#306

AGENTS.md

@@ -271,12 +271,7 @@ const value =
 - 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.
-- In TypeScript and TSX function declarations, including `const` arrow
-  function declarations, when the parameter list spans multiple lines, always
-  put the closing parenthesis at the beginning of its own line before the return
-  type or `=>`.
-- In TypeScript and TSX, never place a closing parenthesis at the beginning of
-  a line except for a multi-line function declaration parameter list.
+- 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

backend/app/controllers/material_versions_controller.rb

@@ -35,11 +35,6 @@ class MaterialVersionsController < ApplicationController
         tag_name: row.tag_name,
         tag_category: row.tag_category,
         url: row.url,
-        source_kind: row.source_kind,
-        source_uri: row.source_uri,
-        source_path: row.source_path,
-        source_file_id: row.source_file_id,
-        normalized_source_key: row.normalized_source_key,
         file_blob_id: row.file_blob_id,
         file_filename: row.file_filename,
         file_content_type: row.file_content_type,

backend/app/controllers/materials_controller.rb

@@ -1,6 +1,3 @@
-require 'set'
-
-
 class MaterialsController < ApplicationController
   rescue_from MaterialZipExporter::EmptyExportError, with: :render_zip_empty
   rescue_from MaterialZipExporter::DuplicatePathError, with: :render_zip_duplicate_path
@@ -16,14 +13,12 @@ class MaterialsController < ApplicationController
     offset = (page - 1) * limit
 
     filters = material_index_filters
-    tag_graph = material_index_tag_graph(filters)
     q = Material.includes(:material_export_items,
                           thumbnail_attachment: :blob,
                           file_attachment: :blob,
                           tag: :tag_name)
     q = q.where(tag_id: nil) if filters[:tag_state] == 'untagged'
     q = q.where.not(tag_id: nil) if filters[:tag_state] == 'tagged'
-    q = apply_material_tag_filter(q, filters, tag_graph)
     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]
@@ -42,16 +37,8 @@ class MaterialsController < ApplicationController
         .offset(offset)
         .to_a
 
-    response = { materials: MaterialRepr.list_many(materials, host: request.base_url),
-                 count: }
-    if filters[:tag_id]
-      response[:tag_scope] = material_index_tag_scope(filters, tag_graph)
-    end
-    if filters[:group_by] == 'parent_tag'
-      response[:groups] = material_index_groups(materials, tag_graph)
-    end
-
-    render json: response
+    render json: { materials: MaterialRepr.list_many(materials, host: request.base_url),
+                   count: }
   end
 
   def show
@@ -211,18 +198,9 @@ class MaterialsController < ApplicationController
     direction = params[:direction].to_s.downcase
     direction = 'desc' unless ['asc', 'desc'].include?(direction)
 
-    group_by = params[:group_by].to_s.presence
-    group_by = 'none' unless ['none', 'parent_tag'].include?(group_by)
-
-    tag_id = params[:tag_id].to_i
-    tag_id = nil if tag_id <= 0
-
     { q: params[:q].to_s.strip.presence,
       tag_state:,
       media_kind:,
-      tag_id:,
-      include_descendants: bool?(:include_descendants),
-      group_by:,
       created_from: parse_time_param(:created_from),
       created_to: parse_time_param(:created_to),
       updated_from: parse_time_param(:updated_from),
@@ -292,147 +270,6 @@ class MaterialsController < ApplicationController
     end
   end
 
-  def apply_material_tag_filter q, filters, tag_graph
-    return q unless filters[:tag_id]
-
-    tag_ids =
-        if tag_graph
-          tag_graph[:scope_tag_ids]
-        else
-          [filters[:tag_id]]
-        end
-
-    q.where(tag_id: tag_ids)
-  end
-
-  def material_index_tag_graph filters
-    return nil unless filters[:tag_id]
-
-    children_by_parent_id = Hash.new { |h, k| h[k] = [] }
-    TagImplication.pluck(:parent_tag_id, :tag_id).each do |parent_id, child_id|
-      children_by_parent_id[parent_id] << child_id
-    end
-
-    scope_tag_ids =
-        if filters[:include_descendants]
-          collect_material_descendant_ids(filters[:tag_id], children_by_parent_id)
-        else
-          Set.new([filters[:tag_id]])
-        end
-    tags_by_id =
-        Tag
-        .joins(:tag_name)
-        .where(id: scope_tag_ids)
-        .pluck('tags.id', 'tag_names.name', 'tags.category', 'tags.deprecated_at')
-        .each_with_object({ }) do |(id, name, category, deprecated_at), hash|
-          hash[id] = { id:, name:, category:, deprecated: deprecated_at.present? }
-        end
-
-    selected_tag = tags_by_id[filters[:tag_id]]
-    return nil unless selected_tag
-
-    group_tag_id_by_tag_id = { }
-    children_by_parent_id[filters[:tag_id]].each do |child_tag_id|
-      assign_material_group_branch(child_tag_id,
-                                   children_by_parent_id:,
-                                   tags_by_id:,
-                                   group_tag_id_by_tag_id:,
-                                   current_group_tag_id: nil,
-                                   seen: Set.new([filters[:tag_id]]))
-    end
-
-    { selected_tag_id: filters[:tag_id],
-      selected_tag:,
-      scope_tag_ids: scope_tag_ids.to_a,
-      tags_by_id:,
-      group_tag_id_by_tag_id: }
-  end
-
-  def collect_material_descendant_ids selected_tag_id, children_by_parent_id
-    ids = Set.new([selected_tag_id])
-    stack = [selected_tag_id]
-
-    until stack.empty?
-      tag_id = stack.pop
-      children_by_parent_id[tag_id].each do |child_tag_id|
-        next if ids.include?(child_tag_id)
-
-        ids << child_tag_id
-        stack << child_tag_id
-      end
-    end
-
-    ids
-  end
-
-  def assign_material_group_branch tag_id, children_by_parent_id:, tags_by_id:,
-                                   group_tag_id_by_tag_id:, current_group_tag_id:, seen:
-    return if seen.include?(tag_id)
-
-    tag = tags_by_id[tag_id]
-    return unless tag
-
-    seen = seen.dup << tag_id
-    next_group_tag_id = current_group_tag_id
-    next_group_tag_id = tag_id if next_group_tag_id.nil? && !tag[:deprecated]
-    group_tag_id_by_tag_id[tag_id] = next_group_tag_id if next_group_tag_id
-
-    children_by_parent_id[tag_id].each do |child_tag_id|
-      assign_material_group_branch(child_tag_id,
-                                   children_by_parent_id:,
-                                   tags_by_id:,
-                                   group_tag_id_by_tag_id:,
-                                   current_group_tag_id: next_group_tag_id,
-                                   seen:)
-    end
-  end
-
-  def material_index_groups materials, tag_graph
-    return [] unless tag_graph
-
-    groups_by_key = { }
-
-    materials.each do |material|
-      next unless material.tag_id
-
-      group_tag_id =
-          if material.tag_id == tag_graph[:selected_tag_id]
-            tag_graph[:selected_tag_id]
-          else
-            tag_graph[:group_tag_id_by_tag_id][material.tag_id] || tag_graph[:selected_tag_id]
-          end
-
-      group_tag = tag_graph[:tags_by_id][group_tag_id]
-      next unless group_tag
-
-      key = "tag:#{ group_tag_id }"
-      group =
-          groups_by_key[key] ||= { key:,
-                                   tag: group_tag_repr(group_tag),
-                                   material_ids: [],
-                                   count: 0 }
-      group[:material_ids] << material.id
-      group[:count] += 1
-    end
-
-    groups_by_key.values.sort_by { |group| group[:tag][:name] }
-  end
-
-  def material_index_tag_scope filters, tag_graph
-    return nil unless tag_graph
-
-    {
-      tag: group_tag_repr(tag_graph[:selected_tag]),
-      include_descendants: filters[:include_descendants]
-    }
-  end
-
-  def group_tag_repr group_tag
-    { id: group_tag[:id],
-      name: group_tag[:name],
-      category: group_tag[:category] }
-  end
-
   def material_index_order_sql filters
     direction = filters[:direction] == 'asc' ? 'ASC' : 'DESC'
     sort_sql =
@@ -523,7 +360,10 @@ class MaterialsController < ApplicationController
         content_type: file.content_type,
     )
 
-    MaterialFileSha256.assign_metadata_sha256!(blob, file_sha256)
+    if file_sha256.present?
+      blob.metadata['sha256'] = file_sha256
+      blob.save! if blob.changed?
+    end
 
     blob
   ensure

backend/app/controllers/post_versions_controller.rb

@@ -25,7 +25,6 @@ class PostVersionsController < ApplicationController
         SQL
         .select('post_versions.*', 'prev.title AS prev_title', 'prev.url AS prev_url',
                 'prev.thumbnail_base AS prev_thumbnail_base', 'prev.tags AS prev_tags',
-                'prev.video_ms AS prev_video_ms',
                 'prev.original_created_from AS prev_original_created_from',
                 'prev.original_created_before AS prev_original_created_before')
     q = q.where('post_versions.post_id = ?', post_id) if post_id
@@ -75,10 +74,6 @@ class PostVersionsController < ApplicationController
           current: row.thumbnail_base,
           prev: row.attributes['prev_thumbnail_base']
         },
-        video_ms: {
-          current: row.video_ms,
-          prev: row.attributes['prev_video_ms']
-        },
         tags: build_version_tags(cur_tags, prev_tags),
         original_created_from: {
           current: row.original_created_from&.iso8601,

backend/app/controllers/posts_controller.rb

@@ -1,10 +1,6 @@
 class PostsController < ApplicationController
   Event = Struct.new(:post, :tag, :user, :change_type, :timestamp, keyword_init: true)
 
-  class VideoMsParseError < ArgumentError
-    ;
-  end
-
   def index
     url = params[:url].presence
     title = params[:title].presence
@@ -49,9 +45,7 @@ class PostsController < ApplicationController
         .joins("LEFT JOIN (#{ pt_max_sql }) pt_max ON pt_max.post_id = posts.id")
         .reselect('posts.*', Arel.sql("#{ updated_at_all_sql } AS updated_at_all"))
         .preload(:uploaded_user, :parents, :children,
-                 active_post_tags: [:sections,
-                                    { tag: [:deerjikists, :materials,
-                                            { tag_name: :wiki_page }] }])
+                 tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -103,9 +97,7 @@ class PostsController < ApplicationController
 
   def random
     post = filtered_posts.preload(:uploaded_user, :parents, :children,
-                                  active_post_tags: [:sections,
-                                                     { tag: [:deerjikists, :materials,
-                                                             { tag_name: :wiki_page }] }])
+                                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
                          .with_attached_thumbnail
                          .order('RAND()')
                          .first
@@ -118,9 +110,7 @@ class PostsController < ApplicationController
     post =
         Post
         .includes(:uploaded_user, :parents, :children,
-                  active_post_tags: [:sections,
-                                     { tag: [:deerjikists, :materials,
-                                             { tag_name: :wiki_page }] }])
+                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
         .find_by(id: params[:id])
     return head :not_found unless post
@@ -135,7 +125,7 @@ class PostsController < ApplicationController
                                  child_posts:,
                                  sibling_posts:,
                                  related:)
-                         .merge(tags: build_tag_tree_for(post))
+                         .merge(tags: build_tag_tree_for(post.tags))
   end
 
   def create
@@ -150,27 +140,24 @@ class PostsController < ApplicationController
     original_created_from = params[:original_created_from]
     original_created_before = params[:original_created_before]
     parent_post_ids = parse_parent_post_ids
-    resized_thumbnail = thumbnail.present? ? Post.resized_thumbnail_attachment(thumbnail) : nil
 
     post = Post.new(title:, url:, thumbnail_base: nil, uploaded_user: current_user,
                     original_created_from:, original_created_before:)
-    post.thumbnail.attach(resized_thumbnail) if resized_thumbnail
+    post.thumbnail.attach(thumbnail) if thumbnail.present?
 
     ApplicationRecord.transaction do
       post.save!
 
-      Tag.normalise_tags!(tag_names, deny_deprecated: true, with_sections: true) =>
-          { tags:, sections: }
+      tags = Tag.normalise_tags!(tag_names, deny_deprecated: true)
       TagVersioning.record_tag_snapshots!(tags, created_by_user: current_user)
 
       tags = Tag.expand_parent_tags(tags).reject(&:deprecated?)
-      post.video_ms = normalise_video_ms(tags)
-      validate_video_sections!(post.video_ms, sections)
-      post.save!
-      sync_post_tags!(post, tags, sections)
+      sync_post_tags!(post, tags)
 
       sync_parent_posts!(post, parent_post_ids)
 
+      post.resized_thumbnail!
+
       PostVersionRecorder.record!(post:, event_type: :create, created_by_user: current_user)
     end
 
@@ -180,12 +167,6 @@ class PostsController < ApplicationController
     render_validation_error fields: { tags: 'ニコニコ・タグは直接指定できません．' }
   rescue Tag::DeprecatedTagNormalisationError
     render_unprocessable_entity '廃止済みタグは付与できません．', field: :tags
-  rescue Tag::SectionLiteralParseError
-    render_validation_error fields: { tags: ['タグ区間の記法が不正です．'] }
-  rescue VideoMsParseError
-    render_validation_error fields: { video_ms: ['動画時間の記法が不正です．'] }
-  rescue MiniMagick::Error
-    render_validation_error fields: { thumbnail: ['サムネイル画像の変換に失敗しました．'] }
   rescue ArgumentError => e
     render_validation_error fields: { parent_post_ids: [e.message] }
   rescue ActiveRecord::RecordInvalid => e
@@ -242,8 +223,6 @@ class PostsController < ApplicationController
                                                  original_created_from:,
                                                  original_created_before:,
                                                  tag_names:,
-                                                 video_ms_param: params[:video_ms],
-                                                 duration_param: params[:duration],
                                                  parent_post_ids:)
 
       snapshot_to_apply =
@@ -274,16 +253,12 @@ class PostsController < ApplicationController
 
     post.reload
     json = PostRepr.base(post, current_user)
-    json['tags'] = build_tag_tree_for(post)
+    json['tags'] = build_tag_tree_for(post.tags)
     render json:, status: :ok
   rescue Tag::NicoTagNormalisationError
     render_validation_error fields: { tags: ['ニコニコ・タグは直接指定できません．'] }
   rescue Tag::DeprecatedTagNormalisationError
     render_unprocessable_entity '廃止済みタグは付与できません．', field: :tags
-  rescue Tag::SectionLiteralParseError
-    render_validation_error fields: { tags: ['タグ区間の記法が不正です．'] }
-  rescue VideoMsParseError
-    render_validation_error fields: { video_ms: ['動画時間の記法が不正です．'] }
   rescue ArgumentError => e
     render_validation_error fields: { parent_post_ids: [e.message] }
   rescue ActiveRecord::RecordInvalid => e
@@ -382,7 +357,7 @@ class PostsController < ApplicationController
   def tagged_post_ids_for(name) =
       Post.joins(tags: :tag_name).where(tag_names: { name: }).select(:id)
 
-  def sync_post_tags! post, desired_tags, sections
+  def sync_post_tags! post, desired_tags
     desired_tags.each do |t|
       t.save! if t.new_record?
     end
@@ -401,21 +376,13 @@ class PostsController < ApplicationController
       end
     end
 
-    PostTagSection.where(post_id: post.id).destroy_all
-    sections.each do |tag_id, ranges|
-      ranges.each do |begin_ms, end_ms|
-        PostTagSection.create!(post_id: post.id, tag_id:, begin_ms:, end_ms:)
-      end
-    end
-
     PostTag.where(post_id: post.id, tag_id: to_remove.to_a).kept.find_each do |pt|
       pt.discard_by!(current_user)
     end
   end
 
-  def build_tag_tree_for post
-    post_tags = post.active_post_tags.reject { |post_tag| post_tag.tag.deprecated? }
-    tags = post_tags.map(&:tag)
+  def build_tag_tree_for tags
+    tags = tags.reject(&:deprecated?).to_a
     tag_ids = tags.map(&:id)
 
     implications = TagImplication.where(parent_tag_id: tag_ids, tag_id: tag_ids)
@@ -430,9 +397,6 @@ class PostsController < ApplicationController
     root_ids = tag_ids - child_ids
 
     tags_by_id = tags.index_by(&:id)
-    sections_by_tag_id = post_tags.to_h { |post_tag|
-      [post_tag.tag_id, post_tag.sections.as_json(only: [:begin_ms, :end_ms])]
-    }
 
     memo = { }
 
@@ -440,10 +404,8 @@ class PostsController < ApplicationController
       tag = tags_by_id[tag_id]
       return nil unless tag
 
-      sections = sections_by_tag_id.fetch(tag_id, [])
-
       if path.include?(tag_id)
-        return TagRepr.inline(tag).merge(children: [], sections:)
+        return TagRepr.inline(tag).merge(children: [])
       end
 
       if memo.key?(tag_id)
@@ -455,7 +417,7 @@ class PostsController < ApplicationController
 
       children = child_ids.filter_map { |cid| build_node.(cid, new_path) }
 
-      memo[tag_id] = TagRepr.inline(tag).merge(children:, sections:)
+      memo[tag_id] = TagRepr.inline(tag).merge(children:)
     end
 
     root_ids.filter_map { |id| build_node.call(id, []) }
@@ -524,7 +486,6 @@ class PostsController < ApplicationController
 
   def post_snapshot_from_version version
     { title: version.title,
-      video_ms: version.respond_to?(:video_ms) ? version.video_ms : nil,
       original_created_from: snapshot_time(version.original_created_from),
       original_created_before: snapshot_time(version.original_created_before),
       tag_names: editable_tag_names_from_version(version),
@@ -537,7 +498,6 @@ class PostsController < ApplicationController
 
   def post_snapshot_from_record post
     { title: post.title,
-      video_ms: post.video_ms,
       original_created_from: snapshot_time(post.original_created_from),
       original_created_before: snapshot_time(post.original_created_before),
       tag_names: editable_tag_names_from_post(post),
@@ -545,41 +505,16 @@ class PostsController < ApplicationController
   end
 
   def editable_tag_names_from_post post
-    post
-        .post_tags
-        .kept
-        .joins(tag: :tag_name)
-        .merge(Tag.not_nico)
-        .merge(Tag.where(deprecated_at: nil))
-        .includes(:sections, tag: :tag_name)
-        .order('tag_names.name')
-        .map do |post_tag|
-      name = post_tag.tag.tag_name.name
-      sections = post_tag.sections.sort_by(&:begin_ms)
-
-      next name if sections.empty?
-
-      "#{ name }#{ sections.map { Post.section_literal(_1) }.join }"
-    end
+    post.tags.not_nico.where(deprecated_at: nil)
+        .joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
   end
 
   def post_incoming_snapshot title:, original_created_from:, original_created_before:,
-                             tag_names:, video_ms_param:, duration_param:, parent_post_ids:
-    Tag.normalise_tags!(tag_names, with_tagme: false, deny_deprecated: true,
-                                        with_sections: true) =>
-        { tags:, sections: }
-
-    tags = Tag.expand_parent_tags(tags).reject(&:deprecated?)
-    video_ms = normalise_video_ms(tags, video_ms_param:, duration_param:)
-    validate_video_sections!(video_ms, sections)
-
+                             tag_names:, parent_post_ids:
     { title:,
-      video_ms:,
       original_created_from: snapshot_time(original_created_from),
       original_created_before: snapshot_time(original_created_before),
-      tag_names: tags.uniq(&:id).map { |tag|
-        "#{ tag.name }#{ sections[tag.id].to_a.map { section_literal(_1) }.join }"
-      }.sort,
+      tag_names: incoming_tag_names_for_snapshot(tag_names),
       parent_post_ids: parent_post_ids.sort }
   end
 
@@ -602,8 +537,11 @@ class PostsController < ApplicationController
     value.to_s
   end
 
-  def section_literal section
-    "[#{ Post.ms_to_time(section[0]) }-#{ section[1] ? Post.ms_to_time(section[1]) : '' }]"
+  def incoming_tag_names_for_snapshot raw_tag_names
+    tags = Tag.normalise_tags!(raw_tag_names, with_tagme: false,
+                                              deny_deprecated: true)
+
+    Tag.expand_parent_tags(tags).reject(&:deprecated?).map(&:name).uniq.sort
   end
 
   def post_conflict_json post:, base_version_no:, base_snapshot:,
@@ -624,8 +562,6 @@ class PostsController < ApplicationController
   def post_snapshot_changes base_snapshot, current_snapshot, incoming_snapshot
     [scalar_snapshot_change(:title, 'タイトル',
                             base_snapshot, current_snapshot, incoming_snapshot),
-     scalar_snapshot_change(:video_ms, '動画時間',
-                            base_snapshot, current_snapshot, incoming_snapshot),
      scalar_snapshot_change(:original_created_from, 'オリジナルの作成日時（以降）',
                             base_snapshot, current_snapshot, incoming_snapshot),
      scalar_snapshot_change(:original_created_before, 'オリジナルの作成日時（より前）',
@@ -689,14 +625,11 @@ class PostsController < ApplicationController
     PostVersionRecorder.ensure_snapshot!(post, created_by_user: current_user)
 
     post.update!(title: snapshot[:title],
-                 video_ms: snapshot[:video_ms],
                  original_created_from: snapshot[:original_created_from],
                  original_created_before: snapshot[:original_created_before])
 
-    Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false,
-                                               deny_deprecated: true,
-                                               with_sections: true) =>
-        { tags: editable_tags, sections: }
+    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false,
+                                                               deny_deprecated: true)
     TagVersioning.record_tag_snapshots!(editable_tags, created_by_user: current_user)
 
     readonly_tags = post.tags.nico.to_a
@@ -704,17 +637,14 @@ class PostsController < ApplicationController
     tags = readonly_tags + editable_tags
     tags = Tag.expand_parent_tags(tags).reject(&:deprecated?)
 
-    post.video_ms = tags.any? { _1.id == Tag.video.id } ? snapshot[:video_ms] : nil
-    validate_video_sections!(post.video_ms, sections)
-    post.save!
-    sync_post_tags!(post, tags, sections)
+    sync_post_tags!(post, tags)
     sync_parent_posts!(post, snapshot[:parent_post_ids])
 
     PostVersionRecorder.record!(post:, event_type: :update, created_by_user: current_user)
   end
 
   def merge_post_snapshots base_snapshot, current_snapshot, incoming_snapshot
-    [:title, :video_ms, :original_created_from, :original_created_before].map {
+    [:title, :original_created_from, :original_created_before].map {
       [_1, merge_scalar_snapshot_value(base_snapshot[_1],
                                        current_snapshot[_1],
                                        incoming_snapshot[_1])]
@@ -758,44 +688,4 @@ class PostsController < ApplicationController
       render_validation_error record
     end
   end
-
-  def normalise_video_ms tags, video_ms_param: params[:video_ms], duration_param: params[:duration]
-    return nil unless tags.any? { _1.id == Tag.video.id }
-
-    if video_ms_param.present?
-      video_ms = Integer(video_ms_param, exception: false)
-      raise VideoMsParseError unless video_ms&.positive?
-
-      return video_ms
-    end
-
-    return nil if duration_param.blank?
-
-    video_ms = Tag.time_to_ms!(duration_param.to_s, tag_name: '動画時間')
-    raise VideoMsParseError unless video_ms.positive?
-
-    video_ms
-  rescue Tag::SectionLiteralParseError
-    raise VideoMsParseError
-  end
-
-  def validate_video_sections! video_ms, sections
-    return unless video_ms
-
-    sections.each_value do |ranges|
-      ranges.each do |begin_ms, end_ms|
-        if begin_ms >= video_ms
-          post = Post.new
-          post.errors.add :video_ms, 'タグ区間の開始が動画時間以上です．'
-          raise ActiveRecord::RecordInvalid, post
-        end
-
-        if end_ms && end_ms > video_ms
-          post = Post.new
-          post.errors.add :video_ms, 'タグ区間の終端が動画時間を超えてゐます．'
-          raise ActiveRecord::RecordInvalid, post
-        end
-      end
-    end
-  end
 end

backend/app/controllers/tags_controller.rb

@@ -245,7 +245,10 @@ class TagsController < ApplicationController
     return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
     return render_unprocessable_entity '廃止状態は必須です．', field: :deprecated unless params.key?(:deprecated)
 
-    return unless validate_tag_rename(tag, name)
+    if (name != tag.name &&
+        tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico]))
+      return render_unprocessable_entity 'システム・タグの名称は変更できません．', field: :name
+    end
 
     alias_names = params[:aliases].to_s.split.uniq
     parent_names = params[:parent_tags].to_s.split.uniq
@@ -271,7 +274,7 @@ class TagsController < ApplicationController
       else
         tag.update!(category:, deprecated_at: deprecated ? Time.current : nil)
       end
-      rename_tag_name!(tag, name) if name_changed
+      tag.tag_name.update!(name:)
 
       alias_names << old_name if name_changed
       alias_names.delete(name)
@@ -307,8 +310,6 @@ class TagsController < ApplicationController
       return render_unprocessable_entity 'ニコタグは廃止できません．', field: :deprecated
     end
 
-    return unless validate_tag_rename(tag, name)
-
     if tag.nico? || (category.present? && category == 'nico')
       return render_unprocessable_entity 'ニコタグは変更できません．', field: :category
     end
@@ -320,7 +321,7 @@ class TagsController < ApplicationController
       name_changed = name.present? && name != old_name
       wiki_page = tag.tag_name.wiki_page if name_changed
 
-      rename_tag_name!(tag, name) if name_changed
+      tag.tag_name.update!(name:) if name.present?
       tag.update!(category:) if category.present?
       if deprecated_given && tag.deprecated? != deprecated
         tag.update!(deprecated_at: deprecated ? Time.current : nil)
@@ -378,20 +379,12 @@ class TagsController < ApplicationController
   end
 
   def visible_root_tag_ids graph
-    root_ids = Set.new
-
-    graph[:tags_by_id].each do |tag_id, attrs|
+    graph[:tags_by_id].filter_map do |tag_id, _attrs|
       next unless visible_root_tag?(tag_id, graph)
       next unless visible_subtree?(tag_id, graph)
 
-      if attrs[:deprecated]
-        collect_visible_child_tag_ids(tag_id, graph, root_ids, Set.new)
-      else
-        root_ids << tag_id
-      end
+      tag_id
     end
-
-    root_ids.to_a
   end
 
   def visible_root_tag? tag_id, graph
@@ -534,67 +527,6 @@ class TagsController < ApplicationController
         created_by_user:)
   end
 
-  def validate_tag_rename tag, name
-    return true if name.blank? || name == tag.name
-
-    if tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
-      render_unprocessable_entity 'システム・タグの名称は変更できません．', field: :name
-      return false
-    end
-
-    target_tag_name = TagName.with_discarded.find_by(name:)
-    return true if target_tag_name.nil?
-    return true if target_tag_name.canonical_id?
-
-    render_unprocessable_entity 'その名前は既に使はれてゐます．', field: :name
-    false
-  end
-
-  def rename_tag_name! tag, name
-    return if name == tag.name
-
-    current_tag_name = tag.tag_name
-    target_tag_name = TagName.with_discarded.find_by(name:)
-
-    if target_tag_name.nil?
-      current_tag_name.update!(name:)
-      return
-    end
-
-    promote_tag_alias!(
-        tag,
-        current_tag_name:,
-        promoted_tag_name: target_tag_name)
-  end
-
-  def promote_tag_alias! tag, current_tag_name:, promoted_tag_name:
-    old_owner_tag = promoted_tag_name.canonical&.tag
-
-    if old_owner_tag && old_owner_tag != tag
-      TagVersioning.ensure_snapshot!(old_owner_tag, created_by_user: current_user)
-    end
-
-    promoted_tag_name.undiscard! if promoted_tag_name.discarded?
-    promoted_tag_name.update!(canonical: nil)
-
-    TagName.with_discarded
-           .where(canonical_id: current_tag_name.id)
-           .where.not(id: promoted_tag_name.id)
-           .find_each do |alias_tag_name|
-      alias_tag_name.update!(canonical: promoted_tag_name)
-    end
-
-    current_tag_name.wiki_page&.update!(tag_name: promoted_tag_name)
-    tag.update!(tag_name: promoted_tag_name)
-    current_tag_name.association(:wiki_page).reset
-    current_tag_name.association(:tag).reset
-    current_tag_name.reload.update!(canonical: promoted_tag_name)
-
-    return unless old_owner_tag && old_owner_tag != tag
-
-    record_tag_version!(old_owner_tag.reload, event_type: :update, created_by_user: current_user)
-  end
-
   def update_aliases! tag, alias_names
     alias_names = alias_names.uniq
 

backend/app/models/material.rb

@@ -1,9 +1,6 @@
 class Material < ApplicationRecord
   include MyDiscard
 
-  SOURCE_KINDS = ['uri', 'google_drive_path', 'google_drive_file',
-                  'legacy_drive_path'].freeze
-
   default_scope -> { kept }
 
   belongs_to :parent, class_name: 'Material', optional: true
@@ -23,7 +20,7 @@ class Material < ApplicationRecord
 
   validates :tag_id, uniqueness: true, allow_nil: true
   validates :source_kind,
-            inclusion: { in: SOURCE_KINDS },
+            inclusion: { in: MaterialSyncSuppression::SOURCE_KINDS },
             allow_blank: true
 
   validate :file_must_be_attached

backend/app/models/material_sync_source.rb

@@ -1,13 +1,11 @@
 class MaterialSyncSource < ApplicationRecord
-  SOURCE_KINDS = ['uri', 'google_drive_path', 'google_drive_file', 'legacy_drive_path'].freeze
-
   belongs_to :created_by_user, class_name: 'User', optional: true
   belongs_to :updated_by_user, class_name: 'User', optional: true
 
   validates :name, presence: true
   validates :source_kind,
             presence: true,
-            inclusion: { in: SOURCE_KINDS }
+            inclusion: { in: MaterialSyncSuppression::SOURCE_KINDS }
   validates :profile, presence: true, inclusion: { in: MaterialExportItem::VALID_PROFILES }
   validate :source_value_must_be_present
 
@@ -35,7 +33,7 @@ class MaterialSyncSource < ApplicationRecord
     when 'google_drive_file'
       source_file_id.present? || source_uri.present?
     when 'google_drive_path'
-      source_file_id.present? || source_uri.present?
+      source_file_id.present? || source_uri.present? || source_path.present?
     when 'legacy_drive_path'
       source_path.present?
     else

backend/app/models/post.rb

@@ -1,19 +1,5 @@
 class Post < ApplicationRecord
   require 'mini_magick'
-  require 'stringio'
-
-  def self.resized_thumbnail_attachment(upload)
-    upload.rewind
-    image = MiniMagick::Image.read(upload.read)
-    image.resize '180x180'
-    image.format 'jpg'
-
-    { io: StringIO.new(image.to_blob),
-      filename: 'resized_thumbnail.jpg',
-      content_type: 'image/jpeg' }
-  ensure
-    upload.rewind
-  end
 
   belongs_to :uploaded_user, class_name: 'User', optional: true
 
@@ -60,7 +46,6 @@ class Post < ApplicationRecord
   before_validation :normalise_url
 
   validates :url, presence: true, uniqueness: true
-  validates :video_ms, numericality: { only_integer: true, greater_than: 0 }, allow_nil: true
 
   validate :validate_original_created_range
   validate :url_must_be_http_url
@@ -84,42 +69,7 @@ class Post < ApplicationRecord
     super(options).merge(thumbnail: nil)
   end
 
-  def snapshot_tag_names
-    post_tags
-        .kept
-        .joins(tag: :tag_name)
-        .includes(:sections, tag: :tag_name)
-        .order('tag_names.name')
-        .map do |post_tag|
-      name = post_tag.tag.tag_name.name
-      sections = post_tag.sections.sort_by(&:begin_ms)
-
-      next name if sections.empty?
-
-      "#{ name }#{ sections.map { Post.section_literal(_1) }.join }"
-    end
-  end
-
-  def self.section_literal section
-    "[#{ Post.ms_to_time(section.begin_ms) }-#{ section.end_ms ? Post.ms_to_time(section.end_ms) : '' }]"
-  end
-
-  def self.ms_to_time ms
-    total_s = ms / 1_000
-    s = total_s % 60
-    min = (total_s / 60) % 60
-    h = total_s / 3_600
-    remainder_ms = ms % 1_000
-
-    base =
-        if h.positive?
-          '%d:%02d:%02d' % [h, min, s]
-        else
-          '%d:%02d' % [min, s]
-        end
-
-    remainder_ms.positive? ? "#{ base }.#{ remainder_ms.to_s.rjust(3, '0') }" : base
-  end
+  def snapshot_tag_names = tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
 
   def snapshot_parent_post_ids = parents.order(:id).pluck(:id)
 
@@ -137,7 +87,12 @@ class Post < ApplicationRecord
   def resized_thumbnail!
     return unless thumbnail.attached?
 
-    thumbnail.attach(self.class.resized_thumbnail_attachment(StringIO.new(thumbnail.download)))
+    image = MiniMagick::Image.read(thumbnail.download)
+    image.resize '180x180'
+    thumbnail.purge
+    thumbnail.attach(io:            File.open(image.path),
+                     filename:      'resized_thumbnail.jpg',
+                     content_type:  'image/jpeg')
   end
 
   private

backend/app/models/post_tag.rb

@@ -10,12 +10,6 @@ class PostTag < ApplicationRecord
   belongs_to :created_user, class_name: 'User', optional: true
   belongs_to :deleted_user, class_name: 'User', optional: true
 
-  has_many :sections, -> { order(:begin_ms) }, class_name: 'PostTagSection',
-                                               foreign_key: [:post_id, :tag_id],
-                                               primary_key: [:post_id, :tag_id],
-                                               dependent: :delete_all,
-                                               inverse_of: :post_tag
-
   validates :post_id, presence: true
   validates :tag_id, presence: true
   validates :post_id, uniqueness: {

backend/app/models/post_tag_section.rb

@@ -1,20 +0,0 @@
-class PostTagSection < ApplicationRecord
-  self.primary_key = :post_id, :tag_id, :begin_ms
-
-  belongs_to :post
-  belongs_to :tag
-
-  belongs_to :post_tag, -> { kept }, foreign_key: [:post_id, :tag_id],
-                                     primary_key: [:post_id, :tag_id],
-                                     inverse_of: :sections,
-                                     optional: true
-
-  validates :post_id, presence: true
-  validates :tag_id, presence: true
-
-  validates :begin_ms, presence: true,
-                       numericality: { only_integer: true, greater_than_or_equal_to: 0 }
-
-  validates :end_ms, numericality: { only_integer: true, greater_than: :begin_ms },
-                     allow_nil: true
-end

backend/app/models/post_version.rb

@@ -5,7 +5,6 @@ class PostVersion < ApplicationRecord
   belongs_to :parent, class_name: 'Post', optional: true
 
   validates :url, presence: true
-  validates :video_ms, numericality: { only_integer: true, greater_than: 0 }, allow_nil: true
 
   validate :validate_original_created_range
 

backend/app/models/tag.rb

@@ -17,16 +17,6 @@ class Tag < ApplicationRecord
     end
   end
 
-  class SectionLiteralParseError < ArgumentError
-    attr_reader :tag_name, :literal
-
-    def initialize tag_name, literal
-      @tag_name = tag_name
-      @literal = literal
-      super("invalid section literal for tag #{ tag_name }: #{ literal }")
-    end
-  end
-
   has_many :post_tags, inverse_of: :tag
   has_many :active_post_tags, -> { kept }, class_name: 'PostTag', inverse_of: :tag
   has_many :post_tags_with_discarded, -> { with_discarded }, class_name: 'PostTag'
@@ -115,60 +105,26 @@ class Tag < ApplicationRecord
   def self.normalise_tags! tag_names, with_tagme: true,
                                       with_no_deerjikist: true,
                                       deny_nico: true,
-                                      deny_deprecated: false,
-                                      with_sections: false
+                                      deny_deprecated: false
     if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end
 
-    sections = { }
     tags = tag_names.map do |name|
-      raw_name = name
       pf, cat = CATEGORY_PREFIXES.find { |p, _| name.downcase.start_with?(p) } || ['', nil]
-
-      name = name.sub(/\A#{ pf }/i, '')
-
-      sections_by_tag = []
-      while (match = name.match(/\A(\S*?)\[([^\[\]\s]*)-([^\[\]\s]*)\](\S*)\z/))
-        name = "#{ match[1] }#{ match[4] }"
-        next if match[2].empty? && match[3].empty?
-
-        sections_by_tag << normalise_section_range!(
-            begin_raw: match[2],
-            end_raw: match[3],
-            tag_name: name)
-      end
-
-      if name.include?('[') || name.include?(']')
-        raise SectionLiteralParseError.new(raw_name, raw_name)
-      end
-
-      name = TagName.canonicalise(name).first
-
+      name = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
       find_or_create_by_tag_name!(name, category: (cat || :general)).tap do |tag|
         if deny_deprecated && tag.deprecated?
           raise DeprecatedTagNormalisationError, [tag.name]
         end
 
         tag.update!(category: cat) if cat && tag.category != cat
-        next if sections_by_tag.empty?
-
-        sections[tag.id] ||= []
-        sections[tag.id].concat(sections_by_tag)
-        sections[tag.id] = merge_section_ranges(sections[tag.id])
-        sections.delete(tag.id) if sections[tag.id] == [[0, nil]]
       end
     end
 
     tags << Tag.tagme if with_tagme && tags.size < 10 && tags.none?(Tag.tagme)
     tags << Tag.no_deerjikist if with_no_deerjikist && tags.all? { |t| !(t.deerjikist?) }
-    tags.uniq!(&:id)
-
-    if with_sections
-      { tags:, sections: }
-    else
-      tags
-    end
+    tags.uniq(&:id)
   end
 
   def self.expand_parent_tags tags
@@ -194,45 +150,6 @@ class Tag < ApplicationRecord
     (result + tags).uniq { |t| t.id }
   end
 
-  def self.normalise_section_range! begin_raw:, end_raw:, tag_name:
-    begin_ms = begin_raw.empty? ? 0 : time_to_ms!(begin_raw, tag_name:)
-    end_ms = end_raw.empty? ? nil : time_to_ms!(end_raw, tag_name:)
-
-    if end_ms
-      begin_ms, end_ms = end_ms, begin_ms if begin_ms > end_ms
-      end_ms = begin_ms + 1 if begin_ms == end_ms
-    end
-
-    [begin_ms, end_ms]
-  end
-
-  def self.merge_section_ranges ranges
-    sorted_ranges = ranges.sort_by { |begin_ms, end_ms| [begin_ms, end_ms || Float::INFINITY] }
-    merged = []
-
-    sorted_ranges.each do |begin_ms, end_ms|
-      if merged.empty?
-        merged << [begin_ms, end_ms]
-        next
-      end
-
-      last_begin_ms, last_end_ms = merged[-1]
-      if last_end_ms.nil? || begin_ms <= last_end_ms
-        merged[-1] = [last_begin_ms, merge_section_end(last_end_ms, end_ms)]
-      else
-        merged << [begin_ms, end_ms]
-      end
-    end
-
-    merged
-  end
-
-  def self.merge_section_end left_end_ms, right_end_ms
-    return nil if left_end_ms.nil? || right_end_ms.nil?
-
-    [left_end_ms, right_end_ms].max
-  end
-
   def self.find_or_create_by_tag_name! name, category:
     tn = TagName.find_undiscard_or_create_by!(name: name.to_s.strip)
     tn = tn.canonical if tn.canonical_id?
@@ -329,32 +246,6 @@ class Tag < ApplicationRecord
     end
   end
 
-  def self.time_to_ms! str, tag_name:
-    match =
-        case str
-        when /\A(?<seconds>\d+)(?:\.(?<ms>\d{1,3}))?\z/
-          { hours: nil, minutes: nil, seconds: Regexp.last_match[:seconds],
-            ms: Regexp.last_match[:ms] }
-        when /\A(?<minutes>\d+):(?<seconds>[0-5]?\d)(?:\.(?<ms>\d{1,3}))?\z/
-          { hours: nil, minutes: Regexp.last_match[:minutes],
-            seconds: Regexp.last_match[:seconds],
-            ms: Regexp.last_match[:ms] }
-        when /\A(?<hours>\d+):(?<minutes>[0-5]?\d):(?<seconds>[0-5]?\d)(?:\.(?<ms>\d{1,3}))?\z/
-          { hours: Regexp.last_match[:hours],
-            minutes: Regexp.last_match[:minutes],
-            seconds: Regexp.last_match[:seconds],
-            ms: Regexp.last_match[:ms] }
-        end
-
-    raise SectionLiteralParseError.new(tag_name, str) unless match
-
-    total_s = match[:seconds].to_i
-    total_s += match[:minutes].to_i * 60 if match[:minutes]
-    total_s += match[:hours].to_i * 3_600 if match[:hours]
-
-    total_s * 1_000 + match[:ms].to_s.ljust(3, '0')[0, 3].to_i
-  end
-
   def nico_tags_cannot_be_deprecated
     if nico? && deprecated_at.present?
       errors.add :deprecated_at, 'ニコタグは廃止できません．'

backend/app/models/tag_implication.rb

@@ -6,7 +6,6 @@ class TagImplication < ApplicationRecord
   validates :parent_tag_id, presence: true
 
   validate :parent_tag_mustnt_be_itself
-  validate :parent_tag_mustnt_create_cycle
 
   private
 
@@ -15,27 +14,4 @@ class TagImplication < ApplicationRecord
       errors.add :parent_tag_id, '親タグは子タグと同一であってはなりません．'
     end
   end
-
-  def parent_tag_mustnt_create_cycle
-    return if tag_id.blank? || parent_tag_id.blank?
-    return if errors[:parent_tag_id].present?
-
-    seen = { }
-    stack = [parent_tag_id]
-
-    until stack.empty?
-      current_id = stack.pop
-      next if seen[current_id]
-
-      seen[current_id] = true
-
-      if current_id == tag_id
-        errors.add :parent_tag_id, '親タグに子孫タグを指定すると循環します．'
-        errors.add :base, 'タグの親子関係が循環します．'
-        return
-      end
-
-      stack.concat(TagImplication.where(tag_id: current_id).pluck(:parent_tag_id))
-    end
-  end
 end

backend/app/representations/post_repr.rb

@@ -8,7 +8,6 @@ module PostRepr
       :url,
       :title,
       :thumbnail_base,
-      :video_ms,
       :original_created_from,
       :original_created_before,
       :created_at,
@@ -19,7 +18,7 @@ module PostRepr
 
   def base post, current_user = nil
     json = common(post)
-    json['tags'] = tag_json(post)
+    json['tags'] = tag_json(post.tags)
     json['uploaded_user'] = post.uploaded_user && UserRepr.base(post.uploaded_user)
     json['viewed'] = current_user ? current_user.viewed?(post) : false
     json
@@ -53,16 +52,8 @@ module PostRepr
                .merge('thumbnail' => thumbnail_url(post))
   end
 
-  def tag_json post
-    post
-        .active_post_tags
-        .reject { _1.tag.deprecated? }
-        .sort_by { _1.tag.name }
-        .map { |post_tag|
-      TagRepr.inline(post_tag.tag).merge(
-          'children' => [],
-          'sections' => post_tag.sections.as_json(only: [:begin_ms, :end_ms]))
-    }
+  def tag_json tags
+    tags.reject(&:deprecated?).map { |tag| TagRepr.inline(tag) }
   end
 
   def thumbnail_url post

backend/app/services/google_drive/api_client.rb

@@ -11,7 +11,6 @@ module GoogleDrive
     DRIVE_ENDPOINT = 'https://www.googleapis.com/drive/v3'
     TOKEN_ENDPOINT = 'https://oauth2.googleapis.com/token'
     FOLDER_MIME_TYPE = 'application/vnd.google-apps.folder'
-    NATIVE_FILE_MIME_TYPE_PREFIX = 'application/vnd.google-apps.'
     DRIVE_SCOPE = 'https://www.googleapis.com/auth/drive.readonly'
 
     def initialize service_account_email: ENV['GOOGLE_DRIVE_SERVICE_ACCOUNT_EMAIL'],
@@ -26,34 +25,24 @@ module GoogleDrive
 
     def list_material_files_under_folder folder_id
       files = []
-      each_material_file_under_folder(folder_id) { |entry| files << entry }
-      files
-    end
-
-    def each_material_file_under_folder folder_id
-      return enum_for(__method__, folder_id) unless block_given?
-
       walk_folder(folder_id, nil) do |entry, relative_path|
         next if entry['mimeType'] == FOLDER_MIME_TYPE
-        next if native_file?(entry['mimeType'])
 
-        yield build_file_entry(entry, relative_path)
+        files << build_file_entry(entry, relative_path)
       end
+      files
     end
 
     def fetch_material_file file_id
       metadata = get_file(file_id)
-      return nil if native_file?(metadata['mimeType'])
-
       build_file_entry(metadata, metadata['name'])
     end
 
     def download_to_tempfile file_id, filename:
       tempfile = Tempfile.new(['material-sync', File.extname(filename.to_s)])
-      tempfile.binmode
       request_binary("/files/#{ file_id }",
                      { alt: 'media', supportsAllDrives: true }) do |chunk|
-        tempfile.write(chunk.b)
+        tempfile.write(chunk)
       end
       tempfile.rewind
       tempfile
@@ -96,7 +85,6 @@ module GoogleDrive
         name: entry['name'],
         mime_type: entry['mimeType'],
         relative_path: MaterialSyncExportPath.normalize_path(relative_path),
-        sha256_checksum: entry['sha256Checksum'],
         web_view_link: entry['webViewLink'],
         web_content_link: entry['webContentLink'] }
     end
@@ -109,8 +97,7 @@ module GoogleDrive
         response =
             request_json('/files', {
                 q: "'#{ folder_id }' in parents and trashed = false",
-                fields: 'nextPageToken,files(id,name,mimeType,sha256Checksum,' \
-                        'webViewLink,webContentLink)',
+                fields: 'nextPageToken,files(id,name,mimeType,webViewLink,webContentLink)',
                 orderBy: 'folder,name',
                 pageSize: 1000,
                 supportsAllDrives: true,
@@ -126,7 +113,7 @@ module GoogleDrive
 
     def get_file file_id
       request_json("/files/#{ file_id }",
-                   fields: 'id,name,mimeType,sha256Checksum,webViewLink,webContentLink',
+                   fields: 'id,name,mimeType,webViewLink,webContentLink',
                    supportsAllDrives: true)
     end
 
@@ -140,14 +127,13 @@ module GoogleDrive
     end
 
     def request_binary path, params = {}
-      request(:get, path, params:) do |response|
-        unless response.is_a?(Net::HTTPSuccess)
-          raise "Google Drive download error: #{ response.code } #{ response.body }"
-        end
+      response = request(:get, path, params:)
+      unless response.is_a?(Net::HTTPSuccess)
+        raise "Google Drive download error: #{ response.code } #{ response.body }"
+      end
 
-        response.read_body do |chunk|
-          yield chunk.b
-        end
+      response.read_body do |chunk|
+        yield chunk
       end
     end
 
@@ -170,13 +156,7 @@ module GoogleDrive
                       use_ssl: true,
                       open_timeout: 10,
                       read_timeout: 60) do |http|
-        if block_given?
-          http.request(request) do |response|
-            return yield response
-          end
-        else
-          http.request(request)
-        end
+        http.request(request)
       end
     end
 
@@ -225,9 +205,5 @@ module GoogleDrive
 
       OpenSSL::PKey::RSA.new(raw)
     end
-
-    def native_file? mime_type
-      mime_type.to_s.start_with?(NATIVE_FILE_MIME_TYPE_PREFIX)
-    end
   end
 end

backend/app/services/material_file_sha256.rb

@@ -1,39 +1,16 @@
 require 'digest'
-require 'json'
 
 class MaterialFileSha256
-  def self.blob_metadata blob
-    metadata = blob.metadata
-    return metadata if metadata.is_a?(Hash)
-    return { } if metadata.blank?
-
-    JSON.parse(metadata)
-  rescue JSON::ParserError
-    { }
-  end
-
-  def self.metadata_sha256 blob
-    blob_metadata(blob)['sha256'].presence
-  end
-
-  def self.assign_metadata_sha256! blob, sha256
-    return if sha256.blank?
-
-    metadata = blob_metadata(blob)
-    metadata['sha256'] = sha256
-    blob.metadata = metadata
-    blob.save! if blob.changed?
-  end
-
   def self.from_blob blob, allow_download: false
-    sha256 = metadata_sha256(blob)
+    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
-        assign_metadata_sha256!(blob, sha256)
+        blob.metadata['sha256'] = sha256
+        blob.save! if blob.changed?
         sha256
       end
     rescue ActiveStorage::FileNotFoundError, ArgumentError => error

backend/app/services/material_sync_importer.rb

@@ -28,13 +28,6 @@ class MaterialSyncImporter
         Material
         .unscoped
         .find_or_initialize_by(normalized_source_key: key)
-    if unchanged?(material, source)
-      return Result.new(material:,
-                        action: :unchanged,
-                        suppressed: false,
-                        suppression: nil)
-    end
-
     event_type =
         if material.new_record?
           :create
@@ -44,19 +37,13 @@ class MaterialSyncImporter
           :update
         end
     uploaded_blob = uploaded_blob!
-    if @import_block
-      return Result.new(material: nil,
-                        action: :suppressed,
-                        suppressed: true,
-                        suppression: @import_block)
-    end
 
     Material.transaction do
       if material.persisted?
         MaterialVersionRecorder.ensure_snapshot!(material,
                                                  created_by_user: @attributes[:updated_by_user])
       end
-      material.assign_attributes(material_attributes_for(material).merge(source))
+      material.assign_attributes(material_attributes.merge(source))
       material.discarded_at = nil if material.respond_to?(:discarded_at=)
       material.file.attach(uploaded_blob) if uploaded_blob
       material.save!
@@ -94,28 +81,10 @@ class MaterialSyncImporter
                                                  source_file_id: source[:source_file_id])
   end
 
-  def material_attributes_for material
-    attrs =
-        @attributes
-        .except(:source_kind, :source_uri, :source_path, :source_file_id,
-                :file_blob, :file_tempfile, :file_downloader,
-                :filename, :content_type,
-                :file_sha256, :export_path, :profile, :tag, :url)
-
-    if material.new_record?
-      attrs[:tag] = @attributes[:tag] if @attributes.key?(:tag)
-      attrs[:url] = @attributes[:url] if @attributes.key?(:url)
-      return attrs
-    end
-
-    if @attributes.key?(:tag) && @attributes[:tag].present?
-      attrs[:tag] = @attributes[:tag]
-    end
-    if @attributes.key?(:url) && @attributes[:url].present?
-      attrs[:url] = @attributes[:url]
-    end
-
-    attrs
+  def material_attributes
+    @attributes.except(:source_kind, :source_uri, :source_path, :source_file_id,
+                       :file_blob, :file_tempfile, :filename, :content_type,
+                       :file_sha256, :export_path, :profile)
   end
 
   def suppression_for source
@@ -131,44 +100,33 @@ class MaterialSyncImporter
   def uploaded_blob!
     return @attributes[:file_blob] if @attributes[:file_blob]
 
-    tempfile = upload_tempfile
+    tempfile = @attributes[:file_tempfile]
     return nil unless tempfile
 
     tempfile.rewind
-    file_sha256 = @attributes[:file_sha256] || Digest::SHA256.file(tempfile.path).hexdigest
-    @attributes[:file_sha256] = file_sha256
-
-    @import_block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
-    if @import_block
-      tempfile.rewind
-      return nil
-    end
-
     blob = ActiveStorage::Blob.create_and_upload!(
         io: tempfile,
         filename: @attributes[:filename],
         content_type: @attributes[:content_type])
-    MaterialFileSha256.assign_metadata_sha256!(blob, file_sha256)
+    file_sha256 = @attributes[:file_sha256] || Digest::SHA256.file(tempfile.path).hexdigest
+    blob.metadata['sha256'] = file_sha256 if file_sha256.present?
+    blob.save! if blob.changed?
     tempfile.rewind
     blob
   end
 
-  def upload_tempfile
-    return @upload_tempfile if defined?(@upload_tempfile)
-
-    @upload_tempfile = @attributes[:file_tempfile]
-    if @upload_tempfile.blank? && @attributes[:file_downloader]
-      @upload_tempfile = @attributes[:file_downloader].call
-    end
-    @upload_tempfile
-  end
-
   def upsert_export_item! material
-    export_path = resolved_export_path(material)
+    export_path = @attributes[:export_path].to_s.strip
     return if export_path.blank?
 
-    item = material.material_export_items.find_or_initialize_by(profile: effective_profile)
-    item.export_path = export_path
+    profile = @attributes[:profile].presence || 'legacy_drive'
+    path = export_path
+    if export_path_taken_by_other?(material, profile, path)
+      path = MaterialSyncExportPath.uniquify(path, @attributes[:source_file_id])
+    end
+
+    item = material.material_export_items.find_or_initialize_by(profile:)
+    item.export_path = path
     item.enabled = true
     item.created_by_user ||= @attributes[:created_by_user]
     item.save!
@@ -182,78 +140,11 @@ class MaterialSyncImporter
   end
 
   def close_tempfile!
-    tempfile = upload_tempfile
+    tempfile = @attributes[:file_tempfile]
     return unless tempfile
 
     tempfile.close! unless tempfile.closed?
   rescue StandardError
     nil
   end
-
-  def unchanged? material, source
-    return false if material.new_record? || material.discarded?
-    return false unless same_source_attributes?(material, source)
-    return false unless same_export_path?(material)
-    return false unless same_material_attributes?(material)
-
-    same_file_snapshot?(material)
-  end
-
-  def same_source_attributes? material, source
-    material.source_kind == source[:source_kind] \
-      && material.source_uri == source[:source_uri] \
-      && material.source_path == source[:source_path] \
-      && material.source_file_id == source[:source_file_id]
-  end
-
-  def same_export_path? material
-    expected = resolved_export_path(material)
-    current = material.material_export_items.find { |item| item.profile == effective_profile }
-
-    return current.blank? if expected.blank?
-
-    current&.enabled && current.export_path == expected
-  end
-
-  def same_material_attributes? material
-    same_tag_attribute?(material) && same_url_attribute?(material)
-  end
-
-  def same_file_snapshot? material
-    expected_sha256 = @attributes[:file_sha256].to_s.presence
-
-    if expected_sha256.present?
-      return false unless material.file.attached?
-
-      return MaterialFileSha256.metadata_sha256(material.file.blob) == expected_sha256
-    end
-
-    !material.file.attached?
-  end
-
-  def effective_profile
-    @attributes[:profile].presence || 'legacy_drive'
-  end
-
-  def resolved_export_path material
-    export_path = @attributes[:export_path].to_s.strip
-    return export_path if export_path.blank?
-    return export_path unless export_path_taken_by_other?(material, effective_profile, export_path)
-
-    MaterialSyncExportPath.uniquify(export_path, @attributes[:source_file_id])
-  end
-
-  def same_tag_attribute? material
-    return true unless @attributes.key?(:tag)
-    return true if @attributes[:tag].blank?
-
-    material.tag_id == @attributes[:tag].id
-  end
-
-  def same_url_attribute? material
-    return true unless @attributes.key?(:url)
-    return true if @attributes[:url].blank?
-
-    material.url == @attributes[:url]
-  end
 end

backend/app/services/material_sync_runner.rb

@@ -1,13 +1,13 @@
+require 'digest'
+
 class MaterialSyncRunner
-  Result = Struct.new(:imported, :updated, :unchanged, :suppressed, :failed,
-                      :errors, keyword_init: true)
+  Result = Struct.new(:imported, :updated, :suppressed, :failed, :errors, keyword_init: true)
 
   def self.sync_enabled!
     results = MaterialSyncSource.enabled.order(:id).map { |source| new(source).sync! }
 
     Result.new(imported: results.sum(&:imported),
                updated: results.sum(&:updated),
-               unchanged: results.sum(&:unchanged),
                suppressed: results.sum(&:suppressed),
                failed: results.sum(&:failed),
                errors: results.flat_map(&:errors))
@@ -18,17 +18,10 @@ class MaterialSyncRunner
   end
 
   def sync!
-    result = Result.new(imported: 0, updated: 0, unchanged: 0,
-                        suppressed: 0, failed: 0, errors: [])
+    result = Result.new(imported: 0, updated: 0, suppressed: 0, failed: 0, errors: [])
 
-    if @source.source_kind == 'google_drive_path'
-      sync_google_drive_path!(result)
-    else
-      candidates.each do |candidate|
-        next if candidate.blank?
-
-        sync_candidate!(candidate, result)
-      end
+    candidates.each do |candidate|
+      sync_candidate!(candidate, result)
     end
 
     @source.update!(last_synced_at: Time.current)
@@ -47,6 +40,8 @@ class MaterialSyncRunner
     case @source.source_kind
     when 'uri'
       [uri_candidate]
+    when 'google_drive_path'
+      google_drive_path_candidates
     when 'google_drive_file'
       [google_drive_file_candidate]
     when 'legacy_drive_path'
@@ -106,30 +101,15 @@ class MaterialSyncRunner
   def google_drive_path_candidates
     folder_id = google_drive_folder_id
     Enumerator.new do |entries|
-      drive_client.each_material_file_under_folder(folder_id).each do |entry|
+      drive_client.list_material_files_under_folder(folder_id).each do |entry|
         entries << build_google_drive_candidate(entry)
       end
     end
   end
 
-  def sync_google_drive_path! result
-    folder_id = google_drive_folder_id
-    scanned_count = 0
-
-    drive_client.each_material_file_under_folder(folder_id) do |entry|
-      scanned_count += 1
-      sync_candidate!(build_google_drive_candidate(entry), result)
-      log_google_drive_progress(folder_id, scanned_count, result) if progress_log_scan_count?(scanned_count)
-    end
-
-    log_google_drive_progress(folder_id, scanned_count, result, summary: true)
-  end
-
   def google_drive_file_candidate
-    entry = drive_client.fetch_material_file(google_drive_file_id)
-    return nil unless entry
-
-    build_google_drive_candidate(entry, single_file: true)
+    build_google_drive_candidate(drive_client.fetch_material_file(google_drive_file_id),
+                                 single_file: true)
   end
 
   def build_google_drive_candidate entry, single_file: false
@@ -144,6 +124,10 @@ class MaterialSyncRunner
                                      relative_path:,
                                      filename: entry[:name],
                                      source_file_id: entry[:id])
+    tempfile =
+        drive_client.download_to_tempfile(entry[:id], filename: entry[:name])
+    file_sha256 = Digest::SHA256.file(tempfile.path).hexdigest
+    tempfile.rewind
 
     { source_kind: 'google_drive_file',
       source_uri: entry[:web_view_link] || google_drive_file_url(entry[:id]),
@@ -151,10 +135,8 @@ class MaterialSyncRunner
       source_file_id: entry[:id],
       filename: entry[:name],
       content_type: entry[:mime_type],
-      file_downloader: lambda {
-        drive_client.download_to_tempfile(entry[:id], filename: entry[:name])
-      },
-      file_sha256: entry[:sha256_checksum],
+      file_tempfile: tempfile,
+      file_sha256:,
       export_path:,
       profile: @source.profile,
       tag: nil,
@@ -189,17 +171,13 @@ class MaterialSyncRunner
 
   def google_drive_folder_id
     google_drive_target_id.tap do |id|
-      if id.blank?
-        raise ArgumentError, 'google_drive_path source_file_id or source_uri is required'
-      end
+      raise ArgumentError, 'google_drive_path source_file_id or source_uri is required' if id.blank?
     end
   end
 
   def google_drive_file_id
     google_drive_target_id.tap do |id|
-      if id.blank?
-        raise ArgumentError, 'google_drive_file source_file_id or source_uri is required'
-      end
+      raise ArgumentError, 'google_drive_file source_file_id or source_uri is required' if id.blank?
     end
   end
 
@@ -223,27 +201,10 @@ class MaterialSyncRunner
   def log_result result
     Rails.logger.info(material_sync_log(imported: result.imported,
                                         updated: result.updated,
-                                        unchanged: result.unchanged,
                                         suppressed: result.suppressed,
                                         failed: result.failed))
   end
 
-  def progress_log_scan_count? scanned_count
-    scanned_count == 1 || (scanned_count % 50).zero?
-  end
-
-  def log_google_drive_progress folder_id, scanned_count, result, summary: false
-    Rails.logger.info(
-        material_sync_log(folder_id:,
-                          scanned_count:,
-                          imported: result.imported,
-                          updated: result.updated,
-                          unchanged: result.unchanged,
-                          suppressed: result.suppressed,
-                          failed: result.failed,
-                          progress: summary ? 'summary' : 'scan'))
-  end
-
   def material_sync_log fields
     { material_sync_source_id: @source.id,
       material_sync_source_name: @source.name }.merge(fields).to_json

backend/app/services/material_version_recorder.rb

@@ -33,11 +33,6 @@ class MaterialVersionRecorder < VersionRecorder
       tag: @record.tag,
       tag_name: @record.tag&.name,
       tag_category: @record.tag&.category,
-      source_kind: @record.source_kind,
-      source_uri: @record.source_uri,
-      source_path: @record.source_path,
-      source_file_id: @record.source_file_id,
-      normalized_source_key: @record.normalized_source_key,
       export_paths_json: @record.snapshot_export_paths,
       discarded_at: @record.discarded_at,
       file_blob_id: file_snapshot[:file_blob_id],
@@ -57,7 +52,7 @@ class MaterialVersionRecorder < VersionRecorder
       file_content_type: blob.content_type,
       file_byte_size: blob.byte_size,
       file_checksum: blob.checksum,
-      file_sha256: MaterialFileSha256.metadata_sha256(blob) }
+      file_sha256: blob.metadata['sha256'] }
   end
 
   def empty_file_snapshot

backend/app/services/post_version_recorder.rb

@@ -23,7 +23,6 @@ class PostVersionRecorder < VersionRecorder
     { title: @record.title,
       url: @record.url,
       thumbnail_base: @record.thumbnail_base,
-      video_ms: @record.video_ms,
       tags: @record.snapshot_tag_names.join(' '),
       parent_post_ids: @record.snapshot_parent_post_ids.join(' '),
       original_created_from: @record.original_created_from,

backend/db/migrate/20260519013100_add_video_ms_to_posts.rb

@@ -1,9 +0,0 @@
-class AddVideoMsToPosts < ActiveRecord::Migration[8.0]
-  def change
-    add_column :posts, :video_ms, :integer
-    add_index :posts, [:video_ms, :id], name: 'idx_posts_video_ms_id'
-
-    add_check_constraint :posts, 'video_ms IS NULL OR video_ms > 0',
-                         name: 'chk_posts_video_ms_positive'
-  end
-end

backend/db/migrate/20260622010000_create_post_tag_sections.rb

@@ -1,19 +0,0 @@
-class CreatePostTagSections < ActiveRecord::Migration[8.0]
-  def change
-    create_table :post_tag_sections, primary_key: [:post_id, :tag_id, :begin_ms] do |t|
-      t.references :post, null: false, foreign_key: true, index: false
-      t.references :tag, null: false, foreign_key: true, index: false
-      t.integer :begin_ms, null: false
-      t.integer :end_ms, null: true
-      t.timestamps
-
-      t.index [:post_id, :begin_ms], name: 'idx_post_tag_sections_post_id_begin_ms'
-
-      t.check_constraint 'begin_ms >= 0',
-                         name: 'chk_post_tag_sections_begin_ms_natural'
-
-      t.check_constraint 'end_ms IS NULL OR begin_ms < end_ms',
-                         name: 'chk_post_tag_sections_end_ms_after_begin_ms'
-    end
-  end
-end

backend/db/migrate/20260622020000_add_video_ms_to_post_versions.rb

@@ -1,9 +0,0 @@
-class AddVideoMsToPostVersions < ActiveRecord::Migration[8.0]
-  def change
-    add_column :post_versions, :video_ms, :integer
-    add_index :post_versions, [:video_ms, :post_id], name: 'idx_post_versions_video_ms_post_id'
-
-    add_check_constraint :post_versions, 'video_ms IS NULL OR video_ms > 0',
-                         name: 'chk_post_versions_video_ms_positive'
-  end
-end

backend/db/migrate/20260623000000_enhance_material_management.rb

@@ -2,6 +2,9 @@ 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|
@@ -15,6 +18,8 @@ class EnhanceMaterialManagement < ActiveRecord::Migration[8.0]
       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
@@ -30,7 +35,7 @@ class EnhanceMaterialManagement < ActiveRecord::Migration[8.0]
     add_index :material_versions, :file_blob_id
 
     add_check_constraint :material_versions,
-                         "event_type IN ('create', 'update', 'discard', 'restore')",
+                         "event_type IN ('create', 'update', 'discard', 'restore', 'suppress')",
                          name: 'material_versions_event_type_valid'
 
     create_table :material_export_items do |t|
@@ -82,7 +87,12 @@ class EnhanceMaterialManagement < ActiveRecord::Migration[8.0]
     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/migrate/20260626000000_add_source_snapshot_to_material_versions.rb

@@ -1,19 +0,0 @@
-class AddSourceSnapshotToMaterialVersions < ActiveRecord::Migration[8.0]
-  def change
-    unless column_exists?(:material_versions, :source_kind)
-      add_column :material_versions, :source_kind, :string
-    end
-    unless column_exists?(:material_versions, :source_uri)
-      add_column :material_versions, :source_uri, :string
-    end
-    unless column_exists?(:material_versions, :source_path)
-      add_column :material_versions, :source_path, :string
-    end
-    unless column_exists?(:material_versions, :source_file_id)
-      add_column :material_versions, :source_file_id, :string
-    end
-    unless column_exists?(:material_versions, :normalized_source_key)
-      add_column :material_versions, :normalized_source_key, :string
-    end
-  end
-end

backend/db/migrate/20260626010000_backfill_initial_material_versions.rb

@@ -1,171 +0,0 @@
-require 'json'
-
-class BackfillInitialMaterialVersions < ActiveRecord::Migration[8.0]
-  class MigrationMaterial < ActiveRecord::Base
-    self.table_name = 'materials'
-  end
-
-  class MigrationMaterialExportItem < ActiveRecord::Base
-    self.table_name = 'material_export_items'
-  end
-
-  class MigrationMaterialVersion < ActiveRecord::Base
-    self.table_name = 'material_versions'
-  end
-
-  class MigrationStorageAttachment < ActiveRecord::Base
-    self.table_name = 'active_storage_attachments'
-  end
-
-  class MigrationStorageBlob < ActiveRecord::Base
-    self.table_name = 'active_storage_blobs'
-  end
-
-  class MigrationTag < ActiveRecord::Base
-    self.table_name = 'tags'
-  end
-
-  class MigrationTagName < ActiveRecord::Base
-    self.table_name = 'tag_names'
-  end
-
-  def up
-    say_with_time 'Backfilling initial material versions' do
-      materials_without_versions.find_in_batches(batch_size: 500) do |materials|
-        material_ids = materials.map(&:id)
-        tags_by_id = load_tags(materials.map(&:tag_id).compact.uniq)
-        export_paths_by_material_id = load_export_paths(material_ids)
-        file_snapshots_by_material_id = load_file_snapshots(material_ids)
-
-        rows = materials.map do |material|
-          tag = tags_by_id[material.tag_id]
-          file_snapshot = file_snapshots_by_material_id[material.id] || empty_file_snapshot
-
-          { material_id: material.id,
-            version_no: 1,
-            event_type: 'create',
-            url: material.url,
-            parent_id: material.parent_id,
-            tag_id: material.tag_id,
-            tag_name: tag&.fetch(:name, nil),
-            tag_category: tag&.fetch(:category, nil),
-            source_kind: material.source_kind,
-            source_uri: material.source_uri,
-            source_path: material.source_path,
-            source_file_id: material.source_file_id,
-            normalized_source_key: material.normalized_source_key,
-            export_paths_json: export_paths_by_material_id[material.id] || { },
-            discarded_at: material.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],
-            created_by_user_id: material.created_by_user_id,
-            updated_by_user_id: material.updated_by_user_id,
-            created_at: material.created_at,
-            updated_at: material.created_at }
-        end
-
-        MigrationMaterialVersion.insert_all!(rows) if rows.present?
-      end
-    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
-    raise ActiveRecord::IrreversibleMigration
-  end
-
-  private
-
-  def materials_without_versions
-    MigrationMaterial.where.not(id: MigrationMaterialVersion.select(:material_id))
-  end
-
-  def load_tags tag_ids
-    return { } if tag_ids.empty?
-
-    tag_name_ids_by_tag_id = MigrationTag.where(id: tag_ids).pluck(:id, :tag_name_id).to_h
-    tag_names_by_id =
-        MigrationTagName
-        .where(id: tag_name_ids_by_tag_id.values.uniq)
-        .pluck(:id, :name)
-        .to_h
-    categories_by_tag_id = MigrationTag.where(id: tag_ids).pluck(:id, :category).to_h
-
-    tag_ids.each_with_object({ }) do |tag_id, hash|
-      hash[tag_id] = { name: tag_names_by_id[tag_name_ids_by_tag_id[tag_id]],
-                       category: categories_by_tag_id[tag_id] }
-    end
-  end
-
-  def load_export_paths material_ids
-    MigrationMaterialExportItem
-      .where(material_id: material_ids)
-      .order(:material_id, :profile)
-      .pluck(:material_id, :profile, :export_path)
-      .each_with_object({ }) do |(material_id, profile, export_path), hash|
-        hash[material_id] ||= { }
-        hash[material_id][profile] = export_path
-      end
-  end
-
-  def load_file_snapshots material_ids
-    attachments_by_material_id =
-        MigrationStorageAttachment
-        .where(record_type: 'Material', name: 'file', record_id: material_ids)
-        .pluck(:record_id, :blob_id)
-        .to_h
-
-    blobs_by_id =
-        MigrationStorageBlob
-        .where(id: attachments_by_material_id.values.uniq)
-        .index_by(&:id)
-
-    attachments_by_material_id.each_with_object({ }) do |(material_id, blob_id), hash|
-      blob = blobs_by_id[blob_id]
-      next unless blob
-
-      hash[material_id] = {
-        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(blob)['sha256']
-      }
-    end
-  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 blob_metadata blob
-    metadata = blob.metadata
-    return metadata if metadata.is_a?(Hash)
-    return { } if metadata.blank?
-
-    JSON.parse(metadata)
-  rescue JSON::ParserError
-    { }
-  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_26_010000) do
+ActiveRecord::Schema[8.0].define(version: 2026_06_25_010000) 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
@@ -72,7 +72,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.index ["correct_post_id"], name: "index_gekanator_games_on_correct_post_id"
     t.index ["guessed_post_id"], name: "index_gekanator_games_on_guessed_post_id"
     t.index ["user_id"], name: "index_gekanator_games_on_user_id"
-    t.check_constraint "`question_count` >= 0", name: "chk_gekanator_games_question_count_nonnegative"
   end
 
   create_table "gekanator_question_examples", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -214,11 +213,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.bigint "file_byte_size"
     t.string "file_checksum"
     t.string "file_sha256"
-    t.string "source_kind"
-    t.string "source_uri"
-    t.string "source_path"
-    t.string "source_file_id"
-    t.string "normalized_source_key"
     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"
@@ -275,10 +269,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.datetime "created_at", null: false
     t.bigint "created_by_user_id"
     t.index ["created_at"], name: "index_nico_tag_versions_on_created_at"
-    t.index ["created_by_user_id", "created_at"], name: "index_nico_tag_versions_on_created_by_user_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "created_at"], name: "index_nico_tag_versions_on_tag_id_and_created_at", order: { created_at: :desc }
+    t.index ["created_by_user_id", "created_at"], name: "index_nico_tag_versions_on_created_by_user_id_and_created_at"
+    t.index ["tag_id", "created_at"], name: "index_nico_tag_versions_on_tag_id_and_created_at"
     t.index ["tag_id", "version_no"], name: "index_nico_tag_versions_on_tag_id_and_version_no", unique: true
-    t.check_constraint "`version_no` > 0", name: "nico_tag_versions_version_no_positive"
   end
 
   create_table "post_implications", primary_key: ["post_id", "parent_post_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -287,30 +280,16 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["parent_post_id"], name: "index_post_implications_on_parent_post_id"
-    t.check_constraint "`post_id` <> `parent_post_id`", name: "chk_post_implications_no_self"
   end
 
   create_table "post_similarities", primary_key: ["post_id", "target_post_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.bigint "target_post_id", null: false
     t.float "cos", null: false
-    t.index ["post_id", "cos"], name: "index_post_similarities_on_post_id_and_cos", order: { cos: :desc }
+    t.index ["post_id", "cos"], name: "index_post_similarities_on_post_id_and_cos"
     t.index ["target_post_id"], name: "index_post_similarities_on_target_post_id"
   end
 
-  create_table "post_tag_sections", primary_key: ["post_id", "tag_id", "begin_ms"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "post_id", null: false
-    t.bigint "tag_id", null: false
-    t.integer "begin_ms", null: false
-    t.integer "end_ms"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["post_id", "begin_ms"], name: "idx_post_tag_sections_post_id_begin_ms"
-    t.index ["tag_id"], name: "fk_rails_8be3847903"
-    t.check_constraint "(`end_ms` is null) or (`begin_ms` < `end_ms`)", name: "chk_post_tag_sections_end_ms_after_begin_ms"
-    t.check_constraint "`begin_ms` >= 0", name: "chk_post_tag_sections_begin_ms_natural"
-  end
-
   create_table "post_tags", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.bigint "tag_id", null: false
@@ -344,14 +323,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.datetime "original_created_before"
     t.datetime "created_at", null: false
     t.bigint "created_by_user_id"
-    t.integer "video_ms"
     t.index ["created_by_user_id"], name: "index_post_versions_on_created_by_user_id"
     t.index ["post_id", "version_no"], name: "index_post_versions_on_post_id_and_version_no", unique: true
     t.index ["post_id"], name: "index_post_versions_on_post_id"
-    t.index ["video_ms", "post_id"], name: "idx_post_versions_video_ms_post_id"
-    t.check_constraint "(`video_ms` is null) or (`video_ms` > 0)", name: "chk_post_versions_video_ms_positive"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "post_versions_event_type_valid"
-    t.check_constraint "`version_no` > 0", name: "post_versions_version_no_positive"
   end
 
   create_table "posts", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -364,12 +338,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.datetime "original_created_before"
     t.datetime "updated_at", null: false
     t.integer "version_no", null: false
-    t.integer "video_ms"
     t.index ["uploaded_user_id"], name: "index_posts_on_uploaded_user_id"
     t.index ["url"], name: "index_posts_on_url", unique: true
-    t.index ["video_ms", "id"], name: "idx_posts_video_ms_id"
-    t.check_constraint "(`video_ms` is null) or (`video_ms` > 0)", name: "chk_posts_video_ms_positive"
-    t.check_constraint "`version_no` > 0", name: "chk_posts_version_no_positive"
   end
 
   create_table "settings", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -416,7 +386,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.bigint "tag_id", null: false
     t.bigint "target_tag_id", null: false
     t.float "cos", null: false
-    t.index ["tag_id", "cos"], name: "index_tag_similarities_on_tag_id_and_cos", order: { cos: :desc }
+    t.index ["tag_id", "cos"], name: "index_tag_similarities_on_tag_id_and_cos"
     t.index ["target_tag_id"], name: "index_tag_similarities_on_target_tag_id"
   end
 
@@ -426,32 +396,30 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.string "event_type", null: false
     t.string "name", null: false
     t.string "category", null: false
-    t.datetime "deprecated_at"
     t.text "aliases", null: false
     t.text "parent_tag_ids", null: false
+    t.datetime "deprecated_at"
     t.datetime "created_at", null: false
     t.bigint "created_by_user_id"
     t.index ["created_at"], name: "index_tag_versions_on_created_at"
-    t.index ["created_by_user_id", "created_at"], name: "index_tag_versions_on_created_by_user_id_and_created_at", order: { created_at: :desc }
-    t.index ["tag_id", "created_at"], name: "index_tag_versions_on_tag_id_and_created_at", order: { created_at: :desc }
+    t.index ["created_by_user_id", "created_at"], name: "index_tag_versions_on_created_by_user_id_and_created_at"
+    t.index ["tag_id", "created_at"], name: "index_tag_versions_on_tag_id_and_created_at"
     t.index ["tag_id", "version_no"], name: "index_tag_versions_on_tag_id_and_version_no", unique: true
-    t.check_constraint "`version_no` > 0", name: "tag_versions_version_no_positive"
   end
 
   create_table "tags", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "tag_name_id", null: false
     t.string "category", default: "general", null: false
+    t.datetime "deprecated_at"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.integer "post_count", default: 0, null: false
-    t.datetime "deprecated_at"
     t.datetime "discarded_at"
     t.integer "version_no", null: false
     t.index ["deprecated_at"], name: "index_tags_on_deprecated_at"
     t.index ["discarded_at"], name: "index_tags_on_discarded_at"
     t.index ["tag_name_id"], name: "index_tags_on_tag_name_id", unique: true
     t.check_constraint "(`deprecated_at` is null) or (`category` <> _utf8mb4'nico')", name: "chk_tags_deprecated_at_not_nico"
-    t.check_constraint "`version_no` > 0", name: "chk_tags_version_no_positive"
   end
 
   create_table "theatre_comments", primary_key: ["theatre_id", "no"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -576,19 +544,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.index ["banned_at"], name: "index_users_on_banned_at"
   end
 
-  create_table "wiki_assets", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "wiki_page_id", null: false
-    t.integer "no", null: false
-    t.string "alt_text"
-    t.binary "sha256", limit: 32, null: false
-    t.bigint "created_by_user_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_wiki_assets_on_created_by_user_id"
-    t.index ["wiki_page_id", "no"], name: "index_wiki_assets_on_wiki_page_id_and_no", unique: true
-    t.index ["wiki_page_id", "sha256"], name: "index_wiki_assets_on_wiki_page_id_and_sha256", unique: true
-  end
-
   create_table "wiki_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "sha256", limit: 64, null: false
     t.text "body", null: false
@@ -605,13 +560,11 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
-    t.integer "next_asset_no", default: 1, null: false
     t.integer "version_no", null: false
     t.index ["created_user_id"], name: "index_wiki_pages_on_created_user_id"
     t.index ["discarded_at"], name: "index_wiki_pages_on_discarded_at"
     t.index ["tag_name_id"], name: "index_wiki_pages_on_tag_name_id", unique: true
     t.index ["updated_user_id"], name: "index_wiki_pages_on_updated_user_id"
-    t.check_constraint "`version_no` > 0", name: "chk_wiki_pages_version_no_positive"
   end
 
   create_table "wiki_revision_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -656,8 +609,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
     t.index ["created_by_user_id"], name: "index_wiki_versions_on_created_by_user_id"
     t.index ["wiki_page_id", "version_no"], name: "index_wiki_versions_on_wiki_page_id_and_version_no", unique: true
     t.index ["wiki_page_id"], name: "index_wiki_versions_on_wiki_page_id"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "wiki_versions_event_type_valid"
-    t.check_constraint "`version_no` > 0", name: "wiki_versions_version_no_positive"
   end
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
@@ -697,8 +648,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
   add_foreign_key "post_implications", "posts", column: "parent_post_id"
   add_foreign_key "post_similarities", "posts"
   add_foreign_key "post_similarities", "posts", column: "target_post_id"
-  add_foreign_key "post_tag_sections", "posts"
-  add_foreign_key "post_tag_sections", "tags"
   add_foreign_key "post_tags", "posts"
   add_foreign_key "post_tags", "tags"
   add_foreign_key "post_tags", "users", column: "created_user_id"
@@ -738,8 +687,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_26_010000) do
   add_foreign_key "user_ips", "users"
   add_foreign_key "user_post_views", "posts"
   add_foreign_key "user_post_views", "users"
-  add_foreign_key "wiki_assets", "users", column: "created_by_user_id"
-  add_foreign_key "wiki_assets", "wiki_pages"
   add_foreign_key "wiki_pages", "tag_names"
   add_foreign_key "wiki_pages", "users", column: "created_user_id"
   add_foreign_key "wiki_pages", "users", column: "updated_user_id"

backend/db/seeds.rb

@@ -9,19 +9,19 @@
 #   end
 
 material_sync_source_uri = ENV['MATERIAL_SYNC_SOURCE_URI']
-material_sync_source_file_id = ENV['MATERIAL_SYNC_SOURCE_FILE_ID']
+material_sync_source_tag_name = ENV['MATERIAL_SYNC_SOURCE_TAG_NAME']
 
-if material_sync_source_uri.present? || material_sync_source_file_id.present?
+if material_sync_source_uri.present? && material_sync_source_tag_name.present?
   source = MaterialSyncSource.find_or_initialize_by(
       name: ENV.fetch('MATERIAL_SYNC_SOURCE_NAME', 'Legacy URI material sync'))
   source.assign_attributes(
       source_kind: ENV.fetch('MATERIAL_SYNC_SOURCE_KIND', 'uri'),
       source_uri: material_sync_source_uri,
       source_path: ENV['MATERIAL_SYNC_SOURCE_PATH'],
-      source_file_id: material_sync_source_file_id,
+      source_file_id: ENV['MATERIAL_SYNC_SOURCE_FILE_ID'],
       profile: ENV.fetch('MATERIAL_SYNC_SOURCE_PROFILE', 'legacy_drive'),
       enabled: ENV.fetch('MATERIAL_SYNC_SOURCE_ENABLED', 'true') != 'false',
-      default_tag_name: ENV['MATERIAL_SYNC_SOURCE_TAG_NAME'],
+      default_tag_name: material_sync_source_tag_name,
       export_path_prefix: ENV['MATERIAL_SYNC_EXPORT_PATH_PREFIX'])
   source.save!
 end

backend/lib/tasks/sync_materials.rake

@@ -5,7 +5,6 @@ namespace :materials do
     message = [
       "materials:sync imported=#{ result.imported }",
       "updated=#{ result.updated }",
-      "unchanged=#{ result.unchanged }",
       "suppressed=#{ result.suppressed }",
       "failed=#{ result.failed }"
     ].join(' ')

backend/spec/factories/post_tag_sections.rb

@@ -1,8 +0,0 @@
-FactoryBot.define do
-  factory :post_tag_section do
-    association :post
-    association :tag
-    begin_ms { 1_000 }
-    end_ms { 2_000 }
-  end
-end

backend/spec/factories/post_tags.rb

@@ -1,6 +0,0 @@
-FactoryBot.define do
-  factory :post_tag do
-    association :post
-    association :tag
-  end
-end

backend/spec/factories/posts.rb

@@ -1,8 +0,0 @@
-FactoryBot.define do
-  factory :post do
-    sequence(:url) { |n| "https://example.com/factory-post-#{ n }" }
-    title { 'factory post' }
-    thumbnail_base { nil }
-    uploaded_user { nil }
-  end
-end

backend/spec/models/material_spec.rb

@@ -1,19 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Material, type: :model do
-  let(:user) { create(:user, :member) }
-
-  it 'allows only material source kinds, not suppression prefix kinds' do
-    material = described_class.new(url: 'https://example.com/material',
-                                   source_kind: 'google_drive_path_prefix',
-                                   source_path: '素材/危険',
-                                   created_by_user: user,
-                                   updated_by_user: user)
-
-    expect(material).not_to be_valid
-    expect(material.errors[:source_kind]).to be_present
-
-    material.source_kind = 'google_drive_path'
-    expect(material).to be_valid
-  end
-end

backend/spec/models/post_tag_spec.rb

@@ -1,41 +0,0 @@
-RSpec.describe PostTag, type: :model do
-  describe '#sections' do
-    it 'loads sections by post_id and tag_id' do
-      post_tag = create(:post_tag)
-      section = create(:post_tag_section,
-                       post: post_tag.post,
-                       tag: post_tag.tag,
-                       begin_ms: 1000,
-                       end_ms: 2000)
-
-      expect(post_tag.sections).to contain_exactly(section)
-    end
-
-    it 'does not load sections for another tag on the same post' do
-      post = create(:post)
-      tag = create(:tag)
-      other_tag = create(:tag)
-
-      post_tag = create(:post_tag, post:, tag:)
-      create(:post_tag_section,
-             post:,
-             tag: other_tag,
-             begin_ms: 1000,
-             end_ms: 2000)
-
-      expect(post_tag.sections).to be_empty
-    end
-
-    it 'allows open-ended sections' do
-      post_tag = create(:post_tag)
-      section = create(:post_tag_section,
-                       post: post_tag.post,
-                       tag: post_tag.tag,
-                       begin_ms: 1000,
-                       end_ms: nil)
-
-      expect(section).to be_valid
-      expect(post_tag.sections).to contain_exactly(section)
-    end
-  end
-end

backend/spec/models/tag_implication_spec.rb

@@ -1,36 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe TagImplication, type: :model do
-  it 'rejects a parent tag that would create a cycle' do
-    child = create(:tag, name: 'tag_implication_cycle_child')
-    parent = create(:tag, name: 'tag_implication_cycle_parent')
-
-    described_class.create!(tag: child, parent_tag: parent)
-
-    implication = described_class.new(tag: parent, parent_tag: child)
-
-    expect(implication).not_to be_valid
-    expect(implication.errors[:parent_tag_id]).to include(
-      '親タグに子孫タグを指定すると循環します．'
-    )
-    expect(implication.errors[:base]).to be_present
-  end
-
-  it 'terminates even when existing data already contains a cycle' do
-    child = create(:tag, name: 'tag_implication_existing_cycle_child')
-    parent = create(:tag, name: 'tag_implication_existing_cycle_parent')
-    ancestor = create(:tag, name: 'tag_implication_existing_cycle_ancestor')
-
-    described_class.create!(tag: parent, parent_tag: ancestor)
-    described_class.insert_all!(
-      [
-        { tag_id: ancestor.id, parent_tag_id: parent.id,
-          created_at: Time.current, updated_at: Time.current }
-      ]
-    )
-
-    implication = described_class.new(tag: child, parent_tag: parent)
-
-    expect(implication).to be_valid
-  end
-end

backend/spec/models/tag_spec.rb

@@ -19,95 +19,6 @@ RSpec.describe Tag, type: :model do
         expect(error.tag_names).to eq([deprecated_tag.name])
       }
     end
-
-    it 'rejects invalid section literals instead of treating them as zero' do
-      expect {
-        described_class.normalise_tags!(
-          ['normalise_invalid_section[1:aa-2:00]'],
-          with_sections: true
-        )
-      }.to raise_error(Tag::SectionLiteralParseError)
-    end
-
-    it 'parses open-ended section literals' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[1:00-]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections).fetch(tag.id)).to eq([[60_000, nil]])
-    end
-
-    it 'parses omitted begin as zero' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[-1:00]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections).fetch(tag.id)).to eq([[0, 60_000]])
-    end
-
-    it 'treats fully open section literals as plain tags' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[-]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections)[tag.id]).to be_nil
-    end
-
-    it 'treats [0:00-] as a plain tag' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[0:00-]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections)[tag.id]).to be_nil
-    end
-
-    it 'expands zero-width sections to one millisecond' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[1:00-1:00]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections).fetch(tag.id)).to eq([[60_000, 60_001]])
-    end
-
-    it 'swaps reversed section boundaries' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[2:00-1:00]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections).fetch(tag.id)).to eq([[60_000, 120_000]])
-    end
-
-    it 'merges open-ended sections over later bounded sections' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[1:00-][2:00-3:00]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections).fetch(tag.id)).to eq([[60_000, nil]])
-    end
-
-    it 'merges adjacent bounded and open-ended sections' do
-      result = described_class.normalise_tags!(
-        ['伊地知ニジカ[1:00-3:00][3:00-]'],
-        with_sections: true
-      )
-
-      tag = result.fetch(:tags).find { _1.name == '伊地知ニジカ' }
-      expect(result.fetch(:sections).fetch(tag.id)).to eq([[60_000, nil]])
-    end
   end
 
   describe '.expand_parent_tags' do
@@ -143,17 +54,7 @@ RSpec.describe Tag, type: :model do
       first = create(:tag, name: 'expand_cycle_first')
       second = create(:tag, name: 'expand_cycle_second')
       TagImplication.create!(tag: first, parent_tag: second)
-      now = Time.current
-      TagImplication.insert_all!(
-        [
-          {
-            tag_id: second.id,
-            parent_tag_id: first.id,
-            created_at: now,
-            updated_at: now
-          }
-        ]
-      )
+      TagImplication.create!(tag: second, parent_tag: first)
 
       expect(described_class.expand_parent_tags([first])).to contain_exactly(first, second)
     end

backend/spec/requests/materials_spec.rb

@@ -64,36 +64,27 @@ RSpec.describe 'Materials API', type: :request do
         'name' => 'material_index_b',
         'category' => 'material'
       )
+      expect(row['created_by_user']).to include(
+        'id' => member_user.id,
+        'name' => member_user.name
+      )
       expect(row['content_type']).to eq('image/png')
-      expect(row['media_kind']).to eq('image')
     end
 
-    it 'filters materials by q' do
-      get '/materials', params: { q: 'material_index_a' }
+    it 'filters materials by tag_id' do
+      get '/materials', params: { tag_id: material_a.tag_id }
 
       expect(response).to have_http_status(:ok)
       expect(json['count']).to eq(1)
       expect(response_materials.map { |m| m['id'] }).to eq([material_a.id])
     end
 
-    it 'filters materials by tag_state' do
-      untagged =
-          build_material(tag: nil, user: member_user,
-                         file: dummy_upload(filename: 'untagged.png'))
-
-      get '/materials', params: { tag_state: 'untagged' }
+    it 'filters materials by parent_id' do
+      get '/materials', params: { parent_id: material_a.id }
 
       expect(response).to have_http_status(:ok)
       expect(json['count']).to eq(1)
-      expect(response_materials.map { |m| m['id'] }).to eq([untagged.id])
-    end
-
-    it 'filters materials by media_kind' do
-      get '/materials', params: { media_kind: 'image' }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(2)
-      expect(response_materials.map { |m| m['media_kind'] }).to all(eq('image'))
+      expect(response_materials.map { |m| m['id'] }).to eq([material_b.id])
     end
 
     it 'paginates and keeps total count' do
@@ -113,68 +104,6 @@ RSpec.describe 'Materials API', type: :request do
       expect(response_materials.size).to eq(1)
       expect(response_materials.first['id']).to eq(material_b.id)
     end
-
-    it 'filters by descendant tags and returns stable parent tag groups' do
-      root =
-          Tag.create!(tag_name: TagName.create!(name: 'material_scope_root'),
-                      category: :material)
-      child_b =
-          Tag.create!(tag_name: TagName.create!(name: 'material_scope_b'),
-                      category: :material)
-      child_a =
-          Tag.create!(tag_name: TagName.create!(name: 'material_scope_a'),
-                      category: :material)
-      deprecated =
-          Tag.create!(tag_name: TagName.create!(name: 'material_scope_old'),
-                      category: :material,
-                      deprecated_at: Time.current)
-      grandchild =
-          Tag.create!(tag_name: TagName.create!(name: 'material_scope_grandchild'),
-                      category: :material)
-      root_material =
-          build_material(tag: root, user: member_user,
-                         file: dummy_upload(filename: 'root.png'))
-      child_a_material =
-          build_material(tag: child_a, user: member_user,
-                         file: dummy_upload(filename: 'child_a.png'))
-      grandchild_material =
-          build_material(tag: grandchild, user: member_user,
-                         file: dummy_upload(filename: 'grandchild.png'))
-
-      TagImplication.create!(parent_tag: root, tag: child_b)
-      TagImplication.create!(parent_tag: root, tag: child_a)
-      TagImplication.create!(parent_tag: child_b, tag: deprecated)
-      TagImplication.create!(parent_tag: deprecated, tag: grandchild)
-
-      get '/materials',
-          params: { tag_id: root.id, include_descendants: '1',
-                    group_by: 'parent_tag', sort: 'id', direction: 'asc' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response_materials.map { |m| m['id'] })
-        .to include(root_material.id, child_a_material.id, grandchild_material.id)
-      expect(json['tag_scope']).to eq(
-        'tag' => {
-          'id' => root.id,
-          'name' => 'material_scope_root',
-          'category' => 'material'
-        },
-        'include_descendants' => true
-      )
-      expect(json['groups'].map { |group| group.dig('tag', 'name') })
-        .to eq(['material_scope_a', 'material_scope_b', 'material_scope_root'])
-      expect(json['groups'].find { |group| group.dig('tag', 'id') == child_b.id }
-        .fetch('material_ids')).to eq([grandchild_material.id])
-    end
-
-    it 'returns nil tag_scope when tag_id is unknown' do
-      get '/materials', params: { tag_id: 999_999, group_by: 'parent_tag' }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['tag_scope']).to be_nil
-      expect(json['groups']).to eq([])
-      expect(response_materials).to eq([])
-    end
   end
 
   describe 'GET /materials/:id' do
@@ -599,8 +528,9 @@ RSpec.describe 'Materials API', type: :request do
       expect(response.body.b).not_to include('素材/b.png'.b)
     end
 
-    it 'does not include disabled export items' do
-      material_b.material_export_items.first.update!(enabled: false)
+    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' }
 
@@ -610,78 +540,62 @@ RSpec.describe 'Materials API', type: :request do
     end
   end
 
-  describe 'GET /materials/versions' do
+  describe 'PATCH /materials/:id/suppress_file' do
     let!(:tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_history'), category: :material)
+      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: 'history.png'))
+      build_material(tag:, user: member_user, file: dummy_upload(filename: 'suppress.png'))
     end
 
-    it 'returns material versions in reverse chronological order' do
+    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)
-      material.update!(url: 'https://example.com/history')
-      MaterialVersionRecorder.record!(material:, event_type: :update,
-                                      created_by_user: admin_user)
-
-      get '/materials/versions', params: { material_id: material.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(json['count']).to eq(2)
-      versions = json.fetch('versions')
-      expect(versions.map { |v| v['version_no'] }).to eq([2, 1])
-      expect(versions.first).to include(
-        'material_id' => material.id,
-        'event_type' => 'update',
-        'tag_name' => 'material_history',
-        'file_filename' => 'history.png',
-        'url' => 'https://example.com/history'
-      )
-      expect(versions.first['created_by_user']).to include('id' => admin_user.id)
-    end
-
-    it 'filters material versions by tag and event_type' do
-      MaterialVersionRecorder.record!(material:, event_type: :create,
-                                      created_by_user: member_user)
-
-      get '/materials/versions', params: {
-        tag: 'material_history',
-        event_type: 'create'
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('versions').map { |v| v['material_id'] }).to include(material.id)
-      expect(json.fetch('versions').map { |v| v['event_type'] }).to all(eq('create'))
-    end
-  end
-
-  describe 'material sync suppressions' do
-    it 'requires member permission for index' do
-      sign_out
-
-      get '/materials/suppressions'
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'creates source suppression as member' do
-      sign_in_as(member_user)
 
       expect do
-        post '/materials/suppressions', params: {
-          source_kind: 'google_drive_path_prefix',
-          drive_path: '伊地知ニジカ/危険素材',
-          reason: 'copyright_high_risk'
-        }
-      end.to change(MaterialSyncSuppression, :count).by(1)
+        patch "/materials/#{ material.id }/suppress_file",
+              params: { reason: 'copyright_high_risk' }
+      end.to change(MaterialVersion, :count).by(1)
 
-      expect(response).to have_http_status(:created)
-      expect(json).to include(
-        'source_kind' => 'google_drive_path_prefix',
-        'drive_path' => '伊地知ニジカ/危険素材',
-        'normalized_source_key' => 'google_drive_path_prefix:伊地知ニジカ/危険素材'
-      )
+      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
 

backend/spec/requests/posts_spec.rb

@@ -1,5 +1,4 @@
 require 'rails_helper'
-require 'base64'
 require 'set'
 
 include ActiveSupport::Testing::TimeHelpers
@@ -9,11 +8,6 @@ RSpec.describe 'Posts API', type: :request do
   # resized_thumbnail! が MiniMagick 依存でコケやすいので request spec ではスタブしとくのが無難。
   before do
     allow_any_instance_of(Post).to receive(:resized_thumbnail!).and_return(true)
-    allow(Post).to receive(:resized_thumbnail_attachment).and_return(
-      io: StringIO.new('dummy'),
-      filename: 'resized_thumbnail.jpg',
-      content_type: 'image/jpeg'
-    )
   end
 
   def create_nico_tag!(name)
@@ -25,18 +19,6 @@ RSpec.describe 'Posts API', type: :request do
     Rack::Test::UploadedFile.new(StringIO.new('dummy'), 'image/jpeg', original_filename: 'dummy.jpg')
   end
 
-  def real_thumbnail_upload
-    gif =
-        Base64.decode64(
-            'R0lGODdhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=')
-
-    Rack::Test::UploadedFile.new(
-      StringIO.new(gif),
-      'image/gif',
-      original_filename: 'thumbnail.gif'
-    )
-  end
-
   def post_write_params params = { }
     { parent_post_ids: '' }.merge(params)
   end
@@ -54,7 +36,6 @@ RSpec.describe 'Posts API', type: :request do
             title: post.title,
             url: post.url,
             thumbnail_base: post.thumbnail_base,
-            video_ms: post.video_ms,
             tags: post.snapshot_tag_names.join(' '),
             parent_post_ids: post.snapshot_parent_post_ids.join(' '),
             original_created_from: post.original_created_from,
@@ -146,22 +127,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(all_tag_names).to include("spec_tag")
     end
 
-    it 'keeps children and sections keys in non-detail tag responses' do
-      PostTagSection.create!(post: hit_post, tag:, begin_ms: 1_000, end_ms: nil)
-
-      get '/posts'
-
-      expect(response).to have_http_status(:ok)
-
-      hit_json = json.fetch('posts').find { |post| post['id'] == hit_post.id }
-      tag_json = hit_json.fetch('tags').find { |item| item['name'] == 'spec_tag' }
-
-      expect(tag_json.fetch('children')).to eq([])
-      expect(tag_json.fetch('sections')).to eq([
-        { 'begin_ms' => 1_000, 'end_ms' => nil }
-      ])
-    end
-
     context "when q is provided" do
       it "filters posts by q (hit case)" do
         get "/posts", params: { tags: "spec_tag" }
@@ -731,66 +696,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(json['tags'][0]).to have_key('name')
     end
 
-    it '201 when posting manually with a thumbnail' do
-      sign_in_as(member)
-      allow(Post).to receive(:resized_thumbnail_attachment).and_call_original
-
-      post '/posts', params: post_write_params(
-        title: 'thumbnail post',
-        url: 'https://example.com/thumbnail-post',
-        tags: 'spec_tag',
-        thumbnail: real_thumbnail_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      post_record = Post.find(json.fetch('id'))
-      expect(post_record.thumbnail).to be_attached
-      expect(post_record.thumbnail.blob.content_type).to eq('image/jpeg')
-      expect { post_record.thumbnail.download }.not_to raise_error
-    end
-
-    it 'resizes the thumbnail before the create transaction begins' do
-      sign_in_as(member)
-
-      open_transactions = []
-      baseline_open_transactions = Post.connection.open_transactions
-      allow(Post).to receive(:resized_thumbnail_attachment) do |_upload|
-        open_transactions << Post.connection.open_transactions
-        { io: StringIO.new('dummy'),
-          filename: 'resized_thumbnail.jpg',
-          content_type: 'image/jpeg' }
-      end
-
-      post '/posts', params: post_write_params(
-        title: 'transaction post',
-        url: 'https://example.com/transaction-post',
-        tags: 'spec_tag',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      expect(open_transactions).to eq([baseline_open_transactions])
-    end
-
-    it 'returns 422 and does not create a post when thumbnail resize fails' do
-      sign_in_as(member)
-      allow(Post).to receive(:resized_thumbnail_attachment).and_raise(MiniMagick::Error)
-
-      expect {
-        post '/posts', params: post_write_params(
-          title: 'broken thumbnail post',
-          url: 'https://example.com/broken-thumbnail-post',
-          tags: 'spec_tag',
-          thumbnail: dummy_upload
-        )
-      }.not_to change(Post, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-        'thumbnail' => ['サムネイル画像の変換に失敗しました．']
-      )
-    end
-
     it '201 and creates post + tags when member and tags have aliases' do
       sign_in_as(member)
 
@@ -862,198 +767,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(saved_names).not_to include('deprecated_parent', 'deprecated_grandparent')
     end
 
-    it 'returns validation error for an invalid section literal' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'invalid section literal',
-        url: 'https://example.com/invalid-section-literal',
-        tags: 'spec_tag[1:aa-2:00]',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json).to include(
-        'type' => 'validation_error',
-        'message' => '入力内容を確認してください．'
-      )
-      expect(json.fetch('errors')).to include(
-        'tags' => ['タグ区間の記法が不正です．']
-      )
-    end
-
-    it 'creates a video post with duration' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'video post',
-        url: 'https://example.com/video-post',
-        tags: '動画 spec_tag',
-        duration: '3:00.500',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      expect(Post.find(json.fetch('id')).video_ms).to eq(180_500)
-      expect(json.fetch('video_ms')).to eq(180_500)
-    end
-
-    it 'creates a video post with number input duration seconds' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'video post seconds',
-        url: 'https://example.com/video-post-seconds',
-        tags: '動画 spec_tag',
-        duration: '180.5',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      expect(Post.find(json.fetch('id')).video_ms).to eq(180_500)
-      expect(json.fetch('video_ms')).to eq(180_500)
-    end
-
-    it 'clears video_ms when the saved tags do not include 動画' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'non video post',
-        url: 'https://example.com/non-video-post',
-        tags: 'spec_tag',
-        duration: '3:00',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      expect(Post.find(json.fetch('id')).video_ms).to be_nil
-    end
-
-    it 'returns validation error when a bounded section exceeds duration' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'too long section',
-        url: 'https://example.com/too-long-section',
-        tags: '動画 伊地知ニジカ[2:50-3:10]',
-        duration: '3:00',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-        'video_ms' => ['タグ区間の終端が動画時間を超えてゐます．']
-      )
-    end
-
-    it 'saves open-ended sections with end_ms NULL' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'open ended section literal',
-        url: 'https://example.com/open-ended-section-literal',
-        tags: '動画 伊地知ニジカ[1:00-]',
-        duration: '3:00',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-
-      created_post = Post.find(json.fetch('id'))
-      tag = Tag.joins(:tag_name).find_by!(tag_names: { name: '伊地知ニジカ' })
-      section = PostTagSection.find_by!(post: created_post, tag:)
-
-      expect(section.begin_ms).to eq(60_000)
-      expect(section.end_ms).to be_nil
-    end
-
-    it 'does not save sections for [-]' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'fully open section literal',
-        url: 'https://example.com/fully-open-section-literal',
-        tags: '伊地知ニジカ[-]',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-
-      created_post = Post.find(json.fetch('id'))
-      tag = Tag.joins(:tag_name).find_by!(tag_names: { name: '伊地知ニジカ' })
-      expect(PostTagSection.find_by(post: created_post, tag:)).to be_nil
-    end
-
-    it 'does not save sections for [0:00-]' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'zero open ended section literal',
-        url: 'https://example.com/zero-open-ended-section-literal',
-        tags: '伊地知ニジカ[0:00-]',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-
-      created_post = Post.find(json.fetch('id'))
-      tag = Tag.joins(:tag_name).find_by!(tag_names: { name: '伊地知ニジカ' })
-      expect(PostTagSection.find_by(post: created_post, tag:)).to be_nil
-    end
-
-    it 'returns end_ms null for open-ended sections in show response' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'show open ended section literal',
-        url: 'https://example.com/show-open-ended-section-literal',
-        tags: '動画 伊地知ニジカ[1:00-]',
-        duration: '3:00',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-
-      get "/posts/#{ json.fetch('id') }"
-
-      expect(response).to have_http_status(:ok)
-      tag_json = json.fetch('tags').find { |item| item['name'] == '伊地知ニジカ' }
-      expect(tag_json.fetch('sections')).to eq([
-        { 'begin_ms' => 60_000, 'end_ms' => nil }
-      ])
-    end
-
-    it 'allows open-ended sections when begin is within duration' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'valid open ended section literal',
-        url: 'https://example.com/valid-open-ended-section-literal',
-        tags: '動画 伊地知ニジカ[1:00-]',
-        duration: '3:00',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-    end
-
-    it 'rejects open-ended sections when begin equals duration' do
-      sign_in_as(member)
-
-      post '/posts', params: post_write_params(
-        title: 'invalid open ended section literal',
-        url: 'https://example.com/invalid-open-ended-section-literal',
-        tags: '動画 伊地知ニジカ[3:00-]',
-        duration: '3:00',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-        'video_ms' => ['タグ区間の開始が動画時間以上です．']
-      )
-    end
-
     context "when nico tag already exists in tags" do
       before do
         Tag.find_undiscard_or_create_by!(

backend/spec/requests/tag_children_spec.rb

@@ -56,17 +56,6 @@ RSpec.describe "TagChildren", type: :request do
 
         expect(response).to have_http_status(:no_content)
       end
-
-      it 'returns 422 and does not create relation when the new link makes a cycle' do
-        TagImplication.create!(tag: parent, parent_tag: child)
-
-        expect {
-          do_request
-        }.not_to change(TagImplication, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(TagImplication.where(tag: child, parent_tag: parent)).not_to exist
-      end
     end
 
     context "when Tag.find raises (invalid ids)" do

backend/spec/requests/tags_spec.rb

@@ -581,58 +581,6 @@ RSpec.describe 'Tags API', type: :request do
         expect(response).to have_http_status(:ok)
         expect(wiki_page.reload.wiki_versions.count).to eq(before_wiki_version_count)
       end
-
-      it 'full update で旧名 alias が残った tag を PATCH で旧名へ戻せる' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'patch_roundtrip_target',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: '',
-          deprecated: '0',
-        }
-
-        expect(response).to have_http_status(:ok)
-        expect(TagName.find_by!(name: 'spec_tag').canonical).to eq(tag.reload.tag_name)
-
-        patch "/tags/#{ tag.id }", params: { name: 'spec_tag' }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(tag.name).to eq('spec_tag')
-        expect(tag.tag_name.canonical_id).to be_nil
-        expect(TagName.find_by!(name: 'patch_roundtrip_target').canonical).to eq(tag.tag_name)
-      end
-
-      it '別 tag の正規名には変更できない' do
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'patch collision wiki',
-                created_by_user: member_user,
-                message: 'init')
-
-        patch "/tags/#{ tag.id }", params: { name: 'unknown' }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-          'name' => ['その名前は既に使はれてゐます．']
-        )
-
-        expect(tag.reload.name).to eq('spec_tag')
-        expect(tag.tag_name.aliases.map(&:name)).to contain_exactly('unko')
-        expect(wiki_page.reload.tag_name).to eq(tag.tag_name)
-      end
-
-      it 'system tag の name は変更できない' do
-        system_tag = Tag.bot
-
-        patch "/tags/#{ system_tag.id }", params: { name: 'patch_system_tag_renamed' }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(system_tag.reload.name).to eq('bot操作')
-      end
     end
   end
 
@@ -797,17 +745,7 @@ RSpec.describe 'Tags API', type: :request do
       )
       TagImplication.create!(tag: first, parent_tag: root_material)
       TagImplication.create!(tag: second, parent_tag: first)
-      now = Time.current
-      TagImplication.insert_all!(
-        [
-          {
-            tag_id: first.id,
-            parent_tag_id: second.id,
-            created_at: now,
-            updated_at: now
-          }
-        ]
-      )
+      TagImplication.create!(tag: first, parent_tag: second)
 
       get '/tags/with-depth', params: { parent: root_material.id }
 
@@ -1091,42 +1029,6 @@ RSpec.describe 'Tags API', type: :request do
         expect(versions.second.created_by_user_id).to eq(member_user.id)
       end
 
-      it '同じ tag の旧 alias へ戻しても rename できる' do
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_roundtrip_b',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: '',
-          deprecated: '0',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'spec_tag',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: '',
-          deprecated: '0',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(tag.name).to eq('spec_tag')
-        expect(TagName.find_by!(name: 'put_roundtrip_b').canonical).to eq(tag.tag_name)
-        expect(tag.tag_name.aliases.map(&:name)).to contain_exactly('put_roundtrip_b', 'unko')
-        expect(tag.tag_name.aliases.map(&:name)).not_to include('spec_tag')
-        expect(alias_tn.reload.canonical).to eq(tag.tag_name)
-
-        version = tag.tag_versions.order(:version_no).last
-
-        expect(version.event_type).to eq('update')
-        expect(version.name).to eq('spec_tag')
-        expect(version.aliases.split).to contain_exactly('put_roundtrip_b', 'unko')
-      end
-
       it 'parent tag の snapshot も作成する' do
         old_parent = Tag.create!(
           tag_name: TagName.create!(name: 'put_snapshot_old_parent'),
@@ -1251,48 +1153,6 @@ RSpec.describe 'Tags API', type: :request do
         )
       end
 
-      it 'wiki を持つ tag を旧 alias へ戻しても wiki を新 canonical へ移す' do
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'wiki body before',
-                created_by_user: member_user,
-                message: 'init')
-
-        expect {
-          put "/tags/#{ tag.id }", params: {
-            name: 'put_wiki_roundtrip_b',
-            category: 'general',
-            aliases: 'unko',
-            parent_tags: '',
-            deprecated: '0',
-          }
-
-          put "/tags/#{ tag.id }", params: {
-            name: 'spec_tag',
-            category: 'general',
-            aliases: 'unko',
-            parent_tags: '',
-            deprecated: '0',
-          }
-        }
-            .to change(TagVersion, :count).by(3)
-            .and change(WikiVersion, :count).by(2)
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-
-        expect(wiki_page.reload.tag_name).to eq(tag.tag_name)
-        expect(TagName.find_by!(name: 'put_wiki_roundtrip_b').wiki_page).to be_nil
-        expect(TagName.find_by!(name: 'put_wiki_roundtrip_b').canonical).to eq(tag.tag_name)
-
-        versions = wiki_page.wiki_versions.order(:version_no).last(2)
-
-        expect(versions.map(&:event_type)).to eq(['update', 'update'])
-        expect(versions.map(&:title)).to eq(['put_wiki_roundtrip_b', 'spec_tag'])
-      end
-
       it '別名を他 tag から奪った場合、奪はれた側の tag version も作成する' do
         old_owner = Tag.create!(
           tag_name: TagName.create!(name: 'put_alias_old_owner'),
@@ -1331,49 +1191,9 @@ RSpec.describe 'Tags API', type: :request do
         expect(old_owner_versions.second.aliases.split).not_to include('put_stolen_alias')
       end
 
-      it '別 tag の alias 名を rename で奪へる' do
-        old_owner = Tag.create!(
-          tag_name: TagName.create!(name: 'put_alias_collision_owner'),
-          category: :general
-        )
-        stolen_alias = TagName.create!(
-          name: 'put_alias_collision_name',
-          canonical: old_owner.tag_name
-        )
-        wiki_page =
-            Wiki::Commit.create_content!(
-                tag_name: tag.tag_name,
-                body: 'put collision wiki',
-                created_by_user: member_user,
-                message: 'init')
-
-        put "/tags/#{ tag.id }", params: {
-          name: 'put_alias_collision_name',
-          category: 'general',
-          aliases: 'unko',
-          parent_tags: '',
-          deprecated: '0',
-        }
-
-        expect(response).to have_http_status(:ok)
-
-        tag.reload
-        old_owner.reload
-        stolen_alias.reload
-
-        expect(tag.name).to eq('put_alias_collision_name')
-        expect(stolen_alias.canonical_id).to be_nil
-        expect(TagName.find_by!(name: 'spec_tag').canonical).to eq(tag.tag_name)
-        expect(old_owner.tag_name.aliases.map(&:name)).not_to include('put_alias_collision_name')
-
-        old_owner_versions = old_owner.tag_versions.order(:version_no)
-
-        expect(old_owner_versions.last.event_type).to eq('update')
-        expect(old_owner_versions.last.aliases.split).not_to include('put_alias_collision_name')
-        expect(wiki_page.reload.tag_name).to eq(tag.tag_name)
-      end
-
       it 'parent_tags に指定すると循環する tag は 422 にする' do
+        pending '#332 で対応予定'
+
         child = Tag.create!(
           tag_name: TagName.create!(name: 'put_cycle_child'),
           category: :general

backend/spec/services/material_file_sha256_spec.rb

@@ -1,23 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe MaterialFileSha256 do
-  describe '.metadata_sha256' do
-    it 'reads sha256 from Hash metadata' do
-      blob = instance_double(ActiveStorage::Blob, metadata: { 'sha256' => 'abc123' })
-
-      expect(described_class.metadata_sha256(blob)).to eq('abc123')
-    end
-
-    it 'reads sha256 from JSON string metadata' do
-      blob = instance_double(ActiveStorage::Blob, metadata: '{"sha256":"abc123"}')
-
-      expect(described_class.metadata_sha256(blob)).to eq('abc123')
-    end
-
-    it 'returns nil for invalid metadata' do
-      blob = instance_double(ActiveStorage::Blob, metadata: '{')
-
-      expect(described_class.metadata_sha256(blob)).to be_nil
-    end
-  end
-end

backend/spec/services/material_sync_importer_spec.rb

@@ -1,128 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe MaterialSyncImporter do
-  let(:user) { create(:user, :member) }
-  let(:tag) { Tag.create!(tag_name: TagName.create!(name: 'sync_tag'), category: :material) }
-
-  def tempfile_for body
-    Tempfile.new(['material-sync-importer', '.png']).tap do |file|
-      file.binmode
-      file.write(body)
-      file.rewind
-    end
-  end
-
-  it 'creates an untagged material from a sync candidate with file_downloader' do
-    result =
-        described_class.import!(
-            source_kind: 'google_drive_file',
-            source_path: '素材/a.png',
-            source_file_id: 'drive-file-a',
-            normalized_source_key: 'google_drive_file:drive-file-a',
-            filename: 'a.png',
-            content_type: 'image/png',
-            file_sha256: Digest::SHA256.hexdigest('sync-body'),
-            file_downloader: -> { tempfile_for('sync-body') },
-            export_path: '素材/a.png',
-            tag: nil,
-            url: nil,
-            created_by_user: user,
-            updated_by_user: user)
-
-    material = result.material.reload
-    expect(result.action).to eq(:imported)
-    expect(material.tag).to be_nil
-    expect(material.url).to be_nil
-    expect(material.file).to be_attached
-    expect(material.file.blob.filename.to_s).to eq('a.png')
-    expect(material.material_export_items.first.export_path).to eq('素材/a.png')
-  end
-
-  it 'does not clear a human-assigned tag or URL on existing Drive sync' do
-    material =
-        Material.create!(tag:, url: 'https://example.com/human',
-                         source_kind: 'google_drive_file',
-                         source_path: '素材/a.png',
-                         source_file_id: 'drive-file-a',
-                         created_by_user: user,
-                         updated_by_user: user)
-    material.file.attach(
-        io: StringIO.new('same-body'),
-        filename: 'a.png',
-        content_type: 'image/png')
-    material.file.blob.metadata['sha256'] = Digest::SHA256.hexdigest('same-body')
-    material.file.blob.save!
-    MaterialExportItem.create!(material:,
-                               profile: 'legacy_drive',
-                               export_path: '素材/a.png',
-                               created_by_user: user)
-
-    result =
-        described_class.import!(
-            source_kind: 'google_drive_file',
-            source_path: '素材/a.png',
-            source_file_id: 'drive-file-a',
-            filename: 'a.png',
-            content_type: 'image/png',
-            file_sha256: Digest::SHA256.hexdigest('same-body'),
-            export_path: '素材/a.png',
-            tag: nil,
-            url: nil,
-            updated_by_user: user)
-
-    expect(result.action).to eq(:unchanged)
-    expect(material.reload.tag).to eq(tag)
-    expect(material.url).to eq('https://example.com/human')
-  end
-
-  it 'suppresses a Google Drive candidate by relative path prefix' do
-    MaterialSyncSuppression.create!(source_kind: 'google_drive_path_prefix',
-                                    drive_path: '素材/危険',
-                                    reason: 'copyright_high_risk',
-                                    created_by_user: user)
-
-    result =
-        described_class.import!(
-            source_kind: 'google_drive_file',
-            source_path: '素材/危険/a.png',
-            source_file_id: 'drive-file-b',
-            filename: 'a.png',
-            content_type: 'image/png',
-            file_sha256: Digest::SHA256.hexdigest('blocked-body'),
-            file_downloader: -> { tempfile_for('blocked-body') },
-            export_path: '素材/危険/a.png',
-            updated_by_user: user)
-
-    expect(result.action).to eq(:suppressed)
-    expect(result.suppression.normalized_source_key)
-      .to eq('google_drive_path_prefix:素材/危険')
-    expect(Material.find_by(source_file_id: 'drive-file-b')).to be_nil
-  end
-
-  it 'rechecks import blocks after downloaded file sha256 is known' do
-    MaterialImportBlock.create!(match_kind: 'sha256',
-                                sha256: Digest::SHA256.hexdigest('blocked-body'),
-                                reason: 'copyright_high_risk',
-                                created_by_user: user)
-    blob_count = ActiveStorage::Blob.count
-
-    expect do
-      result =
-          described_class.import!(
-              source_kind: 'google_drive_file',
-              source_path: '素材/blocked.png',
-              source_file_id: 'drive-file-blocked',
-              filename: 'blocked.png',
-              content_type: 'image/png',
-              file_downloader: -> { tempfile_for('blocked-body') },
-              export_path: '素材/blocked.png',
-              updated_by_user: user)
-
-      expect(result.action).to eq(:suppressed)
-      expect(result.suppression.reason).to eq('copyright_high_risk')
-    end.not_to change(Material, :count)
-
-    expect(ActiveStorage::Blob.count).to eq(blob_count)
-    expect(Material.find_by(source_file_id: 'drive-file-blocked')).to be_nil
-  end
-end

backend/spec/services/material_sync_runner_spec.rb

@@ -1,89 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe MaterialSyncRunner do
-  let(:user) { create(:user, :member) }
-  let(:source) do
-    MaterialSyncSource.create!(
-        name: 'Drive source',
-        source_kind: 'google_drive_path',
-        source_file_id: 'folder-123',
-        profile: 'legacy_drive',
-        created_by_user: user,
-        updated_by_user: user)
-  end
-  let(:drive_client) { instance_double(GoogleDrive::ApiClient) }
-
-  describe '#sync!' do
-    it 'imports google drive path candidates as they are yielded' do
-      first_entry = { id: 'file-1',
-                      name: 'a.png',
-                      mime_type: 'image/png',
-                      relative_path: '素材/a.png',
-                      sha256_checksum: 'sha-a',
-                      web_view_link: 'https://drive.google.com/file/d/file-1/view',
-                      web_content_link: nil }
-      second_entry = { id: 'file-2',
-                       name: 'b.png',
-                       mime_type: 'image/png',
-                       relative_path: '素材/b.png',
-                       sha256_checksum: 'sha-b',
-                       web_view_link: 'https://drive.google.com/file/d/file-2/view',
-                       web_content_link: nil }
-      yielded = []
-
-      allow(GoogleDrive::ApiClient).to receive(:new).and_return(drive_client)
-      allow(drive_client).to receive(:each_material_file_under_folder) do |folder_id, &block|
-        expect(folder_id).to eq('folder-123')
-        block.call(first_entry)
-        expect(yielded).to eq(['素材/a.png'])
-        block.call(second_entry)
-      end
-      allow(MaterialSyncImporter).to receive(:import!) do |candidate|
-        yielded << candidate.fetch(:source_path)
-        instance_double(MaterialSyncImporter::Result,
-                        action: yielded.last == '素材/a.png' ? :imported : :updated)
-      end
-
-      result = described_class.new(source).sync!
-
-      expect(yielded).to eq(['素材/a.png', '素材/b.png'])
-      expect(result.imported).to eq(1)
-      expect(result.updated).to eq(1)
-      expect(result.unchanged).to eq(0)
-      expect(source.reload.last_synced_at).to be_present
-    end
-
-    it 'logs google drive path progress at first item and summary' do
-      entry = { id: 'file-1',
-                name: 'a.png',
-                mime_type: 'image/png',
-                relative_path: '素材/a.png',
-                sha256_checksum: 'sha-a',
-                web_view_link: 'https://drive.google.com/file/d/file-1/view',
-                web_content_link: nil }
-      logged = []
-
-      allow(GoogleDrive::ApiClient).to receive(:new).and_return(drive_client)
-      allow(drive_client).to receive(:each_material_file_under_folder) do |_folder_id, &block|
-        block.call(entry)
-      end
-      allow(MaterialSyncImporter).to receive(:import!)
-        .and_return(instance_double(MaterialSyncImporter::Result, action: :imported))
-      allow(Rails.logger).to receive(:info) { |message| logged << JSON.parse(message) }
-
-      described_class.new(source).sync!
-
-      progress_logs = logged.select { |row| row['folder_id'] == 'folder-123' }
-      expect(progress_logs.map { |row| row['progress'] }).to eq(['scan', 'summary'])
-      expect(progress_logs.last).to include(
-          'material_sync_source_id' => source.id,
-          'material_sync_source_name' => 'Drive source',
-          'scanned_count' => 1,
-          'imported' => 1,
-          'updated' => 0,
-          'unchanged' => 0,
-          'suppressed' => 0,
-          'failed' => 0)
-    end
-  end
-end

frontend/src/App.tsx

@@ -6,7 +6,6 @@ import { BrowserRouter,
 	 Routes,
 	 useLocation } from 'react-router-dom'
 
-import DevModeWatermark from '@/components/DevModeWatermark'
 import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
 import DialogueProvider from '@/components/dialogues/DialogueProvider'
@@ -76,6 +75,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <Route path="suppressions" element={<MaterialSyncSuppressionsPage/>}/>
 	    <Route path=":id" element ={<MaterialDetailPage/>}/>
 	  </Route>
+	  {/* <Route path="/materials/search" element={<MaterialSearchPage/>}/> */}
 	  <Route path="/wiki" element={<WikiSearchPage/>}/>
 	  <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
 	  <Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>
@@ -146,7 +146,6 @@ const App: FC = () => {
   return (
       <>
 	<RouteBlockerOverlay/>
-	{import.meta.env.DEV && <DevModeWatermark/>}
 
 	<BrowserRouter>
 	  <DialogueProvider>
@@ -154,7 +153,7 @@ const App: FC = () => {
 	      <motion.div
 		  layout="position"
 		  transition={{ layout: { duration: .2, ease: 'easeOut' } }}
-		  className="relative flex flex-col h-dvh w-full overflow-y-hidden">
+		  className="flex flex-col h-dvh w-full overflow-y-hidden">
 		<TopNav user={user}/>
 		<RouteTransitionWrapper user={user} setUser={setUser}/>
 	      </motion.div>

frontend/src/components/DevModeWatermark.tsx

@@ -1,46 +0,0 @@
-import nikumaru from '@/assets/fonts/nikumaru.otf'
-
-import type { FC } from 'react'
-
-
-const ROW_COUNT = 8
-const COLUMN_COUNT = 12
-
-
-const DevModeWatermark: FC = () => {
-  return (
-      <div
-	  aria-hidden="true"
-	  className="pointer-events-none select-none fixed inset-0 overflow-hidden z-0">
-	<style>{`
-	  @font-face {
-	    font-family: 'Nikumaru';
-	    src: url(${nikumaru}) format('opentype');
-	  }
-	`}</style>
-	<div className="absolute -inset-32 flex flex-col justify-center gap-12 py-48">
-	  {Array.from ({ length: ROW_COUNT }, (_, rowIndex) => (
-	      <div
-		  key={rowIndex}
-		  className={
-		      'flex min-h-32 items-center gap-12 '
-		      + (rowIndex % 2 === 0 ? 'translate-x-0' : 'translate-x-32')
-		  }>
-		{Array.from ({ length: COLUMN_COUNT }, (_, columnIndex) => (
-		    <span
-			key={columnIndex}
-			className={
-			    'whitespace-nowrap text-3xl font-bold '
-			    + 'tracking-[0.3em] text-neutral-950/5 '
-			    + 'dark:text-white/10'
-			}
-			style={{ fontFamily: 'Nikumaru' }}>
-		      開発モード
-		    </span>))}
-	      </div>))}
-	</div>
-      </div>)
-}
-
-
-export default DevModeWatermark

frontend/src/components/DraggableDroppableTagRow.tsx

@@ -87,13 +87,10 @@ const DraggableDroppableTagRow: FC<Props> = ({ tag, nestLevel, pathKey, parentTa
 	    setDropRef (node)
 	  }}
 	  style={style}
-	  className={cn (
-	      'min-w-0 max-w-full overflow-hidden rounded select-none',
-	      over && 'ring-2 ring-offset-2')}
+	  className={cn ('rounded select-none', over && 'ring-2 ring-offset-2')}
 	  {...attributes}
 	  {...listeners}>
 	<motion.div
-	    className="flex min-w-0 max-w-full items-baseline overflow-hidden"
 	    transition={{ layout: { duration: .2, ease: 'easeOut' } }}
 	    layoutId={`tag-${ sp ? 'sp-' : '' }${ tag.id }`}>
 	  <TagLink tag={tag} nestLevel={nestLevel}/>
@@ -101,4 +98,4 @@ const DraggableDroppableTagRow: FC<Props> = ({ tag, nestLevel, pathKey, parentTa
       </div>)
 }
 
-export default DraggableDroppableTagRow
+export default DraggableDroppableTagRow

frontend/src/components/MaterialSidebar.tsx

@@ -1,43 +1,28 @@
+import { Fragment, useEffect, useRef, useState } from 'react'
 import { useQuery } from '@tanstack/react-query'
-import { useEffect, useRef, useState } from 'react'
 import { useLocation, useNavigate } from 'react-router-dom'
 
-import SidebarComponent from '@/components/layout/SidebarComponent'
 import TagLink from '@/components/TagLink'
-import { fetchMaterialTagTree, parseMaterialFilter } from '@/lib/materials'
+import SidebarComponent from '@/components/layout/SidebarComponent'
 import { materialsKeys } from '@/lib/queryKeys'
-import { cn } from '@/lib/utils'
+import { fetchMaterialTagTree, parseMaterialFilter } from '@/lib/materials'
 
-import type { CSSProperties, Dispatch, FC, ReactNode, SetStateAction } from 'react'
+import type { Dispatch, FC, ReactNode, SetStateAction } from 'react'
 
 import type { MaterialFilter, MaterialSidebarTag, Tag } from '@/types'
 
-const FILTERS: MaterialFilter[] = ['missing', 'present', 'any']
-const FILTER_LABELS: Record<MaterialFilter, string> = { present: '有', missing: '無', any: '全' }
+const FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
 
-
-const px = (value: string): number => {
-  const parsed = Number.parseFloat (value)
-  return Number.isFinite (parsed) ? parsed : 0
-}
-
-
-const verticalChrome = (el: HTMLElement): number => {
-  const style = window.getComputedStyle (el)
-
-  return (
-      px (style.paddingTop)
-      + px (style.paddingBottom)
-      + px (style.borderTopWidth)
-      + px (style.borderBottomWidth))
-}
+const FILTER_LABELS: Record<MaterialFilter, string> = {
+    present: '素材あり',
+    missing: '素材なし',
+    any:     'すべて'}
 
 
 const setChildrenById = (
     tags:     MaterialSidebarTag[],
     targetId: number,
-    children: MaterialSidebarTag[],
-): MaterialSidebarTag[] => (
+    children: MaterialSidebarTag[]): MaterialSidebarTag[] => (
     tags.map (tag => {
       if (tag.id === targetId)
 	return { ...tag, children }
@@ -50,11 +35,8 @@ const setChildrenById = (
 
 
 const materialPath = (
-    tagId: number,
-    materialFilter: MaterialFilter,
-): string =>
-    `/materials?tag_id=${ tagId }&include_descendants=1&group_by=parent_tag`
-    + `&material_filter=${ materialFilter }`
+    tagName: string,
+    materialFilter: MaterialFilter): string => `/materials?q=${ encodeURIComponent (tagName) }&material_filter=${ materialFilter }`
 
 
 const sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
@@ -73,43 +55,33 @@ const sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
     matchedAlias:   null })
 
 
-const tagSelectionShellClass = (selected: boolean): string =>
-    cn (selected
-	? ['rounded-md border border-sky-500 bg-sky-50 px-2 py-1 text-sky-700',
-	   'dark:border-sky-400 dark:bg-sky-950 dark:text-sky-100']
-	: 'px-2 py-1')
-
-
 const updateMaterialFilterQuery = (
     pathname: string,
     locationSearch: string,
     navigate: ReturnType<typeof useNavigate>,
-    materialFilter: MaterialFilter,
-) => {
-  const qs = new URLSearchParams (locationSearch)
-  qs.set ('material_filter', materialFilter)
-  navigate (`${ pathname }${ qs.toString () ? `?${ qs.toString () }` : '' }`)
+    materialFilter: MaterialFilter) => {
+    const qs = new URLSearchParams (locationSearch)
+    qs.set ('material_filter', materialFilter)
+    navigate (`${ pathname }${ qs.toString () ? `?${ qs.toString () }` : '' }`)
 }
 
 
-const MaterialFilterButtons: FC<{ materialFilter: MaterialFilter
-				  onChange:       (materialFilter: MaterialFilter) => void }> = (
-    { materialFilter, onChange },
-) => (
-    <div className="flex flex-wrap gap-2 justify-end md:justify-start flex-center">
-      <label className="my-auto text-sm font-bold">素材：</label>
+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={cn (
-		  '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']))}>
+	      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>)
@@ -117,14 +89,12 @@ const MaterialFilterButtons: FC<{ materialFilter: MaterialFilter
 
 const MaterialTreeNode: FC<{
     materialFilter: MaterialFilter
-    selectedTagId:  number | null
     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, selectedTagId,
-	 setOpenTags, tag }) => {
+}> = ({ materialFilter, nestLevel = 0, onChildren, openTags, setOpenTags, tag }) => {
   const open = Boolean (openTags[tag.id])
   const { data } = useQuery ({
       queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
@@ -137,10 +107,10 @@ const MaterialTreeNode: FC<{
   }, [data, onChildren, open, tag.children.length, tag.id])
 
   return (
-      <>
+      <Fragment>
 	<li>
-	  <div className="flex flex-center">
-	    <div className="flex-none w-4 my-auto">
+	  <div className="flex">
+	    <div className="flex-none w-4">
 	      {tag.hasChildren && (
 		  <button
 		      type="button"
@@ -149,17 +119,14 @@ const MaterialTreeNode: FC<{
 		    {open ? <>&minus;</> : '+'}
 		  </button>)}
 	    </div>
-	    <div className="min-w-0 flex-1 my-auto">
-	      <div className={cn (tagSelectionShellClass (selectedTagId === tag.id),
-				  'min-w-0 truncate')}>
-		<TagLink
-		    tag={sidebarTagToTag (tag)}
-		    nestLevel={nestLevel}
-		    title={tag.name}
-		    withCount={false}
-		    withWiki={false}
-		    to={materialPath (tag.id, materialFilter)}/>
-	      </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>
@@ -171,44 +138,23 @@ const MaterialTreeNode: FC<{
 		      tag={child}
 		      nestLevel={nestLevel + 1}
 		      materialFilter={materialFilter}
-		      selectedTagId={selectedTagId}
 		      openTags={openTags}
 		      setOpenTags={setOpenTags}
 		      onChildren={onChildren}/>))}
 	    </ul>)}
-      </>)
+      </Fragment>)
 }
 
 
-const MobileMaterialTreeNode: FC<{ depth?: number
-				   availableInlineSizePx?: number | null
-				   materialFilter: MaterialFilter
-				   selectedTagId: number | null
-				   onChildren: (tagId: number, children: MaterialSidebarTag[]) =>
-						   void
-				   openTags: Record<number, boolean>
-				   setOpenTags: Dispatch<SetStateAction<Record<number, boolean>>>
-				   tag: MaterialSidebarTag }> = (
-    {
-      depth = 0,
-      availableInlineSizePx = null,
-      materialFilter,
-      onChildren,
-      openTags,
-      selectedTagId,
-      setOpenTags,
-      tag,
-    },
-) => {
+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 tagColumnRef = useRef<HTMLDivElement | null> (null)
-  const chipRef = useRef<HTMLDivElement | null> (null)
-  const buttonRef = useRef<HTMLButtonElement | null> (null)
-  const expansionSlotRef = useRef<HTMLDivElement | null> (null)
-  const expansionBorderRef = useRef<HTMLDivElement | null> (null)
-  const [tagChipInlineSizePx, setTagChipInlineSizePx] = useState<number | null> (null)
-  const [tagLinkInlineSizePx, setTagLinkInlineSizePx] = useState<number | null> (null)
-  const [childAvailableInlineSizePx, setChildAvailableInlineSizePx] = useState<number | null> (null)
   const { data } = useQuery ({
       queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
       queryFn:  () => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
@@ -219,163 +165,50 @@ const MobileMaterialTreeNode: FC<{ depth?: number
       onChildren (tag.id, data)
   }, [data, onChildren, open, tag.children.length, tag.id])
 
-  useEffect (() => {
-    const tagColumn = tagColumnRef.current
-    const chip = chipRef.current
-    if (!(tagColumn) || !(chip))
-      return
-
-    const updateTagInlineSize = () => {
-      const buttonHeight = buttonRef.current?.offsetHeight ?? 0
-      const gap = tag.hasChildren ? px (window.getComputedStyle (tagColumn).rowGap) : 0
-      const columnHeight =
-	  availableInlineSizePx == null
-	  ? tagColumn.clientHeight
-	  : Math.min (tagColumn.clientHeight, availableInlineSizePx)
-      const nextChipInlineSize = Math.max (24, columnHeight - buttonHeight - gap)
-      const nextLinkInlineSize = Math.max (
-	  16,
-	  nextChipInlineSize - verticalChrome (chip),
-      )
-
-      setTagChipInlineSizePx (prev => prev === nextChipInlineSize ? prev : nextChipInlineSize)
-      setTagLinkInlineSizePx (prev => prev === nextLinkInlineSize ? prev : nextLinkInlineSize)
-    }
-
-    updateTagInlineSize ()
-
-    const resizeObserver = new ResizeObserver (() => {
-      updateTagInlineSize ()
-    })
-
-    resizeObserver.observe (tagColumn)
-    resizeObserver.observe (chip)
-
-    if (buttonRef.current)
-      resizeObserver.observe (buttonRef.current)
-
-    return () => {
-      resizeObserver.disconnect ()
-    }
-  }, [availableInlineSizePx, open, tag.hasChildren, tag.children.length])
-
-  useEffect (() => {
-    const expansionSlot = expansionSlotRef.current
-    const expansionBorder = expansionBorderRef.current
-    if (!(expansionSlot) || !(expansionBorder))
-      return
-
-    const updateChildInlineSize = () => {
-      const base =
-	  availableInlineSizePx == null
-	  ? expansionSlot.clientHeight
-	  : availableInlineSizePx
-      const chrome = verticalChrome (expansionSlot) + verticalChrome (expansionBorder)
-      const nextInlineSize = Math.max (24, base - chrome)
-      setChildAvailableInlineSizePx (prev => prev === nextInlineSize ? prev : nextInlineSize)
-    }
-
-    updateChildInlineSize ()
-
-    const resizeObserver = new ResizeObserver (() => {
-      updateChildInlineSize ()
-    })
-
-    resizeObserver.observe (expansionSlot)
-    resizeObserver.observe (expansionBorder)
-
-    return () => {
-      resizeObserver.disconnect ()
-    }
-  }, [availableInlineSizePx, open, tag.children.length])
-
   return (
-      <div className="flex h-full min-h-0 max-h-full flex-row-reverse items-start gap-2
-		      overflow-hidden">
-	<div
-	    ref={tagColumnRef}
-	    className="flex h-full min-h-0 max-h-full flex-col items-center gap-1
-		       overflow-hidden">
+      <div className="flex flex-row-reverse items-start gap-2">
+	<div className="flex flex-col items-center gap-1">
 	  <div
-	      ref={chipRef}
-	      className={cn (
-		  tagSelectionShellClass (selectedTagId === tag.id),
-		  'box-border rounded-xl border px-3 py-2 text-sm shadow-sm',
-		  'min-h-0 overflow-hidden [max-inline-size:var(--tag-chip-inline-size)]',
-		  '[max-height:var(--tag-chip-inline-size)]',
-	      )}
-	      style={{
-		writingMode: 'vertical-rl',
-		'--tag-chip-inline-size': (
-		    tagChipInlineSizePx == null
-		    ? undefined
-		    : `${ tagChipInlineSizePx }px`),
-		'--tag-link-inline-size': (
-		    tagLinkInlineSizePx == null
-		    ? undefined
-		    : `${ tagLinkInlineSizePx }px`),
-	      } as CSSProperties}>
+	      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}
-		truncateOnMobile
 		withCount={false}
 		withWiki={false}
-		to={materialPath (tag.id, materialFilter)}
-		className="block overflow-hidden text-ellipsis whitespace-nowrap
-			   [max-inline-size:var(--tag-link-inline-size)]
-			   [max-height:var(--tag-link-inline-size)]
-			   [&_.tag-marquee]:block
-			   [&_.tag-marquee]:h-full
-			   [&_.tag-marquee]:overflow-hidden
-			   [&_.tag-marquee__static]:h-full
-			   [&_.tag-marquee__static]:overflow-hidden
-			   [&_.tag-marquee__static]:text-ellipsis
-			   [&_.tag-marquee__static]:[text-overflow:ellipsis]"/>
+		to={materialPath (tag.name, materialFilter)}/>
 	  </div>
 	  {tag.hasChildren && (
 	      <button
-		  ref={buttonRef}
 		  type="button"
 		  onClick={() => setOpenTags (prev => ({ ...prev, [tag.id]: !prev[tag.id] }))}
-		  className="flex-none rounded-full border border-stone-300 bg-white
-			     px-2 py-0.5 text-sm text-stone-700 dark:border-stone-700
+		  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
-		ref={expansionSlotRef}
-		className={cn (
-		    'h-full min-h-0 max-h-full overflow-hidden box-border',
-		    depth === 0 ? 'pt-5' : 'pt-3')}>
-	      <div
-		  ref={expansionBorderRef}
-		  className="relative max-h-full overflow-hidden 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">
-		<div className="flex h-full min-h-0 max-h-full flex-row-reverse items-start gap-2
-				overflow-hidden">
-		  <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 h-full min-h-0 max-h-full overflow-hidden">
-			<MobileMaterialTreeNode
-			    tag={child}
-			    depth={depth + 1}
-			    availableInlineSizePx={childAvailableInlineSizePx}
-			    materialFilter={materialFilter}
-			    selectedTagId={selectedTagId}
-			    openTags={openTags}
-			    setOpenTags={setOpenTags}
-			    onChildren={onChildren}/>
-		      </div>))}
-		</div>
-	      </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>)
 }
@@ -385,14 +218,11 @@ const MaterialSidebar: FC = () => {
   const location = useLocation ()
   const navigate = useNavigate ()
   const qs = new URLSearchParams (location.search)
-  const materialFilter = parseMaterialFilter (qs.get ('material_filter'), 'any')
-  const selectedTagId = Number (qs.get ('tag_id') ?? 0) || null
+  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 [mobileAvailableInlineSizePx, setMobileAvailableInlineSizePx] =
-      useState<number | null> (null)
 
   const { data: rootTags = [], isLoading, isError } = useQuery ({
       queryKey: materialsKeys.tree ({ parentId: null, materialFilter }),
@@ -412,29 +242,6 @@ const MaterialSidebar: FC = () => {
     })
   }, [rootTags, materialFilter])
 
-  useEffect (() => {
-    const el = mobileRailRef.current
-    if (!(el))
-      return
-
-    const updateAvailableInlineSize = () => {
-      const nextInlineSize = Math.max (24, el.clientHeight)
-      setMobileAvailableInlineSizePx (prev => prev === nextInlineSize ? prev : nextInlineSize)
-    }
-
-    updateAvailableInlineSize ()
-
-    const resizeObserver = new ResizeObserver (() => {
-      updateAvailableInlineSize ()
-    })
-
-    resizeObserver.observe (el)
-
-    return () => {
-      resizeObserver.disconnect ()
-    }
-  }, [rootTags, materialFilter])
-
   const visibleRootTags = desktopTags.length > 0 ? desktopTags : rootTags
 
   const setChildren = (tagId: number, children: MaterialSidebarTag[]) => {
@@ -456,7 +263,6 @@ const MaterialSidebar: FC = () => {
 	      key={tag.id}
 	      tag={tag}
 	      materialFilter={materialFilter}
-	      selectedTagId={selectedTagId}
 	      openTags={openTags}
 	      setOpenTags={setOpenTags}
 	      onChildren={setChildren}/>)))
@@ -464,23 +270,17 @@ const MaterialSidebar: FC = () => {
   return (
       <>
 	<div className="border-b bg-stone-50 p-3 dark:border-stone-700 dark:bg-stone-950
-			dark:text-stone-100 md:hidden flex h-[25dvh] min-h-0 flex-col
-			overflow-hidden">
+			dark:text-stone-100 md:hidden">
 	  <MaterialFilterButtons
 	      materialFilter={materialFilter}
 	      onChange={handleFilterChange}/>
-	  <div
-	      ref={mobileRailRef}
-	      className="mt-3 min-h-0 flex-1 overflow-x-auto overflow-y-hidden">
-	    <div className="flex min-w-max flex-row-reverse items-start gap-3 pb-1 h-full
-			    min-h-0 max-h-full">
+	  <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}
-		      availableInlineSizePx={mobileAvailableInlineSizePx}
 		      materialFilter={materialFilter}
-		      selectedTagId={selectedTagId}
 		      openTags={openTags}
 		      setOpenTags={setOpenTags}
 		      onChildren={setChildren}/>))}

frontend/src/components/PostEditForm.test.tsx

@@ -66,27 +66,4 @@ describe ('PostEditForm', () => {
     expect (onSave).toHaveBeenCalledWith (expect.objectContaining ({ versionNo: 5 }))
     expect (toastApi.toast).toHaveBeenCalledWith ({ description: '更新しました．' })
   })
-
-  it ('preserves duration while the video tag is temporarily removed', () => {
-    const post = buildPost ({
-      videoMs: 180_500,
-      tags:    [
-        buildTag ({ id: 1, name: '動画', category: 'general' }),
-        buildTag ({ id: 2, name: 'general-tag', category: 'general' }),
-      ],
-    })
-
-    render (<PostEditForm post={post} onSave={vi.fn ()}/>)
-
-    expect (screen.getByRole ('spinbutton')).toHaveValue (180.5)
-
-    const tags = screen.getAllByRole ('textbox')[2]
-    fireEvent.change (tags, { target: { value: 'general-tag' } })
-    expect (screen.queryByRole ('spinbutton')).not.toBeInTheDocument ()
-
-    fireEvent.change (tags, {
-      target: { value: '動画 general-tag' },
-    })
-    expect (screen.getByRole ('spinbutton')).toHaveValue (180.5)
-  })
 })

frontend/src/components/PostEditForm.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState } from 'react'
+import { useEffect, useState } from 'react'
 
 import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
@@ -9,35 +9,29 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { isApiError } from '@/lib/api'
 import { updatePost } from '@/lib/posts'
-import { inputClass, msToTime } from '@/lib/utils'
+import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC, FormEvent } from 'react'
 
-import type { Post, TagWithSections } from '@/types'
+import type { Post, Tag } from '@/types'
 
 type PostFormField =
-    'parentPostIds' | 'tags' | 'videoMs' | 'originalCreatedAt'
-
-const videoMsToDurationValue = (videoMs: number | null): string =>
-    videoMs == null ? '' : String (videoMs / 1_000)
+    'parentPostIds' | 'tags' | 'originalCreatedAt'
 
 
-const tagsToStr = (tags: TagWithSections[]): string => {
-  const result: Omit<TagWithSections, 'children'>[] = []
+const tagsToStr = (tags: Tag[]): string => {
+  const result: Tag[] = []
 
-  const walk = (tag: TagWithSections) => {
+  const walk = (tag: Tag) => {
     const { children, ...rest } = tag
     result.push (rest)
-    children.forEach (walk)
+    children?.forEach (walk)
   }
 
   tags.filter (t => t.category !== 'nico').forEach (walk)
 
-  return [...(new Set (result.map (t =>
-      `${ t.name }${ t.sections
-		     .map (s => `[${ msToTime (s.beginMs) }-${ s.endMs == null ? '' : msToTime (s.endMs) }]`)
-		     .join ('') }`)))].join (' ')
+  return [...(new Set (result.map (t => t.name)))].join (' ')
 }
 
 
@@ -47,7 +41,6 @@ type Props = { post:    Post
 
 const PostEditForm: FC<Props> = ({ post, onSave }) => {
   const [disabled, setDisabled] = useState (false)
-  const [duration, setDuration] = useState<string> (videoMsToDurationValue (post.videoMs))
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<PostFormField> ()
   const [originalCreatedBefore, setOriginalCreatedBefore] =
@@ -59,10 +52,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   const [tags, setTags] = useState<string> ('')
   const [title, setTitle] = useState (post.title)
 
-  const videoFlg =
-      useMemo (() => tags.split (/\s+/).some (tag => tag.replace (/\[.*\]$/, '') === '動画'),
-	       [tags])
-
   const dialogue = useDialogue ()
 
   const update = async (...args: Parameters<typeof updatePost>) => {
@@ -74,7 +63,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
       onSave ({ ...post,
 		versionNo:              data.versionNo,
 		title:                  data.title,
-		videoMs:                data.videoMs,
 		tags:                   data.tags,
 		parentPosts:            data.parentPosts,
 		childPosts:             data.childPosts,
@@ -114,7 +102,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	{
 	  // TODO: 差分 UI
 	  await update ({ id: post.id, title, tags, parentPostIds,
-			  duration: videoFlg ? duration : null,
 			  originalCreatedFrom, originalCreatedBefore },
 			{ baseVersionNo: post.versionNo, merge: true })
 	  return
@@ -123,7 +110,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
       if (action === 'overwrite')
 	{
 	  await update ({ id: post.id, title, tags, parentPostIds,
-			  duration: videoFlg ? duration : null,
 			  originalCreatedFrom, originalCreatedBefore },
 			{ baseVersionNo: post.versionNo, force: true })
 	  return
@@ -138,7 +124,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
     try
     {
       await update ({ id: post.id, title, tags, parentPostIds,
-		      duration: videoFlg ? duration : null,
 		      originalCreatedFrom, originalCreatedBefore },
 		    { baseVersionNo: post.versionNo })
     }
@@ -149,8 +134,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   }
 
   useEffect (() => {
-    setTags (tagsToStr (post.tags))
-    setDuration (videoMsToDurationValue (post.videoMs))
+    setTags(tagsToStr (post.tags))
   }, [post])
 
   return (
@@ -165,7 +149,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 		  disabled={disabled}
 		  className={inputClass (invalid)}
 		  value={title ?? ''}
-		  onChange={e => setTitle (e.target.value)}/>)}
+		  onChange={ev => setTitle (ev.target.value)}/>)}
 	</FormField>
 
 	{/* 親投稿 */}
@@ -197,20 +181,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	    setOriginalCreatedBefore={setOriginalCreatedBefore}
 	    errors={fieldErrors.originalCreatedAt}/>
 
-	{/* 動画時間 */}
-	{videoFlg && (
-	    <FormField label="動画時間" messages={fieldErrors.videoMs}>
-	      {({ invalid }) => (
-		  <input
-		      type="number"
-		      min="0.001"
-		      step="0.001"
-		      disabled={disabled}
-		      className={inputClass (invalid)}
-		      value={duration}
-		      onChange={e => setDuration (e.target.value)}/>)}
-	    </FormField>)}
-
 	{/* 送信 */}
 	<Button type="submit" disabled={disabled}>
 	  更新
@@ -218,5 +188,4 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
       </form>)
 }
 
-
 export default PostEditForm

frontend/src/components/ResponsiveMarqueeText.tsx

@@ -1,250 +0,0 @@
-import { cn } from '@/lib/utils'
-import { useEffect, useRef, useState } from 'react'
-
-import type { FC } from 'react'
-
-type Props = {
-    text:      string
-    className?: string
-    truncateOnMobile?: boolean
-    title?:    string }
-
-const DESKTOP_MARQUEE_MEDIA =
-    '(min-width: 768px) and (hover: hover) and (pointer: fine) and (prefers-reduced-motion: no-preference)'
-const MARQUEE_START_DELAY_MS = 1600
-const MARQUEE_END_HOLD_MS = 2400
-const MARQUEE_SCROLL_PX_PER_SECOND = 43
-const MIN_MARQUEE_OVERFLOW_PX = 1
-
-
-const ResponsiveMarqueeText: FC<Props> = (
-    { text, className, truncateOnMobile = false, title },
-) => {
-  const outerRef = useRef<HTMLSpanElement | null> (null)
-  const staticRef = useRef<HTMLSpanElement | null> (null)
-  const animatedRef = useRef<HTMLSpanElement | null> (null)
-  const animationRef = useRef<Animation | null> (null)
-  const timeoutRef = useRef<number | null> (null)
-  const rafRef = useRef<number | null> (null)
-  const [overflowPx, setOverflowPx] = useState (0)
-  const [desktopMarqueeEnabled, setDesktopMarqueeEnabled] = useState (false)
-  const [active, setActive] = useState (false)
-  const [marqueeVisible, setMarqueeVisible] = useState (false)
-
-  useEffect (() => {
-    const outer = outerRef.current
-    const inner = staticRef.current
-
-    if (!(outer) || !(inner))
-      return
-
-    const measure = () => {
-      const nextOverflow = Math.max (0, Math.ceil (inner.scrollWidth - outer.clientWidth))
-      setOverflowPx (prev => Math.abs (prev - nextOverflow) <= 1 ? prev : nextOverflow)
-    }
-
-    measure ()
-
-    const resizeObserver =
-	typeof ResizeObserver === 'undefined'
-	? null
-	: new ResizeObserver (() => {
-	    measure ()
-	  })
-
-    resizeObserver?.observe (outer)
-    resizeObserver?.observe (inner)
-    addEventListener ('resize', measure)
-
-    return () => {
-      resizeObserver?.disconnect ()
-      removeEventListener ('resize', measure)
-    }
-  }, [text])
-
-  useEffect (() => {
-    if (typeof window === 'undefined' || typeof window.matchMedia !== 'function')
-      return
-
-    const media = window.matchMedia (DESKTOP_MARQUEE_MEDIA)
-    const update = () => {
-      setDesktopMarqueeEnabled (media.matches)
-    }
-
-    update ()
-    media.addEventListener ('change', update)
-
-    return () => {
-      media.removeEventListener ('change', update)
-    }
-  }, [])
-
-  useEffect (() => {
-    const clearScheduled = () => {
-      if (timeoutRef.current != null)
-        {
-          clearTimeout (timeoutRef.current)
-          timeoutRef.current = null
-        }
-      if (rafRef.current != null)
-        {
-          cancelAnimationFrame (rafRef.current)
-          rafRef.current = null
-        }
-      animationRef.current?.cancel ()
-      animationRef.current = null
-    }
-
-    const animated = animatedRef.current
-    const canMarquee = (
-        active
-        && desktopMarqueeEnabled
-        && overflowPx >= MIN_MARQUEE_OVERFLOW_PX
-        && animated != null)
-
-    const resetAnimated = () => {
-      const node = animatedRef.current
-
-      animationRef.current?.cancel ()
-      animationRef.current = null
-      node?.getAnimations?.().forEach (animation => {
-        animation.cancel ()
-      })
-
-      if (!(node))
-        return
-
-      node.style.transition = 'none'
-      node.style.transform = 'translateX(0)'
-    }
-
-    if (!canMarquee)
-      {
-        clearScheduled ()
-        resetAnimated ()
-        setMarqueeVisible (false)
-        return
-      }
-
-    let cancelled = false
-
-    const sleep = (ms: number) =>
-	new Promise<void> (resolve => {
-	  timeoutRef.current = window.setTimeout (() => {
-	    timeoutRef.current = null
-	    resolve ()
-	  }, ms)
-	})
-
-    const runLoop = async () => {
-      while (!cancelled)
-        {
-          resetAnimated ()
-          setMarqueeVisible (true)
-
-          await sleep (MARQUEE_START_DELAY_MS)
-          if (cancelled || !(animatedRef.current))
-            break
-
-          const moveDurationMs =
-	      overflowPx / MARQUEE_SCROLL_PX_PER_SECOND * 1000
-          const node = animatedRef.current
-
-          if (typeof node.animate === 'function')
-            {
-              const animation = node.animate (
-		  [
-		    { transform: 'translateX(0)' },
-		    { transform: `translateX(-${ overflowPx }px)` },
-		  ],
-		  { duration: moveDurationMs, easing: 'linear', fill: 'forwards' })
-              animationRef.current = animation
-              try
-              {
-                await animation.finished
-              }
-              catch
-              {
-                break
-              }
-
-              node.style.transform = `translateX(-${ overflowPx }px)`
-              animation.cancel ()
-              if (animationRef.current === animation)
-                animationRef.current = null
-            }
-          else
-            {
-              node.style.transition = `transform ${ moveDurationMs }ms linear`
-              await new Promise<void> (resolve => {
-                rafRef.current = requestAnimationFrame (() => {
-                  rafRef.current = null
-                  node.style.transform = `translateX(-${ overflowPx }px)`
-                  resolve ()
-                })
-              })
-              await sleep (moveDurationMs)
-              node.style.transition = 'none'
-              node.style.transform = `translateX(-${ overflowPx }px)`
-            }
-
-          if (cancelled)
-            break
-
-          await sleep (MARQUEE_END_HOLD_MS)
-          if (cancelled)
-            break
-
-          resetAnimated ()
-        }
-    }
-
-    void runLoop ()
-
-    return () => {
-      cancelled = true
-      clearScheduled ()
-      resetAnimated ()
-      setMarqueeVisible (false)
-    }
-  }, [active, desktopMarqueeEnabled, overflowPx, text])
-
-  return (
-      <span
-	  ref={outerRef}
-	  title={title ?? text}
-	  onMouseEnter={() => setActive (true)}
-	  onMouseLeave={() => setActive (false)}
-	  onFocus={() => setActive (true)}
-	  onBlur={() => setActive (false)}
-	  className={cn (
-	      'tag-marquee inline-block max-w-full min-w-0 align-bottom',
-	      (truncateOnMobile
-	       ? 'overflow-hidden text-ellipsis whitespace-nowrap'
-	       : 'whitespace-normal [overflow-wrap:anywhere]'),
-	      'md:overflow-hidden md:whitespace-nowrap',
-	      className)}>
-	<span
-	    ref={staticRef}
-	    className={cn (
-		'tag-marquee__static block max-w-full',
-		(truncateOnMobile
-		 ? 'overflow-hidden text-ellipsis whitespace-nowrap'
-		 : 'whitespace-normal [overflow-wrap:anywhere]'),
-		'md:overflow-hidden md:text-ellipsis md:whitespace-nowrap',
-		marqueeVisible && 'md:opacity-0')}>
-	  {text}
-	</span>
-	{overflowPx >= MIN_MARQUEE_OVERFLOW_PX && (
-	    <span
-		ref={animatedRef}
-		aria-hidden="true"
-		className={cn (
-		    'tag-marquee__animated hidden md:block',
-		    marqueeVisible ? 'md:opacity-100' : 'md:opacity-0')}>
-	      {text}
-	    </span>)}
-      </span>)
-}
-
-export default ResponsiveMarqueeText

frontend/src/components/TagDetailSidebar.tsx

@@ -26,13 +26,13 @@ import { dateString, originalCreatedAtString } from '@/lib/utils'
 import type { DragEndEvent } from '@dnd-kit/core'
 import type { FC, MutableRefObject, ReactNode } from 'react'
 
-import type { Category, Post, TagWithSections } from '@/types'
+import type { Category, Post, Tag } from '@/types'
 
-type TagByCategory = { [key in Category]: TagWithSections[] }
+type TagByCategory = { [key in Category]: Tag[] }
 
 
 const renderTagTree = (
-    tag:              TagWithSections,
+    tag:              Tag,
     nestLevel:        number,
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
@@ -62,9 +62,8 @@ const renderTagTree = (
 
 
 const isDescendant = (
-    root:     TagWithSections,
-    targetId: number,
-): boolean => {
+    root:     Tag,
+    targetId: number): boolean => {
   if (!(root.children))
     return false
 
@@ -82,9 +81,8 @@ const isDescendant = (
 
 const findTag = (
     byCat:  TagByCategory,
-    id:     number,
-): TagWithSections | undefined => {
-  const walk = (nodes: TagWithSections[]): TagWithSections | undefined => {
+    id:     number): Tag | undefined => {
+  const walk = (nodes: Tag[]): Tag | undefined => {
     for (const t of nodes)
       {
 	if (t.id === id)
@@ -165,7 +163,7 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
       }
 
     for (const cat of Object.keys (tagsTmp) as (keyof typeof tagsTmp)[])
-      tagsTmp[cat].sort ((tagA: TagWithSections, tagB: TagWithSections) => tagA.name < tagB.name ? -1 : 1)
+      tagsTmp[cat].sort ((tagA: Tag, tagB: Tag) => tagA.name < tagB.name ? -1 : 1)
 
     return tagsTmp
   }, [post])
@@ -375,4 +373,4 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
       </SidebarComponent>)
 }
 
-export default TagDetailSidebar
+export default TagDetailSidebar

frontend/src/components/TagLink.tsx

@@ -1,5 +1,4 @@
 import PrefetchLink from '@/components/PrefetchLink'
-import ResponsiveMarqueeText from '@/components/ResponsiveMarqueeText'
 import { LIGHT_COLOUR_SHADE, DARK_COLOUR_SHADE, TAG_COLOUR } from '@/consts'
 import { cn } from '@/lib/utils'
 
@@ -10,7 +9,6 @@ import type { Tag } from '@/types'
 type CommonProps = { 
     tag:        Tag
     nestLevel?: number
-    truncateOnMobile?: boolean
     withWiki?:  boolean
     withCount?: boolean }
 
@@ -30,14 +28,11 @@ type Props =
 
 
 const TagLink: FC<Props> = ({ tag,
-			      nestLevel = 0,
-			      linkFlg   = true,
-			      truncateOnMobile = false,
-			      withWiki  = true,
-			      withCount = true,
-			      className,
-			      title,
-			      ...props }) => {
+		   nestLevel = 0,
+		   linkFlg   = true,
+		   withWiki  = true,
+		   withCount = true,
+		   ...props }) => {
   const spanClass = cn (
       `text-${ TAG_COLOUR[tag.category] }-${ LIGHT_COLOUR_SHADE }`,
       `dark:text-${ TAG_COLOUR[tag.category] }-${ DARK_COLOUR_SHADE }`)
@@ -45,18 +40,11 @@ const TagLink: FC<Props> = ({ tag,
       spanClass,
       `hover:text-${ TAG_COLOUR[tag.category] }-${ LIGHT_COLOUR_SHADE - 200 }`,
       `dark:hover:text-${ TAG_COLOUR[tag.category] }-${ DARK_COLOUR_SHADE - 200 }`)
-  const textClass = 'group min-w-0 max-w-full overflow-hidden align-bottom'
-  const rootClass =
-      'inline-flex min-w-0 max-w-full flex-nowrap items-stretch align-baseline gap-x-1 md:items-baseline'
-  const markerWrapClass = 'shrink-0 self-start md:self-auto'
-  const countClass = 'shrink-0 self-end md:self-auto'
-  const textTitle = title
-      ?? (tag.matchedAlias == null ? tag.name : `${ tag.matchedAlias } → ${ tag.name }`)
 
   return (
-      <span className={rootClass}>
+      <>
 	{(linkFlg && withWiki) && (
-	    <span className={markerWrapClass}>
+	    <span className="mr-1">
 	      {(tag.materialId != null || tag.hasWiki || tag.hasDeerjikists)
 	       ? (
 		  tag.materialId == null && !(tag.hasDeerjikists)
@@ -111,48 +99,33 @@ const TagLink: FC<Props> = ({ tag,
 	    </span>)}
 	{nestLevel > 0 && (
 	    <span
-		className="ml-1 mr-1 shrink-0"
+		className="ml-1 mr-1"
 		style={{ paddingLeft: `${ (nestLevel - 1) }rem` }}>
 	      ↳
 	    </span>)}
 	{tag.matchedAlias != null && (
 	    <>
-	      <span
-		  title={textTitle}
-		  className={cn (spanClass, textClass, className)}
-		  {...props}>
-		<ResponsiveMarqueeText
-		    text={tag.matchedAlias}
-		    title={textTitle}
-		    truncateOnMobile={truncateOnMobile}/>
+	      <span className={spanClass} {...props}>
+		{tag.matchedAlias}
 	      </span>
-	      <span className="shrink-0"> → </span>
+	      <> → </>
 	    </>)}
 	{linkFlg
 	 ? (
 	    <PrefetchLink
 		to={`/posts?${ (new URLSearchParams ({ tags: tag.name })).toString () }`}
-		title={textTitle}
-		className={cn (linkClass, textClass, className)}
+		className={linkClass}
 		{...props}>
-	      <ResponsiveMarqueeText
-		  text={tag.name}
-		  title={textTitle}
-		  truncateOnMobile={truncateOnMobile}/>
+	      {tag.name}
 	    </PrefetchLink>)
 	 : (
-	    <span
-		  title={textTitle}
-		  className={cn (spanClass, textClass, className)}
+	    <span className={spanClass}
 		  {...props}>
-	      <ResponsiveMarqueeText
-		  text={tag.name}
-		  title={textTitle}
-		  truncateOnMobile={truncateOnMobile}/>
+	      {tag.name}
 	    </span>)}
 	{withCount && (
-	    <span className={countClass}>{tag.postCount}</span>)}
-      </span>)
+	    <span className="ml-1">{tag.postCount}</span>)}
+      </>)
 }
 
 export default TagLink

frontend/src/components/TagSearchBox.tsx

@@ -20,14 +20,12 @@ const TagSearchBox: FC<Props> = ({ suggestions, activeIndex, onSelect }) => {
 		     rounded shadow">
 	{suggestions.map ((tag, i) => (
 	    <li key={tag.id}
-		className={cn ('min-w-0 overflow-hidden px-3 py-2 cursor-pointer hover:bg-gray-300 dark:hover:bg-gray-700',
+		className={cn ('px-3 py-2 cursor-pointer hover:bg-gray-300 dark:hover:bg-gray-700', 
 			       i === activeIndex && 'bg-gray-300 dark:bg-gray-700')}
 		onMouseDown={() => onSelect (tag)}>
-	      <div className="flex min-w-0 max-w-full items-baseline overflow-hidden">
-		<TagLink tag={tag} linkFlg={false} withWiki={false}/>
-	      </div>
+	      <TagLink tag={tag} linkFlg={false} withWiki={false}/>
 	    </li>))}
       </ul>)
 }
 
-export default TagSearchBox
+export default TagSearchBox

frontend/src/components/TagSidebar.tsx

@@ -64,9 +64,8 @@ const TagSidebar: FC<Props> = ({ posts, onClick }) => {
 	<ul>
 	  {CATEGORIES.flatMap (cat => cat in tags ? (
 	      tags[cat].map (tag => (
-		  <li key={tag.id} className="mb-1 min-w-0 max-w-full overflow-hidden">
+		  <li key={tag.id} className="mb-1">
 		    <motion.div
-			className="flex min-w-0 max-w-full items-baseline overflow-hidden"
 			transition={{ layout: { duration: .2, ease: 'easeOut' } }}
 			layoutId={`tag-${ tag.id }`}>
 		      <TagLink tag={tag} onClick={onClick}/>
@@ -129,4 +128,4 @@ const TagSidebar: FC<Props> = ({ posts, onClick }) => {
       </SidebarComponent>)
 }
 
-export default TagSidebar
+export default TagSidebar

frontend/src/components/TopNav.tsx

@@ -7,36 +7,30 @@ import Separator from '@/components/MenuSeparator'
 import PrefetchLink from '@/components/PrefetchLink'
 import TopNavUser from '@/components/TopNavUser'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
-import { materialsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
+import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchTag, fetchTagByName } from '@/lib/tags'
-import { fetchMaterial } from '@/lib/materials'
 import { cn } from '@/lib/utils'
 import { fetchWikiPage } from '@/lib/wiki'
 
 import type { FC, MouseEvent } from 'react'
 
-import type { Material, Menu, MenuVisibleItem, Tag, User } from '@/types'
+import type { Menu, MenuVisibleItem, Tag, User } from '@/types'
 
 type Props = { user: User | null }
 
 
-export const menuOutline = (
-    { tag, material, wikiId, user, pathName }: {
-	tag?: Tag | null
-	material?: Material | null
-	wikiId: number | null
-	user: User | null,
-	pathName: string },
-): Menu => {
-  const postCount = tag?.postCount ?? material?.tag?.postCount ?? 0
+export const menuOutline = ({ tag, wikiId, user, pathName }: { 
+    tag?: Tag | null
+    wikiId: number | null
+    user: User | null,
+    pathName: string }): Menu => {
+  const postCount = tag?.postCount ?? 0
 
   const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^/]+/.test (pathName) && wikiId)
   const wikiTitle = pathName.split ('/')[2] ?? ''
 
   const tagFlg = /^\/tags\/\d+/.test (pathName)
 
-  const materialFlg = /^\/materials\/\d+/.test (pathName)
-
   return [
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },
@@ -55,18 +49,12 @@ export const menuOutline = (
 	    visible: tagFlg },
 	  { name: '履歴', to: `/tags/changes?id=${ tag?.id }`,
 	    visible: tagFlg && tag?.category !== 'nico' }] },
-      { name: '素材', to: '/materials', visible: true, subMenu: [
+      { name: '素材', to: '/materials', visible: false, subMenu: [
 	  { name: '一覧', to: '/materials' },
+	  { name: '検索', to: '/materials/search', visible: false }, 
 	  { name: '追加', to: '/materials/new' },
-	  { name: '抑止', to: '/materials/suppressions' },
-	  { name: '全体履歴', to: '/materials/changes' },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材管理' },
-	  { component: <Separator/>, visible: materialFlg },
-	  { name: `広場 (${ postCount || 0 })`,
-	    to: `/posts?tags=${ encodeURIComponent (material?.tag?.name ?? '') }`,
-	    visible: materialFlg && Boolean (material?.tag) },
-	  { name: '履歴', to: `/materials/changes?material_id=${ material?.id }`,
-	    visible: materialFlg }] },
+	  { name: '全体履歴', to: '/materials/changes', visible: false },
+	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材集' }] },
       { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
 	  { name: '検索', to: '/wiki' },
 	  { name: '新規', to: '/wiki/new' },
@@ -131,23 +119,15 @@ const TopNav: FC<Props> = ({ user }) => {
       queryFn: () => fetchWikiPage (wikiIdStr, { }) })
 
   const tagFlg = /^\/tags\/\d+/.test (location.pathname)
-  const materialFlg = /^\/materials\/\d+/.test (location.pathname)
-  const effectiveTitle = (((tagFlg || materialFlg)
-			   ? location.pathname.split ('/')[2]
-			   : wikiPage?.title)
-			  ?? '')
+  const effectiveTitle = (tagFlg ? location.pathname.split ('/')[2] : wikiPage?.title) ?? ''
 
   const { data: tag } = useQuery ({
       enabled: Boolean (effectiveTitle),
       queryKey: tagsKeys.show (effectiveTitle),
       queryFn: () => (tagFlg ? fetchTag : fetchTagByName) (effectiveTitle) })
 
-  const { data: material } = useQuery ({
-      enabled: Boolean (effectiveTitle),
-      queryKey: materialsKeys.show (effectiveTitle),
-      queryFn: () => fetchMaterial (effectiveTitle) })
 
-  const menu = menuOutline ({ tag, material, wikiId, user, pathName: location.pathname })
+  const menu = menuOutline ({ tag, wikiId, user, pathName: location.pathname })
   const visibleMenu = menu.filter ((item): item is MenuVisibleItem => item.visible ?? true)
   const moreMenu = menu.filter (item =>
       !(item.visible ?? true)

frontend/src/components/common/PageTitle.tsx

@@ -1,14 +1,12 @@
 import React from 'react'
 
-import { cn } from '@/lib/utils'
-
 import type { FC } from 'react'
 
-type Props = { children: React.ReactNode; className?: string }
+type Props = { children: React.ReactNode }
 
 
-const PageTitle: FC<Props> = ({ children, className, ...rest }) => (
-    <h1 className={cn ('text-2xl font-bold mb-2', className)} {...rest}>
+const PageTitle: FC<Props> = ({ children }) => (
+    <h1 className="text-2xl font-bold mb-2">
       {children}
     </h1>)
 

frontend/src/components/ui/input.tsx

@@ -1,19 +1,19 @@
-import * as React from 'react'
-
-import { cn } from '@/lib/utils'
-
-const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<'input'>>(
-  ({ className, type, ...props }, ref) => {
-    return (
-      <input
-	type={type}
-	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',
-	  className)}
-	ref={ref}
-	{...props}
-      />)
-  })
-Input.displayName = 'Input'
-
-export { Input }
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+	type={type}
+	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",
+	  className
)}
+	ref={ref}
+	{...props}
+      />
)
+  }
)
+Input.displayName = "Input"
+
+export { Input }

frontend/src/components/ui/switch.tsx

@@ -1,26 +1,26 @@
-'use client'
-
-import * as React from 'react'
-import * as SwitchPrimitives from '@radix-ui/react-switch'
-
-import { cn } from '@/lib/utils'
-
-const Switch = React.forwardRef<
-  React.ElementRef<typeof SwitchPrimitives.Root>,
-  React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
->(({ className, ...props }, ref) => (
-  <SwitchPrimitives.Root
-    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',
-      className)}
-    {...props}
-    ref={ref}
-  >
-    <SwitchPrimitives.Thumb
-      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')}
-    />
-  </SwitchPrimitives.Root>))
-Switch.displayName = SwitchPrimitives.Root.displayName
-
-export { Switch }
+"use client"
+
+import * as React from "react"
+import * as SwitchPrimitives from "@radix-ui/react-switch"
+
+import { cn } from "@/lib/utils"
+
+const Switch = React.forwardRef<
+  React.ElementRef<typeof SwitchPrimitives.Root>,
+  React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
+>(({ className, ...props }, ref) => (
+  <SwitchPrimitives.Root
+    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",
+      className
)}
+    {...props}
+    ref={ref}
+  >
+    <SwitchPrimitives.Thumb
+      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"
)}
+    />
+  </SwitchPrimitives.Root>
))
+Switch.displayName = SwitchPrimitives.Root.displayName
+
+export { Switch }

frontend/src/index.css

@@ -132,20 +132,3 @@ body
   0%, 100% { color: #f87171; }
   50% { color: #60a5fa; }
 }
-
-.tag-marquee
-{
-  position: relative;
-}
-
-.tag-marquee__animated
-{
-  position: absolute;
-  inset: 0 auto 0 0;
-  min-width: 100%;
-  width: max-content;
-  opacity: 0;
-  pointer-events: none;
-  white-space: nowrap;
-  will-change: transform;
-}

frontend/src/lib/materials.ts

@@ -1,31 +1,45 @@
-import { apiGet, isApiError, apiPost, apiPut } from '@/lib/api'
+import {
+    apiGet,
+    isApiError,
+    apiPost,
+    apiPut,
+} from '@/lib/api'
 
-import type { Material,
-	      MaterialIndexResponse,
-	      MaterialVersion,
-	      FetchMaterialsParams,
-	      MaterialFilter,
-	      MaterialSyncSuppression,
-	      MaterialSidebarTag,
-	      MaterialTagTree } from '@/types'
+import type {
+    Material,
+    MaterialVersion,
+    FetchMaterialsParams,
+    MaterialFilter,
+    MaterialSyncSuppression,
+    MaterialSidebarTag,
+    MaterialTagTree,
+} from '@/types'
 
 export type FetchMaterialTreeParams = {
     parentId?:       number | null
-    materialFilter:  MaterialFilter }
+    materialFilter:  MaterialFilter
+}
 
-export type MaterialSyncSuppressionResponse = { suppressions: MaterialSyncSuppression[] }
+export type MaterialIndexResponse = {
+    materials: Material[]
+    count:     number
+}
+
+export type MaterialSyncSuppressionResponse = {
+    suppressions: MaterialSyncSuppression[]
+}
 
 export type MaterialChangesResponse = {
     versions: MaterialVersion[]
-    count:    number }
+    count:    number
+}
 
 const MATERIAL_FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
 
 
 export const parseMaterialFilter = (
     value: unknown,
-    fallback: MaterialFilter = 'present',
-): MaterialFilter =>
+    fallback: MaterialFilter = 'present'): MaterialFilter =>
     typeof value === 'string' && MATERIAL_FILTERS.includes (value as MaterialFilter)
     ? value as MaterialFilter
     : fallback
@@ -34,16 +48,11 @@ export const parseMaterialFilter = (
 export const fetchMaterials = async (
     { q, tagState, mediaKind, createdFrom, createdTo,
       updatedFrom, updatedTo, sort, direction, page,
-      tagId, includeDescendants, groupBy,
-      limit }: FetchMaterialsParams,
-): Promise<MaterialIndexResponse> =>
+      limit }: FetchMaterialsParams): Promise<MaterialIndexResponse> =>
     await apiGet ('/materials', { params: {
 	...(q && { q }),
 	tag_state:   tagState,
 	media_kind:  mediaKind,
-	...(tagId != null && { tag_id: tagId }),
-	...(includeDescendants && { include_descendants: '1' }),
-	...(groupBy !== 'none' && { group_by: groupBy }),
 	...(createdFrom && { created_from: createdFrom }),
 	...(createdTo && { created_to: createdTo }),
 	...(updatedFrom && { updated_from: updatedFrom }),

frontend/src/lib/posts.test.ts

@@ -70,7 +70,6 @@ describe ('posts API functions', () => {
           id:                    5,
           title:                 'new title',
           tags:                  'tag',
-          duration:              null,
           parentPostIds:         '1 2',
           originalCreatedFrom:   null,
           originalCreatedBefore: '2026-01-02T00:00:00Z',
@@ -83,7 +82,6 @@ describe ('posts API functions', () => {
         {
           title:                   'new title',
           tags:                    'tag',
-          duration:                null,
           parent_post_ids:         '1 2',
           original_created_from:   null,
           original_created_before: '2026-01-02T00:00:00Z',

frontend/src/lib/posts.ts

@@ -44,7 +44,6 @@ export const updatePost = async (
     post: { id:                     number
 	    title:                  string | null
 	    tags:                   string
-	    duration:               string | null
 	    parentPostIds:          string
 	    originalCreatedFrom:    string | null
 	    originalCreatedBefore:  string | null },
@@ -56,7 +55,6 @@ export const updatePost = async (
 	`/posts/${ post.id }`,
 	{ title: post.title,
 	  tags: post.tags,
-	  duration: post.duration,
 	  parent_post_ids: post.parentPostIds,
 	  original_created_from: post.originalCreatedFrom,
 	  original_created_before: post.originalCreatedBefore },

frontend/src/lib/utils.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest'
 
-import { cn, msToTime, originalCreatedAtString, toDate } from '@/lib/utils'
+import { cn, originalCreatedAtString, toDate } from '@/lib/utils'
 
 describe ('utils', () => {
   it ('converts strings to dates and leaves date instances intact', () => {
@@ -26,14 +26,3 @@ describe ('utils', () => {
     ).toContain ('時刻不詳')
   })
 })
-
-describe ('msToTime', () => {
-  it ('keeps milliseconds when present', () => {
-    expect (msToTime (60_500)).toBe ('1:00.500')
-    expect (msToTime (60_001)).toBe ('1:00.001')
-  })
-
-  it ('omits milliseconds when they are zero', () => {
-    expect (msToTime (60_000)).toBe ('1:00')
-  })
-})

frontend/src/lib/utils.ts

@@ -71,22 +71,6 @@ export const originalCreatedAtString = (
 }
 
 
-export const msToTime = (ms: number): string => {
-  const totalS = Math.trunc (ms / 1_000)
-  const s = String (totalS % 60)
-  const min = String (Math.trunc (totalS / 60) % 60)
-  const h = Math.trunc (totalS / 3_600)
-  const remainderMs = ms % 1_000
-
-  const base =
-      (h > 0
-       ? `${ h }:${ min.padStart (2, '0') }:${ s.padStart (2, '0') }`
-       : `${ min }:${ s.padStart (2, '0') }`)
-
-  return remainderMs > 0 ? `${ base }.${ remainderMs.toString ().padStart (3, '0') }` : base
-}
-
-
 export const inputClass = (invalid?: boolean, className?: string): string =>
     cn ('w-full rounded border p-2',
 	(invalid

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

@@ -7,9 +7,9 @@ import { buildMaterial, buildTag } from '@/test/factories'
 import { renderWithProviders } from '@/test/render'
 
 const api = vi.hoisted (() => ({
-  apiGet:     vi.fn (),
-  apiPut:     vi.fn (),
-  isApiError: vi.fn (),
+  apiGet: vi.fn (),
+  apiPatch: vi.fn (),
+  apiPut: vi.fn (),
 }))
 
 const wikiApi = vi.hoisted (() => ({
@@ -35,11 +35,7 @@ const renderPage = () =>
 describe ('MaterialDetailPage', () => {
   beforeEach (() => {
     vi.clearAllMocks ()
-    api.apiGet.mockImplementation (async (path: string) =>
-      path === '/tags/autocomplete'
-      ? []
-      : buildMaterial ({ id: 8 }))
-    api.isApiError.mockReturnValue (false)
+    api.apiGet.mockResolvedValue ([])
     wikiApi.fetchWikiPages.mockResolvedValue ([])
     vi.stubGlobal ('fetch', vi.fn (async () => ({
       blob: async () => new Blob (['image'], { type: 'image/png' }),
@@ -90,22 +86,4 @@ describe ('MaterialDetailPage', () => {
     expect (formData.get ('export_paths[legacy_drive]')).toBe ('素材/new.png')
     expect (toastApi.toast).toHaveBeenCalledWith ({ title: '更新成功!' })
   })
-
-  it ('shows not found when material API returns 404', async () => {
-    api.isApiError.mockReturnValue (true)
-    api.apiGet.mockRejectedValueOnce ({ response: { status: 404 } })
-
-    renderPage ()
-
-    expect (await screen.findByText ('素材が見つかりませんでした．')).toBeInTheDocument ()
-  })
-
-  it ('shows an error for non-404 material API failures', async () => {
-    api.isApiError.mockReturnValue (false)
-    api.apiGet.mockRejectedValueOnce (new Error ('network error'))
-
-    renderPage ()
-
-    expect (await screen.findByText ('素材の取得に失敗しました．')).toBeInTheDocument ()
-  })
 })

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -8,6 +8,7 @@ import WikiBody from '@/components/WikiBody'
 import FieldError from '@/components/common/FieldError'
 import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
+import PrefetchLink from '@/components/PrefetchLink'
 import TabGroup, { Tab } from '@/components/common/TabGroup'
 import TagInput from '@/components/common/TagInput'
 import MainArea from '@/components/layout/MainArea'
@@ -118,6 +119,12 @@ const MaterialDetailPage: FC = () => {
 		 : materialTitle}
 	      </PageTitle>
 
+	      <PrefetchLink
+		  to={`/materials/changes?material_id=${ material.id }`}
+		  className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+		この素材の履歴
+	      </PrefetchLink>
+
 	      {(material.file && material.contentType) && (
 		  (/image\/.*/.test (material.contentType) && (
 		      <img src={material.file} alt={material.tag?.name || undefined}/>))
@@ -127,12 +134,17 @@ const MaterialDetailPage: FC = () => {
 		      <audio src={material.file} controls/>)))}
 
 	      <TabGroup>
-		{material.tag && (
-		    <Tab name="Wiki">
+		<Tab name="Wiki">
+		  {material.tag
+		   ? (
 		      <WikiBody
 			  title={material.tag.name}
-			  body={material.wikiPageBody ?? undefined}/>
-		    </Tab>)}
+			  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 space-y-4 pt-2">

frontend/src/pages/materials/MaterialHistoryPage.tsx

@@ -80,7 +80,14 @@ const MaterialHistoryPage: FC = () => {
 	</Helmet>
 
 	<div className="space-y-5">
-	  <PageTitle>素材履歴</PageTitle>
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <PageTitle>素材履歴</PageTitle>
+	    <PrefetchLink
+		to="/materials"
+		className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+	      素材一覧へ戻る
+	    </PrefetchLink>
+	  </div>
 
 	  <form
 	      onSubmit={handleSearch}
@@ -105,6 +112,20 @@ const MaterialHistoryPage: FC = () => {
 			onChange={e => setTagInput (e.target.value)}
 			className={inputClass (invalid)}/>)}
 	      </FormField>
+
+	      <FormField label="イベント">
+		{({ invalid }) => (
+		    <select
+			value={eventTypeInput}
+			onChange={e => setEventTypeInput (e.target.value)}
+			className={inputClass (invalid)}>
+		      <option value="">すべて</option>
+		      <option value="create">create</option>
+		      <option value="update">update</option>
+		      <option value="discard">discard</option>
+		      <option value="restore">restore</option>
+		    </select>)}
+	      </FormField>
 	    </div>
 
 	    <button
@@ -129,6 +150,7 @@ const MaterialHistoryPage: FC = () => {
 		  <table className="w-full min-w-[1200px] table-fixed border-collapse">
 		    <colgroup>
 		      <col className="w-48"/>
+		      <col className="w-32"/>
 		      <col className="w-28"/>
 		      <col className="w-24"/>
 		      <col className="w-64"/>
@@ -141,6 +163,7 @@ const MaterialHistoryPage: FC = () => {
 		    <thead className="border-b-2 border-black dark:border-white">
 		      <tr>
 			<th className="p-2 text-left">日時</th>
+			<th className="p-2 text-left">event_type</th>
 			<th className="p-2 text-left">素材 ID</th>
 			<th className="p-2 text-left">版</th>
 			<th className="p-2 text-left">タグ名</th>
@@ -157,6 +180,7 @@ const MaterialHistoryPage: FC = () => {
 			      key={version.id}
 			      className="even:bg-gray-100 dark:even:bg-gray-700">
 			    <td className="p-2">{dateString (version.createdAt)}</td>
+			    <td className="p-2">{version.eventType}</td>
 			    <td className="p-2">
 			      <PrefetchLink to={`/materials/${ version.materialId }`}>
 				#{version.materialId}

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

@@ -1,5 +1,5 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { screen, waitFor } from '@testing-library/react'
+import { describe, expect, it, vi } from 'vitest'
 
 import MaterialListPage from '@/pages/materials/MaterialListPage'
 import { buildMaterial, buildTag } from '@/test/factories'
@@ -12,169 +12,51 @@ const api = vi.hoisted (() => ({
 vi.mock ('@/lib/api', () => api)
 
 describe ('MaterialListPage', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    api.apiGet.mockResolvedValue ({ materials: [], count: 0 })
+  it ('shows the empty selection guide without a tag query', () => {
+    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
+
+    expect (screen.getByText ('左のリストから照会したいタグを選択してください。')).toBeInTheDocument ()
+    expect (screen.getByRole ('link', { name: '素材を新規追加する' })).toHaveAttribute (
+        'href',
+        '/materials/new',
+    )
   })
 
-  it ('loads the material index on the initial page', async () => {
-    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
+  it ('loads materials for a tag query', async () => {
+    const tag = {
+      ...buildTag ({
+        id:       4,
+        name:     '素材タグ',
+        category: 'material',
+      }),
+      material: buildMaterial ({ id: 8, contentType: 'image/png', file: 'image.png' }),
+      children: [],
+    }
+    api.apiGet.mockResolvedValueOnce (tag)
+
+    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag=%E7%B4%A0%E6%9D%90' })
 
     await waitFor (() => {
       expect (api.apiGet).toHaveBeenCalledWith (
-          '/materials',
-          { params: {
-              tag_state:  'all',
-              media_kind: 'all',
-              sort:       'created_at',
-              direction:  'desc',
-              page:       1,
-              limit:      20,
-          } },
+          '/tags/name/%E7%B4%A0%E6%9D%90/materials',
       )
     })
-    expect (await screen.findByText ('素材はありません。')).toBeInTheDocument ()
+    expect (await screen.findByRole ('link', { name: '素材タグ' })).toBeInTheDocument ()
+    expect (screen.getByRole ('link', { name: '' })).toHaveAttribute ('href', '/materials/8')
   })
 
-  it ('shows materials in the default card view', async () => {
+  it ('offers adding a missing non-meme material', async () => {
     api.apiGet.mockResolvedValueOnce ({
-      materials: [
-        buildMaterial ({
-          id:          8,
-          tag:         buildTag ({ name: '素材タグ', category: 'material' }),
-          thumbnail:   'thumb.png',
-          mediaKind:   'image',
-          contentType: 'image/png',
-        }),
-      ],
-      count: 1,
+      ...buildTag ({ name: '未登録', category: 'material' }),
+      material: null,
+      children: [],
     })
 
-    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
+    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag=x' })
 
-    expect ((await screen.findByText ('素材タグ')).closest ('a'))
-      .toHaveAttribute ('href', '/materials/8')
-    expect (screen.getByText (/画像 \/ 令和8年1月2日/)).toBeInTheDocument ()
-  })
-
-  it ('submits list filters as material index params', async () => {
-    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
-
-    fireEvent.change (screen.getByPlaceholderText ('タグ名 / URL / ファイル名'), {
-      target: { value: '虹夏' },
-    })
-    const selects = screen.getAllByRole ('combobox')
-    fireEvent.change (selects[0], {
-      target: { value: 'untagged' },
-    })
-    fireEvent.change (selects[1], {
-      target: { value: 'image' },
-    })
-    fireEvent.click (screen.getByRole ('button', { name: '検索' }))
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith (
-          '/materials',
-          expect.objectContaining ({ params: expect.objectContaining ({
-            q:          '虹夏',
-            tag_state:  'untagged',
-            media_kind: 'image',
-          }) }),
-      )
-    })
-  })
-
-  it ('keeps a route back to the material search top for untagged materials', async () => {
-    renderWithProviders (
-        <MaterialListPage/>,
-        { route: '/materials?tag_state=untagged&material_filter=any' },
-    )
-
-    expect (await screen.findByRole (
-        'link',
-        { name: '素材検索トップへ戻る' },
-    )).toHaveAttribute ('href', '/materials?material_filter=any')
-  })
-
-  it ('uses list view for detailed material rows', async () => {
-    api.apiGet.mockResolvedValueOnce ({
-      materials: [
-        buildMaterial ({
-          id:           9,
-          tag:          buildTag ({ name: '詳細素材', category: 'material' }),
-          mediaKind:    'file_other',
-          fileByteSize: 2048,
-        }),
-      ],
-      count: 1,
-    })
-
-    renderWithProviders (<MaterialListPage/>, { route: '/materials?view=list' })
-
-    expect (await screen.findByRole ('link', { name: '詳細素材' })).toHaveAttribute (
+    expect (await screen.findByRole ('link', { name: '追加' })).toHaveAttribute (
         'href',
-        '/materials/9',
-    )
-    expect (screen.getByText ('サイズ:')).toBeInTheDocument ()
-    expect (screen.getByText ('2.0 KB')).toBeInTheDocument ()
-  })
-
-  it ('shows the selected tag scope and tag-specific add links', async () => {
-    api.apiGet.mockResolvedValueOnce ({
-      materials: [
-        buildMaterial ({
-          id:  10,
-          tag: buildTag ({ id: 30, name: '泣き', category: 'material' }),
-        }),
-      ],
-      count:    1,
-      tagScope: {
-        tag:                { id: 20, name: '伊地知ニジカ', category: 'material' },
-        includeDescendants: true,
-      },
-      groups: [
-        {
-          key:         'tag:30',
-          tag:         { id: 30, name: '泣き', category: 'material' },
-          materialIds: [10],
-          count:       1,
-        },
-      ],
-    })
-
-    renderWithProviders (
-        <MaterialListPage/>,
-        { route: '/materials?tag_id=20&include_descendants=1&group_by=parent_tag' },
-    )
-
-    expect (await screen.findByText (
-        (_, element) => element?.textContent === '伊地知ニジカ 配下の素材を表示中',
-    )).toBeInTheDocument ()
-
-    expect (screen.getByRole ('link', { name: '泣き' })).toHaveAttribute (
-        'href',
-        '/materials?tag_id=30&include_descendants=1&group_by=parent_tag&material_filter=present',
-    )
-    expect (screen.getByRole ('link', { name: 'タグ選択を解除' })).toHaveAttribute (
-        'href',
-        '/materials?material_filter=present',
-    )
-  })
-
-  it ('shows a clear link when tag_id does not resolve to tag_scope', async () => {
-    api.apiGet.mockResolvedValueOnce ({
-      materials: [],
-      count:     0,
-      tagScope:  null,
-      groups:    [],
-    })
-
-    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag_id=999' })
-
-    expect (await screen.findByText ('選択中タグが見つかりません．')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: 'タグ選択を解除' })).toHaveAttribute (
-        'href',
-        '/materials?material_filter=present',
+        '/materials/new?tag=%E6%9C%AA%E7%99%BB%E9%8C%B2',
     )
   })
 })

frontend/src/pages/materials/MaterialListPage.tsx

@@ -10,23 +10,21 @@ import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import Pagination from '@/components/common/Pagination'
 import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
+import { API_BASE_URL, SITE_TITLE } from '@/config'
 import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
 
 import type { FC, FormEvent } from 'react'
 
-import type { FetchMaterialsParams,
-	      Material,
-	      MaterialFilter,
-	      MaterialIndexGroup,
-	      MaterialIndexGroupBy,
-	      MaterialIndexDirection,
-	      MaterialIndexMediaKind,
-	      MaterialIndexSort,
-	      MaterialIndexTagState,
-	      MaterialIndexView } from '@/types'
+import type {
+    FetchMaterialsParams,
+    Material,
+    MaterialIndexDirection,
+    MaterialIndexMediaKind,
+    MaterialIndexSort,
+    MaterialIndexTagState,
+    MaterialIndexView } from '@/types'
 
 const MEDIA_KIND_LABELS: Record<Material['mediaKind'], string> = {
     image:      '画像',
@@ -41,16 +39,16 @@ const MEDIA_FILTER_LABELS: Record<MaterialIndexMediaKind, string> = {
     video:      '動画',
     audio:      '音声',
     file_other: 'その他ファイル',
-    url_only:   '外部リンクのみ'}
+    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: '容量',
-    version_no:     '版',
-    id:             'Id.'}
+    file_byte_size: 'ファイルサイズ',
+    version_no:     'バージョン',
+    id:             'ID'}
 
 
 const setIf = (qs: URLSearchParams, key: string, value: string | null) => {
@@ -81,36 +79,6 @@ const materialTitle = (material: Material): string =>
     material.tag?.name ?? `素材 #${ material.id }`
 
 
-const groupedTagPath = (
-    tagId: number,
-    materialFilter: MaterialFilter,
-): string =>
-    `/materials?tag_id=${ tagId }&include_descendants=1&group_by=parent_tag`
-    + `&material_filter=${ materialFilter }`
-
-
-const materialNewPath = (
-    tagName: string,
-    returnTo: string,
-): string =>
-    `/materials/new?tag=${ encodeURIComponent (tagName) }`
-    + `&return_to=${ encodeURIComponent (returnTo) }`
-
-
-const clearedTagSelectionPath = (
-    locationSearch: string,
-    materialFilter: MaterialFilter,
-): string => {
-    const qs = new URLSearchParams (locationSearch)
-    qs.delete ('tag_id')
-    qs.delete ('include_descendants')
-    qs.delete ('group_by')
-    qs.delete ('page')
-    qs.set ('material_filter', materialFilter)
-    return `/materials?${ qs.toString () }`
-}
-
-
 const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
     <div
 	className={`flex aspect-square h-[180px] w-[180px] items-center justify-center
@@ -118,7 +86,7 @@ const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
 		    text-stone-900 shadow-sm dark:border-stone-700 dark:bg-stone-900
 		    dark:text-stone-100`}>
       {material.thumbnail
-       ? <img src={material.thumbnail} alt="" className="block h-full w-full object-cover"/>
+       ? <img src={material.thumbnail} alt="" className="h-full w-full object-contain"/>
        : (
 	  <span
 	      className="px-2 text-2xl leading-tight"
@@ -186,28 +154,6 @@ const MaterialListItem: FC<{ material: Material }> = ({ material }) => (
     </article>)
 
 
-const GroupHeading: FC<{
-    count:          number
-    materialFilter: MaterialFilter
-    title:          string
-    tagId:          number
-}> = ({ count, materialFilter, title, tagId }) => (
-    <div className="flex items-center gap-2 border-b border-stone-200 pb-2
-		    dark:border-stone-700">
-      <PrefetchLink
-	  to={groupedTagPath (tagId, materialFilter)}
-	  className="font-medium text-sky-700 underline underline-offset-2
-		     dark:text-sky-300 w-full">
-	{title}
-      </PrefetchLink>
-      <div className="text-right w-auto">
-	<span className="text-nowrap text-sm text-stone-600 dark:text-stone-300">
-	  {count} 件
-	</span>
-      </div>
-    </div>)
-
-
 const MaterialListPage: FC = () => {
   const location = useLocation ()
   const navigate = useNavigate ()
@@ -216,10 +162,7 @@ const MaterialListPage: FC = () => {
 
   const page = Number (query.get ('page') ?? 1)
   const limit = Number (query.get ('limit') ?? 20)
-  const qQuery = query.get ('q') ?? ''
-  const tagIdQuery = Number (query.get ('tag_id') ?? 0)
-  const tagId = tagIdQuery > 0 ? tagIdQuery : null
-  const includeDescendants = query.get ('include_descendants') === '1'
+  const qQuery = query.get ('q') ?? query.get ('tag') ?? ''
   const tagState = query.get ('unclassified') === '1'
       ? 'untagged'
       : parseOption<MaterialIndexTagState> (
@@ -239,11 +182,6 @@ const MaterialListPage: FC = () => {
       query.get ('direction'),
       ['asc', 'desc'],
       'desc')
-  const groupByQuery = parseOption<MaterialIndexGroupBy> (
-      query.get ('group_by'),
-      ['none', 'parent_tag'],
-      'none')
-  const groupBy = tagId == null ? 'none' : groupByQuery
   const view = parseOption<MaterialIndexView> (query.get ('view'), ['card', 'list'], 'card')
   const createdFromQuery = query.get ('created_from') ?? ''
   const createdToQuery = query.get ('created_to') ?? ''
@@ -253,7 +191,6 @@ const MaterialListPage: FC = () => {
   const [q, setQ] = useState ('')
   const [tagStateInput, setTagStateInput] = useState<MaterialIndexTagState> ('all')
   const [mediaKindInput, setMediaKindInput] = useState<MaterialIndexMediaKind> ('all')
-  const [groupByInput, setGroupByInput] = useState<MaterialIndexGroupBy> ('none')
   const [createdFrom, setCreatedFrom] = useState<string | null> (null)
   const [createdTo, setCreatedTo] = useState<string | null> (null)
   const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
@@ -263,9 +200,6 @@ const MaterialListPage: FC = () => {
       q: qQuery,
       tagState,
       mediaKind,
-      tagId,
-      includeDescendants,
-      groupBy,
       createdFrom: createdFromQuery,
       createdTo: createdToQuery,
       updatedFrom: updatedFromQuery,
@@ -278,33 +212,18 @@ const MaterialListPage: FC = () => {
   const { data, isLoading, isError } = useQuery ({
       queryKey: materialsKeys.index (keys),
       queryFn:  () => fetchMaterials (keys)})
-  const tagScope = data?.tagScope ?? null
   const materials = data?.materials ?? []
-  const groups = data?.groups ?? []
   const totalPages = data ? Math.ceil (data.count / limit) : 0
-  const materialsById = useMemo (
-      () => new Map (materials.map (material => [material.id, material])),
-      [materials],
-  )
-  const groupedMaterialIds = useMemo (
-      () => new Set (groups.flatMap (group => group.materialIds)),
-      [groups],
-  )
-  const ungroupedMaterials = useMemo (
-      () => materials.filter (material => !groupedMaterialIds.has (material.id)),
-      [groupedMaterialIds, materials],
-  )
 
   useEffect (() => {
     setQ (qQuery)
     setTagStateInput (tagState)
     setMediaKindInput (mediaKind)
-    setGroupByInput (groupBy)
     setCreatedFrom (createdFromQuery)
     setCreatedTo (createdToQuery)
     setUpdatedFrom (updatedFromQuery)
     setUpdatedTo (updatedToQuery)
-  }, [createdFromQuery, createdToQuery, groupBy, mediaKind, qQuery, tagState,
+  }, [createdFromQuery, createdToQuery, mediaKind, qQuery, tagState,
       updatedFromQuery, updatedToQuery])
 
   const search = (e: FormEvent) => {
@@ -320,77 +239,19 @@ const MaterialListPage: FC = () => {
     setIf (qs, 'updated_to', updatedTo)
     qs.set ('sort', sort)
     qs.set ('direction', direction)
-    qs.set ('group_by', tagId == null ? 'none' : groupByInput)
     qs.set ('view', view)
     qs.set ('page', '1')
     qs.set ('limit', String (limit))
     qs.set ('material_filter', materialFilter)
-    if (tagId != null)
-      qs.set ('tag_id', String (tagId))
-
-    if (includeDescendants)
-      qs.set ('include_descendants', '1')
-
     navigate (`/materials?${ qs.toString () }`)
   }
 
   const updateQuery = (changes: Record<string, string>) => {
     const qs = new URLSearchParams (location.search)
-    Object.entries (changes).forEach (([key, value]) => {
-      if (value === '')
-	qs.delete (key)
-      else
-	qs.set (key, value)
-    })
+    Object.entries (changes).forEach (([key, value]) => qs.set (key, value))
     navigate (`/materials?${ qs.toString () }`)
   }
 
-  const renderMaterialCollection = (rows: Material[]) =>
-      view === 'card'
-      ? (
-	  <div className="grid grid-cols-[repeat(auto-fill,minmax(196px,1fr))]
-			  justify-items-center gap-4">
-	    {rows.map (material => (
-		<MaterialCard key={material.id} material={material}/>))}
-	  </div>)
-      : (
-	  <div className="space-y-3">
-	    {rows.map (material => (
-		<MaterialListItem key={material.id} material={material}/>))}
-	  </div>)
-
-  const renderGroupedMaterials = (materialGroups: MaterialIndexGroup[]) => (
-      <div className="space-y-6">
-	{materialGroups.map (group => {
-	  const groupMaterials =
-	      group.materialIds
-	      .map (materialId => materialsById.get (materialId))
-	      .filter ((material): material is Material => material != null)
-
-	  if (groupMaterials.length === 0)
-	    return null
-
-	  return (
-	      <section key={group.key} className="space-y-3">
-		<GroupHeading
-		    tagId={group.tag.id}
-		    title={group.tag.name}
-		    count={group.count}
-		    materialFilter={materialFilter}/>
-		{renderMaterialCollection (groupMaterials)}
-	      </section>)
-	})}
-	{ungroupedMaterials.length > 0 && (
-	    <section className="space-y-3">
-	      <div className="border-b border-stone-200 pb-2 dark:border-stone-700">
-		<span className="font-medium text-stone-900 dark:text-stone-100">
-		  その他
-		</span>
-	      </div>
-	      {renderMaterialCollection (ungroupedMaterials)}
-	    </section>)}
-      </div>)
-
   return (
       <MainArea>
 	<Helmet>
@@ -402,15 +263,35 @@ const MaterialListPage: FC = () => {
 		  src: url(${ nikumaru }) format('opentype');
 		}`}
 	  </style>
-	  <title>{`素材管理 | ${ SITE_TITLE }`}</title>
+	  <title>{`素材一覧 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
 	<div className="space-y-5">
 	  <div className="flex flex-wrap items-center justify-between gap-3">
-	    <PageTitle className="my-auto">素材管理</PageTitle>
+	    <PageTitle>素材一覧</PageTitle>
 	    <div className="flex flex-wrap gap-2">
-	      {/* TODO: 局所出力を可能にする */}
-	      {/* <a
+	      <PrefetchLink
+		  to="/materials/new"
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+		新規素材を追加
+	      </PrefetchLink>
+	      <PrefetchLink
+		  to="/materials/suppressions"
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+		同期元抑止
+	      </PrefetchLink>
+	      <PrefetchLink
+		  to="/materials/changes"
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+		履歴
+	      </PrefetchLink>
+	      <a
 		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
 		  target="_blank"
 		  rel="noopener noreferrer"
@@ -418,38 +299,10 @@ const MaterialListPage: FC = () => {
 			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
 			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
 		ZIP をダウンロード
-	      </a> */}
+	      </a>
 	    </div>
 	  </div>
 
-	  {tagScope && (
-	      <div className="flex flex-wrap items-center gap-3 rounded-lg border
-			      border-sky-200 bg-sky-50 px-4 py-3 text-sm text-sky-900
-			      dark:border-sky-800 dark:bg-sky-950 dark:text-sky-100">
-		<span>
-		  {tagScope.tag.name}
-		  {tagScope.includeDescendants ? ' 配下の素材を表示中' : ' の素材を表示中'}
-		</span>
-		<PrefetchLink
-		    to={clearedTagSelectionPath (location.search, materialFilter)}
-		    className="font-medium underline underline-offset-2
-			       text-sky-700 dark:text-sky-300">
-		  タグ選択を解除
-		</PrefetchLink>
-	      </div>)}
-	  {(tagId != null && tagScope == null) && (
-	      <div className="flex flex-wrap items-center gap-3 rounded-lg border
-			      border-amber-200 bg-amber-50 px-4 py-3 text-sm text-amber-900
-			      dark:border-amber-800 dark:bg-amber-950 dark:text-amber-100">
-		<span>選択中タグが見つかりません．</span>
-		<PrefetchLink
-		    to={clearedTagSelectionPath (location.search, materialFilter)}
-		    className="font-medium underline underline-offset-2
-			       text-amber-800 dark:text-amber-200">
-		  タグ選択を解除
-		</PrefetchLink>
-	      </div>)}
-
 	  {tagState === 'untagged' && (
 	      <PrefetchLink
 		  to={`/materials?material_filter=${ materialFilter }`}
@@ -542,7 +395,7 @@ const MaterialListPage: FC = () => {
 		      : [
 			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
 			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
-		アイコン
+		カード
 	      </button>
 	      <button
 		  type="button"
@@ -555,7 +408,7 @@ const MaterialListPage: FC = () => {
 		      : [
 			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
 			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
-		詳細
+		一覧
 	      </button>
 	    </div>
 
@@ -583,22 +436,20 @@ const MaterialListPage: FC = () => {
 	  {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。
-		{(tagScope && ['character', 'material'].includes (tagScope.tag.category)) && (
-		    <>
-		      <PrefetchLink
-			  to={materialNewPath (tagScope.tag.name, location.pathname + location.search)}
-			  className="font-medium underline underline-offset-2
-				     text-sky-700 dark:text-sky-300">
-			追加してください
-		      </PrefetchLink>。
-		    </>)}
-	      </p>)}
+	      <p>素材はありません．</p>)}
 	  {materials.length > 0 && (
-	      groupBy === 'parent_tag' && groups.length > 0
-	      ? renderGroupedMaterials (groups)
-	      : renderMaterialCollection (materials))}
+	      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.test.tsx

@@ -1,6 +1,5 @@
 import { fireEvent, screen, waitFor } from '@testing-library/react'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
-import { Route, Routes, useLocation } from 'react-router-dom'
 
 import MaterialNewPage from '@/pages/materials/MaterialNewPage'
 import { renderWithProviders } from '@/test/render'
@@ -18,11 +17,6 @@ const toastApi = vi.hoisted (() => ({
 vi.mock ('@/lib/api', () => api)
 vi.mock ('@/components/ui/use-toast', () => toastApi)
 
-const LocationView = () => {
-  const location = useLocation ()
-  return <div>{location.pathname + location.search}</div>
-}
-
 describe ('MaterialNewPage', () => {
   beforeEach (() => {
     vi.clearAllMocks ()
@@ -75,50 +69,4 @@ describe ('MaterialNewPage', () => {
     expect (await screen.findAllByText ('ファイルまたは URL は必須です．')).toHaveLength (2)
     expect (screen.getAllByRole ('textbox')[1]).toHaveAttribute ('aria-invalid', 'true')
   })
-
-  it ('returns only to safe material URLs after successful creation', async () => {
-    api.apiPost.mockResolvedValueOnce ({})
-
-    renderWithProviders (
-        <Routes>
-          <Route path="/materials/new" element={<MaterialNewPage/>}/>
-          <Route path="/materials" element={<LocationView/>}/>
-        </Routes>,
-        {
-          route:
-              '/materials/new?tag=%E8%99%B9%E5%A4%8F'
-              + '&return_to=%2Fmaterials%3Ftag_id%3D20',
-        },
-    )
-
-    fireEvent.change (screen.getAllByRole ('textbox')[1], {
-      target: { value: 'https://example.com/ref' },
-    })
-    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
-
-    expect (await screen.findByText ('/materials?tag_id=20')).toBeInTheDocument ()
-  })
-
-  it ('ignores unsafe return_to values after successful creation', async () => {
-    api.apiPost.mockResolvedValueOnce ({})
-
-    renderWithProviders (
-        <Routes>
-          <Route path="/materials/new" element={<MaterialNewPage/>}/>
-          <Route path="/materials" element={<LocationView/>}/>
-        </Routes>,
-        {
-          route:
-              '/materials/new?tag=%E8%99%B9%E5%A4%8F'
-              + '&return_to=https%3A%2F%2Fexample.com%2Fevil',
-        },
-    )
-
-    fireEvent.change (screen.getAllByRole ('textbox')[1], {
-      target: { value: 'https://example.com/ref' },
-    })
-    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
-
-    expect (await screen.findByText ('/materials')).toBeInTheDocument ()
-  })
 })

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -27,8 +27,6 @@ const MaterialNewPage: FC = () => {
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const tagQuery = query.get ('tag') ?? ''
-  const returnToQuery = query.get ('return_to') ?? ''
-  const safeReturnTo = returnToQuery.startsWith ('/materials') ? returnToQuery : ''
 
   const navigate = useNavigate ()
 
@@ -56,7 +54,7 @@ const MaterialNewPage: FC = () => {
       onSuccess: async () => {
 	await qc.invalidateQueries ({ queryKey: materialsKeys.root })
 	toast ({ title: '送信成功!' })
-	navigate (safeReturnTo || '/materials')
+	navigate (`/materials?tag=${ encodeURIComponent (tag) }`)
       },
       onError: error => {
 	applyValidationError (error)

frontend/src/pages/materials/MaterialSearchPage.tsx

@@ -0,0 +1,51 @@
+import { useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+
+import FormField from '@/components/common/FormField'
+import PageTitle from '@/components/common/PageTitle'
+import TagInput from '@/components/common/TagInput'
+import MainArea from '@/components/layout/MainArea'
+import { SITE_TITLE } from '@/config'
+
+import type { FC, FormEvent } from 'react'
+
+
+const MaterialSearchPage: FC = () => {
+  const [tagName, setTagName] = useState ('')
+  const [parentTagName, setParentTagName] = useState ('')
+
+  const handleSearch = (e: FormEvent) => {
+    e.preventDefault ()
+  }
+
+  return (
+      <MainArea>
+	<Helmet>
+	  <title>素材集 | {SITE_TITLE}</title>
+	</Helmet>
+
+	<div className="max-w-xl">
+	  <PageTitle>素材集</PageTitle>
+
+	  <form onSubmit={handleSearch} className="space-y-2">
+	    {/* タグ */}
+	    <FormField label="タグ">
+	      {() => (
+		  <TagInput
+		      value={tagName}
+		      setValue={setTagName}/>)}
+	    </FormField>
+
+	    {/* 親タグ */}
+	    <FormField label="親タグ">
+	      {() => (
+		  <TagInput
+		      value={parentTagName}
+		      setValue={setParentTagName}/>)}
+	    </FormField>
+	  </form>
+	</div>
+      </MainArea>)
+}
+
+export default MaterialSearchPage

frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx

@@ -2,13 +2,17 @@ import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
+import PrefetchLink from '@/components/PrefetchLink'
 import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 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 { createMaterialSyncSuppression, fetchMaterialSyncSuppressions } from '@/lib/materials'
+import {
+    createMaterialSyncSuppression,
+    fetchMaterialSyncSuppressions,
+} from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
 
@@ -18,11 +22,11 @@ import type { MaterialSyncSuppressionSourceKind } from '@/types'
 
 const SOURCE_KIND_LABELS: Record<MaterialSyncSuppressionSourceKind, string> = {
     uri:               'URI',
-    google_drive_path: 'Google Drive ファイル',
-    google_drive_path_prefix: 'Google Drive フォルダ',
-    google_drive_file: 'Google Drive ファイル Id.',
-    legacy_drive_path: '汎用ファイル',
-    legacy_drive_path_prefix: '汎用フォルダ' }
+    google_drive_path: 'Google Drive path',
+    google_drive_path_prefix: 'Google Drive path prefix',
+    google_drive_file: 'Google Drive file ID',
+    legacy_drive_path: 'Legacy Drive path',
+    legacy_drive_path_prefix: 'Legacy Drive path prefix'}
 
 const REASONS = [
     'copyright_high_risk',
@@ -32,23 +36,7 @@ const REASONS = [
     'malware_or_dangerous_file',
     'duplicate_or_low_quality',
     'source_owner_request',
-    'other'] as const
-
-type MaterialSyncSuppressionReason = typeof REASONS[number]
-
-const REASON_NAMES: Record<MaterialSyncSuppressionReason, string> = {
-    ['copyright_high_risk']: '著作権への懸念',
-    ['copyright_takedown']: '著作者からの申出',
-    ['adult_or_sensitive']: '成人向け',
-    ['personal_information']: '個人情報',
-    ['malware_or_dangerous_file']: '危険なソフトウェア',
-    ['duplicate_or_low_quality']: '重複',
-    ['source_owner_request']: '同期元管理者からの申出',
-    ['other']: 'その他' } as const
-
-
-const reasonName = (reason: string): string =>
-    REASON_NAMES[reason as MaterialSyncSuppressionReason] ?? reason
+    'other']
 
 
 const MaterialSyncSuppressionsPage: FC = () => {
@@ -58,7 +46,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
   const [sourceUri, setSourceUri] = useState ('')
   const [drivePath, setDrivePath] = useState ('')
   const [driveFileId, setDriveFileId] = useState ('')
-  const [reason, setReason] = useState<MaterialSyncSuppressionReason> (REASONS[0])
+  const [reason, setReason] = useState (REASONS[0])
 
   const { data, isError, isLoading } = useQuery ({
       queryKey: materialsKeys.suppressions (),
@@ -94,11 +82,18 @@ const MaterialSyncSuppressionsPage: FC = () => {
   return (
       <MainArea>
 	<Helmet>
-	  <title>{`素材同期抑止 | ${ SITE_TITLE }`}</title>
+	  <title>{`同期元抑止 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
 	<div className="space-y-5">
-	  <PageTitle>同期抑止</PageTitle>
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <PageTitle>同期元抑止</PageTitle>
+	    <PrefetchLink
+		to="/materials"
+		className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+	      素材一覧へ戻る
+	    </PrefetchLink>
+	  </div>
 
 	  <form
 	      onSubmit={handleSubmit}
@@ -120,7 +115,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    </select>)}
 	      </FormField>
 
-	      <FormField label="同期元 URI">
+	      <FormField label="Source URI">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -129,7 +124,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="Google Drive パス">
+	      <FormField label="Drive path">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -138,7 +133,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="Google Drive ファイル Id.">
+	      <FormField label="Drive file ID">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -147,15 +142,15 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="事由">
+	      <FormField label="理由">
 		{({ invalid }) => (
 		    <select
 			value={reason}
-			onChange={e => setReason (e.target.value as MaterialSyncSuppressionReason)}
+			onChange={e => setReason (e.target.value)}
 			className={inputClass (invalid)}>
 		      {REASONS.map (value => (
 			  <option key={value} value={value}>
-			    {REASON_NAMES[value]}
+			    {value}
 			  </option>))}
 		    </select>)}
 	      </FormField>
@@ -190,8 +185,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    {suppression.normalizedSourceKey}
 		  </div>
 		  <div className="mt-2 text-sm text-stone-600 dark:text-stone-400">
-		    事由: {reasonName (suppression.reason)} /
-		    登録: {dateString (suppression.createdAt)}
+		    理由: {suppression.reason} / 登録: {dateString (suppression.createdAt)}
 		  </div>
 		</article>))}
 	  </div>

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -91,13 +91,9 @@ const PostHistoryPage: FC = () => {
 	  .filter (p => p.type !== 'removed')
 	  .map (p => p.id)
 	  .join (' ')
-      const duration =
-	  change.videoMs.current == null
-	  ? null
-	  : String (change.videoMs.current / 1_000)
       const originalCreatedFrom = change.originalCreatedFrom.current
       const originalCreatedBefore = change.originalCreatedBefore.current
-      await updatePost ({ id, title, tags, duration, parentPostIds,
+      await updatePost ({ id, title, tags, parentPostIds,
 			  originalCreatedFrom, originalCreatedBefore },
 		        { force: true })
 

frontend/src/pages/posts/PostNewPage.test.tsx

@@ -62,24 +62,6 @@ describe ('PostNewPage', () => {
     expect (toastApi.toast).toHaveBeenCalledWith ({ title: '投稿成功!' })
   })
 
-  it ('preserves duration while the video tag is temporarily removed', () => {
-    api.apiGet.mockResolvedValue ([])
-
-    renderWithProviders (<PostNewPage user={buildUser ({ role: 'member' })}/>)
-
-    const tags = screen.getAllByRole ('textbox')[3]
-    fireEvent.change (tags, { target: { value: '動画' } })
-    fireEvent.change (screen.getByRole ('spinbutton'), { target: { value: '180.5' } })
-
-    fireEvent.change (tags, { target: { value: 'general-tag' } })
-    expect (screen.queryByRole ('spinbutton')).not.toBeInTheDocument ()
-
-    fireEvent.change (tags, {
-      target: { value: '動画 general-tag' },
-    })
-    expect (screen.getByRole ('spinbutton')).toHaveValue (180.5)
-  })
-
   it ('shows 422 validation errors for post fields', async () => {
     api.apiGet.mockResolvedValue ([])
     api.isApiError.mockReturnValue (true)

frontend/src/pages/posts/PostNewPage.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import { useCallback, useEffect, useState, useRef } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useNavigate } from 'react-router-dom'
 
@@ -25,7 +25,7 @@ import type { User } from '@/types'
 type Props = { user: User | null }
 
 type PostFormField =
-    'url' | 'title' | 'tags' | 'parentPostIds' | 'videoMs' | 'originalCreatedAt' | 'thumbnail'
+    'url' | 'title' | 'tags' | 'parentPostIds' | 'originalCreatedAt' | 'thumbnail'
 
 
 const PostNewPage: FC<Props> = ({ user }) => {
@@ -40,7 +40,6 @@ const PostNewPage: FC<Props> = ({ user }) => {
   const [originalCreatedFrom, setOriginalCreatedFrom] = useState<string | null> (null)
   const [parentPostIds, setParentPostIds] = useState ('')
   const [tags, setTags] = useState ('')
-  const [duration, setDuration] = useState ('')
   const [thumbnailAutoFlg, setThumbnailAutoFlg] = useState (true)
   const [thumbnailFile, setThumbnailFile] = useState<File | null> (null)
   const [thumbnailLoading, setThumbnailLoading] = useState (false)
@@ -52,9 +51,6 @@ const PostNewPage: FC<Props> = ({ user }) => {
 
   const previousURLRef = useRef ('')
   const thumbnailPreviewRef = useRef ('')
-  const videoFlg =
-      useMemo (() => tags.split (/\s+/).some (tag => tag.replace (/\[.*\]$/, '') === '動画'),
-               [tags])
 
   const handleSubmit = async () => {
     clearValidationErrors ()
@@ -64,8 +60,6 @@ const PostNewPage: FC<Props> = ({ user }) => {
     formData.append ('url', url)
     formData.append ('tags', tags)
     formData.append ('parent_post_ids', parentPostIds)
-    if (videoFlg && duration !== '')
-      formData.append ('duration', duration)
     if (thumbnailFile)
       formData.append ('thumbnail', thumbnailFile)
     if (originalCreatedFrom)
@@ -239,20 +233,6 @@ const PostNewPage: FC<Props> = ({ user }) => {
 	      setOriginalCreatedBefore={setOriginalCreatedBefore}
 	      errors={fieldErrors.originalCreatedAt}/>
 
-	  {/* 動画時間 */}
-	  {(videoFlg &&
-	      <FormField label="動画時間" messages={fieldErrors.videoMs}>
-		{({ invalid }) => (
-		    <input
-			type="number"
-			min="0.001"
-			step="0.001"
-			value={duration}
-			onChange={e => setDuration (e.target.value)}
-			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"

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

@@ -1,10 +1,9 @@
-import { act, fireEvent, screen, waitFor, within } from '@testing-library/react'
+import { act, fireEvent, screen, waitFor } from '@testing-library/react'
 import { Route, Routes } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import TheatreDetailPage from '@/pages/theatres/TheatreDetailPage'
 import { buildPost,
-	 buildTag,
 	 buildTheatre,
 	 buildTheatreComment,
 	 buildTheatreInfo,
@@ -88,10 +87,6 @@ const weights = buildTheatrePostSelectionWeights ({
     tags:    [],
   }],
 })
-const watchingUsers = [
-  { id: 1, name: 'tester' },
-  { id: 2, name: 'another' },
-]
 
 const renderPage = (user = buildUser ({ id: 1, role: 'member' })) =>
   renderWithProviders (
@@ -101,9 +96,6 @@ const renderPage = (user = buildUser ({ id: 1, role: 'member' })) =>
       { route: '/theatres/7' },
   )
 
-const tagSection = (): HTMLElement =>
-  screen.getAllByRole ('heading', { name: 'タグ' })[0].closest ('section')!
-
 const mockDefaultApi = () => {
   api.apiGet.mockImplementation ((path: string) => {
     switch (path)
@@ -140,11 +132,11 @@ const mockDefaultApi = () => {
         postId:        currentPost.id,
         postStartedAt: '2026-01-02T03:04:05.000Z',
         postElapsedMs: 1_000,
-        watchingUsers,
+        watchingUsers: [{ id: 1, name: 'tester' }],
         skipVote:      {
           votesCount:         0,
           requiredCount:      2,
-          watchingUsersCount: watchingUsers.length,
+          watchingUsersCount: 1,
           voted:              false,
         },
       }))
@@ -154,11 +146,11 @@ const mockDefaultApi = () => {
         postId:        currentPost.id,
         postStartedAt: '2026-01-02T03:04:05.000Z',
         postElapsedMs: 2_000,
-        watchingUsers,
+        watchingUsers: [{ id: 1, name: 'tester' }],
         skipVote:      {
           votesCount:         1,
           requiredCount:      2,
-          watchingUsersCount: watchingUsers.length,
+          watchingUsersCount: 1,
           voted:              true,
         },
       }))
@@ -253,53 +245,6 @@ describe ('TheatreDetailPage', () => {
     expect (postEmbed.seek).not.toHaveBeenCalledWith (0)
   })
 
-  it ('shows child tags from the post tag tree in both vertical and horizontal layouts', async () => {
-    const childTag = buildTag ({ id: 12, name: '子タグ', category: 'general' })
-    const parentTag = buildTag ({
-      id:       11,
-      name:     '親タグ',
-      category: 'general',
-      children: [childTag],
-    })
-    const duplicateParentTag = buildTag ({
-      id:       13,
-      name:     '別親タグ',
-      category: 'general',
-      children: [childTag],
-    })
-
-    postsApi.fetchPost.mockResolvedValueOnce (buildPost ({
-      ...currentPost,
-      tags: [parentTag, duplicateParentTag],
-    }))
-
-    renderPage ()
-
-    await screen.findByText ('Embed:上映中の投稿')
-
-    expect (within (tagSection ()).getByRole ('link', { name: '親タグ' }))
-      .toBeInTheDocument ()
-    expect (within (tagSection ()).getByRole ('link', { name: '別親タグ' }))
-      .toBeInTheDocument ()
-    expect (within (tagSection ()).getAllByRole ('link', { name: '子タグ' })[0])
-      .toBeInTheDocument ()
-    expect (within (tagSection ()).getAllByText ('↳').length).toBeGreaterThan (0)
-
-    fireEvent.click (screen.getByRole ('button', { name: '2 列 A 型' }))
-    fireEvent.click (screen.getAllByRole ('button', { name: '横並び' })[0])
-
-    await waitFor (() => {
-      expect (within (tagSection ()).getByRole ('link', { name: '親タグ' }))
-	.toBeInTheDocument ()
-      expect (within (tagSection ()).getByRole ('link', { name: '別親タグ' }))
-	.toBeInTheDocument ()
-      expect (within (tagSection ()).getByRole ('link', { name: '子タグ' }))
-	.toBeInTheDocument ()
-      expect (within (tagSection ()).getAllByRole ('link', { name: '子タグ' }))
-	.toHaveLength (1)
-    })
-  })
-
   it ('does not advance host post while video length is unknown', async () => {
     api.apiPut.mockImplementation ((path: string) => {
       switch (path)

frontend/src/pages/theatres/TheatreDetailPage.tsx

@@ -102,28 +102,6 @@ const compareTagName = (a: Tag, b: Tag): number =>
     a.name === b.name ? 0 : (a.name < b.name ? -1 : 1)
 
 
-const flattenTags = (tags: Tag[]): Tag[] => {
-  const flattened: Tag[] = []
-  const seen = new Set<number> ()
-
-  const visit = (tag: Tag) => {
-    if (seen.has (tag.id))
-      return
-
-    seen.add (tag.id)
-    flattened.push (tag)
-
-    for (const child of tag.children ?? [])
-      visit (child)
-  }
-
-  for (const tag of tags)
-    visit (tag)
-
-  return flattened
-}
-
-
 const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
   const grouped: Partial<Record<Category, Tag[]>> = { }
 
@@ -140,39 +118,15 @@ const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
 }
 
 
-const renderReadonlyTagTree = (
-    tag:       Tag,
-    nestLevel: number,
-    path:      string,
-    ancestors: Set<number> = new Set<number> (),
-): ReactNode[] => {
-  const key = `${ path }-${ tag.id }`
-  const nextAncestors = new Set (ancestors)
-  nextAncestors.add (tag.id)
-
-  return [
-      (
-	  <li key={key} className="text-left leading-tight">
-	    <TagLink tag={tag} nestLevel={nestLevel} withCount={false}/>
-	  </li>),
-      ...((tag.children ?? [])
-	  .filter (child => !(nextAncestors.has (child.id)))
-	  .sort (compareTagName)
-	  .flatMap (child =>
-	      renderReadonlyTagTree (child, nestLevel + 1, key, nextAncestors)))]
-}
-
-
 const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
     { tags, compact, flow = 'vertical' }) => {
-  const horizontalGrouped = tagsByCategory (flattenTags (tags))
-  const verticalGrouped = tagsByCategory (tags)
+  const grouped = tagsByCategory (tags)
 
   if (flow === 'horizontal')
     {
       return (
 	  <ul className={cn ('flex flex-wrap gap-x-3 gap-y-1', compact && 'text-sm')}>
-	    {CATEGORIES.flatMap (cat => horizontalGrouped[cat] ?? []).map (tag => (
+	    {CATEGORIES.flatMap (cat => grouped[cat] ?? []).map (tag => (
 		<li key={tag.id} className="text-left leading-tight">
 		  <TagLink tag={tag} withCount={false}/>
 		</li>))}
@@ -182,7 +136,7 @@ const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
   return (
       <div className="space-y-3">
 	{CATEGORIES.map (cat => {
-	  const rows = verticalGrouped[cat] ?? []
+	  const rows = grouped[cat] ?? []
 	  if (rows.length === 0)
 	    return null
 
@@ -192,8 +146,10 @@ const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
 		  {CATEGORY_NAMES[cat]}
 		</div>
 		<ul className={cn ('space-y-1', compact && 'text-sm')}>
-		  {rows.flatMap (tag =>
-		      renderReadonlyTagTree (tag, 0, `cat-${ cat }`))}
+		  {rows.map (tag => (
+		      <li key={tag.id} className="text-left leading-tight">
+			<TagLink tag={tag} withCount={false}/>
+		      </li>))}
 		</ul>
 	      </div>)
 	})}

frontend/src/test/factories.ts

@@ -1,6 +1,6 @@
 import type { Material,
 	      Post,
-	      TagWithSections,
+	      Tag,
 	      Theatre,
 	      TheatreComment,
 	      TheatreInfo,
@@ -9,7 +9,7 @@ import type { Material,
 	      User,
 	      WikiPage } from '@/types'
 
-export const buildTag = (overrides: Partial<TagWithSections> = {}): TagWithSections => ({
+export const buildTag = (overrides: Partial<Tag> = {}): Tag => ({
   id:             1,
   name:           'テストタグ',
   category:       'general',
@@ -23,8 +23,6 @@ export const buildTag = (overrides: Partial<TagWithSections> = {}): TagWithSecti
   materialId:     null,
   hasDeerjikists: false,
   matchedAlias:   null,
-  sections:       [],
-  children:       [],
   ...overrides,
 })
 
@@ -35,7 +33,6 @@ export const buildPost = (overrides: Partial<Post> = {}): Post => ({
   title:                 'テスト投稿',
   thumbnail:             'https://example.com/thumb.jpg',
   thumbnailBase:         null,
-  videoMs:               null,
   tags:                  [buildTag ()],
   parentPosts:           [],
   childPosts:            [],

frontend/src/types.ts

@@ -88,26 +88,12 @@ export type MaterialIndexSort =
 
 export type MaterialIndexTagState = 'all' | 'tagged' | 'untagged'
 
-export type MaterialIndexGroupBy = 'none' | 'parent_tag'
-
 export type MaterialIndexView = 'card' | 'list'
 
-export type MaterialTagScope = {
-    tag:                {
-	id:          number
-	name:        string
-	category:    Category
-    }
-    includeDescendants: boolean
-}
-
 export type FetchMaterialsParams = {
     q:            string
     tagState:     MaterialIndexTagState
     mediaKind:    MaterialIndexMediaKind
-    tagId:        number | null
-    includeDescendants: boolean
-    groupBy:      MaterialIndexGroupBy
     createdFrom:  string
     createdTo:    string
     updatedFrom:  string
@@ -184,23 +170,6 @@ export type MaterialExportItem = {
     exportPath:  string
     enabled:     boolean }
 
-export type MaterialIndexGroup = {
-    key:         string
-    tag:         {
-	id:          number
-	name:        string
-	category:    Category
-    }
-    materialIds: number[]
-    count:       number }
-
-export type MaterialIndexResponse = {
-    materials: Material[]
-    count:     number
-    groups?:   MaterialIndexGroup[]
-    tagScope?: MaterialTagScope | null
-}
-
 export type MaterialVersion = {
     id:               number
     materialId:       number
@@ -210,11 +179,6 @@ export type MaterialVersion = {
     tagName:          string | null
     tagCategory:      Category | null
     url:              string | null
-    sourceKind:       string | null
-    sourceUri:        string | null
-    sourcePath:       string | null
-    sourceFileId:     string | null
-    normalizedSourceKey: string | null
     fileBlobId:       number | null
     fileFilename:     string | null
     fileContentType:  string | null
@@ -288,12 +252,11 @@ export type Post = {
     title:                  string | null
     thumbnail:              string | null
     thumbnailBase:          string | null
-    videoMs:                number | null
     postSimilarityEdges?:   {
 			      targetPostId: number
 			      cos:          number
 			  }[]
-    tags:                   TagWithSections[]
+    tags:                   Tag[]
     parentPosts?:           Post[]
     childPosts?:            Post[]
     siblingPosts?:          Record<`${ number }`, Post[]>
@@ -321,7 +284,6 @@ export type PostVersion = {
     url:                    { current: string; prev: string | null }
     thumbnail:              { current: string | null; prev: string | null }
     thumbnailBase:          { current: string | null; prev: string | null }
-    videoMs:                { current: number | null; prev: number | null }
     tags:                   { name: string
 			      type: 'context' | 'added' | 'removed' }[]
     parentPosts:            { id: number
@@ -371,10 +333,6 @@ export type TagVersion = {
     createdAt:              string
     createdByUser:          { id: number; name: string | null } | null }
 
-export type TagWithSections = Omit<Tag, 'children'> & { sections: { beginMs:  number
-								    endMs:    number | null }[]
-					              children: TagWithSections[] }
-
 export type Theatre = {
     id:             number
     name:           string | null