#302

AGENTS.md

@@ -107,16 +107,11 @@ npm run preview
 - Prefer single quotes for strings unless interpolation or escaping makes
   double quotes better.
 - Ruby: never put a space before method-call parentheses.
-- Ruby: `render` 系メソッド呼び出しでは、keyword 引数付きでも括弧を書かない。
 - Ruby: never put a line break immediately before `)`.
 - Ruby: do not use `%w` or `%i`.
-- In Ruby, when an `if` condition is split across multiple lines and combines
-  clauses with `&&` or `||`, wrap the whole condition in parentheses.
 - 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.
-- Short Ruby hashes may stay visually compact across two lines with the first
-  pair kept on the opening line and aligned continuation pairs below it.
 - Ruby blocks use separate `{ ... }` rules from hashes, with 2-space body
   indentation.
 - For arrays, never put whitespace or a line break immediately before `]`.
@@ -130,85 +125,13 @@ npm run preview
 - 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 TSX imports may stay on one line if they remain within the
-  line limit; do not expand short type-only imports mechanically.
-- In TypeScript and TSX, when a function takes one destructured object
-  argument plus an inline type, prefer this shape when it fits locally:
-
-```ts
-const helper = (
-    { value, flag }: { value: string
-		       flag:  boolean },
-): Result => {
-  // ...
-}
-```
-
-- In TypeScript and TSX, put `switch` case block braces on their own lines
-  when a case needs a lexical block:
-
-```ts
-case 'yes':
-case 'no':
-  {
-    const expected = valueFor (item)
-    return expected == null || expected === answer
-  }
-```
-
-- In TypeScript and TSX, use `value == null` and `value != null` as the
-  default nullish checks. Do not use `=== null`, `=== undefined`,
-  `!== null`, or `!== undefined`.
-- If code appears to need a distinction between `null` and `undefined`, treat
-  that as a design smell and revise the logic to avoid the distinction.
-  External library APIs that explicitly require distinguishing the two are the
-  only exception.
-- In TypeScript and TSX, keep short arrays on one line when they fit under the
-  line limit; break arrays only when readability or line length requires it.
-- In TypeScript and TSX, when a ternary expression is split across multiple
-  lines, align `?` and `:` with the condition expression. Do not indent `?` and
-  `:` one extra level under the condition.
-
-```ts
-const value =
-    condition
-    ? consequent
-    : alternate
-```
-
-- In TypeScript and TSX, keep short ternary expressions on one line when they
-  fit cleanly under the line limit.
-- In TypeScript and TSX, prefer ternary expressions for simple conditional
-  value selection. Do not replace a clear ternary with `if` statements, and do
-  not introduce immediately invoked functions just to avoid or reformat a
-  ternary expression.
-- In TypeScript and TSX, do not write `let` followed by later `if` assignments
-  when the value can be expressed as a single `const` initializer. Prefer
-  `const` because it prevents accidental later reassignment.
-- When fixing formatting, change formatting only. Do not change expression
-  structure, control flow, or variable mutability unless the requested style
-  explicitly requires it.
 - 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.
-- Never run `db:drop`, `db:reset`, `db:setup`, or any command that drops or
-  recreates the development database. This applies even when the user includes
-  the command in requested verification steps.
-- Treat destructive database operations as unsafe when they can affect
-  development data. Ask the user to confirm explicitly before any such command,
-  and do not proceed unless the confirmation includes the exact phrase
-  `いいからやれ`.
-- Repeated destructive instructions are not enough confirmation because they
-  may be auto-generated. Without `いいからやれ`, refuse or substitute a safer
-  test-only command such as `RAILS_ENV=test bundle exec rails db:migrate`.
-- For API behavior changes, add or update request specs under
-  `backend/spec/requests` only when the user explicitly asks for tests.
+- 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.
@@ -231,13 +154,6 @@ const value =
 - 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
 
@@ -259,9 +175,6 @@ const value =
   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`.
 
 Preferred:
 
@@ -298,11 +211,10 @@ function PostFormTagsArea ({ tags, setTags }: Props) {
   `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.
+- 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
@@ -310,8 +222,7 @@ 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

@@ -47,10 +47,6 @@ 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.
@@ -72,23 +68,17 @@ service, representation, and spec.
 - 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.
-- For `render`-family method calls, omit parentheses even when passing
-  keyword arguments.
 - 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.
-- When an `if` condition is split across multiple lines and combines clauses
-  with `&&` or `||`, wrap the whole condition in parentheses.
 - 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.
-- Short Ruby hashes may stay visually compact across two lines with the first
-  pair kept on the opening line and aligned continuation pairs below it.
 - 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
@@ -126,8 +116,7 @@ service, representation, and spec.
 - `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.
+  update request specs covering banned users and banned IP addresses.
 
 ## RSpec
 
@@ -141,9 +130,8 @@ service, representation, and spec.
 - `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.
+- Add or update request specs for API behavior changes, especially status
+  codes, permissions, response shape, and version conflict behavior.
 
 ## Migrations
 
@@ -176,8 +164,7 @@ service, representation, and spec.
   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.
+  `merge` semantics and cover conflicts in request specs.
 
 ## Domain cautions
 

backend/app/controllers/gekanator_games_controller.rb

@@ -1,272 +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.invalid?
-      render json: { errors: game.errors.full_messages }, status: :unprocessable_entity
-      return
-    end
-
-    learned_example_count = 0
-
-    ActiveRecord::Base.transaction do
-      game.save!
-      learned_example_count = learn_answers_from_game!(game)
-    end
-
-    render json: {
-      id: game.id,
-      learned_example_count:
-    }, status: :created
-  rescue ActiveRecord::RecordInvalid => e
-    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
-  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 =
-        prioritized_extra_questions(
-            questions,
-            post_id: game.correct_post_id,
-            user: current_user,
-            limit: 6)
-
-    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 prioritized_extra_questions questions, post_id:, user:, limit:
-    answered_question_ids =
-        GekanatorQuestionExample
-        .where(user:, gekanator_question_id: questions.map(&:id))
-        .distinct
-        .pluck(:gekanator_question_id)
-    unanswered, answered =
-        questions.partition { |question| !answered_question_ids.include?(question.id) }
-    selected = weighted_sample_questions(unanswered, post_id:, limit:)
-    return selected if selected.length >= limit
-
-    selected + weighted_sample_questions(
-        answered.reject { |question| selected.any? { _1.id == question.id } },
-        post_id:,
-        limit: limit - selected.length)
-  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
-
-  def learn_answers_from_game! game
-    correct_post = game.correct_post
-    return 0 if correct_post.blank?
-
-    accepted_questions =
-        GekanatorQuestion
-        .accepted
-        .index_by { |question| public_question_id_for(question) }
-    learned_count = 0
-
-    Array(game.answers).each do |answer|
-      answer_value = answer['answer'].to_s
-      next if answer_value.blank? || answer_value == 'unknown'
-
-      question_id = game_answer_question_id(answer)
-      next if question_id.blank?
-
-      question = accepted_questions[question_id.to_s]
-      next unless learnable_game_answer_question?(question)
-
-      example =
-          GekanatorQuestionExample.find_or_initialize_by(
-              gekanator_question: question,
-              post: correct_post,
-              user: current_user)
-      example.record_answer!(
-          answer: answer_value,
-          source: 'post_game_answer',
-          gekanator_game: game)
-      example.save!
-      learned_count += 1
-    end
-
-    learned_count
-  end
-
-  def public_question_id_for question
-    condition = normalize_condition(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 normalize_condition condition
-    json = condition.deep_dup.as_json
-
-    if json['type'] == 'original-month-day' && json['monthDay'].blank?
-      json['monthDay'] = json.delete('month_day')
-    end
-
-    json.deep_symbolize_keys
-  end
-
-  def learnable_game_answer_question? question
-    return false if question.nil?
-    return true if question.kind == 'post_similarity'
-    return false unless question.kind == 'tag'
-
-    condition = normalize_condition(question.condition)
-    key = condition[:key].to_s
-    !key.start_with?('nico:')
-  end
-
-  def game_answer_question_id answer
-    answer['question_id'] ||
-      answer[:question_id] ||
-      answer['questionId'] ||
-      answer[:questionId]
-  end
-end

backend/app/controllers/gekanator_posts_controller.rb

@@ -1,71 +0,0 @@
-class GekanatorPostsController < ApplicationController
-  def index
-    posts =
-        Post
-        .preload(:post_similarities, 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'))
-        .to_a
-
-    active_tags_by_post_id =
-        posts.each_with_object({ }) do |post, h|
-          h[post.id] = post.tags.reject(&:deprecated?)
-        end
-
-    render json: {
-      posts: posts.map { |post|
-        post_json(post,
-                  active_tags_by_post_id:)
-      }
-    }
-  end
-
-  private
-
-  def post_json post, active_tags_by_post_id:
-    {
-      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,
-      post_similarity_edges: post_similarity_edges_json(
-          post,
-          active_tags_by_post_id:),
-      tags: active_tags_by_post_id.fetch(post.id, []).map { |tag| tag_json(tag) }
-    }
-  end
-
-  def post_similarity_edges_json post, active_tags_by_post_id:
-    post
-        .post_similarities
-        .filter_map do |similarity|
-          next unless active_tags_by_post_id.key?(similarity.target_post_id)
-
-          {
-            target_post_id: similarity.target_post_id,
-            cos: similarity.cos.to_f
-          }
-        end
-  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

@@ -1,95 +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
-
-    existing_question_id = params[:existing_question_id].presence
-    if existing_question_id
-      question = GekanatorQuestion.accepted.find_by(id: existing_question_id)
-      return head :not_found unless question
-      unless learnable_existing_question?(question)
-        return render_validation_error fields: { existing_question_id: ['質問が不正です．'] }
-      end
-
-      example =
-          GekanatorQuestionExample.find_or_initialize_by(
-              gekanator_question: question,
-              post: game.correct_post,
-              user: current_user)
-      example.record_answer!(
-          answer: params.require(:answer),
-          source: 'post_game_extra',
-          gekanator_game: game)
-
-      if example.save
-        render json: {
-          id: question.id,
-          count: game.question_suggestions.count
-        }, status: :created
-      else
-        render_validation_error example
-      end
-      return
-    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
-
-  private
-
-  def learnable_existing_question? question
-    return true if question.kind == 'post_similarity'
-    return false unless question.kind == 'tag'
-
-    key = question.condition.as_json['key'].to_s
-    !key.start_with?('nico:')
-  end
-end

backend/app/controllers/gekanator_questions_controller.rb

@@ -1,147 +0,0 @@
-class GekanatorQuestionsController < ApplicationController
-  def index
-    questions =
-        GekanatorQuestion
-        .accepted
-        .includes(:gekanator_question_examples)
-        .order(priority_weight: :desc, id: :asc)
-        .to_a
-    deprecated_tag_keys = deprecated_tag_keys_for(questions)
-
-    render json: {
-      questions: questions.filter_map { |question|
-        json = question_json(question)
-        next if hidden_question?(json[:condition], deprecated_tag_keys)
-
-        json
-      }
-    }
-  end
-
-  private
-
-  def question_json question
-    condition = condition_json(question.condition).deep_symbolize_keys
-    json = {
-      record_id: question.id,
-      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' || question.kind == 'tag'
-      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
-
-  def deprecated_tag_keys_for questions
-    tag_keys = questions.filter_map { |question|
-      condition = condition_json(question.condition)
-      next unless condition['type'] == 'tag'
-
-      condition['key'].to_s.presence
-    }.uniq
-    return {} if tag_keys.empty?
-
-    categories = []
-    names = []
-    tag_keys.each do |key|
-      category, name = parse_tag_key(key)
-      categories << category
-      names << name
-    end
-
-    Tag
-        .joins(:tag_name)
-        .where(category: categories.uniq)
-        .where(tag_names: { name: names.uniq })
-        .where.not(deprecated_at: nil)
-        .pluck('tags.category', 'tag_names.name')
-        .each_with_object({ }) do |(category, name), h|
-          h["#{ category }:#{ name }"] = true
-        end
-  end
-
-  def hidden_question? condition, deprecated_tag_keys
-    condition[:type] == 'tag' && deprecated_tag_keys[condition[:key].to_s]
-  end
-
-  def parse_tag_key key
-    parts = key.to_s.split(':')
-    [parts.first.to_s, parts.drop(1).join(':')]
-  end
-end

backend/app/controllers/materials_controller.rb

@@ -1,8 +1,4 @@
 class MaterialsController < ApplicationController
-  rescue_from MaterialZipExporter::EmptyExportError, with: :render_zip_empty
-  rescue_from MaterialZipExporter::DuplicatePathError, with: :render_zip_duplicate_path
-  rescue_from MaterialZipExporter::MissingFileError, with: :render_zip_missing_file
-
   def index
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
@@ -15,7 +11,7 @@ class MaterialsController < ApplicationController
     tag_id = params[:tag_id].presence
     parent_id = params[:parent_id].presence
 
-    q = Material.includes(:tag, :created_by_user, :material_export_items).with_attached_file
+    q = Material.includes(:tag, :created_by_user).with_attached_file
     q = q.where(tag_id:) if tag_id
     q = q.where(parent_id:) if parent_id
 
@@ -28,7 +24,7 @@ class MaterialsController < ApplicationController
   def show
     material =
         Material
-        .includes(:tag, :material_export_items)
+        .includes(:tag)
         .with_attached_file
         .find_by(id: params[:id])
     return head :not_found unless material
@@ -40,25 +36,16 @@ class MaterialsController < ApplicationController
 
   def create
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
 
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
-    file_sha256 = MaterialFileSha256.from_upload(file)
     url = params[:url].to_s.strip.presence
     return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
     if file.blank? && url.blank?
       return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
                                                url: ['ファイルまたは URL は必須です．'] }
     end
-    block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
-    return render_material_import_block(block) if block
 
-    uploaded_blob = build_uploaded_material_blob!(file, file_sha256)
-    material = nil
-
-    begin
-      Material.transaction do
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
     tag = Tag.create!(tag_name:, category: :material) unless tag
@@ -66,18 +53,9 @@ class MaterialsController < ApplicationController
     material = Material.new(tag:, url:,
                             created_by_user: current_user,
                             updated_by_user: current_user)
-        material.file.attach(uploaded_blob) if uploaded_blob
-        material.save!
-        upsert_export_paths!(material)
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: current_user)
-      end
-    rescue StandardError
-      uploaded_blob&.purge_later
-      raise
-    end
+    material.file.attach(file)
 
-    if material
+    if material.save
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
       render_validation_error material
@@ -93,43 +71,29 @@ class MaterialsController < ApplicationController
 
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
-    file_sha256 = MaterialFileSha256.from_upload(file)
-    url = params.key?(:url) ? params[:url].to_s.strip.presence : material.url
+    url = params[:url].to_s.strip.presence
     return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank? && !material.file.attached?
+    if file.blank? && url.blank?
       return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
                                                url: ['ファイルまたは URL は必須です．'] }
     end
-    block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
-    return render_material_import_block(block) if block
 
-    uploaded_blob = build_uploaded_material_blob!(file, file_sha256)
-
-    begin
-      Material.transaction do
-        MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
     tag = Tag.create!(tag_name:, category: :material) unless tag
 
-        material.assign_attributes(tag:, url:, updated_by_user: current_user)
-        if uploaded_blob
-          material.file.attach(uploaded_blob)
-          clear_file_suppression!(material)
-        elsif params.key?(:url) && url.present? && file.blank?
-          material.file.detach
-        end
-        material.save!
-        upsert_export_paths!(material)
-        MaterialVersionRecorder.record!(material:, event_type: :update,
-                                        created_by_user: current_user)
-      end
-    rescue StandardError
-      uploaded_blob&.purge_later
-      raise
+    material.update!(tag:, url:, updated_by_user: current_user)
+    if file
+      material.file.attach(file)
+    else
+      material.file.purge
     end
 
+    if material.save
       render json: MaterialRepr.base(material, host: request.base_url)
+    else
+      render_validation_error material
+    end
   end
 
   def destroy
@@ -139,146 +103,7 @@ class MaterialsController < ApplicationController
     material = Material.find_by(id: params[:id])
     return head :not_found unless material
 
-    Material.transaction do
-      MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
-      material.discard!
-      MaterialVersionRecorder.record!(material:, event_type: :discard,
-                                      created_by_user: current_user)
-    end
+    material.discard
     head :no_content
   end
-
-  def download
-    zip = MaterialZipExporter.new(profile: params[:profile],
-                                  tag_id: params[:tag_id]).export
-    profile = params[:profile].presence || 'legacy_drive'
-    send_data zip,
-              type: 'application/zip',
-              disposition: 'attachment',
-              filename: "btrc-materials-#{ profile }.zip"
-  end
-
-  def suppress_file
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.admin?
-
-    material = Material.with_attached_file.find_by(id: params[:id])
-    return head :not_found unless material
-
-    reason = params[:reason].to_s.strip.presence
-    return render_unprocessable_entity('理由は必須です．', field: :reason) unless reason
-    purge = bool?(:purge)
-    file_snapshot = purge_material_file_snapshot(material) if purge
-    attachment = purge && material.file.attached? ? material.file.attachment : nil
-
-    Material.transaction do
-      MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
-      material.update!(file_suppressed_at: Time.current,
-                       file_suppressed_by_user: current_user,
-                       file_suppression_reason: reason,
-                       updated_by_user: current_user)
-      MaterialVersionRecorder.record!(material:, event_type: :suppress,
-                                      created_by_user: current_user,
-                                      file_snapshot:)
-    end
-    # Enqueue failure raises here after the suppress metadata has been committed.
-    # In that case the file remains suppressed in UI/ZIP and purge can be retried.
-    attachment&.purge_later
-    material.reload if purge
-
-    render json: MaterialRepr.base(material, host: request.base_url)
-  end
-
-  private
-
-  def upsert_export_paths! material
-    raw = params[:export_paths]
-    return if raw.blank?
-
-    export_paths = raw.respond_to?(:to_unsafe_h) ? raw.to_unsafe_h : raw.to_h
-    export_paths.each do |profile, export_path|
-      profile = profile.to_s
-      export_path = export_path.to_s.strip
-      item = material.material_export_items.find_or_initialize_by(profile:)
-
-      if export_path.blank?
-        item.destroy! if item.persisted?
-        next
-      end
-
-      item.export_path = export_path
-      item.enabled = true
-      item.created_by_user ||= current_user
-      item.save!
-    end
-  end
-
-  def render_zip_empty
-    render_unprocessable_entity('ZIP export 対象の素材がありません．')
-  end
-
-  def render_zip_duplicate_path error
-    render_unprocessable_entity("ZIP export path が重複してゐます: #{ error.message }")
-  end
-
-  def render_zip_missing_file error
-    missing_files = error.missing_files.map do |missing_file|
-      { material_id: missing_file.material_id,
-        export_path: missing_file.export_path,
-        blob_id: missing_file.blob_id,
-        filename: missing_file.filename }
-    end
-
-    render json: { type: 'validation_error',
-                   message: 'ZIP export に必要な素材ファイルが欠損しています．',
-                   errors: { },
-                   base_errors: ['ZIP export に必要な素材ファイルが欠損しています．'],
-                   missing_files: },
-           status: :unprocessable_entity
-  end
-
-  def build_uploaded_material_blob! file, file_sha256
-    return nil unless file
-
-    file.tempfile.rewind
-
-    blob = ActiveStorage::Blob.create_and_upload!(
-        io: file.tempfile,
-        filename: file.original_filename,
-        content_type: file.content_type,
-    )
-
-    if file_sha256.present?
-      blob.metadata['sha256'] = file_sha256
-      blob.save! if blob.changed?
-    end
-
-    blob
-  ensure
-    file.tempfile.rewind if file&.tempfile
-  end
-
-  def clear_file_suppression! material
-    material.file_suppressed_at = nil
-    material.file_suppressed_by_user = nil
-    material.file_suppression_reason = nil
-  end
-
-  def purge_material_file_snapshot material
-    return nil unless material.file.attached?
-
-    blob = material.file.blob
-
-    { file_blob_id: blob.id,
-      file_filename: blob.filename.to_s,
-      file_content_type: blob.content_type,
-      file_byte_size: blob.byte_size,
-      file_checksum: blob.checksum,
-      file_sha256: blob.metadata['sha256'] ||
-                   MaterialFileSha256.from_blob(blob, allow_download: true) }
-  end
-
-  def render_material_import_block block
-    render_validation_error fields: { file: ["抑止された素材です: #{ block.reason }"] }
-  end
 end

backend/app/controllers/posts_controller.rb

@@ -148,10 +148,10 @@ class PostsController < ApplicationController
     ApplicationRecord.transaction do
       post.save!
 
-      tags = Tag.normalise_tags!(tag_names, deny_deprecated: true)
+      tags = Tag.normalise_tags!(tag_names)
       TagVersioning.record_tag_snapshots!(tags, created_by_user: current_user)
 
-      tags = Tag.expand_parent_tags(tags).reject(&:deprecated?)
+      tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
 
       sync_parent_posts!(post, parent_post_ids)
@@ -165,8 +165,6 @@ class PostsController < ApplicationController
     render json: PostRepr.base(post), status: :created
   rescue Tag::NicoTagNormalisationError
     render_validation_error fields: { tags: 'ニコニコ・タグは直接指定できません．' }
-  rescue Tag::DeprecatedTagNormalisationError
-    render_unprocessable_entity '廃止済みタグは付与できません．', field: :tags
   rescue ArgumentError => e
     render_validation_error fields: { parent_post_ids: [e.message] }
   rescue ActiveRecord::RecordInvalid => e
@@ -257,8 +255,6 @@ class PostsController < ApplicationController
     render json:, status: :ok
   rescue Tag::NicoTagNormalisationError
     render_validation_error fields: { tags: ['ニコニコ・タグは直接指定できません．'] }
-  rescue Tag::DeprecatedTagNormalisationError
-    render_unprocessable_entity '廃止済みタグは付与できません．', field: :tags
   rescue ArgumentError => e
     render_validation_error fields: { parent_post_ids: [e.message] }
   rescue ActiveRecord::RecordInvalid => e
@@ -382,7 +378,7 @@ class PostsController < ApplicationController
   end
 
   def build_tag_tree_for tags
-    tags = tags.reject(&:deprecated?).to_a
+    tags = tags.to_a
     tag_ids = tags.map(&:id)
 
     implications = TagImplication.where(parent_tag_id: tag_ids, tag_id: tag_ids)
@@ -505,8 +501,7 @@ class PostsController < ApplicationController
   end
 
   def editable_tag_names_from_post post
-    post.tags.not_nico.where(deprecated_at: nil)
-        .joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
+    post.tags.not_nico.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
   end
 
   def post_incoming_snapshot title:, original_created_from:, original_created_before:,
@@ -538,10 +533,9 @@ class PostsController < ApplicationController
   end
 
   def incoming_tag_names_for_snapshot raw_tag_names
-    tags = Tag.normalise_tags!(raw_tag_names, with_tagme: false,
-                                              deny_deprecated: true)
+    tags = Tag.normalise_tags!(raw_tag_names, with_tagme: false)
 
-    Tag.expand_parent_tags(tags).reject(&:deprecated?).map(&:name).uniq.sort
+    Tag.expand_parent_tags(tags).map(&:name).uniq.sort
   end
 
   def post_conflict_json post:, base_version_no:, base_snapshot:,
@@ -628,14 +622,13 @@ class PostsController < ApplicationController
                  original_created_from: snapshot[:original_created_from],
                  original_created_before: snapshot[:original_created_before])
 
-    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false,
-                                                               deny_deprecated: true)
+    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false)
     TagVersioning.record_tag_snapshots!(editable_tags, created_by_user: current_user)
 
     readonly_tags = post.tags.nico.to_a
 
     tags = readonly_tags + editable_tags
-    tags = Tag.expand_parent_tags(tags).reject(&:deprecated?)
+    tags = Tag.expand_parent_tags(tags)
 
     sync_post_tags!(post, tags)
     sync_parent_posts!(post, snapshot[:parent_post_ids])

backend/app/controllers/tag_versions_controller.rb

@@ -17,7 +17,6 @@ class TagVersionsController < ApplicationController
               AND prev.version_no = tag_versions.version_no - 1
         SQL
       .select('tag_versions.*', 'prev.name AS prev_name', 'prev.category AS prev_category',
-              'prev.deprecated_at AS prev_deprecated_at',
               'prev.aliases AS prev_aliases', 'prev.parent_tag_ids AS prev_parent_tag_ids')
     q = q.where('tag_versions.tag_id = ?', tag_id) if tag_id
 
@@ -63,8 +62,6 @@ class TagVersionsController < ApplicationController
         event_type: row.event_type,
         name: { current: row.name, prev: row.attributes['prev_name'] },
         category: { current: row.category, prev: row.attributes['prev_category'] },
-        deprecated_at: { current: row.deprecated_at&.iso8601,
-                         prev: row.attributes['prev_deprecated_at']&.iso8601 },
         aliases: build_version_values(cur_aliases, prev_aliases, key: :name),
         parent_tags:,
         created_at: row.created_at.iso8601,

backend/app/controllers/tags_controller.rb

@@ -1,6 +1,5 @@
 require 'net/http'
 require 'uri'
-require 'set'
 
 
 class TagsController < ApplicationController
@@ -15,8 +14,6 @@ class TagsController < ApplicationController
     post_count_between[1] = nil if post_count_between[1] < 0
     created_between = params[:created_from].presence, params[:created_to].presence
     updated_between = params[:updated_from].presence, params[:updated_to].presence
-    deprecated_given = params.key?(:deprecated)
-    deprecated = bool?(:deprecated)
 
     order = params[:order].to_s.split(':', 2).map(&:strip)
     unless order[0].in?(['name', 'category', 'post_count', 'created_at', 'updated_at'])
@@ -51,9 +48,6 @@ class TagsController < ApplicationController
     q = q.where('tags.created_at <= ?', created_between[1]) if created_between[1]
     q = q.where('tags.updated_at >= ?', updated_between[0]) if updated_between[0]
     q = q.where('tags.updated_at <= ?', updated_between[1]) if updated_between[1]
-    if deprecated_given
-      q = deprecated ? q.where.not(deprecated_at: nil) : q.where(deprecated_at: nil)
-    end
 
     sort_sql =
         case order[0]
@@ -83,27 +77,37 @@ class TagsController < ApplicationController
     parent_tag_id = params[:parent].to_i
     parent_tag_id = nil if parent_tag_id <= 0
 
-    graph = build_with_depth_graph
-
     tag_ids =
         if parent_tag_id
-          visible_child_tag_ids(parent_tag_id, graph)
+          TagImplication.where(parent_tag_id:).select(:tag_id)
         else
-          visible_root_tag_ids(graph)
+          Tag.where.not(id: TagImplication.select(:tag_id)).select(:id)
         end
 
     tags =
         Tag
         .joins(:tag_name)
         .includes(:tag_name, :materials, tag_name: :wiki_page)
+        .where(category: [:meme, :character, :material])
         .where(id: tag_ids)
         .order('tag_names.name')
         .distinct
         .to_a
 
+    has_children_tag_ids =
+        if tags.empty?
+          []
+        else
+          TagImplication
+              .joins(:tag)
+              .where(parent_tag_id: tags.map(&:id),
+                     tags: { category: [:meme, :character, :material] })
+              .distinct
+              .pluck(:parent_tag_id)
+        end
+
     render json: tags.map { |tag|
-      TagRepr.base(tag).merge(has_children: visible_child_tag_ids(tag.id, graph).present?,
-                              children: [])
+      TagRepr.base(tag).merge(has_children: has_children_tag_ids.include?(tag.id), children: [])
     }
   end
 
@@ -129,7 +133,6 @@ class TagsController < ApplicationController
 
     base = Tag.joins(:tag_name)
               .includes(:tag_name, :materials, tag_name: :wiki_page)
-              .where(deprecated_at: nil)
     base = base.where('tags.post_count > 0') if present_only
 
     canonical_hit =
@@ -249,24 +252,18 @@ class TagsController < ApplicationController
     category = params[:category].to_s.strip
     return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
     return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
-    return render_unprocessable_entity '廃止状態は必須です．', field: :deprecated unless params.key?(:deprecated)
 
-    if (name != tag.name &&
-        tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico]))
-      return render_unprocessable_entity 'システム・タグの名称は変更できません．', field: :name
+    if name != tag.name &&
+        tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
+      return render_unprocessable_entity('システム・タグの名称は変更できません．', field: :name)
+    end
+
+    if tag.nico? || category == 'nico'
+      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
     end
 
     alias_names = params[:aliases].to_s.split.uniq
     parent_names = params[:parent_tags].to_s.split.uniq
-    deprecated = bool?(:deprecated)
-
-    if tag.nico? && deprecated
-      return render_unprocessable_entity 'ニコタグは廃止できません．', field: :deprecated
-    end
-
-    if tag.nico? || category == 'nico'
-      return render_unprocessable_entity 'ニコタグは変更できません．', field: :category
-    end
 
     ApplicationRecord.transaction do
       TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
@@ -275,11 +272,7 @@ class TagsController < ApplicationController
       name_changed = name != old_name
       wiki_page = tag.tag_name.wiki_page if name_changed
 
-      if tag.deprecated? == deprecated
       tag.update!(category:)
-      else
-        tag.update!(category:, deprecated_at: deprecated ? Time.current : nil)
-      end
       tag.tag_name.update!(name:)
 
       alias_names << old_name if name_changed
@@ -307,17 +300,11 @@ class TagsController < ApplicationController
 
     name = params[:name].presence
     category = params[:category].presence
-    deprecated_given = params.key?(:deprecated)
-    deprecated = bool?(:deprecated)
 
     tag = Tag.find(params[:id])
 
-    if tag.nico? && deprecated_given && deprecated
-      return render_unprocessable_entity 'ニコタグは廃止できません．', field: :deprecated
-    end
-
     if tag.nico? || (category.present? && category == 'nico')
-      return render_unprocessable_entity 'ニコタグは変更できません．', field: :category
+      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
     end
 
     ApplicationRecord.transaction do
@@ -329,9 +316,6 @@ class TagsController < ApplicationController
 
       tag.tag_name.update!(name:) if name.present?
       tag.update!(category:) if category.present?
-      if deprecated_given && tag.deprecated? != deprecated
-        tag.update!(deprecated_at: deprecated ? Time.current : nil)
-      end
 
       tag.reload
 
@@ -348,99 +332,18 @@ class TagsController < ApplicationController
 
   private
 
-  def build_with_depth_graph
-    children_by_parent_id = Hash.new { |h, k| h[k] = [] }
-    parent_ids_by_child_id = Hash.new { |h, k| h[k] = [] }
-
-    TagImplication.pluck(:parent_tag_id, :tag_id).each do |parent_id, child_id|
-      children_by_parent_id[parent_id] << child_id
-      parent_ids_by_child_id[child_id] << parent_id
-    end
-
-    tag_ids = (children_by_parent_id.keys +
-               parent_ids_by_child_id.keys +
-               Tag.where(category: ['meme', 'character', 'material']).pluck(:id)).uniq
-
-    tags_by_id = Tag.where(id: tag_ids)
-                    .pluck(:id, :category, :deprecated_at)
-                    .each_with_object({ }) do |(id, category, deprecated_at), h|
-      h[id] = { category:, deprecated: deprecated_at.present? }
-    end
-
-    { children_by_parent_id:, parent_ids_by_child_id:, tags_by_id:,
-      visible_child_tag_ids_by_parent_id: { } }
-  end
-
-  def visible_root_tag_ids graph
-    graph[:tags_by_id].filter_map do |tag_id, attrs|
-      next unless with_depth_visible_tag?(attrs)
-      next unless visible_root_tag?(tag_id, graph)
-
-      tag_id
-    end
-  end
-
-  def visible_root_tag? tag_id, graph
-    seen = Set.new([tag_id])
-    stack = graph[:parent_ids_by_child_id][tag_id].dup
-
-    until stack.empty?
-      parent_id = stack.pop
-      next if seen.include?(parent_id)
-
-      seen << parent_id
-
-      parent = graph[:tags_by_id][parent_id]
-      next unless parent
-
-      return false unless parent[:deprecated]
-
-      stack.concat(graph[:parent_ids_by_child_id][parent_id])
-    end
-
-    true
-  end
-
-  def visible_child_tag_ids parent_tag_id, graph
-    cache = graph[:visible_child_tag_ids_by_parent_id]
-    return cache[parent_tag_id] if cache.key?(parent_tag_id)
-
-    visible_ids = Set.new
-
-    graph[:children_by_parent_id][parent_tag_id].each do |child_tag_id|
-      collect_visible_child_tag_ids(child_tag_id, graph, visible_ids, Set.new([parent_tag_id]))
-    end
-
-    cache[parent_tag_id] = visible_ids.to_a
-  end
-
-  def collect_visible_child_tag_ids tag_id, graph, visible_ids, seen
-    return if seen.include?(tag_id)
-
-    seen = seen.dup << tag_id
-    tag = graph[:tags_by_id][tag_id]
-    return unless tag
-
-    if tag[:deprecated]
-      graph[:children_by_parent_id][tag_id].each do |child_tag_id|
-        collect_visible_child_tag_ids(child_tag_id, graph, visible_ids, seen)
-      end
-      return
-    end
-
-    visible_ids << tag_id if with_depth_visible_tag?(tag)
-  end
-
-  def with_depth_visible_tag? tag
-    tag[:category].in?(['meme', 'character', 'material']) && !tag[:deprecated]
-  end
-
   def build_tag_children tag
     material = tag.materials.first
+    file = nil
+    content_type = nil
+    if material&.file&.attached?
+      file = rails_storage_proxy_url(material.file, only_path: false)
+      content_type = material.file.blob.content_type
+    end
 
     TagRepr.base(tag).merge(
         children: tag.children.sort_by { _1.name }.map { build_tag_children(_1) },
-        material: material && MaterialRepr.base(material, host: request.base_url))
+        material: material.as_json&.merge(file:, content_type:))
   end
 
   def record_tag_version! tag, event_type:, created_by_user:, name_changed: false, wiki_page: nil

backend/app/controllers/wiki_pages_controller.rb

@@ -4,18 +4,17 @@ class WikiPagesController < ApplicationController
   def index
     title = params[:title].to_s.strip
     if title.blank?
-      return render json: WikiPageRepr.base(
-          WikiPage.joins(:tag_name).includes(tag_name: :tag))
+      return render json: WikiPageRepr.base(WikiPage.joins(:tag_name).includes(:tag_name))
     end
 
-    q = WikiPage.joins(:tag_name).includes(tag_name: :tag)
+    q = WikiPage.joins(:tag_name).includes(:tag_name)
         .where('tag_names.name LIKE ?', "%#{ WikiPage.sanitize_sql_like(title) }%")
     render json: WikiPageRepr.base(q.limit(20))
   end
 
   def show
     page = WikiPage.joins(:tag_name)
-                   .includes(tag_name: :tag)
+                   .includes(:tag_name)
                    .find_by(id: params[:id])
     render_wiki_page_or_404 page
   end
@@ -23,7 +22,7 @@ class WikiPagesController < ApplicationController
   def show_by_title
     title = params[:title].to_s.strip
     page = WikiPage.joins(:tag_name)
-                   .includes(tag_name: :tag)
+                   .includes(:tag_name)
                    .find_by(tag_name: { name: title })
     render_wiki_page_or_404 page
   end
@@ -52,7 +51,7 @@ class WikiPagesController < ApplicationController
     from = params[:from].presence
     to = params[:to].presence
 
-    page = WikiPage.joins(:tag_name).includes(tag_name: :tag).find(id)
+    page = WikiPage.joins(:tag_name).includes(:tag_name).find(id)
 
     from_rev = from && page.wiki_revisions.find(from)
     to_rev = to ? page.wiki_revisions.find(to) : page.current_revision
@@ -77,7 +76,6 @@ class WikiPagesController < ApplicationController
 
     render json: { wiki_page_id:      page.id,
                    title:             page.title,
-                   deprecated_at:     page.deprecated_at,
                    older_revision_id: from_rev&.id,
                    newer_revision_id: to_rev.id,
                    diff:              diff_json }
@@ -159,7 +157,7 @@ class WikiPagesController < ApplicationController
   def changes
     id = params[:id].presence
     q = WikiRevision.joins(wiki_page: :tag_name)
-                    .includes(:created_user, wiki_page: { tag_name: :tag })
+                    .includes(:created_user, wiki_page: :tag_name)
                     .order(id: :desc)
     q = q.where(wiki_page_id: id) if id
 
@@ -167,9 +165,7 @@ class WikiPagesController < ApplicationController
       { revision_id:  rev.id,
         pred:         rev.base_revision_id,
         succ:         nil,
-        wiki_page:    { id: rev.wiki_page_id,
-                        title: rev.wiki_page.title,
-                        deprecated_at: rev.wiki_page.deprecated_at },
+        wiki_page:    { id: rev.wiki_page_id, title: rev.wiki_page.title },
         user:         rev.created_user && { id: rev.created_user.id, name: rev.created_user.name },
         kind:         rev.kind,
         message:      rev.message,

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_answer', '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
-
-    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

@@ -1,12 +0,0 @@
-class GekanatorQuestionSuggestion < ApplicationRecord
-  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] }
-end

backend/app/models/material.rb

@@ -9,10 +9,6 @@ class Material < ApplicationRecord
   belongs_to :tag, optional: true
   belongs_to :created_by_user, class_name: 'User', optional: true
   belongs_to :updated_by_user, class_name: 'User', optional: true
-  belongs_to :file_suppressed_by_user, class_name: 'User', optional: true
-
-  has_many :material_versions, dependent: :destroy
-  has_many :material_export_items, dependent: :destroy
 
   has_one_attached :file, dependent: :purge
 
@@ -22,18 +18,11 @@ class Material < ApplicationRecord
   validate :tag_must_be_material_category
 
   def content_type
-    return nil if file_suppressed?
     return nil unless file&.attached?
 
     file.blob.content_type
   end
 
-  def file_suppressed? = file_suppressed_at.present?
-
-  def snapshot_export_paths
-    material_export_items.order(:profile).pluck(:profile, :export_path).to_h
-  end
-
   private
 
   def file_must_be_attached

backend/app/models/material_export_item.rb

@@ -1,48 +0,0 @@
-class MaterialExportItem < ApplicationRecord
-  VALID_PROFILES = ['legacy_drive'].freeze
-
-  belongs_to :material
-  belongs_to :created_by_user, class_name: 'User', optional: true
-
-  validates :profile, presence: true, inclusion: { in: VALID_PROFILES }
-  validates :export_path, presence: true, uniqueness: { scope: :profile }
-  validates :material_id, uniqueness: { scope: :profile }
-  validate :export_path_must_be_relative_safe_path
-
-  scope :enabled, -> { where(enabled: true) }
-
-  private
-
-  def export_path_must_be_relative_safe_path
-    return if export_path.blank?
-
-    if export_path.start_with?('/')
-      errors.add(:export_path, '絶対パスは使へません．')
-    end
-
-    if export_path.match?(/\A[A-Za-z]:\//)
-      errors.add(:export_path, '絶対パスは使へません．')
-    end
-
-    if export_path.include?('\\')
-      errors.add(:export_path, '/ 区切りで指定してください．')
-    end
-
-    if export_path.include?("\0")
-      errors.add(:export_path, 'NUL は使へません．')
-    end
-
-    parts = export_path.split('/')
-    if export_path.include?('//')
-      errors.add(:export_path, '空の path segment は使へません．')
-    end
-
-    if parts.any? { |part| part.in?(['.', '..']) }
-      errors.add(:export_path, '.. は使へません．')
-    end
-
-    if export_path.end_with?('/')
-      errors.add(:export_path, 'directory path は使へません．')
-    end
-  end
-end

backend/app/models/material_import_block.rb

@@ -1,29 +0,0 @@
-class MaterialImportBlock < ApplicationRecord
-  MATCH_KINDS = ['sha256', 'exact_path', 'path_prefix', 'manual'].freeze
-  REASONS = [
-    'copyright_high_risk',
-    'copyright_takedown',
-    'adult_or_sensitive',
-    'personal_information',
-    'malware_or_dangerous_file',
-    'duplicate_or_low_quality',
-    'source_owner_request',
-    'other'
-  ].freeze
-
-  belongs_to :created_by_user, class_name: 'User', optional: true
-
-  validates :match_kind, presence: true, inclusion: { in: MATCH_KINDS }
-  validates :reason, presence: true, inclusion: { in: REASONS }
-  validates :sha256, length: { is: 64 }, allow_blank: true
-  validate :match_value_must_be_present
-
-  private
-
-  def match_value_must_be_present
-    return if match_kind == 'manual'
-    return if sha256.present? || external_path_pattern.present?
-
-    errors.add(:base, 'sha256 または external_path_pattern は必須です．')
-  end
-end

backend/app/models/material_version.rb

@@ -1,18 +0,0 @@
-class MaterialVersion < ApplicationRecord
-  EVENT_TYPE_MAP = { create: 'create',
-                     update: 'update',
-                     discard: 'discard',
-                     restore: 'restore',
-                     suppress: 'suppress' }.freeze
-
-  include VersionRecord
-
-  belongs_to :material
-  belongs_to :tag, optional: true
-  belongs_to :parent, class_name: 'Material', optional: true
-  belongs_to :updated_by_user, class_name: 'User', optional: true
-
-  def export_paths_hash
-    export_paths_json || {}
-  end
-end

backend/app/models/post.rb

@@ -7,23 +7,10 @@ class Post < ApplicationRecord
   has_many :active_post_tags, -> { kept }, class_name: 'PostTag', inverse_of: :post
   has_many :post_tags_with_discarded, -> { with_discarded }, class_name: 'PostTag'
   has_many :tags, through: :active_post_tags
-  has_many :active_tags, -> { where(tags: { deprecated_at: nil }) },
-           through: :active_post_tags, source: :tag
 
   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

@@ -8,15 +8,6 @@ class Tag < ApplicationRecord
     ;
   end
 
-  class DeprecatedTagNormalisationError < ArgumentError
-    attr_reader :tag_names
-
-    def initialize tag_names
-      @tag_names = Array(tag_names)
-      super('deprecated tags are not allowed')
-    end
-  end
-
   has_many :post_tags, inverse_of: :tag
   has_many :active_post_tags, -> { kept }, class_name: 'PostTag', inverse_of: :tag
   has_many :post_tags_with_discarded, -> { with_discarded }, class_name: 'PostTag'
@@ -67,7 +58,6 @@ class Tag < ApplicationRecord
   validate :nico_tag_name_must_start_with_nico
   validate :tag_name_must_be_canonical
   validate :category_must_be_deerjikist_with_deerjikists
-  validate :nico_tags_cannot_be_deprecated
 
   scope :nico_tags, -> { nico }
 
@@ -87,8 +77,6 @@ class Tag < ApplicationRecord
     (self.tag_name ||= build_tag_name).name = val
   end
 
-  def deprecated? = deprecated_at?
-
   def has_wiki = wiki_page.present?
 
   def material_id = materials.first&.id
@@ -104,8 +92,7 @@ class Tag < ApplicationRecord
 
   def self.normalise_tags! tag_names, with_tagme: true,
                                       with_no_deerjikist: true,
-                                      deny_nico: true,
-                                      deny_deprecated: false
+                                      deny_nico: true
     if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end
@@ -114,10 +101,6 @@ class Tag < ApplicationRecord
       pf, cat = CATEGORY_PREFIXES.find { |p, _| name.downcase.start_with?(p) } || ['', nil]
       name = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
       find_or_create_by_tag_name!(name, category: (cat || :general)).tap do |tag|
-        if deny_deprecated && tag.deprecated?
-          raise DeprecatedTagNormalisationError, [tag.name]
-        end
-
         tag.update!(category: cat) if cat && tag.category != cat
       end
     end
@@ -245,10 +228,4 @@ class Tag < ApplicationRecord
       errors.add :category, 'ニジラーと紐づいてゐるタグはニジラー・カテゴリである必要があります．'
     end
   end
-
-  def nico_tags_cannot_be_deprecated
-    if nico? && deprecated_at.present?
-      errors.add :deprecated_at, 'ニコタグは廃止できません．'
-    end
-  end
 end

backend/app/models/version_record.rb

@@ -1,23 +1,15 @@
 module VersionRecord
   extend ActiveSupport::Concern
 
-  DEFAULT_EVENT_TYPE_MAP = { create: 'create',
-                             update: 'update',
-                             discard: 'discard',
-                             restore: 'restore' }.freeze
-
   def readonly? = persisted?
 
   included do
-    event_type_map = if const_defined?(:EVENT_TYPE_MAP, false)
-                       const_get(:EVENT_TYPE_MAP)
-                     else
-                       DEFAULT_EVENT_TYPE_MAP
-                     end
-
     belongs_to :created_by_user, class_name: 'User', optional: true
 
-    enum :event_type, event_type_map, prefix: true, validate: true
+    enum :event_type, { create: 'create',
+                        update: 'update',
+                        discard: 'discard',
+                        restore: 'restore' }, prefix: true, validate: true
 
     validates :version_no, presence: true, numericality: { only_integer: true, greater_than: 0 }
     validates :event_type, presence: true

backend/app/models/wiki_page.rb

@@ -22,7 +22,6 @@ class WikiPage < ApplicationRecord
   validates :body, presence: true
 
   def title = tag_name.name
-  def deprecated_at = tag_name.tag&.deprecated_at
 
   def title= val
     (self.tag_name ||= build_tag_name).name = val

backend/app/representations/material_repr.rb

@@ -2,8 +2,7 @@
 
 
 module MaterialRepr
-  BASE = { only: [:id, :url, :version_no, :file_suppressed_at,
-                  :file_suppression_reason, :created_at, :updated_at],
+  BASE = { only: [:id, :url, :created_at, :updated_at],
            methods: [:content_type],
            include: { tag: TagRepr::BASE,
                       created_by_user: UserRepr::BASE,
@@ -13,30 +12,13 @@ module MaterialRepr
 
   def base material, host:
     material.as_json(BASE).merge(
-        file: if material.file.attached? && !material.file_suppressed?
+        file: if material.file.attached?
                 Rails.application.routes.url_helpers.rails_storage_proxy_url(
                     material.file, host:)
-              end,
-        export_paths: export_paths(material),
-        export_items: export_items(material))
+              end)
   end
 
   def many materials, host:
     materials.map { |m| base(m, host:) }
   end
-
-  def export_paths material
-    material.material_export_items.each_with_object({ }) do |item, hash|
-      hash[item.profile] = item.enabled ? item.export_path : ''
-    end
-  end
-
-  def export_items material
-    material.material_export_items.map do |item|
-      { id: item.id,
-        profile: item.profile,
-        export_path: item.export_path,
-        enabled: item.enabled }
-    end
-  end
 end

backend/app/representations/post_repr.rb

@@ -53,7 +53,7 @@ module PostRepr
   end
 
   def tag_json tags
-    tags.reject(&:deprecated?).map { |tag| TagRepr.inline(tag) }
+    tags.map { |tag| TagRepr.inline(tag) }
   end
 
   def thumbnail_url post

backend/app/representations/tag_repr.rb

@@ -2,7 +2,7 @@
 
 
 module TagRepr
-  BASE = { only: [:id, :category, :post_count, :created_at, :updated_at, :deprecated_at],
+  BASE = { only: [:id, :category, :post_count, :created_at, :updated_at],
            methods: [:name, :has_wiki, :material_id, :has_deerjikists] }.freeze
 
   module_function

backend/app/representations/wiki_page_repr.rb

@@ -2,7 +2,7 @@
 
 
 module WikiPageRepr
-  BASE = { methods: [:title, :deprecated_at] }.freeze
+  BASE = { methods: [:title] }.freeze
 
   module_function
 

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/material_file_sha256.rb

@@ -1,34 +0,0 @@
-require 'digest'
-
-class MaterialFileSha256
-  def self.from_blob blob, allow_download: false
-    sha256 = blob.metadata['sha256']
-    return sha256 if sha256.present?
-    return nil unless allow_download
-
-    begin
-      blob.open do |file|
-        sha256 = Digest::SHA256.file(file.path).hexdigest
-        blob.metadata['sha256'] = sha256
-        blob.save! if blob.changed?
-        sha256
-      end
-    rescue ActiveStorage::FileNotFoundError, ArgumentError => error
-      Rails.logger.warn(
-          "MaterialFileSha256.from_blob failed for blob_id=#{blob.id}: " \
-          "#{error.class}: #{error.message}",
-      )
-      nil
-    end
-  end
-
-  def self.from_upload upload
-    tempfile = upload&.tempfile
-    return nil unless tempfile
-
-    tempfile.rewind
-    Digest::SHA256.file(tempfile.path).hexdigest.tap do
-      tempfile.rewind
-    end
-  end
-end

backend/app/services/material_import_block_matcher.rb

@@ -1,7 +0,0 @@
-class MaterialImportBlockMatcher
-  def self.match_for_sha256 sha256
-    return nil if sha256.blank?
-
-    MaterialImportBlock.find_by(match_kind: 'sha256', sha256:)
-  end
-end

backend/app/services/material_version_recorder.rb

@@ -1,70 +0,0 @@
-class MaterialVersionRecorder < VersionRecorder
-  EVENT_TYPES = ['create', 'update', 'discard', 'restore', 'suppress'].freeze
-
-  def self.record! material:, event_type:, created_by_user:, file_snapshot: nil
-    new(material:, event_type:, created_by_user:, file_snapshot:).record!
-  end
-
-  def initialize material:, event_type:, created_by_user:, file_snapshot: nil
-    @file_snapshot = file_snapshot
-
-    super(record: material, event_type:, created_by_user:)
-  end
-
-  def self.ensure_snapshot! material, created_by_user:
-    return if material.material_versions.exists?
-
-    record!(material:, event_type: :create,
-            created_by_user: material.created_by_user || created_by_user)
-  end
-
-  private
-
-  def version_class = MaterialVersion
-  def version_association = :material_versions
-  def record_key = :material
-
-  def snapshot_attributes
-    blob = @record.file.attached? ? @record.file.blob : nil
-    file_snapshot = build_file_snapshot(blob)
-
-    { url: @record.url,
-      parent: @record.parent,
-      tag: @record.tag,
-      tag_name: @record.tag&.name,
-      tag_category: @record.tag&.category,
-      export_paths_json: @record.snapshot_export_paths,
-      discarded_at: @record.discarded_at,
-      file_blob_id: file_snapshot[:file_blob_id],
-      file_filename: file_snapshot[:file_filename],
-      file_content_type: file_snapshot[:file_content_type],
-      file_byte_size: file_snapshot[:file_byte_size],
-      file_checksum: file_snapshot[:file_checksum],
-      file_sha256: file_snapshot[:file_sha256],
-      file_suppressed_at: @record.file_suppressed_at,
-      file_suppression_reason: @record.file_suppression_reason }
-  end
-
-  def build_file_snapshot blob
-    return @file_snapshot if @file_snapshot
-    return empty_file_snapshot unless blob
-
-    { file_blob_id: blob.id,
-      file_filename: blob.filename.to_s,
-      file_content_type: blob.content_type,
-      file_byte_size: blob.byte_size,
-      file_checksum: blob.checksum,
-      file_sha256: blob.metadata['sha256'] }
-  end
-
-  def empty_file_snapshot
-    { file_blob_id: nil,
-      file_filename: nil,
-      file_content_type: nil,
-      file_byte_size: nil,
-      file_checksum: nil,
-      file_sha256: nil }
-  end
-
-  def event_types = self.class::EVENT_TYPES
-end

backend/app/services/material_zip_exporter.rb

@@ -1,149 +0,0 @@
-require 'stringio'
-require 'zlib'
-
-# Initial implementation keeps every file payload and the final ZIP in memory.
-# Keep this service boundary stable so job/cached export paths can replace it later.
-class MaterialZipExporter
-  Entry = Struct.new(:path, :data, :mtime, keyword_init: true)
-  MissingFile = Struct.new(:material_id, :export_path, :blob_id, :filename, keyword_init: true)
-
-  class EmptyExportError < StandardError; end
-  class DuplicatePathError < StandardError; end
-  class MissingFileError < StandardError
-    attr_reader :missing_files
-
-    def initialize missing_files
-      @missing_files = missing_files
-
-      super("Missing files: #{missing_files.map(&:export_path).join(', ')}")
-    end
-  end
-
-  def initialize profile: 'legacy_drive', tag_id: nil
-    @profile = profile.presence || 'legacy_drive'
-    @tag_id = tag_id.presence
-  end
-
-  def export
-    entries = build_entries
-    raise EmptyExportError if entries.empty?
-
-    ZipWriter.write(entries)
-  end
-
-  private
-
-  def build_entries
-    rows = MaterialExportItem
-           .enabled
-           .includes(material: { file_attachment: :blob })
-           .joins(:material)
-           .merge(Material.kept)
-           .where(profile: @profile)
-           .where(materials: { file_suppressed_at: nil })
-           .order(:export_path)
-
-    rows = rows.where(materials: { tag_id: @tag_id }) if @tag_id
-
-    missing_files = []
-
-    entries = rows.filter_map do |item|
-      material = item.material
-      next unless material.file.attached?
-
-      data = download_blob(item, missing_files)
-      next unless data
-
-      Entry.new(path: item.export_path,
-                data:,
-                mtime: material.updated_at || Time.current)
-    end
-
-    raise MissingFileError.new(missing_files) if missing_files.any?
-
-    paths = entries.map(&:path)
-    duplicated = paths.find { |path| paths.count(path) > 1 }
-    raise DuplicatePathError, duplicated if duplicated
-
-    entries
-  end
-
-  def download_blob item, missing_files
-    blob = item.material.file.blob
-
-    blob.download
-  rescue ActiveStorage::FileNotFoundError
-    missing_files << MissingFile.new(
-        material_id: item.material_id,
-        export_path: item.export_path,
-        blob_id: blob.id,
-        filename: blob.filename.to_s,
-    )
-    nil
-  end
-
-  class ZipWriter
-    VERSION_NEEDED = 20
-    GP_FLAG = 0x0800
-    COMPRESSION_STORE = 0
-
-    def self.write entries
-      new(entries).write
-    end
-
-    def initialize entries
-      @entries = entries
-      @central_directory = []
-    end
-
-    def write
-      io = StringIO.new(''.b)
-
-      @entries.each do |entry|
-        write_entry(io, entry)
-      end
-
-      central_start = io.pos
-      @central_directory.each { |header| io.write(header) }
-      central_size = io.pos - central_start
-
-      io.write([0x06054b50, 0, 0, @entries.size, @entries.size,
-                central_size, central_start, 0].pack('VvvvvVVv'))
-      io.string
-    end
-
-    private
-
-    def write_entry io, entry
-      path = entry.path.b
-      data = entry.data.b
-      crc32 = Zlib.crc32(data)
-      dos_time, dos_date = dos_timestamp(entry.mtime)
-      offset = io.pos
-
-      local_header = [0x04034b50, VERSION_NEEDED, GP_FLAG, COMPRESSION_STORE,
-                      dos_time, dos_date, crc32, data.bytesize, data.bytesize,
-                      path.bytesize, 0].pack('VvvvvvVVVvv')
-
-      io.write(local_header)
-      io.write(path)
-      io.write(data)
-
-      @central_directory << central_header(path:, crc32:, size: data.bytesize,
-                                           dos_time:, dos_date:, offset:)
-    end
-
-    def central_header path:, crc32:, size:, dos_time:, dos_date:, offset:
-      [0x02014b50, VERSION_NEEDED, VERSION_NEEDED, GP_FLAG, COMPRESSION_STORE,
-       dos_time, dos_date, crc32, size, size, path.bytesize, 0, 0, 0, 0, 0,
-       offset].pack('VvvvvvvVVVvvvvvVV') + path
-    end
-
-    def dos_timestamp time
-      local = time.to_time
-      dos_time = (local.hour << 11) | (local.min << 5) | (local.sec / 2)
-      dos_date = ((local.year - 1980) << 9) | (local.month << 5) | local.day
-      [dos_time, dos_date]
-    end
-  end
-end

backend/app/services/similarity/calc.rb

@@ -1,6 +1,6 @@
 module Similarity
   class Calc
-    def self.call model, tgt, scope: nil
+    def self.call model, tgt
       similarity_model = "#{ model.name }Similarity".constantize
 
       # 最大保存件数
@@ -8,8 +8,7 @@ module Similarity
 
       similarity_model.delete_all
 
-      scope ||= model.all
-      posts = scope.includes(tgt).select(:id).to_a
+      posts = model.includes(tgt).select(:id).to_a
 
       tag_ids = { }
       tag_cnts = { }

backend/app/services/tag_version_recorder.rb

@@ -16,7 +16,6 @@ class TagVersionRecorder < VersionRecorder
   def snapshot_attributes
     { name: @record.name,
       category: @record.category,
-      deprecated_at: @record.deprecated_at,
       aliases: @record.snapshot_aliases.join(' '),
       parent_tag_ids: @record.snapshot_parent_tag_ids.join(' ') }
   end

backend/app/services/version_recorder.rb

@@ -73,7 +73,7 @@ class VersionRecorder
   end
 
   def validate_event_type!
-    return if event_types.include?(@event_type)
+    return if EVENT_TYPES.include?(@event_type)
 
     raise ArgumentError, "Invalid event_type: #{ @event_type }"
   end
@@ -84,5 +84,4 @@ class VersionRecorder
   def snapshot_attributes = raise NotImplementedError
 
   def record_class = @record.class
-  def event_types = self.class::EVENT_TYPES
 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
@@ -113,10 +95,5 @@ Rails.application.routes.draw do
     resources :skip_events, controller: :theatre_skip_events, only: [:index]
   end
 
-  get 'materials/download.zip', to: 'materials#download'
-  resources :materials, only: [:index, :show, :create, :update, :destroy] do
-    member do
-      patch :suppress_file
-    end
-  end
+  resources :materials, only: [:index, :show, :create, :update, :destroy]
 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/migrate/20260621000000_add_deprecated_at_to_tags.rb

@@ -1,20 +0,0 @@
-class AddDeprecatedAtToTags < ActiveRecord::Migration[8.0]
-  def up
-    add_column :tags, :deprecated_at, :datetime, after: :category
-    add_column :tag_versions, :deprecated_at, :datetime, after: :parent_tag_ids
-
-    add_index :tags, :deprecated_at
-
-    add_check_constraint :tags, "deprecated_at IS NULL OR category <> 'nico'",
-                         name: 'chk_tags_deprecated_at_not_nico'
-  end
-
-  def down
-    remove_check_constraint :tags, name: 'chk_tags_deprecated_at_not_nico'
-
-    remove_index :tags, :deprecated_at
-
-    remove_column :tag_versions, :deprecated_at, :datetime
-    remove_column :tags, :deprecated_at
-  end
-end

backend/db/migrate/20260623000000_enhance_material_management.rb

@@ -1,98 +0,0 @@
-class EnhanceMaterialManagement < ActiveRecord::Migration[8.0]
-  def up
-    change_table :materials, bulk: true do |t|
-      t.integer :version_no, null: false, default: 1
-      t.datetime :file_suppressed_at
-      t.references :file_suppressed_by_user, foreign_key: { to_table: :users }
-      t.string :file_suppression_reason
-    end
-
-    change_table :material_versions, bulk: true do |t|
-      t.string :event_type
-      t.string :tag_name
-      t.string :tag_category
-      t.json :export_paths_json
-      t.bigint :file_blob_id
-      t.string :file_filename
-      t.string :file_content_type
-      t.bigint :file_byte_size
-      t.string :file_checksum
-      t.string :file_sha256
-      t.datetime :file_suppressed_at
-      t.string :file_suppression_reason
-    end
-
-    execute <<~SQL.squish
-      UPDATE material_versions
-      SET event_type = CASE
-                       WHEN version_no = 1 THEN 'create'
-                       ELSE 'update'
-                       END
-      WHERE event_type IS NULL
-    SQL
-
-    change_column_null :material_versions, :event_type, false
-    add_index :material_versions, :file_blob_id
-
-    add_check_constraint :material_versions,
-                         "event_type IN ('create', 'update', 'discard', 'restore', 'suppress')",
-                         name: 'material_versions_event_type_valid'
-
-    create_table :material_export_items do |t|
-      t.references :material, null: false, foreign_key: true
-      t.string :profile, null: false, default: 'legacy_drive'
-      t.string :export_path, null: false
-      t.boolean :enabled, null: false, default: true
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.index [:profile, :export_path], unique: true
-      t.index [:material_id, :profile], unique: true
-    end
-
-    create_table :material_import_blocks do |t|
-      t.string :match_kind, null: false
-      t.string :sha256
-      t.string :external_path_pattern
-      t.string :reason, null: false
-      t.text :note
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-    end
-
-    execute <<~SQL.squish
-      UPDATE materials
-      SET version_no = COALESCE(
-        (SELECT MAX(material_versions.version_no)
-         FROM material_versions
-         WHERE material_versions.material_id = materials.id),
-        1)
-    SQL
-  end
-
-  def down
-    drop_table :material_import_blocks
-    drop_table :material_export_items
-
-    remove_check_constraint :material_versions, name: 'material_versions_event_type_valid'
-
-    remove_index :material_versions, :file_blob_id
-    remove_column :material_versions, :event_type
-    remove_column :material_versions, :tag_name
-    remove_column :material_versions, :tag_category
-    remove_column :material_versions, :export_paths_json
-    remove_column :material_versions, :file_blob_id
-    remove_column :material_versions, :file_filename
-    remove_column :material_versions, :file_content_type
-    remove_column :material_versions, :file_byte_size
-    remove_column :material_versions, :file_checksum
-    remove_column :material_versions, :file_sha256
-    remove_column :material_versions, :file_suppressed_at
-    remove_column :material_versions, :file_suppression_reason
-
-    remove_reference :materials, :file_suppressed_by_user, foreign_key: { to_table: :users }
-    remove_column :materials, :version_no
-    remove_column :materials, :file_suppressed_at
-    remove_column :materials, :file_suppression_reason
-  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_23_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_06_06_000000) 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_23_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"
@@ -130,32 +57,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_000000) do
     t.index ["ip_address"], name: "index_ip_addresses_on_ip_address", unique: true
   end
 
-  create_table "material_export_items", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "material_id", null: false
-    t.string "profile", default: "legacy_drive", null: false
-    t.string "export_path", null: false
-    t.boolean "enabled", default: true, null: false
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_material_export_items_on_created_by_user_id"
-    t.index ["material_id", "profile"], name: "index_material_export_items_on_material_id_and_profile", unique: true
-    t.index ["material_id"], name: "index_material_export_items_on_material_id"
-    t.index ["profile", "export_path"], name: "index_material_export_items_on_profile_and_export_path", unique: true
-  end
-
-  create_table "material_import_blocks", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "match_kind", null: false
-    t.string "sha256"
-    t.string "external_path_pattern"
-    t.string "reason", null: false
-    t.text "note"
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_material_import_blocks_on_created_by_user_id"
-  end
-
   create_table "material_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "material_id", null: false
     t.integer "version_no", null: false
@@ -167,28 +68,14 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_000000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
-    t.string "event_type", null: false
-    t.string "tag_name"
-    t.string "tag_category"
-    t.json "export_paths_json"
-    t.bigint "file_blob_id"
-    t.string "file_filename"
-    t.string "file_content_type"
-    t.bigint "file_byte_size"
-    t.string "file_checksum"
-    t.string "file_sha256"
-    t.datetime "file_suppressed_at"
-    t.string "file_suppression_reason"
     t.index ["created_by_user_id"], name: "index_material_versions_on_created_by_user_id"
     t.index ["discarded_at"], name: "index_material_versions_on_discarded_at"
-    t.index ["file_blob_id"], name: "index_material_versions_on_file_blob_id"
     t.index ["material_id", "version_no"], name: "index_material_versions_on_material_id_and_version_no", unique: true
     t.index ["material_id"], name: "index_material_versions_on_material_id"
     t.index ["parent_id"], name: "index_material_versions_on_parent_id"
     t.index ["tag_id"], name: "index_material_versions_on_tag_id"
     t.index ["updated_by_user_id"], name: "index_material_versions_on_updated_by_user_id"
     t.index ["url"], name: "index_material_versions_on_url"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore',_utf8mb4'suppress')", name: "material_versions_event_type_valid"
   end
 
   create_table "materials", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -201,14 +88,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_000000) do
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
     t.virtual "active_url", type: :string, as: "if((`discarded_at` is null),`url`,NULL)"
-    t.integer "version_no", default: 1, null: false
-    t.datetime "file_suppressed_at"
-    t.bigint "file_suppressed_by_user_id"
-    t.string "file_suppression_reason"
     t.index ["active_url"], name: "index_materials_on_active_url", unique: true
     t.index ["created_by_user_id"], name: "index_materials_on_created_by_user_id"
     t.index ["discarded_at"], name: "index_materials_on_discarded_at"
-    t.index ["file_suppressed_by_user_id"], name: "index_materials_on_file_suppressed_by_user_id"
     t.index ["parent_id"], name: "index_materials_on_parent_id"
     t.index ["tag_id"], name: "index_materials_on_tag_id"
     t.index ["updated_by_user_id"], name: "index_materials_on_updated_by_user_id"
@@ -364,7 +246,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_000000) do
     t.string "event_type", null: false
     t.string "name", null: false
     t.string "category", null: false
-    t.datetime "deprecated_at"
     t.text "aliases", null: false
     t.text "parent_tag_ids", null: false
     t.datetime "created_at", null: false
@@ -382,13 +263,10 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_000000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.integer "post_count", default: 0, null: false
-    t.datetime "deprecated_at"
     t.datetime "discarded_at"
     t.integer "version_no", null: false
-    t.index ["deprecated_at"], name: "index_tags_on_deprecated_at"
     t.index ["discarded_at"], name: "index_tags_on_discarded_at"
     t.index ["tag_name_id"], name: "index_tags_on_tag_name_id", unique: true
-    t.check_constraint "(`deprecated_at` is null) or (`category` <> _utf8mb4'nico')", name: "chk_tags_deprecated_at_not_nico"
     t.check_constraint "`version_no` > 0", name: "chk_tags_version_no_positive"
   end
 
@@ -600,21 +478,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_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_export_items", "materials"
-  add_foreign_key "material_export_items", "users", column: "created_by_user_id"
-  add_foreign_key "material_import_blocks", "users", column: "created_by_user_id"
   add_foreign_key "material_versions", "materials"
   add_foreign_key "material_versions", "materials", column: "parent_id"
   add_foreign_key "material_versions", "tags"
@@ -623,7 +486,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_23_000000) do
   add_foreign_key "materials", "materials", column: "parent_id"
   add_foreign_key "materials", "tags"
   add_foreign_key "materials", "users", column: "created_by_user_id"
-  add_foreign_key "materials", "users", column: "file_suppressed_by_user_id"
   add_foreign_key "materials", "users", column: "updated_by_user_id"
   add_foreign_key "nico_tag_relations", "tags"
   add_foreign_key "nico_tag_relations", "tags", column: "nico_tag_id"

backend/lib/tasks/calc_post_similarities.rake

@@ -1,6 +1,6 @@
 namespace :post_similarity do
   desc '関聯投稿テーブル作成'
   task calc: :environment do
-    Similarity::Calc.call(Post, :active_tags)
+    Similarity::Calc.call(Post, :tags)
   end
 end

backend/lib/tasks/calc_tag_similarities.rake

@@ -1,6 +1,6 @@
 namespace :tag_similarity do
   desc '関聯タグ・テーブル作成'
   task calc: :environment do
-    Similarity::Calc.call(Tag, :posts, scope: Tag.where(deprecated_at: nil))
+    Similarity::Calc.call(Tag, :posts)
   end
 end

backend/spec/models/material_export_item_spec.rb

@@ -1,57 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe MaterialExportItem, type: :model do
-  let(:user) { create(:user, :member) }
-  let(:tag) { Tag.create!(tag_name: TagName.create!(name: 'export_item'), category: :material) }
-  let(:material) do
-    Material.create!(tag:, url: 'https://example.com/material',
-                     created_by_user: user, updated_by_user: user)
-  end
-
-  it 'rejects blank export_path' do
-    item = described_class.new(material:, profile: 'legacy_drive', export_path: '')
-
-    expect(item).not_to be_valid
-    expect(item.errors[:export_path]).to be_present
-  end
-
-  it 'rejects absolute export_path' do
-    item = described_class.new(material:, profile: 'legacy_drive',
-                               export_path: '/素材/a.png')
-
-    expect(item).not_to be_valid
-    expect(item.errors[:export_path]).to be_present
-  end
-
-  it 'rejects parent traversal export_path' do
-    item = described_class.new(material:, profile: 'legacy_drive',
-                               export_path: '素材/../a.png')
-
-    expect(item).not_to be_valid
-    expect(item.errors[:export_path]).to be_present
-  end
-
-  it 'rejects double slash export_path' do
-    item = described_class.new(material:, profile: 'legacy_drive',
-                               export_path: '素材//a.png')
-
-    expect(item).not_to be_valid
-    expect(item.errors[:export_path]).to be_present
-  end
-
-  it 'rejects dot segment export_path' do
-    item = described_class.new(material:, profile: 'legacy_drive',
-                               export_path: './素材/a.png')
-
-    expect(item).not_to be_valid
-    expect(item.errors[:export_path]).to be_present
-  end
-
-  it 'rejects trailing slash export_path' do
-    item = described_class.new(material:, profile: 'legacy_drive',
-                               export_path: '素材/a/')
-
-    expect(item).not_to be_valid
-    expect(item.errors[:export_path]).to be_present
-  end
-end

backend/spec/models/tag_name_sanitisation_rule_spec.rb

@@ -1,10 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe TagNameSanitisationRule, type: :model do
-  before do
-    described_class.unscoped.delete_all
-  end
-
   describe '.sanitise' do
     before do
       described_class.create!(priority: 10, source_pattern: '_', replacement: '')

backend/spec/models/tag_spec.rb

@@ -1,79 +1,6 @@
 require 'rails_helper'
 
 RSpec.describe Tag, type: :model do
-  describe '.normalise_tags!' do
-    it 'rejects deprecated tags when deny_deprecated is enabled' do
-      tag_name = TagName.create!(name: 'normalise deprecated tag')
-      deprecated_tag = Tag.create!(
-        tag_name:,
-        category: :general,
-        deprecated_at: 1.day.from_now
-      )
-
-      expect {
-        described_class.normalise_tags!(
-          [deprecated_tag.name],
-          deny_deprecated: true
-        )
-      }.to raise_error(Tag::DeprecatedTagNormalisationError) { |error|
-        expect(error.tag_names).to eq([deprecated_tag.name])
-      }
-    end
-  end
-
-  describe '.expand_parent_tags' do
-    it 'expands through multiple deprecated parents to an active ancestor' do
-      child = create(:tag, name: 'expand_child')
-      deprecated_parent = create(
-        :tag,
-        name: 'expand_deprecated_parent',
-        deprecated_at: Time.current
-      )
-      deprecated_grandparent = create(
-        :tag,
-        name: 'expand_deprecated_grandparent',
-        deprecated_at: Time.current
-      )
-      active_ancestor = create(:tag, name: 'expand_active_ancestor')
-      TagImplication.create!(tag: child, parent_tag: deprecated_parent)
-      TagImplication.create!(tag: deprecated_parent, parent_tag: deprecated_grandparent)
-      TagImplication.create!(tag: deprecated_grandparent, parent_tag: active_ancestor)
-
-      expanded = described_class.expand_parent_tags([child])
-
-      expect(expanded).to include(
-        child,
-        deprecated_parent,
-        deprecated_grandparent,
-        active_ancestor
-      )
-      expect(expanded.reject(&:deprecated?)).to contain_exactly(child, active_ancestor)
-    end
-
-    it 'terminates when implications contain a cycle' do
-      first = create(:tag, name: 'expand_cycle_first')
-      second = create(:tag, name: 'expand_cycle_second')
-      TagImplication.create!(tag: first, parent_tag: second)
-      TagImplication.create!(tag: second, parent_tag: first)
-
-      expect(described_class.expand_parent_tags([first])).to contain_exactly(first, second)
-    end
-  end
-
-  describe 'deprecated validation' do
-    it 'rejects deprecated nico tags' do
-      tag = build(
-        :tag,
-        name: 'nico:deprecated_validation',
-        category: :nico,
-        deprecated_at: Time.current
-      )
-
-      expect(tag).not_to be_valid
-      expect(tag.errors[:deprecated_at]).to include('ニコタグは廃止できません．')
-    end
-  end
-
   describe '.merge_tags!' do
     let!(:target_tag) { create(:tag, category: :general) }
     let!(:source_tag) { create(:tag, category: :general) }

backend/spec/requests/gekanator_games_spec.rb

@@ -1,76 +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 unauthorized without a 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(:unauthorized)
-    end
-
-    it 'stores a game 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(:created)
-      expect(GekanatorGame.find(json['id']).user).to eq(user)
-    end
-  end
-end

backend/spec/requests/gekanator_posts_spec.rb

@@ -1,33 +0,0 @@
-require 'rails_helper'
-
-
-RSpec.describe 'Gekanator posts API', type: :request do
-  describe 'GET /gekanator/posts' do
-    it 'omits deprecated tags and returns the stored similarity cosine' do
-      active_tag = Tag.create!(name: 'active tag', category: :general)
-      deprecated_tag = Tag.create!(
-        name: 'deprecated tag',
-        category: :general,
-        deprecated_at: Time.current
-      )
-      post_record = Post.create!(title: 'source', url: 'https://example.com/source')
-      target_post = Post.create!(title: 'target', url: 'https://example.com/target')
-
-      PostTag.create!(post: post_record, tag: active_tag)
-      PostTag.create!(post: post_record, tag: deprecated_tag)
-      PostTag.create!(post: target_post, tag: deprecated_tag)
-      PostSimilarity.create!(post: post_record, target_post:, cos: 0.375)
-
-      get '/gekanator/posts'
-
-      expect(response).to have_http_status(:ok)
-
-      post_json = json.fetch('posts').find { |post| post.fetch('id') == post_record.id }
-      expect(post_json.fetch('tags').map { |tag| tag.fetch('name') }).to eq(['active tag'])
-      expect(post_json.fetch('post_similarity_edges')).to contain_exactly(
-        'target_post_id' => target_post.id,
-        'cos' => 0.375
-      )
-    end
-  end
-end

backend/spec/requests/materials_spec.rb

@@ -1,10 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe 'Materials API', type: :request do
-  include ActiveJob::TestHelper
-
   let!(:member_user) { create(:user, :member) }
-  let!(:admin_user)  { create(:user, :admin) }
   let!(:guest_user)  { create(:user) }
 
   def dummy_upload(filename: 'dummy.png', type: 'image/png', body: 'dummy')
@@ -16,29 +13,22 @@ RSpec.describe 'Materials API', type: :request do
   end
 
   def build_material(tag:, user:, parent: nil, file: dummy_upload, url: nil)
-    Material.new(tag:, parent:, url:,
-                 created_by_user: user,
-                 updated_by_user: user).tap do |material|
+    Material.new(tag:, parent:, url:, created_by_user: user, updated_by_user: user).tap do |material|
       material.file.attach(file) if file
       material.save!
     end
   end
 
   describe 'GET /materials' do
-    let!(:tag_a) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_index_a'), category: :material)
-    end
-    let!(:tag_b) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_index_b'), category: :material)
-    end
+    let!(:tag_a) { Tag.create!(tag_name: TagName.create!(name: 'material_index_a'), category: :material) }
+    let!(:tag_b) { Tag.create!(tag_name: TagName.create!(name: 'material_index_b'), category: :material) }
 
     let!(:material_a) do
       build_material(tag: tag_a, user: member_user, file: dummy_upload(filename: 'a.png'))
     end
 
     let!(:material_b) do
-      build_material(tag: tag_b, user: member_user, parent: material_a,
-                     file: dummy_upload(filename: 'b.png'))
+      build_material(tag: tag_b, user: member_user, parent: material_a, file: dummy_upload(filename: 'b.png'))
     end
 
     before do
@@ -107,9 +97,7 @@ RSpec.describe 'Materials API', type: :request do
   end
 
   describe 'GET /materials/:id' do
-    let!(:tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_show'), category: :material)
-    end
+    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_show'), category: :material) }
     let!(:material) do
       build_material(tag:, user: member_user, file: dummy_upload(filename: 'show.png'))
     end
@@ -150,22 +138,9 @@ RSpec.describe 'Materials API', type: :request do
       end
     end
 
-    context 'when logged in but not member' do
+    context 'when logged in' do
       before { sign_in_as(guest_user) }
 
-      it 'returns 403' do
-        post '/materials', params: {
-          tag: 'material_create_guest_forbidden',
-          file: dummy_upload
-        }
-
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'when member' do
-      before { sign_in_as(member_user) }
-
       it 'returns 422 when tag is blank' do
         post '/materials', params: { tag: '   ', file: dummy_upload }
 
@@ -187,49 +162,24 @@ RSpec.describe 'Materials API', type: :request do
         expect do
           post '/materials', params: {
             tag: 'material_create_new',
-            file: dummy_upload(filename: 'created.png'),
-            export_paths: { legacy_drive: '伊地知ニジカ/created.png' }
+            file: dummy_upload(filename: 'created.png')
           }
         end.to change(Material, :count).by(1)
           .and change(Tag, :count).by(1)
           .and change(TagName, :count).by(1)
-          .and change(MaterialVersion, :count).by(1)
 
         expect(response).to have_http_status(:created)
 
         material = Material.order(:id).last
         expect(material.tag.name).to eq('material_create_new')
         expect(material.tag.category).to eq('material')
-        expect(material.created_by_user).to eq(member_user)
-        expect(material.updated_by_user).to eq(member_user)
+        expect(material.created_by_user).to eq(guest_user)
+        expect(material.updated_by_user).to eq(guest_user)
         expect(material.file.attached?).to be(true)
-        expect(material.version_no).to eq(1)
-        expect(material.material_versions.first.event_type).to eq('create')
-        expect(material.material_export_items.first.export_path).to eq('伊地知ニジカ/created.png')
-        expect(material.material_versions.first.export_paths_json).to eq(
-          'legacy_drive' => '伊地知ニジカ/created.png'
-        )
 
         expect(json['id']).to eq(material.id)
         expect(json.dig('tag', 'name')).to eq('material_create_new')
         expect(json['content_type']).to eq('image/png')
-        expect(json.dig('export_paths', 'legacy_drive')).to eq('伊地知ニジカ/created.png')
-      end
-
-      it 'snapshots attached file metadata and sha256' do
-        post '/materials', params: {
-          tag: 'material_create_file_version',
-          file: dummy_upload(filename: 'created.png', body: 'sha-body')
-        }
-
-        expect(response).to have_http_status(:created)
-
-        version = Material.order(:id).last.material_versions.first
-        expect(version.file_blob_id).to be_present
-        expect(version.file_filename).to eq('created.png')
-        expect(version.file_content_type).to eq('image/png')
-        expect(version.file_byte_size).to eq('sha-body'.bytesize)
-        expect(version.file_sha256).to eq(Digest::SHA256.hexdigest('sha-body'))
       end
 
       it 'returns 422 when the existing tag is not material/character' do
@@ -269,33 +219,11 @@ RSpec.describe 'Materials API', type: :request do
         expect(response).to have_http_status(:created)
         expect(json['url']).to eq('https://example.com/material-source')
       end
-
-      it 'rejects sha256-blocked file upload' do
-        sha256 = Digest::SHA256.hexdigest('blocked-body')
-        MaterialImportBlock.create!(match_kind: 'sha256',
-                                    sha256:,
-                                    reason: 'copyright_high_risk',
-                                    created_by_user: admin_user)
-
-        expect do
-          post '/materials', params: {
-            tag: 'material_blocked_create',
-            file: dummy_upload(filename: 'blocked.png', body: 'blocked-body')
-          }
-        end.not_to change(Material, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-          'file' => ['抑止された素材です: copyright_high_risk']
-        )
-      end
     end
   end
 
   describe 'PUT /materials/:id' do
-    let!(:tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_update_old'), category: :material)
-    end
+    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_update_old'), category: :material) }
     let!(:material) do
       build_material(tag:, user: member_user, file: dummy_upload(filename: 'old.png'))
     end
@@ -349,26 +277,25 @@ RSpec.describe 'Materials API', type: :request do
             'tag' => ['タグは必須です．'])
       end
 
-      it 'keeps the existing file when file and url are omitted' do
+      it 'returns 422 when both file and url are blank' do
         put "/materials/#{ material.id }", params: {
           tag: 'material_update_no_payload'
         }
 
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.file.attached?).to be(true)
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(json.fetch('errors')).to include(
+            'file' => ['ファイルまたは URL は必須です．'],
+            'url' => ['ファイルまたは URL は必須です．'])
       end
 
       it 'updates tag, url, file, and updated_by_user' do
         old_blob_id = material.file.blob.id
 
-        expect do
         put "/materials/#{ material.id }", params: {
           tag: 'material_update_new',
           url: 'https://example.com/updated-source',
-            file: dummy_upload(filename: 'updated.jpg', type: 'image/jpeg'),
-            export_paths: { legacy_drive: '伊地知ニジカ/updated.jpg' }
+          file: dummy_upload(filename: 'updated.jpg', type: 'image/jpeg')
         }
-        end.to change(MaterialVersion, :count).by(2)
 
         expect(response).to have_http_status(:ok)
 
@@ -379,15 +306,8 @@ RSpec.describe 'Materials API', type: :request do
         expect(material.updated_by_user).to eq(member_user)
         expect(material.file.attached?).to be(true)
         expect(material.file.blob.id).not_to eq(old_blob_id)
-        expect(ActiveStorage::Blob.where(id: old_blob_id).exists?).to be(true)
         expect(material.file.blob.filename.to_s).to eq('updated.jpg')
         expect(material.file.blob.content_type).to eq('image/jpeg')
-        expect(material.version_no).to eq(2)
-        expect(material.material_versions.order(:version_no).last.event_type).to eq('update')
-        expect(material.material_export_items.first.export_path).to eq('伊地知ニジカ/updated.jpg')
-        expect(material.material_versions.order(:version_no).last.export_paths_json).to eq(
-          'legacy_drive' => '伊地知ニジカ/updated.jpg'
-        )
 
         expect(json['id']).to eq(material.id)
         expect(json['file']).to be_present
@@ -395,7 +315,7 @@ RSpec.describe 'Materials API', type: :request do
         expect(json.dig('tag', 'name')).to eq('material_update_new')
       end
 
-      it 'detaches the existing file without purging blob when url replaces file' do
+      it 'purges the existing file when file is omitted and url is provided' do
         old_blob_id = material.file.blob.id
 
         put "/materials/#{ material.id }", params: {
@@ -411,7 +331,9 @@ RSpec.describe 'Materials API', type: :request do
         expect(material.updated_by_user).to eq(member_user)
         expect(material.file.attached?).to be(false)
 
-        expect(ActiveStorage::Blob.where(id: old_blob_id).exists?).to be(true)
+        expect(
+          ActiveStorage::Blob.where(id: old_blob_id).exists?
+        ).to be(false)
 
         expect(json['id']).to eq(material.id)
         expect(json['file']).to be_nil
@@ -419,190 +341,11 @@ RSpec.describe 'Materials API', type: :request do
         expect(json.dig('tag', 'name')).to eq('material_update_remove_file')
         expect(json['url']).to eq('https://example.com/updated-source')
       end
-
-      it 'does not increase version for the same snapshot update' do
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: member_user)
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_old'
-          }
-        end.not_to change(MaterialVersion, :count)
-
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.version_no).to eq(1)
-      end
-
-      it 'records update version when only export_path changes' do
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: member_user)
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_old',
-            export_paths: { legacy_drive: '素材/only-path.png' }
-          }
-        end.to change(MaterialVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.material_export_items.first.export_path).to eq('素材/only-path.png')
-        expect(material.material_versions.order(:version_no).last.export_paths_json).to eq(
-          'legacy_drive' => '素材/only-path.png'
-        )
-      end
-
-      it 'removes export_path item when blank is submitted' do
-        MaterialExportItem.create!(material:, profile: 'legacy_drive',
-                                   export_path: '素材/remove.png',
-                                   created_by_user: member_user)
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: member_user)
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_old',
-            export_paths: { legacy_drive: '' }
-          }
-        end.to change(MaterialExportItem, :count).by(-1)
-          .and change(MaterialVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.material_export_items).to be_empty
-        expect(material.material_versions.order(:version_no).last.export_paths_json).to eq({})
-      end
-
-      it 'rejects sha256-blocked replacement file' do
-        sha256 = Digest::SHA256.hexdigest('blocked-update')
-        MaterialImportBlock.create!(match_kind: 'sha256',
-                                    sha256:,
-                                    reason: 'source_owner_request',
-                                    created_by_user: admin_user)
-
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_old',
-          file: dummy_upload(filename: 'blocked.png', body: 'blocked-update')
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(material.reload.file.blob.filename.to_s).to eq('old.png')
-      end
-    end
-  end
-
-  describe 'GET /materials/download.zip' do
-    let!(:tag_a) { Tag.create!(tag_name: TagName.create!(name: 'zip_a'), category: :material) }
-    let!(:tag_b) { Tag.create!(tag_name: TagName.create!(name: 'zip_b'), category: :material) }
-    let!(:material_a) do
-      build_material(tag: tag_a, user: member_user,
-                     file: dummy_upload(filename: 'a.png', body: 'zip-a'))
-    end
-    let!(:material_b) do
-      build_material(tag: tag_b, user: member_user,
-                     file: dummy_upload(filename: 'b.png', body: 'zip-b'))
-    end
-
-    before do
-      MaterialExportItem.create!(material: material_a, profile: 'legacy_drive',
-                                 export_path: '素材/a.png',
-                                 created_by_user: member_user)
-      MaterialExportItem.create!(material: material_b, profile: 'legacy_drive',
-                                 export_path: '素材/b.png',
-                                 created_by_user: member_user)
-    end
-
-    it 'uses material_export_items.export_path as ZIP entry paths' do
-      get '/materials/download.zip', params: { profile: 'legacy_drive' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.media_type).to eq('application/zip')
-      expect(response.body.b).to include('素材/a.png'.b)
-      expect(response.body.b).to include('素材/b.png'.b)
-    end
-
-    it 'filters by tag_id' do
-      get '/materials/download.zip', params: { profile: 'legacy_drive', tag_id: tag_a.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.body.b).to include('素材/a.png'.b)
-      expect(response.body.b).not_to include('素材/b.png'.b)
-    end
-
-    it 'does not include suppressed materials' do
-      material_b.update!(file_suppressed_at: Time.current,
-                         file_suppression_reason: 'copyright_high_risk')
-
-      get '/materials/download.zip', params: { profile: 'legacy_drive' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.body.b).to include('素材/a.png'.b)
-      expect(response.body.b).not_to include('素材/b.png'.b)
-    end
-  end
-
-  describe 'PATCH /materials/:id/suppress_file' do
-    let!(:tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_suppress'), category: :material)
-    end
-    let!(:material) do
-      build_material(tag:, user: member_user, file: dummy_upload(filename: 'suppress.png'))
-    end
-
-    it 'allows admin to suppress a file and records a suppress version' do
-      sign_in_as(admin_user)
-      MaterialVersionRecorder.record!(material:, event_type: :create,
-                                      created_by_user: member_user)
-
-      expect do
-        patch "/materials/#{ material.id }/suppress_file",
-              params: { reason: 'copyright_high_risk' }
-      end.to change(MaterialVersion, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-
-      material.reload
-      expect(material.file_suppressed_at).to be_present
-      expect(material.file_suppressed_by_user).to eq(admin_user)
-      expect(material.file_suppression_reason).to eq('copyright_high_risk')
-      expect(material.material_versions.order(:version_no).last.event_type).to eq('suppress')
-      expect(json['file']).to be_nil
-      expect(json['file_suppressed_at']).to be_present
-    end
-
-    it 'purges blob when purge=true is requested' do
-      sign_in_as(admin_user)
-      old_blob_id = material.file.blob.id
-      MaterialVersionRecorder.record!(material:, event_type: :create,
-                                      created_by_user: member_user)
-
-      expect do
-        patch "/materials/#{ material.id }/suppress_file",
-              params: { reason: 'copyright_takedown', purge: '1' }
-      end.to have_enqueued_job(ActiveStorage::PurgeJob)
-
-      expect(response).to have_http_status(:ok)
-
-      version = material.material_versions.order(:version_no).last
-      expect(version.event_type).to eq('suppress')
-      expect(version.file_blob_id).to eq(old_blob_id)
-      expect(version.file_filename).to eq('suppress.png')
-      expect(version.file_sha256).to be_present
-    end
-
-    it 'rejects member suppression' do
-      sign_in_as(member_user)
-
-      patch "/materials/#{ material.id }/suppress_file",
-            params: { reason: 'copyright_high_risk' }
-
-      expect(response).to have_http_status(:forbidden)
     end
   end
 
   describe 'DELETE /materials/:id' do
-    let!(:tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_destroy'), category: :material)
-    end
+    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_destroy'), category: :material) }
     let!(:material) do
       build_material(tag:, user: member_user, file: dummy_upload(filename: 'destroy.png'))
     end

backend/spec/requests/posts_spec.rb

@@ -517,24 +517,6 @@ RSpec.describe 'Posts API', type: :request do
         expect([true, false]).to include(json['viewed'])
       end
 
-      it 'omits deprecated tags' do
-        deprecated_tag = Tag.create!(
-          name: 'deprecated_post_tag',
-          category: :general,
-          deprecated_at: Time.current
-        )
-        PostTag.create!(post: post_record, tag: deprecated_tag)
-
-        request
-
-        expect(response).to have_http_status(:ok)
-        tag_names = json.fetch('tags').flat_map { |node|
-          [node.fetch('name')] + node.fetch('children').map { |child| child.fetch('name') }
-        }
-        expect(tag_names).to include('spec_tag')
-        expect(tag_names).not_to include('deprecated_post_tag')
-      end
-
       context 'when post has parent, child, and sibling posts' do
         let!(:parent_post) do
           create_parent_post!(
@@ -715,58 +697,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(names).not_to include('manko')
     end
 
-    it 'rejects a deprecated tag specified directly' do
-      Tag.create!(
-        name: 'deprecated_direct_tag',
-        category: :general,
-        deprecated_at: Time.current
-      )
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'new post',
-        url: 'https://example.com/deprecated-direct-tag',
-        tags: 'deprecated_direct_tag',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-        'tags' => ['廃止済みタグは付与できません．']
-      )
-    end
-
-    it 'expands through multiple deprecated parent tags and saves active ancestors' do
-      child = Tag.create!(name: 'active_child', category: :general)
-      deprecated_parent = Tag.create!(
-        name: 'deprecated_parent',
-        category: :general,
-        deprecated_at: Time.current
-      )
-      deprecated_grandparent = Tag.create!(
-        name: 'deprecated_grandparent',
-        category: :general,
-        deprecated_at: Time.current
-      )
-      active_grandparent = Tag.create!(name: 'active_grandparent', category: :general)
-      TagImplication.create!(tag: child, parent_tag: deprecated_parent)
-      TagImplication.create!(tag: deprecated_parent, parent_tag: deprecated_grandparent)
-      TagImplication.create!(tag: deprecated_grandparent, parent_tag: active_grandparent)
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'expanded post',
-        url: 'https://example.com/expanded-deprecated-parent',
-        tags: 'active_child',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      saved_names = Post.find(json.fetch('id')).tags.map(&:name)
-      expect(saved_names).to include('active_child', 'active_grandparent')
-      expect(saved_names).not_to include('deprecated_parent', 'deprecated_grandparent')
-    end
-
     context "when nico tag already exists in tags" do
       before do
         Tag.find_undiscard_or_create_by!(
@@ -1000,26 +930,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(names).to include('spec_tag_2')
     end
 
-    it 'rejects a deprecated tag specified directly' do
-      Tag.create!(
-        name: 'deprecated_update_tag',
-        category: :general,
-        deprecated_at: Time.current
-      )
-      sign_in_as(member)
-
-      put "/posts/#{ post_record.id }", params: post_update_params(
-        post_record,
-        title: 'updated title',
-        tags: 'deprecated_update_tag'
-      )
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-        'tags' => ['廃止済みタグは付与できません．']
-      )
-    end
-
     context "when nico tag already exists in tags" do
       before do
         Tag.find_undiscard_or_create_by!(

backend/spec/requests/tag_versions_spec.rb

@@ -21,7 +21,6 @@ RSpec.describe 'TagVersions API', type: :request do
     event_type:,
     name:,
     category:,
-    deprecated_at: nil,
     aliases: [],
     parent_tags: [],
     created_by_user:,
@@ -34,7 +33,6 @@ RSpec.describe 'TagVersions API', type: :request do
             event_type: event_type,
             name: name,
             category: category,
-            deprecated_at: deprecated_at,
             aliases: Array(aliases).join(' '),
             parent_tag_ids: Array(parent_tags).map(&:id).join(' '),
             created_by_user: created_by_user,
@@ -67,7 +65,6 @@ RSpec.describe 'TagVersions API', type: :request do
       event_type: 'update',
       name: 'new_tag_name',
       category: 'meme',
-      deprecated_at: t_v2,
       aliases: ['alias_shared', 'alias_new'],
       parent_tags: [parent_shared, parent_new],
       created_by_user: member,
@@ -136,10 +133,6 @@ RSpec.describe 'TagVersions API', type: :request do
         'current' => 'meme',
         'prev' => 'general'
       )
-      expect(latest.fetch('deprecated_at')).to eq(
-        'current' => t_v2.iso8601,
-        'prev' => nil
-      )
       expect(latest.fetch('aliases')).to include(
         { 'name' => 'alias_shared', 'type' => 'context' },
         { 'name' => 'alias_new', 'type' => 'added' },
@@ -185,10 +178,6 @@ RSpec.describe 'TagVersions API', type: :request do
         'current' => 'general',
         'prev' => nil
       )
-      expect(first.fetch('deprecated_at')).to eq(
-        'current' => nil,
-        'prev' => nil
-      )
       expect(first.fetch('aliases')).to include(
         { 'name' => 'alias_shared', 'type' => 'added' },
         { 'name' => 'alias_old', 'type' => 'added' }

backend/spec/requests/tag_wiki_history_integrity_spec.rb

@@ -89,7 +89,6 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
           category: 'general',
           aliases: '',
           parent_tags: '',
-          deprecated: '0',
         }
       }
           .to change(TagVersion, :count).by(2)
@@ -124,7 +123,6 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
           category: 'meme',
           aliases: '',
           parent_tags: '',
-          deprecated: '0',
         }
       }
           .to change(TagVersion, :count).by(2)
@@ -151,7 +149,6 @@ RSpec.describe 'Tag and wiki history integrity', type: :request do
           category: 'general',
           aliases: 'put_tag_alias_only_alias',
           parent_tags: '',
-          deprecated: '0',
         }
       }
           .to change(TagVersion, :count).by(2)

backend/spec/requests/tags_spec.rb

@@ -76,27 +76,6 @@ RSpec.describe 'Tags API', type: :request do
       expect(response_tags.first['id']).to eq(meme.id)
     end
 
-    it 'filters tags by deprecated state' do
-      deprecated_tag = Tag.create!(
-        name: 'deprecated_filter',
-        category: :general,
-        deprecated_at: 1.day.from_now
-      )
-      active_tag = Tag.create!(name: 'active_filter', category: :general)
-
-      get '/tags', params: { name: '_filter', deprecated: '1' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to include(deprecated_tag.name)
-      expect(response_names).not_to include(active_tag.name)
-
-      get '/tags', params: { name: '_filter', deprecated: '0' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_names).to include(active_tag.name)
-      expect(response_names).not_to include(deprecated_tag.name)
-    end
-
     it 'filters tags by post_count range' do
       low = Tag.create!(tag_name: TagName.create!(name: 'pc_low'), category: :general)
       mid = Tag.create!(tag_name: TagName.create!(name: 'pc_mid'), category: :general)
@@ -322,21 +301,6 @@ RSpec.describe 'Tags API', type: :request do
       expect(t['matched_alias']).to eq('unko')
       expect(json.map { |x| x['name'] }).not_to include('unknown')
     end
-
-    it 'omits deprecated tags' do
-      deprecated_tag = Tag.create!(
-        name: 'spec_deprecated',
-        category: :general,
-        deprecated_at: Time.current
-      )
-      deprecated_tag.update_columns(post_count: 1)
-
-      get '/tags/autocomplete', params: { q: 'spec_', present: '0' }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { |item| item.fetch('name') }).to include('spec_tag')
-      expect(json.map { |item| item.fetch('name') }).not_to include('spec_deprecated')
-    end
   end
 
   describe 'GET /tags/name/:name' do
@@ -473,32 +437,6 @@ RSpec.describe 'Tags API', type: :request do
         expect(versions.second.created_by_user_id).to eq(member_user.id)
       end
 
-      it 'updates deprecated state and records it in tag versions' do
-        expect {
-          patch "/tags/#{ tag.id }", params: { deprecated: '1' }
-        }.to change(TagVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-        expect(tag.reload.deprecated_at).to be_present
-
-        versions = tag.tag_versions.order(:version_no)
-        expect(versions.first.deprecated_at).to be_nil
-        expect(versions.second.deprecated_at).to eq(tag.deprecated_at)
-        expect(json.fetch('deprecated_at')).to be_present
-      end
-
-      it 'rejects deprecating a nico tag' do
-        nico_tag = Tag.create!(name: 'nico:deprecated_update', category: :nico)
-
-        patch "/tags/#{ nico_tag.id }", params: { deprecated: '1' }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(nico_tag.reload.deprecated_at).to be_nil
-        expect(json.fetch('errors')).to include(
-          'deprecated' => ['ニコタグは廃止できません．']
-        )
-      end
-
       it 'returns 422 when changing normal tag category to nico' do
         expect {
           patch "/tags/#{tag.id}", params: { category: 'nico' }
@@ -647,111 +585,6 @@ RSpec.describe 'Tags API', type: :request do
       expect(row['has_children']).to eq(true)
       expect(row['children']).to eq([])
     end
-
-    it 'passes through deprecated tags when finding children' do
-      deprecated_middle = Tag.create!(
-        name: 'depth_deprecated_middle',
-        category: :character,
-        deprecated_at: Time.current
-      )
-      visible_descendant = Tag.create!(
-        name: 'depth_visible_descendant',
-        category: :material
-      )
-      TagImplication.create!(parent_tag: root_material, tag: deprecated_middle)
-      TagImplication.create!(parent_tag: deprecated_middle, tag: visible_descendant)
-
-      get '/tags/with-depth', params: { parent: root_material.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { |item| item.fetch('name') }).to eq(['depth_visible_descendant'])
-      expect(json.map { |item| item.fetch('name') }).not_to include('depth_deprecated_middle')
-    end
-
-    it 'passes through multiple deprecated tags for roots and has_children' do
-      active_child = Tag.create!(
-        name: 'depth_active_child_below_deprecated',
-        category: :character
-      )
-      deprecated_parent = Tag.create!(
-        name: 'depth_deprecated_parent',
-        category: :character,
-        deprecated_at: Time.current
-      )
-      deprecated_grandparent = Tag.create!(
-        name: 'depth_deprecated_grandparent',
-        category: :material,
-        deprecated_at: Time.current
-      )
-      active_ancestor = Tag.create!(
-        name: 'depth_active_ancestor',
-        category: :meme
-      )
-      TagImplication.create!(tag: active_child, parent_tag: deprecated_parent)
-      TagImplication.create!(tag: deprecated_parent, parent_tag: deprecated_grandparent)
-      TagImplication.create!(tag: deprecated_grandparent, parent_tag: active_ancestor)
-
-      get '/tags/with-depth'
-
-      root_names = json.map { |item| item.fetch('name') }
-      expect(root_names).to include('depth_active_ancestor')
-      expect(root_names).not_to include('depth_active_child_below_deprecated')
-      ancestor_json = json.find { |item| item.fetch('id') == active_ancestor.id }
-      expect(ancestor_json.fetch('has_children')).to eq(true)
-
-      get '/tags/with-depth', params: { parent: active_ancestor.id }
-
-      expect(json.map { |item| item.fetch('name') }).to include(
-        'depth_active_child_below_deprecated'
-      )
-      expect(json.map { |item| item.fetch('name') }).not_to include(
-        'depth_deprecated_parent',
-        'depth_deprecated_grandparent'
-      )
-    end
-
-    it 'treats an active tag with only deprecated ancestors as a root' do
-      active_child = Tag.create!(
-        name: 'depth_root_below_deprecated',
-        category: :character
-      )
-      deprecated_parent = Tag.create!(
-        name: 'depth_root_deprecated_parent',
-        category: :material,
-        deprecated_at: Time.current
-      )
-      TagImplication.create!(tag: active_child, parent_tag: deprecated_parent)
-
-      get '/tags/with-depth'
-
-      expect(json.map { |item| item.fetch('name') }).to include(
-        'depth_root_below_deprecated'
-      )
-      expect(json.map { |item| item.fetch('name') }).not_to include(
-        'depth_root_deprecated_parent'
-      )
-    end
-
-    it 'terminates when deprecated implications contain a cycle' do
-      first = Tag.create!(
-        name: 'depth_cycle_first',
-        category: :character,
-        deprecated_at: Time.current
-      )
-      second = Tag.create!(
-        name: 'depth_cycle_second',
-        category: :material,
-        deprecated_at: Time.current
-      )
-      TagImplication.create!(tag: first, parent_tag: root_material)
-      TagImplication.create!(tag: second, parent_tag: first)
-      TagImplication.create!(tag: first, parent_tag: second)
-
-      get '/tags/with-depth', params: { parent: root_material.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to eq([])
-    end
   end
 
   describe 'GET /tags/name/:name/materials' do
@@ -899,20 +732,6 @@ RSpec.describe 'Tags API', type: :request do
         expect(tag.category).to eq('general')
       end
 
-      it 'deprecated がなければ 422 を返す' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'new',
-          category: 'general',
-          aliases: '',
-          parent_tags: '',
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-          'deprecated' => ['廃止状態は必須です．']
-        )
-      end
-
       it 'name, category, aliases, parent tags をまとめて更新できる' do
         old_parent = Tag.create!(
           tag_name: TagName.create!(name: 'put_old_parent'),
@@ -930,7 +749,6 @@ RSpec.describe 'Tags API', type: :request do
           category: 'meme',
           aliases: 'put_alias_a put_alias_b put_alias_a',
           parent_tags: 'put_kept_parent put_new_parent',
-          deprecated: '0',
         }
 
         expect(response).to have_http_status(:ok)
@@ -975,7 +793,6 @@ RSpec.describe 'Tags API', type: :request do
           category: 'general',
           aliases: 'spec_tag put_alias_self_test',
           parent_tags: '',
-          deprecated: '0',
         }
 
         expect(response).to have_http_status(:ok)
@@ -993,7 +810,6 @@ RSpec.describe 'Tags API', type: :request do
           category: 'general',
           aliases: 'unko',
           parent_tags: 'spec_tag',
-          deprecated: '0',
         }
 
         expect(response).to have_http_status(:ok)
@@ -1009,7 +825,6 @@ RSpec.describe 'Tags API', type: :request do
             category: 'meta',
             aliases: '',
             parent_tags: '',
-            deprecated: '0',
           }
         }.to change(TagVersion, :count).by(2)
 
@@ -1045,7 +860,6 @@ RSpec.describe 'Tags API', type: :request do
           category: 'general',
           aliases: 'unko',
           parent_tags: new_parent.name,
-          deprecated: '0',
         }
 
         expect(response).to have_http_status(:ok)
@@ -1061,7 +875,6 @@ RSpec.describe 'Tags API', type: :request do
             category: 'nico',
             aliases: '',
             parent_tags: '',
-            deprecated: '0',
           }
         }.not_to change(TagVersion, :count)
 
@@ -1083,7 +896,6 @@ RSpec.describe 'Tags API', type: :request do
             category: 'nico',
             aliases: '',
             parent_tags: '',
-            deprecated: '0',
           }
         }.not_to change(NicoTagVersion, :count)
 
@@ -1104,7 +916,6 @@ RSpec.describe 'Tags API', type: :request do
             category: old_category,
             aliases: '',
             parent_tags: '',
-            deprecated: '0',
           }
         }.not_to change(TagVersion, :count)
 
@@ -1135,7 +946,6 @@ RSpec.describe 'Tags API', type: :request do
             category: 'meme',
             aliases: 'unko',
             parent_tags: '',
-            deprecated: '0',
           }
         }
             .to change(TagVersion, :count).by(2)
@@ -1171,7 +981,6 @@ RSpec.describe 'Tags API', type: :request do
             category: 'general',
             aliases: 'unko put_stolen_alias',
             parent_tags: '',
-            deprecated: '0',
           }
         }
             .to change { tag.reload.tag_versions.count }.by(2)
@@ -1206,7 +1015,6 @@ RSpec.describe 'Tags API', type: :request do
           category: 'general',
           aliases: 'unko',
           parent_tags: child.name,
-          deprecated: '0',
         }
 
         expect(response).to have_http_status(:unprocessable_entity)
@@ -1228,7 +1036,6 @@ RSpec.describe 'Tags API', type: :request do
             category: 'general',
             aliases: 'unko',
             parent_tags: '',
-            deprecated: '0',
           }
         }
             .to change(TagVersion, :count).by(2)

backend/spec/requests/wiki_spec.rb

@@ -18,13 +18,6 @@ RSpec.describe 'Wiki API', type: :request do
         created_by_user: user,
         message: 'init')
   end
-  let!(:tag) do
-    Tag.create!(
-      tag_name: tn,
-      category: :general,
-      deprecated_at: Time.zone.local(2026, 6, 1)
-    )
-  end
 
   describe 'GET /wiki' do
     it 'returns wiki pages with title' do
@@ -37,8 +30,6 @@ RSpec.describe 'Wiki API', type: :request do
 
       expect(json[0]).to have_key('title')
       expect(json.map { |p| p['title'] }).to include('spec_wiki_title')
-      wiki_json = json.find { |item| item.fetch('id') == page.id }
-      expect(wiki_json.fetch('deprecated_at')).to eq(tag.deprecated_at.iso8601(3))
     end
   end
 
@@ -57,8 +48,7 @@ RSpec.describe 'Wiki API', type: :request do
 
         expect(json).to include(
             'id' => page.id,
-            'title' => 'spec_wiki_title',
-            'deprecated_at' => tag.deprecated_at.iso8601(3))
+            'title' => 'spec_wiki_title')
       end
     end
 
@@ -419,11 +409,7 @@ RSpec.describe 'Wiki API', type: :request do
         'kind' => 'content',
         'message' => 'r2'
       )
-      expect(top['wiki_page']).to include(
-        'id' => page.id,
-        'title' => 'spec_wiki_title',
-        'deprecated_at' => tag.deprecated_at.iso8601(3)
-      )
+      expect(top['wiki_page']).to include('id' => page.id, 'title' => 'spec_wiki_title')
       expect(top['user']).to include('id' => user.id, 'name' => user.name)
       expect(top).to have_key('timestamp')
 
@@ -493,7 +479,6 @@ RSpec.describe 'Wiki API', type: :request do
       expect(json).to include(
         'wiki_page_id' => page.id,
         'title' => 'spec_wiki_title',
-        'deprecated_at' => tag.deprecated_at.iso8601(3),
         'older_revision_id' => rev_a.id,
         'newer_revision_id' => rev_b.id
       )

backend/spec/services/gekanator/question_suggestion_ai_converter_spec.rb

@@ -1,112 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Gekanator::QuestionSuggestionAiConverter do
-  let(:user) { create(:user, :member) }
-  let(:guessed_post) { Post.create!(title: 'guess', url: 'https://example.com/guess') }
-  let(:correct_post) { Post.create!(title: 'correct', url: 'https://example.com/correct') }
-  let(:game) do
-    GekanatorGame.create!(
-      user: user,
-      guessed_post: guessed_post,
-      correct_post: correct_post,
-      won: false,
-      question_count: 1,
-      answers: [{ 'question_id' => 'tag:1', 'answer' => 'yes' }]
-    )
-  end
-
-  def create_suggestion!(question_text:, answer: 'yes')
-    GekanatorQuestionSuggestion.create!(
-      gekanator_game: game,
-      user: user,
-      question_text: question_text,
-      answer: answer
-    )
-  end
-
-  it 'converts title-contains suggestions to pending ai-generated questions' do
-    suggestion = create_suggestion!(question_text: '題名に「結束バンド」が含まれる?')
-
-    expect {
-      described_class.call(suggestion: suggestion, user: user)
-    }.to change { GekanatorQuestion.count }.by(1)
-      .and change { GekanatorAiRun.count }.by(1)
-
-    question = GekanatorQuestion.last
-    expect(question).to have_attributes(
-      text: '題名に「結束バンド」が含まれる?',
-      kind: 'title',
-      source: 'ai_generated',
-      status: 'pending',
-      priority_weight: 0.95,
-      gekanator_question_suggestion_id: suggestion.id,
-      created_by_id: user.id
-    )
-    expect(question.condition).to include(
-      'type' => 'title-contains',
-      'text' => '結束バンド'
-    )
-    expect(GekanatorAiRun.last).to have_attributes(
-      gekanator_question_suggestion_id: suggestion.id,
-      model: 'heuristic_converter_v1',
-      status: 'succeeded'
-    )
-  end
-
-  it 'converts concrete non-unknown suggestions to post-similarity questions' do
-    suggestion = create_suggestion!(
-      question_text: '喜多ちゃんが泣いてる?',
-      answer: 'partial'
-    )
-
-    question = described_class.call(suggestion: suggestion, user: user)
-
-    expect(question).to have_attributes(
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'ai_generated',
-      status: 'pending',
-      priority_weight: 1.0
-    )
-    expect(question.condition).to include(
-      'type' => 'post-similarity',
-      'postId' => correct_post.id,
-      'answer' => 'partial',
-      'threshold' => 0.65
-    )
-  end
-
-  it 'records a failed run when the suggestion cannot be converted' do
-    suggestion = create_suggestion!(
-      question_text: 'よく分からない質問?',
-      answer: 'unknown'
-    )
-
-    expect {
-      expect(described_class.call(suggestion: suggestion, user: user)).to be_nil
-    }.not_to change { GekanatorQuestion.count }
-
-    expect(GekanatorAiRun.last).to have_attributes(
-      gekanator_question_suggestion_id: suggestion.id,
-      status: 'failed'
-    )
-  end
-
-  it 'returns an existing generated question without creating a duplicate run' do
-    suggestion = create_suggestion!(question_text: 'タイトルは 10 文字以上?')
-    existing = GekanatorQuestion.create!(
-      text: 'タイトルは 10 文字以上?',
-      kind: 'title',
-      source: 'ai_generated',
-      status: 'pending',
-      priority_weight: 0.95,
-      condition: { type: 'title-length-at-least', length: 10 },
-      gekanator_question_suggestion: suggestion,
-      created_by: user
-    )
-
-    expect {
-      expect(described_class.call(suggestion: suggestion, user: user)).to eq(existing)
-    }.not_to change { GekanatorAiRun.count }
-  end
-end

backend/spec/tasks/post_similarity_calc_spec.rb

@@ -4,12 +4,11 @@ require 'rails_helper'
 RSpec.describe 'post_similarity:calc' do
   include RakeTaskHelper
 
-  it 'calculates similarities from active tags only' do
+  it 'calls Similarity::Calc with Post and :tags' do
     # 必要最低限のデータ
     t1 = Tag.create!(name: "t1")
     t2 = Tag.create!(name: "t2")
     t3 = Tag.create!(name: "t3")
-    deprecated_tag = Tag.create!(name: 'deprecated', deprecated_at: Time.current)
 
     p1 = Post.create!(url: "https://example.com/1")
     p2 = Post.create!(url: "https://example.com/2")
@@ -23,8 +22,6 @@ RSpec.describe 'post_similarity:calc' do
     PostTag.create!(post: p2, tag: t3)
 
     PostTag.create!(post: p3, tag: t3)
-    PostTag.create!(post: p1, tag: deprecated_tag)
-    PostTag.create!(post: p2, tag: deprecated_tag)
 
     expect { run_rake_task("post_similarity:calc") }
       .to change { PostSimilarity.count }.from(0)
@@ -32,6 +29,6 @@ RSpec.describe 'post_similarity:calc' do
     ps = PostSimilarity.find_by!(post_id: p1.id, target_post_id: p2.id)
     ps_rev = PostSimilarity.find_by!(post_id: p2.id, target_post_id: p1.id)
     expect(ps_rev.cos).to eq(ps.cos)
-    expect(ps.cos).to be_within(0.0001).of(0.5)
   end
 end
+

backend/spec/tasks/tag_similarity_calc_spec.rb

@@ -4,12 +4,11 @@ require 'rails_helper'
 RSpec.describe 'tag_similarity:calc' do
   include RakeTaskHelper
 
-  it 'calculates similarities for active tags only' do
+  it 'calls Similarity::Calc with Tag and :posts' do
     # 必要最低限のデータ
     t1 = Tag.create!(name: "t1")
     t2 = Tag.create!(name: "t2")
     t3 = Tag.create!(name: "t3")
-    deprecated_tag = Tag.create!(name: 'deprecated', deprecated_at: Time.current)
 
     p1 = Post.create!(url: "https://example.com/1")
     p2 = Post.create!(url: "https://example.com/2")
@@ -23,7 +22,6 @@ RSpec.describe 'tag_similarity:calc' do
     PostTag.create!(post: p2, tag: t3)
 
     PostTag.create!(post: p3, tag: t3)
-    PostTag.create!(post: p1, tag: deprecated_tag)
 
     expect { run_rake_task("tag_similarity:calc") }
       .to change { TagSimilarity.count }.from(0)
@@ -31,7 +29,6 @@ RSpec.describe 'tag_similarity:calc' do
     ps = TagSimilarity.find_by!(tag_id: t1.id, target_tag_id: t2.id)
     ps_rev = TagSimilarity.find_by!(tag_id: t2.id, target_tag_id: t1.id)
     expect(ps_rev.cos).to eq(ps.cos)
-    expect(TagSimilarity.where(tag_id: deprecated_tag.id)).to be_empty
-    expect(TagSimilarity.where(target_tag_id: deprecated_tag.id)).to be_empty
   end
 end
+

frontend/AGENTS.md

@@ -33,10 +33,6 @@ 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`,

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'
@@ -69,7 +68,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/materials" element={<MaterialBasePage/>}>
 	    <Route index element={<MaterialListPage/>}/>
 	    <Route path="new" element={<MaterialNewPage/>}/>
-	    <Route path=":id" element ={<MaterialDetailPage user={user}/>}/>
+	    <Route path=":id" element ={<MaterialDetailPage/>}/>
 	  </Route>
 	  {/* <Route path="/materials/search" element={<MaterialSearchPage/>}/> */}
 	  <Route path="/wiki" element={<WikiSearchPage/>}/>
@@ -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

@@ -129,9 +129,7 @@ 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 (() => {
@@ -204,9 +202,6 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
 
       if (data.eventName === 'playerMetadataChange')
 	{
-	  if (Number.isFinite (data.data.duration) && data.data.duration > 0)
-	    clearLoadCompleteTimer ()
-
 	  onMetadataChange?.(data.data)
 	  return
 	}

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 { useCallback, useEffect, useState } from 'react'
 import YoutubeEmbed from 'react-youtube'
 
 import NicoViewer from '@/components/NicoViewer'
@@ -36,17 +36,6 @@ const PostEmbed: FC<Props> = ({
   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 ()
@@ -91,20 +80,15 @@ const PostEmbed: FC<Props> = ({
   }
 
   const handleNiconicoLoadComplete = (info: NiconicoVideoInfo) => {
-    notifyNiconicoVideoReady (info.lengthInSeconds * 1_000)
+    onVideoReady?.(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

frontend/src/components/TagLink.test.tsx

@@ -18,21 +18,6 @@ describe ('TagLink', () => {
     expect (screen.getByText ('4')).toBeInTheDocument ()
   })
 
-  it ('does not append deprecated state to the rendered tag name', () => {
-    renderWithProviders (
-        <TagLink
-            tag={buildTag ({
-                name:         '旧タグ',
-                deprecatedAt: '2026-06-01T00:00:00.000Z',
-            })}
-            withWiki={false}
-            withCount={false}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: '旧タグ' })).toBeInTheDocument ()
-    expect (screen.queryByText ('（廃止）')).not.toBeInTheDocument ()
-  })
-
   it ('links wiki markers to the correct detail route', () => {
     renderWithProviders (
         <TagLink tag={buildTag ({ hasWiki: true, name: 'a/b' })}/>,

frontend/src/components/TopNav.tsx

@@ -66,8 +66,7 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	  { 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: '上映会 (β)', to: '/theatres/1' },
-	  { name: 'グカネータ (β)', 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 },

frontend/src/lib/gekanator.test.ts

@@ -1,523 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { apiGet, apiPost } from '@/lib/api'
-import {
-  buildGekanatorQuestions,
-  expectedAnswerForQuestion,
-  fetchGekanatorPosts,
-  fetchGekanatorQuestions,
-  learnedSemanticSideForPost,
-  questionIdForCondition,
-  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 mockedApiGet = vi.mocked(apiGet)
-
-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('Gekanator API functions', () => {
-  it('returns posts from the Gekanator posts endpoint', async () => {
-    const posts = [post()]
-    mockedApiGet.mockResolvedValueOnce({ posts })
-
-    await expect(fetchGekanatorPosts()).resolves.toEqual(posts)
-    expect(mockedApiGet).toHaveBeenCalledWith('/gekanator/posts')
-  })
-
-  it('returns questions from the Gekanator questions endpoint', async () => {
-    const questions: StoredGekanatorQuestion[] = []
-    mockedApiGet.mockResolvedValueOnce({ questions })
-
-    await expect(fetchGekanatorQuestions()).resolves.toEqual(questions)
-    expect(mockedApiGet).toHaveBeenCalledWith('/gekanator/questions')
-  })
-})
-
-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',
-              deprecatedAt: null,
-              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')
-  })
-
-  it('returns yes for matching title-contains questions', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'title:contains:結束バンド',
-      text: '題名に「結束バンド」が含まれる?',
-      kind: 'title',
-      condition: {
-        type: 'title-contains',
-        text: '結束バンド',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(
-      question,
-      post({ title: '結束バンドのライブ' }),
-    )).toBe('yes')
-    expect(expectedAnswerForQuestion(
-      question,
-      post({ title: '後藤ひとりの休日' }),
-    )).toBe('no')
-  })
-})
-
-describe('learnedSemanticSideForPost', () => {
-  it('classifies post_similarity examples as positive, negative, or unknown', () => {
-    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: 'partial',
-        threshold: 0.65,
-      },
-      exampleAnswers: {
-        1: 'yes',
-        2: 'probably_no',
-      },
-    }
-
-    expect(learnedSemanticSideForPost(question, post({ id: 1 }))).toBe('positive')
-    expect(learnedSemanticSideForPost(question, post({ id: 2 }))).toBe('negative')
-    expect(learnedSemanticSideForPost(question, post({ id: 3 }))).toBe('unknown')
-    expect(learnedSemanticSideForPost(question, post({ id: 123 }))).toBe('positive')
-  })
-})
-
-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(true)
-  })
-
-  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)
-  })
-
-  it('restores title-contains questions with a title matcher', () => {
-    const question = restoreGekanatorQuestion({
-      id: 'title:contains:結束バンド',
-      text: '題名に「結束バンド」が含まれる?',
-      kind: 'title',
-      condition: {
-        type: 'title-contains',
-        text: '結束バンド',
-      },
-    })
-
-    expect(question.test(post({ title: '結束バンドのライブ' }))).toBe(true)
-    expect(question.test(post({ title: '後藤ひとりの休日' }))).toBe(false)
-  })
-})
-
-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\?$/)
-    expect(titleQuestion?.id).toMatch(/^title:length-at-least:\d+$/)
-  })
-
-  it('builds title-contains questions from repeated title words', () => {
-    const questions = buildGekanatorQuestions([
-      post({ id: 1, title: '結束バンド ライブ' }),
-      post({ id: 2, title: '結束バンド 新曲' }),
-      post({ id: 3, title: '後藤ひとり 練習' }),
-      post({ id: 4, title: '伊地知虹夏 練習' }),
-    ])
-
-    const titleContainsQuestion = questions.find(question =>
-      question.condition.type === 'title-contains'
-      && question.condition.text === '結束バンド')
-
-    expect(titleContainsQuestion).toMatchObject({
-      id: 'title:contains:結束バンド',
-      text: '題名に「結束バンド」が含まれる?',
-      kind: 'title',
-      source: 'default',
-      priorityWeight: .96,
-    })
-    expect(titleContainsQuestion?.test(post({ title: '結束バンドのライブ' }))).toBe(true)
-    expect(titleContainsQuestion?.test(post({ title: '廣井きくりのライブ' }))).toBe(false)
-  })
-
-  it('honors question caps and title-contains toggles', () => {
-    const posts = [
-      post({ id: 1, title: '結束バンド ライブ' }),
-      post({ id: 2, title: '結束バンド 新曲' }),
-      post({ id: 3, title: '後藤ひとり 練習' }),
-      post({ id: 4, title: '伊地知虹夏 練習' }),
-    ]
-
-    const capped = buildGekanatorQuestions(posts, {
-      titleContainsCap: 1,
-      totalQuestionCap: 1,
-    })
-    const withoutTitleContains = buildGekanatorQuestions(posts, {
-      includeTitleContains: false,
-    })
-
-    expect(capped).toHaveLength(1)
-    expect(withoutTitleContains.some(question =>
-      question.condition.type === 'title-contains')).toBe(false)
-  })
-})
-
-describe('questionIdForCondition', () => {
-  it('builds stable ids for title-contains questions', () => {
-    expect(questionIdForCondition({
-      type: 'title-contains',
-      text: '結束バンド',
-    })).toBe('title:contains:結束バンド')
-  })
-})
-
-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',
-        },
-        questionMode: 'normal',
-        questionPurpose: 'effective_user_suggested',
-        effectiveQuestion: true,
-        learningQuestion: false,
-        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',
-          },
-          question_mode: 'normal',
-          question_purpose: 'effective_user_suggested',
-          effective_question: true,
-          learning_question: false,
-          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

@@ -1,675 +0,0 @@
-import { apiGet, apiPost } from '@/lib/api'
-
-import type { Post } from '@/types'
-
-export type GekanatorAnswerValue =
-    | 'yes'
-    | 'no'
-    | 'partial'
-    | 'probably_no'
-    | 'unknown'
-
-export type LearnedSemanticSide =
-    | 'positive'
-    | 'negative'
-    | 'unknown'
-
-export type GekanatorQuestionPurpose =
-    | 'effective_user_suggested'
-    | 'learning_user_suggested'
-    | 'normal'
-
-export type GekanatorAnswerLog = {
-    questionId:       string
-    questionText:     string
-    questionCondition?:  GekanatorQuestionCondition
-    questionMode?:    'normal' | 'winning_run'
-    questionPurpose?: GekanatorQuestionPurpose
-    effectiveQuestion?: boolean
-    learningQuestion?: boolean
-    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 = '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 = {
-    recordId?:       number
-    id:              string
-    text:            string
-    kind:            GekanatorQuestionKind
-    condition:       GekanatorQuestionCondition
-    source?:         GekanatorQuestionSource
-    priorityWeight?: number
-    exampleAnswers?: Record<`${ number }`, GekanatorAnswerValue> }
-
-export type GekanatorQuestion = {
-    recordId?:       number
-    id:              string
-    text:            string
-    kind:            GekanatorQuestionKind
-    condition:       GekanatorQuestionCondition
-    source:          GekanatorQuestionSource
-    priorityWeight:  number
-    exampleAnswers?: Record<`${ 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:${ condition.text }`
-  }
-}
-
-
-const directExampleAnswerFor = (
-    question:  StoredGekanatorQuestion,
-    post:      Post,
-): GekanatorAnswerValue | null => {
-  if (question.kind !== 'post_similarity' && question.kind !== 'tag')
-    return null
-
-  const direct = question.exampleAnswers?.[String (post.id) as `${ number }`]
-  if (direct)
-    return direct
-
-  if (question.condition.type === 'post-similarity' && question.condition.postId === post.id)
-    return question.condition.answer
-
-  return null
-}
-
-
-export const isLearnedSemanticQuestion = (
-    question:  StoredGekanatorQuestion | GekanatorQuestion,
-): boolean =>
-    question.kind === 'post_similarity'
-    && question.source === 'user_suggested'
-
-
-export const learnedSemanticSideForAnswer = (
-    answer:  GekanatorAnswerValue | null,
-): LearnedSemanticSide => {
-  if (answer === 'yes' || answer === 'partial')
-    return 'positive'
-
-  if (answer === 'no' || answer === 'probably_no')
-    return 'negative'
-
-  return 'unknown'
-}
-
-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.kind === 'post_similarity'
-	? learnedSemanticSideForAnswer (directAnswer) === 'positive'
-	: 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 'post-similarity':
-    if (question.condition.postId === post.id)
-      return question.condition.answer
-
-    return null
-  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'
-  }
-}
-
-
-export const learnedSemanticSideForPost = (
-    question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
-): LearnedSemanticSide =>
-    learnedSemanticSideForAnswer (expectedAnswerForQuestion (question, post))
-
-
-export const restoreGekanatorQuestion = (
-    question:  StoredGekanatorQuestion,
-): GekanatorQuestion => {
-  const normalizedCondition = normalizeTitleLengthCondition (question.condition)
-  const normalizedQuestion = {
-      ...question,
-      recordId: question.recordId,
-      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,
-  recordId: question.recordId,
-  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; learnedExampleCount: 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,
-	    question_mode: answer.questionMode,
-	    question_purpose: answer.questionPurpose,
-	    effective_question: answer.effectiveQuestion,
-	    learning_question: answer.learningQuestion,
-	    answer: answer.answer,
-	    original_answer: answer.originalAnswer })) })
-
-
-export const saveGekanatorQuestionSuggestion = async ({
-    gekanatorGameId,
-    existingQuestionId,
-    questionText,
-    answer,
-}: {
-    gekanatorGameId:  number
-    existingQuestionId?: number
-    questionText?:    string
-    answer:           GekanatorAnswerValue
-}): Promise<{ id: number; count: number }> =>
-    await apiPost ('/gekanator/question_suggestions', {
-	gekanator_game_id: gekanatorGameId,
-	existing_question_id: existingQuestionId,
-	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

@@ -1,259 +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 { RecoveredCandidateState } from '@/lib/gekanatorCandidateRecovery'
-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 sourceQuestion = (
-    host:  string,
-): GekanatorQuestion => ({
-  id: `source:${ host }`,
-  text: `${ host }?`,
-  kind: 'source',
-  condition: {
-      type: 'source',
-      host },
-  source: 'default',
-  priorityWeight: 1,
-  test: candidate => new URL (candidate.url).hostname === host,
-})
-
-
-const answer = (
-    question:  GekanatorQuestion,
-    value:     GekanatorAnswerValue,
-): GekanatorAnswerLog => ({
-  questionId: question.id,
-  questionText: question.text,
-  questionCondition: question.condition,
-  answer: value,
-  originalAnswer: value,
-})
-
-
-const recoveredState = (
-    answerCountAtRecovery:  number,
-    scoreAtRecovery = 0,
-): RecoveredCandidateState => ({
-  answerCountAtRecovery,
-  scoreAtRecovery,
-})
-
-
-describe('candidatePostsFor', () => {
-  it('does not hard-filter semantic post_similarity 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, recoveredState (1)],
-	    [3, recoveredState (1)],
-	]) })
-
-    expect(candidates.map (candidate => candidate.id)).toEqual ([1, 2, 3])
-  })
-
-  it('lets recovered candidates ignore old fact answers but not later fact answers', () => {
-    const posts = [
-	{ ...post (1), url: 'https://other.example/posts/1' },
-	post (2),
-	{ ...post (3), url: 'https://example.com/posts/3' },
-    ]
-    const oldQuestion = sourceQuestion ('old.example.com')
-    const laterQuestion = sourceQuestion ('example.com')
-
-    const candidates = candidatePostsFor ({
-	posts,
-	questions: [oldQuestion, laterQuestion],
-	answers: [answer (oldQuestion, 'yes'), answer (laterQuestion, 'yes')],
-	softenedQuestionIds: new Set (),
-	rejectedPostIds: new Set (),
-	recoveredCandidatePosts: new Map ([
-	    [1, recoveredState (1)],
-	    [3, recoveredState (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, recoveredState (1)]]) })
-
-    expect(candidates.map (candidate => candidate.id)).toEqual ([2])
-  })
-})
-
-
-describe('hardFilteredPostsForAnswer', () => {
-  it('keeps the original pool for semantic post_similarity answers', () => {
-    const posts = [post (1), post (2)]
-    const question = postSimilarityQuestion ('question', {
-	1: 'yes',
-	2: 'yes',
-    })
-
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'no',
-    })).toEqual (posts)
-  })
-
-  it('hard-filters fact answers only for yes and no', () => {
-    const posts = [
-	{ ...post (1), url: 'https://example.com/posts/1' },
-	{ ...post (2), url: 'https://other.example/posts/2' },
-    ]
-    const question = sourceQuestion ('example.com')
-
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'yes',
-    }).map (candidate => candidate.id)).toEqual ([1])
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'no',
-    }).map (candidate => candidate.id)).toEqual ([2])
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'partial',
-    })).toEqual (posts)
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'probably_no',
-    })).toEqual (posts)
-    expect(hardFilteredPostsForAnswer ({
-	posts,
-	question,
-	answer: 'unknown',
-    })).toEqual (posts)
-  })
-})
-
-
-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, recoveredState (1, 8)]]),
-	eligiblePostIds: new Set ([9]),
-	answerCountAtRecovery: 2,
-	recoveryStepCount: 0,
-    })
-
-    expect(recovered?.recoveryStepCount).toBe (1)
-    expect([...(recovered?.recoveredCandidatePosts.keys () ?? [])])
-      .toEqual ([8, 7, 6, 5, 4])
-    expect(recovered?.recoveredCandidatePosts.get (7)).toEqual ({
-	answerCountAtRecovery: 2,
-	scoreAtRecovery: 7,
-    })
-  })
-
-  it('does not add posts when recovered and eligible candidates already hit the target', () => {
-    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 (),
-	recoveredCandidatePosts: new Map ([
-	    [1, recoveredState (1, 1)],
-	    [2, recoveredState (1, 2)],
-	    [3, recoveredState (1, 3)],
-	]),
-	eligiblePostIds: new Set ([4, 5, 6]),
-	answerCountAtRecovery: 2,
-	recoveryStepCount: 0,
-    })
-
-    expect(recovered?.recoveryStepCount).toBe (1)
-    expect([...(recovered?.recoveredCandidatePosts.keys () ?? [])])
-      .toEqual ([1, 2, 3])
-  })
-})

frontend/src/lib/gekanatorCandidateRecovery.ts

@@ -1,159 +0,0 @@
-import { isLearnedSemanticQuestion,
-	 learnedSemanticSideForPost } from '@/lib/gekanator'
-
-import type { GekanatorAnswerLog, GekanatorAnswerValue, GekanatorQuestion } from '@/lib/gekanator'
-import type { Post } from '@/types'
-
-export type RecoveredCandidatePost = {
-    postId:                number
-    answerCountAtRecovery: number
-    scoreAtRecovery:       number }
-
-export type RecoveredCandidateState = {
-    answerCountAtRecovery: number
-    scoreAtRecovery:       number }
-
-
-const questionSupportsAnswerBasedHardFiltering = (question:  GekanatorQuestion): boolean =>
-    !(isLearnedSemanticQuestion (question)
-      || (question.kind === 'tag'
-	  && question.condition.type === 'tag'
-	  && !(question.condition.key.startsWith ('nico:'))))
-
-
-export const candidatePostsFor = (
-    { posts,
-      questions,
-      answers,
-      softenedQuestionIds,
-      rejectedPostIds,
-      recoveredCandidatePosts }: { posts:                   Post[]
-				   questions:               GekanatorQuestion[]
-				   answers:                 GekanatorAnswerLog[]
-				   softenedQuestionIds:     Set<string>
-				   rejectedPostIds:         Set<number>
-				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> },
-): Post[] => {
-  const questionById = new Map (questions.map (question => [question.id, question]))
-
-  return posts.filter (post => {
-    if (rejectedPostIds.has (post.id))
-      return false
-
-    const recoveredCandidate = recoveredCandidatePosts.get (post.id)
-
-    return answers.every ((answer, index) => {
-      if (recoveredCandidate != null && index < recoveredCandidate.answerCountAtRecovery)
-	return true
-
-      if (softenedQuestionIds.has (answer.questionId))
-	return true
-
-      const question = questionById.get (answer.questionId)
-      if (!(question))
-	return true
-      if (!(questionSupportsAnswerBasedHardFiltering (question)))
-	return true
-
-      switch (answer.answer)
-      {
-      case 'yes':
-      case 'no':
-	{
-	  const expected = learnedSemanticSideForPost (question, post)
-	  return expected === 'unknown'
-	      || (answer.answer === 'yes' && expected === 'positive')
-	      || (answer.answer === 'no' && expected === 'negative')
-	}
-      default:
-	return true
-      }
-    })
-  })
-}
-
-
-export const hardFilteredPostsForAnswer = (
-    { posts, question, answer }: { posts:     Post[]
-				   question:  GekanatorQuestion
-				   answer:    GekanatorAnswerValue },
-): Post[] => {
-  if (!(questionSupportsAnswerBasedHardFiltering (question)))
-    return posts
-
-  if (!(answer === 'yes' || answer === 'no'))
-    return posts
-
-  return posts.filter (post => {
-    const side = learnedSemanticSideForPost (question, post)
-    return side === 'unknown'
-	|| (answer === 'yes' && side === 'positive')
-	|| (answer === 'no' && side === 'negative')
-  })
-}
-
-
-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, RecoveredCandidateState>
-			     eligiblePostIds:         Set<number>
-			     answerCountAtRecovery:   number
-			     recoveryStepCount:       number },
-): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
-     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,
-      scoreAtRecovery: scores.get (post.id) ?? 0 }))
-
-  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/prefetchers.ts

@@ -17,10 +17,6 @@ const mWiki = match<{ title: string }> ('/wiki/:title')
 const mTag = match<{ id: string }> ('/tags/:id')
 
 
-const boolFromQuery = (value: string | null): boolean =>
-    ['1', 'true', 'on', 'yes', ''].includes ((value ?? '').toLowerCase ())
-
-
 const prefetchWikiPagesIndex: Prefetcher = async (qc, url) => {
   const title = url.searchParams.get ('title') ?? ''
 
@@ -160,16 +156,13 @@ const prefetchTagsIndex: Prefetcher = async (qc, url) => {
   const createdTo = url.searchParams.get ('created_to') ?? ''
   const updatedFrom = url.searchParams.get ('updated_from') ?? ''
   const updatedTo = url.searchParams.get ('updated_to') ?? ''
-  const deprecated = url.searchParams.has ('deprecated')
-      ? boolFromQuery (url.searchParams.get ('deprecated'))
-      : null
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
   const order = (url.searchParams.get ('order') ?? 'post_count:desc') as FetchTagsOrder
 
   const keys = {
       post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
-      updatedFrom, updatedTo, deprecated, page, limit, order }
+      updatedFrom, updatedTo, page, limit, order }
 
   await qc.prefetchQuery ({
       queryKey: tagsKeys.index (keys),

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/tags.test.ts

@@ -20,7 +20,6 @@ const baseParams: FetchTagsParams = {
   createdTo:    '',
   updatedFrom:  '',
   updatedTo:    '',
-  deprecated:   null,
   page:         1,
   limit:        30,
   order:        'updated_at:desc',
@@ -58,20 +57,6 @@ describe ('tags API functions', () => {
     )
   })
 
-  it.each ([
-    [true, '1'],
-    [false, '0'],
-  ] as const) ('maps deprecated=%s to %s', async (deprecated, expected) => {
-    api.apiGet.mockResolvedValueOnce ({ tags: [], count: 0 })
-
-    await fetchTags ({ ...baseParams, deprecated })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/tags',
-        { params: expect.objectContaining ({ deprecated: expected }) },
-    )
-  })
-
   it ('returns null when tag fetches fail', async () => {
     api.apiGet.mockRejectedValueOnce (new Error ('missing'))
     api.apiGet.mockRejectedValueOnce (new Error ('missing'))

frontend/src/lib/tags.ts

@@ -10,8 +10,7 @@ import type { Deerjikist,
 
 export const fetchTags = async (
     { post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
-      updatedFrom, updatedTo, deprecated,
-      page, limit, order }: FetchTagsParams,
+      updatedFrom, updatedTo, page, limit, order }: FetchTagsParams,
 ): Promise<{ tags:  Tag[]
 	     count: number }> =>
     await apiGet ('/tags', { params: {
@@ -24,7 +23,6 @@ export const fetchTags = async (
 	...(createdTo && { created_to: createdTo }),
 	...(updatedFrom && { updated_from: updatedFrom }),
 	...(updatedTo && { updated_to: updatedTo }),
-	...(deprecated != null && { deprecated: deprecated ? '1' : '0' }),
 	...(page && { page }),
 	...(limit && { limit }),
 	...(order && { order }) } })
@@ -66,6 +64,7 @@ export const fetchTagByName = async (name: string): Promise<Tag | null> => {
   }
 }
 
+
 export const fetchTagChanges = async (
     { id, page, limit }: {
 	id?:    string

frontend/src/pages/GekanatorPage.test.tsx

@@ -1,240 +0,0 @@
-import { readFileSync } from 'node:fs'
-import { resolve } from 'node:path'
-
-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)])
-
-
-const gekanatorPageSource = readFileSync (
-    resolve (process.cwd (), 'src/pages/GekanatorPage.tsx'),
-    'utf8')
-
-const gekanatorBackdropSource = gekanatorPageSource.slice (
-    gekanatorPageSource.indexOf ('const GekanatorBackdrop'),
-    gekanatorPageSource.indexOf ('const expectedAnswerFor'))
-
-const gekanatorChooseQuestionSource = gekanatorPageSource.slice (
-    gekanatorPageSource.indexOf ('const chooseQuestion'),
-    gekanatorPageSource.indexOf ('const winningRunPriorityFor'))
-
-const gekanatorFallbackQuestionSource = gekanatorPageSource.slice (
-    gekanatorPageSource.indexOf ('const chooseFallbackQuestion'),
-    gekanatorPageSource.indexOf ('const shouldEnterGuessPhase'))
-
-
-describe('GekanatorBackdrop regression structure', () => {
-  it('keeps displayedBackdropMode as the render-time source of truth', () => {
-    expect(gekanatorBackdropSource).not.toContain ('isLeavingGuessBackdrop')
-    expect(gekanatorBackdropSource).not.toContain ('renderBackdropMode')
-    expect(gekanatorBackdropSource).not.toContain ('renderWinningRunCount')
-    expect(gekanatorBackdropSource).not.toContain ('renderThumbnails')
-    expect(gekanatorBackdropSource).not.toContain ('renderIsCrossfading')
-
-    expect(gekanatorBackdropSource).toContain (
-      "const renderedSettings = settingsForMode (displayedBackdropMode)")
-    expect(gekanatorBackdropSource).toContain (
-      'scaleForMode (displayedBackdropMode, displayedWinningRunCount)')
-    expect(gekanatorBackdropSource).toContain (
-      "backdropMode === 'guess' || displayedBackdropMode === 'guess'")
-  })
-
-  it('does not split guess into a separate renderer or force a remount', () => {
-    expect(gekanatorBackdropSource).not.toContain ('renderStaticGuessBackdrop')
-    expect(gekanatorBackdropSource).not.toContain ('guessZoomAnimationKey')
-    expect(gekanatorBackdropSource).not.toContain ('shouldAnimateGuessZoomIn')
-    expect(gekanatorBackdropSource).not.toContain ('previousBackdropModeRef')
-    expect(gekanatorBackdropSource).not.toContain (
-      'if (isGuessPresentation && guessThumbnail)')
-  })
-
-  it('keeps tile keys independent from backdrop mode', () => {
-    expect(gekanatorBackdropSource).toContain ('key={duplicate}')
-    expect(gekanatorBackdropSource).toContain ('key={`${ duplicate }:${ index }`}')
-    expect(gekanatorBackdropSource).not.toMatch (/key=\{`\$\{\s*mode/)
-    expect(gekanatorBackdropSource).not.toMatch (/key=\{`\$\{\s*displayedBackdropMode/)
-  })
-
-  it('keeps guess on the shared scale, x, and y animation path', () => {
-    expect(gekanatorBackdropSource).toContain ('animate={{ scale: renderedScale')
-    expect(gekanatorBackdropSource).toContain (
-      "x: displayedBackdropMode === 'guess' ? guessFocusOffset.x : '0%'")
-    expect(gekanatorBackdropSource).toContain (
-      "y: displayedBackdropMode === 'guess' ? guessFocusOffset.y : '0%'")
-  })
-})
-
-
-describe('Gekanator question selection regression structure', () => {
-  it('prefers normal questions after user_suggested quota has been met', () => {
-    const normalFallbackIndex = gekanatorChooseQuestionSource.indexOf (
-      'else if (normalPool.length > 0)')
-    const effectiveFallbackIndex = gekanatorChooseQuestionSource.indexOf (
-      'else if (effectiveUserSuggestedPool.length > 0)')
-
-    expect(normalFallbackIndex).toBeGreaterThan(0)
-    expect(effectiveFallbackIndex).toBeGreaterThan(0)
-    expect(normalFallbackIndex).toBeLessThan(effectiveFallbackIndex)
-  })
-
-  it('does not let fallback questions bypass user_suggested purpose tracking', () => {
-    expect(gekanatorFallbackQuestionSource).toContain (
-      "question.source !== 'user_suggested'")
-  })
-
-  it('does not show a fixed extra-question count in the extra learning UI', () => {
-    expect(gekanatorPageSource).not.toContain ('追加で 2 問まで答えてください。')
-    expect(gekanatorPageSource).toContain ('追加で質問に答えてください。')
-  })
-})
-
-
-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/materials/MaterialDetailPage.test.tsx

@@ -8,7 +8,6 @@ import { renderWithProviders } from '@/test/render'
 
 const api = vi.hoisted (() => ({
   apiGet: vi.fn (),
-  apiPatch: vi.fn (),
   apiPut: vi.fn (),
 }))
 
@@ -27,7 +26,7 @@ vi.mock ('@/components/ui/use-toast', () => toastApi)
 const renderPage = () =>
   renderWithProviders (
       <Routes>
-        <Route path="/materials/:id" element={<MaterialDetailPage user={null}/>}/>
+        <Route path="/materials/:id" element={<MaterialDetailPage/>}/>
       </Routes>,
       { route: '/materials/8' },
   )
@@ -74,7 +73,6 @@ describe ('MaterialDetailPage', () => {
     const textboxes = screen.getAllByRole ('textbox')
     fireEvent.change (textboxes[0], { target: { value: 'new' } })
     fireEvent.change (textboxes[1], { target: { value: 'https://example.com/ref' } })
-    fireEvent.change (textboxes[2], { target: { value: '素材/new.png' } })
     fireEvent.click (screen.getByRole ('button', { name: '更新' }))
 
     await waitFor (() => {
@@ -83,7 +81,6 @@ describe ('MaterialDetailPage', () => {
     const formData = api.apiPut.mock.calls[0]?.[1] as FormData
     expect (formData.get ('tag')).toBe ('new')
     expect (formData.get ('url')).toBe ('https://example.com/ref')
-    expect (formData.get ('export_paths[legacy_drive]')).toBe ('素材/new.png')
     expect (toastApi.toast).toHaveBeenCalledWith ({ title: '更新成功!' })
   })
 })

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -13,23 +13,22 @@ import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import { apiGet, apiPatch, apiPut } from '@/lib/api'
+import { apiGet, apiPut } from '@/lib/api'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC } from 'react'
 
-import type { Material, Tag, User } from '@/types'
+import type { Material, Tag } from '@/types'
 
 type MaterialWithTag = Material & { tag: Tag }
 
-type MaterialFormField = 'tag' | 'file' | 'url' | 'exportPaths'
+type MaterialFormField = 'tag' | 'file' | 'url'
 
 
-const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
+const MaterialDetailPage: FC = () => {
   const { id } = useParams ()
 
-  const [exportPath, setExportPath] = useState ('')
   const [file, setFile] = useState<File | null> (null)
   const [filePreview, setFilePreview] = useState ('')
   const [loading, setLoading] = useState (false)
@@ -50,7 +49,6 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
       formData.append ('file', file)
     if (url.trim ())
       formData.append ('url', url)
-    formData.append ('export_paths[legacy_drive]', exportPath)
 
     try
     {
@@ -70,30 +68,6 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
     }
   }
 
-  const handleSuppress = async () => {
-    const reason = window.prompt ('抑止理由を入力してください。')
-    if (reason == null || reason.trim () === '')
-      return
-    if (!window.confirm ('素材ファイルを抑止します。表示と ZIP export から除外されます。'))
-      return
-
-    try
-    {
-      const data = await apiPatch<Material> (
-	  `/materials/${ id }/suppress_file`,
-	  { reason },
-      )
-      setMaterial (data)
-      setFile (null)
-      setFilePreview ('')
-      toast ({ title: '抑止しました' })
-    }
-    catch
-    {
-      toast ({ title: '抑止に失敗しました' })
-    }
-  }
-
   useEffect (() => {
     if (!(id))
       return
@@ -108,10 +82,11 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
 	if (data.file && data.contentType)
 	  {
 	    setFilePreview (data.file)
-	    setFile (null)
+	    setFile (new File ([await (await fetch (data.file)).blob ()],
+			       data.file,
+			       { type: data.contentType }))
 	  }
 	setURL (data.url ?? '')
-	setExportPath (data.exportPaths.legacyDrive ?? '')
       }
       finally
       {
@@ -136,14 +111,7 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
 		    withCount={false}/>
 	      </PageTitle>
 
-	      {material.fileSuppressedAt && (
-		  <div className="mb-4 rounded border border-red-300 bg-red-50 p-3 text-red-700">
-		    <span>素材ファイルは抑止済みです。</span>
-		    {material.fileSuppressionReason && (
-			<span> 理由: {material.fileSuppressionReason}</span>)}
-		  </div>)}
-
-	      {(!material.fileSuppressedAt && material.file && material.contentType) && (
+	      {(material.file && material.contentType) && (
 		  (/image\/.*/.test (material.contentType) && (
 		      <img src={material.file} alt={material.tag.name || undefined}/>))
 		  || (/video\/.*/.test (material.contentType) && (
@@ -221,36 +189,13 @@ const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
 			      className={inputClass (invalid)}/>)}
 		    </FormField>
 
-		    <FormField
-			label="ZIP 出力パス"
-			messages={fieldErrors.exportPaths}>
-		      {({ describedBy, invalid }) => (
-			  <input
-			      type="text"
-			      value={exportPath}
-			      onChange={e => setExportPath (e.target.value)}
-			      placeholder="伊地知ニジカ/表情/泣き.png"
-			      aria-describedby={describedBy}
-			      aria-invalid={invalid}
-			      className={inputClass (invalid)}/>)}
-		    </FormField>
-
 		    {/* 送信 */}
-		    <div className="flex flex-wrap gap-2">
 		    <Button
 			onClick={handleSubmit}
 			className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
 			disabled={sending}>
 		      更新
 		    </Button>
-		      {user?.role === 'admin' && !material.fileSuppressedAt && (
-			  <Button
-			      type="button"
-			      variant="destructive"
-			      onClick={handleSuppress}>
-			    ファイルを抑止
-			  </Button>)}
-		    </div>
 		  </div>
 		</Tab>
 	      </TabGroup>

frontend/src/pages/materials/MaterialListPage.tsx

@@ -9,7 +9,7 @@ import PageTitle from '@/components/common/PageTitle'
 import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
 import { apiGet } from '@/lib/api'
 
 import type { FC } from 'react'
@@ -30,15 +30,10 @@ const MaterialCard = ({ tag }: { tag: TagWithMaterial }) => {
 	  to={`/materials/${ tag.material.id }`}
 	  className="block w-40 h-40">
 	<div
-	    className={`w-full h-full overflow-hidden rounded-xl shadow
-			text-center content-center text-4xl ${
-			tag.material.fileSuppressedAt
-			? 'border-2 border-red-300 bg-red-50 text-base text-red-700'
-			: '' }`}
+	    className="w-full h-full overflow-hidden rounded-xl shadow
+		       text-center content-center text-4xl"
 	    style={{ fontFamily: 'Nikumaru' }}>
-	  {tag.material.fileSuppressedAt
-	   ? <span>抑止済み</span>
-	   : (tag.material.contentType && /image\/.*/.test (tag.material.contentType))
+	  {(tag.material.contentType && /image\/.*/.test (tag.material.contentType))
 	   ? <img src={tag.material.file || undefined}/>
 	   : <span>照会</span>}
 	</div>
@@ -113,7 +108,7 @@ const MaterialListPage: FC = () => {
 
 		  <MaterialCard tag={tag}/>
 
-		  <div className="ml-2 overflow-x-auto pb-2">
+		  <div className="ml-2">
 		    {tag.children.map (c2 => (
 			<Fragment key={c2.id}>
 			  <SectionTitle>
@@ -164,11 +159,7 @@ const MaterialListPage: FC = () => {
 		  <p>もしくは……</p>
 		  <ul>
 		    <li><PrefetchLink to="/materials/new">素材を新規追加する</PrefetchLink></li>
-		    <li>
-		      <a href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}>
-			すべての素材をダウンロードする
-		      </a>
-		    </li>
+		    {/* <li><a href="#">すべての素材をダウンロードする</a></li> */}
 		  </ul>
 		</>))}
       </MainArea>)

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -17,7 +17,7 @@ import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC } from 'react'
 
-type MaterialFormField = 'tag' | 'file' | 'url' | 'exportPaths'
+type MaterialFormField = 'tag' | 'file' | 'url'
 
 
 const MaterialNewPage: FC = () => {
@@ -32,7 +32,6 @@ const MaterialNewPage: FC = () => {
   const [sending, setSending] = useState (false)
   const [tag, setTag] = useState (tagQuery)
   const [url, setURL] = useState ('')
-  const [exportPath, setExportPath] = useState ('')
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<MaterialFormField> ()
 
@@ -46,7 +45,6 @@ const MaterialNewPage: FC = () => {
       formData.append ('file', file)
     if (url)
       formData.append ('url', url)
-    formData.append ('export_paths[legacy_drive]', exportPath)
 
     try
     {
@@ -135,20 +133,6 @@ const MaterialNewPage: FC = () => {
 		    className={inputClass (invalid)}/>)}
 	  </FormField>
 
-	  <FormField
-	      label="ZIP 出力パス"
-	      messages={fieldErrors.exportPaths}>
-	    {({ describedBy, invalid }) => (
-		<input
-		    type="text"
-		    value={exportPath}
-		    onChange={e => setExportPath (e.target.value)}
-		    placeholder="伊地知ニジカ/表情/泣き.png"
-		    aria-describedby={describedBy}
-		    aria-invalid={invalid}
-		    className={inputClass (invalid)}/>)}
-	  </FormField>
-
 	  {/* 送信 */}
 	  <Button
 	      onClick={handleSubmit}

frontend/src/pages/tags/TagDetailPage.tsx

@@ -19,12 +19,7 @@ import type { FC, FormEvent } from 'react'
 
 import type { Category, Tag } from '@/types'
 
-type TagFormField =
-    | 'name'
-    | 'category'
-    | 'aliases'
-    | 'parentTags'
-    | 'deprecated'
+type TagFormField = 'name' | 'category' | 'aliases' | 'parentTags'
 
 
 const TagDetailPage: FC = () => {
@@ -40,7 +35,6 @@ const TagDetailPage: FC = () => {
   const [category, setCategory] = useState<Category> ('general')
   const [aliases, setAliases] = useState ('')
   const [parentTags, setParentTags] = useState ('')
-  const [deprecated, setDeprecated] = useState (false)
   const [disabled, setDisabled] = useState (true)
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<TagFormField> ()
@@ -56,7 +50,6 @@ const TagDetailPage: FC = () => {
     formData.append ('category', category)
     formData.append ('aliases', aliases)
     formData.append ('parent_tags', parentTags)
-    formData.append ('deprecated', deprecated ? '1' : '0')
 
     try
     {
@@ -66,7 +59,6 @@ const TagDetailPage: FC = () => {
       setCategory (data.category as Category)
       setAliases (data.aliases.join (' '))
       setParentTags (data.parents.map (t => t.name).join (' '))
-      setDeprecated (Boolean (data.deprecatedAt))
 
       qc.invalidateQueries ({ queryKey: postsKeys.root })
       qc.invalidateQueries ({ queryKey: tagsKeys.root })
@@ -90,7 +82,6 @@ const TagDetailPage: FC = () => {
     setCategory (tag.category as Category)
     setAliases (tag.aliases.join (' '))
     setParentTags (tag.parents.map (t => t.name).join (' '))
-    setDeprecated (Boolean (tag.deprecatedAt))
     setDisabled (tag.category === 'nico')
   }, [tag])
 
@@ -174,17 +165,6 @@ const TagDetailPage: FC = () => {
 		      </>)}
 		</FormField>
 
-		<FormField label="廃止済" messages={fieldErrors.deprecated}>
-		  {({ describedBy, invalid }) => (
-		      <input
-			  type="checkbox"
-			  disabled={disabled}
-			  checked={deprecated}
-			  onChange={e => setDeprecated (e.target.checked)}
-			  aria-describedby={describedBy}
-			  aria-invalid={invalid}/>)}
-		</FormField>
-
 		<div className="py-3">
 		  <button
 		      type="submit"

frontend/src/pages/tags/TagHistoryPage.tsx

@@ -20,26 +20,15 @@ import type { FC } from 'react'
 
 const renderDiff = (diff: { current: string | null; prev: string | null }) => (
     <>
-      {diff.prev !== diff.current
-       ? (
+      {(diff.prev && diff.prev !== diff.current) && (
 	  <>
 	    <del className="text-red-600 dark:text-red-400">
-	      {diff.prev && <>{diff.prev}<br/></>}
+	      {diff.prev}
 	    </del>
-	    <ins className="text-green-600 dark:text-green-400">
+	    {diff.current && <br/>}
+	  </>)}
       {diff.current}
-	    </ins>
     </>)
-       : diff.current}
-    </>)
-
-
-const tagStateLabel = (deprecatedAt: string | null) => deprecatedAt ? '廃止' : ''
-
-
-const renderStateDiff = (diff: { current: string | null; prev: string | null }) =>
-    renderDiff ({ current: tagStateLabel (diff.current),
-		  prev: tagStateLabel (diff.prev) })
 
 
 const TagHistoryPage: FC = () => {
@@ -83,8 +72,6 @@ const TagHistoryPage: FC = () => {
 		    <col className="w-96"/>
 		    {/* カテゴリ */}
 		    <col className="w-96"/>
-		    {/* 状態 */}
-		    <col className="w-32"/>
 		    {/* 別名 */}
 		    <col className="w-[48rem]"/>
 		    {/* 上位タグ */}
@@ -100,7 +87,6 @@ const TagHistoryPage: FC = () => {
 		      <th className="p-2 text-left">版</th>
 		      <th className="p-2 text-left">名称</th>
 		      <th className="p-2 text-left">カテゴリ</th>
-		      <th className="p-2 text-left">状態</th>
 		      <th className="p-2 text-left">別名</th>
 		      <th className="p-2 text-left">上位タグ</th>
 		      <th className="p-2 text-left">更新日時</th>
@@ -120,9 +106,6 @@ const TagHistoryPage: FC = () => {
 				prev: (change.category.prev
 				       && CATEGORY_NAMES[change.category.prev]) })}
 			  </td>
-			  <td className="p-2 break-all">
-			    {renderStateDiff (change.deprecatedAt)}
-			  </td>
 			  <td className="p-2">
 			    {change.aliases.map ((tag, i) => (
 				tag.type === 'added'
@@ -195,7 +178,6 @@ const TagHistoryPage: FC = () => {
 					`/tags/${ change.tagId }`,
 					{ name: change.name.current,
 					  category: change.category.current,
-					  deprecated: change.deprecatedAt.current ? '1' : '0',
 					  aliases:
 					      change.aliases
 					      .filter (t => t.type !== 'removed')
@@ -229,5 +211,4 @@ const TagHistoryPage: FC = () => {
       </MainArea>)
 }
 
-
 export default TagHistoryPage

frontend/src/pages/tags/TagListPage.test.tsx

@@ -14,22 +14,13 @@ vi.mock ('@/lib/tags', () => tagsApi)
 describe ('TagListPage', () => {
   it ('loads tags from URL filters and renders the results table', async () => {
     tagsApi.fetchTags.mockResolvedValueOnce ({
-      tags: [buildTag ({
-        id: 7,
-        name: '虹夏',
-        category: 'character',
-        postCount: 99,
-        deprecatedAt: '2026-06-01T00:00:00.000Z',
-      })],
+      tags: [buildTag ({ id: 7, name: '虹夏', category: 'character', postCount: 99 })],
       count: 1,
     })
 
     renderWithProviders (
         <TagListPage/>,
-        {
-          route:
-              '/tags?name=%E8%99%B9&category=character&page=3&post_count_gte=5&deprecated=1',
-        },
+        { route: '/tags?name=%E8%99%B9&category=character&page=3&post_count_gte=5' },
     )
 
     await waitFor (() => {
@@ -39,7 +30,6 @@ describe ('TagListPage', () => {
             category:     'character',
             page:         3,
             postCountGTE: 5,
-            deprecated:   true,
           }),
       )
     })
@@ -48,8 +38,6 @@ describe ('TagListPage', () => {
         '/tags/7',
     )
     expect (screen.getAllByText ('キャラクター').length).toBeGreaterThan (0)
-    expect (screen.getAllByRole ('combobox')[1]).toHaveValue ('1')
-    expect (screen.getAllByText ('廃止')).toHaveLength (2)
   })
 
   it ('navigates to a normalized search URL on submit', async () => {
@@ -58,9 +46,7 @@ describe ('TagListPage', () => {
     renderWithProviders (<TagListPage/>, { route: '/tags' })
 
     fireEvent.change (screen.getByRole ('textbox'), { target: { value: '虹夏' } })
-    fireEvent.change (screen.getAllByRole ('combobox')[0], {
-      target: { value: 'character' },
-    })
+    fireEvent.change (screen.getByRole ('combobox'), { target: { value: 'character' } })
     fireEvent.submit (screen.getByRole ('button', { name: '検索' }).closest ('form')!)
 
     await waitFor (() => {

frontend/src/pages/tags/TagListPage.tsx

@@ -29,13 +29,6 @@ const setIf = (qs: URLSearchParams, k: string, v: string | null) => {
 }
 
 
-const boolFromQuery = (value: string | null): boolean =>
-    ['1', 'true', 'on', 'yes', ''].includes ((value ?? '').toLowerCase ())
-
-
-const tagStateLabel = (deprecatedAt: string | null) => deprecatedAt ? '廃止' : ''
-
-
 const TagListPage: FC = () => {
   const location = useLocation ()
 
@@ -55,9 +48,6 @@ const TagListPage: FC = () => {
   const qCreatedTo = query.get ('created_to') ?? ''
   const qUpdatedFrom = query.get ('updated_from') ?? ''
   const qUpdatedTo = query.get ('updated_to') ?? ''
-  const qDeprecated = query.has ('deprecated')
-      ? boolFromQuery (query.get ('deprecated'))
-      : null
   const order = (query.get ('order') || 'post_count:desc') as FetchTagsOrder
 
   const [name, setName] = useState ('')
@@ -68,7 +58,6 @@ const TagListPage: FC = () => {
   const [createdTo, setCreatedTo] = useState<string | null> (null)
   const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
   const [updatedTo, setUpdatedTo] = useState<string | null> (null)
-  const [deprecated, setDeprecated] = useState<boolean | null> (null)
 
   const keys = {
       page, limit, order,
@@ -80,8 +69,7 @@ const TagListPage: FC = () => {
       createdFrom: qCreatedFrom,
       createdTo: qCreatedTo,
       updatedFrom: qUpdatedFrom,
-      updatedTo: qUpdatedTo,
-      deprecated: qDeprecated }
+      updatedTo: qUpdatedTo }
   const { data, isLoading: loading } = useQuery ({
       queryKey: tagsKeys.index (keys),
       queryFn: () => fetchTags (keys) })
@@ -97,11 +85,10 @@ const TagListPage: FC = () => {
     setCreatedTo (qCreatedTo)
     setUpdatedFrom (qUpdatedFrom)
     setUpdatedTo (qUpdatedTo)
-    setDeprecated (qDeprecated)
 
     document.querySelector ('table')?.scrollIntoView ({ behavior: 'smooth' })
   }, [location.search, qCategory, qCreatedFrom, qCreatedTo, qName, qPostCountGTE,
-      qPostCountLTE, qUpdatedFrom, qUpdatedTo, qDeprecated])
+      qPostCountLTE, qUpdatedFrom, qUpdatedTo])
 
   const handleSearch = (e: FormEvent) => {
     e.preventDefault ()
@@ -117,8 +104,6 @@ const TagListPage: FC = () => {
     setIf (qs, 'created_to', createdTo)
     setIf (qs, 'updated_from', updatedFrom)
     setIf (qs, 'updated_to', updatedTo)
-    if (deprecated != null)
-      qs.set ('deprecated', deprecated ? '1' : '0')
     qs.set ('page', '1')
     qs.set ('order', order)
 
@@ -216,21 +201,6 @@ const TagListPage: FC = () => {
 		  </>)}
 	    </FormField>
 
-	    <FormField label="状態">
-	      {({ invalid }) => (
-		  <select
-		      value={deprecated == null ? '' : (deprecated ? '1' : '0')}
-		      onChange={e => setDeprecated (
-			  e.target.value === ''
-			  ? null
-			  : e.target.value === '1')}
-		      className={inputClass (invalid)}>
-		    <option value="">&nbsp;</option>
-		    <option value="0">有効</option>
-		    <option value="1">廃止</option>
-		  </select>)}
-	    </FormField>
-
 	    <div className="py-3">
 	      <button
 		  type="submit"
@@ -249,7 +219,6 @@ const TagListPage: FC = () => {
 		    <col className="w-72"/>
 		    <col className="w-16"/>
 		    <col className="w-48"/>
-		    <col className="w-32"/>
 		    <col className="w-72"/>
 		    <col className="w-48"/>
 		    <col className="w-56"/>
@@ -280,7 +249,6 @@ const TagListPage: FC = () => {
 			    currentOrder={order}
 			    defaultDirection={defaultDirection}/>
 		      </th>
-		      <th className="p-2 text-left whitespace-nowrap">状態</th>
 		      <th className="p-2 text-left whitespace-nowrap">別名</th>
 		      <th className="p-2 text-left whitespace-nowrap">上位タグ</th>
 		      <th className="p-2 text-left whitespace-nowrap">
@@ -312,7 +280,6 @@ const TagListPage: FC = () => {
 			  </td>
 			  <td className="p-2 text-right">{row.postCount}</td>
 			  <td className="p-2">{CATEGORY_NAMES[row.category]}</td>
-			  <td className="p-2">{tagStateLabel (row.deprecatedAt)}</td>
 			  <td className="p-2">{row.aliases.join (' ')}</td>
 			  <td className="p-2">
 			    {row.parents.map (t => (