Merge remote-branch 'misskey/develop'

2024-11-23 14:46:44 +09:00 · 2024-09-24 13:38:38 +09:00 · 2024-09-24 13:38:38 +09:00 · 22b04f2ab2
commit 22b04f2ab2
parent 2b6f6e431f 6378dfbffc
199 changed files with 7083 additions and 7198 deletions
--- a/.config/cypress-devcontainer.yml
+++ b/.config/cypress-devcontainer.yml
@ -103,6 +103,14 @@ redis:
 #  #prefix: example-prefix
 #  #db: 1

+#redisForReactions:
+#  host: redis
+#  port: 6379
+#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
+#  #pass: example-pass
+#  #prefix: example-prefix
+#  #db: 1
+
 #   ┌───────────────────────────┐
 #───┘ MeiliSearch configuration └─────────────────────────────

--- a/.config/docker_example.yml
+++ b/.config/docker_example.yml
@ -106,6 +106,14 @@ redis:
 #  #prefix: example-prefix
 #  #db: 1

+#redisForReactions:
+#  host: redis
+#  port: 6379
+#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
+#  #pass: example-pass
+#  #prefix: example-prefix
+#  #db: 1
+
 #   ┌───────────────────────────┐
 #───┘ MeiliSearch configuration └─────────────────────────────

--- a/.config/example.yml
+++ b/.config/example.yml
@ -172,6 +172,16 @@ redis:
 #  # You can specify more ioredis options...
 #  #username: example-username

+#redisForReactions:
+#  host: localhost
+#  port: 6379
+#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
+#  #pass: example-pass
+#  #prefix: example-prefix
+#  #db: 1
+#  # You can specify more ioredis options...
+#  #username: example-username
+
 #   ┌───────────────────────────┐
 #───┘ MeiliSearch configuration └─────────────────────────────

--- a/.devcontainer/devcontainer.yml
+++ b/.devcontainer/devcontainer.yml
@ -103,6 +103,14 @@ redis:
 #  #prefix: example-prefix
 #  #db: 1

+#redisForReactions:
+#  host: redis
+#  port: 6379
+#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
+#  #pass: example-pass
+#  #prefix: example-prefix
+#  #db: 1
+
 #   ┌───────────────────────────┐
 #───┘ MeiliSearch configuration └─────────────────────────────

--- a/.github/workflows/api-cherrypick-js.yml
+++ b/.github/workflows/api-cherrypick-js.yml
@ -21,7 +21,7 @@ jobs:
      - run: corepack enable

      - name: Setup Node.js
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@v4.0.4
        with:
          node-version-file: '.node-version'
          cache: 'pnpm'
--- a/.github/workflows/changelog-check.yml
+++ b/.github/workflows/changelog-check.yml
@ -14,7 +14,7 @@ jobs:
      - name: Checkout head
        uses: actions/checkout@v4.1.1
      - name: Setup Node.js
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@v4.0.4
        with:
          node-version-file: '.node-version'

--- a/.github/workflows/check-cherrypick-js-autogen.yml
+++ b/.github/workflows/check-cherrypick-js-autogen.yml
@ -28,7 +28,7 @@ jobs:

      - name: setup node
        id: setup-node
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@v4.0.4
        with:
          node-version-file: '.node-version'
          cache: pnpm
--- a/.github/workflows/check-spdx-license-id.yml
+++ b/.github/workflows/check-spdx-license-id.yml
@ -48,13 +48,15 @@ jobs:
            "packages/backend/migration"
            "packages/backend/src"
            "packages/backend/test"
-            "packages/frontend-shared/src"
+            "packages/frontend-shared/@types"
+            "packages/frontend-shared/js"
            "packages/frontend/.storybook"
            "packages/frontend/@types"
            "packages/frontend/lib"
            "packages/frontend/public"
            "packages/frontend/src"
            "packages/frontend/test"
+            "packages/frontend-embed/@types"
            "packages/frontend-embed/src"
            "packages/misskey-bubble-game/src"
            "packages/misskey-reversi/src"
--- a/.github/workflows/get-api-diff.yml
+++ b/.github/workflows/get-api-diff.yml
@ -33,7 +33,7 @@ jobs:
    - name: Install pnpm
      uses: pnpm/action-setup@v4
    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version: ${{ matrix.node-version }}
        cache: 'pnpm'
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@ -12,6 +12,8 @@ on:
      - packages/frontend-embed/**
      - packages/sw/**
      - packages/cherrypick-js/**
+      - packages/misskey-bubble-game/**
+      - packages/misskey-reversi/**
      - packages/shared/eslint.config.js
      - .github/workflows/lint.yml
  pull_request:
@ -22,6 +24,8 @@ on:
      - packages/frontend-embed/**
      - packages/sw/**
      - packages/cherrypick-js/**
+      - packages/misskey-bubble-game/**
+      - packages/misskey-reversi/**
      - packages/shared/eslint.config.js
      - .github/workflows/lint.yml
 jobs:
@ -33,7 +37,7 @@ jobs:
        fetch-depth: 0
        submodules: true
    - uses: pnpm/action-setup@v4
-    - uses: actions/setup-node@v4.0.3
+    - uses: actions/setup-node@v4.0.4
      with:
        node-version-file: '.node-version'
        cache: 'pnpm'
@ -53,6 +57,8 @@ jobs:
        - frontend-embed
        - sw
        - cherrypick-js
+        - misskey-bubble-game
+        - misskey-reversi
    env:
      eslint-cache-version: v1
      eslint-cache-path: ${{ github.workspace }}/node_modules/.cache/eslint-${{ matrix.workspace }}
@ -62,7 +68,7 @@ jobs:
        fetch-depth: 0
        submodules: true
    - uses: pnpm/action-setup@v4
-    - uses: actions/setup-node@v4.0.3
+    - uses: actions/setup-node@v4.0.4
      with:
        node-version-file: '.node-version'
        cache: 'pnpm'
@ -92,7 +98,7 @@ jobs:
        fetch-depth: 0
        submodules: true
    - uses: pnpm/action-setup@v4
-    - uses: actions/setup-node@v4.0.3
+    - uses: actions/setup-node@v4.0.4
      with:
        node-version-file: '.node-version'
        cache: 'pnpm'
--- a/.github/workflows/locale.yml
+++ b/.github/workflows/locale.yml
@ -19,7 +19,7 @@ jobs:
        fetch-depth: 0
        submodules: true
    - uses: pnpm/action-setup@v4
-    - uses: actions/setup-node@v4.0.3
+    - uses: actions/setup-node@v4.0.4
      with:
        node-version-file: '.node-version'
        cache: 'pnpm'
--- a/.github/workflows/on-release-created.yml
+++ b/.github/workflows/on-release-created.yml
@ -26,7 +26,7 @@ jobs:
      - name: Install pnpm
        uses: pnpm/action-setup@v4
      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@v4.0.4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'pnpm'
--- a/.github/workflows/report-api-diff.yml
+++ b/.github/workflows/report-api-diff.yml
@ -70,8 +70,16 @@ jobs:
      - id: out-diff
        name: Build diff Comment
        run: |
-          cat <<- EOF > ./output.md
-          이 PR에 의한 api.json 차이
+          HEADER="이 PR에 의한 api.json 차이"
+          FOOTER="[Get diff files from Workflow Page](https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID})"
+          DIFF_BYTES="$(stat ./api.json.diff -c '%s' | tr -d '\n')"
+
+          echo "$HEADER" > ./output.md
+
+          if (( "$DIFF_BYTES" <= 1 )); then
+            echo '차이점이 없습니다.' >> ./output.md
+          else
+            cat <<- EOF >> ./output.md
            <details>
            <summary>차이점은 여기에서 볼 수 있음</summary>

@ -79,9 +87,10 @@ jobs:
            $(cat ./api.json.diff)
            \`\`\`
            </details>
-
-          [Get diff files from Workflow Page](https://github.com/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID})
            EOF
+          fi
+
+          echo "$FOOTER" >> ./output.md
      - uses: thollander/actions-comment-pull-request@v2
        with:
          pr_number: ${{ steps.load-pr-num.outputs.pr-number }}
--- a/.github/workflows/storybook.yml
+++ b/.github/workflows/storybook.yml
@ -41,7 +41,7 @@ jobs:
    - name: Install pnpm
      uses: pnpm/action-setup@v4
    - name: Use Node.js 20.x
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version-file: '.node-version'
        cache: 'pnpm'
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@ -46,7 +46,7 @@ jobs:
    - name: Install FFmpeg
      uses: FedericoCarboni/setup-ffmpeg@v3
    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version: ${{ matrix.node-version }}
        cache: 'pnpm'
@ -93,7 +93,7 @@ jobs:
      - name: Install pnpm
        uses: pnpm/action-setup@v4
      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@v4.0.4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'pnpm'
--- a/.github/workflows/test-cherrypick-js.yml
+++ b/.github/workflows/test-cherrypick-js.yml
@ -31,7 +31,7 @@ jobs:
      - run: corepack enable

      - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@v4.0.4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'pnpm'
--- a/.github/workflows/test-frontend.yml
+++ b/.github/workflows/test-frontend.yml
@ -35,7 +35,7 @@ jobs:
    - name: Install pnpm
      uses: pnpm/action-setup@v4
    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version: ${{ matrix.node-version }}
        cache: 'pnpm'
@ -90,7 +90,7 @@ jobs:
    - name: Install pnpm
      uses: pnpm/action-setup@v4
    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version: ${{ matrix.node-version }}
        cache: 'pnpm'
--- a/.github/workflows/test-production.yml
+++ b/.github/workflows/test-production.yml
@ -25,7 +25,7 @@ jobs:
    - name: Install pnpm
      uses: pnpm/action-setup@v4
    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version: ${{ matrix.node-version }}
        cache: 'pnpm'
--- a/.github/workflows/validate-api-json.yml
+++ b/.github/workflows/validate-api-json.yml
@ -27,7 +27,7 @@ jobs:
    - name: Install pnpm
      uses: pnpm/action-setup@v4
    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4.0.3
+      uses: actions/setup-node@v4.0.4
      with:
        node-version: ${{ matrix.node-version }}
        cache: 'pnpm'
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -2,26 +2,36 @@

 ### General
 - Feat: UserWebhookとSystemWebhookのテスト送信機能を追加 (#14445)
+- Enhance: ユーザーによるコンテンツインポートの可否をロールポリシーで制御できるように

 ### Client
 - Feat: ノート単体・ユーザーのノート・クリップのノートの埋め込み機能
-  - 埋め込みコードやウェブサイトへの実装方法の詳細はMisskey Hubに掲載予定です
+  - 埋め込みコードやウェブサイトへの実装方法の詳細は https://misskey-hub.net/docs/for-users/features/embed/ をご覧ください
 - Enhance: サイズ制限を超過するファイルをアップロードしようとした際にエラーを出すように
 - Enhance: アイコンデコレーション管理画面にプレビューを追加
 - Enhance: コントロールパネル内のファイル一覧でセンシティブなファイルを区別しやすく
 - Enhance: ScratchpadにUIインスペクターを追加
 - Fix: サーバーメトリクスが2つ以上あるとリロード直後の表示がおかしくなる問題を修正
 - Fix: 月の違う同じ日はセパレータが表示されないのを修正
+- Fix: タッチ画面でレンジスライダーを操作するとツールチップが複数表示される問題を修正  
+  (Cherry-picked from https://github.com/taiyme/misskey/pull/265)
 - Fix: 縦横比が極端なカスタム絵文字を表示する際にレイアウトが崩れる箇所があるのを修正  
  (Cherry-picked from https://github.com/MisskeyIO/misskey/pull/725)
 - Fix: 設定変更時のリロード確認ダイアログが複数個表示されることがある問題を修正
+- Fix: ファイルの詳細ページのファイルの説明で改行が正しく表示されない問題を修正  
+  (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/commit/bde6bb0bd2e8b0d027e724d2acdb8ae0585a8110)

 ### Server
+- Feat: Misskey® Reactions Buffering Technology™ (RBT)により、リアクションの作成負荷を低減することが可能に
 - Fix: アンテナの書き込み時にキーワードが与えられなかった場合のエラーをApiErrorとして投げるように
  - この変更により、公式フロントエンドでは入力の不備が内部エラーとして報告される代わりに一般的なエラーダイアログで報告されます
 - Fix: ファイルがサイズの制限を超えてアップロードされた際にエラーを返さなかった問題を修正
 - Fix: 外部ページを解析する際に、ページに紐づけられた関連リソースも読み込まれてしまう問題を修正  
  (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/commit/26e0412fbb91447c37e8fb06ffb0487346063bb8)
+- Fix: `Retry-After`ヘッダーが送信されなかった問題を修正
+  (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/commit/8a982c61c01909e7540ff1be9f019df07c3f0624)
+- Fix: サーバーサイドのDOM解析完了時にリソースを開放するように
+	(Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/634)

 ## 2024.8.0

--- a/chart/files/default.yml
+++ b/chart/files/default.yml
@ -124,6 +124,14 @@ redis:
 #  #prefix: example-prefix
 #  #db: 1

+#redisForReactions:
+#  host: redis
+#  port: 6379
+#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
+#  #pass: example-pass
+#  #prefix: example-prefix
+#  #db: 1
+
 #   ┌───────────────────────────┐
 #───┘ MeiliSearch configuration └─────────────────────────────

--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@ -5547,6 +5547,22 @@ export interface Locale extends ILocale {
     * これ以上このクリップにノートを追加できません。
     */
    "clipNoteLimitExceeded": string;
+    /**
+     * パフォーマンス
+     */
+    "performance": string;
+    /**
+     * 変更あり
+     */
+    "modified": string;
+    /**
+     * 破棄
+     */
+    "discard": string;
+    /**
+     * {n}件の変更があります
+     */
+    "thereAreNChanges": ParameterizedString<"n">;
    /**
     * 未読の通知の数を表示する
     */
@ -6429,6 +6445,10 @@ export interface Locale extends ILocale {
         * 有効にすると、タイムラインがキャッシュされていない場合にDBへ追加で問い合わせを行うフォールバック処理を行います。無効にすると、フォールバック処理を行わないことでさらにサーバーの負荷を軽減することができますが、タイムラインが取得できる範囲に制限が生じます。
         */
        "fanoutTimelineDbFallbackDescription": string;
+        /**
+         * 有効にすると、リアクション作成時のパフォーマンスが大幅に向上し、データベースへの負荷を軽減することが可能です。ただし、Redisのメモリ使用量は増加します。
+         */
+        "reactionsBufferingDescription": string;
        /**
         * 問い合わせ先URL
         */
@ -7622,6 +7642,26 @@ export interface Locale extends ILocale {
             * アイコンデコレーションの最大取付個数
             */
            "avatarDecorationLimit": string;
+            /**
+             * アンテナのインポートを許可
+             */
+            "canImportAntennas": string;
+            /**
+             * ブロックのインポートを許可
+             */
+            "canImportBlocking": string;
+            /**
+             * フォローのインポートを許可
+             */
+            "canImportFollowing": string;
+            /**
+             * ミュートのインポートを許可
+             */
+            "canImportMuting": string;
+            /**
+             * リストのインポートを許可
+             */
+            "canImportUserLists": string;
        };
        "_condition": {
            /**
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@ -1381,6 +1381,10 @@ fromX: "{x}から"
 genEmbedCode: "埋め込みコードを生成"
 noteOfThisUser: "このユーザーのノート一覧"
 clipNoteLimitExceeded: "これ以上このクリップにノートを追加できません。"
+performance: "パフォーマンス"
+modified: "変更あり"
+discard: "破棄"
+thereAreNChanges: "{n}件の変更があります"
 showUnreadNotificationsCount: "未読の通知の数を表示する"
 showCatOnly: "キャット付きのみ"
 additionalPermissionsForFlash: "Playへの追加許可"
@ -1635,6 +1639,7 @@ _serverSettings:
  fanoutTimelineDescription: "有効にすると、各種タイムラインを取得する際のパフォーマンスが大幅に向上し、データベースへの負荷を軽減することが可能です。ただし、Redisのメモリ使用量は増加します。サーバーのメモリ容量が少ない場合、または動作が不安定な場合は無効にすることができます。"
  fanoutTimelineDbFallback: "データベースへのフォールバック"
  fanoutTimelineDbFallbackDescription: "有効にすると、タイムラインがキャッシュされていない場合にDBへ追加で問い合わせを行うフォールバック処理を行います。無効にすると、フォールバック処理を行わないことでさらにサーバーの負荷を軽減することができますが、タイムラインが取得できる範囲に制限が生じます。"
+  reactionsBufferingDescription: "有効にすると、リアクション作成時のパフォーマンスが大幅に向上し、データベースへの負荷を軽減することが可能です。ただし、Redisのメモリ使用量は増加します。"
  inquiryUrl: "問い合わせ先URL"
  inquiryUrlDescription: "サーバー運営者へのお問い合わせフォームのURLや、運営者の連絡先等が記載されたWebページのURLを指定します。"

@ -1975,6 +1980,11 @@ _role:
    canSearchNotes: "ノート検索の利用"
    canUseTranslator: "翻訳機能の利用"
    avatarDecorationLimit: "アイコンデコレーションの最大取付個数"
+    canImportAntennas: "アンテナのインポートを許可"
+    canImportBlocking: "ブロックのインポートを許可"
+    canImportFollowing: "フォローのインポートを許可"
+    canImportMuting: "ミュートのインポートを許可"
+    canImportUserLists: "リストのインポートを許可"
  _condition:
    roleAssignedTo: "マニュアルロールにアサイン済み"
    isLocal: "ローカルユーザー"
--- a/package.json
+++ b/package.json
@ -1,7 +1,7 @@
 {
 	"name": "cherrypick",
 	"version": "4.12.0-beta.1",
-	"basedMisskeyVersion": "2024.9.0-alpha.0",
+	"basedMisskeyVersion": "2024.9.0-alpha.7",
 	"codename": "nasubi",
 	"repository": {
 		"type": "git",
@ -60,11 +60,11 @@
 		"fast-glob": "3.3.2",
 		"ignore-walk": "6.0.5",
 		"js-yaml": "4.1.0",
-		"postcss": "8.4.40",
+		"postcss": "8.4.47",
 		"tar": "6.2.1",
-		"terser": "5.31.3",
-		"typescript": "5.5.4",
-		"esbuild": "0.23.0",
+		"terser": "5.33.0",
+		"typescript": "5.6.2",
+		"esbuild": "0.23.1",
 		"glob": "11.0.0"
 	},
 	"devDependencies": {
@ -73,11 +73,11 @@
 		"@typescript-eslint/eslint-plugin": "7.17.0",
 		"@typescript-eslint/parser": "7.17.0",
 		"cross-env": "7.0.3",
-		"cypress": "13.13.1",
+		"cypress": "13.14.2",
 		"eslint": "9.8.0",
-		"globals": "15.8.0",
+		"globals": "15.9.0",
 		"ncp": "2.0.0",
-		"start-server-and-test": "2.0.4"
+		"start-server-and-test": "2.0.8"
 	},
 	"optionalDependencies": {
 		"@tensorflow/tfjs-core": "4.4.0"
--- a/packages/backend/migration/1726804538569-reactions-buffering.js
+++ b/packages/backend/migration/1726804538569-reactions-buffering.js
@ -0,0 +1,16 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class ReactionsBuffering1726804538569 {
+    name = 'ReactionsBuffering1726804538569'
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" ADD "enableReactionsBuffering" boolean NOT NULL DEFAULT false`);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "enableReactionsBuffering"`);
+    }
+}
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@ -68,26 +68,26 @@
 	"dependencies": {
 		"@aws-sdk/client-s3": "3.620.0",
 		"@aws-sdk/lib-storage": "3.620.0",
-		"@bull-board/api": "5.21.1",
-		"@bull-board/fastify": "5.21.1",
-		"@bull-board/ui": "5.21.1",
-		"@discordapp/twemoji": "15.0.3",
-		"@fastify/accepts": "4.3.0",
-		"@fastify/cookie": "9.3.1",
-		"@fastify/cors": "9.0.1",
-		"@fastify/express": "3.0.0",
-		"@fastify/http-proxy": "9.5.0",
-		"@fastify/multipart": "8.3.0",
-		"@fastify/static": "7.0.4",
-		"@fastify/view": "9.1.0",
+		"@bull-board/api": "5.23.0",
+		"@bull-board/fastify": "5.23.0",
+		"@bull-board/ui": "5.23.0",
+		"@discordapp/twemoji": "15.1.0",
+		"@fastify/accepts": "5.0.0",
+		"@fastify/cookie": "10.0.0",
+		"@fastify/cors": "10.0.0",
+		"@fastify/express": "4.0.0",
+		"@fastify/http-proxy": "10.0.0",
+		"@fastify/multipart": "9.0.0",
+		"@fastify/static": "8.0.0",
+		"@fastify/view": "10.0.0",
 		"@google-cloud/logging": "^10.5.0",
 		"@google-cloud/translate": "^7.2.1",
 		"@misskey-dev/sharp-read-bmp": "1.2.0",
 		"@misskey-dev/summaly": "5.1.0",
-		"@napi-rs/canvas": "^0.1.53",
-		"@nestjs/common": "10.3.10",
-		"@nestjs/core": "10.3.10",
-		"@nestjs/testing": "10.3.10",
+		"@napi-rs/canvas": "0.1.56",
+		"@nestjs/common": "10.4.3",
+		"@nestjs/core": "10.4.3",
+		"@nestjs/testing": "10.4.3",
 		"@peertube/http-signature": "1.7.0",
 		"@sentry/node": "8.20.0",
 		"@sentry/profiling-node": "8.20.0",
@ -105,7 +105,7 @@
 		"bcryptjs": "2.4.3",
 		"blurhash": "2.0.5",
 		"body-parser": "1.20.3",
-		"bullmq": "5.10.4",
+		"bullmq": "5.13.2",
 		"cacheable-lookup": "7.0.0",
 		"cbor": "9.0.2",
 		"chalk": "5.3.0",
@ -118,27 +118,28 @@
 		"content-disposition": "0.5.4",
 		"date-fns": "2.30.0",
 		"deep-email-validator": "0.1.21",
-		"fastify": "4.28.1",
-		"fastify-raw-body": "4.3.0",
+		"fastify": "5.0.0",
+		"fastify-raw-body": "5.0.0",
 		"feed": "4.2.2",
-		"file-type": "19.3.0",
+		"file-type": "19.5.0",
 		"fluent-ffmpeg": "2.1.3",
 		"form-data": "4.0.0",
 		"got": "14.4.2",
-		"happy-dom": "15.6.1",
+		"happy-dom": "15.7.4",
 		"hpagent": "1.2.0",
 		"htmlescape": "1.1.1",
 		"http-link-header": "1.1.3",
 		"ioredis": "5.4.1",
-		"ip-cidr": "4.0.1",
+		"ip-cidr": "4.0.2",
 		"ipaddr.js": "2.2.0",
-		"is-svg": "5.0.1",
+		"is-svg": "5.1.0",
 		"js-yaml": "4.1.0",
 		"jsdom": "24.1.1",
 		"json5": "2.2.3",
 		"jsonld": "8.3.2",
 		"jsrsasign": "11.1.0",
-		"meilisearch": "0.41.0",
+		"meilisearch": "0.42.0",
+		"juice": "11.0.0",
 		"microformats-parser": "2.0.2",
 		"mime-types": "2.1.35",
 		"misskey-reversi": "workspace:*",
@ -146,24 +147,24 @@
 		"nanoid": "5.0.7",
 		"nested-property": "4.0.0",
 		"node-fetch": "3.3.2",
-		"nodemailer": "6.9.14",
+		"nodemailer": "6.9.15",
 		"nsfwjs": "2.4.2",
 		"oauth": "0.10.0",
 		"oauth2orize": "1.12.0",
 		"oauth2orize-pkce": "0.1.2",
 		"os-utils": "0.0.14",
-		"otpauth": "9.3.1",
+		"otpauth": "9.3.2",
 		"parse5": "7.1.2",
-		"pg": "8.12.0",
+		"pg": "8.13.0",
 		"pkce-challenge": "4.1.0",
 		"probe-image-size": "7.2.3",
 		"promise-limit": "2.7.0",
 		"pug": "3.0.3",
 		"punycode": "2.3.1",
-		"qrcode": "1.5.3",
+		"qrcode": "1.5.4",
 		"random-seed": "0.3.0",
 		"ratelimiter": "3.4.1",
-		"re2": "1.21.3",
+		"re2": "1.21.4",
 		"redis-lock": "0.1.4",
 		"reflect-metadata": "0.2.2",
 		"rename": "1.0.4",
@ -171,18 +172,18 @@
 		"rxjs": "7.8.1",
 		"sanitize-html": "2.13.0",
 		"secure-json-parse": "2.7.0",
-		"sharp": "0.33.4",
+		"sharp": "0.33.5",
 		"slacc": "0.0.10",
 		"strict-event-emitter-types": "2.0.0",
 		"stringz": "2.1.0",
 		"strip-ansi": "^7.1.0",
-		"systeminformation": "5.22.11",
+		"systeminformation": "5.23.5",
 		"tinycolor2": "1.6.0",
 		"tmp": "0.2.3",
 		"tsc-alias": "1.8.10",
 		"tsconfig-paths": "4.2.0",
 		"typeorm": "0.3.20",
-		"typescript": "5.5.4",
+		"typescript": "5.6.2",
 		"ulid": "2.3.0",
 		"vary": "1.1.2",
 		"web-push": "3.6.7",
@ -191,7 +192,7 @@
 	},
 	"devDependencies": {
 		"@jest/globals": "29.7.0",
-		"@nestjs/platform-express": "10.3.10",
+		"@nestjs/platform-express": "10.4.3",
 		"@simplewebauthn/types": "10.0.0",
 		"@swc/jest": "0.2.36",
 		"@types/accepts": "1.3.7",
@ -200,10 +201,10 @@
 		"@types/body-parser": "1.19.5",
 		"@types/color-convert": "2.0.3",
 		"@types/content-disposition": "0.5.8",
-		"@types/fluent-ffmpeg": "2.1.24",
+		"@types/fluent-ffmpeg": "2.1.26",
 		"@types/htmlescape": "1.1.3",
 		"@types/http-link-header": "1.0.7",
-		"@types/jest": "29.5.12",
+		"@types/jest": "29.5.13",
 		"@types/js-yaml": "4.0.9",
 		"@types/jsdom": "21.1.7",
 		"@types/jsonld": "1.5.15",
@ -211,18 +212,18 @@
 		"@types/mime-types": "2.1.4",
 		"@types/ms": "0.7.34",
 		"@types/node": "20.14.12",
-		"@types/nodemailer": "6.4.15",
+		"@types/nodemailer": "6.4.16",
 		"@types/oauth": "0.9.5",
 		"@types/oauth2orize": "1.11.5",
 		"@types/oauth2orize-pkce": "0.1.2",
-		"@types/pg": "8.11.6",
+		"@types/pg": "8.11.10",
 		"@types/pug": "2.0.10",
 		"@types/punycode": "2.1.4",
 		"@types/qrcode": "1.5.5",
 		"@types/random-seed": "0.3.5",
 		"@types/ratelimiter": "3.4.6",
 		"@types/rename": "1.0.7",
-		"@types/sanitize-html": "2.11.0",
+		"@types/sanitize-html": "2.13.0",
 		"@types/semver": "7.5.8",
 		"@types/simple-oauth2": "5.0.7",
 		"@types/sinonjs__fake-timers": "8.1.5",
@ -230,17 +231,17 @@
 		"@types/tmp": "0.2.6",
 		"@types/vary": "1.1.3",
 		"@types/web-push": "3.6.3",
-		"@types/ws": "8.5.11",
+		"@types/ws": "8.5.12",
 		"@typescript-eslint/eslint-plugin": "7.17.0",
 		"@typescript-eslint/parser": "7.17.0",
 		"aws-sdk-client-mock": "4.0.1",
 		"cross-env": "7.0.3",
-		"eslint-plugin-import": "2.29.1",
-		"execa": "9.3.0",
+		"eslint-plugin-import": "2.30.0",
+		"execa": "9.4.0",
 		"fkill": "9.0.0",
 		"jest": "29.7.0",
 		"jest-mock": "29.7.0",
-		"nodemon": "3.1.4",
+		"nodemon": "3.1.7",
 		"pid-port": "1.0.0",
 		"simple-oauth2": "5.1.0"
 	}
--- a/packages/backend/src/GlobalModule.ts
+++ b/packages/backend/src/GlobalModule.ts
@ -15,6 +15,8 @@ import { createPostgresDataSource } from './postgres.js';
 import { RepositoryModule } from './models/RepositoryModule.js';
 import { allSettled } from './misc/promise-tracker.js';
 import type { Provider, OnApplicationShutdown } from '@nestjs/common';
+import { MiMeta } from '@/models/Meta.js';
+import { GlobalEvents } from './core/GlobalEventService.js';

 const $config: Provider = {
 	provide: DI.config,
@ -94,6 +96,71 @@ const $redisForTimelines: Provider = {
 	inject: [DI.config],
 };

+const $redisForReactions: Provider = {
+	provide: DI.redisForReactions,
+	useFactory: (config: Config) => {
+		return new Redis.Redis(config.redisForReactions);
+	},
+	inject: [DI.config],
+};
+
+const $meta: Provider = {
+	provide: DI.meta,
+	useFactory: async (db: DataSource, redisForSub: Redis.Redis) => {
+		const meta = await db.transaction(async transactionalEntityManager => {
+			// 過去のバグでレコードが複数出来てしまっている可能性があるので新しいIDを優先する
+			const metas = await transactionalEntityManager.find(MiMeta, {
+				order: {
+					id: 'DESC',
+				},
+			});
+
+			const meta = metas[0];
+
+			if (meta) {
+				return meta;
+			} else {
+				// metaが空のときfetchMetaが同時に呼ばれるとここが同時に呼ばれてしまうことがあるのでフェイルセーフなupsertを使う
+				const saved = await transactionalEntityManager
+					.upsert(
+						MiMeta,
+						{
+							id: 'x',
+						},
+						['id'],
+					)
+					.then((x) => transactionalEntityManager.findOneByOrFail(MiMeta, x.identifiers[0]));
+
+				return saved;
+			}
+		});
+
+		async function onMessage(_: string, data: string): Promise<void> {
+			const obj = JSON.parse(data);
+
+			if (obj.channel === 'internal') {
+				const { type, body } = obj.message as GlobalEvents['internal']['payload'];
+				switch (type) {
+					case 'metaUpdated': {
+						for (const key in body) {
+							(meta as any)[key] = (body as any)[key];
+						}
+						meta.proxyAccount = null; // joinなカラムは通常取ってこないので
+						break;
+					}
+					default:
+						break;
+				}
+			}
+		}
+
+		redisForSub.on('message', onMessage);
+
+		return meta;
+	},
+	inject: [DI.db, DI.redisForSub],
+};
+
 const $redisForJobQueue: Provider = {
 	provide: DI.redisForJobQueue,
 	useFactory: (config: Config) => {
@ -109,8 +176,8 @@ const $redisForJobQueue: Provider = {
@Global()
@Module({
 	imports: [RepositoryModule],
-	providers: [$config, $db, $meilisearch, $cloudLogging, $redis, $redisForPub, $redisForSub, $redisForTimelines, $redisForJobQueue],
-	exports: [$config, $db, $meilisearch, $cloudLogging, $redis, $redisForPub, $redisForSub, $redisForTimelines, $redisForJobQueue, RepositoryModule],
+	providers: [$config, $db, $meta, $meilisearch, $cloudLogging, $redis, $redisForPub, $redisForSub, $redisForTimelines, $redisForReactions, $redisForJobQueue],
+	exports: [$config, $db, $meta, $meilisearch, $cloudLogging, $redis, $redisForPub, $redisForSub, $redisForTimelines, $redisForReactions, $redisForJobQueue, RepositoryModule],
 })
 export class GlobalModule implements OnApplicationShutdown {
 	constructor(
@ -119,6 +186,7 @@ export class GlobalModule implements OnApplicationShutdown {
 		@Inject(DI.redisForPub) private redisForPub: Redis.Redis,
 		@Inject(DI.redisForSub) private redisForSub: Redis.Redis,
 		@Inject(DI.redisForTimelines) private redisForTimelines: Redis.Redis,
+		@Inject(DI.redisForReactions) private redisForReactions: Redis.Redis,
 		@Inject(DI.redisForJobQueue) private redisForJobQueue: Redis.Redis,
 	) { }

@ -132,6 +200,7 @@ export class GlobalModule implements OnApplicationShutdown {
 			this.redisForPub.disconnect(),
 			this.redisForSub.disconnect(),
 			this.redisForTimelines.disconnect(),
+			this.redisForReactions.disconnect(),
 			this.redisForJobQueue.disconnect(),
 		]);
 	}
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@ -49,6 +49,7 @@ type Source = {
 	redisForPubsub?: RedisOptionsSource;
 	redisForJobQueue?: RedisOptionsSource;
 	redisForTimelines?: RedisOptionsSource;
+	redisForReactions?: RedisOptionsSource;
 	meilisearch?: {
 		host: string;
 		port: string;
@ -188,6 +189,7 @@ export type Config = {
 	redisForPubsub: RedisOptions & RedisOptionsSource;
 	redisForJobQueue: RedisOptions & RedisOptionsSource;
 	redisForTimelines: RedisOptions & RedisOptionsSource;
+	redisForReactions: RedisOptions & RedisOptionsSource;
 	sentryForBackend: { options: Partial<Sentry.NodeOptions>; enableNodeProfiling: boolean; } | undefined;
 	sentryForFrontend: { options: Partial<Sentry.NodeOptions> } | undefined;
 	perChannelMaxNoteCacheCount: number;
@ -270,6 +272,7 @@ export function loadConfig(): Config {
 		redisForPubsub: config.redisForPubsub ? convertRedisOptions(config.redisForPubsub, host) : redis,
 		redisForJobQueue: config.redisForJobQueue ? convertRedisOptions(config.redisForJobQueue, host) : redis,
 		redisForTimelines: config.redisForTimelines ? convertRedisOptions(config.redisForTimelines, host) : redis,
+		redisForReactions: config.redisForReactions ? convertRedisOptions(config.redisForReactions, host) : redis,
 		sentryForBackend: config.sentryForBackend,
 		sentryForFrontend: config.sentryForFrontend,
 		id: config.id,
--- a/packages/backend/src/const.ts
+++ b/packages/backend/src/const.ts
@ -8,6 +8,8 @@ export const MAX_NOTE_TEXT_LENGTH = 3000;
 export const USER_ONLINE_THRESHOLD = 1000 * 60 * 10; // 10min
 export const USER_ACTIVE_THRESHOLD = 1000 * 60 * 60 * 24 * 3; // 3days

+export const PER_NOTE_REACTION_USER_PAIR_CACHE_MAX = 16;
+
 //#region hard limits
 // If you change DB_* values, you must also change the DB schema.

--- a/packages/backend/src/core/AbuseReportNotificationService.ts
+++ b/packages/backend/src/core/AbuseReportNotificationService.ts
@ -14,10 +14,10 @@ import type {
 	AbuseReportNotificationRecipientRepository,
 	MiAbuseReportNotificationRecipient,
 	MiAbuseUserReport,
+	MiMeta,
 	MiUser,
 } from '@/models/_.js';
 import { EmailService } from '@/core/EmailService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { RecipientMethod } from '@/models/AbuseReportNotificationRecipient.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
@ -27,15 +27,19 @@ import { IdService } from './IdService.js';
@Injectable()
 export class AbuseReportNotificationService implements OnApplicationShutdown {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.abuseReportNotificationRecipientRepository)
 		private abuseReportNotificationRecipientRepository: AbuseReportNotificationRecipientRepository,
+
 		@Inject(DI.redisForSub)
 		private redisForSub: Redis.Redis,
+
 		private idService: IdService,
 		private roleService: RoleService,
 		private systemWebhookService: SystemWebhookService,
 		private emailService: EmailService,
-		private metaService: MetaService,
 		private moderationLogService: ModerationLogService,
 		private globalEventService: GlobalEventService,
 	) {
@ -93,10 +97,8 @@ export class AbuseReportNotificationService implements OnApplicationShutdown {
 			.filter(x => x != null),
 		);

-		// 送信先の鮮度を保つため、毎回取得する
-		const meta = await this.metaService.fetch(true);
 		recipientEMailAddresses.push(
-			...(meta.email ? [meta.email] : []),
+			...(this.meta.email ? [this.meta.email] : []),
 		);

 		if (recipientEMailAddresses.length <= 0) {
--- a/packages/backend/src/core/AccountMoveService.ts
+++ b/packages/backend/src/core/AccountMoveService.ts
@ -9,7 +9,7 @@ import { IsNull, In, MoreThan, Not } from 'typeorm';
 import { bindThis } from '@/decorators.js';
 import { DI } from '@/di-symbols.js';
 import type { MiLocalUser, MiRemoteUser, MiUser } from '@/models/User.js';
-import type { BlockingsRepository, FollowingsRepository, InstancesRepository, MutingsRepository, UserListMembershipsRepository, UsersRepository } from '@/models/_.js';
+import type { BlockingsRepository, FollowingsRepository, InstancesRepository, MiMeta, MutingsRepository, UserListMembershipsRepository, UsersRepository } from '@/models/_.js';
 import type { RelationshipJobData, ThinUser } from '@/queue/types.js';

 import { IdService } from '@/core/IdService.js';
@ -22,13 +22,15 @@ import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ProxyAccountService } from '@/core/ProxyAccountService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
-import { MetaService } from '@/core/MetaService.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
 import PerUserFollowingChart from '@/core/chart/charts/per-user-following.js';

@Injectable()
 export class AccountMoveService {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -57,7 +59,6 @@ export class AccountMoveService {
 		private perUserFollowingChart: PerUserFollowingChart,
 		private federatedInstanceService: FederatedInstanceService,
 		private instanceChart: InstanceChart,
-		private metaService: MetaService,
 		private relayService: RelayService,
 		private queueService: QueueService,
 	) {
@ -276,7 +277,7 @@ export class AccountMoveService {
 		if (this.userEntityService.isRemoteUser(oldAccount)) {
 			this.federatedInstanceService.fetch(oldAccount.host).then(async i => {
 				this.instancesRepository.decrement({ id: i.id }, 'followersCount', localFollowerIds.length);
-				if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.updateFollowers(i.host, false);
 				}
 			});
--- a/packages/backend/src/core/CoreModule.ts
+++ b/packages/backend/src/core/CoreModule.ts
@ -52,6 +52,7 @@ import { PollService } from './PollService.js';
 import { PushNotificationService } from './PushNotificationService.js';
 import { QueryService } from './QueryService.js';
 import { ReactionService } from './ReactionService.js';
+import { ReactionsBufferingService } from './ReactionsBufferingService.js';
 import { RelayService } from './RelayService.js';
 import { RoleService } from './RoleService.js';
 import { S3Service } from './S3Service.js';
@ -201,6 +202,7 @@ const $ProxyAccountService: Provider = { provide: 'ProxyAccountService', useExis
 const $PushNotificationService: Provider = { provide: 'PushNotificationService', useExisting: PushNotificationService };
 const $QueryService: Provider = { provide: 'QueryService', useExisting: QueryService };
 const $ReactionService: Provider = { provide: 'ReactionService', useExisting: ReactionService };
+const $ReactionsBufferingService: Provider = { provide: 'ReactionsBufferingService', useExisting: ReactionsBufferingService };
 const $RelayService: Provider = { provide: 'RelayService', useExisting: RelayService };
 const $RoleService: Provider = { provide: 'RoleService', useExisting: RoleService };
 const $S3Service: Provider = { provide: 'S3Service', useExisting: S3Service };
@ -356,6 +358,7 @@ const $ApEventService: Provider = { provide: 'ApEventService', useExisting: ApEv
 		PushNotificationService,
 		QueryService,
 		ReactionService,
+		ReactionsBufferingService,
 		RelayService,
 		RoleService,
 		S3Service,
@ -507,6 +510,7 @@ const $ApEventService: Provider = { provide: 'ApEventService', useExisting: ApEv
 		$PushNotificationService,
 		$QueryService,
 		$ReactionService,
+		$ReactionsBufferingService,
 		$RelayService,
 		$RoleService,
 		$S3Service,
@ -659,6 +663,7 @@ const $ApEventService: Provider = { provide: 'ApEventService', useExisting: ApEv
 		PushNotificationService,
 		QueryService,
 		ReactionService,
+		ReactionsBufferingService,
 		RelayService,
 		RoleService,
 		S3Service,
@ -809,6 +814,7 @@ const $ApEventService: Provider = { provide: 'ApEventService', useExisting: ApEv
 		$PushNotificationService,
 		$QueryService,
 		$ReactionService,
+		$ReactionsBufferingService,
 		$RelayService,
 		$RoleService,
 		$S3Service,
--- a/packages/backend/src/core/DriveService.ts
+++ b/packages/backend/src/core/DriveService.ts
@ -11,11 +11,10 @@ import { sharpBmp } from '@misskey-dev/sharp-read-bmp';
 import { IsNull } from 'typeorm';
 import { DeleteObjectCommandInput, PutObjectCommandInput, NoSuchKey } from '@aws-sdk/client-s3';
 import { DI } from '@/di-symbols.js';
-import type { DriveFilesRepository, UsersRepository, DriveFoldersRepository, UserProfilesRepository } from '@/models/_.js';
+import type { DriveFilesRepository, UsersRepository, DriveFoldersRepository, UserProfilesRepository, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import Logger from '@/logger.js';
 import type { MiRemoteUser, MiUser } from '@/models/User.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiDriveFile } from '@/models/DriveFile.js';
 import { IdService } from '@/core/IdService.js';
 import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
@ -99,6 +98,9 @@ export class DriveService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -115,7 +117,6 @@ export class DriveService {
 		private userEntityService: UserEntityService,
 		private driveFileEntityService: DriveFileEntityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private downloadService: DownloadService,
 		private internalStorageService: InternalStorageService,
 		private s3Service: S3Service,
@ -150,9 +151,7 @@ export class DriveService {
 	// thunbnail, webpublic を必要なら生成
 		const alts = await this.generateAlts(path, type, !file.uri);

-		const meta = await this.metaService.fetch();
-
-		if (meta.useObjectStorage) {
+		if (this.meta.useObjectStorage) {
 		//#region ObjectStorage params
 			let [ext] = (name.match(/\.([a-zA-Z0-9_-]+)$/) ?? ['']);

@ -171,13 +170,13 @@ export class DriveService {
 				ext = '';
 			}

-			const useObjectStorageRemote = isRemote && meta.useObjectStorageRemote;
-			const objectStorageBaseUrl = useObjectStorageRemote ? meta.objectStorageRemoteBaseUrl : meta.objectStorageBaseUrl;
-			const objectStorageUseSSL = useObjectStorageRemote ? meta.objectStorageRemoteUseSSL : meta.objectStorageUseSSL;
-			const objectStorageEndpoint = useObjectStorageRemote ? meta.objectStorageRemoteEndpoint : meta.objectStorageEndpoint;
-			const objectStoragePort = useObjectStorageRemote ? meta.objectStorageRemotePort : meta.objectStoragePort;
-			const objectStorageBucket = useObjectStorageRemote ? meta.objectStorageRemoteBucket : meta.objectStorageBucket;
-			const objectStoragePrefix = useObjectStorageRemote ? meta.objectStorageRemotePrefix : meta.objectStoragePrefix;
+			const useObjectStorageRemote = isRemote && this.meta.useObjectStorageRemote;
+			const objectStorageBaseUrl = useObjectStorageRemote ? this.meta.objectStorageRemoteBaseUrl : this.meta.objectStorageBaseUrl;
+			const objectStorageUseSSL = useObjectStorageRemote ? this.meta.objectStorageRemoteUseSSL : this.meta.objectStorageUseSSL;
+			const objectStorageEndpoint = useObjectStorageRemote ? this.meta.objectStorageRemoteEndpoint : this.meta.objectStorageEndpoint;
+			const objectStoragePort = useObjectStorageRemote ? this.meta.objectStorageRemotePort : this.meta.objectStoragePort;
+			const objectStorageBucket = useObjectStorageRemote ? this.meta.objectStorageRemoteBucket : this.meta.objectStorageBucket;
+			const objectStoragePrefix = useObjectStorageRemote ? this.meta.objectStorageRemotePrefix : this.meta.objectStoragePrefix;

 			const baseUrl = objectStorageBaseUrl
 				?? `${ objectStorageUseSSL ? 'https' : 'http' }://${ objectStorageEndpoint }${ objectStoragePort ? `:${objectStoragePort}` : '' }/${ objectStorageBucket }`;
@ -385,11 +384,9 @@ export class DriveService {
 		if (type === 'image/apng') type = 'image/png';
 		if (!FILE_TYPE_BROWSERSAFE.includes(type)) type = 'application/octet-stream';

-		const meta = await this.metaService.fetch();
-
-		const useObjectStorageRemote = isRemote && meta.useObjectStorageRemote;
-		const objectStorageBucket = useObjectStorageRemote ? meta.objectStorageRemoteBucket : meta.objectStorageBucket;
-		const objectStorageSetPublicRead = useObjectStorageRemote ? meta.objectStorageRemoteSetPublicRead : meta.objectStorageSetPublicRead;
+		const useObjectStorageRemote = isRemote && this.meta.useObjectStorageRemote;
+		const objectStorageBucket = useObjectStorageRemote ? this.meta.objectStorageRemoteBucket : this.meta.objectStorageBucket;
+		const objectStorageSetPublicRead = useObjectStorageRemote ? this.meta.objectStorageRemoteSetPublicRead : this.meta.objectStorageSetPublicRead;

 		const params = {
 			Bucket: objectStorageBucket,
@ -407,7 +404,7 @@ export class DriveService {
 		);
 		if (objectStorageSetPublicRead) params.ACL = 'public-read';

-		await this.s3Service.upload(meta, params, isRemote)
+		await this.s3Service.upload(this.meta, params, isRemote)
 			.then(
 				result => {
 					if ('Bucket' in result) { // CompleteMultipartUploadCommandOutput
@ -473,32 +470,31 @@ export class DriveService {
 		ext = null,
 	}: AddFileArgs): Promise<MiDriveFile> {
 		let skipNsfwCheck = false;
-		const instance = await this.metaService.fetch();
 		const userRoleNSFW = user && (await this.roleService.getUserPolicies(user.id)).alwaysMarkNsfw;
 		if (user == null) {
 			skipNsfwCheck = true;
 		} else if (userRoleNSFW) {
 			skipNsfwCheck = true;
 		}
-		if (instance.sensitiveMediaDetection === 'none') skipNsfwCheck = true;
-		if (user && instance.sensitiveMediaDetection === 'local' && this.userEntityService.isRemoteUser(user)) skipNsfwCheck = true;
-		if (user && instance.sensitiveMediaDetection === 'remote' && this.userEntityService.isLocalUser(user)) skipNsfwCheck = true;
+		if (this.meta.sensitiveMediaDetection === 'none') skipNsfwCheck = true;
+		if (user && this.meta.sensitiveMediaDetection === 'local' && this.userEntityService.isRemoteUser(user)) skipNsfwCheck = true;
+		if (user && this.meta.sensitiveMediaDetection === 'remote' && this.userEntityService.isLocalUser(user)) skipNsfwCheck = true;

 		const info = await this.fileInfoService.getFileInfo(path, {
 			skipSensitiveDetection: skipNsfwCheck,
 			sensitiveThreshold: // 感度が高いほどしきい値は低くすることになる
-			instance.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 0.1 :
-			instance.sensitiveMediaDetectionSensitivity === 'high' ? 0.3 :
-			instance.sensitiveMediaDetectionSensitivity === 'low' ? 0.7 :
-			instance.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0.9 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 0.1 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'high' ? 0.3 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'low' ? 0.7 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0.9 :
 			0.5,
 			sensitiveThresholdForPorn: 0.75,
-			enableSensitiveMediaDetectionForVideos: instance.enableSensitiveMediaDetectionForVideos,
+			enableSensitiveMediaDetectionForVideos: this.meta.enableSensitiveMediaDetectionForVideos,
 		});
 		this.registerLogger.info(`${JSON.stringify(info)}`);

 		// 現状 false positive が多すぎて実用に耐えない
-		//if (info.porn && instance.disallowUploadWhenPredictedAsPorn) {
+		//if (info.porn && this.meta.disallowUploadWhenPredictedAsPorn) {
 		//	throw new IdentifiableError('282f77bf-5816-4f72-9264-aa14d8261a21', 'Detected as porn.');
 		//}

@ -598,13 +594,13 @@ export class DriveService {
 		file.maybeSensitive = info.sensitive;
 		file.maybePorn = info.porn;
 		file.isSensitive = user
-			? this.userEntityService.isLocalUser(user) && profile!.alwaysMarkNsfw ? true :
+			? this.userEntityService.isLocalUser(user) && profile?.alwaysMarkNsfw ? true :
 			sensitive ?? false
 			: false;

-		if (user && this.utilityService.isMediaSilencedHost(instance.mediaSilencedHosts, user.host)) file.isSensitive = true;
-		if (info.sensitive && profile!.autoSensitive) file.isSensitive = true;
-		if (info.sensitive && instance.setSensitiveFlagAutomatically) file.isSensitive = true;
+		if (user && this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, user.host)) file.isSensitive = true;
+		if (info.sensitive && profile?.autoSensitive) file.isSensitive = true;
+		if (info.sensitive && this.meta.setSensitiveFlagAutomatically) file.isSensitive = true;
 		if (userRoleNSFW) file.isSensitive = true;

 		if (url !== null) {
@ -666,7 +662,7 @@ export class DriveService {
 			// ローカルユーザーのみ
 			this.perUserDriveChart.update(file, true);
 		} else {
-			if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.updateDrive(file, true);
 			}
 		}
@ -812,7 +808,7 @@ export class DriveService {
 			// ローカルユーザーのみ
 			this.perUserDriveChart.update(file, false);
 		} else {
-			if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.updateDrive(file, false);
 			}
 		}
@ -834,16 +830,15 @@ export class DriveService {

 	@bindThis
 	public async deleteObjectStorageFile(key: string, isRemote: boolean) {
-		const meta = await this.metaService.fetch();
-		const useObjectStorageRemote = isRemote && meta.useObjectStorageRemote;
-		const objectStorageBucket = useObjectStorageRemote ? meta.objectStorageRemoteBucket : meta.objectStorageBucket;
+		const useObjectStorageRemote = isRemote && this.meta.useObjectStorageRemote;
+		const objectStorageBucket = useObjectStorageRemote ? this.meta.objectStorageRemoteBucket : this.meta.objectStorageBucket;
 		try {
 			const param = {
 				Bucket: objectStorageBucket,
 				Key: key,
 			} as DeleteObjectCommandInput;

-			await this.s3Service.delete(meta, param, isRemote);
+			await this.s3Service.delete(this.meta, param, isRemote);
 		} catch (err: any) {
 			if (err.name === 'NoSuchKey') {
 				this.deleteLogger.warn(`The object storage had no such key to delete: ${key}. Skipping this.`, err as Error);
--- a/packages/backend/src/core/EmailService.ts
+++ b/packages/backend/src/core/EmailService.ts
@ -4,18 +4,17 @@
 */

 import * as nodemailer from 'nodemailer';
+import juice from 'juice';
 import { Inject, Injectable } from '@nestjs/common';
 import { validate as validateEmail } from 'deep-email-validator';
-import { MetaService } from '@/core/MetaService.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type Logger from '@/logger.js';
-import type { UserProfilesRepository } from '@/models/_.js';
+import type { MiMeta, UserProfilesRepository } from '@/models/_.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
-import { QueueService } from '@/core/QueueService.js';

@Injectable()
 export class EmailService {
@ -25,49 +24,41 @@ export class EmailService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.userProfilesRepository)
 		private userProfilesRepository: UserProfilesRepository,

-		private metaService: MetaService,
 		private loggerService: LoggerService,
 		private utilityService: UtilityService,
 		private httpRequestService: HttpRequestService,
-		private queueService: QueueService,
 	) {
 		this.logger = this.loggerService.getLogger('email');
 	}

 	@bindThis
 	public async sendEmail(to: string, subject: string, html: string, text: string) {
-		const meta = await this.metaService.fetch(true);
-
-		if (!meta.enableEmail) return;
+		if (!this.meta.enableEmail) return;

 		const iconUrl = `${this.config.url}/static-assets/mi-white.png`;
 		const emailSettingUrl = `${this.config.url}/settings/email`;

-		const enableAuth = meta.smtpUser != null && meta.smtpUser !== '';
+		const enableAuth = this.meta.smtpUser != null && this.meta.smtpUser !== '';

 		const transporter = nodemailer.createTransport({
-			host: meta.smtpHost,
-			port: meta.smtpPort,
-			secure: meta.smtpSecure,
+			host: this.meta.smtpHost,
+			port: this.meta.smtpPort,
+			secure: this.meta.smtpSecure,
 			ignoreTLS: !enableAuth,
 			proxy: this.config.proxySmtp,
 			auth: enableAuth ? {
-				user: meta.smtpUser,
-				pass: meta.smtpPass,
+				user: this.meta.smtpUser,
+				pass: this.meta.smtpPass,
 			} : undefined,
 		} as any);

-		try {
-			// TODO: htmlサニタイズ
-			const info = await transporter.sendMail({
-				from: meta.email!,
-				to: to,
-				subject: subject,
-				text: text,
-				html: `<!doctype html>
+		const htmlContent = `<!doctype html>
 <html>
 	<head>
 		<meta charset="utf-8">
@ -132,7 +123,7 @@ export class EmailService {
 	<body>
 		<main>
 			<header>
-				<img src="${ meta.logoImageUrl ?? meta.iconUrl ?? iconUrl }"/>
+				<img src="${ this.meta.logoImageUrl ?? this.meta.iconUrl ?? iconUrl }"/>
 			</header>
 			<article>
 				<h1>${ subject }</h1>
@ -146,7 +137,18 @@ export class EmailService {
 			<a href="${ this.config.url }">${ this.config.host }</a>
 		</nav>
 	</body>
-</html>`,
+</html>`;
+
+		const inlinedHtml = juice(htmlContent);
+
+		try {
+			// TODO: htmlサニタイズ
+			const info = await transporter.sendMail({
+				from: this.meta.email!,
+				to: to,
+				subject: subject,
+				text: text,
+				html: inlinedHtml,
 			});

 			this.logger.info(`Message sent: ${info.messageId}`);
@ -161,8 +163,6 @@ export class EmailService {
 		available: boolean;
 		reason: null | 'used' | 'format' | 'disposable' | 'mx' | 'smtp' | 'banned' | 'network' | 'blacklist';
 	}> {
-		const meta = await this.metaService.fetch();
-
 		const exist = await this.userProfilesRepository.countBy({
 			emailVerified: true,
 			email: emailAddress,
@ -180,11 +180,11 @@ export class EmailService {
 			reason?: string | null,
 		} = { valid: true, reason: null };

-		if (meta.enableActiveEmailValidation) {
-			if (meta.enableVerifymailApi && meta.verifymailAuthKey != null) {
-				validated = await this.verifyMail(emailAddress, meta.verifymailAuthKey);
-			} else if (meta.enableTruemailApi && meta.truemailInstance && meta.truemailAuthKey != null) {
-				validated = await this.trueMail(meta.truemailInstance, emailAddress, meta.truemailAuthKey);
+		if (this.meta.enableActiveEmailValidation) {
+			if (this.meta.enableVerifymailApi && this.meta.verifymailAuthKey != null) {
+				validated = await this.verifyMail(emailAddress, this.meta.verifymailAuthKey);
+			} else if (this.meta.enableTruemailApi && this.meta.truemailInstance && this.meta.truemailAuthKey != null) {
+				validated = await this.trueMail(this.meta.truemailInstance, emailAddress, this.meta.truemailAuthKey);
 			} else {
 				validated = await validateEmail({
 					email: emailAddress,
@ -214,7 +214,7 @@ export class EmailService {
 		}

 		const emailDomain: string = emailAddress.split('@')[1];
-		const isBanned = this.utilityService.isBlockedHost(meta.bannedEmailDomains, emailDomain);
+		const isBanned = this.utilityService.isBlockedHost(this.meta.bannedEmailDomains, emailDomain);

 		if (isBanned) {
 			return {
--- a/packages/backend/src/core/HashtagService.ts
+++ b/packages/backend/src/core/HashtagService.ts
@ -10,16 +10,18 @@ import type { MiUser } from '@/models/User.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import { IdService } from '@/core/IdService.js';
 import type { MiHashtag } from '@/models/Hashtag.js';
-import type { HashtagsRepository } from '@/models/_.js';
+import type { HashtagsRepository, MiMeta } from '@/models/_.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { UtilityService } from '@/core/UtilityService.js';

@Injectable()
 export class HashtagService {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.redis)
 		private redisClient: Redis.Redis, // TODO: 専用のRedisサーバーを設定できるようにする

@ -29,7 +31,6 @@ export class HashtagService {
 		private userEntityService: UserEntityService,
 		private featuredService: FeaturedService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private utilityService: UtilityService,
 	) {
 	}
@ -160,10 +161,9 @@ export class HashtagService {

 	@bindThis
 	public async updateHashtagsRanking(hashtag: string, userId: MiUser['id']): Promise<void> {
-		const instance = await this.metaService.fetch();
-		const hiddenTags = instance.hiddenTags.map(t => normalizeForSearch(t));
+		const hiddenTags = this.meta.hiddenTags.map(t => normalizeForSearch(t));
 		if (hiddenTags.includes(hashtag)) return;
-		if (this.utilityService.isKeyWordIncluded(hashtag, instance.sensitiveWords)) return;
+		if (this.utilityService.isKeyWordIncluded(hashtag, this.meta.sensitiveWords)) return;

 		// YYYYMMDDHHmm (10分間隔)
 		const now = new Date();
--- a/packages/backend/src/core/MfmService.ts
+++ b/packages/backend/src/core/MfmService.ts
@ -239,7 +239,7 @@ export class MfmService {
 			return null;
 		}

-		const { window } = new Window();
+		const { happyDOM, window } = new Window();

 		const doc = window.document;

@ -457,6 +457,10 @@ export class MfmService {

 		appendChildren(nodes, body);

-		return new XMLSerializer().serializeToString(body);
+		const serialized = new XMLSerializer().serializeToString(body);
+
+		happyDOM.close().catch(err => {});
+
+		return serialized;
 	}
 }
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@ -8,7 +8,6 @@ import * as mfm from 'cherrypick-mfm-js';
 import { In, DataSource, IsNull, LessThan } from 'typeorm';
 import * as Redis from 'ioredis';
 import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
-import RE2 from 're2';
 import { extractMentions } from '@/misc/extract-mentions.js';
 import { extractCustomEmojisFromMfm } from '@/misc/extract-custom-emojis-from-mfm.js';
 import { extractHashtags } from '@/misc/extract-hashtags.js';
@ -16,7 +15,7 @@ import type { IMentionedRemoteUsers } from '@/models/Note.js';
 import { MiNote } from '@/models/Note.js';
 import { MiEvent } from '@/models/Event.js';
 import type { IEvent } from '@/models/Event.js';
-import type { ChannelFollowingsRepository, ChannelsRepository, FollowingsRepository, InstancesRepository, MiFollowing, MutingsRepository, NotesRepository, NoteThreadMutingsRepository, UserListMembershipsRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type { ChannelFollowingsRepository, ChannelsRepository, FollowingsRepository, InstancesRepository, MiFollowing, MiMeta, MutingsRepository, NotesRepository, NoteThreadMutingsRepository, UserListMembershipsRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import type { MiApp } from '@/models/App.js';
 import { concat } from '@/misc/prelude/array.js';
@ -25,11 +24,8 @@ import type { MiUser, MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import type { IPoll } from '@/models/Poll.js';
 import { MiPoll } from '@/models/Poll.js';
 import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
-import { checkWordMute } from '@/misc/check-word-mute.js';
 import type { MiChannel } from '@/models/Channel.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
-import { MemorySingleCache } from '@/misc/cache.js';
-import type { MiUserProfile } from '@/models/UserProfile.js';
 import { RelayService } from '@/core/RelayService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { DI } from '@/di-symbols.js';
@ -53,7 +49,6 @@ import { RemoteUserResolveService } from '@/core/RemoteUserResolveService.js';
 import { bindThis } from '@/decorators.js';
 import { DB_MAX_NOTE_TEXT_LENGTH } from '@/const.js';
 import { RoleService } from '@/core/RoleService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { SearchService } from '@/core/SearchService.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
 import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
@ -161,6 +156,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.db)
 		private db: DataSource,

@ -215,7 +213,6 @@ export class NoteCreateService implements OnApplicationShutdown {
 		private apDeliverManagerService: ApDeliverManagerService,
 		private apRendererService: ApRendererService,
 		private roleService: RoleService,
-		private metaService: MetaService,
 		private searchService: SearchService,
 		private notesChart: NotesChart,
 		private perUserNotesChart: PerUserNotesChart,
@ -257,10 +254,8 @@ export class NoteCreateService implements OnApplicationShutdown {
 		if (data.channel != null) data.visibleUsers = [];
 		if (data.channel != null) data.localOnly = true;

-		const meta = await this.metaService.fetch();
-
 		if (data.visibility === 'public' && data.channel == null) {
-			const sensitiveWords = meta.sensitiveWords;
+			const sensitiveWords = this.meta.sensitiveWords;
 			if (this.utilityService.isKeyWordIncluded(data.cw ?? data.text ?? '', sensitiveWords)) {
 				data.visibility = 'home';
 			} else if ((await this.roleService.getUserPolicies(user.id)).canPublicNote === false) {
@ -268,17 +263,17 @@ export class NoteCreateService implements OnApplicationShutdown {
 			}
 		}

-		const hasProhibitedWords = await this.checkProhibitedWordsContain({
+		const hasProhibitedWords = this.checkProhibitedWordsContain({
 			cw: data.cw,
 			text: data.text,
 			pollChoices: data.poll?.choices,
-		}, meta.prohibitedWords);
+		}, this.meta.prohibitedWords);

 		if (hasProhibitedWords) {
 			throw new IdentifiableError('689ee33f-f97c-479a-ac49-1b9f8140af99', 'Note contains prohibited words');
 		}

-		const inSilencedInstance = this.utilityService.isSilencedHost(meta.silencedHosts, user.host);
+		const inSilencedInstance = this.utilityService.isSilencedHost(this.meta.silencedHosts, user.host);

 		if (data.visibility === 'public' && inSilencedInstance && user.host !== null) {
 			data.visibility = 'home';
@ -371,7 +366,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}

 		// if the host is media-silenced, custom emojis are not allowed
-		if (this.utilityService.isMediaSilencedHost(meta.mediaSilencedHosts, user.host)) emojis = [];
+		if (this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, user.host)) emojis = [];

 		tags = tags.filter(tag => Array.from(tag).length <= 128).splice(0, 32);

@ -531,10 +526,8 @@ export class NoteCreateService implements OnApplicationShutdown {
 		host: MiUser['host'];
 		isBot: MiUser['isBot'];
 	}, data: Option, silent: boolean, tags: string[], mentionedUsers: MinimumUser[]) {
-		const meta = await this.metaService.fetch();
-
 		this.notesChart.update(note, true);
-		if (note.visibility !== 'specified' && (meta.enableChartsForRemoteUser || (user.host == null))) {
+		if (note.visibility !== 'specified' && (this.meta.enableChartsForRemoteUser || (user.host == null))) {
 			this.perUserNotesChart.update(user, note, true);
 		}

@ -542,7 +535,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		if (this.userEntityService.isRemoteUser(user)) {
 			this.federatedInstanceService.fetch(user.host).then(async i => {
 				this.instancesRepository.increment({ id: i.id }, 'notesCount', 1);
-				if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.updateNote(i.host, note, true);
 				}
 			});
@ -878,15 +871,14 @@ export class NoteCreateService implements OnApplicationShutdown {

 	@bindThis
 	private async pushToTl(note: MiNote, user: { id: MiUser['id']; host: MiUser['host']; }) {
-		const meta = await this.metaService.fetch();
-		if (!meta.enableFanoutTimeline) return;
+		if (!this.meta.enableFanoutTimeline) return;

 		const r = this.redisForTimelines.pipeline();

 		if (note.channelId) {
 			this.fanoutTimelineService.push(`channelTimeline:${note.channelId}`, note.id, this.config.perChannelMaxNoteCacheCount, r);

-			this.fanoutTimelineService.push(`userTimelineWithChannel:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
+			this.fanoutTimelineService.push(`userTimelineWithChannel:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax : this.meta.perRemoteUserUserTimelineCacheMax, r);

 			const channelFollowings = await this.channelFollowingsRepository.find({
 				where: {
@ -896,9 +888,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 			});

 			for (const channelFollowing of channelFollowings) {
-				this.fanoutTimelineService.push(`homeTimeline:${channelFollowing.followerId}`, note.id, meta.perUserHomeTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`homeTimeline:${channelFollowing.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`homeTimelineWithFiles:${channelFollowing.followerId}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`homeTimelineWithFiles:${channelFollowing.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax / 2, r);
 				}
 			}
 		} else {
@ -936,9 +928,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 					if (!following.withReplies) continue;
 				}

-				this.fanoutTimelineService.push(`homeTimeline:${following.followerId}`, note.id, meta.perUserHomeTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`homeTimeline:${following.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`homeTimelineWithFiles:${following.followerId}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`homeTimelineWithFiles:${following.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax / 2, r);
 				}
 			}

@ -955,25 +947,25 @@ export class NoteCreateService implements OnApplicationShutdown {
 					if (!userListMembership.withReplies) continue;
 				}

-				this.fanoutTimelineService.push(`userListTimeline:${userListMembership.userListId}`, note.id, meta.perUserListTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`userListTimeline:${userListMembership.userListId}`, note.id, this.meta.perUserListTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`userListTimelineWithFiles:${userListMembership.userListId}`, note.id, meta.perUserListTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`userListTimelineWithFiles:${userListMembership.userListId}`, note.id, this.meta.perUserListTimelineCacheMax / 2, r);
 				}
 			}

 			// 自分自身のHTL
 			if (note.userHost == null) {
 				if (note.visibility !== 'specified' || !note.visibleUserIds.some(v => v === user.id)) {
-					this.fanoutTimelineService.push(`homeTimeline:${user.id}`, note.id, meta.perUserHomeTimelineCacheMax, r);
+					this.fanoutTimelineService.push(`homeTimeline:${user.id}`, note.id, this.meta.perUserHomeTimelineCacheMax, r);
 					if (note.fileIds.length > 0) {
-						this.fanoutTimelineService.push(`homeTimelineWithFiles:${user.id}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
+						this.fanoutTimelineService.push(`homeTimelineWithFiles:${user.id}`, note.id, this.meta.perUserHomeTimelineCacheMax / 2, r);
 					}
 				}
 			}

 			// 自分自身以外への返信
 			if (isReply(note)) {
-				this.fanoutTimelineService.push(`userTimelineWithReplies:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`userTimelineWithReplies:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax : this.meta.perRemoteUserUserTimelineCacheMax, r);

 				if (note.visibility === 'public' && note.userHost == null) {
 					this.fanoutTimelineService.push('localTimelineWithReplies', note.id, 300, r);
@ -982,9 +974,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 					}
 				}
 			} else {
-				this.fanoutTimelineService.push(`userTimeline:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`userTimeline:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax : this.meta.perRemoteUserUserTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`userTimelineWithFiles:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax / 2 : meta.perRemoteUserUserTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`userTimelineWithFiles:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax / 2 : this.meta.perRemoteUserUserTimelineCacheMax / 2, r);
 				}

 				if (note.visibility === 'public' && note.userHost == null) {
@ -1043,9 +1035,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 	}

-	public async checkProhibitedWordsContain(content: Parameters<UtilityService['concatNoteContentsForKeyWordCheck']>[0], prohibitedWords?: string[]) {
+	public checkProhibitedWordsContain(content: Parameters<UtilityService['concatNoteContentsForKeyWordCheck']>[0], prohibitedWords?: string[]) {
 		if (prohibitedWords == null) {
-			prohibitedWords = (await this.metaService.fetch()).prohibitedWords;
+			prohibitedWords = this.meta.prohibitedWords;
 		}

 		if (
--- a/packages/backend/src/core/NoteDeleteService.ts
+++ b/packages/backend/src/core/NoteDeleteService.ts
@ -7,7 +7,7 @@ import { Brackets, In } from 'typeorm';
 import { Injectable, Inject } from '@nestjs/common';
 import type { MiUser, MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import type { MiNote, IMentionedRemoteUsers } from '@/models/Note.js';
-import type { InstancesRepository, NotesRepository, UsersRepository } from '@/models/_.js';
+import type { InstancesRepository, MiMeta, NotesRepository, UsersRepository } from '@/models/_.js';
 import { RelayService } from '@/core/RelayService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { DI } from '@/di-symbols.js';
@ -19,9 +19,7 @@ import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
-import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { SearchService } from '@/core/SearchService.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
 import { isQuote, isRenote } from '@/misc/is-renote.js';
@ -32,6 +30,9 @@ export class NoteDeleteService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -42,13 +43,11 @@ export class NoteDeleteService {
 		private instancesRepository: InstancesRepository,

 		private userEntityService: UserEntityService,
-		private noteEntityService: NoteEntityService,
 		private globalEventService: GlobalEventService,
 		private relayService: RelayService,
 		private federatedInstanceService: FederatedInstanceService,
 		private apRendererService: ApRendererService,
 		private apDeliverManagerService: ApDeliverManagerService,
-		private metaService: MetaService,
 		private searchService: SearchService,
 		private moderationLogService: ModerationLogService,
 		private notesChart: NotesChart,
@ -104,17 +103,15 @@ export class NoteDeleteService {
 			 */
 			//#endregion

-			const meta = await this.metaService.fetch();
-
 			this.notesChart.update(note, false);
-			if (meta.enableChartsForRemoteUser || (user.host == null)) {
+			if (this.meta.enableChartsForRemoteUser || (user.host == null)) {
 				this.perUserNotesChart.update(user, note, false);
 			}

 			if (this.userEntityService.isRemoteUser(user)) {
 				this.federatedInstanceService.fetch(user.host).then(async i => {
 					this.instancesRepository.decrement({ id: i.id }, 'notesCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateNote(i.host, note, false);
 					}
 				});
--- a/packages/backend/src/core/ProxyAccountService.ts
+++ b/packages/backend/src/core/ProxyAccountService.ts
@ -4,26 +4,25 @@
 */

 import { Inject, Injectable } from '@nestjs/common';
-import type { UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsersRepository } from '@/models/_.js';
 import type { MiLocalUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';

@Injectable()
 export class ProxyAccountService {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
-
-		private metaService: MetaService,
 	) {
 	}

 	@bindThis
 	public async fetch(): Promise<MiLocalUser | null> {
-		const meta = await this.metaService.fetch();
-		if (meta.proxyAccountId == null) return null;
-		return await this.usersRepository.findOneByOrFail({ id: meta.proxyAccountId }) as MiLocalUser;
+		if (this.meta.proxyAccountId == null) return null;
+		return await this.usersRepository.findOneByOrFail({ id: this.meta.proxyAccountId }) as MiLocalUser;
 	}
 }
--- a/packages/backend/src/core/PushNotificationService.ts
+++ b/packages/backend/src/core/PushNotificationService.ts
@ -10,8 +10,7 @@ import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type { Packed } from '@/misc/json-schema.js';
 import { getNoteSummary } from '@/misc/get-note-summary.js';
-import type { MiSwSubscription, SwSubscriptionsRepository } from '@/models/_.js';
-import { MetaService } from '@/core/MetaService.js';
+import type { MiMeta, MiSwSubscription, SwSubscriptionsRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import { RedisKVCache } from '@/misc/cache.js';

@ -57,13 +56,14 @@ export class PushNotificationService implements OnApplicationShutdown {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.redis)
 		private redisClient: Redis.Redis,

 		@Inject(DI.swSubscriptionsRepository)
 		private swSubscriptionsRepository: SwSubscriptionsRepository,
-
-		private metaService: MetaService,
 	) {
 		this.subscriptionsCache = new RedisKVCache<MiSwSubscription[]>(this.redisClient, 'userSwSubscriptions', {
 			lifetime: 1000 * 60 * 60 * 1, // 1h
@ -76,14 +76,12 @@ export class PushNotificationService implements OnApplicationShutdown {

 	@bindThis
 	public async pushNotification<T extends keyof PushNotificationsTypes>(userId: string, type: T, body: PushNotificationsTypes[T]) {
-		const meta = await this.metaService.fetch();
-
-		if (!meta.enableServiceWorker || meta.swPublicKey == null || meta.swPrivateKey == null) return;
+		if (!this.meta.enableServiceWorker || this.meta.swPublicKey == null || this.meta.swPrivateKey == null) return;

 		// アプリケーションの連絡先と、サーバーサイドの鍵ペアの情報を登録
 		push.setVapidDetails(this.config.url,
-			meta.swPublicKey,
-			meta.swPrivateKey);
+			this.meta.swPublicKey,
+			this.meta.swPrivateKey);

 		const subscriptions = await this.subscriptionsCache.fetch(userId);

--- a/packages/backend/src/core/QueueService.ts
+++ b/packages/backend/src/core/QueueService.ts
@ -88,6 +88,12 @@ export class QueueService {
 			repeat: { pattern: '*/5 * * * *' },
 			removeOnComplete: true,
 		});
+
+		this.systemQueue.add('bakeBufferedReactions', {
+		}, {
+			repeat: { pattern: '0 0 * * *' },
+			removeOnComplete: true,
+		});
 	}

 	@bindThis
--- a/packages/backend/src/core/ReactionService.ts
+++ b/packages/backend/src/core/ReactionService.ts
@ -4,9 +4,8 @@
 */

 import { Inject, Injectable } from '@nestjs/common';
-import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
-import type { EmojisRepository, NoteReactionsRepository, UsersRepository, NotesRepository } from '@/models/_.js';
+import type { EmojisRepository, NoteReactionsRepository, UsersRepository, NotesRepository, MiMeta } from '@/models/_.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import type { MiRemoteUser, MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
@ -21,7 +20,6 @@ import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerServ
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
@ -30,9 +28,10 @@ import { RoleService } from '@/core/RoleService.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
 import { trackPromise } from '@/misc/promise-tracker.js';
 import { isQuote, isRenote } from '@/misc/is-renote.js';
+import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
+import { PER_NOTE_REACTION_USER_PAIR_CACHE_MAX } from '@/const.js';

 const FALLBACK = '\u2764';
-const PER_NOTE_REACTION_USER_PAIR_CACHE_MAX = 16;

 const legacies: Record<string, string> = {
 	'like': '👍',
@ -71,8 +70,8 @@ const decodeCustomEmojiRegexp = /^:([\w+-]+)(?:@([\w.-]+))?:$/;
@Injectable()
 export class ReactionService {
 	constructor(
-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
+		@Inject(DI.meta)
+		private meta: MiMeta,

 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
@ -87,12 +86,12 @@ export class ReactionService {
 		private emojisRepository: EmojisRepository,

 		private utilityService: UtilityService,
-		private metaService: MetaService,
 		private customEmojiService: CustomEmojiService,
 		private roleService: RoleService,
 		private userEntityService: UserEntityService,
 		private noteEntityService: NoteEntityService,
 		private userBlockingService: UserBlockingService,
+		private reactionsBufferingService: ReactionsBufferingService,
 		private idService: IdService,
 		private featuredService: FeaturedService,
 		private globalEventService: GlobalEventService,
@ -105,8 +104,6 @@ export class ReactionService {

 	@bindThis
 	public async create(user: { id: MiUser['id']; host: MiUser['host']; isBot: MiUser['isBot'] }, note: MiNote, _reaction?: string | null) {
-		const meta = await this.metaService.fetch();
-
 		// Check blocking
 		if (note.userId !== user.id) {
 			const blocked = await this.userBlockingService.checkBlocked(note.userId, user.id);
@ -152,7 +149,7 @@ export class ReactionService {
 						}

 						// for media silenced host, custom emoji reactions are not allowed
-						if (reacterHost != null && this.utilityService.isMediaSilencedHost(meta.mediaSilencedHosts, reacterHost)) {
+						if (reacterHost != null && this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, reacterHost)) {
 							reaction = FALLBACK;
 						}
 					} else {
@ -174,7 +171,6 @@ export class ReactionService {
 			reaction,
 		};

-		// Create reaction
 		try {
 			await this.noteReactionsRepository.insert(record);
 		} catch (e) {
@ -198,6 +194,9 @@ export class ReactionService {
 		}

 		// Increment reactions count
+		if (this.meta.enableReactionsBuffering) {
+			await this.reactionsBufferingService.create(note.id, user.id, reaction, note.reactionAndUserPairCache);
+		} else {
 			const sql = `jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + 1)::text::jsonb)`;
 			await this.notesRepository.createQueryBuilder().update()
 				.set({
@ -208,6 +207,7 @@ export class ReactionService {
 				})
 				.where('id = :id', { id: note.id })
 				.execute();
+		}

 		// 30%の確率、セルフではない、3日以内に投稿されたノートの場合ハイライト用ランキング更新
 		if (
@ -227,7 +227,7 @@ export class ReactionService {
 			}
 		}

-		if (meta.enableChartsForRemoteUser || (user.host == null)) {
+		if (this.meta.enableChartsForRemoteUser || (user.host == null)) {
 			this.perUserReactionsChart.update(user, note);
 		}

@ -305,6 +305,9 @@ export class ReactionService {
 		}

 		// Decrement reactions count
+		if (this.meta.enableReactionsBuffering) {
+			await this.reactionsBufferingService.delete(note.id, user.id, exist.reaction);
+		} else {
 			const sql = `jsonb_set("reactions", '{${exist.reaction}}', (COALESCE("reactions"->>'${exist.reaction}', '0')::int - 1)::text::jsonb)`;
 			await this.notesRepository.createQueryBuilder().update()
 				.set({
@ -313,6 +316,7 @@ export class ReactionService {
 				})
 				.where('id = :id', { id: note.id })
 				.execute();
+		}

 		this.globalEventService.publishNoteStream(note.id, 'unreacted', {
 			reaction: this.decodeReaction(exist.reaction).reaction,
@ -333,6 +337,7 @@ export class ReactionService {
 		//#endregion
 	}

+	// TODO: 廃止
 	/**
 	 * 文字列タイプのレガシーな形式のリアクションを現在の形式に変換しつつ、
 	 * データベース上には存在する「0個のリアクションがついている」という情報を削除する。
--- a/packages/backend/src/core/ReactionsBufferingService.ts
+++ b/packages/backend/src/core/ReactionsBufferingService.ts
@ -0,0 +1,162 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import * as Redis from 'ioredis';
+import { DI } from '@/di-symbols.js';
+import type { MiNote } from '@/models/Note.js';
+import { bindThis } from '@/decorators.js';
+import type { MiUser, NotesRepository } from '@/models/_.js';
+import type { Config } from '@/config.js';
+import { PER_NOTE_REACTION_USER_PAIR_CACHE_MAX } from '@/const.js';
+
+const REDIS_DELTA_PREFIX = 'reactionsBufferDeltas';
+const REDIS_PAIR_PREFIX = 'reactionsBufferPairs';
+
+@Injectable()
+export class ReactionsBufferingService {
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+
+		@Inject(DI.redisForReactions)
+		private redisForReactions: Redis.Redis, // TODO: 専用のRedisインスタンスにする
+
+		@Inject(DI.notesRepository)
+		private notesRepository: NotesRepository,
+	) {
+	}
+
+	@bindThis
+	public async create(noteId: MiNote['id'], userId: MiUser['id'], reaction: string, currentPairs: string[]): Promise<void> {
+		const pipeline = this.redisForReactions.pipeline();
+		pipeline.hincrby(`${REDIS_DELTA_PREFIX}:${noteId}`, reaction, 1);
+		for (let i = 0; i < currentPairs.length; i++) {
+			pipeline.zadd(`${REDIS_PAIR_PREFIX}:${noteId}`, i, currentPairs[i]);
+		}
+		pipeline.zadd(`${REDIS_PAIR_PREFIX}:${noteId}`, Date.now(), `${userId}/${reaction}`);
+		pipeline.zremrangebyrank(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -(PER_NOTE_REACTION_USER_PAIR_CACHE_MAX + 1));
+		await pipeline.exec();
+	}
+
+	@bindThis
+	public async delete(noteId: MiNote['id'], userId: MiUser['id'], reaction: string): Promise<void> {
+		const pipeline = this.redisForReactions.pipeline();
+		pipeline.hincrby(`${REDIS_DELTA_PREFIX}:${noteId}`, reaction, -1);
+		pipeline.zrem(`${REDIS_PAIR_PREFIX}:${noteId}`, `${userId}/${reaction}`);
+		// TODO: 「消した要素一覧」も持っておかないとcreateされた時に上書きされて復活する
+		await pipeline.exec();
+	}
+
+	@bindThis
+	public async get(noteId: MiNote['id']): Promise<{
+		deltas: Record<string, number>;
+		pairs: ([MiUser['id'], string])[];
+	}> {
+		const pipeline = this.redisForReactions.pipeline();
+		pipeline.hgetall(`${REDIS_DELTA_PREFIX}:${noteId}`);
+		pipeline.zrange(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -1);
+		const results = await pipeline.exec();
+
+		const resultDeltas = results![0][1] as Record<string, string>;
+		const resultPairs = results![1][1] as string[];
+
+		const deltas = {} as Record<string, number>;
+		for (const [name, count] of Object.entries(resultDeltas)) {
+			deltas[name] = parseInt(count);
+		}
+
+		const pairs = resultPairs.map(x => x.split('/') as [MiUser['id'], string]);
+
+		return {
+			deltas,
+			pairs,
+		};
+	}
+
+	@bindThis
+	public async getMany(noteIds: MiNote['id'][]): Promise<Map<MiNote['id'], {
+		deltas: Record<string, number>;
+		pairs: ([MiUser['id'], string])[];
+	}>> {
+		const map = new Map<MiNote['id'], {
+			deltas: Record<string, number>;
+			pairs: ([MiUser['id'], string])[];
+		}>();
+
+		const pipeline = this.redisForReactions.pipeline();
+		for (const noteId of noteIds) {
+			pipeline.hgetall(`${REDIS_DELTA_PREFIX}:${noteId}`);
+			pipeline.zrange(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -1);
+		}
+		const results = await pipeline.exec();
+
+		const opsForEachNotes = 2;
+		for (let i = 0; i < noteIds.length; i++) {
+			const noteId = noteIds[i];
+			const resultDeltas = results![i * opsForEachNotes][1] as Record<string, string>;
+			const resultPairs = results![i * opsForEachNotes + 1][1] as string[];
+
+			const deltas = {} as Record<string, number>;
+			for (const [name, count] of Object.entries(resultDeltas)) {
+				deltas[name] = parseInt(count);
+			}
+
+			const pairs = resultPairs.map(x => x.split('/') as [MiUser['id'], string]);
+
+			map.set(noteId, {
+				deltas,
+				pairs,
+			});
+		}
+
+		return map;
+	}
+
+	// TODO: scanは重い可能性があるので、別途 bufferedNoteIds を直接Redis上に持っておいてもいいかもしれない
+	@bindThis
+	public async bake(): Promise<void> {
+		const bufferedNoteIds = [];
+		let cursor = '0';
+		do {
+			// https://github.com/redis/ioredis#transparent-key-prefixing
+			const result = await this.redisForReactions.scan(
+				cursor,
+				'MATCH',
+				`${this.config.redis.prefix}:${REDIS_DELTA_PREFIX}:*`,
+				'COUNT',
+				'1000');
+
+			cursor = result[0];
+			bufferedNoteIds.push(...result[1].map(x => x.replace(`${this.config.redis.prefix}:${REDIS_DELTA_PREFIX}:`, '')));
+		} while (cursor !== '0');
+
+		const bufferedMap = await this.getMany(bufferedNoteIds);
+
+		// clear
+		const pipeline = this.redisForReactions.pipeline();
+		for (const noteId of bufferedNoteIds) {
+			pipeline.del(`${REDIS_DELTA_PREFIX}:${noteId}`);
+			pipeline.del(`${REDIS_PAIR_PREFIX}:${noteId}`);
+		}
+		await pipeline.exec();
+
+		// TODO: SQL一個にまとめたい
+		for (const [noteId, buffered] of bufferedMap) {
+			const sql = Object.entries(buffered.deltas)
+				.map(([reaction, count]) =>
+					`jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + ${count})::text::jsonb)`)
+				.join(' || ');
+
+			this.notesRepository.createQueryBuilder().update()
+				.set({
+					reactions: () => sql,
+					reactionAndUserPairCache: buffered.pairs.map(x => x.join('/')),
+				})
+				.where('id = :id', { id: noteId })
+				.execute();
+		}
+	}
+}
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@ -8,6 +8,7 @@ import * as Redis from 'ioredis';
 import { In } from 'typeorm';
 import { ModuleRef } from '@nestjs/core';
 import type {
+	MiMeta,
 	MiRole,
 	MiRoleAssignment,
 	RoleAssignmentsRepository,
@ -18,7 +19,6 @@ import { MemoryKVCache, MemorySingleCache } from '@/misc/cache.js';
 import type { MiUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { CacheService } from '@/core/CacheService.js';
 import type { RoleCondFormulaValue } from '@/models/Role.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
@ -59,6 +59,11 @@ export type RolePolicies = {
 	userEachUserListsLimit: number;
 	rateLimitFactor: number;
 	avatarDecorationLimit: number;
+	canImportAntennas: boolean;
+	canImportBlocking: boolean;
+	canImportFollowing: boolean;
+	canImportMuting: boolean;
+	canImportUserLists: boolean;
 };

 export const DEFAULT_POLICIES: RolePolicies = {
@ -89,6 +94,11 @@ export const DEFAULT_POLICIES: RolePolicies = {
 	userEachUserListsLimit: 50,
 	rateLimitFactor: 1,
 	avatarDecorationLimit: 1,
+	canImportAntennas: true,
+	canImportBlocking: true,
+	canImportFollowing: true,
+	canImportMuting: true,
+	canImportUserLists: true,
 };

@Injectable()
@ -103,8 +113,8 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 	constructor(
 		private moduleRef: ModuleRef,

-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
+		@Inject(DI.meta)
+		private meta: MiMeta,

 		@Inject(DI.redisForTimelines)
 		private redisForTimelines: Redis.Redis,
@ -121,7 +131,6 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 		@Inject(DI.roleAssignmentsRepository)
 		private roleAssignmentsRepository: RoleAssignmentsRepository,

-		private metaService: MetaService,
 		private cacheService: CacheService,
 		private userEntityService: UserEntityService,
 		private globalEventService: GlobalEventService,
@ -343,8 +352,7 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {

 	@bindThis
 	public async getUserPolicies(userId: MiUser['id'] | null): Promise<RolePolicies> {
-		const meta = await this.metaService.fetch();
-		const basePolicies = { ...DEFAULT_POLICIES, ...meta.policies };
+		const basePolicies = { ...DEFAULT_POLICIES, ...this.meta.policies };

 		if (userId == null) return basePolicies;

@ -392,6 +400,11 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 			userEachUserListsLimit: calc('userEachUserListsLimit', vs => Math.max(...vs)),
 			rateLimitFactor: calc('rateLimitFactor', vs => Math.max(...vs)),
 			avatarDecorationLimit: calc('avatarDecorationLimit', vs => Math.max(...vs)),
+			canImportAntennas: calc('canImportAntennas', vs => vs.some(v => v === true)),
+			canImportBlocking: calc('canImportBlocking', vs => vs.some(v => v === true)),
+			canImportFollowing: calc('canImportFollowing', vs => vs.some(v => v === true)),
+			canImportMuting: calc('canImportMuting', vs => vs.some(v => v === true)),
+			canImportUserLists: calc('canImportUserLists', vs => vs.some(v => v === true)),
 		};
 	}

--- a/packages/backend/src/core/SignupService.ts
+++ b/packages/backend/src/core/SignupService.ts
@ -8,7 +8,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import bcrypt from 'bcryptjs';
 import { DataSource, IsNull } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
 import { MiUser } from '@/models/User.js';
 import { MiUserProfile } from '@/models/UserProfile.js';
 import { IdService } from '@/core/IdService.js';
@ -20,7 +20,6 @@ import { InstanceActorService } from '@/core/InstanceActorService.js';
 import { bindThis } from '@/decorators.js';
 import UsersChart from '@/core/chart/charts/users.js';
 import { UtilityService } from '@/core/UtilityService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { UserService } from '@/core/UserService.js';

@Injectable()
@ -29,6 +28,9 @@ export class SignupService {
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -39,7 +41,6 @@ export class SignupService {
 		private userService: UserService,
 		private userEntityService: UserEntityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private instanceActorService: InstanceActorService,
 		private usersChart: UsersChart,
 	) {
@ -88,8 +89,7 @@ export class SignupService {
 		const isTheFirstUser = !await this.instanceActorService.realLocalUsersPresent();

 		if (!opts.ignorePreservedUsernames && !isTheFirstUser) {
-			const instance = await this.metaService.fetch(true);
-			const isPreserved = instance.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
+			const isPreserved = this.meta.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
 			if (isPreserved) {
 				throw new Error('USED_USERNAME');
 			}
--- a/packages/backend/src/core/UserFollowingService.ts
+++ b/packages/backend/src/core/UserFollowingService.ts
@ -13,23 +13,20 @@ import PerUserFollowingChart from '@/core/chart/charts/per-user-following.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { IdService } from '@/core/IdService.js';
 import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
-import type { Packed } from '@/misc/json-schema.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { UserWebhookService } from '@/core/UserWebhookService.js';
 import { NotificationService } from '@/core/NotificationService.js';
 import { DI } from '@/di-symbols.js';
-import type { FollowingsRepository, FollowRequestsRepository, InstancesRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type { FollowingsRepository, FollowRequestsRepository, InstancesRepository, MiMeta, UserProfilesRepository, UsersRepository } from '@/models/_.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { bindThis } from '@/decorators.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { CacheService } from '@/core/CacheService.js';
 import type { Config } from '@/config.js';
 import { AccountMoveService } from '@/core/AccountMoveService.js';
 import { UtilityService } from '@/core/UtilityService.js';
-import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
 import type { ThinUser } from '@/queue/types.js';
 import Logger from '../logger.js';

@ -58,6 +55,9 @@ export class UserFollowingService implements OnModuleInit {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -79,13 +79,11 @@ export class UserFollowingService implements OnModuleInit {
 		private idService: IdService,
 		private queueService: QueueService,
 		private globalEventService: GlobalEventService,
-		private metaService: MetaService,
 		private notificationService: NotificationService,
 		private federatedInstanceService: FederatedInstanceService,
 		private webhookService: UserWebhookService,
 		private apRendererService: ApRendererService,
 		private accountMoveService: AccountMoveService,
-		private fanoutTimelineService: FanoutTimelineService,
 		private perUserFollowingChart: PerUserFollowingChart,
 		private instanceChart: InstanceChart,
 	) {
@ -172,7 +170,7 @@ export class UserFollowingService implements OnModuleInit {
 			followee.isLocked ||
 			(followeeProfile.carefulBot && follower.isBot) ||
 			(this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee) && process.env.FORCE_FOLLOW_REMOTE_USER_FOR_TESTING !== 'true') ||
-			(this.userEntityService.isLocalUser(followee) && this.userEntityService.isRemoteUser(follower) && this.utilityService.isSilencedHost((await this.metaService.fetch()).silencedHosts, follower.host))
+			(this.userEntityService.isLocalUser(followee) && this.userEntityService.isRemoteUser(follower) && this.utilityService.isSilencedHost(this.meta.silencedHosts, follower.host))
 		) {
 			let autoAccept = false;

@ -307,14 +305,14 @@ export class UserFollowingService implements OnModuleInit {
 			if (this.userEntityService.isRemoteUser(follower) && this.userEntityService.isLocalUser(followee)) {
 				this.federatedInstanceService.fetch(follower.host).then(async i => {
 					this.instancesRepository.increment({ id: i.id }, 'followingCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowing(i.host, true);
 					}
 				});
 			} else if (this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee)) {
 				this.federatedInstanceService.fetch(followee.host).then(async i => {
 					this.instancesRepository.increment({ id: i.id }, 'followersCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowers(i.host, true);
 					}
 				});
@ -439,14 +437,14 @@ export class UserFollowingService implements OnModuleInit {
 			if (this.userEntityService.isRemoteUser(follower) && this.userEntityService.isLocalUser(followee)) {
 				this.federatedInstanceService.fetch(follower.host).then(async i => {
 					this.instancesRepository.decrement({ id: i.id }, 'followingCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowing(i.host, false);
 					}
 				});
 			} else if (this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee)) {
 				this.federatedInstanceService.fetch(followee.host).then(async i => {
 					this.instancesRepository.decrement({ id: i.id }, 'followersCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowers(i.host, false);
 					}
 				});
--- a/packages/backend/src/core/WebAuthnService.ts
+++ b/packages/backend/src/core/WebAuthnService.ts
@ -12,10 +12,9 @@ import {
 } from '@simplewebauthn/server';
 import { AttestationFormat, isoCBOR, isoUint8Array } from '@simplewebauthn/server/helpers';
 import { DI } from '@/di-symbols.js';
-import type { UserSecurityKeysRepository } from '@/models/_.js';
+import type { MiMeta, UserSecurityKeysRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiUser } from '@/models/_.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import type {
@ -23,7 +22,6 @@ import type {
 	AuthenticatorTransportFuture,
 	CredentialDeviceType,
 	PublicKeyCredentialCreationOptionsJSON,
-	PublicKeyCredentialDescriptorFuture,
 	PublicKeyCredentialRequestOptionsJSON,
 	RegistrationResponseJSON,
 } from '@simplewebauthn/types';
@ -31,33 +29,33 @@ import type {
@Injectable()
 export class WebAuthnService {
 	constructor(
-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
-
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.userSecurityKeysRepository)
 		private userSecurityKeysRepository: UserSecurityKeysRepository,
-
-		private metaService: MetaService,
 	) {
 	}

 	@bindThis
-	public async getRelyingParty(): Promise<{ origin: string; rpId: string; rpName: string; rpIcon?: string; }> {
-		const instance = await this.metaService.fetch();
+	public getRelyingParty(): { origin: string; rpId: string; rpName: string; rpIcon?: string; } {
 		return {
 			origin: this.config.url,
 			rpId: this.config.hostname,
-			rpName: instance.name ?? this.config.host,
-			rpIcon: instance.iconUrl ?? undefined,
+			rpName: this.meta.name ?? this.config.host,
+			rpIcon: this.meta.iconUrl ?? undefined,
 		};
 	}

 	@bindThis
 	public async initiateRegistration(userId: MiUser['id'], userName: string, userDisplayName?: string): Promise<PublicKeyCredentialCreationOptionsJSON> {
-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();
 		const keys = await this.userSecurityKeysRepository.findBy({
 			userId: userId,
 		});
@ -104,7 +102,7 @@ export class WebAuthnService {

 		await this.redisClient.del(`webauthn:challenge:${userId}`);

-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();

 		let verification;
 		try {
@ -143,7 +141,7 @@ export class WebAuthnService {

 	@bindThis
 	public async initiateAuthentication(userId: MiUser['id']): Promise<PublicKeyCredentialRequestOptionsJSON> {
-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();
 		const keys = await this.userSecurityKeysRepository.findBy({
 			userId: userId,
 		});
@ -209,7 +207,7 @@ export class WebAuthnService {
 			}
 		}

-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();

 		let verification;
 		try {
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@ -18,7 +18,6 @@ import { NoteUpdateService } from '@/core/NoteUpdateService.js';
 import { concat, toArray, toSingle, unique } from '@/misc/prelude/array.js';
 import { AppLockService } from '@/core/AppLockService.js';
 import type Logger from '@/logger.js';
-import { MetaService } from '@/core/MetaService.js';
 import { IdService } from '@/core/IdService.js';
 import { StatusError } from '@/misc/status-error.js';
 import { UtilityService } from '@/core/UtilityService.js';
@ -26,7 +25,7 @@ import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { QueueService } from '@/core/QueueService.js';
 import { MessagingService } from '@/core/MessagingService.js';
-import type { UsersRepository, NotesRepository, FollowingsRepository, MessagingMessagesRepository, FollowRequestsRepository } from '@/models/_.js';
+import type { UsersRepository, NotesRepository, FollowingsRepository, AbuseUserReportsRepository, FollowRequestsRepository, MiMeta, MessagingMessagesRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
@ -50,6 +49,9 @@ export class ApInboxService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -69,7 +71,6 @@ export class ApInboxService {
 		private noteEntityService: NoteEntityService,
 		private utilityService: UtilityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private abuseReportService: AbuseReportService,
 		private userFollowingService: UserFollowingService,
 		private apAudienceService: ApAudienceService,
@ -322,8 +323,7 @@ export class ApInboxService {
 		}

 		// アナウンス先をブロックしてたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, this.utilityService.extractDbHost(uri))) return;
+		if (this.utilityService.isBlockedHost(this.meta.blockedHosts, this.utilityService.extractDbHost(uri))) return;

 		const relays = await this.relayService.getAcceptedRelays();
 		const fromRelay = !!actor.inbox && relays.map(r => r.inbox).includes(actor.inbox);
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@ -207,7 +207,7 @@ export class ApRequestService {

 		if ((contentType ?? '').split(';')[0].trimEnd().toLowerCase() === 'text/html' && _followAlternate === true) {
 			const html = await res.text();
-			const window = new Window({
+			const { window, happyDOM } = new Window({
 				settings: {
 					disableJavaScriptEvaluation: true,
 					disableJavaScriptFileLoading: true,
@ -241,7 +241,7 @@ export class ApRequestService {
 			} catch (e) {
 				// something went wrong parsing the HTML, ignore the whole thing
 			} finally {
-				window.close();
+				happyDOM.close().catch(err => {});
 			}
 		}
 		//#endregion
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@ -7,9 +7,8 @@ import { Inject, Injectable } from '@nestjs/common';
 import { IsNull, Not } from 'typeorm';
 import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import { InstanceActorService } from '@/core/InstanceActorService.js';
-import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository } from '@/models/_.js';
+import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { DI } from '@/di-symbols.js';
 import { UtilityService } from '@/core/UtilityService.js';
@ -29,6 +28,7 @@ export class Resolver {

 	constructor(
 		private config: Config,
+		private meta: MiMeta,
 		private usersRepository: UsersRepository,
 		private notesRepository: NotesRepository,
 		private pollsRepository: PollsRepository,
@ -36,7 +36,6 @@ export class Resolver {
 		private followRequestsRepository: FollowRequestsRepository,
 		private utilityService: UtilityService,
 		private instanceActorService: InstanceActorService,
-		private metaService: MetaService,
 		private apRequestService: ApRequestService,
 		private httpRequestService: HttpRequestService,
 		private apRendererService: ApRendererService,
@ -94,8 +93,7 @@ export class Resolver {
 			return await this.resolveLocal(value);
 		}

-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, host)) {
+		if (this.utilityService.isBlockedHost(this.meta.blockedHosts, host)) {
 			throw new Error('Instance is blocked');
 		}

@ -178,6 +176,9 @@ export class ApResolverService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -195,7 +196,6 @@ export class ApResolverService {

 		private utilityService: UtilityService,
 		private instanceActorService: InstanceActorService,
-		private metaService: MetaService,
 		private apRequestService: ApRequestService,
 		private httpRequestService: HttpRequestService,
 		private apRendererService: ApRendererService,
@ -208,6 +208,7 @@ export class ApResolverService {
 	public createResolver(): Resolver {
 		return new Resolver(
 			this.config,
+			this.meta,
 			this.usersRepository,
 			this.notesRepository,
 			this.pollsRepository,
@ -215,7 +216,6 @@ export class ApResolverService {
 			this.followRequestsRepository,
 			this.utilityService,
 			this.instanceActorService,
-			this.metaService,
 			this.apRequestService,
 			this.httpRequestService,
 			this.apRendererService,
--- a/packages/backend/src/core/activitypub/models/ApImageService.ts
+++ b/packages/backend/src/core/activitypub/models/ApImageService.ts
@ -5,10 +5,9 @@

 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
-import type { DriveFilesRepository } from '@/models/_.js';
+import type { DriveFilesRepository, MiMeta } from '@/models/_.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
-import { MetaService } from '@/core/MetaService.js';
 import { truncate } from '@/misc/truncate.js';
 import { DB_MAX_IMAGE_COMMENT_LENGTH } from '@/const.js';
 import { DriveService } from '@/core/DriveService.js';
@ -24,10 +23,12 @@ export class ApImageService {
 	private logger: Logger;

 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,

-		private metaService: MetaService,
 		private apResolverService: ApResolverService,
 		private driveService: DriveService,
 		private apLoggerService: ApLoggerService,
@ -63,12 +64,10 @@ export class ApImageService {

 		this.logger.info(`Creating the Image: ${image.url}`);

-		const instance = await this.metaService.fetch();
-
 		// Cache if remote file cache is on AND either
 		// 1. remote sensitive file is also on
 		// 2. or the image is not sensitive
-		const shouldBeCached = instance.cacheRemoteFiles && (instance.cacheRemoteSensitiveFiles || !image.sensitive);
+		const shouldBeCached = this.meta.cacheRemoteFiles && (this.meta.cacheRemoteSensitiveFiles || !image.sensitive);

 		const file = await this.driveService.uploadFromUrl({
 			url: image.url,
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@ -6,13 +6,12 @@
 import { forwardRef, Inject, Injectable } from '@nestjs/common';
 import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { EmojisRepository, MessagingMessagesRepository, NotesRepository, PollsRepository } from '@/models/_.js';
+import type { PollsRepository, EmojisRepository, MiMeta, MessagingMessagesRepository, NotesRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
 import { toArray, toSingle, unique } from '@/misc/prelude/array.js';
 import type { MiEmoji } from '@/models/Emoji.js';
-import { MetaService } from '@/core/MetaService.js';
 import { AppLockService } from '@/core/AppLockService.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import { NoteCreateService } from '@/core/NoteCreateService.js';
@ -49,6 +48,9 @@ export class ApNoteService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.pollsRepository)
 		private pollsRepository: PollsRepository,

@ -75,7 +77,6 @@ export class ApNoteService {
 		private apImageService: ApImageService,
 		private apQuestionService: ApQuestionService,
 		private apEventService: ApEventService,
-		private metaService: MetaService,
 		private messagingService: MessagingService,
 		private appLockService: AppLockService,
 		private pollService: PollService,
@ -194,7 +195,7 @@ export class ApNoteService {
 		/**
 		 * 禁止ワードチェック
 		 */
-		const hasProhibitedWords = await this.noteCreateService.checkProhibitedWordsContain({ cw, text, pollChoices: poll?.choices });
+		const hasProhibitedWords = this.noteCreateService.checkProhibitedWordsContain({ cw, text, pollChoices: poll?.choices });
 		if (hasProhibitedWords) {
 			throw new IdentifiableError('689ee33f-f97c-479a-ac49-1b9f8140af99', 'Note contains prohibited words');
 		}
@ -452,8 +453,7 @@ export class ApNoteService {
 		const uri = getApId(value);

 		// ブロックしていたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, this.utilityService.extractDbHost(uri))) {
+		if (this.utilityService.isBlockedHost(this.meta.blockedHosts, this.utilityService.extractDbHost(uri))) {
 			throw new StatusError('blocked host', 451);
 		}

--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@ -8,7 +8,7 @@ import promiseLimit from 'promise-limit';
 import { DataSource } from 'typeorm';
 import { ModuleRef } from '@nestjs/core';
 import { DI } from '@/di-symbols.js';
-import type { FollowingsRepository, InstancesRepository, UserProfilesRepository, UserPublickeysRepository, UsersRepository } from '@/models/_.js';
+import type { FollowingsRepository, InstancesRepository, MiMeta, UserProfilesRepository, UserPublickeysRepository, UsersRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import { MiUser } from '@/models/User.js';
@ -35,7 +35,6 @@ import type { UtilityService } from '@/core/UtilityService.js';
 import type { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
 import { RoleService } from '@/core/RoleService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import type { AccountMoveService } from '@/core/AccountMoveService.js';
 import { checkHttps } from '@/misc/check-https.js';
@ -62,7 +61,6 @@ export class ApPersonService implements OnModuleInit {
 	private driveFileEntityService: DriveFileEntityService;
 	private idService: IdService;
 	private globalEventService: GlobalEventService;
-	private metaService: MetaService;
 	private federatedInstanceService: FederatedInstanceService;
 	private fetchInstanceMetadataService: FetchInstanceMetadataService;
 	private cacheService: CacheService;
@ -84,6 +82,9 @@ export class ApPersonService implements OnModuleInit {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.db)
 		private db: DataSource,

@ -114,7 +115,6 @@ export class ApPersonService implements OnModuleInit {
 		this.driveFileEntityService = this.moduleRef.get('DriveFileEntityService');
 		this.idService = this.moduleRef.get('IdService');
 		this.globalEventService = this.moduleRef.get('GlobalEventService');
-		this.metaService = this.moduleRef.get('MetaService');
 		this.federatedInstanceService = this.moduleRef.get('FederatedInstanceService');
 		this.fetchInstanceMetadataService = this.moduleRef.get('FetchInstanceMetadataService');
 		this.cacheService = this.moduleRef.get('CacheService');
@ -493,10 +493,10 @@ export class ApPersonService implements OnModuleInit {
 		this.cacheService.uriPersonCache.set(user.uri, user);

 		// Register host
-		this.federatedInstanceService.fetch(host).then(async i => {
+		this.federatedInstanceService.fetch(host).then(i => {
 			this.instancesRepository.increment({ id: i.id }, 'usersCount', 1);
 			this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
-			if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.newUser(i.host);
 			}
 		});
--- a/packages/backend/src/core/chart/charts/federation.ts
+++ b/packages/backend/src/core/chart/charts/federation.ts
@ -5,10 +5,9 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import type { FollowingsRepository, InstancesRepository } from '@/models/_.js';
+import type { FollowingsRepository, InstancesRepository, MiMeta } from '@/models/_.js';
 import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
@ -24,13 +23,15 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.followingsRepository)
 		private followingsRepository: FollowingsRepository,

 		@Inject(DI.instancesRepository)
 		private instancesRepository: InstancesRepository,

-		private metaService: MetaService,
 		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
 	) {
@ -43,8 +44,6 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 	}

 	protected async tickMinor(): Promise<Partial<KVs<typeof schema>>> {
-		const meta = await this.metaService.fetch();
-
 		const suspendedInstancesQuery = this.instancesRepository.createQueryBuilder('instance')
 			.select('instance.host')
 			.where('instance.suspensionState != \'none\'');
@ -65,21 +64,21 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 			this.followingsRepository.createQueryBuilder('following')
 				.select('COUNT(DISTINCT following.followeeHost)')
 				.where('following.followeeHost IS NOT NULL')
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere(`following.followeeHost NOT IN (${ suspendedInstancesQuery.getQuery() })`)
 				.getRawOne()
 				.then(x => parseInt(x.count, 10)),
 			this.followingsRepository.createQueryBuilder('following')
 				.select('COUNT(DISTINCT following.followerHost)')
 				.where('following.followerHost IS NOT NULL')
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'following.followerHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'following.followerHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere(`following.followerHost NOT IN (${ suspendedInstancesQuery.getQuery() })`)
 				.getRawOne()
 				.then(x => parseInt(x.count, 10)),
 			this.followingsRepository.createQueryBuilder('following')
 				.select('COUNT(DISTINCT following.followeeHost)')
 				.where('following.followeeHost IS NOT NULL')
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere(`following.followeeHost NOT IN (${ suspendedInstancesQuery.getQuery() })`)
 				.andWhere(`following.followeeHost IN (${ pubsubSubQuery.getQuery() })`)
 				.setParameters(pubsubSubQuery.getParameters())
@ -88,7 +87,7 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 			this.instancesRepository.createQueryBuilder('instance')
 				.select('COUNT(instance.id)')
 				.where(`instance.host IN (${ subInstancesQuery.getQuery() })`)
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere('instance.suspensionState = \'none\'')
 				.andWhere('instance.isNotResponding = false')
 				.getRawOne()
@ -96,7 +95,7 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 			this.instancesRepository.createQueryBuilder('instance')
 				.select('COUNT(instance.id)')
 				.where(`instance.host IN (${ pubInstancesQuery.getQuery() })`)
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere('instance.suspensionState = \'none\'')
 				.andWhere('instance.isNotResponding = false')
 				.getRawOne()
--- a/packages/backend/src/core/entities/InstanceEntityService.ts
+++ b/packages/backend/src/core/entities/InstanceEntityService.ts
@ -3,19 +3,22 @@
 * SPDX-License-Identifier: AGPL-3.0-only
 */

-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import type { Packed } from '@/misc/json-schema.js';
 import type { MiInstance } from '@/models/Instance.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { MiUser } from '@/models/User.js';
+import { DI } from '@/di-symbols.js';
+import { MiMeta } from '@/models/_.js';

@Injectable()
 export class InstanceEntityService {
 	constructor(
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		private roleService: RoleService,

 		private utilityService: UtilityService,
@ -27,7 +30,6 @@ export class InstanceEntityService {
 		instance: MiInstance,
 		me?: { id: MiUser['id']; } | null | undefined,
 	): Promise<Packed<'FederationInstance'>> {
-		const meta = await this.metaService.fetch();
 		const iAmModerator = me ? await this.roleService.isModerator(me as MiUser) : false;

 		return {
@ -41,7 +43,7 @@ export class InstanceEntityService {
 			isNotResponding: instance.isNotResponding,
 			isSuspended: instance.suspensionState !== 'none',
 			suspensionState: instance.suspensionState,
-			isBlocked: this.utilityService.isBlockedHost(meta.blockedHosts, instance.host),
+			isBlocked: this.utilityService.isBlockedHost(this.meta.blockedHosts, instance.host),
 			softwareName: instance.softwareName,
 			softwareVersion: instance.softwareVersion,
 			openRegistrations: instance.openRegistrations,
@ -49,8 +51,8 @@ export class InstanceEntityService {
 			description: instance.description,
 			maintainerName: instance.maintainerName,
 			maintainerEmail: instance.maintainerEmail,
-			isSilenced: this.utilityService.isSilencedHost(meta.silencedHosts, instance.host),
-			isMediaSilenced: this.utilityService.isMediaSilencedHost(meta.mediaSilencedHosts, instance.host),
+			isSilenced: this.utilityService.isSilencedHost(this.meta.silencedHosts, instance.host),
+			isMediaSilenced: this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, instance.host),
 			iconUrl: instance.iconUrl,
 			faviconUrl: instance.faviconUrl,
 			themeColor: instance.themeColor,
--- a/packages/backend/src/core/entities/MetaEntityService.ts
+++ b/packages/backend/src/core/entities/MetaEntityService.ts
@ -10,7 +10,6 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { MiMeta } from '@/models/Meta.js';
 import type { AdsRepository } from '@/models/_.js';
 import { MAX_NOTE_TEXT_LENGTH } from '@/const.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { InstanceActorService } from '@/core/InstanceActorService.js';
@ -24,11 +23,13 @@ export class MetaEntityService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.adsRepository)
 		private adsRepository: AdsRepository,

 		private userEntityService: UserEntityService,
-		private metaService: MetaService,
 		private instanceActorService: InstanceActorService,
 	) { }

@ -37,7 +38,7 @@ export class MetaEntityService {
 		let instance = meta;

 		if (!instance) {
-			instance = await this.metaService.fetch();
+			instance = this.meta;
 		}

 		const ads = await this.adsRepository.createQueryBuilder('ads')
@ -141,7 +142,7 @@ export class MetaEntityService {
 		let instance = meta;

 		if (!instance) {
-			instance = await this.metaService.fetch();
+			instance = this.meta;
 		}

 		const packed = await this.pack(instance);
--- a/packages/backend/src/core/entities/NoteEntityService.ts
+++ b/packages/backend/src/core/entities/NoteEntityService.ts
@ -11,29 +11,45 @@ import type { Packed } from '@/misc/json-schema.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
-import type { MiNoteReaction } from '@/models/NoteReaction.js';
-import type { UsersRepository, NotesRepository, FollowingsRepository, PollsRepository, PollVotesRepository, NoteReactionsRepository, ChannelsRepository, EventsRepository } from '@/models/_.js';
+import type { UsersRepository, NotesRepository, FollowingsRepository, PollsRepository, PollVotesRepository, NoteReactionsRepository, ChannelsRepository, MiMeta, EventsRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import { DebounceLoader } from '@/misc/loader.js';
 import { IdService } from '@/core/IdService.js';
+import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
 import type { OnModuleInit } from '@nestjs/common';
 import type { CustomEmojiService } from '../CustomEmojiService.js';
 import type { ReactionService } from '../ReactionService.js';
 import type { UserEntityService } from './UserEntityService.js';
 import type { DriveFileEntityService } from './DriveFileEntityService.js';

+function mergeReactions(src: Record<string, number>, delta: Record<string, number>) {
+	const reactions = { ...src };
+	for (const [name, count] of Object.entries(delta)) {
+		if (reactions[name] != null) {
+			reactions[name] += count;
+		} else {
+			reactions[name] = count;
+		}
+	}
+	return reactions;
+}
+
@Injectable()
 export class NoteEntityService implements OnModuleInit {
 	private userEntityService: UserEntityService;
 	private driveFileEntityService: DriveFileEntityService;
 	private customEmojiService: CustomEmojiService;
 	private reactionService: ReactionService;
+	private reactionsBufferingService: ReactionsBufferingService;
 	private idService: IdService;
 	private noteLoader = new DebounceLoader(this.findNoteOrFail);

 	constructor(
 		private moduleRef: ModuleRef,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -62,6 +78,8 @@ export class NoteEntityService implements OnModuleInit {
 		//private driveFileEntityService: DriveFileEntityService,
 		//private customEmojiService: CustomEmojiService,
 		//private reactionService: ReactionService,
+		//private reactionsBufferingService: ReactionsBufferingService,
+		//private idService: IdService,
 	) {
 	}

@ -70,6 +88,7 @@ export class NoteEntityService implements OnModuleInit {
 		this.driveFileEntityService = this.moduleRef.get('DriveFileEntityService');
 		this.customEmojiService = this.moduleRef.get('CustomEmojiService');
 		this.reactionService = this.moduleRef.get('ReactionService');
+		this.reactionsBufferingService = this.moduleRef.get('ReactionsBufferingService');
 		this.idService = this.moduleRef.get('IdService');
 	}

@ -301,6 +320,7 @@ export class NoteEntityService implements OnModuleInit {
 			skipHide?: boolean;
 			withReactionAndUserPairCache?: boolean;
 			_hint_?: {
+				bufferedReactions: Map<MiNote['id'], { deltas: Record<string, number>; pairs: ([MiUser['id'], string])[] }> | null;
 				myReactions: Map<MiNote['id'], string | null>;
 				packedFiles: Map<MiNote['fileIds'][number], Packed<'DriveFile'> | null>;
 				packedUsers: Map<MiUser['id'], Packed<'UserLite'>>
@ -317,6 +337,20 @@ export class NoteEntityService implements OnModuleInit {
 		const note = typeof src === 'object' ? src : await this.noteLoader.load(src);
 		const host = note.userHost;

+		const bufferedReactions = opts._hint_?.bufferedReactions != null
+			? (opts._hint_.bufferedReactions.get(note.id) ?? { deltas: {}, pairs: [] })
+			: this.meta.enableReactionsBuffering
+				? await this.reactionsBufferingService.get(note.id)
+				: { deltas: {}, pairs: [] };
+		const reactions = mergeReactions(this.reactionService.convertLegacyReactions(note.reactions), bufferedReactions.deltas ?? {});
+		for (const [name, count] of Object.entries(reactions)) {
+			if (count <= 0) {
+				delete reactions[name];
+			}
+		}
+
+		const reactionAndUserPairCache = note.reactionAndUserPairCache.concat(bufferedReactions.pairs.map(x => x.join('/')));
+
 		let text = note.text;

 		if (note.name && (note.url ?? note.uri)) {
@ -329,7 +363,7 @@ export class NoteEntityService implements OnModuleInit {
 				: await this.channelsRepository.findOneBy({ id: note.channelId })
 			: null;

-		const reactionEmojiNames = Object.keys(note.reactions)
+		const reactionEmojiNames = Object.keys(reactions)
 			.filter(x => x.startsWith(':') && x.includes('@') && !x.includes('@.')) // リモートカスタム絵文字のみ
 			.map(x => this.reactionService.decodeReaction(x).reaction.replaceAll(':', ''));
 		await this.customEmojiService.prefetchEmojis(this.aggregateNoteEmojis([note]));
@ -353,10 +387,10 @@ export class NoteEntityService implements OnModuleInit {
 			disableRightClick: note.disableRightClick || undefined,
 			renoteCount: note.renoteCount,
 			repliesCount: note.repliesCount,
-			reactionCount: Object.values(note.reactions).reduce((a, b) => a + b, 0),
-			reactions: this.reactionService.convertLegacyReactions(note.reactions),
+			reactionCount: Object.values(reactions).reduce((a, b) => a + b, 0),
+			reactions: reactions,
 			reactionEmojis: this.customEmojiService.populateEmojis(reactionEmojiNames, host),
-			reactionAndUserPairCache: opts.withReactionAndUserPairCache ? note.reactionAndUserPairCache : undefined,
+			reactionAndUserPairCache: opts.withReactionAndUserPairCache ? reactionAndUserPairCache : undefined,
 			emojis: host != null ? this.customEmojiService.populateEmojis(note.emojis, host) : undefined,
 			tags: note.tags.length > 0 ? note.tags : undefined,
 			fileIds: note.fileIds,
@ -396,8 +430,12 @@ export class NoteEntityService implements OnModuleInit {
 				poll: note.hasPoll ? this.populatePoll(note, meId) : undefined,
 				event: note.hasEvent ? this.populateEvent(note) : undefined,

-				...(meId && Object.keys(note.reactions).length > 0 ? {
-					myReaction: this.populateMyReaction(note, meId, options?._hint_),
+				...(meId && Object.keys(reactions).length > 0 ? {
+					myReaction: this.populateMyReaction({
+						id: note.id,
+						reactions: reactions,
+						reactionAndUserPairCache: reactionAndUserPairCache,
+					}, meId, options?._hint_),
 				} : {}),
 			} : {}),
 		});
@ -420,6 +458,8 @@ export class NoteEntityService implements OnModuleInit {
 	) {
 		if (notes.length === 0) return [];

+		const bufferedReactions = this.meta.enableReactionsBuffering ? await this.reactionsBufferingService.getMany(notes.map(x => x.id)) : null;
+
 		const meId = me ? me.id : null;
 		const myReactionsMap = new Map<MiNote['id'], string | null>();
 		if (meId) {
@ -430,23 +470,33 @@ export class NoteEntityService implements OnModuleInit {

 			for (const note of notes) {
 				if (note.renote && (note.text == null && note.fileIds.length === 0)) { // pure renote
-					const reactionsCount = Object.values(note.renote.reactions).reduce((a, b) => a + b, 0);
+					const reactionsCount = Object.values(mergeReactions(note.renote.reactions, bufferedReactions?.get(note.renote.id)?.deltas ?? {})).reduce((a, b) => a + b, 0);
 					if (reactionsCount === 0) {
 						myReactionsMap.set(note.renote.id, null);
-					} else if (reactionsCount <= note.renote.reactionAndUserPairCache.length) {
+					} else if (reactionsCount <= note.renote.reactionAndUserPairCache.length + (bufferedReactions?.get(note.renote.id)?.pairs.length ?? 0)) {
+						const pairInBuffer = bufferedReactions?.get(note.renote.id)?.pairs.find(p => p[0] === meId);
+						if (pairInBuffer) {
+							myReactionsMap.set(note.renote.id, pairInBuffer[1]);
+						} else {
 							const pair = note.renote.reactionAndUserPairCache.find(p => p.startsWith(meId));
 							myReactionsMap.set(note.renote.id, pair ? pair.split('/')[1] : null);
+						}
 					} else {
 						idsNeedFetchMyReaction.add(note.renote.id);
 					}
 				} else {
 					if (note.id < oldId) {
-						const reactionsCount = Object.values(note.reactions).reduce((a, b) => a + b, 0);
+						const reactionsCount = Object.values(mergeReactions(note.reactions, bufferedReactions?.get(note.id)?.deltas ?? {})).reduce((a, b) => a + b, 0);
 						if (reactionsCount === 0) {
 							myReactionsMap.set(note.id, null);
-						} else if (reactionsCount <= note.reactionAndUserPairCache.length) {
+						} else if (reactionsCount <= note.reactionAndUserPairCache.length + (bufferedReactions?.get(note.id)?.pairs.length ?? 0)) {
+							const pairInBuffer = bufferedReactions?.get(note.id)?.pairs.find(p => p[0] === meId);
+							if (pairInBuffer) {
+								myReactionsMap.set(note.id, pairInBuffer[1]);
+							} else {
 								const pair = note.reactionAndUserPairCache.find(p => p.startsWith(meId));
 								myReactionsMap.set(note.id, pair ? pair.split('/')[1] : null);
+							}
 						} else {
 							idsNeedFetchMyReaction.add(note.id);
 						}
@ -481,6 +531,7 @@ export class NoteEntityService implements OnModuleInit {
 		return await Promise.all(notes.map(n => this.pack(n, me, {
 			...options,
 			_hint_: {
+				bufferedReactions,
 				myReactions: myReactionsMap,
 				packedFiles,
 				packedUsers,
--- a/packages/backend/src/daemons/ServerStatsService.ts
+++ b/packages/backend/src/daemons/ServerStatsService.ts
@ -3,13 +3,14 @@
 * SPDX-License-Identifier: AGPL-3.0-only
 */

-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import si from 'systeminformation';
 import Xev from 'xev';
 import * as osUtils from 'os-utils';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import type { OnApplicationShutdown } from '@nestjs/common';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';

 const ev = new Xev();

@ -23,7 +24,8 @@ export class ServerStatsService implements OnApplicationShutdown {
 	private intervalId: NodeJS.Timeout | null = null;

 	constructor(
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private meta: MiMeta,
 	) {
 	}

@ -32,7 +34,7 @@ export class ServerStatsService implements OnApplicationShutdown {
 	 */
 	@bindThis
 	public async start(): Promise<void> {
-		if (!(await this.metaService.fetch(true)).enableServerMachineStats) return;
+		if (!this.meta.enableServerMachineStats) return;

 		const log = [] as any[];

--- a/packages/backend/src/di-symbols.ts
+++ b/packages/backend/src/di-symbols.ts
@ -6,12 +6,14 @@
 export const DI = {
 	config: Symbol('config'),
 	db: Symbol('db'),
+	meta: Symbol('meta'),
 	meilisearch: Symbol('meilisearch'),
 	cloudLogging: Symbol('cloudLogging'),
 	redis: Symbol('redis'),
 	redisForPub: Symbol('redisForPub'),
 	redisForSub: Symbol('redisForSub'),
 	redisForTimelines: Symbol('redisForTimelines'),
+	redisForReactions: Symbol('redisForReactions'),
 	redisForJobQueue: Symbol('redisForJobQueue'),

 	//#region Repositories
--- a/packages/backend/src/misc/fastify-hook-handlers.ts
+++ b/packages/backend/src/misc/fastify-hook-handlers.ts
@ -8,7 +8,7 @@ import type { onRequestHookHandler } from 'fastify';
 export const handleRequestRedirectToOmitSearch: onRequestHookHandler = (request, reply, done) => {
 	const index = request.url.indexOf('?');
 	if (~index) {
-		reply.redirect(301, request.url.slice(0, index));
+		reply.redirect(request.url.slice(0, index), 301);
 	}
 	done();
 };
--- a/packages/backend/src/models/Meta.ts
+++ b/packages/backend/src/models/Meta.ts
@ -697,6 +697,11 @@ export class MiMeta {
 	})
 	public perUserListTimelineCacheMax: number;

+	@Column('boolean', {
+		default: false,
+	})
+	public enableReactionsBuffering: boolean;
+
 	@Column('integer', {
 		default: 0,
 	})
--- a/packages/backend/src/models/json-schema/role.ts
+++ b/packages/backend/src/models/json-schema/role.ts
@ -272,6 +272,26 @@ export const packedRolePoliciesSchema = {
 			type: 'integer',
 			optional: false, nullable: false,
 		},
+		canImportAntennas: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportBlocking: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportFollowing: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportMuting: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportUserLists: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
 		canEditNote: {
 			type: 'boolean',
 			optional: false, nullable: false,
--- a/packages/backend/src/queue/QueueProcessorModule.ts
+++ b/packages/backend/src/queue/QueueProcessorModule.ts
@ -14,6 +14,7 @@ import { InboxProcessorService } from './processors/InboxProcessorService.js';
 import { UserWebhookDeliverProcessorService } from './processors/UserWebhookDeliverProcessorService.js';
 import { SystemWebhookDeliverProcessorService } from './processors/SystemWebhookDeliverProcessorService.js';
 import { CheckExpiredMutingsProcessorService } from './processors/CheckExpiredMutingsProcessorService.js';
+import { BakeBufferedReactionsProcessorService } from './processors/BakeBufferedReactionsProcessorService.js';
 import { CleanChartsProcessorService } from './processors/CleanChartsProcessorService.js';
 import { CleanProcessorService } from './processors/CleanProcessorService.js';
 import { CleanRemoteFilesProcessorService } from './processors/CleanRemoteFilesProcessorService.js';
@ -52,6 +53,7 @@ import { RelationshipProcessorService } from './processors/RelationshipProcessor
 		ResyncChartsProcessorService,
 		CleanChartsProcessorService,
 		CheckExpiredMutingsProcessorService,
+		BakeBufferedReactionsProcessorService,
 		CleanProcessorService,
 		DeleteDriveFilesProcessorService,
 		ExportCustomEmojisProcessorService,
--- a/packages/backend/src/queue/QueueProcessorService.ts
+++ b/packages/backend/src/queue/QueueProcessorService.ts
@ -41,6 +41,7 @@ import { TickChartsProcessorService } from './processors/TickChartsProcessorServ
 import { ResyncChartsProcessorService } from './processors/ResyncChartsProcessorService.js';
 import { CleanChartsProcessorService } from './processors/CleanChartsProcessorService.js';
 import { CheckExpiredMutingsProcessorService } from './processors/CheckExpiredMutingsProcessorService.js';
+import { BakeBufferedReactionsProcessorService } from './processors/BakeBufferedReactionsProcessorService.js';
 import { CleanProcessorService } from './processors/CleanProcessorService.js';
 import { AggregateRetentionProcessorService } from './processors/AggregateRetentionProcessorService.js';
 import { QueueLoggerService } from './QueueLoggerService.js';
@ -124,6 +125,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		private cleanChartsProcessorService: CleanChartsProcessorService,
 		private aggregateRetentionProcessorService: AggregateRetentionProcessorService,
 		private checkExpiredMutingsProcessorService: CheckExpiredMutingsProcessorService,
+		private bakeBufferedReactionsProcessorService: BakeBufferedReactionsProcessorService,
 		private cleanProcessorService: CleanProcessorService,
 	) {
 		this.logger = this.queueLoggerService.logger;
@ -153,6 +155,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 					case 'cleanCharts': return this.cleanChartsProcessorService.process();
 					case 'aggregateRetention': return this.aggregateRetentionProcessorService.process();
 					case 'checkExpiredMutings': return this.checkExpiredMutingsProcessorService.process();
+					case 'bakeBufferedReactions': return this.bakeBufferedReactionsProcessorService.process();
 					case 'clean': return this.cleanProcessorService.process();
 					default: throw new Error(`unrecognized job type ${job.name} for system`);
 				}
--- a/packages/backend/src/queue/processors/BakeBufferedReactionsProcessorService.ts
+++ b/packages/backend/src/queue/processors/BakeBufferedReactionsProcessorService.ts
@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import type Logger from '@/logger.js';
+import { bindThis } from '@/decorators.js';
+import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
+import { QueueLoggerService } from '../QueueLoggerService.js';
+import type * as Bull from 'bullmq';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+
+@Injectable()
+export class BakeBufferedReactionsProcessorService {
+	private logger: Logger;
+
+	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
+		private reactionsBufferingService: ReactionsBufferingService,
+		private queueLoggerService: QueueLoggerService,
+	) {
+		this.logger = this.queueLoggerService.logger.createSubLogger('bake-buffered-reactions');
+	}
+
+	@bindThis
+	public async process(): Promise<void> {
+		if (!this.meta.enableReactionsBuffering) {
+			this.logger.info('Reactions buffering is disabled. Skipping...');
+			return;
+		}
+
+		this.logger.info('Baking buffered reactions...');
+
+		await this.reactionsBufferingService.bake();
+
+		this.logger.succ('All buffered reactions baked.');
+	}
+}
--- a/packages/backend/src/queue/processors/DeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeliverProcessorService.ts
@ -7,9 +7,8 @@ import { Inject, Injectable } from '@nestjs/common';
 import * as Bull from 'bullmq';
 import { Not } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { InstancesRepository } from '@/models/_.js';
+import type { InstancesRepository, MiMeta } from '@/models/_.js';
 import type Logger from '@/logger.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ApRequestService } from '@/core/activitypub/ApRequestService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { FetchInstanceMetadataService } from '@/core/FetchInstanceMetadataService.js';
@ -31,10 +30,12 @@ export class DeliverProcessorService {
 	private latest: string | null;

 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.instancesRepository)
 		private instancesRepository: InstancesRepository,

-		private metaService: MetaService,
 		private utilityService: UtilityService,
 		private federatedInstanceService: FederatedInstanceService,
 		private fetchInstanceMetadataService: FetchInstanceMetadataService,
@ -53,8 +54,7 @@ export class DeliverProcessorService {
 		const { host } = new URL(job.data.to);

 		// ブロックしてたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, this.utilityService.toPuny(host))) {
+		if (this.utilityService.isBlockedHost(this.meta.blockedHosts, this.utilityService.toPuny(host))) {
 			return 'skip (blocked)';
 		}

@ -88,7 +88,7 @@ export class DeliverProcessorService {
 				this.apRequestChart.deliverSucc();
 				this.federationChart.deliverd(i.host, true);

-				if (meta.enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.requestSent(i.host, true);
 				}
 			});
@ -120,7 +120,7 @@ export class DeliverProcessorService {
 				this.apRequestChart.deliverFail();
 				this.federationChart.deliverd(i.host, false);

-				if (meta.enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.requestSent(i.host, false);
 				}
 			});
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@ -4,11 +4,10 @@
 */

 import { URL } from 'node:url';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import httpSignature from '@peertube/http-signature';
 import * as Bull from 'bullmq';
 import type Logger from '@/logger.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { FetchInstanceMetadataService } from '@/core/FetchInstanceMetadataService.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
@ -28,14 +27,18 @@ import { bindThis } from '@/decorators.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type { InboxJobData } from '../types.js';
+import { MiMeta } from '@/models/Meta.js';
+import { DI } from '@/di-symbols.js';

@Injectable()
 export class InboxProcessorService {
 	private logger: Logger;

 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		private utilityService: UtilityService,
-		private metaService: MetaService,
 		private apInboxService: ApInboxService,
 		private federatedInstanceService: FederatedInstanceService,
 		private fetchInstanceMetadataService: FetchInstanceMetadataService,
@ -64,8 +67,7 @@ export class InboxProcessorService {
 		const host = this.utilityService.toPuny(new URL(signature.keyId).hostname);

 		// ブロックしてたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, host)) {
+		if (this.utilityService.isBlockedHost(this.meta.blockedHosts, host)) {
 			return `Blocked request: ${host}`;
 		}

@ -166,7 +168,7 @@ export class InboxProcessorService {

 				// ブロックしてたら中断
 				const ldHost = this.utilityService.extractDbHost(authUser.user.uri);
-				if (this.utilityService.isBlockedHost(meta.blockedHosts, ldHost)) {
+				if (this.utilityService.isBlockedHost(this.meta.blockedHosts, ldHost)) {
 					throw new Bull.UnrecoverableError(`Blocked request: ${ldHost}`);
 				}
 			} else {
@ -197,7 +199,7 @@ export class InboxProcessorService {
 			this.apRequestChart.inbox();
 			this.federationChart.inbox(i.host);

-			if (meta.enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.requestReceived(i.host);
 			}
 		});
--- a/packages/backend/src/server/FileServerService.ts
+++ b/packages/backend/src/server/FileServerService.ts
@ -82,7 +82,7 @@ export class FileServerService {
 					.catch(err => this.errorHandler(request, reply, err));
 			});
 			fastify.get<{ Params: { key: string; } }>('/files/:key/*', async (request, reply) => {
-				return await reply.redirect(301, `${this.config.url}/files/${request.params.key}`);
+				return await reply.redirect(`${this.config.url}/files/${request.params.key}`, 301);
 			});
 			done();
 		});
@ -147,12 +147,12 @@ export class FileServerService {
 						url.searchParams.set('static', '1');

 						file.cleanup();
-						return await reply.redirect(301, url.toString());
+						return await reply.redirect(url.toString(), 301);
 					} else if (file.mime.startsWith('video/')) {
 						const externalThumbnail = this.videoProcessingService.getExternalVideoThumbnailUrl(file.url);
 						if (externalThumbnail) {
 							file.cleanup();
-							return await reply.redirect(301, externalThumbnail);
+							return await reply.redirect(externalThumbnail, 301);
 						}

 						image = await this.videoProcessingService.generateVideoThumbnail(file.path);
@ -167,7 +167,7 @@ export class FileServerService {
 						url.searchParams.set('url', file.url);

 						file.cleanup();
-						return await reply.redirect(301, url.toString());
+						return await reply.redirect(url.toString(), 301);
 					}
 				}

@ -314,8 +314,8 @@ export class FileServerService {
 			}

 			return await reply.redirect(
-				301,
 				url.toString(),
+				301,
 			);
 		}

--- a/packages/backend/src/server/HealthServerService.ts
+++ b/packages/backend/src/server/HealthServerService.ts
@ -27,6 +27,9 @@ export class HealthServerService {
 		@Inject(DI.redisForTimelines)
 		private redisForTimelines: Redis.Redis,

+		@Inject(DI.redisForReactions)
+		private redisForReactions: Redis.Redis,
+
 		@Inject(DI.db)
 		private db: DataSource,

@ -43,6 +46,7 @@ export class HealthServerService {
 				this.redisForPub.ping(),
 				this.redisForSub.ping(),
 				this.redisForTimelines.ping(),
+				this.redisForReactions.ping(),
 				this.db.query('SELECT 1'),
 				...(this.meilisearch ? [this.meilisearch.health()] : []),
 			]).then(() => 200, () => 503));
--- a/packages/backend/src/server/ServerService.ts
+++ b/packages/backend/src/server/ServerService.ts
@ -13,7 +13,7 @@ import fastifyRawBody from 'fastify-raw-body';
 import { IsNull } from 'typeorm';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import type { Config } from '@/config.js';
-import type { EmojisRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type { EmojisRepository, MiMeta, UserProfilesRepository, UsersRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
 import type Logger from '@/logger.js';
 import * as Acct from '@/misc/acct.js';
@ -21,7 +21,6 @@ import { genIdenticon } from '@/misc/gen-identicon.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ActivityPubServerService } from './ActivityPubServerService.js';
 import { NodeinfoServerService } from './NodeinfoServerService.js';
 import { ApiServerService } from './api/ApiServerService.js';
@ -44,6 +43,9 @@ export class ServerService implements OnApplicationShutdown {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -53,7 +55,6 @@ export class ServerService implements OnApplicationShutdown {
 		@Inject(DI.emojisRepository)
 		private emojisRepository: EmojisRepository,

-		private metaService: MetaService,
 		private userEntityService: UserEntityService,
 		private apiServerService: ApiServerService,
 		private openApiServerService: OpenApiServerService,
@ -165,8 +166,8 @@ export class ServerService implements OnApplicationShutdown {
 			}

 			return await reply.redirect(
-				301,
 				url.toString(),
+				301,
 			);
 		});

@ -193,7 +194,7 @@ export class ServerService implements OnApplicationShutdown {
 			reply.header('Content-Type', 'image/png');
 			reply.header('Cache-Control', 'public, max-age=86400');

-			if ((await this.metaService.fetch()).enableIdenticonGeneration) {
+			if (this.meta.enableIdenticonGeneration) {
 				return await genIdenticon(request.params.x);
 			} else {
 				return reply.redirect('/static-assets/avatar.png');
--- a/packages/backend/src/server/api/ApiCallService.ts
+++ b/packages/backend/src/server/api/ApiCallService.ts
@ -13,8 +13,7 @@ import { getIpHash } from '@/misc/get-ip-hash.js';
 import type { MiLocalUser, MiUser } from '@/models/User.js';
 import type { MiAccessToken } from '@/models/AccessToken.js';
 import type Logger from '@/logger.js';
-import type { UserIpsRepository } from '@/models/_.js';
-import { MetaService } from '@/core/MetaService.js';
+import type { MiMeta, UserIpsRepository } from '@/models/_.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { bindThis } from '@/decorators.js';
 import { RoleService } from '@/core/RoleService.js';
@ -41,13 +40,15 @@ export class ApiCallService implements OnApplicationShutdown {
 	private userIpHistoriesClearIntervalId: NodeJS.Timeout;

 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.config)
 		private config: Config,

 		@Inject(DI.userIpsRepository)
 		private userIpsRepository: UserIpsRepository,

-		private metaService: MetaService,
 		private authenticateService: AuthenticateService,
 		private rateLimiterService: RateLimiterService,
 		private roleService: RoleService,
@ -65,15 +66,6 @@ export class ApiCallService implements OnApplicationShutdown {
 		let statusCode = err.httpStatusCode;
 		if (err.httpStatusCode === 401) {
 			reply.header('WWW-Authenticate', 'Bearer realm="CherryPick"');
-		} else if (err.kind === 'client') {
-			reply.header('WWW-Authenticate', `Bearer realm="CherryPick", error="invalid_request", error_description="${err.message}"`);
-			statusCode = statusCode ?? 400;
-		} else if (err.kind === 'permission') {
-			// (ROLE_PERMISSION_DENIEDは関係ない)
-			if (err.code === 'PERMISSION_DENIED') {
-				reply.header('WWW-Authenticate', `Bearer realm="CherryPick", error="insufficient_scope", error_description="${err.message}"`);
-			}
-			statusCode = statusCode ?? 403;
 		} else if (err.code === 'RATE_LIMIT_EXCEEDED') {
 			const info: unknown = err.info;
 			const unixEpochInSeconds = Date.now();
@ -84,6 +76,15 @@ export class ApiCallService implements OnApplicationShutdown {
 			} else {
 				this.logger.warn(`rate limit information has unexpected type ${typeof(err.info?.reset)}`);
 			}
+		} else if (err.kind === 'client') {
+			reply.header('WWW-Authenticate', `Bearer realm="CherryPick", error="invalid_request", error_description="${err.message}"`);
+			statusCode = statusCode ?? 400;
+		} else if (err.kind === 'permission') {
+			// (ROLE_PERMISSION_DENIEDは関係ない)
+			if (err.code === 'PERMISSION_DENIED') {
+				reply.header('WWW-Authenticate', `Bearer realm="CherryPick", error="insufficient_scope", error_description="${err.message}"`);
+			}
+			statusCode = statusCode ?? 403;
 		} else if (!statusCode) {
 			statusCode = 500;
 		}
@ -266,9 +267,8 @@ export class ApiCallService implements OnApplicationShutdown {
 	}

 	@bindThis
-	private async logIp(request: FastifyRequest, user: MiLocalUser) {
-		const meta = await this.metaService.fetch();
-		if (!meta.enableIpLogging) return;
+	private logIp(request: FastifyRequest, user: MiLocalUser) {
+		if (!this.meta.enableIpLogging) return;
 		const ip = request.ip;
 		const ips = this.userIpHistories.get(user.id);
 		if (ips == null || !ips.has(ip)) {
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@ -7,9 +7,8 @@ import { Inject, Injectable } from '@nestjs/common';
 import bcrypt from 'bcryptjs';
 import { IsNull } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { RegistrationTicketsRepository, UsedUsernamesRepository, UserPendingsRepository, UserProfilesRepository, UsersRepository, MiRegistrationTicket } from '@/models/_.js';
+import type { RegistrationTicketsRepository, UsedUsernamesRepository, UserPendingsRepository, UserProfilesRepository, UsersRepository, MiRegistrationTicket, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
-import { MetaService } from '@/core/MetaService.js';
 import { CaptchaService } from '@/core/CaptchaService.js';
 import { IdService } from '@/core/IdService.js';
 import { SignupService } from '@/core/SignupService.js';
@ -28,6 +27,9 @@ export class SignupApiService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -45,7 +47,6 @@ export class SignupApiService {

 		private userEntityService: UserEntityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private captchaService: CaptchaService,
 		private signupService: SignupService,
 		private signinService: SigninService,
@ -72,31 +73,29 @@ export class SignupApiService {
 	) {
 		const body = request.body;

-		const instance = await this.metaService.fetch(true);
-
 		// Verify *Captcha
 		// ただしテスト時はこの機構は障害となるため無効にする
 		if (process.env.NODE_ENV !== 'test') {
-			if (instance.enableHcaptcha && instance.hcaptchaSecretKey) {
-				await this.captchaService.verifyHcaptcha(instance.hcaptchaSecretKey, body['hcaptcha-response']).catch(err => {
+			if (this.meta.enableHcaptcha && this.meta.hcaptchaSecretKey) {
+				await this.captchaService.verifyHcaptcha(this.meta.hcaptchaSecretKey, body['hcaptcha-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}

-			if (instance.enableMcaptcha && instance.mcaptchaSecretKey && instance.mcaptchaSitekey && instance.mcaptchaInstanceUrl) {
-				await this.captchaService.verifyMcaptcha(instance.mcaptchaSecretKey, instance.mcaptchaSitekey, instance.mcaptchaInstanceUrl, body['m-captcha-response']).catch(err => {
+			if (this.meta.enableMcaptcha && this.meta.mcaptchaSecretKey && this.meta.mcaptchaSitekey && this.meta.mcaptchaInstanceUrl) {
+				await this.captchaService.verifyMcaptcha(this.meta.mcaptchaSecretKey, this.meta.mcaptchaSitekey, this.meta.mcaptchaInstanceUrl, body['m-captcha-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}

-			if (instance.enableRecaptcha && instance.recaptchaSecretKey) {
-				await this.captchaService.verifyRecaptcha(instance.recaptchaSecretKey, body['g-recaptcha-response']).catch(err => {
+			if (this.meta.enableRecaptcha && this.meta.recaptchaSecretKey) {
+				await this.captchaService.verifyRecaptcha(this.meta.recaptchaSecretKey, body['g-recaptcha-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}

-			if (instance.enableTurnstile && instance.turnstileSecretKey) {
-				await this.captchaService.verifyTurnstile(instance.turnstileSecretKey, body['turnstile-response']).catch(err => {
+			if (this.meta.enableTurnstile && this.meta.turnstileSecretKey) {
+				await this.captchaService.verifyTurnstile(this.meta.turnstileSecretKey, body['turnstile-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}
@ -108,7 +107,7 @@ export class SignupApiService {
 		const invitationCode = body['invitationCode'];
 		const emailAddress = body['emailAddress'];

-		if (instance.emailRequiredForSignup) {
+		if (this.meta.emailRequiredForSignup) {
 			if (emailAddress == null || typeof emailAddress !== 'string') {
 				reply.code(400);
 				return;
@ -123,7 +122,7 @@ export class SignupApiService {

 		let ticket: MiRegistrationTicket | null = null;

-		if (instance.disableRegistration) {
+		if (this.meta.disableRegistration) {
 			if (invitationCode == null || typeof invitationCode !== 'string') {
 				reply.code(400);
 				return;
@ -144,7 +143,7 @@ export class SignupApiService {
 			}

 			// メアド認証が有効の場合
-			if (instance.emailRequiredForSignup) {
+			if (this.meta.emailRequiredForSignup) {
 				// メアド認証済みならエラー
 				if (ticket.usedBy) {
 					reply.code(400);
@ -162,7 +161,7 @@ export class SignupApiService {
 			}
 		}

-		if (instance.emailRequiredForSignup) {
+		if (this.meta.emailRequiredForSignup) {
 			if (await this.usersRepository.exists({ where: { usernameLower: username.toLowerCase(), host: IsNull() } })) {
 				throw new FastifyReplyError(400, 'DUPLICATED_USERNAME');
 			}
@ -172,7 +171,7 @@ export class SignupApiService {
 				throw new FastifyReplyError(400, 'USED_USERNAME');
 			}

-			const isPreserved = instance.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
+			const isPreserved = this.meta.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
 			if (isPreserved) {
 				throw new FastifyReplyError(400, 'DENIED_USERNAME');
 			}
--- a/packages/backend/src/server/api/endpoints/admin/meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/meta.ts
@ -429,6 +429,10 @@ export const meta = {
 				type: 'number',
 				optional: false, nullable: false,
 			},
+			enableReactionsBuffering: {
+				type: 'boolean',
+				optional: false, nullable: false,
+			},
 			notesPerOneAd: {
 				type: 'number',
 				optional: false, nullable: false,
@ -716,6 +720,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				perRemoteUserUserTimelineCacheMax: instance.perRemoteUserUserTimelineCacheMax,
 				perUserHomeTimelineCacheMax: instance.perUserHomeTimelineCacheMax,
 				perUserListTimelineCacheMax: instance.perUserListTimelineCacheMax,
+				enableReactionsBuffering: instance.enableReactionsBuffering,
 				notesPerOneAd: instance.notesPerOneAd,
 				summalyProxy: instance.urlPreviewSummaryProxyUrl,
 				urlPreviewEnabled: instance.urlPreviewEnabled,
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@ -163,6 +163,7 @@ export const paramDef = {
 		perRemoteUserUserTimelineCacheMax: { type: 'integer' },
 		perUserHomeTimelineCacheMax: { type: 'integer' },
 		perUserListTimelineCacheMax: { type: 'integer' },
+		enableReactionsBuffering: { type: 'boolean' },
 		notesPerOneAd: { type: 'integer' },
 		silencedHosts: {
 			type: 'array',
@ -705,6 +706,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.perUserListTimelineCacheMax = ps.perUserListTimelineCacheMax;
 			}

+			if (ps.enableReactionsBuffering !== undefined) {
+				set.enableReactionsBuffering = ps.enableReactionsBuffering;
+			}
+
 			if (ps.notesPerOneAd !== undefined) {
 				set.notesPerOneAd = ps.notesPerOneAd;
 			}
--- a/packages/backend/src/server/api/endpoints/ap/show.ts
+++ b/packages/backend/src/server/api/endpoints/ap/show.ts
@ -3,7 +3,7 @@
 * SPDX-License-Identifier: AGPL-3.0-only
 */

-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import ms from 'ms';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { MiNote } from '@/models/Note.js';
@ -12,7 +12,6 @@ import { isActor, isPost, getApId } from '@/core/activitypub/type.js';
 import type { SchemaType } from '@/misc/json-schema.js';
 import { ApResolverService } from '@/core/activitypub/ApResolverService.js';
 import { ApDbResolverService } from '@/core/activitypub/ApDbResolverService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
 import { ApNoteService } from '@/core/activitypub/models/ApNoteService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
@ -20,6 +19,8 @@ import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { bindThis } from '@/decorators.js';
 import { ApiError } from '../../error.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';

 export const meta = {
 	tags: ['federation'],
@ -88,10 +89,12 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		private utilityService: UtilityService,
 		private userEntityService: UserEntityService,
 		private noteEntityService: NoteEntityService,
-		private metaService: MetaService,
 		private apResolverService: ApResolverService,
 		private apDbResolverService: ApDbResolverService,
 		private apPersonService: ApPersonService,
@ -113,8 +116,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 	@bindThis
 	private async fetchAny(uri: string, me: MiLocalUser | null | undefined): Promise<SchemaType<typeof meta['res']> | null> {
 		// ブロックしてたら中断
-		const fetchedMeta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(fetchedMeta.blockedHosts, this.utilityService.extractDbHost(uri))) return null;
+		if (this.utilityService.isBlockedHost(this.serverSettings.blockedHosts, this.utilityService.extractDbHost(uri))) return null;

 		let local = await this.mergePack(me, ...await Promise.all([
 			this.apDbResolverService.getUserFromApId(uri),
--- a/packages/backend/src/server/api/endpoints/channels/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/channels/timeline.ts
@ -5,14 +5,12 @@

 import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import type { ChannelsRepository, NotesRepository } from '@/models/_.js';
+import type { ChannelsRepository, MiMeta, NotesRepository } from '@/models/_.js';
 import { QueryService } from '@/core/QueryService.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
 import { IdService } from '@/core/IdService.js';
-import { CacheService } from '@/core/CacheService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { ApiError } from '../../error.js';
@ -58,6 +56,9 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

@ -68,16 +69,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private noteEntityService: NoteEntityService,
 		private queryService: QueryService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
-		private cacheService: CacheService,
 		private activeUsersChart: ActiveUsersChart,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
 			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.gen(ps.sinceDate!) : null);

-			const serverSettings = await this.metaService.fetch();
-
 			const channel = await this.channelsRepository.findOneBy({
 				id: ps.channelId,
 			});
@ -88,7 +85,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 			if (me) this.activeUsersChart.read(me);

-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				return await this.noteEntityService.packMany(await this.getFromDb({ untilId, sinceId, limit: ps.limit, channelId: channel.id }, me), me);
 			}

--- a/packages/backend/src/server/api/endpoints/drive.ts
+++ b/packages/backend/src/server/api/endpoints/drive.ts
@ -5,7 +5,6 @@

 import { Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import { RoleService } from '@/core/RoleService.js';

@ -41,14 +40,10 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
-		private metaService: MetaService,
 		private driveFileEntityService: DriveFileEntityService,
 		private roleService: RoleService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const instance = await this.metaService.fetch(true);
-
-			// Calculate drive usage
 			const usage = await this.driveFileEntityService.calcDriveUsageOf(me.id);

 			const policies = await this.roleService.getUserPolicies(me.id);
--- a/packages/backend/src/server/api/endpoints/drive/files/create.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/create.ts
@ -4,14 +4,15 @@
 */

 import ms from 'ms';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { DB_MAX_IMAGE_COMMENT_LENGTH } from '@/const.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DriveService } from '@/core/DriveService.js';
 import { ApiError } from '../../../error.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';

 export const meta = {
 	tags: ['drive'],
@ -73,8 +74,10 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		private driveFileEntityService: DriveFileEntityService,
-		private metaService: MetaService,
 		private driveService: DriveService,
 	) {
 		super(meta, paramDef, async (ps, me, _1, _2, file, cleanup, ip, headers) => {
@ -91,8 +94,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				}
 			}

-			const instance = await this.metaService.fetch();
-
 			try {
 				// Create file
 				const driveFile = await this.driveService.addFile({
@ -103,8 +104,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					folderId: ps.folderId,
 					force: ps.force,
 					sensitive: ps.isSensitive,
-					requestIp: instance.enableIpLogging ? ip : null,
-					requestHeaders: instance.enableIpLogging ? headers : null,
+					requestIp: this.serverSettings.enableIpLogging ? ip : null,
+					requestHeaders: this.serverSettings.enableIpLogging ? headers : null,
 				});
 				return await this.driveFileEntityService.pack(driveFile, { self: true });
 			} catch (err) {
--- a/packages/backend/src/server/api/endpoints/i/import-antennas.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-antennas.ts
@ -16,6 +16,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportAntennas',
 	prohibitMoved: true,

 	limit: {
--- a/packages/backend/src/server/api/endpoints/i/import-blocking.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-blocking.ts
@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportBlocking',
 	prohibitMoved: true,

 	limit: {
--- a/packages/backend/src/server/api/endpoints/i/import-following.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-following.ts
@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportFollowing',
 	prohibitMoved: true,
 	limit: {
 		duration: ms('1hour'),
--- a/packages/backend/src/server/api/endpoints/i/import-muting.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-muting.ts
@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportMuting',
 	prohibitMoved: true,

 	limit: {
--- a/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportUserLists',
 	prohibitMoved: true,
 	limit: {
 		duration: ms('1hour'),
--- a/packages/backend/src/server/api/endpoints/i/update-email.ts
+++ b/packages/backend/src/server/api/endpoints/i/update-email.ts
@ -7,7 +7,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import ms from 'ms';
 import bcrypt from 'bcryptjs';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import type { UserProfilesRepository } from '@/models/_.js';
+import type { MiMeta, UserProfilesRepository } from '@/models/_.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { EmailService } from '@/core/EmailService.js';
 import type { Config } from '@/config.js';
@ -15,7 +15,6 @@ import { DI } from '@/di-symbols.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { L_CHARS, secureRndstr } from '@/misc/secure-rndstr.js';
 import { UserAuthService } from '@/core/UserAuthService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@ -70,10 +69,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.userProfilesRepository)
 		private userProfilesRepository: UserProfilesRepository,

-		private metaService: MetaService,
 		private userEntityService: UserEntityService,
 		private emailService: EmailService,
 		private userAuthService: UserAuthService,
@ -105,7 +106,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				if (!res.available) {
 					throw new ApiError(meta.errors.unavailable);
 				}
-			} else if ((await this.metaService.fetch()).emailRequiredForSignup) {
+			} else if (this.serverSettings.emailRequiredForSignup) {
 				throw new ApiError(meta.errors.emailRequired);
 			}

--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@ -17,8 +17,6 @@ import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { NoteCreateService } from '@/core/NoteCreateService.js';
 import { DI } from '@/di-symbols.js';
 import { isQuote, isRenote } from '@/misc/is-renote.js';
-import { MetaService } from '@/core/MetaService.js';
-import { UtilityService } from '@/core/UtilityService.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { ApiError } from '../../error.js';

--- a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
@ -5,7 +5,7 @@

 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository, ChannelFollowingsRepository } from '@/models/_.js';
+import type { NotesRepository, ChannelFollowingsRepository, MiMeta } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
@ -16,7 +16,6 @@ import { CacheService } from '@/core/CacheService.js';
 import { FanoutTimelineName } from '@/core/FanoutTimelineService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { ApiError } from '../../error.js';
@ -75,6 +74,9 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

@ -88,7 +90,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private cacheService: CacheService,
 		private queryService: QueryService,
 		private userFollowingService: UserFollowingService,
-		private metaService: MetaService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
@ -102,9 +103,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 			if (ps.withReplies && ps.withFiles) throw new ApiError(meta.errors.bothWithRepliesAndWithFiles);

-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
@ -158,7 +157,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				allowPartial: ps.allowPartial,
 				me,
 				redisTimelines: timelineConfig,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				alwaysIncludeMyNotes: true,
 				excludePureRenotes: !ps.withRenotes,
 				withCats: ps.withCats,
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@ -5,16 +5,14 @@

 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository } from '@/models/_.js';
+import type { MiMeta, NotesRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
 import { RoleService } from '@/core/RoleService.js';
 import { IdService } from '@/core/IdService.js';
-import { CacheService } from '@/core/CacheService.js';
 import { QueryService } from '@/core/QueryService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { ApiError } from '../../error.js';
@ -67,6 +65,9 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

@ -74,10 +75,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private roleService: RoleService,
 		private activeUsersChart: ActiveUsersChart,
 		private idService: IdService,
-		private cacheService: CacheService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private queryService: QueryService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@ -90,9 +89,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 			if (ps.withReplies && ps.withFiles) throw new ApiError(meta.errors.bothWithRepliesAndWithFiles);

-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
@ -117,7 +114,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				limit: ps.limit,
 				allowPartial: ps.allowPartial,
 				me,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines:
 					ps.withFiles ? ['localTimelineWithFiles']
 					: ps.withReplies ? ['localTimeline', 'localTimelineWithReplies']
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@ -5,7 +5,7 @@

 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository, ChannelFollowingsRepository } from '@/models/_.js';
+import type { NotesRepository, ChannelFollowingsRepository, MiMeta } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { QueryService } from '@/core/QueryService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
@ -15,7 +15,6 @@ import { IdService } from '@/core/IdService.js';
 import { CacheService } from '@/core/CacheService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
 import { MiLocalUser } from '@/models/User.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';

 export const meta = {
@ -57,6 +56,9 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

@ -70,15 +72,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private userFollowingService: UserFollowingService,
 		private queryService: QueryService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
 			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.gen(ps.sinceDate!) : null);

-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
@ -110,7 +109,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				limit: ps.limit,
 				allowPartial: ps.allowPartial,
 				me,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? [`homeTimelineWithFiles:${me.id}`] : [`homeTimeline:${me.id}`],
 				alwaysIncludeMyNotes: true,
 				excludePureRenotes: !ps.withRenotes,
--- a/packages/backend/src/server/api/endpoints/notes/translate.ts
+++ b/packages/backend/src/server/api/endpoints/notes/translate.ts
@ -5,17 +5,18 @@

 import { URLSearchParams } from 'node:url';
 import fs from 'node:fs';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { translate } from '@vitalets/google-translate-api';
 import { TranslationServiceClient } from '@google-cloud/translate';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { GetterService } from '@/server/api/GetterService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ApiError } from '../../error.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';

 export const meta = {
 	tags: ['notes'],
@ -68,9 +69,11 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		private noteEntityService: NoteEntityService,
 		private getterService: GetterService,
-		private metaService: MetaService,
 		private httpRequestService: HttpRequestService,
 		private roleService: RoleService,
 	) {
@ -93,15 +96,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				return;
 			}

-			const instance = await this.metaService.fetch();
-
 			const translatorServices = [
 				'deepl',
 				'google_no_api',
 				'ctav3',
 			];

-			if (instance.translatorType == null || !translatorServices.includes(instance.translatorType)) {
+			if (this.serverSettings.translatorType == null || !translatorServices.includes(this.serverSettings.translatorType)) {
 				throw new ApiError(meta.errors.noTranslateService);
 			}

@ -109,12 +110,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			if (targetLang.includes('-')) targetLang = targetLang.split('-')[0];

 			let translationResult;
-			if (instance.translatorType === 'deepl') {
-				if (instance.deeplAuthKey == null) {
+			if (this.serverSettings.translatorType === 'deepl') {
+				if (this.serverSettings.deeplAuthKey == null) {
 					throw new ApiError(meta.errors.unavailable);
 				}
-				translationResult = await this.translateDeepL((note.cw ? note.cw + '\n' : '') + note.text, targetLang, instance.deeplAuthKey, instance.deeplIsPro, instance.translatorType);
-			} else if (instance.translatorType === 'google_no_api') {
+				translationResult = await this.translateDeepL((note.cw ? note.cw + '\n' : '') + note.text, targetLang, this.serverSettings.deeplAuthKey, this.serverSettings.deeplIsPro, this.serverSettings.translatorType);
+			} else if (this.serverSettings.translatorType === 'google_no_api') {
 				let targetLang = ps.targetLang;
 				if (targetLang.includes('-')) targetLang = targetLang.split('-')[0];

@ -123,14 +124,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				return {
 					sourceLang: raw.src,
 					text: text,
-					translator: translatorServices,
+					translator: this.serverSettings.translatorType, // 修正点: 配列ではなく単一の文字列
 				};
-			} else if (instance.translatorType === 'ctav3') {
-				if (instance.ctav3SaKey == null) return Promise.resolve(204);
-				else if (instance.ctav3ProjectId == null) return Promise.resolve(204);
-				else if (instance.ctav3Location == null) return Promise.resolve(204);
+			} else if (this.serverSettings.translatorType === 'ctav3') {
+				if (this.serverSettings.ctav3SaKey == null) return Promise.resolve(204);
+				else if (this.serverSettings.ctav3ProjectId == null) return Promise.resolve(204);
+				else if (this.serverSettings.ctav3Location == null) return Promise.resolve(204);
 				translationResult = await this.apiCloudTranslationAdvanced(
-					(note.cw ? note.cw + '\n' : '') + note.text, targetLang, instance.ctav3SaKey, instance.ctav3ProjectId, instance.ctav3Location, instance.ctav3Model, instance.ctav3Glossary, instance.translatorType,
+					(note.cw ? note.cw + '\n' : '') + note.text, targetLang, this.serverSettings.ctav3SaKey, this.serverSettings.ctav3ProjectId, this.serverSettings.ctav3Location, this.serverSettings.ctav3Model, this.serverSettings.ctav3Glossary, this.serverSettings.translatorType,
 				);
 			} else {
 				throw new Error('Unsupported translator type');
--- a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
@ -5,16 +5,14 @@

 import { Inject, Injectable } from '@nestjs/common';
 import { Brackets } from 'typeorm';
-import type { MiUserList, NotesRepository, UserListMembershipsRepository, UserListsRepository } from '@/models/_.js';
+import type { MiMeta, MiUserList, NotesRepository, UserListMembershipsRepository, UserListsRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
-import { CacheService } from '@/core/CacheService.js';
 import { IdService } from '@/core/IdService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { MiLocalUser } from '@/models/User.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { ApiError } from '../../error.js';

@ -70,6 +68,9 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

@ -81,11 +82,9 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 		private noteEntityService: NoteEntityService,
 		private activeUsersChart: ActiveUsersChart,
-		private cacheService: CacheService,
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private queryService: QueryService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@ -100,9 +99,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				throw new ApiError(meta.errors.noSuchList);
 			}

-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb(list, {
 					untilId,
 					sinceId,
@ -126,7 +123,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				limit: ps.limit,
 				allowPartial: ps.allowPartial,
 				me,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? [`userListTimelineWithFiles:${list.id}`] : [`userListTimeline:${list.id}`],
 				alwaysIncludeMyNotes: true,
 				excludePureRenotes: !ps.withRenotes,
--- a/packages/backend/src/server/api/endpoints/pinned-users.ts
+++ b/packages/backend/src/server/api/endpoints/pinned-users.ts
@ -5,11 +5,10 @@

 import { IsNull } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsersRepository } from '@/models/_.js';
 import * as Acct from '@/misc/acct.js';
 import type { MiUser } from '@/models/User.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { DI } from '@/di-symbols.js';

@ -38,16 +37,16 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

-		private metaService: MetaService,
 		private userEntityService: UserEntityService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const meta = await this.metaService.fetch();
-
-			const users = await Promise.all(meta.pinnedUsers.map(acct => Acct.parse(acct)).map(acct => this.usersRepository.findOneBy({
+			const users = await Promise.all(this.serverSettings.pinnedUsers.map(acct => Acct.parse(acct)).map(acct => this.usersRepository.findOneBy({
 				usernameLower: acct.username.toLowerCase(),
 				host: acct.host ?? IsNull(),
 			})));
--- a/packages/backend/src/server/api/endpoints/server-info.ts
+++ b/packages/backend/src/server/api/endpoints/server-info.ts
@ -5,9 +5,10 @@

 import * as os from 'node:os';
 import si from 'systeminformation';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';

 export const meta = {
 	requireCredential: false,
@ -73,10 +74,11 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
 	) {
 		super(meta, paramDef, async () => {
-			if (!(await this.metaService.fetch()).enableServerMachineStats) return {
+			if (!this.serverSettings.enableServerMachineStats) return {
 				machine: '?',
 				cpu: {
 					model: '?',
--- a/packages/backend/src/server/api/endpoints/sw/register.ts
+++ b/packages/backend/src/server/api/endpoints/sw/register.ts
@ -5,9 +5,8 @@

 import { Inject, Injectable } from '@nestjs/common';
 import { IdService } from '@/core/IdService.js';
-import type { SwSubscriptionsRepository } from '@/models/_.js';
+import type { MiMeta, SwSubscriptionsRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DI } from '@/di-symbols.js';
 import { PushNotificationService } from '@/core/PushNotificationService.js';

@ -62,11 +61,13 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.swSubscriptionsRepository)
 		private swSubscriptionsRepository: SwSubscriptionsRepository,

 		private idService: IdService,
-		private metaService: MetaService,
 		private pushNotificationService: PushNotificationService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
@ -78,12 +79,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				publickey: ps.publickey,
 			});

-			const instance = await this.metaService.fetch(true);
-
 			if (exist != null) {
 				return {
 					state: 'already-subscribed' as const,
-					key: instance.swPublicKey,
+					key: this.serverSettings.swPublicKey,
 					userId: me.id,
 					endpoint: exist.endpoint,
 					sendReadMessage: exist.sendReadMessage,
@ -103,7 +102,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 			return {
 				state: 'subscribed' as const,
-				key: instance.swPublicKey,
+				key: this.serverSettings.swPublicKey,
 				userId: me.id,
 				endpoint: ps.endpoint,
 				sendReadMessage: ps.sendReadMessage,
--- a/packages/backend/src/server/api/endpoints/username/available.ts
+++ b/packages/backend/src/server/api/endpoints/username/available.ts
@ -5,11 +5,10 @@

 import { IsNull } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { localUsernameSchema } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
-import { MetaService } from '@/core/MetaService.js';

 export const meta = {
 	tags: ['users'],
@ -39,13 +38,14 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

 		@Inject(DI.usedUsernamesRepository)
 		private usedUsernamesRepository: UsedUsernamesRepository,
-
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const exist = await this.usersRepository.countBy({
@ -55,8 +55,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 			const exist2 = await this.usedUsernamesRepository.countBy({ username: ps.username.toLowerCase() });

-			const meta = await this.metaService.fetch();
-			const isPreserved = meta.preservedUsernames.map(x => x.toLowerCase()).includes(ps.username.toLowerCase());
+			const isPreserved = this.serverSettings.preservedUsernames.map(x => x.toLowerCase()).includes(ps.username.toLowerCase());

 			return {
 				available: exist === 0 && exist2 === 0 && !isPreserved,
--- a/packages/backend/src/server/api/endpoints/users/notes.ts
+++ b/packages/backend/src/server/api/endpoints/users/notes.ts
@ -5,14 +5,13 @@

 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository } from '@/models/_.js';
+import type { MiMeta, NotesRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { DI } from '@/di-symbols.js';
 import { CacheService } from '@/core/CacheService.js';
 import { IdService } from '@/core/IdService.js';
 import { QueryService } from '@/core/QueryService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { FanoutTimelineName } from '@/core/FanoutTimelineService.js';
@ -68,6 +67,9 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

@ -76,15 +78,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private cacheService: CacheService,
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
 			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.gen(ps.sinceDate!) : null);
 			const isSelf = me && (me.id === ps.userId);

-			const serverSettings = await this.metaService.fetch();
-
 			if (ps.withReplies && ps.withFiles) throw new ApiError(meta.errors.bothWithRepliesAndWithFiles);

 			// early return if me is blocked by requesting user
@ -95,7 +94,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				}
 			}

-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
--- a/packages/backend/src/server/api/endpoints/users/translate.ts
+++ b/packages/backend/src/server/api/endpoints/users/translate.ts
@ -5,16 +5,17 @@

 import { URLSearchParams } from 'node:url';
 import fs from 'node:fs';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { translate } from '@vitalets/google-translate-api';
 import { TranslationServiceClient } from '@google-cloud/translate';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { GetterService } from '@/server/api/GetterService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ApiError } from '../../error.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';

 export const meta = {
 	tags: ['users'],
@ -62,8 +63,10 @@ export const paramDef = {
@Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		private getterService: GetterService,
-		private metaService: MetaService,
 		private httpRequestService: HttpRequestService,
 		private roleService: RoleService,
 	) {
@ -82,15 +85,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				return;
 			}

-			const instance = await this.metaService.fetch();
-
 			const translatorServices = [
 				'deepl',
 				'google_no_api',
 				'ctav3',
 			];

-			if (instance.translatorType == null || !translatorServices.includes(instance.translatorType)) {
+			if (this.serverSettings.translatorType == null || !translatorServices.includes(this.serverSettings.translatorType)) {
 				return Promise.resolve(204); // Promise.resolveで204をラップする
 			}

@ -98,12 +99,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			if (targetLang.includes('-')) targetLang = targetLang.split('-')[0];

 			let translationResult;
-			if (instance.translatorType === 'deepl') {
-				if (instance.deeplAuthKey == null) {
+			if (this.serverSettings.translatorType === 'deepl') {
+				if (this.serverSettings.deeplAuthKey == null) {
 					throw new ApiError(meta.errors.unavailable);
 				}
-				translationResult = await this.translateDeepL(target.description, targetLang, instance.deeplAuthKey, instance.deeplIsPro, instance.translatorType);
-			} else if (instance.translatorType === 'google_no_api') {
+				translationResult = await this.translateDeepL(target.description, targetLang, this.serverSettings.deeplAuthKey, this.serverSettings.deeplIsPro, this.serverSettings.translatorType);
+			} else if (this.serverSettings.translatorType === 'google_no_api') {
 				let targetLang = ps.targetLang;
 				if (targetLang.includes('-')) targetLang = targetLang.split('-')[0];

@ -112,14 +113,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				return {
 					sourceLang: raw.src,
 					text: text,
-					translator: instance.translatorType, // 修正点: 配列ではなく単一の文字列
+					translator: this.serverSettings.translatorType, // 修正点: 配列ではなく単一の文字列
 				};
-			} else if (instance.translatorType === 'ctav3') {
-				if (instance.ctav3SaKey == null) return Promise.resolve(204);
-				else if (instance.ctav3ProjectId == null) return Promise.resolve(204);
-				else if (instance.ctav3Location == null) return Promise.resolve(204);
+			} else if (this.serverSettings.translatorType === 'ctav3') {
+				if (this.serverSettings.ctav3SaKey == null) return Promise.resolve(204);
+				else if (this.serverSettings.ctav3ProjectId == null) return Promise.resolve(204);
+				else if (this.serverSettings.ctav3Location == null) return Promise.resolve(204);
 				translationResult = await this.apiCloudTranslationAdvanced(
-					target.description, targetLang, instance.ctav3SaKey, instance.ctav3ProjectId, instance.ctav3Location, instance.ctav3Model, instance.ctav3Glossary, instance.translatorType,
+					target.description, targetLang, this.serverSettings.ctav3SaKey, this.serverSettings.ctav3ProjectId, this.serverSettings.ctav3Location, this.serverSettings.ctav3Model, this.serverSettings.ctav3Glossary, this.serverSettings.translatorType,
 				);
 			} else {
 				throw new Error('Unsupported translator type');
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@ -9,7 +9,7 @@ import { fileURLToPath } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
 import { createBullBoard } from '@bull-board/api';
 import { BullMQAdapter } from '@bull-board/api/bullMQAdapter.js';
-import { FastifyAdapter } from '@bull-board/fastify';
+import { FastifyAdapter as BullBoardFastifyAdapter } from '@bull-board/fastify';
 import ms from 'ms';
 import sharp from 'sharp';
 import pug from 'pug';
@ -24,7 +24,6 @@ import type { Config } from '@/config.js';
 import { getNoteSummary } from '@/misc/get-note-summary.js';
 import { DI } from '@/di-symbols.js';
 import * as Acct from '@/misc/acct.js';
-import { MetaService } from '@/core/MetaService.js';
 import type {
 	DbQueue,
 	DeliverQueue,
@ -73,6 +72,9 @@ export class ClientServerService {
 		@Inject(DI.config)
 		private config: Config,

+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@ -109,7 +111,6 @@ export class ClientServerService {
 		private clipEntityService: ClipEntityService,
 		private channelEntityService: ChannelEntityService,
 		private reversiGameEntityService: ReversiGameEntityService,
-		private metaService: MetaService,
 		private urlPreviewService: UrlPreviewService,
 		private feedService: FeedService,
 		private roleService: RoleService,
@ -129,32 +130,30 @@ export class ClientServerService {

 	@bindThis
 	private async manifestHandler(reply: FastifyReply) {
-		const instance = await this.metaService.fetch(true);
-
 		let manifest = {
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'short_name': instance.shortName || instance.name || this.config.host,
+			'short_name': this.meta.shortName || this.meta.name || this.config.host,
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'name': instance.name || this.config.host,
+			'name': this.meta.name || this.config.host,
 			'start_url': '/',
 			'display': 'standalone',
 			'background_color': '#95e3e8',
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'theme_color': instance.themeColor || '#ffa9c3',
+			'theme_color': this.meta.themeColor || '#ffa9c3',
 			'icons': [{
 				// 空文字列の場合右辺を使いたいため
 				// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-				'src': instance.app192IconUrl || '/static-assets/icons/192.png',
+				'src': this.meta.app192IconUrl || '/static-assets/icons/192.png',
 				'sizes': '192x192',
 				'type': 'image/png',
 				'purpose': 'maskable',
 			}, {
 				// 空文字列の場合右辺を使いたいため
 				// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-				'src': instance.app512IconUrl || '/static-assets/icons/512.png',
+				'src': this.meta.app512IconUrl || '/static-assets/icons/512.png',
 				'sizes': '512x512',
 				'type': 'image/png',
 				'purpose': 'maskable',
@ -178,7 +177,7 @@ export class ClientServerService {

 		manifest = {
 			...manifest,
-			...JSON.parse(instance.manifestJsonOverride === '' ? '{}' : instance.manifestJsonOverride),
+			...JSON.parse(this.meta.manifestJsonOverride === '' ? '{}' : this.meta.manifestJsonOverride),
 		};

 		reply.header('Cache-Control', 'max-age=300');
@ -240,7 +239,7 @@ export class ClientServerService {
 			}
 		});

-		const serverAdapter = new FastifyAdapter();
+		const bullBoardServerAdapter = new BullBoardFastifyAdapter();

 		createBullBoard({
 			queues: [
@ -253,11 +252,11 @@ export class ClientServerService {
 				this.userWebhookDeliverQueue,
 				this.systemWebhookDeliverQueue,
 			].map(q => new BullMQAdapter(q)),
-			serverAdapter,
+			serverAdapter: bullBoardServerAdapter,
 		});

-		serverAdapter.setBasePath(bullBoardPath);
-		(fastify.register as any)(serverAdapter.registerPlugin(), { prefix: bullBoardPath });
+		bullBoardServerAdapter.setBasePath(bullBoardPath);
+		//(fastify.register as any)(bullBoardServerAdapter.registerPlugin(), { prefix: bullBoardPath });
 		//#endregion

 		fastify.register(fastifyView, {
@ -454,9 +453,7 @@ export class ClientServerService {

 		// OpenSearch XML
 		fastify.get('/opensearch.xml', async (request, reply) => {
-			const meta = await this.metaService.fetch();
-
-			const name = meta.name ?? 'CherryPick';
+			const name = this.meta.name ?? 'CherryPick';
 			let content = '';
 			content += '<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">';
 			content += `<ShortName>${name}</ShortName>`;
@ -473,14 +470,13 @@ export class ClientServerService {
 		//#endregion

 		const renderBase = async (reply: FastifyReply, data: { [key: string]: any } = {}) => {
-			const meta = await this.metaService.fetch();
 			reply.header('Cache-Control', 'public, max-age=30');
 			return await reply.view('base', {
-				img: meta.bannerUrl,
+				img: this.meta.bannerUrl,
 				url: this.config.url,
-				title: meta.name ?? 'CherryPick',
-				desc: meta.description,
-				...await this.generateCommonPugData(meta),
+				title: this.meta.name ?? 'CherryPick',
+				desc: this.meta.description,
+				...await this.generateCommonPugData(this.meta),
 				...data,
 			});
 		};
@ -558,7 +554,6 @@ export class ClientServerService {

 			if (user != null) {
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: user.id });
-				const meta = await this.metaService.fetch();
 				const me = profile.fields
 					? profile.fields
 						.filter(filed => filed.value != null && filed.value.match(/^https?:/))
@ -574,7 +569,7 @@ export class ClientServerService {
 					user, profile, me,
 					avatarUrl: user.avatarUrl ?? this.userEntityService.getIdenticonUrl(user),
 					sub: request.params.sub,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				// リモートユーザーなので
@ -612,7 +607,6 @@ export class ClientServerService {
 			if (note) {
 				const _note = await this.noteEntityService.pack(note);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: note.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@ -624,7 +618,7 @@ export class ClientServerService {
 					avatarUrl: _note.user.avatarUrl,
 					// TODO: Let locale changeable by instance setting
 					summary: getNoteSummary(_note),
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -649,7 +643,6 @@ export class ClientServerService {
 			if (page) {
 				const _page = await this.pageEntityService.pack(page);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: page.userId });
-				const meta = await this.metaService.fetch();
 				if (['public'].includes(page.visibility)) {
 					reply.header('Cache-Control', 'public, max-age=15');
 				} else {
@ -663,7 +656,7 @@ export class ClientServerService {
 					page: _page,
 					profile,
 					avatarUrl: _page.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -679,7 +672,6 @@ export class ClientServerService {
 			if (flash) {
 				const _flash = await this.flashEntityService.pack(flash);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: flash.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@ -689,7 +681,7 @@ export class ClientServerService {
 					flash: _flash,
 					profile,
 					avatarUrl: _flash.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -705,7 +697,6 @@ export class ClientServerService {
 			if (clip && clip.isPublic) {
 				const _clip = await this.clipEntityService.pack(clip);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: clip.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@ -715,7 +706,7 @@ export class ClientServerService {
 					clip: _clip,
 					profile,
 					avatarUrl: _clip.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -729,7 +720,6 @@ export class ClientServerService {
 			if (post) {
 				const _post = await this.galleryPostEntityService.pack(post);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: post.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@ -739,7 +729,7 @@ export class ClientServerService {
 					post: _post,
 					profile,
 					avatarUrl: _post.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -754,11 +744,10 @@ export class ClientServerService {

 			if (channel) {
 				const _channel = await this.channelEntityService.pack(channel);
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				return await reply.view('channel', {
 					channel: _channel,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -773,11 +762,10 @@ export class ClientServerService {

 			if (game) {
 				const _game = await this.reversiGameEntityService.packDetail(game);
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=3600');
 				return await reply.view('reversi-game', {
 					game: _game,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@ -798,28 +786,90 @@ export class ClientServerService {
 		//#endregion

 		//#region embed pages
-		fastify.get('/embed/*', async (request, reply) => {
-			const meta = await this.metaService.fetch();
+		fastify.get<{ Params: { user: string; } }>('/embed/user-timeline/:user', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');

+			const user = await this.usersRepository.findOneBy({
+				id: request.params.user,
+			});
+
+			if (user == null) return;
+			if (user.host != null) return;
+
+			const _user = await this.userEntityService.pack(user);
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'CherryPick',
+				...await this.generateCommonPugData(this.meta),
+				embedCtx: htmlSafeJsonStringify({
+					user: _user,
+				}),
+			});
+		});
+
+		fastify.get<{ Params: { note: string; } }>('/embed/notes/:note', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');
+
+			const note = await this.notesRepository.findOneBy({
+				id: request.params.note,
+			});
+
+			if (note == null) return;
+			if (note.visibility !== 'public') return;
+			if (note.userHost != null) return;
+
+			const _note = await this.noteEntityService.pack(note, null, { detail: true });
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'CherryPick',
+				...await this.generateCommonPugData(this.meta),
+				embedCtx: htmlSafeJsonStringify({
+					note: _note,
+				}),
+			});
+		});
+
+		fastify.get<{ Params: { clip: string; } }>('/embed/clips/:clip', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');
+
+			const clip = await this.clipsRepository.findOneBy({
+				id: request.params.clip,
+			});
+
+			if (clip == null) return;
+
+			const _clip = await this.clipEntityService.pack(clip);
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'CherryPick',
+				...await this.generateCommonPugData(this.meta),
+				embedCtx: htmlSafeJsonStringify({
+					clip: _clip,
+				}),
+			});
+		});
+
+		fastify.get('/embed/*', async (request, reply) => {
 			reply.removeHeader('X-Frame-Options');

 			reply.header('Cache-Control', 'public, max-age=3600');
 			return await reply.view('base-embed', {
-				title: meta.name ?? 'CherryPick',
-				...await this.generateCommonPugData(meta),
+				title: this.meta.name ?? 'CherryPick',
+				...await this.generateCommonPugData(this.meta),
 			});
 		});

 		fastify.get('/_info_card_', async (request, reply) => {
-			const meta = await this.metaService.fetch(true);
-
 			reply.removeHeader('X-Frame-Options');

 			return await reply.view('info-card', {
 				version: this.config.version,
 				basedMisskeyVersion: this.config.basedMisskeyVersion,
 				host: this.config.host,
-				meta: meta,
+				meta: this.meta,
 				originalUsersCount: await this.usersRepository.countBy({ host: IsNull() }),
 				originalNotesCount: await this.notesRepository.countBy({ userHost: IsNull() }),
 			});
--- a/packages/backend/src/server/web/UrlPreviewService.ts
+++ b/packages/backend/src/server/web/UrlPreviewService.ts
@ -8,7 +8,6 @@ import { summaly } from '@misskey-dev/summaly';
 import { SummalyResult } from '@misskey-dev/summaly/built/summary.js';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import type Logger from '@/logger.js';
 import { query } from '@/misc/prelude/url.js';
@ -26,7 +25,9 @@ export class UrlPreviewService {
 		@Inject(DI.config)
 		private config: Config,

-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		private httpRequestService: HttpRequestService,
 		private loggerService: LoggerService,
 	) {
@ -62,9 +63,7 @@ export class UrlPreviewService {
 			return;
 		}

-		const meta = await this.metaService.fetch();
-
-		if (!meta.urlPreviewEnabled) {
+		if (!this.meta.urlPreviewEnabled) {
 			reply.code(403);
 			return {
 				error: new ApiError({
@ -75,14 +74,14 @@ export class UrlPreviewService {
 			};
 		}

-		this.logger.info(meta.urlPreviewSummaryProxyUrl
+		this.logger.info(this.meta.urlPreviewSummaryProxyUrl
 			? `(Proxy) Getting preview of ${url}@${lang} ...`
 			: `Getting preview of ${url}@${lang} ...`);

 		try {
-			const summary = meta.urlPreviewSummaryProxyUrl
-				? await this.fetchSummaryFromProxy(url, meta, lang)
-				: await this.fetchSummary(url, meta, lang);
+			const summary = this.meta.urlPreviewSummaryProxyUrl
+				? await this.fetchSummaryFromProxy(url, this.meta, lang)
+				: await this.fetchSummary(url, this.meta, lang);

 			this.logger.succ(`Got preview of ${url}: ${summary.title}`);

--- a/packages/backend/src/server/web/views/base-embed.pug
+++ b/packages/backend/src/server/web/views/base-embed.pug
@ -40,9 +40,12 @@ html(class='embed')
 			var VERSION = "#{version}";
 			var CLIENT_ENTRY = "#{entry.file}";

-		script(type='application/json' id='misskey_meta' data-generated-at=now)
+		script(type='application/json' id='cherrypick_meta' data-generated-at=now)
 			!= metaJson

+		script(type='application/json' id='cherrypick_embedCtx' data-generated-at=now)
+			!= embedCtx
+
 		script
 			include ../boot.embed.js

--- a/packages/backend/src/server/web/views/base.pug
+++ b/packages/backend/src/server/web/views/base.pug
@ -70,7 +70,7 @@ html
 			var VERSION = "#{version}";
 			var CLIENT_ENTRY = "#{entry.file}";

-		script(type='application/json' id='misskey_meta' data-generated-at=now)
+		script(type='application/json' id='cherrypick_meta' data-generated-at=now)
 			!= metaJson

 		script
--- a/Show More
+++ b/Show More