AI: address review on PR #460

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/server.ssr.test.mjs

@@ -2,6 +2,7 @@ import assert from 'node:assert/strict'
 import { createServer } from 'node:http'
 import { spawn } from 'node:child_process'
 import { after, before, test } from 'node:test'
+import { JSDOM } from 'jsdom'
 import { createServer as createViteServer } from 'vite'
 
 import { render } from './dist/server/entry-server.js'
@@ -402,6 +403,26 @@ test ('every canonical screen route returns page HTML without JavaScript', async
   }
 })
 
+test ('SSR HTML head includes reciprocal hreflang links with query parameters', async () => {
+  for (const locale of ['ja', 'ain-Kana']) {
+    const response = await fetch (`${httpOrigin}/${locale}/posts?page=2&limit=50`)
+    assert.equal (response.status, 200)
+    const dom = new JSDOM (await response.text ())
+    try
+    {
+      const links = [...dom.window.document.head.querySelectorAll ('link[rel="alternate"]')]
+      assert.deepEqual (links.map (link => ({
+        locale: link.getAttribute ('hreflang'), href: link.getAttribute ('href') })), [
+        { locale: 'ja', href: `${origin}/ja/posts?page=2&limit=50` },
+        { locale: 'ain-Kana', href: `${origin}/ain-Kana/posts?page=2&limit=50` }])
+    }
+    finally
+    {
+      dom.window.close ()
+    }
+  }
+})
+
 test ('YouTube posts return HTTP 200 with the embed rendered by SSR', async t => {
   for (const locale of ['ja', 'ain-Kana']) {
     await t.test (locale, async () => {

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/entry-server.tsx

@@ -1,6 +1,6 @@
 import { QueryClient, QueryClientProvider, dehydrate, skipToken } from '@tanstack/react-query'
 import { PassThrough } from 'node:stream'
-import { renderToPipeableStream } from 'react-dom/server'
+import { renderToPipeableStream, renderToStaticMarkup } from 'react-dom/server'
 import { HelmetProvider } from 'react-helmet-async'
 import { I18nextProvider } from 'react-i18next'
 import { createStaticHandler, createStaticRouter,
@@ -9,7 +9,7 @@ import { createStaticHandler, createStaticRouter,
 import { AppFrame, appRoutes, resolvePageRoute } from '@/App'
 import { apiGet, isApiError } from '@/lib/api'
 import { createUII18n } from '@/lib/i18n'
-import { fetchLocales, isLocaleCode, legacyLocalePath } from '@/lib/locales'
+import { fetchLocales, isLocaleCode, legacyLocalePath, switchLocalePath } from '@/lib/locales'
 import { localesKeys, sessionKeys } from '@/lib/queryKeys'
 import { withRenderContext } from '@/lib/renderContext.server'
 
@@ -171,8 +171,26 @@ export const render = async (
 	}))
       }
       const helmet = helmetContext.helmet!
+      const alternates = status === 200 && known != null
+	  ? await Promise.all (locales.locales.map (entry => entry.code)
+	      .filter (isLocaleCode)
+	      .filter (code => known.route.handle?.locale == null
+		  || known.route.handle.locale === code)
+	      .map (async targetLocale => {
+		const location = { pathname: url.pathname, search: url.search, hash: '' }
+		const path = targetLocale === locale
+		    ? url.pathname + url.search
+		    : (known.route.handle?.switchLocale != null
+		       ? await known.route.handle.switchLocale ({
+			   location, params: known.params, locale, targetLocale })
+		       : switchLocalePath (location, targetLocale))
+		return <link key={targetLocale} rel="alternate" hrefLang={targetLocale}
+		    href={new URL (path, origin).href}/>
+	      }))
+	  : []
       const head = [helmet.title, helmet.meta, helmet.link, helmet.style]
 	  .map (entry => entry.toString ()).join ('')
+	  + renderToStaticMarkup (<>{alternates}</>)
       const dehydrated = dehydrate (client, { shouldDehydrateQuery: query =>
 	  query.state.status !== 'pending'
 	  && query.meta?.clientOnly !== true

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 ()