#378

backend/AGENTS.md

@@ -67,192 +67,6 @@ pass or the remaining failure is clearly blocked.
 Before changing behavior, inspect the matching route, controller, model,
 service, representation, and spec.
 
-## Shared backend systems
-
-Before adding backend behaviour, search the existing backend first. At minimum,
-check these locations:
-
-- `app/controllers`
-- `app/controllers/concerns`
-- `app/models`
-- `app/models/concerns`
-- `app/representations`
-- `app/services`
-- `app/services/*`
-- `app/jobs`
-- `lib`
-- `lib/tasks`
-- `config/initializers`
-
-Do not infer commonality from directory names alone. Read the actual
-responsibility and representative usage sites.
-
-### Controller reuse
-
-Before adding logic to a controller, inspect:
-
-- `ApplicationController` authentication, authorization, BAN, and IP BAN
-- existing render and validation-error helpers
-- existing param parsing
-- controller concerns
-- the controller for the same resource
-- existing services
-- existing representations
-
-Keep controllers focused on:
-
-- authentication and authorization
-- parameter intake
-- service and model invocation
-- HTTP status selection
-- representation selection
-
-Do not reimplement these per controller when an existing path already owns
-them:
-
-- authentication and role checks
-- validation error JSON
-- URL normalisation
-- tag normalisation
-- thumbnail handling
-- version recording
-- complex transactions
-- external HTTP fetching
-- response representation assembly
-
-### Authentication, authorization, and BAN
-
-Treat these as the canonical backend entrypoints:
-
-- `ApplicationController#authenticate_user`
-- `current_user`
-- `X-Transfer-Code`
-- `reject_banned_ip_address!`
-- `reject_banned_user!`
-- `gte_member?`
-- `admin?`
-
-Do not create feature-local permission services, role comparisons, or header
-parsing when the existing authentication boundary already owns the behaviour.
-If the current boundary is insufficient, extend it minimally instead of adding
-another permission path.
-
-### Representations
-
-If an endpoint for the same resource already uses `app/representations`, do not
-assemble a separate JSON shape directly inside the controller without first
-checking the existing representation contract.
-
-Inspect at least:
-
-- `PostRepr`
-- `TagRepr`
-- `MaterialRepr`
-- `TheatreRepr`
-- `UserRepr`
-- `WikiPageRepr`
-- `DeerjikistRepr`
-
-When a lightweight response is genuinely different in purpose, keep it
-deliberate and compatible with the surrounding contracts. Do not force every
-identifier list into a large representation, but do not fork the same resource
-shape casually either.
-
-### Domain services
-
-When work touches multiple models, transactions, external APIs, file handling,
-history creation, or multi-step workflow, search `app/services` first.
-
-At minimum, search for existing services in these responsibility areas:
-
-- version recorder and versioning
-- wiki commit
-- YouTube or Google Drive API client
-- material sync or ZIP export
-- similarity calculation
-- theatre selection or skip finalisation
-- metadata, thumbnail, or file processing
-- URL normaliser or sanitisation
-- import or export
-- preview safety or HTTP fetch
-
-Do not create a same-responsibility service under another namespace or another
-name. If an existing service is close, extend that API minimally instead of
-wrapping it in a feature-local service.
-
-### Versioning
-
-When a feature writes history, snapshots, or restore roots, search the existing
-versioning path first. At minimum, inspect:
-
-- `VersionRecorder`
-- `PostVersionRecorder`
-- `TagVersionRecorder`
-- `TagVersioning`
-- `MaterialVersionRecorder`
-- `NicoTagVersionRecorder`
-- `WikiVersionRecorder`
-
-Do not implement history writes in controllers, callbacks, or ad hoc feature
-services when the recorder layer already owns the transaction boundary and
-meaning.
-
-### Normalisation, sanitisation, and parsing
-
-For URLs, tag names, times, video durations, identifiers, and paths, search the
-existing normaliser, sanitisation rule, parser, and model-callback path first.
-
-Do not let frontend, controller, service, and model each invent different rules
-for the same value. Use one canonical normalisation path and keep input
-validation distinct from pre-persistence normalisation.
-
-### External HTTP and URL safety
-
-When fetching external URLs, reuse the existing preview-safety stack. Search at
-least for:
-
-- URL safety
-- redirect validation
-- response size limits
-- timeouts
-- network failure mapping
-- HTML metadata extraction
-- known-site extraction
-- thumbnail fetching
-
-Do not add direct `Net::HTTP`, `Faraday`, or equivalent feature-local HTTP code
-that reimplements SSRF checks, redirect restrictions, size limits, or timeouts.
-If the current fetcher is insufficient, extend its existing safety contract.
-
-### Storage, files, and Active Storage
-
-When handling files, thumbnails, ZIP output, object storage, or Active Storage
-blobs, inspect existing storage helpers, exporters, thumbnail generators, and
-checksum helpers first. Do not reimplement the same attach, export path,
-download, resize, or checksum flow in a controller or one-off service.
-
-### Concerns
-
-Do not create controller or model concerns merely because some code is shared.
-Use a concern only when multiple classes share the same lifecycle, macro,
-callback, or tightly cohesive behaviour. Utility collections belong in explicit
-objects or services, not in `CommonConcern`, `SharedMethods`, or `Utils`.
-
-### Model boundaries
-
-Model-specific invariants, associations, validations, and normalisation may
-live in the model. Multi-model workflow, external access, complex transaction
-flow, and feature orchestration belong in services. Do not hide feature
-workflow in model callbacks.
-
-### Transactions, locking, and race handling
-
-If transactions, locking, idempotency, or race recovery already exist in a
-service or model method, do not add a second implementation in a controller or
-new service. Inspect the existing transaction boundary first, avoid wrapping
-the same operation in needless nested transactions, and handle unique-constraint
-races according to the target constraint's business meaning.
-
 ## Ruby style
 
 - Prefer precise, minimal changes.

backend/app/controllers/material_sync_suppressions_controller.rb

@@ -1,49 +0,0 @@
-class MaterialSyncSuppressionsController < ApplicationController
-  def index
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    suppressions =
-        MaterialSyncSuppression
-        .includes(:created_by_user)
-        .order(created_at: :desc, id: :desc)
-
-    render json: { suppressions: suppressions.map { |s| repr(s) } }
-  end
-
-  def create
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
-
-    suppression =
-        MaterialSyncSuppressionRegistrar.create!(suppression_params,
-                                                 created_by_user: current_user)
-
-    render json: repr(suppression), status: :created
-  rescue ActiveRecord::RecordInvalid => e
-    render_validation_error e.record
-  end
-
-  private
-
-  def suppression_params
-    params.permit(:source_kind,
-                  :source_uri,
-                  :drive_path,
-                  :drive_file_id,
-                  :reason)
-  end
-
-  def repr suppression
-    { id: suppression.id,
-      source_kind: suppression.source_kind,
-      source_uri: suppression.source_uri,
-      drive_path: suppression.drive_path,
-      drive_file_id: suppression.drive_file_id,
-      normalized_source_key: suppression.normalized_source_key,
-      reason: suppression.reason,
-      created_by_user: suppression.created_by_user&.as_json(UserRepr::BASE),
-      created_at: suppression.created_at,
-      updated_at: suppression.updated_at }
-  end
-end

backend/app/controllers/material_versions_controller.rb

@@ -1,54 +0,0 @@
-class MaterialVersionsController < ApplicationController
-  def index
-    page = (params[:page].presence || 1).to_i
-    limit = (params[:limit].presence || 20).to_i
-
-    page = 1 if page < 1
-    limit = 1 if limit < 1
-
-    offset = (page - 1) * limit
-
-    q = MaterialVersion.includes(:created_by_user)
-    q = q.where(material_id: params[:material_id]) if params[:material_id].present?
-    q = q.where(tag_name: params[:tag].to_s.strip) if params[:tag].present?
-    q = q.where(event_type: params[:event_type]) if params[:event_type].present?
-
-    count = q.except(:order, :limit, :offset).count
-    versions =
-        q
-        .order(Arel.sql('material_versions.created_at DESC, material_versions.id DESC'))
-        .limit(limit)
-        .offset(offset)
-
-    render json: { versions: serialise_versions(versions), count: }
-  end
-
-  private
-
-  def serialise_versions rows
-    rows.map do |row|
-      { id: row.id,
-        material_id: row.material_id,
-        version_no: row.version_no,
-        event_type: row.event_type,
-        tag_id: row.tag_id,
-        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,
-        file_byte_size: row.file_byte_size,
-        file_sha256: row.file_sha256,
-        export_paths_json: row.export_paths_hash,
-        discarded_at: row.discarded_at,
-        created_by_user: row.created_by_user&.as_json(UserRepr::BASE),
-        created_at: row.created_at }
-    end
-  end
-end

backend/app/controllers/materials_controller.rb

@@ -1,11 +1,4 @@
-require 'set'
-
-
 class MaterialsController < ApplicationController
-  rescue_from MaterialZipExporter::EmptyExportError, with: :render_zip_empty
-  rescue_from MaterialZipExporter::DuplicatePathError, with: :render_zip_duplicate_path
-  rescue_from MaterialZipExporter::MissingFileError, with: :render_zip_missing_file
-
   def index
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
@@ -15,98 +8,54 @@ class MaterialsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    filters = material_index_filters
+    tag_id = params[:tag_id].presence
-    tag_graph = material_index_tag_graph(filters)
+    parent_id = params[:parent_id].presence
-    q = Material.includes(:material_export_items,
-                          thumbnail_attachment: :blob,
-                          file_attachment: :blob,
-                          tag: :tag_name)
-    q = q.where(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]
-    q = q.where('materials.updated_at <= ?', filters[:updated_to]) if filters[:updated_to]
 
-    q = material_index_join_tag_name(q) if material_index_needs_tag_name?(filters)
+    q = Material.includes(:tag, :created_by_user).with_attached_file
-    q = material_index_join_file_blob(q) if material_index_needs_file_blob?(filters)
+    q = q.where(tag_id:) if tag_id
-    q = apply_material_query(q, filters[:q]) if filters[:q].present?
+    q = q.where(parent_id:) if parent_id
-    q = apply_material_media_kind(q, filters[:media_kind])
 
-    count = q.distinct.count(:id)
+    count = q.count
-    materials =
+    materials = q.order(created_at: :desc, id: :desc).limit(limit).offset(offset)
-        q
-        .order(Arel.sql(material_index_order_sql(filters)))
-        .limit(limit)
-        .offset(offset)
-        .to_a
 
-    response = { materials: MaterialRepr.list_many(materials, host: request.base_url),
+    render json: { materials: MaterialRepr.many(materials, host: request.base_url), count: count }
-                 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
   end
 
   def show
     material =
         Material
-        .includes(:tag, :material_export_items)
+        .includes(:tag)
-        .with_attached_thumbnail
         .with_attached_file
         .find_by(id: params[:id])
     return head :not_found unless material
 
-    wiki_page_body = material.tag&.tag_name&.wiki_page&.current_revision&.body
+    wiki_page_body = material.tag.tag_name.wiki_page&.current_revision&.body
 
     render json: MaterialRepr.base(material, host: request.base_url).merge(wiki_page_body:)
   end
 
   def create
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
 
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
-    file_sha256 = MaterialFileSha256.from_upload(file)
     url = params[:url].to_s.strip.presence
     return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
     if file.blank? && url.blank?
       return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
                                                url: ['ファイルまたは URL は必須です．'] }
     end
-    block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
-    return render_material_import_block(block) if block
 
-    uploaded_blob = build_uploaded_material_blob!(file, file_sha256)
+    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-    material = nil
+    tag = tag_name.tag
+    tag = Tag.create!(tag_name:, category: :material) unless tag
 
-    begin
+    material = Material.new(tag:, url:,
-      Material.transaction do
+                            created_by_user: current_user,
-        tag = resolve_material_tag!(tag_name_raw)
+                            updated_by_user: current_user)
-        material = Material.new(tag:, url:,
+    material.file.attach(file)
-                                created_by_user: current_user,
-                                updated_by_user: current_user)
-        material.file.attach(uploaded_blob) if uploaded_blob
-        material.save!
-        TagVersioning.record_tag_snapshot!(tag, created_by_user: current_user)
-        upsert_export_paths!(material)
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: current_user)
-      end
-    rescue StandardError
-      uploaded_blob&.purge_later
-      raise
-    end
 
-    if material
+    if material.save
-      log_thumbnail_generation(material, MaterialThumbnailGenerator.generate!(material))
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
       render_validation_error material
@@ -122,42 +71,29 @@ class MaterialsController < ApplicationController
 
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
-    file_sha256 = MaterialFileSha256.from_upload(file)
+    url = params[:url].to_s.strip.presence
-    url = params.key?(:url) ? params[:url].to_s.strip.presence : material.url
     return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank? && !material.file.attached?
+    if file.blank? && url.blank?
       return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
                                                url: ['ファイルまたは URL は必須です．'] }
     end
-    block = MaterialImportBlockMatcher.match_for_sha256(file_sha256)
-    return render_material_import_block(block) if block
 
-    uploaded_blob = build_uploaded_material_blob!(file, file_sha256)
+    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
+    tag = tag_name.tag
+    tag = Tag.create!(tag_name:, category: :material) unless tag
 
-    begin
+    material.update!(tag:, url:, updated_by_user: current_user)
-      Material.transaction do
+    if file
-        MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
+      material.file.attach(file)
-        tag = resolve_material_tag!(tag_name_raw)
+    else
-        material.assign_attributes(tag:, url:, updated_by_user: current_user)
+      material.file.purge
-        if uploaded_blob
-          material.file.attach(uploaded_blob)
-        elsif params.key?(:url) && url.present? && file.blank?
-          material.file.detach
-        end
-        material.save!
-        TagVersioning.record_tag_snapshot!(tag, created_by_user: current_user)
-        upsert_export_paths!(material)
-        MaterialVersionRecorder.record!(material:, event_type: :update,
-                                        created_by_user: current_user)
-      end
-    rescue StandardError
-      uploaded_blob&.purge_later
-      raise
     end
 
-    log_thumbnail_generation(material, MaterialThumbnailGenerator.generate!(material))
+    if material.save
-
+      render json: MaterialRepr.base(material, host: request.base_url)
-    render json: MaterialRepr.base(material, host: request.base_url)
+    else
+      render_validation_error material
+    end
   end
 
   def destroy
@@ -167,381 +103,7 @@ class MaterialsController < ApplicationController
     material = Material.find_by(id: params[:id])
     return head :not_found unless material
 
-    Material.transaction do
+    material.discard
-      MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: current_user)
-      material.discard!
-      MaterialVersionRecorder.record!(material:, event_type: :discard,
-                                      created_by_user: current_user)
-    end
     head :no_content
   end
-
-  def download
-    zip = MaterialZipExporter.new(profile: params[:profile],
-                                  tag_id: params[:tag_id]).export
-    profile = params[:profile].presence || 'legacy_drive'
-    send_data zip,
-              type: 'application/zip',
-              disposition: 'attachment',
-              filename: "btrc-materials-#{ profile }.zip"
-  end
-
-  private
-
-  def material_index_filters
-    tag_state = params[:tag_state].to_s.presence
-    tag_state = 'untagged' if bool?(:unclassified)
-    tag_state = 'all' unless ['all', 'tagged', 'untagged'].include?(tag_state)
-
-    media_kind = params[:media_kind].to_s.presence
-    unless ['all', 'image', 'video', 'audio', 'file_other', 'url_only'].include?(media_kind)
-      media_kind = 'all'
-    end
-
-    sort = params[:sort].to_s.presence
-    unless ['created_at', 'updated_at', 'tag_name', 'media_kind', 'file_byte_size',
-            'version_no', 'id'].include?(sort)
-      sort = 'created_at'
-    end
-
-    direction = params[:direction].to_s.downcase
-    direction = 'desc' unless ['asc', 'desc'].include?(direction)
-
-    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),
-      updated_to: parse_time_param(:updated_to),
-      sort:,
-      direction: }
-  end
-
-  def parse_time_param name
-    value = params[name].to_s.strip
-    return nil if value.blank?
-
-    Time.zone.parse(value)
-  rescue ArgumentError
-    nil
-  end
-
-  def resolve_material_tag! tag_name_raw
-    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-    tag = tag_name.tag
-    tag || Tag.create!(tag_name:, category: :material)
-  end
-
-  def material_index_needs_tag_name? filters
-    filters[:q].present? || filters[:sort] == 'tag_name'
-  end
-
-  def material_index_needs_file_blob? filters
-    filters[:q].present? ||
-        filters[:media_kind] != 'all' ||
-        ['media_kind', 'file_byte_size'].include?(filters[:sort])
-  end
-
-  def material_index_join_tag_name q
-    q.left_joins(tag: :tag_name)
-  end
-
-  def material_index_join_file_blob q
-    q.joins(<<~SQL.squish)
-      LEFT JOIN active_storage_attachments material_file_attachments
-        ON material_file_attachments.record_type = 'Material'
-       AND material_file_attachments.record_id = materials.id
-       AND material_file_attachments.name = 'file'
-      LEFT JOIN active_storage_blobs material_file_blobs
-        ON material_file_blobs.id = material_file_attachments.blob_id
-    SQL
-  end
-
-  def apply_material_query q, term
-    like = "%#{ ActiveRecord::Base.sanitize_sql_like(term) }%"
-    q.where('tag_names.name LIKE :q OR materials.url LIKE :q OR ' \
-            'material_file_blobs.filename LIKE :q',
-            q: like)
-  end
-
-  def apply_material_media_kind q, media_kind
-    case media_kind
-    when 'image'
-      q.where('material_file_blobs.content_type LIKE ?', 'image/%')
-    when 'video'
-      q.where('material_file_blobs.content_type LIKE ?', 'video/%')
-    when 'audio'
-      q.where('material_file_blobs.content_type LIKE ?', 'audio/%')
-    when 'file_other'
-      q.where('material_file_attachments.id IS NOT NULL')
-       .where.not('material_file_blobs.content_type LIKE ?', 'image/%')
-       .where.not('material_file_blobs.content_type LIKE ?', 'video/%')
-       .where.not('material_file_blobs.content_type LIKE ?', 'audio/%')
-    when 'url_only'
-      q.where('material_file_attachments.id IS NULL').where.not(url: [nil, ''])
-    else
-      q
-    end
-  end
-
-  def 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 =
-        case filters[:sort]
-        when 'tag_name'
-          'tag_names.name'
-        when 'media_kind'
-          material_media_kind_sql
-        when 'file_byte_size'
-          'material_file_blobs.byte_size'
-        when 'updated_at'
-          'materials.updated_at'
-        when 'version_no'
-          'materials.version_no'
-        when 'id'
-          'materials.id'
-        else
-          'materials.created_at'
-        end
-
-    "#{ sort_sql } #{ direction }, materials.id #{ direction }"
-  end
-
-  def material_media_kind_sql
-    "CASE " \
-      "WHEN material_file_attachments.id IS NULL AND materials.url IS NOT NULL THEN 5 " \
-      "WHEN material_file_blobs.content_type LIKE 'image/%' THEN 1 " \
-      "WHEN material_file_blobs.content_type LIKE 'video/%' THEN 2 " \
-      "WHEN material_file_blobs.content_type LIKE 'audio/%' THEN 3 " \
-      "WHEN material_file_attachments.id IS NOT NULL THEN 4 " \
-      "ELSE 6 END"
-  end
-
-  def upsert_export_paths! material
-    raw = params[:export_paths]
-    return if raw.blank?
-
-    export_paths = raw.respond_to?(:to_unsafe_h) ? raw.to_unsafe_h : raw.to_h
-    export_paths.each do |profile, export_path|
-      profile = profile.to_s
-      export_path = export_path.to_s.strip
-      item = material.material_export_items.find_or_initialize_by(profile:)
-
-      if export_path.blank?
-        item.destroy! if item.persisted?
-        next
-      end
-
-      item.export_path = export_path
-      item.enabled = true
-      item.created_by_user ||= current_user
-      item.save!
-    end
-  end
-
-  def render_zip_empty
-    render_unprocessable_entity('ZIP export 対象の素材がありません．')
-  end
-
-  def render_zip_duplicate_path error
-    render_unprocessable_entity("ZIP export path が重複してゐます: #{ error.message }")
-  end
-
-  def render_zip_missing_file error
-    missing_files = error.missing_files.map do |missing_file|
-      { material_id: missing_file.material_id,
-        export_path: missing_file.export_path,
-        blob_id: missing_file.blob_id,
-        filename: missing_file.filename }
-    end
-
-    render json: { type: 'validation_error',
-                   message: 'ZIP export に必要な素材ファイルが欠損しています．',
-                   errors: { },
-                   base_errors: ['ZIP export に必要な素材ファイルが欠損しています．'],
-                   missing_files: },
-           status: :unprocessable_entity
-  end
-
-  def build_uploaded_material_blob! file, file_sha256
-    return nil unless file
-
-    file.tempfile.rewind
-
-    blob = ActiveStorage::Blob.create_and_upload!(
-        io: file.tempfile,
-        filename: file.original_filename,
-        content_type: file.content_type,
-    )
-
-    MaterialFileSha256.assign_metadata_sha256!(blob, file_sha256)
-
-    blob
-  ensure
-    file.tempfile.rewind if file&.tempfile
-  end
-
-  def render_material_import_block block
-    render_validation_error fields: { file: ["抑止された素材です: #{ block.reason }"] }
-  end
-
-  def log_thumbnail_generation material, result
-    material.reload
-    Rails.logger.info(
-        "Material thumbnail generation: material_id=#{ material.id } " \
-        "result=#{ result } " \
-        "thumbnail_attached=#{ material.thumbnail.attached? } " \
-        "content_type=#{ material.content_type }")
-  end
 end

backend/app/controllers/post_imports_controller.rb

@@ -1,44 +0,0 @@
-class PostImportsController < ApplicationController
-  before_action :require_member!
-
-  def preview
-    rows = PostImportPreviewer.new.preview_rows(
-        rows: PostImportUrlListParser.parse(params[:source]))
-    render json: { rows: }
-  rescue ArgumentError => e
-    render_bad_request e.message
-  end
-
-  def validate
-    rows = normalised_import_rows allow_warning_fields: true
-    changed_row = Integer(params[:changed_row], exception: false)
-    result =
-        PostImportPreviewer.new.preview_rows(rows:,
-                                             fetch_metadata: changed_row,
-                                             metadata_cache: { })
-    render json: { rows: result }
-  rescue ArgumentError => e
-    render_bad_request e.message
-  end
-
-  def create
-    result = PostImportRunner.new(actor: current_user,
-                                  rows: normalised_import_rows).run
-    render json: result, status: result[:created].positive? ? :created : :ok
-  rescue ArgumentError => e
-    render_bad_request e.message
-  end
-
-  private
-
-  def require_member!
-    return head :unauthorized unless current_user
-    return if current_user.gte_member?
-
-    head :forbidden
-  end
-
-  def normalised_import_rows allow_warning_fields: false
-    PostImportRowNormaliser.normalise!(params[:rows], allow_warning_fields:)
-  end
-end

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,
+                 tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-                                    { tag: [: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,
+                                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-                                                     { tag: [: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,
+                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-                                     { tag: [:deerjikists, :materials,
-                                             { tag_name: :wiki_page }] }])
         .with_attached_thumbnail
         .find_by(id: params[:id])
     return head :not_found unless post
@@ -135,21 +125,41 @@ 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
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
 
-    post = PostCreator.new(actor: current_user,
+    # TODO: サイトに応じて thumbnail_base 設定
-                           attributes: { title: params[:title], url: params[:url],
+    title = params[:title].presence
-                                         thumbnail: params[:thumbnail], tags: params[:tags],
+    url = params[:url]
-                                         original_created_from: params[:original_created_from],
+    thumbnail = params[:thumbnail]
-                                         original_created_before: params[:original_created_before],
+    tag_names = params[:tags].to_s.split
-                                         parent_post_ids: parse_parent_post_ids,
+    original_created_from = params[:original_created_from]
-                                         video_ms: params[:video_ms],
+    original_created_before = params[:original_created_before]
-                                         duration: params[:duration] }).create!
+    parent_post_ids = parse_parent_post_ids
+
+    post = Post.new(title:, url:, thumbnail_base: nil, uploaded_user: current_user,
+                    original_created_from:, original_created_before:)
+    post.thumbnail.attach(thumbnail) if thumbnail.present?
+
+    ApplicationRecord.transaction do
+      post.save!
+
+      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?)
+      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
 
     post.reload
     render json: PostRepr.base(post), status: :created
@@ -157,12 +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 PostCreator::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
@@ -219,8 +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 =
@@ -251,16 +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
@@ -359,7 +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
@@ -378,21 +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
+  def build_tag_tree_for tags
-    post_tags = post.active_post_tags.reject { |post_tag| post_tag.tag.deprecated? }
+    tags = tags.reject(&:deprecated?).to_a
-    tags = post_tags.map(&:tag)
     tag_ids = tags.map(&:id)
 
     implications = TagImplication.where(parent_tag_id: tag_ids, tag_id: tag_ids)
@@ -407,9 +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 = { }
 
@@ -417,10 +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)
@@ -432,7 +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, []) }
@@ -501,7 +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),
@@ -514,7 +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),
@@ -522,41 +505,16 @@ class PostsController < ApplicationController
   end
 
   def editable_tag_names_from_post post
-    post
+    post.tags.not_nico.where(deprecated_at: nil)
-        .post_tags
+        .joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-        .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
   end
 
   def post_incoming_snapshot title:, original_created_from:, original_created_before:,
-                             tag_names:, video_ms_param:, duration_param:, parent_post_ids:
+                             tag_names:, 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)
-
     { 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_names: incoming_tag_names_for_snapshot(tag_names),
-        "#{ tag.name }#{ sections[tag.id].to_a.map { section_literal(_1) }.join }"
-      }.sort,
       parent_post_ids: parent_post_ids.sort }
   end
 
@@ -579,8 +537,11 @@ class PostsController < ApplicationController
     value.to_s
   end
 
-  def section_literal section
+  def incoming_tag_names_for_snapshot raw_tag_names
-    "[#{ Post.ms_to_time(section[0]) }-#{ section[1] ? Post.ms_to_time(section[1]) : '' }]"
+    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:,
@@ -601,8 +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）',
@@ -666,14 +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,
+    editable_tags = Tag.normalise_tags!(snapshot[:tag_names], with_tagme: false,
-                                               deny_deprecated: true,
+                                                               deny_deprecated: true)
-                                               with_sections: true) =>
-        { tags: editable_tags, sections: }
     TagVersioning.record_tag_snapshots!(editable_tags, created_by_user: current_user)
 
     readonly_tags = post.tags.nico.to_a
@@ -681,17 +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
+    sync_post_tags!(post, tags)
-    validate_video_sections!(post.video_ms, sections)
-    post.save!
-    sync_post_tags!(post, tags, sections)
     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])]
@@ -735,44 +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/preview_controller.rb

@@ -1,57 +1,50 @@
 class PreviewController < ApplicationController
-  before_action :require_member!
-
   def title
-    return render_bad_request('URL は必須です．') if params[:url].blank?
+    # TODO: # 既知サイトなら決まったフォーマットで title 取得するやぅに．
+    return head :unauthorized unless current_user
 
-    render json: { title: Preview::ThumbnailFetcher.title(params[:url]) }
+    url = params[:url]
-  rescue Preview::UrlSafety::UnsafeUrl => e
+    return render_bad_request('URL は必須です．') unless url.present?
+
+    unless url.start_with?(/http(s)?:\/\//)
+      url = 'http://' + url
+    end
+
+    html = URI.open(url, open_timeout: 5, read_timeout: 5).read
+    doc = Nokogiri::HTML.parse(html)
+    title = doc.at('title')&.text&.strip
+
+    render json: { title: title }
+  rescue => e
     render_bad_request(e.message)
-  rescue Preview::HttpFetcher::FetchTimeout => e
-    render_preview_error(e.message, :gateway_timeout)
-  rescue Preview::HttpFetcher::ResponseTooLarge => e
-    render_preview_error(e.message, :payload_too_large)
-  rescue Preview::HttpFetcher::FetchFailed => e
-    render_preview_error(e.message, :bad_gateway)
   end
 
   def thumbnail
-    return render_bad_request('URL は必須です．') if params[:url].blank?
+    # TODO: 既知ドメインであれば指定のアドレスからサムネールを取得するやぅにする．
 
-    image = MiniMagick::Image.read(Preview::ThumbnailFetcher.fetch(params[:url]))
-    image.auto_orient
-    image.resize '180x180>'
-    image.format 'png'
-    width, height = image.dimensions
-    raise Preview::ThumbnailFetcher::GenerationFailed, 'サムネール画像の変換に失敗しました．' if width > 180 || height > 180
-
-    send_data image.to_blob, type: 'image/png', disposition: 'inline'
-  rescue Preview::UrlSafety::UnsafeUrl => e
-    render_bad_request(e.message)
-  rescue Preview::HttpFetcher::FetchTimeout => e
-    render_preview_error(e.message, :gateway_timeout)
-  rescue Preview::HttpFetcher::ResponseTooLarge => e
-    render_preview_error(e.message, :payload_too_large)
-  rescue Preview::HttpFetcher::FetchFailed => e
-    render_preview_error(e.message, :bad_gateway)
-  rescue Preview::ThumbnailFetcher::GenerationFailed, MiniMagick::Error => e
-    render_unprocessable_entity(e.message)
-  end
-
-  private
-
-  def require_member!
     return head :unauthorized unless current_user
-    return if current_user.gte_member?
 
-    head :forbidden
+    url = params[:url]
-  end
+    return render_bad_request('URL は必須です．') if url.blank?
 
-  def render_preview_error(message, status)
+    unless url.start_with?(/http(s)?:\/\//)
-    render json: { type: status.to_s,
+      url = 'http://' + url
-                   message:,
+    end
-                   errors: { },
+
-                   base_errors: [message] },
+    path = Rails.root.join('tmp', "thumb_#{ SecureRandom.hex }.png")
-           status:
+    system("node #{ Rails.root }/lib/screenshot.js #{ Shellwords.escape(url) } #{ path }")
+
+    if File.exist?(path)
+      image = MiniMagick::Image.open(path)
+      image.resize '180x180'
+      File.delete(path) rescue nil
+      send_file image.path, type: 'image/png', disposition: 'inline'
+    else
+      render json: { type: 'internal_server_error',
+                     message: 'サムネールを生成できませんでした．',
+                     errors: { },
+                     base_errors: ['サムネールを生成できませんでした．'] },
+             status: :internal_server_error
+    end
   end
 end

backend/app/controllers/tags_controller.rb

@@ -82,9 +82,8 @@ class TagsController < ApplicationController
   def with_depth
     parent_tag_id = params[:parent].to_i
     parent_tag_id = nil if parent_tag_id <= 0
-    material_filter = material_filter_param(default: 'any')
 
-    graph = build_with_depth_graph(material_filter)
+    graph = build_with_depth_graph
 
     tag_ids =
         if parent_tag_id
@@ -93,9 +92,19 @@ class TagsController < ApplicationController
           visible_root_tag_ids(graph)
         end
 
-    render json: tag_ids
+    tags =
-                 .sort_by { |tag_id| graph[:tags_by_id][tag_id][:name] }
+        Tag
-                 .map { |tag_id| with_depth_lightweight_repr(tag_id, graph) }
+        .joins(:tag_name)
+        .includes(:tag_name, :materials, tag_name: :wiki_page)
+        .where(id: tag_ids)
+        .order('tag_names.name')
+        .distinct
+        .to_a
+
+    render json: tags.map { |tag|
+      TagRepr.base(tag).merge(has_children: visible_child_tag_ids(tag.id, graph).present?,
+                              children: [])
+    }
   end
 
   def autocomplete
@@ -220,16 +229,13 @@ class TagsController < ApplicationController
   def materials_by_name
     name = params[:name].to_s.strip
     return render_bad_request('name は必須です．') if name.blank?
-    material_filter = material_filter_param(default: 'any')
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
              .find_by(tag_names: { name: })
     return head :not_found unless tag
 
-    graph = build_with_depth_graph(material_filter)
+    render json: build_tag_children(tag)
-
-    render json: build_tag_children(tag, graph:)
   end
 
   def update_all
@@ -245,7 +251,10 @@ 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 +280,7 @@ 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 +316,6 @@ 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 +327,7 @@ 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)
@@ -341,14 +348,7 @@ class TagsController < ApplicationController
 
   private
 
-  def material_filter_param default:
+  def build_with_depth_graph
-    value = params[:material_filter].to_s.presence
-    return default unless ['present', 'missing', 'any'].include?(value)
-
-    value
-  end
-
-  def build_with_depth_graph material_filter
     children_by_parent_id = Hash.new { |h, k| h[k] = [] }
     parent_ids_by_child_id = Hash.new { |h, k| h[k] = [] }
 
@@ -361,37 +361,23 @@ class TagsController < ApplicationController
                parent_ids_by_child_id.keys +
                Tag.where(category: ['meme', 'character', 'material']).pluck(:id)).uniq
 
-    material_tag_ids = Material.unscoped.kept.where.not(tag_id: nil).distinct.pluck(:tag_id).to_set
+    tags_by_id = Tag.where(id: tag_ids)
-
+                    .pluck(:id, :category, :deprecated_at)
-    tags_by_id = Tag.joins(:tag_name)
+                    .each_with_object({ }) do |(id, category, deprecated_at), h|
-                    .where(id: tag_ids)
+      h[id] = { category:, deprecated: deprecated_at.present? }
-                    .pluck('tags.id', 'tag_names.name', 'tags.category', 'tags.deprecated_at')
-                    .each_with_object({ }) do |(id, name, category, deprecated_at), h|
-      h[id] = { name:, category:, deprecated: deprecated_at.present?,
-                has_material: material_tag_ids.include?(id) }
     end
 
     { children_by_parent_id:, parent_ids_by_child_id:, tags_by_id:,
-      visible_child_tag_ids_by_parent_id: { },
+      visible_child_tag_ids_by_parent_id: { } }
-      visible_subtree_by_tag_id: { },
-      material_filter: }
   end
 
   def visible_root_tag_ids graph
-    root_ids = Set.new
+    graph[:tags_by_id].filter_map do |tag_id, attrs|
-
+      next unless with_depth_visible_tag?(attrs)
-    graph[:tags_by_id].each do |tag_id, attrs|
       next unless visible_root_tag?(tag_id, graph)
-      next unless visible_subtree?(tag_id, graph)
 
-      if attrs[:deprecated]
+      tag_id
-        collect_visible_child_tag_ids(tag_id, graph, root_ids, Set.new)
-      else
-        root_ids << tag_id
-      end
     end
-
-    root_ids.to_a
   end
 
   def visible_root_tag? tag_id, graph
@@ -442,77 +428,25 @@ class TagsController < ApplicationController
       return
     end
 
-    if with_depth_visible_tag?(tag, graph[:material_filter])
+    visible_ids << tag_id if with_depth_visible_tag?(tag)
-      visible_ids << tag_id
-      return
-    end
-
-    visible_ids << tag_id if graph[:children_by_parent_id][tag_id].any? { |child_tag_id|
-      visible_subtree?(child_tag_id, graph)
-    }
   end
 
-  def with_depth_visible_tag? tag, material_filter
+  def with_depth_visible_tag? tag
-    return false unless tag[:category].in?(['meme', 'character', 'material']) && !tag[:deprecated]
+    tag[:category].in?(['meme', 'character', 'material']) && !tag[:deprecated]
-
-    case material_filter
-    when 'present'
-      tag[:has_material]
-    when 'missing'
-      !tag[:has_material]
-    else
-      true
-    end
   end
 
-  def visible_subtree? tag_id, graph
+  def build_tag_children tag
-    cache = graph[:visible_subtree_by_tag_id]
-    return cache[tag_id] if cache.key?(tag_id)
-
-    tag = graph[:tags_by_id][tag_id]
-    return cache[tag_id] = false unless tag
-
-    if tag[:deprecated]
-      return cache[tag_id] =
-                 graph[:children_by_parent_id][tag_id].any? { |child_tag_id|
-                   visible_subtree?(child_tag_id, graph)
-                 }
-    end
-
-    cache[tag_id] =
-        with_depth_visible_tag?(tag, graph[:material_filter]) ||
-        graph[:children_by_parent_id][tag_id].any? { |child_tag_id|
-          visible_subtree?(child_tag_id, graph)
-        }
-  end
-
-  def with_depth_lightweight_repr tag_id, graph
-    tag = graph[:tags_by_id][tag_id]
-
-    { id: tag_id,
-      name: tag[:name],
-      category: tag[:category],
-      deprecated: tag[:deprecated],
-      has_material: tag[:has_material],
-      has_children: visible_child_tag_ids(tag_id, graph).present?,
-      children: [] }
-  end
-
-  def build_tag_children tag, graph: nil
     material = tag.materials.first
-    tag_graph = graph && graph[:tags_by_id][tag.id]
+    file = nil
-    material =
+    content_type = nil
-        nil if tag_graph && !with_depth_visible_tag?(tag_graph, graph[:material_filter])
+    if material&.file&.attached?
-
+      file = rails_storage_proxy_url(material.file, only_path: false)
-    children = tag.children.sort_by(&:name)
+      content_type = material.file.blob.content_type
-    if graph
-      children = children.filter { |child_tag| visible_subtree?(child_tag.id, graph) }
     end
 
     TagRepr.base(tag).merge(
-        children: children.map { build_tag_children(_1, graph:) },
+        children: tag.children.sort_by { _1.name }.map { build_tag_children(_1) },
-        has_material: tag_graph ? tag_graph[:has_material] : material.present?,
+        material: material.as_json&.merge(file:, content_type:))
-        material: material && MaterialRepr.base(material, host: request.base_url))
   end
 
   def record_tag_version! tag, event_type:, created_by_user:, name_changed: false, wiki_page: nil
@@ -534,67 +468,6 @@ 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/controllers/user_settings_controller.rb

@@ -1,61 +0,0 @@
-class UserSettingsController < ApplicationController
-  wrap_parameters false
-
-  def show
-    return head :unauthorized unless current_user
-
-    render json: current_setting.serializable_hash
-  end
-
-  def update
-    return head :unauthorized unless current_user
-
-    raw_attributes = editable_raw_attributes
-    field_errors = validate_raw_attributes(raw_attributes)
-    return render_validation_error fields: field_errors if field_errors.present?
-
-    setting = current_setting
-    setting.assign_attributes(raw_attributes)
-
-    if setting.save
-      render json: setting.serializable_hash, status: :ok
-    else
-      render_validation_error setting
-    end
-  end
-
-  private
-
-  def current_setting
-    Setting.find_or_create_by!(user: current_user) do |setting|
-      setting.assign_attributes(Setting.defaults)
-    end
-  rescue ActiveRecord::RecordNotUnique
-    Setting.find_by!(user: current_user)
-  end
-
-  def editable_raw_attributes
-    request.request_parameters.slice(*Setting::EDITABLE_ATTRIBUTES)
-  end
-
-  def validate_raw_attributes raw_attributes
-    raw_attributes.each_with_object({ }) do |(key, value), errors|
-      next if value_matches_type?(key, value)
-
-      errors[key.to_sym] = ['値の型が不正です．']
-    end
-  end
-
-  def value_matches_type? key, value
-    case Setting::TYPE_BY_ATTRIBUTE.fetch(key)
-    when :string
-      value.is_a?(String)
-    when :integer
-      value.is_a?(Integer)
-    when :boolean
-      value == true || value == false
-    else
-      false
-    end
-  end
-end

backend/app/controllers/user_theme_slots_controller.rb

@@ -1,38 +0,0 @@
-class UserThemeSlotsController < ApplicationController
-  wrap_parameters false
-
-  def index
-    return head :unauthorized unless current_user
-
-    render json: current_user
-                 .theme_slots
-                 .order(:base_theme, :slot_no)
-                 .map { |slot| slot.serializable_hash }
-  end
-
-  def update
-    return head :unauthorized unless current_user
-
-    base_theme = params[:base_theme].to_s
-    slot_no = params[:slot_no].to_i
-    tokens = params[:tokens]
-
-    unless UserThemeSlot::BASE_THEMES.include?(base_theme)
-      return render_validation_error fields: { base_theme: ['値が不正です．'] }
-    end
-    unless UserThemeSlot::SLOT_NOS.include?(slot_no)
-      return render_validation_error fields: { slot_no: ['値が不正です．'] }
-    end
-    unless tokens.is_a?(ActionController::Parameters) || tokens.is_a?(Hash)
-      return render_validation_error fields: { tokens: ['JSON object で指定してください．'] }
-    end
-
-    slot = UserThemeSlot.find_or_initialize_by(user: current_user,
-                                               base_theme:,
-                                               slot_no:)
-    slot.tokens = tokens.is_a?(ActionController::Parameters) ? tokens.to_unsafe_h : tokens
-    slot.save!
-
-    render json: slot.serializable_hash, status: :ok
-  end
-end

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
@@ -13,18 +10,9 @@ class Material < ApplicationRecord
   belongs_to :created_by_user, class_name: 'User', optional: true
   belongs_to :updated_by_user, class_name: 'User', optional: true
 
-  has_many :material_versions, dependent: :destroy
-  has_many :material_export_items, dependent: :destroy
-
   has_one_attached :file, dependent: :purge
-  has_one_attached :thumbnail, dependent: :purge
 
-  before_validation :assign_normalized_source_key
+  validates :tag_id, presence: true, uniqueness: true
-
-  validates :tag_id, uniqueness: true, allow_nil: true
-  validates :source_kind,
-            inclusion: { in: SOURCE_KINDS },
-            allow_blank: true
 
   validate :file_must_be_attached
   validate :tag_must_be_material_category
@@ -35,37 +23,8 @@ class Material < ApplicationRecord
     file.blob.content_type
   end
 
-  def file_byte_size
-    return nil unless file&.attached?
-
-    file.blob.byte_size
-  end
-
-  def file_filename
-    return nil unless file&.attached?
-
-    file.blob.filename.to_s
-  end
-
-  def snapshot_export_paths
-    material_export_items.order(:profile).pluck(:profile, :export_path).to_h
-  end
-
   private
 
-  def assign_normalized_source_key
-    if source_kind.blank?
-      self.normalized_source_key = nil
-      return
-    end
-
-    self.normalized_source_key =
-        MaterialSyncSuppression.normalize_source_key(source_kind:,
-                                                     source_uri:,
-                                                     drive_path: source_path,
-                                                     drive_file_id: source_file_id)
-  end
-
   def file_must_be_attached
     return if url.present? || file.attached?
 

backend/app/models/material_export_item.rb

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

backend/app/models/material_import_block.rb

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

backend/app/models/material_sync_source.rb

@@ -1,45 +0,0 @@
-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 }
-  validates :profile, presence: true, inclusion: { in: MaterialExportItem::VALID_PROFILES }
-  validate :source_value_must_be_present
-
-  scope :enabled, -> { where(enabled: true) }
-
-  def normalized_source_key
-    MaterialSyncSuppression.normalize_source_key(source_kind:,
-                                                 source_uri:,
-                                                 source_path:,
-                                                 source_file_id:)
-  end
-
-  private
-
-  def source_value_must_be_present
-    return if source_value_present?
-
-    errors.add(:base, '同期元を指定してください．')
-  end
-
-  def source_value_present?
-    case source_kind
-    when 'uri'
-      source_uri.present?
-    when 'google_drive_file'
-      source_file_id.present? || source_uri.present?
-    when 'google_drive_path'
-      source_file_id.present? || source_uri.present?
-    when 'legacy_drive_path'
-      source_path.present?
-    else
-      normalized_source_key.present?
-    end
-  end
-end

backend/app/models/material_sync_suppression.rb

@@ -1,105 +0,0 @@
-class MaterialSyncSuppression < ApplicationRecord
-  SOURCE_KINDS = [
-    'uri',
-    'google_drive_path',
-    'google_drive_path_prefix',
-    'google_drive_file',
-    'legacy_drive_path',
-    'legacy_drive_path_prefix'
-  ].freeze
-
-  REASONS = [
-    'copyright_high_risk',
-    'copyright_takedown',
-    'adult_or_sensitive',
-    'personal_information',
-    'malware_or_dangerous_file',
-    'duplicate_or_low_quality',
-    'source_owner_request',
-    'other'
-  ].freeze
-
-  belongs_to :created_by_user, class_name: 'User', optional: true
-
-  before_validation :assign_normalized_source_key
-
-  validates :source_kind, presence: true, inclusion: { in: SOURCE_KINDS }
-  validates :reason, presence: true, inclusion: { in: REASONS }
-  validates :normalized_source_key, presence: true, uniqueness: true
-  validate :source_value_must_be_present
-  validate :drive_path_must_be_safe_relative_path
-
-  def self.normalize_source_key source_kind:,
-                                source_uri: nil,
-                                drive_path: nil,
-                                drive_file_id: nil,
-                                source_path: nil,
-                                source_file_id: nil
-    kind = source_kind.to_s
-    value =
-        case kind
-        when 'uri'
-          source_uri.to_s.strip
-        when 'google_drive_path', 'google_drive_path_prefix',
-             'legacy_drive_path', 'legacy_drive_path_prefix'
-          (source_path || drive_path).to_s.strip.gsub(%r{/+}, '/')
-        when 'google_drive_file'
-          (source_file_id || drive_file_id).to_s.strip
-        else
-          ''
-        end
-
-    return nil if kind.blank? || value.blank?
-
-    "#{ kind }:#{ value }"
-  end
-
-  private
-
-  def assign_normalized_source_key
-    normalize_path_fields!
-    self.normalized_source_key =
-        self.class.normalize_source_key(source_kind:,
-                                        source_uri:,
-                                        drive_path:,
-                                        drive_file_id:)
-  end
-
-  def source_value_must_be_present
-    return if normalized_source_key.present?
-
-    errors.add(:base, '同期元を指定してください．')
-  end
-
-  def drive_path_must_be_safe_relative_path
-    return unless source_kind.in?(
-        ['google_drive_path', 'google_drive_path_prefix',
-         'legacy_drive_path', 'legacy_drive_path_prefix'])
-
-    value = drive_path.to_s
-    return if value.blank?
-
-    if value.start_with?('/') || value.match?(/\A[A-Za-z]:\//)
-      errors.add(:drive_path, '相対 path を指定してください．')
-    end
-    if value.start_with?('My Drive/', 'マイドライブ/')
-      errors.add(:drive_path, '同期元フォルダからの相対 path を指定してください．')
-    end
-    errors.add(:drive_path, 'NUL は使へません．') if value.include?("\0")
-    errors.add(:drive_path, '連続スラッシュは使へません．') if value.include?('//')
-    errors.add(:drive_path, '末尾スラッシュは使へません．') if value.end_with?('/')
-
-    parts = value.split('/')
-    if parts.any? { |part| part.in?(['.', '..']) }
-      errors.add(:drive_path, '. や .. は使へません．')
-    end
-  end
-
-  def normalize_path_fields!
-    return unless source_kind.in?(
-        ['google_drive_path', 'google_drive_path_prefix',
-         'legacy_drive_path', 'legacy_drive_path_prefix'])
-
-    self.drive_path = drive_path.to_s.tr('\\', '/').strip.presence
-  end
-end

backend/app/models/material_version.rb

@@ -1,17 +0,0 @@
-class MaterialVersion < ApplicationRecord
-  EVENT_TYPE_MAP = { create: 'create',
-                     update: 'update',
-                     discard: 'discard',
-                     restore: 'restore' }.freeze
-
-  include VersionRecord
-
-  belongs_to :material
-  belongs_to :tag, optional: true
-  belongs_to :parent, class_name: 'Material', optional: true
-  belongs_to :updated_by_user, class_name: 'User', optional: true
-
-  def export_paths_hash
-    export_paths_json || {}
-  end
-end

backend/app/models/post.rb

@@ -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
 
@@ -57,10 +43,9 @@ class Post < ApplicationRecord
 
   attribute :version_no, :integer, default: 1
 
-  before_validation :normalise_url, if: :will_save_change_to_url?
+  before_validation :normalise_url
 
-  validates :url, presence: true, uniqueness: true, length: { maximum: 768 }
+  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
+  def snapshot_tag_names = tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
-    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_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
@@ -173,6 +128,15 @@ class Post < ApplicationRecord
   def normalise_url
     return if url.blank?
 
-    self.url = PostUrlNormaliser.normalise(url) || url.strip
+    self.url = url.strip
+
+    u = URI.parse(url)
+    return unless u in URI::HTTP
+
+    u.host = u.host.downcase if u.host
+    u.path = u.path.sub(/\/\Z/, '') if u.path.present?
+    self.url = u.to_s
+  rescue URI::InvalidURIError
+    ;
   end
 end

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_url_sanitisation_rule.rb

@@ -1,163 +0,0 @@
-class PostUrlSanitisationRule < ApplicationRecord
-  include Discard::Model
-
-  class InvalidUrlError < StandardError
-    attr_reader :invalid_rows
-
-    def initialize(invalid_rows)
-      @invalid_rows = invalid_rows
-      ids = invalid_rows.map { _1.fetch(:post_id) }.join(', ')
-      super("post URL sanitisation produced invalid URLs for posts #{ ids }")
-    end
-  end
-
-  class UrlConflictError < StandardError
-    attr_reader :conflicts
-
-    def initialize(conflicts)
-      @conflicts = conflicts
-      urls = conflicts.map { _1.fetch(:url) }.uniq.join(', ')
-      super("post URL sanitisation conflicts detected for #{ urls }")
-    end
-  end
-
-  self.primary_key = :priority
-
-  default_scope -> { kept }
-
-  validates :source_pattern, presence: true, uniqueness: true
-
-  validate :source_pattern_must_be_regexp
-
-  class << self
-    def sanitise(url) = sanitise_with_rules(url, rules)
-
-    def apply!
-      rewrites = nil
-
-      Post.transaction do
-        compiled_rules = rules
-
-        rewrites = Post.order(:id)
-                       .lock('FOR UPDATE')
-                       .pluck(:id, :url)
-                       .map do |post_id, original_url|
-          { post_id:,
-            original_url:,
-            sanitised_url: sanitise_with_rules(original_url, compiled_rules) }
-        end
-
-        invalid_rows = rewrites.filter { invalid_sanitised_url?(_1.fetch(:sanitised_url)) }
-                               .map { { post_id: _1.fetch(:post_id),
-                                        original_url: _1.fetch(:original_url),
-                                        sanitised_url: _1.fetch(:sanitised_url) } }
-        raise InvalidUrlError.new(invalid_rows) if invalid_rows.present?
-
-        conflicts = build_conflicts(rewrites)
-        raise UrlConflictError.new(conflicts) if conflicts.present?
-
-        changed = rewrites.filter { _1.fetch(:original_url) != _1.fetch(:sanitised_url) }
-        return if changed.empty?
-
-        token = SecureRandom.hex(6)
-
-        changed.each do |row|
-          Post.where(id: row.fetch(:post_id))
-              .update_all(url: temporary_url_for(row.fetch(:post_id), token))
-        end
-
-        changed.each do |row|
-          Post.where(id: row.fetch(:post_id))
-              .update_all(url: row.fetch(:sanitised_url))
-        end
-      end
-    rescue ActiveRecord::RecordNotUnique => error
-      conflicts = build_persisted_conflicts(rewrites)
-      raise error if conflicts.empty?
-
-      raise UrlConflictError.new(conflicts), cause: error
-    end
-
-    private
-
-    def rules = kept.order(:priority).map { |r| [Regexp.new(r.source_pattern), r.replacement] }
-
-    def sanitise_with_rules(url, compiled_rules)
-      compiled_rules.reduce(url.dup) do |value, (pattern, replacement)|
-        value.sub(pattern, replacement)
-      end
-    end
-
-    def temporary_url_for(post_id, token) =
-        "https://post-url-sanitising.invalid/#{ token }/#{ post_id }"
-
-    def invalid_sanitised_url?(url)
-      return true if url.blank?
-      return true if url.length > 768
-
-      parsed = URI.parse(url)
-      return true if !(parsed in URI::HTTP)
-      return true if parsed.host.blank?
-
-      false
-    rescue URI::InvalidURIError
-      true
-    end
-
-    def build_conflicts(rewrites)
-      rewrites
-          .group_by { _1.fetch(:sanitised_url).downcase }
-          .values
-          .filter { _1.size > 1 }
-          .flatten
-          .map { { url: _1.fetch(:sanitised_url),
-                   post_id: _1.fetch(:post_id),
-                   original_url: _1.fetch(:original_url) } }
-    end
-
-    def build_persisted_conflicts(rewrites)
-      return [] if rewrites.blank?
-
-      target_rows = rewrites.filter { _1.fetch(:original_url) != _1.fetch(:sanitised_url) }
-      target_keys = target_rows.map { _1.fetch(:sanitised_url).downcase }.uniq
-      return [] if target_keys.empty?
-
-      target_pairs = target_rows.to_h do |row|
-        [row.fetch(:post_id), row.fetch(:sanitised_url).downcase]
-      end
-
-      persisted_rows = Post.order(:id)
-                           .where('LOWER(url) IN (?)', target_keys)
-                           .pluck(:id, :url)
-                           .reject { |post_id, original_url| target_pairs[post_id] == original_url.downcase }
-                           .map { |post_id, original_url|
-        { url: original_url,
-          post_id:,
-          original_url:,
-          conflict_key: original_url.downcase }
-      }
-
-      target_conflicts = target_rows.map { { url: _1.fetch(:sanitised_url),
-                                             post_id: _1.fetch(:post_id),
-                                             original_url: _1.fetch(:original_url),
-                                             conflict_key: _1.fetch(:sanitised_url).downcase } }
-
-      (persisted_rows + target_conflicts)
-          .group_by { _1.fetch(:conflict_key) }
-          .values
-          .filter { _1.size > 1 }
-          .flatten
-          .map { _1.except(:conflict_key) }
-    end
-  end
-
-  private
-
-  def source_pattern_must_be_regexp
-    return if source_pattern.blank?
-
-    Regexp.new(source_pattern)
-  rescue RegexpError
-    errors.add :source_pattern, '変な正規表現だね〜（笑）'
-  end
-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/setting.rb

@@ -1,52 +1,7 @@
 class Setting < ApplicationRecord
-  THEMES = ['system', 'light', 'dark'].freeze
-
-  # These remain in the typed settings schema to preserve existing backend
-  # work. The common `/users/settings` page currently surfaces only `theme`.
-  AUTO_FETCH_MODES = ['auto', 'manual', 'off'].freeze
-  WIKI_EDITOR_MODES = ['split', 'write', 'preview'].freeze
-
-  STRING_ATTRIBUTES = [
-    'theme',
-    'auto_fetch_title',
-    'auto_fetch_thumbnail',
-    'wiki_editor_mode',
-  ].freeze
-  INTEGER_ATTRIBUTES = [].freeze
-  BOOLEAN_ATTRIBUTES = [].freeze
-  EDITABLE_ATTRIBUTES =
-      (STRING_ATTRIBUTES + INTEGER_ATTRIBUTES + BOOLEAN_ATTRIBUTES).freeze
-  TYPE_BY_ATTRIBUTE = {
-    'theme' => :string,
-    'auto_fetch_title' => :string,
-    'auto_fetch_thumbnail' => :string,
-    'wiki_editor_mode' => :string,
-  }.freeze
-
   belongs_to :user
 
   validates :user_id, presence: true
-  validates :user_id, uniqueness: true
+  validates :key, presence: true, length: { maximum: 255 }
-
+  validates :value, presence: true
-  validates :theme, inclusion: { in: THEMES }
-  validates :auto_fetch_title, inclusion: { in: AUTO_FETCH_MODES }
-  validates :auto_fetch_thumbnail, inclusion: { in: AUTO_FETCH_MODES }
-  validates :wiki_editor_mode, inclusion: { in: WIKI_EDITOR_MODES }
-
-  def self.defaults
-    {
-      theme: 'system',
-      auto_fetch_title: 'manual',
-      auto_fetch_thumbnail: 'manual',
-      wiki_editor_mode: 'split',
-    }
-  end
-
-  def self.serializable_attributes
-    EDITABLE_ATTRIBUTES.map(&:to_sym)
-  end
-
-  def serializable_hash(options = nil)
-    super({ only: self.class.serializable_attributes }.merge(options || { }))
-  end
 end

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,
+                                      deny_deprecated: false
-                                      with_sections: 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 = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
-      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
-
       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)
+    tags.uniq(&:id)
-
-    if with_sections
-      { tags:, sections: }
-    else
-      tags
-    end
   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/models/user.rb

@@ -7,8 +7,7 @@ class User < ApplicationRecord
 
   has_many :created_posts,
            class_name: 'Post', foreign_key: :uploaded_user_id, dependent: :nullify
-  has_one :setting, dependent: :destroy
+  has_many :settings
-  has_many :theme_slots, class_name: 'UserThemeSlot', dependent: :destroy
   has_many :user_ips, dependent: :destroy
   has_many :ip_addresses, through: :user_ips
   has_many :user_post_views, dependent: :destroy

backend/app/models/user_theme_slot.rb

@@ -1,27 +0,0 @@
-class UserThemeSlot < ApplicationRecord
-  BASE_THEMES = ['light', 'dark'].freeze
-  SLOT_NOS = [1, 2, 3].freeze
-
-  belongs_to :user
-
-  validates :user_id, presence: true
-  validates :base_theme, presence: true, inclusion: { in: BASE_THEMES }
-  validates :slot_no, presence: true, inclusion: { in: SLOT_NOS }
-  validates :tokens, presence: true
-  validates :user_id, uniqueness: { scope: [:base_theme, :slot_no] }
-
-  validate :tokens_must_be_object
-
-  def serializable_hash(options = nil)
-    hash = { only: [:base_theme, :slot_no, :tokens, :created_at, :updated_at] }
-    super(hash.merge(options || {}))
-  end
-
-  private
-
-  def tokens_must_be_object
-    return if tokens.is_a?(Hash)
-
-    errors.add(:tokens, 'は JSON object で指定してください．')
-  end
-end

backend/app/models/version_record.rb

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

backend/app/representations/material_repr.rb

@@ -2,9 +2,7 @@
 
 
 module MaterialRepr
-  BASE = { only: [:id, :url, :version_no, :source_kind, :source_uri,
+  BASE = { only: [:id, :url, :created_at, :updated_at],
-                  :source_path, :source_file_id, :normalized_source_key,
-                  :created_at, :updated_at],
            methods: [:content_type],
            include: { tag: TagRepr::BASE,
                       created_by_user: UserRepr::BASE,
@@ -17,93 +15,10 @@ module MaterialRepr
         file: if material.file.attached?
                 Rails.application.routes.url_helpers.rails_storage_proxy_url(
                     material.file, host:)
-              end,
+              end)
-        thumbnail: thumbnail_url(material, host:),
-        thumbnail_fallback_text: thumbnail_fallback_text(material),
-        thumbnail_fallback_kind: thumbnail_fallback_kind(material),
-        media_kind: media_kind(material),
-        file_byte_size: material.file_byte_size,
-        export_paths: export_paths(material),
-        export_items: export_items(material))
   end
 
   def many materials, host:
     materials.map { |m| base(m, host:) }
   end
-
-  def list material, host:
-    { id: material.id,
-      version_no: material.version_no,
-      url: material.url,
-      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,
-      tag: compact_tag(material.tag),
-      thumbnail: thumbnail_url(material, host:),
-      thumbnail_fallback_text: thumbnail_fallback_text(material),
-      thumbnail_fallback_kind: thumbnail_fallback_kind(material),
-      media_kind: media_kind(material),
-      content_type: material.content_type,
-      file_byte_size: material.file_byte_size,
-      created_at: material.created_at,
-      updated_at: material.updated_at,
-      export_paths: export_paths(material),
-      export_items: export_items(material) }
-  end
-
-  def list_many materials, host:
-    materials.map { |m| list(m, host:) }
-  end
-
-  def export_paths material
-    material.material_export_items.each_with_object({ }) do |item, hash|
-      hash[item.profile] = item.enabled ? item.export_path : ''
-    end
-  end
-
-  def export_items material
-    material.material_export_items.map do |item|
-      { id: item.id,
-        profile: item.profile,
-        export_path: item.export_path,
-        enabled: item.enabled }
-    end
-  end
-
-  def thumbnail_url material, host:
-    return nil unless material.thumbnail.attached?
-
-    Rails.application.routes.url_helpers.rails_storage_proxy_url(
-        material.thumbnail, host:)
-  end
-
-  def thumbnail_fallback_text material
-    material.tag&.name || material.created_at&.strftime('%Y-%m-%d')
-  end
-
-  def thumbnail_fallback_kind material
-    material.tag.present? ? 'tag_name' : 'created_at'
-  end
-
-  def media_kind material
-    return 'url_only' unless material.file.attached?
-
-    content_type = material.file.blob.content_type.to_s
-    return 'image' if content_type.start_with?('image/')
-    return 'video' if content_type.start_with?('video/')
-    return 'audio' if content_type.start_with?('audio/')
-
-    'file_other'
-  end
-
-  def compact_tag tag
-    return nil unless tag
-
-    { id: tag.id,
-      name: tag.name,
-      category: tag.category,
-      deprecated_at: tag.deprecated_at }
-  end
 end

backend/app/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
+  def tag_json tags
-    post
+    tags.reject(&:deprecated?).map { |tag| TagRepr.inline(tag) }
-        .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]))
-    }
   end
 
   def thumbnail_url post

backend/app/services/google_drive/api_client.rb

@@ -1,233 +0,0 @@
-require 'json'
-require 'jwt'
-require 'net/http'
-require 'openssl'
-require 'tempfile'
-require 'uri'
-
-
-module GoogleDrive
-  class ApiClient
-    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'],
-                   private_key: ENV['GOOGLE_DRIVE_PRIVATE_KEY'],
-                   private_key_path: ENV['GOOGLE_DRIVE_PRIVATE_KEY_PATH'],
-                   subject: ENV['GOOGLE_DRIVE_SUBJECT']
-      @service_account_email = service_account_email.to_s
-      @private_key = load_private_key(private_key, private_key_path)
-      @subject = subject.to_s.presence
-      @access_token = nil
-    end
-
-    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)
-      end
-    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)
-      end
-      tempfile.rewind
-      tempfile
-    rescue StandardError
-      tempfile&.close!
-      raise
-    end
-
-    def extract_file_id value
-      raw = value.to_s.strip
-      return nil if raw.blank?
-      return raw unless raw.include?('/')
-
-      uri = URI.parse(raw)
-      return uri.query.to_s[%r{(?:^|&)id=([^&]+)}, 1] if uri.query.present?
-      return uri.path[%r{/folders/([^/]+)}, 1] if uri.path.include?('/folders/')
-
-      uri.path[%r{/d/([^/]+)}, 1]
-    rescue URI::InvalidURIError
-      nil
-    end
-
-    private
-
-    def walk_folder folder_id, prefix, &block
-      list_children(folder_id).each do |entry|
-        relative_path = MaterialSyncExportPath.build(prefix:,
-                                                     relative_path: entry['name'])
-        if entry['mimeType'] == FOLDER_MIME_TYPE
-          walk_folder(entry['id'], relative_path, &block)
-          next
-        end
-
-        block.call(entry, relative_path)
-      end
-    end
-
-    def build_file_entry entry, relative_path
-      { id: entry['id'],
-        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
-
-    def list_children folder_id
-      files = []
-      page_token = nil
-
-      loop do
-        response =
-            request_json('/files', {
-                q: "'#{ folder_id }' in parents and trashed = false",
-                fields: 'nextPageToken,files(id,name,mimeType,sha256Checksum,' \
-                        'webViewLink,webContentLink)',
-                orderBy: 'folder,name',
-                pageSize: 1000,
-                supportsAllDrives: true,
-                includeItemsFromAllDrives: true,
-                pageToken: page_token }.compact)
-        files.concat(response.fetch('files'))
-        page_token = response['nextPageToken']
-        break if page_token.blank?
-      end
-
-      files
-    end
-
-    def get_file file_id
-      request_json("/files/#{ file_id }",
-                   fields: 'id,name,mimeType,sha256Checksum,webViewLink,webContentLink',
-                   supportsAllDrives: true)
-    end
-
-    def request_json path, params = {}
-      response = request(:get, path, params:)
-      unless response.is_a?(Net::HTTPSuccess)
-        raise "Google Drive API error: #{ response.code } #{ response.body }"
-      end
-
-      JSON.parse(response.body)
-    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.read_body do |chunk|
-          yield chunk.b
-        end
-      end
-    end
-
-    def request method, path, params: nil
-      uri = URI(DRIVE_ENDPOINT + path)
-      uri.query = URI.encode_www_form(params) if params.present?
-
-      klass =
-          case method
-          when :get
-            Net::HTTP::Get
-          else
-            raise ArgumentError, "Unsupported Google Drive request method: #{ method }"
-          end
-      request = klass.new(uri)
-      request['Authorization'] = "Bearer #{ access_token }"
-
-      Net::HTTP.start(uri.host,
-                      uri.port,
-                      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
-      end
-    end
-
-    def access_token
-      @access_token ||= fetch_access_token
-    end
-
-    def fetch_access_token
-      raise 'GOOGLE_DRIVE_SERVICE_ACCOUNT_EMAIL is required' if @service_account_email.blank?
-      raise 'Google Drive private key is required' if @private_key.blank?
-
-      payload = { iss: @service_account_email,
-                  scope: DRIVE_SCOPE,
-                  aud: TOKEN_ENDPOINT,
-                  exp: 1.hour.from_now.to_i,
-                  iat: Time.current.to_i }
-      payload[:sub] = @subject if @subject.present?
-
-      assertion = JWT.encode(payload, @private_key, 'RS256')
-      uri = URI(TOKEN_ENDPOINT)
-      request = Net::HTTP::Post.new(uri)
-      request.set_form_data(
-          grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
-          assertion:)
-
-      response =
-          Net::HTTP.start(uri.host,
-                          uri.port,
-                          use_ssl: true,
-                          open_timeout: 10,
-                          read_timeout: 30) do |http|
-            http.request(request)
-          end
-      unless response.is_a?(Net::HTTPSuccess)
-        raise "Google OAuth error: #{ response.code } #{ response.body }"
-      end
-
-      JSON.parse(response.body).fetch('access_token')
-    end
-
-    def load_private_key private_key, private_key_path
-      raw = private_key.to_s
-      raw = raw.gsub('\n', "\n") if raw.present?
-      raw = File.read(private_key_path) if raw.blank? && private_key_path.present?
-      return nil if raw.blank?
-
-      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

@@ -1,57 +0,0 @@
-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)
-    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)
-        sha256
-      end
-    rescue ActiveStorage::FileNotFoundError, ArgumentError => error
-      Rails.logger.warn(
-          "MaterialFileSha256.from_blob failed for blob_id=#{blob.id}: " \
-          "#{error.class}: #{error.message}",
-      )
-      nil
-    end
-  end
-
-  def self.from_upload upload
-    tempfile = upload&.tempfile
-    return nil unless tempfile
-
-    tempfile.rewind
-    Digest::SHA256.file(tempfile.path).hexdigest.tap do
-      tempfile.rewind
-    end
-  end
-end

backend/app/services/material_import_block_matcher.rb

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

backend/app/services/material_sync_export_path.rb

@@ -1,56 +0,0 @@
-class MaterialSyncExportPath
-  class << self
-    def build prefix: nil, relative_path: nil, filename: nil, source_file_id: nil
-      path = normalize_path(relative_path)
-      path = fallback_filename(filename, source_file_id) if path.blank?
-
-      normalized_prefix = normalize_path(prefix)
-      return path if normalized_prefix.blank?
-      return normalized_prefix if path.blank?
-
-      [normalized_prefix, path].join('/')
-    end
-
-    def normalize_path path
-      raw = path.to_s.delete("\0").tr('\\', '/').strip
-      raw = raw.sub(%r{\A[A-Za-z]:/+}, '')
-      raw = raw.sub(%r{\A/+}, '')
-      return nil if raw.blank?
-
-      segments = raw.split('/').filter_map do |segment|
-        normalized = normalize_segment(segment)
-        normalized.presence
-      end
-      return nil if segments.empty?
-
-      segments.join('/')
-    end
-
-    def uniquify path, source_file_id
-      normalized = normalize_path(path)
-      return normalized if normalized.blank? || source_file_id.blank?
-
-      ext = File.extname(normalized)
-      base = ext.present? ? normalized.delete_suffix(ext) : normalized
-      "#{ base }--#{ source_file_id }#{ ext }"
-    end
-
-    private
-
-    def fallback_filename filename, source_file_id
-      name = normalize_path(filename)
-      return name if name.present?
-      return nil if source_file_id.blank?
-
-      source_file_id.to_s
-    end
-
-    def normalize_segment segment
-      cleaned = segment.to_s.delete("\0").tr('\\/', '_').strip
-      return nil if cleaned.blank? || cleaned == '.'
-      return '__' if cleaned == '..'
-
-      cleaned
-    end
-  end
-end

backend/app/services/material_sync_importer.rb

@@ -1,259 +0,0 @@
-require 'digest'
-
-class MaterialSyncImporter
-  Result = Struct.new(:material, :action, :suppressed, :suppression, keyword_init: true)
-
-  def self.import! attributes
-    new(attributes).import!
-  end
-
-  def initialize attributes
-    @attributes = attributes
-  end
-
-  def import!
-    source = source_attributes
-    key = normalized_source_key(source)
-    raise ArgumentError, 'normalized_source_key is required for material sync' if key.blank?
-
-    suppression = suppression_for(source)
-    if suppression
-      return Result.new(material: nil,
-                        action: :suppressed,
-                        suppressed: true,
-                        suppression:)
-    end
-
-    material =
-        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
-        elsif material.discarded?
-          :restore
-        else
-          :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.discarded_at = nil if material.respond_to?(:discarded_at=)
-      material.file.attach(uploaded_blob) if uploaded_blob
-      material.save!
-      upsert_export_item!(material)
-      MaterialVersionRecorder.record!(material:,
-                                      event_type:,
-                                      created_by_user: @attributes[:updated_by_user])
-    end
-    MaterialThumbnailGenerator.generate!(material)
-
-    Result.new(material:,
-               action: event_type == :create ? :imported : :updated,
-               suppressed: false,
-               suppression: nil)
-  rescue StandardError
-    uploaded_blob&.purge_later
-    raise
-  ensure
-    close_tempfile!
-  end
-
-  private
-
-  def source_attributes
-    { source_kind: @attributes[:source_kind],
-      source_uri: @attributes[:source_uri],
-      source_path: @attributes[:source_path],
-      source_file_id: @attributes[:source_file_id] }
-  end
-
-  def normalized_source_key source
-    MaterialSyncSuppression.normalize_source_key(source_kind: source[:source_kind],
-                                                 source_uri: source[:source_uri],
-                                                 source_path: source[:source_path],
-                                                 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
-  end
-
-  def suppression_for source
-    if source[:source_kind] == 'google_drive_file' && source[:source_path].present?
-      return MaterialSyncSuppressionMatcher.match_google_drive_candidate(
-          drive_file_id: source[:source_file_id],
-          relative_path: source[:source_path])
-    end
-
-    MaterialSyncSuppressionMatcher.match(**source)
-  end
-
-  def uploaded_blob!
-    return @attributes[:file_blob] if @attributes[:file_blob]
-
-    tempfile = upload_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)
-    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)
-    return if export_path.blank?
-
-    item = material.material_export_items.find_or_initialize_by(profile: effective_profile)
-    item.export_path = export_path
-    item.enabled = true
-    item.created_by_user ||= @attributes[:created_by_user]
-    item.save!
-  end
-
-  def export_path_taken_by_other? material, profile, export_path
-    MaterialExportItem
-      .where(profile:, export_path:)
-      .where.not(material_id: material.id)
-      .exists?
-  end
-
-  def close_tempfile!
-    tempfile = upload_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

@@ -1,251 +0,0 @@
-class MaterialSyncRunner
-  Result = Struct.new(:imported, :updated, :unchanged, :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))
-  end
-
-  def initialize source
-    @source = source
-  end
-
-  def sync!
-    result = Result.new(imported: 0, updated: 0, unchanged: 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
-    end
-
-    @source.update!(last_synced_at: Time.current)
-    log_result(result)
-    result
-  rescue NotImplementedError, StandardError => e
-    result.failed += 1
-    result.errors << { source_id: @source.id, error: e.message }
-    log_result(result)
-    result
-  end
-
-  private
-
-  def candidates
-    case @source.source_kind
-    when 'uri'
-      [uri_candidate]
-    when 'google_drive_file'
-      [google_drive_file_candidate]
-    when 'legacy_drive_path'
-      raise NotImplementedError, 'legacy_drive_path material sync is not implemented'
-    else
-      raise NotImplementedError, "Unsupported material sync source_kind: #{ @source.source_kind }"
-    end
-  end
-
-  def uri_candidate
-    { source_kind: @source.source_kind,
-      source_uri: @source.source_uri,
-      source_path: @source.source_path,
-      source_file_id: @source.source_file_id,
-      url: @source.source_uri,
-      tag: nil,
-      created_by_user: @source.created_by_user,
-      updated_by_user: @source.updated_by_user || @source.created_by_user }
-  end
-
-  def sync_candidate! candidate, result
-    block = MaterialImportBlockMatcher.match_for_sha256(candidate[:file_sha256])
-    if block
-      result.suppressed += 1
-      Rails.logger.info(
-          material_sync_log(action: 'suppressed',
-                            reason: block.reason,
-                            normalized_source_key: candidate_normalized_source_key(candidate)))
-      return
-    end
-
-    suppression = suppression_for(candidate)
-
-    if suppression
-      result.suppressed += 1
-      Rails.logger.info(
-          material_sync_log(action: 'suppressed',
-                            normalized_source_key: suppression.normalized_source_key))
-      return
-    end
-
-    import = MaterialSyncImporter.import!(candidate)
-    result.public_send("#{ import.action }=", result.public_send(import.action) + 1)
-  rescue StandardError => e
-    result.failed += 1
-    result.errors << { source_id: @source.id,
-                       normalized_source_key: candidate_normalized_source_key(candidate),
-                       error: e.message }
-    Rails.logger.warn(
-        material_sync_log(action: 'failed',
-                          error: e.message,
-                          normalized_source_key: candidate_normalized_source_key(candidate)))
-  ensure
-    close_candidate_tempfile(candidate)
-  end
-
-  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|
-        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)
-  end
-
-  def build_google_drive_candidate entry, single_file: false
-    relative_path =
-        if single_file
-          nil
-        else
-          entry[:relative_path]
-        end
-    export_path =
-        MaterialSyncExportPath.build(prefix: @source.export_path_prefix,
-                                     relative_path:,
-                                     filename: entry[:name],
-                                     source_file_id: entry[:id])
-
-    { source_kind: 'google_drive_file',
-      source_uri: entry[:web_view_link] || google_drive_file_url(entry[:id]),
-      source_path: relative_path.presence || MaterialSyncExportPath.normalize_path(entry[:name]),
-      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],
-      export_path:,
-      profile: @source.profile,
-      tag: nil,
-      url: nil,
-      created_by_user: @source.created_by_user,
-      updated_by_user: @source.updated_by_user || @source.created_by_user }
-  end
-
-  def candidate_normalized_source_key candidate
-    MaterialSyncSuppression.normalize_source_key(source_kind: candidate[:source_kind],
-                                                 source_uri: candidate[:source_uri],
-                                                 source_path: candidate[:source_path],
-                                                 source_file_id: candidate[:source_file_id])
-  end
-
-  def suppression_for candidate
-    if candidate[:source_kind] == 'google_drive_file' && candidate[:source_path].present?
-      return MaterialSyncSuppressionMatcher.match_google_drive_candidate(
-          drive_file_id: candidate[:source_file_id],
-          relative_path: candidate[:source_path])
-    end
-
-    MaterialSyncSuppressionMatcher.match(source_kind: candidate[:source_kind],
-                                         source_uri: candidate[:source_uri],
-                                         source_path: candidate[:source_path],
-                                         source_file_id: candidate[:source_file_id])
-  end
-
-  def drive_client
-    @drive_client ||= GoogleDrive::ApiClient.new
-  end
-
-  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
-    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
-    end
-  end
-
-  def google_drive_target_id
-    @source.source_file_id.presence || drive_client.extract_file_id(@source.source_uri)
-  end
-
-  def google_drive_file_url file_id
-    "https://drive.google.com/file/d/#{ file_id }/view"
-  end
-
-  def close_candidate_tempfile candidate
-    tempfile = candidate[:file_tempfile]
-    return unless tempfile
-
-    tempfile.close! unless tempfile.closed?
-  rescue StandardError
-    nil
-  end
-
-  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
-  end
-end

backend/app/services/material_sync_suppression_matcher.rb

@@ -1,68 +0,0 @@
-class MaterialSyncSuppressionMatcher
-  def self.match source_kind:,
-                 source_uri: nil,
-                 drive_path: nil,
-                 drive_file_id: nil,
-                 source_path: nil,
-                 source_file_id: nil
-    key = MaterialSyncSuppression.normalize_source_key(source_kind:,
-                                                       source_uri:,
-                                                       drive_path:,
-                                                       drive_file_id:,
-                                                       source_path:,
-                                                       source_file_id:)
-    return nil if key.blank?
-
-    MaterialSyncSuppression.find_by(normalized_source_key: key)
-  end
-
-  def self.match_google_drive_candidate drive_file_id:, relative_path:
-    normalized_path = validate_relative_path!(relative_path)
-
-    exact = [
-      normalize_key('google_drive_file', drive_file_id),
-      normalize_key('google_drive_path', normalized_path),
-      normalize_key('legacy_drive_path', normalized_path),
-    ].compact
-
-    suppression =
-        MaterialSyncSuppression.find_by(normalized_source_key: exact)
-    return suppression if suppression
-
-    MaterialSyncSuppression
-      .where(source_kind: ['google_drive_path_prefix', 'legacy_drive_path_prefix'])
-      .where('drive_path = :path OR :path LIKE CONCAT(drive_path, "/%")', path: normalized_path)
-      .order(:id)
-      .first
-  end
-
-  def self.suppressed?(...)
-    match(...).present?
-  end
-
-  def self.validate_relative_path! relative_path
-    raw = relative_path.to_s.delete("\0").tr('\\', '/').strip
-    raise ArgumentError, 'relative_path is required' if raw.blank?
-    raise ArgumentError, 'relative_path must be relative' if raw.start_with?('/')
-    raise ArgumentError, 'relative_path must be relative' if raw.match?(/\A[A-Za-z]:\//)
-    if raw.start_with?('My Drive/', 'マイドライブ/')
-      raise ArgumentError, 'relative_path must be relative to source folder'
-    end
-    raise ArgumentError, 'relative_path must not contain //' if raw.include?('//')
-    raise ArgumentError, 'relative_path must not end with /' if raw.end_with?('/')
-
-    parts = raw.split('/')
-    if parts.any? { |part| part.in?(['.', '..']) }
-      raise ArgumentError, 'relative_path must not contain dot segments'
-    end
-
-    raw
-  end
-
-  def self.normalize_key source_kind, value
-    return nil if value.blank?
-
-    MaterialSyncSuppression.normalize_source_key(source_kind:, source_path: value,
-                                                 source_file_id: value)
-  end
-end

backend/app/services/material_sync_suppression_registrar.rb

@@ -1,51 +0,0 @@
-class MaterialSyncSuppressionRegistrar
-  def self.create! attributes, created_by_user:
-    new(attributes, created_by_user:).create!
-  end
-
-  def initialize attributes, created_by_user:
-    @attributes = attributes
-    @created_by_user = created_by_user
-  end
-
-  def create!
-    suppression = nil
-
-    MaterialSyncSuppression.transaction do
-      suppression = MaterialSyncSuppression.create!(
-          @attributes.merge(created_by_user: @created_by_user))
-      discard_existing_materials!(suppression)
-    end
-
-    suppression
-  end
-
-  private
-
-  def discard_existing_materials! suppression
-    matching_materials(suppression).find_each do |material|
-      MaterialVersionRecorder.ensure_snapshot!(material, created_by_user: @created_by_user)
-      material.discard!
-      MaterialVersionRecorder.record!(material:,
-                                      event_type: :discard,
-                                      created_by_user: @created_by_user)
-    end
-  end
-
-  def matching_materials suppression
-    materials = Material.unscoped.kept
-
-    case suppression.source_kind
-    when 'google_drive_path', 'legacy_drive_path'
-      materials.where(source_path: suppression.drive_path)
-    when 'google_drive_path_prefix', 'legacy_drive_path_prefix'
-      path = suppression.drive_path.to_s
-      materials.where(
-          'source_path = :path OR source_path LIKE :prefix',
-          path:,
-          prefix: "#{ path }/%")
-    else
-      materials.where(normalized_source_key: suppression.normalized_source_key)
-    end
-  end
-end

backend/app/services/material_thumbnail_generator.rb

@@ -1,126 +0,0 @@
-# frozen_string_literal: true
-
-require 'mini_magick'
-require 'open3'
-require 'tempfile'
-
-
-class MaterialThumbnailGenerator
-  SIZE = '180x180'
-
-  class << self
-    def generate! material
-      new(material).generate!
-    end
-  end
-
-  def initialize material
-    @material = material
-    @ffmpeg_stderr = []
-  end
-
-  def generate!
-    return log_result(:no_file) unless @material.file.attached?
-    return log_result(:unsupported_content_type) unless image? || video?
-
-    @material.file.blob.open do |file|
-      thumbnail = image? ? image_thumbnail(file.path) : video_thumbnail(file.path)
-      return log_result(:generation_failed) unless thumbnail
-
-      return attach_thumbnail(thumbnail)
-    end
-  rescue ActiveStorage::FileNotFoundError => e
-    log_result(:file_not_found, error: e)
-  rescue MiniMagick::Error => e
-    log_result(:mini_magick_error, error: e)
-  rescue ArgumentError, StandardError => e
-    log_result(:generation_failed, error: e)
-  end
-
-  private
-
-  def image? = content_type.start_with?('image/')
-
-  def video? = content_type.start_with?('video/')
-
-  def content_type
-    return nil unless @material.file.attached?
-
-    @material.file.blob.content_type.to_s
-  end
-
-  def image_thumbnail path
-    image = MiniMagick::Image.open(path)
-    image.resize(SIZE)
-    image.format('jpg')
-    image
-  end
-
-  def video_thumbnail path
-    [1, 0].each do |seconds|
-      tempfile = Tempfile.new(['material-thumbnail', '.jpg'])
-      tempfile.close
-      ok = extract_video_frame(path, tempfile.path, seconds)
-      next unless ok && File.size?(tempfile.path)
-
-      return image_thumbnail(tempfile.path)
-    ensure
-      tempfile&.unlink
-    end
-
-    nil
-  end
-
-  def extract_video_frame input_path, output_path, seconds
-    _stdout, stderr, status =
-        Open3.capture3('ffmpeg',
-                       '-y',
-                       '-ss', seconds.to_s,
-                       '-i', input_path,
-                       '-frames:v', '1',
-                       '-f', 'image2',
-                       output_path)
-    @ffmpeg_stderr << stderr if stderr.present?
-    status.success?
-  rescue Errno::ENOENT => e
-    @ffmpeg_stderr << "ffmpeg unavailable: #{ e.message }"
-    false
-  end
-
-  def attach_thumbnail image
-    blob = nil
-    File.open(image.path) do |io|
-      blob = ActiveStorage::Blob.create_and_upload!(
-          io:,
-          filename: 'material-thumbnail.jpg',
-          content_type: 'image/jpeg')
-    end
-    @material.thumbnail.attach(blob)
-    log_result(:attached)
-  rescue StandardError => e
-    blob&.purge_later
-    log_result(:attach_failed, error: e)
-  end
-
-  def log_result result, error: nil
-    log_payload = { material_id: @material.id,
-                    file_blob_id: file_blob_id,
-                    content_type:,
-                    result:,
-                    error_class: error&.class&.name,
-                    error_message: error&.message,
-                    ffmpeg_stderr: @ffmpeg_stderr.join("\n").presence }
-    if [:attached, :no_file, :unsupported_content_type].include?(result)
-      Rails.logger.info("Material thumbnail generation: #{ log_payload.to_json }")
-    else
-      Rails.logger.warn("Material thumbnail generation: #{ log_payload.to_json }")
-    end
-    result
-  end
-
-  def file_blob_id
-    return nil unless @material.file.attached?
-
-    @material.file.blob.id
-  end
-end

backend/app/services/material_version_recorder.rb

@@ -1,73 +0,0 @@
-class MaterialVersionRecorder < VersionRecorder
-  EVENT_TYPES = ['create', 'update', 'discard', 'restore'].freeze
-
-  def self.record! material:, event_type:, created_by_user:, file_snapshot: nil
-    new(material:, event_type:, created_by_user:, file_snapshot:).record!
-  end
-
-  def initialize material:, event_type:, created_by_user:, file_snapshot: nil
-    @file_snapshot = file_snapshot
-
-    super(record: material, event_type:, created_by_user:)
-  end
-
-  def self.ensure_snapshot! material, created_by_user:
-    return if material.material_versions.exists?
-
-    record!(material:, event_type: :create,
-            created_by_user: material.created_by_user || created_by_user)
-  end
-
-  private
-
-  def version_class = MaterialVersion
-  def version_association = :material_versions
-  def record_key = :material
-
-  def snapshot_attributes
-    blob = @record.file.attached? ? @record.file.blob : nil
-    file_snapshot = build_file_snapshot(blob)
-
-    { url: @record.url,
-      parent: @record.parent,
-      tag: @record.tag,
-      tag_name: @record.tag&.name,
-      tag_category: @record.tag&.category,
-      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],
-      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] }
-  end
-
-  def build_file_snapshot blob
-    return @file_snapshot if @file_snapshot
-    return empty_file_snapshot unless blob
-
-    { file_blob_id: blob.id,
-      file_filename: blob.filename.to_s,
-      file_content_type: blob.content_type,
-      file_byte_size: blob.byte_size,
-      file_checksum: blob.checksum,
-      file_sha256: MaterialFileSha256.metadata_sha256(blob) }
-  end
-
-  def empty_file_snapshot
-    { file_blob_id: nil,
-      file_filename: nil,
-      file_content_type: nil,
-      file_byte_size: nil,
-      file_checksum: nil,
-      file_sha256: nil }
-  end
-
-  def event_types = self.class::EVENT_TYPES
-end

backend/app/services/material_zip_exporter.rb

@@ -1,148 +0,0 @@
-require 'stringio'
-require 'zlib'
-
-# Initial implementation keeps every file payload and the final ZIP in memory.
-# Keep this service boundary stable so job/cached export paths can replace it later.
-class MaterialZipExporter
-  Entry = Struct.new(:path, :data, :mtime, keyword_init: true)
-  MissingFile = Struct.new(:material_id, :export_path, :blob_id, :filename, keyword_init: true)
-
-  class EmptyExportError < StandardError; end
-  class DuplicatePathError < StandardError; end
-  class MissingFileError < StandardError
-    attr_reader :missing_files
-
-    def initialize missing_files
-      @missing_files = missing_files
-
-      super("Missing files: #{missing_files.map(&:export_path).join(', ')}")
-    end
-  end
-
-  def initialize profile: 'legacy_drive', tag_id: nil
-    @profile = profile.presence || 'legacy_drive'
-    @tag_id = tag_id.presence
-  end
-
-  def export
-    entries = build_entries
-    raise EmptyExportError if entries.empty?
-
-    ZipWriter.write(entries)
-  end
-
-  private
-
-  def build_entries
-    rows = MaterialExportItem
-           .enabled
-           .includes(material: { file_attachment: :blob })
-           .joins(:material)
-           .merge(Material.kept)
-           .where(profile: @profile)
-           .order(:export_path)
-
-    rows = rows.where(materials: { tag_id: @tag_id }) if @tag_id
-
-    missing_files = []
-
-    entries = rows.filter_map do |item|
-      material = item.material
-      next unless material.file.attached?
-
-      data = download_blob(item, missing_files)
-      next unless data
-
-      Entry.new(path: item.export_path,
-                data:,
-                mtime: material.updated_at || Time.current)
-    end
-
-    raise MissingFileError.new(missing_files) if missing_files.any?
-
-    paths = entries.map(&:path)
-    duplicated = paths.find { |path| paths.count(path) > 1 }
-    raise DuplicatePathError, duplicated if duplicated
-
-    entries
-  end
-
-  def download_blob item, missing_files
-    blob = item.material.file.blob
-
-    blob.download
-  rescue ActiveStorage::FileNotFoundError
-    missing_files << MissingFile.new(
-        material_id: item.material_id,
-        export_path: item.export_path,
-        blob_id: blob.id,
-        filename: blob.filename.to_s,
-    )
-    nil
-  end
-
-  class ZipWriter
-    VERSION_NEEDED = 20
-    GP_FLAG = 0x0800
-    COMPRESSION_STORE = 0
-
-    def self.write entries
-      new(entries).write
-    end
-
-    def initialize entries
-      @entries = entries
-      @central_directory = []
-    end
-
-    def write
-      io = StringIO.new(''.b)
-
-      @entries.each do |entry|
-        write_entry(io, entry)
-      end
-
-      central_start = io.pos
-      @central_directory.each { |header| io.write(header) }
-      central_size = io.pos - central_start
-
-      io.write([0x06054b50, 0, 0, @entries.size, @entries.size,
-                central_size, central_start, 0].pack('VvvvvVVv'))
-      io.string
-    end
-
-    private
-
-    def write_entry io, entry
-      path = entry.path.b
-      data = entry.data.b
-      crc32 = Zlib.crc32(data)
-      dos_time, dos_date = dos_timestamp(entry.mtime)
-      offset = io.pos
-
-      local_header = [0x04034b50, VERSION_NEEDED, GP_FLAG, COMPRESSION_STORE,
-                      dos_time, dos_date, crc32, data.bytesize, data.bytesize,
-                      path.bytesize, 0].pack('VvvvvvVVVvv')
-
-      io.write(local_header)
-      io.write(path)
-      io.write(data)
-
-      @central_directory << central_header(path:, crc32:, size: data.bytesize,
-                                           dos_time:, dos_date:, offset:)
-    end
-
-    def central_header path:, crc32:, size:, dos_time:, dos_date:, offset:
-      [0x02014b50, VERSION_NEEDED, VERSION_NEEDED, GP_FLAG, COMPRESSION_STORE,
-       dos_time, dos_date, crc32, size, size, path.bytesize, 0, 0, 0, 0, 0,
-       offset].pack('VvvvvvvVVVvvvvvVV') + path
-    end
-
-    def dos_timestamp time
-      local = time.to_time
-      dos_time = (local.hour << 11) | (local.min << 5) | (local.sec / 2)
-      dos_date = ((local.year - 1980) << 9) | (local.month << 5) | local.day
-      [dos_time, dos_date]
-    end
-  end
-end

backend/app/services/post_creator.rb

@@ -1,122 +0,0 @@
-class PostCreator
-  class VideoMsParseError < ArgumentError; end
-
-  def initialize actor:, attributes:
-    @actor = actor
-    @attributes = attributes.symbolize_keys
-  end
-
-  def create!
-    post = Post.new(title: @attributes[:title].presence,
-                    url: @attributes[:url],
-                    thumbnail_base: @attributes[:thumbnail_base].presence,
-                    uploaded_user: @actor,
-                    original_created_from: @attributes[:original_created_from].presence,
-                    original_created_before: @attributes[:original_created_before].presence)
-    thumbnail = @attributes[:thumbnail]
-    post.thumbnail.attach(Post.resized_thumbnail_attachment(thumbnail)) if thumbnail.present?
-
-    ApplicationRecord.transaction do
-      post.save!
-      Tag.normalise_tags!(tag_names, deny_deprecated: true, with_sections: true) =>
-          { tags:, sections: }
-      TagVersioning.record_tag_snapshots!(tags, created_by_user: @actor)
-      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_parent_posts!(post, parent_post_ids)
-      PostVersionRecorder.record!(post:, event_type: :create, created_by_user: @actor)
-    end
-    post
-  end
-
-  private
-
-  def tag_names = @attributes[:tags].to_s.split
-
-  def parent_post_ids
-    Array(@attributes[:parent_post_ids]).flat_map { _1.to_s.split }.map { |token|
-      id = Integer(token, exception: false)
-      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if id.nil? || id <= 0
-
-      id
-    }.uniq
-  end
-
-  def normalise_video_ms tags
-    return nil unless tags.any? { _1.id == Tag.video.id }
-
-    video_ms = @attributes[:video_ms]
-    if video_ms.present?
-      value = Integer(video_ms, exception: false)
-      raise VideoMsParseError unless value&.positive?
-
-      return value
-    end
-    duration = @attributes[:duration]
-    return nil if duration.blank?
-
-    return duration.to_i if duration.is_a?(Numeric) && duration.to_i.positive?
-
-    value = Tag.time_to_ms!(duration.to_s, tag_name: '動画時間')
-    raise VideoMsParseError unless value.positive?
-
-    value
-  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|
-        post = Post.new
-        if begin_ms >= video_ms
-          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.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
-
-  def sync_post_tags! post, desired_tags, sections
-    desired_ids = desired_tags.map(&:id).to_set
-    current_ids = post.tags.pluck(:id).to_set
-    Tag.where(id: desired_ids - current_ids).find_each do |tag|
-      PostTag.create_or_find_by!(post:, tag:, created_user: @actor)
-    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: (current_ids - desired_ids).to_a).kept.find_each do |post_tag|
-      post_tag.discard_by!(@actor)
-    end
-  end
-
-  def sync_parent_posts! post, ids
-    if ids.include?(post.id)
-      post.errors.add :parent_post_ids, '自分自身を親投稿にはできません．'
-      raise ActiveRecord::RecordInvalid, post
-    end
-    missing = ids - Post.where(id: ids).pluck(:id)
-    if missing.present?
-      post.errors.add :parent_post_ids, "存在しない親投稿 Id. があります: #{ missing.join(' ') }"
-      raise ActiveRecord::RecordInvalid, post
-    end
-    ids.each { |parent_post_id| PostImplication.create_or_find_by!(post:, parent_post_id:) }
-  end
-end

backend/app/services/post_import_previewer.rb

@@ -1,485 +0,0 @@
-require 'time'
-require 'timeout'
-
-class PostImportPreviewer
-  FIELDS = [
-    'title',
-    'thumbnail_base',
-    'original_created_from',
-    'original_created_before',
-    'duration',
-    'tags',
-    'parent_post_ids'].freeze
-  FETCH_WARNING_FIELDS = ['url', 'title', 'thumbnail_base'].freeze
-  TITLE_FETCH_WARNING = 'タイトルを取得できませんでした．'.freeze
-  THUMBNAIL_FETCH_WARNING = 'サムネールを取得できませんでした．'.freeze
-  METADATA_FETCH_WARNING = 'メタデータを取得できませんでした．'.freeze
-
-  def preview_rows rows:, fetch_metadata: true, metadata_cache: { }
-    prepared_rows = rows.map { prepare_row(_1) }
-    url_counts = prepared_rows.filter_map { _1[:normal_url] }.tally
-    existing_posts =
-        Post.where(url: prepared_rows.map { _1[:normal_url] }.compact.uniq).index_by(&:url)
-    existing_parent_ids = preload_parent_ids(prepared_rows)
-    preload_metadata!(
-        prepared_rows,
-        fetch_metadata,
-        metadata_cache,
-        existing_posts,
-        url_counts)
-    known_tags =
-        preload_known_tags(
-            prepared_rows,
-            fetch_metadata,
-            metadata_cache,
-            existing_posts,
-            url_counts)
-    prepared_rows.map { |row|
-      preview_row(row,
-                  fetch_metadata:,
-                  metadata_cache:,
-                  existing_posts:,
-                  url_counts:,
-                  known_tags:,
-                  existing_parent_ids:)
-    }
-  end
-
-  def normalised_url value
-    PostUrlNormaliser.normalise(value)
-  end
-
-  private
-
-  def prepare_row row
-    source = row.symbolize_keys
-    url = source[:url].to_s.strip
-    normal_url = normalised_url(url)
-    source.merge(url_text: url, normal_url:, url_error: validate_url_safety(normal_url))
-  end
-
-  def preview_row row,
-                  fetch_metadata:,
-                  metadata_cache:,
-                  existing_posts:,
-                  url_counts:,
-                  known_tags:,
-                  existing_parent_ids:
-    attributes = initial_attributes(row)
-    provenance = initial_provenance(row)
-    tag_sources = initial_tag_sources(row, attributes, provenance)
-    field_warnings = initial_field_warnings(row)
-    base_warnings = initial_base_warnings(row)
-    url = row[:url_text]
-    provenance['url'] = 'manual'
-    normal_url = row[:normal_url]
-    url_for_metadata = normal_url || url
-    existing_post = normal_url.present? ? existing_posts[normal_url] : nil
-
-    validation_errors = {}
-    validation_errors[:url] = ['URL が不正です．'] if normal_url.blank?
-    if row[:url_error].present?
-      validation_errors[:url] = [row[:url_error]]
-    end
-    if normal_url.present? && url_counts[normal_url].to_i > 1
-      validation_errors[:url] = ['URL が重複しています．']
-    end
-
-    if row[:metadata_url].present? && row[:metadata_url] != url_for_metadata
-      clear_automatic_values!(attributes, provenance, tag_sources)
-      field_warnings = { }
-      base_warnings = [ ]
-    end
-
-    if validation_errors.blank? && normal_url.present? && existing_post
-      attributes['tags'] = merged_tags(tag_sources, provenance['tags'])
-      warnings_present = field_warnings.values.any?(&:present?) || base_warnings.present?
-      return { source_row: row[:source_row],
-               url: normal_url,
-               attributes:,
-               provenance:,
-               tag_sources:,
-               metadata_url: url_for_metadata,
-               skip_reason: 'existing',
-               existing_post_id: existing_post.id,
-               field_warnings:,
-               base_warnings:,
-               validation_errors:,
-               status: warnings_present ? 'warning' : 'ready' }
-    end
-
-    should_fetch = validation_errors.blank?
-    should_fetch &&= should_fetch_metadata?(fetch_metadata, row[:source_row].to_i)
-    if should_fetch
-      clear_fetch_warnings!(field_warnings)
-      metadata = metadata_for(url_for_metadata, metadata_cache)
-      if metadata[:validation_errors].present?
-        validation_errors.merge!(metadata[:validation_errors])
-      else
-        apply_metadata!(attributes, provenance, tag_sources, metadata[:data])
-        apply_fetch_warnings!(field_warnings, metadata[:warnings])
-      end
-    end
-
-    attributes['url'] = url
-    validate_basic_data(attributes, validation_errors)
-    validate_preview_tags(merged_tags(tag_sources, provenance['tags']),
-                          validation_errors,
-                          field_warnings,
-                          known_tags)
-    validate_parents(attributes['parent_post_ids'], validation_errors, existing_parent_ids)
-    attributes.delete('url')
-    attributes['tags'] = merged_tags(tag_sources, provenance['tags'])
-
-    warnings_present = field_warnings.values.any?(&:present?) || base_warnings.present?
-    { source_row: row[:source_row],
-      url: validation_errors[:url].present? ? url : (normal_url || url),
-      attributes:,
-      provenance:,
-      tag_sources:,
-      metadata_url: url_for_metadata,
-      skip_reason: nil,
-      existing_post_id: nil,
-      field_warnings:,
-      base_warnings:,
-      validation_errors:,
-      status: validation_errors.present? ? 'error' : (warnings_present ? 'warning' : 'ready') }
-  end
-
-  def should_fetch_metadata? fetch_metadata, source_row
-    case fetch_metadata
-    when true then true
-    when Integer then fetch_metadata == source_row
-    when false, nil then false
-    else raise ArgumentError, 'メタデータ取得対象が不正です．'
-    end
-  end
-
-  def initial_attributes row
-    attributes = row[:attributes]&.stringify_keys || { }
-    FIELDS.to_h { |field| [field, attributes[field].to_s] }
-  end
-
-  def initial_provenance row
-    provenance = row[:provenance]&.stringify_keys || { }
-    FIELDS.to_h { |field| [field, provenance[field].presence || 'automatic'] }
-      .merge('url' => 'manual')
-  end
-
-  def initial_tag_sources row, attributes, provenance
-    sources = row[:tag_sources]&.stringify_keys || { 'automatic' => '', 'manual' => '' }
-    sources['automatic'] = sources['automatic'].to_s
-    sources['manual'] =
-      provenance['tags'] == 'manual' ? attributes['tags'].to_s : sources['manual'].to_s
-    sources
-  end
-
-  def initial_field_warnings row
-    (row[:field_warnings] || { })
-      .stringify_keys
-      .transform_values { |value| Array(value).map(&:to_s) }
-  end
-
-  def initial_base_warnings row
-    Array(row[:base_warnings]).map(&:to_s)
-  end
-
-  def clear_automatic_values! attributes, provenance, tag_sources
-    ['title', 'thumbnail_base', 'original_created_from',
-     'original_created_before', 'duration'].each do |field|
-      attributes[field] = '' if provenance[field] == 'automatic'
-    end
-    tag_sources['automatic'] = ''
-    attributes['tags'] = merged_tags(tag_sources, provenance['tags'])
-  end
-
-  def clear_fetch_warnings! field_warnings
-    FETCH_WARNING_FIELDS.each do |field|
-      field_warnings.delete(field)
-    end
-  end
-
-  def metadata_for url, cache
-    cache[url] ||= fetch_metadata(url)
-  end
-
-  def fetch_metadata url
-    return { data: { }, warnings: { 'url' => ['URL が空です．'] },
-             validation_errors: { } } if url.blank?
-
-    data = sanitise_metadata(PostMetadataFetcher.fetch(url).stringify_keys.compact)
-    warnings = { }
-    add_field_warning!(warnings, 'title', TITLE_FETCH_WARNING) if data['title'].blank?
-    if data['thumbnail_base'].blank?
-      add_field_warning!(warnings, 'thumbnail_base', THUMBNAIL_FETCH_WARNING)
-    end
-    { data:, warnings:, validation_errors: { } }
-  rescue Preview::UrlSafety::UnsafeUrl => e
-    Rails.logger.info(
-        "post_import_metadata_fetch_unsafe_url "\
-        "#{ { error: e.class.name, message: e.message }.to_json }")
-    { data: { }, warnings: { }, validation_errors: { url: [e.message] } }
-  rescue Preview::HttpFetcher::FetchFailed,
-         Preview::HttpFetcher::ResponseTooLarge => e
-    Rails.logger.info(
-        "post_import_metadata_fetch_failure "\
-        "#{ { error: e.class.name, message: e.message }.to_json }")
-    { data: { }, warnings: { 'url' => [METADATA_FETCH_WARNING] }, validation_errors: { } }
-  end
-
-  def sanitise_metadata metadata
-    {
-        'title' => sanitise_metadata_title(metadata['title']),
-        'thumbnail_base' => sanitise_metadata_url(metadata['thumbnail_base']),
-        'original_created_from' => sanitise_metadata_time(metadata['original_created_from']),
-        'original_created_before' => sanitise_metadata_time(metadata['original_created_before']),
-        'duration' => sanitise_metadata_duration(metadata['duration']),
-        'tags' => metadata['tags'].to_s.presence }.compact
-  end
-
-  def sanitise_metadata_title value
-    value.is_a?(String) ? value.presence : nil
-  end
-
-  def sanitise_metadata_url value
-    return nil unless value.is_a?(String)
-
-    PostUrlNormaliser.normalise(value)
-  end
-
-  def sanitise_metadata_time value
-    return nil unless value.is_a?(String)
-
-    time = Time.iso8601(value)
-    time.nsec.zero? ? time.iso8601 : time.iso8601(9)
-  rescue ArgumentError, TypeError
-    nil
-  end
-
-  def sanitise_metadata_duration value
-    return nil unless value.is_a?(Numeric)
-
-    value.positive? ? value.to_i : nil
-  end
-
-  def preload_metadata! prepared_rows, fetch_metadata, metadata_cache, existing_posts, url_counts
-    urls = prepared_rows.filter_map { |row|
-      next unless row[:normal_url].present?
-      next if row[:url_error].present?
-      next unless should_fetch_metadata?(fetch_metadata, row[:source_row].to_i)
-      next if url_counts[row[:normal_url]].to_i > 1
-      next if existing_posts.key?(row[:normal_url])
-
-      row[:normal_url]
-    }.uniq
-    urls = urls.reject { metadata_cache.key?(_1) }
-    return if urls.empty?
-
-    url_queue = Queue.new
-    result_queue = Queue.new
-    urls.each { url_queue << _1 }
-    workers = [urls.length, 4].min.times.map {
-      Thread.new {
-        Rails.application.executor.wrap do
-          loop do
-            url = url_queue.pop(true)
-            result_queue << [url, safe_fetch_metadata(url)]
-          rescue ThreadError
-            break
-          end
-        end
-      }
-    }
-    Timeout.timeout(15) { workers.each(&:join) }
-  rescue Timeout::Error
-    workers&.each(&:kill)
-  ensure
-    workers&.each(&:join)
-    while result_queue&.size.to_i.positive?
-      url, result = result_queue.pop
-      metadata_cache[url] = result
-    end
-    urls&.each do |url|
-      metadata_cache[url] ||= { data: { }, warnings: { 'url' => [METADATA_FETCH_WARNING] } }
-    end
-  end
-
-  def safe_fetch_metadata url
-    fetch_metadata(url)
-  rescue Preview::UrlSafety::UnsafeUrl => e
-    Rails.logger.info(
-        "post_import_metadata_fetch_unsafe_url "\
-        "#{ { error: e.class.name, message: e.message }.to_json }")
-    { data: { }, warnings: { }, validation_errors: { url: [e.message] } }
-  rescue StandardError => e
-    Rails.logger.error(
-        "post_import_metadata_fetch_unexpected_failure "\
-        "#{ { error: e.class.name, message: e.message }.to_json }")
-    { data: { }, warnings: { 'url' => [METADATA_FETCH_WARNING] }, validation_errors: { } }
-  end
-
-  def preload_known_tags prepared_rows, fetch_metadata, metadata_cache, existing_posts, url_counts
-    names = prepared_rows.flat_map { |row|
-      attributes = initial_attributes(row)
-      provenance = initial_provenance(row)
-      tag_sources = initial_tag_sources(row, attributes, provenance)
-      if metadata_url_changed?(row)
-        clear_automatic_values!(attributes, provenance, tag_sources)
-      end
-      if should_apply_metadata_to_row?(row, fetch_metadata, existing_posts, url_counts)
-        metadata = metadata_for(row[:normal_url], metadata_cache)
-        apply_metadata!(attributes, provenance, tag_sources, metadata[:data])
-      end
-      preview_tag_names(merged_tags(tag_sources, provenance['tags']))
-    }.compact.uniq
-    return { } if names.empty?
-
-    Tag.joins(:tag_name)
-      .where(tag_names: { name: names })
-      .includes(:tag_name)
-      .to_a
-      .index_by(&:name)
-  end
-
-  def preload_parent_ids prepared_rows
-    ids = prepared_rows.flat_map { |row|
-      attributes = initial_attributes(row)
-      preview_parent_ids(attributes['parent_post_ids'])
-    }.uniq
-    return { } if ids.empty?
-
-    Post.where(id: ids).pluck(:id).to_h { [_1, true] }
-  end
-
-  def metadata_url_changed? row
-    row[:metadata_url].present? && row[:metadata_url] != (row[:normal_url] || row[:url_text])
-  end
-
-  def should_apply_metadata_to_row? row, fetch_metadata, existing_posts, url_counts
-    normal_url = row[:normal_url]
-    return false if normal_url.blank?
-    return false if row[:url_error].present?
-    return false if url_counts[normal_url].to_i > 1
-    return false if existing_posts.key?(normal_url)
-
-    should_fetch_metadata?(fetch_metadata, row[:source_row].to_i)
-  end
-
-  def validate_url_safety normal_url
-    return nil if normal_url.blank?
-
-    Preview::UrlSafety.validate(normal_url)
-    nil
-  rescue Preview::UrlSafety::UnsafeUrl => e
-    e.message
-  end
-
-  def apply_metadata! attributes, provenance, tag_sources, metadata
-    metadata.each do |field, value|
-      if field == 'tags'
-        next if provenance['tags'] == 'manual'
-
-        tag_sources['automatic'] = value.to_s
-        attributes['tags'] = merged_tags(tag_sources)
-        next
-      end
-      next unless provenance[field] == 'automatic'
-
-      attributes[field] = value
-      provenance[field] = 'automatic'
-    end
-  end
-
-  def apply_fetch_warnings! field_warnings, warnings
-    warnings.each do |field, values|
-      values.each do |value|
-        add_field_warning!(field_warnings, field, value)
-      end
-    end
-  end
-
-  def add_field_warning! field_warnings, field, message
-    field_warnings[field] ||= []
-    field_warnings[field] << message unless field_warnings[field].include?(message)
-  end
-
-  def merged_tags sources, origin = nil
-    return sources['manual'].to_s if origin == 'manual'
-
-    sources['automatic'].to_s
-  end
-
-  def preview_tag_names raw
-    names = raw.to_s.split
-    return [] if names.empty?
-    if names.any? { _1.downcase.start_with?('nico:') }
-      return []
-    end
-
-    names.map { |name| TagName.canonicalise(name.sub(/\[.*\]\z/, '')).first }
-  rescue Tag::SectionLiteralParseError
-    []
-  end
-
-  def validate_preview_tags raw, errors, field_warnings, known_tags
-    names = raw.to_s.split
-    return if names.empty?
-    if names.any? { _1.downcase.start_with?('nico:') }
-      errors[:tags] = ['ニコニコ・タグは直接指定できません．']
-      return
-    end
-
-    parsed = names.map { |name| TagName.canonicalise(name.sub(/\[.*\]\z/, '')).first }
-    existing = parsed.filter_map { known_tags[_1] }
-    deprecated = existing.select(&:deprecated?).map(&:name)
-    errors[:tags] = ["廃止済みタグがあります: #{ deprecated.join(' ') }"] if deprecated.present?
-    known = existing.reject(&:deprecated?).map(&:name)
-    new_tags = parsed.uniq - known
-    if new_tags.present?
-      add_field_warning!(field_warnings, 'tags', "新規タグを作成します: #{ new_tags.join(' ') }")
-    end
-  rescue Tag::SectionLiteralParseError
-    errors[:tags] = ['タグ区間の記法が不正です．']
-  end
-
-  def validate_basic_data attributes, errors
-    post = Post.new(title: attributes['title'].presence,
-                    url: attributes['url'],
-                    thumbnail_base: attributes['thumbnail_base'].presence,
-                    original_created_from: attributes['original_created_from'].presence,
-                    original_created_before: attributes['original_created_before'].presence,
-                    video_ms: parse_duration(attributes['duration'], errors))
-    post.valid?
-    post.errors.each do |error|
-      next if error.attribute == :url && error.type == :taken
-
-      (errors[error.attribute] ||= []) << error.message
-    end
-  end
-
-  def parse_duration value, errors
-    return nil if value.blank?
-
-    value.is_a?(Numeric) ? value.to_i : Tag.time_to_ms!(value.to_s, tag_name: '動画時間')
-  rescue Tag::SectionLiteralParseError
-    errors[:video_ms] = ['動画時間の記法が不正です．']
-    nil
-  end
-
-  def preview_parent_ids raw
-    raw.to_s.split.map { Integer(_1, exception: false) }.compact
-  end
-
-  def validate_parents raw, errors, existing_parent_ids
-    ids = raw.to_s.split.map { Integer(_1, exception: false) }
-    return if ids.compact.empty? && raw.to_s.blank?
-
-    if ids.any? { _1.nil? || _1 <= 0 }
-      errors[:parent_post_ids] = ['親投稿 Id. が不正です．']
-      return
-    end
-    if ids.uniq.any? { !existing_parent_ids[_1] }
-      errors[:parent_post_ids] = ['存在しない親投稿 Id. があります．']
-    end
-  end
-end

backend/app/services/post_import_row_normaliser.rb

@@ -1,189 +0,0 @@
-class PostImportRowNormaliser
-  ORIGINS = ['automatic', 'manual'].freeze
-  STRING_FIELDS = [
-    'title',
-    'thumbnail_base',
-    'original_created_from',
-    'original_created_before',
-    'tags',
-    'parent_post_ids'].freeze
-  FLEXIBLE_FIELDS = ['duration', 'video_ms'].freeze
-  ATTRIBUTE_FIELDS = (STRING_FIELDS + FLEXIBLE_FIELDS).freeze
-
-  def self.normalise! rows, allow_warning_fields: false
-    raise ArgumentError, '取込行の形式が不正です．' unless rows.is_a?(Array)
-    raise ArgumentError, '取込件数が多すぎます．' if rows.length > PostImportUrlListParser::MAX_ROWS
-
-    normalised_rows = rows.map { normalise_row!(_1, allow_warning_fields:) }
-    source_rows = normalised_rows.map { _1['source_row'] }
-    raise ArgumentError, '元行番号が重複しています．' if source_rows.uniq.length != source_rows.length
-    if normalised_rows.sum { row_bytesize(_1) } > PostImportUrlListParser::MAX_BYTES
-      raise ArgumentError, '取込データが大きすぎます．'
-    end
-
-    normalised_rows
-  end
-
-  def self.normalise_row! row, allow_warning_fields:
-    unless row.is_a?(Hash) || row.is_a?(ActionController::Parameters)
-      raise ArgumentError, '取込行の形式が不正です．'
-    end
-
-    parameters =
-        row.is_a?(ActionController::Parameters) ? row : ActionController::Parameters.new(row)
-    permitted = parameters.permit(*permitted_keys(allow_warning_fields))
-    normalised = permitted.to_h.deep_transform_keys { _1.to_s.underscore }
-
-    normalised['source_row'] = normalise_source_row!(normalised['source_row'])
-    normalise_url!(normalised['url'])
-    normalise_metadata_url!(normalised['metadata_url'])
-    normalise_attributes!(normalised.fetch('attributes', { }))
-    normalise_provenance!(normalised.fetch('provenance', { }))
-    normalise_tag_sources!(normalised['tag_sources'])
-    normalise_warning_values!(normalised, allow_warning_fields:)
-    if row_bytesize(normalised) > PostImportUrlListParser::MAX_BYTES
-      raise ArgumentError, '取込行が大きすぎます．'
-    end
-
-    normalised
-  end
-
-  def self.permitted_keys allow_warning_fields
-    keys = [
-      :source_row,
-      :sourceRow,
-      :url,
-      :metadata_url,
-      :metadataUrl,
-      { attributes: {} },
-      { provenance: {} },
-      { tag_sources: {} },
-      { tagSources: {} }]
-    return keys unless allow_warning_fields
-
-    keys + [
-      { field_warnings: {} },
-      { fieldWarnings: {} },
-      { base_warnings: [] },
-      { baseWarnings: [] }]
-  end
-  private_class_method :permitted_keys
-
-  def self.normalise_source_row! value
-    source_row = Integer(value, exception: false)
-    raise ArgumentError, '元行番号が不正です．' if source_row.nil? || source_row <= 0
-
-    source_row
-  end
-  private_class_method :normalise_source_row!
-
-  def self.normalise_url! value
-    unless value.is_a?(String)
-      raise ArgumentError, 'URL の形式が不正です．'
-    end
-    if value.bytesize > PostImportUrlListParser::MAX_URL_BYTES
-      raise ArgumentError, 'URL が長すぎます．'
-    end
-  end
-  private_class_method :normalise_url!
-
-  def self.normalise_metadata_url! value
-    raise ArgumentError, 'metadata_url の形式が不正です．' unless value.nil? || value.is_a?(String)
-    if value.to_s.bytesize > PostImportUrlListParser::MAX_URL_BYTES
-      raise ArgumentError, 'metadata_url が長すぎます．'
-    end
-  end
-  private_class_method :normalise_metadata_url!
-
-  def self.normalise_attributes! attributes
-    raise ArgumentError, 'attributes の形式が不正です．' unless attributes.is_a?(Hash)
-    raise ArgumentError, '取込項目が不正です．' unless (attributes.keys - ATTRIBUTE_FIELDS).empty?
-
-    attributes.each do |key, value|
-      case key
-      when *STRING_FIELDS
-        raise ArgumentError, '取込項目の型が不正です．' unless value.nil? || value.is_a?(String)
-      when *FLEXIBLE_FIELDS
-        unless value.nil? || value.is_a?(String) || value.is_a?(Numeric)
-          raise ArgumentError, '取込項目の型が不正です．'
-        end
-      end
-      if value.to_s.bytesize > PostImportUrlListParser::MAX_URL_BYTES
-        raise ArgumentError, '取込項目が大きすぎます．'
-      end
-    end
-  end
-  private_class_method :normalise_attributes!
-
-  def self.normalise_provenance! provenance
-    unless provenance.is_a?(Hash)
-      raise ArgumentError, 'provenance の形式が不正です．'
-    end
-
-    allowed = ATTRIBUTE_FIELDS + ['url']
-    unless (provenance.keys - allowed).empty?
-      raise ArgumentError, '値の由来が不正です．'
-    end
-    unless provenance.values.all? { ORIGINS.include?(_1) }
-      raise ArgumentError, '値の由来が不正です．'
-    end
-  end
-  private_class_method :normalise_provenance!
-
-  def self.normalise_tag_sources! tag_sources
-    return if tag_sources.nil?
-
-    unless tag_sources.is_a?(Hash)
-      raise ArgumentError, 'タグ由来の形式が不正です．'
-    end
-    unless (tag_sources.keys - ORIGINS).empty?
-      raise ArgumentError, 'タグ由来の形式が不正です．'
-    end
-    unless tag_sources.values.all? { _1.is_a?(String) }
-      raise ArgumentError, 'タグ由来の形式が不正です．'
-    end
-    if tag_sources.values.any? { _1.bytesize > PostImportUrlListParser::MAX_URL_BYTES }
-      raise ArgumentError, 'タグ由来が大きすぎます．'
-    end
-    if tag_sources.values.sum(&:bytesize) > PostImportUrlListParser::MAX_URL_BYTES
-      raise ArgumentError, 'タグ由来が大きすぎます．'
-    end
-  end
-  private_class_method :normalise_tag_sources!
-
-  def self.normalise_warning_values! normalised, allow_warning_fields:
-    return unless allow_warning_fields
-
-    field_warnings = normalised['field_warnings']
-    unless field_warnings.nil? || field_warnings.is_a?(Hash)
-      raise ArgumentError, '警告の形式が不正です．'
-    end
-    field_warnings&.each do |key, values|
-      unless ATTRIBUTE_FIELDS.include?(key) || key == 'url'
-        raise ArgumentError, '警告の形式が不正です．'
-      end
-      unless values.is_a?(Array) && values.all? { _1.is_a?(String) }
-        raise ArgumentError, '警告の形式が不正です．'
-      end
-      if values.any? { _1.bytesize > PostImportUrlListParser::MAX_URL_BYTES }
-        raise ArgumentError, '警告が大きすぎます．'
-      end
-    end
-
-    base_warnings = normalised['base_warnings']
-    return if base_warnings.nil?
-
-    unless base_warnings.is_a?(Array) && base_warnings.all? { _1.is_a?(String) }
-      raise ArgumentError, '警告の形式が不正です．'
-    end
-    if base_warnings.any? { _1.bytesize > PostImportUrlListParser::MAX_URL_BYTES }
-      raise ArgumentError, '警告が大きすぎます．'
-    end
-  end
-  private_class_method :normalise_warning_values!
-
-  def self.row_bytesize row
-    row.to_json.bytesize
-  end
-  private_class_method :row_bytesize
-end

backend/app/services/post_import_runner.rb

@@ -1,104 +0,0 @@
-class PostImportRunner
-  def initialize actor:, rows:
-    @actor = actor
-    @rows = rows
-  end
-
-  def run
-    normalised_rows = PostImportRowNormaliser.normalise!(@rows)
-    previews = PostImportPreviewer.new.preview_rows(rows: normalised_rows,
-                                                    fetch_metadata: false)
-    preview_map = previews.index_by { _1[:source_row] }
-
-    results = normalised_rows.map do |row|
-      run_row(row, preview_map.fetch(row['source_row']))
-    end
-
-    { created: results.count { _1[:status] == 'created' },
-      skipped: results.count { _1[:status] == 'skipped' },
-      failed: results.count { _1[:status] == 'failed' },
-      rows: results }
-  end
-
-  private
-
-  def run_row row, preview
-    attributes = row.fetch('attributes', { }).transform_keys { _1.to_s.underscore }
-    return { source_row: row['source_row'],
-             status: 'failed',
-             errors: preview[:validation_errors],
-             recoverable: true } if preview[:validation_errors].present?
-    if preview[:skip_reason] == 'existing'
-      return { source_row: row['source_row'],
-               status: 'skipped',
-               existing_post_id: preview[:existing_post_id] }
-    end
-
-    attributes['tags'] = preview[:attributes]['tags']
-    attributes['url'] = row['url']
-    post = PostCreator.new(actor: @actor, attributes:).create!
-    { source_row: row['source_row'], status: 'created', post: PostRepr.base(post) }
-  rescue ActiveRecord::RecordInvalid => e
-    existing_post = existing_post_for_race(row, e.record)
-    if existing_post
-      return { source_row: row['source_row'],
-               status: 'skipped',
-               existing_post_id: existing_post.id }
-    end
-
-    { source_row: row['source_row'],
-      status: 'failed',
-      errors: e.record.errors.to_hash,
-      recoverable: true }
-  rescue ActiveRecord::RecordNotUnique => e
-    raise unless url_record_not_unique?(e)
-
-    existing_post = existing_post_for_race(row)
-    raise unless existing_post
-
-    { source_row: row['source_row'],
-      status: 'skipped',
-      existing_post_id: existing_post.id }
-  rescue Tag::NicoTagNormalisationError
-    { source_row: row['source_row'],
-      status: 'failed',
-      errors: { tags: ['ニコニコ・タグは直接指定できません．'] },
-      recoverable: true }
-  rescue Tag::DeprecatedTagNormalisationError
-    { source_row: row['source_row'],
-      status: 'failed',
-      errors: { tags: ['廃止済みタグは付与できません．'] },
-      recoverable: true }
-  rescue PostCreator::VideoMsParseError
-    { source_row: row['source_row'],
-      status: 'failed',
-      errors: { duration: ['動画時間の記法が不正です．'] },
-      recoverable: true }
-  rescue ArgumentError
-    { source_row: row['source_row'],
-      status: 'failed',
-      errors: { base: ['入力値が不正です．'] },
-      recoverable: true }
-  rescue StandardError => e
-    Rails.logger.error("post_import_runner_failure #{ { error: e.class.name,
-                                                        message: e.message }.to_json }")
-    { source_row: row['source_row'],
-      status: 'failed',
-      errors: { base: ['登録中にエラーが発生しました．'] } }
-  end
-
-  def existing_post_for_race row, record = nil
-    if record && !(record.errors.of_kind?(:url, :taken))
-      return nil
-    end
-
-    normal_url = PostUrlNormaliser.normalise(row['url'])
-    return nil if normal_url.blank?
-
-    Post.find_by(url: normal_url)
-  end
-
-  def url_record_not_unique? error
-    error.message.include?('index_posts_on_url')
-  end
-end

backend/app/services/post_import_url_list_parser.rb

@@ -1,25 +0,0 @@
-class PostImportUrlListParser
-  MAX_ROWS = 100
-  MAX_BYTES = 1.megabyte
-  MAX_URL_BYTES = 20.kilobytes
-
-  def self.parse source
-    raw = source.to_s
-    raise ArgumentError, '入力が大きすぎます．' if raw.bytesize > MAX_BYTES
-
-    rows = raw.split(/\r\n|\n|\r/).each_with_index.filter_map { |line, index|
-      url = line.strip
-      next if url.blank?
-
-      if url.bytesize > MAX_URL_BYTES
-        raise ArgumentError, "#{ index + 1 } 行目: URL が長すぎます．"
-      end
-
-      { source_row: index + 1, url: }
-    }
-    raise ArgumentError, 'URL を入力してください．' if rows.empty?
-    raise ArgumentError, "取込件数は #{ MAX_ROWS } 件までです．" if rows.length > MAX_ROWS
-
-    rows
-  end
-end

backend/app/services/post_metadata_fetcher.rb

@@ -1,131 +0,0 @@
-require 'time'
-
-class PostMetadataFetcher
-  TIMESTAMP_PATTERN =
-      Regexp.new(
-          '\A(\d{4})-(\d{2})-(\d{2})T(\d{2})' \
-          '(?::(\d{2})(?::(\d{2})(?:\.(\d+))?)?)?' \
-          '(Z|[+-]\d{2}:?\d{2})?\z')
-
-  def self.fetch raw_url
-    uri, = Preview::UrlSafety.validate(raw_url)
-    response = Preview::HttpFetcher.fetch(
-        uri.to_s,
-        max_bytes: Preview::ThumbnailFetcher::HTML_MAX_BYTES)
-    metadata = Preview::HtmlMetadataExtractor.extract(response)
-    document = Nokogiri::HTML.parse(response.body)
-    content = lambda { |name|
-      document
-        .at_css("meta[property='#{ name }'], meta[name='#{ name }']")
-        &.[]('content')
-        &.strip
-        &.presence
-    }
-    duration = content.call('og:video:duration') || content.call('video:duration')
-    published = content.call('article:published_time') || content.call('date')
-    created_range = original_created_range(published)
-    platform_tags = platform_tags(uri)
-    { title: metadata[:title],
-      thumbnail_base:
-          Preview::KnownSiteExtractor.thumbnail_url(uri) || metadata[:image_url],
-      original_created_from: serialise_time(created_range&.first),
-      original_created_before: serialise_time(created_range&.last),
-      duration: duration&.to_f&.then { _1.positive? ? (_1 * 1_000).round : nil },
-      tags: platform_tags.join(' ') }
-  end
-
-  def self.platform_tags uri
-    return ['動画', 'YouTube'] if Preview::KnownSiteExtractor.youtube_video_id(uri)
-    return ['動画', 'ニコニコ'] if Preview::KnownSiteExtractor.niconico_video_id(uri)
-
-    []
-  end
-
-  def self.original_created_range value
-    return nil if value.blank?
-
-    raw = value.to_s.strip
-    from, before =
-        case raw
-        when /\A(\d{4})\z/
-          year = Regexp.last_match(1).to_i
-          from = Time.zone.local(year, 1, 1)
-          [from, from + 1.year]
-        when /\A(\d{4})-(\d{2})\z/
-          year = Regexp.last_match(1).to_i
-          month = Regexp.last_match(2).to_i
-          from = Time.zone.local(year, month, 1)
-          [from, from + 1.month]
-        when /\A(\d{4})-(\d{2})-(\d{2})\z/
-          year = Regexp.last_match(1).to_i
-          month = Regexp.last_match(2).to_i
-          day = Regexp.last_match(3).to_i
-          from = Time.zone.local(year, month, day)
-          [from, from + 1.day]
-        else
-          parse_timestamp_range(raw)
-        end
-    return nil if from.nil? || before.nil?
-
-    [from, before]
-  rescue ArgumentError, TypeError
-    nil
-  end
-
-  def self.parse_timestamp_range raw
-    match = raw.match(TIMESTAMP_PATTERN)
-    return nil unless match
-
-    year = match[1].to_i
-    month = match[2].to_i
-    day = match[3].to_i
-    hour = match[4].to_i
-    minute = match[5]&.to_i || 0
-    second = match[6]&.to_i || 0
-    fraction = match[7]
-    offset = match[8]
-    whole_second = second + fractional_seconds(fraction)
-    from =
-        if offset.present?
-          Time.new(year, month, day, hour, minute, whole_second, parse_offset(offset)).in_time_zone
-        else
-          Time.zone.local(year, month, day, hour, minute, whole_second)
-        end
-    before =
-        if fraction.present?
-          from + (10**(-fraction.length))
-        elsif match[6].present?
-          from + 1.second
-        elsif match[5].present?
-          from + 1.minute
-        else
-          from + 1.hour
-        end
-    [from, before]
-  end
-
-  def self.parse_offset value
-    return '+00:00' if value == 'Z'
-
-    value.match?(/\A[+-]\d{2}:\d{2}\z/) ? value : "#{ value[0, 3] }:#{ value[3, 2] }"
-  end
-
-  def self.fractional_seconds value
-    return 0 if value.blank?
-
-    Rational(value.to_i, 10**value.length)
-  end
-
-  def self.serialise_time value
-    return nil if value.nil?
-
-    value.nsec.zero? ? value.iso8601 : value.iso8601(9)
-  end
-
-  private_class_method :platform_tags,
-                       :original_created_range,
-                       :parse_timestamp_range,
-                       :parse_offset,
-                       :fractional_seconds,
-                       :serialise_time
-end

backend/app/services/post_url_normaliser.rb

@@ -1,13 +0,0 @@
-class PostUrlNormaliser
-  def self.normalise raw_url
-    value = raw_url.to_s.strip
-    uri = URI.parse(value)
-    return nil unless uri.is_a?(URI::HTTP) && uri.host.present?
-
-    uri.host = uri.host.downcase
-    uri.path = uri.path.sub(/\/\z/, '') if uri.path.present?
-    PostUrlSanitisationRule.sanitise(uri.to_s)
-  rescue URI::InvalidURIError
-    nil
-  end
-end

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/app/services/preview/html_metadata_extractor.rb

@@ -1,21 +0,0 @@
-module Preview
-  class HtmlMetadataExtractor
-    IMAGE_SELECTORS = [
-      'meta[property="og:image"]',
-      'meta[name="twitter:image"]',
-      'meta[name="thumbnail"]'
-    ].freeze
-
-    def self.extract(response)
-      document = Nokogiri::HTML.parse(response.body)
-      image_url = IMAGE_SELECTORS.filter_map {
-        document.at_css(_1)&.[]('content')&.strip.presence
-      }.first
-
-      { title: document.at_css('title')&.text&.strip,
-        image_url: image_url ? URI.join(response.url, image_url).to_s : nil }
-    rescue URI::InvalidURIError
-      { title: document.at_css('title')&.text&.strip, image_url: nil }
-    end
-  end
-end

backend/app/services/preview/http_fetcher.rb

@@ -1,127 +0,0 @@
-require 'net/http'
-require 'json'
-
-module Preview
-  class HttpFetcher
-    class FetchFailed < StandardError; end
-    class FetchTimeout < FetchFailed; end
-    class ResponseTooLarge < FetchFailed; end
-
-    MAX_REDIRECTS = 5
-    DEFAULT_MAX_BYTES = 5.megabytes
-
-    Response = Data.define(:body, :content_type, :url)
-
-    def self.fetch(raw_url,
-                   max_bytes: DEFAULT_MAX_BYTES,
-                   redirects: MAX_REDIRECTS)
-      uri, addresses = UrlSafety.validate(raw_url)
-      response = request(uri, addresses.first, max_bytes)
-
-      if response.is_a?(Net::HTTPRedirection)
-        location = response['location']
-        if redirects.zero?
-          log_failure(:redirect_limit,
-                      url: uri.to_s,
-                      redirects:,
-                      location:,
-                      content_type: response['content-type'],
-                      content_length: response['content-length'])
-          raise FetchFailed, 'redirect が多すぎます．'
-        end
-
-        if location.blank?
-          log_failure(:blank_redirect_location,
-                      url: uri.to_s,
-                      redirects:,
-                      content_type: response['content-type'],
-                      content_length: response['content-length'])
-          raise FetchFailed, 'redirect 先が不正です．'
-        end
-
-        redirect_url =
-            begin
-              URI.join(uri, location).to_s
-            rescue URI::InvalidURIError => e
-              log_failure(:invalid_redirect_location,
-                          url: uri.to_s,
-                          redirects:,
-                          location:,
-                          error: e.class.name,
-                          message: e.message)
-              raise FetchFailed, 'redirect 先が不正です．'
-            end
-
-        return fetch(redirect_url, max_bytes:, redirects: redirects - 1)
-      end
-
-      unless response.is_a?(Net::HTTPSuccess)
-        log_failure(:http_status,
-                    url: uri.to_s,
-                    code: response.code,
-                    content_type: response['content-type'],
-                    content_length: response['content-length'])
-        raise FetchFailed, "外部サーバーが HTTP #{ response.code } を返しました．"
-      end
-
-      Response.new(response.body, response['content-type'].to_s, uri.to_s)
-    rescue Net::OpenTimeout, Net::ReadTimeout, Timeout::Error => e
-      log_failure(:timeout, url: uri&.to_s || raw_url, error: e.class.name, message: e.message)
-      raise FetchTimeout, e.message
-    rescue SocketError, SystemCallError, OpenSSL::SSL::SSLError, EOFError => e
-      log_failure(:network_error,
-                  url: uri&.to_s || raw_url,
-                  error: e.class.name,
-                  message: e.message)
-      raise FetchFailed, e.message
-    end
-
-    def self.request(uri, ip_address, max_bytes)
-      http = Net::HTTP.new(uri.host, uri.port)
-      http.ipaddr = ip_address
-      http.use_ssl = uri.scheme == 'https'
-      http.open_timeout = 5
-      http.read_timeout = 8
-      http.write_timeout = 5
-
-      request = Net::HTTP::Get.new(uri)
-      request['User-Agent'] = 'BTRC-Hub thumbnail preview'
-      request['Accept'] = 'text/html,image/*;q=0.9,*/*;q=0.1'
-
-      http.request(request) do |response|
-        length = response['content-length'].to_i
-        if length > max_bytes
-          log_failure(:response_too_large,
-                      url: uri.to_s,
-                      content_type: response['content-type'],
-                      content_length: response['content-length'],
-                      max_bytes:)
-          raise ResponseTooLarge, '外部データが大きすぎます．'
-        end
-
-        body = +''
-        response.read_body do |chunk|
-          body << chunk
-          next unless body.bytesize > max_bytes
-
-          log_failure(:response_too_large,
-                      url: uri.to_s,
-                      content_type: response['content-type'],
-                      content_length: response['content-length'],
-                      bytes_read: body.bytesize,
-                      max_bytes:)
-          raise ResponseTooLarge, '外部データが大きすぎます．'
-        end
-        response.instance_variable_set(:@body, body)
-        response.instance_variable_set(:@read, true)
-        return response
-      end
-    end
-
-    def self.log_failure(reason, **payload)
-      Rails.logger.warn("preview_http_fetcher_failure #{ { reason:, **payload }.to_json }")
-    end
-
-    private_class_method :request, :log_failure
-  end
-end

backend/app/services/preview/known_site_extractor.rb

@@ -1,34 +0,0 @@
-module Preview
-  class KnownSiteExtractor
-    def self.thumbnail_url(uri)
-      youtube_thumbnail(uri)
-    end
-
-    def self.youtube_video_id(uri)
-      case uri.host&.downcase
-      when 'youtu.be'
-        uri.path.split('/').reject(&:blank?).first
-      when 'www.youtube.com', 'youtube.com', 'm.youtube.com'
-        uri.path == '/watch' ? URI.decode_www_form(uri.query.to_s).to_h['v'] : nil
-      end&.then { _1 if _1.match?(/\A[A-Za-z0-9_-]{6,20}\z/) }
-    end
-
-    def self.niconico_video_id(uri)
-      case uri.host&.downcase
-      when 'www.nicovideo.jp', 'nicovideo.jp'
-        uri.path[%r{\A/watch/(sm\d+)\z}, 1]
-      when 'nico.ms'
-        uri.path[%r{\A/(sm\d+)\z}, 1]
-      end
-    end
-
-    def self.youtube_thumbnail(uri)
-      id = youtube_video_id(uri)
-      return unless id
-
-      "https://i.ytimg.com/vi/#{ id }/hqdefault.jpg"
-    end
-
-    private_class_method :youtube_thumbnail
-  end
-end

backend/app/services/preview/thumbnail_fetcher.rb

@@ -1,95 +0,0 @@
-module Preview
-  class ThumbnailFetcher
-    class GenerationFailed < StandardError; end
-    ALLOWED_IMAGE_CONTENT_TYPES = [
-      'image/jpeg', 'image/png', 'image/gif', 'image/webp'
-    ].freeze
-    HTML_MAX_BYTES = 1.megabyte
-    NICONICO_XML_MAX_BYTES = 256.kilobytes
-
-    def self.fetch(raw_url)
-      uri, = UrlSafety.validate(raw_url)
-
-      known_url = KnownSiteExtractor.thumbnail_url(uri)
-      image = fetch_image_or_nil(known_url) if known_url
-      return image if image
-
-      niconico_url = niconico_thumbnail_url(uri)
-      image = fetch_image_or_nil(niconico_url) if niconico_url
-      return image if image
-
-      page = HttpFetcher.fetch(uri.to_s, max_bytes: HTML_MAX_BYTES)
-      metadata = HtmlMetadataExtractor.extract(page)
-      raise GenerationFailed, 'サムネール画像が見つかりませんでした．' if metadata[:image_url].blank?
-
-      fetch_image!(metadata[:image_url])
-    end
-
-    def self.title(raw_url)
-      uri, = UrlSafety.validate(raw_url)
-      HtmlMetadataExtractor.extract(
-          HttpFetcher.fetch(uri.to_s, max_bytes: HTML_MAX_BYTES))[:title]
-    end
-
-    def self.fetch_image_or_nil(url)
-      return nil if url.blank?
-
-      response = HttpFetcher.fetch(url)
-      return nil unless allowed_image_content_type?(response.content_type)
-
-      response.body
-    rescue HttpFetcher::FetchTimeout
-      raise
-    rescue HttpFetcher::FetchFailed
-      nil
-    end
-
-    def self.fetch_image!(url)
-      response = HttpFetcher.fetch(url)
-      unless allowed_image_content_type?(response.content_type)
-        raise GenerationFailed, 'サムネール画像が見つかりませんでした．'
-      end
-
-      response.body
-    rescue HttpFetcher::FetchTimeout
-      raise
-    rescue HttpFetcher::ResponseTooLarge
-      raise
-    rescue HttpFetcher::FetchFailed
-      raise GenerationFailed, 'サムネール画像を取得できませんでした．'
-    end
-
-    def self.niconico_thumbnail_url(uri)
-      video_id = KnownSiteExtractor.niconico_video_id(uri)
-      return nil if video_id.blank?
-
-      response = HttpFetcher.fetch("https://ext.nicovideo.jp/api/getthumbinfo/#{ video_id }",
-                                   max_bytes: NICONICO_XML_MAX_BYTES)
-      xml = Nokogiri::XML(response.body)
-      return nil unless xml.at_xpath('/nicovideo_thumb_response/@status')&.value == 'ok'
-
-      xml.at_xpath('//thumbnail_url')&.text&.strip.presence
-    rescue HttpFetcher::FetchFailed, HttpFetcher::FetchTimeout => e
-      Rails.logger.info("preview_niconico_getthumbinfo_fallback #{ { url: uri.to_s,
-                                                                     video_id:,
-                                                                     error: e.class.name,
-                                                                     message: e.message }.to_json }")
-      nil
-    rescue Nokogiri::XML::SyntaxError => e
-      Rails.logger.info("preview_niconico_getthumbinfo_fallback #{ { url: uri.to_s,
-                                                                     video_id:,
-                                                                     error: e.class.name,
-                                                                     message: e.message }.to_json }")
-      nil
-    end
-
-    def self.allowed_image_content_type?(content_type)
-      mime_type = content_type.to_s.split(';', 2).first.downcase.strip
-      ALLOWED_IMAGE_CONTENT_TYPES.include?(mime_type)
-    end
-
-    private_class_method :fetch_image_or_nil, :fetch_image!,
-                         :niconico_thumbnail_url,
-                         :allowed_image_content_type?
-  end
-end

backend/app/services/preview/url_safety.rb

@@ -1,55 +0,0 @@
-require 'resolv'
-require 'ipaddr'
-require 'uri'
-
-module Preview
-  class UrlSafety
-    class UnsafeUrl < StandardError; end
-
-    FORBIDDEN_NETWORKS = [
-      '0.0.0.0/8', '10.0.0.0/8', '100.64.0.0/10', '127.0.0.0/8',
-      '169.254.0.0/16', '172.16.0.0/12', '192.0.0.0/24',
-      '192.0.2.0/24', '192.168.0.0/16', '198.18.0.0/15',
-      '198.51.100.0/24', '203.0.113.0/24', '224.0.0.0/4',
-      '240.0.0.0/4', '::/128', '::1/128', 'fc00::/7', 'fe80::/10',
-      'ff00::/8', '2001:db8::/32', '::ffff:0:0/96'
-    ].map { IPAddr.new(_1) }.freeze
-
-    def self.validate(raw_url)
-      value = raw_url.to_s.strip
-      if value.match?(/\A[a-z][a-z0-9+\-.]*:/i)
-        unless value.match?(/\Ahttps?:\/\//i)
-          raise UnsafeUrl, 'http または https の URL を指定してください．'
-        end
-      else
-        value = "http://#{ value }"
-      end
-      uri = URI.parse(value)
-
-      unless ['http', 'https'].include?(uri.scheme&.downcase) && uri.host.present?
-        raise UnsafeUrl, 'http または https の URL を指定してください．'
-      end
-      raise UnsafeUrl, 'userinfo つき URL は使用できません．' if uri.userinfo.present?
-
-      addresses = Resolv.getaddresses(uri.host)
-      raise UnsafeUrl, 'URL のホストを解決できません．' if addresses.empty?
-
-      parsed_addresses = addresses.map { IPAddr.new(_1) }
-      if parsed_addresses.any? { |address| forbidden?(address) }
-        raise UnsafeUrl, '安全でない接続先は使用できません．'
-      end
-
-      [uri, parsed_addresses.map(&:to_s)]
-    rescue Resolv::ResolvError
-      raise UnsafeUrl, 'URL のホストを解決できません．'
-    rescue URI::InvalidURIError, IPAddr::InvalidAddressError
-      raise UnsafeUrl, 'URL が不正です．'
-    end
-
-    def self.forbidden?(address)
-      FORBIDDEN_NETWORKS.any? { _1.include?(address) }
-    end
-
-    private_class_method :forbidden?
-  end
-end

backend/app/services/version_recorder.rb

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

backend/config/routes.rb

@@ -33,12 +33,6 @@ Rails.application.routes.draw do
     get :thumbnail
   end
 
-  scope 'posts/import', controller: :post_imports do
-    post :preview
-    post :validate
-    post '', action: :create
-  end
-
   resources :wiki_pages, path: 'wiki', only: [:index, :show, :create, :update] do
     collection do
       get :search
@@ -87,11 +81,6 @@ Rails.application.routes.draw do
     end
   end
 
-  get 'users/settings', to: 'user_settings#show'
-  patch 'users/settings', to: 'user_settings#update'
-  get 'users/theme_slots', to: 'user_theme_slots#index'
-  put 'users/theme_slots/:base_theme/:slot_no', to: 'user_theme_slots#update'
-
   resources :users, only: [:create, :update] do
     collection do
       post :verify
@@ -124,8 +113,5 @@ Rails.application.routes.draw do
     resources :skip_events, controller: :theatre_skip_events, only: [:index]
   end
 
-  get 'materials/download.zip', to: 'materials#download'
-  get 'materials/versions', to: 'material_versions#index'
-  resources :material_sync_suppressions, path: 'materials/suppressions', only: [:index, :create]
   resources :materials, only: [:index, :show, :create, :update, :destroy]
 end

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

@@ -1,88 +0,0 @@
-class EnhanceMaterialManagement < ActiveRecord::Migration[8.0]
-  def up
-    change_table :materials, bulk: true do |t|
-      t.integer :version_no, null: false, default: 1
-    end
-
-    change_table :material_versions, bulk: true do |t|
-      t.string :event_type
-      t.string :tag_name
-      t.string :tag_category
-      t.json :export_paths_json
-      t.bigint :file_blob_id
-      t.string :file_filename
-      t.string :file_content_type
-      t.bigint :file_byte_size
-      t.string :file_checksum
-      t.string :file_sha256
-    end
-
-    execute <<~SQL.squish
-      UPDATE material_versions
-      SET event_type = CASE
-                       WHEN version_no = 1 THEN 'create'
-                       ELSE 'update'
-                       END
-      WHERE event_type IS NULL
-    SQL
-
-    change_column_null :material_versions, :event_type, false
-    add_index :material_versions, :file_blob_id
-
-    add_check_constraint :material_versions,
-                         "event_type IN ('create', 'update', 'discard', 'restore')",
-                         name: 'material_versions_event_type_valid'
-
-    create_table :material_export_items do |t|
-      t.references :material, null: false, foreign_key: true
-      t.string :profile, null: false, default: 'legacy_drive'
-      t.string :export_path, null: false
-      t.boolean :enabled, null: false, default: true
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.index [:profile, :export_path], unique: true
-      t.index [:material_id, :profile], unique: true
-    end
-
-    create_table :material_import_blocks do |t|
-      t.string :match_kind, null: false
-      t.string :sha256
-      t.string :external_path_pattern
-      t.string :reason, null: false
-      t.text :note
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-    end
-
-    execute <<~SQL.squish
-      UPDATE materials
-      SET version_no = COALESCE(
-        (SELECT MAX(material_versions.version_no)
-         FROM material_versions
-         WHERE material_versions.material_id = materials.id),
-        1)
-    SQL
-  end
-
-  def down
-    drop_table :material_import_blocks
-    drop_table :material_export_items
-
-    remove_check_constraint :material_versions, name: 'material_versions_event_type_valid'
-
-    remove_index :material_versions, :file_blob_id
-    remove_column :material_versions, :event_type
-    remove_column :material_versions, :tag_name
-    remove_column :material_versions, :tag_category
-    remove_column :material_versions, :export_paths_json
-    remove_column :material_versions, :file_blob_id
-    remove_column :material_versions, :file_filename
-    remove_column :material_versions, :file_content_type
-    remove_column :material_versions, :file_byte_size
-    remove_column :material_versions, :file_checksum
-    remove_column :material_versions, :file_sha256
-
-    remove_column :materials, :version_no
-  end
-end

backend/db/migrate/20260625000000_reconcile_material_sync_suppressions.rb

@@ -1,118 +0,0 @@
-class ReconcileMaterialSyncSuppressions < ActiveRecord::Migration[8.0]
-  MATERIAL_VERSION_EVENT_CONSTRAINT = 'material_versions_event_type_valid'
-
-  def up
-    ensure_material_sync_suppressions!
-    ensure_material_source_columns!
-    ensure_material_active_source_key!
-    remove_material_file_suppression!
-    remove_material_version_file_suppression!
-    reconcile_material_version_event_constraint!
-  end
-
-  def down
-    raise ActiveRecord::IrreversibleMigration
-  end
-
-  private
-
-  def ensure_material_sync_suppressions!
-    return if table_exists?(:material_sync_suppressions)
-
-    create_table :material_sync_suppressions do |t|
-      t.string :source_kind, null: false
-      t.string :source_uri
-      t.string :drive_path
-      t.string :drive_file_id
-      t.string :normalized_source_key, null: false
-      t.string :reason, null: false
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.index :normalized_source_key, unique: true
-      t.index :source_kind
-      t.index :drive_file_id
-    end
-  end
-
-  def ensure_material_source_columns!
-    add_column :materials, :source_kind, :string unless column_exists?(:materials, :source_kind)
-    add_column :materials, :source_uri, :string unless column_exists?(:materials, :source_uri)
-    add_column :materials, :source_path, :string unless column_exists?(:materials, :source_path)
-    unless column_exists?(:materials, :source_file_id)
-      add_column :materials, :source_file_id, :string
-    end
-    unless column_exists?(:materials, :normalized_source_key)
-      add_column :materials, :normalized_source_key, :string
-    end
-
-    if index_exists?(:materials, :normalized_source_key)
-      remove_index :materials, column: :normalized_source_key
-    end
-  end
-
-  def ensure_material_active_source_key!
-    unless column_exists?(:materials, :active_normalized_source_key)
-      change_table :materials do |t|
-        t.virtual :active_normalized_source_key,
-                  type: :string,
-                  as: 'IF(discarded_at IS NULL, normalized_source_key, NULL)',
-                  stored: false
-      end
-    end
-
-    return if index_exists?(:materials,
-                            :active_normalized_source_key,
-                            name: 'index_materials_on_active_normalized_source_key')
-
-    add_index :materials,
-              :active_normalized_source_key,
-              unique: true,
-              name: 'index_materials_on_active_normalized_source_key'
-  end
-
-  def remove_material_file_suppression!
-    if foreign_key_exists?(:materials, :users, column: :file_suppressed_by_user_id)
-      remove_foreign_key :materials, column: :file_suppressed_by_user_id
-    end
-
-    if index_exists?(:materials,
-                    :file_suppressed_by_user_id,
-                    name: 'index_materials_on_file_suppressed_by_user_id')
-      remove_index :materials, name: 'index_materials_on_file_suppressed_by_user_id'
-    end
-
-    remove_column :materials, :file_suppressed_at if column_exists?(
-        :materials,
-        :file_suppressed_at)
-    remove_column :materials, :file_suppressed_by_user_id if column_exists?(
-        :materials,
-        :file_suppressed_by_user_id)
-    remove_column :materials, :file_suppression_reason if column_exists?(
-        :materials,
-        :file_suppression_reason)
-  end
-
-  def remove_material_version_file_suppression!
-    remove_column :material_versions, :file_suppressed_at if column_exists?(
-        :material_versions,
-        :file_suppressed_at)
-    remove_column :material_versions, :file_suppression_reason if column_exists?(
-        :material_versions,
-        :file_suppression_reason)
-  end
-
-  def reconcile_material_version_event_constraint!
-    constraint = check_constraints(:material_versions).find do |candidate|
-      candidate.name == MATERIAL_VERSION_EVENT_CONSTRAINT
-    end
-    return if constraint && !constraint.expression.include?('suppress')
-
-    if constraint
-      remove_check_constraint :material_versions, name: MATERIAL_VERSION_EVENT_CONSTRAINT
-    end
-    add_check_constraint :material_versions,
-                         "event_type IN ('create', 'update', 'discard', 'restore')",
-                         name: MATERIAL_VERSION_EVENT_CONSTRAINT
-  end
-end

backend/db/migrate/20260625010000_create_material_sync_sources.rb

@@ -1,22 +0,0 @@
-class CreateMaterialSyncSources < ActiveRecord::Migration[8.0]
-  def change
-    create_table :material_sync_sources do |t|
-      t.string :name, null: false
-      t.string :source_kind, null: false
-      t.string :source_uri
-      t.string :source_path
-      t.string :source_file_id
-      t.string :profile, null: false, default: 'legacy_drive'
-      t.boolean :enabled, null: false, default: true
-      t.string :default_tag_name
-      t.string :export_path_prefix
-      t.datetime :last_synced_at
-      t.references :created_by_user, foreign_key: { to_table: :users }
-      t.references :updated_by_user, foreign_key: { to_table: :users }
-      t.timestamps
-
-      t.index :enabled
-      t.index :source_kind
-    end
-  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/migrate/20260704000000_rebuild_settings_as_typed_user_settings.rb

@@ -1,31 +0,0 @@
-class RebuildSettingsAsTypedUserSettings < ActiveRecord::Migration[8.0]
-  def change
-    remove_foreign_key :settings, :users if foreign_key_exists?(:settings, :users)
-    remove_index :settings, :user_id if index_exists?(:settings, :user_id)
-
-    remove_column :settings, :key, :string if column_exists?(:settings, :key)
-    remove_column :settings, :value, :json if column_exists?(:settings, :value)
-
-    change_column_null :settings, :user_id, false
-
-    add_column :settings, :theme, :string, null: false, default: 'system'
-    add_column :settings,
-               :auto_fetch_title,
-               :string,
-               null: false,
-               default: 'manual'
-    add_column :settings,
-               :auto_fetch_thumbnail,
-               :string,
-               null: false,
-               default: 'manual'
-    add_column :settings,
-               :wiki_editor_mode,
-               :string,
-               null: false,
-               default: 'split'
-
-    add_index :settings, :user_id, unique: true
-    add_foreign_key :settings, :users
-  end
-end

backend/db/migrate/20260705000000_create_user_theme_slots.rb

@@ -1,22 +0,0 @@
-class CreateUserThemeSlots < ActiveRecord::Migration[8.0]
-  def change
-    create_table :user_theme_slots do |t|
-      t.references :user, null: false, foreign_key: true
-      t.string :base_theme, null: false
-      t.integer :slot_no, null: false
-      t.json :tokens, null: false
-      t.timestamps
-    end
-
-    add_index :user_theme_slots,
-              [:user_id, :base_theme, :slot_no],
-              unique: true,
-              name: 'index_user_theme_slots_on_user_theme_and_slot'
-    add_check_constraint :user_theme_slots,
-                         "base_theme IN ('light', 'dark')",
-                         name: 'user_theme_slots_base_theme_valid'
-    add_check_constraint :user_theme_slots,
-                         'slot_no BETWEEN 1 AND 3',
-                         name: 'user_theme_slots_slot_no_valid'
-  end
-end

backend/db/migrate/20260713000000_create_post_url_sanitisation_rules.rb

@@ -1,61 +0,0 @@
-class CreatePostUrlSanitisationRules < ActiveRecord::Migration[8.0]
-  class PostUrlSanitisationRule < ActiveRecord::Base
-    self.table_name = 'post_url_sanitisation_rules'
-  end
-
-  def up
-    create_table :post_url_sanitisation_rules, id: :integer, primary_key: :priority do |t|
-      t.string :source_pattern, null: false
-      t.string :replacement, null: false
-      t.timestamps
-      t.datetime :discarded_at
-
-      t.index :source_pattern, unique: true
-      t.index :discarded_at
-    end
-
-    now = Time.current
-
-    PostUrlSanitisationRule.insert_all!([
-        { priority: 10,
-          source_pattern: '\Ahttps?://youtu\.be/([^/?#]+)(?:[?#].*)?\z',
-          replacement: 'https://www.youtube.com/watch?v=\1',
-          created_at: now,
-          updated_at: now },
-        { priority: 20,
-          source_pattern: '\Ahttps?://(?:www\.|m\.)?youtube\.com/live/([^/?#]+)(?:[?#].*)?\z',
-          replacement: 'https://www.youtube.com/watch?v=\1',
-          created_at: now,
-          updated_at: now },
-        { priority: 30,
-          source_pattern: '\Ahttps?://(?:www\.|m\.)?youtube\.com/shorts/([^/?#]+)(?:[?#].*)?\z',
-          replacement: 'https://www.youtube.com/watch?v=\1',
-          created_at: now,
-          updated_at: now },
-        { priority: 40,
-          source_pattern: '\Ahttps?://(?:www\.|m\.)?youtube\.com/embed/([^/?#]+)(?:[?#].*)?\z',
-          replacement: 'https://www.youtube.com/watch?v=\1',
-          created_at: now,
-          updated_at: now },
-        { priority: 50,
-          source_pattern:
-              '\Ahttps?://(?:www\.|m\.)?youtube\.com/watch\?(?:[^#&]+&)*v=([^&#]+)(?:[&#].*)?\z',
-          replacement: 'https://www.youtube.com/watch?v=\1',
-          created_at: now,
-          updated_at: now },
-        { priority: 60,
-          source_pattern: '\Ahttps?://nico\.ms/([^/?#]+)(?:[?#].*)?\z',
-          replacement: 'https://www.nicovideo.jp/watch/\1',
-          created_at: now,
-          updated_at: now },
-        { priority: 70,
-          source_pattern: '\Ahttps?://(?:www\.)?nicovideo\.jp/watch/([^?#/]+)(?:[?#].*)?\z',
-          replacement: 'https://www.nicovideo.jp/watch/\1',
-          created_at: now,
-          updated_at: now }])
-  end
-
-  def down
-    drop_table :post_url_sanitisation_rules
-  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_07_13_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_06_21_000000) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -130,69 +130,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     t.index ["ip_address"], name: "index_ip_addresses_on_ip_address", unique: true
   end
 
-  create_table "material_export_items", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "material_id", null: false
-    t.string "profile", default: "legacy_drive", null: false
-    t.string "export_path", null: false
-    t.boolean "enabled", default: true, null: false
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_material_export_items_on_created_by_user_id"
-    t.index ["material_id", "profile"], name: "index_material_export_items_on_material_id_and_profile", unique: true
-    t.index ["material_id"], name: "index_material_export_items_on_material_id"
-    t.index ["profile", "export_path"], name: "index_material_export_items_on_profile_and_export_path", unique: true
-  end
-
-  create_table "material_import_blocks", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "match_kind", null: false
-    t.string "sha256"
-    t.string "external_path_pattern"
-    t.string "reason", null: false
-    t.text "note"
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_material_import_blocks_on_created_by_user_id"
-  end
-
-  create_table "material_sync_sources", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "name", null: false
-    t.string "source_kind", null: false
-    t.string "source_uri"
-    t.string "source_path"
-    t.string "source_file_id"
-    t.string "profile", default: "legacy_drive", null: false
-    t.boolean "enabled", default: true, null: false
-    t.string "default_tag_name"
-    t.string "export_path_prefix"
-    t.datetime "last_synced_at"
-    t.bigint "created_by_user_id"
-    t.bigint "updated_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_material_sync_sources_on_created_by_user_id"
-    t.index ["enabled"], name: "index_material_sync_sources_on_enabled"
-    t.index ["source_kind"], name: "index_material_sync_sources_on_source_kind"
-    t.index ["updated_by_user_id"], name: "index_material_sync_sources_on_updated_by_user_id"
-  end
-
-  create_table "material_sync_suppressions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "source_kind", null: false
-    t.string "source_uri"
-    t.string "drive_path"
-    t.string "drive_file_id"
-    t.string "normalized_source_key", null: false
-    t.string "reason", null: false
-    t.bigint "created_by_user_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["created_by_user_id"], name: "index_material_sync_suppressions_on_created_by_user_id"
-    t.index ["drive_file_id"], name: "index_material_sync_suppressions_on_drive_file_id"
-    t.index ["normalized_source_key"], name: "index_material_sync_suppressions_on_normalized_source_key", unique: true
-    t.index ["source_kind"], name: "index_material_sync_suppressions_on_source_kind"
-  end
-
   create_table "material_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "material_id", null: false
     t.integer "version_no", null: false
@@ -204,31 +141,14 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
-    t.string "event_type", null: false
-    t.string "tag_name"
-    t.string "tag_category"
-    t.json "export_paths_json"
-    t.bigint "file_blob_id"
-    t.string "file_filename"
-    t.string "file_content_type"
-    t.bigint "file_byte_size"
-    t.string "file_checksum"
-    t.string "file_sha256"
-    t.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"
     t.index ["material_id", "version_no"], name: "index_material_versions_on_material_id_and_version_no", unique: true
     t.index ["material_id"], name: "index_material_versions_on_material_id"
     t.index ["parent_id"], name: "index_material_versions_on_parent_id"
     t.index ["tag_id"], name: "index_material_versions_on_tag_id"
     t.index ["updated_by_user_id"], name: "index_material_versions_on_updated_by_user_id"
     t.index ["url"], name: "index_material_versions_on_url"
-    t.check_constraint "`event_type` in (_utf8mb4'create',_utf8mb4'update',_utf8mb4'discard',_utf8mb4'restore')", name: "material_versions_event_type_valid"
   end
 
   create_table "materials", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -241,14 +161,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
     t.virtual "active_url", type: :string, as: "if((`discarded_at` is null),`url`,NULL)"
-    t.integer "version_no", default: 1, null: false
-    t.string "source_kind"
-    t.string "source_uri"
-    t.string "source_path"
-    t.string "source_file_id"
-    t.string "normalized_source_key"
-    t.virtual "active_normalized_source_key", type: :string, as: "if((`discarded_at` is null),`normalized_source_key`,NULL)"
-    t.index ["active_normalized_source_key"], name: "index_materials_on_active_normalized_source_key", unique: true
     t.index ["active_url"], name: "index_materials_on_active_url", unique: true
     t.index ["created_by_user_id"], name: "index_materials_on_created_by_user_id"
     t.index ["discarded_at"], name: "index_materials_on_discarded_at"
@@ -298,19 +210,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     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
@@ -331,16 +230,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     t.index ["tag_id"], name: "index_post_tags_on_tag_id"
   end
 
-  create_table "post_url_sanitisation_rules", primary_key: "priority", id: :integer, charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.string "source_pattern", null: false
-    t.string "replacement", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.datetime "discarded_at"
-    t.index ["discarded_at"], name: "index_post_url_sanitisation_rules_on_discarded_at"
-    t.index ["source_pattern"], name: "index_post_url_sanitisation_rules_on_source_pattern", unique: true
-  end
-
   create_table "post_versions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "post_id", null: false
     t.integer "version_no", null: false
@@ -354,12 +243,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) 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
@@ -374,36 +260,18 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) 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|
     t.bigint "user_id", null: false
+    t.string "key", null: false
+    t.json "value", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.string "theme", default: "system", null: false
+    t.index ["user_id"], name: "index_settings_on_user_id"
-    t.string "auto_fetch_title", default: "manual", null: false
-    t.string "auto_fetch_thumbnail", default: "manual", null: false
-    t.string "wiki_editor_mode", default: "split", null: false
-    t.index ["user_id"], name: "index_settings_on_user_id", unique: true
-  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 "tag_implications", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
@@ -451,9 +319,9 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     t.string "event_type", null: false
     t.string "name", null: false
     t.string "category", null: false
+    t.datetime "deprecated_at"
     t.text "aliases", null: false
     t.text "parent_tag_ids", null: false
-    t.datetime "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"
@@ -466,10 +334,10 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
   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"
@@ -591,19 +459,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
     t.index ["post_id"], name: "index_user_post_views_on_post_id"
   end
 
-  create_table "user_theme_slots", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
-    t.bigint "user_id", null: false
-    t.string "base_theme", null: false
-    t.integer "slot_no", null: false
-    t.json "tokens", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["user_id", "base_theme", "slot_no"], name: "index_user_theme_slots_on_user_theme_and_slot", unique: true
-    t.index ["user_id"], name: "index_user_theme_slots_on_user_id"
-    t.check_constraint "`base_theme` in (_utf8mb4'light',_utf8mb4'dark')", name: "user_theme_slots_base_theme_valid"
-    t.check_constraint "`slot_no` between 1 and 3", name: "user_theme_slots_slot_no_valid"
-  end
-
   create_table "users", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name"
     t.string "inheritance_code", limit: 64, null: false
@@ -614,6 +469,19 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) 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
@@ -699,12 +567,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
   add_foreign_key "gekanator_question_suggestions", "users"
   add_foreign_key "gekanator_questions", "gekanator_question_suggestions"
   add_foreign_key "gekanator_questions", "users", column: "created_by_id"
-  add_foreign_key "material_export_items", "materials"
-  add_foreign_key "material_export_items", "users", column: "created_by_user_id"
-  add_foreign_key "material_import_blocks", "users", column: "created_by_user_id"
-  add_foreign_key "material_sync_sources", "users", column: "created_by_user_id"
-  add_foreign_key "material_sync_sources", "users", column: "updated_by_user_id"
-  add_foreign_key "material_sync_suppressions", "users", column: "created_by_user_id"
   add_foreign_key "material_versions", "materials"
   add_foreign_key "material_versions", "materials", column: "parent_id"
   add_foreign_key "material_versions", "tags"
@@ -722,8 +584,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) 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"
@@ -763,7 +623,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_13_000000) do
   add_foreign_key "user_ips", "users"
   add_foreign_key "user_post_views", "posts"
   add_foreign_key "user_post_views", "users"
-  add_foreign_key "user_theme_slots", "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"

backend/db/seeds.rb

@@ -7,58 +7,3 @@
 #   ["Action", "Comedy", "Drama", "Horror"].each do |genre_name|
 #     MovieGenre.find_or_create_by!(name: genre_name)
 #   end
-
-post_url_sanitisation_rules = [
-  { priority: 10,
-    source_pattern: '\Ahttps?://youtu\.be/([^/?#]+)(?:[?#].*)?\z',
-    replacement: 'https://www.youtube.com/watch?v=\1' },
-  { priority: 20,
-    source_pattern: '\Ahttps?://(?:www\.|m\.)?youtube\.com/live/([^/?#]+)(?:[?#].*)?\z',
-    replacement: 'https://www.youtube.com/watch?v=\1' },
-  { priority: 30,
-    source_pattern: '\Ahttps?://(?:www\.|m\.)?youtube\.com/shorts/([^/?#]+)(?:[?#].*)?\z',
-    replacement: 'https://www.youtube.com/watch?v=\1' },
-  { priority: 40,
-    source_pattern: '\Ahttps?://(?:www\.|m\.)?youtube\.com/embed/([^/?#]+)(?:[?#].*)?\z',
-    replacement: 'https://www.youtube.com/watch?v=\1' },
-  { priority: 50,
-    source_pattern:
-        '\Ahttps?://(?:www\.|m\.)?youtube\.com/watch\?(?:[^#&]+&)*v=([^&#]+)(?:[&#].*)?\z',
-    replacement: 'https://www.youtube.com/watch?v=\1' },
-  { priority: 60,
-    source_pattern: '\Ahttps?://nico\.ms/([^/?#]+)(?:[?#].*)?\z',
-    replacement: 'https://www.nicovideo.jp/watch/\1' },
-  { priority: 70,
-    source_pattern: '\Ahttps?://(?:www\.)?nicovideo\.jp/watch/([^?#/]+)(?:[?#].*)?\z',
-    replacement: 'https://www.nicovideo.jp/watch/\1' }
-]
-
-post_url_sanitisation_rule_scope = PostUrlSanitisationRule.unscoped
-
-post_url_sanitisation_rules.each do |attributes|
-  priority = attributes.fetch(:priority)
-  source_pattern = attributes.fetch(:source_pattern)
-
-  next if post_url_sanitisation_rule_scope.exists?(priority:)
-  next if post_url_sanitisation_rule_scope.exists?(source_pattern:)
-
-  post_url_sanitisation_rule_scope.create!(attributes)
-end
-
-material_sync_source_uri = ENV['MATERIAL_SYNC_SOURCE_URI']
-material_sync_source_file_id = ENV['MATERIAL_SYNC_SOURCE_FILE_ID']
-
-if material_sync_source_uri.present? || material_sync_source_file_id.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,
-      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'],
-      export_path_prefix: ENV['MATERIAL_SYNC_EXPORT_PATH_PREFIX'])
-  source.save!
-end

backend/lib/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "lib",
+  "version": "1.0.0",
+  "main": "screenshot.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "puppeteer": "^24.10.0"
+  }
+}

backend/lib/screenshot.js

@@ -0,0 +1,18 @@
+const puppeteer = require ('puppeteer')
+const fs = require ('fs')
+
+
+void (async () => {
+  const url = process.argv[2]
+  const output = process.argv[3]
+
+  const browser = await puppeteer.launch ({
+      args: ['--no-sandbox', '--disable-setuid-sandbox'] })
+
+  const page = await browser.newPage ()
+  await page.setViewport ({ width: 960, height: 960 })
+  await page.goto (url, { waitUntil: 'networkidle2', timeout: 15000 })
+
+  await page.screenshot ({ path: output })
+  await browser.close ()
+}) ()

backend/lib/tasks/sync_materials.rake

@@ -1,51 +0,0 @@
-namespace :materials do
-  desc '素材同期'
-  task sync: :environment do
-    result = MaterialSyncRunner.sync_enabled!
-    message = [
-      "materials:sync imported=#{ result.imported }",
-      "updated=#{ result.updated }",
-      "unchanged=#{ result.unchanged }",
-      "suppressed=#{ result.suppressed }",
-      "failed=#{ result.failed }"
-    ].join(' ')
-
-    Rails.logger.info(message)
-    puts message
-
-    result.errors.each do |error|
-      Rails.logger.warn(error.to_json)
-      warn error.to_json
-    end
-  end
-
-  namespace :thumbnails do
-    desc '素材サムネールを補完'
-    task backfill: :environment do
-      counts = Hash.new(0)
-
-      Material
-        .with_attached_file
-        .with_attached_thumbnail
-        .find_each do |material|
-          next unless material.file.attached?
-          next if material.thumbnail.attached?
-
-          result = MaterialThumbnailGenerator.generate!(material)
-          counts[result] += 1
-        end
-
-      message =
-          "materials:thumbnails:backfill " \
-          "attached=#{ counts[:attached] } " \
-          "no_file=#{ counts[:no_file] } " \
-          "unsupported_content_type=#{ counts[:unsupported_content_type] } " \
-          "generation_failed=#{ counts[:generation_failed] } " \
-          "attach_failed=#{ counts[:attach_failed] } " \
-          "file_not_found=#{ counts[:file_not_found] } " \
-          "mini_magick_error=#{ counts[:mini_magick_error] }"
-      Rails.logger.info(message)
-      puts message
-    end
-  end
-end

backend/spec/db/seeds_spec.rb

@@ -1,65 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'database seeds' do
-  before do
-    PostUrlSanitisationRule.unscoped.delete_all
-  end
-
-  it 'registers the initial post URL sanitisation rules' do
-    load_seeds
-
-    urls = {
-      'https://youtu.be/abc123?si=share' => youtube_url('abc123'),
-      'https://www.youtube.com/live/abc123?t=10' => youtube_url('abc123'),
-      'https://youtube.com/shorts/abc123?feature=share' => youtube_url('abc123'),
-      'https://m.youtube.com/embed/abc123' => youtube_url('abc123'),
-      'https://youtube.com/watch?feature=share&v=abc123&t=10' => youtube_url('abc123'),
-      'https://nico.ms/sm123?from=share#fragment' => nico_url('sm123'),
-      'https://www.nicovideo.jp/watch/sm123?ref=share#fragment' => nico_url('sm123')
-    }
-
-    expect(PostUrlSanitisationRule.count).to eq(7)
-    urls.each do |url, canonical_url|
-      expect(PostUrlSanitisationRule.sanitise(url)).to eq(canonical_url)
-    end
-  end
-
-  it 'does not overwrite or restore an existing rule' do
-    rule = PostUrlSanitisationRule.create!(
-      priority: 10,
-      source_pattern: '\Ahttps://example\.com/custom\z',
-      replacement: 'https://example.com/replacement'
-    )
-    rule.discard!
-    original_attributes = rule.reload.attributes
-
-    2.times { load_seeds }
-
-    persisted_rule = PostUrlSanitisationRule.unscoped.find(10)
-    expect(persisted_rule.attributes).to eq(original_attributes)
-    expect(PostUrlSanitisationRule.unscoped.count).to eq(7)
-  end
-
-  it 'does not duplicate a rule moved to another priority' do
-    source_pattern = '\Ahttps?://youtu\.be/([^/?#]+)(?:[?#].*)?\z'
-    PostUrlSanitisationRule.create!(
-      priority: 80,
-      source_pattern:,
-      replacement: 'https://example.com/custom/\1'
-    )
-
-    load_seeds
-
-    rules = PostUrlSanitisationRule.unscoped
-    expect(rules.where(source_pattern:).count).to eq(1)
-    expect(rules.find(80).replacement).to eq('https://example.com/custom/\1')
-  end
-
-  def load_seeds
-    load Rails.root.join('db/seeds.rb')
-  end
-
-  def youtube_url(video_id) = "https://www.youtube.com/watch?v=#{ video_id }"
-
-  def nico_url(video_id) = "https://www.nicovideo.jp/watch/#{ video_id }"
-end

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_export_item_spec.rb

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

backend/spec/models/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_spec.rb

@@ -1,68 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Post, type: :model do
-  before do
-    PostUrlSanitisationRule.unscoped.delete_all
-  end
-
-  describe 'URL normalisation' do
-    it 'normalises the HTTP URL before applying sanitisation rules' do
-      PostUrlSanitisationRule.create!(
-        priority: 10,
-        source_pattern: '\\Ahttps://example\\.com/videos/([^/]+)\\z',
-        replacement: 'https://example.com/watch/\\1'
-      )
-
-      post = described_class.create!(
-        title: 'normalised URL',
-        url: '  https://EXAMPLE.com/videos/123/  '
-      )
-
-      expect(post.url).to eq('https://example.com/watch/123')
-    end
-
-    it 'does not normalise an unchanged URL when another attribute changes' do
-      post = create(:post)
-      post.update_column(:url, 'https://EXAMPLE.com/unchanged/')
-
-      post.update!(title: 'updated title')
-
-      expect(post.reload.url).to eq('https://EXAMPLE.com/unchanged/')
-    end
-
-    it 'validates the sanitised URL length' do
-      path = 'a' * 375
-
-      PostUrlSanitisationRule.create!(
-        priority: 10,
-        source_pattern: '\\Ahttps://example\\.com/(a+)\\z',
-        replacement: 'https://example.com/\\1\\1'
-      )
-
-      post = described_class.new(
-        title: 'long URL',
-        url: "https://example.com/#{ path }"
-      )
-
-      expect(post).to be_invalid
-      expect(post.errors.details.fetch(:url)).to include(
-        error: :too_long,
-        count: 768
-      )
-    end
-
-    it 'validates uniqueness after sanitisation' do
-      PostUrlSanitisationRule.create!(
-        priority: 10,
-        source_pattern: '\\Ahttps://example\\.com/alias\\z',
-        replacement: 'https://example.com/canonical'
-      )
-      create(:post, url: 'https://example.com/canonical')
-
-      post = described_class.new(title: 'duplicate URL', url: 'https://example.com/alias')
-
-      expect(post).to be_invalid
-      expect(post.errors.details.fetch(:url)).to include(error: :taken, value: post.url)
-    end
-  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/post_url_sanitisation_rule_spec.rb

@@ -1,265 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe PostUrlSanitisationRule, type: :model do
-  before do
-    described_class.unscoped.delete_all
-  end
-
-  describe 'validations' do
-    it 'requires a source pattern' do
-      rule = described_class.new(priority: 10, source_pattern: nil, replacement: '')
-
-      expect(rule).to be_invalid
-      expect(rule.errors.details.fetch(:source_pattern)).to eq([{ error: :blank }])
-    end
-
-    it 'requires a unique source pattern' do
-      described_class.create!(priority: 10, source_pattern: 'source', replacement: 'first')
-      rule = described_class.new(
-        priority: 20,
-        source_pattern: 'source',
-        replacement: 'second'
-      )
-
-      expect(rule).to be_invalid
-      expect(rule.errors.details.fetch(:source_pattern)).to include(
-        error: :taken,
-        value: 'source'
-      )
-    end
-
-    it 'rejects an invalid regexp' do
-      rule = described_class.new(priority: 10, source_pattern: '[', replacement: '')
-
-      expect(rule).to be_invalid
-      expect(rule.errors[:source_pattern]).to include('変な正規表現だね〜（笑）')
-    end
-  end
-
-  describe '.sanitise' do
-    it 'applies each active rule once in priority order' do
-      described_class.create!(priority: 30, source_pattern: 'c', replacement: 'd')
-      described_class.create!(priority: 10, source_pattern: 'a', replacement: 'aa')
-      described_class.create!(priority: 20, source_pattern: 'aa', replacement: 'c')
-      discarded = described_class.create!(
-        priority: 5,
-        source_pattern: '.',
-        replacement: 'discarded'
-      )
-      discarded.discard!
-
-      expect(described_class.sanitise('a')).to eq('d')
-    end
-
-    it 'canonicalises the initial YouTube and Nico URL forms' do
-      create_initial_rules
-
-      urls = {
-        'https://youtu.be/abc123?si=share' => youtube_url('abc123'),
-        'https://www.youtube.com/live/abc123?t=10' => youtube_url('abc123'),
-        'https://youtube.com/shorts/abc123?feature=share' => youtube_url('abc123'),
-        'https://m.youtube.com/embed/abc123' => youtube_url('abc123'),
-        'https://youtube.com/watch?feature=share&v=abc123&t=10' => youtube_url('abc123'),
-        'https://nico.ms/sm123?from=share#fragment' => nico_url('sm123'),
-        'https://www.nicovideo.jp/watch/sm123?ref=share#fragment' => nico_url('sm123')
-      }
-
-      urls.each do |url, canonical_url|
-        expect(described_class.sanitise(url)).to eq(canonical_url)
-      end
-    end
-  end
-
-  describe '.apply!' do
-    it 'locks posts in ID order and updates through temporary URLs' do
-      first = create(:post, url: 'https://example.com/source/1')
-      second = create(:post, url: 'https://example.com/source/2')
-      create_source_rule
-      sql = capture_sql { described_class.apply! }
-
-      lock_sql = sql.find { _1.match?(/SELECT .*posts.*FOR UPDATE/i) }
-      expect(lock_sql).to match(/ORDER BY .*posts.*id.* ASC/i)
-      expect(sql.grep(/post-url-sanitising\.invalid/).size).to eq(2)
-      expect(first.reload.url).to eq('https://example.com/canonical/1')
-      expect(second.reload.url).to eq('https://example.com/canonical/2')
-    end
-
-    it 'loads and compiles rules only once' do
-      create(:post, url: 'https://example.com/source/1')
-      create(:post, url: 'https://example.com/source/2')
-      create_source_rule
-
-      expect(described_class).to receive(:rules).once.and_call_original
-
-      described_class.apply!
-    end
-
-    it 'does not change post versions, version_no, or updated_at' do
-      post = create(:post, url: 'https://example.com/source/1')
-      post.update_columns(version_no: 7, updated_at: 1.day.ago)
-      original_updated_at = post.reload.updated_at
-      create_source_rule
-
-      expect { described_class.apply! }.not_to change(PostVersion, :count)
-
-      post.reload
-      expect(post.url).to eq('https://example.com/canonical/1')
-      expect(post.version_no).to eq(7)
-      expect(post.updated_at).to eq(original_updated_at)
-    end
-
-    invalid_urls = {
-      'a blank URL' => '',
-      'an unparseable URL' => 'https://[',
-      'a non-HTTP URL' => 'ftp://example.com/file',
-      'an HTTP URL without a host' => 'https:/path'
-    }
-
-    invalid_urls.each do |description, sanitised_url|
-      it "rolls back every update when sanitisation produces #{ description }" do
-        valid_post = create(:post, url: 'https://example.com/source/1')
-        invalid_post = create(:post, url: 'https://example.com/invalid')
-        create_source_rule
-        described_class.create!(
-          priority: 20,
-          source_pattern: '\\Ahttps://example\\.com/invalid\\z',
-          replacement: sanitised_url
-        )
-
-        expect { described_class.apply! }
-            .to raise_error(described_class::InvalidUrlError) { |error|
-          expect(error.invalid_rows).to eq([
-            { post_id: invalid_post.id,
-              original_url: 'https://example.com/invalid',
-              sanitised_url: }
-          ])
-        }
-        expect(valid_post.reload.url).to eq('https://example.com/source/1')
-        expect(invalid_post.reload.url).to eq('https://example.com/invalid')
-      end
-    end
-
-    it 'rolls back every update when sanitisation produces a URL longer than 768 characters' do
-      path = 'a' * 375
-      original_url = "https://example.com/#{ path }"
-      sanitised_url = "https://example.com/#{ path }#{ path }"
-      valid_post = create(:post, url: 'https://example.com/source/1')
-      invalid_post = create(:post, url: original_url)
-      create_source_rule
-      described_class.create!(
-        priority: 20,
-        source_pattern: '\\Ahttps://example\\.com/(a+)\\z',
-        replacement: 'https://example.com/\\1\\1'
-      )
-
-      expect { described_class.apply! }
-          .to raise_error(described_class::InvalidUrlError) { |error|
-        expect(error.invalid_rows).to eq([
-          { post_id: invalid_post.id,
-            original_url:,
-            sanitised_url: }
-        ])
-      }
-      expect(valid_post.reload.url).to eq('https://example.com/source/1')
-      expect(invalid_post.reload.url).to eq(original_url)
-    end
-
-    it 'rejects sanitised URL collisions case-insensitively without changing posts' do
-      source = create(:post, url: 'https://example.com/source/Foo')
-      canonical = create(:post, url: 'https://example.com/canonical/foo')
-      create_source_rule
-
-      expect { described_class.apply! }
-          .to raise_error(described_class::UrlConflictError) { |error|
-        expect(error.conflicts).to contain_exactly(
-          { url: 'https://example.com/canonical/Foo',
-            post_id: source.id,
-            original_url: 'https://example.com/source/Foo' },
-          { url: 'https://example.com/canonical/foo',
-            post_id: canonical.id,
-            original_url: 'https://example.com/canonical/foo' }
-        )
-      }
-      expect(source.reload.url).to eq('https://example.com/source/Foo')
-      expect(canonical.reload.url).to eq('https://example.com/canonical/foo')
-      expect(Post.count).to eq(2)
-    end
-
-    it 'converts a persisted URL constraint race into UrlConflictError' do
-      post = create(:post, url: 'https://example.com/source/1')
-      create_source_rule
-      conflict = { url: 'https://example.com/canonical/1',
-                   post_id: post.id,
-                   original_url: post.url }
-      database_error = ActiveRecord::RecordNotUnique.new('duplicate URL')
-      allow_any_instance_of(ActiveRecord::Relation)
-          .to receive(:update_all).and_raise(database_error)
-      allow(described_class).to receive(:build_persisted_conflicts).and_return([conflict])
-
-      expect { described_class.apply! }
-          .to raise_error(described_class::UrlConflictError) { |error|
-        expect(error.conflicts).to eq([conflict])
-        expect(error.cause).to equal(database_error)
-      }
-      expect(post.reload.url).to eq('https://example.com/source/1')
-    end
-
-    it 're-raises an unidentified RecordNotUnique error' do
-      post = create(:post, url: 'https://example.com/source/1')
-      create_source_rule
-      database_error = ActiveRecord::RecordNotUnique.new('another unique constraint')
-      allow_any_instance_of(ActiveRecord::Relation)
-          .to receive(:update_all).and_raise(database_error)
-      allow(described_class).to receive(:build_persisted_conflicts).and_return([])
-
-      expect { described_class.apply! }.to raise_error(database_error)
-      expect(post.reload.url).to eq('https://example.com/source/1')
-    end
-  end
-
-  def capture_sql
-    statements = []
-    subscriber = lambda do |_name, _start, _finish, _id, payload|
-      binds = payload.fetch(:binds, []).map { _1.value_for_database.to_s }
-      statements << ([payload.fetch(:sql)] + binds).join(' ')
-    end
-    ActiveSupport::Notifications.subscribed(subscriber, 'sql.active_record') { yield }
-    statements
-  end
-
-  def create_source_rule
-    described_class.create!(
-      priority: 10,
-      source_pattern: '\\Ahttps://example\\.com/source/(.+)\\z',
-      replacement: 'https://example.com/canonical/\\1'
-    )
-  end
-
-  def create_initial_rules
-    rules = [
-      ['\\Ahttps?://youtu\\.be/([^/?#]+)(?:[?#].*)?\\z', youtube_url('\\1')],
-      ['\\Ahttps?://(?:www\\.|m\\.)?youtube\\.com/live/([^/?#]+)(?:[?#].*)?\\z',
-       youtube_url('\\1')],
-      ['\\Ahttps?://(?:www\\.|m\\.)?youtube\\.com/shorts/([^/?#]+)(?:[?#].*)?\\z',
-       youtube_url('\\1')],
-      ['\\Ahttps?://(?:www\\.|m\\.)?youtube\\.com/embed/([^/?#]+)(?:[?#].*)?\\z',
-       youtube_url('\\1')],
-      ['\\Ahttps?://(?:www\\.|m\\.)?youtube\\.com/watch\\?(?:[^#&]+&)*' \
-       'v=([^&#]+)(?:[&#].*)?\\z', youtube_url('\\1')],
-      ['\\Ahttps?://nico\\.ms/([^/?#]+)(?:[?#].*)?\\z', nico_url('\\1')],
-      ['\\Ahttps?://(?:www\\.)?nicovideo\\.jp/watch/([^?#/]+)(?:[?#].*)?\\z',
-       nico_url('\\1')]
-    ]
-    rules.each_with_index do |(source_pattern, replacement), index|
-      described_class.create!(
-        priority: (index + 1) * 10,
-        source_pattern:,
-        replacement:
-      )
-    end
-  end
-
-  def youtube_url(video_id) = "https://www.youtube.com/watch?v=#{ video_id }"
-
-  def nico_url(video_id) = "https://www.nicovideo.jp/watch/#{ video_id }"
-end

backend/spec/models/setting_spec.rb

@@ -1,34 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Setting, type: :model do
-  it 'accepts the default typed user settings' do
-    setting = described_class.new({ user: create(:user) }.merge(described_class.defaults))
-
-    expect(setting).to be_valid
-  end
-
-  it 'requires one settings row per user' do
-    user = create(:user)
-    described_class.create!({ user: }.merge(described_class.defaults))
-
-    duplicate = described_class.new({ user: }.merge(described_class.defaults))
-
-    expect(duplicate).not_to be_valid
-    expect(duplicate.errors[:user_id]).to be_present
-  end
-
-  it 'validates enum-like settings columns' do
-    setting = described_class.new(
-        { user: create(:user),
-          theme: 'neon',
-          auto_fetch_title: 'sometimes',
-          auto_fetch_thumbnail: 'sometimes',
-          wiki_editor_mode: 'sideways' })
-
-    expect(setting).not_to be_valid
-    expect(setting.errors[:theme]).to be_present
-    expect(setting.errors[:auto_fetch_title]).to be_present
-    expect(setting.errors[:auto_fetch_thumbnail]).to be_present
-    expect(setting.errors[:wiki_editor_mode]).to be_present
-  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.create!(tag: second, parent_tag: first)
-      TagImplication.insert_all!(
-        [
-          {
-            tag_id: second.id,
-            parent_tag_id: first.id,
-            created_at: now,
-            updated_at: now
-          }
-        ]
-      )
 
       expect(described_class.expand_parent_tags([first])).to contain_exactly(first, second)
     end

backend/spec/models/user_theme_slot_spec.rb

@@ -1,40 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe UserThemeSlot, type: :model do
-  it 'accepts a theme slot for one user, base theme, and slot number' do
-    slot = described_class.new(user: create(:user),
-                               base_theme: 'light',
-                               slot_no: 1,
-                               tokens: { 'background' => '0 0% 100%' })
-
-    expect(slot).to be_valid
-  end
-
-  it 'requires unique slot numbers per user and base theme' do
-    user = create(:user)
-    described_class.create!(user:,
-                            base_theme: 'dark',
-                            slot_no: 2,
-                            tokens: { 'background' => '222.2 84% 4.9%' })
-
-    duplicate = described_class.new(user:,
-                                    base_theme: 'dark',
-                                    slot_no: 2,
-                                    tokens: { 'background' => '0 0% 100%' })
-
-    expect(duplicate).not_to be_valid
-    expect(duplicate.errors[:user_id]).to be_present
-  end
-
-  it 'validates base theme, slot number, and token object shape' do
-    slot = described_class.new(user: create(:user),
-                               base_theme: 'system',
-                               slot_no: 4,
-                               tokens: 'not-object')
-
-    expect(slot).not_to be_valid
-    expect(slot.errors[:base_theme]).to be_present
-    expect(slot.errors[:slot_no]).to be_present
-    expect(slot.errors[:tokens]).to be_present
-  end
-end

backend/spec/requests/materials_spec.rb

@@ -1,10 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe 'Materials API', type: :request do
-  include ActiveJob::TestHelper
-
   let!(:member_user) { create(:user, :member) }
-  let!(:admin_user)  { create(:user, :admin) }
   let!(:guest_user)  { create(:user) }
 
   def dummy_upload(filename: 'dummy.png', type: 'image/png', body: 'dummy')
@@ -16,29 +13,22 @@ RSpec.describe 'Materials API', type: :request do
   end
 
   def build_material(tag:, user:, parent: nil, file: dummy_upload, url: nil)
-    Material.new(tag:, parent:, url:,
+    Material.new(tag:, parent:, url:, created_by_user: user, updated_by_user: user).tap do |material|
-                 created_by_user: user,
-                 updated_by_user: user).tap do |material|
       material.file.attach(file) if file
       material.save!
     end
   end
 
   describe 'GET /materials' do
-    let!(:tag_a) do
+    let!(:tag_a) { Tag.create!(tag_name: TagName.create!(name: 'material_index_a'), category: :material) }
-      Tag.create!(tag_name: TagName.create!(name: 'material_index_a'), category: :material)
+    let!(:tag_b) { Tag.create!(tag_name: TagName.create!(name: 'material_index_b'), category: :material) }
-    end
-    let!(:tag_b) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_index_b'), category: :material)
-    end
 
     let!(:material_a) do
       build_material(tag: tag_a, user: member_user, file: dummy_upload(filename: 'a.png'))
     end
 
     let!(:material_b) do
-      build_material(tag: tag_b, user: member_user, parent: material_a,
+      build_material(tag: tag_b, user: member_user, parent: material_a, file: dummy_upload(filename: 'b.png'))
-                     file: dummy_upload(filename: 'b.png'))
     end
 
     before do
@@ -64,36 +54,27 @@ 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
+    it 'filters materials by tag_id' do
-      get '/materials', params: { q: 'material_index_a' }
+      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
+    it 'filters materials by parent_id' do
-      untagged =
+      get '/materials', params: { parent_id: material_a.id }
-          build_material(tag: nil, user: member_user,
-                         file: dummy_upload(filename: 'untagged.png'))
-
-      get '/materials', params: { tag_state: 'untagged' }
 
       expect(response).to have_http_status(:ok)
       expect(json['count']).to eq(1)
-      expect(response_materials.map { |m| m['id'] }).to eq([untagged.id])
+      expect(response_materials.map { |m| m['id'] }).to eq([material_b.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'))
     end
 
     it 'paginates and keeps total count' do
@@ -113,74 +94,10 @@ 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
-    let!(:tag) do
+    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_show'), category: :material) }
-      Tag.create!(tag_name: TagName.create!(name: 'material_show'), category: :material)
-    end
     let!(:material) do
       build_material(tag:, user: member_user, file: dummy_upload(filename: 'show.png'))
     end
@@ -221,22 +138,9 @@ RSpec.describe 'Materials API', type: :request do
       end
     end
 
-    context 'when logged in but not member' do
+    context 'when logged in' do
       before { sign_in_as(guest_user) }
 
-      it 'returns 403' do
-        post '/materials', params: {
-          tag: 'material_create_guest_forbidden',
-          file: dummy_upload
-        }
-
-        expect(response).to have_http_status(:forbidden)
-      end
-    end
-
-    context 'when member' do
-      before { sign_in_as(member_user) }
-
       it 'returns 422 when tag is blank' do
         post '/materials', params: { tag: '   ', file: dummy_upload }
 
@@ -258,68 +162,24 @@ RSpec.describe 'Materials API', type: :request do
         expect do
           post '/materials', params: {
             tag: 'material_create_new',
-            file: dummy_upload(filename: 'created.png'),
+            file: dummy_upload(filename: 'created.png')
-            export_paths: { legacy_drive: '伊地知ニジカ/created.png' }
           }
         end.to change(Material, :count).by(1)
           .and change(Tag, :count).by(1)
           .and change(TagName, :count).by(1)
-          .and change(MaterialVersion, :count).by(1)
 
         expect(response).to have_http_status(:created)
 
         material = Material.order(:id).last
         expect(material.tag.name).to eq('material_create_new')
         expect(material.tag.category).to eq('material')
-        expect(material.created_by_user).to eq(member_user)
+        expect(material.created_by_user).to eq(guest_user)
-        expect(material.updated_by_user).to eq(member_user)
+        expect(material.updated_by_user).to eq(guest_user)
         expect(material.file.attached?).to be(true)
-        expect(material.version_no).to eq(1)
-        expect(material.material_versions.first.event_type).to eq('create')
-        expect(material.material_export_items.first.export_path).to eq('伊地知ニジカ/created.png')
-        expect(material.material_versions.first.export_paths_json).to eq(
-          'legacy_drive' => '伊地知ニジカ/created.png'
-        )
 
         expect(json['id']).to eq(material.id)
         expect(json.dig('tag', 'name')).to eq('material_create_new')
         expect(json['content_type']).to eq('image/png')
-        expect(json.dig('export_paths', 'legacy_drive')).to eq('伊地知ニジカ/created.png')
-      end
-
-      it 'creates a create tag_version for a newly created material tag' do
-        expect do
-          post '/materials', params: {
-            tag: 'material_create_versioned_tag',
-            file: dummy_upload(filename: 'created.png')
-          }
-        end.to change(TagVersion, :count).by(1)
-
-        expect(response).to have_http_status(:created)
-
-        tag = Tag.joins(:tag_name).find_by!(tag_names: { name: 'material_create_versioned_tag' })
-        version = tag.tag_versions.order(:version_no).last
-
-        expect(version.event_type).to eq('create')
-        expect(version.name).to eq('material_create_versioned_tag')
-        expect(version.category).to eq('material')
-        expect(version.created_by_user).to eq(member_user)
-      end
-
-      it 'snapshots attached file metadata and sha256' do
-        post '/materials', params: {
-          tag: 'material_create_file_version',
-          file: dummy_upload(filename: 'created.png', body: 'sha-body')
-        }
-
-        expect(response).to have_http_status(:created)
-
-        version = Material.order(:id).last.material_versions.first
-        expect(version.file_blob_id).to be_present
-        expect(version.file_filename).to eq('created.png')
-        expect(version.file_content_type).to eq('image/png')
-        expect(version.file_byte_size).to eq('sha-body'.bytesize)
-        expect(version.file_sha256).to eq(Digest::SHA256.hexdigest('sha-body'))
       end
 
       it 'returns 422 when the existing tag is not material/character' do
@@ -359,33 +219,11 @@ RSpec.describe 'Materials API', type: :request do
         expect(response).to have_http_status(:created)
         expect(json['url']).to eq('https://example.com/material-source')
       end
-
-      it 'rejects sha256-blocked file upload' do
-        sha256 = Digest::SHA256.hexdigest('blocked-body')
-        MaterialImportBlock.create!(match_kind: 'sha256',
-                                    sha256:,
-                                    reason: 'copyright_high_risk',
-                                    created_by_user: admin_user)
-
-        expect do
-          post '/materials', params: {
-            tag: 'material_blocked_create',
-            file: dummy_upload(filename: 'blocked.png', body: 'blocked-body')
-          }
-        end.not_to change(Material, :count)
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(json.fetch('errors')).to include(
-          'file' => ['抑止された素材です: copyright_high_risk']
-        )
-      end
     end
   end
 
   describe 'PUT /materials/:id' do
-    let!(:tag) do
+    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_update_old'), category: :material) }
-      Tag.create!(tag_name: TagName.create!(name: 'material_update_old'), category: :material)
-    end
     let!(:material) do
       build_material(tag:, user: member_user, file: dummy_upload(filename: 'old.png'))
     end
@@ -439,26 +277,25 @@ RSpec.describe 'Materials API', type: :request do
             'tag' => ['タグは必須です．'])
       end
 
-      it 'keeps the existing file when file and url are omitted' do
+      it 'returns 422 when both file and url are blank' do
         put "/materials/#{ material.id }", params: {
           tag: 'material_update_no_payload'
         }
 
-        expect(response).to have_http_status(:ok)
+        expect(response).to have_http_status(:unprocessable_entity)
-        expect(material.reload.file.attached?).to be(true)
+        expect(json.fetch('errors')).to include(
+            'file' => ['ファイルまたは URL は必須です．'],
+            'url' => ['ファイルまたは URL は必須です．'])
       end
 
       it 'updates tag, url, file, and updated_by_user' do
         old_blob_id = material.file.blob.id
 
-        expect do
+        put "/materials/#{ material.id }", params: {
-          put "/materials/#{ material.id }", params: {
+          tag: 'material_update_new',
-            tag: 'material_update_new',
+          url: 'https://example.com/updated-source',
-            url: 'https://example.com/updated-source',
+          file: dummy_upload(filename: 'updated.jpg', type: 'image/jpeg')
-            file: dummy_upload(filename: 'updated.jpg', type: 'image/jpeg'),
+        }
-            export_paths: { legacy_drive: '伊地知ニジカ/updated.jpg' }
-          }
-        end.to change(MaterialVersion, :count).by(2)
 
         expect(response).to have_http_status(:ok)
 
@@ -469,15 +306,8 @@ RSpec.describe 'Materials API', type: :request do
         expect(material.updated_by_user).to eq(member_user)
         expect(material.file.attached?).to be(true)
         expect(material.file.blob.id).not_to eq(old_blob_id)
-        expect(ActiveStorage::Blob.where(id: old_blob_id).exists?).to be(true)
         expect(material.file.blob.filename.to_s).to eq('updated.jpg')
         expect(material.file.blob.content_type).to eq('image/jpeg')
-        expect(material.version_no).to eq(2)
-        expect(material.material_versions.order(:version_no).last.event_type).to eq('update')
-        expect(material.material_export_items.first.export_path).to eq('伊地知ニジカ/updated.jpg')
-        expect(material.material_versions.order(:version_no).last.export_paths_json).to eq(
-          'legacy_drive' => '伊地知ニジカ/updated.jpg'
-        )
 
         expect(json['id']).to eq(material.id)
         expect(json['file']).to be_present
@@ -485,74 +315,7 @@ RSpec.describe 'Materials API', type: :request do
         expect(json.dig('tag', 'name')).to eq('material_update_new')
       end
 
-      it 'creates a create tag_version when update creates a new tag' do
+      it 'purges the existing file when file is omitted and url is provided' do
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_versioned_tag',
-            file: dummy_upload(filename: 'updated.png')
-          }
-        end.to change(Tag, :count).by(1)
-          .and change(TagName, :count).by(1)
-          .and change(TagVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        tag = Tag.joins(:tag_name).find_by!(tag_names: { name: 'material_update_versioned_tag' })
-        version = tag.tag_versions.order(:version_no).last
-
-        expect(version.event_type).to eq('create')
-        expect(version.name).to eq('material_update_versioned_tag')
-        expect(version.category).to eq('material')
-        expect(version.created_by_user).to eq(member_user)
-      end
-
-      it 'backfills a create tag_version for an existing material tag without history' do
-        existing_tag =
-            Tag.create!(tag_name: TagName.create!(name: 'material_update_existing_no_history'),
-                        category: :material)
-
-        expect(existing_tag.tag_versions).to be_empty
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_existing_no_history',
-            file: dummy_upload(filename: 'updated.png')
-          }
-        end.to change(TagVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        version = existing_tag.reload.tag_versions.order(:version_no).last
-        expect(version.event_type).to eq('create')
-        expect(version.name).to eq('material_update_existing_no_history')
-        expect(version.category).to eq('material')
-        expect(version.created_by_user).to eq(member_user)
-      end
-
-      it 'backfills a create tag_version for an existing character tag without history' do
-        existing_tag =
-            Tag.create!(tag_name: TagName.create!(name: 'material_update_character_no_history'),
-                        category: :character)
-
-        expect(existing_tag.tag_versions).to be_empty
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_character_no_history',
-            file: dummy_upload(filename: 'updated.png')
-          }
-        end.to change(TagVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-
-        version = existing_tag.reload.tag_versions.order(:version_no).last
-        expect(version.event_type).to eq('create')
-        expect(version.name).to eq('material_update_character_no_history')
-        expect(version.category).to eq('character')
-        expect(version.created_by_user).to eq(member_user)
-      end
-
-      it 'detaches the existing file without purging blob when url replaces file' do
         old_blob_id = material.file.blob.id
 
         put "/materials/#{ material.id }", params: {
@@ -568,7 +331,9 @@ RSpec.describe 'Materials API', type: :request do
         expect(material.updated_by_user).to eq(member_user)
         expect(material.file.attached?).to be(false)
 
-        expect(ActiveStorage::Blob.where(id: old_blob_id).exists?).to be(true)
+        expect(
+          ActiveStorage::Blob.where(id: old_blob_id).exists?
+        ).to be(false)
 
         expect(json['id']).to eq(material.id)
         expect(json['file']).to be_nil
@@ -576,208 +341,11 @@ RSpec.describe 'Materials API', type: :request do
         expect(json.dig('tag', 'name')).to eq('material_update_remove_file')
         expect(json['url']).to eq('https://example.com/updated-source')
       end
-
-      it 'does not increase version for the same snapshot update' do
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: member_user)
-        TagVersioning.ensure_snapshot!(tag, created_by_user: member_user)
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_old'
-          }
-        end.not_to change(MaterialVersion, :count)
-
-        expect(tag.reload.tag_versions.count).to eq(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.version_no).to eq(1)
-      end
-
-      it 'records update version when only export_path changes' do
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: member_user)
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_old',
-            export_paths: { legacy_drive: '素材/only-path.png' }
-          }
-        end.to change(MaterialVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.material_export_items.first.export_path).to eq('素材/only-path.png')
-        expect(material.material_versions.order(:version_no).last.export_paths_json).to eq(
-          'legacy_drive' => '素材/only-path.png'
-        )
-      end
-
-      it 'removes export_path item when blank is submitted' do
-        MaterialExportItem.create!(material:, profile: 'legacy_drive',
-                                   export_path: '素材/remove.png',
-                                   created_by_user: member_user)
-        MaterialVersionRecorder.record!(material:, event_type: :create,
-                                        created_by_user: member_user)
-
-        expect do
-          put "/materials/#{ material.id }", params: {
-            tag: 'material_update_old',
-            export_paths: { legacy_drive: '' }
-          }
-        end.to change(MaterialExportItem, :count).by(-1)
-          .and change(MaterialVersion, :count).by(1)
-
-        expect(response).to have_http_status(:ok)
-        expect(material.reload.material_export_items).to be_empty
-        expect(material.material_versions.order(:version_no).last.export_paths_json).to eq({})
-      end
-
-      it 'rejects sha256-blocked replacement file' do
-        sha256 = Digest::SHA256.hexdigest('blocked-update')
-        MaterialImportBlock.create!(match_kind: 'sha256',
-                                    sha256:,
-                                    reason: 'source_owner_request',
-                                    created_by_user: admin_user)
-
-        put "/materials/#{ material.id }", params: {
-          tag: 'material_update_old',
-          file: dummy_upload(filename: 'blocked.png', body: 'blocked-update')
-        }
-
-        expect(response).to have_http_status(:unprocessable_entity)
-        expect(material.reload.file.blob.filename.to_s).to eq('old.png')
-      end
-    end
-  end
-
-  describe 'GET /materials/download.zip' do
-    let!(:tag_a) { Tag.create!(tag_name: TagName.create!(name: 'zip_a'), category: :material) }
-    let!(:tag_b) { Tag.create!(tag_name: TagName.create!(name: 'zip_b'), category: :material) }
-    let!(:material_a) do
-      build_material(tag: tag_a, user: member_user,
-                     file: dummy_upload(filename: 'a.png', body: 'zip-a'))
-    end
-    let!(:material_b) do
-      build_material(tag: tag_b, user: member_user,
-                     file: dummy_upload(filename: 'b.png', body: 'zip-b'))
-    end
-
-    before do
-      MaterialExportItem.create!(material: material_a, profile: 'legacy_drive',
-                                 export_path: '素材/a.png',
-                                 created_by_user: member_user)
-      MaterialExportItem.create!(material: material_b, profile: 'legacy_drive',
-                                 export_path: '素材/b.png',
-                                 created_by_user: member_user)
-    end
-
-    it 'uses material_export_items.export_path as ZIP entry paths' do
-      get '/materials/download.zip', params: { profile: 'legacy_drive' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.media_type).to eq('application/zip')
-      expect(response.body.b).to include('素材/a.png'.b)
-      expect(response.body.b).to include('素材/b.png'.b)
-    end
-
-    it 'filters by tag_id' do
-      get '/materials/download.zip', params: { profile: 'legacy_drive', tag_id: tag_a.id }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.body.b).to include('素材/a.png'.b)
-      expect(response.body.b).not_to include('素材/b.png'.b)
-    end
-
-    it 'does not include disabled export items' do
-      material_b.material_export_items.first.update!(enabled: false)
-
-      get '/materials/download.zip', params: { profile: 'legacy_drive' }
-
-      expect(response).to have_http_status(:ok)
-      expect(response.body.b).to include('素材/a.png'.b)
-      expect(response.body.b).not_to include('素材/b.png'.b)
-    end
-  end
-
-  describe 'GET /materials/versions' do
-    let!(:tag) do
-      Tag.create!(tag_name: TagName.create!(name: 'material_history'), category: :material)
-    end
-    let!(:material) do
-      build_material(tag:, user: member_user, file: dummy_upload(filename: 'history.png'))
-    end
-
-    it 'returns material versions in reverse chronological order' do
-      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)
-
-      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'
-      )
     end
   end
 
   describe 'DELETE /materials/:id' do
-    let!(:tag) do
+    let!(:tag) { Tag.create!(tag_name: TagName.create!(name: 'material_destroy'), category: :material) }
-      Tag.create!(tag_name: TagName.create!(name: 'material_destroy'), category: :material)
-    end
     let!(:material) do
       build_material(tag:, user: member_user, file: dummy_upload(filename: 'destroy.png'))
     end

backend/spec/requests/post_imports_spec.rb

@@ -1,112 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'Post imports API', type: :request do
-  let(:member) { create(:user, :member) }
-
-  before do
-    allow(Preview::UrlSafety).to receive(:validate) do |url|
-      [URI.parse(url), ['8.8.8.8']]
-    end
-    allow(PostMetadataFetcher).to receive(:fetch).and_return(
-      title: 'fetched title',
-      thumbnail_base: nil,
-      tags: ''
-    )
-  end
-
-  describe 'POST /posts/import/preview' do
-    it 'requires a member' do
-      sign_out
-      post '/posts/import/preview', params: { source: 'https://example.com/post' }
-      expect(response).to have_http_status(:unauthorized)
-
-      sign_in_as(create(:user, :guest))
-      post '/posts/import/preview', params: { source: 'https://example.com/post' }
-      expect(response).to have_http_status(:forbidden)
-    end
-
-    it 'parses a URL list and returns preview rows' do
-      sign_in_as(member)
-
-      post '/posts/import/preview', params: {
-        source: " https://example.com/one \r\n\r\nhttps://example.com/two"
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(json.fetch('rows').map { _1.fetch('source_row') }).to eq([1, 3])
-      expect(json.fetch('rows').map { _1.fetch('url') }).to eq([
-        'https://example.com/one',
-        'https://example.com/two'
-      ])
-    end
-
-    it 'returns a safe 400 response for an invalid source' do
-      sign_in_as(member)
-
-      post '/posts/import/preview', params: { source: '' }
-
-      expect(response).to have_http_status(:bad_request)
-      expect(json.fetch('message')).to eq('URL を入力してください．')
-    end
-  end
-
-  describe 'POST /posts/import/validate' do
-    it 'accepts camel-case row properties and returns their warnings' do
-      sign_in_as(member)
-
-      post '/posts/import/validate', params: {
-        rows: [{
-          sourceRow: '1',
-          url: 'https://example.com/post',
-          metadataUrl: 'https://example.com/post',
-          attributes: { title: 'manual title' },
-          provenance: { url: 'manual', title: 'manual' },
-          tagSources: { automatic: '', manual: '' },
-          fieldWarnings: { title: ['old warning'] },
-          baseWarnings: ['base warning']
-        }],
-        changed_row: -1
-      }
-
-      expect(response).to have_http_status(:ok)
-      result = json.fetch('rows').first
-      expect(result.fetch('source_row')).to eq(1)
-      expect(result.fetch('tag_sources')).to eq('automatic' => '', 'manual' => '')
-      expect(result.fetch('field_warnings')).to eq('title' => ['old warning'])
-      expect(result.fetch('base_warnings')).to eq(['base warning'])
-    end
-
-    it 'rejects a non-array rows value with 400' do
-      sign_in_as(member)
-
-      post '/posts/import/validate', params: { rows: { sourceRow: 1 }, changed_row: -1 }
-
-      expect(response).to have_http_status(:bad_request)
-      expect(json.fetch('message')).to eq('取込行の形式が不正です．')
-    end
-  end
-
-  describe 'POST /posts/import' do
-    it 'returns a formal skipped result for an existing post' do
-      existing = create(:post, url: 'https://example.com/existing')
-      sign_in_as(member)
-
-      post '/posts/import', params: {
-        rows: [{
-          sourceRow: 1,
-          url: existing.url,
-          attributes: { title: 'ignored' },
-          provenance: { url: 'manual', title: 'manual' },
-          tagSources: { automatic: '', manual: '' }
-        }]
-      }
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('created' => 0, 'skipped' => 1, 'failed' => 0)
-      expect(json.fetch('rows').first).to include(
-        'status' => 'skipped',
-        'existing_post_id' => existing.id
-      )
-    end
-  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/preview_spec.rb

@@ -1,46 +1,28 @@
-require 'rails_helper'
+require "rails_helper"
 
 
-RSpec.describe 'Preview', type: :request do
+RSpec.describe "Preview", type: :request do
-  describe 'GET /preview/title' do
+  describe "GET /preview/title" do
-    it '401 unless logged in' do
+    it "401 unless logged in" do
       sign_out
-      get '/preview/title', params: { url: 'example.com' }
+      get "/preview/title", params: { url: "example.com" }
       expect(response).to have_http_status(:unauthorized)
     end
 
-    it '403 when logged in as guest' do
+    it "400 when url blank" do
-      sign_in_as(create(:user, :guest))
+      sign_in_as(create(:user))
-      get '/preview/title', params: { url: 'example.com' }
+      get "/preview/title", params: { url: "" }
-      expect(response).to have_http_status(:forbidden)
-    end
-
-    it '400 when url blank' do
-      sign_in_as(create(:user, :member))
-      get '/preview/title', params: { url: '' }
       expect(response).to have_http_status(:bad_request)
     end
 
-    it 'returns parsed title' do
+    it "returns parsed title (stubbing URI.open)" do
-      sign_in_as(create(:user, :member))
+      sign_in_as(create(:user))
-      allow(Preview::ThumbnailFetcher)
+      fake_html = "<html><head><title>  Hello  </title></head></html>"
-          .to receive(:title)
+      allow(URI).to receive(:open).and_return(StringIO.new(fake_html))
-          .with('example.com')
-          .and_return('Hello')
 
-      get '/preview/title', params: { url: 'example.com' }
+      get "/preview/title", params: { url: "example.com" }
       expect(response).to have_http_status(:ok)
-      expect(json['title']).to eq('Hello')
+      expect(json["title"]).to eq("Hello")
-    end
-
-    it '413 when fetched response is too large' do
-      sign_in_as(create(:user, :member))
-      allow(Preview::ThumbnailFetcher)
-          .to receive(:title)
-          .and_raise(Preview::HttpFetcher::ResponseTooLarge, '外部データが大きすぎます．')
-
-      get '/preview/title', params: { url: 'example.com' }
-      expect(response).to have_http_status(:payload_too_large)
     end
   end
 end

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.create!(tag: first, parent_tag: second)
-      TagImplication.insert_all!(
-        [
-          {
-            tag_id: first.id,
-            parent_tag_id: second.id,
-            created_at: now,
-            updated_at: now
-          }
-        ]
-      )
 
       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/requests/user_settings_spec.rb

@@ -1,98 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'user settings', type: :request do
-  describe 'GET /users/settings' do
-    it 'requires a current user' do
-      sign_out
-
-      get '/users/settings'
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'returns defaults and creates a missing settings row' do
-      user = create(:user)
-      sign_in_as(user)
-
-      expect {
-        get '/users/settings'
-      }.to change(Setting, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to eq(
-          'theme' => 'system',
-          'auto_fetch_title' => 'manual',
-          'auto_fetch_thumbnail' => 'manual',
-          'wiki_editor_mode' => 'split')
-      expect(user.reload.setting).to be_present
-    end
-  end
-
-  describe 'PATCH /users/settings' do
-    it 'requires a current user' do
-      sign_out
-
-      patch '/users/settings', params: { theme: 'dark' }, as: :json
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'updates multiple typed settings at once' do
-      user = create(:user)
-      sign_in_as(user)
-
-      patch '/users/settings',
-            params: {
-              theme: 'dark',
-              auto_fetch_title: 'auto',
-              auto_fetch_thumbnail: 'off',
-              wiki_editor_mode: 'preview' },
-            as: :json
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include(
-          'theme' => 'dark',
-          'auto_fetch_title' => 'auto',
-          'auto_fetch_thumbnail' => 'off',
-          'wiki_editor_mode' => 'preview')
-      expect(user.reload.setting).to have_attributes(
-          theme: 'dark',
-          auto_fetch_title: 'auto',
-          auto_fetch_thumbnail: 'off',
-          wiki_editor_mode: 'preview')
-    end
-
-    it 'does not treat Rails parameter wrapping as an editable setting' do
-      user = create(:user)
-      sign_in_as(user)
-
-      patch '/users/settings',
-            params: { theme: 'light', user_setting: { theme: 'dark' } },
-            as: :json
-
-      expect(response).to have_http_status(:ok)
-      expect(user.reload.setting.theme).to eq('light')
-    end
-
-    it 'returns validation_error for type mismatches' do
-      sign_in_as(create(:user))
-
-      patch '/users/settings', params: { theme: 1 }, as: :json
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json).to include('type' => 'validation_error')
-      expect(json.fetch('errors')).to include(
-          'theme' => ['値の型が不正です．'])
-    end
-
-    it 'returns validation_error for invalid enum values' do
-      sign_in_as(create(:user))
-
-      patch '/users/settings', params: { theme: 'neon' }, as: :json
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json).to include('type' => 'validation_error')
-      expect(json.fetch('errors').fetch('theme')).to be_present
-    end
-  end
-end

backend/spec/requests/user_theme_slots_spec.rb

@@ -1,104 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'user theme slots', type: :request do
-  describe 'GET /users/theme_slots' do
-    it 'requires a current user' do
-      sign_out
-
-      get '/users/theme_slots'
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'returns only the current user slots in stable order' do
-      user = create(:user)
-      other_user = create(:user)
-      sign_in_as(user)
-      UserThemeSlot.create!(user:, base_theme: 'light', slot_no: 2, tokens: { 'a' => 1 })
-      UserThemeSlot.create!(user:, base_theme: 'dark', slot_no: 1, tokens: { 'b' => 2 })
-      UserThemeSlot.create!(user: other_user,
-                            base_theme: 'dark',
-                            slot_no: 3,
-                            tokens: { 'c' => 3 })
-
-      get '/users/theme_slots'
-
-      expect(response).to have_http_status(:ok)
-      expect(json.map { |slot| [slot.fetch('base_theme'), slot.fetch('slot_no')] }).to eq(
-          [['dark', 1], ['light', 2]])
-      expect(json.map { |slot| slot.fetch('tokens') }).to eq(
-          [{ 'b' => 2 }, { 'a' => 1 }])
-    end
-  end
-
-  describe 'PUT /users/theme_slots/:base_theme/:slot_no' do
-    it 'requires a current user' do
-      sign_out
-
-      put '/users/theme_slots/light/1',
-          params: { tokens: { background: '0 0% 100%' } },
-          as: :json
-
-      expect(response).to have_http_status(:unauthorized)
-    end
-
-    it 'creates a theme slot' do
-      user = create(:user)
-      sign_in_as(user)
-
-      expect {
-        put '/users/theme_slots/light/1',
-            params: { tokens: { background: '0 0% 100%', tagColours: { nico: '#ffffff' } } },
-            as: :json
-      }.to change(UserThemeSlot, :count).by(1)
-
-      expect(response).to have_http_status(:ok)
-      expect(json).to include('base_theme' => 'light', 'slot_no' => 1)
-      expect(json.fetch('tokens')).to include(
-          'background' => '0 0% 100%',
-          'tagColours' => { 'nico' => '#ffffff' })
-      expect(user.theme_slots.find_by!(base_theme: 'light', slot_no: 1).tokens).to include(
-          'background' => '0 0% 100%')
-    end
-
-    it 'updates an existing theme slot instead of creating a duplicate' do
-      user = create(:user)
-      sign_in_as(user)
-      UserThemeSlot.create!(user:, base_theme: 'dark', slot_no: 2, tokens: { 'old' => true })
-
-      expect {
-        put '/users/theme_slots/dark/2',
-            params: { tokens: { background: '222.2 84% 4.9%' } },
-            as: :json
-      }.not_to change(UserThemeSlot, :count)
-
-      expect(response).to have_http_status(:ok)
-      expect(user.theme_slots.find_by!(base_theme: 'dark', slot_no: 2).tokens).to eq(
-          'background' => '222.2 84% 4.9%')
-    end
-
-    it 'rejects invalid path parameters and token shapes' do
-      sign_in_as(create(:user))
-
-      put '/users/theme_slots/system/4',
-          params: { tokens: 'not-object' },
-          as: :json
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          'base_theme' => ['値が不正です．'])
-    end
-
-    it 'rejects non-object tokens for valid slots' do
-      sign_in_as(create(:user))
-
-      put '/users/theme_slots/light/1',
-          params: { tokens: 'not-object' },
-          as: :json
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          'tokens' => ['JSON object で指定してください．'])
-    end
-  end
-end

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

backend/spec/services/post_import_previewer_spec.rb

@@ -1,187 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe PostImportPreviewer do
-  before do
-    allow(Preview::UrlSafety).to receive(:validate) do |url|
-      [URI.parse(url), ['8.8.8.8']]
-    end
-  end
-
-  def row(source_row:, url:, attributes: { }, provenance: { }, **values)
-    {
-      source_row:,
-      url:,
-      attributes:,
-      provenance:
-    }.merge(values)
-  end
-
-  describe '#preview_rows' do
-    it 'marks an existing post for skipping without fetching metadata' do
-      existing = create(:post, url: 'https://example.com/existing')
-      expect(PostMetadataFetcher).not_to receive(:fetch)
-
-      result = described_class.new.preview_rows(rows: [
-        row(source_row: 1, url: 'https://EXAMPLE.com/existing/')
-      ]).first
-
-      expect(result).to include(
-        url: 'https://example.com/existing',
-        skip_reason: 'existing',
-        existing_post_id: existing.id,
-        validation_errors: {}
-      )
-      expect(result.fetch(:field_warnings)).to eq({})
-    end
-
-    it 'reports list duplicates as URL errors instead of existing skips' do
-      create(:post, url: 'https://example.com/duplicate')
-      expect(PostMetadataFetcher).not_to receive(:fetch)
-
-      results = described_class.new.preview_rows(rows: [
-        row(source_row: 1, url: 'https://example.com/duplicate'),
-        row(source_row: 2, url: 'https://EXAMPLE.com/duplicate/')
-      ])
-
-      expect(results.map { _1[:validation_errors] }).to all(
-        include(url: ['URL が重複しています．'])
-      )
-      expect(results).to all(include(skip_reason: nil, existing_post_id: nil))
-    end
-
-    it 'does not fetch metadata for an unsafe URL' do
-      allow(Preview::UrlSafety).to receive(:validate)
-          .and_raise(Preview::UrlSafety::UnsafeUrl, '安全でない接続先は使用できません．')
-      expect(PostMetadataFetcher).not_to receive(:fetch)
-
-      result = described_class.new.preview_rows(rows: [
-        row(source_row: 1, url: 'https://unsafe.example/post')
-      ]).first
-
-      expect(result.fetch(:validation_errors)).to include(
-        url: ['安全でない接続先は使用できません．']
-      )
-    end
-
-    it 'applies metadata to automatic fields and recognises metadata tags' do
-      Tag.create!(name: 'known-tag', category: :general)
-      allow(PostMetadataFetcher).to receive(:fetch).and_return(
-        title: 'metadata title',
-        thumbnail_base: 'https://example.com/thumb.jpg',
-        duration: 2_000,
-        tags: 'known-tag'
-      )
-
-      result = described_class.new.preview_rows(rows: [
-        row(source_row: 1, url: 'https://example.com/new')
-      ]).first
-
-      expect(result.fetch(:attributes)).to include(
-        'title' => 'metadata title',
-        'thumbnail_base' => 'https://example.com/thumb.jpg',
-        'duration' => 2_000,
-        'tags' => 'known-tag'
-      )
-      expect(result.fetch(:field_warnings)).not_to have_key('tags')
-      expect(PostMetadataFetcher).to have_received(:fetch).once
-    end
-
-    it 'preserves manual empty values when metadata is available' do
-      allow(PostMetadataFetcher).to receive(:fetch).and_return(
-        title: 'metadata title',
-        tags: 'metadata-tag'
-      )
-
-      result = described_class.new.preview_rows(rows: [
-        row(
-          source_row: 1,
-          url: 'https://example.com/manual',
-          attributes: { title: '', tags: '' },
-          provenance: { title: 'manual', tags: 'manual' },
-          tag_sources: { automatic: 'old-tag', manual: '' }
-        )
-      ]).first
-
-      expect(result.fetch(:attributes)).to include('title' => '', 'tags' => '')
-      expect(result.fetch(:tag_sources)).to include('manual' => '')
-    end
-
-    it 'clears warnings derived from an old metadata URL' do
-      allow(PostMetadataFetcher).to receive(:fetch).and_return(
-        title: 'new title',
-        thumbnail_base: 'https://example.com/new-thumb.jpg',
-        tags: ''
-      )
-
-      result = described_class.new.preview_rows(rows: [
-        row(
-          source_row: 1,
-          url: 'https://example.com/new-url',
-          attributes: { title: 'old title', tags: 'old-tag' },
-          provenance: { title: 'automatic', tags: 'automatic' },
-          tag_sources: { automatic: 'old-tag', manual: '' },
-          metadata_url: 'https://example.com/old-url',
-          field_warnings: { tags: ['old tag warning'], url: ['old fetch warning'] },
-          base_warnings: ['old base warning']
-        )
-      ]).first
-
-      expect(result.fetch(:attributes)).to include('title' => 'new title', 'tags' => '')
-      expect(result.fetch(:base_warnings)).to eq([])
-      expect(result.fetch(:field_warnings).values.flatten)
-          .not_to include('old tag warning', 'old fetch warning')
-    end
-
-    it 'isolates an unexpected metadata failure to the affected URL' do
-      allow(PostMetadataFetcher).to receive(:fetch) do |url|
-        raise 'fetch failure' if url.include?('failure')
-
-        { title: 'successful title', tags: '' }
-      end
-      allow(Rails.logger).to receive(:error)
-
-      results = described_class.new.preview_rows(rows: [
-        row(source_row: 1, url: 'https://example.com/failure'),
-        row(source_row: 2, url: 'https://example.com/success')
-      ])
-
-      expect(results[0].fetch(:field_warnings)).to include(
-        'url' => [described_class::METADATA_FETCH_WARNING]
-      )
-      expect(results[1].fetch(:attributes)).to include('title' => 'successful title')
-    end
-
-    it 'turns an unsafe URL detected during metadata fetching into a URL error' do
-      allow(PostMetadataFetcher).to receive(:fetch)
-          .and_raise(Preview::UrlSafety::UnsafeUrl, '安全でない接続先です．')
-      allow(Rails.logger).to receive(:info)
-
-      result = described_class.new.preview_rows(rows: [
-        row(source_row: 1, url: 'https://example.com/redirects-to-private')
-      ]).first
-
-      expect(result.fetch(:validation_errors)).to include(
-        url: ['安全でない接続先です．']
-      )
-    end
-
-    it 'validates parent IDs from the preloaded set' do
-      parent = create(:post)
-
-      results = described_class.new.preview_rows(
-        rows: [
-          row(source_row: 1, url: 'https://example.com/valid-parent',
-              attributes: { parent_post_ids: parent.id.to_s }),
-          row(source_row: 2, url: 'https://example.com/missing-parent',
-              attributes: { parent_post_ids: '999999' })
-        ],
-        fetch_metadata: false
-      )
-
-      expect(results[0].fetch(:validation_errors)).not_to have_key(:parent_post_ids)
-      expect(results[1].fetch(:validation_errors)).to include(
-        parent_post_ids: ['存在しない親投稿 Id. があります．']
-      )
-    end
-  end
-end

backend/spec/services/post_import_row_normaliser_spec.rb

@@ -1,77 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe PostImportRowNormaliser do
-  def valid_row(overrides = { })
-    {
-      sourceRow: '1',
-      url: 'https://example.com/post',
-      metadataUrl: 'https://example.com/post',
-      attributes: { title: 'title', duration: 1_000 },
-      provenance: { url: 'manual', title: 'automatic' },
-      tagSources: { automatic: 'tag', manual: '' }
-    }.deep_merge(overrides)
-  end
-
-  describe '.normalise!' do
-    it 'normalises aliases and source rows into a permitted plain hash' do
-      row = ActionController::Parameters.new(valid_row)
-
-      expect(described_class.normalise!([row])).to eq([
-        {
-          'source_row' => 1,
-          'url' => 'https://example.com/post',
-          'metadata_url' => 'https://example.com/post',
-          'attributes' => { 'title' => 'title', 'duration' => 1_000 },
-          'provenance' => { 'url' => 'manual', 'title' => 'automatic' },
-          'tag_sources' => { 'automatic' => 'tag', 'manual' => '' }
-        }
-      ])
-    end
-
-    it 'normalises source rows before checking duplicates' do
-      rows = [valid_row, valid_row(sourceRow: 1, url: 'https://example.com/other')]
-
-      expect { described_class.normalise!(rows) }
-          .to raise_error(ArgumentError, '元行番号が重複しています．')
-    end
-
-    it 'rejects non-array batches and non-hash rows' do
-      expect { described_class.normalise!({}) }
-          .to raise_error(ArgumentError, '取込行の形式が不正です．')
-      expect { described_class.normalise!(['row']) }
-          .to raise_error(ArgumentError, '取込行の形式が不正です．')
-    end
-
-    it 'rejects unknown attributes and invalid field types' do
-      expect { described_class.normalise!([valid_row(attributes: { unknown: 'x' })]) }
-          .to raise_error(ArgumentError, '取込項目が不正です．')
-      expect { described_class.normalise!([valid_row(attributes: { title: [] })]) }
-          .to raise_error(ArgumentError, '取込項目の型が不正です．')
-      expect { described_class.normalise!([valid_row(attributes: { duration: false })]) }
-          .to raise_error(ArgumentError, '取込項目の型が不正です．')
-    end
-
-    it 'rejects unknown provenance and tag-source values' do
-      expect { described_class.normalise!([valid_row(provenance: { title: 'mapped' })]) }
-          .to raise_error(ArgumentError, '値の由来が不正です．')
-      expect { described_class.normalise!([valid_row(tagSources: { mapped: 'tag' })]) }
-          .to raise_error(ArgumentError, 'タグ由来の形式が不正です．')
-    end
-
-    it 'accepts warning fields only at the validation boundary' do
-      row = valid_row.merge(
-        fieldWarnings: { title: ['取得できませんでした．'] },
-        baseWarnings: ['確認してください．']
-      )
-
-      without_warnings = described_class.normalise!([row]).first
-      with_warnings = described_class.normalise!([row], allow_warning_fields: true).first
-
-      expect(without_warnings).not_to include('field_warnings', 'base_warnings')
-      expect(with_warnings).to include(
-        'field_warnings' => { 'title' => ['取得できませんでした．'] },
-        'base_warnings' => ['確認してください．']
-      )
-    end
-  end
-end