to have_http_status(:unprocessable_entity)
+      end
     end
 
     context 'when success' do
@@ -241,18 +200,7 @@ RSpec.describe 'Wiki API', type: :request do
           put "/wiki/#{page.id}",
               params: { title: 'TestPage', body: "x\ny", message: 'edit', base_revision_id: current_id },
               headers: auth_headers(member)
-        end
+        end.to change(WikiRevision, :count).by(1)
-            .to change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-
-        version = page.wiki_versions.order(:version_no).last
-
-        expect(version).to have_attributes(
-          event_type: 'update',
-          title: 'TestPage',
-          body: "x\ny",
-          created_by_user_id: member.id
-        )
 
         expect(response).to have_http_status(:ok)
 
@@ -263,60 +211,25 @@ RSpec.describe 'Wiki API', type: :request do
         expect(page.body).to eq("x\ny")
         expect(rev.base_revision_id).to eq(current_id)
       end
-
-      it 'wiki body だけを変更しても tag version は作成しない' do
-        linked_tag_name = TagName.create!(name: 'wiki_body_only_tag')
-        linked_tag = Tag.create!(tag_name: linked_tag_name, category: :general)
-
-        TagVersionRecorder.record!(
-            tag: linked_tag,
-            event_type: :create,
-            created_by_user: member)
-
-        linked_page =
-            Wiki::Commit.create_content!(
-                tag_name: linked_tag_name,
-                body: 'before',
-                created_by_user: member,
-                message: 'init')
-
-        current_id = linked_page.current_revision.id
-        before_count = linked_tag.reload.tag_versions.count
-
-        expect {
-          put "/wiki/#{ linked_page.id }",
-              params: {
-                title: 'wiki_body_only_tag',
-                body: 'after',
-                message: 'edit',
-                base_revision_id: current_id,
-              },
-              headers: auth_headers(member)
-        }
-            .to change(WikiRevision, :count).by(1)
-            .and change(WikiVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(linked_tag.reload.tag_versions.count).to eq(before_count)
-      end
     end
 
-    context 'when conflict' do
+    # TODO: コンフリクト未実装のため，実装したらコメント外す．
-      it 'returns 409 when base_revision_id mismatches' do
+    # context 'when conflict' do
-        # 先に別ユーザ（同じ member でもOK）が 1 回更新して先頭を進める
+    #   it 'returns 409 when base_revision_id mismatches' do
-        Wiki::Commit.content!(page: page, body: "zzz", created_user: member, message: 'other edit')
+    #     # 先に別ユーザ（同じ member でもOK）が 1 回更新して先頭を進める
-        page.reload
+    #     Wiki::Commit.content!(page: page, body: "zzz", created_user: member, message: 'other edit')
+    #     page.reload
 
-        stale_id = page.wiki_revisions.order(:id).first.id # わざと古い id
+    #     stale_id = page.wiki_revisions.order(:id).first.id # わざと古い id
-        put "/wiki/#{page.id}",
+    #     put "/wiki/#{page.id}",
-            params: { title: 'TestPage', body: 'x', base_revision_id: stale_id },
+    #         params: { title: 'TestPage', body: 'x', base_revision_id: stale_id },
-            headers: auth_headers(member)
+    #         headers: auth_headers(member)
 
-        expect(response).to have_http_status(:conflict)
+    #     expect(response).to have_http_status(:conflict)
-        json = JSON.parse(response.body)
+    #     json = JSON.parse(response.body)
-        expect(json['error']).to eq('conflict')
+    #     expect(json['error']).to eq('conflict')
-      end
+    #   end
-    end
+    # end
 
     context 'when page not found' do
       it 'returns 404' do
@@ -348,17 +261,14 @@ RSpec.describe 'Wiki API', type: :request do
 
   describe 'GET /wiki/search' do
     before do
-      Wiki::Commit.create_content!(
+      # 追加で検索ヒット用
-          tag_name: TagName.create!(name: 'spec_wiki_title_2'),
+      TagName.create!(name: 'spec_wiki_title_2')
-          body: 'search body 2',
+      WikiPage.create!(tag_name: TagName.find_by!(name: 'spec_wiki_title_2'),
-          created_by_user: user,
+                       created_user: user, updated_user: user)
-          message: 'init')
 
-      Wiki::Commit.create_content!(
+      TagName.create!(name: 'unrelated_title')
-          tag_name: TagName.create!(name: 'unrelated_title'),
+      WikiPage.create!(tag_name: TagName.find_by!(name: 'unrelated_title'),
-          body: 'unrelated body',
+                       created_user: user, updated_user: user)
-          created_by_user: user,
-          message: 'init')
     end
 
     it 'returns up to 20 pages filtered by title like' do
@@ -368,9 +278,7 @@ RSpec.describe 'Wiki API', type: :request do
       expect(json).to be_an(Array)
 
       titles = json.map { |p| p['title'] }
-
+      expect(titles).to include('spec_wiki_title', 'spec_wiki_title_2')
-      expect(titles).to include('spec_wiki_title')
-      expect(titles).to include('spec_wiki_title_2')
       expect(titles).not_to include('unrelated_title')
     end
 
@@ -421,12 +329,7 @@ RSpec.describe 'Wiki API', type: :request do
     it 'returns empty array when page has no revisions and filtered by id' do
       # 別ページを作って revision 無し
       tn2 = TagName.create!(name: 'spec_no_rev')
-      # 異常データ: revision 無し WikiPage を直接作る
+      p2 = WikiPage.create!(tag_name: tn2, created_user: user, updated_user: user)
-      p2 = WikiPage.create!(
-          tag_name: tn2,
-          body: 'init',
-          created_user: user,
-          updated_user: user)
 
       get "/wiki/changes?id=#{p2.id}"
       expect(response).to have_http_status(:ok)
@@ -495,68 +398,29 @@ RSpec.describe 'Wiki API', type: :request do
       expect(json['older_revision_id']).to eq(rev_a.id)
       expect(json['newer_revision_id']).to eq(page.current_revision.id)
     end
+
+    it 'returns 422 when "to" is redirect revision' do
+      # redirect revision を作る
+      tn2 = TagName.create!(name: 'redirect_target')
+      target = WikiPage.create!(tag_name: tn2, created_user: user, updated_user: user)
+
+      Wiki::Commit.redirect!(page: page, redirect_page: target, created_user: user, message: 'redir')
+      redirect_rev = page.current_revision
+      expect(redirect_rev).to be_redirect
+
+      get "/wiki/#{page.id}/diff?from=#{rev_a.id}&to=#{redirect_rev.id}"
+      expect(response).to have_http_status(:unprocessable_entity)
     end
 
-  describe 'Wiki::Commit.redirect!' do
+    it 'returns 422 when "from" is redirect revision' do
-    it 'raises because redirect revisions are deprecated' do
+      tn2 = TagName.create!(name: 'redirect_target2')
-      target_tag_name = TagName.create!(name: 'redirect_deprecated_target')
+      target = WikiPage.create!(tag_name: tn2, created_user: user, updated_user: user)
-      target =
-          Wiki::Commit.create_content!(
-              tag_name: target_tag_name,
-              body: 'target',
-              created_by_user: user,
-              message: 'init')
 
-      expect {
+      Wiki::Commit.redirect!(page: page, redirect_page: target, created_user: user, message: 'redir2')
-        Wiki::Commit.redirect!(
+      redirect_rev = page.current_revision
-          page: page,
+
-          redirect_page: target,
+      get "/wiki/#{page.id}/diff?from=#{redirect_rev.id}&to=#{rev_b.id}"
-          created_user: user,
+      expect(response).to have_http_status(:unprocessable_entity)
-          message: 'redirect',
-          base_revision_id: page.current_revision.id
-        )
-      }.to raise_error(RuntimeError, '廃止しました．')
     end
   end
-
-  it 'wiki title を変更すると対応する tag の version を作成する' do
-    linked_tag_name = TagName.create!(name: 'wiki_linked_tag_for_version')
-    linked_tag = Tag.create!(tag_name: linked_tag_name, category: :general)
-
-    linked_page =
-        Wiki::Commit.create_content!(
-            tag_name: linked_tag_name,
-            body: 'before',
-            created_by_user: user,
-            message: 'init')
-
-    current_id = linked_page.current_revision.id
-
-    expect {
-      put "/wiki/#{ linked_page.id }",
-          params: {
-            title: 'wiki_linked_tag_for_version_renamed',
-            body: 'after',
-            message: 'rename',
-            base_revision_id: current_id,
-          },
-          headers: auth_headers(user)
-    }
-        .to change(WikiRevision, :count).by(1)
-        .and change(WikiVersion, :count).by(1)
-        .and change { linked_tag.reload.tag_versions.count }.by(2)
-
-    expect(response).to have_http_status(:ok)
-
-    linked_tag.reload
-    expect(linked_tag.name).to eq('wiki_linked_tag_for_version_renamed')
-
-    versions = linked_tag.tag_versions.order(:version_no)
-
-    expect(versions.first.event_type).to eq('create')
-    expect(versions.first.name).to eq('wiki_linked_tag_for_version')
-
-    expect(versions.second.event_type).to eq('update')
-    expect(versions.second.name).to eq('wiki_linked_tag_for_version_renamed')
-  end
 end

backend/spec/requests/wiki_title_collision_spec.rb

@@ -1,62 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Wiki title collision', type: :request do
-  let!(:user) { create_member_user! }
-
-  def auth_headers user
-    { 'X-Transfer-Code' => user.inheritance_code }
-  end
-
-  def create_wiki_page title:, body:
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  it 'returns 422 when renaming wiki title to existing title' do
-    source = create_wiki_page(title: 'wiki_collision_source', body: 'source body')
-    create_wiki_page(title: 'wiki_collision_target', body: 'target body')
-
-    source_revision_count = source.wiki_revisions.count
-    source_version_count = source.wiki_versions.count
-    old_title = source.title
-    old_body = source.body
-
-    put "/wiki/#{ source.id }",
-        params: {
-          title: 'wiki_collision_target',
-          body: 'new body',
-          message: 'rename collision',
-          base_revision_id: source.current_revision.id,
-        },
-        headers: auth_headers(user)
-
-    expect(response).to have_http_status(:unprocessable_entity)
-
-    source.reload
-
-    expect(source.title).to eq(old_title)
-    expect(source.body).to eq(old_body)
-    expect(source.wiki_revisions.count).to eq(source_revision_count)
-    expect(source.wiki_versions.count).to eq(source_version_count)
-  end
-
-  it 'returns 422 when creating wiki with existing title' do
-    create_wiki_page(title: 'wiki_collision_create', body: 'already exists')
-
-    expect {
-      post '/wiki',
-           params: {
-             title: 'wiki_collision_create',
-             body: 'new body',
-             message: 'duplicate create',
-           },
-           headers: auth_headers(user)
-    }
-        .not_to change(WikiPage, :count)
-
-    expect(response).to have_http_status(:unprocessable_entity)
-  end
-end

backend/spec/services/wiki/commit_integrity_spec.rb

@@ -1,173 +0,0 @@
-require 'digest'
-require 'rails_helper'
-
-RSpec.describe Wiki::Commit do
-  let(:user) { create_member_user! }
-
-  def create_page title:, body: 'initial body'
-    described_class.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  describe '.create_content!' do
-    it 'creates page, revision, and version with normalised body' do
-      expect {
-        described_class.create_content!(
-            tag_name: TagName.create!(name: 'commit_integrity_create'),
-            body: "a\r\nb\r\n\r\n",
-            created_by_user: user,
-            message: 'init')
-      }
-          .to change(WikiPage, :count).by(1)
-          .and change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      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 = TagName.create!(name: 'commit_integrity_blank')
-
-      expect {
-        described_class.create_content!(
-            tag_name:,
-            body: "\r\n\r\n",
-            created_by_user: user,
-            message: 'blank')
-      }
-          .to raise_error(ActiveRecord::RecordInvalid)
-
-      expect(WikiPage.where(tag_name:)).not_to exist
-    end
-  end
-
-  describe '.content!' do
-    it 'updates page body, revision, and version' do
-      page = create_page(title: 'commit_integrity_update', body: 'before')
-      current_id = page.current_revision.id
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'after',
-            created_user: user,
-            message: 'edit',
-            base_revision_id: current_id)
-      }
-          .to change(WikiRevision, :count).by(1)
-          .and change(WikiVersion, :count).by(1)
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.body).to eq('after')
-      expect(version.body).to eq('after')
-      expect(version.reason).to eq('edit')
-    end
-
-    it 'does not record tag_version on body-only wiki update' do
-      tag_name = TagName.create!(name: 'commit_integrity_linked_tag')
-      tag = Tag.create!(tag_name:, category: :general)
-
-      page =
-          described_class.create_content!(
-              tag_name:,
-              body: 'before',
-              created_by_user: user,
-              message: 'init')
-
-      TagVersionRecorder.record!(
-          tag:,
-          event_type: :create,
-          created_by_user: user)
-
-      before_count = tag.reload.tag_versions.count
-
-      described_class.content!(
-          page:,
-          body: 'after',
-          created_user: user,
-          message: 'edit',
-          base_revision_id: page.current_revision.id)
-
-      expect(tag.reload.tag_versions.count).to eq(before_count)
-    end
-
-    it 'raises conflict and leaves page, revision, and version unchanged' do
-      page = create_page(title: 'commit_integrity_conflict', body: 'first')
-      stale_id = page.current_revision.id
-
-      described_class.content!(
-          page:,
-          body: 'second',
-          created_user: user,
-          message: 'second',
-          base_revision_id: stale_id)
-
-      page.reload
-      before_body = page.body
-      before_revision_count = page.wiki_revisions.count
-      before_version_count = page.wiki_versions.count
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'third',
-            created_user: user,
-            message: 'stale',
-            base_revision_id: stale_id)
-      }
-          .to raise_error(Wiki::Commit::Conflict)
-
-      page.reload
-      expect(page.body).to eq(before_body)
-      expect(page.wiki_revisions.count).to eq(before_revision_count)
-      expect(page.wiki_versions.count).to eq(before_version_count)
-    end
-
-    it 'deduplicates duplicated missing wiki lines' do
-      page = create_page(title: 'commit_integrity_dedup', body: 'before')
-      duplicated = 'commit_integrity_duplicate_line'
-
-      described_class.content!(
-          page:,
-          body: "#{ duplicated }\n#{ duplicated }",
-          created_user: user,
-          message: 'dedup',
-          base_revision_id: page.current_revision.id)
-
-      revision = page.reload.current_revision
-
-      expect(WikiLine.where(body: duplicated).count).to eq(1)
-      expect(revision.wiki_revision_lines.count).to eq(2)
-      expect(revision.wiki_revision_lines.pluck(:wiki_line_id).uniq.size).to eq(1)
-    end
-  end
-
-  describe '.redirect!' do
-    it 'raises because redirect revisions are deprecated' do
-      page = create_page(title: 'commit_integrity_redirect_source', body: 'source')
-      target = create_page(title: 'commit_integrity_redirect_target', body: 'target')
-
-      expect {
-        described_class.redirect!(
-            page:,
-            redirect_page: target,
-            created_user: user,
-            message: 'redirect',
-            base_revision_id: page.current_revision.id)
-      }
-          .to raise_error(RuntimeError, '廃止しました．')
-    end
-  end
-end

backend/spec/services/wiki/commit_spec.rb

@@ -1,150 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Wiki::Commit do
-  let(:user) { create_member_user! }
-
-  def create_page(title: 'commit_spec_page', body: 'initial body')
-    tag_name = TagName.create!(name: title)
-
-    Wiki::Commit.create_content!(
-        tag_name:,
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  describe '.content!' do
-    it 'stores normalised body in wiki_pages and wiki_versions' do
-      page = create_page(title: 'commit_normalised_page')
-
-      described_class.content!(
-        page:,
-        body: "a\r\nb\r\n\r\n",
-        created_user: user,
-        message: 'init'
-      )
-
-      page.reload
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(page.body).to eq("a\nb")
-      expect(version.body).to eq("a\nb")
-      expect(page.current_revision.lines_count).to eq(2)
-    end
-
-    it 'deduplicates duplicated missing wiki lines before upsert' do
-      page = create_page(title: 'commit_duplicate_line_page')
-      duplicated = 'commit_duplicate_line'
-
-      described_class.content!(
-        page:,
-        body: "#{ duplicated }\n#{ duplicated }",
-        created_user: user,
-        message: 'init'
-      )
-
-      page.reload
-
-      expect(WikiLine.where(body: duplicated).count).to eq(1)
-      expect(page.current_revision.lines_count).to eq(2)
-      expect(page.current_revision.wiki_revision_lines.count).to eq(2)
-    end
-
-    it 'raises conflict when base_revision_id is stale' do
-      page = create_page(title: 'commit_conflict_page')
-
-      first = described_class.content!(
-        page:,
-        body: 'first',
-        created_user: user,
-        message: 'first'
-      )
-
-      described_class.content!(
-        page:,
-        body: 'second',
-        created_user: user,
-        message: 'second',
-        base_revision_id: first.id
-      )
-
-      expect {
-        described_class.content!(
-          page:,
-          body: 'third',
-          created_user: user,
-          message: 'third',
-          base_revision_id: first.id
-        )
-      }.to raise_error(Wiki::Commit::Conflict)
-    end
-
-    it 'does not record tag version when corresponding tag has no versions' do
-      tag_name = TagName.create!(name: 'commit_linked_tag_without_versions')
-      tag = Tag.create!(tag_name:, category: :general)
-
-      page =
-          described_class.create_content!(
-              tag_name:,
-              body: 'before',
-              created_by_user: user,
-              message: 'init')
-
-      expect(tag.reload.tag_versions.count).to eq(0)
-
-      current_revision_id = page.current_revision.id
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'after',
-            created_user: user,
-            message: 'edit',
-            base_revision_id: current_revision_id)
-      }.to change(WikiVersion, :count).by(1)
-
-      expect(tag.reload.tag_versions.count).to eq(0)
-    end
-
-    it 'does not record tag version when corresponding tag has no versions' do
-      tag_name = TagName.create!(name: 'commit_linked_tag_without_versions')
-      tag = Tag.create!(tag_name:, category: :general)
-
-      page =
-          described_class.create_content!(
-              tag_name:,
-              body: 'before',
-              created_by_user: user,
-              message: 'init')
-
-      current_revision_id = page.current_revision.id
-
-      expect {
-        described_class.content!(
-            page:,
-            body: 'after',
-            created_user: user,
-            message: 'edit',
-            base_revision_id: current_revision_id)
-      }.to change(WikiVersion, :count).by(1)
-
-      expect(tag.reload.tag_versions.count).to eq(0)
-    end
-  end
-
-  describe '.redirect!' do
-    it 'raises because redirect revisions are deprecated' do
-      page = create_page(title: 'commit_redirect_source')
-      target = create_page(title: 'commit_redirect_target')
-
-      expect {
-        described_class.redirect!(
-          page:,
-          redirect_page: target,
-          created_user: user,
-          message: 'redirect'
-        )
-      }.to raise_error(RuntimeError, '廃止しました．')
-    end
-  end
-end

backend/spec/services/wiki_version_recorder_spec.rb

@@ -1,99 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe WikiVersionRecorder do
-  let(:user) { create_member_user! }
-
-  def create_page title:, body: 'body'
-    Wiki::Commit.create_content!(
-        tag_name: TagName.create!(name: title),
-        body:,
-        created_by_user: user,
-        message: 'init')
-  end
-
-  describe '.record!' do
-    it 'records title, body, reason, user, and version number' do
-      page = create_page(title: 'wiki_version_recorder_basic', body: 'body')
-
-      expect {
-        described_class.record!(
-            page:,
-            event_type: :update,
-            reason: 'manual reason',
-            created_by_user: user)
-      }
-          .to change { page.reload.wiki_versions.count }.by(1)
-
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(version).to have_attributes(
-        version_no: 2,
-        event_type: 'update',
-        title: 'wiki_version_recorder_basic',
-        body: 'body',
-        reason: 'manual reason',
-        created_by_user_id: user.id
-      )
-    end
-
-    it 'does not create duplicated update version for identical snapshot' do
-      page = create_page(title: 'wiki_version_recorder_duplicate', body: 'body')
-
-      described_class.record!(
-          page:,
-          event_type: :update,
-          reason: nil,
-          created_by_user: user)
-
-      before_count = page.reload.wiki_versions.count
-
-      described_class.record!(
-          page:,
-          event_type: :update,
-          reason: nil,
-          created_by_user: user)
-
-      expect(page.reload.wiki_versions.count).to eq(before_count)
-    end
-
-    it 'creates update version when title changes' do
-      page = create_page(title: 'wiki_version_recorder_title_before', body: 'body')
-      page.tag_name.update!(name: 'wiki_version_recorder_title_after')
-
-      expect {
-        described_class.record!(
-            page:,
-            event_type: :update,
-            reason: 'rename',
-            created_by_user: user)
-      }
-          .to change { page.reload.wiki_versions.count }.by(1)
-
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(version.title).to eq('wiki_version_recorder_title_after')
-      expect(version.body).to eq('body')
-      expect(version.reason).to eq('rename')
-    end
-
-    it 'creates update version when body changes' do
-      page = create_page(title: 'wiki_version_recorder_body', body: 'before')
-      page.update!(body: 'after')
-
-      expect {
-        described_class.record!(
-            page:,
-            event_type: :update,
-            reason: 'body',
-            created_by_user: user)
-      }
-          .to change { page.reload.wiki_versions.count }.by(1)
-
-      version = page.wiki_versions.order(:version_no).last
-
-      expect(version.title).to eq('wiki_version_recorder_body')
-      expect(version.body).to eq('after')
-      expect(version.reason).to eq('body')
-    end
-  end
-end

backend/spec/tasks/nico_export_spec.rb

@@ -1,100 +0,0 @@
-require 'rails_helper'
-require 'rake'
-require 'open3'
-
-RSpec.describe 'nico:export' do
-  let(:task) { Rake::Task['nico:export'] }
-  let(:success_status) { instance_double(Process::Status, success?: true) }
-  let(:failure_status) { instance_double(Process::Status, success?: false) }
-
-  def create_post(url)
-    Post.create!(url:)
-  end
-
-  before(:all) do
-    Rails.application.load_tasks unless Rake::Task.task_defined?('nico:export')
-  end
-
-  before do
-    task.reenable
-
-    allow(ENV).to receive(:fetch).with('MYSQL_USER').and_return('mysql-user')
-    allow(ENV).to receive(:fetch).with('MYSQL_PASS').and_return('mysql-pass')
-    allow(ENV).to receive(:fetch).with('NIZIKA_NICO_PATH').and_return('/srv/nizika-nico')
-  end
-
-  describe 'export' do
-    it 'exports nicovideo ids to shared nico DB' do
-      create_post('https://www.nicovideo.jp/watch/sm12345?ref=foo')
-      create_post('https://www.nicovideo.jp/watch/so67890#comments')
-      create_post('https://www.nicovideo.jp/watch/nm24680')
-      create_post('https://example.com/watch/sm99999')
-
-      expect(Open3).to receive(:capture3) do |env, *args, **kwargs|
-        expect(env).to eq(
-          {
-            'MYSQL_USER' => 'mysql-user',
-            'MYSQL_PASS' => 'mysql-pass',
-          },
-        )
-
-        expect(args.take(3)).to eq(
-          [
-            'python3',
-            '-m',
-            'tracked_videos.put_bulk_upsert',
-          ],
-        )
-
-        expect(args.drop(3)).to contain_exactly(
-          'sm12345',
-          'so67890',
-          'nm24680',
-        )
-
-        expect(kwargs).to eq(chdir: '/srv/nizika-nico')
-
-        ['', '', success_status]
-      end
-
-      task.invoke
-    end
-
-    it 'deduplicates video ids' do
-      create_post('https://www.nicovideo.jp/watch/sm12345')
-      create_post('https://www.nicovideo.jp/watch/sm12345?from=1')
-
-      expect(Open3).to receive(:capture3) do |_env, *args, **_kwargs|
-        expect(args.drop(3)).to eq(['sm12345'])
-
-        ['', '', success_status]
-      end
-
-      task.invoke
-    end
-
-    it 'does not call python when there are no nicovideo posts' do
-      create_post('https://example.com/watch/sm12345')
-
-      expect(Open3).not_to receive(:capture3)
-
-      task.invoke
-    end
-
-    it 'raises stderr when python command fails' do
-      create_post('https://www.nicovideo.jp/watch/sm12345')
-
-      allow(Open3).to receive(:capture3).and_return(
-        [
-          '',
-          'bulk upsert failed',
-          failure_status,
-        ],
-      )
-
-      expect {
-        task.invoke
-      }.to raise_error(RuntimeError, 'bulk upsert failed')
-    end
-  end
-end

backend/spec/tasks/nico_sync_spec.rb

@@ -8,8 +8,8 @@ RSpec.describe "nico:sync" do
   end
 
   def create_tag!(name, category:)
-    tn = TagName.find_undiscard_or_create_by!(name: name.to_s.strip)
+    tn = TagName.find_or_create_by!(name: name.to_s.strip)
-    Tag.find_undiscard_or_create_by!(tag_name_id: tn.id) { |t| t.category = category }
+    Tag.find_or_create_by!(tag_name_id: tn.id) { |t| t.category = category }
   end
 
   def link_nico_to_tag!(nico_tag, tag)
@@ -90,232 +90,4 @@ RSpec.describe "nico:sync" do
     expect(active_names).to include("nico:NEW")
     expect(active_names).not_to include("nico:OLD")
   end
-
-  def snapshot_tags(post)
-    post.snapshot_tag_names.join(' ')
-  end
-
-  def create_post_version_for!(post, version_no: 1, event_type: 'create', created_by_user: nil)
-    PostVersion.create!(
-      post: post,
-      version_no: version_no,
-      event_type: event_type,
-      title: post.title,
-      url: post.url,
-      thumbnail_base: post.thumbnail_base,
-      tags: snapshot_tags(post),
-      parent: post.parent,
-      original_created_from: post.original_created_from,
-      original_created_before: post.original_created_before,
-      created_at: Time.current,
-      created_by_user: created_by_user
-    )
-  end
-
-  it '新規 post 作成時に version 1 を作る' do
-    Tag.bot
-    Tag.tagme
-    Tag.niconico
-    Tag.video
-    Tag.no_deerjikist
-
-    stub_python([{
-      'code' => 'sm9',
-      'title' => 't',
-      'tags' => ['AAA'],
-      'uploaded_at' => '2026-01-01 12:34:56'
-    }])
-
-    allow(URI).to receive(:open).and_return(StringIO.new('<html></html>'))
-
-    expect {
-      run_rake_task('nico:sync')
-    }.to change(PostVersion, :count).by(1)
-
-    post = Post.find_by!(url: 'https://www.nicovideo.jp/watch/sm9')
-    version = post.post_versions.order(:version_no).last
-
-    expect(version.version_no).to eq(1)
-    expect(version.event_type).to eq('create')
-    expect(version.created_by_user).to be_nil
-    expect(version.tags).to eq(snapshot_tags(post.reload))
-  end
-
-  it '既存 post の内容または tags が変わったとき update version を作る' do
-    post = Post.create!(
-      title: 'old',
-      url: 'https://www.nicovideo.jp/watch/sm9',
-      uploaded_user: nil
-    )
-
-    kept_general = create_tag!('spec_kept', category: 'general')
-    PostTag.create!(post: post, tag: kept_general)
-    create_post_version_for!(post)
-
-    linked = create_tag!('spec_linked', category: 'general')
-    nico = create_tag!('nico:AAA', category: 'nico')
-    link_nico_to_tag!(nico, linked)
-
-    Tag.bot
-    Tag.tagme
-    Tag.no_deerjikist
-
-    stub_python([{
-      'code' => 'sm9',
-      'title' => 't',
-      'tags' => ['AAA'],
-      'uploaded_at' => '2026-01-01 12:34:56'
-    }])
-
-    allow(URI).to receive(:open).and_return(StringIO.new('<html></html>'))
-
-    expect {
-      run_rake_task('nico:sync')
-    }.to change(PostVersion, :count).by(1)
-
-    version = post.reload.post_versions.order(:version_no).last
-    expect(version.version_no).to eq(2)
-    expect(version.event_type).to eq('update')
-    expect(version.created_by_user).to be_nil
-    expect(version.tags).to eq(snapshot_tags(post.reload))
-  end
-
-  it '既存 post に差分が無いときは新しい version を作らない' do
-    nico = create_tag!('nico:AAA', category: 'nico')
-    no_deerjikist = create_tag!('ニジラー情報不詳', category: 'meta')
-
-    post = Post.create!(
-      title: 't',
-      url: 'https://www.nicovideo.jp/watch/sm9',
-      uploaded_user: nil,
-      original_created_from: Time.iso8601('2026-01-01T03:34:00Z'),
-      original_created_before: Time.iso8601('2026-01-01T03:35:00Z')
-    )
-
-    PostTag.create!(post: post, tag: nico)
-    PostTag.create!(post: post, tag: no_deerjikist)
-    create_post_version_for!(post)
-
-    stub_python([{
-      'code' => 'sm9',
-      'title' => 't',
-      'tags' => ['AAA'],
-      'uploaded_at' => '2026-01-01 12:34:56'
-    }])
-
-    allow(URI).to receive(:open).and_return(StringIO.new('<html></html>'))
-
-    expect {
-      run_rake_task('nico:sync')
-    }.not_to change(PostVersion, :count)
-
-    version = post.reload.post_versions.order(:version_no).last
-    expect(version.version_no).to eq(1)
-    expect(version.event_type).to eq('create')
-    expect(version.tags).to eq(snapshot_tags(post.reload))
-  end
-
-  it '新規 nico tag に nico tag version を作る' do
-    Tag.bot
-    Tag.tagme
-    Tag.niconico
-    Tag.video
-    Tag.no_deerjikist
-
-    stub_python([{
-      'code' => 'sm9',
-      'title' => 't',
-      'tags' => ['AAA'],
-      'uploaded_at' => '2026-01-01 12:34:56'
-    }])
-
-    allow(URI).to receive(:open).and_return(StringIO.new('<html></html>'))
-
-    expect {
-      run_rake_task('nico:sync')
-    }.to change(NicoTagVersion, :count).by(1)
-
-    nico_tag = Tag.joins(:tag_name).find_by!(tag_names: { name: 'nico:AAA' })
-    version = nico_tag.nico_tag_versions.order(:version_no).last
-
-    expect(version.version_no).to eq(1)
-    expect(version.event_type).to eq('create')
-    expect(version.name).to eq('nico:AAA')
-    expect(version.created_by_user).to be_nil
-  end
-
-  it '既存 post に version が無い場合は create snapshot を補う' do
-    post = Post.create!(
-      title: 'old',
-      url: 'https://www.nicovideo.jp/watch/sm9',
-      uploaded_user: nil
-    )
-
-    kept_general = create_tag!('spec_kept_without_version', category: 'general')
-    PostTag.create!(post: post, tag: kept_general)
-
-    Tag.bot
-    Tag.tagme
-    Tag.no_deerjikist
-
-    stub_python([{
-      'code' => 'sm9',
-      'title' => 'changed title',
-      'tags' => ['AAA'],
-      'uploaded_at' => '2026-01-01 12:34:56'
-    }])
-
-    allow(URI).to receive(:open).and_return(StringIO.new('<html></html>'))
-
-    expect {
-      run_rake_task('nico:sync')
-    }.to change { post.reload.post_versions.count }.by(1)
-
-    versions = post.reload.post_versions.order(:version_no)
-
-    expect(versions.map(&:event_type)).to eq(['create'])
-    expect(versions.first.title).to eq('changed title')
-    expect(versions.first.tags).to eq(snapshot_tags(post.reload))
-  end
-
-  it '既存 version がある post には update version を作る' do
-    post = Post.create!(
-      title: 'old',
-      url: 'https://www.nicovideo.jp/watch/sm9',
-      uploaded_user: nil
-    )
-
-    kept_general = create_tag!('spec_kept_with_version', category: 'general')
-    PostTag.create!(post: post, tag: kept_general)
-
-    PostVersionRecorder.record!(
-      post: post,
-      event_type: :create,
-      created_by_user: nil
-    )
-
-    Tag.bot
-    Tag.tagme
-    Tag.no_deerjikist
-
-    stub_python([{
-      'code' => 'sm9',
-      'title' => 'changed title',
-      'tags' => ['AAA'],
-      'uploaded_at' => '2026-01-01 12:34:56'
-    }])
-
-    allow(URI).to receive(:open).and_return(StringIO.new('<html></html>'))
-
-    expect {
-      run_rake_task('nico:sync')
-    }.to change { post.reload.post_versions.count }.by(1)
-
-    versions = post.reload.post_versions.order(:version_no)
-
-    expect(versions.map(&:event_type)).to eq(['create', 'update'])
-    expect(versions.first.title).to eq('old')
-    expect(versions.second.title).to eq('changed title')
-    expect(versions.second.tags).to eq(snapshot_tags(post.reload))
-  end
 end

frontend/package.json

@@ -15,8 +15,6 @@
     "@dnd-kit/modifiers": "^9.0.0",
     "@dnd-kit/utilities": "^3.2.2",
     "@fontsource-variable/noto-sans-jp": "^5.2.9",
-    "@mdx-js/react": "^3.1.1",
-    "@mdx-js/rollup": "^3.1.1",
     "@radix-ui/react-dialog": "^1.1.14",
     "@radix-ui/react-switch": "^1.2.5",
     "@radix-ui/react-toast": "^1.2.14",
@@ -39,15 +37,13 @@
     "react-youtube": "^10.1.0",
     "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.3.0",
-    "unist-util-visit-parents": "^6.0.1",
+    "zustand": "^5.0.8",
-    "zustand": "^5.0.8"
+    "unist-util-visit-parents": "^6.0.1"
   },
   "devDependencies": {
     "@eslint/js": "^9.25.0",
-    "@tailwindcss/typography": "^0.5.19",
     "@types/axios": "^0.14.4",
     "@types/markdown-it": "^14.1.2",
-    "@types/mdx": "^2.0.13",
     "@types/node": "^24.0.13",
     "@types/react": "^19.1.2",
     "@types/react-dom": "^19.1.2",

frontend/scripts/generate-sitemap.js

@@ -20,7 +20,7 @@ const fetchPosts = async tagName => (await axios.get (`${ API_BASE_URL }/posts`,
                                  match: 'all',
                                  limit: '20' }) } })).data.posts
 
-const fetchTags = async () => (await axios.get (`${ API_BASE_URL }/tags`)).data.tags
+const fetchTags = async () => (await axios.get (`${ API_BASE_URL }/tags`)).data
 const fetchTagNames = async () => (await fetchTags ()).map (tag => tag.name)
 
 const fetchWikiPages = async () => (await axios.get (`${ API_BASE_URL }/wiki`)).data

frontend/src/App.tsx

@@ -1,4 +1,4 @@
-import { AnimatePresence, LayoutGroup, motion } from 'framer-motion'
+import { AnimatePresence, LayoutGroup } from 'framer-motion'
 import { useEffect, useState } from 'react'
 import { BrowserRouter,
 	 Navigate,
@@ -10,15 +10,8 @@ import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
 import { Toaster } from '@/components/ui/toaster'
 import { apiPost, isApiError } from '@/lib/api'
-import MaterialBasePage from '@/pages/materials/MaterialBasePage'
-import MaterialDetailPage from '@/pages/materials/MaterialDetailPage'
-import MaterialListPage from '@/pages/materials/MaterialListPage'
-import MaterialNewPage from '@/pages/materials/MaterialNewPage'
-// import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
-import MorePage from '@/pages/MorePage'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
-import TOSPage from '@/pages/TOSPage.mdx'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
 import PostHistoryPage from '@/pages/posts/PostHistoryPage'
 import PostListPage from '@/pages/posts/PostListPage'
@@ -26,10 +19,6 @@ import PostNewPage from '@/pages/posts/PostNewPage'
 import PostSearchPage from '@/pages/posts/PostSearchPage'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
 import SettingPage from '@/pages/users/SettingPage'
-import TagDetailPage from '@/pages/tags/TagDetailPage'
-import TagHistoryPage from '@/pages/tags/TagHistoryPage'
-import TagListPage from '@/pages/tags/TagListPage'
-import TheatreDetailPage from '@/pages/theatres/TheatreDetailPage'
 import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
 import WikiDiffPage from '@/pages/wiki/WikiDiffPage'
 import WikiEditPage from '@/pages/wiki/WikiEditPage'
@@ -48,25 +37,16 @@ const RouteTransitionWrapper = ({ user, setUser }: {
   const location = useLocation ()
 
   return (
+      <LayoutGroup id="gallery-shared">
 	<AnimatePresence mode="wait">
-	<Routes location={location}>
+	  <Routes location={location} key={location.pathname}>
 	    <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/nico" element={<NicoTagListPage user={user}/>}/>
-	  <Route path="/tags/changes" element={<TagHistoryPage/>}/>
-	  <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
-	  <Route path="/materials" element={<MaterialBasePage/>}>
-	    <Route index element={<MaterialListPage/>}/>
-	    <Route path="new" element={<MaterialNewPage/>}/>
-	    <Route path=":id" element ={<MaterialDetailPage/>}/>
-	  </Route>
-	  {/* <Route path="/materials/search" element={<MaterialSearchPage/>}/> */}
 	    <Route path="/wiki" element={<WikiSearchPage/>}/>
 	    <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
 	    <Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>
@@ -75,11 +55,10 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <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="/more" element={<MorePage/>}/>
 	    <Route path="*" element={<NotFound/>}/>
 	  </Routes>
-      </AnimatePresence>)
+	</AnimatePresence>
+      </LayoutGroup>)
 }
 
 
@@ -137,15 +116,10 @@ export default (() => {
       <>
 	<RouteBlockerOverlay/>
 	<BrowserRouter>
-	  <LayoutGroup>
+	  <div className="flex flex-col h-screen w-screen">
-	    <motion.div
-		layout="position"
-		transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-		className="flex flex-col h-dvh w-full overflow-y-hidden">
 	    <TopNav user={user}/>
 	    <RouteTransitionWrapper user={user} setUser={setUser}/>
-	    </motion.div>
+	  </div>
-	  </LayoutGroup>
 	  <Toaster/>
 	</BrowserRouter>
       </>)

frontend/src/components/DraggableDroppableTagRow.tsx

@@ -1,6 +1,5 @@
 import { useDraggable, useDroppable } from '@dnd-kit/core'
 import { CSS } from '@dnd-kit/utilities'
-import { motion } from 'framer-motion'
 import { useRef } from 'react'
 
 import TagLink from '@/components/TagLink'
@@ -15,11 +14,10 @@ type Props = {
     nestLevel:        number
     pathKey:          string
     parentTagId?:     number
-    suppressClickRef: MutableRefObject<boolean>
+    suppressClickRef: MutableRefObject<boolean> }
-    sp?:              boolean }
 
 
-export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }: Props) => {
+export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef }: Props) => {
   const dndId = `tag-node:${ pathKey }`
 
   const downPosRef = useRef<{ x: number; y: number } | null> (null)
@@ -90,10 +88,6 @@ export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }:
 	  className={cn ('rounded select-none', over && 'ring-2 ring-offset-2')}
 	  {...attributes}
 	  {...listeners}>
-	<motion.div
-	    transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-	    layoutId={`tag-${ sp ? 'sp-' : '' }${ tag.id }`}>
 	<TagLink tag={tag} nestLevel={nestLevel}/>
-	</motion.div>
       </div>)
 }) satisfies FC<Props>

frontend/src/components/MaterialSidebar.tsx

@@ -1,97 +0,0 @@
-import { Fragment, useEffect, useState } from 'react'
-
-import TagLink from '@/components/TagLink'
-import SidebarComponent from '@/components/layout/SidebarComponent'
-import { apiGet } from '@/lib/api'
-
-import type { FC, ReactNode } from 'react'
-
-import type { Tag } from '@/types'
-
-type TagWithDepth = Tag & {
-    hasChildren:  boolean
-    children:     TagWithDepth[] }
-
-
-const setChildrenById = (
-    tags:     TagWithDepth[],
-    targetId: number,
-    children: TagWithDepth[],
-): TagWithDepth[] => (
-    tags.map (tag => {
-      if (tag.id === targetId)
-	return { ...tag, children }
-
-      if (tag.children.length === 0)
-	return tag
-
-      return { ...tag,
-	       children: (setChildrenById (tag.children, targetId, children)
-			  .filter (t => t.category !== 'meme' || t.hasChildren)) }
-    }))
-
-
-export default (() => {
-  const [tags, setTags] = useState<TagWithDepth[]> ([])
-  const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
-  const [tagFetchedFlags, setTagFetchedFlags] = useState<Record<number, boolean>> ({ })
-
-  useEffect (() => {
-    void (async () => {
-      setTags ((await apiGet<TagWithDepth[]> ('/tags/with-depth'))
-	       .filter (t => t.category !== 'meme' || t.hasChildren))
-    }) ()
-  }, [])
-
-  const renderTags = (ts: TagWithDepth[], nestLevel = 0): ReactNode => (
-      ts.map (t => (
-	  <Fragment key={t.id}>
-	    <li>
-	      <div className="flex">
-		<div className="flex-none w-4">
-		  {t.hasChildren && (
-		      <a
-			  href="#"
-			  onClick={async e => {
-			    e.preventDefault ()
-			    if (!(tagFetchedFlags[t.id]))
-			      {
-				try
-				{
-				  const data =
-				      await apiGet<TagWithDepth[]> (
-					  '/tags/with-depth', { params: { parent: String (t.id) } })
-				  setTags (prev => setChildrenById (prev, t.id, data))
-				  setTagFetchedFlags (prev => ({ ...prev, [t.id]: true }))
-				}
-				catch
-				{
-				  ;
-				}
-			      }
-			    setOpenTags (prev => ({ ...prev, [t.id]: !(prev[t.id]) }))
-			  }}>
-			{openTags[t.id] ? <>&minus;</> : '+'}
-		      </a>)}
-		</div>
-		<div className="flex-1 truncate">
-		  <TagLink
-		      tag={t}
-		      nestLevel={nestLevel}
-		      title={t.name}
-		      withCount={false}
-		      withWiki={false}
-		      to={`/materials?tag=${ encodeURIComponent (t.name) }`}/>
-		</div>
-	      </div>
-	    </li>
-	    {openTags[t.id] && renderTags (t.children, nestLevel + 1)}
-	  </Fragment>)))
-
-  return (
-      <SidebarComponent>
-	<ul>
-	  {renderTags (tags)}
-	</ul>
-      </SidebarComponent>)
-}) satisfies FC

frontend/src/components/NicoViewer.tsx

@@ -1,204 +1,78 @@
-import { forwardRef,
+import { useRef, useLayoutEffect, useEffect, useState } from 'react'
-         useCallback,
+type Props = { id:      string,
-         useEffect,
+	       width:   number,
-         useImperativeHandle,
+	       height:  number,
-         useLayoutEffect,
+	       style?:  CSSProperties }
-         useMemo,
-         useRef,
-         useState } from 'react'
 
-import type { CSSProperties, ForwardedRef } from 'react'
+import type { CSSProperties, FC } from 'react'
-
-import type { NiconicoMetadata, NiconicoVideoInfo, NiconicoViewerHandle } from '@/types'
-
-type NiconicoPlayerMessage =
-    | { eventName: 'enterProgrammaticFullScreen' }
-    | { eventName: 'exitProgrammaticFullScreen' }
-    | { eventName: 'loadComplete'; playerId?: string; data: { videoInfo: NiconicoVideoInfo } }
-    | { eventName: 'playerMetadataChange'; playerId?: string; data: NiconicoMetadata }
-    | { eventName: 'playerStatusChange' | 'statusChange'; playerId?: string; data?: unknown }
-    | { eventName: 'error'; playerId?: string; data?: unknown; code?: string; message?: string }
-
-type NiconicoCommand =
-    | { eventName: 'play'; sourceConnectorType: 1; playerId: string }
-    | { eventName: 'pause'; sourceConnectorType: 1; playerId: string }
-    | { eventName: 'seek'; sourceConnectorType: 1; playerId: string; data: { time: number } }
-    | { eventName: 'mute'; sourceConnectorType: 1; playerId: string; data: { mute: boolean } }
-    | { eventName: 'volumeChange'; sourceConnectorType: 1; playerId: string;
-	data: { volume: number } }
-    | { eventName: 'commentVisibilityChange'; sourceConnectorType: 1; playerId: string;
-	data: { commentVisibility: boolean } }
-
-const EMBED_ORIGIN = 'https://embed.nicovideo.jp'
-
-type Props = {
-    id:                 string
-    width:              number
-    height:             number
-    style?:             CSSProperties
-    onLoadComplete?:    (info: NiconicoVideoInfo) => void
-    onMetadataChange?:  (meta: NiconicoMetadata) => void }
 
 
-export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle>) => {
+export default ((props: Props) => {
-  const { id, width, height, style = { }, onLoadComplete, onMetadataChange } = props
+  const { id, width, height, style = { } } = props
 
   const iframeRef = useRef<HTMLIFrameElement> (null)
-  const playerId = useMemo (() => `nico-${ id }-${ Math.random ().toString (36).slice (2) }`, [id])
 
   const [screenWidth, setScreenWidth] = useState<CSSProperties['width']> ()
   const [screenHeight, setScreenHeight] = useState<CSSProperties['height']> ()
   const [landscape, setLandscape] = useState<boolean> (false)
   const [fullScreen, setFullScreen] = useState<boolean> (false)
 
-  const src =
+  const src = `https://embed.nicovideo.jp/watch/${id}?persistence=1&oldScript=1&referer=&from=0&allowProgrammaticFullScreen=1`;
-      `${ EMBED_ORIGIN }/watch/${ id }`
-      + '?jsapi=1'
-      + `&playerId=${ encodeURIComponent (playerId) }`
-      + '&persistence=1'
-      + '&oldScript=1'
-      + '&referer='
-      + '&from=0'
-      + '&allowProgrammaticFullScreen=1'
 
-  const styleFullScreen: CSSProperties =
+  const styleFullScreen: CSSProperties = fullScreen ? {
-      fullScreen
+      top:  0,
-      ? { top: 0,
       left: landscape ? 0 : '100%',
       position: 'fixed',
       width: screenWidth,
       height: screenHeight,
-          zIndex: 2_147_483_647,
+      zIndex: 2147483647,
       maxWidth: 'none',
       transformOrigin: '0% 0%',
       transform: landscape ? 'none' : 'rotate(90deg)',
       WebkitTransformOrigin: '0% 0%',
-          WebkitTransform: landscape ? 'none' : 'rotate(90deg)' }
+      WebkitTransform: landscape ? 'none' : 'rotate(90deg)' } : {};
-      : { }
 
-  const margedStyle: CSSProperties =
+  const margedStyle = {
-      { border: 'none', maxWidth: '100%', ...style, ...styleFullScreen }
+      border:   'none',
-
+      maxWidth: '100%',
-  const postToPlayer = useCallback ((message: NiconicoCommand) => {
+      ...style,
-    const win = iframeRef.current?.contentWindow
+      ...styleFullScreen }
-    if (!(win))
-      return
-
-    win.postMessage (message, EMBED_ORIGIN)
-  }, [])
-
-  const play = useCallback (() => {
-    postToPlayer ({ eventName: 'play', sourceConnectorType: 1, playerId })
-  }, [playerId, postToPlayer])
-
-  const pause = useCallback (() => {
-    postToPlayer ({ eventName: 'pause', sourceConnectorType: 1, playerId })
-  }, [playerId, postToPlayer])
-
-  const seek = useCallback ((time: number) => {
-    postToPlayer ({ eventName: 'seek', sourceConnectorType: 1, playerId, data: { time } })
-  }, [playerId, postToPlayer])
-
-  const mute = useCallback (() => {
-    postToPlayer ({ eventName: 'mute', sourceConnectorType: 1, playerId, data: { mute: true } })
-  }, [playerId, postToPlayer])
-
-  const unmute = useCallback (() => {
-    postToPlayer ({ eventName: 'mute', sourceConnectorType: 1, playerId, data: { mute: false } })
-  }, [playerId, postToPlayer])
-
-  const setVolume = useCallback ((volume: number) => {
-    postToPlayer (
-	{ eventName: 'volumeChange', sourceConnectorType: 1, playerId, data: { volume } })
-  }, [playerId, postToPlayer])
-
-  const showComments = useCallback (() => {
-    postToPlayer (
-	{ eventName: 'commentVisibilityChange', sourceConnectorType: 1, playerId,
-	  data: { commentVisibility: true } })
-  }, [playerId, postToPlayer])
-
-  const hideComments = useCallback (() => {
-    postToPlayer (
-	{ eventName: 'commentVisibilityChange', sourceConnectorType: 1, playerId,
-	  data: { commentVisibility: false } })
-  }, [playerId, postToPlayer])
-
-  useImperativeHandle (
-      ref,
-      () => ({ play, pause, seek, mute, unmute, setVolume, showComments, hideComments }),
-      [play, pause, seek, mute, unmute, setVolume, showComments, hideComments])
 
   useEffect (() => {
-    const onMessage = (event: MessageEvent<NiconicoPlayerMessage>) => {
+    const onMessage = (event: MessageEvent<any>) => {
       if (!(iframeRef.current)
-          || (event.source !== iframeRef.current.contentWindow)
+	  || (event.source !== iframeRef.current.contentWindow))
-          || (event.origin !== EMBED_ORIGIN))
 	return
 
-      const data = event.data
+      if (event.data.eventName === 'enterProgrammaticFullScreen')
-
-      if (!(data)
-	  || typeof data !== 'object'
-	  || !('eventName' in data))
-        return
-
-      if (('playerId' in data)
-	  && data.playerId
-	  && data.playerId !== playerId)
-        return
-
-      if (data.eventName === 'enterProgrammaticFullScreen')
-	{
 	setFullScreen (true)
-	  return
+      else if (event.data.eventName === 'exitProgrammaticFullScreen')
-	}
-
-      if (data.eventName === 'exitProgrammaticFullScreen')
-	{
 	setFullScreen (false)
-	  return
-	}
-
-      if (data.eventName === 'loadComplete')
-	{
-	  onLoadComplete?.(data.data.videoInfo)
-	  return
-	}
-
-      if (data.eventName === 'playerMetadataChange')
-	{
-	  onMetadataChange?.(data.data)
-	  return
-	}
-
-      if (data.eventName === 'error')
-        console.error ('niconico player error:', data)
     }
 
     addEventListener ('message', onMessage)
 
     return () => removeEventListener ('message', onMessage)
-  }, [onLoadComplete, onMetadataChange, playerId])
+  }, [])
 
-  useLayoutEffect (() => {
+  useLayoutEffect(() => {
     if (!(fullScreen))
       return
 
     const initialScrollX = scrollX
     const initialScrollY = scrollY
-    let timer: ReturnType<typeof setTimeout>
+    let timer: NodeJS.Timeout
     let ended = false
 
     const pollingResize = () => {
       if (ended)
 	return
 
-      const isLandscape = innerWidth >= innerHeight
+      const landscape = innerWidth >= innerHeight
-      const windowWidth = `${ isLandscape ? innerWidth : innerHeight }px`
+      const windowWidth = `${landscape ? innerWidth : innerHeight}px`
-      const windowHeight = `${ isLandscape ? innerHeight : innerWidth }px`
+      const windowHeight = `${landscape ? innerHeight : innerWidth}px`
 
-      setLandscape (isLandscape)
+      setLandscape (landscape)
       setScreenWidth (windowWidth)
       setScreenHeight (windowHeight)
       timer = setTimeout (startPollingResize, 200)
@@ -223,17 +97,15 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
   useEffect (() => {
     if (!(fullScreen))
       return
-
     scrollTo (0, 0)
   }, [screenWidth, screenHeight, fullScreen])
 
   return (
-      <iframe
+      <iframe ref={iframeRef}
-	  ref={iframeRef}
 	      src={src}
 	      width={width}
 	      height={height}
 	      style={margedStyle}
 	      allowFullScreen
 	      allow="autoplay"/>)
-})
+}) satisfies FC<Props>

frontend/src/components/PostEditForm.tsx

@@ -62,7 +62,7 @@ export default (({ post, onSave }: Props) => {
 	  <Label>タイトル</Label>
 	  <input type="text"
 		 className="w-full border rounded p-2"
-		 value={title ?? ''}
+		 value={title}
 		 onChange={ev => setTitle (ev.target.value)}/>
 	</div>
 

frontend/src/components/PostEmbed.tsx

@@ -4,18 +4,14 @@ import YoutubeEmbed from 'react-youtube'
 import NicoViewer from '@/components/NicoViewer'
 import TwitterEmbed from '@/components/TwitterEmbed'
 
-import type { FC, RefObject } from 'react'
+import type { FC } from 'react'
 
-import type { NiconicoMetadata, NiconicoVideoInfo, NiconicoViewerHandle, Post } from '@/types'
+import type { Post } from '@/types'
 
-type Props = {
+type Props = { post: Post }
-    ref?:               RefObject<NiconicoViewerHandle | null>
-    post:               Post
-    onLoadComplete?:    (info: NiconicoVideoInfo) => void
-    onMetadataChange?:  (meta: NiconicoMetadata) => void }
 
 
-export default (({ ref, post, onLoadComplete, onMetadataChange }: Props) => {
+export default (({ post }: Props) => {
   const url = new URL (post.url)
 
   switch (url.hostname.split ('.').slice (-2).join ('.'))
@@ -28,14 +24,7 @@ export default (({ ref, post, onLoadComplete, onMetadataChange }: Props) => {
 
       const [videoId] = mVideoId
 
-      return (
+      return <NicoViewer id={videoId} width={640} height={360}/>
-	  <NicoViewer
-	      ref={ref}
-	      id={videoId}
-	      width={640}
-	      height={360}
-	      onLoadComplete={onLoadComplete}
-	      onMetadataChange={onMetadataChange}/>)
     }
 
   case 'twitter.com':

frontend/src/components/PostList.tsx

@@ -56,7 +56,7 @@ export default (({ posts, onClick }: Props) => {
 		      cardRef.current.style.zIndex = ''
 		      cardRef.current.style.position = ''
 		    }}
-		    transition={{ layout: { duration: .2, ease: 'easeOut' } }}>
+		    transition={{ type: 'spring', stiffness: 500, damping: 40, mass: .5 }}>
 		  <img src={post.thumbnail || post.thumbnailBase || undefined}
 		       alt={post.title || post.url}
 		       title={post.title || post.url || undefined}

frontend/src/components/PrefetchLink.tsx

@@ -71,8 +71,7 @@ export default forwardRef<HTMLAnchorElement, Props> (({
 	  || ev.metaKey
 	  || ev.ctrlKey
 	  || ev.shiftKey
-	  || ev.altKey
+	  || ev.altKey)
-	  || (rest.target && rest.target !== '_self'))
 	return
 
       ev.preventDefault ()