#90

AGENTS.md

@@ -12,21 +12,16 @@ BTRC Hub / タグ広場 is a split Rails API and React frontend repository.
 ## Stack
 
 - Backend: Ruby `3.2.2` from `backend/.ruby-version`, Rails `~> 8.0.2`.
-- Backend dependencies include `mysql2`, `sqlite3`, `rspec-rails`,
-  `factory_bot_rails`, `rack-cors`, `jwt`, `discard`, `gollum`, `whenever`,
-  `aws-sdk-s3`, `brakeman`, and `rubocop-rails-omakase`.
+- Backend dependencies include `mysql2`, `sqlite3`, `rspec-rails`, `factory_bot_rails`, `rack-cors`, `jwt`, `discard`, `gollum`, `whenever`, `aws-sdk-s3`, `brakeman`, and `rubocop-rails-omakase`.
 - Frontend: React `^19.1.0`, TypeScript `~5.8.3`, Vite `^6.3.5`.
-- Frontend data/UI dependencies include Axios, TanStack Query, Tailwind CSS,
-  Framer Motion, Radix UI components, lucide-react, MDX/Markdown tooling, and
-  Zustand.
+- Frontend data/UI dependencies include Axios, TanStack Query, Tailwind CSS, Framer Motion, Radix UI components, lucide-react, MDX/Markdown tooling, and Zustand.
 
 ## Main directories
 
 - `backend/app/controllers`: Rails API controllers.
 - `backend/app/models`: Active Record models.
 - `backend/app/representations`: API response representation classes.
-- `backend/app/services`: domain services such as version recording,
-  wiki commit, YouTube sync, and similarity calculation.
+- `backend/app/services`: domain services such as version recording, wiki commit, YouTube sync, and similarity calculation.
 - `backend/config/routes.rb`: API routes.
 - `backend/db/migrate`: migrations.
 - `backend/db/schema.rb`: current schema snapshot.
@@ -94,8 +89,7 @@ npm run test:run
 npm run preview
 ```
 
-`npm run build` runs `tsc -b && vite build`, then `postbuild` runs
-`node scripts/generate-sitemap.js`.
+`npm run build` runs `tsc -b && vite build`, then `postbuild` runs `node scripts/generate-sitemap.js`.
 
 `npm run test` runs Vitest in watch mode. Use `npm run test:run` for a non-watch frontend test run.
 
@@ -104,91 +98,40 @@ npm run preview
 - Prefer precise, minimal changes.
 - Do not flatter or over-explain.
 - Explain risks directly.
-- Prefer single quotes for strings unless interpolation or escaping makes
-  double quotes better.
+- Prefer single quotes for strings unless interpolation or escaping makes double quotes better.
 - Ruby: never put a space before method-call parentheses.
-- Ruby: never put a line break immediately before `)`.
 - Ruby: do not use `%w` or `%i`.
-- Ruby hashes are not blocks; keep `}` on the same line as the final pair.
-- Ruby hashes keep the first pair on the same line as `{` unless line length
-  requires a break.
-- Ruby blocks use separate `{ ... }` rules from hashes, with 2-space body
-  indentation.
-- For arrays, never put whitespace or a line break immediately before `]`.
-- Keep the first element on the same line as `[` by default.
-- If an array would exceed the line limit, break after `[` and indent
-  elements by 4 spaces.
-- TypeScript and Python: use GNU-style spacing before parentheses where
-  syntactically valid.
-- Never write Ruby, TypeScript, or TSX lines longer than 99 characters.
-- Aim to keep Ruby, TypeScript, and TSX lines within 79 characters where practical.
-- TypeScript and TSX use 4-space logical indentation.
-- In TypeScript and TSX only, replace every leading run of 8 spaces with a tab.
-- Tabs are only for leading indentation, never for spaces after non-space text.
+- TypeScript and Python: use GNU-style spacing before parentheses where syntactically valid.
 - Do not add production dependencies without explicit approval.
-- Do not create, modify, or run tests unless the user explicitly asks for
-  test work. When the user asks for tests, keep working and rerun them until
-  they pass or the remaining failure is clearly blocked.
 
 ## Backend rules
 
-- Inspect existing routes, controllers, models, services, and specs before
-  editing backend behavior.
-- For API behavior changes, add or update request specs under
-  `backend/spec/requests` only when the user explicitly asks for tests.
-- Prefer RSpec for new backend tests; existing minitest files under
-  `backend/test` do not make minitest the default for new coverage.
+- Inspect existing routes, controllers, models, services, and specs before editing backend behavior.
+- For API behavior changes, add or update request specs under `backend/spec/requests`.
+- Prefer RSpec for new backend tests; existing minitest files under `backend/test` do not make minitest the default for new coverage.
 - Do not weaken authentication, BAN user checks, or IP BAN checks.
-- Preserve the `X-Transfer-Code` user identification flow unless the task
-  explicitly changes authentication.
-- Be careful with version tables, `version_no`, optimistic concurrency,
-  wiki revisions, and restore/diff behavior.
+- Preserve the `X-Transfer-Code` user identification flow unless the task explicitly changes authentication.
+- Be careful with version tables, `version_no`, optimistic concurrency, wiki revisions, and restore/diff behavior.
 - Be careful with tag names, tag normalization, implications, similarities, and discard behavior.
-- Be sensitive to N+1 queries; avoid introducing them and proactively fix
-  existing N+1 issues in the code path being edited.
 - Keep migration files and `backend/db/schema.rb` consistent when changing schema.
 
 ## Frontend rules
 
 - Use `frontend/src/lib/api.ts` for API calls so headers and camelCase conversion stay consistent.
-- Add or reuse TanStack Query keys through `frontend/src/lib/queryKeys.ts`;
-  avoid ad hoc query key arrays.
+- Add or reuse TanStack Query keys through `frontend/src/lib/queryKeys.ts`; avoid ad hoc query key arrays.
 - Encode URL path-segment values with `encodeURIComponent`.
 - React hooks must be called unconditionally.
-- Keep page-level code under `frontend/src/pages` and shared UI/feature code
-  under `frontend/src/components` unless existing patterns point elsewhere.
+- Keep page-level code under `frontend/src/pages` and shared UI/feature code under `frontend/src/components` unless existing patterns point elsewhere.
 - Match existing Tailwind, component, and import alias conventions.
-- In TypeScript and TSX, prefer direct comparison operators such as `===` and
-  `!==` over negating a comparison like `!(a === b)`.
-- In TypeScript and TSX, prefer `++i` or `--i` over `i += 1` or `i -= 1` for
-  simple unit-step counter updates.
-- For user-facing Japanese text, prefer modern kana usage and natural current
-  phrasing over historical spellings or awkward literal wording.
-- For user-facing Japanese ellipses, prefer `……` over ASCII `...`.
 
 ### Frontend TSX style
 
-- Preserve the local TSX formatting style.
-- Do not normalize TSX to common Prettier-style React formatting unless
-  explicitly asked.
+- Preserve the local TSX formatting style. Do not normalize TSX to common Prettier-style React formatting unless explicitly asked.
 - Prefer `const` arrow functions for TypeScript/TSX component and helper declarations.
-- Put two blank lines before and after top-level `const` function
-  declarations, unless imports, exports, or file boundaries make that awkward.
-- In TSX, indent with 4-space logical indentation.
-- A leading tab is exactly equivalent to 8 leading spaces.
-- Keep a tag's closing marker on the same line as the final prop when the tag
-  spans multiple lines.
-- Do not put `/>` or `>` on its own line unless the existing surrounding code
-  does so.
-- Keep JSX closing parentheses in the existing compact style, for example
-  `</div>)` rather than moving `)` onto a separate line.
-- Do not add braces around `if`, `else`, or `for` bodies when the body is a
-  single physical line.
-- Always add braces around `if`, `else`, or `for` bodies when the body spans
-  two or more physical lines, even if it is one statement.
-- Do not use a leading semicolon for expression statements such as
-  `;([...]).forEach(...)`; rewrite the expression to avoid ASI hazards
-  explicitly, for example with `void`.
+- Put two blank lines before and after top-level `const` function declarations, unless imports, exports, or file boundaries make that awkward.
+- In TSX, indent nested tag attributes with one tab relative to the tag line. With the project tab width, this visually appears as 4 spaces.
+- Keep a tag's closing marker on the same line as the final prop when the tag spans multiple lines. Do not put `/>` or `>` on its own line unless the existing surrounding code does so.
+- Keep JSX closing parentheses in the existing compact style, for example `</div>)` rather than moving `)` onto a separate line.
 
 Preferred:
 
@@ -221,15 +164,10 @@ function PostFormTagsArea ({ tags, setTags }: Props) {
 
 - First inspect existing patterns; do not invent new architecture when a local convention exists.
 - Keep changes scoped to the requested issue.
-- Do not scan or summarize dependency/generated/runtime directories such as
-  `node_modules`, `dist`, `tmp`, `log`, and `storage` unless explicitly needed.
-- Before touching wiki, tag, versioning, BAN, IP BAN, or authentication
-  behavior, inspect the related request specs and service objects.
-- If frontend code changes, run only non-test verification commands that
-  apply, such as `npm run build` and `npm run lint`. Run `npm run test:run`
-  only when the user explicitly asks for tests.
-- If backend code changes, do not run RSpec unless the user explicitly asks
-  for tests.
+- Do not scan or summarize dependency/generated/runtime directories such as `node_modules`, `dist`, `tmp`, `log`, and `storage` unless explicitly needed.
+- Before touching wiki, tag, versioning, BAN, IP BAN, or authentication behavior, inspect the related request specs and service objects.
+- If frontend code changes, run the existing frontend verification commands that apply: `npm run build`, `npm run lint`, and `npm run test:run`.
+- If backend code changes, run the relevant RSpec command; for broad backend changes, run `bundle exec rspec`.
 - If a verification command cannot be run or fails, report the exact command and failure.
 
 ## Completion criteria
@@ -237,8 +175,7 @@ function PostFormTagsArea ({ tags, setTags }: Props) {
 A task is complete only when:
 
 - implementation is complete,
-- relevant non-test verification commands pass, or failures are clearly
-  explained,
+- relevant verification commands pass, or failures are clearly explained,
 - unrelated files are not changed,
 - migrations and schema are consistent when schema changes are made,
 - user-facing behavior is documented when needed.

backend/AGENTS.md

@@ -4,9 +4,7 @@
 
 These rules apply to work under `backend/`.
 
-This is a Rails API app using Active Record, RSpec, request specs,
-service objects, representation classes, and version tables for post/tag/wiki
-history.
+This is a Rails API app using Active Record, RSpec, request specs, service objects, representation classes, and version tables for post/tag/wiki history.
 
 ## Commands
 
@@ -47,66 +45,37 @@ bundle exec rspec
 
 If a command cannot be run or fails, report the exact command and failure.
 
-Do not create, modify, or run tests unless the user explicitly asks for test
-work. When the user asks for tests, keep working and rerun them until they
-pass or the remaining failure is clearly blocked.
-
 ## Rails structure
 
 - `app/controllers`: API controllers.
 - `app/models`: Active Record models and concerns.
 - `app/representations`: JSON response shaping.
-- `app/services`: domain services such as version recorders, wiki commit,
-  YouTube sync, and similarity calculation.
+- `app/services`: domain services such as version recorders, wiki commit, YouTube sync, and similarity calculation.
 - `config/routes.rb`: public API routes.
 - `db/migrate`: migrations.
 - `db/schema.rb`: schema snapshot.
 - `lib/tasks`: custom Rake tasks.
 - `spec`: RSpec tests.
 
-Before changing behavior, inspect the matching route, controller, model,
-service, representation, and spec.
+Before changing behavior, inspect the matching route, controller, model, service, representation, and spec.
 
 ## Ruby style
 
 - Prefer precise, minimal changes.
 - Use single quotes unless interpolation or escaping makes double quotes better.
 - Do not put a space before Ruby method-call parentheses.
-- Never put a line break immediately before `)` in Ruby.
 - Do not use `%w` or `%i` in new Ruby code.
-- Never write a Ruby line longer than 99 characters.
-- Aim to keep Ruby lines within 79 characters where practical.
-- For small Ruby method definitions that take keyword arguments, match the
-  local no-parentheses style when nearby code uses it.
-- Treat Ruby hash `{ ... }` style and Ruby block `{ ... }` style as separate
-  rules.
-- Do not format Ruby hashes like Ruby blocks.
-- For Ruby hashes, keep the closing `}` on the same line as the final pair.
-- Keep the first pair on the same line as `{` by default.
-- If the hash would exceed the line limit, break after `{` and indent pairs
-  by 4 spaces.
-- Put one logical pair per line when the expression would otherwise become
-  dense.
-- For Ruby arrays, never put whitespace or a line break immediately before `]`.
-- Keep the first element on the same line as `[` by default.
-- If an array would exceed the line limit, break after `[` and indent
-  elements by 4 spaces.
-- For Ruby blocks, use 2-space indentation for the block body.
 - Keep comments short and useful; avoid narrating obvious code.
 - Do not add production dependencies without approval.
 
 ## Authentication and authorization
 
-- Authentication is handled through the `X-Transfer-Code` header in
-  `ApplicationController#authenticate_user`.
+- Authentication is handled through the `X-Transfer-Code` header in `ApplicationController#authenticate_user`.
 - `current_user` is set by looking up `User.inheritance_code`.
-- Do not bypass or weaken the `X-Transfer-Code` flow unless the task
-  explicitly changes authentication.
-- Unauthenticated write actions should return `:unauthorized` consistently
-  with existing controllers.
+- Do not bypass or weaken the `X-Transfer-Code` flow unless the task explicitly changes authentication.
+- Unauthenticated write actions should return `:unauthorized` consistently with existing controllers.
 - Role checks use `User` enum roles: `guest`, `member`, and `admin`.
-- Use `current_user.gte_member?` for member-or-admin write permissions where
-  existing controllers do so.
+- Use `current_user.gte_member?` for member-or-admin write permissions where existing controllers do so.
 - Use `current_user.admin?` only for admin-only paths, such as tag child relationship changes.
 - Do not replace role checks with looser presence checks.
 
@@ -119,9 +88,7 @@ service, representation, and spec.
 - User and IP bans use `banned_at`, not a boolean `banned` column.
 - `User#banned?` and `IpAddress#banned?` check `banned_at.present?`.
 - Do not weaken BAN or IP BAN behavior.
-- If changing request authentication or controller before actions, add or
-  update request specs covering banned users and banned IP addresses only when
-  the user explicitly asks for tests.
+- If changing request authentication or controller before actions, add or update request specs covering banned users and banned IP addresses.
 
 ## RSpec
 
@@ -132,88 +99,49 @@ service, representation, and spec.
 - Put Rake task coverage under `spec/tasks`.
 - `spec/rails_helper.rb` loads `spec/support/**/*.rb`.
 - Request specs include `AuthHelper` and `JsonHelper`.
-- `AuthHelper#sign_in_as(user)` stubs
-  `ApplicationController#current_user`; use it when matching existing
-  request spec style.
-- Add or update request specs for API behavior changes only when the user
-  explicitly asks for tests, especially status codes, permissions, response
-  shape, and version conflict behavior.
+- `AuthHelper#sign_in_as(user)` stubs `ApplicationController#current_user`; use it when matching existing request spec style.
+- Add or update request specs for API behavior changes, especially status codes, permissions, response shape, and version conflict behavior.
 
 ## Migrations
 
 - Keep migrations and `db/schema.rb` consistent.
 - Use reversible migrations where practical; otherwise define explicit `up` and `down`.
-- For data backfills inside migrations, follow the existing pattern of
-  defining migration-local `ActiveRecord::Base` classes with
-  `self.table_name`.
+- For data backfills inside migrations, follow the existing pattern of defining migration-local `ActiveRecord::Base` classes with `self.table_name`.
 - Preserve existing indexes, foreign keys, check constraints, and null constraints.
 - Be careful with MySQL-specific options already present in migrations, such as `after:`.
-- Do not edit old migrations just to change current behavior unless
-  explicitly requested; add a new migration.
+- Do not edit old migrations just to change current behavior unless explicitly requested; add a new migration.
 
 ## Version tables
 
 - Versioned records include posts, tags, nico tags, and wiki pages.
-- Current records have `version_no`; version tables have positive
-  `version_no` with unique indexes scoped to the parent record.
+- Current records have `version_no`; version tables have positive `version_no` with unique indexes scoped to the parent record.
 - Version event types are `create`, `update`, `discard`, and `restore`.
 - Version rows are readonly through the `VersionRecord` concern.
-- Use the existing recorder services instead of manually inserting version
-  rows in application code:
+- Use the existing recorder services instead of manually inserting version rows in application code:
   - `PostVersionRecorder`
   - `TagVersionRecorder`
   - `NicoTagVersionRecorder`
   - `WikiVersionRecorder`
   - `TagVersioning`
-- `VersionRecorder` locks the current record, validates sequence consistency,
-  skips unchanged update snapshots, creates the next version row, and updates
-  the record `version_no`.
+- `VersionRecorder` locks the current record, validates sequence consistency, skips unchanged update snapshots, creates the next version row, and updates the record `version_no`.
 - Do not update versioned records without considering whether a version snapshot must be created.
-- For optimistic concurrency paths, preserve `base_version_no`, `force`, and
-  `merge` semantics. Cover conflicts in request specs only when the user
-  explicitly asks for tests.
+- For optimistic concurrency paths, preserve `base_version_no`, `force`, and `merge` semantics and cover conflicts in request specs.
 
 ## Domain cautions
 
-- Posts have tag snapshots, parent post implications, original-created ranges,
-  viewed state, and version conflict behavior.
-- Tags have canonical names, aliases through `TagName`, categories, parent
-  implications, discard behavior, and version snapshots.
-- Nico tags have separate relation/version behavior; do not treat them like
-  normal editable tags without checking existing code.
-- Wiki pages involve page content, revisions/history, version rows,
-  title/tag-name behavior, and diff/restore paths.
-- Materials, theatres, and comments have user and permission checks; inspect
-  the controller before changing them.
+- Posts have tag snapshots, parent post implications, original-created ranges, viewed state, and version conflict behavior.
+- Tags have canonical names, aliases through `TagName`, categories, parent implications, discard behavior, and version snapshots.
+- Nico tags have separate relation/version behavior; do not treat them like normal editable tags without checking existing code.
+- Wiki pages involve page content, revisions/history, version rows, title/tag-name behavior, and diff/restore paths.
+- Materials, theatres, and comments have user and permission checks; inspect the controller before changing them.
 
 ## API responses
 
 - Use representation classes under `app/representations` when existing endpoints do.
-- Keep response keys consistent with existing JSON contracts.
-- Frontend code expects camelCase conversion client-side, while Rails params
-  and JSON keys are generally snake_case.
-- Preserve existing HTTP status conventions:
-  `:unauthorized` for no user, `:forbidden` for insufficient role or banned
-  user, `:not_found` for missing records, and `:unprocessable_entity` for
-  validation failures.
-- For diagnostic or internal helper JSON, prefer a deliberately light response
-  shape over full representation classes when callers only need identifiers,
-  labels, URLs, or weights.
-
-## Active Record performance
-
-- When a controller action serializes nested associations, preload the
-  associations it will touch instead of allowing N+1 queries.
-- Be sensitive to N+1 queries in all backend work.
-- Avoid introducing N+1 queries, and proactively fix existing N+1 issues when
-  you find them in the code path you are editing.
-- When an association may already be preloaded, prefer loaded-association
-  checks that reuse the preloaded data without losing the efficient database
-  path.
+- Keep response keys consistent with existing JSON contracts; frontend code expects camelCase conversion client-side, while Rails params and JSON keys are generally snake_case.
+- Preserve existing HTTP status conventions: `:unauthorized` for no user, `:forbidden` for insufficient role or banned user, `:not_found` for missing records, and `:unprocessable_entity` for validation failures.
 
 ## Files to avoid in routine work
 
-- Do not inspect or edit `tmp/`, `log/`, `storage/`, `vendor/`, or dependency
-  directories unless explicitly needed.
-- Do not modify generated schema or migration output without the corresponding
-  migration when schema changes are made.
+- Do not inspect or edit `tmp/`, `log/`, `storage/`, `vendor/`, or dependency directories unless explicitly needed.
+- Do not modify generated schema or migration output without the corresponding migration when schema changes are made.

backend/app/controllers/gekanator_games_controller.rb

@@ -1,148 +0,0 @@
-class GekanatorGamesController < ApplicationController
-  def create
-    return head :unauthorized unless current_user
-
-    guessed_post_id = params.require(:guessed_post_id)
-    correct_post_id = params[:correct_post_id].presence
-    answers = params.require(:answers).as_json
-
-    game = GekanatorGame.new(
-        user: current_user,
-        guessed_post_id:,
-        correct_post_id:,
-        won: correct_post_id.present? && guessed_post_id.to_i == correct_post_id.to_i,
-        question_count: answers.length,
-        answers:)
-
-    if game.save
-      render json: { id: game.id }, status: :created
-    else
-      render json: { errors: game.errors.full_messages }, status: :unprocessable_entity
-    end
-  end
-
-  def extra_questions
-    game = find_owned_game
-    return if performed?
-
-    questions =
-        GekanatorQuestion
-        .accepted
-        .includes(:gekanator_question_examples)
-        .where(kind: 'post_similarity', source: 'user_suggested')
-        .to_a
-
-    selected = weighted_sample_questions(
-        questions,
-        post_id: game.correct_post_id,
-        limit: 2)
-
-    render json: {
-      questions: selected.map { |question| extra_question_json(question) }
-    }
-  end
-
-  def extra_question_answers
-    game = find_owned_game
-    return if performed?
-
-    answer_params = params.require(:answers)
-    if !answer_params.is_a?(Array)
-      return render_validation_error fields: { answers: ['配列で指定してください．'] }
-    end
-
-    answers = answer_params.map { |answer|
-      {
-        question_id: answer.require(:question_id).to_i,
-        answer: answer.require(:answer)
-      }
-    }
-    questions = GekanatorQuestion.where(id: answers.map { _1[:question_id] })
-    question_by_id = questions.index_by(&:id)
-    if questions.length != answers.length
-      return render_validation_error fields: { answers: ['質問が見つかりません．'] }
-    end
-    if questions.any? { |question| question.status != 'accepted' || question.kind != 'post_similarity' }
-      return render_validation_error fields: { answers: ['質問が不正です．'] }
-    end
-
-    ActiveRecord::Base.transaction do
-      answers.each do |item|
-        question = question_by_id[item[:question_id]]
-        example =
-            GekanatorQuestionExample.find_or_initialize_by(
-                gekanator_question: question,
-                post: game.correct_post,
-                user: current_user)
-        example.record_answer!(
-            answer: item[:answer],
-            source: 'post_game_extra',
-            gekanator_game: game)
-        example.save!
-      end
-    end
-
-    render json: { count: answers.length }, status: :created
-  end
-
-  private
-
-  def extra_question_json question
-    {
-      id: question.id,
-      text: question.text,
-      source: question.source,
-      priority_weight: question.priority_weight
-    }
-  end
-
-  def weighted_sample_questions questions, post_id:, limit:
-    remaining = questions.uniq(&:id)
-    selected = []
-
-    while selected.length < limit && remaining.any?
-      weighted =
-          remaining.map { |question|
-            [question, selection_weight_for(question, post_id: post_id)]
-          }
-      total_weight = weighted.sum { |_question, weight| weight }
-      break if total_weight <= 0
-
-      target = rand * total_weight
-      cumulative = 0.0
-      chosen =
-          weighted.find do |_question, weight|
-            cumulative += weight
-            cumulative >= target
-          end&.first || weighted.first.first
-
-      selected << chosen
-      remaining.reject! { |question| question.id == chosen.id }
-    end
-
-    selected
-  end
-
-  def selection_weight_for question, post_id:
-    sample_count =
-        question.gekanator_question_examples.sum { |example|
-          next 0 unless example.post_id == post_id
-
-          example.sample_count.presence || 1
-        }
-
-    question.priority_weight.to_f / (1.0 + sample_count * 0.15)
-  end
-
-  def find_owned_game
-    return head :unauthorized unless current_user
-
-    game = GekanatorGame.find_by(id: params[:id])
-    return head :not_found unless game
-    if !current_user.admin? && game.user_id != current_user.id
-      return head :not_found
-    end
-
-    game
-  end
-end

backend/app/controllers/gekanator_posts_controller.rb

@@ -1,44 +0,0 @@
-class GekanatorPostsController < ApplicationController
-  def index
-    posts =
-        Post
-        .preload(tags: :tag_name)
-        .with_attached_thumbnail
-        .order(Arel.sql(
-            'COALESCE(posts.original_created_before - INTERVAL 1 MINUTE, ' \
-            'posts.original_created_from, posts.created_at) DESC, posts.id DESC'))
-
-    render json: { posts: posts.map { |post| post_json(post) } }
-  end
-
-  private
-
-  def post_json post
-    {
-      id: post.id,
-      url: post.url,
-      title: post.title,
-      thumbnail: thumbnail_url(post),
-      thumbnail_base: post.thumbnail_base,
-      original_created_from: post.original_created_from,
-      original_created_before: post.original_created_before,
-      tags: post.tags.map { |tag| tag_json(tag) }
-    }
-  end
-
-  def tag_json tag
-    {
-      id: tag.id,
-      name: tag.name,
-      category: tag.category
-    }
-  end
-
-  def thumbnail_url post
-    return nil unless post.thumbnail.attached?
-
-    rails_storage_proxy_url(post.thumbnail, only_path: false)
-  rescue
-    nil
-  end
-end

backend/app/controllers/gekanator_question_suggestions_controller.rb

@@ -1,56 +0,0 @@
-class GekanatorQuestionSuggestionsController < ApplicationController
-  def create
-    return head :unauthorized unless current_user
-
-    game = GekanatorGame.find_by(id: params.require(:gekanator_game_id))
-    return head :not_found unless game
-    if !current_user.admin? && game.user_id != current_user.id
-      return head :not_found
-    end
-
-    suggestion = GekanatorQuestionSuggestion.new(
-        gekanator_game: game,
-        user: current_user,
-        question_text: params.require(:question_text),
-        answer: params.require(:answer))
-
-    if suggestion.valid?
-      ActiveRecord::Base.transaction do
-        suggestion.save!
-        Gekanator::QuestionSuggestionPromoter.call(
-            suggestion: suggestion,
-            user: current_user)
-      end
-
-      render json: {
-        id: suggestion.id,
-        count: game.question_suggestions.count
-      }, status: :created
-    else
-      render_validation_error suggestion
-    end
-  end
-
-  def ai_convert
-    return head :not_found unless current_user&.admin?
-
-    suggestion = GekanatorQuestionSuggestion.find_by(id: params[:id])
-    return head :not_found unless suggestion
-    if Gekanator::AiRunBudget.exceeded_after_next_run?
-      suggestion.gekanator_ai_runs.create!(
-          model: 'budget_guard',
-          status: 'blocked_budget',
-          input_tokens: 0,
-          output_tokens: 0,
-          estimated_cost_jpy: 0)
-      return head :payment_required
-    end
-
-    Gekanator::QuestionSuggestionAiConverter.call(
-        suggestion: suggestion,
-        user: current_user)
-    head :no_content
-  rescue NotImplementedError
-    head :not_implemented
-  end
-end

backend/app/controllers/gekanator_questions_controller.rb

@@ -1,102 +0,0 @@
-class GekanatorQuestionsController < ApplicationController
-  def index
-    questions =
-        GekanatorQuestion
-        .accepted
-        .includes(:gekanator_question_examples)
-        .order(priority_weight: :desc, id: :asc)
-
-    render json: {
-      questions: questions.map { |question| question_json(question) }
-    }
-  end
-
-  private
-
-  def question_json question
-    condition = condition_json(question.condition).deep_symbolize_keys
-    json = {
-      id: question_id_for(question, condition),
-      text: question_text_for(question, condition),
-      kind: question.kind,
-      condition: condition,
-      source: question.source,
-      priority_weight: question.priority_weight
-    }
-    if question.kind == 'post_similarity'
-      json[:example_answers] = example_answers_json(question)
-    end
-    json
-  end
-
-  def question_id_for question, condition
-    case condition[:type]
-    when 'tag'
-      "tag:#{ condition[:key] }"
-    when 'source'
-      "source:#{ condition[:host] }"
-    when 'original-year'
-      "original-year:#{ condition[:year] }"
-    when 'original-month'
-      "original-month:#{ condition[:month] }"
-    when 'original-month-day'
-      "original-month-day:#{ condition[:monthDay] || condition[:month_day] }"
-    when 'title-length-at-least'
-      "title:length-at-least:#{ condition[:length] }"
-    when 'title-length-greater-than'
-      "title:length-at-least:#{ condition[:length].to_i + 1 }"
-    when 'title-has-ascii'
-      'title:ascii'
-    when 'title-contains'
-      "title:contains:#{ condition[:text] }"
-    when 'post-similarity'
-      "post-similarity:#{ question.id }"
-    else
-      "catalog:#{ question.id }"
-    end
-  end
-
-  def condition_json condition
-    json = condition.deep_dup.as_json
-
-    if json['type'] == 'original-month-day' && json['monthDay'].blank?
-      json['monthDay'] = json.delete('month_day')
-    end
-
-    if json['type'] == 'title-length-greater-than'
-      json['type'] = 'title-length-at-least'
-      json['length'] = json['length'].to_i + 1
-    end
-
-    json
-  end
-
-  def question_text_for question, condition
-    return question.text unless question.kind == 'title'
-
-    case condition[:type]
-    when 'title-length-at-least'
-      "タイトルは #{ condition[:length] } 文字以上?"
-    when 'title-contains'
-      "題名に「#{ condition[:text] }」が含まれる?"
-    else
-      question.text
-    end
-  end
-
-  def example_answers_json question
-    question
-        .gekanator_question_examples
-        .group_by(&:post_id)
-        .transform_values { |examples| aggregate_answer(examples) }
-  end
-
-  def aggregate_answer examples
-    examples
-        .group_by(&:answer)
-        .map { |answer, grouped| [answer, grouped.sum(&:weight), grouped.max_by(&:updated_at)&.updated_at] }
-        .sort_by { |(_answer, weight, updated_at)| [-weight, -(updated_at&.to_f || 0)] }
-        .first
-        &.first
-  end
-end

backend/app/controllers/posts_controller.rb

@@ -44,8 +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(:uploaded_user, :parents, :children,
-                 tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+        .preload(:uploaded_user, tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -96,7 +95,7 @@ class PostsController < ApplicationController
   end
 
   def random
-    post = filtered_posts.preload(:uploaded_user, :parents, :children,
+    post = filtered_posts.preload(:uploaded_user,
                                   tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
                          .with_attached_thumbnail
                          .order('RAND()')
@@ -109,8 +108,7 @@ class PostsController < ApplicationController
   def show
     post =
         Post
-        .includes(:uploaded_user, :parents, :children,
-                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+        .includes(:uploaded_user, tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
         .find_by(id: params[:id])
     return head :not_found unless post

backend/app/controllers/theatre_comments_controller.rb

@@ -1,21 +1,14 @@
 class TheatreCommentsController < ApplicationController
   def index
-    limit = params[:limit].to_i
-    limit = 20 if limit <= 0
-
     no_gt = params[:no_gt].to_i
-    no_gt = 0 if no_gt < 0
+    no_gt = 0 if no_gt.negative?
 
     comments = TheatreComment
                .where(theatre_id: params[:theatre_id])
                .where('no > ?', no_gt)
                .order(no: :desc)
-               .limit(limit)
 
-    render json: comments.map {
-      _1.as_json(include: { user: { only: [:id, :name] } })
-          .merge(content: _1.discarded? ? nil : _1.content, deleted: _1.discarded?)
-    }
+    render json: comments.as_json(include: { user: { only: [:id, :name] } })
   end
 
   def create
@@ -36,19 +29,4 @@ class TheatreCommentsController < ApplicationController
 
     render json: comment, status: :created
   end
-
-  def destroy
-    return head :unauthorized unless current_user
-
-    theatre_id = params[:theatre_id].to_i
-    no = params[:id].to_i
-
-    comment = TheatreComment.find_by(theatre_id:, no:)
-    return head :not_found unless comment
-    return head :forbidden unless comment.user == current_user
-
-    comment.discard!
-
-    head :no_content
-  end
 end

backend/app/controllers/theatre_programmes_controller.rb

@@ -1,22 +0,0 @@
-class TheatreProgrammesController < ApplicationController
-  def index
-    limit = params[:limit].to_i
-    limit = 100 if limit <= 0
-
-    position_gt = params[:position_gt].to_i
-    position_gt = 0 if position_gt < 0
-
-    programmes = TheatreProgramme
-                 .where(theatre_id: params[:theatre_id])
-                 .where('position > ?', position_gt)
-                 .includes(:post)
-                 .order(position: :desc).limit(100)
-                 .limit(limit)
-
-    render json: programmes.map { |programme|
-      programme.as_json.merge(post: { id: programme.post.id,
-                                      title: programme.post.title,
-                                      url: programme.post.url })
-    }
-  end
-end

backend/app/controllers/theatre_skip_events_controller.rb

@@ -1,22 +0,0 @@
-class TheatreSkipEventsController < ApplicationController
-  def index
-    limit = params[:limit].to_i
-    limit = 50 if limit <= 0
-
-    events =
-        TheatreSkipEvent
-        .where(theatre_id: params[:theatre_id])
-        .includes(:post, tags: :tag_name)
-        .order(created_at: :desc)
-        .limit(limit)
-
-    render json: events.map { |event|
-      { id: event.id,
-        theatre_id: event.theatre_id,
-        post: { id: event.post.id, title: event.post.title, url: event.post.url },
-        tags: event.tags.map { |tag| { id: tag.id, name: tag.name } },
-        programme_position: event.programme_position,
-        created_at: event.created_at }
-    }
-  end
-end

backend/app/controllers/theatres_controller.rb

@@ -31,7 +31,9 @@ class TheatresController < ApplicationController
       post_started_at = theatre.current_post_started_at
     end
 
-    render json: theatre_info_json(theatre, host_flg:, post_id:, post_started_at:)
+    render json: {
+        host_flg:, post_id:, post_started_at:,
+        watching_users: theatre.watching_users.as_json(only: [:id, :name]) }
   end
 
   def next_post
@@ -41,119 +43,12 @@ class TheatresController < ApplicationController
     return head :not_found unless theatre
     return head :forbidden if theatre.host_user != current_user
 
-    ApplicationRecord.transaction do
-      theatre.lock!
-      TheatrePostAdvancer.call(theatre:)
-    end
+    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
-
-  def skip_vote
-    return head :unauthorized unless current_user
-
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-    requested_post_id = params[:post_id].to_i
-    return head :unprocessable_entity if requested_post_id <= 0
-
-    skipped = false
-    conflicted = false
-
-    ApplicationRecord.transaction do
-      theatre.lock!
-      if theatre.current_post
-        TheatreWatchingUser.find_or_initialize_by(theatre:, user: current_user).tap {
-          _1.expires_at = 30.seconds.from_now
-        }.save!
-
-        if theatre.current_post_id != requested_post_id
-          conflicted = true
-          next
-        end
-
-        TheatreSkipVote.find_or_create_by!(theatre:, post_id: requested_post_id, user: current_user)
-
-        vote_status = skip_vote_status(theatre)
-        if vote_status[:votes_count] >= vote_status[:required_count]
-          TheatreSkipFinalizer.call(theatre:, user: current_user)
-          TheatrePostAdvancer.call(theatre:)
-          skipped = true
-        end
-      end
-    end
-
-    theatre.reload
-    return render json: theatre_info_json(theatre, skipped: false), status: :conflict if conflicted
-
-    render json: theatre_info_json(theatre, skipped:)
-  end
-
-  def unskip_vote
-    return head :unauthorized unless current_user
-
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-    requested_post_id = params[:post_id].to_i
-    return head :unprocessable_entity if requested_post_id <= 0
-
-    conflicted = false
-
-    theatre.with_lock do
-      if theatre.current_post
-        if theatre.current_post_id != requested_post_id
-          conflicted = true
-        else
-          TheatreSkipVote.where(theatre:, post_id: requested_post_id, user: current_user).delete_all
-        end
-      end
-    end
-
-    theatre.reload
-    return render json: theatre_info_json(theatre, skipped: false), status: :conflict if conflicted
-
-    render json: theatre_info_json(theatre, skipped: false)
-  end
-
-  def post_selection_weights
-    theatre = Theatre.find_by(id: params[:id])
-    return head :not_found unless theatre
-
-    render json: TheatrePostSelector.new(theatre:).weight_json
-  end
-
-  private
-
-  def theatre_info_json(theatre, host_flg: nil, post_id: nil, post_started_at: nil, skipped: nil)
-    host_flg = theatre.host_user_id == current_user&.id if host_flg.nil?
-    post_id = theatre.current_post_id if post_id.nil?
-    post_started_at = theatre.current_post_started_at if post_started_at.nil?
-
-    json = { host_flg:,
-             post_id:,
-             post_started_at:,
-             post_elapsed_ms: post_started_at ? ((Time.current - post_started_at) * 1000).floor : nil,
-             watching_users: theatre.watching_users.as_json(only: [:id, :name]),
-             skip_vote: skip_vote_status(theatre) }
-    json[:skipped] = skipped unless skipped.nil?
-    json
-  end
-
-  def skip_vote_status(theatre)
-    watching_user_ids = theatre.watching_users.ids
-    watching_users_count = watching_user_ids.size
-    required_count = (watching_users_count / 2) + 1
-    post = theatre.current_post
-    votes =
-        if post
-          TheatreSkipVote.where(theatre:, post:, user_id: watching_user_ids)
-        else
-          TheatreSkipVote.none
-        end
-
-    { votes_count: post ? votes.count : 0,
-      required_count:,
-      watching_users_count:,
-      voted: post && current_user ? votes.exists?(user_id: current_user.id) : false }
-  end
 end

backend/app/models/gekanator_ai_run.rb

@@ -1,21 +0,0 @@
-class GekanatorAiRun < ApplicationRecord
-  STATUSES = ['pending', 'running', 'succeeded', 'failed', 'blocked_budget'].freeze
-
-  belongs_to :gekanator_question_suggestion
-
-  validates :model, presence: true, length: { maximum: 255 }
-  validates :status, presence: true, inclusion: { in: STATUSES }
-  validates :input_tokens,
-            presence: true,
-            numericality: { only_integer: true, greater_than_or_equal_to: 0 }
-  validates :output_tokens,
-            presence: true,
-            numericality: { only_integer: true, greater_than_or_equal_to: 0 }
-  validates :estimated_cost_jpy,
-            presence: true,
-            numericality: { greater_than_or_equal_to: 0 }
-
-  scope :this_month, lambda {
-    where(created_at: Time.current.beginning_of_month..Time.current.end_of_month)
-  }
-end

backend/app/models/gekanator_game.rb

@@ -1,15 +0,0 @@
-class GekanatorGame < ApplicationRecord
-  belongs_to :user
-  belongs_to :guessed_post, class_name: 'Post'
-  belongs_to :correct_post, class_name: 'Post'
-  has_many :question_suggestions,
-           class_name: 'GekanatorQuestionSuggestion',
-           dependent: :delete_all
-  has_many :question_examples,
-           class_name: 'GekanatorQuestionExample',
-           dependent: :delete_all
-
-  validates :answers, presence: true
-  validates :question_count, numericality: { greater_than_or_equal_to: 0 }
-  validates :won, inclusion: { in: [true, false] }
-end

backend/app/models/gekanator_question.rb

@@ -1,23 +0,0 @@
-class GekanatorQuestion < ApplicationRecord
-  KINDS = ['tag', 'source', 'title', 'original_date', 'post_similarity'].freeze
-  SOURCES = ['user_suggested', 'ai_generated', 'admin_curated'].freeze
-  STATUSES = ['pending', 'accepted', 'rejected', 'disabled'].freeze
-
-  belongs_to :gekanator_question_suggestion, optional: true
-  belongs_to :created_by, class_name: 'User', optional: true
-  has_many :gekanator_question_examples, dependent: :delete_all
-
-  validates :kind, presence: true, inclusion: { in: KINDS }
-  validates :source, presence: true, inclusion: { in: SOURCES }
-  validates :status, presence: true, inclusion: { in: STATUSES }
-  validates :text, presence: true, length: { maximum: 1000 }
-  validates :condition, presence: true
-  validates :priority_weight,
-            presence: true,
-            numericality: {
-              greater_than: 0,
-              less_than_or_equal_to: 3
-            }
-
-  scope :accepted, -> { where(status: 'accepted') }
-end

backend/app/models/gekanator_question_example.rb

@@ -1,97 +0,0 @@
-class GekanatorQuestionExample < ApplicationRecord
-  ANSWERS = GekanatorQuestionSuggestion::ANSWERS
-  NON_UNKNOWN_ANSWERS = ANSWERS - ['unknown']
-  SOURCES = ['initial_suggestion', 'post_game_extra'].freeze
-
-  belongs_to :gekanator_question
-  belongs_to :post
-  belongs_to :user
-  belongs_to :gekanator_game, optional: true
-
-  validates :answer, presence: true, inclusion: { in: ANSWERS }
-  validates :answer_counts, presence: true
-  validates :sample_count,
-            presence: true,
-            numericality: {
-              only_integer: true,
-              greater_than: 0
-            }
-  validates :source, presence: true, inclusion: { in: SOURCES }
-  validates :weight,
-            presence: true,
-            numericality: {
-              greater_than: 0
-            }
-
-  before_validation :normalize_learning_state
-
-  def record_answer!(answer:, source:, gekanator_game: nil)
-    answer = answer.to_s
-    raise ArgumentError, 'invalid answer' unless ANSWERS.include?(answer)
-
-    counts = normalized_answer_counts
-    counts[answer] += 1
-
-    self.answer_counts = counts
-    self.sample_count = counts.values.sum
-    self.gekanator_game = gekanator_game if gekanator_game.present?
-    self.source = source if new_record?
-
-    apply_aggregated_answer!(preferred_answer: answer)
-    self
-  end
-
-  private
-
-  def normalize_learning_state
-    counts = normalized_answer_counts
-
-    if counts.values.sum.zero? && answer.present?
-      counts[answer] = 1
-    end
-
-    self.answer_counts = counts
-    self.sample_count = counts.values.sum
-
-    apply_aggregated_answer!
-  end
-
-  def apply_aggregated_answer!(preferred_answer: nil)
-    counts = normalized_answer_counts
-    known_counts = counts.slice(*NON_UNKNOWN_ANSWERS)
-    known_total = known_counts.values.sum
-
-    if known_total.zero?
-      self.answer = 'unknown'
-      self.weight = 0.1
-      return
-    else
-      max_count = known_counts.values.max
-      candidates = known_counts.select { |_answer, count| count == max_count }.keys
-      self.answer =
-          if preferred_answer.present? && candidates.include?(preferred_answer)
-            preferred_answer
-          elsif answer.present? && candidates.include?(answer)
-            answer
-          else
-            candidates.first
-          end
-    end
-
-    consensus = max_count.to_f / known_total
-    self.weight = Math.sqrt(known_total) * consensus
-  end
-
-  def normalized_answer_counts
-    base = ANSWERS.index_with(0)
-
-    answer_counts.to_h.each do |key, value|
-      answer_key = key.to_s
-      next unless ANSWERS.include?(answer_key)
-
-      base[answer_key] = value.to_i
-    end
-
-    base
-  end
-end

backend/app/models/gekanator_question_suggestion.rb

@@ -1,25 +0,0 @@
-class GekanatorQuestionSuggestion < ApplicationRecord
-  MAX_QUESTIONS_PER_GAME = 3
-  ANSWERS = ['yes', 'no', 'partial', 'probably_no', 'unknown'].freeze
-
-  belongs_to :gekanator_game
-  belongs_to :user
-  has_many :gekanator_questions, dependent: :nullify
-  has_many :gekanator_ai_runs, dependent: :destroy
-
-  validates :question_text, presence: true, length: { maximum: 1000 }
-  validates :answer, presence: true, inclusion: { in: ANSWERS }
-  validates :processed, inclusion: { in: [true, false] }
-  validate :question_suggestion_limit_per_game, on: :create
-
-  private
-
-  def question_suggestion_limit_per_game
-    return if gekanator_game_id.blank?
-
-    count = GekanatorQuestionSuggestion.where(gekanator_game_id:).count
-    if count >= MAX_QUESTIONS_PER_GAME
-      errors.add(:base, '質問追加数を超えてゐます．')
-    end
-  end
-end

backend/app/models/post.rb

@@ -11,17 +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_many :gekanator_guessed_games,
-           class_name: 'GekanatorGame',
-           foreign_key: :guessed_post_id,
-           dependent: :delete_all,
-           inverse_of: :guessed_post
-  has_many :gekanator_correct_games,
-           class_name: 'GekanatorGame',
-           foreign_key: :correct_post_id,
-           dependent: :delete_all,
-           inverse_of: :correct_post
-  has_many :gekanator_question_examples, dependent: :delete_all
 
   has_many :parent_post_implications,
            class_name: 'PostImplication',

backend/app/models/tag.rb

@@ -81,7 +81,7 @@ class Tag < ApplicationRecord
 
   def material_id = materials.first&.id
 
-  def has_deerjikists = deerjikists.loaded? ? deerjikists.any? : deerjikists.exists?
+  def has_deerjikists = deerjikists.present?
 
   def self.tagme = find_or_create_by_tag_name!('タグ希望', category: :meta)
   def self.bot = find_or_create_by_tag_name!('bot操作', category: :meta)

backend/app/models/theatre.rb

@@ -7,10 +7,6 @@ class Theatre < ApplicationRecord
            class_name: 'TheatreWatchingUser', inverse_of: :theatre
   has_many :watching_users, through: :active_theatre_watching_users, source: :user
 
-  has_many :programmes, class_name: 'TheatreProgramme'
-  has_many :skip_votes, class_name: 'TheatreSkipVote', dependent: :delete_all
-  has_many :skip_events, class_name: 'TheatreSkipEvent', dependent: :delete_all
-
   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'

backend/app/models/theatre_programme.rb

@@ -1,6 +0,0 @@
-class TheatreProgramme < ApplicationRecord
-  self.primary_key = :theatre_id, :position
-
-  belongs_to :theatre
-  belongs_to :post
-end

backend/app/models/theatre_skip_event.rb

@@ -1,10 +0,0 @@
-class TheatreSkipEvent < ApplicationRecord
-  belongs_to :theatre
-  belongs_to :post
-  belongs_to :skipped_by_user, class_name: 'User'
-
-  has_many :voters, class_name: 'TheatreSkipEventVoter', dependent: :delete_all
-  has_many :event_tags, class_name: 'TheatreSkipEventTag', dependent: :delete_all
-  has_many :users, through: :voters
-  has_many :tags, through: :event_tags
-end

backend/app/models/theatre_skip_event_tag.rb

@@ -1,6 +0,0 @@
-class TheatreSkipEventTag < ApplicationRecord
-  self.primary_key = :theatre_skip_event_id, :tag_id
-
-  belongs_to :theatre_skip_event
-  belongs_to :tag
-end

backend/app/models/theatre_skip_event_voter.rb

@@ -1,6 +0,0 @@
-class TheatreSkipEventVoter < ApplicationRecord
-  self.primary_key = :theatre_skip_event_id, :user_id
-
-  belongs_to :theatre_skip_event
-  belongs_to :user
-end

backend/app/models/theatre_skip_vote.rb

@@ -1,7 +0,0 @@
-class TheatreSkipVote < ApplicationRecord
-  self.primary_key = :theatre_id, :post_id, :user_id
-
-  belongs_to :theatre
-  belongs_to :post
-  belongs_to :user
-end

backend/app/services/gekanator/ai_run_budget.rb

@@ -1,22 +0,0 @@
-module Gekanator
-  class AiRunBudget
-    MONTHLY_LIMIT_JPY = BigDecimal('450').freeze
-    MAX_RUN_ESTIMATED_COST_JPY = BigDecimal('5').freeze
-
-    def self.remaining_monthly_budget_jpy
-      MONTHLY_LIMIT_JPY - monthly_cost_jpy
-    end
-
-    def self.monthly_cost_jpy
-      GekanatorAiRun.this_month.sum(:estimated_cost_jpy)
-    end
-
-    def self.exceeded?
-      monthly_cost_jpy >= MONTHLY_LIMIT_JPY
-    end
-
-    def self.exceeded_after_next_run?
-      monthly_cost_jpy + MAX_RUN_ESTIMATED_COST_JPY >= MONTHLY_LIMIT_JPY
-    end
-  end
-end

backend/app/services/gekanator/question_suggestion_ai_converter.rb

@@ -1,168 +0,0 @@
-module Gekanator
-  class QuestionSuggestionAiConverter
-    # Temporary heuristic converter for #361.
-    # This creates pending ai_generated questions without external LLM calls;
-    # accepted questions are still distributed only after admin approval.
-    TITLE_LENGTH_RE = /\Aタイトルは\s*(\d+)\s*文字以上[？?]\z/
-    ORIGINAL_YEAR_RE = /\Aオリジナルの投稿年は\s*(\d{4})\s*年[？?]\z/
-    ORIGINAL_MONTH_RE = /\Aオリジナルの投稿月は\s*(\d{1,2})\s*月[？?]\z/
-    ORIGINAL_MONTH_DAY_RE = /\Aオリジナルの投稿日は\s*(\d{1,2})\s*月\s*(\d{1,2})\s*日[？?]\z/
-    TITLE_CONTAINS_RE = /\A題名に「(.+?)」が含まれる[？?]\z/
-    SOURCE_RE = /\A(.+?)\s+の投稿を思[ひい]浮かべて[ゐい]る[？?]\z/
-
-    def self.call(...) = new(...).call
-
-    def initialize suggestion:, user:
-      @suggestion = suggestion
-      @user = user
-    end
-
-    def call
-      suggestion.with_lock do
-        existing = existing_generated_question
-        return existing if existing
-
-        run = suggestion.gekanator_ai_runs.create!(
-            model: 'heuristic_converter_v1',
-            status: 'running',
-            input_tokens: 0,
-            output_tokens: 0,
-            estimated_cost_jpy: 0)
-
-        question_attributes = build_question
-        question =
-            question_attributes &&
-            GekanatorQuestion.create!(
-                **question_attributes,
-                source: 'ai_generated',
-                status: 'pending',
-                gekanator_question_suggestion: suggestion,
-                created_by: user)
-
-        run.update!(status: question ? 'succeeded' : 'failed')
-        question
-      end
-    rescue => error
-      run&.update!(status: 'failed') if run&.persisted? && run.status != 'failed'
-      raise error
-    end
-
-    private
-
-    attr_reader :suggestion, :user
-
-    def existing_generated_question
-      suggestion
-          .gekanator_questions
-          .where(source: 'ai_generated')
-          .order(id: :desc)
-          .first
-    end
-
-    def build_question
-      text = normalized_text
-      return nil if text.blank?
-
-      structured_question_for(text) || post_similarity_question_for(text)
-    end
-
-    def normalized_text
-      suggestion.question_text.to_s.gsub(/[[:space:]]+/, ' ').strip
-    end
-
-    def structured_question_for text
-      case text
-      when TITLE_LENGTH_RE
-        length = Regexp.last_match(1).to_i
-        return nil if length <= 0
-
-        {
-          text:,
-          kind: 'title',
-          condition: {
-            type: 'title-length-at-least',
-            length:
-          },
-          priority_weight: 0.95
-        }
-      when /\A題名に英数字が混じって[ゐい]る[？?]\z/
-        {
-          text: '題名に英数字が混じってゐる?',
-          kind: 'title',
-          condition: { type: 'title-has-ascii' },
-          priority_weight: 0.95
-        }
-      when ORIGINAL_YEAR_RE
-        year = Regexp.last_match(1).to_i
-        {
-          text:,
-          kind: 'original_date',
-          condition: { type: 'original-year', year: },
-          priority_weight: 0.95
-        }
-      when ORIGINAL_MONTH_RE
-        month = Regexp.last_match(1).to_i
-        return nil unless month.between?(1, 12)
-
-        {
-          text:,
-          kind: 'original_date',
-          condition: { type: 'original-month', month: },
-          priority_weight: 0.95
-        }
-      when ORIGINAL_MONTH_DAY_RE
-        month = Regexp.last_match(1).to_i
-        day = Regexp.last_match(2).to_i
-        return nil unless month.between?(1, 12) && day.between?(1, 31)
-
-        {
-          text:,
-          kind: 'original_date',
-          condition: {
-            type: 'original-month-day',
-            monthDay: "#{ month }-#{ day }"
-          },
-          priority_weight: 0.95
-        }
-      when TITLE_CONTAINS_RE
-        title_text = Regexp.last_match(1).to_s.strip
-        return nil if title_text.blank?
-
-        {
-          text: "題名に「#{ title_text }」が含まれる?",
-          kind: 'title',
-          condition: { type: 'title-contains', text: title_text },
-          priority_weight: 0.95
-        }
-      when SOURCE_RE
-        host = Regexp.last_match(1).to_s.strip
-        return nil if host.blank?
-
-        {
-          text:,
-          kind: 'source',
-          condition: { type: 'source', host: },
-          priority_weight: 0.95
-        }
-      else
-        nil
-      end
-    end
-
-    def post_similarity_question_for text
-      return nil if suggestion.answer == 'unknown'
-
-      {
-        text:,
-        kind: 'post_similarity',
-        condition: {
-          type: 'post-similarity',
-          postId: suggestion.gekanator_game.correct_post_id,
-          answer: suggestion.answer,
-          threshold: 0.65
-        },
-        priority_weight: 1.0
-      }
-    end
-  end
-end

backend/app/services/gekanator/question_suggestion_promoter.rb

@@ -1,52 +0,0 @@
-module Gekanator
-  class QuestionSuggestionPromoter
-    def self.call(...) = new(...).call
-
-    def initialize suggestion:, user:
-      @suggestion = suggestion
-      @user = user
-    end
-
-    def call
-      suggestion.with_lock do
-        return promoted_question if suggestion.processed?
-        return suggestion if suggestion.answer == 'unknown'
-
-        question = GekanatorQuestion.create!(
-            text: suggestion.question_text,
-            kind: 'post_similarity',
-            source: 'user_suggested',
-            status: 'accepted',
-            priority_weight: 1.2,
-            condition: {
-              type: 'post-similarity',
-              postId: suggestion.gekanator_game.correct_post_id,
-              answer: suggestion.answer,
-              threshold: 0.65
-            },
-            gekanator_question_suggestion: suggestion,
-            created_by: user)
-        example =
-            GekanatorQuestionExample.new(
-                gekanator_question: question,
-                post: suggestion.gekanator_game.correct_post,
-                user: user)
-        example.record_answer!(
-            answer: suggestion.answer,
-            source: 'initial_suggestion',
-            gekanator_game: suggestion.gekanator_game)
-        example.save!
-        suggestion.update!(processed: true)
-        question
-      end
-    end
-
-    private
-
-    attr_reader :suggestion, :user
-
-    def promoted_question
-      suggestion.gekanator_questions.order(id: :desc).first
-    end
-  end
-end

backend/app/services/theatre_post_advancer.rb

@@ -1,29 +0,0 @@
-class TheatrePostAdvancer
-  def self.call(theatre:)
-    new(theatre:).call
-  end
-
-  def initialize(theatre:)
-    @theatre = theatre
-  end
-
-  def call
-    previous_post = theatre.current_post
-    post = TheatrePostSelector.new(theatre:).select
-
-    TheatreSkipVote.where(theatre:, post: previous_post).delete_all if previous_post
-
-    theatre.update!(current_post: post, current_post_started_at: post ? Time.current : nil)
-
-    if post
-      position = (theatre.programmes.maximum(:position) || 0) + 1
-      theatre.programmes.create!(position:, post:)
-    end
-
-    post
-  end
-
-  private
-
-  attr_reader :theatre
-end

backend/app/services/theatre_post_selector.rb

@@ -1,119 +0,0 @@
-class TheatrePostSelector
-  Candidate = Struct.new(:post, :weight, :penalty, :tags, keyword_init: true)
-  ELIGIBLE_POST_URL_CONDITION =
-      ["url LIKE '%nicovideo.jp%'",
-       "url LIKE '%youtube.com/watch%'",
-       "url LIKE '%youtu.be/%'"]
-      .join(' OR ')
-
-  def initialize theatre:
-    @theatre = theatre
-  end
-
-  def select
-    candidates = weighted_candidates
-    return nil if candidates.empty?
-
-    total = candidates.sum(&:weight)
-    target = rand * total
-
-    candidates.each do |candidate|
-      target -= candidate.weight
-      return candidate.post if target <= 0
-    end
-
-    candidates.last.post
-  end
-
-  def weight_json limit: 20
-    candidates = weighted_candidates
-    sorted = candidates.sort_by { |candidate| [candidate.weight, candidate.post.id] }
-
-    { tag_penalties: tag_penalty_json,
-      lightest_posts: post_weight_json(sorted.first(limit)),
-      heaviest_posts: post_weight_json(sorted.reverse.first(limit)) }
-  end
-
-  private
-
-  attr_reader :theatre
-
-  def weighted_candidates
-    @weighted_candidates ||= begin
-      penalties = tag_penalties
-      posts = eligible_posts.includes(tags: :tag_name).to_a
-
-      posts.map do |post|
-        post_tags = post.tags.to_a
-        penalty = post_tags.sum { |tag| penalties[tag.id].to_i }
-
-        Candidate.new(
-            post:,
-            penalty:,
-            tags: post_tags,
-            weight: 1.0 / (1.0 + penalty))
-      end
-    end
-  end
-
-  def eligible_posts
-    posts = Post.where(ELIGIBLE_POST_URL_CONDITION)
-    posts = posts.where.not(id: theatre.current_post_id) if theatre.current_post_id
-    posts
-  end
-
-  def active_user_ids
-    @active_user_ids ||= theatre.watching_users.ids
-  end
-
-  def tag_penalties
-    @tag_penalties ||=
-      if active_user_ids.empty?
-        {}
-      else
-        TheatreSkipEventVoter
-          .joins(theatre_skip_event: :event_tags)
-          .where(user_id: active_user_ids)
-          .group('theatre_skip_event_tags.tag_id')
-          .count
-      end
-  end
-
-  def tag_penalty_json
-    return [] if tag_penalties.empty?
-
-    tags = Tag.where(id: tag_penalties.keys).includes(:tag_name).index_by(&:id)
-
-    tag_penalties
-      .map { |tag_id, penalty|
-        tag = tags[tag_id]
-        next unless tag
-
-        { tag: light_tag_json(tag),
-          penalty: }
-      }
-      .compact
-      .sort_by { |row| [-row[:penalty], row[:tag][:name].to_s] }
-  end
-
-  def post_weight_json candidates
-    candidates.map { |candidate|
-      { post: light_post_json(candidate.post),
-        weight: candidate.weight,
-        penalty: candidate.penalty,
-        tags: candidate.tags.map { |tag| light_tag_json(tag) } }
-    }
-  end
-
-  def light_post_json post
-    { id: post.id,
-      title: post.title,
-      url: post.url }
-  end
-
-  def light_tag_json tag
-    { id: tag.id,
-      name: tag.name,
-      category: tag.category }
-  end
-end

backend/app/services/theatre_skip_finalizer.rb

@@ -1,40 +0,0 @@
-class TheatreSkipFinalizer
-  def self.call(theatre:, user:)
-    new(theatre:, user:).call
-  end
-
-  def initialize(theatre:, user:)
-    @theatre = theatre
-    @user = user
-  end
-
-  def call
-    return unless theatre.current_post
-
-    post = theatre.current_post
-    voters = TheatreSkipVote.where(theatre:, post:).includes(:user).map(&:user)
-    return if voters.empty?
-
-    event = TheatreSkipEvent.create!(
-        theatre:,
-        post:,
-        skipped_by_user: user,
-        programme_position: theatre.programmes.maximum(:position))
-
-    voters.uniq(&:id).each do |voter|
-      TheatreSkipEventVoter.create!(theatre_skip_event: event, user: voter)
-    end
-
-    post.tags.find_each do |tag|
-      TheatreSkipEventTag.create!(theatre_skip_event: event, tag:)
-    end
-
-    TheatreSkipVote.where(theatre:, post:).delete_all
-
-    event
-  end
-
-  private
-
-  attr_reader :theatre, :user
-end

backend/config/routes.rb

@@ -63,24 +63,6 @@ Rails.application.routes.draw do
     end
   end
 
-  namespace :gekanator do
-    resources :games, only: [:create], controller: '/gekanator_games' do
-      member do
-        get :extra_questions
-        post :extra_question_answers
-      end
-    end
-    resources :posts, only: [:index], controller: '/gekanator_posts'
-    resources :questions, only: [:index], controller: '/gekanator_questions'
-    resources :question_suggestions,
-              only: [:create],
-              controller: '/gekanator_question_suggestions' do
-      member do
-        post :ai_convert
-      end
-    end
-  end
-
   resources :users, only: [:create, :update] do
     collection do
       post :verify
@@ -103,14 +85,9 @@ Rails.application.routes.draw do
     member do
       put :watching
       patch :next_post
-      put :skip_vote
-      delete :skip_vote, action: :unskip_vote
-      get :post_selection_weights
     end
 
-    resources :comments, controller: :theatre_comments, only: [:index, :create, :destroy]
-    resources :programmes, controller: :theatre_programmes, only: [:index]
-    resources :skip_events, controller: :theatre_skip_events, only: [:index]
+    resources :comments, controller: :theatre_comments, only: [:index, :create]
   end
 
   resources :materials, only: [:index, :show, :create, :update, :destroy]

backend/db/migrate/20260514221900_create_theatre_programmes.rb

@@ -1,10 +0,0 @@
-class CreateTheatreProgrammes < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatre_programmes, primary_key: [:theatre_id, :position] do |t|
-      t.references :theatre, null: false, foreign_key: true
-      t.integer :position, null: false
-      t.references :post, null: false, foreign_key: true
-      t.datetime :created_at, null: false
-    end
-  end
-end

backend/db/migrate/20260606000000_create_theatre_skip_votes_and_events.rb

@@ -1,36 +0,0 @@
-class CreateTheatreSkipVotesAndEvents < ActiveRecord::Migration[8.0]
-  def change
-    create_table :theatre_skip_votes, primary_key: [:theatre_id, :post_id, :user_id] do |t|
-      t.references :theatre, null: false, foreign_key: true
-      t.references :post, null: false, foreign_key: true
-      t.references :user, null: false, foreign_key: true
-      t.timestamps
-    end
-
-    create_table :theatre_skip_events do |t|
-      t.references :theatre, null: false, foreign_key: true
-      t.references :post, null: false, foreign_key: true
-      t.references :skipped_by_user, null: false, foreign_key: { to_table: :users }
-      t.integer :programme_position
-      t.datetime :created_at, null: false
-    end
-
-    create_table :theatre_skip_event_voters, primary_key: [:theatre_skip_event_id, :user_id] do |t|
-      t.references :theatre_skip_event, null: false, foreign_key: true
-      t.references :user, null: false, foreign_key: true
-    end
-
-    create_table :theatre_skip_event_tags, primary_key: [:theatre_skip_event_id, :tag_id] do |t|
-      t.references :theatre_skip_event, null: false, foreign_key: true
-      t.references :tag, null: false, foreign_key: true
-    end
-
-    add_index :theatre_skip_events, [:theatre_id, :created_at]
-    add_index :theatre_skip_votes, [:theatre_id, :post_id, :created_at],
-              name: 'idx_theatre_skip_votes_theatre_post_created'
-    add_index :theatre_skip_event_voters, [:user_id, :theatre_skip_event_id],
-              name: 'idx_theatre_skip_event_voters_user_event'
-    add_index :theatre_skip_event_tags, [:tag_id, :theatre_skip_event_id],
-              name: 'idx_theatre_skip_event_tags_tag_event'
-  end
-end

backend/db/migrate/20260607000000_create_gekanator_games.rb

@@ -1,18 +0,0 @@
-class CreateGekanatorGames < ActiveRecord::Migration[8.0]
-  def change
-    create_table :gekanator_games do |t|
-      t.references :user, null: false, foreign_key: true
-      t.references :guessed_post, null: false, foreign_key: { to_table: :posts }
-      t.references :correct_post, null: false, foreign_key: { to_table: :posts }
-      t.boolean :won, null: false
-      t.integer :question_count, null: false
-      t.json :answers, null: false
-
-      t.timestamps
-    end
-
-    add_check_constraint :gekanator_games,
-                         'question_count >= 0',
-                         name: 'chk_gekanator_games_question_count_nonnegative'
-  end
-end

backend/db/migrate/20260608000000_create_gekanator_question_suggestions.rb

@@ -1,14 +0,0 @@
-class CreateGekanatorQuestionSuggestions < ActiveRecord::Migration[8.0]
-  def change
-    create_table :gekanator_question_suggestions do |t|
-      t.references :gekanator_game,
-                   null: false,
-                   foreign_key: { on_delete: :cascade }
-      t.references :user, null: false, foreign_key: true
-      t.text :question_text, null: false
-      t.boolean :processed, null: false, default: false
-
-      t.timestamps
-    end
-  end
-end

backend/db/migrate/20260608002000_add_answer_to_gekanator_question_suggestions.rb

@@ -1,5 +0,0 @@
-class AddAnswerToGekanatorQuestionSuggestions < ActiveRecord::Migration[8.0]
-  def change
-    add_column :gekanator_question_suggestions, :answer, :string, null: false
-  end
-end

backend/db/migrate/20260609000000_create_gekanator_questions.rb

@@ -1,19 +0,0 @@
-class CreateGekanatorQuestions < ActiveRecord::Migration[8.0]
-  def change
-    create_table :gekanator_questions do |t|
-      t.string :text, null: false
-      t.string :kind, null: false
-      t.json :condition, null: false
-      t.string :source, null: false, default: 'ai_generated'
-      t.string :status, null: false, default: 'pending'
-      t.float :priority_weight, null: false, default: 1.0
-      t.references :gekanator_question_suggestion,
-                   null: true,
-                   foreign_key: true
-      t.references :created_by,
-                   null: true,
-                   foreign_key: { to_table: :users }
-      t.timestamps
-    end
-  end
-end

backend/db/migrate/20260609001000_create_gekanator_ai_runs.rb

@@ -1,13 +0,0 @@
-class CreateGekanatorAiRuns < ActiveRecord::Migration[8.0]
-  def change
-    create_table :gekanator_ai_runs do |t|
-      t.string :model, null: false
-      t.integer :input_tokens, null: false, default: 0
-      t.integer :output_tokens, null: false, default: 0
-      t.decimal :estimated_cost_jpy, precision: 8, scale: 3, null: false, default: 0
-      t.string :status, null: false, default: 'pending'
-      t.references :gekanator_question_suggestion, null: false, foreign_key: true
-      t.timestamps
-    end
-  end
-end

backend/db/migrate/20260610000000_create_gekanator_question_examples.rb

@@ -1,19 +0,0 @@
-class CreateGekanatorQuestionExamples < ActiveRecord::Migration[8.0]
-  def change
-    create_table :gekanator_question_examples do |t|
-      t.references :gekanator_question, null: false, foreign_key: true
-      t.references :post, null: false, foreign_key: true
-      t.references :user, null: false, foreign_key: true
-      t.references :gekanator_game, null: true, foreign_key: true
-      t.string :answer, null: false
-      t.string :source, null: false, default: 'post_game_extra'
-      t.float :weight, null: false, default: 1.0
-      t.timestamps
-    end
-
-    add_index :gekanator_question_examples,
-              [:gekanator_question_id, :post_id, :user_id],
-              unique: true,
-              name: 'idx_gekanator_question_examples_on_question_post_user'
-  end
-end

backend/db/migrate/20260612000000_add_answer_statistics_to_gekanator_question_examples.rb

@@ -1,40 +0,0 @@
-class AddAnswerStatisticsToGekanatorQuestionExamples < ActiveRecord::Migration[8.0]
-  class MigrationGekanatorQuestionExample < ApplicationRecord
-    self.table_name = 'gekanator_question_examples'
-  end
-
-  def up
-    add_column :gekanator_question_examples,
-               :answer_counts,
-               :json,
-               null: true
-    add_column :gekanator_question_examples,
-               :sample_count,
-               :integer,
-               null: false,
-               default: 1
-
-    MigrationGekanatorQuestionExample.reset_column_information
-    MigrationGekanatorQuestionExample.find_each do |example|
-      counts = {
-        'yes' => 0,
-        'no' => 0,
-        'partial' => 0,
-        'probably_no' => 0,
-        'unknown' => 0
-      }
-      counts[example.answer] = 1 if counts.key?(example.answer)
-
-      example.update_columns(
-        answer_counts: counts,
-        sample_count: 1)
-    end
-
-    change_column_null :gekanator_question_examples, :answer_counts, false
-  end
-
-  def down
-    remove_column :gekanator_question_examples, :sample_count
-    remove_column :gekanator_question_examples, :answer_counts
-  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_06_12_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_05_07_213300) 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
@@ -48,79 +48,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
     t.index ["tag_id"], name: "index_deerjikists_on_tag_id"
   end
 
-  create_table "gekanator_ai_runs", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "model", null: false
-    t.integer "input_tokens", default: 0, null: false
-    t.integer "output_tokens", default: 0, null: false
-    t.decimal "estimated_cost_jpy", precision: 8, scale: 3, default: "0.0", null: false
-    t.string "status", default: "pending", null: false
-    t.bigint "gekanator_question_suggestion_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["gekanator_question_suggestion_id"], name: "index_gekanator_ai_runs_on_gekanator_question_suggestion_id"
-  end
-
-  create_table "gekanator_games", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "user_id", null: false
-    t.bigint "guessed_post_id", null: false
-    t.bigint "correct_post_id", null: false
-    t.boolean "won", null: false
-    t.integer "question_count", null: false
-    t.json "answers", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["correct_post_id"], name: "index_gekanator_games_on_correct_post_id"
-    t.index ["guessed_post_id"], name: "index_gekanator_games_on_guessed_post_id"
-    t.index ["user_id"], name: "index_gekanator_games_on_user_id"
-    t.check_constraint "`question_count` >= 0", name: "chk_gekanator_games_question_count_nonnegative"
-  end
-
-  create_table "gekanator_question_examples", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "gekanator_question_id", null: false
-    t.bigint "post_id", null: false
-    t.bigint "user_id", null: false
-    t.bigint "gekanator_game_id"
-    t.string "answer", null: false
-    t.string "source", default: "post_game_extra", null: false
-    t.float "weight", default: 1.0, null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.json "answer_counts", null: false
-    t.integer "sample_count", default: 1, null: false
-    t.index ["gekanator_game_id"], name: "index_gekanator_question_examples_on_gekanator_game_id"
-    t.index ["gekanator_question_id", "post_id", "user_id"], name: "idx_gekanator_question_examples_on_question_post_user", unique: true
-    t.index ["gekanator_question_id"], name: "index_gekanator_question_examples_on_gekanator_question_id"
-    t.index ["post_id"], name: "index_gekanator_question_examples_on_post_id"
-    t.index ["user_id"], name: "index_gekanator_question_examples_on_user_id"
-  end
-
-  create_table "gekanator_question_suggestions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "gekanator_game_id", null: false
-    t.bigint "user_id", null: false
-    t.text "question_text", null: false
-    t.boolean "processed", default: false, null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.string "answer", null: false
-    t.index ["gekanator_game_id"], name: "index_gekanator_question_suggestions_on_gekanator_game_id"
-    t.index ["user_id"], name: "index_gekanator_question_suggestions_on_user_id"
-  end
-
-  create_table "gekanator_questions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "text", null: false
-    t.string "kind", null: false
-    t.json "condition", null: false
-    t.string "source", default: "ai_generated", null: false
-    t.string "status", default: "pending", null: false
-    t.float "priority_weight", default: 1.0, null: false
-    t.bigint "gekanator_question_suggestion_id"
-    t.bigint "created_by_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_id"], name: "index_gekanator_questions_on_created_by_id"
-    t.index ["gekanator_question_suggestion_id"], name: "index_gekanator_questions_on_gekanator_question_suggestion_id"
-  end
-
   create_table "ip_addresses", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.binary "ip_address", limit: 16, null: false
     t.datetime "banned_at"
@@ -356,55 +283,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
     t.index ["user_id"], name: "index_theatre_comments_on_user_id"
   end
 
-  create_table "theatre_programmes", primary_key: ["theatre_id", "position"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.integer "position", null: false
-    t.bigint "post_id", null: false
-    t.datetime "created_at", null: false
-    t.index ["post_id"], name: "index_theatre_programmes_on_post_id"
-    t.index ["theatre_id"], name: "index_theatre_programmes_on_theatre_id"
-  end
-
-  create_table "theatre_skip_event_tags", primary_key: ["theatre_skip_event_id", "tag_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_skip_event_id", null: false
-    t.bigint "tag_id", null: false
-    t.index ["tag_id", "theatre_skip_event_id"], name: "idx_theatre_skip_event_tags_tag_event"
-    t.index ["tag_id"], name: "index_theatre_skip_event_tags_on_tag_id"
-    t.index ["theatre_skip_event_id"], name: "index_theatre_skip_event_tags_on_theatre_skip_event_id"
-  end
-
-  create_table "theatre_skip_event_voters", primary_key: ["theatre_skip_event_id", "user_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_skip_event_id", null: false
-    t.bigint "user_id", null: false
-    t.index ["theatre_skip_event_id"], name: "index_theatre_skip_event_voters_on_theatre_skip_event_id"
-    t.index ["user_id", "theatre_skip_event_id"], name: "idx_theatre_skip_event_voters_user_event"
-    t.index ["user_id"], name: "index_theatre_skip_event_voters_on_user_id"
-  end
-
-  create_table "theatre_skip_events", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.bigint "post_id", null: false
-    t.bigint "skipped_by_user_id", null: false
-    t.integer "programme_position"
-    t.datetime "created_at", null: false
-    t.index ["post_id"], name: "index_theatre_skip_events_on_post_id"
-    t.index ["skipped_by_user_id"], name: "index_theatre_skip_events_on_skipped_by_user_id"
-    t.index ["theatre_id", "created_at"], name: "index_theatre_skip_events_on_theatre_id_and_created_at"
-    t.index ["theatre_id"], name: "index_theatre_skip_events_on_theatre_id"
-  end
-
-  create_table "theatre_skip_votes", primary_key: ["theatre_id", "post_id", "user_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "theatre_id", null: false
-    t.bigint "post_id", null: false
-    t.bigint "user_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["post_id"], name: "index_theatre_skip_votes_on_post_id"
-    t.index ["theatre_id", "post_id", "created_at"], name: "idx_theatre_skip_votes_theatre_post_created"
-    t.index ["theatre_id"], name: "index_theatre_skip_votes_on_theatre_id"
-    t.index ["user_id"], name: "index_theatre_skip_votes_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
@@ -551,18 +429,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) 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 "gekanator_ai_runs", "gekanator_question_suggestions"
-  add_foreign_key "gekanator_games", "posts", column: "correct_post_id"
-  add_foreign_key "gekanator_games", "posts", column: "guessed_post_id"
-  add_foreign_key "gekanator_games", "users"
-  add_foreign_key "gekanator_question_examples", "gekanator_games"
-  add_foreign_key "gekanator_question_examples", "gekanator_questions"
-  add_foreign_key "gekanator_question_examples", "posts"
-  add_foreign_key "gekanator_question_examples", "users"
-  add_foreign_key "gekanator_question_suggestions", "gekanator_games", on_delete: :cascade
-  add_foreign_key "gekanator_question_suggestions", "users"
-  add_foreign_key "gekanator_questions", "gekanator_question_suggestions"
-  add_foreign_key "gekanator_questions", "users", column: "created_by_id"
   add_foreign_key "material_versions", "materials"
   add_foreign_key "material_versions", "materials", column: "parent_id"
   add_foreign_key "material_versions", "tags"
@@ -598,18 +464,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
   add_foreign_key "tags", "tag_names"
   add_foreign_key "theatre_comments", "theatres"
   add_foreign_key "theatre_comments", "users"
-  add_foreign_key "theatre_programmes", "posts"
-  add_foreign_key "theatre_programmes", "theatres"
-  add_foreign_key "theatre_skip_event_tags", "tags"
-  add_foreign_key "theatre_skip_event_tags", "theatre_skip_events"
-  add_foreign_key "theatre_skip_event_voters", "theatre_skip_events"
-  add_foreign_key "theatre_skip_event_voters", "users"
-  add_foreign_key "theatre_skip_events", "posts"
-  add_foreign_key "theatre_skip_events", "theatres"
-  add_foreign_key "theatre_skip_events", "users", column: "skipped_by_user_id"
-  add_foreign_key "theatre_skip_votes", "posts"
-  add_foreign_key "theatre_skip_votes", "theatres"
-  add_foreign_key "theatre_skip_votes", "users"
   add_foreign_key "theatre_watching_users", "theatres"
   add_foreign_key "theatre_watching_users", "users"
   add_foreign_key "theatres", "posts", column: "current_post_id"

backend/spec/requests/gekanator_games_spec.rb

@@ -1,75 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Gekanator games API', type: :request do
-  let!(:admin) { create_admin_user! }
-  let!(:user) { create_member_user! }
-  let!(:guessed_post) { Post.create!(title: 'guess', url: 'https://example.com/guess') }
-  let!(:correct_post) { Post.create!(title: 'correct', url: 'https://example.com/correct') }
-
-  describe 'POST /gekanator/games' do
-    it 'stores a won game' do
-      sign_in_as admin
-
-      post '/gekanator/games', params: {
-          guessed_post_id: guessed_post.id,
-          correct_post_id: guessed_post.id,
-          answers: [{ question_id: 'tag:1', answer: 'yes' }] }
-
-      expect(response).to have_http_status(:created)
-      game = GekanatorGame.find(json['id'])
-      expect(game.user).to eq(admin)
-      expect(game.guessed_post).to eq(guessed_post)
-      expect(game.correct_post).to eq(guessed_post)
-      expect(game.won).to eq(true)
-      expect(game.question_count).to eq(1)
-      expect(game.answers).to eq([{ 'question_id' => 'tag:1', 'answer' => 'yes' }])
-    end
-
-    it 'stores a lost game with the correct post' do
-      sign_in_as admin
-
-      post '/gekanator/games', params: {
-          guessed_post_id: guessed_post.id,
-          correct_post_id: correct_post.id,
-          question_count: 4,
-          answers: [{ question_id: 'tag:1', answer: 'no' }] }
-
-      expect(response).to have_http_status(:created)
-      game = GekanatorGame.find(json['id'])
-      expect(game.correct_post).to eq(correct_post)
-      expect(game.won).to eq(false)
-      expect(game.question_count).to eq(1)
-    end
-
-    it 'rejects a game without the correct post' do
-      sign_in_as admin
-
-      post '/gekanator/games', params: {
-          guessed_post_id: guessed_post.id,
-          question_count: 4,
-          answers: [{ question_id: 'tag:1', answer: 'no' }] }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'returns not found without an admin user' do
-      post '/gekanator/games', params: {
-          guessed_post_id: guessed_post.id,
-          correct_post_id: guessed_post.id,
-          answers: [] }
-
-      expect(response).to have_http_status(:not_found)
-    end
-
-    it 'returns not found for a non-admin user' do
-      sign_in_as user
-
-      post '/gekanator/games', params: {
-          guessed_post_id: guessed_post.id,
-          correct_post_id: guessed_post.id,
-          answers: [{ question_id: 'tag:1', answer: 'yes' }] }
-
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-end

backend/spec/requests/gekanator_learning_spec.rb

@@ -1,612 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Gekanator learning API', type: :request do
-  let(:admin) { create(:user, :admin) }
-  let(:member) { create(:user, :member) }
-  let(:other_user) { create(:user, :member) }
-
-  let!(:guessed_post) do
-    Post.create!(
-      title: 'guessed',
-      url: 'https://example.com/guessed'
-    )
-  end
-
-  let!(:correct_post) do
-    Post.create!(
-      title: 'correct',
-      url: 'https://example.com/correct'
-    )
-  end
-
-  let!(:other_post) do
-    Post.create!(
-      title: 'other',
-      url: 'https://example.com/other'
-    )
-  end
-
-  let!(:game) do
-    GekanatorGame.create!(
-      user: admin,
-      guessed_post: guessed_post,
-      correct_post: correct_post,
-      won: false,
-      question_count: 1,
-      answers: [
-        {
-          'question_id' => 'tag:character:喜多郁代',
-          'question_text' => '喜多ちゃんが関係してる?',
-          'answer' => 'yes',
-          'original_answer' => 'yes'
-        }
-      ]
-    )
-  end
-
-  def create_post_similarity_question!(
-    text: '喜多ちゃんが泣いてる?',
-    post: correct_post,
-    answer: 'yes',
-    status: 'accepted',
-    source: 'user_suggested',
-    priority_weight: 1.2
-  )
-    GekanatorQuestion.create!(
-      text: text,
-      kind: 'post_similarity',
-      source: source,
-      status: status,
-      priority_weight: priority_weight,
-      condition: {
-        type: 'post-similarity',
-        postId: post.id,
-        answer: answer,
-        threshold: 0.65
-      },
-      created_by: admin
-    )
-  end
-
-  describe 'POST /gekanator/games' do
-    it 'stores a game result for an admin user' do
-      sign_in_as admin
-
-      post '/gekanator/games', params: {
-        guessed_post_id: guessed_post.id,
-        correct_post_id: correct_post.id,
-        answers: [
-          {
-            question_id: 'tag:character:喜多郁代',
-            question_text: '喜多ちゃんが関係してる?',
-            answer: 'yes',
-            original_answer: 'yes'
-          }
-        ]
-      }
-
-      expect(response).to have_http_status(:created)
-
-      created = GekanatorGame.find(json['id'])
-      expect(created.user).to eq(admin)
-      expect(created.guessed_post).to eq(guessed_post)
-      expect(created.correct_post).to eq(correct_post)
-      expect(created.won).to eq(false)
-      expect(created.question_count).to eq(1)
-      expect(created.answers).to eq([
-        {
-          'question_id' => 'tag:character:喜多郁代',
-          'question_text' => '喜多ちゃんが関係してる?',
-          'answer' => 'yes',
-          'original_answer' => 'yes'
-        }
-      ])
-    end
-
-    it 'stores a won game when guessed_post_id equals correct_post_id' do
-      sign_in_as admin
-
-      post '/gekanator/games', params: {
-        guessed_post_id: correct_post.id,
-        correct_post_id: correct_post.id,
-        answers: []
-      }
-
-      expect(response).to have_http_status(:created)
-      expect(GekanatorGame.find(json['id']).won).to eq(true)
-    end
-
-    it 'rejects a game without correct_post_id' do
-      sign_in_as admin
-
-      expect {
-        post '/gekanator/games', params: {
-          guessed_post_id: guessed_post.id,
-          answers: []
-        }
-      }.not_to change { GekanatorGame.count }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'returns not found for a non-admin user' do
-      sign_in_as member
-
-      post '/gekanator/games', params: {
-        guessed_post_id: guessed_post.id,
-        correct_post_id: correct_post.id,
-        answers: []
-      }
-
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  describe 'POST /gekanator/question_suggestions' do
-    it 'creates a suggestion and promotes yes answer to an accepted post_similarity question' do
-      sign_in_as admin
-
-      expect {
-        post '/gekanator/question_suggestions', params: {
-          gekanator_game_id: game.id,
-          question_text: '喜多ちゃんが泣いてる?',
-          answer: 'yes'
-        }
-      }.to change { GekanatorQuestionSuggestion.count }.by(1)
-        .and change { GekanatorQuestion.count }.by(1)
-        .and change { GekanatorQuestionExample.count }.by(1)
-
-      expect(response).to have_http_status(:created)
-
-      suggestion = GekanatorQuestionSuggestion.last
-      question = GekanatorQuestion.last
-      example = GekanatorQuestionExample.last
-
-      expect(json).to include(
-        'id' => suggestion.id,
-        'count' => 1
-      )
-
-      expect(suggestion).to have_attributes(
-        gekanator_game_id: game.id,
-        user_id: admin.id,
-        question_text: '喜多ちゃんが泣いてる?',
-        answer: 'yes',
-        processed: true
-      )
-
-      expect(question).to have_attributes(
-        text: '喜多ちゃんが泣いてる?',
-        kind: 'post_similarity',
-        source: 'user_suggested',
-        status: 'accepted',
-        priority_weight: 1.2,
-        gekanator_question_suggestion_id: suggestion.id,
-        created_by_id: admin.id
-      )
-      expect(question.condition).to include(
-        'type' => 'post-similarity',
-        'postId' => correct_post.id,
-        'answer' => 'yes',
-        'threshold' => 0.65
-      )
-
-      expect(example).to have_attributes(
-        gekanator_question_id: question.id,
-        post_id: correct_post.id,
-        user_id: admin.id,
-        gekanator_game_id: game.id,
-        answer: 'yes',
-        source: 'initial_suggestion',
-        weight: 1.0
-      )
-    end
-
-    it 'promotes no, partial, and probably_no answers' do
-      sign_in_as admin
-
-      ['no', 'partial', 'probably_no'].each do |answer|
-        expect {
-          post '/gekanator/question_suggestions', params: {
-            gekanator_game_id: game.id,
-            question_text: "answer #{answer} question?",
-            answer: answer
-          }
-        }.to change { GekanatorQuestion.count }.by(1)
-          .and change { GekanatorQuestionExample.count }.by(1)
-
-        expect(response).to have_http_status(:created)
-        expect(GekanatorQuestion.last.condition['answer']).to eq(answer)
-        expect(GekanatorQuestionExample.last.answer).to eq(answer)
-      end
-    end
-
-    it 'does not promote unknown answers' do
-      sign_in_as admin
-
-      expect {
-        post '/gekanator/question_suggestions', params: {
-          gekanator_game_id: game.id,
-          question_text: 'よく分からない質問?',
-          answer: 'unknown'
-        }
-      }.to change { GekanatorQuestionSuggestion.count }.by(1)
-        .and change { GekanatorQuestion.count }.by(0)
-        .and change { GekanatorQuestionExample.count }.by(0)
-
-      expect(response).to have_http_status(:created)
-      expect(GekanatorQuestionSuggestion.last.processed).to eq(false)
-    end
-
-    it 'limits suggestions to three per game' do
-      sign_in_as admin
-
-      3.times do |i|
-        GekanatorQuestionSuggestion.create!(
-          gekanator_game: game,
-          user: admin,
-          question_text: "existing question #{i}",
-          answer: 'unknown'
-        )
-      end
-
-      expect {
-        post '/gekanator/question_suggestions', params: {
-          gekanator_game_id: game.id,
-          question_text: 'fourth question?',
-          answer: 'yes'
-        }
-      }.not_to change { GekanatorQuestionSuggestion.count }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'returns not found for a non-admin user' do
-      sign_in_as member
-
-      post '/gekanator/question_suggestions', params: {
-        gekanator_game_id: game.id,
-        question_text: 'member question?',
-        answer: 'yes'
-      }
-
-      expect(response).to have_http_status(:not_found)
-    end
-  end
-
-  describe 'GET /gekanator/games/:id/extra_questions' do
-    it 'returns at most two accepted user_suggested post_similarity questions without duplicates' do
-      sign_in_as admin
-
-      low = create_post_similarity_question!(
-        text: 'low?',
-        priority_weight: 1.0
-      )
-      high = create_post_similarity_question!(
-        text: 'high?',
-        priority_weight: 3.0
-      )
-      middle = create_post_similarity_question!(
-        text: 'middle?',
-        priority_weight: 2.0
-      )
-
-      get "/gekanator/games/#{game.id}/extra_questions"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['questions'].length).to eq(2)
-      expect(json['questions'].map { _1['id'] }.uniq.length).to eq(2)
-      expect(json['questions'].map { _1['id'] }).to all(be_in([low.id, high.id, middle.id]))
-    end
-
-    it 'can return questions that already have an example for the correct post' do
-      sign_in_as admin
-
-      existing = create_post_similarity_question!(text: 'already learned?')
-
-      GekanatorQuestionExample.create!(
-        gekanator_question: existing,
-        post: correct_post,
-        user: admin,
-        gekanator_game: game,
-        answer: 'yes',
-        source: 'post_game_extra'
-      )
-
-      get "/gekanator/games/#{game.id}/extra_questions"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['questions'].map { _1['id'] }).to include(existing.id)
-    end
-
-    it 'can return questions already asked in the game using snake_case question_id' do
-      sign_in_as admin
-
-      asked = create_post_similarity_question!(text: 'already asked?')
-      game.update!(
-        answers: [
-          {
-            'question_id' => "post-similarity:#{asked.id}",
-            'answer' => 'yes'
-          }
-        ]
-      )
-
-      get "/gekanator/games/#{game.id}/extra_questions"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['questions'].map { _1['id'] }).to include(asked.id)
-    end
-
-    it 'can return questions already asked in the game using camelCase questionId' do
-      sign_in_as admin
-
-      asked = create_post_similarity_question!(text: 'already asked?')
-      game.update!(
-        answers: [
-          {
-            'questionId' => "post-similarity:#{asked.id}",
-            'answer' => 'yes'
-          }
-        ]
-      )
-
-      get "/gekanator/games/#{game.id}/extra_questions"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['questions'].map { _1['id'] }).to include(asked.id)
-    end
-
-    it 'does not return non-accepted, non-user_suggested, or non-post_similarity questions' do
-      sign_in_as admin
-
-      accepted = create_post_similarity_question!(text: 'accepted?')
-      create_post_similarity_question!(text: 'disabled?', status: 'disabled')
-      create_post_similarity_question!(text: 'ai?', source: 'ai_generated')
-      GekanatorQuestion.create!(
-        text: 'tag?',
-        kind: 'tag',
-        source: 'user_suggested',
-        status: 'accepted',
-        priority_weight: 1.0,
-        condition: { type: 'tag', key: 'character:喜多郁代' }
-      )
-
-      get "/gekanator/games/#{game.id}/extra_questions"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['questions'].map { _1['id'] }).to contain_exactly(accepted.id)
-    end
-  end
-
-  describe 'POST /gekanator/games/:id/extra_question_answers' do
-    it 'creates examples for extra question answers' do
-      sign_in_as admin
-
-      question = create_post_similarity_question!(text: 'extra?')
-
-      expect {
-        post "/gekanator/games/#{game.id}/extra_question_answers", params: {
-          answers: [
-            {
-              question_id: question.id.to_s,
-              answer: 'partial'
-            }
-          ]
-        }
-      }.to change { GekanatorQuestionExample.count }.by(1)
-
-      expect(response).to have_http_status(:created)
-      expect(json).to include('count' => 1)
-
-      example = GekanatorQuestionExample.last
-      expect(example).to have_attributes(
-        gekanator_question_id: question.id,
-        post_id: correct_post.id,
-        user_id: admin.id,
-        gekanator_game_id: game.id,
-        answer: 'partial',
-        source: 'post_game_extra',
-        weight: 1.0
-      )
-    end
-
-    it 'updates an existing example for the same question, post, and user' do
-      sign_in_as admin
-
-      question = create_post_similarity_question!(text: 'extra?')
-      existing = GekanatorQuestionExample.create!(
-        gekanator_question: question,
-        post: correct_post,
-        user: admin,
-        answer: 'no',
-        source: 'post_game_extra',
-        weight: 1.0
-      )
-
-      expect {
-        post "/gekanator/games/#{game.id}/extra_question_answers", params: {
-          answers: [
-            {
-              question_id: question.id,
-              answer: 'yes'
-            }
-          ]
-        }
-      }.not_to change { GekanatorQuestionExample.count }
-
-      expect(response).to have_http_status(:created)
-      expect(existing.reload).to have_attributes(
-        answer: 'yes',
-        source: 'post_game_extra',
-        gekanator_game_id: game.id
-      )
-    end
-
-    it 'rejects missing questions' do
-      sign_in_as admin
-
-      expect {
-        post "/gekanator/games/#{game.id}/extra_question_answers", params: {
-          answers: [
-            {
-              question_id: 999_999_999,
-              answer: 'yes'
-            }
-          ]
-        }
-      }.not_to change { GekanatorQuestionExample.count }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'rejects non-accepted questions' do
-      sign_in_as admin
-
-      question = create_post_similarity_question!(
-        text: 'disabled?',
-        status: 'disabled'
-      )
-
-      post "/gekanator/games/#{game.id}/extra_question_answers", params: {
-        answers: [
-          {
-            question_id: question.id,
-            answer: 'yes'
-          }
-        ]
-      }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'rejects non-post_similarity questions' do
-      sign_in_as admin
-
-      question = GekanatorQuestion.create!(
-        text: 'tag?',
-        kind: 'tag',
-        source: 'user_suggested',
-        status: 'accepted',
-        priority_weight: 1.0,
-        condition: { type: 'tag', key: 'character:喜多郁代' }
-      )
-
-      post "/gekanator/games/#{game.id}/extra_question_answers", params: {
-        answers: [
-          {
-            question_id: question.id,
-            answer: 'yes'
-          }
-        ]
-      }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-  end
-
-  describe 'GET /gekanator/questions' do
-    it 'returns accepted questions only and includes example_answers for post_similarity questions' do
-      sign_in_as admin
-
-      accepted = create_post_similarity_question!(text: 'accepted?')
-      create_post_similarity_question!(
-        text: 'disabled?',
-        status: 'disabled'
-      )
-
-      GekanatorQuestionExample.create!(
-        gekanator_question: accepted,
-        post: correct_post,
-        user: admin,
-        answer: 'yes',
-        source: 'initial_suggestion',
-        weight: 1.0
-      )
-
-      get '/gekanator/questions'
-
-      expect(response).to have_http_status(:ok)
-      expect(json['questions'].length).to eq(1)
-
-      question_json = json['questions'].first
-      expect(question_json).to include(
-        'id' => "post-similarity:#{accepted.id}",
-        'text' => 'accepted?',
-        'kind' => 'post_similarity',
-        'source' => 'user_suggested',
-        'priority_weight' => 1.2
-      )
-      expect(question_json['condition']).to include(
-        'type' => 'post-similarity',
-        'postId' => correct_post.id,
-        'answer' => 'yes',
-        'threshold' => 0.65
-      )
-      expect(question_json['example_answers']).to include(
-        correct_post.id.to_s => 'yes'
-      )
-    end
-
-    it 'aggregates example_answers by weight' do
-      sign_in_as admin
-
-      question = create_post_similarity_question!(text: 'weighted?')
-
-      GekanatorQuestionExample.create!(
-        gekanator_question: question,
-        post: other_post,
-        user: admin,
-        answer: 'yes',
-        source: 'post_game_extra',
-        weight: 1.0
-      )
-      GekanatorQuestionExample.create!(
-        gekanator_question: question,
-        post: other_post,
-        user: other_user,
-        answer: 'no',
-        source: 'post_game_extra',
-        weight: 2.0
-      )
-
-      get '/gekanator/questions'
-
-      expect(response).to have_http_status(:ok)
-      question_json = json['questions'].find { _1['id'] == "post-similarity:#{question.id}" }
-      expect(question_json['example_answers']).to include(
-        other_post.id.to_s => 'no'
-      )
-    end
-
-    it 'normalizes legacy title length questions' do
-      sign_in_as admin
-
-      GekanatorQuestion.create!(
-        text: '題名が長めの投稿?',
-        kind: 'title',
-        source: 'admin_curated',
-        status: 'accepted',
-        priority_weight: 1.0,
-        condition: {
-          type: 'title-length-greater-than',
-          length: 20
-        },
-        created_by: admin
-      )
-
-      get '/gekanator/questions'
-
-      expect(response).to have_http_status(:ok)
-      question_json = json['questions'].find { _1['id'] == 'title:length-at-least:21' }
-      expect(question_json).to include(
-        'text' => 'タイトルは 21 文字以上?',
-        'kind' => 'title'
-      )
-      expect(question_json['condition']).to include(
-        'type' => 'title-length-at-least',
-        'length' => 21
-      )
-    end
-  end
-end

backend/spec/requests/theatre_comments_spec.rb

@@ -80,26 +80,6 @@ RSpec.describe 'TheatreComments', type: :request do
       expect(response).to have_http_status(:ok)
       expect(response.parsed_body.map { |row| row['no'] }).to eq([3, 2, 1])
     end
-
-    it '削除済みコメントは deleted として返し、本文を隠す' do
-      comment_2.discard!
-
-      get "/theatres/#{theatre.id}/comments", params: { no_gt: 1 }
-
-      expect(response).to have_http_status(:ok)
-
-      deleted_comment = response.parsed_body.find { _1['no'] == 2 }
-      expect(deleted_comment).to include(
-        'deleted' => true,
-        'content' => nil
-      )
-
-      visible_comment = response.parsed_body.find { _1['no'] == 3 }
-      expect(visible_comment).to include(
-        'deleted' => false,
-        'content' => 'third comment'
-      )
-    end
   end
 
   describe 'POST /theatres/:theatre_id/comments' do
@@ -167,44 +147,4 @@ RSpec.describe 'TheatreComments', type: :request do
       })
     end
   end
-
-  describe 'DELETE /theatres/:theatre_id/comments/:id' do
-    let(:theatre) { create(:theatre) }
-    let(:alice) { create(:user, name: 'Alice') }
-    let(:bob) { create(:user, name: 'Bob') }
-    let!(:comment) do
-      create(
-        :theatre_comment,
-        theatre: theatre,
-        no: 1,
-        user: alice,
-        content: 'delete target'
-      )
-    end
-
-    it 'returns 401 when not logged in' do
-      delete "/theatres/#{theatre.id}/comments/#{comment.no}"
-
-      expect(response).to have_http_status(:unauthorized)
-      expect(comment.reload.discarded?).to eq(false)
-    end
-
-    it 'allows the comment owner to delete it' do
-      sign_in_as(alice)
-
-      delete "/theatres/#{theatre.id}/comments/#{comment.no}"
-
-      expect(response).to have_http_status(:no_content)
-      expect(comment.reload.discarded?).to eq(true)
-    end
-
-    it 'returns 403 when another user tries to delete it' do
-      sign_in_as(bob)
-
-      delete "/theatres/#{theatre.id}/comments/#{comment.no}"
-
-      expect(response).to have_http_status(:forbidden)
-      expect(comment.reload.discarded?).to eq(false)
-    end
-  end
 end

backend/spec/requests/theatre_programmes_spec.rb

@@ -1,38 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'TheatreProgrammes', type: :request do
-  describe 'GET /theatres/:theatre_id/programmes' do
-    let(:theatre) { create(:theatre) }
-    let(:other_theatre) { create(:theatre) }
-    let(:post_1) { Post.create!(title: 'first', url: 'https://www.nicovideo.jp/watch/sm1') }
-    let(:post_2) { Post.create!(title: 'second', url: 'https://www.nicovideo.jp/watch/sm2') }
-    let(:other_post) { Post.create!(title: 'other', url: 'https://www.nicovideo.jp/watch/sm3') }
-
-    before do
-      TheatreProgramme.create!(theatre:, position: 1, post: post_1, created_at: 2.minutes.ago)
-      TheatreProgramme.create!(theatre:, position: 2, post: post_2, created_at: 1.minute.ago)
-      TheatreProgramme.create!(
-        theatre: other_theatre,
-        position: 1,
-        post: other_post,
-        created_at: 1.minute.ago
-      )
-    end
-
-    it 'returns programmes for the theatre in descending position with post json' do
-      get "/theatres/#{theatre.id}/programmes"
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { _1['position'] }).to eq([2, 1])
-      expect(json.map { _1.dig('post', 'title') }).to eq(['second', 'first'])
-      expect(json.first['post']).to include('id' => post_2.id, 'url' => post_2.url)
-    end
-
-    it 'filters programmes by position_gt' do
-      get "/theatres/#{theatre.id}/programmes", params: { position_gt: 1 }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { _1['position'] }).to eq([2])
-    end
-  end
-end

backend/spec/requests/theatres_spec.rb

@@ -14,24 +14,10 @@ RSpec.describe 'Theatres API', type: :request do
   let(:member) { create(:user, :member, name: 'member user') }
   let(:other_user) { create(:user, :member, name: 'other user') }
 
-  let!(:niconico_post) do
-    Post.create!(
-      title: 'niconico post',
-      url: 'https://www.nicovideo.jp/watch/sm123'
-    )
-  end
-
-  let!(:second_niconico_post) do
-    Post.create!(
-      title: 'second niconico post',
-      url: 'https://www.nicovideo.jp/watch/sm456'
-    )
-  end
-
   let!(:youtube_post) do
     Post.create!(
       title: 'youtube post',
-      url: 'https://www.youtube.com/watch?v=yt123'
+      url: 'https://www.youtube.com/watch?v=spec123'
     )
   end
 
@@ -134,8 +120,7 @@ RSpec.describe 'Theatres API', type: :request do
         expect(json).to include(
           'host_flg' => true,
           'post_id' => nil,
-          'post_started_at' => nil,
-          'post_elapsed_ms' => nil
+          'post_started_at' => nil
         )
 
         expect(json.fetch('watching_users')).to contain_exactly(
@@ -192,8 +177,7 @@ RSpec.describe 'Theatres API', type: :request do
         expect(json).to include(
           'host_flg' => false,
           'post_id' => nil,
-          'post_started_at' => nil,
-          'post_elapsed_ms' => nil
+          'post_started_at' => nil
         )
 
         expect(json.fetch('watching_users')).to contain_exactly(
@@ -220,7 +204,7 @@ RSpec.describe 'Theatres API', type: :request do
         )
         theatre.update!(
           host_user: other_user,
-          current_post: niconico_post,
+          current_post: youtube_post,
           current_post_started_at: started_at
         )
         sign_in_as(member)
@@ -236,11 +220,9 @@ RSpec.describe 'Theatres API', type: :request do
         expect(theatre.host_user_id).to eq(member.id)
 
         expect(json['host_flg']).to eq(true)
-        expect(json['post_id']).to eq(niconico_post.id)
+        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)
-        expect(json['post_elapsed_ms'])
-          .to be_within(1_000).of(120_000)
       end
     end
   end
@@ -291,36 +273,16 @@ RSpec.describe 'Theatres API', type: :request do
       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([niconico_post.id, second_niconico_post.id, youtube_post.id])
-          .to include(theatre.reload.current_post_id)
         expect(theatre.reload.current_post_started_at)
           .to be_within(1.second).of(Time.current)
-        expect(theatre.programmes.count).to eq(1)
-      end
-    end
-
-    context 'when only a YouTube post is eligible' do
-      before do
-        niconico_post.destroy!
-        second_niconico_post.destroy!
-        theatre.update!(host_user: member)
-        sign_in_as(member)
-      end
-
-      it 'sets current_post to the YouTube post' do
-        do_request
-
-        expect(response).to have_http_status(:no_content)
-        expect(theatre.reload.current_post_id).to eq(youtube_post.id)
       end
     end
 
     context 'when current user is host and no eligible post exists' do
       before do
-        niconico_post.destroy!
-        second_niconico_post.destroy!
         youtube_post.destroy!
         theatre.update!(
           host_user: member,
@@ -337,189 +299,9 @@ RSpec.describe 'Theatres API', type: :request do
 
         theatre.reload
         expect(theatre.current_post_id).to be_nil
-        expect(theatre.current_post_started_at).to be_nil
+        expect(theatre.current_post_started_at)
+          .to be_within(1.second).of(Time.current)
       end
     end
   end
-
-  describe 'PUT /theatres/:id/skip_vote' do
-    subject(:do_request) do
-      put "/theatres/#{theatre.id}/skip_vote", params: { post_id: requested_post_id }
-    end
-
-    let(:third_user) { create(:user, :member, name: 'third user') }
-    let(:requested_post_id) { niconico_post.id }
-
-    before do
-      theatre.update!(current_post: niconico_post, current_post_started_at: 10.seconds.ago)
-      [member, other_user, third_user].each do |user|
-        TheatreWatchingUser.create!(
-          theatre:,
-          user:,
-          expires_at: 10.seconds.from_now
-        )
-      end
-    end
-
-    it 'returns 401 when not logged in' do
-      sign_out
-
-      expect { do_request }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'returns 422 when post_id is invalid' do
-      sign_in_as(member)
-
-      expect {
-        put "/theatres/#{theatre.id}/skip_vote", params: { post_id: 'invalid' }
-      }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-    end
-
-    it 'records a vote and returns the current vote status before majority' do
-      sign_in_as(member)
-
-      expect { do_request }.to change(TheatreSkipVote, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['skipped']).to eq(false)
-      expect(json['post_id']).to eq(niconico_post.id)
-      expect(json['skip_vote']).to include(
-        'votes_count' => 1,
-        'required_count' => 2,
-        'watching_users_count' => 3,
-        'voted' => true
-      )
-    end
-
-    it 'finalizes skip when votes reach majority and stores voters and tag snapshots' do
-      tag = create(:tag, name: 'skip-target')
-      PostTag.create!(post: niconico_post, tag:)
-
-      TheatreSkipVote.create!(theatre:, post: niconico_post, user: member)
-      sign_in_as(other_user)
-
-      expect { do_request }
-        .to change(TheatreSkipEvent, :count).by(1)
-        .and change(TheatreSkipEventVoter, :count).by(2)
-        .and change(TheatreSkipEventTag, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['skipped']).to eq(true)
-      expect([second_niconico_post.id, youtube_post.id]).to include(json['post_id'])
-
-      event = TheatreSkipEvent.last
-      expect(event.post).to eq(niconico_post)
-      expect(event.users).to contain_exactly(member, other_user)
-      expect(event.tags).to contain_exactly(tag)
-      expect(TheatreSkipVote.where(theatre:, post: niconico_post)).to be_empty
-    end
-
-    it 'does not record a vote when requested post is no longer current' do
-      theatre.update!(current_post: second_niconico_post)
-      sign_in_as(member)
-
-      expect { do_request }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:conflict)
-      expect(json['post_id']).to eq(second_niconico_post.id)
-      expect(json['skip_vote']).to include(
-        'votes_count' => 0,
-        'voted' => false
-      )
-    end
-  end
-
-  describe 'DELETE /theatres/:id/skip_vote' do
-    let(:requested_post_id) { niconico_post.id }
-
-    before do
-      theatre.update!(current_post: niconico_post, current_post_started_at: 10.seconds.ago)
-      TheatreWatchingUser.create!(theatre:, user: member, expires_at: 10.seconds.from_now)
-      TheatreSkipVote.create!(theatre:, post: niconico_post, user: member)
-      sign_in_as(member)
-    end
-
-    it 'removes the current user vote' do
-      expect {
-        delete "/theatres/#{theatre.id}/skip_vote", params: { post_id: requested_post_id }
-      }.to change(TheatreSkipVote, :count).by(-1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json['skip_vote']).to include(
-        'votes_count' => 0,
-        'required_count' => 1,
-        'watching_users_count' => 1,
-        'voted' => false
-      )
-    end
-
-    it 'does not remove a vote when requested post is no longer current' do
-      theatre.update!(current_post: second_niconico_post)
-
-      expect {
-        delete "/theatres/#{theatre.id}/skip_vote", params: { post_id: requested_post_id }
-      }.not_to change(TheatreSkipVote, :count)
-
-      expect(response).to have_http_status(:conflict)
-      expect(json['post_id']).to eq(second_niconico_post.id)
-    end
-  end
-
-  describe 'GET /theatres/:id/skip_events' do
-    before do
-      sign_in_as(member)
-    end
-
-    it 'does not expose skip voters' do
-      event = TheatreSkipEvent.create!(
-        theatre:,
-        post: niconico_post,
-        skipped_by_user: member,
-        created_at: Time.current
-      )
-      TheatreSkipEventVoter.create!(theatre_skip_event: event, user: member)
-
-      get "/theatres/#{theatre.id}/skip_events"
-
-      expect(response).to have_http_status(:ok)
-      expect(json.first).to include(
-        'id' => event.id,
-        'theatre_id' => theatre.id
-      )
-      expect(json.first).not_to have_key('voters')
-      expect(json.first).not_to have_key('skipped_by_user')
-    end
-  end
-
-  describe 'GET /theatres/:id/post_selection_weights' do
-    before do
-      theatre.update!(current_post: niconico_post)
-      TheatreWatchingUser.create!(theatre:, user: member, expires_at: 10.seconds.from_now)
-      sign_in_as(member)
-    end
-
-    it 'returns tag penalties and candidate weights for the current watchers' do
-      tag = create(:tag, name: 'heavy-tag')
-      PostTag.create!(post: second_niconico_post, tag:)
-      event = TheatreSkipEvent.create!(
-        theatre:,
-        post: niconico_post,
-        skipped_by_user: member,
-        created_at: Time.current
-      )
-      TheatreSkipEventVoter.create!(theatre_skip_event: event, user: member)
-      TheatreSkipEventTag.create!(theatre_skip_event: event, tag:)
-
-      get "/theatres/#{theatre.id}/post_selection_weights"
-
-      expect(response).to have_http_status(:ok)
-      expect(json['tag_penalties'].first['penalty']).to eq(1)
-      expect(json['lightest_posts'].first['post']['id']).to eq(second_niconico_post.id)
-      expect(json['lightest_posts'].first['penalty']).to eq(1)
-    end
-  end
 end

frontend/AGENTS.md

@@ -4,8 +4,7 @@
 
 These rules apply to work under `frontend/`.
 
-This is a Vite + React + TypeScript app using TanStack Query, Tailwind CSS,
-Framer Motion, Radix UI-style components, MDX, and Zustand.
+This is a Vite + React + TypeScript app using TanStack Query, Tailwind CSS, Framer Motion, Radix UI-style components, MDX, and Zustand.
 
 ## Commands
 
@@ -18,11 +17,9 @@ npm run lint
 npm run preview
 ```
 
-`npm run build` runs `tsc -b && vite build`, and `postbuild` runs
-`node scripts/generate-sitemap.js`.
+`npm run build` runs `tsc -b && vite build`, and `postbuild` runs `node scripts/generate-sitemap.js`.
 
-There is currently no `test` script in `package.json`. Do not run or report
-`npm test` unless a test script is added.
+There is currently no `test` script in `package.json`. Do not run or report `npm test` unless a test script is added.
 
 After frontend changes, run:
 
@@ -33,43 +30,20 @@ npm run lint
 
 If either command cannot be run or fails, report the exact command and failure.
 
-Do not create, modify, or run tests unless the user explicitly asks for test
-work. When the user asks for tests, keep working and rerun them until they
-pass or the remaining failure is clearly blocked.
-
 ## TypeScript
 
-- TypeScript is strict. `tsconfig.app.json` enables `strict`,
-  `noUnusedLocals`, `noUnusedParameters`, `erasableSyntaxOnly`,
-  `noFallthroughCasesInSwitch`, and `noUncheckedSideEffectImports`.
+- TypeScript is strict. `tsconfig.app.json` enables `strict`, `noUnusedLocals`, `noUnusedParameters`, `erasableSyntaxOnly`, `noFallthroughCasesInSwitch`, and `noUncheckedSideEffectImports`.
 - Keep types explicit at module boundaries, API helpers, and exported utilities.
 - Use `import type` for type-only imports.
 - Prefer existing shared types from `src/types.ts` before adding local duplicate types.
-- Preserve the repository's existing spacing style in TypeScript, including
-  GNU-style spacing before call parentheses where it is already used.
+- Preserve the repository's existing spacing style in TypeScript, including GNU-style spacing before call parentheses where it is already used.
 - Prefer single quotes for strings unless interpolation or escaping makes double quotes better.
-- Never write a TypeScript or TSX line longer than 99 characters.
-- Aim to keep TypeScript and TSX lines within 79 characters where practical.
-- Use 4-space logical indentation in TypeScript and TSX.
-- For arrays, never put whitespace or a line break immediately before `]`.
-- Keep the first element on the same line as `[` by default.
-- If an array would exceed the line limit, break after `[` and indent
-  elements by 4 spaces.
-- In TypeScript and TSX only, replace every leading run of 8 spaces with a tab
-  to reduce bytes.
-- Treat one leading tab as exactly equivalent to 8 leading spaces.
-- Use tabs only for leading indentation. Never replace spaces that occur after
-  a non-space character on the same line.
 
 ## React
 
 - Use function components.
-- Existing page components commonly export an anonymous function satisfying
-  `FC`; match nearby file style when editing.
+- Existing page components commonly export an anonymous function satisfying `FC`; match nearby file style when editing.
 - React hooks must be called unconditionally and at the top level of components or custom hooks.
-- Gate editing and other privileged controls with shared permission helpers
-  such as `canEditContent`, instead of showing controls and relying only on a
-  later API failure.
 - Keep page-level components under `src/pages`.
 - Keep shared and feature components under `src/components`.
 - Use `react-router-dom` route params and navigation patterns already present in `src/App.tsx`.
@@ -78,23 +52,17 @@ pass or the remaining failure is clearly blocked.
 ## TanStack Query
 
 - Use `@tanstack/react-query` for server state.
-- Query keys should come from `src/lib/queryKeys.ts`; add key builders there
-  instead of using ad hoc arrays in components.
-- Fetch functions should live in domain helpers under `src/lib`, such as
-  `posts.ts`, `tags.ts`, or `wiki.ts`.
-- Use `useQueryClient().invalidateQueries` with the shared root keys when
-  mutations affect cached lists or detail views.
-- The app-wide `QueryClient` is configured in `src/main.tsx`; do not create
-  additional clients in feature code.
+- Query keys should come from `src/lib/queryKeys.ts`; add key builders there instead of using ad hoc arrays in components.
+- Fetch functions should live in domain helpers under `src/lib`, such as `posts.ts`, `tags.ts`, or `wiki.ts`.
+- Use `useQueryClient().invalidateQueries` with the shared root keys when mutations affect cached lists or detail views.
+- The app-wide `QueryClient` is configured in `src/main.tsx`; do not create additional clients in feature code.
 
 ## API calls
 
 - Use `src/lib/api.ts` for HTTP calls.
-- The API wrapper attaches `X-Transfer-Code` from `localStorage` and converts
-  non-blob responses to camelCase.
+- The API wrapper attaches `X-Transfer-Code` from `localStorage` and converts non-blob responses to camelCase.
 - Send Rails snake_case params and request body keys where the backend expects them.
-- Do not bypass the API wrapper unless there is a specific reason, such as a
-  third-party request outside the Rails API.
+- Do not bypass the API wrapper unless there is a specific reason, such as a third-party request outside the Rails API.
 - For blob responses, pass `responseType: 'blob'` so the wrapper does not camelCase the body.
 
 ## Imports and aliases
@@ -108,41 +76,17 @@ pass or the remaining failure is clearly blocked.
 
 - Tailwind scans `src/**/*.{html,js,ts,jsx,tsx,mdx}`.
 - Use `cn` from `src/lib/utils.ts` for conditional class names and class merging.
-- Reuse components from `src/components/common`, `src/components/layout`, and
-  `src/components/ui` before adding new primitives.
+- Reuse components from `src/components/common`, `src/components/layout`, and `src/components/ui` before adding new primitives.
 - Keep Tailwind classes consistent with nearby components.
-- Prefer restrained, content-first UI chrome: avoid adding card backgrounds,
-  heavy borders, or nested panel decoration unless the surrounding screen
-  already uses them.
-- Keep operational screens dense and direct; trim explanatory copy and use
-  short Japanese labels that fit the control.
-- Preserve existing Japanese tone and orthography in nearby UI text, including
-  old-kana wording where the file already uses it.
-- When adding dynamic tag color classes, update `tailwind.config.js` safelist
-  if the class cannot be statically detected.
+- When adding dynamic tag color classes, update `tailwind.config.js` safelist if the class cannot be statically detected.
 - Do not introduce new UI libraries or production dependencies without approval.
 
-## TSX formatting
-
-- Preserve compact TSX expression shapes such as inline ternary branches and
-  closing `</div>)` forms when nearby code uses them.
-- For long Tailwind `className` strings, wrap across lines only when needed.
-- Keep continuation indentation aligned with the 4-space logical indentation
-  rule, using tabs only as leading 8-space compression.
-- Do not add braces around `if`, `else`, or `for` bodies when the body is a
-  single physical line.
-- Always add braces around `if`, `else`, or `for` bodies when the body spans
-  two or more physical lines, even if it is one statement.
-- Avoid reformatting unrelated JSX.
-
 ## Lint and build constraints
 
-- ESLint uses `@eslint/js`, `typescript-eslint`, `eslint-plugin-react-hooks`,
-  and `eslint-plugin-react-refresh`.
+- ESLint uses `@eslint/js`, `typescript-eslint`, `eslint-plugin-react-hooks`, and `eslint-plugin-react-refresh`.
 - The hooks rules are enforced; fix hook ordering instead of disabling the rule.
 - `react-refresh/only-export-components` is enabled as a warning with `allowConstantExport`.
-- Build failures from unused locals or unused parameters are TypeScript
-  errors, not lint-only issues.
+- Build failures from unused locals or unused parameters are TypeScript errors, not lint-only issues.
 
 ## Files to avoid in routine work
 

frontend/src/App.tsx

@@ -18,7 +18,6 @@ import MaterialListPage from '@/pages/materials/MaterialListPage'
 import MaterialNewPage from '@/pages/materials/MaterialNewPage'
 // import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 import MorePage from '@/pages/MorePage'
-import GekanatorPage from '@/pages/GekanatorPage'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import TOSPage from '@/pages/TOSPage.mdx'
@@ -65,7 +64,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	  <Route path="/nico/tags" element={<NicoTagListPage user={user}/>}/>
 	  <Route path="/tags/changes" element={<TagHistoryPage/>}/>
-	  <Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
+	  <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
 	  <Route path="/materials" element={<MaterialBasePage/>}>
 	    <Route index element={<MaterialListPage/>}/>
 	    <Route path="new" element={<MaterialNewPage/>}/>
@@ -81,7 +80,6 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/users/settings" element={<SettingPage user={user} setUser={setUser}/>}/>
 	  <Route path="/settings" element={<Navigate to="/users/settings" replace/>}/>
 	  <Route path="/tos" element={<TOSPage/>}/>
-	  <Route path="/gekanator" element={<GekanatorPage user={user}/>}/>
 	  <Route path="/more" element={<MorePage/>}/>
 	  <Route path="*" element={<NotFound/>}/>
 	</Routes>

frontend/src/components/NicoViewer.test.tsx

@@ -1,83 +0,0 @@
-import { act, fireEvent, render } from '@testing-library/react'
-import { afterEach, describe, expect, it, vi } from 'vitest'
-import { createRef } from 'react'
-
-import NicoViewer from '@/components/NicoViewer'
-
-import type { NiconicoViewerHandle } from '@/types'
-
-
-describe ('NicoViewer', () => {
-  afterEach (() => {
-    vi.useRealTimers ()
-  })
-
-  it ('does not time out after metadata reports a playable duration', () => {
-    vi.useFakeTimers ()
-
-    const onError = vi.fn ()
-    const onMetadataChange = vi.fn ()
-    const { container } = render (
-        <NicoViewer
-            id="sm12345"
-            width={640}
-            height={360}
-            onMetadataChange={onMetadataChange}
-            onError={onError}/>,
-    )
-    const iframe = container.querySelector ('iframe')
-    expect (iframe).not.toBeNull ()
-
-    fireEvent.load (iframe!)
-    act (() => {
-      window.dispatchEvent (new MessageEvent ('message', {
-        origin: 'https://embed.nicovideo.jp',
-        source: iframe!.contentWindow,
-        data:   {
-          eventName: 'playerMetadataChange',
-          data:      {
-            currentTime:           7,
-            duration:              120,
-            isVideoMetaDataLoaded: true,
-            maximumBuffered:       30,
-            muted:                 false,
-            showComment:           true,
-            volume:                1,
-          },
-        },
-      }))
-    })
-
-    act (() => {
-      vi.advanceTimersByTime (8_000)
-    })
-
-    expect (onMetadataChange).toHaveBeenCalled ()
-    expect (onError).not.toHaveBeenCalled ()
-  })
-
-  it ('seeks with milliseconds', () => {
-    const ref = createRef<NiconicoViewerHandle> ()
-    const { container } = render (
-        <NicoViewer
-            ref={ref}
-            id="sm12345"
-            width={640}
-            height={360}/>,
-    )
-    const iframe = container.querySelector ('iframe')!
-    const postMessage = vi.spyOn (iframe.contentWindow!, 'postMessage')
-
-    act (() => {
-      ref.current!.seek (7_000)
-    })
-
-    expect (postMessage).toHaveBeenCalledWith (
-        expect.objectContaining ({
-          eventName: 'seek',
-          data:      { time: 7_000 },
-        }),
-        'https://embed.nicovideo.jp',
-    )
-  })
-})

frontend/src/components/NicoViewer.tsx

@@ -14,20 +14,10 @@ import type { NiconicoMetadata, NiconicoVideoInfo, NiconicoViewerHandle } from '
 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 }
+    | { 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 }
@@ -40,7 +30,6 @@ type NiconicoCommand =
 	data: { commentVisibility: boolean } }
 
 const EMBED_ORIGIN = 'https://embed.nicovideo.jp'
-const LOAD_COMPLETE_TIMEOUT_MS = 8_000
 
 type Props = {
     id:                 string
@@ -48,18 +37,14 @@ type Props = {
     height:             number
     style?:             CSSProperties
     onLoadComplete?:    (info: NiconicoVideoInfo) => void
-    onMetadataChange?:  (meta: NiconicoMetadata) => void
-    onError?:           (data: unknown) => void }
+    onMetadataChange?:  (meta: NiconicoMetadata) => void }
 
 
 export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle>) => {
-  const { id, width, height, style = { }, onLoadComplete, onMetadataChange, onError } = props
+  const { id, width, height, style = { }, onLoadComplete, onMetadataChange } = props
 
   const iframeRef = useRef<HTMLIFrameElement> (null)
-  const loadCompleteTimerRef = useRef<ReturnType<typeof setTimeout> | null> (null)
-  const playerId = useMemo (
-      () => `nico-${ id }-${ Math.random ().toString (36).slice (2) }`,
-      [id])
+  const playerId = useMemo (() => `nico-${ id }-${ Math.random ().toString (36).slice (2) }`, [id])
 
   const [screenWidth, setScreenWidth] = useState<CSSProperties['width']> ()
   const [screenHeight, setScreenHeight] = useState<CSSProperties['height']> ()
@@ -94,24 +79,6 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
   const margedStyle: CSSProperties =
       { border: 'none', maxWidth: '100%', ...style, ...styleFullScreen }
 
-  const clearLoadCompleteTimer = useCallback (() => {
-    if (!(loadCompleteTimerRef.current))
-      return
-
-    clearTimeout (loadCompleteTimerRef.current)
-    loadCompleteTimerRef.current = null
-  }, [])
-
-  const startLoadCompleteTimer = useCallback (() => {
-    clearLoadCompleteTimer ()
-    loadCompleteTimerRef.current = setTimeout (() => {
-      onError?.({
-	  eventName: 'loadCompleteTimeout',
-	  reason:    'niconico video length was not reported by embed',
-      })
-    }, LOAD_COMPLETE_TIMEOUT_MS)
-  }, [clearLoadCompleteTimer, onError])
-
   const postToPlayer = useCallback ((message: NiconicoCommand) => {
     const win = iframeRef.current?.contentWindow
     if (!(win))
@@ -129,9 +96,7 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
   }, [playerId, postToPlayer])
 
   const seek = useCallback ((time: number) => {
-    postToPlayer (
-	{ eventName: 'seek', sourceConnectorType: 1, playerId,
-	  data: { time } })
+    postToPlayer ({ eventName: 'seek', sourceConnectorType: 1, playerId, data: { time } })
   }, [playerId, postToPlayer])
 
   const mute = useCallback (() => {
@@ -197,34 +162,24 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
 
       if (data.eventName === 'loadComplete')
 	{
-	  clearLoadCompleteTimer ()
 	  onLoadComplete?.(data.data.videoInfo)
 	  return
 	}
 
       if (data.eventName === 'playerMetadataChange')
 	{
-	  if (Number.isFinite (data.data.duration) && data.data.duration > 0)
-	    clearLoadCompleteTimer ()
-
 	  onMetadataChange?.(data.data)
 	  return
 	}
 
       if (data.eventName === 'error')
-	{
-	  clearLoadCompleteTimer ()
         console.error ('niconico player error:', data)
-	  onError?.(data)
-	}
     }
 
     addEventListener ('message', onMessage)
 
     return () => removeEventListener ('message', onMessage)
-  }, [clearLoadCompleteTimer, onError, onLoadComplete, onMetadataChange, playerId])
-
-  useEffect (() => clearLoadCompleteTimer, [clearLoadCompleteTimer])
+  }, [onLoadComplete, onMetadataChange, playerId])
 
   useLayoutEffect (() => {
     if (!(fullScreen))
@@ -279,7 +234,6 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
 	  width={width}
 	  height={height}
 	  style={margedStyle}
-		  onLoad={startLoadCompleteTimer}
 	  allowFullScreen
 	  allow="autoplay"/>)
 })

frontend/src/components/PostEmbed.test.tsx

@@ -8,19 +8,12 @@ const dialogue = vi.hoisted (() => ({
   confirm: vi.fn (),
 }))
 
-const nicoViewer = vi.hoisted (() => ({
-  props: vi.fn (),
-}))
-
 vi.mock ('@/components/dialogues/DialogueProvider', () => ({
   useDialogue: () => dialogue,
 }))
 
 vi.mock ('@/components/NicoViewer', () => ({
-  default: (props: { id: string }) => {
-    nicoViewer.props (props)
-    return <div>Nico:{props.id}</div>
-  },
+  default: ({ id }: { id: string }) => <div>Nico:{id}</div>,
 }))
 
 vi.mock ('react-youtube', () => ({
@@ -38,64 +31,6 @@ describe ('PostEmbed', () => {
     expect (screen.getByText ('Nico:sm12345')).toBeInTheDocument ()
   })
 
-  it ('reports niconico metadata as milliseconds', () => {
-    const onVideoReady = vi.fn ()
-    const onPlaybackChange = vi.fn ()
-    render (
-        <PostEmbed
-            post={buildPost ({ url: 'https://www.nicovideo.jp/watch/sm12345' })}
-            onVideoReady={onVideoReady}
-            onPlaybackChange={onPlaybackChange}/>,
-    )
-
-    nicoViewer.props.mock.calls[0][0].onMetadataChange ({
-      currentTime:            7_000,
-      duration:               120_000,
-      isVideoMetaDataLoaded:  true,
-      maximumBuffered:        30,
-      muted:                  false,
-      showComment:            true,
-      volume:                 1,
-    })
-
-    expect (onVideoReady).toHaveBeenCalledWith (120_000)
-    expect (onPlaybackChange).toHaveBeenCalledWith (7_000)
-  })
-
-  it ('reports niconico video readiness only once', () => {
-    const onVideoReady = vi.fn ()
-    render (
-        <PostEmbed
-            post={buildPost ({ url: 'https://www.nicovideo.jp/watch/sm12345' })}
-            onVideoReady={onVideoReady}/>,
-    )
-
-    nicoViewer.props.mock.calls[0][0].onLoadComplete ({
-      title:           '動画',
-      videoId:         'sm12345',
-      lengthInSeconds: 120,
-      thumbnailUrl:    'https://example.com/thumb.jpg',
-      description:     '',
-      viewCount:       1,
-      commentCount:    2,
-      mylistCount:     3,
-      postedAt:        '2026-01-02T03:04:05.000Z',
-      watchId:         12345,
-    })
-    nicoViewer.props.mock.calls[0][0].onMetadataChange ({
-      currentTime:            7_000,
-      duration:               120_000,
-      isVideoMetaDataLoaded:  true,
-      maximumBuffered:        30,
-      muted:                  false,
-      showComment:            true,
-      volume:                 1,
-    })
-
-    expect (onVideoReady).toHaveBeenCalledTimes (1)
-    expect (onVideoReady).toHaveBeenCalledWith (120_000)
-  })
-
   it ('embeds x/twitter status URLs', () => {
     render (<PostEmbed post={buildPost ({ url: 'https://x.com/someone/status/12345' })}/>)
 

frontend/src/components/PostEmbed.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useRef, useState } from 'react'
+import { useState } from 'react'
 import YoutubeEmbed from 'react-youtube'
 
 import NicoViewer from '@/components/NicoViewer'
@@ -8,113 +8,17 @@ import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import type { FC, RefObject } from 'react'
 
 import type { NiconicoMetadata, NiconicoVideoInfo, NiconicoViewerHandle, Post } from '@/types'
-import type { YouTubePlayer } from 'react-youtube'
-
-type YouTubeEvent<T = unknown> = {
-    data:    T
-    target:  YouTubePlayer }
 
 type Props = {
     ref?:               RefObject<NiconicoViewerHandle | null>
     post:               Post
     onLoadComplete?:    (info: NiconicoVideoInfo) => void
-    onMetadataChange?:  (meta: NiconicoMetadata) => void
-    onVideoReady?:      (durationMs: number) => void
-    onPlaybackChange?:  (currentTimeMs: number) => number | void
-    onError?:           (data: unknown) => void }
+    onMetadataChange?:  (meta: NiconicoMetadata) => void }
 
 
-const PostEmbed: FC<Props> = ({
-    ref,
-    post,
-    onLoadComplete,
-    onMetadataChange,
-    onVideoReady,
-    onPlaybackChange,
-    onError,
-}) => {
+const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) => {
   const dialogue = useDialogue ()
   const [framed, setFramed] = useState (false)
-  const [youtubePlayer, setYoutubePlayer] = useState<YouTubePlayer | null> (null)
-  const niconicoVideoReadyRef = useRef (false)
-
-  const notifyNiconicoVideoReady = useCallback ((durationMs: number) => {
-    if (niconicoVideoReadyRef.current
-	|| !(Number.isFinite (durationMs))
-	|| durationMs <= 0)
-      return
-
-    niconicoVideoReadyRef.current = true
-    onVideoReady?.(durationMs)
-  }, [onVideoReady])
-
-  const reportYoutubePlayback = useCallback (async (player: YouTubePlayer) => {
-    const currentTime = await player.getCurrentTime ()
-    const currentTimeMs = currentTime * 1_000
-    const targetTimeMs = onPlaybackChange?.(currentTimeMs)
-
-    if (typeof targetTimeMs !== 'number')
-      return
-
-    if (Math.abs (currentTimeMs - targetTimeMs) > 5_000)
-      await player.seekTo (targetTimeMs / 1_000, true)
-  }, [onPlaybackChange])
-
-  const handleYoutubeReady = async (event: YouTubeEvent) => {
-    setYoutubePlayer (event.target)
-
-    try
-    {
-      await event.target.playVideo ()
-
-      const duration = await event.target.getDuration ()
-      const durationMs = duration * 1_000
-      onVideoReady?.(durationMs)
-
-      if (!(Number.isFinite (durationMs)) || durationMs <= 0)
-	return
-
-      await reportYoutubePlayback (event.target)
-    }
-    catch (error)
-    {
-      onError?.({ platform: 'youtube', error })
-    }
-  }
-
-  const handleYoutubeStateChange = (event: YouTubeEvent<number>) => {
-    void reportYoutubePlayback (event.target)
-  }
-
-  const handleYoutubeError = (event: YouTubeEvent<number>) => {
-    onError?.({ platform: 'youtube', code: event.data })
-  }
-
-  const handleNiconicoLoadComplete = (info: NiconicoVideoInfo) => {
-    notifyNiconicoVideoReady (info.lengthInSeconds * 1_000)
-    onLoadComplete?.(info)
-  }
-
-  const handleNiconicoMetadataChange = (meta: NiconicoMetadata) => {
-    notifyNiconicoVideoReady (meta.duration)
-    onPlaybackChange?.(meta.currentTime)
-    onMetadataChange?.(meta)
-  }
-
-  useEffect (() => {
-    niconicoVideoReadyRef.current = false
-  }, [post.url])
-
-  useEffect (() => {
-    if (!(youtubePlayer) || !(onPlaybackChange))
-      return
-
-    const timer = setInterval (
-	() => void reportYoutubePlayback (youtubePlayer),
-	1_000)
-
-    return () => clearInterval (timer)
-  }, [onPlaybackChange, reportYoutubePlayback, youtubePlayer])
 
   const url = new URL (post.url)
 
@@ -134,9 +38,8 @@ const PostEmbed: FC<Props> = ({
 	      id={videoId}
 	      width={640}
 	      height={360}
-	      onLoadComplete={handleNiconicoLoadComplete}
-	      onMetadataChange={handleNiconicoMetadataChange}
-	      onError={onError}/>)
+	      onLoadComplete={onLoadComplete}
+	      onMetadataChange={onMetadataChange}/>)
     }
 
   case 'twitter.com':
@@ -166,10 +69,7 @@ const PostEmbed: FC<Props> = ({
 	      mute:         0,
 	      loop:         1,
 	      width:        '640',
-	      height:       '360' } }}
-	      onReady={handleYoutubeReady}
-	      onStateChange={handleYoutubeStateChange}
-	      onError={handleYoutubeError}/>)
+	      height:       '360' } }}/>)
     }
   }
 

frontend/src/components/TopNav.tsx

@@ -55,6 +55,12 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	  { name: '追加', to: '/materials/new' },
 	  { name: '全体履歴', 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' },
@@ -65,9 +71,6 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	    visible: wikiPageFlg },
 	  { name: '履歴', to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
 	  { name: '編輯', to: `/wiki/${ wikiId || wikiTitle }/edit`, visible: wikiPageFlg }] },
-      { name: 'おたのしみ', visible: false, subMenu: [
-	  { name: 'グカネータ', to: '/gekanator' },
-	  { name: '上映会 (β)', to: '/theatres/1' }] },
       { 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 },
@@ -129,12 +132,8 @@ const TopNav: FC<Props> = ({ user }) => {
 
   const menu = menuOutline ({ tag, wikiId, user, pathName: location.pathname })
   const visibleMenu = menu.filter ((item): item is MenuVisibleItem => item.visible ?? true)
-  const moreMenu = menu.filter (item =>
-      !(item.visible ?? true)
-      || item.subMenu.filter (subItem => subItem.visible ?? true).length > 0)
   const activeIdx =
       visibleMenu.findIndex (item => location.pathname.startsWith (item.base || item.to))
-  const submenuHeight = moreVsbl ? 40 * moreMenu.length : (activeIdx < 0 ? 0 : 40)
 
   const prevActiveIdxRef = useRef<number> (activeIdx)
 
@@ -245,9 +244,9 @@ const TopNav: FC<Props> = ({ user }) => {
 	  <motion.div
 	      key="submenu-shell"
 	      layout
-	      className="relative z-20 hidden md:block overflow-hidden
+	      className="relative hidden md:block overflow-hidden
 			 bg-yellow-200 dark:bg-red-950"
-	      animate={{ height: submenuHeight }}
+	      style={{ height: moreVsbl ? 40 * menu.length : (activeIdx < 0 ? 0 : 40) }}
 	      onMouseLeave={() => {
 		if (moreVsbl)
 		  setMoreVsbl (false)
@@ -258,7 +257,7 @@ const TopNav: FC<Props> = ({ user }) => {
 	      }}>
 	  {moreVsbl
 	   ? (
-	      moreMenu.map ((item, i) => (
+	      menu.map ((item, i) => (
 		  <div key={i} className="relative h-[40px]">
 		    <div className="absolute inset-0 flex items-center px-3">
 		      <motion.div
@@ -268,7 +267,7 @@ const TopNav: FC<Props> = ({ user }) => {
 			       : { initial: { x: 40, y: -40, opacity: 0 },
 				   animate: { x: 0, y: 0, opacity: 1 },
 				   exit: { x: 40, y: -40, opacity: 0 } })}
-			  className="z-10 h-full flex items-center px-3 font-bold w-28">
+			  className="z-10 h-full flex items-center px-3 font-bold w-24">
 			<h2>{item.name}</h2>
 		      </motion.div>
 		      {item.subMenu

frontend/src/lib/api.ts

@@ -64,14 +64,11 @@ export const apiPatch = async <T> (
 ): Promise<T> => apiP ('patch', path, body, opt)
 
 
-export const apiDelete = async <T = void> (
+export const apiDelete = async (
     path: string,
     opt?: Opt,
-): Promise<T> => {
-  const res = await client.delete (path, withUserCode (opt))
-  if (res.data == null || res.data === '')
-    return undefined as T
-  return toCamel (res.data as Record<string, unknown>, { deep: true }) as T
+): Promise<void> => {
+  await client.delete (path, withUserCode (opt))
 }
 
 

frontend/src/lib/gekanator.test.ts

@@ -1,375 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { apiPost } from '@/lib/api'
-import {
-  buildGekanatorQuestions,
-  expectedAnswerForQuestion,
-  restoreGekanatorQuestion,
-  saveGekanatorExtraQuestionAnswers,
-  saveGekanatorGame,
-  saveGekanatorQuestionSuggestion,
-} from '@/lib/gekanator'
-
-import type {
-  GekanatorAnswerLog,
-  StoredGekanatorQuestion,
-} from '@/lib/gekanator'
-import type { Post } from '@/types'
-
-vi.mock('@/lib/api', () => ({
-  apiGet: vi.fn(),
-  apiPost: vi.fn(),
-}))
-
-const mockedApiPost = vi.mocked(apiPost)
-
-const post = (overrides: Partial<Post> = {}): Post => ({
-  id: 1,
-  versionNo: 1,
-  url: 'https://example.com/posts/1',
-  title: 'post title',
-  thumbnail: null,
-  thumbnailBase: null,
-  tags: [],
-  viewed: false,
-  related: [],
-  originalCreatedFrom: null,
-  originalCreatedBefore: null,
-  createdAt: '2026-06-10T00:00:00.000Z',
-  updatedAt: '2026-06-10T00:00:00.000Z',
-  uploadedUser: null,
-  ...overrides,
-})
-
-describe('expectedAnswerForQuestion', () => {
-  it('returns a direct example answer when present', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 999,
-        answer: 'yes',
-        threshold: 0.65,
-      },
-      exampleAnswers: {
-        1: 'partial',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 1 }))).toBe('partial')
-  })
-
-  it('returns the condition answer for the original post_similarity post', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 123,
-        answer: 'probably_no',
-        threshold: 0.65,
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 123 }))).toBe('probably_no')
-  })
-
-  it('returns null for an unrelated post_similarity post without examples', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 123,
-        answer: 'yes',
-        threshold: 0.65,
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 456 }))).toBeNull()
-  })
-
-  it('returns yes for a matching tag question', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'tag:character:喜多郁代',
-      text: '喜多ちゃんが関係してる?',
-      kind: 'tag',
-      condition: {
-        type: 'tag',
-        key: 'character:喜多郁代',
-      },
-    }
-
-    expect(
-      expectedAnswerForQuestion(
-        question,
-        post({
-          tags: [
-            {
-              id: 1,
-              name: '喜多郁代',
-              category: 'character',
-              aliases: [],
-              parents: [],
-              postCount: 1,
-              createdAt: '2026-06-10T00:00:00.000Z',
-              updatedAt: '2026-06-10T00:00:00.000Z',
-              hasWiki: false,
-              hasDeerjikists: false,
-              materialId: null,
-            },
-          ],
-        }),
-      ),
-    ).toBe('yes')
-  })
-
-  it('returns no for a non-matching tag question', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'tag:character:喜多郁代',
-      text: '喜多ちゃんが関係してる?',
-      kind: 'tag',
-      condition: {
-        type: 'tag',
-        key: 'character:喜多郁代',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ tags: [] }))).toBe('no')
-  })
-
-  it('ignores example answers for direct title facts', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'title:length-at-least:20',
-      text: 'タイトルは 20 文字以上?',
-      kind: 'title',
-      condition: {
-        type: 'title-length-at-least',
-        length: 20,
-      },
-      exampleAnswers: {
-        1: 'yes',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 1, title: 'short' }))).toBe('no')
-  })
-})
-
-describe('restoreGekanatorQuestion', () => {
-  it('uses default source and priority weight when omitted', () => {
-    const question = restoreGekanatorQuestion({
-      id: 'tag:character:喜多郁代',
-      text: '喜多ちゃんが関係してる?',
-      kind: 'tag',
-      condition: {
-        type: 'tag',
-        key: 'character:喜多郁代',
-      },
-    })
-
-    expect(question.source).toBe('default')
-    expect(question.priorityWeight).toBe(1)
-  })
-
-  it('tests a post_similarity question using direct examples', () => {
-    const question = restoreGekanatorQuestion({
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 999,
-        answer: 'yes',
-        threshold: 0.65,
-      },
-      exampleAnswers: {
-        1: 'yes',
-        2: 'no',
-      },
-    })
-
-    expect(question.test(post({ id: 1 }))).toBe(true)
-    expect(question.test(post({ id: 2 }))).toBe(false)
-    expect(question.test(post({ id: 3 }))).toBe(false)
-  })
-
-  it('tests a post_similarity question against its configured partial answer', () => {
-    const question = restoreGekanatorQuestion({
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 999,
-        answer: 'partial',
-        threshold: 0.65,
-      },
-      exampleAnswers: {
-        1: 'partial',
-        2: 'yes',
-      },
-    })
-
-    expect(question.test(post({ id: 1 }))).toBe(true)
-    expect(question.test(post({ id: 2 }))).toBe(false)
-  })
-
-  it('normalizes legacy title-length-greater-than questions', () => {
-    const question = restoreGekanatorQuestion({
-      id: 'title:length-greater-than:20',
-      text: '題名が長めの投稿?',
-      kind: 'title',
-      condition: {
-        type: 'title-length-greater-than',
-        length: 20,
-      },
-    })
-
-    expect(question.id).toBe('title:length-at-least:21')
-    expect(question.condition).toEqual({
-      type: 'title-length-at-least',
-      length: 21,
-    })
-    expect(question.test(post({ title: 'x'.repeat(20) }))).toBe(false)
-    expect(question.test(post({ title: 'x'.repeat(21) }))).toBe(true)
-  })
-})
-
-describe('buildGekanatorQuestions', () => {
-  it('builds quantitative title length questions', () => {
-    const questions = buildGekanatorQuestions([
-      post({ id: 1, title: 'a' }),
-      post({ id: 2, title: 'bb' }),
-      post({ id: 3, title: 'ccc' }),
-      post({ id: 4, title: 'dddd' }),
-    ])
-    const titleQuestion = questions.find(question =>
-      question.condition.type === 'title-length-at-least')
-
-    expect(titleQuestion?.text).toMatch(/^タイトルは \d+ 文字以上\?$/)
-    expect(titleQuestion?.id).toMatch(/^title:length-at-least:\d+$/)
-  })
-})
-
-describe('Gekanator API writers', () => {
-  beforeEach(() => {
-    mockedApiPost.mockReset()
-  })
-
-  it('sends game results using snake_case request keys', async () => {
-    mockedApiPost.mockResolvedValue({ id: 100 })
-
-    const answers: GekanatorAnswerLog[] = [
-      {
-        questionId: 'tag:character:喜多郁代',
-        questionText: '喜多ちゃんが関係してる?',
-        questionCondition: {
-          type: 'tag',
-          key: 'character:喜多郁代',
-        },
-        answer: 'yes',
-        originalAnswer: 'partial',
-      },
-    ]
-
-    await expect(
-      saveGekanatorGame({
-        guessedPostId: 1,
-        correctPostId: 2,
-        answers,
-      }),
-    ).resolves.toEqual({ id: 100 })
-
-    expect(mockedApiPost).toHaveBeenCalledWith('/gekanator/games', {
-      guessed_post_id: 1,
-      correct_post_id: 2,
-      answers: [
-        {
-          question_id: 'tag:character:喜多郁代',
-          question_text: '喜多ちゃんが関係してる?',
-          question_condition: {
-            type: 'tag',
-            key: 'character:喜多郁代',
-          },
-          answer: 'yes',
-          original_answer: 'partial',
-        },
-      ],
-    })
-  })
-
-  it('sends question suggestions using snake_case request keys', async () => {
-    mockedApiPost.mockResolvedValue({
-      id: 10,
-      count: 1,
-    })
-
-    await expect(
-      saveGekanatorQuestionSuggestion({
-        gekanatorGameId: 100,
-        questionText: '喜多ちゃんが泣いてる?',
-        answer: 'yes',
-      }),
-    ).resolves.toEqual({
-      id: 10,
-      count: 1,
-    })
-
-    expect(mockedApiPost).toHaveBeenCalledWith('/gekanator/question_suggestions', {
-      gekanator_game_id: 100,
-      question_text: '喜多ちゃんが泣いてる?',
-      answer: 'yes',
-    })
-  })
-
-  it('sends extra question answers using snake_case request keys', async () => {
-    mockedApiPost.mockResolvedValue({
-      count: 2,
-    })
-
-    await saveGekanatorExtraQuestionAnswers({
-      gameId: 100,
-      answers: [
-        {
-          questionId: 10,
-          answer: 'yes',
-        },
-        {
-          questionId: 11,
-          answer: 'probably_no',
-        },
-      ],
-    })
-
-    expect(mockedApiPost).toHaveBeenCalledWith(
-      '/gekanator/games/100/extra_question_answers',
-      {
-        answers: [
-          {
-            question_id: 10,
-            answer: 'yes',
-          },
-          {
-            question_id: 11,
-            answer: 'probably_no',
-          },
-        ],
-      },
-    )
-  })
-})

frontend/src/lib/gekanator.ts

@@ -1,621 +0,0 @@
-import { apiGet, apiPost } from '@/lib/api'
-
-import type { Post } from '@/types'
-
-export type GekanatorAnswerValue =
-    | 'yes'
-    | 'no'
-    | 'partial'
-    | 'probably_no'
-    | 'unknown'
-
-export type GekanatorAnswerLog = {
-    questionId:       string
-    questionText:     string
-    questionCondition?:  GekanatorQuestionCondition
-    questionMode?:    'normal' | 'winning_run'
-    answer:           GekanatorAnswerValue
-    originalAnswer:   GekanatorAnswerValue }
-
-export type GekanatorQuestionKind =
-    | 'tag'
-    | 'source'
-    | 'title'
-    | 'original_date'
-    | 'post_similarity'
-
-export type GekanatorQuestionSource =
-    | 'default'
-    | 'user_suggested'
-    | 'ai_generated'
-    | 'admin_curated'
-
-export type GekanatorPerformanceMode = 'lite' | 'normal'
-
-export type GekanatorQuestionCondition =
-    | { type: 'tag'; key: string }
-    | { type: 'source'; host: string }
-    | { type: 'original-year'; year: number }
-    | { type: 'original-month'; month: number }
-    | { type: 'original-month-day'; monthDay: string }
-    | { type: 'title-length-at-least'; length: number }
-    | { type: 'title-length-greater-than'; length: number }
-    | { type: 'title-has-ascii' }
-    | { type: 'title-contains'; text: string }
-    | {
-	  type: 'post-similarity'
-	  postId: number
-	  answer: GekanatorAnswerValue
-	  threshold: number
-      }
-
-
-type NonPostSimilarityCondition = Exclude<
-    GekanatorQuestionCondition,
-    { type: 'post-similarity' }
->
-
-export type GekanatorExtraQuestion = {
-    id:              number
-    text:            string
-    source:          GekanatorQuestionSource
-    priorityWeight:  number }
-
-export type StoredGekanatorQuestion = {
-    id:              string
-    text:            string
-    kind:            GekanatorQuestionKind
-    condition:       GekanatorQuestionCondition
-    source?:         GekanatorQuestionSource
-    priorityWeight?: number
-    exampleAnswers?: Record<`${ number }`, GekanatorAnswerValue> }
-
-export type GekanatorQuestion = {
-    id:              string
-    text:            string
-    kind:            GekanatorQuestionKind
-    condition:       GekanatorQuestionCondition
-    source:          GekanatorQuestionSource
-    priorityWeight:  number
-    exampleAnswers?: Record<`${ number }`, GekanatorAnswerValue>
-    test:            (post: Post) => boolean }
-
-export type BuildGekanatorQuestionsOptions = {
-    includeTitleContains?: boolean
-    tagQuestionCap?: number
-    titleContainsCap?: number
-    totalQuestionCap?: number
-}
-
-
-export const normalizeTitleLengthCondition = (
-    condition:  GekanatorQuestionCondition,
-): GekanatorQuestionCondition => {
-  switch (condition.type)
-  {
-  case 'title-length-greater-than':
-    return {
-	type:   'title-length-at-least',
-	length: condition.length + 1 }
-  default:
-    return condition
-  }
-}
-
-
-export const titleLengthMinimumForCondition = (
-    condition:  GekanatorQuestionCondition,
-): number | null => {
-  switch (condition.type)
-  {
-  case 'title-length-at-least':
-    return condition.length
-  case 'title-length-greater-than':
-    return condition.length + 1
-  default:
-    return null
-  }
-}
-
-
-export const questionIdForCondition = (
-    condition:  NonPostSimilarityCondition,
-): string => {
-  switch (condition.type)
-  {
-  case 'tag':
-    return `tag:${ condition.key }`
-  case 'source':
-    return `source:${ condition.host }`
-  case 'original-year':
-    return `original-year:${ condition.year }`
-  case 'original-month':
-    return `original-month:${ condition.month }`
-  case 'original-month-day':
-    return `original-month-day:${ condition.monthDay }`
-  case 'title-length-at-least':
-  case 'title-length-greater-than':
-    return `title:length-at-least:${ titleLengthMinimumForCondition (condition) }`
-  case 'title-has-ascii':
-    return 'title:ascii'
-  case 'title-contains':
-    return `title:contains:${ condition.text }`
-  }
-}
-
-
-const directExampleAnswerFor = (
-    question:  StoredGekanatorQuestion,
-    post:      Post,
-): GekanatorAnswerValue | null => {
-  if (question.kind !== 'post_similarity')
-    return null
-
-  const direct = question.exampleAnswers?.[String (post.id) as `${ number }`]
-  if (direct)
-    return direct
-
-  if (question.condition.type === 'post-similarity' && question.condition.postId === post.id)
-    return question.condition.answer
-
-  return null
-}
-
-const countBy = <T extends string | number> (values: T[]): Map<T, number> => {
-  const counts = new Map<T, number> ()
-  values.forEach (value => counts.set (value, (counts.get (value) ?? 0) + 1))
-  return counts
-}
-
-
-const median = (values: number[]): number => {
-  const sorted = [...values].sort ((a, b) => a - b)
-  return sorted[Math.floor (sorted.length / 2)] ?? 0
-}
-
-
-const hostOf = (post: Post): string | null => {
-  try
-  {
-    return new URL (post.url).hostname.replace (/^www\./, '')
-  }
-  catch
-  {
-    return null
-  }
-}
-
-
-const originalYearOf = (post: Post): number | null => {
-  const value = post.originalCreatedFrom || post.originalCreatedBefore
-  if (!(value))
-    return null
-
-  const date = new Date (value)
-  if (Number.isNaN (date.getTime ()))
-    return null
-
-  return date.getFullYear ()
-}
-
-
-const originalDateOf = (post: Post): Date | null => {
-  const value = post.originalCreatedFrom || post.originalCreatedBefore
-  if (!(value))
-    return null
-
-  const date = new Date (value)
-  if (Number.isNaN (date.getTime ()))
-    return null
-
-  return date
-}
-
-
-const originalMonthOf = (post: Post): number | null => {
-  const date = originalDateOf (post)
-  if (!(date))
-    return null
-
-  return date.getMonth () + 1
-}
-
-
-const originalMonthDayOf = (post: Post): string | null => {
-  const date = originalDateOf (post)
-  if (!(date))
-    return null
-
-  return `${ date.getMonth () + 1 }-${ date.getDate () }`
-}
-
-
-const tagQuestionKey = ({ category, name }: { category: string; name: string }): string =>
-    `${ category }:${ name }`
-
-
-const tagFromQuestionKey = (key: string): { category: string; name: string } => {
-  const [category, ...rest] = key.split (':')
-  return { category: category ?? '', name: rest.join (':') }
-}
-
-
-const nicoTagLabel = (name: string): string => name.replace (/^nico:/, '')
-
-
-const tagQuestionText = (category: string, label: string): string => {
-  switch (category)
-  {
-  case 'deerjikist':
-    return `作者・ニジラーとして「${ label }」に関係してゐる?`
-  case 'meme':
-    return `元ネタ・ミームとして「${ label }」に関係しさう?`
-  case 'character':
-    return `「${ label }」といふキャラクターが関係してゐる?`
-  case 'material':
-    return `素材として「${ label }」に関係してゐる?`
-  case 'nico':
-    return `ニコニコに「${ label }」といふタグが付いてゐる?`
-  case 'general':
-  case 'meta':
-  default:
-    return `内容として「${ label }」に関係しさう?`
-  }
-}
-
-
-const questionableTag = (post: Post, key: string): boolean => {
-  const { category, name } = tagFromQuestionKey (key)
-
-  return (
-    post.tags.some (tag =>
-	tag.name === name
-	&& tag.category === category
-	&& !(tag.category === 'meta')
-	&& !(tag.name.includes ('タグ希望'))
-	&& !(tag.name.includes ('bot操作'))))
-}
-
-
-const questionMatches = (
-    post:       Post,
-    question:   StoredGekanatorQuestion,
-): boolean => {
-  const directAnswer = directExampleAnswerFor (question, post)
-  if (directAnswer)
-    return question.condition.type === 'post-similarity'
-	? directAnswer === question.condition.answer
-	: directAnswer === 'yes'
-
-  switch (question.condition.type)
-  {
-  case 'tag':
-    return questionableTag (post, question.condition.key)
-  case 'source':
-    return hostOf (post) === question.condition.host
-  case 'original-year':
-    return originalYearOf (post) === question.condition.year
-  case 'original-month':
-    return originalMonthOf (post) === question.condition.month
-  case 'original-month-day':
-    return originalMonthDayOf (post) === question.condition.monthDay
-  case 'title-length-at-least':
-    return (post.title?.length ?? 0) >= question.condition.length
-  case 'title-length-greater-than':
-    return (post.title?.length ?? 0) > question.condition.length
-  case 'title-has-ascii':
-    return /[A-Za-z0-9]/.test (post.title ?? '')
-  case 'title-contains':
-    return (post.title ?? '').includes (question.condition.text)
-  case 'post-similarity':
-    return false
-  }
-}
-
-
-export const expectedAnswerForQuestion = (
-    question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
-): GekanatorAnswerValue | null => {
-  if (!(question) || !(post))
-    return null
-
-  const directAnswer = directExampleAnswerFor (question, post)
-  if (directAnswer)
-    return directAnswer
-
-  switch (question.condition.type)
-  {
-  case 'tag':
-  case 'source':
-  case 'original-year':
-  case 'original-month':
-  case 'original-month-day':
-  case 'title-length-at-least':
-  case 'title-length-greater-than':
-  case 'title-has-ascii':
-  case 'title-contains':
-    return questionMatches (post, question) ? 'yes' : 'no'
-  case 'post-similarity':
-    return null
-  }
-}
-
-
-export const restoreGekanatorQuestion = (
-    question:  StoredGekanatorQuestion,
-): GekanatorQuestion => {
-  const normalizedCondition = normalizeTitleLengthCondition (question.condition)
-  const normalizedQuestion = {
-      ...question,
-      id: normalizedCondition.type === 'title-length-at-least'
-	  ? `title:length-at-least:${ normalizedCondition.length }`
-	  : question.id,
-      condition: normalizedCondition,
-      source: question.source ?? 'default',
-      priorityWeight: question.priorityWeight ?? 1 }
-
-  return {
-      ...normalizedQuestion,
-      test: (post: Post) => questionMatches (post, normalizedQuestion) }
-}
-
-
-export const storeGekanatorQuestion = (
-    question:  GekanatorQuestion,
-): StoredGekanatorQuestion => ({
-  id: question.condition.type === 'title-length-greater-than'
-      ? `title:length-at-least:${ question.condition.length + 1 }`
-      : question.id,
-  text: question.text,
-  kind: question.kind,
-  condition: normalizeTitleLengthCondition (question.condition),
-  source: question.source,
-  priorityWeight: question.priorityWeight,
-  exampleAnswers: question.exampleAnswers })
-
-
-export const fetchGekanatorPosts = async (): Promise<Post[]> => {
-  const data = await apiGet<{ posts: Post[] }> ('/gekanator/posts')
-  return data.posts
-}
-
-
-export const fetchGekanatorQuestions = async (): Promise<StoredGekanatorQuestion[]> => {
-  const data = await apiGet<{ questions: StoredGekanatorQuestion[] }> ('/gekanator/questions')
-  return data.questions
-}
-
-
-export const fetchGekanatorExtraQuestions = async (
-    gameId:  number,
-    nonce?: string,
-): Promise<GekanatorExtraQuestion[]> => {
-  const data = await apiGet<{ questions: GekanatorExtraQuestion[] }> (
-      `/gekanator/games/${ gameId }/extra_questions`,
-      { params: nonce ? { nonce } : undefined })
-  return data.questions
-}
-
-
-export const buildGekanatorQuestions = (
-    posts:    Post[],
-    options:  BuildGekanatorQuestionsOptions = { },
-): GekanatorQuestion[] => {
-  const {
-      includeTitleContains = true,
-      tagQuestionCap = 192,
-      titleContainsCap = 24,
-      totalQuestionCap = Number.POSITIVE_INFINITY,
-  } = options
-  const tagCounts = countBy (posts.flatMap (post =>
-      post.tags
-      .filter (tag =>
-	  !(tag.category === 'meta')
-	  && !(tag.name.includes ('タグ希望'))
-	  && !(tag.name.includes ('bot操作')))
-      .map (tag => tagQuestionKey (tag))))
-  const hosts = countBy (posts.map (hostOf).filter ((host): host is string => Boolean (host)))
-  const originalYears = countBy (
-      posts
-      .map (originalYearOf)
-      .filter ((year): year is number => year !== null))
-  const originalMonths = countBy (
-      posts
-      .map (originalMonthOf)
-      .filter ((month): month is number => month !== null))
-  const originalMonthDays = countBy (
-      posts
-      .map (originalMonthDayOf)
-      .filter ((monthDay): monthDay is string => monthDay !== null))
-  const titleLengthMedian = median (posts.map (post => post.title?.length ?? 0))
-  const titleWordCounts =
-      includeTitleContains
-	? countBy (
-	    posts.flatMap (post =>
-		Array.from (
-		    new Set (
-			(post.title ?? '')
-			.match (
-			    /[\p{Script=Han}\p{Script=Hiragana}\p{Script=Katakana}A-Za-z0-9]{2,}/gu)
-			?? []))))
-	: new Map<string, number> ()
-
-  const usefulEntries = <T extends string | number> (
-      counts:  Map<T, number>,
-      cap:     number,
-  ) =>
-      [...counts.entries ()]
-      .filter (([, count]) => count > 0 && count < posts.length)
-      .sort ((a, b) => Math.abs (posts.length / 2 - a[1])
-	       - Math.abs (posts.length / 2 - b[1]))
-      .slice (0, cap)
-
-  const tagQuestions = usefulEntries (tagCounts, Math.max (tagQuestionCap, 80))
-      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
-      .slice (0, tagQuestionCap)
-      .map (([key]) => {
-	const { category, name } = tagFromQuestionKey (String (key))
-	const label = category === 'nico' ? nicoTagLabel (name) : name
-
-	return {
-	    id:   `tag:${ key }`,
-	    text: tagQuestionText (category, label),
-	    kind: 'tag' as const,
-	    condition: { type: 'tag' as const, key: String (key) },
-	    source: 'default' as const,
-	    priorityWeight: 1,
-	    test: (post: Post) => questionableTag (post, String (key)) }
-      })
-
-  const sourceQuestions = usefulEntries (hosts, 20)
-      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
-      .slice (0, 20)
-      .map (([host]) => ({
-	  id:   `source:${ host }`,
-	  text: `${ host } の投稿を思ひ浮かべてゐる?`,
-	  kind: 'source' as const,
-	  condition: { type: 'source' as const, host },
-	  source: 'default' as const,
-	  priorityWeight: 1,
-	  test: (post: Post) => hostOf (post) === host }))
-
-  const originalYearQuestions = usefulEntries (originalYears, 20)
-      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
-      .slice (0, 20)
-      .map (([year]) => ({
-	  id:   `original-year:${ year }`,
-	  text: `オリジナルの投稿年は ${ year } 年?`,
-	  kind: 'original_date' as const,
-	  condition: { type: 'original-year' as const, year },
-	  source: 'default' as const,
-	  priorityWeight: 1,
-	  test: (post: Post) => originalYearOf (post) === year }))
-
-  const originalMonthQuestions = usefulEntries (originalMonths, 20)
-      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
-      .slice (0, 20)
-      .map (([month]) => ({
-	  id:   `original-month:${ month }`,
-	  text: `オリジナルの投稿月は ${ month } 月?`,
-	  kind: 'original_date' as const,
-	  condition: { type: 'original-month' as const, month },
-	  source: 'default' as const,
-	  priorityWeight: 1,
-	  test: (post: Post) => originalMonthOf (post) === month }))
-
-  const originalMonthDayQuestions = usefulEntries (originalMonthDays, 20)
-      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
-      .slice (0, 20)
-      .map (([monthDay]) => {
-	const [month, day] = String (monthDay).split ('-')
-
-	return {
-	    id:   `original-month-day:${ monthDay }`,
-	    text: `オリジナルの投稿日は ${ month } 月 ${ day } 日?`,
-	    kind: 'original_date' as const,
-	    condition: { type: 'original-month-day' as const, monthDay: String (monthDay) },
-	    source: 'default' as const,
-	    priorityWeight: 1,
-	    test: (post: Post) => originalMonthDayOf (post) === monthDay }
-      })
-
-  const titleQuestions = [
-      {
-	  id:   `title:length-at-least:${ titleLengthMedian }`,
-	  text: `タイトルは ${ titleLengthMedian } 文字以上?`,
-	  kind: 'title' as const,
-	  condition: {
-	      type: 'title-length-at-least' as const,
-	      length: titleLengthMedian },
-	  source: 'default' as const,
-	  priorityWeight: 1,
-	  test: (post: Post) => (post.title?.length ?? 0) >= titleLengthMedian },
-      {
-	  id:   'title:ascii',
-	  text: '題名に英数字が混じってゐる?',
-	  kind: 'title' as const,
-	  condition: { type: 'title-has-ascii' as const },
-	  source: 'default' as const,
-	  priorityWeight: 1,
-	  test: (post: Post) => /[A-Za-z0-9]/.test (post.title ?? '') }]
-      .filter (question => {
-	const yes = posts.filter (post => question.test (post)).length
-	const no = posts.length - yes
-	return yes >= 2 && no >= 2 && yes <= posts.length * .7 && no <= posts.length * .7
-      })
-  const titleContainsQuestions =
-      includeTitleContains
-	? usefulEntries (titleWordCounts, titleContainsCap)
-	    .filter (([word, count]) =>
-		String (word).length <= 24
-		&& count >= 2
-		&& count <= Math.max (2, posts.length * .7))
-	    .slice (0, titleContainsCap)
-	    .map (([word]) => ({
-		id:   `title:contains:${ word }`,
-		text: `題名に「${ word }」が含まれる?`,
-		kind: 'title' as const,
-		condition: { type: 'title-contains' as const, text: String (word) },
-		source: 'default' as const,
-		priorityWeight: .96,
-		test: (post: Post) => (post.title ?? '').includes (String (word)) }))
-	: []
-
-  return [
-      ...sourceQuestions,
-      ...originalYearQuestions,
-      ...originalMonthQuestions,
-      ...originalMonthDayQuestions,
-      ...titleQuestions,
-      ...titleContainsQuestions,
-      ...tagQuestions].slice (0, totalQuestionCap)
-}
-
-
-export const saveGekanatorGame = async ({
-    guessedPostId,
-    correctPostId,
-    answers,
-}: {
-    guessedPostId:  number
-    correctPostId:  number
-    answers:        GekanatorAnswerLog[]
-}): Promise<{ id: number }> =>
-    await apiPost ('/gekanator/games', {
-	guessed_post_id: guessedPostId,
-	correct_post_id: correctPostId,
-	answers: answers.map (answer => ({
-	    question_id: answer.questionId,
-	    question_text: answer.questionText,
-	    question_condition: answer.questionCondition ?? null,
-	    answer: answer.answer,
-	    original_answer: answer.originalAnswer })) })
-
-
-export const saveGekanatorQuestionSuggestion = async ({
-    gekanatorGameId,
-    questionText,
-    answer,
-}: {
-    gekanatorGameId:  number
-    questionText:     string
-    answer:           GekanatorAnswerValue
-}): Promise<{ id: number; count: number }> =>
-    await apiPost ('/gekanator/question_suggestions', {
-	gekanator_game_id: gekanatorGameId,
-	question_text: questionText,
-	answer })
-
-
-export const saveGekanatorExtraQuestionAnswers = async ({
-    gameId,
-    answers,
-}: {
-    gameId:   number
-    answers:  { questionId: number; answer: GekanatorAnswerValue }[]
-}) =>
-    await apiPost (`/gekanator/games/${ gameId }/extra_question_answers`, {
-	answers: answers.map (item => ({
-	    question_id: item.questionId,
-	    answer: item.answer })) })

frontend/src/lib/gekanatorCandidateRecovery.test.ts

@@ -1,151 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import {
-    candidatePostsFor,
-    hardFilteredPostsForAnswer,
-    recoverCandidatePosts,
-} from '@/lib/gekanatorCandidateRecovery'
-
-import type {
-    GekanatorAnswerLog,
-    GekanatorAnswerValue,
-    GekanatorQuestion,
-} from '@/lib/gekanator'
-import type { Post } from '@/types'
-
-
-const post = (id: number): Post => ({
-  id,
-  versionNo: 1,
-  url: `https://example.com/posts/${ id }`,
-  title: `post ${ id }`,
-  thumbnail: null,
-  thumbnailBase: null,
-  tags: [],
-  viewed: false,
-  related: [],
-  originalCreatedFrom: null,
-  originalCreatedBefore: null,
-  createdAt: '2026-06-10T00:00:00.000Z',
-  updatedAt: '2026-06-10T00:00:00.000Z',
-  uploadedUser: null,
-})
-
-
-const postSimilarityQuestion = (
-    id:       string,
-    answers:  Record<`${ number }`, GekanatorAnswerValue>,
-): GekanatorQuestion => ({
-  id,
-  text: `${ id }?`,
-  kind: 'post_similarity',
-  condition: {
-      type: 'post-similarity',
-      postId: 9999,
-      answer: 'yes',
-      threshold: 0.65 },
-  source: 'user_suggested',
-  priorityWeight: 1,
-  exampleAnswers: answers,
-  test: candidate => answers[String (candidate.id) as `${ number }`] === 'yes',
-})
-
-
-const answer = (
-    question:  GekanatorQuestion,
-    value:     GekanatorAnswerValue,
-): GekanatorAnswerLog => ({
-  questionId: question.id,
-  questionText: question.text,
-  questionCondition: question.condition,
-  answer: value,
-  originalAnswer: value,
-})
-
-
-describe('candidatePostsFor', () => {
-  it('lets recovered candidates ignore old answers but not later answers', () => {
-    const posts = [post (1), post (2), post (3)]
-    const oldQuestion = postSimilarityQuestion ('old', {
-	1: 'no',
-	2: 'yes',
-	3: 'yes',
-    })
-    const laterQuestion = postSimilarityQuestion ('later', {
-	1: 'no',
-	2: 'no',
-	3: 'yes',
-    })
-
-    const candidates = candidatePostsFor ({
-	posts,
-	questions: [oldQuestion, laterQuestion],
-	answers: [answer (oldQuestion, 'yes'), answer (laterQuestion, 'yes')],
-	softenedQuestionIds: new Set (),
-	rejectedPostIds: new Set (),
-	recoveredCandidatePosts: new Map ([
-	    [1, 1],
-	    [3, 1],
-	]) })
-
-    expect(candidates.map (candidate => candidate.id)).toEqual ([3])
-  })
-
-  it('does not let recovered candidates bypass explicit rejected posts', () => {
-    const posts = [post (1), post (2)]
-    const question = postSimilarityQuestion ('question', {
-	1: 'yes',
-	2: 'yes',
-    })
-
-    const candidates = candidatePostsFor ({
-	posts,
-	questions: [question],
-	answers: [answer (question, 'yes')],
-	softenedQuestionIds: new Set (),
-	rejectedPostIds: new Set ([1]),
-	recoveredCandidatePosts: new Map ([[1, 1]]) })
-
-    expect(candidates.map (candidate => candidate.id)).toEqual ([2])
-  })
-})
-
-
-describe('hardFilteredPostsForAnswer', () => {
-  it('returns zero candidates without falling back to the original pool', () => {
-    const posts = [post (1), post (2)]
-    const question = postSimilarityQuestion ('question', {
-	1: 'yes',
-	2: 'yes',
-    })
-
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'no',
-    })).toEqual ([])
-  })
-})
-
-
-describe('recoverCandidatePosts', () => {
-  it('recovers high-score non-rejected, non-eligible candidates in staged batches', () => {
-    const posts = Array.from ({ length: 10 }, (_value, index) => post (index + 1))
-    const scores = new Map (posts.map (candidate => [candidate.id, candidate.id]))
-
-    const recovered = recoverCandidatePosts ({
-	posts,
-	scores,
-	rejectedPostIds: new Set ([10]),
-	recoveredCandidatePosts: new Map ([[8, 1]]),
-	eligiblePostIds: new Set ([9]),
-	answerCountAtRecovery: 2,
-	recoveryStepCount: 0,
-    })
-
-    expect(recovered?.recoveryStepCount).toBe (1)
-    expect([...(recovered?.recoveredCandidatePosts.keys () ?? [])])
-      .toEqual ([8, 7, 6, 5, 4, 3, 2])
-    expect(recovered?.recoveredCandidatePosts.get (7)).toBe (2)
-  })
-})

frontend/src/lib/gekanatorCandidateRecovery.ts

@@ -1,156 +0,0 @@
-import { expectedAnswerForQuestion } from '@/lib/gekanator'
-
-import type {
-    GekanatorAnswerLog,
-    GekanatorAnswerValue,
-    GekanatorQuestion,
-} from '@/lib/gekanator'
-import type { Post } from '@/types'
-
-
-export type RecoveredCandidatePost = {
-    postId:                number
-    answerCountAtRecovery: number }
-
-
-export const candidatePostsFor = ({
-    posts,
-    questions,
-    answers,
-    softenedQuestionIds,
-    rejectedPostIds,
-    recoveredCandidatePosts,
-}: {
-    posts:                   Post[]
-    questions:               GekanatorQuestion[]
-    answers:                 GekanatorAnswerLog[]
-    softenedQuestionIds:     Set<string>
-    rejectedPostIds:         Set<number>
-    recoveredCandidatePosts: Map<number, number>
-}): Post[] => {
-  const questionById = new Map (questions.map (question => [question.id, question]))
-
-  return posts.filter (post => {
-    if (rejectedPostIds.has (post.id))
-      return false
-
-    const answerCountAtRecovery = recoveredCandidatePosts.get (post.id)
-
-    return answers.every ((answer, index) => {
-      if (answerCountAtRecovery !== undefined && index < answerCountAtRecovery)
-	return true
-
-      if (softenedQuestionIds.has (answer.questionId))
-	return true
-
-      const question = questionById.get (answer.questionId)
-      if (!(question))
-	return true
-
-      switch (answer.answer)
-      {
-      case 'yes':
-      case 'no': {
-	const expected = expectedAnswerForQuestion (question, post)
-	return expected === null || expected === 'unknown' || expected === answer.answer
-      }
-      default:
-	return true
-      }
-    })
-  })
-}
-
-
-export const hardFilteredPostsForAnswer = ({
-    posts,
-    question,
-    answer,
-}: {
-    posts:     Post[]
-    question:  GekanatorQuestion
-    answer:    GekanatorAnswerValue
-}): Post[] => {
-  if (answer === 'unknown')
-    return posts
-
-  return posts.filter (post => {
-    const expected = expectedAnswerForQuestion (question, post)
-    return expected === null || expected === 'unknown' || expected === answer
-  })
-}
-
-
-const concreteAnswerOptions: GekanatorAnswerValue[] = [
-    'yes',
-    'no',
-    'partial',
-    'probably_no']
-
-
-export const allConcreteAnswerOptionsExhausted = (
-    posts:      Post[],
-    question:   GekanatorQuestion | null,
-): boolean => {
-  if (!(question))
-    return false
-
-  return concreteAnswerOptions.every (answer =>
-      hardFilteredPostsForAnswer ({ posts, question, answer }).length === 0)
-}
-
-
-const nextRecoveryTargetSize = (recoveryStepCount: number): number =>
-    6 * (2 ** recoveryStepCount)
-
-
-export const recoverCandidatePosts = ({
-    posts,
-    scores,
-    rejectedPostIds,
-    recoveredCandidatePosts,
-    eligiblePostIds,
-    answerCountAtRecovery,
-    recoveryStepCount,
-}: {
-    posts:                   Post[]
-    scores:                  Map<number, number>
-    rejectedPostIds:         Set<number>
-    recoveredCandidatePosts: Map<number, number>
-    eligiblePostIds:         Set<number>
-    answerCountAtRecovery:   number
-    recoveryStepCount:       number
-}): {
-    recoveredCandidatePosts: Map<number, number>
-    recoveryStepCount:       number
-} | null => {
-  const recovered = new Map (recoveredCandidatePosts)
-  const targetSize = nextRecoveryTargetSize (recoveryStepCount)
-  const countedPostIds = new Set ([
-      ...eligiblePostIds,
-      ...recovered.keys ()])
-  const addCount = targetSize - countedPostIds.size
-  if (addCount <= 0)
-    return {
-	recoveredCandidatePosts: recovered,
-	recoveryStepCount: recoveryStepCount + 1 }
-
-  const candidates = posts
-      .filter (post =>
-	  !(rejectedPostIds.has (post.id))
-	  && !(eligiblePostIds.has (post.id))
-	  && !(recovered.has (post.id)))
-      .sort ((a, b) =>
-	  (scores.get (b.id) ?? Number.NEGATIVE_INFINITY)
-	      - (scores.get (a.id) ?? Number.NEGATIVE_INFINITY))
-      .slice (0, addCount)
-
-  if (candidates.length === 0)
-    return null
-
-  candidates.forEach (post => recovered.set (post.id, answerCountAtRecovery))
-
-  return {
-      recoveredCandidatePosts: recovered,
-      recoveryStepCount: recoveryStepCount + 1 }
-}

frontend/src/lib/gekanatorQuestionFilters.ts

@@ -1,167 +0,0 @@
-import { titleLengthMinimumForCondition } from '@/lib/gekanator'
-
-import type {
-    GekanatorAnswerLog,
-    GekanatorAnswerValue,
-    GekanatorQuestion,
-} from '@/lib/gekanator'
-
-
-export const monthForCondition = (
-    condition:  GekanatorQuestion['condition'],
-): number | null => {
-  if (condition.type === 'original-month')
-    return condition.month
-
-  if (condition.type !== 'original-month-day')
-    return null
-
-  const month = Number (condition.monthDay.split ('-')[0])
-  return Number.isInteger (month) ? month : null
-}
-
-
-const isTitleLengthContradiction = (
-    candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
-  const candidateLength = titleLengthMinimumForCondition (candidate)
-  const previousLength = titleLengthMinimumForCondition (previous)
-  if (candidateLength === null || previousLength === null)
-    return false
-
-  switch (answer)
-  {
-  case 'yes':
-    return candidateLength <= previousLength
-  case 'no':
-    return candidateLength >= previousLength
-  default:
-    return false
-  }
-}
-
-
-const isQuestionRedundantAfterAnswers = (
-    question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
-): boolean => answers.some (answer => {
-  const previous = answer.questionCondition
-  return previous !== undefined
-      && isTitleLengthContradiction (question.condition, previous, answer.answer)
-})
-
-
-const isSourceFactBlocked = (
-    candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
-  if (candidate.type !== 'source' || previous.type !== 'source')
-    return false
-
-  switch (answer)
-  {
-  case 'yes':
-    return true
-  case 'no':
-    return candidate.host === previous.host
-  default:
-    return false
-  }
-}
-
-
-const isOriginalYearFactBlocked = (
-    candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
-  if (candidate.type !== 'original-year' || previous.type !== 'original-year')
-    return false
-
-  switch (answer)
-  {
-  case 'yes':
-    return true
-  case 'no':
-    return candidate.year === previous.year
-  default:
-    return false
-  }
-}
-
-
-const isOriginalMonthFactBlocked = (
-    candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
-  switch (answer)
-  {
-  case 'yes':
-    if (previous.type === 'original-month')
-      {
-	if (candidate.type === 'original-month')
-	  return true
-
-	if (candidate.type === 'original-month-day')
-	  return monthForCondition (candidate) !== previous.month
-
-	return false
-      }
-
-    if (previous.type === 'original-month-day')
-      return candidate.type === 'original-month'
-	  || candidate.type === 'original-month-day'
-
-    return false
-  case 'no':
-    if (previous.type === 'original-month')
-      {
-	if (candidate.type === 'original-month')
-	  return candidate.month === previous.month
-
-	if (candidate.type === 'original-month-day')
-	  return monthForCondition (candidate) === previous.month
-
-	return false
-      }
-
-    if (previous.type === 'original-month-day')
-      return candidate.type === 'original-month-day'
-	  && candidate.monthDay === previous.monthDay
-
-    return false
-  default:
-    return false
-  }
-}
-
-
-const isFactQuestionBlocked = (
-    candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
-  if (!(answer === 'yes' || answer === 'no'))
-    return false
-
-  return isSourceFactBlocked (candidate, previous, answer)
-      || isOriginalYearFactBlocked (candidate, previous, answer)
-      || isOriginalMonthFactBlocked (candidate, previous, answer)
-}
-
-
-export const isQuestionHardFilteredAfterAnswers = (
-    question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
-): boolean => answers.some (answer => {
-  const previous = answer.questionCondition
-  if (previous === undefined)
-    return false
-
-  return isQuestionRedundantAfterAnswers (question, [answer])
-      || isFactQuestionBlocked (question.condition, previous, answer.answer)
-})

frontend/src/lib/queryKeys.ts

@@ -8,13 +8,6 @@ export const postsKeys = {
     changes:  (p: { post?: string; tag?: string; page: number; limit: number }) =>
 		  ['posts', 'changes', p] as const }
 
-export const gekanatorKeys = {
-    root:      ['gekanator'] as const,
-    posts:     () => ['gekanator', 'posts'] as const,
-    questions: () => ['gekanator', 'questions'] as const,
-    extraQuestions: (gameId: number, nonce: string) =>
-		       ['gekanator', 'games', gameId, 'extra-questions', nonce] as const }
-
 export const tagsKeys = {
     root:         ['tags'] as const,
     index:        (p: FetchTagsParams) => ['tags', 'index', p] as const,

frontend/src/lib/users.ts

@@ -2,7 +2,6 @@ import type { User, UserRole } from '@/types'
 
 const CONTENT_EDITOR_ROLES: readonly UserRole[] = ['admin', 'member']
 
-
 export const canEditContent = (
     user: Pick<User, 'role'> | null | undefined,
 ): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)

frontend/src/pages/GekanatorPage.test.tsx

@@ -1,154 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { isQuestionHardFilteredAfterAnswers } from '@/lib/gekanatorQuestionFilters'
-
-import type {
-    GekanatorAnswerLog,
-    GekanatorAnswerValue,
-    GekanatorQuestion,
-    GekanatorQuestionCondition,
-} from '@/lib/gekanator'
-
-
-const question = (
-    condition:  GekanatorQuestionCondition,
-): GekanatorQuestion => ({
-  id: `${ condition.type }:candidate`,
-  text: 'candidate?',
-  kind: condition.type === 'source'
-      ? 'source'
-      : condition.type.startsWith ('original-')
-	? 'original_date'
-	: condition.type.startsWith ('title-')
-	  ? 'title'
-	  : 'tag',
-  condition,
-  source: 'default',
-  priorityWeight: 1,
-  test: () => false,
-})
-
-
-const answer = (
-    condition:  GekanatorQuestionCondition,
-    value:      GekanatorAnswerValue,
-): GekanatorAnswerLog => ({
-  questionId: 'previous',
-  questionText: 'previous?',
-  questionCondition: condition,
-  answer: value,
-  originalAnswer: value,
-})
-
-
-const blocked = (
-    candidate:  GekanatorQuestionCondition,
-    previous:   GekanatorQuestionCondition,
-    value:      GekanatorAnswerValue,
-): boolean =>
-    isQuestionHardFilteredAfterAnswers (question (candidate), [answer (previous, value)])
-
-
-describe('isQuestionHardFilteredAfterAnswers', () => {
-  it('blocks only contradictory or redundant month questions after a yes answer', () => {
-    const previous: GekanatorQuestionCondition = { type: 'original-month', month: 12 }
-
-    expect(blocked ({ type: 'original-month', month: 12 }, previous, 'yes')).toBe(true)
-    expect(blocked ({ type: 'original-month', month: 2 }, previous, 'yes')).toBe(true)
-    expect(blocked ({ type: 'original-month-day', monthDay: '2-14' }, previous, 'yes'))
-      .toBe(true)
-    expect(blocked ({ type: 'original-month-day', monthDay: '12-25' }, previous, 'yes'))
-      .toBe(false)
-    expect(blocked ({ type: 'original-year', year: 2024 }, previous, 'yes')).toBe(false)
-    expect(blocked ({ type: 'source', host: 'example.com' }, previous, 'yes')).toBe(false)
-    expect(blocked ({ type: 'tag', key: 'character:喜多郁代' }, previous, 'yes')).toBe(false)
-  })
-
-  it('blocks same-month facts after a no answer', () => {
-    const previous: GekanatorQuestionCondition = { type: 'original-month', month: 12 }
-
-    expect(blocked ({ type: 'original-month', month: 12 }, previous, 'no')).toBe(true)
-    expect(blocked ({ type: 'original-month', month: 2 }, previous, 'no')).toBe(false)
-    expect(blocked ({ type: 'original-month-day', monthDay: '12-25' }, previous, 'no'))
-      .toBe(true)
-    expect(blocked ({ type: 'original-month-day', monthDay: '2-14' }, previous, 'no'))
-      .toBe(false)
-  })
-
-  it('blocks all month and month-day questions after a month-day yes answer', () => {
-    const previous: GekanatorQuestionCondition = {
-      type: 'original-month-day',
-      monthDay: '12-25',
-    }
-
-    expect(blocked ({ type: 'original-month', month: 12 }, previous, 'yes')).toBe(true)
-    expect(blocked ({ type: 'original-month', month: 2 }, previous, 'yes')).toBe(true)
-    expect(blocked ({ type: 'original-month-day', monthDay: '12-25' }, previous, 'yes'))
-      .toBe(true)
-    expect(blocked ({ type: 'original-month-day', monthDay: '12-26' }, previous, 'yes'))
-      .toBe(true)
-  })
-
-  it('blocks the same month-day only after a month-day no answer', () => {
-    const previous: GekanatorQuestionCondition = {
-      type: 'original-month-day',
-      monthDay: '12-25',
-    }
-
-    expect(blocked ({ type: 'original-month-day', monthDay: '12-25' }, previous, 'no'))
-      .toBe(true)
-    expect(blocked ({ type: 'original-month-day', monthDay: '12-26' }, previous, 'no'))
-      .toBe(false)
-    expect(blocked ({ type: 'original-month', month: 12 }, previous, 'no')).toBe(false)
-  })
-
-  it('blocks year and source as single-value facts', () => {
-    expect(blocked (
-      { type: 'original-year', year: 2025 },
-      { type: 'original-year', year: 2024 },
-      'yes',
-    )).toBe(true)
-    expect(blocked (
-      { type: 'original-year', year: 2024 },
-      { type: 'original-year', year: 2024 },
-      'no',
-    )).toBe(true)
-    expect(blocked (
-      { type: 'source', host: 'b.example' },
-      { type: 'source', host: 'a.example' },
-      'yes',
-    )).toBe(true)
-    expect(blocked (
-      { type: 'source', host: 'b.example' },
-      { type: 'source', host: 'a.example' },
-      'no',
-    )).toBe(false)
-  })
-
-  it('does not hard-filter partial, probably_no, or unknown fact answers', () => {
-    const previous: GekanatorQuestionCondition = { type: 'original-month', month: 12 }
-    const candidate: GekanatorQuestionCondition = { type: 'original-month', month: 2 }
-
-    expect(blocked (candidate, previous, 'partial')).toBe(false)
-    expect(blocked (candidate, previous, 'probably_no')).toBe(false)
-    expect(blocked (candidate, previous, 'unknown')).toBe(false)
-  })
-
-  it('keeps title-length hard redundancy for yes and no only', () => {
-    const previous: GekanatorQuestionCondition = {
-      type: 'title-length-at-least',
-      length: 30,
-    }
-
-    expect(blocked ({ type: 'title-length-at-least', length: 20 }, previous, 'yes'))
-      .toBe(true)
-    expect(blocked ({ type: 'title-length-at-least', length: 40 }, previous, 'yes'))
-      .toBe(false)
-    expect(blocked ({ type: 'title-length-at-least', length: 40 }, previous, 'no'))
-      .toBe(true)
-    expect(blocked ({ type: 'title-length-at-least', length: 20 }, previous, 'no'))
-      .toBe(false)
-    expect(blocked ({ type: 'title-length-at-least', length: 20 }, previous, 'partial'))
-      .toBe(false)
-  })
-})

frontend/src/pages/theatres/TheatreDetailPage.test.tsx

@@ -1,298 +0,0 @@
-import { act, fireEvent, screen, waitFor } from '@testing-library/react'
-import { Route, Routes } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import TheatreDetailPage from '@/pages/theatres/TheatreDetailPage'
-import { buildPost,
-	 buildTheatre,
-	 buildTheatreComment,
-	 buildTheatreInfo,
-	 buildTheatrePostSelectionWeights,
-	 buildTheatreProgramme,
-	 buildUser } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-import type { ReactNode } from 'react'
-
-const api = vi.hoisted (() => ({
-  apiDelete:  vi.fn (),
-  apiGet:     vi.fn (),
-  apiPatch:   vi.fn (),
-  apiPost:    vi.fn (),
-  apiPut:     vi.fn (),
-  isApiError: vi.fn (() => false),
-}))
-
-const postsApi = vi.hoisted (() => ({
-  fetchPost: vi.fn (),
-}))
-
-const dialogue = vi.hoisted (() => ({
-  confirm: vi.fn (),
-}))
-
-const postEmbed = vi.hoisted (() => ({
-  props: vi.fn (),
-  play:  vi.fn (),
-  seek:  vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/components/dialogues/DialogueProvider', () => ({
-  useDialogue: () => dialogue,
-}))
-vi.mock ('@/components/PostEmbed', () => ({
-  default: (props: {
-    ref?: { current: unknown }
-    post: { title: string | null; url: string }
-  }) => {
-    postEmbed.props (props)
-    if (props.ref)
-      props.ref.current = {
-        play: postEmbed.play,
-        seek: postEmbed.seek,
-      }
-
-    return <div>Embed:{props.post.title || props.post.url}</div>
-  },
-}))
-vi.mock ('@/components/PostEditForm', () => ({
-  default: () => <div>Post edit form</div>,
-}))
-vi.mock ('framer-motion', () => ({
-  motion: {
-    aside: ({ children }: { children?: ReactNode }) => <aside>{children}</aside>,
-    div:   ({ children }: { children?: ReactNode }) => <div>{children}</div>,
-    main:  ({ children }: { children?: ReactNode }) => <main>{children}</main>,
-  },
-}))
-
-const currentPost = buildPost ({
-  id:    10,
-  title: '上映中の投稿',
-  url:   'https://www.nicovideo.jp/watch/sm10',
-})
-const theatre = buildTheatre ({ id: 7, name: '上映室' })
-const programme = buildTheatreProgramme ({
-  theatreId: 7,
-  position:  3,
-  post:      currentPost,
-})
-const weights = buildTheatrePostSelectionWeights ({
-  lightestPosts: [{
-    post:    currentPost,
-    penalty: 2,
-    weight:  0.5,
-    tags:    [],
-  }],
-})
-
-const renderPage = (user = buildUser ({ id: 1, role: 'member' })) =>
-  renderWithProviders (
-      <Routes>
-        <Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
-      </Routes>,
-      { route: '/theatres/7' },
-  )
-
-const mockDefaultApi = () => {
-  api.apiGet.mockImplementation ((path: string) => {
-    switch (path)
-    {
-    case '/theatres/7':
-      return Promise.resolve (theatre)
-
-    case '/theatres/7/comments':
-      return Promise.resolve ([
-        buildTheatreComment ({
-          theatreId: 7,
-          no:        2,
-          user:      { id: 1, name: 'tester' },
-          content:   '視聴コメント',
-        }),
-      ])
-
-    case '/theatres/7/programmes':
-      return Promise.resolve ([programme])
-
-    case '/theatres/7/post_selection_weights':
-      return Promise.resolve (weights)
-
-    default:
-      return Promise.reject (new Error (`Unexpected GET ${ path }`))
-    }
-  })
-
-  api.apiPut.mockImplementation ((path: string) => {
-    switch (path)
-    {
-    case '/theatres/7/watching':
-      return Promise.resolve (buildTheatreInfo ({
-        postId:        currentPost.id,
-        postStartedAt: '2026-01-02T03:04:05.000Z',
-        postElapsedMs: 1_000,
-        watchingUsers: [{ id: 1, name: 'tester' }],
-        skipVote:      {
-          votesCount:         0,
-          requiredCount:      2,
-          watchingUsersCount: 1,
-          voted:              false,
-        },
-      }))
-
-    case '/theatres/7/skip_vote':
-      return Promise.resolve (buildTheatreInfo ({
-        postId:        currentPost.id,
-        postStartedAt: '2026-01-02T03:04:05.000Z',
-        postElapsedMs: 2_000,
-        watchingUsers: [{ id: 1, name: 'tester' }],
-        skipVote:      {
-          votesCount:         1,
-          requiredCount:      2,
-          watchingUsersCount: 1,
-          voted:              true,
-        },
-      }))
-
-    default:
-      return Promise.reject (new Error (`Unexpected PUT ${ path }`))
-    }
-  })
-
-  api.apiDelete.mockResolvedValue (undefined)
-  api.apiPatch.mockResolvedValue (undefined)
-  api.apiPost.mockResolvedValue (undefined)
-  postsApi.fetchPost.mockResolvedValue (currentPost)
-  dialogue.confirm.mockResolvedValue (true)
-}
-
-describe ('TheatreDetailPage', () => {
-  beforeEach (() => {
-    vi.useRealTimers ()
-    vi.clearAllMocks ()
-    mockDefaultApi ()
-  })
-
-  it ('loads theatre state, comments, current post, programme history, and weights', async () => {
-    renderPage ()
-
-    expect (await screen.findByText ('上映会場『上映室』')).toBeInTheDocument ()
-    expect (await screen.findByText ('Embed:上映中の投稿')).toBeInTheDocument ()
-    expect (screen.getAllByText ('視聴コメント')[0]).toBeInTheDocument ()
-    expect (screen.getAllByText ('上映中の投稿')[0]).toBeInTheDocument ()
-    expect (screen.getByText ('penalty 2')).toBeInTheDocument ()
-
-    await waitFor (() => {
-      expect (postsApi.fetchPost).toHaveBeenCalledWith ('10')
-    })
-  })
-
-  it ('votes to skip the current post', async () => {
-    renderPage ()
-
-    await screen.findByText ('Embed:上映中の投稿')
-
-    fireEvent.click (screen.getByRole ('button', { name: 'スキップ 0 / 2' }))
-
-    await waitFor (() => {
-      expect (api.apiPut).toHaveBeenCalledWith (
-          '/theatres/7/skip_vote',
-          { post_id: 10 },
-      )
-    })
-    expect (await screen.findByRole ('button', { name: 'スキップ取消 1 / 2' }))
-      .toBeInTheDocument ()
-  })
-
-  it ('does not seek to zero while applying video length from the player', async () => {
-    api.apiPut.mockImplementation ((path: string) => {
-      switch (path)
-      {
-      case '/theatres/7/watching':
-        return Promise.resolve (buildTheatreInfo ({
-          hostFlg:       true,
-          postId:        currentPost.id,
-          postStartedAt: '2026-01-02T03:04:05.000Z',
-          postElapsedMs: 7_000,
-          watchingUsers: [{ id: 1, name: 'tester' }],
-          skipVote:      {
-            votesCount:         0,
-            requiredCount:      2,
-            watchingUsersCount: 1,
-            voted:              false,
-          },
-        }))
-
-      default:
-        return Promise.reject (new Error (`Unexpected PUT ${ path }`))
-      }
-    })
-
-    renderPage ()
-    await screen.findByText ('Embed:上映中の投稿')
-
-    const props = postEmbed.props.mock.calls.at (-1)![0]
-
-    act (() => {
-      props.onVideoReady (120_000)
-      props.onPlaybackChange (0)
-    })
-
-    const seekMs = postEmbed.seek.mock.calls[0][0]
-    expect (seekMs).toBeGreaterThanOrEqual (7_000)
-    expect (seekMs).toBeLessThan (10_000)
-    expect (postEmbed.seek).not.toHaveBeenCalledWith (0)
-  })
-
-  it ('does not advance host post while video length is unknown', async () => {
-    api.apiPut.mockImplementation ((path: string) => {
-      switch (path)
-      {
-      case '/theatres/7/watching':
-        return Promise.resolve (buildTheatreInfo ({
-          hostFlg:       true,
-          postId:        currentPost.id,
-          postStartedAt: '2026-01-02T03:04:05.000Z',
-          postElapsedMs: 4_000,
-          watchingUsers: [{ id: 1, name: 'tester' }],
-          skipVote:      {
-            votesCount:         0,
-            requiredCount:      2,
-            watchingUsersCount: 1,
-            voted:              false,
-          },
-        }))
-
-      default:
-        return Promise.reject (new Error (`Unexpected PUT ${ path }`))
-      }
-    })
-
-    renderPage ()
-
-    await screen.findByText ('Embed:上映中の投稿')
-    await waitFor (() => {
-      expect (api.apiPut).toHaveBeenCalledWith ('/theatres/7/watching')
-    })
-
-    await waitFor (() => {
-      expect (api.apiPut).toHaveBeenCalledTimes (2)
-    }, { timeout: 2_500 })
-    expect (api.apiPatch).not.toHaveBeenCalledWith ('/theatres/7/next_post')
-  })
-
-  it ('deletes an owned comment after confirmation', async () => {
-    renderPage ()
-
-    fireEvent.click ((await screen.findAllByLabelText ('コメントを削除'))[0])
-
-    await waitFor (() => {
-      expect (dialogue.confirm).toHaveBeenCalled ()
-    })
-    await waitFor (() => {
-      expect (api.apiDelete).toHaveBeenCalledWith ('/theatres/7/comments/2')
-    })
-    expect (await screen.findAllByText ('削除されました．')).toHaveLength (2)
-  })
-})

frontend/src/pages/theatres/TheatreDetailPage.tsx

@@ -1,271 +1,65 @@
-import { motion } from 'framer-motion'
-import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
 
 import ErrorScreen from '@/components/ErrorScreen'
-import PostEditForm from '@/components/PostEditForm'
 import PostEmbed from '@/components/PostEmbed'
 import PrefetchLink from '@/components/PrefetchLink'
-import TagLink from '@/components/TagLink'
+import TagDetailSidebar from '@/components/TagDetailSidebar'
 import FieldError from '@/components/common/FieldError'
-import { useDialogue } from '@/components/dialogues/DialogueProvider'
-import { Button } from '@/components/ui/button'
+import MainArea from '@/components/layout/MainArea'
+import SidebarComponent from '@/components/layout/SidebarComponent'
 import { SITE_TITLE } from '@/config'
-import { CATEGORIES, CATEGORY_NAMES } from '@/consts'
-import { apiDelete, apiGet, apiPatch, apiPost, apiPut, isApiError } from '@/lib/api'
+import { apiGet, apiPatch, apiPost, apiPut, isApiError } from '@/lib/api'
 import { fetchPost } from '@/lib/posts'
-import { canEditContent } from '@/lib/users'
-import { cn, dateString, inputClass } from '@/lib/utils'
+import { dateString, inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
-import type { FC, FormEvent, ReactNode } from 'react'
+import type { FC } from 'react'
 
-import type { NiconicoViewerHandle,
+import type { NiconicoMetadata,
+	      NiconicoViewerHandle,
 	      Post,
-	      Category,
-	      Tag,
 	      Theatre,
-	      TheatreComment,
-	      TheatreInfo,
-	      TheatrePostSelectionWeights,
-	      TheatreProgramme,
-	      User } from '@/types'
+	      TheatreComment } from '@/types'
+
+type TheatreInfo = {
+    hostFlg:        boolean
+    postId:         number | null
+    postStartedAt:  string | null
+    watchingUsers:  { id: number; name: string }[] }
 
 type TheatreCommentField = 'content'
-type TheatreLayoutMode = 'threeColumns' | 'tagsBottom' | 'commentsBottom'
-type TagFlow = 'vertical' | 'horizontal'
 
-const INITIAL_THEATRE_INFO: TheatreInfo =
+const INITIAL_THEATRE_INFO =
     { hostFlg: false,
       postId: null,
       postStartedAt: null,
-      postElapsedMs: null,
-      watchingUsers: [],
-      skipVote: { votesCount: 0,
-		  requiredCount: 1,
-		  watchingUsersCount: 0,
-		  voted: false } }
-
-const INITIAL_WEIGHTS: TheatrePostSelectionWeights =
-    { tagPenalties: [], lightestPosts: [], heaviestPosts: [] }
-
-const LAYOUT_STORAGE_KEY = 'theatre-layout-mode'
-const TAG_FLOW_STORAGE_KEY = 'theatre-tag-flow'
-
-const LAYOUT_LABELS: Record<TheatreLayoutMode, string> = {
-    threeColumns:   '3 列',
-    tagsBottom:     '2 列 A 型',
-    commentsBottom: '2 列 B 型' }
-
-const TAG_FLOW_LABELS: Record<TagFlow, string> = {
-    vertical:   '縦並び',
-    horizontal: '横並び' }
+      watchingUsers: [] as { id: number; name: string }[] } as const
 
 
-const userName = (user: Pick<User, 'id' | 'name'> | null | undefined): string =>
-    user ? (user.name || `名もなきニジラー（#${ user.id }）`) : '運営'
-
-
-const commentBox = (
-    comment: TheatreComment,
-    programme: TheatreProgramme | null = null,
-): ReactNode[] =>
-    [(
-	<div key={`${ comment.no }-content`} className="w-full">
-	  {comment.deleted
-	   ? <span className="text-sm font-bold">削除されました．</span>
-	   : comment.content}
-	</div>),
-     (
-	<div key={`${ comment.no }-user`} className="w-full text-sm text-right">
-	  by {userName (comment.user)}
-	</div>),
-     (
-	<div key={`${ comment.no }-createdAt`} className="w-full text-sm text-right">
-	  {dateString (comment.createdAt)}
-	</div>),
-     (
-	<div
-	    key={`${ comment.no }-post`}
-	    className="mt-1 w-full text-xs text-zinc-500 dark:text-zinc-400">
-	  {programme && (
-	      <>
-		<PrefetchLink to={`/posts/${ programme.post.id }`} className="font-bold hover:underline">
-		  {programme.post.title || programme.post.url}
-		</PrefetchLink>
-		&thinsp;へのコメント
-	      </>)}
-	</div>)]
-
-
-const compareTagName = (a: Tag, b: Tag): number =>
-    a.name === b.name ? 0 : (a.name < b.name ? -1 : 1)
-
-
-const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
-  const grouped: Partial<Record<Category, Tag[]>> = { }
-
-  for (const tag of tags)
-    {
-      grouped[tag.category] ??= []
-      grouped[tag.category]!.push (tag)
-    }
-
-  for (const cat of CATEGORIES)
-    grouped[cat]?.sort (compareTagName)
-
-  return grouped
-}
-
-
-const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
-    { tags, compact, flow = 'vertical' },
-) => {
-  const grouped = tagsByCategory (tags)
-
-  if (flow === 'horizontal')
-    {
-      return (
-	  <ul className={cn ('flex flex-wrap gap-x-3 gap-y-1', compact && 'text-sm')}>
-	    {CATEGORIES.flatMap (cat => grouped[cat] ?? []).map (tag => (
-		<li key={tag.id} className="text-left leading-tight">
-		  <TagLink tag={tag} withCount={false}/>
-		</li>))}
-	  </ul>)
-    }
-
-  return (
-      <div className="space-y-3">
-	{CATEGORIES.map (cat => {
-	  const rows = grouped[cat] ?? []
-	  if (rows.length === 0)
-	    return null
-
-	  return (
-	      <div key={cat}>
-		<div className="mb-1 shrink-0 text-xs font-bold text-zinc-500 dark:text-zinc-400">
-		  {CATEGORY_NAMES[cat]}
-		</div>
-		<ul className={cn ('space-y-1', compact && 'text-sm')}>
-		  {rows.map (tag => (
-		      <li key={tag.id} className="text-left leading-tight">
-			<TagLink tag={tag} withCount={false}/>
-		      </li>))}
-		</ul>
-	      </div>)
-	})}
-      </div>)
-}
-
-
-type Props = { user: User | null }
-
-
-const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
+const TheatreDetailPage: FC = () => {
   const { id } = useParams ()
-  const dialogue = useDialogue ()
 
   const commentsRef = useRef<HTMLDivElement> (null)
   const embedRef = useRef<NiconicoViewerHandle> (null)
   const loadingRef = useRef (false)
   const theatreInfoRef = useRef<TheatreInfo> (INITIAL_THEATRE_INFO)
-  const theatreInfoReceivedAtRef = useRef (performance.now ())
   const videoLengthRef = useRef (0)
   const lastCommentNoRef = useRef (0)
 
   const [comments, setComments] = useState<TheatreComment[]> ([])
   const [content, setContent] = useState ('')
-  const [editingPost, setEditingPost] = useState<Post | null> (null)
   const [loading, setLoading] = useState (false)
-  const [programmes, setProgrammes] = useState<TheatreProgramme[]> ([])
   const [sending, setSending] = useState (false)
   const [status, setStatus] = useState (200)
   const [theatre, setTheatre] = useState<Theatre | null> (null)
   const [theatreInfo, setTheatreInfo] = useState<TheatreInfo> (INITIAL_THEATRE_INFO)
   const [post, setPost] = useState<Post | null> (null)
   const [videoLength, setVideoLength] = useState (0)
-  const [weights, setWeights] = useState<TheatrePostSelectionWeights> (INITIAL_WEIGHTS)
-  const [layoutMode, setLayoutMode] = useState<TheatreLayoutMode> (() => {
-    const stored = localStorage.getItem (LAYOUT_STORAGE_KEY)
-    return (
-	((['threeColumns', 'tagsBottom', 'commentsBottom'] as TheatreLayoutMode[])
-	 .includes (stored as TheatreLayoutMode))
-	? (stored as TheatreLayoutMode)
-	: 'threeColumns')
-  })
-  const [tagFlow, setTagFlow] = useState<TagFlow> (() => {
-    const stored = localStorage.getItem (TAG_FLOW_STORAGE_KEY)
-    return (
-	(['vertical', 'horizontal'] as TagFlow[]).includes (stored as TagFlow)
-	? (stored as TagFlow)
-	: 'vertical')
-  })
   const { fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<TheatreCommentField> ()
 
-  const changeLayoutMode = (mode: TheatreLayoutMode) => {
-    setLayoutMode (mode)
-    localStorage.setItem (LAYOUT_STORAGE_KEY, mode)
-  }
-
-  const changeTagFlow = (flow: TagFlow) => {
-    setTagFlow (flow)
-    localStorage.setItem (TAG_FLOW_STORAGE_KEY, flow)
-  }
-
-  const applyTheatreInfo = useCallback ((nextInfo: TheatreInfo) => {
-    theatreInfoReceivedAtRef.current = performance.now ()
-    setTheatreInfo (nextInfo)
-  }, [])
-
-  const currentPostElapsedMs = useCallback (
-      (info: TheatreInfo = theatreInfoRef.current): number => {
-	if (info.postElapsedMs == null)
-	  return 0
-
-	return Math.max (
-	    info.postElapsedMs + performance.now () - theatreInfoReceivedAtRef.current,
-	    0)
-      }, [])
-
-  const refreshProgrammes = useCallback (async () => {
-    if (!(id))
-      return
-
-    setProgrammes (await apiGet<TheatreProgramme[]> (
-	`/theatres/${ id }/programmes`, { params: { limit: '100' } }))
-  }, [id])
-
-  const refreshWeights = useCallback (async () => {
-    if (!(id))
-      return
-
-    setWeights (await apiGet<TheatrePostSelectionWeights> (
-	`/theatres/${ id }/post_selection_weights`))
-  }, [id])
-
-  const advancePost = useCallback (async () => {
-    if (!(id))
-      return
-
-    setLoading (true)
-    try
-    {
-      await apiPatch<void> (`/theatres/${ id }/next_post`)
-      await refreshProgrammes ()
-      await refreshWeights ()
-    }
-    catch (error)
-    {
-      console.error (error)
-    }
-    finally
-    {
-      setLoading (false)
-    }
-  }, [id, refreshProgrammes, refreshWeights])
-
   useEffect (() => {
     loadingRef.current = loading
   }, [loading])
@@ -289,14 +83,10 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
     let cancelled = false
 
     setComments ([])
-    setEditingPost (null)
-    setPost (null)
-    setProgrammes ([])
     setTheatre (null)
-    theatreInfoReceivedAtRef.current = performance.now ()
+    setPost (null)
     setTheatreInfo (INITIAL_THEATRE_INFO)
     setVideoLength (0)
-    setWeights (INITIAL_WEIGHTS)
     lastCommentNoRef.current = 0
 
     void (async () => {
@@ -312,13 +102,10 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
       }
     }) ()
 
-    void refreshProgrammes ()
-    void refreshWeights ()
-
     return () => {
       cancelled = true
     }
-  }, [id, refreshProgrammes, refreshWeights])
+  }, [id])
 
   useEffect (() => {
     if (!(id))
@@ -337,11 +124,11 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
       {
 	const newComments = await apiGet<TheatreComment[]> (
 	    `/theatres/${ id }/comments`,
-	    { params: { no_gt: lastCommentNoRef.current, limit: '20' } })
+	    { params: { no_gt: lastCommentNoRef.current } })
 
 	if (!(cancelled) && newComments.length > 0)
 	  {
-	    lastCommentNoRef.current = newComments[0].no
+	    lastCommentNoRef.current = newComments[newComments.length - 1].no
 	    setComments (prev => [...newComments, ...prev])
 	  }
 
@@ -349,26 +136,20 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
 	const ended =
 	    currentInfo.hostFlg
 	    && currentInfo.postStartedAt
-	    && videoLengthRef.current > 0
-	    && currentPostElapsedMs (currentInfo) > videoLengthRef.current + 3_000
+	    && ((Date.now () - (new Date (currentInfo.postStartedAt)).getTime ())
+	        > videoLengthRef.current + 3_000)
 
 	if (ended)
 	  {
 	    if (!(cancelled))
-	      {
-		setTheatreInfo (prev => ({
-		    ...prev,
-		    postId: null,
-		    postStartedAt: null,
-		    postElapsedMs: null }))
-	      }
+	      setTheatreInfo (prev => ({ ...prev, postId: null, postStartedAt: null }))
 
 	    return
 	  }
 
 	const nextInfo = await apiPut<TheatreInfo> (`/theatres/${ id }/watching`)
 	if (!(cancelled))
-	  applyTheatreInfo (nextInfo)
+	  setTheatreInfo (nextInfo)
       }
       catch (error)
       {
@@ -387,7 +168,7 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
       cancelled = true
       clearInterval (interval)
     }
-  }, [applyTheatreInfo, currentPostElapsedMs, id])
+  }, [id])
 
   useEffect (() => {
     if (!(id) || !(theatreInfo.hostFlg) || loadingRef.current || theatreInfo.postId != null)
@@ -396,24 +177,33 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
     let cancelled = false
 
     void (async () => {
-      await advancePost ()
-      if (cancelled)
+      setLoading (true)
+
+      try
+      {
+	await apiPatch<void> (`/theatres/${ id }/next_post`)
+      }
+      catch (error)
+      {
+	console.error (error)
+      }
+      finally
+      {
+	if (!(cancelled))
 	  setLoading (false)
+      }
     }) ()
 
     return () => {
       cancelled = true
     }
-  }, [advancePost, id, theatreInfo.hostFlg, theatreInfo.postId])
+  }, [id, theatreInfo.hostFlg, theatreInfo.postId])
 
   useEffect (() => {
     setVideoLength (0)
 
     if (theatreInfo.postId == null)
-      {
-	setPost (null)
       return
-      }
 
     let cancelled = false
 
@@ -435,118 +225,63 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
     }
   }, [theatreInfo.postId])
 
-  useEffect (() => {
-    void refreshProgrammes ()
-  }, [refreshProgrammes, theatreInfo.postId])
-
-  const syncPlaybackTime = (currentTimeMs: number): number | void => {
+  const syncPlayback = (meta: NiconicoMetadata) => {
     if (!(theatreInfo.postStartedAt))
       return
 
-    const currentVideoLength = videoLengthRef.current
-    if (currentVideoLength <= 0)
-      return
-
     const targetTime = Math.min (
-	currentPostElapsedMs (theatreInfo),
-	currentVideoLength)
+	Math.max (0, Date.now () - (new Date (theatreInfo.postStartedAt)).getTime ()),
+	videoLength)
 
-    const drift = Math.abs (currentTimeMs - targetTime)
+    const drift = Math.abs (meta.currentTime - targetTime)
 
     if (drift > 5_000)
       embedRef.current?.seek (targetTime)
-
-    return targetTime
   }
 
-  const handlePlaybackError = async () => {
-    if (!(theatreInfoRef.current.hostFlg) || loadingRef.current)
-      return
+  if (status >= 400)
+    return <ErrorScreen status={status}/>
 
-    loadingRef.current = true
-    try
-    {
-      await advancePost ()
-    }
-    finally
-    {
-      loadingRef.current = false
-    }
-  }
+  return (
+      <div className="md:flex md:flex-1 overflow-y-auto md:overflow-y-hidden">
+	<Helmet>
+	  {theatre && (
+	      <title>
+		{'上映会場'
+		 + (theatre.name ? `『${ theatre.name }』` : ` #${ theatre.id }`)
+		 + ` | ${ SITE_TITLE }`}
+	      </title>)}
+	</Helmet>
 
-  const handleVideoReady = (durationMs: number) => {
-    const playableDurationMs =
-	Number.isFinite (durationMs)
-	? durationMs
-	: 0
-
-    setVideoLength (playableDurationMs)
-    videoLengthRef.current = playableDurationMs
-
-    if (playableDurationMs <= 0)
-      {
-	void handlePlaybackError ()
-	return
-      }
+	<div className="hidden md:block">
+	  {post && <TagDetailSidebar post={post}/>}
+	</div>
 
+	<MainArea>
+	  {post ? (
+	      <>
+		<PostEmbed
+		    key={post.id}
+		    ref={embedRef}
+		    post={post}
+		    onLoadComplete={info => {
 		      embedRef.current?.play ()
-  }
+		      setVideoLength (info.lengthInSeconds * 1_000)
+		    }}
+		    onMetadataChange={syncPlayback}/>
+		<div className="m-2">
+		  <>再生中：</>
+		  <PrefetchLink to={`/posts/${ post.id }`} className="font-bold">
+		    {post.title || post.url}
+		  </PrefetchLink>
+		</div>
+	      </>) : 'Loading...'}
+	</MainArea>
 
-  const handleSkipVote = async () => {
-    if (!(id) || !(post))
-      return
-
-    setLoading (true)
-    try
-    {
-      const nextInfo =
-	  theatreInfo.skipVote.voted
-	  ? await apiDelete<TheatreInfo> (
-	      `/theatres/${ id }/skip_vote`, { params: { post_id: post.id } })
-	  : await apiPut<TheatreInfo> (
-	      `/theatres/${ id }/skip_vote`, { post_id: post.id })
-
-      applyTheatreInfo (nextInfo)
-
-      if (nextInfo.skipped)
-	{
-	  setPost (null)
-	  await refreshProgrammes ()
-	  await refreshWeights ()
-	}
-    }
-    catch (error)
-    {
-      if (isApiError (error) && error.response?.status === 409)
-	applyTheatreInfo (await apiPut<TheatreInfo> (`/theatres/${ id }/watching`))
-
-      console.error (error)
-    }
-    finally
-    {
-      setLoading (false)
-    }
-  }
-
-  const handleDelete = async (commentNo: number) => {
-    try
-    {
-      await apiDelete (`/theatres/${ id }/comments/${ commentNo }`)
-      setComments (prev => {
-	const rtn = [...prev]
-	const idx = rtn.findIndex (x => x.no === commentNo)
-	if (idx >= 0)
-	  rtn[idx] = { ...rtn[idx], deleted: true, content: null }
-	return rtn
-      })
-    }
-    catch
-    {
-      ;
-    }
-  }
-
-  const handleCommentSubmit = async (e: FormEvent) => {
+	<SidebarComponent>
+	  <form
+	      className="w-auto h-auto border border-black dark:border-white rounded mx-2"
+	      onSubmit={async e => {
 		e.preventDefault ()
 
 		if (!(content))
@@ -568,61 +303,7 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
 		{
 		  setSending (false)
 		}
-  }
-
-  const skipVote = theatreInfo.skipVote
-  const theatreTitle = theatre?.name ? `上映会場『${ theatre.name }』` : '上映会場'
-  const postTags = post?.tags ?? []
-  const programmesAsc = useMemo (
-      () => [...programmes].sort (
-	  (a, b) => Date.parse (a.createdAt) - Date.parse (b.createdAt)),
-      [programmes])
-
-  const programmeForComment = useCallback ((comment: TheatreComment): TheatreProgramme | null => {
-    const commentedAt = Date.parse (comment.createdAt)
-    let found: TheatreProgramme | null = null
-
-    for (const programme of programmesAsc)
-      {
-	const startedAt = Date.parse (programme.createdAt)
-	if (startedAt > commentedAt)
-	  break
-
-	found = programme
-      }
-
-    return found
-  }, [programmesAsc])
-
-  if (status >= 400)
-    return <ErrorScreen status={status}/>
-
-  const tagPanel = (
-      <section className="rounded border-zinc-300 p-4 dark:border-zinc-800">
-	<div className="mb-3 flex items-center justify-between gap-3">
-	  <h2 className="font-bold">タグ</h2>
-	  {layoutMode === 'tagsBottom' && (
-	      <div className="hidden gap-2 md:flex">
-		{(Object.keys (TAG_FLOW_LABELS) as TagFlow[]).map (flow => (
-		    <Button
-			key={flow}
-			type="button"
-			size="sm"
-			variant={tagFlow === flow ? 'default' : 'outline'}
-			onClick={() => changeTagFlow (flow)}>
-		      {TAG_FLOW_LABELS[flow]}
-		    </Button>))}
-	      </div>)}
-	</div>
-	{postTags.length === 0
-	 ? <div className="text-sm text-zinc-500">タグはありません。</div>
-	 : <TagList tags={postTags} flow={layoutMode === 'tagsBottom' ? tagFlow : 'vertical'}/>}
-      </section>)
-
-  const commentsPanel = (
-      <section className="rounded border-zinc-300 p-4 dark:border-zinc-800">
-	<h2 className="mb-3 font-bold">コメント</h2>
-	<form onSubmit={handleCommentSubmit}>
+	      }}>
 	    <input
 		className={inputClass ((fieldErrors.content ?? []).length > 0)}
 		type="text"
@@ -631,330 +312,49 @@ const TheatreDetailPage: FC<Props> = ({ user }: Props) => {
 		onChange={e => setContent (e.target.value)}
 		disabled={sending}/>
 	    <FieldError messages={fieldErrors.content}/>
-	</form>
 
 	    <div
 		ref={commentsRef}
-	    className="mt-3 max-h-[48vh] overflow-y-auto rounded border border-zinc-200
-		       dark:border-zinc-800">
-	  {comments.map (comment => {
-	    const commentProgramme = programmeForComment (comment)
-	    return (
-		<div
-		    key={comment.no}
-		    className="group relative border-t border-zinc-100 p-2 first:border-t-0
-			       hover:bg-zinc-50 dark:border-zinc-800 dark:hover:bg-zinc-800">
-		  {(user && comment.user?.id === user.id && !(comment.deleted)) && (
-		      <button
-			  type="button"
-			  className="absolute left-1 top-1 hidden rounded px-1 text-red-600
-				     hover:bg-red-100 group-hover:inline-block dark:text-red-300
-				     dark:hover:bg-red-950"
-			  aria-label="コメントを削除"
-			  onClick={async e => {
-			    e.stopPropagation ()
-
-			    if (!(await dialogue.confirm ({
-				title: 'このコメントを削除しますか?',
-				description: (
-				    <div className="my-3 w-120 rounded border border-black p-2
-						    dark:border-white">
-				      {commentBox (comment, commentProgramme)}
-				    </div>),
-				confirmText: '削除',
-				variant: 'danger' })))
-			      return
-
-			    await handleDelete (comment.no)
-			  }}>
-			&times;
-		      </button>)}
-		  {commentBox (comment, commentProgramme)}
-		</div>)
-	  })}
+		className="overflow-x-hidden overflow-y-scroll text-wrap w-full
+			   h-[32vh] md:h-[64vh] border rounded">
+	      {comments.map (comment => (
+		  <div key={comment.no} className="p-2">
+		    <div className="w-full">
+		      {comment.content}
+		    </div>
+		    <div className="w-full text-sm text-right">
+		      by {comment.user
+			  ? (comment.user.name || `名もなきニジラー（#${ comment.user.id }）`)
+			  : '運営'}
+		    </div>
+		    <div className="w-full text-sm text-right">
+		      {dateString (comment.createdAt)}
 		    </div>
-      </section>)
-
-  const participantsPanel = (
-      <section className="rounded border-zinc-300 p-4 dark:border-zinc-800">
-	<h2 className="mb-3 font-bold">参加者</h2>
-	<div className="space-y-1">
-	  {theatreInfo.watchingUsers.map (watchingUser => (
-	      <div key={watchingUser.id} className="flex justify-between gap-2 text-sm">
-		<span>{userName (watchingUser)}</span>
-		{watchingUser.id === user?.id && <span className="text-zinc-500">お前</span>}
 		  </div>))}
 	    </div>
-      </section>)
+	  </form>
 
-  const historyPanel = (
-      <section className="rounded border-zinc-300 p-4 dark:border-zinc-800">
-	<h2 className="mb-3 font-bold">再生履歴</h2>
-	<div className="rounded border border-zinc-300 dark:border-zinc-800 max-h-72
-			overflow-y-auto">
-	  {programmes.length === 0
-	   ? <div className="text-sm text-zinc-500">まだ履歴はありません。</div>
-	   : (
-	      programmes.map (programme => (
-		  <div
-		      key={`${ programme.theatreId }-${ programme.position }`}
-		      className="border-zinc-100 p-2 text-sm first:border-t-0
-				 dark:border-zinc-800">
-		    <PrefetchLink
-			to={`/posts/${ programme.post.id }`}
-			className="font-bold hover:underline">
-		      {programme.post.title || programme.post.url}
-		    </PrefetchLink>
-		    <div className="text-xs text-zinc-500">
-		      {dateString (programme.createdAt)}
-		    </div>
-		  </div>)))}
-	</div>
-      </section>)
-
-  const weightsPanel = (
-      <section className="rounded border-zinc-300 p-4 dark:border-zinc-800">
-	<div className="mb-3 flex items-center justify-between gap-3">
-	  <h2 className="font-bold">抽選重み</h2>
-	  <Button type="button" variant="outline" size="sm" onClick={() => void refreshWeights ()}>
-	    更新
-	  </Button>
+	  <div className="w-auto h-auto border border-black dark:border-white rounded mx-2 mt-4">
+	    <div className="p-2">
+		現在の同接数：{theatreInfo.watchingUsers.length}
 	    </div>
 
-	<div className="mx-4 grid gap-16 xl:grid-cols-3">
-	  <div>
-	    <h3 className="mb-2 text-sm font-bold">出にくいタグ</h3>
-	    <div className="space-y-1 text-sm">
-	      {weights.tagPenalties.length === 0
-	       ? <div className="text-zinc-500">まだ減点はありません。</div>
-	       : (
-		  weights.tagPenalties.slice (0, 12).map (row => (
-		      <div
-			  key={row.tag.id}
-			  className="grid grid-cols-[minmax(0,1fr)_auto] items-baseline gap-2
-				     text-left">
-			<div className="min-w-0 text-left">
-			  <TagLink tag={row.tag} withCount={false}/>
-			</div>
-			<span className="font-mono">{row.penalty}</span>
-		      </div>)))}
+	    <div className="overflow-x-hidden overflow-y-scroll text-wrap w-full h-32
+			    border rounded">
+	      <ul className="list-inside list-disc">
+		{theatreInfo.watchingUsers.map (user => (
+		    <li key={user.id} className="px-4 py-1 text-sm">
+		      {user.name || `名もなきニジラー（#${ user.id }）`}
+		    </li>))}
+	      </ul>
 	    </div>
 	  </div>
-
-	  <div>
-	    <h3 className="mb-2 text-sm font-bold">出にくい候補</h3>
-	    <WeightRows rows={weights.lightestPosts}/>
-	  </div>
-
-	  <div>
-	    <h3 className="mb-2 text-sm font-bold">出やすい候補</h3>
-	    <WeightRows rows={weights.heaviestPosts}/>
-	  </div>
-	</div>
-      </section>)
-
-  return (
-      <motion.div
-	  layout="position"
-	  transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-	  className="min-h-0 flex-1 overflow-y-auto bg-zinc-50 text-zinc-950
-		     md:overflow-hidden dark:bg-zinc-950 dark:text-zinc-50">
-	<Helmet>
-	  <meta name="robots" content="noindex"/>
-	  {theatre && <title>{`${ theatreTitle } | ${ SITE_TITLE }`}</title>}
-	</Helmet>
-
-	<div className={cn (
-	    'grid min-h-full gap-4 overflow-visible md:h-full md:overflow-hidden',
-	    (layoutMode === 'threeColumns'
-	     && ['md:grid-cols-[16rem_minmax(0,1fr)_22rem]',
-		 'xl:grid-cols-[18rem_minmax(0,1fr)_24rem]']),
-	    (layoutMode === 'tagsBottom'
-	     && 'md:grid-cols-[minmax(0,1fr)_22rem] xl:grid-cols-[minmax(0,1fr)_24rem]'),
-	    (layoutMode === 'commentsBottom'
-	     && 'md:grid-cols-[16rem_minmax(0,1fr)] xl:grid-cols-[18rem_minmax(0,1fr)]'))}>
-	  {layoutMode !== 'tagsBottom' && (
-	      <motion.aside
-		  layout="position"
-		  className="hidden min-w-0 space-y-4 md:order-none md:block md:overflow-y-auto
-			     md:[direction:rtl]">
-		<div className="md:[direction:ltr]">
-		  {tagPanel}
-		</div>
-	      </motion.aside>)}
-
-	  <motion.main
-	      layout="position"
-	      className={cn ('order-1 min-w-0 space-y-4 md:order-none md:overflow-y-auto',
-			     layoutMode === 'tagsBottom' && 'md:[direction:rtl]')}>
-	    <div className={cn ('space-y-4', layoutMode === 'tagsBottom' && 'md:[direction:ltr]')}>
-	      <section className="overflow-hidden rounded border-zinc-300
-				  dark:border-zinc-800">
-		<div className="flex flex-wrap items-center justify-between gap-3
-				border-zinc-200 px-4 py-3 dark:border-zinc-800">
-		  <div>
-		    <h1 className="text-lg font-bold">{theatreTitle}</h1>
-		    <p className="text-sm text-zinc-500 dark:text-zinc-400">
-		      同接 {theatreInfo.watchingUsers.length} 人
-		    </p>
-		  </div>
-
-		  <div className="flex flex-wrap gap-2">
-		    <div className="hidden flex-wrap gap-2 md:flex">
-		      {(Object.keys (LAYOUT_LABELS) as TheatreLayoutMode[]).map (mode => (
-			  <Button
-			      key={mode}
-			      type="button"
-			      size="sm"
-			      variant={layoutMode === mode ? 'default' : 'outline'}
-			      onClick={() => changeLayoutMode (mode)}>
-			    {LAYOUT_LABELS[mode]}
-			  </Button>))}
-		    </div>
-
-		    <Button
-			type="button"
-			size="sm"
-			variant={skipVote.voted ? 'secondary' : 'destructive'}
-			disabled={loading || !(post)}
-			onClick={handleSkipVote}>
-		      {skipVote.voted ? 'スキップ取消' : 'スキップ'}
-		      {` ${ skipVote.votesCount } / ${ skipVote.requiredCount }`}
-		    </Button>
-
-		  </div>
-		</div>
-
-		<div className="flex justify-center bg-black mx-4">
-		  {post ? (
-		      <PostEmbed
-			  key={post.id}
-			  ref={embedRef}
-			  post={post}
-			  onVideoReady={handleVideoReady}
-			  onPlaybackChange={syncPlaybackTime}
-			  onError={handlePlaybackError}/>) : (
-		      <div className="grid min-h-72 place-items-center text-zinc-400">
-			{loading ? '次の投稿を選んでゐます……' : '上映待機中'}
-		      </div>)}
-		</div>
-
-		<div className="flex flex-wrap items-center justify-between gap-3 px-4 py-3">
-		  <div className="min-w-0">
-		    <div className="text-xs font-bold text-zinc-500 dark:text-zinc-400">
-		      再生中
-		    </div>
-		    {post ? (
-			<PrefetchLink
-			    to={`/posts/${ post.id }`}
-			    className="font-bold hover:underline">
-			  {post.title || post.url}
-			</PrefetchLink>) : (
-			<span className="text-zinc-500">未選択</span>)}
-		  </div>
-
-		  {(post && canEditContent (user)) && (
-		      <Button
-			  type="button"
-			  size="sm"
-			  variant="outline"
-			  disabled={!(post)}
-			  onClick={() => post && setEditingPost (ep => ep ? null : post)}>
-			{editingPost ? '閉じる' : '編輯'}
-		      </Button>)}
-		</div>
-	      </section>
-
-	      {editingPost && (
-		  <section className="rounded border border-amber-300 bg-amber-50 mx-4 p-4
-				      dark:border-amber-800 dark:bg-amber-950/30">
-		    <div className="mb-3">
-		      <h2 className="font-bold">編輯中の投稿</h2>
-		      <p className="text-sm text-amber-900 dark:text-amber-100">
-			<PrefetchLink
-			    to={`/posts/${ editingPost.id }`}
-			    className="mx-1 font-bold underline">
-			  {editingPost.title || editingPost.url}
-			</PrefetchLink>
-			を編輯中……
-		      </p>
-		    </div>
-
-		    <PostEditForm
-			post={editingPost}
-			onSave={newPost => {
-			  setEditingPost (newPost)
-			  if (post?.id === newPost.id)
-			    setPost (newPost)
-			  void refreshWeights ()
-			}}/>
-		  </section>)}
+	</SidebarComponent>
 
 	<div className="md:hidden">
-		{commentsPanel}
+	  {post && <TagDetailSidebar post={post} sp/>}
 	</div>
-
-	      {layoutMode === 'commentsBottom' && (
-		  <div className="hidden md:block">
-		    {commentsPanel}
-		  </div>)}
-
-	      <div className="md:hidden">
-		{tagPanel}
-	      </div>
-
-	      {layoutMode === 'tagsBottom' && (
-		  <div className="hidden md:block">
-		    {tagPanel}
-		  </div>)}
-
-	      {historyPanel}
-	      {weightsPanel}
-
-	      <div className="md:hidden">
-		{participantsPanel}
-	      </div>
-
-	      {layoutMode === 'commentsBottom' && (
-		  <div className="hidden md:block">
-		    {participantsPanel}
-		  </div>)}
-	    </div>
-	  </motion.main>
-
-	  {layoutMode !== 'commentsBottom' && (
-	      <motion.aside
-		  layout="position"
-		  className="hidden min-w-0 space-y-4 md:order-none md:block md:overflow-y-auto">
-		{commentsPanel}
-		{participantsPanel}
-	      </motion.aside>)}
-	</div>
-      </motion.div>)
+      </div>)
 }
 
-
-const WeightRows: FC<{ rows: TheatrePostSelectionWeights['lightestPosts'] }> = ({ rows }) => (
-    <div className="space-y-2 text-sm">
-      {rows.length === 0
-       ? <div className="text-zinc-500">候補はありません。</div>
-       : (
-	  rows.slice (0, 8).map (row => (
-	      <div
-		  key={row.post.id}
-		  className="border-zinc-100 pt-2 first:border-t-0 first:pt-0
-			     dark:border-zinc-800">
-		<PrefetchLink
-		    to={`/posts/${ row.post.id }`}
-		    className="line-clamp-1 font-bold hover:underline">
-		  {row.post.title || row.post.url}
-		</PrefetchLink>
-		<div className="flex justify-between gap-2 text-xs text-zinc-500">
-		  <span>penalty {row.penalty}</span>
-		  <span>weight {row.weight.toFixed (3)}</span>
-		</div>
-	      </div>)))}
-    </div>)
-
-
 export default TheatreDetailPage

frontend/src/test/factories.ts

@@ -1,13 +1,4 @@
-import type { Material,
-	      Post,
-	      Tag,
-	      Theatre,
-	      TheatreComment,
-	      TheatreInfo,
-	      TheatrePostSelectionWeights,
-	      TheatreProgramme,
-	      User,
-	      WikiPage } from '@/types'
+import type { Material, Post, Tag, User, WikiPage } from '@/types'
 
 export const buildTag = (overrides: Partial<Tag> = {}): Tag => ({
   id:             1,
@@ -81,62 +72,3 @@ export const buildMaterial = (overrides: Partial<Material> = {}): Material => ({
   updatedByUser: { id: 2, name: 'updater' },
   ...overrides,
 })
-
-export const buildTheatre = (overrides: Partial<Theatre> = {}): Theatre => ({
-  id:            1,
-  name:          'テスト劇場',
-  opensAt:       '2026-01-02T03:04:05.000Z',
-  closesAt:      null,
-  createdByUser: { id: 1, name: 'creator' },
-  createdAt:     '2026-01-02T03:04:05.000Z',
-  updatedAt:     '2026-01-03T03:04:05.000Z',
-  ...overrides,
-})
-
-export const buildTheatreInfo = (
-    overrides: Partial<TheatreInfo> = {},
-): TheatreInfo => ({
-  hostFlg:       false,
-  postId:        null,
-  postStartedAt: null,
-  postElapsedMs: null,
-  watchingUsers: [],
-  skipVote:      {
-    votesCount:         0,
-    requiredCount:      1,
-    watchingUsersCount: 0,
-    voted:              false,
-  },
-  ...overrides,
-})
-
-export const buildTheatreComment = (
-    overrides: Partial<TheatreComment> = {},
-): TheatreComment => ({
-  theatreId: 1,
-  no:        1,
-  deleted:   false,
-  user:      { id: 1, name: 'tester' },
-  content:   'テストコメント',
-  createdAt: '2026-01-02T03:04:05.000Z',
-  ...overrides,
-} as TheatreComment)
-
-export const buildTheatreProgramme = (
-    overrides: Partial<TheatreProgramme> = {},
-): TheatreProgramme => ({
-  theatreId: 1,
-  position:  1,
-  post:      buildPost (),
-  createdAt: '2026-01-02T03:04:05.000Z',
-  ...overrides,
-})
-
-export const buildTheatrePostSelectionWeights = (
-    overrides: Partial<TheatrePostSelectionWeights> = {},
-): TheatrePostSelectionWeights => ({
-  tagPenalties:  [],
-  lightestPosts: [],
-  heaviestPosts: [],
-  ...overrides,
-})

frontend/src/types.ts

@@ -223,63 +223,12 @@ export type Theatre = {
     createdAt:      string
     updatedAt:      string }
 
-export type TheatreComment =
-    | { theatreId:  number
-	no:         number
-	deleted:    false
+export type TheatreComment = {
+    theatreId:  number,
+    no:         number,
     user:       { id: number, name: string } | null
     content:    string
     createdAt:  string }
-    | { theatreId:  number
-	no:         number
-	deleted:    true
-	user:       { id: number, name: string } | null
-	content:    null,
-	createdAt:  string }
-
-export type TheatreProgramme = {
-    theatreId:  number
-    position:   number
-    post:       Post
-    createdAt:  string }
-
-export type TheatreSkipVoteStatus = {
-    votesCount:          number
-    requiredCount:       number
-    watchingUsersCount:  number
-    voted:               boolean }
-
-export type TheatreInfo = {
-    hostFlg:        boolean
-    postId:         number | null
-    postStartedAt:  string | null
-    postElapsedMs:  number | null
-    watchingUsers:  Pick<User, 'id' | 'name'>[]
-    skipVote:       TheatreSkipVoteStatus
-    skipped?:       boolean }
-
-export type TheatreSkipEvent = {
-    id:                 number
-    theatreId:          number
-    post:               Post
-    tags:               Tag[]
-    programmePosition:  number | null
-    createdAt:          string }
-
-export type TheatrePostWeight = {
-    post:     Post
-    weight:   number
-    penalty:  number
-    tags:     Tag[] }
-
-export type TheatreTagPenalty = {
-    tag:      Tag
-    penalty:  number }
-
-export type TheatrePostSelectionWeights = {
-    tagPenalties:  TheatreTagPenalty[]
-    lightestPosts: TheatrePostWeight[]
-    heaviestPosts: TheatrePostWeight[] }
 
 export type User = {
     id:               number