#351

2026-05-23 07:21:15 +09:00 · 2026-05-23 03:50:54 +09:00 · 2026-05-22 03:29:18 +09:00
35 changed files with 359 additions and 301 deletions
@@ -1,7 +1,4 @@
 class ApplicationController < ActionController::API
-  rescue_from ActiveRecord::RecordInvalid, with: :render_record_invalid
-  rescue_from ActiveRecord::RecordNotUnique, with: :render_record_not_unique
-
  before_action :reject_banned_ip_address!
  before_action :authenticate_user
  before_action :reject_banned_user!
@@ -28,42 +25,6 @@ class ApplicationController < ActionController::API
    end
  end

-  def render_bad_request message = 'リクエストが不正です．', field: nil, code: :bad_request
-    render_error(:bad_request, message, field:, code:)
-  end
-
-  def render_unprocessable_entity message = '入力を確認してください．', field: nil, code: :invalid
-    render_error(:unprocessable_entity, message, field:, code:)
-  end
-
-  def render_error status, message, field: nil, code: status
-    error = { code: code.to_s, message: }
-    error[:field] = field.to_s if field.present?
-
-    render json: { errors: [error] }, status:
-  end
-
-  def render_model_errors record, status: :unprocessable_entity
-    errors =
-        record.errors.map do |error|
-          { code: error.type.to_s,
-            field: error.attribute.to_s,
-            message: error.full_message }
-        end
-
-    errors = [{ code: 'invalid', message: '入力を確認してください．' }] if errors.empty?
-
-    render json: { errors: }, status:
-  end
-
-  def render_record_invalid error
-    render_model_errors(error.record)
-  end
-
-  def render_record_not_unique _error = nil
-    render_unprocessable_entity('既に存在してゐます．', code: :taken)
-  end
-
  def reject_banned_ip_address!
    ip_address = IpAddress.find_by(ip_address: IPAddr.new(request.remote_ip).hton)
    return unless ip_address&.banned?
@@ -76,28 +37,4 @@ class ApplicationController < ActionController::API

    head :forbidden
  end
-
-  def render_validation_error record = nil, fields: { }, base: []
-    errors = { }
-
-    if record
-      record.errors.messages.each do |attr, messages|
-        errors[attr] ||= []
-        errors[attr].concat(messages)
-      end
-    end
-
-    fields.each do |attr, messages|
-      errors[attr] ||= []
-      errors[attr].concat(Array(messages))
-    end
-
-    base_errors = Array(base) - Array(errors.delete(:base))
-
-    render json: { type: 'validation_error',
-                   message: '入力内容を確認してください．',
-                   errors:,
-                   base_errors: },
-           status: :unprocessable_entity
-  end
 end
@@ -2,8 +2,7 @@ class DeerjikistsController < ApplicationController
  def show
    platform = params[:platform].to_s.strip
    code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．', field: :platform) if platform.blank?
-    return render_bad_request('code は必須です．', field: :code) if code.blank?
+    return head :bad_request if platform.blank? || code.blank?

    deerjikist = Deerjikist
                 .joins(:tag)
@@ -23,9 +22,7 @@ class DeerjikistsController < ApplicationController
    platform = params[:platform].to_s.strip
    code = params[:code].to_s.strip
    tag_id = params[:tag_id].to_i
-    return render_bad_request('platform は必須です．', field: :platform) if platform.blank?
-    return render_bad_request('code は必須です．', field: :code) if code.blank?
-    return render_bad_request('tag_id が不正です．', field: :tag_id) if tag_id <= 0
+    return head :bad_request if platform.blank? || code.blank? || tag_id <= 0

    deerjikist = Deerjikist.find_or_initialize_by(platform:, code:).tap do |d|
      d.tag_id = tag_id
@@ -41,8 +38,7 @@ class DeerjikistsController < ApplicationController

    platform = params[:platform].to_s.strip
    code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．', field: :platform) if platform.blank?
-    return render_bad_request('code は必須です．', field: :code) if code.blank?
+    return head :bad_request if platform.blank? || code.blank?

    Deerjikist.find([platform, code]).destroy!

@@ -40,8 +40,7 @@ class MaterialsController < ApplicationController
    tag_name_raw = params[:tag].to_s.strip
    file = params[:file]
    url = params[:url].to_s.strip.presence
-    return render_bad_request('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    return render_bad_request('ファイルまたは URL は必須です．') if file.blank? && url.blank?
+    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
@@ -55,7 +54,7 @@ class MaterialsController < ApplicationController
    if material.save
      render json: MaterialRepr.base(material, host: request.base_url), status: :created
    else
-      render_model_errors(material)
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
    end
  end

@@ -69,8 +68,7 @@ class MaterialsController < ApplicationController
    tag_name_raw = params[:tag].to_s.strip
    file = params[:file]
    url = params[:url].to_s.strip.presence
-    return render_bad_request('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    return render_bad_request('ファイルまたは URL は必須です．') if file.blank? && url.blank?
+    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
@@ -86,7 +84,7 @@ class MaterialsController < ApplicationController
    if material.save
      render json: MaterialRepr.base(material, host: request.base_url)
    else
-      render_model_errors(material)
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
    end
  end

@@ -30,14 +30,12 @@ class NicoTagsController < ApplicationController
    id = params[:id].to_i

    tag = Tag.find(id)
-    return render_bad_request('ニコニコ・タグを指定してください．', field: :id) unless tag.nico?
+    return head :bad_request unless tag.nico?

    linked_tag_names = params[:tags].to_s.split
    linked_tags = Tag.normalise_tags!(linked_tag_names, with_tagme: false,
                                                        with_no_deerjikist: false)
-    if linked_tags.any? { |t| t.nico? }
-      return render_bad_request('ニコニコ・タグ同士は連携できません．', field: :tags)
-    end
+    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)
@@ -95,9 +95,10 @@ class PostsController < ApplicationController
  end

  def random
-    post = filtered_posts.preload(tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-                         .order('RAND()')
-                         .first
+    post = filtered_posts
+           .preload(tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+           .order('RAND()')
+           .first
    return head :not_found unless post

    render json: PostRepr.base(post, current_user)
@@ -108,7 +109,7 @@ class PostsController < ApplicationController
    return head :not_found unless post

    render json: PostRepr.base(post, current_user)
-                         .merge(tags: build_tag_tree_for(post.tags),
+                         .merge(tags: build_tag_tree_for(post),
                                related: PostRepr.many(post.related(limit: 20)))
  end

@@ -132,11 +133,11 @@ class PostsController < ApplicationController
    ApplicationRecord.transaction do
      post.save!

-      tags = Tag.normalise_tags!(tag_names)
+      Tag.normalise_tags!(tag_names, with_sections: true) => { tags:, sections: }
      TagVersioning.record_tag_snapshots!(tags, created_by_user: current_user)

      tags = Tag.expand_parent_tags(tags)
-      sync_post_tags!(post, tags)
+      sync_post_tags!(post, tags, sections)

      sync_parent_posts!(post, parent_post_ids)

@@ -148,11 +149,11 @@ class PostsController < ApplicationController
    post.reload
    render json: PostRepr.base(post), status: :created
  rescue Tag::NicoTagNormalisationError
-    render_bad_request('ニコニコ・タグは直接指定できません．', field: :tags)
+    head :bad_request
  rescue ArgumentError => e
-    render_unprocessable_entity(e.message)
+    render json: { errors: [e.message] }, status: :unprocessable_entity
  rescue ActiveRecord::RecordInvalid => e
-    render_model_errors(e.record)
+    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
  end

  def viewed
@@ -175,10 +176,10 @@ class PostsController < ApplicationController

    force = bool?(:force)
    merge = bool?(:merge)
-    return render_bad_request('force と merge は同時に指定できません．') if force && merge
+    return head :bad_request if force && merge

    base_version_no = parse_base_version_no
-    return render_bad_request('base_version_no は必須です．', field: :base_version_no) if !(force) && !(base_version_no)
+    return head :bad_request if !(force) && !(base_version_no)

    title = params[:title].presence
    tag_names = params[:tags].to_s.split
@@ -235,14 +236,14 @@ class PostsController < ApplicationController

    post.reload
    json = PostRepr.base(post, current_user)
-    json['tags'] = build_tag_tree_for(post.tags)
+    json['tags'] = build_tag_tree_for(post)
    render json:, status: :ok
  rescue Tag::NicoTagNormalisationError
-    render_bad_request('ニコニコ・タグは直接指定できません．', field: :tags)
+    head :bad_request
  rescue ArgumentError => e
-    render_validation_error(fields: { parent_post_ids: [e.message] })
+    render json: { errors: [e.message] }, status: :unprocessable_entity
  rescue ActiveRecord::RecordInvalid => e
-    render_validation_error(e.record)
+    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
  end

  def changes
@@ -337,7 +338,7 @@ class PostsController < ApplicationController
  def tagged_post_ids_for(name) =
      Post.joins(tags: :tag_name).where(tag_names: { name: }).select(:id)

-  def sync_post_tags! post, desired_tags
+  def sync_post_tags! post, desired_tags, sections
    desired_tags.each do |t|
      t.save! if t.new_record?
    end
@@ -356,13 +357,20 @@ class PostsController < ApplicationController
      end
    end

+    PostTagSection.where(post_id: post.id).destroy_all
+    sections.each do |tag_id, ranges|
+      ranges.each do |begin_ms, end_ms|
+        PostTagSection.create!(post_id: post.id, tag_id:, begin_ms:, end_ms:)
+      end
+    end
+
    PostTag.where(post_id: post.id, tag_id: to_remove.to_a).kept.find_each do |pt|
      pt.discard_by!(current_user)
    end
  end

-  def build_tag_tree_for tags
-    tags = tags.to_a
+  def build_tag_tree_for post
+    tags = post.tags.to_a
    tag_ids = tags.map(&:id)

    implications = TagImplication.where(parent_tag_id: tag_ids, tag_id: tag_ids)
@@ -384,8 +392,11 @@ class PostsController < ApplicationController
      tag = tags_by_id[tag_id]
      return nil unless tag

+      sections = PostTagSection.where(post_id: post.id, tag_id:)
+                 .as_json(only: [:begin_ms, :end_ms])
+
      if path.include?(tag_id)
-        return TagRepr.base(tag).merge(children: [])
+        return TagRepr.base(tag).merge(children: [], sections:)
      end

      if memo.key?(tag_id)
@@ -397,7 +408,7 @@ class PostsController < ApplicationController

      children = child_ids.filter_map { |cid| build_node.(cid, new_path) }

-      memo[tag_id] = TagRepr.base(tag).merge(children:)
+      memo[tag_id] = TagRepr.base(tag).merge(children:, sections:)
    end

    root_ids.filter_map { |id| build_node.call(id, []) }
@@ -408,7 +419,7 @@ class PostsController < ApplicationController

    params[:parent_post_ids].to_s.split.map { |token|
      id = Integer(token, exception: false)
-      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if id.nil? || id <= 0
+      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if !(id) || id <= 0

      id
    }.uniq
@@ -416,7 +427,7 @@ class PostsController < ApplicationController

  def sync_parent_posts! post, parent_post_ids
    if parent_post_ids.include?(post.id)
-      post.errors.add(:parent_post_ids, '自分自身を親投稿にはできません．')
+      post.errors.add(:base, '自分自身を親投稿にはできません．')
      raise ActiveRecord::RecordInvalid, post
    end

@@ -470,7 +481,21 @@ class PostsController < ApplicationController
  end

  def editable_tag_names_from_post post
-    post.tags.not_nico.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
+    post
+        .post_tags
+        .kept
+        .joins(tag: :tag_name)
+        .merge(Tag.not_nico)
+        .includes(:sections, tag: :tag_name)
+        .order('tag_names.name')
+        .map do |post_tag|
+      name = post_tag.tag.tag_name.name
+      sections = post_tag.sections.sort_by(&:begin_ms)
+
+      next name if sections.empty?
+
+      "#{ name }#{ sections.map { Post.section_literal(_1) }.join }"
+    end
  end

  def post_incoming_snapshot title:, original_created_from:, original_created_before:,
@@ -502,9 +527,16 @@ class PostsController < ApplicationController
  end

  def incoming_tag_names_for_snapshot raw_tag_names
-    tags = Tag.normalise_tags!(raw_tag_names, with_tagme: false)
+    Tag.normalise_tags!(raw_tag_names, with_tagme: false, with_sections: true) =>
+        { tags:, sections: }

-    Tag.expand_parent_tags(tags).map(&:name).uniq.sort
+    Tag.expand_parent_tags(tags).uniq(&:id).map { |tag|
+      "#{ tag.name }#{ sections[tag.id].to_a.map { section_literal(_1) }.join }"
+    }.sort
+  end
+
+  def section_literal section
+    "[#{ Post.ms_to_time(section[0]) }-#{ Post.ms_to_time(section[1]) }]"
  end

  def post_conflict_json post:, base_version_no:, base_snapshot:,
@@ -591,7 +623,8 @@ class PostsController < ApplicationController
                 original_created_from: snapshot[:original_created_from],
                 original_created_before: snapshot[:original_created_before])

-    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false)
+    Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false, with_sections: true) =>
+        { tags: editable_tags, sections: }
    TagVersioning.record_tag_snapshots!(editable_tags, created_by_user: current_user)

    readonly_tags = post.tags.nico.to_a
@@ -599,7 +632,7 @@ class PostsController < ApplicationController
    tags = readonly_tags + editable_tags
    tags = Tag.expand_parent_tags(tags)

-    sync_post_tags!(post, tags)
+    sync_post_tags!(post, tags, sections)
    sync_parent_posts!(post, snapshot[:parent_post_ids])

    PostVersionRecorder.record!(post:, event_type: :update, created_by_user: current_user)
@@ -4,7 +4,7 @@ class PreviewController < ApplicationController
    return head :unauthorized unless current_user

    url = params[:url]
-    return render_bad_request('URL は必須です．', field: :url) unless url.present?
+    return head :bad_request unless url.present?

    unless url.start_with?(/http(s)?:\/\//)
      url = 'http://' + url
@@ -16,7 +16,7 @@ class PreviewController < ApplicationController

    render json: { title: title }
  rescue => e
-    render_bad_request(e.message, field: :url)
+    render json: { error: e.message }, status: :bad_request
  end

  def thumbnail
@@ -25,7 +25,7 @@ class PreviewController < ApplicationController
    return head :unauthorized unless current_user

    url = params[:url]
-    return render_bad_request('URL は必須です．', field: :url) if url.blank?
+    return head :bad_request if url.blank?

    unless url.start_with?(/http(s)?:\/\//)
      url = 'http://' + url
@@ -40,8 +40,7 @@ class PreviewController < ApplicationController
      File.delete(path) rescue nil
      send_file image.path, type: 'image/png', disposition: 'inline'
    else
-      render_error(:internal_server_error, 'サムネールを生成できませんでした．',
-                   code: :thumbnail_generation_failed)
+      render json: { error: 'Failed to generate thumbnail' }, status: :internal_server_error
    end
  end
 end
@@ -5,12 +5,11 @@ class TagChildrenController < ApplicationController

    parent_id = params[:parent_id]
    child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．', field: :parent_id) if parent_id.blank?
-    return render_bad_request('child_id は必須です．', field: :child_id) if child_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?

    parent = Tag.find(parent_id)
    child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
+    return head :bad_request if parent.nico? || child.nico?

    ApplicationRecord.transaction do
      TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
@@ -28,12 +27,11 @@ class TagChildrenController < ApplicationController

    parent_id = params[:parent_id]
    child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．', field: :parent_id) if parent_id.blank?
-    return render_bad_request('child_id は必須です．', field: :child_id) if child_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?

    parent = Tag.find(parent_id)
    child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
+    return head :bad_request if parent.nico? || child.nico?

    ApplicationRecord.transaction do
      TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
@@ -168,7 +168,7 @@ class TagsController < ApplicationController

  def show_by_name
    name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?

    tag = Tag.joins(:tag_name)
             .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -192,7 +192,7 @@ class TagsController < ApplicationController

  def deerjikists_by_name
    name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?

    tag = Tag.joins(:tag_name)
             .includes(:tag_name, tag_name: :wiki_page)
@@ -228,7 +228,7 @@ class TagsController < ApplicationController

  def materials_by_name
    name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?

    tag = Tag.joins(:tag_name)
             .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -247,16 +247,17 @@ class TagsController < ApplicationController

    name = params[:name].to_s.strip
    category = params[:category].to_s.strip
-    return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
-    return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
+    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_unprocessable_entity('システム・タグの名称は変更できません．', field: :name)
+      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_unprocessable_entity('ニコタグは変更できません．', field: :category)
+      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
@@ -301,7 +302,8 @@ class TagsController < ApplicationController
    tag = Tag.find(params[:id])

    if tag.nico? || (category.present? && category == 'nico')
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
+      return render json: { error: 'ニコタグは変更できません．' },
+                    status: :unprocessable_entity
    end

    ApplicationRecord.transaction do
@@ -15,7 +15,7 @@ class TheatreCommentsController < ApplicationController
    return head :unauthorized unless current_user

    content = params[:content]
-    return render_unprocessable_entity('本文は必須です．', field: :content) if content.blank?
+    return head :unprocessable_entity if content.blank?

    theatre = Theatre.find_by(id: params[:theatre_id])
    return head :not_found unless theatre
@@ -42,12 +42,12 @@ class UsersController < ApplicationController
    return head :unauthorized if user&.id != params[:id].to_i

    name = params[:name]
-    return render_bad_request('名前は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?

    if user.update(name:)
      render json: user.slice(:id, :name, :inheritance_code, :role), status: :ok
    else
-      render_model_errors(user)
+      render json: user.errors, status: :unprocessable_entity
    end
  end

@@ -46,7 +46,7 @@ class WikiPagesController < ApplicationController

  def diff
    id = params[:id]
-    return render_bad_request('id は必須です．', field: :id) if id.blank?
+    return head :bad_request if id.blank?

    from = params[:from].presence
    to = params[:to].presence
@@ -56,7 +56,7 @@ class WikiPagesController < ApplicationController
    from_rev = from && page.wiki_revisions.find(from)
    to_rev = to ? page.wiki_revisions.find(to) : page.current_revision
    if ((from_rev && !(from_rev.content?)) || !(to_rev&.content?))
-      return render_unprocessable_entity('差分を表示できない版です．')
+      return head :unprocessable_entity
    end

    diffs = Diff::LCS.sdiff(from_rev&.body&.lines || [], to_rev.body.lines)
@@ -89,8 +89,7 @@ class WikiPagesController < ApplicationController
    body = params[:body].to_s
    message = params[:message].presence

-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?

    tag_name = TagName.find_undiscard_or_create_by!(name: title)

@@ -102,10 +101,8 @@ class WikiPagesController < ApplicationController
            message:)

    render json: WikiPageRepr.base(page), status: :created
-  rescue ActiveRecord::RecordInvalid => e
-    render_model_errors(e.record)
-  rescue ActiveRecord::RecordNotUnique
-    render_record_not_unique
+  rescue ActiveRecord::RecordInvalid, ActiveRecord::RecordNotUnique
+    head :unprocessable_entity
  end

  def update
@@ -115,8 +112,7 @@ class WikiPagesController < ApplicationController
    title = params[:title]&.strip
    body = params[:body].to_s

-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?

    page = WikiPage.find(params[:id])
    base_revision_id = params[:base_revision_id].presence
@@ -56,7 +56,38 @@ 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 snapshot_tag_names
+    post_tags
+        .kept
+        .joins(tag: :tag_name)
+        .includes(:sections, tag: :tag_name)
+        .order('tag_names.name')
+        .map do |post_tag|
+      name = post_tag.tag.tag_name.name
+      sections = post_tag.sections.sort_by(&:begin_ms)
+
+      next name if sections.empty?
+
+      "#{ name }#{ sections.map { Post.section_literal(_1) }.join }"
+    end
+  end
+
+  def self.section_literal section
+    "[#{ Post.ms_to_time(section.begin_ms) }-#{ Post.ms_to_time(section.end_ms) }]"
+  end
+
+  def self.ms_to_time ms
+    total_s = ms / 1_000
+    s = total_s % 60
+    min = (total_s / 60) % 60
+    h = total_s / 3_600
+
+    if h.positive?
+      '%d:%02d:%02d' % [h, min, s]
+    else
+      '%d:%02d' % [min, s]
+    end
+  end

  def snapshot_parent_post_ids = parents.order(:id).pluck(:id)

@@ -10,6 +10,12 @@ class PostTag < ApplicationRecord
  belongs_to :created_user, class_name: 'User', optional: true
  belongs_to :deleted_user, class_name: 'User', optional: true

+  has_many :sections, -> { order(:begin_ms) }, class_name: 'PostTagSection',
+                                               foreign_key: [:post_id, :tag_id],
+                                               primary_key: [:post_id, :tag_id],
+                                               dependent: :delete_all,
+                                               inverse_of: :post_tag
+
  validates :post_id, presence: true
  validates :tag_id, presence: true
  validates :post_id, uniqueness: {
@@ -0,0 +1,20 @@
+class PostTagSection < ApplicationRecord
+  self.primary_key = :post_id, :tag_id, :begin_ms
+
+  belongs_to :post
+  belongs_to :tag
+
+  belongs_to :post_tag, -> { kept }, foreign_key: [:post_id, :tag_id],
+                                     primary_key: [:post_id, :tag_id],
+                                     inverse_of: :sections,
+                                     optional: true
+
+  validates :post_id, presence: true
+  validates :tag_id, presence: true
+
+  validates :begin_ms, presence: true,
+                       numericality: { only_integer: true, greater_than_or_equal_to: 0 }
+
+  validates :end_ms, presence: true,
+                     numericality: { only_integer: true, greater_than: :begin_ms }
+end
@@ -92,22 +92,50 @@ class Tag < ApplicationRecord

  def self.normalise_tags! tag_names, with_tagme: true,
                                      with_no_deerjikist: true,
-                                      deny_nico: true
+                                      deny_nico: true,
+                                      with_sections: false
    if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
      raise NicoTagNormalisationError
    end

+    sections = { }
    tags = tag_names.map do |name|
      pf, cat = CATEGORY_PREFIXES.find { |p, _| name.downcase.start_with?(p) } || ['', nil]
-      name = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
+
+      name = name.sub(/\A#{ pf }/i, '')
+
+      sections_by_tag = []
+      while n = name.sub!(/^(\S*?)\[([0-9:.]*?)-([0-9:.]*?)\](\S*?)$/, '\1\4 \2 \3')
+        name, *section_raw = n.split
+
+        begin_ms, end_ms = section_raw.map { time_to_ms(_1) }
+        next if begin_ms == end_ms
+
+        begin_ms, end_ms = end_ms, begin_ms if begin_ms > end_ms
+
+        sections_by_tag << [begin_ms, end_ms]
+      end
+
+      name = TagName.canonicalise(name).first
+
      find_or_create_by_tag_name!(name, category: (cat || :general)).tap do |tag|
        tag.update!(category: cat) if cat && tag.category != cat
+        next if sections_by_tag.empty?
+
+        sections[tag.id] ||= []
+        sections[tag.id].concat(sections_by_tag)
      end
    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.uniq(&:id)
+    tags.uniq!(&:id)
+
+    if with_sections
+      { tags:, sections: }
+    else
+      tags
+    end
  end

  def self.expand_parent_tags tags
@@ -228,4 +256,23 @@ class Tag < ApplicationRecord
      errors.add :category, 'ニジラーと紐づいてゐるタグはニジラー・カテゴリである必要があります．'
    end
  end
+
+  def self.time_to_ms str
+    parts = str.split(':')
+
+    s_part = parts.pop
+    s, ms = s_part.split('.')
+
+    total_s = s.to_i
+
+    if parts.length >= 1
+      total_s += parts.pop.to_i * 60
+    end
+
+    if parts.length >= 1
+      total_s += parts.pop.to_i * 3_600
+    end
+
+    total_s * 1_000 + ms.to_s.ljust(3, '0')[0, 3].to_i
+  end
 end
@@ -0,0 +1,19 @@
+class CreatePostTagSections < ActiveRecord::Migration[8.0]
+  def change
+    create_table :post_tag_sections, primary_key: [:post_id, :tag_id, :begin_ms] do |t|
+      t.references :post, null: false, foreign_key: true, index: false
+      t.references :tag, null: false, foreign_key: true, index: false
+      t.integer :begin_ms, null: false
+      t.integer :end_ms, null: false
+      t.timestamps
+
+      t.index [:post_id, :begin_ms], name: 'idx_post_tag_sections_post_id_begin_ms'
+
+      t.check_constraint 'begin_ms >= 0',
+                         name: 'chk_post_tag_sections_begin_ms_natural'
+
+      t.check_constraint 'begin_ms < end_ms',
+                         name: 'chk_post_tag_sections_end_ms_after_begin_ms'
+    end
+  end
+end
@@ -0,0 +1,9 @@
+class AddVideoMsToPosts < ActiveRecord::Migration[8.0]
+  def change
+    add_column :posts, :video_ms, :integer
+    add_index :posts, [:video_ms, :id], name: 'idx_posts_video_ms_id'
+
+    add_check_constraint :posts, 'video_ms IS NULL OR video_ms > 0',
+                         name: 'chk_posts_video_ms_positive'
+  end
+end
@@ -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_05_07_213300) do
+ActiveRecord::Schema[8.0].define(version: 2026_05_19_013100) 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
@@ -137,6 +137,19 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_07_213300) do
    t.index ["target_post_id"], name: "index_post_similarities_on_target_post_id"
  end

+  create_table "post_tag_sections", primary_key: ["post_id", "tag_id", "begin_ms"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "post_id", null: false
+    t.bigint "tag_id", null: false
+    t.integer "begin_ms", null: false
+    t.integer "end_ms", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["post_id", "begin_ms"], name: "idx_post_tag_sections_post_id_begin_ms"
+    t.index ["tag_id"], name: "fk_rails_8be3847903"
+    t.check_constraint "`begin_ms` < `end_ms`", name: "chk_post_tag_sections_end_ms_after_begin_ms"
+    t.check_constraint "`begin_ms` >= 0", name: "chk_post_tag_sections_begin_ms_natural"
+  end
+
  create_table "post_tags", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
    t.bigint "post_id", null: false
    t.bigint "tag_id", null: false
@@ -187,8 +200,11 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_07_213300) do
    t.datetime "original_created_before"
    t.datetime "updated_at", null: false
    t.integer "version_no", null: false
+    t.integer "video_ms"
    t.index ["uploaded_user_id"], name: "index_posts_on_uploaded_user_id"
    t.index ["url"], name: "index_posts_on_url", unique: true
+    t.index ["video_ms", "id"], name: "idx_posts_video_ms_id"
+    t.check_constraint "(`video_ms` is null) or (`video_ms` > 0)", name: "chk_posts_video_ms_positive"
    t.check_constraint "`version_no` > 0", name: "chk_posts_version_no_positive"
  end

@@ -290,6 +306,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_07_213300) do
    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: "idx_on_theatre_id_skip_expires_at_4c8de1dd42"
    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"
@@ -446,6 +463,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_05_07_213300) do
  add_foreign_key "post_implications", "posts", column: "parent_post_id"
  add_foreign_key "post_similarities", "posts"
  add_foreign_key "post_similarities", "posts", column: "target_post_id"
+  add_foreign_key "post_tag_sections", "posts"
+  add_foreign_key "post_tag_sections", "tags"
  add_foreign_key "post_tags", "posts"
  add_foreign_key "post_tags", "tags"
  add_foreign_key "post_tags", "users", column: "created_user_id"
@@ -0,0 +1,8 @@
+FactoryBot.define do
+  factory :post_tag_section do
+    association :post
+    association :tag
+    begin_ms { 1_000 }
+    end_ms { 2_000 }
+  end
+end
@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :post_tag do
+    association :post
+    association :tag
+  end
+end
@@ -0,0 +1,8 @@
+FactoryBot.define do
+  factory :post do
+    sequence(:url) { |n| "https://example.com/factory-post-#{ n }" }
+    title { 'factory post' }
+    thumbnail_base { nil }
+    uploaded_user { nil }
+  end
+end
@@ -0,0 +1,29 @@
+RSpec.describe PostTag, type: :model do
+  describe '#sections' do
+    it 'loads sections by post_id and tag_id' do
+      post_tag = create(:post_tag)
+      section = create(:post_tag_section,
+                       post: post_tag.post,
+                       tag: post_tag.tag,
+                       begin_ms: 1000,
+                       end_ms: 2000)
+
+      expect(post_tag.sections).to contain_exactly(section)
+    end
+
+    it 'does not load sections for another tag on the same post' do
+      post = create(:post)
+      tag = create(:tag)
+      other_tag = create(:tag)
+
+      post_tag = create(:post_tag, post:, tag:)
+      create(:post_tag_section,
+             post:,
+             tag: other_tag,
+             begin_ms: 1000,
+             end_ms: 2000)
+
+      expect(post_tag.sections).to be_empty
+    end
+  end
+end
@@ -1,47 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'error responses', type: :request do
-  describe 'manual input errors' do
-    it 'returns a stable errors array for bad requests' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: '   ' }
-
-      expect(response).to have_http_status(:bad_request)
-      expect(json.fetch('errors')).to contain_exactly(
-          include('code' => 'bad_request',
-                  'field' => 'name',
-                  'message' => be_present))
-    end
-
-    it 'returns a stable errors array for unprocessable requests' do
-      member = create(:user, :member)
-      tag = create(:tag, :general, name: 'error_response_tag')
-      sign_in_as(member)
-
-      patch "/tags/#{ tag.id }", params: { category: 'nico' }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to contain_exactly(
-          include('code' => 'invalid',
-                  'field' => 'category',
-                  'message' => be_present))
-    end
-  end
-
-  describe 'model validation errors' do
-    it 'returns field, code, and message for model errors' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: 'a' * 256 }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          include('code' => 'too_long',
-                  'field' => 'name',
-                  'message' => be_present))
-    end
-  end
-end
@@ -2,36 +2,34 @@ import { useEffect, useState } from 'react'

 import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
-import FieldError from '@/components/common/FieldError'
 import Label from '@/components/common/Label'
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { isApiError } from '@/lib/api'
-import { extractValidationError } from '@/lib/apiErrors'
 import { updatePost } from '@/lib/posts'
+import { msToTime } from '@/lib/utils'

 import type { FC, FormEvent } from 'react'

-import type { FieldErrors } from '@/lib/apiErrors'
-import type { Post, Tag } from '@/types'
-
-type PostFormField =
-    'parentPostId' | 'tags' | 'originalCreatedFrom' | 'originalCreatedBefore'
+import type { Post, TagWithSections } from '@/types'


-const tagsToStr = (tags: Tag[]): string => {
-  const result: Tag[] = []
+const tagsToStr = (tags: TagWithSections[]): string => {
+  const result: Omit<TagWithSections, 'children'>[] = []

-  const walk = (tag: Tag) => {
+  const walk = (tag: TagWithSections) => {
    const { children, ...rest } = tag
    result.push (rest)
-    children?.forEach (walk)
+    children.forEach (walk)
  }

  tags.filter (t => t.category !== 'nico').forEach (walk)

-  return [...(new Set (result.map (t => t.name)))].join (' ')
+  return [...(new Set (result.map (t =>
+      `${ t.name }${ t.sections
+		     .map (s => `[${ msToTime (s.beginMs) }-${ msToTime (s.endMs) }]`)
+		     .join ('') }`)))].join (' ')
 }


@@ -40,9 +38,7 @@ type Props = { post:    Post


 const PostEditForm: FC<Props> = ({ post, onSave }) => {
-  const [baseErrors, setBaseErrors] = useState<string[]> ([])
  const [disabled, setDisabled] = useState (false)
-  const [fieldErrors, setFieldErrors] = useState<FieldErrors> ({ })
  const [originalCreatedBefore, setOriginalCreatedBefore] =
      useState<string | null> (post.originalCreatedBefore)
  const [originalCreatedFrom, setOriginalCreatedFrom] =
@@ -55,9 +51,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
  const dialogue = useDialogue ()

  const update = async (...args: Parameters<typeof updatePost>) => {
-    setFieldErrors ({ })
-    setBaseErrors ([])
-
    try
    {
      const data = await updatePost (...args)
@@ -78,18 +71,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {

      if (response?.status !== 409)
 	{
-	  const validationError = extractValidationError (e)
-
-	  if (validationError)
-	    {
-	      setFieldErrors (validationError.fieldErrors)
-	      setBaseErrors (validationError.baseErrors)
-	      toast ({ description: '更新はできなかったよ……' })
-	      return
-	    }
-
-	  toast ({ title: '失敗……', description: '入力を確認してください．' })
-
+	  toast ({ description: '更新はできなかったよ……' })
 	  return
 	}

@@ -139,7 +121,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
  }

  useEffect (() => {
-    setTags(tagsToStr (post.tags))
+    setTags (tagsToStr (post.tags))
  }, [post])

  return (
@@ -164,15 +146,13 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	      value={parentPostIds}
 	      onChange={e => setParentPostIds (e.target.value)}
 	      className="w-full border p-2 rounded"/>
-	  <FieldError messages={fieldErrors.url}/>
 	</div>

 	{/* タグ */}
 	<PostFormTagsArea
 	    disabled={disabled}
 	    tags={tags}
-	    setTags={setTags}
-	    errors={fieldErrors.tags}/>
+	    setTags={setTags}/>

 	{/* オリジナルの作成日時 */}
 	<PostOriginalCreatedTimeField
@@ -180,9 +160,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	    originalCreatedFrom={originalCreatedFrom}
 	    setOriginalCreatedFrom={setOriginalCreatedFrom}
 	    originalCreatedBefore={originalCreatedBefore}
-	    setOriginalCreatedBefore={setOriginalCreatedBefore}
-	    fromErrors={fieldErrors.originalCreatedFrom}
-	    beforeErrors={fieldErrors.originalCreatedBefore}/>
+	    setOriginalCreatedBefore={setOriginalCreatedBefore}/>

 	{/* 送信 */}
 	<Button
@@ -3,7 +3,6 @@
 import { useRef, useState } from 'react'

 import TagSearchBox from '@/components/TagSearchBox'
-import FieldError from '@/components/common/FieldError'
 import Label from '@/components/common/Label'
 import TextArea from '@/components/common/TextArea'
 import { apiGet } from '@/lib/api'
@@ -34,11 +33,10 @@ const replaceToken = (value: string, start: number, end: number, text: string) =

 type Props = Omit<ComponentPropsWithoutRef<'textarea'>, 'value' | 'onChange' | 'onBlur'> & {
    tags:     string
-    setTags:  (tags: string) => void
-    errors?:  string[] }
+    setTags:  (tags: string) => void }


-const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
+const PostFormTagsArea: FC<Props> = ({ tags, setTags, ...rest }) => {
  const ref = useRef<HTMLTextAreaElement> (null)

  const [bounds, setBounds] = useState<{ start: number; end: number }> ({ start: 0, end: 0 })
@@ -98,7 +96,6 @@ const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
 			     : [] as Tag[]}
 		activeIndex={-1}
 		onSelect={handleTagSelect}/>)}
-	<FieldError messages={errors}/>
      </div>)
 }

@@ -9,9 +9,7 @@ type Props = {
    originalCreatedFrom:      string | null
    setOriginalCreatedFrom:   (x: string | null) => void
    originalCreatedBefore:    string | null
-    setOriginalCreatedBefore: (x: string | null) => void
-    fromErrors?:              string[]
-    beforeErrors?:            string[] }
+    setOriginalCreatedBefore: (x: string | null) => void }


 const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
@@ -21,7 +19,6 @@ const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
 		   setOriginalCreatedBefore }) => (
    <div>
      <Label>オリジナルの作成日時</Label>
-
      <div className="my-1 flex">
 	<div className="w-80">
 	  <DateTimeField
@@ -54,8 +51,6 @@ const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
 	  </Button>
 	</div>
      </div>
-      <FieldError messages={fromErrors}/>
-
      <div className="my-1 flex">
 	<div className="w-80">
 	  <DateTimeField
@@ -76,7 +71,6 @@ const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
 	  </Button>
 	</div>
      </div>
-      <FieldError messages={beforeErrors}/>
    </div>)

 export default PostOriginalCreatedTimeField
@@ -26,13 +26,13 @@ import { dateString, originalCreatedAtString } from '@/lib/utils'
 import type { DragEndEvent } from '@dnd-kit/core'
 import type { FC, MutableRefObject, ReactNode } from 'react'

-import type { Category, Post, Tag } from '@/types'
+import type { Category, Post, TagWithSections } from '@/types'

-type TagByCategory = { [key in Category]: Tag[] }
+type TagByCategory = { [key in Category]: TagWithSections[] }


 const renderTagTree = (
-    tag:              Tag,
+    tag:              TagWithSections,
    nestLevel:        number,
    path:             string,
    suppressClickRef: MutableRefObject<boolean>,
@@ -63,7 +63,7 @@ const renderTagTree = (


 const isDescendant = (
-    root:     Tag,
+    root:     TagWithSections,
    targetId: number,
 ): boolean => {
  if (!(root.children))
@@ -84,8 +84,8 @@ const isDescendant = (
 const findTag = (
    byCat:  TagByCategory,
    id:     number,
-): Tag | undefined => {
-  const walk = (nodes: Tag[]): Tag | undefined => {
+): TagWithSections | undefined => {
+  const walk = (nodes: TagWithSections[]): TagWithSections | undefined => {
    for (const t of nodes)
      {
 	if (t.id === id)
@@ -167,7 +167,7 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
      }

    for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
-      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
+      tagsTmp[cat].sort ((tagA: TagWithSections, tagB: TagWithSections) => tagA.name < tagB.name ? -1 : 1)

    return tagsTmp
  }, [post])
@@ -1,17 +0,0 @@
-import type { FC } from 'react'
-
-type Props = { messages?: string[] }
-
-
-export const FieldError: FC<Props> = ({ messages }: Props) => {
-  if (!(messages?.length))
-    return null
-
-  return (
-      <ul className="mt-1 space-y-1 text-red-600 dark:text-red-400">
-	{messages.map ((message, i) => <li key={i}>{message}</li>)}
-      </ul>)
-}
-
-
-export default FieldError
@@ -1,30 +0,0 @@
-import toCamel from 'camelcase-keys'
-
-import { isApiError } from '@/lib/api'
-
-export type FieldErrors = Partial<Record<string, string[]>>
-
-export type ValidationError = { message:      string
-				fieldErrors:  FieldErrors
-				baseErrors:   string[] }
-
-type RawValidationError = { type?:        string
-			    message?:     string
-			    errors?:      Record<string, string[]>
-			    baseErrors?:  string[] }
-
-
-export const extractValidationError = (err: unknown) => {
-  if (!(isApiError (err)) || err.response?.status !== 422)
-    return null
-
-  const data = toCamel ((err.response.data ?? { }) as Record<string, unknown>,
-			{ deep: true }) as RawValidationError
-
-  if (data.type !== 'validation_error' && !(data.errors))
-    return null
-
-  return { message: data.message ?? '入力内容を確認してください．',
-	   fieldErrors: (data.errors ?? { }) as FieldErrors,
-	   baseErrors: data.baseErrors ?? [] }
-}
@@ -71,3 +71,15 @@ export const originalCreatedAtString = (
 	       .join (' '))
  return rtn === '〜' ? '年月日不詳' : rtn
 }
+
+
+export const msToTime = (ms: number): string => {
+  const totalS = Math.trunc (ms / 1_000)
+  const s = String (totalS % 60)
+  const min = String (Math.trunc (totalS / 60) % 60)
+  const h = Math.trunc (totalS / 3_600)
+
+  return (h > 0
+	  ? `${ h }:${ min.padStart (2, '0') }:${ s.padStart (2, '0') }`
+	  : `${ min }:${ s.padStart (2, '0') }`)
+}
@@ -1,5 +1,6 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { useEffect, useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'

 import TagLink from '@/components/TagLink'
@@ -69,6 +70,11 @@ const DeerjikistDetailPage: FC = () => {

  return (
      <MainArea>
+	<Helmet>
+	  <meta name="robots" content="noindex"/>
+	  {tag && <title>{tag.name} | ニジラー情報</title>}
+	</Helmet>
+
 	{(loading || !(tag)) ? 'Loading...' : (
 	    <div className="max-w-xl">
 	      <PageTitle>
@@ -3,6 +3,7 @@ import { motion } from 'framer-motion'
 import { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
+
 import PostEditForm from '@/components/PostEditForm'
 import PostEmbed from '@/components/PostEmbed'
 import PostList from '@/components/PostList'
@@ -1,6 +1,6 @@
-import type { Material, Post, Tag, User, WikiPage } from '@/types'
+import type { Material, Post, TagWithSections, User, WikiPage } from '@/types'

-export const buildTag = (overrides: Partial<Tag> = {}): Tag => ({
+export const buildTag = (overrides: Partial<TagWithSections> = {}): TagWithSections => ({
  id:             1,
  name:           'テストタグ',
  category:       'general',
@@ -13,6 +13,8 @@ export const buildTag = (overrides: Partial<Tag> = {}): Tag => ({
  materialId:     null,
  hasDeerjikists: false,
  matchedAlias:   null,
+  sections:       [],
+  children:       [],
  ...overrides,
 })

@@ -126,7 +126,7 @@ export type Post = {
    title:                  string | null
    thumbnail:              string | null
    thumbnailBase:          string | null
-    tags:                   Tag[]
+    tags:                   TagWithSections[]
    parentPosts?:           Post[]
    childPosts?:            Post[]
    siblingPosts?:          Record<`${ number }`, Post[]>
@@ -187,7 +187,6 @@ export type Tag = {
    hasWiki:        boolean
    materialId:     number | null
    hasDeerjikists: boolean
-    children?:      Tag[]
    matchedAlias?:  string | null }

 export type TagVersion = {
@@ -201,6 +200,10 @@ export type TagVersion = {
    createdAt:              string
    createdByUser:          { id: number; name: string | null } | null }

+export type TagWithSections = Tag & { sections: { beginMs:  number
+						  endMs:    number }[]
+			              children: TagWithSections[] }
+
 export type Theatre = {
    id:             number
    name:           string | null
Author	SHA1	Message	Date
みてるぞ	7e89fb286a	#351	2026-05-23 07:21:15 +09:00
みてるぞ	7fcfc8b8aa	#351	2026-05-23 03:50:54 +09:00
みてるぞ	7b6b24b9c5	#351	2026-05-22 03:29:18 +09:00