#434

backend/spec/models/history_access_spec.rb

@@ -0,0 +1,67 @@
+require 'rails_helper'
+
+RSpec.describe HistoryAccess do
+  include_context 'Ainu locale'
+
+  let!(:tag) { create(:tag) }
+
+  it 'uses the complete tag-description identity and version order at equal timestamps' do
+    locale
+    rows = ['ja', 'ain'].flat_map do |language|
+      ['create', 'discard', 'restore'].each_with_index.map do |event, index|
+        TagDescriptionVersion.create!(tag_id: tag.id, language_code: language,
+            version_no: index + 1, event_type: language == 'ain' ? 'update' : event,
+            body: "#{ language } #{ index }", created_at: Time.utc(2024))
+      end
+    end
+    described_class.set(user: nil) do
+      expect(described_class.visible(TagDescriptionVersion.where(id: rows.map(&:id))).pluck(:id))
+          .to match_array([rows[2], *rows.last(3)].map(&:id))
+      expect { described_class.require!(rows.first) }.to raise_error(HistoryAccess::Forbidden)
+    end
+    described_class.set(user: create(:user, :admin)) do
+      expect(described_class.visible(TagDescriptionVersion.where(id: rows.map(&:id))).count).to eq(6)
+    end
+  end
+
+  it 'invalidates public artifacts after a new discard and binds admin artifacts to their actor' do
+    public_metadata = described_class.set(user: nil) { described_class.authority }
+    admin = create(:user, :admin)
+    admin_metadata = described_class.set(user: admin) { described_class.authority }
+    TagVersion.create!(tag:, version_no: 1, event_type: 'discard', name: 'private',
+        category: 'general', names: { ja: { name: 'private' } },
+        aliases: '', parent_tag_ids: '', created_at: Time.utc(2024))
+    described_class.set(user: nil) do
+      expect(described_class.authorised_artifact?(public_metadata)).to be(false)
+      expect(described_class.authorised_artifact?(admin_metadata)).to be(false)
+    end
+    described_class.set(user: create(:user, :admin)) do
+      expect(described_class.authorised_artifact?(admin_metadata)).to be(false)
+    end
+    described_class.set(user: admin) do
+      expect(described_class.authorised_artifact?(admin_metadata)).to be(true)
+      admin.update!(role: :guest)
+      expect(described_class.authorised_artifact?(admin_metadata)).to be(false)
+    end
+  end
+
+  it 'denies a blob attached to a discarded post including its derived attachment' do
+    post = create(:post)
+    blob = ActiveStorage::Blob.create_before_direct_upload!(filename: 'private.png',
+        byte_size: 1, checksum: Base64.strict_encode64('checksum'), content_type: 'image/png')
+    ActiveStorage::Attachment.create!(name: 'thumbnail', record: post, blob:)
+    PostVersion.create!(post:, version_no: 1, event_type: 'discard', url: post.url,
+        title: 'private', tags: '', tags_json: [], parent_post_ids: '', created_at: Time.utc(2024))
+    variant = ActiveStorage::VariantRecord.create!(blob:, variation_digest: 'spec-variation')
+    derived = ActiveStorage::Blob.create_before_direct_upload!(filename: 'derived.png',
+        byte_size: 1, checksum: Base64.strict_encode64('checksum'), content_type: 'image/png')
+    ActiveStorage::Attachment.create!(name: 'image', record: variant, blob: derived)
+    described_class.set(user: nil) do
+      expect(described_class.blob_visible?(blob)).to be(false)
+      expect(described_class.blob_visible?(derived)).to be(false)
+    end
+    described_class.set(user: create(:user, :admin)) do
+      expect(described_class.blob_visible?(derived)).to be(true)
+    end
+  end
+end

backend/spec/requests/counts_history_boundaries_spec.rb

@@ -0,0 +1,40 @@
+require 'rails_helper'
+
+RSpec.describe 'History boundaries shared with Counts', type: :request do
+  let!(:tag) { create(:tag, primary_name: 'description tag') }
+  let!(:description) do
+    TagDescription.create!(tag:, language_code: 'ja', version_no: 2, body: 'private body')
+  end
+
+  before do
+    ['create', 'discard'].each_with_index do |event, index|
+      TagDescriptionVersion.create!(tag_id: tag.id, language_code: 'ja',
+          version_no: index + 1, event_type: event, body: 'private body',
+          created_at: Time.utc(2024))
+    end
+  end
+
+  it 'denies the same discarded description through Counts, the facade and the ordinary API' do
+    get '/counts/query', params: { resource: 'tag_descriptions', definition: 'history',
+        mode: 'details', locale: 'ja', execution_at: '2025-01-01T00:00:00Z' }
+    expect(response).to have_http_status(:ok)
+    expect(response.parsed_body).to include('count' => 0, 'output_count' => 2,
+        'excluded_count' => 2, 'versions' => [])
+    ["/wiki/#{ description.id }", "/tags/#{ tag.id }/description"].each do |path|
+      get path, params: { locale: 'ja' }
+      expect(response).to have_http_status(:not_found)
+      expect(response.body).not_to include('private body')
+    end
+    get '/sitemap_entries/descriptions', params: { locale: 'ja' }
+    expect(response).to have_http_status(:ok)
+    expect(response.parsed_body['ids']).not_to include(description.id)
+  end
+
+  it 'permits the server-authenticated administrator to read the discarded description' do
+    sign_in_as(create(:user, :admin))
+    get "/tags/#{ tag.id }/description", params: { locale: 'ja' }
+    expect(response).to have_http_status(:ok)
+    expect(response.parsed_body['body']).to eq('private body')
+    expect(response.headers['Cache-Control']).to include('no-store')
+  end
+end

backend/spec/requests/counts_spec.rb

@@ -1,6 +1,6 @@
 require 'rails_helper'
 
-RSpec.describe 'Counts API', type: :request do
+RSpec.describe 'Legacy Counts API', type: :request do
   let!(:actor) { create(:user, :member) }
   let!(:post) { create(:post) }
   let!(:tag) { create(:tag, primary_name: 'counts tag', category: :general) }
@@ -28,16 +28,16 @@ RSpec.describe 'Counts API', type: :request do
     context resource do
       let(:path) { "/counts/#{ resource }" }
       let(:id) { resource == 'posts' ? post.id : tag.id }
-      let(:filters) { { resource_id: id, user_id: actor.id,
+      let(:filters) { { resource_id: id, user_id: actor.id, latest: '0',
                        from: '2024-01-01T00:00Z', before: '2024-02-01T00:00Z' } }
 
       it 'uses the same AND filters for SQL totals, groups and details' do
-        get path, params: filters.merge(axis: 'event_type')
+        get path, params: filters.merge(axis: 'month')
         expect(response).to have_http_status(:ok)
         summary = response.parsed_body
         expect(summary['count']).to eq(2)
         expect(summary['groups'].sum { _1['count'] }).to eq(2)
-        expect(summary['groups'].map { _1['key'] }).to eq(['create', 'update'])
+        expect(summary['groups'].map { _1['key'] }).to eq(['2024-01'])
 
         get path, params: filters.merge(mode: 'details')
         expect(response.parsed_body['count']).to eq(2)
@@ -45,16 +45,16 @@ RSpec.describe 'Counts API', type: :request do
       end
 
       it 'paginates details and groups independently from totals' do
-        get path, params: { resource_id: id, mode: 'details', limit: 1, page: 2 }
+        get path, params: { resource_id: id, latest: '0', mode: 'details', limit: 1, page: 2 }
         expect(response.parsed_body['count']).to eq(3)
         expect(response.parsed_body['versions'].sole['version_no']).to eq(2)
-        get path, params: { resource_id: id, axis: 'month', limit: 1, page: 2 }
+        get path, params: { resource_id: id, latest: '0', axis: 'month', limit: 1, page: 2 }
         expect(response.parsed_body['group_count']).to eq(2)
         expect(response.parsed_body['groups'].sole).to include('key' => '2024-02', 'count' => 1)
       end
 
       it 'groups null actors and supports their drill-down filter' do
-        get path, params: { resource_id: id, axis: 'user' }
+        get path, params: { resource_id: id, latest: '0', axis: 'user' }
         expect(response.parsed_body['groups']).to include(
             { 'key' => nil, 'name' => nil, 'count' => 1 })
         get path, params: { resource_id: id, mode: 'details', user_id: 'none' }
@@ -62,7 +62,7 @@ RSpec.describe 'Counts API', type: :request do
       end
 
       it 'uses an inclusive start and exclusive end' do
-        get path, params: { resource_id: id,
+        get path, params: { resource_id: id, latest: '0',
                             from: '2024-01-01T00:00Z', before: '2024-01-02T00:00Z' }
         expect(response.parsed_body['count']).to eq(1)
       end
@@ -88,9 +88,10 @@ RSpec.describe 'Counts API', type: :request do
   end
 
   it 'matches removed tags from the previous snapshot, not current post_tags' do
-    get '/counts/posts', params: { tag: tag.id, mode: 'details' }
+    get '/counts/posts', params: { tag: tag.id, latest: '0', mode: 'details' }
     expect(response.parsed_body['count']).to eq(2)
     expect(response.parsed_body['versions'].map { _1['version_no'] }).to eq([2, 1])
-    expect(response.parsed_body['versions'].first['tags'].sole['type']).to eq('removed')
+    expect(response.parsed_body['versions'].first['tags']).to be_empty
+    expect(response.parsed_body['versions'].last['tags'].sole['id']).to eq(tag.id)
   end
 end

backend/spec/requests/counts_table_spec.rb

@@ -0,0 +1,248 @@
+require 'rails_helper'
+
+RSpec.describe 'Counts table API', type: :request do
+  include_context 'Ainu locale'
+
+  let!(:actor) { create(:user, :member, name: 'Counts actor') }
+  let!(:record) { create(:post) }
+  let!(:tag) { create(:tag, primary_name: 'alpha', category: :general) }
+  let!(:external) { create(:external_tag, name: 'beta') }
+  let(:point) { '2025-01-01T00:00:00Z' }
+  let(:base) do
+    { resource: 'posts', definition: 'history', mode: 'details',
+      execution_at: point, timezone: 'UTC', locale: 'ja' }
+  end
+
+  before do
+    TagVersion.create!(tag:, version_no: 1, event_type: 'create', name: 'alpha',
+        category: 'general', aliases: '', parent_tag_ids: '',
+        names: { ja: { name: 'alpha', script_code: 'Jpan', aliases: [] } },
+        created_at: Time.utc(2023))
+    NicoTagVersion.create!(external_tag: external, version_no: 1,
+        event_type: 'create', name: 'beta', linked_tags: '', created_at: Time.utc(2023))
+    snapshots = [
+        { tag_id: tag.id, version_no: 1, name: 'alpha', category: 'general', sections: [] },
+        { external_tag_id: external.id, name: 'beta', sections: [] }]
+    [1, 2, 3].each do |number|
+      PostVersion.create!(post: record, version_no: number,
+          event_type: number == 1 ? 'create' : 'update', url: record.url,
+          title: "snapshot #{ number }", tags: '', parent_post_ids: '',
+          tags_json: snapshots.first(number == 1 ? 2 : (number == 2 ? 1 : 0)),
+          created_by_user: number == 3 ? nil : actor,
+          created_at: Time.utc(2024, 1, 31, 15) + (number - 1).hours)
+    end
+  end
+
+  def query(extra = {})
+    get '/counts/query', params: base.merge(extra)
+    expect(response).to have_http_status(:ok)
+    response.parsed_body
+  end
+
+  def axis(field, value, type: 'string', grain: nil, root: 'conditions')
+    result = { root => '', "#{ root }.0.field" => field,
+               "#{ root }.0.value_type" => type }
+    result["#{ root }.0.operator"] = 'axis_eq' if root == 'conditions'
+    result["#{ root }.0.value"] = value unless type == 'null'
+    result["#{ root }.0.grain"] = grain if grain
+    result
+  end
+
+  def versions(result) = result.fetch('versions').map { _1.fetch('version_no') }
+
+  it 'separates latest and history and defaults to stable detail ordering and limit 100' do
+    history = query
+    expect(versions(history)).to eq([1, 2, 3])
+    expect(history).to include('limit' => 100, 'count' => 3, 'output_count' => 3,
+        'visible_output_count' => 3, 'excluded_count' => 0)
+    expect(history['versions'].map { _1['latest'] }).to eq([false, false, true])
+    expect(versions(query(definition: 'latest'))).to eq([3])
+    expect(versions(query(limit: 1, page: 2))).to eq([2])
+    expect(versions(query(sort: 'version_no:desc', limit: 1))).to eq([3])
+  end
+
+  it 'counts regular pivot rows separately from totals and from underlying records' do
+    total = query(mode: 'summary', rows: '', cols: '')
+    expect(total).to include('count' => 3, 'output_count' => 1, 'group_count' => 1)
+    expect(total['cells']).to eq([{ 'values' => [], 'count' => 3 }])
+    pivot = query(mode: 'summary', rows: 'event_type', cols: '', sort: '', limit: 1)
+    expect(pivot).to include('group_count' => 2, 'visible_output_count' => 2)
+    expect(pivot['row_headers'].count { _1['kind'] == 'data' }).to eq(1)
+    expect(pivot['row_headers']).to include(hash_including('kind' => 'grand_total'))
+    expect(query(mode: 'summary', rows: '', cols: 'event_type', sort: '')['output_count']).to eq(1)
+  end
+
+  it 'preserves timezone, NULL and legacy drill semantics and permits condition removal' do
+    month = axis('created_at', '2024-02', grain: 'month')
+    expect(versions(query(month.merge(timezone: 'Asia/Tokyo')))).to eq([1, 2, 3])
+    expect(versions(query(month))).to eq([])
+    old = axis('created_at', '2024-02', grain: 'month', root: 'drill')
+    expect(versions(query(old.merge(timezone: 'Asia/Tokyo')))).to eq([1, 2, 3])
+    expect(versions(query(old.merge(month).merge(timezone: 'Asia/Tokyo')))).to eq([1, 2, 3])
+    expect(versions(query(axis('user', nil, type: 'null')))).to eq([3])
+    expect(versions(query(axis('changed_field', 'title')))).to eq([2, 3])
+    expect(versions(query)).to eq([1, 2, 3])
+  end
+
+  it 'evaluates latest before filtering the version set' do
+    predicate = { conditions: '', 'conditions.0.field' => 'latest',
+                  'conditions.0.operator' => 'eq', 'conditions.0.value' => 'false' }
+    expect(versions(query(predicate))).to eq([1, 2])
+    expect(versions(query(predicate.merge('conditions.0.value' => 'true')))).to eq([3])
+  end
+
+  it 'keeps ANY, ALL and NONE distinct without multiplying parent records' do
+    values = { conditions: '', 'conditions.0.field' => 'tags',
+               'conditions.0.values' => '1', condition_values: '',
+               'condition_values.0.condition' => '0',
+               'condition_values.0.value_type' => 'string',
+               'condition_values.0.value' => "internal:#{ tag.id }",
+               'condition_values.1.condition' => '0',
+               'condition_values.1.value_type' => 'string',
+               'condition_values.1.value' => "external:#{ external.id }" }
+    { 'any' => [1, 2], 'all' => [1], 'none' => [3] }.each do |operator, expected|
+      expect(versions(query(values.merge('conditions.0.operator' => operator)))).to eq(expected)
+    end
+    result = query(axis('tags', "internal:#{ tag.id }"))
+    expect(result['versions'].first['tags'].length).to eq(2)
+  end
+
+  it 'distinguishes IN, NOT IN, an empty selection and an unspecified selection' do
+    predicate = { conditions: '', 'conditions.0.field' => 'version_no',
+                  'conditions.0.operator' => 'in', 'conditions.0.values' => '1',
+                  condition_values: '', 'condition_values.0.condition' => '0',
+                  'condition_values.0.value_type' => 'number',
+                  'condition_values.0.value' => '1' }
+    expect(versions(query(predicate))).to eq([1])
+    expect(versions(query(predicate.merge('conditions.0.operator' => 'not_in')))).to eq([2, 3])
+    empty = predicate.reject { |key, _value| key.to_s.start_with?('condition_values.') }
+    expect(versions(query(empty))).to be_empty
+    expect(versions(query(empty.except('conditions.0.values')))).to eq([1, 2, 3])
+  end
+
+  it 'canonicalises unreferenced tags while preserving partial stable references' do
+    reference = { tag_refs: '', 'tag_refs.0.name' => 'alpha',
+                  'tag_refs.0.tag_id' => tag.id.to_s }
+    expect(versions(query(tags: 'alpha'))).to eq([1, 2])
+    expect(versions(query(reference.merge(tags: 'alpha nico:beta')))).to eq([1])
+    expect(versions(query(reference.merge(tags: 'nico:beta alpha')))).to eq([1])
+    expect(versions(query(reference.merge(tags: 'alpha not:nico:beta')))).to eq([2])
+    expect(versions(query(reference.merge(tags: 'alpha nico:beta', match: 'any')))).to eq([1, 2])
+    expect(versions(query(tags: 'not:alpha'))).to eq([3])
+    get '/counts/query', params: base.merge(reference).merge(tags: 'different')
+    expect(response).to have_http_status(:bad_request)
+  end
+
+  it 'rejects malformed structured conditions and axes without accepting arbitrary SQL' do
+    [
+        { rows: '[{"field":"user"}]' }, { rows: 'user user' },
+        { rows: 'user:month' }, { rows: 'password' }, { limit: 101 }, { limit: 0 },
+        { page: '1x' }, { conditions: 'eyJmaWVsZCI6InVzZXIifQ==' },
+        { conditions: '', 'conditions.1.field' => 'user' },
+        axis('password', '1'), axis('changed_field', 'title').merge(definition: 'latest'),
+        axis('user', 'yes', type: 'boolean'),
+        { conditions: '', 'conditions.0.field' => 'title',
+          'conditions.0.operator' => 'eq', 'conditions.0.value' => 'x' * 8193 }].each do |invalid|
+      get '/counts/query', params: base.merge(invalid)
+      expect(response).to have_http_status(:bad_request), invalid.inspect
+    end
+  end
+
+  it 'rejects duplicate URL keys and JSON query payloads at the HTTP boundary' do
+    ['resource=posts&limit=20&limit=50', 'resource=posts&headers=%5B%22Id.%22%5D',
+     'resource=posts&limit%5B%5D=20'].each do |query_string|
+      get "/counts/query?#{ query_string }"
+      expect(response).to have_http_status(:bad_request)
+    end
+  end
+
+  it 'reports column overflow separately from malformed input' do
+    101.times do |index|
+      PostVersion.create!(post: record, version_no: index + 4,
+          event_type: 'update', url: record.url, title: "column #{ index }",
+          tags: '', tags_json: [], parent_post_ids: '', created_at: Time.utc(2024, 3))
+    end
+    get '/counts/query', params: base.merge(mode: 'summary', rows: '', cols: 'title', sort: '')
+    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response.parsed_body).to eq('error' => 'too_many_columns', 'max_columns' => 100)
+  end
+
+  it 'defines all six resources with filterable output fields and shared detail defaults' do
+    locale
+    CountsResourceDefinition::DEFINITIONS.each_key do |resource|
+      get "/counts/definitions/#{ resource }", params: { locale: 'ain-Kana' }
+      expect(response).to have_http_status(:ok)
+      body = response.parsed_body
+      filters = body['filter_fields'].map { _1['key'] }
+      walk = lambda do |fields, prefix|
+        fields.each do |field|
+          key = [prefix, field['key']].compact.join('.')
+          expect(filters).to include(key)
+          walk.call(field.fetch('children', []), key)
+        end
+      end
+      walk.call(body['output_fields'], nil)
+      defaults = body['defaults'].select { _1['mode'] == 'details' }
+      expect(defaults.map { _1['definition'] }).to eq(['latest', 'history'])
+      expect(defaults.first['params']).to eq(defaults.last['params'])
+      settings = defaults.first['params'].to_h { [_1['key'], _1['value']] }
+      expect(settings['sort']).to eq('resource_id:asc version_no:asc')
+      if resource == 'posts'
+        expect(settings['children'].split).to eq(['tags.name_ain', 'parents.id'])
+      end
+      keys = body['name_columns'].map { _1['key'] }
+      languages = Language.order(:created_at, :code).pluck(:code)
+      expect(keys).to eq(languages.map { "name_#{ _1 }" } + languages.map { "aliases_#{ _1 }" })
+    end
+  end
+
+  [nil, :guest, :member, :admin].each do |role|
+    context "authority #{ role || 'anonymous' }" do
+      before do
+        sign_in_as(create(:user, role)) if role
+        # Equal timestamps deliberately require version ordering, not a date comparison.
+        ['discard', 'restore', 'discard', 'restore'].each_with_index do |event, index|
+          PostVersion.create!(post: record, version_no: index + 4, event_type: event,
+              url: record.url, title: event == 'restore' ? 'restored' : 'private snapshot',
+              tags: '', tags_json: [], parent_post_ids: '', created_at: Time.utc(2024, 3))
+        end
+      end
+
+      it 'keeps every earlier discard boundary private but counts denied records' do
+        result = query
+        expected = role == :admin ? (1..7).to_a : [7]
+        expect(versions(result)).to eq(expected)
+        expect(result).to include('output_count' => 7,
+            'visible_output_count' => expected.length, 'excluded_count' => 7 - expected.length)
+        expect(response.headers['Cache-Control']).to include('no-store')
+        expect(response.body).not_to include('private snapshot') unless role == :admin
+      end
+
+      it 'applies the same version boundary to the ordinary history endpoint and old values' do
+        get '/posts/versions', params: { post: record.id, locale: 'ja' }
+        expect(response).to have_http_status(:ok)
+        rows = response.parsed_body.fetch('versions')
+        expect(rows.map { _1['version_no'] }).to eq(role == :admin ? (1..7).to_a.reverse : [7])
+        unless role == :admin
+          expect(rows.sole.dig('title', 'prev')).to be_nil
+          expect(response.body).not_to include('private snapshot')
+        end
+      end
+
+      it 'does not resolve private condition names even when the result set is empty' do
+        TagVersion.create!(tag:, version_no: 2, event_type: 'discard', name: 'secret tag',
+            category: 'general', aliases: '', parent_tag_ids: '',
+            names: { ja: { name: 'secret tag', script_code: 'Jpan', aliases: [] } },
+            created_at: Time.utc(2024, 2))
+        result = query(axis('tags', "internal:#{ tag.id }").merge(definition: 'latest'))
+        expect(result['versions']).to be_empty
+        expected = role == :admin ? { "internal:#{ tag.id }" => 'secret tag' } : {}
+        expect(result['condition_labels']['tags']).to eq(expected)
+        get '/counts/definitions/posts/candidates', params: {
+            field: 'tags', query: 'secret', execution_at: point, locale: 'ja' }
+        expect(response).to have_http_status(:ok)
+        expect(response.parsed_body['rows']).to be_empty
+      end
+    end
+  end
+end

backend/spec/services/counts_export_spec.rb

@@ -0,0 +1,168 @@
+require 'rails_helper'
+require 'tmpdir'
+require 'csv'
+
+RSpec.describe 'Counts export contracts' do
+  include ActiveSupport::Testing::TimeHelpers
+  let(:payload) do
+    { 'resource' => 'posts', 'definition' => 'history', 'mode' => 'details',
+      'locale' => 'ja', 'execution_at' => '2024-03-01T00:00:00Z',
+      'columns' => 'title', 'headers' => '["Title"]', 'format' => 'json' }
+  end
+
+  around do |example|
+    Dir.mktmpdir('counts-export-spec') do |path|
+      allow(CountsExportDownload).to receive(:directory).and_return(Pathname.new(path))
+      HistoryAccess.set(user: nil) { example.run }
+    end
+  end
+
+  context 'serialization after the authorised query' do
+    let(:rows) { [{ title: "=formula\n\"quoted\"" }, { title: 'second' }] }
+    let(:page) do
+      { count: 2, output_count: 2, visible_output_count: 2, page: 1, limit: 100,
+        versions: rows, execution_at: payload.fetch('execution_at') }
+    end
+
+    before do
+      query = CountsTableQuery.new(payload.slice(*CountsTableQuery::KEYS))
+      # SQL/authority are exercised in request specs; this unit boundary supplies their page.
+      allow(query).to receive(:each_page) do |before_page:, &block|
+        before_page.call
+        block.call(page)
+      end
+      allow(CountsTableQuery).to receive(:new).and_return(query)
+      allow(ApplicationRecord).to receive(:transaction).with(isolation: :repeatable_read).and_yield
+    end
+
+    it 'reports aggregation, actual output progress and regular-row metadata' do
+      progress = []
+      phases = []
+      body = CountsTableExport.new(payload).body(
+          progress: ->(done, total) { progress << [done, total] },
+          phase: ->(value) { phases << value }).to_a.join
+      result = JSON.parse(body)
+      expect(result['data']).to eq(rows.map(&:stringify_keys))
+      expect(result['metadata']).to include('logical_count_unit' => 'regular_result_rows',
+          'aggregate_records_in_logical_count' => false, 'output_count' => 2)
+      expect(phases).to eq(['aggregating', 'writing'])
+      expect(progress).to include([0, 2], [1, 2], [2, 2])
+      expect(progress.last).to eq([2, 2])
+    end
+
+    it 'preserves CSV multiline text and quotes while neutralising spreadsheet formulas' do
+      body = CountsTableExport.new(payload.merge('format' => 'csv')).body.to_a.join
+      expect(CSV.parse(body.delete_prefix("\uFEFF")))
+          .to eq([['Title'], ["'=formula\n\"quoted\""], ['second']])
+    end
+
+    it 'completes an isolated worker job with its real processed count and cancellable file' do
+      CountsExportJobs.pulse
+      token = CountsExportJobs.start(payload, 'owner', 'ja')
+      id = CountsExportJobs.authorised_id(token, 'owner')
+      state = CountsExportJobs.read(id).merge('status' => 'running', 'phase' => 'aggregating')
+      CountsExportJobs.write(state)
+      # Invoke the worker entrypoint directly; never fork or start an external worker in specs.
+      CountsExportJobs.perform(state)
+      ready = CountsExportJobs.status(token, 'owner')
+      expect(ready).to include('status' => 'ready', 'processed' => 2, 'total' => 2)
+      file = CountsExportDownload.find(ready.fetch('token'), 'owner')
+      expect(JSON.parse(File.read(file.fetch('path')))['data'].length).to eq(2)
+      CountsExportJobs.status(token, 'owner', cancel: true)
+      expect(CountsExportDownload.find(ready.fetch('token'), 'owner')).to be_nil
+    end
+
+    it 'marks a generation exception as failed without issuing a download token' do
+      CountsExportJobs.pulse
+      token = CountsExportJobs.start(payload, 'owner', 'ja')
+      id = CountsExportJobs.authorised_id(token, 'owner')
+      state = CountsExportJobs.read(id).merge('status' => 'running')
+      CountsExportJobs.write(state)
+      allow(CountsExportDownload).to receive(:prepare).and_raise(CountsExportDownload::TooLarge)
+      CountsExportJobs.perform(state)
+      expect(CountsExportJobs.status(token, 'owner')).to include('status' => 'failed')
+      expect(CountsExportJobs.status(token, 'owner')).not_to have_key('token')
+    end
+  end
+
+  it 'retains multilingual names and all inner rows in JSON with one selected display column' do
+    names = [{ language_code: 'ja', name: 'alpha', script_code: 'Jpan', aliases: [] },
+             { language_code: 'ain', name: 'recorded', script_code: 'Kana',
+               aliases: [{ name: 'alias', script_code: 'Latn' }] }]
+    rows = [{ id: 1, name_ja: 'alpha', names: }, { id: 2, name_ja: 'beta', names: }]
+    projection = CountsExportProjection.new(payload.merge('columns' => 'tags',
+        'headers' => '["Tags"]', 'children' => 'tags.name_ja'),
+        resource: 'posts', summary: false, tags: false)
+    result = projection.project({ tags: rows })
+    expect(result['tags'].length).to eq(2)
+    expect(result['tags'].map { _1['name_ja'] }).to eq(['alpha', 'beta'])
+    expect(result['tags'].map { _1['names'] }).to eq([names, names])
+  end
+
+  it 'requires a live worker, enforces queue capacity and binds jobs to their owner' do
+    expect { CountsExportJobs.start(payload, 'owner', 'ja') }
+        .to raise_error(CountsExportJobs::WorkerUnavailable)
+    CountsExportJobs.pulse
+    token = CountsExportJobs.start(payload, 'owner', 'ja')
+    expect(CountsExportJobs.status(token, 'other')).to be_nil
+    expect(CountsExportJobs.status(token, 'owner')).to include(
+        'status' => 'queued', 'phase' => 'queued', 'processed' => 0, 'total' => nil)
+    (CountsExportDownload::MAX_CONCURRENT_EXPORTS - 1).times do
+      CountsExportJobs.start(payload, 'owner', 'ja')
+    end
+    expect { CountsExportJobs.start(payload, 'owner', 'ja') }
+        .to raise_error(CountsExportDownload::Busy)
+    expect(CountsExportJobs.status(token, 'owner', cancel: true)['status']).to eq('cancelled')
+  end
+
+  it 'fails stale queued/running jobs and preserves actual progress without a fake total' do
+    CountsExportJobs.pulse
+    token = CountsExportJobs.start(payload, 'owner', 'ja')
+    id = CountsExportJobs.authorised_id(token, 'owner')
+    state = CountsExportJobs.read(id)
+    state.merge!('status' => 'running', 'phase' => 'aggregating')
+    CountsExportJobs.write(state)
+    CountsExportJobs.checkpoint(id, 5, nil, phase: 'writing')
+    expect(CountsExportJobs.status(token, 'owner')).to include(
+        'phase' => 'writing', 'processed' => 5, 'total' => nil)
+    state = CountsExportJobs.read(id)
+    state['heartbeat_at'] = (Time.current - CountsExportJobs::HEARTBEAT_SECONDS - 1).to_f
+    CountsExportJobs.write(state)
+    expect(CountsExportJobs.status(token, 'owner')).to include(
+        'status' => 'failed', 'error' => 'worker_stalled', 'processed' => 5)
+    expect { CountsExportJobs.checkpoint(id, 6) }.to raise_error(CountsExportJobs::Cancelled)
+  end
+
+  it 'revokes an already generated download on a new discard and rejects wrong owners' do
+    exporter = instance_double(CountsExporter, resource: 'posts', format: 'json', body: ['{}'])
+    token = CountsExportDownload.prepare(exporter, 'owner')
+    expect(CountsExportDownload.find(token, 'owner')).not_to be_nil
+    expect(CountsExportDownload.find(token, 'other')).to be_nil
+    post = create(:post)
+    PostVersion.create!(post:, version_no: 1, event_type: 'discard', url: post.url,
+        title: 'private', tags: '', tags_json: [], parent_post_ids: '', created_at: Time.utc(2024))
+    expect(CountsExportDownload.find(token, 'owner')).to be_nil
+  end
+
+  it 'rejects oversized output and removes its partial file' do
+    stub_const('CountsExportDownload::MAX_FILE_BYTES', 4)
+    exporter = instance_double(CountsExporter, resource: 'posts', format: 'json', body: ['12345'])
+    expect { CountsExportDownload.prepare(exporter, 'owner') }
+        .to raise_error(CountsExportDownload::TooLarge)
+    expect(Dir.glob(CountsExportDownload.directory.join('counts-*'))).to be_empty
+  end
+
+  it 'expires queued work after worker loss and rejects expired download signatures' do
+    CountsExportJobs.pulse
+    token = CountsExportJobs.start(payload, 'owner', 'ja')
+    travel_to(Time.current + CountsExportJobs::HEARTBEAT_SECONDS + 1) do
+      expect(CountsExportJobs.status(token, 'owner')).to include(
+          'status' => 'failed', 'error' => 'worker_unavailable')
+    end
+    exporter = instance_double(CountsExporter, resource: 'posts', format: 'json', body: ['{}'])
+    download = CountsExportDownload.prepare(exporter, 'owner')
+    travel_to(Time.current + CountsExportDownload::EXPIRY + 1) do
+      expect(CountsExportDownload.find(download, 'owner')).to be_nil
+    end
+  end
+end

backend/spec/services/query_state_spec.rb

@@ -0,0 +1,33 @@
+require 'rails_helper'
+
+RSpec.describe QueryState do
+  it 'decodes typed axis values and keeps absence distinct from an empty set' do
+    { 'boolean' => ['false', false], 'number' => ['7', 7],
+      'string' => ['a b & c', 'a b & c'], 'null' => ['', nil] }.each do |type, (raw, expected)|
+      params = { 'conditions' => '', 'conditions.0.field' => 'user',
+                 'conditions.0.operator' => 'axis_eq',
+                 'conditions.0.value_type' => type, 'conditions.0.value' => raw }
+      expect(described_class.records(params, 'conditions').sole['value']).to eq(expected)
+    end
+    expect(described_class.records({}, 'conditions')).to eq([])
+    expect(described_class.records({ 'conditions' => '' }, 'conditions')).to eq([])
+    expect(described_class.records({ 'conditions' => '', 'conditions.0.values' => '1' },
+        'conditions')).to eq([{ 'values' => true }])
+  end
+
+  it 'rejects gaps, unknown keys, JSON, wrong types and oversized lists' do
+    [
+        { 'conditions' => '[]' }, { 'conditions' => '', 'conditions.1.field' => 'user' },
+        { 'conditions' => '', 'conditions.0.sql' => 'TRUE' },
+        { 'conditions' => '', 'conditions.0.blank' => 'true' },
+        { 'conditions' => '', 'conditions.0.value' => ['x'] },
+        { 'drill' => '', 'drill.0.field' => 'user', 'drill.0.value_type' => 'object' },
+        { 'conditions' => 'x' * 131_073 }].each do |params|
+      expect { described_class.validate!(params, ['conditions', 'drill']) }
+          .to raise_error(ArgumentError)
+    end
+    ['user user', 'user  title', ' user', (1..201).to_a.join(' ')].each do |value|
+      expect { described_class.list(value) }.to raise_error(ArgumentError)
+    end
+  end
+end

frontend/server.ssr.test.mjs

@@ -62,14 +62,37 @@ const responseFor = url => {
     return { locales: [{ code: 'ja', name: '日本語' }, { code: 'ain-Kana', name: 'アイヌ' }] }
   if (path === '/users/settings') return { theme: 'system', wiki_editor_mode: 'split' }
   if (path === '/users/theme_slots') return []
-  if (path === '/counts/posts' || path === '/counts/tags') {
-    const resource = path.endsWith ('posts') ? 'posts' : 'tags'
-    return { count: 1, page: 1, limit: 20, group_count: 1,
-      groups: [{ key: url.searchParams.get ('axis') === 'user' ? 1 : '2024-01',
-        name: null, count: 1 }],
-      versions: resource === 'posts'
-      ? [{ post_id: 1, version_no: 1, title: { current: `SSR count ${locale}` } }]
-      : [{ tag_id: 1, version_no: 1, name: { current: `SSR count ${locale}` } }] }
+  if (path.startsWith ('/counts/definitions/')) {
+    const resource = path.split ('/')[3]
+    const language = locale === 'ain-Kana' ? 'ain' : 'ja'
+    const names = ['ja', 'ain'].map (code => ({ key: `name_${code}`,
+      label: 'counts:localeName', name_locale: { code, language_code: code } }))
+    const columns = resource === 'posts' ? ['resource_id', 'title']
+      : ['resource_id', `name_${language}`]
+    return { fields: [{ key: 'resource_id', type: 'integer', nullable: false,
+      operators: ['eq', 'ne'] }],
+      output_fields: [{ key: 'resource_id', label: 'counts:columns.resourceId' },
+        ...(resource === 'posts' ? [{ key: 'title', label: 'counts:columns.postTitle' }] : names)],
+      name_columns: names, filter_fields: [], column_aliases: [], condition_aliases: [],
+      axes: { latest: ['resource_id'], history: ['resource_id'] }, grains: ['month'],
+      defaults: [
+        { definition: 'latest', mode: 'summary', params: [
+          { key: 'rows', value: '' }, { key: 'cols', value: '' }] },
+        ...['latest', 'history'].map (definition => ({ definition, mode: 'details', params: [
+          { key: 'columns', value: columns.join (' ') },
+          { key: 'sort', value: 'resource_id:asc version_no:asc' }] }))] }
+  }
+  if (path === '/counts/query') {
+    const header = { values: [], kind: 'data', depth: 0, axis_count: 0, label_key: null }
+    return { count: 1, page: 1, limit: 100, group_count: 1,
+      output_count: 1, visible_output_count: 1, excluded_count: 0,
+      excluded_count_scope: 'current_query', execution_at: date,
+      rows: [], cols: [], row_headers: [header], column_headers: [header],
+      column_values: [[]], cells: [{ values: [], count: 1 }], pivot_totals: [],
+      condition_labels: {}, axis_labels: {}, versions: [{ id: 1, resource_id: 1,
+        version_no: 1, latest: true, created_at: date, created_by_user: null,
+        title: 'SSR count', name_ja: 'SSR count', name_ain: 'SSR count',
+        names: [], aliases: [], parents: [], tags: [] }] }
   }
   if (path === '/posts') return { posts: [post (locale)], count: 1 }
   if (path === '/gekanator/posts') return { posts: [post (locale)] }
@@ -309,21 +332,24 @@ after (async () => {
   if (errors.length) throw new AggregateError (errors, 'SSR teardown failed')
 })
 
-test ('counts SSR renders history data and retains URL query state', async () => {
+test ('counts SSR uses query/definitions, noindex and the common site title', async () => {
   for (const locale of ['ja', 'ain-Kana']) {
     for (const resource of ['posts', 'tags']) {
-      const column = resource === 'posts' ? 'title' : 'name'
-      const query = `mode=details&columns=${column}&user_id=4`
+      const column = resource === 'posts' ? 'title' : (locale === 'ja' ? 'name_ja' : 'name_ain')
+      const query = `definition=history&mode=details&columns=resource_id+${column}&user_id=4`
       const result = await renderPage (`/${locale}/counts/${resource}?${query}`, origin, apiURL)
       assert.equal (result.status, 200)
-      assert.match (result.html, new RegExp (`SSR count ${locale}`))
+      assert.match (result.html, /SSR count/)
       assert.match (result.html, new RegExp (`/${locale}/${resource}/1`))
       assert.doesNotMatch (result.html, /counts:|columns\.changedAt|fields\.actor/)
-      assert.match (result.html, /aria-expanded="false"/)
-      if (locale === 'ain-Kana')
-        assert.match (result.html, /lang="ja"[^>]*>集計実行/)
-      assert.ok (requests.some (request => request.url.includes (`/counts/${resource}`)
-        && request.url.includes ('user_id=4') && request.url.includes (`locale=${locale}`)))
+      assert.match (result.head, /<meta[^>]*name="robots"[^>]*content="noindex"/)
+      assert.match (result.head, /<title[^>]*>[^<]*集計[^<]*\|[^<]*<\/title>/)
+      assert.ok (requests.some (request => {
+        const url = new URL (request.url, origin)
+        return url.pathname === '/counts/query' && url.searchParams.get ('resource') === resource
+          && url.searchParams.get ('user_id') === '4'
+          && url.searchParams.get ('locale') === locale
+      }))
     }
   }
 })

frontend/src/components/counts/CountsControls.test.tsx

@@ -0,0 +1,119 @@
+import { fireEvent, screen } from '@testing-library/react'
+import { useState } from 'react'
+import { describe, expect, it, vi } from 'vitest'
+
+import CountsControls from '@/components/counts/CountsControls'
+import CountsFieldTree from '@/components/counts/CountsFieldTree'
+import { CountsDefinitionContext } from '@/lib/countsDefinitions'
+import { normaliseCountsParams } from '@/lib/counts'
+import { readCountState, setCountState, encodeCountState } from '@/lib/queryState'
+import { postDefinition } from '@/test/fixtures/counts'
+import { renderWithProviders } from '@/test/render'
+
+vi.mock ('@/lib/api', async original => ({
+    ...await original<typeof import ('@/lib/api')> (), apiGet: vi.fn ().mockResolvedValue ([]) }))
+
+const appliedParams = (extra: Record<string, string> = {}) => normaliseCountsParams ('posts',
+    new URLSearchParams ({ mode: 'details', timezone: 'UTC', ...extra }), postDefinition)
+
+const renderControls = (params: URLSearchParams, labelsParams = params.toString ()) => {
+  const execute = vi.fn ()
+  const result = renderWithProviders (
+      <CountsDefinitionContext.Provider value={postDefinition}>
+	<CountsControls resource="posts" applied={params} open setOpen={vi.fn ()}
+	    execute={execute} reorder={vi.fn ()} displayJSON={vi.fn ()}
+	    displayRowNumbers={vi.fn ()} displayThumbnail={vi.fn ()}
+	    conditionLabels={{ tags: { 'internal:7': 'Resolved tag' } }}
+	    conditionLabelsParams={labelsParams}/>
+      </CountsDefinitionContext.Provider>, { route: '/ja/counts/posts' })
+  return { ...result, execute }
+}
+const submit = () => fireEvent.submit (
+    screen.getByRole ('button', { name: '集計実行' }).closest ('form')!)
+
+
+describe ('Counts filter draft', () => {
+  it ('uses labels only for the executed condition set', () => {
+    const params = appliedParams ()
+    setCountState (params, 'conditions', encodeCountState ('conditions', [
+	{ field: 'tags', operator: 'axis_eq', value: 'internal:7' }]))
+    const { execute } = renderControls (params)
+    expect (screen.getByText ('Resolved tag')).toBeInTheDocument ()
+    fireEvent.change (screen.getByRole ('textbox', { name: 'Id.' }), { target: { value: '9' } })
+    expect (screen.queryByText ('Resolved tag')).not.toBeInTheDocument ()
+    expect (screen.getByText ('…')).toBeInTheDocument ()
+    expect (screen.queryByText ('internal:7')).not.toBeInTheDocument ()
+    submit ()
+    expect (readCountState (execute.mock.lastCall![0], 'conditions', []))
+	.toEqual ([{ field: 'tags', operator: 'axis_eq', value: 'internal:7' }])
+  })
+
+  it ('removes a visible drill condition from the submitted URL state', () => {
+    const params = appliedParams ()
+    setCountState (params, 'conditions', encodeCountState ('conditions', [
+	{ field: 'created_at', grain: 'month', operator: 'axis_eq', value: '2026-10' }]))
+    const { execute } = renderControls (params)
+    expect (screen.getByText (/令和8年10月/)).toBeInTheDocument ()
+    fireEvent.click (screen.getByRole ('button', { name: '削除' }))
+    submit ()
+    expect (readCountState (execute.mock.lastCall![0], 'conditions', [])).toEqual ([])
+  })
+
+  it ('opens the existing add dialogue without inserting a condition immediately', () => {
+    const { execute } = renderControls (appliedParams ())
+    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
+    expect (screen.getByRole ('dialog')).toBeInTheDocument ()
+    expect (execute).not.toHaveBeenCalled ()
+    expect (document.querySelectorAll ('[role="dialog"] select.h-11').length).toBeGreaterThan (0)
+    expect (screen.queryByText ('pattern.input')).not.toBeInTheDocument ()
+  })
+
+  it ('retains stable references only for surviving search tokens', () => {
+    const params = appliedParams ({ tags: 'alpha beta' })
+    setCountState (params, 'tag_refs', encodeCountState ('tag_refs', [
+	{ name: 'alpha', tag_id: 7 }, { name: 'beta', external_tag_id: 8 }]))
+    const { execute } = renderControls (params)
+    const tags = screen.getByDisplayValue ('alpha beta')
+    fireEvent.change (tags, { target: { value: 'not:beta gamma alpha' } })
+    submit ()
+    expect (readCountState (execute.mock.lastCall![0], 'tag_refs', [])).toEqual ([
+	{ name: 'alpha', tag_id: 7 }, { name: 'not:beta', external_tag_id: 8, negative: true }])
+    fireEvent.change (tags, { target: { value: 'gamma' } })
+    submit ()
+    expect (readCountState (execute.mock.lastCall![0], 'tag_refs', [])).toEqual ([])
+    expect (execute.mock.lastCall![0].get ('tags')).toBe ('gamma')
+    expect (screen.queryByText (/internal:7|external:8/)).not.toBeInTheDocument ()
+  })
+})
+
+
+const FieldTree = () => {
+  const [params, setParams] = useState (() => appliedParams ({ columns: 'tags',
+      children: 'tags.name_ja' }))
+  return <CountsDefinitionContext.Provider value={postDefinition}>
+    <CountsFieldTree resource="posts" params={params} update={(key, value) => setParams (previous => {
+      const next = new URLSearchParams (previous)
+      next.set (key, value)
+      return next
+    })}/>
+    <output data-testid="fields">{params.toString ()}</output>
+  </CountsDefinitionContext.Provider>
+}
+
+it ('derives mixed parent selection and permits selecting all children again after clearing', () => {
+  renderWithProviders (<FieldTree/>, { route: '/ja/counts/posts' })
+  const parent = screen.getByRole ('checkbox', { name: 'タグ' })
+  expect (parent).toHaveAttribute ('aria-checked', 'mixed')
+  expect (parent).toBeEnabled ()
+  fireEvent.click (parent)
+  expect (parent).toBeChecked ()
+  fireEvent.click (parent)
+  expect (parent).not.toBeChecked ()
+  expect (parent).toBeEnabled ()
+  fireEvent.click (parent)
+  expect (parent).toBeChecked ()
+  const params = new URLSearchParams (screen.getByTestId ('fields').textContent ?? '')
+  expect (params.get ('children')?.split (' ')).toEqual ([
+      'tags.name_ja', 'tags.name_ain', 'tags.aliases_ja', 'tags.aliases_ain'])
+  expect (params.get ('columns')).toBe ('tags')
+})

frontend/src/components/counts/CountsNestedTable.tsx

@@ -72,7 +72,8 @@ const CountsNestedTable = (
 	{params.get ('nested_json') === '1' ? (
 	    <pre data-counts-scroll
 		aria-label={title.text} lang={title.language}
-		className="max-h-72 w-full overflow-auto whitespace-pre text-xs">
+		className="max-h-72 w-full overflow-y-auto whitespace-pre-wrap
+		[overflow-wrap:anywhere] font-sans text-xs">
 	      {JSON.stringify (countsNestedExport (rows, fields, path, params, locale))}
 	    </pre>) : (columns.length > 0 && rows.length > 0 && (
 	    <div data-counts-scroll

frontend/src/components/counts/CountsTable.test.tsx

@@ -0,0 +1,105 @@
+import { fireEvent, screen } from '@testing-library/react'
+import { describe, expect, it, vi } from 'vitest'
+
+import CountsNestedTable from '@/components/counts/CountsNestedTable'
+import CountsSelectableTable from '@/components/counts/CountsSelectableTable'
+import CountsTableLayout from '@/components/counts/CountsTableLayout'
+import { useCountsTableLayout } from '@/lib/countsTableLayout'
+import { renderWithProviders } from '@/test/render'
+
+import type { CountField } from '@/lib/counts'
+
+const renderTable = () => renderWithProviders (<CountsTableLayout>
+  <CountsSelectableTable family="details" columns={['resource_id', 'version_no']}
+      identity="stable" name={{ text: 'Grid', language: 'en' }}>
+    <tbody>
+      <tr><td><span>first</span> <span>cell</span></td><td>second</td></tr>
+      <tr><td>third</td><td><input aria-label="editor" defaultValue="editable"/></td></tr>
+    </tbody>
+  </CountsSelectableTable>
+</CountsTableLayout>, { route: '/ja/counts/posts' })
+
+
+describe ('Counts cell keyboard contract', () => {
+  it ('moves Home/End on rows and Ctrl+Home/End on columns with a stable Shift anchor', () => {
+    renderTable ()
+    const table = screen.getByRole ('grid', { name: 'Grid' })
+    table.focus ()
+    fireEvent.keyDown (table, { key: 'End' })
+    expect (screen.getByText ('second')).toHaveAttribute ('data-counts-selected')
+    fireEvent.keyDown (table, { key: 'End', ctrlKey: true, shiftKey: true })
+    expect (screen.getByText ('second')).toHaveAttribute ('data-counts-selected')
+    expect (screen.getByRole ('textbox').closest ('td')).toHaveAttribute ('data-counts-selected')
+    expect (screen.getByText ('third')).not.toHaveAttribute ('data-counts-selected')
+    fireEvent.keyDown (table, { key: 'Home' })
+    expect (screen.getByText ('third')).toHaveAttribute ('data-counts-selected')
+    fireEvent.keyDown (table, { key: 'Home', ctrlKey: true })
+    expect (screen.getByText ('first').closest ('td')).toHaveAttribute ('data-counts-selected')
+  })
+
+  it.each (['Enter', 'Escape']) ('leaves text mode with %s and restores the cell focus', key => {
+    renderTable ()
+    const table = screen.getByRole ('grid', { name: 'Grid' })
+    const cell = screen.getByText ('first').closest ('td')!
+    table.focus ()
+    fireEvent.keyDown (table, { key: 'Home' })
+    fireEvent.keyDown (table, { key: 'Enter' })
+    expect (cell).toHaveAttribute ('data-counts-text')
+    expect (window.getSelection ()?.toString ()).toBe ('first cell')
+    const setData = vi.fn ()
+    fireEvent.copy (table, { clipboardData: { setData } })
+    expect (setData).not.toHaveBeenCalled ()
+    fireEvent.keyDown (table, { key })
+    expect (cell).not.toHaveAttribute ('data-counts-text')
+    expect (cell).toHaveAttribute ('data-counts-selected')
+    expect (window.getSelection ()?.toString ()).toBe ('')
+    expect (table).toHaveFocus ()
+    fireEvent.copy (table, { clipboardData: { setData } })
+    expect (setData).toHaveBeenCalledWith ('text/plain', 'first cell')
+    expect (setData).toHaveBeenCalledWith ('text/html', expect.stringContaining ('first cell'))
+  })
+
+  it ('does not consume input keyboard events and uses the sum of column widths', () => {
+    renderTable ()
+    const input = screen.getByRole ('textbox')
+    input.focus ()
+    expect (fireEvent.keyDown (input, { key: 'Enter' })).toBe (true)
+    expect (input).toHaveFocus ()
+    expect (screen.getByRole ('grid', { name: 'Grid' })).toHaveStyle ({ width: '176px' })
+  })
+})
+
+
+const WidthControls = () => {
+  const layout = useCountsTableLayout ()
+  return <>
+    <output>{layout.width ('details', 'title')}</output>
+    <button onClick={() => layout.fit ('details', 'title', 1000)}>fit</button>
+    <button onClick={() => layout.resize ('details', 'title', 180)}>resize</button>
+  </>
+}
+
+it ('caps automatic header sizing and preserves manual widths on subsequent fitting', () => {
+  renderWithProviders (<CountsTableLayout><WidthControls/></CountsTableLayout>)
+  fireEvent.click (screen.getByRole ('button', { name: 'fit' }))
+  expect (screen.getByRole ('status')).toHaveTextContent ('640')
+  fireEvent.click (screen.getByRole ('button', { name: 'resize' }))
+  fireEvent.click (screen.getByRole ('button', { name: 'fit' }))
+  expect (screen.getByRole ('status')).toHaveTextContent ('180')
+})
+
+it ('wraps nested JSON without truncating, reordering or changing its data', () => {
+  const fields: CountField[] = [
+      { key: 'id', label: 'counts:columns.resourceId' },
+      { key: 'name', label: 'counts:columns.name' }]
+  const rows = [{ id: 1, name: `https://example.invalid/${'a'.repeat (300)}` },
+      { id: 2, name: 'line one\nline two "quoted"' }]
+  const params = new URLSearchParams ({ children: 'tags.id tags.name', nested_json: '1' })
+  const { container } = renderWithProviders (<CountsNestedTable rows={rows} fields={fields}
+      path="tags" resource="posts" title={{ text: 'Tags', language: 'en' }}
+      params={params} update={vi.fn ()}/>, { route: '/ja/counts/posts' })
+  const pre = container.querySelector ('pre')!
+  expect (pre.textContent).toBe (JSON.stringify (rows))
+  expect (pre).toHaveClass ('whitespace-pre-wrap', '[overflow-wrap:anywhere]', 'font-sans')
+  expect (pre).not.toHaveClass ('truncate', 'whitespace-pre', 'select-none')
+})

frontend/src/lib/counts.test.ts

@@ -1,41 +1,159 @@
 import { describe, expect, it } from 'vitest'
 
-import { columnsForCounts, countColumns, countsCSV, normaliseCountsParams } from '@/lib/counts'
+import { columnsForCounts, countColumns, countsCSV, countsDefinitionParams,
+    countsRequestParams, normaliseCountsParams, selectedCountChildren } from '@/lib/counts'
+import { countsConditionValue, countsNestedIsScalar, countsNestedScalarText }
+    from '@/lib/countsDisplay'
+import { countsClipboard } from '@/lib/countsClipboard'
 import { createUII18n, translateUIMessage } from '@/lib/i18n'
+import { encodeCountState, readCountState, setCountState } from '@/lib/queryState'
+import { isCountsPath } from '@/lib/routeLocales'
+import { nameColumns, postDefinition } from '@/test/fixtures/counts'
+
+import type { CountsCondition } from '@/lib/countsDefinitions'
 
 
-describe ('counts exports', () => {
-  it ('resolves every output and CSV header key in both locales', () => {
-    for (const locale of ['ja', 'ain-Kana'])
-    {
-      const instance = createUII18n (locale)
-      for (const key of Object.values (countColumns))
-      {
-	const translated = translateUIMessage (key, 'counts', locale, { }, instance)
-	expect (translated.text).not.toBe (key)
-	expect (translated.text).not.toContain ('counts:')
-      }
-      const fallback = translateUIMessage ('run', 'counts', locale, { }, instance)
-      expect (fallback).toEqual ({ text: '集計実行', language: 'ja' })
-    }
+describe ('Counts URL contract', () => {
+  it ('defaults to latest summary, limit 100, and no axes', () => {
+    const params = normaliseCountsParams ('posts', new URLSearchParams (), postDefinition)
+    expect (params.get ('definition')).toBe ('latest')
+    expect (params.get ('mode')).toBe ('summary')
+    expect (params.get ('limit')).toBe ('100')
+    expect (params.get ('rows')).toBe ('')
+    expect (params.get ('cols')).toBe ('')
+    expect (params.has ('axis')).toBe (false)
+    expect (normaliseCountsParams ('posts', params, postDefinition).toString ())
+	.toBe (params.toString ())
   })
 
-  it ('makes the monthly default explicit for the existing API', () => {
-    expect (normaliseCountsParams ('posts', new URLSearchParams ()).get ('axis'))
-	.toBe ('month')
+  it.each (['latest', 'history']) ('shares detail defaults for %s', definition => {
+    const params = normaliseCountsParams ('posts', new URLSearchParams ({
+	definition, mode: 'details' }), postDefinition)
+    expect (params.get ('sort')).toBe ('resource_id:asc version_no:asc')
+    expect ([...selectedCountChildren (params)]).toEqual (['tags.name_ja'])
+    expect (countsNestedIsScalar (nameColumns, 'tags', params)).toBe (true)
   })
 
-  it ('escapes quotes, newlines and spreadsheet formulas in UTF-8 CSV', () => {
-    expect (countsCSV ([['日本語', 'a"b', 'a\nb', '=1+1']]))
-	.toBe ('\uFEFF"日本語","a""b","a\nb","\'=1+1"')
+  it.each (['20', '50', '100']) ('preserves an explicit limit of %s and empty selections', limit => {
+    const params = normaliseCountsParams ('posts', new URLSearchParams ({
+	mode: 'details', limit, sort: '', columns: '', children: '', rows: '', cols: '' }),
+	postDefinition)
+    for (const key of ['sort', 'columns', 'children', 'rows', 'cols'])
+      expect (params.get (key)).toBe ('')
+    expect (params.get ('limit')).toBe (limit)
   })
 
-  it ('keeps resource-specific columns out of the other resource', () => {
-    expect (columnsForCounts ('posts')).toContain ('added_tags')
-    expect (columnsForCounts ('posts')).not.toContain ('aliases')
-    expect (columnsForCounts ('tags')).toContain ('aliases')
-    expect (columnsForCounts ('tags')).not.toContain ('url')
-    expect (columnsForCounts ('posts')).not.toContain ('event_type')
-    expect (columnsForCounts ('tags')).not.toContain ('event_type')
+  it ('normalises saved display keys without broadening script-specific predicates', () => {
+    const params = new URLSearchParams ({ mode: 'details', columns: 'tags',
+	children: 'tags.name_ain_kana tags.aliases_ja' })
+    setCountState (params, 'conditions', encodeCountState ('conditions', [
+	{ field: 'name_ain_kana', operator: 'eq', value: 'recorded' }]))
+    const result = normaliseCountsParams ('posts', params, postDefinition)
+    expect (result.get ('children')).toBe ('tags.name_ain tags.aliases_ja')
+    expect (result.get ('conditions.0.field')).toBe ('name_ain_kana')
+    expect (countsNestedIsScalar (nameColumns, 'tags', result)).toBe (false)
+  })
+
+  it ('unifies legacy drill conditions while keeping typed values, grain and execution time', () => {
+    const params = new URLSearchParams ({ execution_at: '2024-03-01T00:00:00Z',
+	timezone: 'Asia/Tokyo' })
+    const drills = [{ field: 'created_at', grain: 'month', value: '2024-02' },
+	{ field: 'user', value: null }, { field: 'resource_id', value: 7 },
+	{ field: 'flag', value: false }]
+    setCountState (params, 'drill', encodeCountState ('drill', drills))
+    const result = normaliseCountsParams ('posts', params)
+    expect (readCountState (result, 'conditions', []))
+	.toEqual (drills.map (entry => ({ ...entry, operator: 'axis_eq' })))
+    expect ([...result.keys ()].some (key => key === 'drill' || key.startsWith ('drill.')))
+	.toBe (false)
+    expect (result.get ('execution_at')).toBe (params.get ('execution_at'))
+    expect (result.get ('timezone')).toBe ('Asia/Tokyo')
+    setCountState (result, 'conditions', encodeCountState ('conditions', []))
+    expect (readCountState (result, 'conditions', [])).toEqual ([])
+  })
+
+  it ('round-trips free text and empty sets without JSON or delimiter splitting', () => {
+    const conditions: CountsCondition[] = [
+	{ field: 'title', operator: 'eq', value: 'a & b = c "quoted"' },
+	{ field: 'category', operator: 'in', input: 'list', values: [] },
+	{ field: 'version_no', operator: 'in', values: [1, 2] }]
+    const params = new URLSearchParams ()
+    setCountState (params, 'conditions', encodeCountState ('conditions', conditions))
+    expect (params.get ('conditions')).toBe ('')
+    expect (params.get ('conditions.0.value')).toBe (conditions[0].value)
+    expect (readCountState (params, 'conditions', [])).toEqual (conditions)
+    setCountState (params, 'conditions', encodeCountState ('conditions', [conditions[0]]))
+    expect ([...params.keys ()].some (key => key.startsWith ('condition_values'))).toBe (false)
+  })
+
+  it ('resets definition-dependent state but preserves timezone and row-number preference', () => {
+    const previous = new URLSearchParams ({ tags: 'alpha', rows: 'user', page: '4',
+	at: '2024-01-01', execution_at: '2024-02-01', timezone: 'Asia/Tokyo', row_numbers: '0' })
+    expect (Object.fromEntries (countsDefinitionParams ('history', previous))).toEqual ({
+	definition: 'history', mode: 'details', timezone: 'Asia/Tokyo', row_numbers: '0' })
+  })
+
+  it ('excludes presentation settings from API identity but retains extraction conditions', () => {
+    const params = new URLSearchParams ({ definition: 'history', columns: 'title',
+	children: 'tags.name_ja', order: 'title', nested_json: '1', row_numbers: '1',
+	resource_id: '7', limit: '50', sort: 'version_no:desc' })
+    expect (Object.fromEntries (countsRequestParams (params))).toEqual ({
+	definition: 'history', resource_id: '7', limit: '50', sort: 'version_no:desc' })
   })
 })
+
+
+describe ('Counts logical display and exports', () => {
+  it ('resolves output labels in both supported locales', () => {
+    for (const locale of ['ja', 'ain-Kana'])
+      for (const key of Object.values (countColumns))
+      {
+	const message = translateUIMessage (key, 'counts', locale, {}, createUII18n (locale))
+	expect (message.text).not.toBe (key)
+	expect (message.text).not.toContain ('counts:')
+      }
+    expect (columnsForCounts ('posts')).toContain ('event_type')
+    expect (columnsForCounts ('tags')).not.toContain ('aliases')
+  })
+
+  it ('distinguishes unresolved, inaccessible and registered condition names', () => {
+    const axis = { field: 'tags' }
+    expect (countsConditionValue ('internal:7', axis, 'ja', 'UTC')).toBe ('…')
+    expect (countsConditionValue ('internal:7', axis, 'ja', 'UTC', { tags: {} })).toBe ('—')
+    expect (countsConditionValue ('internal:7', axis, 'ja', 'UTC', {
+	tags: { 'internal:7': 'recorded tag' } })).toBe ('recorded tag')
+    expect (countsConditionValue (7, { field: 'user' }, 'ja', 'UTC', {
+	user: { '7': 'actor' } })).toBe ('actor')
+    expect (countsConditionValue ('title', { field: 'changed_field' }, 'ja', 'UTC'))
+	.toBe (translateUIMessage ('columns.postTitle', 'counts', 'ja').text)
+  })
+
+  it ('formats calendar grain values without changing their timezone or identifier', () => {
+    expect (countsConditionValue ('2026', { field: 'created_at', grain: 'year' },
+	'ja', 'Asia/Tokyo')).toContain ('令和8年')
+    expect (countsConditionValue ('2026-10', { field: 'created_at', grain: 'month' },
+	'ja', 'America/New_York')).toContain ('令和8年10月')
+  })
+
+  it ('keeps all inner rows when choosing one display column', () => {
+    const params = new URLSearchParams ({ children: 'tags.name_ja' })
+    const rows = [{ name_ja: 'alpha' }, { name_ja: 'beta' }]
+    expect (countsNestedScalarText (rows, nameColumns, 'tags', params, 'ja')).toBe ('alpha beta')
+    expect (rows).toEqual ([{ name_ja: 'alpha' }, { name_ja: 'beta' }])
+  })
+
+  it ('escapes CSV and clipboard formulas, quotes, newlines and HTML', () => {
+    expect (countsCSV ([['日本語', 'a"b', 'a\nb', '=1+1']]))
+	.toBe ('\uFEFF"日本語","a""b","a\nb","\'=1+1"')
+    const copy = countsClipboard ([['<tag>', 'first\nsecond', '=1+1']])
+    expect (copy.text).toBe ('<tag>\t"first\nsecond"\t\'=1+1')
+    expect (copy.html).toContain ('&lt;tag&gt;')
+    expect (copy.html).toContain ('first<br>second')
+    expect (copy.html).toContain ('&#39;=1+1')
+  })
+
+  it.each (['/counts', '/counts/posts?q=1', '/ja/counts/tags', '/ain-Kana/counts/materials']) (
+      'classifies %s as excluded from search and speculative loading', path => {
+	 expect (isCountsPath (path.split ('?')[0])).toBe (true)
+      })
+})

frontend/src/lib/prefetchers.test.ts

@@ -35,6 +35,18 @@ const qc = () => new QueryClient ({
 })
 
 describe ('prefetchForURL', () => {
+  it.each (['/counts', '/counts/posts?rows=user', '/ja/counts/tags',
+      '/ain-Kana/counts/materials?mode=details']) (
+      'does not prefetch Counts page %s', async path => {
+	const client = qc ()
+	const prefetch = vi.spyOn (client, 'prefetchQuery')
+	const fetch = vi.spyOn (client, 'fetchQuery')
+	await prefetchForURL (client, path)
+	expect (prefetch).not.toHaveBeenCalled ()
+	expect (fetch).not.toHaveBeenCalled ()
+	expect (client.getQueryCache ().getAll ()).toHaveLength (0)
+      })
+
   beforeEach (() => {
     vi.clearAllMocks ()
     postsApi.fetchPosts.mockResolvedValue ({ posts: [], count: 0 })

frontend/src/pages/CountsResourcePage.test.tsx

@@ -1,157 +1,106 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
+import { act, fireEvent, screen, waitFor } from '@testing-library/react'
+import { useLocation } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import CountsPage from '@/pages/CountsPage'
 import CountsResourcePage from '@/pages/CountsResourcePage'
+import { detailResult, executionAt, postDefinition } from '@/test/fixtures/counts'
 import { renderWithProviders } from '@/test/render'
 
 import type { CountsResult } from '@/lib/counts'
 
-const { fetchCounts, fetchTagByName } = vi.hoisted (() => ({
-    fetchCounts: vi.fn (), fetchTagByName: vi.fn () }))
-
-vi.mock ('@/lib/counts', async importOriginal => ({
-    ...await importOriginal<typeof import ('@/lib/counts')> (), fetchCounts }))
-vi.mock ('@/lib/tags', async importOriginal => ({
-    ...await importOriginal<typeof import ('@/lib/tags')> (), fetchTagByName }))
-
-
-beforeEach (() => {
-  fetchCounts.mockReset ()
-  fetchTagByName.mockReset ()
-  fetchCounts.mockResolvedValue ({ count: 0, groupCount: 0, groups: [], page: 1, limit: 20 })
-})
-
-
-const conditions = () => screen.getByRole ('button', { name: '集計条件' })
+const { fetchCounts, fetchCountsDefinition } = vi.hoisted (() => ({
+    fetchCounts: vi.fn (), fetchCountsDefinition: vi.fn () }))
 
+vi.mock ('@/lib/counts', async original => ({
+    ...await original<typeof import ('@/lib/counts')> (), fetchCounts }))
+vi.mock ('@/lib/countsDefinitions', async original => ({
+    ...await original<typeof import ('@/lib/countsDefinitions')> (), fetchCountsDefinition }))
 
+const Location = () => <output data-testid="location">{useLocation ().search}</output>
+const currentParams = () => new URLSearchParams (screen.getByTestId ('location').textContent ?? '')
 const execute = () => fireEvent.submit (
     screen.getByRole ('button', { name: '集計実行' }).closest ('form')!)
+const openConditions = () => fireEvent.click (screen.getByRole ('button', { name: '集計条件' }))
+const renderPage = (extra = '') => renderWithProviders (<>
+  <CountsResourcePage resource="posts"/><Location/>
+</>, { route: `/ja/counts/posts?mode=details&timezone=UTC${extra}` })
+
+beforeEach (() => {
+  fetchCounts.mockReset ().mockResolvedValue (detailResult)
+  fetchCountsDefinition.mockReset ().mockResolvedValue (postDefinition)
+})
 
 
-describe ('counts workspace', () => {
-  it ('opens the posts workspace at the root with a resource sidebar', async () => {
-    renderWithProviders (<CountsPage/>, { route: '/ja/counts' })
-    fireEvent.click (screen.getByRole ('button', { name: '集計対象' }))
-    expect (screen.getByRole ('link', { name: '投稿' }))
-	.toHaveAttribute ('href', '/ja/counts/posts')
-    expect (screen.getByRole ('link', { name: '投稿' }))
-	.toHaveAttribute ('aria-current', 'page')
-    expect (screen.getByRole ('link', { name: 'タグ' }))
-	.toHaveAttribute ('href', '/ja/counts/tags')
-    expect (conditions ()).toHaveAttribute ('aria-expanded', 'false')
-    await waitFor (() => expect (fetchCounts.mock.lastCall?.[1].get ('axis')).toBe ('month'))
+describe ('Counts execution and URL state', () => {
+  it ('enriches the initial URL without a second query or removing the page shell', async () => {
+    renderPage ()
+    const heading = screen.getByRole ('heading', { name: '広場集計' })
+    await screen.findByText ('Recorded title')
+    await waitFor (() => expect (currentParams ().get ('execution_at')).toBe (executionAt))
+    expect (fetchCounts).toHaveBeenCalledTimes (1)
+    expect (screen.getByRole ('heading', { name: '広場集計' })).toBe (heading)
+    expect (screen.getByText ('件数：1 件')).toBeInTheDocument ()
+    expect (screen.queryByText (/閲覧権限のないレコード/)).not.toBeInTheDocument ()
+    expect (currentParams ().get ('limit')).toBe ('100')
   })
 
-  it ('preserves draft filters on collapse without querying until execution', async () => {
-    renderWithProviders (<CountsResourcePage resource="posts"/>, {
-	route: '/ja/counts/posts?page=3&mode=details' })
-    await screen.findByText ('履歴レコード件数：0')
-    const calls = fetchCounts.mock.calls.length
-    fireEvent.click (conditions ())
-    const output = document.querySelector ('[data-counts-output]')!
-    const filters = document.querySelector ('[data-counts-filters]')!
-    expect (output.compareDocumentPosition (filters) & Node.DOCUMENT_POSITION_FOLLOWING)
-	.toBeTruthy ()
-    fireEvent.change (screen.getByRole ('textbox', { name: '投稿 ID' }), {
-	target: { value: '7' } })
-    fireEvent.change (screen.getByRole ('textbox', { name: '操作者 ID' }), {
-	target: { value: '9' } })
-    fireEvent.click (conditions ())
-    expect (screen.getByRole ('table')).toBeInTheDocument ()
-    fireEvent.click (conditions ())
-    expect (screen.getByRole ('textbox', { name: '投稿 ID' })).toHaveValue ('7')
-    expect (fetchCounts).toHaveBeenCalledTimes (calls)
+  it ('keeps edits local until execution then commits the server timestamp and filters together',
+      async () => {
+	 renderPage ()
+	 await waitFor (() => expect (currentParams ().get ('execution_at')).toBe (executionAt))
+	 openConditions ()
+	 const input = screen.getByRole ('textbox', { name: 'Id.' })
+	 fireEvent.change (input, { target: { value: '7' } })
+	 fireEvent.change (screen.getByRole ('combobox', { name: '表示件数' }), {
+	     target: { value: '20' } })
+	 openConditions ()
+	 openConditions ()
+	 expect (input).toHaveValue ('7')
+	 expect (fetchCounts).toHaveBeenCalledTimes (1)
+	 expect (currentParams ().has ('resource_id')).toBe (false)
+	 let complete!: (result: CountsResult) => void
+	 fetchCounts.mockImplementationOnce (() => new Promise<CountsResult> (resolve => {
+	   complete = resolve
+	 }))
+	 const oldURL = currentParams ().toString ()
+	 execute ()
+	 await waitFor (() => expect (fetchCounts).toHaveBeenCalledTimes (2))
+	 expect (currentParams ().toString ()).toBe (oldURL)
+	 expect (screen.getByRole ('textbox', { name: 'Id.' })).toBe (input)
+	 await act (async () => complete ({ ...detailResult,
+	     executionAt: '2024-03-02T00:00:00.000000Z', limit: 20 }))
+	 await waitFor (() => expect (currentParams ().get ('resource_id')).toBe ('7'))
+	 expect (currentParams ().get ('limit')).toBe ('20')
+	 expect (currentParams ().has ('page')).toBe (false)
+	 expect (currentParams ().get ('execution_at')).toBe ('2024-03-02T00:00:00.000000Z')
+	 expect (fetchCounts).toHaveBeenCalledTimes (2)
+      })
+
+  it ('keeps the filter and identifier after a failed execution', async () => {
+    renderPage ()
+    await waitFor (() => expect (currentParams ().get ('execution_at')).toBe (executionAt))
+    openConditions ()
+    fireEvent.change (screen.getByRole ('textbox', { name: 'Id.' }), {
+	target: { value: '99' } })
+    fetchCounts.mockRejectedValueOnce (new Error ('offline'))
     execute ()
-    await waitFor (() => {
-      const params = fetchCounts.mock.lastCall?.[1] as URLSearchParams
-      expect (params.get ('resource_id')).toBe ('7')
-      expect (params.get ('user_id')).toBe ('9')
-      expect (params.has ('page')).toBe (false)
-    })
-    const refreshed = fetchCounts.mock.calls.length
-    execute ()
-    await waitFor (() => expect (fetchCounts.mock.calls.length).toBeGreaterThan (refreshed))
+    await screen.findByRole ('alert')
+    expect (screen.getByRole ('textbox', { name: 'Id.' })).toHaveValue ('99')
+    expect (currentParams ().has ('resource_id')).toBe (false)
   })
 
-  it ('applies selected columns only on execution and retains pagination state', async () => {
-    fetchCounts.mockResolvedValue ({ count: 21, page: 1, limit: 20,
-	versions: [{ postId: 7, versionNo: 2, url: { current: 'https://example.com' },
-	    title: { current: 'Snapshot' } }] as CountsResult['versions'] })
-    renderWithProviders (<CountsResourcePage resource="posts"/>, {
-	route: '/ja/counts/posts?axis=month&mode=details&columns=title&user_id=3' })
-    expect (await screen.findByRole ('cell', { name: 'Snapshot' })).toBeInTheDocument ()
-    expect (screen.getByLabelText ('次のページ')).toHaveAttribute (
-	'href', '/ja/counts/posts?axis=month&mode=details&columns=title&user_id=3&page=2')
-    fireEvent.click (conditions ())
-    expect (screen.getByRole ('checkbox', { name: '投稿タイトル' })).toBeChecked ()
-    fireEvent.click (screen.getByRole ('checkbox', { name: '投稿 URL' }))
-    expect (fetchCounts.mock.lastCall?.[1].get ('columns')).toBe ('title')
-    execute ()
-    await waitFor (() => {
-      expect (fetchCounts.mock.lastCall?.[1].get ('columns')).toBe ('title,url')
-    })
-  })
-
-  it ('removes legacy event fields and axes from public query state', async () => {
-    renderWithProviders (<CountsResourcePage resource="tags"/>, {
-	route: '/ja/counts/tags?axis=event_type&event_type=update&columns=event_type,name' })
-    await waitFor (() => {
-      const params = fetchCounts.mock.lastCall?.[1] as URLSearchParams
-      expect (params.get ('axis')).toBe ('month')
-      expect (params.has ('event_type')).toBe (false)
-      expect (params.get ('columns')).toBe ('name')
-    })
-    fireEvent.click (conditions ())
-    expect (screen.queryByText ('操作種別')).not.toBeInTheDocument ()
-    expect (screen.getByRole ('combobox', { name: '集計軸' })).toHaveValue ('month')
-  })
-
-  it ('resolves a tag name with the existing lookup before running the query', async () => {
-    fetchTagByName.mockResolvedValue ({ id: 12 })
-    renderWithProviders (<CountsResourcePage resource="posts"/>, {
-	route: '/ja/counts/posts' })
-    fireEvent.click (conditions ())
-    fireEvent.change (screen.getByRole ('textbox', { name: 'タグ名または ID' }), {
-	target: { value: '日本語タグ' } })
-    execute ()
-    await waitFor (() => expect (fetchCounts.mock.lastCall?.[1].get ('tag')).toBe ('12'))
-    expect (fetchTagByName).toHaveBeenCalledWith ('日本語タグ', 'ja')
-  })
-
-  it ('uses Japanese fallback metadata in the Ainu workspace without exposing keys', async () => {
-    const { container } = renderWithProviders (<CountsResourcePage resource="tags"/>, {
-	route: '/ain-Kana/counts/tags' })
-    const title = screen.getByRole ('heading', { name: 'タグの集計・明細' })
-    expect (title.querySelector ('[lang="ja"]')).toHaveTextContent ('タグの集計・明細')
-    expect (conditions ().querySelector ('[lang="ja"]')).toBeInTheDocument ()
-    fireEvent.click (conditions ())
-    await screen.findByRole ('table')
-    expect (container.textContent).not.toMatch (/counts:|columns\.|fields\.|axes\./)
-  })
-
-  it ('drills through an actor group while preserving the existing filters', async () => {
-    fetchCounts.mockResolvedValue ({ count: 3, groupCount: 1, page: 1, limit: 20,
-	groups: [{ key: 9, name: 'Actor name', count: 3 }] })
-    renderWithProviders (<CountsResourcePage resource="posts"/>, {
-	route: '/ja/counts/posts?axis=user&resource_id=7' })
-    const link = await screen.findByRole ('link', { name: 'Actor name' })
-    const url = new URL (link.getAttribute ('href')!, 'http://localhost')
-    expect (url.searchParams.get ('resource_id')).toBe ('7')
-    expect (url.searchParams.get ('user_id')).toBe ('9')
-    expect (url.searchParams.get ('mode')).toBe ('details')
-  })
-
-  it ('keeps partial-month boundaries when drilling through to details', async () => {
-    fetchCounts.mockResolvedValue ({ count: 4, groupCount: 1, page: 1, limit: 20,
-	groups: [{ key: '2024-01', name: null, count: 4 }] })
-    renderWithProviders (<CountsResourcePage resource="tags"/>, {
-	route: '/ja/counts/tags?axis=month&from=2024-01-15T00:00Z' })
-    const link = await screen.findByRole ('link', { name: '2024-01' })
-    const url = new URL (link.getAttribute ('href')!, 'http://localhost')
-    expect (url.searchParams.get ('from')).toBe ('2024-01-15T00:00Z')
-    expect (url.searchParams.get ('before')).toBe ('2024-02-01T00:00Z')
-    expect (url.searchParams.get ('mode')).toBe ('details')
+  it.each (['initial', 'execution']) ('shows the server column limit on %s failure', async phase => {
+    const failure = { isAxiosError: true,
+	response: { status: 422, data: { error: 'too_many_columns', max_columns: 73 } } }
+    if (phase === 'initial') fetchCounts.mockRejectedValueOnce (failure)
+    renderPage ()
+    if (phase === 'execution')
+    {
+      await waitFor (() => expect (currentParams ().get ('execution_at')).toBe (executionAt))
+      fetchCounts.mockRejectedValueOnce (failure)
+      execute ()
+    }
+    expect (await screen.findByRole ('alert')).toHaveTextContent ('73')
+    expect (screen.getByRole ('alert')).toHaveTextContent ('列数が上限')
   })
 })

frontend/src/test/fixtures/counts.ts

@@ -0,0 +1,49 @@
+import type { CountField, CountsResult } from '@/lib/counts'
+import type { CountsDefinition } from '@/lib/countsDefinitions'
+
+// camelCase transport fixture for the definitions/query endpoints, not the legacy API.
+export const nameColumns: CountField[] = [
+    { key: 'name_ja', label: 'counts:localeName', labelValues: { language: '日本語' },
+      nameLocale: { code: 'ja', languageCode: 'ja' } },
+    { key: 'name_ain', label: 'counts:localeName', labelValues: { language: '北海道アイヌ語' },
+      nameLocale: { code: 'ain', languageCode: 'ain' } },
+    { key: 'aliases_ja', label: 'counts:localeAliases', labelValues: { language: '日本語' },
+      nameLocale: { code: 'ja', languageCode: 'ja' }, multipleValues: true },
+    { key: 'aliases_ain', label: 'counts:localeAliases', labelValues: { language: '北海道アイヌ語' },
+      nameLocale: { code: 'ain', languageCode: 'ain' }, multipleValues: true }]
+
+export const postDefinition: CountsDefinition = {
+    fields: [
+	{ key: 'resource_id', type: 'integer', nullable: false, operators: ['eq', 'ne'] },
+	{ key: 'version_no', type: 'integer', nullable: false, operators: ['eq'] },
+	{ key: 'title', type: 'string', nullable: true, operators: ['eq', 'like'] },
+	{ key: 'user', type: 'integer', nullable: true, operators: ['eq'] },
+	{ key: 'created_at', type: 'datetime', nullable: false, operators: ['eq', 'range'] }],
+    outputFields: [
+	{ key: 'resource_id', label: 'counts:columns.resourceId' },
+	{ key: 'version_no', label: 'counts:columns.version' },
+	{ key: 'latest', label: 'counts:columns.latest' },
+	{ key: 'title', label: 'counts:columns.postTitle' },
+	{ key: 'tags', label: 'counts:columns.tags', children: nameColumns }],
+    nameColumns,
+    columnAliases: [{ key: 'name_ain_kana', value: 'name_ain' }],
+    conditionAliases: [{ key: 'name_ain_kana', value: 'name_ain_kana' }],
+    axes: { latest: ['resource_id', 'created_at', 'user', 'tags'],
+	history: ['resource_id', 'created_at', 'user', 'tags', 'changed_field'] },
+    grains: ['year', 'month', 'day'],
+    defaults: [
+	{ definition: 'latest', mode: 'summary', params: [
+	    { key: 'rows', value: '' }, { key: 'cols', value: '' },
+	    { key: 'conditions', value: '' }] },
+	...['latest', 'history'].map (definition => ({ definition, mode: 'details', params: [
+	    { key: 'columns', value: 'resource_id version_no latest title tags' },
+	    { key: 'children', value: 'tags.name_ja' },
+	    { key: 'sort', value: 'resource_id:asc version_no:asc' }] }))] }
+
+export const executionAt = '2024-03-01T00:00:00.000000Z'
+export const detailResult: CountsResult = {
+    count: 1, page: 1, limit: 100, outputCount: 1, visibleOutputCount: 1,
+    excludedCount: 0, excludedCountScope: 'current_query', executionAt,
+    conditionLabels: {}, rows: [], cols: [], versions: [{
+	id: 10, resourceId: 7, versionNo: 1, latest: true, createdAt: executionAt,
+	createdByUser: null, title: 'Recorded title', parents: [], tags: [] }] }