#306

AGENTS.md

@@ -132,6 +132,10 @@ npm run preview
 - 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 breaking a line at an operator, break before the
+  operator and put the operator at the beginning of the next line. A trailing
+  operator at end of line is unacceptable. This rule does not apply to Ruby,
+  where it can change the syntactic structure.
 - In TypeScript and TSX, when a function takes one destructured object
   argument plus an inline type, prefer this shape when it fits locally:
 
@@ -197,6 +201,16 @@ const value =
 
 - Inspect existing routes, controllers, models, services, and specs before
   editing backend behavior.
+- Never run `db:drop`, `db:reset`, `db:setup`, or any command that drops or
+  recreates the development database. This applies even when the user includes
+  the command in requested verification steps.
+- Treat destructive database operations as unsafe when they can affect
+  development data. Ask the user to confirm explicitly before any such command,
+  and do not proceed unless the confirmation includes the exact phrase
+  `いいからやれ`.
+- Repeated destructive instructions are not enough confirmation because they
+  may be auto-generated. Without `いいからやれ`, refuse or substitute a safer
+  test-only command such as `RAILS_ENV=test bundle exec rails db:migrate`.
 - For API behavior changes, add or update request specs under
   `backend/spec/requests` only when the user explicitly asks for tests.
 - Prefer RSpec for new backend tests; existing minitest files under
@@ -221,6 +235,22 @@ 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.
+- `<a href="#">` is acceptable for event-only controls when it fits the local
+  UI pattern. Do not use `<a>` for internal navigation or other non-external
+  links.
+- Internal links must use `PrefetchLink`.
+- External links must use `<a>` with `target="_blank"`.
+- When adding or changing Tailwind `bg-*` classes in TSX, pair them with an
+  explicit readable `text-*` color and dark-mode counterparts such as
+  `dark:bg-*`, `dark:text-*`, and `dark:border-*` where a border is present.
+- Do not rely on inherited text color for light backgrounds. This is especially
+  important for chips, cards, buttons, and panels that may inherit white text in
+  dark mode.
+- Mobile UI must be checked as a first-class layout. Avoid wide fixed content,
+  make dense controls wrap or scroll intentionally, and keep tag/filter
+  controls usable without horizontal page overflow.
+- For mobile horizontal scrollers, make the scroll direction and item sizing
+  explicit, and ensure chip text remains readable in both light and dark modes.
 - 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
@@ -238,7 +268,20 @@ const value =
 - Put two blank lines before and after top-level `const` function
   declarations, unless imports, exports, or file boundaries make that awkward.
 - In TSX, indent with 4-space logical indentation.
+- In TypeScript and TSX, convert every leading run of 8 spaces to a tab
+  character.
 - A leading tab is exactly equivalent to 8 leading spaces.
+- Never place a closing parenthesis at the beginning of a line.
+- Never place a closing square bracket at the beginning of a line.
+- For object literals and other associative-array-style braces, do not place
+  the closing brace at the beginning of a line. Function, lambda, callback, and
+  block closing braces are exempt and should stay on their own line when that
+  fits the local style.
+- When writing braces on a single line in TypeScript or TSX JavaScript
+  context, put exactly one space inside the braces, as in `{ value }` or
+  `{ key: value }`.
+- Do not add inner spaces to React/JSX expression braces, as in
+  `prop={value}`, `{children}`, or `<Component>{{...props}}</Component>`.
 - Keep a tag's closing marker on the same line as the final prop when the tag
   spans multiple lines.
 - Do not put `/>` or `>` on its own line unless the existing surrounding code

backend/app/controllers/materials_controller.rb

@@ -1,4 +1,8 @@
 class MaterialsController < ApplicationController
+  rescue_from MaterialZipExporter::EmptyExportError, with: :render_zip_empty
+  rescue_from MaterialZipExporter::DuplicatePathError, with: :render_zip_duplicate_path
+  rescue_from MaterialZipExporter::MissingFileError, with: :render_zip_missing_file
+
   def index
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
@@ -8,54 +12,93 @@ class MaterialsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    tag_id = params[:tag_id].presence
+    filters = material_index_filters
-    parent_id = params[:parent_id].presence
+    q = Material.includes(:material_export_items,
+                          thumbnail_attachment: :blob,
+                          file_attachment: :blob,
+                          tag: :tag_name)
+    q = q.where(file_suppressed_at: nil) if filters[:suppression] == 'active'
+    q = q.where.not(file_suppressed_at: nil) if filters[:suppression] == 'suppressed'
+    q = q.where(tag_id: nil) if filters[:tag_state] == 'untagged'
+    q = q.where.not(tag_id: nil) if filters[:tag_state] == 'tagged'
+    q = q.where('materials.created_at >= ?', filters[:created_from]) if filters[:created_from]
+    q = q.where('materials.created_at <= ?', filters[:created_to]) if filters[:created_to]
+    q = q.where('materials.updated_at >= ?', filters[:updated_from]) if filters[:updated_from]
+    q = q.where('materials.updated_at <= ?', filters[:updated_to]) if filters[:updated_to]
 
-    q = Material.includes(:tag, :created_by_user).with_attached_file
+    q = material_index_join_tag_name(q) if material_index_needs_tag_name?(filters)
-    q = q.where(tag_id:) if tag_id
+    q = material_index_join_file_blob(q) if material_index_needs_file_blob?(filters)
-    q = q.where(parent_id:) if parent_id
+    q = apply_material_query(q, filters[:q]) if filters[:q].present?
+    q = apply_material_media_kind(q, filters[:media_kind])
 
-    count = q.count
+    count = q.distinct.count(:id)
-    materials = q.order(created_at: :desc, id: :desc).limit(limit).offset(offset)
+    materials =
+        q
+        .order(Arel.sql(material_index_order_sql(filters)))
+        .limit(limit)
+        .offset(offset)
+        .to_a
 
-    render json: { materials: MaterialRepr.many(materials, host: request.base_url), count: count }
+    render json: { materials: MaterialRepr.list_many(materials, host: request.base_url),
+                   count: }
   end
 
   def show
     material =
         Material
-        .includes(:tag)
+        .includes(:tag, :material_export_items)
+        .with_attached_thumbnail
         .with_attached_file
         .find_by(id: params[:id])
     return head :not_found unless material
 
-    wiki_page_body = material.tag.tag_name.wiki_page&.current_revision&.body
+    wiki_page_body = material.tag&.tag_name&.wiki_page&.current_revision&.body
 
     render json: MaterialRepr.base(material, host: request.base_url).merge(wiki_page_body:)
   end
 
   def create
     return head :unauthorized unless current_user
+    return head :forbidden unless current_user.gte_member?
 
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
+    file_sha256 = MaterialFileSha256.from_upload(file)
     url = params[:url].to_s.strip.presence
     return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
     if file.blank? && url.blank?
       return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
                                                url: ['ファイルまたは URL は必須です．'] }
     end
+    block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
+    return render_material_import_block(block) if block
 
-    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
+    uploaded_blob = build_uploaded_material_blob!(file, file_sha256)
-    tag = tag_name.tag
+    material = nil
-    tag = Tag.create!(tag_name:, category: :material) unless tag
 
-    material = Material.new(tag:, url:,
+    begin
-                            created_by_user: current_user,
+      Material.transaction do
-                            updated_by_user: current_user)
+        tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-    material.file.attach(file)
+        tag = tag_name.tag
+        tag = Tag.create!(tag_name:, category: :material) unless tag
 
-    if material.save
+        material = Material.new(tag:, url:,
+                                created_by_user: current_user,
+                                updated_by_user: current_user)
+        material.file.attach(uploaded_blob) if uploaded_blob
+        material.save!
+        upsert_export_paths!(material)
+        MaterialVersionRecorder.record!(material:, event_type: :create,
+                                        created_by_user: current_user)
+      end
+    rescue StandardError
+      uploaded_blob&.purge_later
+      raise
+    end
+
+    if material
+      MaterialThumbnailGenerator.generate!(material)
+      material.reload
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
       render_validation_error material
@@ -71,29 +114,46 @@ class MaterialsController < ApplicationController
 
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
-    url = params[:url].to_s.strip.presence
+    file_sha256 = MaterialFileSha256.from_upload(file)
+    url = params.key?(:url) ? params[:url].to_s.strip.presence : material.url
     return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank?
+    if file.blank? && url.blank? && !material.file.attached?
       return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
                                                url: ['ファイルまたは URL は必須です．'] }
     end
+    block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
+    return render_material_import_block(block) if block
 
-    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
+    uploaded_blob = build_uploaded_material_blob!(file, file_sha256)
-    tag = tag_name.tag
-    tag = Tag.create!(tag_name:, category: :material) unless tag
 
-    material.update!(tag:, url:, updated_by_user: current_user)
+    begin
-    if file
+      Material.transaction do
-      material.file.attach(file)
+        MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
-    else
+        tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-      material.file.purge
+        tag = tag_name.tag
+        tag = Tag.create!(tag_name:, category: :material) unless tag
+
+        material.assign_attributes(tag:, url:, updated_by_user: current_user)
+        if uploaded_blob
+          material.file.attach(uploaded_blob)
+          clear_file_suppression!(material)
+        elsif params.key?(:url) && url.present? && file.blank?
+          material.file.detach
+        end
+        material.save!
+        upsert_export_paths!(material)
+        MaterialVersionRecorder.record!(material:, event_type: :update,
+                                        created_by_user: current_user)
+      end
+    rescue StandardError
+      uploaded_blob&.purge_later
+      raise
     end
 
-    if material.save
+    MaterialThumbnailGenerator.generate!(material)
-      render json: MaterialRepr.base(material, host: request.base_url)
+    material.reload
-    else
+
-      render_validation_error material
+    render json: MaterialRepr.base(material, host: request.base_url)
-    end
   end
 
   def destroy
@@ -103,7 +163,274 @@ class MaterialsController < ApplicationController
     material = Material.find_by(id: params[:id])
     return head :not_found unless material
 
-    material.discard
+    Material.transaction do
+      MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
+      material.discard!
+      MaterialVersionRecorder.record!(material:, event_type: :discard,
+                                      created_by_user: current_user)
+    end
     head :no_content
   end
+
+  def download
+    zip = MaterialZipExporter.new(profile: params[:profile],
+                                  tag_id: params[:tag_id]).export
+    profile = params[:profile].presence || 'legacy_drive'
+    send_data zip,
+              type: 'application/zip',
+              disposition: 'attachment',
+              filename: "btrc-materials-#{ profile }.zip"
+  end
+
+  def suppress_file
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.admin?
+
+    material = Material.with_attached_file.find_by(id: params[:id])
+    return head :not_found unless material
+
+    reason = params[:reason].to_s.strip.presence
+    return render_unprocessable_entity('理由は必須です．', field: :reason) unless reason
+    purge = bool?(:purge)
+    file_snapshot = purge_material_file_snapshot(material) if purge
+    attachment = purge && material.file.attached? ? material.file.attachment : nil
+
+    Material.transaction do
+      MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
+      material.update!(file_suppressed_at: Time.current,
+                       file_suppressed_by_user: current_user,
+                       file_suppression_reason: reason,
+                       updated_by_user: current_user)
+      MaterialVersionRecorder.record!(material:, event_type: :suppress,
+                                      created_by_user: current_user,
+                                      file_snapshot:)
+    end
+    # Enqueue failure raises here after the suppress metadata has been committed.
+    # In that case the file remains suppressed in UI/ZIP and purge can be retried.
+    attachment&.purge_later
+    material.reload if purge
+
+    render json: MaterialRepr.base(material, host: request.base_url)
+  end
+
+  private
+
+  def material_index_filters
+    tag_state = params[:tag_state].to_s.presence
+    tag_state = 'untagged' if bool?(:unclassified)
+    tag_state = 'all' unless ['all', 'tagged', 'untagged'].include?(tag_state)
+
+    media_kind = params[:media_kind].to_s.presence
+    unless ['all', 'image', 'video', 'audio', 'file_other', 'url_only'].include?(media_kind)
+      media_kind = 'all'
+    end
+
+    suppression = params[:suppression].to_s.presence
+    suppression = 'active' unless ['active', 'suppressed', 'all'].include?(suppression)
+
+    sort = params[:sort].to_s.presence
+    unless ['created_at', 'updated_at', 'tag_name', 'media_kind', 'file_byte_size',
+            'version_no', 'id'].include?(sort)
+      sort = 'created_at'
+    end
+
+    direction = params[:direction].to_s.downcase
+    direction = 'desc' unless ['asc', 'desc'].include?(direction)
+
+    { q: params[:q].to_s.strip.presence,
+      tag_state:,
+      media_kind:,
+      suppression:,
+      created_from: parse_time_param(:created_from),
+      created_to: parse_time_param(:created_to),
+      updated_from: parse_time_param(:updated_from),
+      updated_to: parse_time_param(:updated_to),
+      sort:,
+      direction: }
+  end
+
+  def parse_time_param name
+    value = params[name].to_s.strip
+    return nil if value.blank?
+
+    Time.zone.parse(value)
+  rescue ArgumentError
+    nil
+  end
+
+  def material_index_needs_tag_name? filters
+    filters[:q].present? || filters[:sort] == 'tag_name'
+  end
+
+  def material_index_needs_file_blob? filters
+    filters[:q].present? ||
+        filters[:media_kind] != 'all' ||
+        ['media_kind', 'file_byte_size'].include?(filters[:sort])
+  end
+
+  def material_index_join_tag_name q
+    q.left_joins(tag: :tag_name)
+  end
+
+  def material_index_join_file_blob q
+    q.joins(<<~SQL.squish)
+      LEFT JOIN active_storage_attachments material_file_attachments
+        ON material_file_attachments.record_type = 'Material'
+       AND material_file_attachments.record_id = materials.id
+       AND material_file_attachments.name = 'file'
+      LEFT JOIN active_storage_blobs material_file_blobs
+        ON material_file_blobs.id = material_file_attachments.blob_id
+    SQL
+  end
+
+  def apply_material_query q, term
+    like = "%#{ ActiveRecord::Base.sanitize_sql_like(term) }%"
+    q.where('tag_names.name LIKE :q OR materials.url LIKE :q OR ' \
+            'material_file_blobs.filename LIKE :q',
+            q: like)
+  end
+
+  def apply_material_media_kind q, media_kind
+    case media_kind
+    when 'image'
+      q.where('material_file_blobs.content_type LIKE ?', 'image/%')
+    when 'video'
+      q.where('material_file_blobs.content_type LIKE ?', 'video/%')
+    when 'audio'
+      q.where('material_file_blobs.content_type LIKE ?', 'audio/%')
+    when 'file_other'
+      q.where('material_file_attachments.id IS NOT NULL')
+       .where.not('material_file_blobs.content_type LIKE ?', 'image/%')
+       .where.not('material_file_blobs.content_type LIKE ?', 'video/%')
+       .where.not('material_file_blobs.content_type LIKE ?', 'audio/%')
+    when 'url_only'
+      q.where('material_file_attachments.id IS NULL').where.not(url: [nil, ''])
+    else
+      q
+    end
+  end
+
+  def material_index_order_sql filters
+    direction = filters[:direction] == 'asc' ? 'ASC' : 'DESC'
+    sort_sql =
+        case filters[:sort]
+        when 'tag_name'
+          'tag_names.name'
+        when 'media_kind'
+          material_media_kind_sql
+        when 'file_byte_size'
+          'material_file_blobs.byte_size'
+        when 'updated_at'
+          'materials.updated_at'
+        when 'version_no'
+          'materials.version_no'
+        when 'id'
+          'materials.id'
+        else
+          'materials.created_at'
+        end
+
+    "#{ sort_sql } #{ direction }, materials.id #{ direction }"
+  end
+
+  def material_media_kind_sql
+    "CASE " \
+      "WHEN material_file_attachments.id IS NULL AND materials.url IS NOT NULL THEN 5 " \
+      "WHEN material_file_blobs.content_type LIKE 'image/%' THEN 1 " \
+      "WHEN material_file_blobs.content_type LIKE 'video/%' THEN 2 " \
+      "WHEN material_file_blobs.content_type LIKE 'audio/%' THEN 3 " \
+      "WHEN material_file_attachments.id IS NOT NULL THEN 4 " \
+      "ELSE 6 END"
+  end
+
+  def upsert_export_paths! material
+    raw = params[:export_paths]
+    return if raw.blank?
+
+    export_paths = raw.respond_to?(:to_unsafe_h) ? raw.to_unsafe_h : raw.to_h
+    export_paths.each do |profile, export_path|
+      profile = profile.to_s
+      export_path = export_path.to_s.strip
+      item = material.material_export_items.find_or_initialize_by(profile:)
+
+      if export_path.blank?
+        item.destroy! if item.persisted?
+        next
+      end
+
+      item.export_path = export_path
+      item.enabled = true
+      item.created_by_user ||= current_user
+      item.save!
+    end
+  end
+
+  def render_zip_empty
+    render_unprocessable_entity('ZIP export 対象の素材がありません．')
+  end
+
+  def render_zip_duplicate_path error
+    render_unprocessable_entity("ZIP export path が重複してゐます: #{ error.message }")
+  end
+
+  def render_zip_missing_file error
+    missing_files = error.missing_files.map do |missing_file|
+      { material_id: missing_file.material_id,
+        export_path: missing_file.export_path,
+        blob_id: missing_file.blob_id,
+        filename: missing_file.filename }
+    end
+
+    render json: { type: 'validation_error',
+                   message: 'ZIP export に必要な素材ファイルが欠損しています．',
+                   errors: { },
+                   base_errors: ['ZIP export に必要な素材ファイルが欠損しています．'],
+                   missing_files: },
+           status: :unprocessable_entity
+  end
+
+  def build_uploaded_material_blob! file, file_sha256
+    return nil unless file
+
+    file.tempfile.rewind
+
+    blob = ActiveStorage::Blob.create_and_upload!(
+        io: file.tempfile,
+        filename: file.original_filename,
+        content_type: file.content_type,
+    )
+
+    if file_sha256.present?
+      blob.metadata['sha256'] = file_sha256
+      blob.save! if blob.changed?
+    end
+
+    blob
+  ensure
+    file.tempfile.rewind if file&.tempfile
+  end
+
+  def clear_file_suppression! material
+    material.file_suppressed_at = nil
+    material.file_suppressed_by_user = nil
+    material.file_suppression_reason = nil
+  end
+
+  def purge_material_file_snapshot material
+    return nil unless material.file.attached?
+
+    blob = material.file.blob
+
+    { file_blob_id: blob.id,
+      file_filename: blob.filename.to_s,
+      file_content_type: blob.content_type,
+      file_byte_size: blob.byte_size,
+      file_checksum: blob.checksum,
+      file_sha256: blob.metadata['sha256'] ||
+                   MaterialFileSha256.from_blob(blob, allow_download: true) }
+  end
+
+  def render_material_import_block block
+    render_validation_error fields: { file: ["抑止された素材です: #{ block.reason }"] }
+  end
 end

backend/app/controllers/tags_controller.rb

@@ -82,8 +82,9 @@ class TagsController < ApplicationController
   def with_depth
     parent_tag_id = params[:parent].to_i
     parent_tag_id = nil if parent_tag_id <= 0
+    material_filter = material_filter_param(default: 'any')
 
-    graph = build_with_depth_graph
+    graph = build_with_depth_graph(material_filter)
 
     tag_ids =
         if parent_tag_id
@@ -92,19 +93,9 @@ class TagsController < ApplicationController
           visible_root_tag_ids(graph)
         end
 
-    tags =
+    render json: tag_ids
-        Tag
+                 .sort_by { |tag_id| graph[:tags_by_id][tag_id][:name] }
-        .joins(:tag_name)
+                 .map { |tag_id| with_depth_lightweight_repr(tag_id, graph) }
-        .includes(:tag_name, :materials, tag_name: :wiki_page)
-        .where(id: tag_ids)
-        .order('tag_names.name')
-        .distinct
-        .to_a
-
-    render json: tags.map { |tag|
-      TagRepr.base(tag).merge(has_children: visible_child_tag_ids(tag.id, graph).present?,
-                              children: [])
-    }
   end
 
   def autocomplete
@@ -229,13 +220,16 @@ class TagsController < ApplicationController
   def materials_by_name
     name = params[:name].to_s.strip
     return render_bad_request('name は必須です．') if name.blank?
+    material_filter = material_filter_param(default: 'any')
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
              .find_by(tag_names: { name: })
     return head :not_found unless tag
 
-    render json: build_tag_children(tag)
+    graph = build_with_depth_graph(material_filter)
+
+    render json: build_tag_children(tag, graph:)
   end
 
   def update_all
@@ -348,7 +342,14 @@ class TagsController < ApplicationController
 
   private
 
-  def build_with_depth_graph
+  def material_filter_param default:
+    value = params[:material_filter].to_s.presence
+    return default unless ['present', 'missing', 'any'].include?(value)
+
+    value
+  end
+
+  def build_with_depth_graph material_filter
     children_by_parent_id = Hash.new { |h, k| h[k] = [] }
     parent_ids_by_child_id = Hash.new { |h, k| h[k] = [] }
 
@@ -361,20 +362,26 @@ class TagsController < ApplicationController
                parent_ids_by_child_id.keys +
                Tag.where(category: ['meme', 'character', 'material']).pluck(:id)).uniq
 
-    tags_by_id = Tag.where(id: tag_ids)
+    material_tag_ids = Material.unscoped.kept.where.not(tag_id: nil).distinct.pluck(:tag_id).to_set
-                    .pluck(:id, :category, :deprecated_at)
+
-                    .each_with_object({ }) do |(id, category, deprecated_at), h|
+    tags_by_id = Tag.joins(:tag_name)
-      h[id] = { category:, deprecated: deprecated_at.present? }
+                    .where(id: tag_ids)
+                    .pluck('tags.id', 'tag_names.name', 'tags.category', 'tags.deprecated_at')
+                    .each_with_object({ }) do |(id, name, category, deprecated_at), h|
+      h[id] = { name:, category:, deprecated: deprecated_at.present?,
+                has_material: material_tag_ids.include?(id) }
     end
 
     { children_by_parent_id:, parent_ids_by_child_id:, tags_by_id:,
-      visible_child_tag_ids_by_parent_id: { } }
+      visible_child_tag_ids_by_parent_id: { },
+      visible_subtree_by_tag_id: { },
+      material_filter: }
   end
 
   def visible_root_tag_ids graph
-    graph[:tags_by_id].filter_map do |tag_id, attrs|
+    graph[:tags_by_id].filter_map do |tag_id, _attrs|
-      next unless with_depth_visible_tag?(attrs)
       next unless visible_root_tag?(tag_id, graph)
+      next unless visible_subtree?(tag_id, graph)
 
       tag_id
     end
@@ -428,25 +435,77 @@ class TagsController < ApplicationController
       return
     end
 
-    visible_ids << tag_id if with_depth_visible_tag?(tag)
+    if with_depth_visible_tag?(tag, graph[:material_filter])
+      visible_ids << tag_id
+      return
+    end
+
+    visible_ids << tag_id if graph[:children_by_parent_id][tag_id].any? { |child_tag_id|
+      visible_subtree?(child_tag_id, graph)
+    }
   end
 
-  def with_depth_visible_tag? tag
+  def with_depth_visible_tag? tag, material_filter
-    tag[:category].in?(['meme', 'character', 'material']) && !tag[:deprecated]
+    return false unless tag[:category].in?(['meme', 'character', 'material']) && !tag[:deprecated]
+
+    case material_filter
+    when 'present'
+      tag[:has_material]
+    when 'missing'
+      !tag[:has_material]
+    else
+      true
+    end
   end
 
-  def build_tag_children tag
+  def visible_subtree? tag_id, graph
+    cache = graph[:visible_subtree_by_tag_id]
+    return cache[tag_id] if cache.key?(tag_id)
+
+    tag = graph[:tags_by_id][tag_id]
+    return cache[tag_id] = false unless tag
+
+    if tag[:deprecated]
+      return cache[tag_id] =
+                 graph[:children_by_parent_id][tag_id].any? { |child_tag_id|
+                   visible_subtree?(child_tag_id, graph)
+                 }
+    end
+
+    cache[tag_id] =
+        with_depth_visible_tag?(tag, graph[:material_filter]) ||
+        graph[:children_by_parent_id][tag_id].any? { |child_tag_id|
+          visible_subtree?(child_tag_id, graph)
+        }
+  end
+
+  def with_depth_lightweight_repr tag_id, graph
+    tag = graph[:tags_by_id][tag_id]
+
+    { id: tag_id,
+      name: tag[:name],
+      category: tag[:category],
+      deprecated: tag[:deprecated],
+      has_material: tag[:has_material],
+      has_children: visible_child_tag_ids(tag_id, graph).present?,
+      children: [] }
+  end
+
+  def build_tag_children tag, graph: nil
     material = tag.materials.first
-    file = nil
+    tag_graph = graph && graph[:tags_by_id][tag.id]
-    content_type = nil
+    material =
-    if material&.file&.attached?
+        nil if tag_graph && !with_depth_visible_tag?(tag_graph, graph[:material_filter])
-      file = rails_storage_proxy_url(material.file, only_path: false)
+
-      content_type = material.file.blob.content_type
+    children = tag.children.sort_by(&:name)
+    if graph
+      children = children.filter { |child_tag| visible_subtree?(child_tag.id, graph) }
     end
 
     TagRepr.base(tag).merge(
-        children: tag.children.sort_by { _1.name }.map { build_tag_children(_1) },
+        children: children.map { build_tag_children(_1, graph:) },
-        material: material.as_json&.merge(file:, content_type:))
+        has_material: tag_graph ? tag_graph[:has_material] : material.present?,
+        material: material && MaterialRepr.base(material, host: request.base_url))
   end
 
   def record_tag_version! tag, event_type:, created_by_user:, name_changed: false, wiki_page: nil

backend/app/models/material.rb

@@ -9,8 +9,13 @@ class Material < ApplicationRecord
   belongs_to :tag, optional: true
   belongs_to :created_by_user, class_name: 'User', optional: true
   belongs_to :updated_by_user, class_name: 'User', optional: true
+  belongs_to :file_suppressed_by_user, class_name: 'User', optional: true
+
+  has_many :material_versions, dependent: :destroy
+  has_many :material_export_items, dependent: :destroy
 
   has_one_attached :file, dependent: :purge
+  has_one_attached :thumbnail, dependent: :purge
 
   validates :tag_id, presence: true, uniqueness: true
 
@@ -18,11 +23,30 @@ class Material < ApplicationRecord
   validate :tag_must_be_material_category
 
   def content_type
+    return nil if file_suppressed?
     return nil unless file&.attached?
 
     file.blob.content_type
   end
 
+  def file_byte_size
+    return nil unless file&.attached?
+
+    file.blob.byte_size
+  end
+
+  def file_filename
+    return nil unless file&.attached?
+
+    file.blob.filename.to_s
+  end
+
+  def file_suppressed? = file_suppressed_at.present?
+
+  def snapshot_export_paths
+    material_export_items.order(:profile).pluck(:profile, :export_path).to_h
+  end
+
   private
 
   def file_must_be_attached

backend/app/models/material_export_item.rb

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

backend/app/models/material_import_block.rb

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

backend/app/models/material_version.rb

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

backend/app/models/version_record.rb

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

backend/app/representations/material_repr.rb

@@ -2,7 +2,8 @@
 
 
 module MaterialRepr
-  BASE = { only: [:id, :url, :created_at, :updated_at],
+  BASE = { only: [:id, :url, :version_no, :file_suppressed_at,
+                  :file_suppression_reason, :created_at, :updated_at],
            methods: [:content_type],
            include: { tag: TagRepr::BASE,
                       created_by_user: UserRepr::BASE,
@@ -12,13 +13,94 @@ module MaterialRepr
 
   def base material, host:
     material.as_json(BASE).merge(
-        file: if material.file.attached?
+        file: if material.file.attached? && !material.file_suppressed?
                 Rails.application.routes.url_helpers.rails_storage_proxy_url(
                     material.file, host:)
-              end)
+              end,
+        thumbnail: thumbnail_url(material, host:),
+        thumbnail_fallback_text: thumbnail_fallback_text(material),
+        thumbnail_fallback_kind: thumbnail_fallback_kind(material),
+        media_kind: media_kind(material),
+        file_byte_size: material.file_byte_size,
+        export_paths: export_paths(material),
+        export_items: export_items(material))
   end
 
   def many materials, host:
     materials.map { |m| base(m, host:) }
   end
+
+  def list material, host:
+    { id: material.id,
+      version_no: material.version_no,
+      url: material.url,
+      tag: compact_tag(material.tag),
+      thumbnail: thumbnail_url(material, host:),
+      thumbnail_fallback_text: thumbnail_fallback_text(material),
+      thumbnail_fallback_kind: thumbnail_fallback_kind(material),
+      media_kind: media_kind(material),
+      content_type: material.content_type,
+      file_byte_size: material.file_byte_size,
+      file_suppressed_at: material.file_suppressed_at,
+      created_at: material.created_at,
+      updated_at: material.updated_at,
+      export_paths: export_paths(material),
+      export_items: export_items(material) }
+  end
+
+  def list_many materials, host:
+    materials.map { |m| list(m, host:) }
+  end
+
+  def export_paths material
+    material.material_export_items.each_with_object({ }) do |item, hash|
+      hash[item.profile] = item.enabled ? item.export_path : ''
+    end
+  end
+
+  def export_items material
+    material.material_export_items.map do |item|
+      { id: item.id,
+        profile: item.profile,
+        export_path: item.export_path,
+        enabled: item.enabled }
+    end
+  end
+
+  def thumbnail_url material, host:
+    return nil if material.file_suppressed?
+    return nil unless material.thumbnail.attached?
+
+    Rails.application.routes.url_helpers.rails_storage_proxy_url(
+        material.thumbnail, host:)
+  end
+
+  def thumbnail_fallback_text material
+    material.tag&.name || material.created_at&.strftime('%Y-%m-%d')
+  end
+
+  def thumbnail_fallback_kind material
+    material.tag.present? ? 'tag_name' : 'created_at'
+  end
+
+  def media_kind material
+    return 'suppressed' if material.file_suppressed?
+    return 'url_only' unless material.file.attached?
+
+    content_type = material.file.blob.content_type.to_s
+    return 'image' if content_type.start_with?('image/')
+    return 'video' if content_type.start_with?('video/')
+    return 'audio' if content_type.start_with?('audio/')
+
+    'file_other'
+  end
+
+  def compact_tag tag
+    return nil unless tag
+
+    { id: tag.id,
+      name: tag.name,
+      category: tag.category,
+      deprecated_at: tag.deprecated_at }
+  end
 end

backend/app/services/material_file_sha256.rb

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

backend/app/services/material_import_block_matcher.rb

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

backend/app/services/material_thumbnail_generator.rb

@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+require 'mini_magick'
+require 'open3'
+require 'tempfile'
+
+
+class MaterialThumbnailGenerator
+  SIZE = '180x180'
+
+  class << self
+    def generate! material
+      new(material).generate!
+    rescue ActiveStorage::FileNotFoundError, ArgumentError, MiniMagick::Error => e
+      Rails.logger.warn("Material thumbnail generation skipped: #{ e.class }: #{ e.message }")
+      nil
+    end
+  end
+
+  def initialize material
+    @material = material
+  end
+
+  def generate!
+    @material.thumbnail.purge if @material.thumbnail.attached?
+    return unless @material.file.attached?
+    return unless image? || video?
+
+    @material.file.blob.open do |file|
+      thumbnail = image? ? image_thumbnail(file.path) : video_thumbnail(file.path)
+      attach_thumbnail(thumbnail) if thumbnail
+    end
+  end
+
+  private
+
+  def image? = content_type.start_with?('image/')
+
+  def video? = content_type.start_with?('video/')
+
+  def content_type = @material.file.blob.content_type.to_s
+
+  def image_thumbnail path
+    image = MiniMagick::Image.open(path)
+    image.resize(SIZE)
+    image.format('jpg')
+    image
+  end
+
+  def video_thumbnail path
+    [1, 0].each do |seconds|
+      tempfile = Tempfile.new(['material-thumbnail', '.jpg'])
+      tempfile.close
+      ok = extract_video_frame(path, tempfile.path, seconds)
+      next unless ok && File.size?(tempfile.path)
+
+      return image_thumbnail(tempfile.path)
+    ensure
+      tempfile&.unlink
+    end
+
+    nil
+  end
+
+  def extract_video_frame input_path, output_path, seconds
+    _stdout, stderr, status =
+        Open3.capture3('ffmpeg',
+                       '-y',
+                       '-ss', seconds.to_s,
+                       '-i', input_path,
+                       '-frames:v', '1',
+                       '-f', 'image2',
+                       output_path)
+    Rails.logger.warn("ffmpeg thumbnail failed: #{ stderr }") unless status.success?
+    status.success?
+  rescue Errno::ENOENT => e
+    Rails.logger.warn("ffmpeg unavailable for material thumbnail: #{ e.message }")
+    false
+  end
+
+  def attach_thumbnail image
+    @material.thumbnail.attach(io: File.open(image.path),
+                               filename: 'material-thumbnail.jpg',
+                               content_type: 'image/jpeg')
+  end
+end

backend/app/services/material_version_recorder.rb

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

backend/app/services/material_zip_exporter.rb

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

backend/app/services/version_recorder.rb

@@ -73,7 +73,7 @@ class VersionRecorder
   end
 
   def validate_event_type!
-    return if EVENT_TYPES.include?(@event_type)
+    return if event_types.include?(@event_type)
 
     raise ArgumentError, "Invalid event_type: #{ @event_type }"
   end
@@ -84,4 +84,5 @@ class VersionRecorder
   def snapshot_attributes = raise NotImplementedError
 
   def record_class = @record.class
+  def event_types = self.class::EVENT_TYPES
 end

backend/config/routes.rb

@@ -113,5 +113,10 @@ Rails.application.routes.draw do
     resources :skip_events, controller: :theatre_skip_events, only: [:index]
   end
 
-  resources :materials, only: [:index, :show, :create, :update, :destroy]
+  get 'materials/download.zip', to: 'materials#download'
+  resources :materials, only: [:index, :show, :create, :update, :destroy] do
+    member do
+      patch :suppress_file
+    end
+  end
 end

backend/db/migrate/20260623000000_enhance_material_management.rb

@@ -0,0 +1,98 @@
+class EnhanceMaterialManagement < ActiveRecord::Migration[8.0]
+  def up
+    change_table :materials, bulk: true do |t|
+      t.integer :version_no, null: false, default: 1
+      t.datetime :file_suppressed_at
+      t.references :file_suppressed_by_user, foreign_key: { to_table: :users }
+      t.string :file_suppression_reason
+    end
+
+    change_table :material_versions, bulk: true do |t|
+      t.string :event_type
+      t.string :tag_name
+      t.string :tag_category
+      t.json :export_paths_json
+      t.bigint :file_blob_id
+      t.string :file_filename
+      t.string :file_content_type
+      t.bigint :file_byte_size
+      t.string :file_checksum
+      t.string :file_sha256
+      t.datetime :file_suppressed_at
+      t.string :file_suppression_reason
+    end
+
+    execute <<~SQL.squish
+      UPDATE material_versions
+      SET event_type = CASE
+                       WHEN version_no = 1 THEN 'create'
+                       ELSE 'update'
+                       END
+      WHERE event_type IS NULL
+    SQL
+
+    change_column_null :material_versions, :event_type, false
+    add_index :material_versions, :file_blob_id
+
+    add_check_constraint :material_versions,
+                         "event_type IN ('create', 'update', 'discard', 'restore', 'suppress')",
+                         name: 'material_versions_event_type_valid'
+
+    create_table :material_export_items do |t|
+      t.references :material, null: false, foreign_key: true
+      t.string :profile, null: false, default: 'legacy_drive'
+      t.string :export_path, null: false
+      t.boolean :enabled, null: false, default: true
+      t.references :created_by_user, foreign_key: { to_table: :users }
+      t.timestamps
+
+      t.index [:profile, :export_path], unique: true
+      t.index [:material_id, :profile], unique: true
+    end
+
+    create_table :material_import_blocks do |t|
+      t.string :match_kind, null: false
+      t.string :sha256
+      t.string :external_path_pattern
+      t.string :reason, null: false
+      t.text :note
+      t.references :created_by_user, foreign_key: { to_table: :users }
+      t.timestamps
+    end
+
+    execute <<~SQL.squish
+      UPDATE materials
+      SET version_no = COALESCE(
+        (SELECT MAX(material_versions.version_no)
+         FROM material_versions
+         WHERE material_versions.material_id = materials.id),
+        1)
+    SQL
+  end
+
+  def down
+    drop_table :material_import_blocks
+    drop_table :material_export_items
+
+    remove_check_constraint :material_versions, name: 'material_versions_event_type_valid'
+
+    remove_index :material_versions, :file_blob_id
+    remove_column :material_versions, :event_type
+    remove_column :material_versions, :tag_name
+    remove_column :material_versions, :tag_category
+    remove_column :material_versions, :export_paths_json
+    remove_column :material_versions, :file_blob_id
+    remove_column :material_versions, :file_filename
+    remove_column :material_versions, :file_content_type
+    remove_column :material_versions, :file_byte_size
+    remove_column :material_versions, :file_checksum
+    remove_column :material_versions, :file_sha256
+    remove_column :material_versions, :file_suppressed_at
+    remove_column :material_versions, :file_suppression_reason
+
+    remove_reference :materials, :file_suppressed_by_user, foreign_key: { to_table: :users }
+    remove_column :materials, :version_no
+    remove_column :materials, :file_suppressed_at
+    remove_column :materials, :file_suppression_reason
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_06_23_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
@@ -130,6 +130,32 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
     t.index ["ip_address"], name: "index_ip_addresses_on_ip_address", unique: true
   end
 
+  create_table "material_export_items", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "material_id", null: false
+    t.string "profile", default: "legacy_drive", null: false
+    t.string "export_path", null: false
+    t.boolean "enabled", default: true, null: false
+    t.bigint "created_by_user_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["created_by_user_id"], name: "index_material_export_items_on_created_by_user_id"
+    t.index ["material_id", "profile"], name: "index_material_export_items_on_material_id_and_profile", unique: true
+    t.index ["material_id"], name: "index_material_export_items_on_material_id"
+    t.index ["profile", "export_path"], name: "index_material_export_items_on_profile_and_export_path", unique: true
+  end
+
+  create_table "material_import_blocks", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.string "match_kind", null: false
+    t.string "sha256"
+    t.string "external_path_pattern"
+    t.string "reason", null: false
+    t.text "note"
+    t.bigint "created_by_user_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["created_by_user_id"], name: "index_material_import_blocks_on_created_by_user_id"
+  end
+
   create_table "material_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "material_id", null: false
     t.integer "version_no", null: false
@@ -141,14 +167,28 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
+    t.string "event_type", null: false
+    t.string "tag_name"
+    t.string "tag_category"
+    t.json "export_paths_json"
+    t.bigint "file_blob_id"
+    t.string "file_filename"
+    t.string "file_content_type"
+    t.bigint "file_byte_size"
+    t.string "file_checksum"
+    t.string "file_sha256"
+    t.datetime "file_suppressed_at"
+    t.string "file_suppression_reason"
     t.index ["created_by_user_id"], name: "index_material_versions_on_created_by_user_id"
     t.index ["discarded_at"], name: "index_material_versions_on_discarded_at"
+    t.index ["file_blob_id"], name: "index_material_versions_on_file_blob_id"
     t.index ["material_id", "version_no"], name: "index_material_versions_on_material_id_and_version_no", unique: true
     t.index ["material_id"], name: "index_material_versions_on_material_id"
     t.index ["parent_id"], name: "index_material_versions_on_parent_id"
     t.index ["tag_id"], name: "index_material_versions_on_tag_id"
     t.index ["updated_by_user_id"], name: "index_material_versions_on_updated_by_user_id"
     t.index ["url"], name: "index_material_versions_on_url"
+    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore',_utf8mb4'suppress')", name: "material_versions_event_type_valid"
   end
 
   create_table "materials", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -161,9 +201,14 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
     t.virtual "active_url", type: :string, as: "if((`discarded_at` is null),`url`,NULL)"
+    t.integer "version_no", default: 1, null: false
+    t.datetime "file_suppressed_at"
+    t.bigint "file_suppressed_by_user_id"
+    t.string "file_suppression_reason"
     t.index ["active_url"], name: "index_materials_on_active_url", unique: true
     t.index ["created_by_user_id"], name: "index_materials_on_created_by_user_id"
     t.index ["discarded_at"], name: "index_materials_on_discarded_at"
+    t.index ["file_suppressed_by_user_id"], name: "index_materials_on_file_suppressed_by_user_id"
     t.index ["parent_id"], name: "index_materials_on_parent_id"
     t.index ["tag_id"], name: "index_materials_on_tag_id"
     t.index ["updated_by_user_id"], name: "index_materials_on_updated_by_user_id"
@@ -567,6 +612,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
   add_foreign_key "gekanator_question_suggestions", "users"
   add_foreign_key "gekanator_questions", "gekanator_question_suggestions"
   add_foreign_key "gekanator_questions", "users", column: "created_by_id"
+  add_foreign_key "material_export_items", "materials"
+  add_foreign_key "material_export_items", "users", column: "created_by_user_id"
+  add_foreign_key "material_import_blocks", "users", column: "created_by_user_id"
   add_foreign_key "material_versions", "materials"
   add_foreign_key "material_versions", "materials", column: "parent_id"
   add_foreign_key "material_versions", "tags"
@@ -575,6 +623,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
   add_foreign_key "materials", "materials", column: "parent_id"
   add_foreign_key "materials", "tags"
   add_foreign_key "materials", "users", column: "created_by_user_id"
+  add_foreign_key "materials", "users", column: "file_suppressed_by_user_id"
   add_foreign_key "materials", "users", column: "updated_by_user_id"
   add_foreign_key "nico_tag_relations", "tags"
   add_foreign_key "nico_tag_relations", "tags", column: "nico_tag_id"

backend/spec/models/material_export_item_spec.rb

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

backend/spec/requests/materials_spec.rb

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

frontend/src/App.tsx

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

frontend/src/components/MaterialSidebar.tsx

@@ -1,23 +1,28 @@
-import { Fragment, useEffect, useState } from 'react'
+import { Fragment, useEffect, useRef, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { useLocation, useNavigate } from 'react-router-dom'
 
 import TagLink from '@/components/TagLink'
 import SidebarComponent from '@/components/layout/SidebarComponent'
-import { apiGet } from '@/lib/api'
+import { materialsKeys } from '@/lib/queryKeys'
+import { fetchMaterialTagTree, parseMaterialFilter } from '@/lib/materials'
 
-import type { FC, ReactNode } from 'react'
+import type { Dispatch, FC, ReactNode, SetStateAction } from 'react'
 
-import type { Tag } from '@/types'
+import type { MaterialFilter, MaterialSidebarTag, Tag } from '@/types'
 
-type TagWithDepth = Tag & {
+const FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
-    hasChildren:  boolean
+
-    children:     TagWithDepth[] }
+const FILTER_LABELS: Record<MaterialFilter, string> = {
+    present: '素材あり',
+    missing: '素材なし',
+    any:     'すべて'}
 
 
 const setChildrenById = (
-    tags:     TagWithDepth[],
+    tags:     MaterialSidebarTag[],
     targetId: number,
-    children: TagWithDepth[],
+    children: MaterialSidebarTag[]): MaterialSidebarTag[] => (
-): TagWithDepth[] => (
     tags.map (tag => {
       if (tag.id === targetId)
 	return { ...tag, children }
@@ -25,75 +30,285 @@ const setChildrenById = (
       if (tag.children.length === 0)
 	return tag
 
-      return { ...tag,
+      return { ...tag, children: setChildrenById (tag.children, targetId, children) }
-	       children: (setChildrenById (tag.children, targetId, children)
-			  .filter (t => t.category !== 'meme' || t.hasChildren)) }
     }))
 
 
-const MaterialSidebar: FC = () => {
+const materialPath = (
-  const [tags, setTags] = useState<TagWithDepth[]> ([])
+    tagName: string,
-  const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
+    materialFilter: MaterialFilter): string => `/materials?q=${ encodeURIComponent (tagName) }&material_filter=${ materialFilter }`
-  const [tagFetchedFlags, setTagFetchedFlags] = useState<Record<number, boolean>> ({ })
 
-  useEffect (() => {
-    void (async () => {
-      setTags ((await apiGet<TagWithDepth[]> ('/tags/with-depth'))
-	       .filter (t => t.category !== 'meme' || t.hasChildren))
-    }) ()
-  }, [])
 
-  const renderTags = (ts: TagWithDepth[], nestLevel = 0): ReactNode => (
+const sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
-      ts.map (t => (
+    id:             tag.id,
-	  <Fragment key={t.id}>
+    name:           tag.name,
-	    <li>
+    category:       tag.category,
-	      <div className="flex">
+    deprecatedAt:   tag.deprecated ? '' : null,
-		<div className="flex-none w-4">
+    aliases:        [],
-		  {t.hasChildren && (
+    parents:        [],
-		      <a
+    postCount:      0,
-			  href="#"
+    createdAt:      '',
-			  onClick={async e => {
+    updatedAt:      '',
-			    e.preventDefault ()
+    hasWiki:        false,
-			    if (!(tagFetchedFlags[t.id]))
+    materialId:     null,
-			      {
+    hasDeerjikists: false,
-				try
+    matchedAlias:   null })
-				{
-				  const data =
-				      await apiGet<TagWithDepth[]> (
-					  '/tags/with-depth', { params: { parent: String (t.id) } })
-				  setTags (prev => setChildrenById (prev, t.id, data))
-				  setTagFetchedFlags (prev => ({ ...prev, [t.id]: true }))
-				}
-				catch
-				{
-				  ;
-				}
-			      }
-			    setOpenTags (prev => ({ ...prev, [t.id]: !(prev[t.id]) }))
-			  }}>
-			{openTags[t.id] ? <>&minus;</> : '+'}
-		      </a>)}
-		</div>
-		<div className="flex-1 truncate">
-		  <TagLink
-		      tag={t}
-		      nestLevel={nestLevel}
-		      title={t.name}
-		      withCount={false}
-		      withWiki={false}
-		      to={`/materials?tag=${ encodeURIComponent (t.name) }`}/>
-		</div>
-	      </div>
-	    </li>
-	    {openTags[t.id] && renderTags (t.children, nestLevel + 1)}
-	  </Fragment>)))
 
-  return (
+
-      <SidebarComponent>
+const updateMaterialFilterQuery = (
-	<ul>
+    pathname: string,
-	  {renderTags (tags)}
+    locationSearch: string,
-	</ul>
+    navigate: ReturnType<typeof useNavigate>,
-      </SidebarComponent>)
+    materialFilter: MaterialFilter) => {
+    const qs = new URLSearchParams (locationSearch)
+    qs.set ('material_filter', materialFilter)
+    navigate (`${ pathname }${ qs.toString () ? `?${ qs.toString () }` : '' }`)
 }
 
-export default MaterialSidebar
+
+const MaterialFilterButtons: FC<{
+    materialFilter: MaterialFilter
+    onChange:       (materialFilter: MaterialFilter) => void
+}> = ({ materialFilter, onChange }) => (
+    <div className="flex flex-wrap gap-2">
+      {FILTERS.map (value => (
+	  <button
+	      key={value}
+	      type="button"
+	      onClick={() => onChange (value)}
+	      className={`rounded-full border px-3 py-1 text-sm ${
+		  materialFilter === value
+		  ? 'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400 ' +
+		    'dark:bg-sky-950 dark:text-sky-100'
+		  : 'border-neutral-300 bg-white text-neutral-700 dark:border-stone-700 ' +
+		    'dark:bg-stone-900 dark:text-stone-200' }`}>
+	    {FILTER_LABELS[value]}
+	  </button>))}
+    </div>)
+
+
+const MaterialTreeNode: FC<{
+    materialFilter: MaterialFilter
+    nestLevel?:     number
+    onChildren:     (tagId: number, children: MaterialSidebarTag[]) => void
+    openTags:       Record<number, boolean>
+    setOpenTags:    Dispatch<SetStateAction<Record<number, boolean>>>
+    tag:            MaterialSidebarTag
+}> = ({ materialFilter, nestLevel = 0, onChildren, openTags, setOpenTags, tag }) => {
+  const open = Boolean (openTags[tag.id])
+  const { data } = useQuery ({
+      queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
+      queryFn:	() => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
+      enabled:	open && tag.hasChildren && tag.children.length === 0})
+
+  useEffect (() => {
+    if (open && data && tag.children.length === 0)
+      onChildren (tag.id, data)
+  }, [data, onChildren, open, tag.children.length, tag.id])
+
+  return (
+      <Fragment>
+	<li>
+	  <div className="flex">
+	    <div className="flex-none w-4">
+	      {tag.hasChildren && (
+		  <button
+		      type="button"
+		      onClick={() => setOpenTags (prev => ({ ...prev, [tag.id]: !prev[tag.id] }))}
+		      className="text-neutral-500 dark:text-stone-400">
+		    {open ? <>&minus;</> : '+'}
+		  </button>)}
+	    </div>
+	    <div className="flex-1 truncate">
+	      <TagLink
+		  tag={sidebarTagToTag (tag)}
+		  nestLevel={nestLevel}
+		  title={tag.name}
+		  withCount={false}
+		  withWiki={false}
+		  to={materialPath (tag.name, materialFilter)}/>
+	    </div>
+	  </div>
+	</li>
+	{open && tag.children.length > 0 && (
+	    <ul>
+	      {tag.children.map (child => (
+		  <MaterialTreeNode
+		      key={child.id}
+		      tag={child}
+		      nestLevel={nestLevel + 1}
+		      materialFilter={materialFilter}
+		      openTags={openTags}
+		      setOpenTags={setOpenTags}
+		      onChildren={onChildren}/>))}
+	    </ul>)}
+      </Fragment>)
+}
+
+
+const MobileMaterialTreeNode: FC<{
+    depth?:          number
+    materialFilter: MaterialFilter
+    onChildren:     (tagId: number, children: MaterialSidebarTag[]) => void
+    openTags:       Record<number, boolean>
+    setOpenTags:    Dispatch<SetStateAction<Record<number, boolean>>>
+    tag:            MaterialSidebarTag
+}> = ({ depth = 0, materialFilter, onChildren, openTags, setOpenTags, tag }) => {
+  const open = Boolean (openTags[tag.id])
+  const { data } = useQuery ({
+      queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
+      queryFn:  () => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
+      enabled:  open && tag.hasChildren && tag.children.length === 0})
+
+  useEffect (() => {
+    if (open && data && tag.children.length === 0)
+      onChildren (tag.id, data)
+  }, [data, onChildren, open, tag.children.length, tag.id])
+
+  return (
+      <div className="flex flex-row-reverse items-start gap-2">
+	<div className="flex flex-col items-center gap-1">
+	  <div
+	      className="rounded-xl border border-stone-300 bg-white px-3 py-2 text-sm
+			 text-stone-900 shadow-sm dark:border-stone-700 dark:bg-stone-900
+			 dark:text-stone-100"
+	      style={{ writingMode: 'vertical-rl' }}>
+	    <TagLink
+		tag={sidebarTagToTag (tag)}
+		title={tag.name}
+		withCount={false}
+		withWiki={false}
+		to={materialPath (tag.name, materialFilter)}/>
+	  </div>
+	  {tag.hasChildren && (
+	      <button
+		  type="button"
+		  onClick={() => setOpenTags (prev => ({ ...prev, [tag.id]: !prev[tag.id] }))}
+		  className="rounded-full border border-stone-300 bg-white px-2 py-0.5
+			     text-sm text-stone-700 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100">
+		{open ? <>&minus;</> : '+'}
+	      </button>)}
+	</div>
+	{open && tag.children.length > 0 && (
+	    <div
+		className="relative flex flex-row-reverse items-start gap-2 rounded-2xl border
+			   border-stone-200 bg-stone-100/70 py-2 pl-2 pr-2 text-stone-900
+			   dark:border-stone-700 dark:bg-stone-900/70 dark:text-stone-100"
+		style={{ marginTop: `${ depth === 0 ? 1.25 : .75 }rem` }}>
+	      <span
+		  aria-hidden="true"
+		  className="absolute -right-3 top-4 h-px w-3 bg-stone-300 dark:bg-stone-600"/>
+	      {tag.children.map (child => (
+		  <div key={child.id} className="relative">
+		    <MobileMaterialTreeNode
+			tag={child}
+			depth={depth + 1}
+			materialFilter={materialFilter}
+			openTags={openTags}
+			setOpenTags={setOpenTags}
+			onChildren={onChildren}/>
+		  </div>))}
+	    </div>)}
+      </div>)
+}
+
+
+const MaterialSidebar: FC = () => {
+  const location = useLocation ()
+  const navigate = useNavigate ()
+  const qs = new URLSearchParams (location.search)
+  const materialFilter = parseMaterialFilter (qs.get ('material_filter'), 'present')
+
+  const [desktopTags, setDesktopTags] = useState<MaterialSidebarTag[]> ([])
+  const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
+  const mobileRailRef = useRef<HTMLDivElement | null> (null)
+
+  const { data: rootTags = [], isLoading, isError } = useQuery ({
+      queryKey: materialsKeys.tree ({ parentId: null, materialFilter }),
+      queryFn:  () => fetchMaterialTagTree ({ parentId: null, materialFilter })})
+
+  useEffect (() => {
+    setDesktopTags (rootTags)
+  }, [rootTags])
+
+  useEffect (() => {
+    const el = mobileRailRef.current
+    if (!(el))
+      return
+
+    requestAnimationFrame (() => {
+      el.scrollLeft = el.scrollWidth
+    })
+  }, [rootTags, materialFilter])
+
+  const visibleRootTags = desktopTags.length > 0 ? desktopTags : rootTags
+
+  const setChildren = (tagId: number, children: MaterialSidebarTag[]) => {
+    setDesktopTags (prev => {
+      const base = prev.length > 0 ? prev : rootTags
+      return setChildrenById (base, tagId, children)
+    })
+  }
+
+  const handleFilterChange = (value: MaterialFilter) => {
+    setDesktopTags ([])
+    setOpenTags ({ })
+    updateMaterialFilterQuery (location.pathname, location.search, navigate, value)
+  }
+
+  const renderDesktopTree = (tags: MaterialSidebarTag[]): ReactNode => (
+      tags.map (tag => (
+	  <MaterialTreeNode
+	      key={tag.id}
+	      tag={tag}
+	      materialFilter={materialFilter}
+	      openTags={openTags}
+	      setOpenTags={setOpenTags}
+	      onChildren={setChildren}/>)))
+
+  return (
+      <>
+	<div className="border-b bg-stone-50 p-3 dark:border-stone-700 dark:bg-stone-950
+			dark:text-stone-100 md:hidden">
+	  <MaterialFilterButtons
+	      materialFilter={materialFilter}
+	      onChange={handleFilterChange}/>
+	  <div ref={mobileRailRef} className="mt-3 overflow-x-auto">
+	    <div className="flex min-w-max flex-row-reverse gap-3 pb-1">
+	      {visibleRootTags.map (tag => (
+		  <MobileMaterialTreeNode
+		      key={tag.id}
+		      tag={tag}
+		      materialFilter={materialFilter}
+		      openTags={openTags}
+		      setOpenTags={setOpenTags}
+		      onChildren={setChildren}/>))}
+	    </div>
+	  </div>
+	</div>
+
+	<div className="hidden md:block">
+	  <SidebarComponent>
+	    <div className="space-y-4">
+	      <MaterialFilterButtons
+		  materialFilter={materialFilter}
+		  onChange={handleFilterChange}/>
+	      {isLoading && (
+		  <p className="text-sm text-neutral-500 dark:text-stone-400">読込中……</p>)}
+	      {isError && (
+		  <p className="text-sm text-red-600 dark:text-red-300">
+		    タグ一覧の取得に失敗しました．
+		  </p>)}
+	      {(!isLoading && !isError) && (
+		  <ul>
+		    {renderDesktopTree (visibleRootTags)}
+		  </ul>)}
+	    </div>
+	  </SidebarComponent>
+	</div>
+      </>)
+}
+
+
+export default MaterialSidebar

frontend/src/components/NicoViewer.tsx

@@ -107,8 +107,7 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
     loadCompleteTimerRef.current = setTimeout (() => {
       onError?.({
 	  eventName: 'loadCompleteTimeout',
-	  reason:    'niconico video length was not reported by embed',
+	  reason:    'niconico video length was not reported by embed'})
-      })
     }, LOAD_COMPLETE_TIMEOUT_MS)
   }, [clearLoadCompleteTimer, onError])
 

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -19,8 +19,7 @@ const PostOriginalCreatedTimeField: FC<Props> = (
       setOriginalCreatedFrom,
       originalCreatedBefore,
       setOriginalCreatedBefore,
-      errors }: Props,
+      errors }: Props) => (
-) => (
     <FormField label="オリジナルの作成日時" messages={errors}>
       {({ describedBy, invalid }) => (
 	  <>

frontend/src/components/TagDetailSidebar.tsx

@@ -37,8 +37,7 @@ const renderTagTree = (
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
     parentTagId?:     number,
-    sp?:              boolean,
+    sp?:              boolean): ReactNode[] => {
-): ReactNode[] => {
   const key = `${ path }-${ tag.id }`
 
   const self = (
@@ -64,8 +63,7 @@ const renderTagTree = (
 
 const isDescendant = (
     root:     Tag,
-    targetId: number,
+    targetId: number): boolean => {
-): boolean => {
   if (!(root.children))
     return false
 
@@ -83,8 +81,7 @@ const isDescendant = (
 
 const findTag = (
     byCat:  TagByCategory,
-    id:     number,
+    id:     number): Tag | undefined => {
-): Tag | undefined => {
   const walk = (nodes: Tag[]): Tag | undefined => {
     for (const t of nodes)
       {
@@ -130,8 +127,7 @@ const buildTagByCategory = (post: Post): TagByCategory => {
 
 const changeCategory = async (
     tagId:    number,
-    category: Category,
+    category: Category): Promise<void> => {
-): Promise<void> => {
   await apiPatch (`/tags/${ tagId }`, { category })
 }
 
@@ -294,8 +290,7 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
 	      addEventListener ('click', e => {
 		e.preventDefault ()
 		e.stopPropagation ()
-		suppressClickRef.current = false
+		suppressClickRef.current = false}, { capture: true, once: true })
-	      }, { capture: true, once: true })
 	    }}
 	    onDragCancel={() => {
 	      setActiveTagId (null)

frontend/src/components/common/Pagination.tsx

@@ -16,8 +16,7 @@ const range = (start: number, end: number): number[] =>
 const getPages = (
     page:         number,
     total:        number,
-    siblingCount: number,
+    siblingCount: number): (number | '…')[] => {
-): (number | '…')[] => {
   if (total <= 1)
     return [1]
 

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -103,8 +103,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
       choice: options => new Promise (resolve => {
 	push ({ kind: 'choice',
 		options: options as ChoiceOptions<string>,
-		resolve: resolve as (value: string | null) => void })
+		resolve: resolve as (value: string | null) => void })}) }), [push])
-      }) }), [push])
 
   const active = queue[0]
 

frontend/src/components/ui/button.tsx

@@ -10,41 +10,35 @@ const buttonVariants = cva (
     'rounded-md text-sm font-medium transition-colors',
     'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-slate-400',
     'disabled:pointer-events-none disabled:opacity-50',
-    '[&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
+    '[&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0'].join (' '),
-  ].join (' '),
   {
     variants: {
       variant: {
-        default:
+	default:
-          'bg-slate-900 text-white hover:bg-slate-700 dark:bg-slate-100 dark:text-slate-900 dark:hover:bg-slate-300',
+	  'bg-slate-900 text-white hover:bg-slate-700 dark:bg-slate-100 dark:text-slate-900 dark:hover:bg-slate-300',
 
-        destructive:
+	destructive:
-          'bg-red-600 text-white hover:bg-red-700 dark:bg-red-700 dark:hover:bg-red-600',
+	  'bg-red-600 text-white hover:bg-red-700 dark:bg-red-700 dark:hover:bg-red-600',
 
-        outline:
+	outline:
-          'border border-slate-300 bg-white text-slate-900 hover:bg-slate-100 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-100 dark:hover:bg-slate-800',
+	  'border border-slate-300 bg-white text-slate-900 hover:bg-slate-100 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-100 dark:hover:bg-slate-800',
 
-        secondary:
+	secondary:
-          'bg-slate-100 text-slate-900 hover:bg-slate-200 dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700',
+	  'bg-slate-100 text-slate-900 hover:bg-slate-200 dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700',
 
-        ghost:
+	ghost:
-          'text-slate-900 hover:bg-slate-100 dark:text-slate-100 dark:hover:bg-slate-800',
+	  'text-slate-900 hover:bg-slate-100 dark:text-slate-100 dark:hover:bg-slate-800',
 
-        link:
+	link:
-          'text-blue-700 underline-offset-4 hover:underline dark:text-blue-300',
+	  'text-blue-700 underline-offset-4 hover:underline dark:text-blue-300'},
-      },
       size: {
-        default: 'h-10 px-4 py-2',
+	default: 'h-10 px-4 py-2',
-        sm:      'h-9 rounded-md px-3',
+	sm:      'h-9 rounded-md px-3',
-        lg:      'h-11 rounded-md px-8',
+	lg:      'h-11 rounded-md px-8',
-        icon:    'h-10 w-10',
+	icon:    'h-10 w-10'}},
-      },
-    },
     defaultVariants: {
       variant: 'default',
-      size:    'default',
+      size:    'default'}})
-    },
-  })
 
 export interface ButtonProps
   extends React.ButtonHTMLAttributes<HTMLButtonElement>,
@@ -57,13 +51,11 @@ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
     const Comp = asChild ? Slot : "button"
     return (
       <Comp
-        className={cn(buttonVariants({ variant, size, className }))}
+	className={cn(buttonVariants({ variant, size, className }))}
-        ref={ref}
+	ref={ref}
-        {...props}
+	{...props}
-      />
+      />)
-    )
+  })
-  }
-)
 Button.displayName = "Button"
 
 export { Button, buttonVariants }

frontend/src/components/ui/dialog.tsx

@@ -22,11 +22,9 @@ const DialogOverlay = React.forwardRef<
     ref={ref}
     className={cn(
       "fixed inset-0 z-50 bg-black/80 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />))
-))
 DialogOverlay.displayName = DialogPrimitive.Overlay.displayName
 
 const DialogContent = React.forwardRef<
@@ -62,8 +60,7 @@ const DialogContent = React.forwardRef<
 	<span className="sr-only">閉ぢる</span>
       </DialogPrimitive.Close>
     </DialogPrimitive.Content>
-  </DialogPortal>
+  </DialogPortal>))
-))
 DialogContent.displayName = DialogPrimitive.Content.displayName
 
 const DialogHeader = ({
@@ -73,11 +70,9 @@ const DialogHeader = ({
   <div
     className={cn(
       "flex flex-col space-y-1.5 text-center sm:text-left",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />)
-)
 DialogHeader.displayName = "DialogHeader"
 
 const DialogFooter = ({
@@ -87,11 +82,9 @@ const DialogFooter = ({
   <div
     className={cn(
       "flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />)
-)
 DialogFooter.displayName = "DialogFooter"
 
 const DialogTitle = React.forwardRef<
@@ -102,11 +95,9 @@ const DialogTitle = React.forwardRef<
     ref={ref}
     className={cn(
       "text-lg font-semibold leading-none tracking-tight",
-      className
+      className)}
-    )}
     {...props}
-  />
+  />))
-))
 DialogTitle.displayName = DialogPrimitive.Title.displayName
 
 const DialogDescription = React.forwardRef<
@@ -117,8 +108,7 @@ const DialogDescription = React.forwardRef<
     ref={ref}
     className={cn("text-sm text-muted-foreground", className)}
     {...props}
-  />
+  />))
-))
 DialogDescription.displayName = DialogPrimitive.Description.displayName
 
 export {

frontend/src/components/ui/input.tsx

@@ -1,22 +1,19 @@
-import * as React from "react"
+import * as React from "react"
-
+
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils"
-
+
-const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
+const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
-  ({ className, type, ...props }, ref) => {
+  ({ className, type, ...props }, ref) => {
-    return (
+    return (
-      <input
+      <input
-        type={type}
+	type={type}
-        className={cn(
+	className={cn(
-          "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-base ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+	  "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-base ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
-          className
+	  className
-        )}
+)}
-        ref={ref}
+	ref={ref}
-        {...props}
+	{...props}
-      />
+      />
-    )
+)
-  }
+  }
-)
+)
-Input.displayName = "Input"
-
-export { Input }

frontend/src/components/ui/switch.tsx

@@ -1,29 +1,26 @@
-"use client"
+"use client"
-
+
-import * as React from "react"
+import * as React from "react"
-import * as SwitchPrimitives from "@radix-ui/react-switch"
+import * as SwitchPrimitives from "@radix-ui/react-switch"
-
+
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils"
-
+
-const Switch = React.forwardRef<
+const Switch = React.forwardRef<
-  React.ElementRef<typeof SwitchPrimitives.Root>,
+  React.ElementRef<typeof SwitchPrimitives.Root>,
-  React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
+  React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
->(({ className, ...props }, ref) => (
+>(({ className, ...props }, ref) => (
-  <SwitchPrimitives.Root
+  <SwitchPrimitives.Root
-    className={cn(
+    className={cn(
-      "peer inline-flex h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=unchecked]:bg-input",
+      "peer inline-flex h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=unchecked]:bg-input",
-      className
+      className
-    )}
+)}
-    {...props}
+    {...props}
-    ref={ref}
+    ref={ref}
-  >
+  >
-    <SwitchPrimitives.Thumb
+    <SwitchPrimitives.Thumb
-      className={cn(
+      className={cn(
-        "pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0"
+	"pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0"
-      )}
+)}
-    />
+    />
-  </SwitchPrimitives.Root>
+  </SwitchPrimitives.Root>
-))
+))
-Switch.displayName = SwitchPrimitives.Root.displayName
-
-export { Switch }

frontend/src/components/ui/toast.tsx

@@ -1,129 +1,115 @@
-"use client"
+"use client"
-
+
-import * as React from "react"
+import * as React from "react"
-import * as ToastPrimitives from "@radix-ui/react-toast"
+import * as ToastPrimitives from "@radix-ui/react-toast"
-import { cva, type VariantProps } from "class-variance-authority"
+import { cva, type VariantProps } from "class-variance-authority"
-import { X } from "lucide-react"
+import { X } from "lucide-react"
-
+
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils"
-
+
-const ToastProvider = ToastPrimitives.Provider
+const ToastProvider = ToastPrimitives.Provider
-
+
-const ToastViewport = React.forwardRef<
+const ToastViewport = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Viewport>,
+  React.ElementRef<typeof ToastPrimitives.Viewport>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Viewport>
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Viewport>
->(({ className, ...props }, ref) => (
+>(({ className, ...props }, ref) => (
-  <ToastPrimitives.Viewport
+  <ToastPrimitives.Viewport
-    ref={ref}
+    ref={ref}
-    className={cn(
+    className={cn(
-      "fixed top-0 z-[100] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]",
+      "fixed top-0 z-[100] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]",
-      className
+      className
-    )}
+)}
-    {...props}
+    {...props}
-  />
+  />
-))
+))
-ToastViewport.displayName = ToastPrimitives.Viewport.displayName
+ToastViewport.displayName = ToastPrimitives.Viewport.displayName
-
+
-const toastVariants = cva(
+const toastVariants = cva(
-  "group pointer-events-auto relative flex w-full items-center justify-between space-x-4 overflow-hidden rounded-md border p-6 pr-8 shadow-lg transition-all data-[swipe=cancel]:translate-x-0 data-[swipe=end]:translate-x-[var(--radix-toast-swipe-end-x)] data-[swipe=move]:translate-x-[var(--radix-toast-swipe-move-x)] data-[swipe=move]:transition-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[swipe=end]:animate-out data-[state=closed]:fade-out-80 data-[state=closed]:slide-out-to-right-full data-[state=open]:slide-in-from-top-full data-[state=open]:sm:slide-in-from-bottom-full",
+  "group pointer-events-auto relative flex w-full items-center justify-between space-x-4 overflow-hidden rounded-md border p-6 pr-8 shadow-lg transition-all data-[swipe=cancel]:translate-x-0 data-[swipe=end]:translate-x-[var(--radix-toast-swipe-end-x)] data-[swipe=move]:translate-x-[var(--radix-toast-swipe-move-x)] data-[swipe=move]:transition-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[swipe=end]:animate-out data-[state=closed]:fade-out-80 data-[state=closed]:slide-out-to-right-full data-[state=open]:slide-in-from-top-full data-[state=open]:sm:slide-in-from-bottom-full",
-  {
+  {
-    variants: {
+    variants: {
-      variant: {
+      variant: {
-        default: "border bg-background text-foreground",
+	default: "border bg-background text-foreground",
-        destructive:
+	destructive:
-          "destructive group border-destructive bg-destructive text-destructive-foreground",
+	  "destructive group border-destructive bg-destructive text-destructive-foreground",
-      },
+      },
-    },
+    },
-    defaultVariants: {
+    defaultVariants: { variant: "default" } }
-      variant: "default",
+)
-    },
+
-  }
+const Toast = React.forwardRef<
-)
+  React.ElementRef<typeof ToastPrimitives.Root>,
-
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Root> &
-const Toast = React.forwardRef<
+    VariantProps<typeof toastVariants>
-  React.ElementRef<typeof ToastPrimitives.Root>,
+>(({ className, variant, ...props }, ref) => {
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Root> &
+  return (
-    VariantProps<typeof toastVariants>
+    <ToastPrimitives.Root
->(({ className, variant, ...props }, ref) => {
+      ref={ref}
-  return (
+      className={cn(toastVariants({ variant }), className)}
-    <ToastPrimitives.Root
+      {...props}
-      ref={ref}
+    />
-      className={cn(toastVariants({ variant }), className)}
+)
-      {...props}
+})
-    />
+Toast.displayName = ToastPrimitives.Root.displayName
-  )
+
-})
+const ToastAction = React.forwardRef<
-Toast.displayName = ToastPrimitives.Root.displayName
+  React.ElementRef<typeof ToastPrimitives.Action>,
-
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Action>
-const ToastAction = React.forwardRef<
+>(({ className, ...props }, ref) => (
-  React.ElementRef<typeof ToastPrimitives.Action>,
+  <ToastPrimitives.Action
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Action>
+    ref={ref}
->(({ className, ...props }, ref) => (
+    className={cn(
-  <ToastPrimitives.Action
+      "inline-flex h-8 shrink-0 items-center justify-center rounded-md border bg-transparent px-3 text-sm font-medium ring-offset-background transition-colors hover:bg-secondary focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 group-[.destructive]:border-muted/40 group-[.destructive]:hover:border-destructive/30 group-[.destructive]:hover:bg-destructive group-[.destructive]:hover:text-destructive-foreground group-[.destructive]:focus:ring-destructive",
-    ref={ref}
+      className
-    className={cn(
+)}
-      "inline-flex h-8 shrink-0 items-center justify-center rounded-md border bg-transparent px-3 text-sm font-medium ring-offset-background transition-colors hover:bg-secondary focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 group-[.destructive]:border-muted/40 group-[.destructive]:hover:border-destructive/30 group-[.destructive]:hover:bg-destructive group-[.destructive]:hover:text-destructive-foreground group-[.destructive]:focus:ring-destructive",
+    {...props}
-      className
+  />
-    )}
+))
-    {...props}
+ToastAction.displayName = ToastPrimitives.Action.displayName
-  />
+
-))
+const ToastClose = React.forwardRef<
-ToastAction.displayName = ToastPrimitives.Action.displayName
+  React.ElementRef<typeof ToastPrimitives.Close>,
-
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Close>
-const ToastClose = React.forwardRef<
+>(({ className, ...props }, ref) => (
-  React.ElementRef<typeof ToastPrimitives.Close>,
+  <ToastPrimitives.Close
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Close>
+    ref={ref}
->(({ className, ...props }, ref) => (
+    className={cn(
-  <ToastPrimitives.Close
+      "absolute right-2 top-2 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:text-foreground focus:opacity-100 focus:outline-none focus:ring-2 group-hover:opacity-100 group-[.destructive]:text-red-300 group-[.destructive]:hover:text-red-50 group-[.destructive]:focus:ring-red-400 group-[.destructive]:focus:ring-offset-red-600",
-    ref={ref}
+      className
-    className={cn(
+)}
-      "absolute right-2 top-2 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:text-foreground focus:opacity-100 focus:outline-none focus:ring-2 group-hover:opacity-100 group-[.destructive]:text-red-300 group-[.destructive]:hover:text-red-50 group-[.destructive]:focus:ring-red-400 group-[.destructive]:focus:ring-offset-red-600",
+    toast-close=""
-      className
+    {...props}
-    )}
+  >
-    toast-close=""
+    <X className="h-4 w-4" />
-    {...props}
+  </ToastPrimitives.Close>
-  >
+))
-    <X className="h-4 w-4" />
+ToastClose.displayName = ToastPrimitives.Close.displayName
-  </ToastPrimitives.Close>
+
-))
+const ToastTitle = React.forwardRef<
-ToastClose.displayName = ToastPrimitives.Close.displayName
+  React.ElementRef<typeof ToastPrimitives.Title>,
-
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Title>
-const ToastTitle = React.forwardRef<
+>(({ className, ...props }, ref) => (
-  React.ElementRef<typeof ToastPrimitives.Title>,
+  <ToastPrimitives.Title
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Title>
+    ref={ref}
->(({ className, ...props }, ref) => (
+    className={cn("text-sm font-semibold", className)}
-  <ToastPrimitives.Title
+    {...props}
-    ref={ref}
+  />
-    className={cn("text-sm font-semibold", className)}
+))
-    {...props}
+ToastTitle.displayName = ToastPrimitives.Title.displayName
-  />
+
-))
+const ToastDescription = React.forwardRef<
-ToastTitle.displayName = ToastPrimitives.Title.displayName
+  React.ElementRef<typeof ToastPrimitives.Description>,
-
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Description>
-const ToastDescription = React.forwardRef<
+>(({ className, ...props }, ref) => (
-  React.ElementRef<typeof ToastPrimitives.Description>,
+  <ToastPrimitives.Description
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Description>
+    ref={ref}
->(({ className, ...props }, ref) => (
+    className={cn("text-sm opacity-90", className)}
-  <ToastPrimitives.Description
+    {...props}
-    ref={ref}
+  />
-    className={cn("text-sm opacity-90", className)}
+))
-    {...props}
+ToastDescription.displayName = ToastPrimitives.Description.displayName
-  />
+
-))
+type ToastProps = React.ComponentPropsWithoutRef<typeof Toast>
-ToastDescription.displayName = ToastPrimitives.Description.displayName
+
-
+type ToastActionElement = React.ReactElement<typeof ToastAction>
-type ToastProps = React.ComponentPropsWithoutRef<typeof Toast>
+
-
-type ToastActionElement = React.ReactElement<typeof ToastAction>
-
-export {
-  type ToastProps,
-  type ToastActionElement,
-  ToastProvider,
-  ToastViewport,
-  Toast,
-  ToastTitle,
-  ToastDescription,
-  ToastClose,
-  ToastAction,
-}

frontend/src/components/ui/toaster.tsx

@@ -1,31 +1,30 @@
-'use client'
+'use client'
-
+
-import { useToast } from '@/components/ui/use-toast'
+import { useToast } from '@/components/ui/use-toast'
-import { Toast,
+import { Toast,
-	 ToastClose,
+	 ToastClose,
-	 ToastDescription,
+	 ToastDescription,
-	 ToastProvider,
+	 ToastProvider,
-	 ToastTitle,
+	 ToastTitle,
-	 ToastViewport } from '@/components/ui/toast'
+	 ToastViewport } from '@/components/ui/toast'
-
+
-
+
-export const Toaster = () => {
+export const Toaster = () => {
-  const { toasts } = useToast ()
+  const { toasts } = useToast ()
-
+
-  return (
+  return (
-    <ToastProvider>
+    <ToastProvider>
-      {toasts.map (({ id, title, description, action, ...props }) => (
+      {toasts.map (({ id, title, description, action, ...props }) => (
-	  <Toast key={id}
+	  <Toast key={id}
-		 className="bg-gray-300/80 dark:bg-gray-700/80"
+		 className="bg-gray-300/80 dark:bg-gray-700/80"
-		 {...props}>
+		 {...props}>
-	    <div className="grid gap-1">
+	    <div className="grid gap-1">
-	      {title && <ToastTitle>{title}</ToastTitle>}
+	      {title && <ToastTitle>{title}</ToastTitle>}
-	      {description && <ToastDescription>{description}</ToastDescription>}
+	      {description && <ToastDescription>{description}</ToastDescription>}
-	    </div>
+	    </div>
-	    {action}
+	    {action}
-	    <ToastClose />
+	    <ToastClose />
-	  </Toast>))}
+	  </Toast>))}
-      <ToastViewport />
+      <ToastViewport />
-    </ToastProvider>
+    </ToastProvider>
-  )
+)
-}

frontend/src/components/ui/use-toast.tsx

@@ -58,8 +58,7 @@ const addToRemoveQueue = (toastId: string) => {
     toastTimeouts.delete(toastId)
     dispatch({
       type: "REMOVE_TOAST",
-      toastId: toastId,
+      toastId: toastId})
-    })
   }, TOAST_REMOVE_DELAY)
 
   toastTimeouts.set(toastId, timeout)
@@ -69,17 +68,14 @@ export const reducer = (state: State, action: Action): State => {
   switch (action.type) {
     case "ADD_TOAST":
       return {
-        ...state,
+	...state,
-        toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT),
+	toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT)}
-      }
 
     case "UPDATE_TOAST":
       return {
-        ...state,
+	...state,
-        toasts: state.toasts.map((t) =>
+	toasts: state.toasts.map((t) =>
-          t.id === action.toast.id ? { ...t, ...action.toast } : t
+	  t.id === action.toast.id ? { ...t, ...action.toast } : t)}
-        ),
-      }
 
     case "DISMISS_TOAST": {
       const { toastId } = action
@@ -87,36 +83,31 @@ export const reducer = (state: State, action: Action): State => {
       // ! Side effects ! - This could be extracted into a dismissToast() action,
       // but I'll keep it here for simplicity
       if (toastId) {
-        addToRemoveQueue(toastId)
+	addToRemoveQueue(toastId)
       } else {
-        state.toasts.forEach((toast) => {
+	state.toasts.forEach((toast) => {
-          addToRemoveQueue(toast.id)
+	  addToRemoveQueue(toast.id)
-        })
+	})
       }
 
       return {
-        ...state,
+	...state,
-        toasts: state.toasts.map((t) =>
+	toasts: state.toasts.map((t) =>
-          t.id === toastId || toastId === undefined
+	  t.id === toastId || toastId === undefined
-            ? {
+	    ? {
-                ...t,
+		...t,
-                open: false,
+		open: false}
-              }
+	    : t)}
-            : t
-        ),
-      }
     }
     case "REMOVE_TOAST":
       if (action.toastId === undefined) {
-        return {
+	return {
-          ...state,
+	  ...state,
-          toasts: [],
+	  toasts: []}
-        }
       }
       return {
-        ...state,
+	...state,
-        toasts: state.toasts.filter((t) => t.id !== action.toastId),
+	toasts: state.toasts.filter((t) => t.id !== action.toastId)}
-      }
   }
 }
 
@@ -139,8 +130,7 @@ function toast({ ...props }: Toast) {
   const update = (props: ToasterToast) =>
     dispatch({
       type: "UPDATE_TOAST",
-      toast: { ...props, id },
+      toast: { ...props, id }})
-    })
   const dismiss = () => dispatch({ type: "DISMISS_TOAST", toastId: id })
 
   dispatch({
@@ -150,16 +140,13 @@ function toast({ ...props }: Toast) {
       id,
       open: true,
       onOpenChange: (open) => {
-        if (!open) dismiss()
+	if (!open) dismiss()
-      },
+      }}})
-    },
-  })
 
   return {
     id: id,
     dismiss,
-    update,
+    update}
-  }
 }
 
 function useToast() {
@@ -170,7 +157,7 @@ function useToast() {
     return () => {
       const index = listeners.indexOf(setState)
       if (index > -1) {
-        listeners.splice(index, 1)
+	listeners.splice(index, 1)
       }
     }
   }, [state])
@@ -178,8 +165,7 @@ function useToast() {
   return {
     ...state,
     toast,
-    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId }),
+    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId })}
-  }
 }
 
 export { useToast, toast }

frontend/src/config.sample.ts

@@ -3,8 +3,7 @@ const ENV: string = 'development'
 
 const config = {
   API_BASE_URL: ENV === 'production' ? 'https://hub.nizika.monster/api' : 'http://localhost:3002',
-  SITE_TITLE:   'ぼざクリ タグ広場'
+  SITE_TITLE:   'ぼざクリ タグ広場'}
-}
 
 export const API_BASE_URL = config.API_BASE_URL
 export const SITE_TITLE = config.SITE_TITLE

frontend/src/consts.ts

@@ -10,8 +10,7 @@ export const CATEGORIES = [
     'general',
     'material',
     'meta',
-    'nico',
+    'nico'] as const
-    ] as const
 
 export const CATEGORY_NAMES: Record<Category, string> = {
     deerjikist: 'ニジラー',
@@ -20,16 +19,14 @@ export const CATEGORY_NAMES: Record<Category, string> = {
     general:    '一般',
     material:   '素材',
     meta:       'メタタグ',
-    nico:       'ニコニコタグ',
+    nico:       'ニコニコタグ'} as const
-    } as const
 
 export const FETCH_POSTS_ORDER_FIELDS = [
     'title',
     'url',
     'original_created_at',
     'created_at',
-    'updated_at',
+    'updated_at'] as const
-    ] as const
 
 export const PLATFORMS = ['nico', 'youtube'] as const
 
@@ -43,13 +40,11 @@ export const TAG_COLOUR = {
     general:    'cyan',
     material:   'orange',
     meta:       'yellow',
-    nico:       'gray',
+    nico:       'gray'} as const satisfies Record<Category, string>
-    } as const satisfies Record<Category, string>
 
 export const USER_ROLES = ['admin', 'member', 'guest'] as const
 
 export const ViewFlagBehavior = {
     OnShowedDetail: 1,
     OnClickedLink:  2,
-    NotAuto:        3,
+    NotAuto:        3} as const
-    } as const

frontend/src/lib/api.ts

@@ -23,8 +23,7 @@ const apiP = async <T> (
     method: 'post' | 'put' | 'patch',
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => {
-): Promise<T> => {
   const res = await client[method] (path, body ?? { }, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
@@ -34,8 +33,7 @@ const apiP = async <T> (
 
 export const apiGet = async <T> (
     path: string,
-    opt?: Opt,
+    opt?: Opt): Promise<T> => {
-): Promise<T> => {
   const res = await client.get (path, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
@@ -46,28 +44,24 @@ export const apiGet = async <T> (
 export const apiPost = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => apiP ('post', path, body, opt)
-): Promise<T> => apiP ('post', path, body, opt)
 
 
 export const apiPut = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => apiP ('put', path, body, opt)
-): Promise<T> => apiP ('put', path, body, opt)
 
 
 export const apiPatch = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
+    opt?:   Opt): Promise<T> => apiP ('patch', path, body, opt)
-): Promise<T> => apiP ('patch', path, body, opt)
 
 
 export const apiDelete = async <T = void> (
     path: string,
-    opt?: Opt,
+    opt?: Opt): Promise<T> => {
-): Promise<T> => {
   const res = await client.delete (path, withUserCode (opt))
   if (res.data == null || res.data === '')
     return undefined as T

frontend/src/lib/gekanator.ts

@@ -104,8 +104,7 @@ export type BuildGekanatorQuestionsOptions = {
 
 
 export const normalizeTitleLengthCondition = (
-    condition:  GekanatorQuestionCondition,
+    condition:  GekanatorQuestionCondition): GekanatorQuestionCondition => {
-): GekanatorQuestionCondition => {
   switch (condition.type)
   {
   case 'title-length-greater-than':
@@ -119,8 +118,7 @@ export const normalizeTitleLengthCondition = (
 
 
 export const titleLengthMinimumForCondition = (
-    condition:  GekanatorQuestionCondition,
+    condition:  GekanatorQuestionCondition): number | null => {
-): number | null => {
   switch (condition.type)
   {
   case 'title-length-at-least':
@@ -134,8 +132,7 @@ export const titleLengthMinimumForCondition = (
 
 
 export const questionIdForCondition = (
-    condition:  NonPostSimilarityCondition,
+    condition:  NonPostSimilarityCondition): string => {
-): string => {
   switch (condition.type)
   {
   case 'tag':
@@ -161,8 +158,7 @@ export const questionIdForCondition = (
 
 const directExampleAnswerFor = (
     question:  StoredGekanatorQuestion,
-    post:      Post,
+    post:      Post): GekanatorAnswerValue | null => {
-): GekanatorAnswerValue | null => {
   if (question.kind !== 'post_similarity' && question.kind !== 'tag')
     return null
 
@@ -178,15 +174,13 @@ const directExampleAnswerFor = (
 
 
 export const isLearnedSemanticQuestion = (
-    question:  StoredGekanatorQuestion | GekanatorQuestion,
+    question:  StoredGekanatorQuestion | GekanatorQuestion): boolean =>
-): boolean =>
     question.kind === 'post_similarity'
     && question.source === 'user_suggested'
 
 
 export const learnedSemanticSideForAnswer = (
-    answer:  GekanatorAnswerValue | null,
+    answer:  GekanatorAnswerValue | null): LearnedSemanticSide => {
-): LearnedSemanticSide => {
   if (answer === 'yes' || answer === 'partial')
     return 'positive'
 
@@ -314,8 +308,7 @@ const questionableTag = (post: Post, key: string): boolean => {
 
 const questionMatches = (
     post:       Post,
-    question:   StoredGekanatorQuestion,
+    question:   StoredGekanatorQuestion): boolean => {
-): boolean => {
   const directAnswer = directExampleAnswerFor (question, post)
   if (directAnswer)
     return question.kind === 'post_similarity'
@@ -350,8 +343,7 @@ const questionMatches = (
 
 export const expectedAnswerForQuestion = (
     question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
+    post:      Post | null): GekanatorAnswerValue | null => {
-): GekanatorAnswerValue | null => {
   if (!(question) || !(post))
     return null
 
@@ -382,14 +374,12 @@ export const expectedAnswerForQuestion = (
 
 export const learnedSemanticSideForPost = (
     question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
+    post:      Post | null): LearnedSemanticSide =>
-): LearnedSemanticSide =>
     learnedSemanticSideForAnswer (expectedAnswerForQuestion (question, post))
 
 
 export const restoreGekanatorQuestion = (
-    question:  StoredGekanatorQuestion,
+    question:  StoredGekanatorQuestion): GekanatorQuestion => {
-): GekanatorQuestion => {
   const normalizedCondition = normalizeTitleLengthCondition (question.condition)
   const normalizedQuestion = {
       ...question,
@@ -408,8 +398,7 @@ export const restoreGekanatorQuestion = (
 
 
 export const storeGekanatorQuestion = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): StoredGekanatorQuestion => ({
-): StoredGekanatorQuestion => ({
   id: question.condition.type === 'title-length-greater-than'
       ? `title:length-at-least:${ question.condition.length + 1 }`
       : question.id,
@@ -436,8 +425,7 @@ export const fetchGekanatorQuestions = async (): Promise<StoredGekanatorQuestion
 
 export const fetchGekanatorExtraQuestions = async (
     gameId:  number,
-    nonce?: string,
+    nonce?: string): Promise<GekanatorExtraQuestion[]> => {
-): Promise<GekanatorExtraQuestion[]> => {
   const data = await apiGet<{ questions: GekanatorExtraQuestion[] }> (
       `/gekanator/games/${ gameId }/extra_questions`,
       { params: nonce ? { nonce } : undefined })
@@ -447,8 +435,7 @@ export const fetchGekanatorExtraQuestions = async (
 
 export const buildGekanatorQuestions = (
     posts:    Post[],
-    options:  BuildGekanatorQuestionsOptions = { },
+    options:  BuildGekanatorQuestionsOptions = { }): GekanatorQuestion[] => {
-): GekanatorQuestion[] => {
   const {
       includeTitleContains = true,
       tagQuestionCap = 192,
@@ -490,8 +477,7 @@ export const buildGekanatorQuestions = (
 
   const usefulEntries = <T extends string | number> (
       counts:  Map<T, number>,
-      cap:     number,
+      cap:     number) =>
-  ) =>
       [...counts.entries ()]
       .filter (([, count]) => count > 0 && count < posts.length)
       .sort ((a, b) => Math.abs (posts.length / 2 - a[1])

frontend/src/lib/gekanatorCandidateRecovery.ts

@@ -32,8 +32,7 @@ export const candidatePostsFor = (
 				   answers:                 GekanatorAnswerLog[]
 				   softenedQuestionIds:     Set<string>
 				   rejectedPostIds:         Set<number>
-				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> },
+				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> }): Post[] => {
-): Post[] => {
   const questionById = new Map (questions.map (question => [question.id, question]))
 
   return posts.filter (post => {
@@ -76,8 +75,7 @@ export const candidatePostsFor = (
 export const hardFilteredPostsForAnswer = (
     { posts, question, answer }: { posts:     Post[]
 				   question:  GekanatorQuestion
-				   answer:    GekanatorAnswerValue },
+				   answer:    GekanatorAnswerValue }): Post[] => {
-): Post[] => {
   if (!(questionSupportsAnswerBasedHardFiltering (question)))
     return posts
 
@@ -98,8 +96,7 @@ const concreteAnswerOptions: GekanatorAnswerValue[] = ['yes', 'no', 'partial', '
 
 export const allConcreteAnswerOptionsExhausted = (
     posts:      Post[],
-    question:   GekanatorQuestion | null,
+    question:   GekanatorQuestion | null): boolean => {
-): boolean => {
   if (!(question))
     return false
 
@@ -125,8 +122,7 @@ export const recoverCandidatePosts = (
 			     recoveredCandidatePosts: Map<number, RecoveredCandidateState>
 			     eligiblePostIds:         Set<number>
 			     answerCountAtRecovery:   number
-			     recoveryStepCount:       number },
+			     recoveryStepCount:       number }): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
-): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
      recoveryStepCount:       number } | null => {
   const recovered = new Map (recoveredCandidatePosts)
   const targetSize = nextRecoveryTargetSize (recoveryStepCount)

frontend/src/lib/gekanatorQuestionFilters.ts

@@ -8,8 +8,7 @@ import type {
 
 
 export const monthForCondition = (
-    condition:  GekanatorQuestion['condition'],
+    condition:  GekanatorQuestion['condition']): number | null => {
-): number | null => {
   if (condition.type === 'original-month')
     return condition.month
 
@@ -24,8 +23,7 @@ export const monthForCondition = (
 const isTitleLengthContradiction = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   const candidateLength = titleLengthMinimumForCondition (candidate)
   const previousLength = titleLengthMinimumForCondition (previous)
   if (candidateLength === null || previousLength === null)
@@ -45,8 +43,7 @@ const isTitleLengthContradiction = (
 
 const isQuestionRedundantAfterAnswers = (
     question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
+    answers:   GekanatorAnswerLog[]): boolean => answers.some (answer => {
-): boolean => answers.some (answer => {
   const previous = answer.questionCondition
   return previous !== undefined
       && isTitleLengthContradiction (question.condition, previous, answer.answer)
@@ -56,8 +53,7 @@ const isQuestionRedundantAfterAnswers = (
 const isSourceFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   if (candidate.type !== 'source' || previous.type !== 'source')
     return false
 
@@ -76,8 +72,7 @@ const isSourceFactBlocked = (
 const isOriginalYearFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   if (candidate.type !== 'original-year' || previous.type !== 'original-year')
     return false
 
@@ -96,8 +91,7 @@ const isOriginalYearFactBlocked = (
 const isOriginalMonthFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   switch (answer)
   {
   case 'yes':
@@ -143,8 +137,7 @@ const isOriginalMonthFactBlocked = (
 const isFactQuestionBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
+    answer:     GekanatorAnswerValue): boolean => {
-): boolean => {
   if (!(answer === 'yes' || answer === 'no'))
     return false
 
@@ -156,8 +149,7 @@ const isFactQuestionBlocked = (
 
 export const isQuestionHardFilteredAfterAnswers = (
     question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
+    answers:   GekanatorAnswerLog[]): boolean => answers.some (answer => {
-): boolean => answers.some (answer => {
   const previous = answer.questionCondition
   if (previous === undefined)
     return false

frontend/src/lib/materials.ts

@@ -0,0 +1,107 @@
+import {
+    apiGet,
+    isApiError,
+    apiPatch,
+    apiPost,
+    apiPut,
+} from '@/lib/api'
+
+import type {
+    Material,
+    FetchMaterialsParams,
+    MaterialFilter,
+    MaterialSidebarTag,
+    MaterialTagTree,
+} from '@/types'
+
+export type FetchMaterialTreeParams = {
+    parentId?:       number | null
+    materialFilter:  MaterialFilter
+}
+
+export type MaterialIndexResponse = {
+    materials: Material[]
+    count:     number
+}
+
+const MATERIAL_FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
+
+
+export const parseMaterialFilter = (
+    value: unknown,
+    fallback: MaterialFilter = 'present'): MaterialFilter =>
+    typeof value === 'string' && MATERIAL_FILTERS.includes (value as MaterialFilter)
+    ? value as MaterialFilter
+    : fallback
+
+
+export const fetchMaterials = async (
+    { q, tagState, mediaKind, suppression, createdFrom, createdTo,
+      updatedFrom, updatedTo, sort, direction, page, limit }: FetchMaterialsParams): Promise<MaterialIndexResponse> =>
+    await apiGet ('/materials', { params: {
+	...(q && { q }),
+	tag_state:   tagState,
+	media_kind:  mediaKind,
+	suppression,
+	...(createdFrom && { created_from: createdFrom }),
+	...(createdTo && { created_to: createdTo }),
+	...(updatedFrom && { updated_from: updatedFrom }),
+	...(updatedTo && { updated_to: updatedTo }),
+	sort,
+	direction,
+	page,
+	limit} })
+
+
+export const fetchMaterial = async (id: string): Promise<Material | null> => {
+  try
+  {
+    return await apiGet (`/materials/${ id }`)
+  }
+  catch (error)
+  {
+    if (isApiError (error) && error.response?.status === 404)
+      return null
+    throw error
+  }
+}
+
+
+export const fetchMaterialTagTree = async (
+    { parentId, materialFilter }: FetchMaterialTreeParams): Promise<MaterialSidebarTag[]> =>
+    await apiGet ('/tags/with-depth', { params: {
+	...(parentId != null && { parent: String (parentId) }),
+	material_filter: materialFilter} })
+
+
+export const fetchMaterialTagByName = async (
+    name: string,
+    materialFilter: MaterialFilter): Promise<MaterialTagTree | null> => {
+  try
+  {
+    return await apiGet (`/tags/name/${ encodeURIComponent (name) }/materials`,
+			 { params: { material_filter: materialFilter } })
+  }
+  catch (error)
+  {
+    if (isApiError (error) && error.response?.status === 404)
+      return null
+    throw error
+  }
+}
+
+
+export const createMaterial = async (formData: FormData): Promise<Material> =>
+    await apiPost ('/materials', formData)
+
+
+export const updateMaterial = async (
+    id: string,
+    formData: FormData): Promise<Material> =>
+    await apiPut (`/materials/${ id }`, formData)
+
+
+export const suppressMaterialFile = async (
+    id: string,
+    payload: { reason: string; purge?: boolean }): Promise<Material> =>
+    await apiPatch (`/materials/${ id }/suppress_file`, payload)

frontend/src/lib/posts.ts

@@ -5,8 +5,7 @@ import type { FetchPostsParams, Post, PostVersion } from '@/types'
 
 export const fetchPosts = async (
     { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
-      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams,
+      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams): Promise<{
-): Promise<{
     posts:  Post[]
     count:  number }> =>
 	await apiGet ('/posts', { params: {
@@ -33,8 +32,7 @@ export const fetchPostChanges = async (
 	post?:  string
 	tag?:   string
 	page:   number
-	limit:  number },
+	limit:  number }): Promise<{
-): Promise<{
     versions: PostVersion[]
     count:    number }> =>
 	await apiGet ('/posts/versions', { params: { ...(post && { post }),
@@ -52,8 +50,7 @@ export const updatePost = async (
     { baseVersionNo, force, merge }: {
 	baseVersionNo?: number
 	force?:         boolean
-	merge?:         boolean }
+	merge?:         boolean }) =>
-) =>
     await apiPut<Post> (
 	`/posts/${ post.id }`,
 	{ title: post.title,

frontend/src/lib/queryKeys.ts

@@ -1,4 +1,10 @@
-import type { FetchNicoTagsParams, FetchPostsParams, FetchTagsParams } from '@/types'
+import type {
+    FetchNicoTagsParams,
+    FetchMaterialsParams,
+    FetchPostsParams,
+    FetchTagsParams,
+    MaterialFilter,
+} from '@/types'
 
 export const postsKeys = {
     root:     ['posts'] as const,
@@ -25,6 +31,19 @@ export const tagsKeys = {
 		      ['tags', 'changes', p] as const,
     deerjikists:  (id: string) => ['tags', 'deerjikists', id] as const }
 
+export const materialsKeys = {
+    root:         ['materials'] as const,
+    index:        (p: FetchMaterialsParams) => ['materials', 'index', p] as const,
+    byTagName:     (name: string, materialFilter: MaterialFilter) =>
+		      ['materials', 'tag', name, materialFilter] as const,
+    show:         (id: string) => ['materials', id] as const,
+    tree:         (p: {
+	parentId?:       number | null
+	materialFilter:  MaterialFilter
+    }) => ['materials', 'tree', p] as const,
+    unclassified: (p: { page?: number; limit?: number } = { }) =>
+		      ['materials', 'unclassified', p] as const}
+
 export const wikiKeys = {
     root:   ['wiki'] as const,
     index:  (p: { title?: string }) => ['wiki', 'index', p] as const,

frontend/src/lib/tags.ts

@@ -11,8 +11,7 @@ import type { Deerjikist,
 export const fetchTags = async (
     { post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
       updatedFrom, updatedTo, deprecated,
-      page, limit, order }: FetchTagsParams,
+      page, limit, order }: FetchTagsParams): Promise<{ tags:  Tag[]
-): Promise<{ tags:  Tag[]
 	     count: number }> =>
     await apiGet ('/tags', { params: {
 	...(post != null && { post }),
@@ -31,8 +30,7 @@ export const fetchTags = async (
 
 
 export const fetchNicoTags = async (
-    { name, linkedTag, linkStatus, page, limit, order }: FetchNicoTagsParams,
+    { name, linkedTag, linkStatus, page, limit, order }: FetchNicoTagsParams): Promise<{ tags:  NicoTag[]
-): Promise<{ tags:  NicoTag[]
 	     count: number }> =>
     await apiGet ('/tags/nico', { params: {
 	page,
@@ -70,14 +68,12 @@ export const fetchTagChanges = async (
     { id, page, limit }: {
 	id?:    string
 	page:   number
-	limit:  number },
+	limit:  number }): Promise<{
-): Promise<{
     versions: TagVersion[]
     count:    number }> =>
 	await apiGet ('/tags/versions', { params: { ...(id && { id }), page, limit } })
 
 
 export const fetchDeerjikistsByTag = async (
-    id: string,
+    id: string): Promise<{ tag: Tag; deerjikists: Deerjikist[] }> =>
-): Promise<{ tag: Tag; deerjikists: Deerjikist[]}> =>
     await apiGet (`/tags/${ id }/deerjikists`)

frontend/src/lib/users.ts

@@ -4,5 +4,4 @@ const CONTENT_EDITOR_ROLES: readonly UserRole[] = ['admin', 'member']
 
 
 export const canEditContent = (
-    user: Pick<User, 'role'> | null | undefined,
+    user: Pick<User, 'role'> | null | undefined): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)
-): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)

frontend/src/lib/utils.ts

@@ -12,8 +12,7 @@ export const cn = (...inputs: ClassValue[]) => twMerge (clsx (...inputs))
 
 export const dateString = (
     d:        string | Date,
-    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null,
+    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null): string =>
-): string =>
     toDate (d).toLocaleString (
 	'ja-JP-u-ca-japanese',
 	{ era: 'long',
@@ -28,8 +27,7 @@ export const dateString = (
 
 export const originalCreatedAtString = (
     f:  string | Date | null,
-    b:  string | Date | null,
+    b:  string | Date | null): string => {
-): string => {
   const from = f ? toDate (f) : null
   const before = b ? toDate (b) : null
 

frontend/src/lib/wiki.ts

@@ -4,22 +4,19 @@ import type { WikiPage } from '@/types'
 
 
 export const fetchWikiPages = async (
-    { title }:  { title?: string },
+    { title }:  { title?: string }): Promise<WikiPage[]> =>
-): Promise<WikiPage[]> =>
     await apiGet ('/wiki', { params: { title } })
 
 
 export const fetchWikiPage = async (
     id:           string,
-    { version }:  { version?: string },
+    { version }:  { version?: string }): Promise<WikiPage> =>
-): Promise<WikiPage> =>
     await apiGet (`/wiki/${ id }`, { params: version ? { version } : { } })
 
 
 export const fetchWikiPageByTitle = async (
     title:        string,
-    { version }:  { version?: string },
+    { version }:  { version?: string }): Promise<WikiPage | null> => {
-): Promise<WikiPage | null> => {
   try
   {
     return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { params: { version } })

frontend/src/pages/GekanatorPage.tsx

@@ -238,8 +238,7 @@ const createGameSeed = (): string => {
 
 const normalizeStoredQuestionId = (
     questionId:  string,
-    condition?:  GekanatorQuestionCondition,
+    condition?:  GekanatorQuestionCondition): string => {
-): string => {
   if (condition?.type === 'title-length-greater-than')
     return `title:length-at-least:${ condition.length + 1 }`
 
@@ -312,8 +311,7 @@ const sourcePriorityForMerge = (question: GekanatorQuestion): number => {
 
 const shouldReplaceMergedQuestion = (
     current:    GekanatorQuestion | undefined,
-    candidate:  GekanatorQuestion,
+    candidate:  GekanatorQuestion): boolean => {
-): boolean => {
   if (!(current))
     return true
 
@@ -408,8 +406,7 @@ const loadRecentGames = (): RecentGameSummary[] => {
 
 
 const storeRecentGameSummary = (
-    summary:  RecentGameSummary,
+    summary:  RecentGameSummary): RecentGameSummary[] => {
-): RecentGameSummary[] => {
   const next =
       [summary,
        ...loadRecentGames ().filter (item => (item.savedAt !== summary.savedAt
@@ -459,8 +456,7 @@ const resettableExtraQuestionState = (): {
 
 const recoveredCandidateMapFromStored = (
     items:   RecoveredCandidatePost[],
-    scores:  [number, number][],
+    scores:  [number, number][]): Map<number, RecoveredCandidateState> => {
-): Map<number, RecoveredCandidateState> => {
   const storedScores = new Map (scores)
 
   return new Map (items.map (item => [item.postId, {
@@ -470,8 +466,7 @@ const recoveredCandidateMapFromStored = (
 
 
 const storedRecoveredCandidatesFromMap = (
-    recoveredCandidatePosts: Map<number, RecoveredCandidateState>,
+    recoveredCandidatePosts: Map<number, RecoveredCandidateState>): RecoveredCandidatePost[] =>
-): RecoveredCandidatePost[] =>
     [...recoveredCandidatePosts.entries ()]
     .map (([postId, recoveredCandidate]) => ({
 	postId,
@@ -513,8 +508,7 @@ const distributionEntropy = (weights: number[]): number =>
 const questionCategoryPenalty = (
     question:       GekanatorQuestion,
     answerCount:    number,
-    repeatPenalty:  number,
+    repeatPenalty:  number): number => {
-): number => {
   const earlyFactor = Math.max (0, (3 - answerCount) / 3)
   const titleLengthPenalty = (() => {
     if (titleLengthMinimumForCondition (question.condition) == null)
@@ -553,8 +547,7 @@ const relatedPostIdsOf = (post: Post): number[] => {
 
 const userPriorWeightsFor = (
     posts:        Post[],
-    recentGames:  RecentGameSummary[],
+    recentGames:  RecentGameSummary[]): Map<number, number> => {
-): Map<number, number> => {
   const postById = new Map (posts.map (post => [post.id, post]))
   const weights = new Map<number, number> ()
   const addWeight = (postId: number, weight: number) => {
@@ -581,14 +574,12 @@ const userPriorWeightsFor = (
 
 const answerWeightFor = (
     questionId:           string,
-    softenedQuestionIds:  Set<string>,
+    softenedQuestionIds:  Set<string>): number => softenedQuestionIds.has (questionId) ? softenedAnswerWeight : 1
-): number => softenedQuestionIds.has (questionId) ? softenedAnswerWeight : 1
 
 
 const scoreWeightForAnswer = (
     answer:               GekanatorAnswerLog,
-    softenedQuestionIds:  Set<string>,
+    softenedQuestionIds:  Set<string>): number =>
-): number =>
     answerWeightFor (answer.questionId, softenedQuestionIds)
     * (
 	answer.questionPurpose === 'learning_user_suggested'
@@ -638,8 +629,7 @@ const titleTermPattern =
 const addPostIdToIndex = <K extends string | number> (
     index:   Map<K, Set<number>>,
     key:     K,
-    postId:  number,
+    postId:  number) => {
-) => {
   const current = index.get (key)
   if (current)
     {
@@ -652,8 +642,7 @@ const addPostIdToIndex = <K extends string | number> (
 
 
 const buildMaterialIndex = (
-    posts:  Post[],
+    posts:  Post[]): GekanatorQuestionMaterialIndex => {
-): GekanatorQuestionMaterialIndex => {
   const postById = new Map<number, Post> ()
   const tagKeysByPostId = new Map<number, string[]> ()
   const postIdsByTagKey = new Map<string, Set<number>> ()
@@ -784,8 +773,7 @@ const originalDateQuestionTextFor = (
     condition:  Extract<
 	GekanatorQuestionCondition,
 	{ type: 'original-year' | 'original-month' | 'original-month-day' }
-    >,
+    >): string => {
-): string => {
   switch (condition.type)
   {
   case 'original-year':
@@ -852,8 +840,7 @@ const isLearnableTagKey = (key: string): boolean => !(key.startsWith ('nico:'))
 
 
 const isUserSuggestedLearnedSemanticQuestion = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): boolean => isLearnedSemanticQuestion (question)
-): boolean => isLearnedSemanticQuestion (question)
 
 
 type LearnedSemanticCandidateStats = {
@@ -872,8 +859,7 @@ const learnedSemanticStatsForCandidateIds = (
       question }: {
 	candidateIds:  number[]
 	posts:         Post[]
-	question:      GekanatorQuestion },
+	question:      GekanatorQuestion }): LearnedSemanticCandidateStats => {
-): LearnedSemanticCandidateStats => {
   const candidateIdSet = new Set (candidateIds)
   const positiveIds = new Set<number> ()
   const negativeIds = new Set<number> ()
@@ -915,8 +901,7 @@ const learnedSemanticQuestionIsEffectiveForCandidateIds = (
       question }: {
 	candidateIds:  number[]
 	posts:         Post[]
-	question:      GekanatorQuestion },
+	question:      GekanatorQuestion }): boolean => {
-): boolean => {
   if (!(isUserSuggestedLearnedSemanticQuestion (question)))
     return false
 
@@ -936,8 +921,7 @@ const learnedSemanticQuestionIsEffectiveForCandidateIds = (
 
 const directSemanticAnswerForPost = (
     question:  GekanatorQuestion,
-    post:      Post,
+    post:      Post): GekanatorAnswerValue | null => {
-): GekanatorAnswerValue | null => {
   const direct = question.exampleAnswers?.[String (post.id) as `${ number }`]
   if (direct)
     return direct
@@ -956,8 +940,7 @@ const learnedSemanticLearningValueForTopPosts = (
 	question:      GekanatorQuestion
 	learningTargetPosts: Post[]
 	candidateIds:  number[]
-	posts:         Post[] },
+	posts:         Post[] }): { missingTopCount: number
-): { missingTopCount: number
      knownCount:      number
      hasLearningValue: boolean } => {
   const missingTopCount =
@@ -1000,8 +983,7 @@ const learningTargetPostsForCandidates = ({
 
 
 const questionPurposeCountsFor = (
-    answers:  GekanatorAnswerLog[],
+    answers:  GekanatorAnswerLog[]): {
-): {
     effectiveUserSuggestedCount: number
     learningUserSuggestedCount:  number
     normalQuestionCount:         number
@@ -1041,8 +1023,7 @@ const questionPurposeCountsFor = (
 
 const learnedSemanticNarrowPenaltyForStats = (
     candidateCount:  number,
-    stats:           LearnedSemanticCandidateStats,
+    stats:           LearnedSemanticCandidateStats): number => {
-): number => {
   const minSide = candidateCount < 10 ? 1 : Math.max (3, candidateCount * .08)
   return stats.positiveCount < minSide || stats.negativeCount < minSide ? .15 : 0
 }
@@ -1050,8 +1031,7 @@ const learnedSemanticNarrowPenaltyForStats = (
 
 const learnedSemanticScoreDeltaForExpectedAnswer = (
     userAnswer:      GekanatorAnswerValue,
-    expectedAnswer:  GekanatorAnswerValue | null,
+    expectedAnswer:  GekanatorAnswerValue | null): number => {
-): number => {
   switch (userAnswer)
   {
   case 'yes':
@@ -1089,8 +1069,7 @@ const learnedSemanticScoreDeltaForExpectedAnswer = (
 const scoreDropDeltaForRecoveredPost = (
     postId:                   number,
     totalScore:               number,
-    recoveredCandidatePosts:  Map<number, RecoveredCandidateState>,
+    recoveredCandidatePosts:  Map<number, RecoveredCandidateState>): number => {
-): number => {
   const recoveredCandidate = recoveredCandidatePosts.get (postId)
   if (recoveredCandidate == null)
     return totalScore
@@ -1114,8 +1093,7 @@ const postPassesScoreDrop = (
       recoveredCandidatePosts }: {
 	postId:                   number
 	scores:                   Map<number, number>
-	recoveredCandidatePosts:  Map<number, RecoveredCandidateState> },
+	recoveredCandidatePosts:  Map<number, RecoveredCandidateState> }): boolean => {
-): boolean => {
   if (!(activeCandidateScoreDropEnabled (scores)))
     return true
 
@@ -1129,8 +1107,7 @@ const postPassesScoreDrop = (
 
 // `post_similarities` is the score-propagation graph, not the question kind.
 const questionUsesPostSimilarityPropagationGraphForScoring = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): boolean =>
-): boolean =>
     (question.kind === 'post_similarity'
      && !(isUserSuggestedLearnedSemanticQuestion (question)))
       || (question.kind === 'tag'
@@ -1139,8 +1116,7 @@ const questionUsesPostSimilarityPropagationGraphForScoring = (
 
 
 const questionSupportsAnswerBasedHardFiltering = (
-    question:  GekanatorQuestion,
+    question:  GekanatorQuestion): boolean => !(questionUsesPostSimilarityPropagationGraphForScoring (question))
-): boolean => !(questionUsesPostSimilarityPropagationGraphForScoring (question))
     && !(isUserSuggestedLearnedSemanticQuestion (question))
 
 
@@ -1160,8 +1136,7 @@ const usesLearnedTagExamples = (question: GekanatorQuestion): boolean =>
 
 const searchedQuestionsFor = (
     questions:  GekanatorQuestion[],
-    search:     string,
+    search:     string): GekanatorQuestion[] => {
-): GekanatorQuestion[] => {
   const needle = search.trim ()
   if (!(needle))
     return []
@@ -1235,8 +1210,7 @@ type QuestionMatchResolver = {
 
 const buildGekanatorMatchIndex = (
     posts:      Post[],
-    questions:  GekanatorQuestion[],
+    questions:  GekanatorQuestion[]): GekanatorMatchIndex => new Map (
-): GekanatorMatchIndex => new Map (
     questions.map (question => [
 	question.id,
 	new Set (
@@ -1285,8 +1259,7 @@ const matchingPostIdsForQuestion = ({
 
 
 const positiveMatchingPostIdsForQuestion = (
-    resolver:  QuestionMatchResolver,
+    resolver:  QuestionMatchResolver): Set<number> => {
-): Set<number> => {
   if (isUserSuggestedLearnedSemanticQuestion (resolver.question))
     {
       const cached = resolver.dynamicMatchIndex?.get (resolver.question.id)
@@ -1356,8 +1329,7 @@ const matchingWeightInCandidates = (
 			     materialIndex:       GekanatorQuestionMaterialIndex
 			     matchIndex:          GekanatorMatchIndex
 			     question:            GekanatorQuestion
-			     dynamicMatchIndex?:  GekanatorMatchIndex },
+			     dynamicMatchIndex?:  GekanatorMatchIndex }): number => {
-): number => {
   const matched = positiveMatchingPostIdsForQuestion ({
       posts,
       materialIndex,
@@ -1380,8 +1352,7 @@ const signatureForCandidateIds = (
 			      materialIndex:      GekanatorQuestionMaterialIndex
 			      matchIndex:         GekanatorMatchIndex
 			      question:           GekanatorQuestion
-			      dynamicMatchIndex?: GekanatorMatchIndex },
+			      dynamicMatchIndex?: GekanatorMatchIndex }): string => {
-): string => {
   if (isUserSuggestedLearnedSemanticQuestion (question))
     {
       const postById = new Map (posts.map (post => [post.id, post]))
@@ -1421,8 +1392,7 @@ const postIdsForHardAnswer = (
 			     posts:               Post[]
 			     materialIndex:       GekanatorQuestionMaterialIndex
 			     matchIndex:          GekanatorMatchIndex
-			     dynamicMatchIndex?:  GekanatorMatchIndex },
+			     dynamicMatchIndex?:  GekanatorMatchIndex }): number[] => {
-): number[] => {
   if (!(questionSupportsAnswerBasedHardFiltering (question)))
     return candidateIds
 
@@ -1562,8 +1532,7 @@ const buildIndexedQuestion = (
 	text:           string
 	kind:           GekanatorQuestionKind
 	priorityWeight: number
-	materialIndex:  GekanatorQuestionMaterialIndex },
+	materialIndex:  GekanatorQuestionMaterialIndex }): GekanatorQuestion => ({
-): GekanatorQuestion => ({
     id: questionIdForCondition (condition),
     text,
     kind,
@@ -1578,8 +1547,7 @@ const buildIndexedQuestion = (
 const rankedEntriesForCounts = <T extends string | number> (
     { counts, total, cap }: { counts:  Map<T, number>
 			      total:   number
-    			      cap:     number },
+    			      cap:     number }): [T, number][] =>
-): [T, number][] =>
     ([...counts.entries ()]
      .filter (([, count]) => count > 0 && count < total)
      .sort ((a, b) => Math.abs (total / 2 - a[1]) - Math.abs (total / 2 - b[1]))
@@ -1594,8 +1562,7 @@ const buildQuestionsForCandidateIds = (
 				     materialIndex:     GekanatorQuestionMaterialIndex
 				     acceptedQuestions: GekanatorQuestion[]
 				     mode?:            QuestionBuildMode
-				     confirmationPostId?: number | null },
+				     confirmationPostId?: number | null }): GekanatorQuestion[] => {
-): GekanatorQuestion[] => {
   const total = candidateIds.length
   const confirmationPost = (() => {
     if (confirmationPostId == null)
@@ -1652,8 +1619,7 @@ const buildQuestionsForCandidateIds = (
       condition: Extract<
 	  GekanatorQuestionCondition,
 	  { type: 'original-year' | 'original-month' | 'original-month-day' }
-      >,
+      >): GekanatorQuestion => {
-  ): GekanatorQuestion => {
     const priorityWeight = (() => {
       if (condition.type === 'original-year')
 	return 1.04
@@ -1673,8 +1639,7 @@ const buildQuestionsForCandidateIds = (
   const specialMonthDays = rankedEntriesForCounts ({
       counts: monthDayCounts,
       total,
-      cap: factCap
+      cap: factCap}).filter (([monthDay]) => specialOriginalMonthDayLabelFor (String (monthDay)) != null)
-  }).filter (([monthDay]) => specialOriginalMonthDayLabelFor (String (monthDay)) != null)
 
   if (mode === 'split')
     {
@@ -2124,8 +2089,7 @@ type ExclusiveConditionGroup =
 
 
 const exclusiveConditionGroupFor = (
-    condition:  GekanatorQuestion['condition'],
+    condition:  GekanatorQuestion['condition']): ExclusiveConditionGroup | null => {
-): ExclusiveConditionGroup | null => {
   switch (condition.type)
   {
   case 'original-month':
@@ -2144,8 +2108,7 @@ const exclusiveConditionGroupFor = (
 
 const sameConditionValue = (
     left:   GekanatorQuestion['condition'],
-    right:  GekanatorQuestion['condition'],
+    right:  GekanatorQuestion['condition']): boolean => {
-): boolean => {
   const leftTitleLength = titleLengthMinimumForCondition (left)
   const rightTitleLength = titleLengthMinimumForCondition (right)
   if (leftTitleLength != null || rightTitleLength != null)
@@ -2187,8 +2150,7 @@ const sameConditionValue = (
 
 const isMonthCrossMatch = (
     candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
+    previous:   GekanatorQuestion['condition']): boolean => {
-): boolean => {
   const candidateMonth = monthForCondition (candidate)
   const previousMonth = monthForCondition (previous)
   if (candidateMonth == null || previousMonth == null)
@@ -2204,8 +2166,7 @@ const isMonthCrossMatch = (
 
 const isExclusiveContradiction = (
     candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
+    previous:   GekanatorQuestion['condition']): boolean => {
-): boolean => {
   const candidateGroup = exclusiveConditionGroupFor (candidate)
   const previousGroup = exclusiveConditionGroupFor (previous)
 
@@ -2242,16 +2203,14 @@ const contradictionPenaltyFor = ({
     case 'no':
       if (
 	  sameConditionValue (question.condition, previous)
-	  || isMonthCrossMatch (question.condition, previous)
+	  || isMonthCrossMatch (question.condition, previous))
-      )
 	return sum + 40
 
       return sum
     case 'probably_no':
       if (
 	  sameConditionValue (question.condition, previous)
-	  || isMonthCrossMatch (question.condition, previous)
+	  || isMonthCrossMatch (question.condition, previous))
-      )
 	return sum + 20
 
       return sum
@@ -2281,8 +2240,7 @@ const chooseQuestion = (
 		      recentFirstQuestionPenaltyById: Map<string, number>
 		      userPriorWeights: Map<number, number>
 		      materialIndex: GekanatorQuestionMaterialIndex
-		      matchIndex: GekanatorMatchIndex },
+		      matchIndex: GekanatorMatchIndex }): QuestionSelection | null => {
-): QuestionSelection | null => {
   const dynamicMatchIndex = new Map<string, Set<number>> ()
 
   const invertedSignature = (signature: string): string =>
@@ -2327,8 +2285,7 @@ const chooseQuestion = (
   const rank = (
       questionsToRank:    GekanatorQuestion[],
       candidates:         { post: Post; score: number }[],
-      weightedCandidates: { post: Post; score: number; weight: number }[],
+      weightedCandidates: { post: Post; score: number; weight: number }[]) => {
-  ) => {
     const redundant = redundantSignatures (candidates.map (item => item.post))
     const candidateById = new Map (candidates.map (item => [item.post.id, item.post]))
     const candidateIds = candidates.map (item => item.post.id)
@@ -2613,8 +2570,7 @@ const chooseQuestion = (
   if (
 	effectiveRatio < targetEffectiveUserSuggestedQuestionRatio
 	&& totalUserSuggestedRatio < targetTotalUserSuggestedQuestionRatio
-	&& effectiveUserSuggestedPool.length > 0
+	&& effectiveUserSuggestedPool.length > 0)
-  )
     {
       selectedPool = effectiveUserSuggestedPool
       selectedPurpose = 'effective_user_suggested'
@@ -2622,8 +2578,7 @@ const chooseQuestion = (
   else if (
 	learningRatio < targetLearningUserSuggestedQuestionRatio
 	&& totalUserSuggestedRatio < targetTotalUserSuggestedQuestionRatio
-	&& learningUserSuggestedPool.length > 0
+	&& learningUserSuggestedPool.length > 0)
-  )
     {
       selectedPool = learningUserSuggestedPool
       selectedPurpose = 'learning_user_suggested'
@@ -2683,8 +2638,7 @@ const chooseQuestion = (
 
 
 const winningRunPriorityFor = (
-    expected:    GekanatorAnswerValue,
+    expected:    GekanatorAnswerValue): number | null => {
-): number | null => {
   if (expected === 'yes')
     return 0
   if (expected === 'partial')
@@ -2719,8 +2673,7 @@ const chooseWinningRunQuestion = ({
       materialIndex,
       acceptedQuestions,
       mode: 'confirmation',
-      confirmationPostId: targetPost.id
+      confirmationPostId: targetPost.id})
-  })
       .filter (question => {
 	if (askedIds.has (question.id))
 	  return false
@@ -2829,8 +2782,7 @@ const chooseFallbackQuestion = ({
 	  materialIndex,
 	  acceptedQuestions: [],
 	  mode: 'confirmation',
-	  confirmationPostId: post.id
+	  confirmationPostId: post.id})))
-      })))
       .slice (0, 32)
   const dynamicMatchIndex = new Map<string, Set<number>> ()
   const ranked = mergeQuestions ([
@@ -2905,8 +2857,7 @@ const chooseFallbackQuestion = ({
 
 
 const shouldEnterGuessPhase = (
-    reason: GuessReason | null,
+    reason: GuessReason | null): reason is 'hard_max_questions' | 'winning_run_finished' | 'question_count_checkpoint' =>
-): reason is 'hard_max_questions' | 'winning_run_finished' | 'question_count_checkpoint' =>
     (reason === 'hard_max_questions'
      || reason === 'winning_run_finished'
      || reason === 'question_count_checkpoint')
@@ -2914,15 +2865,13 @@ const shouldEnterGuessPhase = (
 
 const isWinningRunActive = (
     winningRunTargetId:         number | null,
-    winningRunStartAnswerCount: number | null,
+    winningRunStartAnswerCount: number | null): boolean =>
-): boolean =>
     winningRunTargetId != null && winningRunStartAnswerCount != null
 
 
 const winningRunQuestionCount = (
     answers:                    GekanatorAnswerLog[],
-    winningRunStartAnswerCount: number | null,
+    winningRunStartAnswerCount: number | null): number => {
-): number => {
   if (winningRunStartAnswerCount == null)
     return 0
 
@@ -2962,8 +2911,7 @@ const nextQuestionPlanFor = (
     				      matchIndex: GekanatorMatchIndex
     				      lastGuessQuestionCount: number
     				      winningRunTargetId: number | null
-    				      winningRunStartAnswerCount: number | null },
+    				      winningRunStartAnswerCount: number | null }): { question: GekanatorQuestion | null
-): { question: GekanatorQuestion | null
      guess: Post | null
      guessReason: GuessReason | null
      questionMode: QuestionMode
@@ -3013,8 +2961,7 @@ const nextQuestionPlanFor = (
     if (
 	isWinningRunActive (winningRunTargetId, winningRunStartAnswerCount)
 	&& winningRunTargetId === nextWinningRunTargetId
-	&& winningRunStartAnswerCount != null
+	&& winningRunStartAnswerCount != null)
-    )
       return winningRunStartAnswerCount
 
     return answers.length
@@ -3188,8 +3135,7 @@ const mascotStateFor = (
     resultWon:             boolean | null,
     eligiblePostCount:     number,
     bestConfidencePercent: number,
-    winningRunActive:      boolean,
+    winningRunActive:      boolean): MascotState => {
-): MascotState => {
   const resultPhase =
       phase === 'end'
       || phase === 'review'
@@ -3210,13 +3156,11 @@ const mascotStateFor = (
     if (
 	winningRunActive
 	|| eligiblePostCount <= 2
-	|| bestConfidencePercent >= 70
+	|| bestConfidencePercent >= 70)
-    )
       return 'thinking_near'
     if (
 	eligiblePostCount >= 15
-	&& bestConfidencePercent < 45
+	&& bestConfidencePercent < 45)
-    )
       return 'thinking_far'
     return 'thinking_mid'
   case 'guess':
@@ -3327,8 +3271,7 @@ const GekanatorBackdrop: FC<{
 
   const settingsForMode = useCallback (
       (
-	  mode: 'normal' | 'winning_run' | 'guess',
+	  mode: 'normal' | 'winning_run' | 'guess'): { columns: number; rows: number; opacity: number } => {
-      ): { columns: number; rows: number; opacity: number } => {
 	if (mode === 'winning_run' || mode === 'guess')
 	  return { columns: 8, rows: 8, opacity: motionMode === 'calm' ? .18 : .24 }
 
@@ -3342,8 +3285,7 @@ const GekanatorBackdrop: FC<{
   const scaleForMode = useCallback (
       (
 	  mode:                    'normal' | 'winning_run' | 'guess',
-	  displayedWinningCount:   number,
+	  displayedWinningCount:   number): number => {
-      ): number => {
 	if (mode === 'guess')
 	  return 8
 
@@ -3355,8 +3297,7 @@ const GekanatorBackdrop: FC<{
       [])
 
   const postsForMode = useCallback ((
-      mode: 'normal' | 'winning_run' | 'guess',
+      mode: 'normal' | 'winning_run' | 'guess'): Post[] => {
-  ): Post[] => {
     if (mode === 'guess' && displayedGuess)
       return [displayedGuess]
     if (mode === 'winning_run' && winningRunTargetPost)
@@ -3366,8 +3307,7 @@ const GekanatorBackdrop: FC<{
 
   const thumbnailsForMode = useCallback ((
       mode:      'normal' | 'winning_run' | 'guess',
-      count:     number,
+      count:     number): string[] => {
-  ): string[] => {
     const modePosts = postsForMode (mode)
     if (modePosts.length === 0)
       return []
@@ -3734,8 +3674,7 @@ const GekanatorBackdrop: FC<{
 
 const expectedAnswerFor = (
     question:     GekanatorQuestion | undefined,
-    correctPost:  Post | null,
+    correctPost:  Post | null): GekanatorAnswerValue | null =>
-): GekanatorAnswerValue | null =>
     expectedAnswerForQuestion (question, correctPost)
 
 
@@ -4169,8 +4108,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	setSaved (true)
 	setSavedGameId (data.id)
 	setLearnedExampleCount (data.learnedExampleCount)
-	setResultWon (variables.guessedPostId === variables.correctPostId)
+	setResultWon (variables.guessedPostId === variables.correctPostId)}})
-      }})
   const questionSuggestionMutation = useMutation ({
       mutationFn: saveGekanatorQuestionSuggestion,
       onSuccess: async data => {
@@ -4180,15 +4118,13 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	setQuestionSuggestionSearch ('')
 	setQuestionSuggestionSelectedId (null)
 	setQuestionSuggestion ('')
-	setQuestionSuggestionAnswer ('yes')
+	setQuestionSuggestionAnswer ('yes')}})
-      }})
   const extraQuestionAnswersMutation = useMutation ({
       mutationFn: saveGekanatorExtraQuestionAnswers,
       onSuccess: async () => {
 	await queryClient.refetchQueries ({ queryKey: gekanatorKeys.questions () })
 	setExtraQuestionState ('saved')
-	setPhase ('end')
+	setPhase ('end')}})
-      }})
 
   const resetExtraQuestionState = () => {
     const next = resettableExtraQuestionState ()
@@ -4330,8 +4266,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
       if (
 	  !(allowPreQuestionRecovery)
 	  || recoveredEligiblePosts.length === 0
-	  || recoveredEligiblePosts.length === 1
+	  || recoveredEligiblePosts.length === 1)
-      )
 	return false
 
       const nextQuestion = chooseQuestion ({
@@ -4493,8 +4428,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	!(nextPlan.question)
 	&& !(shouldEnterGuessPhase (nextPlan.guessReason))
-	&& recovered.eligiblePosts.length !== 1
+	&& recovered.eligiblePosts.length !== 1)
-    )
       {
 	const recoveredForQuestion = recoverQuestionState ({
 	    nextAnswers,
@@ -4602,8 +4536,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	!(canPersistGame)
 	|| reviewGuessedPostId == null
 	|| reviewCorrectPostId == null
-	|| saveMutation.isPending
+	|| saveMutation.isPending)
-    )
       return
 
     if (savedGameId != null)
@@ -4666,8 +4599,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	!(canPersistGame)
 	|| savedGameId == null
 	|| extraQuestionAnswersMutation.isPending
-	|| extraQuestions.some (question => !(extraQuestionAnswers[String (question.id)]))
+	|| extraQuestions.some (question => !(extraQuestionAnswers[String (question.id)])))
-    )
       return
 
     extraQuestionAnswersMutation.mutate ({
@@ -4870,8 +4802,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 
   const answerExtraQuestion = (
       questionId:  number,
-      value:       GekanatorAnswerValue,
+      value:       GekanatorAnswerValue) => {
-  ) => {
     setExtraQuestionAnswers ({
 	...extraQuestionAnswers,
 	[String (questionId)]: value })
@@ -4909,8 +4840,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	|| isLoading
 	|| acceptedQuestionsLoading
 	|| shouldEnterGuessPhase (questionPlan.guessReason)
-	|| eligiblePosts.length === 1
+	|| eligiblePosts.length === 1)
-    )
       return
 
     const recovered = recoverQuestionState ({
@@ -4926,8 +4856,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	recovered.recoveryStepCount === recoveryStepCount
 	&& recovered.recoveredCandidatePosts.size === recoveredCandidatePosts.size
-	&& recovered.softenedQuestionIds.size === softenedQuestionIds.size
+	&& recovered.softenedQuestionIds.size === softenedQuestionIds.size)
-    )
       return
 
     setSoftenedQuestionIds (recovered.softenedQuestionIds)
@@ -4954,15 +4883,13 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	phase !== 'question'
 	|| isLoading
-	|| acceptedQuestionsLoading
+	|| acceptedQuestionsLoading)
-    )
       return
 
     if (
 	currentQuestion
 	|| !(questionPlan.guess)
-	|| !(shouldEnterGuessPhase (questionPlan.guessReason))
+	|| !(shouldEnterGuessPhase (questionPlan.guessReason)))
-    )
       return
 
     setWinningRunTargetId (questionPlan.winningRunTargetId)

frontend/src/pages/deerjikists/DeerjikistDetailPage.tsx

@@ -145,8 +145,7 @@ const DeerjikistDetailPage: FC = () => {
 				  return rtn
 				})}/>)}
 		      </FormField>
-		    </fieldset>
+		    </fieldset>))}
-		))}
 
 		<div className="py-3">
 		  <button
@@ -169,8 +168,7 @@ const DeerjikistDetailPage: FC = () => {
 		  </button>
 		</div>
 	      </form>
-	    </div>
+	    </div>)}
-	)}
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialDetailPage.test.tsx

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

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -1,3 +1,4 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
@@ -13,107 +14,149 @@ import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import { apiGet, apiPut } from '@/lib/api'
+import {
+    suppressMaterialFile,
+    fetchMaterial,
+    updateMaterial,
+} from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC } from 'react'
 
-import type { Material, Tag } from '@/types'
+import type { User } from '@/types'
 
-type MaterialWithTag = Material & { tag: Tag }
+type MaterialFormField = 'tag' | 'file' | 'url' | 'exportPaths'
-
-type MaterialFormField = 'tag' | 'file' | 'url'
 
 
-const MaterialDetailPage: FC = () => {
+const MaterialDetailPage: FC<{ user: User | null }> = ({ user }) => {
   const { id } = useParams ()
+  const qc = useQueryClient ()
 
+  const [exportPath, setExportPath] = useState ('')
   const [file, setFile] = useState<File | null> (null)
   const [filePreview, setFilePreview] = useState ('')
-  const [loading, setLoading] = useState (false)
-  const [material, setMaterial] = useState<MaterialWithTag | null> (null)
-  const [sending, setSending] = useState (false)
   const [tag, setTag] = useState ('')
   const [url, setURL] = useState ('')
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<MaterialFormField> ()
 
-  const handleSubmit = async () => {
+  const { data: material, isError, isLoading } = useQuery ({
-    clearValidationErrors ()
+      queryKey: materialsKeys.show (id ?? ''),
-
+      queryFn:  () => fetchMaterial (id ?? ''),
-    const formData = new FormData
+      enabled:  id != null})
-    if (tag.trim ())
+  const materialTitle = material
-      formData.append ('tag', tag)
+      ? material.tag?.name ?? `素材 #${ material.id }`
-    if (file)
+      : ''
-      formData.append ('file', file)
-    if (url.trim ())
-      formData.append ('url', url)
-
-    try
-    {
-      setSending (true)
-      const data = await apiPut<Material> (`/materials/${ id }`, formData)
-      setMaterial (data)
-      toast ({ title: '更新成功!' })
-    }
-    catch (e)
-    {
-      applyValidationError (e)
-      toast ({ title: '更新失敗……', description: '入力を見直してください．' })
-    }
-    finally
-    {
-      setSending (false)
-    }
-  }
 
   useEffect (() => {
-    if (!(id))
+    if (!(material))
       return
 
-    void (async () => {
+    setTag (material.tag?.name ?? '')
-      try
+    setURL (material.url ?? '')
+    setExportPath (material.exportPaths.legacyDrive ?? '')
+    if (material.file && material.contentType)
       {
-	setLoading (true)
+	setFilePreview (material.file)
-	const data = await apiGet<MaterialWithTag> (`/materials/${ id }`)
+	setFile (null)
-	setMaterial (data)
-	setTag (data.tag.name)
-	if (data.file && data.contentType)
-	  {
-	    setFilePreview (data.file)
-	    setFile (new File ([await (await fetch (data.file)).blob ()],
-			       data.file,
-			       { type: data.contentType }))
-	  }
-	setURL (data.url ?? '')
       }
-      finally
+  }, [material])
-      {
+
-	setLoading (false)
+  const invalidateMaterialQueries = async () => {
-      }
+    await qc.invalidateQueries ({ queryKey: materialsKeys.root })
-    }) ()
+  }
-  }, [id])
+
+  const updateMutation = useMutation ({
+      mutationFn: async () => {
+	const formData = new FormData
+	if (tag.trim ())
+	  formData.append ('tag', tag)
+	if (file)
+	  formData.append ('file', file)
+	if (url.trim ())
+	  formData.append ('url', url)
+	formData.append ('export_paths[legacy_drive]', exportPath)
+
+	return await updateMaterial (id ?? '', formData)
+      },
+      onSuccess: async data => {
+	qc.setQueryData (materialsKeys.show (id ?? ''), data)
+	await invalidateMaterialQueries ()
+	toast ({ title: '更新成功!' })
+      },
+      onError: error => {
+	applyValidationError (error)
+	toast ({ title: '更新失敗……', description: '入力を見直してください．' })
+      }})
+
+  const suppressMutation = useMutation ({
+      mutationFn: async (reason: string) =>
+	  await suppressMaterialFile (id ?? '', { reason }),
+      onSuccess: async data => {
+	qc.setQueryData (materialsKeys.show (id ?? ''), data)
+	setFile (null)
+	setFilePreview ('')
+	await invalidateMaterialQueries ()
+	toast ({ title: '抑止しました' })
+      },
+      onError: () => {
+	toast ({ title: '抑止に失敗しました' })
+      }})
+
+  const handleSubmit = () => {
+    clearValidationErrors ()
+    updateMutation.mutate ()
+  }
+
+  const handleSuppress = () => {
+    const reason = window.prompt ('抑止理由を入力してください。')
+    if (reason == null || reason.trim () === '')
+      return
+    if (!window.confirm ('素材ファイルを抑止します。表示と ZIP export から除外されます。'))
+      return
+
+    suppressMutation.mutate (reason)
+  }
 
   return (
       <MainArea>
 	{material && (
 	    <Helmet>
-	      <title>{`${ material.tag.name } 素材照会 | ${ SITE_TITLE }`}</title>
+	      <title>{`${ materialTitle } 素材照会 | ${ SITE_TITLE }`}</title>
 	    </Helmet>)}
 
-	{loading ? 'Loading...' : (material && (
+	{isLoading ? 'Loading...' : isError ? (
+	    <p className="text-red-600 dark:text-red-300">
+	      素材の取得に失敗しました．
+	    </p>) : material == null ? (
+	    <p className="text-stone-700 dark:text-stone-300">
+	      素材が見つかりませんでした．
+	    </p>) : (
 	    <>
 	      <PageTitle>
-		<TagLink
+		{material.tag
-		    tag={material.tag}
+		 ? (
-		    withWiki={false}
+		    <TagLink
-		    withCount={false}/>
+			tag={material.tag}
+			withWiki={false}
+			withCount={false}/>)
+		 : materialTitle}
 	      </PageTitle>
 
-	      {(material.file && material.contentType) && (
+	      {material.fileSuppressedAt && (
+		  <div className="mb-4 rounded border border-red-300 bg-red-50 p-3
+				  text-red-900 dark:border-red-800 dark:bg-red-950
+				  dark:text-red-100">
+		    <span>素材ファイルは抑止済みです。</span>
+		    {material.fileSuppressionReason && (
+			<span> 理由: {material.fileSuppressionReason}</span>)}
+		  </div>)}
+
+	      {(!material.fileSuppressedAt && material.file && material.contentType) && (
 		  (/image\/.*/.test (material.contentType) && (
-		      <img src={material.file} alt={material.tag.name || undefined}/>))
+		      <img src={material.file} alt={material.tag?.name || undefined}/>))
 		  || (/video\/.*/.test (material.contentType) && (
 		      <video src={material.file} controls/>))
 		  || (/audio\/.*/.test (material.contentType) && (
@@ -121,16 +164,21 @@ const MaterialDetailPage: FC = () => {
 
 	      <TabGroup>
 		<Tab name="Wiki">
-		  <WikiBody
+		  {material.tag
-		      title={material.tag.name}
+		   ? (
-		      body={material.wikiPageBody ?? undefined}/>
+		      <WikiBody
+			  title={material.tag.name}
+			  body={material.wikiPageBody ?? undefined}/>)
+		   : (
+		      <p className="text-stone-700 dark:text-stone-300">
+			タグ未設定の素材です．
+		      </p>)}
 		</Tab>
 
 		<Tab name="編輯">
-		  <div className="max-w-wl pt-2 space-y-4">
+		  <div className="max-w-wl space-y-4 pt-2">
 		    <FieldError messages={baseErrors}/>
 
-		    {/* タグ */}
 		    <FormField label="タグ" messages={fieldErrors.tag}>
 		      {({ describedBy, invalid }) => (
 			  <TagInput
@@ -140,7 +188,6 @@ const MaterialDetailPage: FC = () => {
 			      setValue={setTag}/>)}
 		    </FormField>
 
-		    {/* ファイル */}
 		    <FormField label="ファイル" messages={fieldErrors.file}>
 		      {({ describedBy, invalid }) => (
 			  <>
@@ -150,9 +197,10 @@ const MaterialDetailPage: FC = () => {
 				aria-describedby={describedBy}
 				aria-invalid={invalid}
 				onChange={e => {
-				  const f = e.target.files?.[0]
+				  const nextFile = e.target.files?.[0]
-				  setFile (f ?? null)
+				  setFile (nextFile ?? null)
-				  setFilePreview (f ? URL.createObjectURL (f) : '')
+				  setFilePreview (
+				      nextFile ? URL.createObjectURL (nextFile) : '')
 				}}/>
 			    {(file && filePreview) && (
 				(/image\/.*/.test (file.type) && (
@@ -177,7 +225,6 @@ const MaterialDetailPage: FC = () => {
 			  </>)}
 		    </FormField>
 
-		    {/* 参考 URL */}
 		    <FormField label="参考 URL" messages={fieldErrors.url}>
 		      {({ describedBy, invalid }) => (
 			  <input
@@ -189,17 +236,39 @@ const MaterialDetailPage: FC = () => {
 			      className={inputClass (invalid)}/>)}
 		    </FormField>
 
-		    {/* 送信 */}
+		    <FormField label="ZIP 出力パス" messages={fieldErrors.exportPaths}>
-		    <Button
+		      {({ describedBy, invalid }) => (
-			onClick={handleSubmit}
+			  <input
-			className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
+			      type="text"
-			disabled={sending}>
+			      value={exportPath}
-		      更新
+			      onChange={e => setExportPath (e.target.value)}
-		    </Button>
+			      placeholder="伊地知ニジカ/表情/泣き.png"
+			      aria-describedby={describedBy}
+			      aria-invalid={invalid}
+			      className={inputClass (invalid)}/>)}
+		    </FormField>
+
+		    <div className="flex flex-wrap gap-2">
+		      <Button
+			  onClick={handleSubmit}
+			  className="rounded bg-blue-600 px-4 py-2 text-white
+				     disabled:bg-gray-400"
+			  disabled={updateMutation.isPending}>
+			更新
+		      </Button>
+		      {user?.role === 'admin' && !material.fileSuppressedAt && (
+			  <Button
+			      type="button"
+			      variant="destructive"
+			      onClick={handleSuppress}
+			      disabled={suppressMutation.isPending}>
+			    ファイルを抑止
+			  </Button>)}
+		    </div>
 		  </div>
 		</Tab>
 	      </TabGroup>
-	    </>))}
+	    </>)}
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialListPage.tsx

@@ -1,75 +1,280 @@
-import { Fragment, useEffect, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { useEffect, useMemo, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
-import { useLocation } from 'react-router-dom'
+import { useLocation, useNavigate } from 'react-router-dom'
 
 import nikumaru from '@/assets/fonts/nikumaru.otf'
 import PrefetchLink from '@/components/PrefetchLink'
-import TagLink from '@/components/TagLink'
+import DateTimeField from '@/components/common/DateTimeField'
+import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
-import SectionTitle from '@/components/common/SectionTitle'
+import Pagination from '@/components/common/Pagination'
-import SubsectionTitle from '@/components/common/SubsectionTitle'
 import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
+import { API_BASE_URL, SITE_TITLE } from '@/config'
-import { apiGet } from '@/lib/api'
+import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
+import { dateString, inputClass } from '@/lib/utils'
 
-import type { FC } from 'react'
+import type { FC, FormEvent } from 'react'
 
-import type { Material, Tag } from '@/types'
+import type {
+    FetchMaterialsParams,
+    Material,
+    MaterialIndexDirection,
+    MaterialIndexMediaKind,
+    MaterialIndexSort,
+    MaterialIndexSuppression,
+    MaterialIndexTagState,
+    MaterialIndexView } from '@/types'
 
-type TagWithMaterial = Omit<Tag, 'children'> & {
+const MEDIA_KIND_LABELS: Record<Material['mediaKind'], string> = {
-    children: TagWithMaterial[]
+    image:      '画像',
-    material: Material | null }
+    video:      '動画',
+    audio:      '音声',
+    file_other: 'その他ファイル',
+    url_only:   'URL のみ',
+    suppressed: '抑止済み'}
+
+const MEDIA_FILTER_LABELS: Record<MaterialIndexMediaKind, string> = {
+    all:        'すべて',
+    image:      '画像',
+    video:      '動画',
+    audio:      '音声',
+    file_other: 'その他ファイル',
+    url_only:   'URL のみ'}
+
+const SORT_LABELS: Record<MaterialIndexSort, string> = {
+    created_at:     '作成日時',
+    updated_at:     '更新日時',
+    tag_name:       'タグ名',
+    media_kind:     '種類',
+    file_byte_size: 'ファイルサイズ',
+    version_no:     'バージョン',
+    id:             'ID'}
 
 
-const MaterialCard = ({ tag }: { tag: TagWithMaterial }) => {
+const setIf = (qs: URLSearchParams, key: string, value: string | null) => {
-  if (!(tag.material))
+  const next = value?.trim ()
-    return
+  if (next)
-
+    qs.set (key, next)
-  return (
-      <PrefetchLink
-	  to={`/materials/${ tag.material.id }`}
-	  className="block w-40 h-40">
-	<div
-	    className="w-full h-full overflow-hidden rounded-xl shadow
-		       text-center content-center text-4xl"
-	    style={{ fontFamily: 'Nikumaru' }}>
-	  {(tag.material.contentType && /image\/.*/.test (tag.material.contentType))
-	   ? <img src={tag.material.file || undefined}/>
-	   : <span>照会</span>}
-	</div>
-      </PrefetchLink>)
 }
 
 
-const MaterialListPage: FC = () => {
+const parseOption = <T extends string> (
-  const [loading, setLoading] = useState (false)
+    value: string | null,
-  const [tag, setTag] = useState<TagWithMaterial | null> (null)
+    allowed: readonly T[],
+    fallback: T): T => allowed.includes (value as T) ? value as T : fallback
 
+
+const fileSizeText = (bytes: number | null): string => {
+  if (bytes == null)
+    return ''
+  if (bytes < 1024)
+    return `${ bytes } B`
+  if (bytes < 1024 * 1024)
+    return `${ (bytes / 1024).toFixed (1) } KB`
+  return `${ (bytes / 1024 / 1024).toFixed (1) } MB`
+}
+
+
+const materialTitle = (material: Material): string =>
+    material.tag?.name ?? `素材 #${ material.id }`
+
+
+const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
+    <div
+	className={`flex aspect-square h-[180px] w-[180px] items-center justify-center
+		    overflow-hidden rounded-lg border text-center shadow-sm ${
+		    material.fileSuppressedAt
+		    ? [
+			'border-red-300 bg-red-50 text-red-900 dark:border-red-800',
+			'dark:bg-red-950 dark:text-red-100'].join (' ')
+		    : [
+			'border-stone-200 bg-white text-stone-900 dark:border-stone-700',
+			'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+      {material.thumbnail
+       ? <img src={material.thumbnail} alt="" className="h-full w-full object-contain"/>
+       : (
+	  <span
+	      className="px-2 text-2xl leading-tight"
+	      style={{ fontFamily: material.thumbnailFallbackKind === 'tag_name'
+		  ? 'Nikumaru'
+		  : undefined }}>
+	    {material.thumbnailFallbackText}
+	  </span>)}
+    </div>)
+
+
+const MaterialCard: FC<{ material: Material }> = ({ material }) => (
+    <article className="w-[180px] justify-self-center">
+      <PrefetchLink to={`/materials/${ material.id }`} className="block">
+	<MaterialThumb material={material}/>
+	<div className="mt-2 w-[180px]">
+	  <p className="truncate text-sm font-medium text-stone-900 dark:text-stone-100">
+	    {materialTitle (material)}
+	  </p>
+	  <p className="truncate text-xs text-stone-600 dark:text-stone-300">
+	    {MEDIA_KIND_LABELS[material.mediaKind]} / {dateString (material.createdAt)}
+	  </p>
+	</div>
+      </PrefetchLink>
+    </article>)
+
+
+const MaterialListItem: FC<{ material: Material }> = ({ material }) => (
+    <article
+	className={`rounded-lg border p-3 shadow-sm ${
+		    material.fileSuppressedAt
+		    ? [
+			'border-red-200 bg-red-50 text-red-900 dark:border-red-900',
+			'dark:bg-red-950 dark:text-red-100'].join (' ')
+		    : [
+			'border-stone-200 bg-white text-stone-900 dark:border-stone-700',
+			'dark:bg-stone-900 dark:text-stone-100'].join (' ')}`}>
+      <div className="flex gap-3">
+	<MaterialThumb material={material}/>
+	<div className="min-w-0 flex-1 space-y-2">
+	  <div>
+	    <PrefetchLink
+		to={`/materials/${ material.id }`}
+		className="font-medium text-sky-700 underline underline-offset-2
+			   dark:text-sky-300">
+	      {materialTitle (material)}
+	    </PrefetchLink>
+	    {material.fileSuppressedAt && (
+		<p className="mt-1 text-sm text-red-700 dark:text-red-200">抑止済み</p>)}
+	  </div>
+	  <dl className="space-y-1 text-sm text-stone-600 dark:text-stone-300">
+	    <div>
+	      <dt className="inline">種類: </dt>
+	      <dd className="inline">{MEDIA_KIND_LABELS[material.mediaKind]}</dd>
+	    </div>
+	    {material.fileByteSize != null && (
+		<div>
+		  <dt className="inline">サイズ: </dt>
+		  <dd className="inline">{fileSizeText (material.fileByteSize)}</dd>
+		</div>)}
+	    {material.url && (
+		<div>
+		  <dt className="inline">URL: </dt>
+		  <dd className="inline break-all">{material.url}</dd>
+		</div>)}
+	    <div>
+	      <dt className="inline">作成: </dt>
+	      <dd className="inline">{dateString (material.createdAt)}</dd>
+	    </div>
+	  </dl>
+	</div>
+      </div>
+    </article>)
+
+
+const MaterialListPage: FC = () => {
   const location = useLocation ()
-  const query = new URLSearchParams (location.search)
+  const navigate = useNavigate ()
-  const tagQuery = query.get ('tag') ?? ''
+  const query = useMemo (() => new URLSearchParams (location.search), [location.search])
+  const materialFilter = parseMaterialFilter (query.get ('material_filter'), 'present')
+
+  const page = Number (query.get ('page') ?? 1)
+  const limit = Number (query.get ('limit') ?? 20)
+  const qQuery = query.get ('q') ?? query.get ('tag') ?? ''
+  const tagState = query.get ('unclassified') === '1'
+      ? 'untagged'
+      : parseOption<MaterialIndexTagState> (
+	  query.get ('tag_state'),
+	  ['all', 'tagged', 'untagged'],
+	  'all')
+  const mediaKind = parseOption<MaterialIndexMediaKind> (
+      query.get ('media_kind'),
+      ['all', 'image', 'video', 'audio', 'file_other', 'url_only'],
+      'all')
+  const suppression = parseOption<MaterialIndexSuppression> (
+      query.get ('suppression'),
+      ['active', 'suppressed', 'all'],
+      'active')
+  const sort = parseOption<MaterialIndexSort> (
+      query.get ('sort'),
+      ['created_at', 'updated_at', 'tag_name', 'media_kind', 'file_byte_size',
+       'version_no', 'id'],
+      'created_at')
+  const direction = parseOption<MaterialIndexDirection> (
+      query.get ('direction'),
+      ['asc', 'desc'],
+      'desc')
+  const view = parseOption<MaterialIndexView> (query.get ('view'), ['card', 'list'], 'card')
+  const createdFromQuery = query.get ('created_from') ?? ''
+  const createdToQuery = query.get ('created_to') ?? ''
+  const updatedFromQuery = query.get ('updated_from') ?? ''
+  const updatedToQuery = query.get ('updated_to') ?? ''
+
+  const [q, setQ] = useState ('')
+  const [tagStateInput, setTagStateInput] = useState<MaterialIndexTagState> ('all')
+  const [mediaKindInput, setMediaKindInput] = useState<MaterialIndexMediaKind> ('all')
+  const [suppressionInput, setSuppressionInput] =
+      useState<MaterialIndexSuppression> ('active')
+  const [createdFrom, setCreatedFrom] = useState<string | null> (null)
+  const [createdTo, setCreatedTo] = useState<string | null> (null)
+  const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
+  const [updatedTo, setUpdatedTo] = useState<string | null> (null)
+
+  const keys: FetchMaterialsParams = {
+      q: qQuery,
+      tagState,
+      mediaKind,
+      suppression,
+      createdFrom: createdFromQuery,
+      createdTo: createdToQuery,
+      updatedFrom: updatedFromQuery,
+      updatedTo: updatedToQuery,
+      sort,
+      direction,
+      view,
+      page,
+      limit}
+  const { data, isLoading, isError } = useQuery ({
+      queryKey: materialsKeys.index (keys),
+      queryFn:  () => fetchMaterials (keys)})
+  const materials = data?.materials ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
 
   useEffect (() => {
-    if (!(tagQuery))
+    setQ (qQuery)
-      {
+    setTagStateInput (tagState)
-	setTag (null)
+    setMediaKindInput (mediaKind)
-	return
+    setSuppressionInput (suppression)
-      }
+    setCreatedFrom (createdFromQuery)
+    setCreatedTo (createdToQuery)
+    setUpdatedFrom (updatedFromQuery)
+    setUpdatedTo (updatedToQuery)
+  }, [createdFromQuery, createdToQuery, mediaKind, qQuery, suppression, tagState,
+      updatedFromQuery, updatedToQuery])
 
-    void (async () => {
+  const search = (e: FormEvent) => {
-      try
+    e.preventDefault ()
-      {
+
-	setLoading (true)
+    const qs = new URLSearchParams ()
-	setTag (
+    setIf (qs, 'q', q)
-	    await apiGet<TagWithMaterial> (
+    qs.set ('tag_state', tagStateInput)
-		`/tags/name/${ encodeURIComponent (tagQuery) }/materials`))
+    qs.set ('media_kind', mediaKindInput)
-      }
+    qs.set ('suppression', suppressionInput)
-      finally
+    setIf (qs, 'created_from', createdFrom)
-      {
+    setIf (qs, 'created_to', createdTo)
-	setLoading (false)
+    setIf (qs, 'updated_from', updatedFrom)
-      }
+    setIf (qs, 'updated_to', updatedTo)
-    }) ()
+    qs.set ('sort', sort)
-  }, [location.search, tagQuery])
+    qs.set ('direction', direction)
+    qs.set ('view', view)
+    qs.set ('page', '1')
+    qs.set ('limit', String (limit))
+    qs.set ('material_filter', materialFilter)
+    navigate (`/materials?${ qs.toString () }`)
+  }
+
+  const updateQuery = (changes: Record<string, string>) => {
+    const qs = new URLSearchParams (location.search)
+    Object.entries (changes).forEach (([key, value]) => qs.set (key, value))
+    navigate (`/materials?${ qs.toString () }`)
+  }
 
   return (
       <MainArea>
@@ -82,86 +287,194 @@ const MaterialListPage: FC = () => {
 		  src: url(${ nikumaru }) format('opentype');
 		}`}
 	  </style>
-	  <title>{`${ tag ? `${ tag.name } 素材集` : '素材集' } | ${ SITE_TITLE }`}</title>
+	  <title>{`素材一覧 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
-	{loading ? 'Loading...' : (
+	<div className="space-y-5">
-	    tag
+	  <div className="flex flex-wrap items-center justify-between gap-3">
-	    ? (
+	    <PageTitle>素材一覧</PageTitle>
-		<>
+	    <div className="flex flex-wrap gap-2">
-		  <PageTitle>
+	      <PrefetchLink
-		    <TagLink
+		  to="/materials/new"
-			tag={tag}
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
-			withWiki={false}
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
-			withCount={false}
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-			to={tag.material
+		新規素材を追加
-			    ? `/materials/${ tag.material.id }`
+	      </PrefetchLink>
-			    : `/materials?tag=${ encodeURIComponent (tag.name) }`}/>
+	      <a
-		  </PageTitle>
+		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
-		  {(!(tag.material) && tag.category !== 'meme') && (
+		  target="_blank"
-		      <div className="-mt-2">
+		  rel="noopener noreferrer"
-			<PrefetchLink
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
-			    to={`/materials/new?tag=${ encodeURIComponent (tag.name) }`}>
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
-			  追加
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-			</PrefetchLink>
+		ZIP をダウンロード
-		      </div>)}
+	      </a>
+	    </div>
+	  </div>
 
-		  <MaterialCard tag={tag}/>
+	  {tagState === 'untagged' && (
+	      <PrefetchLink
+		  to={`/materials?material_filter=${ materialFilter }`}
+		  className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+		素材検索トップへ戻る
+	      </PrefetchLink>)}
 
-		  <div className="ml-2">
+	  <form
-		    {tag.children.map (c2 => (
+	      onSubmit={search}
-			<Fragment key={c2.id}>
+	      className="max-w-3xl rounded-lg border border-stone-200 bg-white p-4
-			  <SectionTitle>
+			 text-stone-900 dark:border-stone-700 dark:bg-stone-900
-			    <TagLink
+			 dark:text-stone-100">
-				tag={c2}
+	    <div className="space-y-3">
-				withWiki={false}
+	      <FormField label="検索">
-				withCount={false}
+		{({ invalid }) => (
-				to={`/materials?tag=${ encodeURIComponent (c2.name) }`}/>
+		    <input
-			  </SectionTitle>
+			type="search"
-			  {(!(c2.material) && c2.category !== 'meme') && (
+			value={q}
-			      <div className="-mt-4">
+			onChange={e => setQ (e.target.value)}
-				<PrefetchLink
+			placeholder="タグ名 / URL / ファイル名"
-				    to={`/materials/new?tag=${ encodeURIComponent (c2.name) }`}>
+			className={inputClass (invalid)}/>)}
-				  追加
+	      </FormField>
-				</PrefetchLink>
-			      </div>)}
 
-			  <MaterialCard tag={c2}/>
+	      <FormField label="タグ状態">
+		{({ invalid }) => (
+		    <select
+			value={tagStateInput}
+			onChange={e => setTagStateInput (
+			    e.target.value as MaterialIndexTagState)}
+			className={inputClass (invalid)}>
+		      <option value="all">すべて</option>
+		      <option value="tagged">タグあり</option>
+		      <option value="untagged">タグなし</option>
+		    </select>)}
+	      </FormField>
 
-			  <div className="ml-2">
+	      <FormField label="メディア">
-			    {c2.children.map (c3 => (
+		{({ invalid }) => (
-				<Fragment key={c3.id}>
+		    <select
-				  <SubsectionTitle>
+			value={mediaKindInput}
-				    <TagLink
+			onChange={e => setMediaKindInput (
-					tag={c3}
+			    e.target.value as MaterialIndexMediaKind)}
-					withWiki={false}
+			className={inputClass (invalid)}>
-					withCount={false}
+		      {Object.entries (MEDIA_FILTER_LABELS).map (([value, label]) => (
-					to={`/materials?tag=${ encodeURIComponent (c3.name) }`}/>
+			  <option key={value} value={value}>
-				  </SubsectionTitle>
+			    {label}
-				  {(!(c3.material) && c3.category !== 'meme') && (
+			  </option>))}
-				      <div className="-mt-2">
+		    </select>)}
-					<PrefetchLink
+	      </FormField>
-					    to={`/materials/new?tag=${
-						encodeURIComponent (c3.name) }`}>
-					  追加
-					</PrefetchLink>
-				      </div>)}
 
-				  <MaterialCard tag={c3}/>
+	      <FormField label="抑止状態">
-				</Fragment>))}
+		{({ invalid }) => (
-			  </div>
+		    <select
-			</Fragment>))}
+			value={suppressionInput}
-		  </div>
+			onChange={e => setSuppressionInput (
-		</>)
+			    e.target.value as MaterialIndexSuppression)}
-	    : (
+			className={inputClass (invalid)}>
-		<>
+		      <option value="active">有効のみ</option>
-		  <p>左のリストから照会したいタグを選択してください。</p>
+		      <option value="suppressed">抑止済みのみ</option>
-		  <p>もしくは……</p>
+		      <option value="all">すべて</option>
-		  <ul>
+		    </select>)}
-		    <li><PrefetchLink to="/materials/new">素材を新規追加する</PrefetchLink></li>
+	      </FormField>
-		    {/* <li><a href="#">すべての素材をダウンロードする</a></li> */}
+
-		  </ul>
+	      <FormField label="作成日時">
-		</>))}
+		{() => (
+		    <div className="flex flex-wrap items-center gap-2">
+		      <DateTimeField value={createdFrom ?? undefined} onChange={setCreatedFrom}/>
+		      <span>〜</span>
+		      <DateTimeField value={createdTo ?? undefined} onChange={setCreatedTo}/>
+		    </div>)}
+	      </FormField>
+
+	      <FormField label="更新日時">
+		{() => (
+		    <div className="flex flex-wrap items-center gap-2">
+		      <DateTimeField value={updatedFrom ?? undefined} onChange={setUpdatedFrom}/>
+		      <span>〜</span>
+		      <DateTimeField value={updatedTo ?? undefined} onChange={setUpdatedTo}/>
+		    </div>)}
+	      </FormField>
+	    </div>
+
+	    <div className="mt-4 flex flex-wrap gap-3">
+	      <button
+		  type="submit"
+		  className="rounded bg-sky-600 px-4 py-2 text-white hover:bg-sky-700
+			     dark:bg-sky-500 dark:text-stone-950 dark:hover:bg-sky-400">
+		検索
+	      </button>
+	    </div>
+	  </form>
+
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <div className="flex flex-wrap gap-2">
+	      <button
+		  type="button"
+		  onClick={() => updateQuery ({ view: 'card' })}
+		  className={`rounded-full border px-4 py-2 text-sm ${
+		      view === 'card'
+		      ? [
+			  'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+			  'dark:bg-sky-950 dark:text-sky-100'].join (' ')
+		      : [
+			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
+			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+		カード
+	      </button>
+	      <button
+		  type="button"
+		  onClick={() => updateQuery ({ view: 'list' })}
+		  className={`rounded-full border px-4 py-2 text-sm ${
+		      view === 'list'
+		      ? [
+			  'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+			  'dark:bg-sky-950 dark:text-sky-100'].join (' ')
+		      : [
+			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
+			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+		一覧
+	      </button>
+	    </div>
+
+	    <div className="flex flex-wrap items-center gap-2 text-sm">
+	      <select
+		  value={sort}
+		  onChange={e => updateQuery ({ sort: e.target.value, page: '1' })}
+		  className={inputClass (false, 'w-auto')}>
+		{Object.entries (SORT_LABELS).map (([value, label]) => (
+		    <option key={value} value={value}>
+		      {label}
+		    </option>))}
+	      </select>
+	      <select
+		  value={direction}
+		  onChange={e => updateQuery ({ direction: e.target.value, page: '1' })}
+		  className={inputClass (false, 'w-auto')}>
+		<option value="desc">降順</option>
+		<option value="asc">昇順</option>
+	      </select>
+	    </div>
+	  </div>
+
+	  {isLoading && <p>Loading...</p>}
+	  {isError && (
+	      <p className="text-red-600 dark:text-red-300">素材一覧の取得に失敗しました．</p>)}
+	  {(!isLoading && !isError && materials.length === 0) && (
+	      <p>素材はありません．</p>)}
+	  {materials.length > 0 && (
+	      view === 'card'
+	      ? (
+		  <div className="grid grid-cols-[repeat(auto-fill,minmax(196px,1fr))]
+				  justify-items-center gap-4">
+		    {materials.map (material => (
+			<MaterialCard key={material.id} material={material}/>))}
+		  </div>)
+	      : (
+		  <div className="space-y-3">
+		    {materials.map (material => (
+			<MaterialListItem key={material.id} material={material}/>))}
+		  </div>))}
+	  <Pagination page={page} totalPages={totalPages}/>
+	</div>
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -1,3 +1,4 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
@@ -11,16 +12,18 @@ import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import { apiPost } from '@/lib/api'
+import { createMaterial } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC } from 'react'
 
-type MaterialFormField = 'tag' | 'file' | 'url'
+type MaterialFormField = 'tag' | 'file' | 'url' | 'exportPaths'
 
 
 const MaterialNewPage: FC = () => {
+  const qc = useQueryClient ()
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const tagQuery = query.get ('tag') ?? ''
@@ -29,39 +32,38 @@ const MaterialNewPage: FC = () => {
 
   const [file, setFile] = useState<File | null> (null)
   const [filePreview, setFilePreview] = useState ('')
-  const [sending, setSending] = useState (false)
   const [tag, setTag] = useState (tagQuery)
   const [url, setURL] = useState ('')
+  const [exportPath, setExportPath] = useState ('')
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<MaterialFormField> ()
 
-  const handleSubmit = async () => {
+  const createMutation = useMutation ({
+      mutationFn: async () => {
+	const formData = new FormData
+	if (tag)
+	  formData.append ('tag', tag)
+	if (file)
+	  formData.append ('file', file)
+	if (url)
+	  formData.append ('url', url)
+	formData.append ('export_paths[legacy_drive]', exportPath)
+
+	return await createMaterial (formData)
+      },
+      onSuccess: async () => {
+	await qc.invalidateQueries ({ queryKey: materialsKeys.root })
+	toast ({ title: '送信成功!' })
+	navigate (`/materials?tag=${ encodeURIComponent (tag) }`)
+      },
+      onError: error => {
+	applyValidationError (error)
+	toast ({ title: '送信失敗……', description: '入力を見直してください．' })
+      }})
+
+  const handleSubmit = () => {
     clearValidationErrors ()
-
+    createMutation.mutate ()
-    const formData = new FormData
-    if (tag)
-      formData.append ('tag', tag)
-    if (file)
-      formData.append ('file', file)
-    if (url)
-      formData.append ('url', url)
-
-    try
-    {
-      setSending (true)
-      await apiPost ('/materials', formData)
-      toast ({ title: '送信成功!' })
-      navigate (`/materials?tag=${ encodeURIComponent (tag) }`)
-    }
-    catch (e)
-    {
-      applyValidationError (e)
-      toast ({ title: '送信失敗……', description: '入力を見直してください．' })
-    }
-    finally
-    {
-      setSending (false)
-    }
   }
 
   return (
@@ -133,11 +135,25 @@ const MaterialNewPage: FC = () => {
 		    className={inputClass (invalid)}/>)}
 	  </FormField>
 
+	  <FormField
+	      label="ZIP 出力パス"
+	      messages={fieldErrors.exportPaths}>
+	    {({ describedBy, invalid }) => (
+		<input
+		    type="text"
+		    value={exportPath}
+		    onChange={e => setExportPath (e.target.value)}
+		    placeholder="伊地知ニジカ/表情/泣き.png"
+		    aria-describedby={describedBy}
+		    aria-invalid={invalid}
+		    className={inputClass (invalid)}/>)}
+	  </FormField>
+
 	  {/* 送信 */}
 	  <Button
 	      onClick={handleSubmit}
 	      className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
-	      disabled={sending}>
+	      disabled={createMutation.isPending}>
 	    追加
 	  </Button>
 	</Form>

frontend/src/pages/posts/PostDetailPage.tsx

@@ -62,8 +62,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 	toast ({ title: '失敗……', description: '通信に失敗しました……' })
       },
       onSuccess: () => {
-	qc.invalidateQueries ({ queryKey: postsKeys.root })
+	qc.invalidateQueries ({ queryKey: postsKeys.root })} })
-      } })
 
   useEffect (() => {
     if (!(errorFlg))
@@ -114,8 +113,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 		      <PostList posts={[{ ...post, childPosts: [{ } as Post] },
 					...post.childPosts!.map (p => ({
 					    ...p, parentPosts: [{ } as Post] }))]}/>
-		    </div>
+		    </div>)}
-		)}
 		{(post.parentPosts ?? []).map (pp => {
 		  const siblings = post.siblingPosts?.[String (pp.id) as `${ number }`]
 		  if (!(siblings))

frontend/src/pages/tags/NicoTagListPage.tsx

@@ -1,6 +1,6 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { Check, LoaderCircle, Pencil, X } from 'lucide-react'
-import { useEffect, useMemo, useState } from 'react'
+import { Fragment, useEffect, useMemo, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
 
@@ -87,8 +87,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
   const defaultDirection = {
       name:       'asc',
       created_at: 'desc',
-      updated_at: 'desc',
+      updated_at: 'desc'} as const
-  } as const
 
   const beginEdit = async (tag: NicoTag) => {
     const editingTag = nicoTags.find (tag => tag.id === editingId)
@@ -99,15 +98,13 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 	&& !(await dialogue.confirm ({
 	  title:       '編集中の内容を破棄しますか?',
 	  confirmText: '破棄',
-	  variant:     'danger',
+	  variant:     'danger'})))
-	})))
       return
 
     setEditingId (tag.id)
     setRawTags (rawTags => ({
 	...rawTags,
-	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
+	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')}))
-    }))
     setErrorsByTagId (errors => ({ ...errors, [tag.id]: [] }))
   }
 
@@ -115,8 +112,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
     setEditingId (null)
     setRawTags (rawTags => ({
 	...rawTags,
-	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
+	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')}))
-    }))
     setErrorsByTagId (errors => ({ ...errors, [tag.id]: [] }))
   }
 
@@ -141,8 +137,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 	  ...errors,
 	  [id]: validationError?.fieldErrors.tags
 	      ?? validationError?.baseErrors
-	      ?? ['更新できませんでした．'],
+	      ?? ['更新できませんでした．']}))
-      }))
       toast ({ title: '更新失敗', description: '入力内容を確認してください．' })
     }
     finally
@@ -166,8 +161,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 
     setRawTags (Object.fromEntries (data.tags.map (tag => [
       tag.id,
-      tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
+      tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')])))
-    ])))
   }, [data])
 
   useEffect (() => {
@@ -282,7 +276,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 			{nicoTags.map (tag => {
 			  const isEditing = editingId === tag.id
 
-			  return [
+			  return (
+			      <Fragment key={tag.id}>
 			    <tr
 				key={tag.id}
 				className={cn (
@@ -321,8 +316,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 					  編集
 					</button>)}
 				  </td>)}
-			    </tr>,
+			    </tr>
-			    isEditing && (
+			    {isEditing && (
 				<tr key={`${ tag.id }-edit`}
 				    className="border-b border-rose-200 bg-rose-50 dark:border-rose-900
 					       dark:bg-rose-950/30">
@@ -340,8 +335,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 					  placeholder="タグ名を空白または改行で区切って入力"
 					  onChange={e => setRawTags (rawTags => ({
 					      ...rawTags,
-					      [tag.id]: e.target.value,
+					      [tag.id]: e.target.value}))}/>
-					  }))}/>
 				      <FieldError messages={errorsByTagId[tag.id]}/>
 				      <div className="flex justify-end gap-2">
 					<button
@@ -368,8 +362,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 				      </div>
 				    </div>
 				  </td>
-				</tr>),
+				</tr>)}
-			  ]
+			      </Fragment>)
 			})}
 		      </tbody>
 		    </table>

frontend/src/pages/theatres/TheatreDetailPage.tsx

@@ -69,8 +69,7 @@ const userName = (user: Pick<User, 'id' | 'name'> | null | undefined): string =>
 
 const commentBox = (
     comment: TheatreComment,
-    programme: TheatreProgramme | null = null,
+    programme: TheatreProgramme | null = null): ReactNode[] =>
-): ReactNode[] =>
     [(
 	<div key={`${ comment.no }-content`} className="w-full">
 	  {comment.deleted
@@ -120,8 +119,7 @@ const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
 
 
 const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
-    { tags, compact, flow = 'vertical' },
+    { tags, compact, flow = 'vertical' }) => {
-) => {
   const grouped = tagsByCategory (tags)
 
   if (flow === 'horizontal')

frontend/src/stores/sharedTransitionStore.ts

@@ -15,5 +15,4 @@ export const useSharedTransitionStore = create<SharedTransitionState> (set => ({
 	set (state => {
 	  const next = { ...state.byLocationKey }
 	  delete next[locationKey]
-	  return { byLocationKey: next }
+	  return { byLocationKey: next }}) }))
-	}) }))

frontend/src/test/factories.ts

@@ -71,16 +71,26 @@ export const buildWikiPage = (overrides: Partial<WikiPage> = {}): WikiPage => ({
 })
 
 export const buildMaterial = (overrides: Partial<Material> = {}): Material => ({
-  id:            1,
+  id:                    1,
-  tag:           buildTag (),
+  versionNo:             1,
-  file:          null,
+  tag:                   buildTag (),
-  url:           null,
+  file:                  null,
-  wikiPageBody:  null,
+  url:                   null,
-  contentType:   null,
+  wikiPageBody:          null,
-  createdAt:     '2026-01-02T03:04:05.000Z',
+  thumbnail:             null,
-  createdByUser: { id: 1, name: 'creator' },
+  thumbnailFallbackText: 'テストタグ',
-  updatedAt:     '2026-01-03T03:04:05.000Z',
+  thumbnailFallbackKind: 'tag_name',
-  updatedByUser: { id: 2, name: 'updater' },
+  mediaKind:             'url_only',
+  contentType:           null,
+  fileByteSize:          null,
+  fileSuppressedAt:      null,
+  fileSuppressionReason: null,
+  exportPaths:           {},
+  exportItems:           [],
+  createdAt:             '2026-01-02T03:04:05.000Z',
+  createdByUser:         { id: 1, name: 'creator' },
+  updatedAt:             '2026-01-03T03:04:05.000Z',
+  updatedByUser:         { id: 2, name: 'updater' },
   ...overrides,
 })
 

frontend/src/types.ts

@@ -65,17 +65,90 @@ export type FetchNicoTagsOrder = `${ FetchNicoTagsOrderField }:${ 'asc' | 'desc'
 
 export type FetchNicoTagsOrderField = 'name' | 'created_at' | 'updated_at'
 
+export type MaterialFilter = 'present' | 'missing' | 'any'
+
+export type MaterialIndexDirection = 'asc' | 'desc'
+
+export type MaterialIndexMediaKind =
+    | 'all'
+    | 'image'
+    | 'video'
+    | 'audio'
+    | 'file_other'
+    | 'url_only'
+
+export type MaterialIndexSort =
+    | 'created_at'
+    | 'updated_at'
+    | 'tag_name'
+    | 'media_kind'
+    | 'file_byte_size'
+    | 'version_no'
+    | 'id'
+
+export type MaterialIndexSuppression = 'active' | 'suppressed' | 'all'
+
+export type MaterialIndexTagState = 'all' | 'tagged' | 'untagged'
+
+export type MaterialIndexView = 'card' | 'list'
+
+export type FetchMaterialsParams = {
+    q:            string
+    tagState:     MaterialIndexTagState
+    mediaKind:    MaterialIndexMediaKind
+    suppression:  MaterialIndexSuppression
+    createdFrom:  string
+    createdTo:    string
+    updatedFrom:  string
+    updatedTo:    string
+    sort:         MaterialIndexSort
+    direction:    MaterialIndexDirection
+    view:         MaterialIndexView
+    page:         number
+    limit:        number }
+
 export type Material = {
-    id:             number
+    id:                     number
-    tag:            Tag
+    versionNo:              number
-    file:           string | null
+    tag:                    Tag | null
-    url:            string | null
+    file:                   string | null
-    wikiPageBody?:  string | null
+    url:                    string | null
-    contentType:    string | null
+    wikiPageBody?:          string | null
-    createdAt:      string
+    thumbnail:              string | null
-    createdByUser:  { id: number; name: string }
+    thumbnailFallbackText:  string | null
-    updatedAt:      string
+    thumbnailFallbackKind:  'tag_name' | 'created_at'
-    updatedByUser:  { id: number; name: string } }
+    mediaKind:              'image' | 'video' | 'audio' | 'file_other' | 'url_only' | 'suppressed'
+    contentType:            string | null
+    fileByteSize:           number | null
+    fileSuppressedAt:       string | null
+    fileSuppressionReason:  string | null
+    exportPaths:            Record<string, string>
+    exportItems:            MaterialExportItem[]
+    createdAt:              string
+    createdByUser:          { id: number; name: string }
+    updatedAt:              string
+    updatedByUser:          { id: number; name: string } }
+
+export type MaterialSidebarTag = {
+    id:          number
+    name:        string
+    category:    Category
+    deprecated:  boolean
+    hasChildren: boolean
+    hasMaterial: boolean
+    children:    MaterialSidebarTag[] }
+
+export type MaterialTagTree = Omit<Tag, 'children'> & {
+    hasChildren: boolean
+    hasMaterial: boolean
+    children:    MaterialTagTree[]
+    material?:   Material | null }
+
+export type MaterialExportItem = {
+    id:          number
+    profile:     string
+    exportPath:  string
+    enabled:     boolean }
 
 export type Menu = MenuItem[]