AI: address issue #149

backend/db/migrate/20261115000000_add_post_count_index_to_tags.rb

@@ -1,5 +0,0 @@
-class AddPostCountIndexToTags < ActiveRecord::Migration[8.0]
-  def change
-    add_index :tags, :post_count
-  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_11_15_000000) do
+ActiveRecord::Schema[8.0].define(version: 2026_10_15_010000) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -630,7 +630,6 @@ ActiveRecord::Schema[8.0].define(version: 2026_11_15_000000) do
     t.integer "post_count", default: 0, null: false
     t.integer "version_no", null: false
     t.index ["deprecated_at"], name: "index_tags_on_deprecated_at"
-    t.index ["post_count"], name: "index_tags_on_post_count"
     t.check_constraint "(`deprecated_at` is null) or (`category` <> _utf8mb4'nico')", name: "chk_tags_deprecated_at_not_nico"
     t.check_constraint "`version_no` > 0", name: "chk_tags_version_no_positive"
   end

backend/spec/models/tag_spec.rb

@@ -2,19 +2,6 @@ require 'rails_helper'
 
 RSpec.describe Tag, type: :model do
   include WikiRecords
-
-  describe 'post_count index' do
-    it 'has a non-unique index on post_count alone' do
-      indexes = described_class.connection.indexes(described_class.table_name)
-
-      expect(indexes).to include(
-          have_attributes(
-              name: 'index_tags_on_post_count',
-              columns: ['post_count'],
-              unique: false))
-    end
-  end
-
   describe '#has_description?' do
     let(:tag) { create(:tag) }
 

frontend/src/components/PostEmbed.tsx

@@ -196,6 +196,27 @@ const PostEmbed: FC<Props> = (
       return <TwitterEmbed userId={userId} statusId={statusId}/>
     }
 
+  case 'tiktok.com':
+    {
+      const videoId = url.pathname.match (/^\/@[^/]+\/video\/(\d+)\/?$/)?.[1]
+      if (!(videoId))
+	break
+
+      if (embedAutoLoadMode === 'off')
+	return externalLink
+      if (shouldLoadEmbed === false)
+	return manualLoadControl
+
+      return (
+	  <iframe
+	      src={`https://www.tiktok.com/player/v1/${ encodeURIComponent (videoId) }`}
+	      title={post.title || post.url}
+	      width={325}
+	      height={578}
+	      className="max-w-full"
+	      allowFullScreen/>)
+    }
+
   case 'youtube.com':
     {
       const videoId = url.searchParams.get ('v')

frontend/src/components/layout/SidebarComponent.test.tsx

@@ -70,16 +70,6 @@ describe ('SidebarComponent', () => {
     vi.spyOn (HTMLElement.prototype, 'hasPointerCapture').mockReturnValue (true)
   })
 
-  it ('limits sidebar scrolling to desktop to avoid clipping mobile suggestions', () => {
-    renderSidebar ()
-
-    // jsdom has no layout; guard the responsive classes responsible for clipping.
-    const sidebar = screen.getByText ('Sidebar body')
-
-    expect (sidebar).not.toHaveClass ('overflow-y-auto')
-    expect (sidebar).toHaveClass ('md:overflow-y-auto')
-  })
-
   it ('uses maxWidth without applying the container main-width reserve twice', async () => {
     localStorage.setItem ('sidebar:test-sidebar:left:width', '700')
     const onWidthChange = vi.fn ()

frontend/src/components/layout/SidebarComponent.tsx

@@ -339,7 +339,7 @@ const SidebarComponent: FC<Props> = ({
 	  </style>
 	</Helmet>
 
-	<div className="h-full md:overflow-y-auto p-4 sidebar">
+	<div className="h-full overflow-y-auto p-4 sidebar">
 	  {children}
 	</div>
 

frontend/src/pages/tags/TagDetailPage.test.tsx

@@ -35,10 +35,6 @@ const renderPage = () =>
 describe ('TagDetailPage', () => {
   beforeEach (() => {
     vi.clearAllMocks ()
-    tagsApi.fetchTag.mockReset ()
-    api.apiPut.mockReset ()
-    api.isApiError.mockReset ()
-    toastApi.toast.mockReset ()
     api.isApiError.mockReturnValue (false)
   })
 
@@ -55,11 +51,8 @@ describe ('TagDetailPage', () => {
   })
 
   it ('submits edited tag fields', async () => {
-    const updatedTag = buildTag ({ id: 7, name: 'new', aliases: ['alias'] })
-    tagsApi.fetchTag
-	.mockResolvedValue (updatedTag)
-	.mockResolvedValueOnce (buildTag ({ id: 7, name: 'old' }))
-    api.apiPut.mockResolvedValueOnce (updatedTag)
+    tagsApi.fetchTag.mockResolvedValueOnce (buildTag ({ id: 7, name: 'old' }))
+    api.apiPut.mockResolvedValueOnce (buildTag ({ id: 7, name: 'new', aliases: ['alias'] }))
 
     renderPage ()