#41

AGENTS.md

@@ -125,64 +125,6 @@ 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
@@ -216,13 +158,6 @@ 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
 
@@ -244,9 +179,6 @@ 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:
 

backend/app/controllers/gekanator_games_controller.rb

@@ -1,6 +1,6 @@
 class GekanatorGamesController < ApplicationController
   def create
-    return head :unauthorized unless current_user
+    return head :not_found unless current_user&.admin?
 
     guessed_post_id = params.require(:guessed_post_id)
     correct_post_id = params[:correct_post_id].presence
@@ -14,259 +14,10 @@ class GekanatorGamesController < ApplicationController
         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}"
+    if game.save
+      render json: { id: game.id }, status: :created
     else
-      "catalog:#{question.id}"
+      render json: { errors: game.errors.full_messages }, status: :unprocessable_entity
     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

@@ -1,50 +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'))
-
-    render json: { posts: posts.map { |post| post_json(post) } }
-  end
-
-  private
-
-  def post_json post
-    {
-      id: post.id,
-      url: post.url,
-      title: post.title,
-      thumbnail: thumbnail_url(post),
-      thumbnail_base: post.thumbnail_base,
-      original_created_from: post.original_created_from,
-      original_created_before: post.original_created_before,
-      post_similarity_edges: post.post_similarities.map { |similarity|
-        {
-          target_post_id: similarity.target_post_id,
-          cos: similarity.cos.to_f
-        }
-      },
-      tags: post.tags.map { |tag| tag_json(tag) }
-    }
-  end
-
-  def tag_json tag
-    {
-      id: tag.id,
-      name: tag.name,
-      category: tag.category
-    }
-  end
-
-  def thumbnail_url post
-    return nil unless post.thumbnail.attached?
-
-    rails_storage_proxy_url(post.thumbnail, only_path: false)
-  rescue
-    nil
-  end
-end

backend/app/controllers/gekanator_question_suggestions_controller.rb

@@ -1,95 +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

@@ -1,103 +0,0 @@
-class GekanatorQuestionsController < ApplicationController
-  def index
-    questions =
-        GekanatorQuestion
-        .accepted
-        .includes(:gekanator_question_examples)
-        .order(priority_weight: :desc, id: :asc)
-
-    render json: {
-      questions: questions.map { |question| question_json(question) }
-    }
-  end
-
-  private
-
-  def question_json question
-    condition = condition_json(question.condition).deep_symbolize_keys
-    json = {
-      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
-end

backend/app/models/gekanator_ai_run.rb

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

backend/app/models/gekanator_game.rb

@@ -2,12 +2,6 @@ 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 }

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/post.rb

@@ -19,9 +19,8 @@ class Post < ApplicationRecord
   has_many :gekanator_correct_games,
            class_name: 'GekanatorGame',
            foreign_key: :correct_post_id,
-           dependent: :delete_all,
+           dependent: :nullify,
            inverse_of: :correct_post
-  has_many :gekanator_question_examples, dependent: :delete_all
 
   has_many :parent_post_implications,
            class_name: 'PostImplication',

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/config/routes.rb

@@ -64,21 +64,7 @@ Rails.application.routes.draw do
   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
+    resources :games, only: [:create], controller: '/gekanator_games'
   end
 
   resources :users, only: [:create, :update] do

backend/db/migrate/20260608000000_create_gekanator_question_suggestions.rb

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

backend/db/migrate/20260608002000_add_answer_to_gekanator_question_suggestions.rb

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

backend/db/migrate/20260609000000_create_gekanator_questions.rb

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

backend/db/migrate/20260609001000_create_gekanator_ai_runs.rb

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

backend/db/migrate/20260610000000_create_gekanator_question_examples.rb

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

backend/db/migrate/20260612000000_add_answer_statistics_to_gekanator_question_examples.rb

@@ -1,40 +0,0 @@
-class AddAnswerStatisticsToGekanatorQuestionExamples < ActiveRecord::Migration[8.0]
-  class MigrationGekanatorQuestionExample < ApplicationRecord
-    self.table_name = 'gekanator_question_examples'
-  end
-
-  def up
-    add_column :gekanator_question_examples,
-               :answer_counts,
-               :json,
-               null: true
-    add_column :gekanator_question_examples,
-               :sample_count,
-               :integer,
-               null: false,
-               default: 1
-
-    MigrationGekanatorQuestionExample.reset_column_information
-    MigrationGekanatorQuestionExample.find_each do |example|
-      counts = {
-        'yes' => 0,
-        'no' => 0,
-        'partial' => 0,
-        'probably_no' => 0,
-        'unknown' => 0
-      }
-      counts[example.answer] = 1 if counts.key?(example.answer)
-
-      example.update_columns(
-        answer_counts: counts,
-        sample_count: 1)
-    end
-
-    change_column_null :gekanator_question_examples, :answer_counts, false
-  end
-
-  def down
-    remove_column :gekanator_question_examples, :sample_count
-    remove_column :gekanator_question_examples, :answer_counts
-  end
-end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_06_07_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
@@ -48,18 +48,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
     t.index ["tag_id"], name: "index_deerjikists_on_tag_id"
   end
 
-  create_table "gekanator_ai_runs", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "model", null: false
-    t.integer "input_tokens", default: 0, null: false
-    t.integer "output_tokens", default: 0, null: false
-    t.decimal "estimated_cost_jpy", precision: 8, scale: 3, default: "0.0", null: false
-    t.string "status", default: "pending", null: false
-    t.bigint "gekanator_question_suggestion_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["gekanator_question_suggestion_id"], name: "index_gekanator_ai_runs_on_gekanator_question_suggestion_id"
-  end
-
   create_table "gekanator_games", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "user_id", null: false
     t.bigint "guessed_post_id", null: false
@@ -75,52 +63,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
     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"
@@ -551,18 +493,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_12_000000) do
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
-  add_foreign_key "gekanator_ai_runs", "gekanator_question_suggestions"
   add_foreign_key "gekanator_games", "posts", column: "correct_post_id"
   add_foreign_key "gekanator_games", "posts", column: "guessed_post_id"
   add_foreign_key "gekanator_games", "users"
-  add_foreign_key "gekanator_question_examples", "gekanator_games"
-  add_foreign_key "gekanator_question_examples", "gekanator_questions"
-  add_foreign_key "gekanator_question_examples", "posts"
-  add_foreign_key "gekanator_question_examples", "users"
-  add_foreign_key "gekanator_question_suggestions", "gekanator_games", on_delete: :cascade
-  add_foreign_key "gekanator_question_suggestions", "users"
-  add_foreign_key "gekanator_questions", "gekanator_question_suggestions"
-  add_foreign_key "gekanator_questions", "users", column: "created_by_id"
   add_foreign_key "material_versions", "materials"
   add_foreign_key "material_versions", "materials", column: "parent_id"
   add_foreign_key "material_versions", "tags"

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/requests/gekanator_games_spec.rb

@@ -52,16 +52,16 @@ RSpec.describe 'Gekanator games API', type: :request do
       expect(response).to have_http_status(:unprocessable_entity)
     end
 
-    it 'returns unauthorized without a user' do
+    it 'returns not found without an admin user' do
       post '/gekanator/games', params: {
           guessed_post_id: guessed_post.id,
           correct_post_id: guessed_post.id,
           answers: [] }
 
-      expect(response).to have_http_status(:unauthorized)
+      expect(response).to have_http_status(:not_found)
     end
 
-    it 'stores a game for a non-admin user' do
+    it 'returns not found for a non-admin user' do
       sign_in_as user
 
       post '/gekanator/games', params: {
@@ -69,8 +69,7 @@ RSpec.describe 'Gekanator games API', type: :request do
           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)
+      expect(response).to have_http_status(:not_found)
     end
   end
 end

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

frontend/src/App.tsx

@@ -40,7 +40,7 @@ import WikiHistoryPage from '@/pages/wiki/WikiHistoryPage'
 import WikiNewPage from '@/pages/wiki/WikiNewPage'
 import WikiSearchPage from '@/pages/wiki/WikiSearchPage'
 
-import type { Dispatch, FC, SetStateAction } from 'react'
+import type { Dispatch, FC, ReactNode, SetStateAction } from 'react'
 
 import type { User } from '@/types'
 
@@ -81,7 +81,10 @@ 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="/gekanator" element={
+	      <AdminOnly user={user}>
+		<GekanatorPage/>
+	      </AdminOnly>}/>
 	  <Route path="/more" element={<MorePage/>}/>
 	  <Route path="*" element={<NotFound/>}/>
 	</Routes>
@@ -89,6 +92,16 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 }
 
 
+const AdminOnly = ({ user, children }: {
+    user:      User | null
+    children:  ReactNode }) => {
+  if (user?.role !== 'admin')
+    return <NotFound/>
+
+  return <>{children}</>
+}
+
+
 const PostDetailRoute = ({ user }: { user: User | null }) => {
   const location = useLocation ()
   const key = location.pathname

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

@@ -1,501 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { apiPost } from '@/lib/api'
-import {
-  buildGekanatorQuestions,
-  expectedAnswerForQuestion,
-  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 post = (overrides: Partial<Post> = {}): Post => ({
-  id: 1,
-  versionNo: 1,
-  url: 'https://example.com/posts/1',
-  title: 'post title',
-  thumbnail: null,
-  thumbnailBase: null,
-  tags: [],
-  viewed: false,
-  related: [],
-  originalCreatedFrom: null,
-  originalCreatedBefore: null,
-  createdAt: '2026-06-10T00:00:00.000Z',
-  updatedAt: '2026-06-10T00:00:00.000Z',
-  uploadedUser: null,
-  ...overrides,
-})
-
-describe('expectedAnswerForQuestion', () => {
-  it('returns a direct example answer when present', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 999,
-        answer: 'yes',
-        threshold: 0.65,
-      },
-      exampleAnswers: {
-        1: 'partial',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 1 }))).toBe('partial')
-  })
-
-  it('returns the condition answer for the original post_similarity post', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 123,
-        answer: 'probably_no',
-        threshold: 0.65,
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 123 }))).toBe('probably_no')
-  })
-
-  it('returns null for an unrelated post_similarity post without examples', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'post-similarity:10',
-      text: '喜多ちゃんが泣いてる?',
-      kind: 'post_similarity',
-      source: 'user_suggested',
-      priorityWeight: 1.2,
-      condition: {
-        type: 'post-similarity',
-        postId: 123,
-        answer: 'yes',
-        threshold: 0.65,
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 456 }))).toBeNull()
-  })
-
-  it('returns yes for a matching tag question', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'tag:character:喜多郁代',
-      text: '喜多ちゃんが関係してる?',
-      kind: 'tag',
-      condition: {
-        type: 'tag',
-        key: 'character:喜多郁代',
-      },
-    }
-
-    expect(
-      expectedAnswerForQuestion(
-        question,
-        post({
-          tags: [
-            {
-              id: 1,
-              name: '喜多郁代',
-              category: 'character',
-              aliases: [],
-              parents: [],
-              postCount: 1,
-              createdAt: '2026-06-10T00:00:00.000Z',
-              updatedAt: '2026-06-10T00:00:00.000Z',
-              hasWiki: false,
-              hasDeerjikists: false,
-              materialId: null,
-            },
-          ],
-        }),
-      ),
-    ).toBe('yes')
-  })
-
-  it('returns no for a non-matching tag question', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'tag:character:喜多郁代',
-      text: '喜多ちゃんが関係してる?',
-      kind: 'tag',
-      condition: {
-        type: 'tag',
-        key: 'character:喜多郁代',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ tags: [] }))).toBe('no')
-  })
-
-  it('ignores example answers for direct title facts', () => {
-    const question: StoredGekanatorQuestion = {
-      id: 'title:length-at-least:20',
-      text: 'タイトルは 20 文字以上?',
-      kind: 'title',
-      condition: {
-        type: 'title-length-at-least',
-        length: 20,
-      },
-      exampleAnswers: {
-        1: 'yes',
-      },
-    }
-
-    expect(expectedAnswerForQuestion(question, post({ id: 1, title: 'short' }))).toBe('no')
-  })
-
-  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

@@ -1,4 +1,5 @@
-import { apiGet, apiPost } from '@/lib/api'
+import { apiPost } from '@/lib/api'
+import { fetchPosts } from '@/lib/posts'
 
 import type { Post } from '@/types'
 
@@ -9,192 +10,22 @@ export type GekanatorAnswerValue =
     | '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 }
+    questionId:    string
+    questionText:  string
+    answer:        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'
-}
+    id:    string
+    text:  string
+    kind:  GekanatorQuestionKind
+    test:  (post: Post) => boolean }
 
 const countBy = <T extends string | number> (values: T[]): Map<T, number> => {
   const counts = new Map<T, number> ()
@@ -234,37 +65,6 @@ const originalYearOf = (post: Post): number | null => {
 }
 
 
-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 }`
 
@@ -278,27 +78,6 @@ const tagFromQuestionKey = (key: string): { category: string; name: string } =>
 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)
 
@@ -312,149 +91,31 @@ const questionableTag = (post: Post, key: string): boolean => {
 }
 
 
-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
+  const limit = 200
+  const first = await fetchPosts ({
+      url: '', title: '', tags: '', match: 'all',
+      originalCreatedFrom: '', originalCreatedTo: '',
+      createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
+      page: 1, limit, order: 'original_created_at:desc' })
+  const posts = [...first.posts]
+  const totalPages = Math.ceil (first.count / limit)
+
+  for (let page = 2; page <= totalPages; page++)
+    {
+      const data = await fetchPosts ({
+	  url: '', title: '', tags: '', match: 'all',
+	  originalCreatedFrom: '', originalCreatedTo: '',
+	  createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
+	  page, limit, order: 'original_created_at:desc' })
+      posts.push (...data.posts)
+    }
+
+  return 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
+export const buildGekanatorQuestions = (posts: Post[]): GekanatorQuestion[] => {
   const tagCounts = countBy (posts.flatMap (post =>
       post.tags
       .filter (tag =>
@@ -466,157 +127,72 @@ export const buildGekanatorQuestions = (
   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))
+      .filter ((year): year is number => year !== 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,
-  ) =>
+  const usefulEntries = <T extends string | number> (counts: Map<T, 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)
+      .slice (0, 80)
 
-  const tagQuestions = usefulEntries (tagCounts, Math.max (tagQuestionCap, 80))
+  const tagQuestions = usefulEntries (tagCounts)
       .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
-      .slice (0, tagQuestionCap)
+      .slice (0, 80)
       .map (([key]) => {
 	const { category, name } = tagFromQuestionKey (String (key))
 	const label = category === 'nico' ? nicoTagLabel (name) : name
 
 	return {
 	    id:   `tag:${ key }`,
-	    text: tagQuestionText (category, label),
+	    text: category === 'nico'
+		? `ニコニコに「${ label }」といふタグが付いてゐる?`
+		: `内容として「${ label }」に関係しさう?`,
 	    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)
+  const sourceQuestions = usefulEntries (hosts)
       .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)
+  const originalYearQuestions = usefulEntries (originalYears)
       .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 ${ titleLengthMedian } 文字以上?`,
+	  id:   'title:long',
+	  text: '題名が長めの投稿?',
 	  kind: 'title' as const,
-	  condition: {
-	      type: 'title-length-at-least' as const,
-	      length: titleLengthMedian },
-	  source: 'default' as const,
-	  priorityWeight: 1,
-	  test: (post: Post) => (post.title?.length ?? 0) >= titleLengthMedian },
+	  test: (post: Post) => (post.title?.length ?? 0) > titleLengthMedian },
       {
 	  id:   'title:ascii',
 	  text: '題名に英数字が混じってゐる?',
 	  kind: 'title' as const,
-	  condition: { type: 'title-has-ascii' as const },
-	  source: 'default' as const,
-	  priorityWeight: 1,
 	  test: (post: Post) => /[A-Za-z0-9]/.test (post.title ?? '') }]
       .filter (question => {
 	const yes = posts.filter (post => question.test (post)).length
 	const no = posts.length - yes
 	return yes >= 2 && no >= 2 && yes <= posts.length * .7 && no <= posts.length * .7
       })
-  const titleContainsQuestions =
-      includeTitleContains
-	? usefulEntries (titleWordCounts, titleContainsCap)
-	    .filter (([word, count]) =>
-		String (word).length <= 24
-		&& count >= 2
-		&& count <= Math.max (2, posts.length * .7))
-	    .slice (0, titleContainsCap)
-	    .map (([word]) => ({
-		id:   `title:contains:${ 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)
+      ...tagQuestions]
 }
 
 
@@ -628,48 +204,11 @@ export const saveGekanatorGame = async ({
     guessedPostId:  number
     correctPostId:  number
     answers:        GekanatorAnswerLog[]
-}): Promise<{ id: number; learnedExampleCount: number }> =>
+}): Promise<{ id: number }> =>
     await apiPost ('/gekanator/games', {
 	guessed_post_id: guessedPostId,
 	correct_post_id: correctPostId,
 	answers: answers.map (answer => ({
 	    question_id: answer.questionId,
 	    question_text: answer.questionText,
-	    question_condition: answer.questionCondition ?? null,
-	    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 })) })
+	    answer: answer.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/queryKeys.ts

@@ -9,11 +9,8 @@ export const postsKeys = {
 		  ['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 }
+    root:   ['gekanator'] as const,
+    posts:  () => ['gekanator', 'posts'] as const }
 
 export const tagsKeys = {
     root:         ['tags'] as const,

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/types.ts

@@ -139,10 +139,6 @@ export type Post = {
     title:                  string | null
     thumbnail:              string | null
     thumbnailBase:          string | null
-    postSimilarityEdges?:   {
-			      targetPostId: number
-			      cos:          number
-			  }[]
     tags:                   Tag[]
     parentPosts?:           Post[]
     childPosts?:            Post[]