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)
@@ -197,64 +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
-
-      tag.update!(category:)
-      tag.tag_name.update!(name:)
-
-      alias_names << old_name if name != old_name
-      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)
-    end
-
-    render json: TagRepr.base(tag.reload)
-  end
-
   def update
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
@@ -264,78 +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:)
-
-      tag.tag_name.update!(name:) if name.present?
-      tag.update!(category:) if category.present?
-
-      record_tag_version!(tag, event_type: :update, created_by_user: current_user)
     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:
-    if tag.nico?
-      NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-    else
-      TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
-    end
-  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

@@ -90,7 +90,7 @@ class WikiPagesController < ApplicationController
 
     return head :unprocessable_entity if name.blank? || body.blank?
 
-    tag_name = TagName.find_undiscard_or_create_by!(name:)
+    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

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'

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/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/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_19_035400) 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_19_035400) 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_19_035400) 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_19_035400) 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_19_035400) 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_19_035400) 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_19_035400) 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
@@ -358,10 +192,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_19_035400) do
     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
@@ -398,28 +229,14 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_19_035400) do
 
   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"
@@ -428,22 +245,11 @@ ActiveRecord::Schema[8.0].define(version: 2026_04_19_035400) 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"

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/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
 
@@ -34,84 +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
         WikiPage.create!(
-          tag_name: source_tag_name,
+            tag_name: source_tag.tag_name,
             created_user: create_admin_user!,
-          updated_user: create_admin_user!
+            updated_user: create_admin_user!)
-        )
       end
 
       it 'rolls back the transaction' do
@@ -119,95 +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

@@ -1,218 +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
-  end
-end

backend/spec/requests/tags_spec.rb

@@ -1,6 +1,7 @@
 require 'cgi'
 require 'rails_helper'
 
+
 RSpec.describe 'Tags API', type: :request do
   let!(:tn) { TagName.create!(name: 'spec_tag') }
   let!(:tag) { Tag.create!(tag_name: tn, category: :general) }
@@ -10,215 +11,16 @@ RSpec.describe 'Tags API', type: :request do
   let!(:tn2) { TagName.create!(name: 'unknown') }
   let!(:tag2) { Tag.create!(tag_name: tn2, category: :general) }
 
-  def response_tags
-    json.fetch('tags')
-  end
-
-  def response_names
-    response_tags.map { |t| t.fetch('name') }
-  end
-
-  def dummy_material_upload(filename: 'dummy.png', type: 'image/png', body: 'dummy')
-    Rack::Test::UploadedFile.new(StringIO.new(body), type, original_filename: filename)
-  end
-
-  def create_material(tag, user:, filename: 'dummy.png', type: 'image/png', url: nil)
-    Material.new(tag:, url:, created_by_user: user, updated_by_user: user).tap do |material|
-      material.file.attach(dummy_material_upload(filename:, type:)) if filename
-      material.save!
-    end
-  end
-
   describe 'GET /tags' do
-    it 'returns tags with count and metadata' do
+    it 'returns tags with name' do
       get '/tags'
 
       expect(response).to have_http_status(:ok)
-      expect(json).to include('tags', 'count')
-      expect(response_tags).to be_an(Array)
-      expect(json['count']).to be_an(Integer)
-      expect(json['count']).to be >= response_tags.size
 
-      row = response_tags.find { |t| t['name'] == 'spec_tag' }
+      expect(json).to be_an(Array)
-      expect(row).to include(
+      expect(json).not_to be_empty
-          'id' => tag.id,
+      expect(json[0]).to have_key('name')
-          'name' => 'spec_tag',
+      expect(json.map { |t| t['name'] }).to include('spec_tag')
-          'category' => 'general',
-          'post_count' => 1,
-          'has_wiki' => false)
-      expect(row).to have_key('created_at')
-      expect(row).to have_key('updated_at')
-    end
-
-    it 'filters tags by post id' do
-      get '/tags', params: { post: post.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(1)
-      expect(response_names).to eq(['spec_tag'])
-    end
-
-    it 'filters tags by partial name' do
-      get '/tags', params: { name: 'spec' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to include('spec_tag')
-      expect(response_names).not_to include('unknown')
-    end
-
-    it 'filters tags by category' do
-      meme = Tag.create!(tag_name: TagName.create!(name: 'meme_only'), category: :meme)
-
-      get '/tags', params: { category: 'meme' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to eq(['meme_only'])
-      expect(response_tags.first['id']).to eq(meme.id)
-    end
-
-    it 'filters tags by post_count range' do
-      low = Tag.create!(tag_name: TagName.create!(name: 'pc_low'), category: :general)
-      mid = Tag.create!(tag_name: TagName.create!(name: 'pc_mid'), category: :general)
-      high = Tag.create!(tag_name: TagName.create!(name: 'pc_high'), category: :general)
-
-      low.update_columns(post_count: 1)
-      mid.update_columns(post_count: 3)
-      high.update_columns(post_count: 5)
-
-      get '/tags', params: {
-          name: 'pc_',
-          post_count_gte: 2,
-          post_count_lte: 4,
-          order: 'post_count:asc',
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to eq(['pc_mid'])
-    end
-
-    it 'filters tags by created_at range' do
-      old_tag = Tag.create!(tag_name: TagName.create!(name: 'created_old'), category: :general)
-      new_tag = Tag.create!(tag_name: TagName.create!(name: 'created_new'), category: :general)
-
-      old_time = Time.zone.local(2024, 1, 1, 0, 0, 0)
-      new_time = Time.zone.local(2024, 2, 1, 0, 0, 0)
-
-      old_tag.update_columns(created_at: old_time, updated_at: old_time)
-      new_tag.update_columns(created_at: new_time, updated_at: new_time)
-
-      get '/tags', params: {
-          name: 'created_',
-          created_from: Time.zone.local(2024, 1, 15, 0, 0, 0).iso8601,
-          order: 'created_at:asc',
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to eq(['created_new'])
-    end
-
-    it 'filters tags by updated_at range' do
-      old_tag = Tag.create!(tag_name: TagName.create!(name: 'updated_old'), category: :general)
-      new_tag = Tag.create!(tag_name: TagName.create!(name: 'updated_new'), category: :general)
-
-      old_time = Time.zone.local(2024, 3, 1, 0, 0, 0)
-      new_time = Time.zone.local(2024, 4, 1, 0, 0, 0)
-
-      old_tag.update_columns(created_at: old_time, updated_at: old_time)
-      new_tag.update_columns(created_at: new_time, updated_at: new_time)
-
-      get '/tags', params: {
-          name: 'updated_',
-          updated_to: Time.zone.local(2024, 3, 15, 0, 0, 0).iso8601,
-          order: 'updated_at:asc',
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to eq(['updated_old'])
-    end
-
-    it 'orders tags by custom category order' do
-      Tag.create!(tag_name: TagName.create!(name: 'cat_deerjikist'), category: :deerjikist)
-      Tag.create!(tag_name: TagName.create!(name: 'cat_meme'), category: :meme)
-      Tag.create!(tag_name: TagName.create!(name: 'cat_character'), category: :character)
-      Tag.create!(tag_name: TagName.create!(name: 'cat_general'), category: :general)
-      Tag.create!(tag_name: TagName.create!(name: 'cat_material'), category: :material)
-      Tag.create!(tag_name: TagName.create!(name: 'cat_meta'), category: :meta)
-      Tag.create!(tag_name: TagName.create!(name: 'nico:cat_nico'), category: :nico)
-
-      get '/tags', params: { name: 'cat_', order: 'category:asc', limit: 20 }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to eq(%w[
-          cat_deerjikist
-          cat_meme
-          cat_character
-          cat_general
-          cat_material
-          cat_meta
-          nico:cat_nico
-      ])
-    end
-
-    it 'paginates and keeps total count' do
-      %w[pag_a pag_b pag_c].each do |name|
-        Tag.create!(tag_name: TagName.create!(name:), category: :general)
-      end
-
-      get '/tags', params: { name: 'pag_', order: 'name:asc', page: 2, limit: 2 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(3)
-      expect(response_names).to eq(%w[pag_c])
-    end
-
-    it 'falls back to default ordering when order is invalid' do
-      low = Tag.create!(tag_name: TagName.create!(name: 'fallback_low'), category: :general)
-      high = Tag.create!(tag_name: TagName.create!(name: 'fallback_high'), category: :general)
-
-      low.update_columns(post_count: 1)
-      high.update_columns(post_count: 9)
-
-      get '/tags', params: { name: 'fallback_', order: 'nope:sideways' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names.first).to eq('fallback_high')
-    end
-
-    it 'normalises invalid page and limit' do
-      %w[norm_a norm_b].each do |name|
-        Tag.create!(tag_name: TagName.create!(name:), category: :general)
-      end
-
-      get '/tags', params: { name: 'norm_', order: 'name:asc', page: 0, limit: 0 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(2)
-      expect(response_tags.size).to eq(1)
-      expect(response_names).to eq(['norm_a'])
-    end
-
-    it 'returns aliases and parent tags' do
-      parent_tag = Tag.create!(
-        tag_name: TagName.create!(name: 'index_parent_tag'),
-        category: :meme
-      )
-      TagImplication.create!(tag:, parent_tag:)
-
-      get '/tags', params: { name: 'spec_tag' }
-
-      expect(response).to have_http_status(:ok)
-
-      row = response_tags.find { |t| t['name'] == 'spec_tag' }
-
-      expect(row['aliases']).to include('unko')
-      expect(row['parents'].map { |t| t['name'] }).to include('index_parent_tag')
-
-      parent = row['parents'].find { |t| t['name'] == 'index_parent_tag' }
-      expect(parent).to include(
-        'id' => parent_tag.id,
-        'name' => 'index_parent_tag',
-        'category' => 'meme'
-      )
     end
   end
 
@@ -237,33 +39,7 @@ RSpec.describe 'Tags API', type: :request do
         expect(json).to include(
             'id'        => tag.id,
             'name'      => 'spec_tag',
-            'category' => 'general',
+            'category'  => 'general')
-            'post_count' => 1,
-            'has_wiki' => false)
-        expect(json).to have_key('created_at')
-        expect(json).to have_key('updated_at')
-      end
-
-      it 'returns aliases and parent tags' do
-        parent_tag = Tag.create!(
-          tag_name: TagName.create!(name: 'show_parent_tag'),
-          category: :character
-        )
-        TagImplication.create!(tag:, parent_tag:)
-
-        request
-
-        expect(response).to have_http_status(:ok)
-
-        expect(json['aliases']).to include('unko')
-        expect(json['parents'].map { |t| t['name'] }).to include('show_parent_tag')
-
-        parent = json['parents'].find { |t| t['name'] == 'show_parent_tag' }
-        expect(parent).to include(
-          'id' => parent_tag.id,
-          'name' => 'show_parent_tag',
-          'category' => 'character'
-        )
       end
     end
 
@@ -285,7 +61,7 @@ RSpec.describe 'Tags API', type: :request do
 
       expect(json).to be_an(Array)
       expect(json.map { |t| t['name'] }).to include('spec_tag')
-      t = json.find { |x| x['name'] == 'spec_tag' }
+      t = json.find { |t| t['name'] == 'spec_tag' }
       expect(t).to have_key('matched_alias')
       expect(t['matched_alias']).to be(nil)
     end
@@ -297,9 +73,9 @@ RSpec.describe 'Tags API', type: :request do
 
       expect(json).to be_an(Array)
       expect(json.map { |t| t['name'] }).to include('spec_tag')
-      t = json.find { |x| x['name'] == 'spec_tag' }
+      t = json.find { |t| t['name'] == 'spec_tag' }
       expect(t['matched_alias']).to eq('unko')
-      expect(json.map { |x| x['name'] }).not_to include('unknown')
+      expect(json.map { |t| t['name'] }).not_to include('unknown')
     end
   end
 
@@ -309,14 +85,10 @@ RSpec.describe 'Tags API', type: :request do
 
       expect(response).to have_http_status(:ok)
 
-      expect(json).to include(
+      expect(json).to have_key('id')
-          'id' => tag.id,
+      expect(json).to have_key('name')
-          'name' => 'spec_tag',
+      expect(json['id']).to eq(tag.id)
-          'category' => 'general',
+      expect(json['name']).to eq('spec_tag')
-          'post_count' => 1,
-          'has_wiki' => false)
-      expect(json).to have_key('created_at')
-      expect(json).to have_key('updated_at')
     end
 
     it 'returns 404 when not found' do
@@ -325,6 +97,7 @@ RSpec.describe 'Tags API', type: :request do
     end
   end
 
+  # member? を持つ user を想定（Factory 側で trait 作ってもOK）
   let(:member_user) { create(:user) }
   let(:non_member_user) { create(:user) }
 
@@ -337,544 +110,88 @@ RSpec.describe 'Tags API', type: :request do
     allow(non_member_user).to receive(:gte_member?).and_return(false)
   end
 
-  describe 'PATCH /tags/:id' do
+  describe "PATCH /tags/:id" do
-    context '未ログイン' do
+    context "未ログイン" do
       before { stub_current_user(nil) }
 
-      it '401 を返す' do
+      it "401 を返す" do
-        patch "/tags/#{ tag.id }", params: { name: 'new' }
+        patch "/tags/#{tag.id}", params: { name: "new" }
         expect(response).to have_http_status(:unauthorized)
       end
     end
 
-    context 'ログインしてゐるが member でない' do
+    context "ログインしてゐるが member でない" do
       before { stub_current_user(non_member_user) }
 
-      it '403 を返す' do
+      it "403 を返す" do
-        patch "/tags/#{ tag.id }", params: { name: 'new' }
+        patch "/tags/#{tag.id}", params: { name: "new" }
         expect(response).to have_http_status(:forbidden)
       end
     end
 
-    context 'member' do
+    context "member" do
       before { stub_current_user(member_user) }
 
-      it 'name だけ更新できる' do
+      it "name だけ更新できる" do
-        patch "/tags/#{ tag.id }", params: { name: 'new' }
+        patch "/tags/#{tag.id}", params: { name: "new" }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq('new')
+        expect(tag.name).to eq("new")
-        expect(tag.category).to eq('general')
+        expect(tag.category).to eq("general")
 
-        body = JSON.parse(response.body)
+        json = JSON.parse(response.body)
-        expect(body['id']).to eq(tag.id)
+        expect(json["id"]).to eq(tag.id)
-        expect(body['name']).to eq('new')
+        expect(json["name"]).to eq("new")
-        expect(body['category']).to eq('general')
+        expect(json["category"]).to eq("general")
       end
 
-      it 'category だけ更新できる' do
+      it "category だけ更新できる" do
-        patch "/tags/#{ tag.id }", params: { category: 'meme' }
+        patch "/tags/#{tag.id}", params: { category: "meme" }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq('spec_tag')
+        expect(tag.name).to eq("spec_tag")
-        expect(tag.category).to eq('meme')
+        expect(tag.category).to eq("meme")
       end
 
-      it '空文字は presence により無視され、更新は走らない（値が変わらない）' do
+      it "空文字は presence により無視され、更新は走らない（値が変わらない）" do
-        patch "/tags/#{ tag.id }", params: { name: '', category: '   ' }
+        patch "/tags/#{tag.id}", params: { name: "", category: "   " }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq('spec_tag')
+        expect(tag.name).to eq("spec_tag")
-        expect(tag.category).to eq('general')
+        expect(tag.category).to eq("general")
       end
 
-      it '両方更新できる' do
+      it "両方更新できる" do
-        patch "/tags/#{ tag.id }", params: { name: 'n', category: 'meta' }
+        patch "/tags/#{tag.id}", params: { name: "n", category: "meta" }
 
         expect(response).to have_http_status(:ok)
 
         tag.reload
-        expect(tag.name).to eq('n')
+        expect(tag.name).to eq("n")
-        expect(tag.category).to eq('meta')
+        expect(tag.category).to eq("meta")
       end
 
-      it '存在しない id なら 404 を返す' do
+      it "存在しない id だと RecordNotFound になる（通常は 404）" do
-        patch '/tags/999999999', params: { name: 'x' }
+        # Rails 設定次第で例外がそのまま上がる/404になる
-        expect(response).to have_http_status(:not_found)
+        # APIなら rescue_from で 404 にしてることが多いので、その場合は 404 を期待。
+        patch "/tags/999999999", params: { name: "x" }
+
+        expect(response.status).to be_in([404, 500])
       end
 
-      it 'nico category への変更は 422 を返す' do
+      it "バリデーションで update! が失敗したら（通常は 422 か 500）" do
         patch "/tags/#{tag.id}", params: { name: 'new', category: 'nico' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        # rescue_from の実装次第で変はる:
-        expect(tag.reload.name).to eq('spec_tag')
+        # - RecordInvalid を 422 にしてるなら 422
-        expect(tag.category).to eq('general')
+        # - 未処理なら 500
-      end
+        expect(response.status).to be_in([422, 500])
-
-      it 'creates initial and update tag versions when name and category change' do
-        expect {
-          patch "/tags/#{tag.id}", params: { name: 'new_tag_name', category: 'meme' }
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-
-        versions = tag.reload.tag_versions.order(:version_no)
-
-        expect(versions.map(&:event_type)).to eq(['create', 'update'])
-
-        expect(versions.first.name).to eq('spec_tag')
-        expect(versions.first.category).to eq('general')
-        expect(versions.first.aliases.split).to include('unko')
-
-        expect(versions.second.name).to eq('new_tag_name')
-        expect(versions.second.category).to eq('meme')
-        expect(versions.second.created_by_user_id).to eq(member_user.id)
-      end
-
-      it 'returns 422 when changing normal tag category to nico' do
-        expect {
-          patch "/tags/#{tag.id}", params: { category: 'nico' }
-        }.not_to change(TagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.category).to eq('general')
-      end
-
-      it 'returns 422 when updating nico tag name' do
-        nico_tag_name = TagName.create!(name: 'nico:tags_spec_source')
-        nico_tag = Tag.create!(tag_name: nico_tag_name, category: :nico)
-
-        expect {
-          patch "/tags/#{ nico_tag.id }", params: { name: 'nico:tags_spec_renamed' }
-        }.not_to change(NicoTagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(nico_tag.reload.name).to eq('nico:tags_spec_source')
-        expect(nico_tag.category).to eq('nico')
-      end
-
-      it 'returns 422 when changing nico tag category to normal category' do
-        nico_tag_name = TagName.create!(name: 'nico:category_change_ng')
-        nico_tag = Tag.create!(tag_name: nico_tag_name, category: :nico)
-
-        expect {
-          patch "/tags/#{nico_tag.id}", params: { category: 'general' }
-        }.not_to change(NicoTagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(nico_tag.reload.category).to eq('nico')
-      end
-    end
-  end
-
-  describe 'GET /tags/with-depth' do
-    let!(:root_meme) do
-      Tag.create!(tag_name: TagName.create!(name: 'depth_a_root_meme'), category: :meme)
-    end
-
-    let!(:root_material) do
-      Tag.create!(tag_name: TagName.create!(name: 'depth_b_root_material'), category: :material)
-    end
-
-    let!(:hidden_general_root) do
-      Tag.create!(tag_name: TagName.create!(name: 'depth_hidden_general_root'), category: :general)
-    end
-
-    let!(:child_character) do
-      Tag.create!(tag_name: TagName.create!(name: 'depth_child_character'), category: :character)
-    end
-
-    let!(:grandchild_material) do
-      Tag.create!(tag_name: TagName.create!(name: 'depth_grandchild_material'), category: :material)
-    end
-
-    let!(:child_general) do
-      Tag.create!(tag_name: TagName.create!(name: 'depth_child_general'), category: :general)
-    end
-
-    before do
-      TagImplication.create!(parent_tag: root_meme, tag: child_character)
-      TagImplication.create!(parent_tag: child_character, tag: grandchild_material)
-      TagImplication.create!(parent_tag: root_material, tag: child_general)
-    end
-
-    it 'returns only visible root tags and visible has_children flags' do
-      get '/tags/with-depth'
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { |t| t['name'] }).to eq([
-        'depth_a_root_meme',
-        'depth_b_root_material'
-      ])
-
-      meme_row = json.find { |t| t['name'] == 'depth_a_root_meme' }
-      material_row = json.find { |t| t['name'] == 'depth_b_root_material' }
-
-      expect(meme_row['has_children']).to eq(true)
-      expect(meme_row['children']).to eq([])
-
-      expect(material_row['has_children']).to eq(false)
-      expect(material_row['children']).to eq([])
-
-      expect(json.map { |t| t['name'] }).not_to include('depth_hidden_general_root')
-    end
-
-    it 'returns children of the specified parent' do
-      get '/tags/with-depth', params: { parent: root_meme.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { |t| t['name'] }).to eq(['depth_child_character'])
-
-      row = json.first
-      expect(row['category']).to eq('character')
-      expect(row['has_children']).to eq(true)
-      expect(row['children']).to eq([])
-    end
-  end
-
-  describe 'GET /tags/name/:name/materials' do
-    let!(:material_user) { create_member_user! }
-
-    let!(:root_tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'materials_root'), category: :material)
-    end
-
-    let!(:child_a_tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'materials_child_a'), category: :material)
-    end
-
-    let!(:child_b_tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'materials_child_b'), category: :character)
-    end
-
-    let!(:grandchild_tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'materials_grandchild'), category: :material)
-    end
-
-    let!(:root_material) do
-      create_material(root_tag, user: material_user, filename: 'root.png')
-    end
-
-    let!(:child_a_material) do
-      create_material(child_a_tag, user: material_user, filename: 'child_a.png')
-    end
-
-    let!(:grandchild_material) do
-      create_material(grandchild_tag, user: material_user, filename: 'grandchild.png')
-    end
-
-    before do
-      TagImplication.create!(parent_tag: root_tag, tag: child_b_tag)
-      TagImplication.create!(parent_tag: root_tag, tag: child_a_tag)
-      TagImplication.create!(parent_tag: child_a_tag, tag: grandchild_tag)
-    end
-
-    it 'returns a tag tree with nested materials sorted by child name' do
-      get "/tags/name/#{ CGI.escape(root_tag.name) }/materials"
-
-      expect(response).to have_http_status(:ok)
-
-      expect(json).to include(
-        'id' => root_tag.id,
-        'name' => 'materials_root',
-        'category' => 'material'
-      )
-
-      expect(json['material']).to be_present
-      expect(json.dig('material', 'id')).to eq(root_material.id)
-      expect(json.dig('material', 'file')).to be_present
-      expect(json.dig('material', 'content_type')).to eq('image/png')
-
-      expect(json['children'].map { |t| t['name'] }).to eq([
-        'materials_child_a',
-        'materials_child_b'
-      ])
-
-      child_a = json['children'].find { |t| t['name'] == 'materials_child_a' }
-      child_b = json['children'].find { |t| t['name'] == 'materials_child_b' }
-
-      expect(child_a.dig('material', 'id')).to eq(child_a_material.id)
-      expect(child_a['children'].map { |t| t['name'] }).to eq(['materials_grandchild'])
-      expect(child_a.dig('children', 0, 'material', 'id')).to eq(grandchild_material.id)
-
-      expect(child_b['material']).to be_nil
-      expect(child_b['children']).to eq([])
-    end
-
-    it 'returns 404 when the tag does not exist' do
-      get '/tags/name/no_such_tag_12345/materials'
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  describe 'PUT /tags/:id' do
-    context '未ログイン' do
-      before { stub_current_user(nil) }
-
-      it '401 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unauthorized)
-      end
-    end
-
-    context 'ログインしてゐるが member でない' do
-      before { stub_current_user(non_member_user) }
-
-      it '403 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'member' do
-      before { stub_current_user(member_user) }
-
-      it '存在しない id なら 404 を返す' do
-        put '/tags/999999999', params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:not_found)
-      end
-
-      it 'name が空なら 422 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: '',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.name).to eq('spec_tag')
-      end
-
-      it 'category が空なら 422 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: '',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(tag.reload.name).to eq('spec_tag')
-        expect(tag.category).to eq('general')
-      end
-
-      it 'name, category, aliases, parent tags をまとめて更新できる' do
-        old_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_old_parent'),
-          category: :general
-        )
-        kept_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_kept_parent'),
-          category: :general
-        )
-        TagImplication.create!(tag:, parent_tag: old_parent)
-        TagImplication.create!(tag:, parent_tag: kept_parent)
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_renamed_tag',
-          category: 'meme',
-          aliases: 'put_alias_a put_alias_b put_alias_a',
-          parent_tags: 'put_kept_parent put_new_parent',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(tag.name).to eq('put_renamed_tag')
-        expect(tag.category).to eq('meme')
-
-        expect(TagName.find_by(name: 'put_alias_a').canonical).to eq(tag.tag_name)
-        expect(TagName.find_by(name: 'put_alias_b').canonical).to eq(tag.tag_name)
-
-        old_name_alias = TagName.find_by(name: 'spec_tag')
-        expect(old_name_alias).to be_present
-        expect(old_name_alias.canonical).to eq(tag.tag_name)
-
-        expect(alias_tn.reload.canonical).to be_nil
-
-        expect(tag.parents.map(&:name)).to contain_exactly(
-          'put_kept_parent',
-          'put_new_parent'
-        )
-
-        expect(TagImplication.where(tag:, parent_tag: old_parent)).not_to exist
-
-        expect(json['name']).to eq('put_renamed_tag')
-        expect(json['category']).to eq('meme')
-        expect(json['aliases']).to contain_exactly(
-          'put_alias_a',
-          'put_alias_b',
-          'spec_tag'
-        )
-        expect(json['parents'].map { |t| t['name'] }).to contain_exactly(
-          'put_kept_parent',
-          'put_new_parent'
-        )
-      end
-
-      it 'aliases に現在名を指定しても alias には残さない' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'spec_tag put_alias_self_test',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(TagName.find_by(name: 'put_alias_self_test').canonical).to eq(tag.tag_name)
-        expect(json['aliases']).to include('put_alias_self_test')
-        expect(json['aliases']).not_to include('spec_tag')
-      end
-
-      it 'parent_tags に自分自身を指定しても自己参照は作らない' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: 'spec_tag',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(TagImplication.where(tag:, parent_tag: tag)).not_to exist
-        expect(tag.reload.parents).to eq([])
-      end
-
-      it 'initial and update tag versions を作成する' do
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'put_versioned_tag',
-            category: 'meta',
-            aliases: '',
-            parent_tags: '',
-          }
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-
-        versions = tag.reload.tag_versions.order(:version_no)
-
-        expect(versions.map(&:event_type)).to eq(['create', 'update'])
-
-        expect(versions.first.name).to eq('spec_tag')
-        expect(versions.first.category).to eq('general')
-        expect(versions.first.aliases.split).to include('unko')
-
-        expect(versions.second.name).to eq('put_versioned_tag')
-        expect(versions.second.category).to eq('meta')
-        expect(versions.second.aliases.split).to include('spec_tag')
-        expect(versions.second.created_by_user_id).to eq(member_user.id)
-      end
-
-      it 'parent tag の snapshot も作成する' do
-        old_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_snapshot_old_parent'),
-          category: :general
-        )
-        new_parent = Tag.create!(
-          tag_name: TagName.create!(name: 'put_snapshot_new_parent'),
-          category: :general
-        )
-        TagImplication.create!(tag:, parent_tag: old_parent)
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: new_parent.name,
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        expect(old_parent.reload.tag_versions.map(&:event_type)).to include('create')
-        expect(new_parent.reload.tag_versions.map(&:event_type)).to include('create')
-      end
-
-      it 'normal tag を nico category には変更できない' do
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'spec_tag',
-            category: 'nico',
-            aliases: '',
-            parent_tags: '',
-          }
-        }.not_to change(TagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(tag.reload.name).to eq('spec_tag')
-        expect(tag.category).to eq('general')
-      end
-
-      it 'nico tag は更新できない' do
-        nico_tag = Tag.create!(
-          tag_name: TagName.create!(name: 'nico:put_update_all_ng'),
-          category: :nico
-        )
-
-        expect {
-          put "/tags/#{ nico_tag.id }", params: {
-            name: 'nico:put_update_all_renamed',
-            category: 'nico',
-            aliases: '',
-            parent_tags: '',
-          }
-        }.not_to change(NicoTagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(nico_tag.reload.name).to eq('nico:put_update_all_ng')
-        expect(nico_tag.category).to eq('nico')
-      end
-
-      it 'system tag の name は変更できない' do
-        system_tag = Tag.tagme
-        old_name = system_tag.name
-        old_category = system_tag.category
-
-        expect {
-          put "/tags/#{ system_tag.id }", params: {
-            name: 'put_system_tag_renamed',
-            category: old_category,
-            aliases: '',
-            parent_tags: '',
-          }
-        }.not_to change(TagVersion, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-
-        expect(system_tag.reload.name).to eq(old_name)
-        expect(system_tag.category).to eq(old_category)
       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/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

@@ -1,185 +1,59 @@
-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(() => {
     if (!(fullScreen))
@@ -187,18 +61,18 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
 
     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 ()

frontend/src/components/SortHeader.tsx

@@ -1,31 +0,0 @@
-import { useLocation } from 'react-router-dom'
-
-import PrefetchLink from '@/components/PrefetchLink'
-
-
-export default <T extends string,>({ by, label, currentOrder, defaultDirection }: {
-    by:               T
-    label:            string
-    currentOrder:     `${ T }:${ 'asc' | 'desc' }`
-    defaultDirection: Record<T, 'asc' | 'desc'> }) => {
-  const [fld, dir] = currentOrder.split (':')
-
-  const location = useLocation ()
-  const qs = new URLSearchParams (location.search)
-  const nextDir =
-      (by === fld)
-      ? (dir === 'asc' ? 'desc' : 'asc')
-      : (defaultDirection[by] || 'desc')
-  qs.set ('order', `${ by }:${ nextDir }`)
-  qs.set ('page', '1')
-
-  return (
-      <PrefetchLink
-	  className="text-inherit visited:text-inherit hover:text-inherit"
-	  to={`${ location.pathname }?${ qs.toString () }`}>
-	<span className="font-bold">
-	  {label}
-	  {by === fld && (dir === 'asc' ? ' ▲' : ' ▼')}
-	</span>
-      </PrefetchLink>)
-}

frontend/src/components/TagDetailSidebar.tsx

@@ -6,9 +6,8 @@ import { DndContext,
 	 useSensor,
 	 useSensors } from '@dnd-kit/core'
 import { restrictToWindowEdges } from '@dnd-kit/modifiers'
-import { useQueryClient } from '@tanstack/react-query'
+import { AnimatePresence, motion } from 'framer-motion'
-import { motion } from 'framer-motion'
+import { useEffect, useRef, useState } from 'react'
-import { useEffect, useMemo, useRef, useState } from 'react'
 
 import DraggableDroppableTagRow from '@/components/DraggableDroppableTagRow'
 import PrefetchLink from '@/components/PrefetchLink'
@@ -18,9 +17,8 @@ import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { toast } from '@/components/ui/use-toast'
-import { CATEGORIES, CATEGORY_NAMES } from '@/consts'
+import { CATEGORIES } from '@/consts'
 import { apiDelete, apiGet, apiPatch, apiPost } from '@/lib/api'
-import { postsKeys, tagsKeys } from '@/lib/queryKeys'
 import { dateString, originalCreatedAtString } from '@/lib/utils'
 
 import type { DragEndEvent } from '@dnd-kit/core'
@@ -37,27 +35,28 @@ const renderTagTree = (
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
     parentTagId?:     number,
-    sp?:              boolean,
 ): ReactNode[] => {
   const key = `${ path }-${ tag.id }`
 
   const self = (
-      <li key={key} className="mb-1">
+      <motion.li
+	  key={key}
+	  layout
+	  transition={{ duration: .2, ease: 'easeOut' }}
+	  className="mb-1">
 	<DraggableDroppableTagRow
 	    tag={tag}
 	    nestLevel={nestLevel}
 	    pathKey={key}
 	    parentTagId={parentTagId}
-	    suppressClickRef={suppressClickRef}
+	    suppressClickRef={suppressClickRef}/>
-	    sp={sp}/>
+      </motion.li>)
-      </li>)
 
   return [
       self,
       ...((tag.children
 	   ?.sort ((a, b) => a.name < b.name ? -1 : 1)
-	   .flatMap (child =>
+	   .flatMap (child => renderTagTree (child, nestLevel + 1, key, suppressClickRef, tag.id)))
-	      renderTagTree (child, nestLevel + 1, key, suppressClickRef, tag.id, sp)))
 	  ?? [])]
 }
 
@@ -148,34 +147,14 @@ const DropSlot = ({ cat }: { cat: Category }) => {
 }
 
 
-type Props = { post: Post; sp?: boolean }
+type Props = { post: Post | null }
 
 
-export default (({ post, sp }: Props) => {
+export default (({ post }: Props) => {
-  sp = Boolean (sp)
-
-  const qc = useQueryClient ()
-
-  const baseTags = useMemo<TagByCategory> (() => {
-    const tagsTmp = { } as TagByCategory
-
-    for (const tag of post.tags)
-      {
-	if (!(tag.category in tagsTmp))
-	  tagsTmp[tag.category] = []
-	tagsTmp[tag.category].push (tag)
-      }
-
-    for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
-      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
-
-    return tagsTmp
-  }, [post])
-
   const [activeTagId, setActiveTagId] = useState<number | null> (null)
   const [dragging, setDragging] = useState (false)
   const [saving, setSaving] = useState (false)
-  const [tags, setTags] = useState (baseTags)
+  const [tags, setTags] = useState ({ } as TagByCategory)
 
   const suppressClickRef = useRef (false)
 
@@ -184,9 +163,10 @@ export default (({ post, sp }: Props) => {
       useSensor (TouchSensor, { activationConstraint: { delay: 250, tolerance: 8 } }))
 
   const reloadTags = async (): Promise<void> => {
+    if (!(post))
+      return
+
     setTags (buildTagByCategory (await apiGet<Post> (`/posts/${ post.id }`)))
-    qc.invalidateQueries ({ queryKey: postsKeys.root })
-    qc.invalidateQueries ({ queryKey: tagsKeys.root })
   }
 
   const onDragEnd = async (e: DragEndEvent) => {
@@ -275,9 +255,33 @@ export default (({ post, sp }: Props) => {
     }
   }
 
+  const categoryNames: Record<Category, string> = {
+      deerjikist: 'ニジラー',
+      meme:       '原作・ネタ元・ミーム等',
+      character:  'キャラクター',
+      general:    '一般',
+      material:   '素材',
+      meta:       'メタタグ',
+      nico:       'ニコニコタグ' }
+
   useEffect (() => {
-    setTags (baseTags)
+    if (!(post))
-  }, [baseTags])
+      return
+
+    const tagsTmp = { } as TagByCategory
+
+    for (const tag of post.tags)
+      {
+	if (!(tag.category in tagsTmp))
+	  tagsTmp[tag.category] = []
+	tagsTmp[tag.category].push (tag)
+      }
+
+    for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
+      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
+
+    setTags (tagsTmp)
+  }, [post])
 
   return (
       <SidebarComponent>
@@ -310,29 +314,26 @@ export default (({ post, sp }: Props) => {
 	      document.body.style.userSelect = ''
 	    }}
 	    modifiers={[restrictToWindowEdges]}>
+	  <motion.div key={post?.id ?? 0} layout>
 	    {CATEGORIES.map ((cat: Category) => ((tags[cat] ?? []).length > 0 || dragging) && (
-	      <div className="my-3" key={cat}>
+		<motion.div layout className="my-3" key={cat}>
-		<SubsectionTitle>
+		  <SubsectionTitle>{categoryNames[cat]}</SubsectionTitle>
-		  <motion.div
-		      layoutId={`tag-${ sp ? 'sp-' : '' }${ cat }`}
-		      transition={{ layout: { duration: .2, ease: 'easeOut' } }}>
-		    {CATEGORY_NAMES[cat]}
-		  </motion.div>
-		</SubsectionTitle>
 
-		<ul>
+		  <motion.ul layout>
+		    <AnimatePresence initial={false}>
 		      {(tags[cat] ?? []).flatMap (tag => (
-		      renderTagTree (tag, 0, `cat-${ cat }`, suppressClickRef, undefined, sp)))}
+			  renderTagTree (tag, 0, `cat-${ cat }`, suppressClickRef, undefined)))}
 		      <DropSlot cat={cat}/>
-		</ul>
+		    </AnimatePresence>
-	      </div>))}
+		  </motion.ul>
+		</motion.div>))}
 	    {post && (
-	      <motion.div
+		<div>
-		  layoutId={`post-info-${ sp }`}
-		  transition={{ layout: { duration: .2, ease: 'easeOut' } }}>
 		  <SectionTitle>情報</SectionTitle>
 		  <ul>
 		    <li>Id.: {post.id}</li>
+		    {/* TODO: uploadedUser の取得を対応したらコメント外す */}
+		    {/*
 		    <li>
 		      <>耕作者: </>
 		      {post.uploadedUser
@@ -342,6 +343,7 @@ export default (({ post, sp }: Props) => {
 			  </PrefetchLink>)
 		       : 'bot操作'}
 		    </li>
+		    */}
 		    <li>耕作日時: {dateString (post.createdAt)}</li>
 		    <li>
 		      <>リンク: </>
@@ -364,7 +366,8 @@ export default (({ post, sp }: Props) => {
 		      </PrefetchLink>
 		    </li>
 		  </ul>
-	      </motion.div>)}
+		</div>)}
+	  </motion.div>
 
 	  <DragOverlay adjustScale={false}>
 	    <div className="pointer-events-none">

frontend/src/components/TagLink.tsx

@@ -1,5 +1,8 @@
+import { useEffect, useState } from 'react'
+
 import PrefetchLink from '@/components/PrefetchLink'
 import { LIGHT_COLOUR_SHADE, DARK_COLOUR_SHADE, TAG_COLOUR } from '@/consts'
+import { apiGet } from '@/lib/api'
 import { cn } from '@/lib/utils'
 
 import type { ComponentProps, FC, HTMLAttributes } from 'react'
@@ -10,7 +13,8 @@ type CommonProps = {
     tag:        Tag
     nestLevel?: number
     withWiki?:  boolean
-    withCount?: boolean }
+    withCount?: boolean
+    prefetch?:  boolean }
 
 type PropsWithLink =
     & CommonProps
@@ -32,7 +36,37 @@ export default (({ tag,
 		   linkFlg   = true,
 		   withWiki  = true,
 		   withCount = true,
+		   prefetch  = false,
 		   ...props }: Props) => {
+  const [havingWiki, setHavingWiki] = useState (true)
+
+  const wikiExists = async (tag: Tag) => {
+    if ('hasWiki' in tag)
+      {
+	setHavingWiki (tag.hasWiki)
+	return
+      }
+
+    const tagName = (tag as Tag).name
+
+    try
+    {
+      await apiGet (`/wiki/title/${ encodeURIComponent (tagName) }/exists`)
+      setHavingWiki (true)
+    }
+    catch
+    {
+      setHavingWiki (false)
+    }
+  }
+
+  useEffect (() => {
+    if (!(linkFlg) || !(withWiki))
+      return
+
+    wikiExists (tag)
+  }, [tag.name, linkFlg, withWiki])
+
   const spanClass = cn (
       `text-${ TAG_COLOUR[tag.category] }-${ LIGHT_COLOUR_SHADE }`,
       `dark:text-${ TAG_COLOUR[tag.category] }-${ DARK_COLOUR_SHADE }`)
@@ -45,39 +79,19 @@ export default (({ tag,
       <>
 	{(linkFlg && withWiki) && (
 	    <span className="mr-1">
-	      {(tag.materialId != null || tag.hasWiki)
+	      {havingWiki
 	       ? (
-		  tag.materialId == null
+		  <PrefetchLink to={`/wiki/${ encodeURIComponent (tag.name) }`}
-		  ? (
-		      <PrefetchLink
-			  to={`/wiki/${ encodeURIComponent (tag.name) }`}
 			className={linkClass}>
 		    ?
 		  </PrefetchLink>)
 	       : (
-		      <PrefetchLink
+		  <PrefetchLink to={`/wiki/${ encodeURIComponent (tag.name) }`}
-			  to={`/materials/${ tag.materialId }`}
-			  className={linkClass}>
-			?
-		      </PrefetchLink>))
-	       : (
-		  ['character', 'material'].includes (tag.category)
-		  ? (
-		      <PrefetchLink
-			  to={`/materials/new?tag=${ encodeURIComponent (tag.name) }`}
-			  className="animate-[wiki-blink_.25s_steps(2,end)_infinite]
-				     dark:animate-[wiki-blink-dark_.25s_steps(2,end)_infinite]"
-			  title={`${ tag.name } 素材情報が存在しません．`}>
-			!
-		      </PrefetchLink>)
-		  : (
-		      <PrefetchLink
-			  to={`/wiki/${ encodeURIComponent (tag.name) }`}
 			className="animate-[wiki-blink_.25s_steps(2,end)_infinite]
 				   dark:animate-[wiki-blink-dark_.25s_steps(2,end)_infinite]"
 			title={`${ tag.name } Wiki が存在しません．`}>
 		    !
-		      </PrefetchLink>))}
+		  </PrefetchLink>)}
 	    </span>)}
 	{nestLevel > 0 && (
 	    <span
@@ -94,7 +108,14 @@ export default (({ tag,
 	    </>)}
 	{linkFlg
 	 ? (
-	    <PrefetchLink
+	    prefetch
+	    ? <PrefetchLink
+		  to={`/posts?${ (new URLSearchParams ({ tags: tag.name })).toString () }`}
+		  className={linkClass}
+		  {...props}>
+		{tag.name}
+	      </PrefetchLink>
+	    : <PrefetchLink
 		  to={`/posts?${ (new URLSearchParams ({ tags: tag.name })).toString () }`}
 		  className={linkClass}
 		  {...props}>

frontend/src/components/TagSearch.tsx

@@ -56,11 +56,8 @@ export default (() => {
       if (activeIndex < 0)
 	break
       ev.preventDefault ()
-      {
       const selected = suggestions[activeIndex]
-	if (selected)
+      selected && handleTagSelect (selected)
-	  handleTagSelect (selected)
-      }
       break
 
     case 'Escape':
@@ -70,25 +67,14 @@ export default (() => {
     }
     if (ev.key === 'Enter' && (!(suggestionsVsbl) || activeIndex < 0))
       {
-	const parts = search.split (' ')
+	navigate (`/posts?${ (new URLSearchParams ({ tags: search })).toString () }`)
-	const match = parts.map (t => t.toLowerCase ()).includes ('type:or') ? 'any' : 'all'
-	navigate (`/posts?${
-	    (new URLSearchParams ({
-		tags: parts.map (t => t.toLowerCase ())
-			   .filter (t => t !== 'type:or')
-			   .join (' '),
-		match }))
-	    .toString () }`)
 	setSuggestionsVsbl (false)
       }
   }
 
   const handleTagSelect = (tag: Tag) => {
     const parts = search.split (' ')
-    parts[parts.length - 1] = (
+    parts[parts.length - 1] = tag.name
-	(parts[parts.length - 1].slice(0, 4).toLowerCase () === 'not:')
-	? ('not:' + tag.name)
-	: tag.name)
     setSearch (parts.join (' ') + ' ')
     setSuggestions ([])
     setActiveIndex (-1)
@@ -96,8 +82,7 @@ export default (() => {
 
   useEffect (() => {
     const query = new URLSearchParams (location.search)
-    const anyFlg = query.get ('match') === 'any'
+    const tagsQuery = query.get ('tags') ?? ''
-    const tagsQuery = `${ query.get ('tags') ?? '' }${ anyFlg ? ' type:or' : '' }`
     setSearch (tagsQuery)
   }, [location.search])
 

frontend/src/components/TagSidebar.tsx

@@ -65,14 +65,11 @@ export default (({ posts, onClick }: Props) => {
 	  {CATEGORIES.flatMap (cat => cat in tags ? (
 	      tags[cat].map (tag => (
 		  <li key={tag.id} className="mb-1">
-		    <motion.div
+		    <TagLink tag={tag} prefetch onClick={onClick}/>
-			transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-			layoutId={`tag-${ tag.id }`}>
-		      <TagLink tag={tag} onClick={onClick}/>
-		    </motion.div>
 		  </li>))) : [])}
 	</ul>
 	<SectionTitle>関聯</SectionTitle>
+	{posts.length > 0 && (
 	    <a href="#"
 	       onClick={ev => {
 		 ev.preventDefault ()
@@ -91,7 +88,7 @@ export default (({ posts, onClick }: Props) => {
 		 }) ())
 	       }}>
 	      ランダム
-	</a>
+	    </a>)}
       </>)
 
   return (
@@ -99,19 +96,23 @@ export default (({ posts, onClick }: Props) => {
 	<TagSearch/>
 
 	<div className="hidden md:block mt-4">
-	  {posts.length > 0 && TagBlock}
+	  {TagBlock}
 	</div>
 
 	<AnimatePresence initial={false}>
 	  {tagsVsbl && (
 	      <motion.div
 		  key="sptags"
-		  className="md:hidden overflow-hidden"
+		  className="md:hidden mt-4"
-		  initial={{ height: 0 }}
+		  variants={{ hidden:   { clipPath: 'inset(0 0 100% 0)',
-		  animate={{ height: 'auto' }}
+					  height:   0 },
-		  exit={{ height: 0 }}
+			      visible:  { clipPath: 'inset(0 0 0% 0)',
+					  height:   'auto'} }}
+		  initial="hidden"
+		  animate="visible"
+		  exit="hidden"
 		  transition={{ duration: .2, ease: 'easeOut' }}>
-		{posts.length > 0 && TagBlock}
+		{TagBlock}
 	      </motion.div>)}
 	</AnimatePresence>
 

frontend/src/components/TopNav.tsx

@@ -8,78 +8,17 @@ import PrefetchLink from '@/components/PrefetchLink'
 import TopNavUser from '@/components/TopNavUser'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
 import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
-import { fetchTag, fetchTagByName } from '@/lib/tags'
+import { fetchTagByName } from '@/lib/tags'
 import { cn } from '@/lib/utils'
 import { fetchWikiPage } from '@/lib/wiki'
 
 import type { FC, MouseEvent } from 'react'
 
-import type { Menu, MenuVisibleItem, Tag, User } from '@/types'
+import type { Menu, User } from '@/types'
 
 type Props = { user: User | null }
 
 
-export const menuOutline = ({ tag, wikiId, user, pathName }: { 
-    tag?: Tag | null
-    wikiId: number | null
-    user: User | null,
-    pathName: string }): Menu => {
-  const postCount = tag?.postCount ?? 0
-
-  const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^\/]+/.test (pathName) && wikiId)
-  const wikiTitle = pathName.split ('/')[2] ?? ''
-
-  const tagFlg = /^\/tags\/\d+/.test (pathName)
-
-  return [
-      { name: '広場', to: '/posts', subMenu: [
-	  { name: '一覧', to: '/posts' },
-	  { name: '検索', to: '/posts/search' },
-	  { name: '追加', to: '/posts/new' },
-	  { name: '履歴', to: '/posts/changes' },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:広場' }] },
-      { name: 'タグ', to: '/tags', subMenu: [
-	  { name: 'マスタ', to: '/tags' },
-	  { name: 'ニコニコ連携', to: '/tags/nico' },
-	  { name: '履歴', to: '/tags/changes' },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:タグ' },
-	  { component: <Separator/>, visible: tagFlg },
-	  { name: `広場 (${ postCount || 0 })`,
-	    to: `/posts?tags=${ encodeURIComponent (tag?.name ?? '') }`,
-	    visible: tagFlg },
-	  { name: '履歴', to: `/tags/changes?id=${ tag?.id }`,
-	    visible: tagFlg && tag?.category !== 'nico' }] },
-      { name: '素材', to: '/materials', visible: false, subMenu: [
-	  { name: '一覧', to: '/materials' },
-	  { name: '検索', to: '/materials/search', visible: false }, 
-	  { name: '追加', to: '/materials/new' },
-	  { name: '履歴', to: '/materials/changes', visible: false },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材集' }] },
-      { name: '上映会', to: '/theatres/1', base: '/theatres', subMenu: [
-	  { name: <>第&thinsp;1&thinsp;会場</>, to: '/theatres/1' },
-	  { name: 'CyTube', to: '//cytube.mm428.net/r/deernijika' },
-	  { name: <>ニジカ放送局第&thinsp;1&thinsp;チャンネル</>,
-	    to: '//www.youtube.com/watch?v=DCU3hL4Uu6A' },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:上映会' }] },
-      { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
-	  { name: '検索', to: '/wiki' },
-	  { name: '新規', to: '/wiki/new' },
-	  { name: '全体履歴', to: '/wiki/changes' },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:Wiki' },
-	  { component: <Separator/>, visible: wikiPageFlg },
-	  { name: `広場 (${ postCount || 0 })`, to: `/posts?tags=${ wikiTitle }`,
-	    visible: wikiPageFlg },
-	  { name: '履歴', to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
-	  { name: '編輯', to: `/wiki/${ wikiId || wikiTitle }/edit`, visible: wikiPageFlg }] },
-      { name: 'ユーザ', to: '/users/settings', visible: false, subMenu: [
-	  { name: '一覧', to: '/users', visible: false },
-	  { name: 'お前', to: `/users/${ user?.id }`, visible: false },
-	  { name: '設定', to: '/users/settings', visible: Boolean (user) }] },
-      { name: '法規', visible: false, subMenu: [
-	  { name: '利用規約', to: '/tos' }] }]
-}
-
-
 export default (({ user }: Props) => {
   const location = useLocation ()
 
@@ -87,30 +26,25 @@ export default (({ user }: Props) => {
   const itemsRef = useRef<(HTMLAnchorElement | null)[]> ([])
   const navRef = useRef<HTMLDivElement | null> (null)
 
-  const measure = (idx: number) => {
+  const measure = () => {
     const nav = navRef.current
-    const el = itemsRef.current[idx < 0 ? visibleMenu.length : idx]
+    const el = itemsRef.current[activeIdx]
-
+    if (!(nav) || !(el) || activeIdx < 0)
-    if (!(nav) || !(el))
-      {
-	setHL ({ left: 0, width: 0, visible: true })
       return
-      }
 
     const navRect = nav.getBoundingClientRect ()
     const elRect = el.getBoundingClientRect ()
 
-    setHL ({ left:    elRect.left - navRect.left,
+    setHl ({ left:    elRect.left - navRect.left,
 	     width:   elRect.width,
 	     visible: true })
   }
 
-  const [hl, setHL] = useState<{ left: number; width: number; visible: boolean }> ({
+  const [hl, setHl] = useState<{ left: number; width: number; visible: boolean }> ({
       left:     0,
       width:    0,
       visible:  false })
   const [menuOpen, setMenuOpen] = useState (false)
-  const [moreVsbl, setMoreVsbl] = useState (false)
   const [openItemIdx, setOpenItemIdx] = useState (-1)
   const [wikiId, setWikiId] = useState<number | null> (WikiIdBus.get ())
 
@@ -121,19 +55,46 @@ export default (({ user }: Props) => {
       queryKey: wikiKeys.show (wikiIdStr, { }),
       queryFn: () => fetchWikiPage (wikiIdStr, { }) })
 
-  const tagFlg = /^\/tags\/\d+/.test (location.pathname)
+  const effectiveTitle = wikiPage?.title ?? ''
-  const effectiveTitle = (tagFlg ? location.pathname.split ('/')[2] : wikiPage?.title) ?? ''
 
   const { data: tag } = useQuery ({
       enabled: Boolean (effectiveTitle),
       queryKey: tagsKeys.show (effectiveTitle),
-      queryFn: () => (tagFlg ? fetchTag : fetchTagByName) (effectiveTitle) })
+      queryFn: () => fetchTagByName (effectiveTitle) })
 
+  const postCount = tag?.postCount ?? 0
 
-  const menu = menuOutline ({ tag, wikiId, user, pathName: location.pathname })
+  const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^\/]+/.test (location.pathname) && wikiId)
-  const visibleMenu = menu.filter ((item): item is MenuVisibleItem => item.visible ?? true)
+  const wikiTitle = location.pathname.split ('/')[2] ?? ''
-  const activeIdx =
+  const menu: Menu = [
-      visibleMenu.findIndex (item => location.pathname.startsWith (item.base || item.to))
+      { name: '広場', to: '/posts', subMenu: [
+	  { name: '一覧', to: '/posts' },
+	  { name: '検索', to: '/posts/search' },
+	  { name: '投稿追加', to: '/posts/new' },
+	  { name: '履歴', to: '/posts/changes' },
+	  { name: 'ヘルプ', to: '/wiki/ヘルプ:広場' }] },
+      { name: 'タグ', to: '/tags', subMenu: [
+	  { name: 'タグ一覧', to: '/tags', visible: false },
+	  { name: '別名タグ', to: '/tags/aliases', visible: false },
+	  { name: '上位タグ', to: '/tags/implications', visible: false },
+	  { name: 'ニコニコ連携', to: '/tags/nico' },
+	  { name: 'ヘルプ', to: '/wiki/ヘルプ:タグ' }] },
+      { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
+	  { name: '検索', to: '/wiki' },
+	  { name: '新規', to: '/wiki/new' },
+	  { name: '全体履歴', to: '/wiki/changes' },
+	  { name: 'ヘルプ', to: '/wiki/ヘルプ:Wiki' },
+	  { component: <Separator/>, visible: wikiPageFlg },
+	  { name: `広場 (${ postCount || 0 })`, to: `/posts?tags=${ wikiTitle }`,
+	    visible: wikiPageFlg },
+	  { name: '履歴', to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
+	  { name: '編輯', to: `/wiki/${ wikiId || wikiTitle }/edit`, visible: wikiPageFlg }] },
+      { name: 'ユーザ', to: '/users', subMenu: [
+	  { name: '一覧', to: '/users', visible: false },
+	  { name: 'お前', to: `/users/${ user?.id }`, visible: false },
+	  { name: '設定', to: '/users/settings', visible: Boolean (user) }] }]
+
+  const activeIdx = menu.findIndex (item => location.pathname.startsWith (item.base || item.to))
 
   const prevActiveIdxRef = useRef<number> (activeIdx)
 
@@ -146,31 +107,35 @@ export default (({ user }: Props) => {
   const dir = dirRef.current
 
   useLayoutEffect (() => {
-    const raf = requestAnimationFrame (() => measure (moreVsbl ? -1 : activeIdx))
+    if (activeIdx < 0)
-    const onResize = () => requestAnimationFrame (() => measure (moreVsbl ? -1 : activeIdx))
+      return
+
+    const raf = requestAnimationFrame (measure)
+    const onResize = () => requestAnimationFrame (measure)
 
     addEventListener ('resize', onResize)
     return () => {
       cancelAnimationFrame (raf)
       removeEventListener ('resize', onResize)
     }
-  })
+  }, [activeIdx])
 
   useEffect (() => {
     const unsubscribe = WikiIdBus.subscribe (setWikiId)
     return () => unsubscribe ()
-  }, [activeIdx])
+  }, [])
 
   useEffect (() => {
     setMenuOpen (false)
-    setOpenItemIdx (activeIdx)
+    setOpenItemIdx (menu.findIndex (item => (
+	location.pathname.startsWith (item.base || item.to))))
   }, [location])
 
   return (
       <>
-	<nav className="px-3 flex justify-between items-center w-full
+	<nav className="px-3 flex justify-between items-center w-full min-h-[48px]
 			bg-yellow-200 dark:bg-red-975 md:bg-yellow-50">
-	  <div className="flex items-center gap-2 h-12">
+	  <div className="flex items-center gap-2 h-full">
 	    <PrefetchLink
 		to="/posts"
 		className="mx-4 text-xl font-bold text-pink-600 hover:text-pink-400
@@ -181,25 +146,18 @@ export default (({ user }: Props) => {
 	      ぼざクリ タグ広場
 	    </PrefetchLink>
 
-	    <div ref={navRef} className="relative hidden md:flex h-12 items-center">
+	    <div ref={navRef} className="relative hidden md:flex h-full items-center">
 	      <div aria-hidden
-		   className={cn ('absolute inset-y-0 h-12',
+		   className={cn ('absolute top-1/2 -translate-y-1/2 h-full',
 				  'bg-yellow-200 dark:bg-red-950',
 				  'transition-[transform,width] duration-200 ease-out')}
 		   style={{ width:      hl.width,
-			    transform:  `translateX(${ hl.left }px)`,
+			    transform:  `translate(${ hl.left }px, -50%)`,
 			    opacity:    hl.visible ? 1 : 0 }}/>
 
-	      {visibleMenu.map ((item, i) => (
+	      {menu.map ((item, i) => (
-		  <motion.div
-		      key={item.to}
-		      layoutId={`menu-${ item.name }`}
-		      animate={{ opacity: moreVsbl ? 0 : 1 }}
-		      transition={{ opacity: { duration: .12 },
-				    layout: { duration: .2, ease: 'easeOut' } }}
-		      style={{ pointerEvents: moreVsbl ? 'none' : 'auto' }}
-		      onMouseEnter={() => setMoreVsbl (false)}>
 		  <PrefetchLink
+		      key={i}
 		      to={item.to}
 		      ref={(el: (HTMLAnchorElement | null)) => {
 			itemsRef.current[i] = el
@@ -207,22 +165,7 @@ export default (({ user }: Props) => {
 		      className={cn ('relative z-10 flex h-full items-center px-5',
 				     (i === openItemIdx) && 'font-bold')}>
 		    {item.name}
-		    </PrefetchLink>
+		  </PrefetchLink>))}
-		  </motion.div>))}
-	      <PrefetchLink
-		  to="/more"
-		  ref={(el: (HTMLAnchorElement | null)) => {
-		    itemsRef.current[visibleMenu.length] = el
-		  }}
-		  onClick={() => setMoreVsbl (false)}
-		  onMouseEnter={() => {
-		    setMoreVsbl (true)
-		    measure (-1)
-		  }}
-		  className={cn ('relative z-10 flex h-full items-center px-5',
-				 (openItemIdx < 0 || moreVsbl) && 'font-bold')}>
-		その他 &raquo;
-	      </PrefetchLink>
 	    </div>
 	  </div>
 
@@ -240,75 +183,8 @@ export default (({ user }: Props) => {
 	  </a>
 	</nav>
 
-	<AnimatePresence initial={false}>
+	<div className="relative hidden md:flex bg-yellow-200 dark:bg-red-950
-	  <motion.div
+			items-center w-full min-h-[40px] overflow-hidden">
-	      key="submenu-shell"
-	      layout
-	      className="relative hidden md:block overflow-hidden
-			 bg-yellow-200 dark:bg-red-950"
-	      style={{ height: moreVsbl ? 40 * menu.length : (activeIdx < 0 ? 0 : 40) }}
-	      onMouseLeave={() => {
-		if (moreVsbl)
-		  setMoreVsbl (false)
-	      }}
-	      transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-	      onAnimationComplete={() => {
-		measure (moreVsbl ? -1 : activeIdx)
-	      }}>
-	  {moreVsbl
-	   ? (
-	      menu.map ((item, i) => (
-		  <div key={i} className="relative h-[40px]">
-		    <div className="absolute inset-0 flex items-center px-3">
-		      <motion.div
-			  transition={{ duration: .2, ease: 'easeOut' }}
-			  {...((item.visible ?? true)
-			       ? { layoutId: `menu-${ item.name }` }
-			       : { initial: { x: 40, y: -40, opacity: 0 },
-				   animate: { x: 0, y: 0, opacity: 1 },
-				   exit: { x: 40, y: -40, opacity: 0 } })}
-			  className="z-10 h-full flex items-center px-3 font-bold w-24">
-			<h2>{item.name}</h2>
-		      </motion.div>
-		      {item.subMenu
-		       .filter (subItem => subItem.visible ?? true)
-		       .map ((subItem, j) => (
-			  'component' in subItem
-			  ? (
-			      <motion.div
-				  key={`c-${ i }-${ j }`}
-				  transition={{ duration: .2, ease: 'easeOut' }}
-				  {...((visibleMenu[activeIdx]?.name
-					=== item.name)
-				       ? { layoutId: `submenu-${ item.name }-${ j }` }
-				       : { initial: { y: -40, opacity: 0 },
-					   animate: { y: 0, opacity: 1 },
-					   exit: { y: -40, opacity: 0 } })}>
-				{subItem.component}
-			      </motion.div>)
-			  : (
-			      <motion.div
-				  key={`l-${ i }-${ j }`}
-				  transition={{ duration: .2, ease: 'easeOut' }}
-				  {...((visibleMenu[activeIdx]?.name
-					=== item.name)
-				       ? { layoutId: `submenu-${ item.name }-${ j }` }
-				       : { initial: { y: -40, opacity: 0 },
-					   animate: { y: 0, opacity: 1 },
-					   exit: { y: -40, opacity: 0 } })}>
-				<PrefetchLink
-				    to={subItem.to}
-				    target={subItem.to.slice (0, 2) === '//' ? '_blank' : undefined}
-				    onClick={() => setMoreVsbl (false)}
-				    className="h-full flex items-center px-3">
-				  {subItem.name}
-				</PrefetchLink>
-			      </motion.div>)))}
-		    </div>
-		  </div>)))
-	   : ((visibleMenu[activeIdx]?.subMenu ?? []).length > 0
-	      && (
-		  <div className="relative h-[40px]">
 	  <AnimatePresence initial={false} custom={dir}>
 	    <motion.div
 		key={activeIdx}
@@ -321,34 +197,21 @@ export default (({ user }: Props) => {
 		animate="centre"
 		exit="exit"
 		transition={{ duration: .2, ease: 'easeOut' }}>
-			{(visibleMenu[activeIdx]?.subMenu ?? [])
+	      {(menu[activeIdx]?.subMenu ?? [])
 	       .filter (item => item.visible ?? true)
 	       .map ((item, i) => (
 		  'component' in item
-			    ? (
+		  ? <Fragment key={`c-${ i }`}>{item.component}</Fragment>
-				<motion.div
-				    key={`c-${ i }`}
-				    transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-				    layoutId={`submenu-${ visibleMenu[activeIdx].name }-${ i }`}>
-				  {item.component}
-				</motion.div>)
 		  : (
-				<motion.div
-				    key={`l-${ i }`}
-				    transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-				    layoutId={`submenu-${ visibleMenu[activeIdx].name }-${ i }`}>
 		      <PrefetchLink
+			  key={`l-${ i }`}
 			  to={item.to}
-				      target={item.to.slice (0, 2) === '//' ? '_blank' : undefined}
 			  className="h-full flex items-center px-3">
 			{item.name}
-				  </PrefetchLink>
+		      </PrefetchLink>)))}
-				</motion.div>)))}
-		      </motion.div>
-		    </AnimatePresence>
-		  </div>))}
 	    </motion.div>
 	  </AnimatePresence>
+	</div>
 
 	<AnimatePresence initial={false}>
 	  {menuOpen && (
@@ -365,7 +228,7 @@ export default (({ user }: Props) => {
 		  exit="closed"
 		  transition={{ duration: .2, ease: 'easeOut' }}>
 		<Separator/>
-		{visibleMenu.map ((item, i) => (
+		{menu.map ((item, i) => (
 		    <Fragment key={i}>
 		      <PrefetchLink
 			  to={i === openItemIdx ? item.to : '#'}
@@ -409,25 +272,12 @@ export default (({ user }: Props) => {
 				      <PrefetchLink
 					  key={`sp-l-${ i }-${ j }`}
 					  to={subItem.to}
-					  target={subItem.to.slice (0, 2) === '//'
-						  ? '_blank'
-						  : undefined}
 					  className="w-full min-h-[36px] flex items-center pl-12">
 					{subItem.name}
 				      </PrefetchLink>)))}
 			    </motion.div>)}
 		      </AnimatePresence>
 		    </Fragment>))}
-		<PrefetchLink
-		    to="/more"
-		    ref={(el: (HTMLAnchorElement | null)) => {
-		      itemsRef.current[visibleMenu.length] = el
-		    }}
-		    className={cn ('w-full min-h-[40px] flex items-center pl-8',
-				   ((openItemIdx < 0)
-				    && 'font-bold bg-yellow-50 dark:bg-red-950'))}>
-		  その他 &raquo;
-		</PrefetchLink>
 		<TopNavUser user={user} sp/>
 		<Separator/>
 	      </motion.div>)}

frontend/src/components/WikiBody.tsx

@@ -4,6 +4,8 @@ import ReactMarkdown from 'react-markdown'
 import remarkGFM from 'remark-gfm'
 
 import PrefetchLink from '@/components/PrefetchLink'
+import SectionTitle from '@/components/common/SectionTitle'
+import SubsectionTitle from '@/components/common/SubsectionTitle'
 import { wikiKeys } from '@/lib/queryKeys'
 import remarkWikiAutoLink from '@/lib/remark-wiki-autolink'
 import { fetchWikiPages } from '@/lib/wiki'
@@ -14,7 +16,11 @@ import type { Components } from 'react-markdown'
 type Props = { title: string
 	       body?: string }
 
-const mdComponents = { a: (({ href, children }) => (
+const mdComponents = { h1:  ({ children }) => <SectionTitle>{children}</SectionTitle>,
+		       h2:  ({ children }) => <SubsectionTitle>{children}</SubsectionTitle>,
+		       ol:  ({ children }) => <ol className="list-decimal pl-6">{children}</ol>,
+		       ul:  ({ children }) => <ul className="list-disc pl-6">{children}</ul>,
+		       a:   (({ href, children }) => (
 				['/', '.'].some (e => href?.startsWith (e))
 			        ? <PrefetchLink to={href!}>{children}</PrefetchLink>
 			        : (

frontend/src/components/common/Pagination.tsx

@@ -48,7 +48,7 @@ const getPages = (
 }
 
 
-export default (({ page, totalPages, siblingCount = 3 }) => {
+export default (({ page, totalPages, siblingCount = 4 }) => {
   const location = useLocation ()
 
   const buildTo = (p: number) => {
@@ -63,65 +63,19 @@ export default (({ page, totalPages, siblingCount = 3 }) => {
       <nav className="mt-4 flex justify-center" aria-label="Pagination">
 	<div className="flex items-center gap-2">
 	  {(page > 1)
-	   ? (
+	   ? <PrefetchLink to={buildTo (page - 1)} aria-label="前のページ">&lt;</PrefetchLink>
-	      <>
+	   : <span aria-hidden>&lt;</span>}
-		<PrefetchLink
-		    className="md:hidden p-2"
-		    to={buildTo (1)}
-		    aria-label="最初のページ">
-		  |&lt;
-		</PrefetchLink>
-		<PrefetchLink
-		    className="p-2"
-		    to={buildTo (page - 1)}
-		    aria-label="前のページ">
-		  &lt;
-		</PrefetchLink>
-	      </>)
-	   : (
-	      <>
-		<span className="md:hidden p-2" aria-hidden>
-		  |&lt;
-		</span>
-		<span className="p-2" aria-hidden>
-		  &lt;
-		</span>
-	      </>)}
 
 	  {pages.map ((p, idx) => (
 	      (p === '…')
-	      ? <span key={`dots-${ idx }`} className="hidden md:block p-2">…</span>
+	      ? <span key={`dots-${ idx }`}>…</span>
 	      : ((p === page)
-		 ? <span key={p} className="font-bold p-2" aria-current="page">{p}</span>
+		 ? <span key={p} className="font-bold" aria-current="page">{p}</span>
-		 : (
+		 : <PrefetchLink key={p} to={buildTo (p)}>{p}</PrefetchLink>)))}
-		    <PrefetchLink
-			key={p}
-			className="hidden md:block p-2"
-			to={buildTo (p)}>
-		      {p}
-		    </PrefetchLink>))))}
 
 	  {(page < totalPages)
-	   ? (
+	   ? <PrefetchLink to={buildTo (page + 1)} aria-label="次のページ">&gt;</PrefetchLink>
-	      <>
+	   : <span aria-hidden>&gt;</span>}
-		<PrefetchLink
-		    className="p-2"
-		    to={buildTo (page + 1)}
-		    aria-label="次のページ">
-		  &gt;
-		</PrefetchLink>
-		<PrefetchLink
-		    className="md:hidden p-2"
-		    to={buildTo (totalPages)}
-		    aria-label="最後のページ">
-		  &gt;|
-		</PrefetchLink>
-	      </>)
-	   : (
-	      <>
-		<span className="p-2" aria-hidden>&gt;</span>
-		<span className="md:hidden p-2" aria-hidden>&gt;|</span>
-	      </>)}
 	</div>
       </nav>)
 }) satisfies FC<Props>

frontend/src/components/common/SectionTitle.tsx

@@ -1,11 +1,9 @@
-import { cn } from '@/lib/utils'
+import React from 'react'
 
-import type { ComponentPropsWithoutRef, FC } from 'react'
+type Props = { children: React.ReactNode }
-
-type Props = ComponentPropsWithoutRef<'h2'>
 
 
-export default (({ children, className, ...rest }: Props) => (
+export default ({ children }: Props) => (
-    <h2 {...rest} className={cn ('text-xl my-4', className)}>
+    <h2 className="text-xl my-4">
       {children}
-    </h2>)) satisfies FC<Props>
+    </h2>)

frontend/src/components/common/TagInput.tsx

@@ -1,97 +0,0 @@
-import { useState } from 'react'
-
-import TagSearchBox from '@/components/TagSearchBox'
-import { apiGet } from '@/lib/api'
-
-import type { FC, ChangeEvent, KeyboardEvent } from 'react'
-
-import type { Tag } from '@/types'
-
-
-type Props = {
-    value:      string
-    setValue:   (value: string) => void }
-
-export default (({ value, setValue }: Props) => {
-  const [activeIndex, setActiveIndex] = useState (-1)
-  const [suggestions, setSuggestions] = useState<Tag[]> ([])
-  const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
-
-  // TODO: TagSearch からのコピペのため，共通化を考へる．
-  const whenChanged = async (ev: ChangeEvent<HTMLInputElement>) => {
-    setValue (ev.target.value)
-
-    const q = ev.target.value.trim ().split (' ').at (-1)
-    if (!(q))
-      {
-	setSuggestions ([])
-	return
-      }
-
-    const data = await apiGet<Tag[]> ('/tags/autocomplete', { params: { q } })
-    setSuggestions (data.filter (t => t.postCount > 0))
-    if (suggestions.length > 0)
-      setSuggestionsVsbl (true)
-  }
-
-  // TODO: TagSearch からのコピペのため，共通化を考へる．
-  const handleTagSelect = (tag: Tag) => {
-    const parts = value?.split (' ')
-    parts[parts.length - 1] = tag.name
-    setValue (parts.join (' ') + ' ')
-    setSuggestions ([])
-    setActiveIndex (-1)
-  }
-
-  // TODO: TagSearch からのコピペのため，共通化を考へる．
-  const handleKeyDown = (ev: KeyboardEvent<HTMLInputElement>) => {
-    switch (ev.key)
-    {
-    case 'ArrowDown':
-      ev.preventDefault ()
-      setActiveIndex (i => Math.min (i + 1, suggestions.length - 1))
-      setSuggestionsVsbl (true)
-      break
-
-    case 'ArrowUp':
-      ev.preventDefault ()
-      setActiveIndex (i => Math.max (i - 1, -1))
-      setSuggestionsVsbl (true)
-      break
-
-    case 'Enter':
-      if (activeIndex < 0)
-	break
-      ev.preventDefault ()
-      const selected = suggestions[activeIndex]
-      selected && handleTagSelect (selected)
-      break
-
-    case 'Escape':
-      ev.preventDefault ()
-      setSuggestionsVsbl (false)
-      break
-    }
-    if (ev.key === 'Enter' && (!(suggestionsVsbl) || activeIndex < 0))
-      {
-	setSuggestionsVsbl (false)
-      }
-  }
-
-  return (
-      <div className="relative">
-	<input
-	    type="text"
-	    value={value}
-	    onChange={whenChanged}
-	    onFocus={() => setSuggestionsVsbl (true)}
-	    onBlur={() => setSuggestionsVsbl (false)}
-	    onKeyDown={handleKeyDown}
-	    className="w-full border p-2 rounded"/>
-	<TagSearchBox
-	    suggestions={
-		suggestionsVsbl && suggestions.length > 0 ? suggestions : [] as Tag[]}
-	    activeIndex={activeIndex}
-	    onSelect={handleTagSelect}/>
-      </div>)
-}) satisfies FC<Props>

frontend/src/components/layout/MainArea.tsx

@@ -1,5 +1,3 @@
-import { motion } from 'framer-motion'
-
 import { cn } from '@/lib/utils'
 
 import type { FC, ReactNode } from 'react'
@@ -10,9 +8,6 @@ type Props = {
 
 
 export default (({ children, className }: Props) => (
-    <motion.main
+    <main className={cn ('flex-1 overflow-y-auto p-4', className)}>
-	transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-	className={cn ('flex-1 overflow-y-auto p-4', className)}
-	layout="position">
       {children}
-    </motion.main>)) satisfies FC<Props>
+    </main>)) satisfies FC<Props>

frontend/src/components/layout/SidebarComponent.tsx

@@ -1,30 +1,9 @@
-import { motion } from 'framer-motion'
+import React from 'react'
-import { Helmet } from 'react-helmet-async'
 
-import type { FC, ReactNode } from 'react'
+type Props = { children: React.ReactNode }
-
-type Props = { children: ReactNode }
 
 
-export default (({ children }: Props) => (
+export default ({ children }: Props) => (
-    <motion.div
+    <div className="p-4 w-full md:w-64 md:h-full">
-	layout="position"
-	transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-	className="p-4 w-full md:w-64 md:h-full md:overflow-y-auto sidebar">
-      <Helmet>
-	<style>
-	  {`
-	      .sidebar
-	      {
-		direction: rtl;
-	      }
-
-	      .sidebar > *
-	      {
-		direction: ltr;
-	      }`}
-	</style>
-      </Helmet>
-
       {children}
-    </motion.div>)) satisfies FC<Props>
+    </div>)

frontend/src/consts.ts

@@ -13,16 +13,6 @@ export const CATEGORIES = [
     'nico',
     ] as const
 
-export const CATEGORY_NAMES: Record<Category, string> = {
-    deerjikist: 'ニジラー',
-    meme:       '原作・ネタ元・ミーム等',
-    character:  'キャラクター',
-    general:    '一般',
-    material:   '素材',
-    meta:       'メタタグ',
-    nico:       'ニコニコタグ',
-    } as const
-
 export const FETCH_POSTS_ORDER_FIELDS = [
     'title',
     'url',

frontend/src/index.css

@@ -46,12 +46,10 @@ a
 body
 {
   margin: 0;
+  display: flex;
+  place-items: center;
   min-width: 320px;
-}
+  min-height: 100vh;
-
-#root
-{
-  min-height: 100dvh;
 }
 
 h1

frontend/src/lib/posts.ts

@@ -1,11 +1,11 @@
 import { apiDelete, apiGet, apiPost } from '@/lib/api'
 
-import type { FetchPostsParams, Post, PostVersion } from '@/types'
+import type { FetchPostsParams, Post, PostTagChange } from '@/types'
 
 
 export const fetchPosts = async (
     { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
-      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams,
+      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams
 ): Promise<{
     posts:  Post[]
     count:  number }> =>
@@ -29,17 +29,14 @@ export const fetchPost = async (id: string): Promise<Post> => await apiGet (`/po
 
 
 export const fetchPostChanges = async (
-    { post, tag, page, limit }: {
+    { id, page, limit }: {
-	post?:  string
+	id?:    string
-	tag?:   string
 	page:   number
 	limit:  number },
 ): Promise<{
-    versions: PostVersion[]
+    changes:  PostTagChange[]
     count:    number }> =>
-	await apiGet ('/posts/versions', { params: { ...(post && { post }),
+	await apiGet ('/posts/changes', { params: { ...(id && { id }), page, limit } })
-						     ...(tag && { tag }),
-						     page, limit } })
 
 
 export const toggleViewedFlg = async (id: string, viewed: boolean): Promise<void> => {

frontend/src/lib/prefetchers.ts

@@ -3,18 +3,17 @@ import { match } from 'path-to-regexp'
 
 import { fetchPost, fetchPosts, fetchPostChanges } from '@/lib/posts'
 import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
-import { fetchTagByName, fetchTag, fetchTagChanges, fetchTags } from '@/lib/tags'
+import { fetchTagByName } from '@/lib/tags'
 import { fetchWikiPage,
 	 fetchWikiPageByTitle,
 	 fetchWikiPages } from '@/lib/wiki'
 
-import type { Category, FetchPostsOrder, FetchTagsOrder } from '@/types'
+import type { FetchPostsOrder } from '@/types'
 
 type Prefetcher = (qc: QueryClient, url: URL) => Promise<void>
 
 const mPost = match<{ id: string }> ('/posts/:id')
 const mWiki = match<{ title: string }> ('/wiki/:title')
-const mTag = match<{ id: string }> ('/tags/:id')
 
 
 const prefetchWikiPagesIndex: Prefetcher = async (qc, url) => {
@@ -122,75 +121,13 @@ const prefetchPostShow: Prefetcher = async (qc, url) => {
 
 
 const prefetchPostChanges: Prefetcher = async (qc, url) => {
-  const id = url.searchParams.get ('id')
-  const tag = url.searchParams.get ('tag')
-  const page = Number (url.searchParams.get ('page') || 1)
-  const limit = Number (url.searchParams.get ('limit') || 20)
-
-  if (tag)
-    {
-      await qc.prefetchQuery ({
-	  queryKey: tagsKeys.show (tag),
-	  queryFn: () => fetchTag (tag) })
-    }
-
-  await qc.prefetchQuery ({
-      queryKey: postsKeys.changes ({ ...(id && { id }),
-				     ...(tag && { tag }),
-				     page, limit }),
-      queryFn:  () => fetchPostChanges ({ ...(id && { id }),
-					  ...(tag && { tag }),
-					  page, limit }) })
-}
-
-
-const prefetchTagsIndex: Prefetcher = async (qc, url) => {
-  const postRaw = url.searchParams.get ('post')
-  const post = postRaw ? Number (postRaw) : null
-  const name = url.searchParams.get ('name') ?? ''
-  const category = (url.searchParams.get ('category') || null) as Category | null
-  const postCountGTE = Number (url.searchParams.get ('post_count_gte') || 1)
-  const postCountLTERaw = url.searchParams.get ('post_count_lte')
-  const postCountLTE = postCountLTERaw ? Number (postCountLTERaw) : null
-  const createdFrom = url.searchParams.get ('created_from') ?? ''
-  const createdTo = url.searchParams.get ('created_to') ?? ''
-  const updatedFrom = url.searchParams.get ('updated_from') ?? ''
-  const updatedTo = url.searchParams.get ('updated_to') ?? ''
-  const page = Number (url.searchParams.get ('page') || 1)
-  const limit = Number (url.searchParams.get ('limit') || 20)
-  const order = (url.searchParams.get ('order') ?? 'post_count:desc') as FetchTagsOrder
-
-  const keys = {
-      post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
-      updatedFrom, updatedTo, page, limit, order }
-
-  await qc.prefetchQuery ({
-      queryKey: tagsKeys.index (keys),
-      queryFn:  () => fetchTags (keys) })
-}
-
-
-const prefetchTagShow: Prefetcher = async (qc, url) => {
-  const m = mTag (url.pathname)
-  if (!(m))
-    return
-
-  const { id } = m.params
-
-  await qc.prefetchQuery ({
-      queryKey: tagsKeys.show (id),
-      queryFn:  () => fetchTag (id) })
-}
-
-
-const prefetchTagChanges: Prefetcher = async (qc, url) => {
   const id = url.searchParams.get ('id')
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
 
   await qc.prefetchQuery ({
-      queryKey: tagsKeys.changes ({ ...(id && { id }), page, limit }),
+      queryKey: postsKeys.changes ({ ...(id && { id }), page, limit }),
-      queryFn: () => fetchTagChanges ({ ...(id && { id }), page, limit }) })
+      queryFn:  () => fetchPostChanges ({ ...(id && { id }), page, limit }) })
 }
 
 
@@ -204,12 +141,7 @@ export const routePrefetchers: { test: (u: URL) => boolean; run: Prefetcher }[]
     { test: u => u.pathname === '/wiki', run: prefetchWikiPagesIndex },
     { test: u => (!(['/wiki/new', '/wiki/changes'].includes (u.pathname))
 		  && Boolean (mWiki (u.pathname))),
-      run: prefetchWikiPageShow },
+      run: prefetchWikiPageShow }]
-    { test: u => u.pathname === '/tags', run: prefetchTagsIndex },
-    { test: u => (!(['/tags/nico', '/tags/changes'].includes (u.pathname))
-		  && Boolean (mTag (u.pathname))),
-      run: prefetchTagShow },
-    { test: u => u.pathname === '/tags/changes', run: prefetchTagChanges }]
 
 
 export const prefetchForURL = async (qc: QueryClient, urlLike: string): Promise<void> => {