Merge remote-tracking branch 'msky/develop' into enh-be-test-vitest

2026-07-29 23:54:36 +02:00 · 2025-12-04 09:31:07 +09:00
parent ec5ad95bfd 55ef4c5faa
commit dc9c35a8a3
431 changed files with 17853 additions and 10477 deletions
--- a/packages/backend/.swcrc
+++ b/packages/backend/.swcrc
@@ -3,12 +3,17 @@
 	"jsc": {
 		"parser": {
 			"syntax": "typescript",
+			"jsx": true,
 			"dynamicImport": true,
 			"decorators": true
 		},
 		"transform": {
 			"legacyDecorator": true,
-			"decoratorMetadata": true
+			"decoratorMetadata": true,
+			"react": {
+				"runtime": "automatic",
+				"importSource": "@kitajs/html"
+			}
 		},
 		"experimental": {
 			"keepImportAssertions": true
--- a/packages/backend/src/server/web/bios.css
+++ b/packages/backend/src/server/web/bios.css
--- a/packages/backend/src/server/web/bios.js
+++ b/packages/backend/src/server/web/bios.js
--- a/packages/backend/src/server/web/cli.css
+++ b/packages/backend/src/server/web/cli.css
--- a/packages/backend/src/server/web/cli.js
+++ b/packages/backend/src/server/web/cli.js
--- a/packages/backend/src/server/web/error.css
+++ b/packages/backend/src/server/web/error.css
--- a/packages/backend/src/server/web/error.js
+++ b/packages/backend/src/server/web/error.js
--- a/packages/backend/assets/misc/flush.js
+++ b/packages/backend/assets/misc/flush.js
@@ -0,0 +1,46 @@
+(async () => {
+	const msg = document.getElementById('msg');
+	const successText = `\nSuccess Flush! <a href="/">Back to Misskey</a>\n成功しました。<a href="/">Misskeyを開き直してください。</a>`;
+
+	if (!document.cookie) {
+		message('Your site data is fully cleared by your browser.');
+		message(successText);
+	} else {
+		message('Your browser does not support Clear-Site-Data header. Start opportunistic flushing.');
+		try {
+			localStorage.clear();
+			message('localStorage cleared.');
+
+			const idbPromises = ['MisskeyClient', 'keyval-store'].map((name, i, arr) => new Promise((res, rej) => {
+				const delidb = indexedDB.deleteDatabase(name);
+				delidb.onsuccess = () => res(message(`indexedDB "${name}" cleared. (${i + 1}/${arr.length})`));
+				delidb.onerror = e => rej(e)
+			}));
+
+			await Promise.all(idbPromises);
+
+			if (navigator.serviceWorker.controller) {
+				navigator.serviceWorker.controller.postMessage('clear');
+				await navigator.serviceWorker.getRegistrations()
+					.then(registrations => {
+						return Promise.all(registrations.map(registration => registration.unregister()));
+					})
+					.catch(e => { throw new Error(e) });
+			}
+
+			message(successText);
+		} catch (e) {
+			message(`\n${e}\n\nFlush Failed. <a href="/flush">Please retry.</a>\n失敗しました。<a href="/flush">もう一度試してみてください。</a>`);
+			message(`\nIf you retry more than 3 times, try manually clearing the browser cache or contact to instance admin.\n3回以上試しても失敗する場合、ブラウザのキャッシュを手動で消去し、それでもだめならインスタンス管理者に連絡してみてください。\n`)
+
+			console.error(e);
+			setTimeout(() => {
+				location = '/';
+			}, 10000)
+		}
+	}
+
+	function message(text) {
+		msg.insertAdjacentHTML('beforeend', `<p>[${(new Date()).toString()}] ${text.replace(/\n/g,'<br>')}</p>`)
+	}
+})();
--- a/packages/backend/assets/misc/info-card.css
+++ b/packages/backend/assets/misc/info-card.css
@@ -0,0 +1,35 @@
+html,
+body {
+	margin: 0;
+	padding: 0;
+	min-height: 100vh;
+	background: #fff;
+}
+
+#a {
+	display: block;
+}
+
+#banner {
+	background-size: cover;
+	background-position: center center;
+}
+
+#title {
+	display: inline-block;
+	margin: 24px;
+	padding: 0.5em 0.8em;
+	color: #fff;
+	background: rgba(0, 0, 0, 0.5);
+	font-weight: bold;
+	font-size: 1.3em;
+}
+
+#content {
+	overflow: auto;
+	color: #353c3e;
+}
+
+#description {
+	margin: 24px;
+}
--- a/packages/backend/jsconfig.json
+++ b/packages/backend/jsconfig.json
@@ -1,13 +0,0 @@
-{
-	"compilerOptions": {
-		"target": "es6",
-		"module": "commonjs",
-		"allowSyntheticDefaultImports": true
-	},
-	"exclude": [
-		"node_modules",
-		"jspm_packages",
-		"tmp",
-		"temp"
-	]
-}
--- a/packages/backend/migration/1761569941833-add-channel-muting.js
+++ b/packages/backend/migration/1761569941833-add-channel-muting.js
@@ -0,0 +1,38 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class AddChannelMuting1761569941833 {
+    name = 'AddChannelMuting1761569941833'
+
+    /**
+     * @param {QueryRunner} queryRunner
+     */
+    async up(queryRunner) {
+        await queryRunner.query(`CREATE TABLE "channel_muting" ("id" character varying(32) NOT NULL, "userId" character varying(32) NOT NULL, "channelId" character varying(32) NOT NULL, "expiresAt" TIMESTAMP WITH TIME ZONE, CONSTRAINT "PK_aec842e98f332ebd8e12f85bad6" PRIMARY KEY ("id"))`);
+        await queryRunner.query(`CREATE INDEX "IDX_34415e3062ae7a94617496e81c" ON "channel_muting" ("userId") `);
+        await queryRunner.query(`CREATE INDEX "IDX_4d534d7177fc59879d942e96d0" ON "channel_muting" ("channelId") `);
+        await queryRunner.query(`CREATE INDEX "IDX_6dd314e96806b7df65ddadff72" ON "channel_muting" ("expiresAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_b96870ed326ccc7fa243970965" ON "channel_muting" ("userId", "channelId") `);
+        await queryRunner.query(`ALTER TABLE "note" ADD "renoteChannelId" character varying(32)`);
+        await queryRunner.query(`COMMENT ON COLUMN "note"."renoteChannelId" IS '[Denormalized]'`);
+        await queryRunner.query(`ALTER TABLE "channel_muting" ADD CONSTRAINT "FK_34415e3062ae7a94617496e81c5" FOREIGN KEY ("userId") REFERENCES "user"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+        await queryRunner.query(`ALTER TABLE "channel_muting" ADD CONSTRAINT "FK_4d534d7177fc59879d942e96d03" FOREIGN KEY ("channelId") REFERENCES "channel"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+    }
+
+    /**
+     * @param {QueryRunner} queryRunner
+     */
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "channel_muting" DROP CONSTRAINT "FK_4d534d7177fc59879d942e96d03"`);
+        await queryRunner.query(`ALTER TABLE "channel_muting" DROP CONSTRAINT "FK_34415e3062ae7a94617496e81c5"`);
+        await queryRunner.query(`COMMENT ON COLUMN "note"."renoteChannelId" IS '[Denormalized]'`);
+        await queryRunner.query(`ALTER TABLE "note" DROP COLUMN "renoteChannelId"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_b96870ed326ccc7fa243970965"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_6dd314e96806b7df65ddadff72"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_4d534d7177fc59879d942e96d0"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_34415e3062ae7a94617496e81c"`);
+        await queryRunner.query(`DROP TABLE "channel_muting"`);
+    }
+}
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -7,43 +7,45 @@
 		"node": "^22.15.0 || ^24.10.0"
 	},
 	"scripts": {
-		"start": "node ./built/boot/entry.js",
-		"start:test": "cross-env NODE_ENV=test node ./built/boot/entry.js",
-		"migrate": "pnpm typeorm migration:run -d ormconfig.js",
-		"revert": "pnpm typeorm migration:revert -d ormconfig.js",
-		"cli": "node ./built/boot/cli.js",
-		"check:connect": "node ./scripts/check_connect.js",
+		"start": "pnpm convert:config && node ./built/boot/entry.js",
+		"start:inspect": "pnpm convert:config && node --inspect ./built/boot/entry.js",
+		"start:test": "pnpm convert:config && cross-env NODE_ENV=test node ./built/boot/entry.js",
+		"migrate": "pnpm convert:config && pnpm typeorm migration:run -d ormconfig.js",
+		"revert": "pnpm convert:config && pnpm typeorm migration:revert -d ormconfig.js",
+		"cli": "pnpm convert:config && node ./built/boot/cli.js",
+		"check:connect": "pnpm convert:config && node ./scripts/check_connect.js",
+		"convert:config": "node ./scripts/convert_config.js",
 		"build": "swc src -d built -D --strip-leading-paths",
 		"build:test": "swc test-server -d built-test -D --config-file test-server/.swcrc --strip-leading-paths",
 		"watch:swc": "swc src -d built -D -w --strip-leading-paths",
 		"build:tsc": "tsc -p tsconfig.json && tsc-alias -p tsconfig.json",
-		"watch": "node ./scripts/watch.mjs",
+		"watch": "pnpm convert:config && node ./scripts/watch.mjs",
 		"restart": "pnpm build && pnpm start",
-		"dev": "node ./scripts/dev.mjs",
+		"dev": "pnpm convert:config && node ./scripts/dev.mjs",
 		"typecheck": "tsc --noEmit && tsc -p test --noEmit && tsc -p test-federation --noEmit",
 		"eslint": "eslint --quiet \"{src,test-federation}/**/*.ts\"",
 		"lint": "pnpm typecheck && pnpm eslint",
-		"test": "vitest --config vitest.config.unit.ts",
-		"test:e2e": "vitest --config vitest.config.e2e.ts",
-		"test:fed": "vitest --config vitest.config.fed.ts",
-		"test-and-coverage": "vitest --coverage --config vitest.config.unit.ts",
-		"test-and-coverage:e2e": "vitest --coverage --config vitest.config.e2e.ts",
+		"test": "pnpm convert:config && vitest --config vitest.config.unit.ts",
+		"test:e2e": "pnpm convert:config && vitest --config vitest.config.e2e.ts",
+		"test:fed": "pnpm convert:config && vitest --config vitest.config.fed.ts",
+		"test-and-coverage": "pnpm convert:config && vitest --coverage --config vitest.config.unit.ts",
+		"test-and-coverage:e2e": "pnpm convert:config && vitest --coverage --config vitest.config.e2e.ts",
 		"check-migrations": "node scripts/check_migrations_clean.js",
-		"generate-api-json": "node ./scripts/generate_api_json.js"
+		"generate-api-json": "pnpm convert:config && node ./scripts/generate_api_json.js"
 	},
 	"optionalDependencies": {
 		"@swc/core-android-arm64": "1.3.11",
-		"@swc/core-darwin-arm64": "1.13.20",
-		"@swc/core-darwin-x64": "1.13.20",
+		"@swc/core-darwin-arm64": "1.15.3",
+		"@swc/core-darwin-x64": "1.15.3",
 		"@swc/core-freebsd-x64": "1.3.11",
-		"@swc/core-linux-arm-gnueabihf": "1.13.20",
-		"@swc/core-linux-arm64-gnu": "1.13.20",
-		"@swc/core-linux-arm64-musl": "1.13.20",
-		"@swc/core-linux-x64-gnu": "1.13.20",
-		"@swc/core-linux-x64-musl": "1.13.20",
-		"@swc/core-win32-arm64-msvc": "1.13.20",
-		"@swc/core-win32-ia32-msvc": "1.13.20",
-		"@swc/core-win32-x64-msvc": "1.13.20",
+		"@swc/core-linux-arm-gnueabihf": "1.15.3",
+		"@swc/core-linux-arm64-gnu": "1.15.3",
+		"@swc/core-linux-arm64-musl": "1.15.3",
+		"@swc/core-linux-x64-gnu": "1.15.3",
+		"@swc/core-linux-x64-musl": "1.15.3",
+		"@swc/core-win32-arm64-msvc": "1.15.3",
+		"@swc/core-win32-ia32-msvc": "1.15.3",
+		"@swc/core-win32-x64-msvc": "1.15.3",
 		"@tensorflow/tfjs": "4.22.0",
 		"@tensorflow/tfjs-node": "4.22.0",
 		"bufferutil": "4.0.9",
@@ -63,107 +65,100 @@
 		"utf-8-validate": "6.0.5"
 	},
 	"dependencies": {
-		"@aws-sdk/client-s3": "3.908.0",
-		"@aws-sdk/lib-storage": "3.908.0",
+		"@aws-sdk/client-s3": "3.937.0",
+		"@aws-sdk/lib-storage": "3.937.0",
 		"@discordapp/twemoji": "16.0.1",
 		"@fastify/accepts": "5.0.3",
 		"@fastify/cookie": "11.0.2",
-		"@fastify/cors": "10.1.0",
+		"@fastify/cors": "11.1.0",
 		"@fastify/express": "4.0.2",
-		"@fastify/http-proxy": "10.0.2",
-		"@fastify/multipart": "9.2.1",
-		"@fastify/static": "8.2.0",
-		"@fastify/view": "10.0.2",
+		"@fastify/http-proxy": "11.3.0",
+		"@fastify/multipart": "9.3.0",
+		"@fastify/static": "8.3.0",
+		"@kitajs/html": "4.2.11",
 		"@misskey-dev/sharp-read-bmp": "1.2.0",
-		"@misskey-dev/summaly": "5.2.4",
-		"@napi-rs/canvas": "0.1.80",
-		"@nestjs/common": "11.1.6",
-		"@nestjs/core": "11.1.6",
-		"@nestjs/testing": "11.1.6",
+		"@misskey-dev/summaly": "5.2.5",
+		"@napi-rs/canvas": "0.1.82",
+		"@nestjs/common": "11.1.9",
+		"@nestjs/core": "11.1.9",
+		"@nestjs/testing": "11.1.9",
 		"@peertube/http-signature": "1.7.0",
-		"@sentry/node": "10.20.0",
-		"@sentry/profiling-node": "10.20.0",
-		"@simplewebauthn/server": "12.0.0",
+		"@sentry/node": "10.26.0",
+		"@sentry/profiling-node": "10.26.0",
+		"@simplewebauthn/server": "13.2.2",
 		"@sinonjs/fake-timers": "15.0.0",
-		"@smithy/node-http-handler": "2.5.0",
-		"@swc/cli": "0.7.8",
-		"@swc/core": "1.13.5",
+		"@smithy/node-http-handler": "4.4.5",
+		"@swc/cli": "0.7.9",
+		"@swc/core": "1.15.3",
 		"@twemoji/parser": "16.0.0",
 		"@types/redis-info": "3.0.3",
 		"accepts": "1.3.8",
 		"ajv": "8.17.1",
 		"archiver": "7.0.1",
 		"async-mutex": "0.5.0",
-		"bcryptjs": "2.4.3",
+		"bcryptjs": "3.0.3",
 		"blurhash": "2.0.5",
-		"body-parser": "1.20.3",
-		"bullmq": "5.61.0",
+		"body-parser": "2.2.0",
+		"bullmq": "5.64.1",
 		"cacheable-lookup": "7.0.0",
-		"cbor": "9.0.2",
+		"cbor": "10.0.11",
 		"chalk": "5.6.2",
 		"chalk-template": "1.1.2",
 		"chokidar": "4.0.3",
-		"cli-highlight": "2.1.11",
-		"color-convert": "2.0.1",
-		"content-disposition": "0.5.4",
-		"date-fns": "2.30.0",
+		"color-convert": "3.1.3",
+		"content-disposition": "1.0.1",
+		"date-fns": "4.1.0",
 		"deep-email-validator": "0.1.21",
-		"fastify": "5.6.1",
+		"fastify": "5.6.2",
 		"fastify-raw-body": "5.0.0",
-		"feed": "4.2.2",
-		"file-type": "21.0.0",
+		"feed": "5.1.0",
+		"file-type": "21.1.1",
 		"fluent-ffmpeg": "2.1.3",
-		"form-data": "4.0.4",
-		"got": "14.5.0",
-		"happy-dom": "20.0.7",
+		"form-data": "4.0.5",
+		"got": "14.6.4",
 		"hpagent": "1.2.0",
-		"htmlescape": "1.1.1",
 		"http-link-header": "1.1.3",
-		"ioredis": "5.8.1",
+		"i18n": "workspace:*",
+		"ioredis": "5.8.2",
 		"ip-cidr": "4.0.2",
 		"ipaddr.js": "2.2.0",
-		"is-svg": "5.1.0",
-		"js-yaml": "4.1.0",
-		"jsdom": "26.1.0",
+		"is-svg": "6.1.0",
 		"json5": "2.2.3",
-		"jsonld": "8.3.3",
+		"jsonld": "9.0.0",
 		"jsrsasign": "11.1.0",
 		"juice": "11.0.3",
-		"meilisearch": "0.53.0",
+		"meilisearch": "0.54.0",
 		"mfm-js": "0.25.0",
-		"microformats-parser": "2.0.4",
-		"mime-types": "2.1.35",
+		"mime-types": "3.0.2",
 		"misskey-js": "workspace:*",
 		"misskey-reversi": "workspace:*",
 		"ms": "3.0.0-canary.202508261828",
 		"nanoid": "5.1.6",
 		"nested-property": "4.0.0",
 		"node-fetch": "3.3.2",
-		"nodemailer": "7.0.9",
+		"node-html-parser": "7.0.1",
+		"nodemailer": "7.0.10",
 		"nsfwjs": "4.2.0",
 		"oauth": "0.10.2",
 		"oauth2orize": "1.12.0",
 		"oauth2orize-pkce": "0.1.2",
 		"os-utils": "0.0.14",
 		"otpauth": "9.4.1",
-		"parse5": "7.3.0",
 		"pg": "8.16.3",
-		"pkce-challenge": "4.1.0",
+		"pkce-challenge": "5.0.0",
 		"probe-image-size": "7.2.3",
 		"promise-limit": "2.7.0",
-		"pug": "3.0.3",
 		"qrcode": "1.5.4",
 		"random-seed": "0.3.0",
 		"ratelimiter": "3.4.1",
-		"re2": "1.22.1",
+		"re2": "1.22.3",
 		"redis-info": "3.1.0",
-		"redis-lock": "0.1.4",
 		"reflect-metadata": "0.2.2",
 		"rename": "1.0.4",
 		"rss-parser": "3.13.0",
 		"rxjs": "7.8.2",
 		"sanitize-html": "2.17.0",
-		"secure-json-parse": "3.0.2",
+		"secure-json-parse": "4.1.0",
 		"semver": "7.7.3",
 		"sharp": "0.33.5",
 		"slacc": "0.0.10",
@@ -176,66 +171,66 @@
 		"tsconfig-paths": "4.2.0",
 		"typeorm": "0.3.27",
 		"typescript": "5.9.3",
-		"ulid": "2.4.0",
+		"ulid": "3.0.1",
 		"vary": "1.1.2",
 		"web-push": "3.6.7",
 		"ws": "8.18.3",
 		"xev": "3.0.2"
 	},
 	"devDependencies": {
-		"@nestjs/platform-express": "10.4.20",
-		"@sentry/vue": "10.20.0",
+		"@kitajs/ts-html-plugin": "4.1.3",
+		"@nestjs/platform-express": "11.1.9",
+		"@sentry/vue": "10.26.0",
 		"@simplewebauthn/types": "12.0.0",
 		"@types/accepts": "1.3.7",
-		"@types/archiver": "6.0.3",
-		"@types/bcryptjs": "2.4.6",
+		"@types/archiver": "7.0.0",
 		"@types/body-parser": "1.19.6",
 		"@types/color-convert": "2.0.4",
 		"@types/content-disposition": "0.5.9",
-		"@types/fluent-ffmpeg": "2.1.27",
-		"@types/htmlescape": "1.1.3",
+		"@types/fluent-ffmpeg": "2.1.28",
 		"@types/http-link-header": "1.0.7",
 		"@types/js-yaml": "4.0.9",
-		"@types/jsdom": "21.1.7",
 		"@types/jsonld": "1.5.15",
 		"@types/jsrsasign": "10.5.15",
-		"@types/mime-types": "2.1.4",
-		"@types/ms": "0.7.34",
-		"@types/node": "22.18.10",
-		"@types/nodemailer": "6.4.20",
+		"@types/mime-types": "3.0.1",
+		"@types/ms": "2.1.0",
+		"@types/node": "24.10.1",
+		"@types/nodemailer": "7.0.4",
 		"@types/oauth": "0.9.6",
 		"@types/oauth2orize": "1.11.5",
 		"@types/oauth2orize-pkce": "0.1.2",
-		"@types/pg": "8.15.5",
-		"@types/pug": "2.0.10",
-		"@types/qrcode": "1.5.5",
+		"@types/pg": "8.15.6",
+		"@types/qrcode": "1.5.6",
 		"@types/random-seed": "0.3.5",
 		"@types/ratelimiter": "3.4.6",
 		"@types/rename": "1.0.7",
 		"@types/sanitize-html": "2.16.0",
 		"@types/semver": "7.7.1",
 		"@types/simple-oauth2": "5.0.7",
-		"@types/sinonjs__fake-timers": "8.1.5",
+		"@types/sinonjs__fake-timers": "15.0.1",
 		"@types/supertest": "6.0.3",
 		"@types/tinycolor2": "1.4.6",
 		"@types/tmp": "0.2.6",
 		"@types/vary": "1.1.3",
 		"@types/web-push": "3.6.4",
 		"@types/ws": "8.18.1",
-		"@typescript-eslint/eslint-plugin": "8.46.1",
-		"@typescript-eslint/parser": "8.46.1",
-		"@vitest/coverage-v8": "3.2.4",
+		"@typescript-eslint/eslint-plugin": "8.47.0",
+		"@typescript-eslint/parser": "8.47.0",
+		"@vitest/coverage-v8": "4.0.13",
 		"aws-sdk-client-mock": "4.1.0",
-		"cross-env": "7.0.3",
+		"cross-env": "10.1.0",
 		"eslint-plugin-import": "2.32.0",
-		"execa": "8.0.1",
-		"fkill": "9.0.0",
+		"execa": "9.6.0",
+		"fkill": "10.0.1",
 		"jest-mock": "29.7.0",
-		"nodemon": "3.1.10",
-		"pid-port": "1.0.2",
+		"jest-util": "29.7.0",
+		"js-yaml": "4.1.1",
+		"nodemon": "3.1.11",
+		"pid-port": "2.0.0",
 		"simple-oauth2": "5.1.0",
 		"supertest": "7.1.4",
 		"unplugin-swc": "1.5.8",
-		"vitest": "3.2.4"
+		"vitest": "4.0.13",
+		"vite": "7.2.4"
 	}
 }
--- a/packages/backend/scripts/convert_config.js
+++ b/packages/backend/scripts/convert_config.js
@@ -0,0 +1,59 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * YAMLファイルをJSONファイルに変換するスクリプト
+ * ビルド前に実行し、ランタイムにjs-yamlを含まないようにする
+ */
+
+import fs from 'node:fs';
+import { resolve, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import yaml from 'js-yaml';
+
+const _filename = fileURLToPath(import.meta.url);
+const _dirname = dirname(_filename);
+
+const configDir = resolve(_dirname, '../../../.config');
+
+/**
+ * YAMLファイルをJSONファイルに変換
+ * @param {string} ymlPath - YAMLファイルのパス
+ * @param {string} jsonPath - JSONファイルの出力パス
+ */
+function convertYamlToJson(ymlPath, jsonPath) {
+	if (!fs.existsSync(ymlPath)) {
+		console.log(`skipped: ${ymlPath} is not found`);
+		return;
+	}
+
+	const yamlContent = fs.readFileSync(ymlPath, 'utf-8');
+	const jsonContent = yaml.load(yamlContent);
+	fs.writeFileSync(jsonPath, JSON.stringify({
+		'_NOTE_': 'This file is auto-generated from YAML file. DO NOT EDIT.',
+		...jsonContent,
+	}), 'utf-8');
+	console.log(`✓ ${ymlPath} → ${jsonPath}`);
+}
+
+// default.yml と test.yml を変換
+convertYamlToJson(
+	resolve(configDir, 'default.yml'),
+	resolve(configDir, 'default.json'),
+);
+
+convertYamlToJson(
+	resolve(configDir, 'test.yml'),
+	resolve(configDir, 'test.json'),
+);
+
+// MISSKEY_CONFIG_YML 環境変数が指定されている場合も変換
+if (process.env.MISSKEY_CONFIG_YML) {
+	const customYmlPath = resolve(configDir, process.env.MISSKEY_CONFIG_YML);
+	const customJsonPath = customYmlPath.replace(/\.ya?ml$/i, '.json');
+	convertYamlToJson(customYmlPath, customJsonPath);
+}
+
+console.log('Configuration compiled');
--- a/packages/backend/scripts/dev.mjs
+++ b/packages/backend/scripts/dev.mjs
@@ -42,7 +42,7 @@ async function killProc() {
 		'./node_modules/nodemon/bin/nodemon.js',
 		[
 			'-w', 'src',
-			'-e', 'ts,js,mjs,cjs,json,pug',
+			'-e', 'ts,js,mjs,cjs,tsx,json,pug',
 			'--exec', 'pnpm', 'run', 'build',
 		],
 		{
--- a/packages/backend/scripts/measure-memory.mjs
+++ b/packages/backend/scripts/measure-memory.mjs
@@ -0,0 +1,152 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * This script starts the Misskey backend server, waits for it to be ready,
+ * measures memory usage, and outputs the result as JSON.
+ *
+ * Usage: node scripts/measure-memory.mjs
+ */
+
+import { fork } from 'node:child_process';
+import { setTimeout } from 'node:timers/promises';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const STARTUP_TIMEOUT = 120000; // 120 seconds timeout for server startup
+const MEMORY_SETTLE_TIME = 10000; // Wait 10 seconds after startup for memory to settle
+
+async function measureMemory() {
+	const startTime = Date.now();
+
+	// Start the Misskey backend server using fork to enable IPC
+	const serverProcess = fork(join(__dirname, '../built/boot/entry.js'), [], {
+		cwd: join(__dirname, '..'),
+		env: {
+			...process.env,
+			NODE_ENV: 'test',
+		},
+		stdio: ['pipe', 'pipe', 'pipe', 'ipc'],
+	});
+
+	let serverReady = false;
+
+	// Listen for the 'ok' message from the server indicating it's ready
+	serverProcess.on('message', (message) => {
+		if (message === 'ok') {
+			serverReady = true;
+		}
+	});
+
+	// Handle server output
+	serverProcess.stdout?.on('data', (data) => {
+		process.stderr.write(`[server stdout] ${data}`);
+	});
+
+	serverProcess.stderr?.on('data', (data) => {
+		process.stderr.write(`[server stderr] ${data}`);
+	});
+
+	// Handle server error
+	serverProcess.on('error', (err) => {
+		process.stderr.write(`[server error] ${err}\n`);
+	});
+
+	// Wait for server to be ready or timeout
+	const startupStartTime = Date.now();
+	while (!serverReady) {
+		if (Date.now() - startupStartTime > STARTUP_TIMEOUT) {
+			serverProcess.kill('SIGTERM');
+			throw new Error('Server startup timeout');
+		}
+		await setTimeout(100);
+	}
+
+	const startupTime = Date.now() - startupStartTime;
+	process.stderr.write(`Server started in ${startupTime}ms\n`);
+
+	// Wait for memory to settle
+	await setTimeout(MEMORY_SETTLE_TIME);
+
+	// Get memory usage from the server process via /proc
+	const pid = serverProcess.pid;
+	let memoryInfo;
+
+	try {
+		const fs = await import('node:fs/promises');
+
+		// Read /proc/[pid]/status for detailed memory info
+		const status = await fs.readFile(`/proc/${pid}/status`, 'utf-8');
+		const vmRssMatch = status.match(/VmRSS:\s+(\d+)\s+kB/);
+		const vmDataMatch = status.match(/VmData:\s+(\d+)\s+kB/);
+		const vmSizeMatch = status.match(/VmSize:\s+(\d+)\s+kB/);
+
+		memoryInfo = {
+			rss: vmRssMatch ? parseInt(vmRssMatch[1], 10) * 1024 : null,
+			heapUsed: vmDataMatch ? parseInt(vmDataMatch[1], 10) * 1024 : null,
+			vmSize: vmSizeMatch ? parseInt(vmSizeMatch[1], 10) * 1024 : null,
+		};
+	} catch (err) {
+		// Fallback: use ps command
+		process.stderr.write(`Warning: Could not read /proc/${pid}/status: ${err}\n`);
+
+		const { execSync } = await import('node:child_process');
+		try {
+			const ps = execSync(`ps -o rss= -p ${pid}`, { encoding: 'utf-8' });
+			const rssKb = parseInt(ps.trim(), 10);
+			memoryInfo = {
+				rss: rssKb * 1024,
+				heapUsed: null,
+				vmSize: null,
+			};
+		} catch {
+			memoryInfo = {
+				rss: null,
+				heapUsed: null,
+				vmSize: null,
+				error: 'Could not measure memory',
+			};
+		}
+	}
+
+	// Stop the server
+	serverProcess.kill('SIGTERM');
+
+	// Wait for process to exit
+	let exited = false;
+	await new Promise((resolve) => {
+		serverProcess.on('exit', () => {
+			exited = true;
+			resolve(undefined);
+		});
+		// Force kill after 10 seconds if not exited
+		setTimeout(10000).then(() => {
+			if (!exited) {
+				serverProcess.kill('SIGKILL');
+			}
+			resolve(undefined);
+		});
+	});
+
+	const result = {
+		timestamp: new Date().toISOString(),
+		startupTimeMs: startupTime,
+		memory: memoryInfo,
+	};
+
+	// Output as JSON to stdout
+	console.log(JSON.stringify(result, null, 2));
+}
+
+measureMemory().catch((err) => {
+	console.error(JSON.stringify({
+		error: err.message,
+		timestamp: new Date().toISOString(),
+	}));
+	process.exit(1);
+});
--- a/packages/backend/src/@types/redis-lock.d.ts
+++ b/packages/backend/src/@types/redis-lock.d.ts
@@ -1,13 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-declare module 'redis-lock' {
-	import type Redis from 'ioredis';
-
-	type Lock = (lockName: string, timeout?: number, taskToPerform?: () => Promise<void>) => void;
-	function redisLock(client: Redis.Redis, retryDelay: number): Lock;
-
-	export = redisLock;
-}
--- a/packages/backend/src/boot/master.ts
+++ b/packages/backend/src/boot/master.ts
@@ -10,8 +10,6 @@ import * as os from 'node:os';
 import cluster from 'node:cluster';
 import chalk from 'chalk';
 import chalkTemplate from 'chalk-template';
-import * as Sentry from '@sentry/node';
-import { nodeProfilingIntegration } from '@sentry/profiling-node';
 import Logger from '@/logger.js';
 import { loadConfig } from '@/config.js';
 import type { Config } from '@/config.js';
@@ -41,7 +39,7 @@ function greet() {
 		//#endregion

 		console.log(' Misskey is an open-source decentralized microblogging platform.');
-		console.log(chalk.rgb(255, 136, 0)(' If you like Misskey, please donate to support development. https://www.patreon.com/syuilo'));
+		console.log(chalk.rgb(255, 136, 0)(' If you like Misskey, please consider donating to support dev. https://misskey-hub.net/docs/donate/'));

 		console.log('');
 		console.log(chalkTemplate`--- ${os.hostname()} {gray (PID: ${process.pid.toString()})} ---`);
@@ -74,6 +72,9 @@ export async function masterMain() {
 	bootLogger.succ('Misskey initialized');

 	if (config.sentryForBackend) {
+		const Sentry = await import('@sentry/node');
+		const { nodeProfilingIntegration } = await import('@sentry/profiling-node');
+
 		Sentry.init({
 			integrations: [
 				...(config.sentryForBackend.enableNodeProfiling ? [nodeProfilingIntegration()] : []),
--- a/packages/backend/src/boot/worker.ts
+++ b/packages/backend/src/boot/worker.ts
@@ -4,8 +4,6 @@
 */

 import cluster from 'node:cluster';
-import * as Sentry from '@sentry/node';
-import { nodeProfilingIntegration } from '@sentry/profiling-node';
 import { envOption } from '@/env.js';
 import { loadConfig } from '@/config.js';
 import { jobQueue, server } from './common.js';
@@ -17,6 +15,9 @@ export async function workerMain() {
 	const config = loadConfig();

 	if (config.sentryForBackend) {
+		const Sentry = await import('@sentry/node');
+		const { nodeProfilingIntegration } = await import('@sentry/profiling-node');
+
 		Sentry.init({
 			integrations: [
 				...(config.sentryForBackend.enableNodeProfiling ? [nodeProfilingIntegration()] : []),
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -6,11 +6,11 @@
 import * as fs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname, resolve } from 'node:path';
-import * as yaml from 'js-yaml';
 import { type FastifyServerOptions } from 'fastify';
 import type * as Sentry from '@sentry/node';
 import type * as SentryVue from '@sentry/vue';
 import type { RedisOptions } from 'ioredis';
+import type { ManifestChunk } from 'vite';

 type RedisOptionsSource = Partial<RedisOptions> & {
 	host: string;
@@ -187,9 +187,9 @@ export type Config = {
 	authUrl: string;
 	driveUrl: string;
 	userAgent: string;
-	frontendEntry: { file: string | null };
+	frontendEntry: ManifestChunk;
 	frontendManifestExists: boolean;
-	frontendEmbedEntry: { file: string | null };
+	frontendEmbedEntry: ManifestChunk;
 	frontendEmbedManifestExists: boolean;
 	mediaProxy: string;
 	externalMediaProxyEnabled: boolean;
@@ -226,10 +226,10 @@ const dir = `${_dirname}/../../../.config`;
 * Path of configuration file
 */
 export const path = process.env.MISSKEY_CONFIG_YML
-	? resolve(dir, process.env.MISSKEY_CONFIG_YML)
+	? resolve(dir, process.env.MISSKEY_CONFIG_YML).replace(/\.ya?ml$/i, '.json')
 	: process.env.NODE_ENV === 'test'
-		? resolve(dir, 'test.yml')
-		: resolve(dir, 'default.yml');
+		? resolve(dir, 'test.json')
+		: resolve(dir, 'default.json');

 export function loadConfig(): Config {
 	const meta = JSON.parse(fs.readFileSync(`${_dirname}/../../../built/meta.json`, 'utf-8'));
@@ -243,7 +243,7 @@ export function loadConfig(): Config {
 		JSON.parse(fs.readFileSync(`${_dirname}/../../../built/_frontend_embed_vite_/manifest.json`, 'utf-8'))
 		: { 'src/boot.ts': { file: null } };

-	const config = yaml.load(fs.readFileSync(path, 'utf-8')) as Source;
+	const config = JSON.parse(fs.readFileSync(path, 'utf-8')) as Source;

 	const url = tryCreateUrl(config.url ?? process.env.MISSKEY_URL ?? '');
 	const version = meta.version;
--- a/packages/backend/src/core/AiService.ts
+++ b/packages/backend/src/core/AiService.ts
@@ -7,11 +7,11 @@ import * as fs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname } from 'node:path';
 import { Injectable } from '@nestjs/common';
-import * as nsfw from 'nsfwjs';
 import si from 'systeminformation';
 import { Mutex } from 'async-mutex';
 import fetch from 'node-fetch';
 import { bindThis } from '@/decorators.js';
+import type { NSFWJS, PredictionType } from 'nsfwjs';

 const _filename = fileURLToPath(import.meta.url);
 const _dirname = dirname(_filename);
@@ -21,7 +21,7 @@ let isSupportedCpu: undefined | boolean = undefined;

@Injectable()
 export class AiService {
-	private model: nsfw.NSFWJS;
+	private model: NSFWJS;
 	private modelLoadMutex: Mutex = new Mutex();

 	constructor(
@@ -29,7 +29,7 @@ export class AiService {
 	}

 	@bindThis
-	public async detectSensitive(source: string | Buffer): Promise<nsfw.PredictionType[] | null> {
+	public async detectSensitive(source: string | Buffer): Promise<PredictionType[] | null> {
 		try {
 			if (isSupportedCpu === undefined) {
 				isSupportedCpu = await this.computeIsSupportedCpu();
@@ -44,6 +44,7 @@ export class AiService {
 			tf.env().global.fetch = fetch;

 			if (this.model == null) {
+				const nsfw = await import('nsfwjs');
 				await this.modelLoadMutex.runExclusive(async () => {
 					if (this.model == null) {
 						this.model = await nsfw.load(`file://${_dirname}/../../nsfw-model/`, { size: 299 });
--- a/packages/backend/src/core/AppLockService.ts
+++ b/packages/backend/src/core/AppLockService.ts
@@ -1,44 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { promisify } from 'node:util';
-import { Inject, Injectable } from '@nestjs/common';
-import redisLock from 'redis-lock';
-import * as Redis from 'ioredis';
-import { DI } from '@/di-symbols.js';
-import { bindThis } from '@/decorators.js';
-
-/**
- * Retry delay (ms) for lock acquisition
- */
-const retryDelay = 100;
-
-@Injectable()
-export class AppLockService {
-	private lock: (key: string, timeout?: number, _?: (() => Promise<void>) | undefined) => Promise<() => void>;
-
-	constructor(
-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
-	) {
-		this.lock = promisify(redisLock(this.redisClient, retryDelay));
-	}
-
-	/**
-	 * Get AP Object lock
-	 * @param uri AP object ID
-	 * @param timeout Lock timeout (ms), The timeout releases previous lock.
-	 * @returns Unlock function
-	 */
-	@bindThis
-	public getApLock(uri: string, timeout = 30 * 1000): Promise<() => void> {
-		return this.lock(`ap-object:${uri}`, timeout);
-	}
-
-	@bindThis
-	public getChartInsertLock(lockKey: string, timeout = 30 * 1000): Promise<() => void> {
-		return this.lock(`chart-insert:${lockKey}`, timeout);
-	}
-}
--- a/packages/backend/src/core/ChannelFollowingService.ts
+++ b/packages/backend/src/core/ChannelFollowingService.ts
@@ -6,7 +6,7 @@
 import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
 import Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
-import type { ChannelFollowingsRepository } from '@/models/_.js';
+import type { ChannelFollowingsRepository, ChannelsRepository, MiUser } from '@/models/_.js';
 import { MiChannel } from '@/models/_.js';
 import { IdService } from '@/core/IdService.js';
 import { GlobalEvents, GlobalEventService } from '@/core/GlobalEventService.js';
@@ -23,6 +23,8 @@ export class ChannelFollowingService implements OnModuleInit {
 		private redisClient: Redis.Redis,
 		@Inject(DI.redisForSub)
 		private redisForSub: Redis.Redis,
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
 		@Inject(DI.channelFollowingsRepository)
 		private channelFollowingsRepository: ChannelFollowingsRepository,
 		private idService: IdService,
@@ -45,6 +47,50 @@ export class ChannelFollowingService implements OnModuleInit {
 	onModuleInit() {
 	}

+	/**
+	 * フォローしているチャンネルの一覧を取得する.
+	 * @param params
+	 * @param [opts]
+	 * @param	{(boolean|undefined)} [opts.idOnly=false] チャンネルIDのみを取得するかどうか. ID以外のフィールドに値がセットされなくなり、他テーブルとのJOINも一切されなくなるので注意.
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルオーナーのユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinBannerFile=undefined] バナー画像のドライブファイルをJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	@bindThis
+	public async list(
+		params: {
+			requestUserId: MiUser['id'],
+		},
+		opts?: {
+			idOnly?: boolean;
+			joinUser?: boolean;
+			joinBannerFile?: boolean;
+		},
+	): Promise<MiChannel[]> {
+		if (opts?.idOnly) {
+			const q = this.channelFollowingsRepository.createQueryBuilder('channel_following')
+				.select('channel_following.followeeId')
+				.where('channel_following.followerId = :userId', { userId: params.requestUserId });
+
+			return q
+				.getRawMany<{ channel_following_followeeId: string }>()
+				.then(xs => xs.map(x => ({ id: x.channel_following_followeeId } as MiChannel)));
+		} else {
+			const q = this.channelsRepository.createQueryBuilder('channel')
+				.innerJoin('channel_following', 'channel_following', 'channel_following.followeeId = channel.id')
+				.where('channel_following.followerId = :userId', { userId: params.requestUserId });
+
+			if (opts?.joinUser) {
+				q.innerJoinAndSelect('channel.user', 'user');
+			}
+
+			if (opts?.joinBannerFile) {
+				q.leftJoinAndSelect('channel.banner', 'drive_file');
+			}
+
+			return q.getMany();
+		}
+	}
+
 	@bindThis
 	public async follow(
 		requestUser: MiLocalUser,
--- a/packages/backend/src/core/ChannelMutingService.ts
+++ b/packages/backend/src/core/ChannelMutingService.ts
@@ -0,0 +1,224 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import Redis from 'ioredis';
+import { Brackets, In } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import type { ChannelMutingRepository, ChannelsRepository, MiChannel, MiChannelMuting, MiUser } from '@/models/_.js';
+import { IdService } from '@/core/IdService.js';
+import { GlobalEvents, GlobalEventService } from '@/core/GlobalEventService.js';
+import { bindThis } from '@/decorators.js';
+import { RedisKVCache } from '@/misc/cache.js';
+
+@Injectable()
+export class ChannelMutingService {
+	public mutingChannelsCache: RedisKVCache<Set<string>>;
+
+	constructor(
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+		@Inject(DI.redisForSub)
+		private redisForSub: Redis.Redis,
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
+		@Inject(DI.channelMutingRepository)
+		private channelMutingRepository: ChannelMutingRepository,
+		private idService: IdService,
+		private globalEventService: GlobalEventService,
+	) {
+		this.mutingChannelsCache = new RedisKVCache<Set<string>>(this.redisClient, 'channelMutingChannels', {
+			lifetime: 1000 * 60 * 30, // 30m
+			memoryCacheLifetime: 1000 * 60, // 1m
+			fetcher: (userId) => this.channelMutingRepository.find({
+				where: { userId: userId },
+				select: ['channelId'],
+			}).then(xs => new Set(xs.map(x => x.channelId))),
+			toRedisConverter: (value) => JSON.stringify(Array.from(value)),
+			fromRedisConverter: (value) => new Set(JSON.parse(value)),
+		});
+
+		this.redisForSub.on('message', this.onMessage);
+	}
+
+	/**
+	 * ミュートしているチャンネルの一覧を取得する.
+	 * @param params
+	 * @param [opts]
+	 * @param	{(boolean|undefined)} [opts.idOnly=false] チャンネルIDのみを取得するかどうか. ID以外のフィールドに値がセットされなくなり、他テーブルとのJOINも一切されなくなるので注意.
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルオーナーのユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinBannerFile=undefined] バナー画像のドライブファイルをJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	@bindThis
+	public async list(
+		params: {
+			requestUserId: MiUser['id'],
+		},
+		opts?: {
+			idOnly?: boolean;
+			joinUser?: boolean;
+			joinBannerFile?: boolean;
+		},
+	): Promise<MiChannel[]> {
+		if (opts?.idOnly) {
+			const q = this.channelMutingRepository.createQueryBuilder('channel_muting')
+				.select('channel_muting.channelId')
+				.where('channel_muting.userId = :userId', { userId: params.requestUserId })
+				.andWhere(new Brackets(qb => {
+					qb.where('channel_muting.expiresAt IS NULL')
+						.orWhere('channel_muting.expiresAt > :now', { now: new Date() });
+				}));
+
+			return q
+				.getRawMany<{ channel_muting_channelId: string }>()
+				.then(xs => xs.map(x => ({ id: x.channel_muting_channelId } as MiChannel)));
+		} else {
+			const q = this.channelsRepository.createQueryBuilder('channel')
+				.innerJoin('channel_muting', 'channel_muting', 'channel_muting.channelId = channel.id')
+				.where('channel_muting.userId = :userId', { userId: params.requestUserId })
+				.andWhere(new Brackets(qb => {
+					qb.where('channel_muting.expiresAt IS NULL')
+						.orWhere('channel_muting.expiresAt > :now', { now: new Date() });
+				}));
+
+			if (opts?.joinUser) {
+				q.innerJoinAndSelect('channel.user', 'user');
+			}
+
+			if (opts?.joinBannerFile) {
+				q.leftJoinAndSelect('channel.banner', 'drive_file');
+			}
+
+			return q.getMany();
+		}
+	}
+
+	/**
+	 * 期限切れのチャンネルミュート情報を取得する.
+	 *
+	 * @param [opts]
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルミュートを設定したユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinChannel=undefined] ミュート先のチャンネル情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	public async findExpiredMutings(opts?: {
+		joinUser?: boolean;
+		joinChannel?: boolean;
+	}): Promise<MiChannelMuting[]> {
+		const now = new Date();
+		const q = this.channelMutingRepository.createQueryBuilder('channel_muting')
+			.where('channel_muting.expiresAt < :now', { now });
+
+		if (opts?.joinUser) {
+			q.innerJoinAndSelect('channel_muting.user', 'user');
+		}
+
+		if (opts?.joinChannel) {
+			q.leftJoinAndSelect('channel_muting.channel', 'channel');
+		}
+
+		return q.getMany();
+	}
+
+	/**
+	 * 既にミュートされているかどうかをキャッシュから取得する.
+	 * @param params
+	 * @param params.requestUserId
+	 */
+	@bindThis
+	public async isMuted(params: {
+		requestUserId: MiUser['id'],
+		targetChannelId: MiChannel['id'],
+	}): Promise<boolean> {
+		const mutedChannels = await this.mutingChannelsCache.get(params.requestUserId);
+		return (mutedChannels?.has(params.targetChannelId) ?? false);
+	}
+
+	/**
+	 * チャンネルをミュートする.
+	 * @param params
+	 * @param {(Date|null|undefined)} [params.expiresAt] ミュートの有効期限. nullまたは省略時は無期限.
+	 */
+	@bindThis
+	public async mute(params: {
+		requestUserId: MiUser['id'],
+		targetChannelId: MiChannel['id'],
+		expiresAt?: Date | null,
+	}): Promise<void> {
+		await this.channelMutingRepository.insert({
+			id: this.idService.gen(),
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+			expiresAt: params.expiresAt,
+		});
+
+		this.globalEventService.publishInternalEvent('muteChannel', {
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+		});
+	}
+
+	/**
+	 * チャンネルのミュートを解除する.
+	 * @param params
+	 */
+	@bindThis
+	public async unmute(params: {
+		requestUserId: MiUser['id'],
+		targetChannelId: MiChannel['id'],
+	}): Promise<void> {
+		await this.channelMutingRepository.delete({
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+		});
+
+		this.globalEventService.publishInternalEvent('unmuteChannel', {
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+		});
+	}
+
+	/**
+	 * 期限切れのチャンネルミュート情報を削除する.
+	 */
+	@bindThis
+	public async eraseExpiredMutings(): Promise<void> {
+		const expiredMutings = await this.findExpiredMutings();
+		await this.channelMutingRepository.delete({ id: In(expiredMutings.map(x => x.id)) });
+
+		const userIds = [...new Set(expiredMutings.map(x => x.userId))];
+		for (const userId of userIds) {
+			this.mutingChannelsCache.refresh(userId).then();
+		}
+	}
+
+	@bindThis
+	private async 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 'muteChannel': {
+					this.mutingChannelsCache.refresh(body.userId).then();
+					break;
+				}
+				case 'unmuteChannel': {
+					this.mutingChannelsCache.delete(body.userId).then();
+					break;
+				}
+			}
+		}
+	}
+
+	@bindThis
+	public dispose(): void {
+		this.mutingChannelsCache.dispose();
+	}
+
+	@bindThis
+	public onApplicationShutdown(signal?: string | undefined): void {
+		this.dispose();
+	}
+}
--- a/packages/backend/src/core/CoreModule.ts
+++ b/packages/backend/src/core/CoreModule.ts
@@ -15,12 +15,12 @@ import { SystemWebhookService } from '@/core/SystemWebhookService.js';
 import { UserSearchService } from '@/core/UserSearchService.js';
 import { WebhookTestService } from '@/core/WebhookTestService.js';
 import { FlashService } from '@/core/FlashService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { AccountMoveService } from './AccountMoveService.js';
 import { AccountUpdateService } from './AccountUpdateService.js';
 import { AiService } from './AiService.js';
 import { AnnouncementService } from './AnnouncementService.js';
 import { AntennaService } from './AntennaService.js';
-import { AppLockService } from './AppLockService.js';
 import { AchievementService } from './AchievementService.js';
 import { AvatarDecorationService } from './AvatarDecorationService.js';
 import { CaptchaService } from './CaptchaService.js';
@@ -165,7 +165,6 @@ const $AccountUpdateService: Provider = { provide: 'AccountUpdateService', useEx
 const $AiService: Provider = { provide: 'AiService', useExisting: AiService };
 const $AnnouncementService: Provider = { provide: 'AnnouncementService', useExisting: AnnouncementService };
 const $AntennaService: Provider = { provide: 'AntennaService', useExisting: AntennaService };
-const $AppLockService: Provider = { provide: 'AppLockService', useExisting: AppLockService };
 const $AchievementService: Provider = { provide: 'AchievementService', useExisting: AchievementService };
 const $AvatarDecorationService: Provider = { provide: 'AvatarDecorationService', useExisting: AvatarDecorationService };
 const $CaptchaService: Provider = { provide: 'CaptchaService', useExisting: CaptchaService };
@@ -225,6 +224,7 @@ const $FeaturedService: Provider = { provide: 'FeaturedService', useExisting: Fe
 const $FanoutTimelineService: Provider = { provide: 'FanoutTimelineService', useExisting: FanoutTimelineService };
 const $FanoutTimelineEndpointService: Provider = { provide: 'FanoutTimelineEndpointService', useExisting: FanoutTimelineEndpointService };
 const $ChannelFollowingService: Provider = { provide: 'ChannelFollowingService', useExisting: ChannelFollowingService };
+const $ChannelMutingService: Provider = { provide: 'ChannelMutingService', useExisting: ChannelMutingService };
 const $ChatService: Provider = { provide: 'ChatService', useExisting: ChatService };
 const $RegistryApiService: Provider = { provide: 'RegistryApiService', useExisting: RegistryApiService };
 const $ReversiService: Provider = { provide: 'ReversiService', useExisting: ReversiService };
@@ -318,7 +318,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		AiService,
 		AnnouncementService,
 		AntennaService,
-		AppLockService,
 		AchievementService,
 		AvatarDecorationService,
 		CaptchaService,
@@ -378,6 +377,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		FanoutTimelineService,
 		FanoutTimelineEndpointService,
 		ChannelFollowingService,
+		ChannelMutingService,
 		ChatService,
 		RegistryApiService,
 		ReversiService,
@@ -467,7 +467,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$AiService,
 		$AnnouncementService,
 		$AntennaService,
-		$AppLockService,
 		$AchievementService,
 		$AvatarDecorationService,
 		$CaptchaService,
@@ -527,6 +526,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$FanoutTimelineService,
 		$FanoutTimelineEndpointService,
 		$ChannelFollowingService,
+		$ChannelMutingService,
 		$ChatService,
 		$RegistryApiService,
 		$ReversiService,
@@ -617,7 +617,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		AiService,
 		AnnouncementService,
 		AntennaService,
-		AppLockService,
 		AchievementService,
 		AvatarDecorationService,
 		CaptchaService,
@@ -677,6 +676,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		FanoutTimelineService,
 		FanoutTimelineEndpointService,
 		ChannelFollowingService,
+		ChannelMutingService,
 		ChatService,
 		RegistryApiService,
 		ReversiService,
@@ -765,7 +765,6 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$AiService,
 		$AnnouncementService,
 		$AntennaService,
-		$AppLockService,
 		$AchievementService,
 		$AvatarDecorationService,
 		$CaptchaService,
@@ -824,6 +823,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$FanoutTimelineService,
 		$FanoutTimelineEndpointService,
 		$ChannelFollowingService,
+		$ChannelMutingService,
 		$ChatService,
 		$RegistryApiService,
 		$ReversiService,
--- a/packages/backend/src/core/FanoutTimelineEndpointService.ts
+++ b/packages/backend/src/core/FanoutTimelineEndpointService.ts
@@ -19,6 +19,8 @@ import { isQuote, isRenote } from '@/misc/is-renote.js';
 import { CacheService } from '@/core/CacheService.js';
 import { isReply } from '@/misc/is-reply.js';
 import { isInstanceMuted } from '@/misc/is-instance-muted.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+import { isChannelRelated } from '@/misc/is-channel-related.js';

 type NoteFilter = (note: MiNote) => boolean;

@@ -35,6 +37,7 @@ type TimelineOptions = {
 	ignoreAuthorFromBlock?: boolean;
 	ignoreAuthorFromMute?: boolean;
 	ignoreAuthorFromInstanceBlock?: boolean;
+	ignoreAuthorChannelFromMute?: boolean;
 	excludeNoFiles?: boolean;
 	excludeReplies?: boolean;
 	excludePureRenotes: boolean;
@@ -55,6 +58,7 @@ export class FanoutTimelineEndpointService {
 		private cacheService: CacheService,
 		private fanoutTimelineService: FanoutTimelineService,
 		private utilityService: UtilityService,
+		private channelMutingService: ChannelMutingService,
 	) {
 	}

@@ -111,11 +115,13 @@ export class FanoutTimelineEndpointService {
 					userIdsWhoMeMutingRenotes,
 					userIdsWhoBlockingMe,
 					userMutedInstances,
+					userMutedChannels,
 				] = await Promise.all([
 					this.cacheService.userMutingsCache.fetch(ps.me.id),
 					this.cacheService.renoteMutingsCache.fetch(ps.me.id),
 					this.cacheService.userBlockedCache.fetch(ps.me.id),
 					this.cacheService.userProfileCache.fetch(me.id).then(p => new Set(p.mutedInstances)),
+					this.channelMutingService.mutingChannelsCache.fetch(me.id),
 				]);

 				const parentFilter = filter;
@@ -126,6 +132,7 @@ export class FanoutTimelineEndpointService {
 					if (isUserRelated(note.renote, userIdsWhoMeMuting, ps.ignoreAuthorFromMute)) return false;
 					if (!ps.ignoreAuthorFromMute && isRenote(note) && !isQuote(note) && userIdsWhoMeMutingRenotes.has(note.userId)) return false;
 					if (isInstanceMuted(note, userMutedInstances)) return false;
+					if (isChannelRelated(note, userMutedChannels, ps.ignoreAuthorChannelFromMute)) return false;

 					return parentFilter(note);
 				};
--- a/packages/backend/src/core/FetchInstanceMetadataService.ts
+++ b/packages/backend/src/core/FetchInstanceMetadataService.ts
@@ -5,9 +5,9 @@

 import { URL } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
-import { JSDOM } from 'jsdom';
 import tinycolor from 'tinycolor2';
 import * as Redis from 'ioredis';
+import * as htmlParser from 'node-html-parser';
 import type { MiInstance } from '@/models/Instance.js';
 import type Logger from '@/logger.js';
 import { DI } from '@/di-symbols.js';
@@ -15,7 +15,6 @@ import { LoggerService } from '@/core/LoggerService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { bindThis } from '@/decorators.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
-import type { DOMWindow } from 'jsdom';

 type NodeInfo = {
 	openRegistrations?: unknown;
@@ -59,7 +58,7 @@ export class FetchInstanceMetadataService {
 		return await this.redisClient.set(
 			`fetchInstanceMetadata:mutex:v2:${host}`, '1',
 			'EX', 30, // 30秒したら自動でロック解除 https://github.com/misskey-dev/misskey/issues/13506#issuecomment-1975375395
-			'GET' // 古い値を返す（なかったらnull）
+			'GET', // 古い値を返す（なかったらnull）
 		);
 	}

@@ -181,15 +180,14 @@ export class FetchInstanceMetadataService {
 	}

 	@bindThis
-	private async fetchDom(instance: MiInstance): Promise<Document> {
+	private async fetchDom(instance: MiInstance): Promise<htmlParser.HTMLElement> {
 		this.logger.info(`Fetching HTML of ${instance.host} ...`);

 		const url = 'https://' + instance.host;

 		const html = await this.httpRequestService.getHtml(url);

-		const { window } = new JSDOM(html);
-		const doc = window.document;
+		const doc = htmlParser.parse(html);

 		return doc;
 	}
@@ -206,12 +204,12 @@ export class FetchInstanceMetadataService {
 	}

 	@bindThis
-	private async fetchFaviconUrl(instance: MiInstance, doc: Document | null): Promise<string | null> {
+	private async fetchFaviconUrl(instance: MiInstance, doc: htmlParser.HTMLElement | null): Promise<string | null> {
 		const url = 'https://' + instance.host;

 		if (doc) {
 			// https://github.com/misskey-dev/misskey/pull/8220#issuecomment-1025104043
-			const href = Array.from(doc.getElementsByTagName('link')).reverse().find(link => link.relList.contains('icon'))?.href;
+			const href = Array.from(doc.getElementsByTagName('link')).reverse().find(link => link.attributes.rel === 'icon')?.attributes.href;

 			if (href) {
 				return (new URL(href, url)).href;
@@ -232,7 +230,7 @@ export class FetchInstanceMetadataService {
 	}

 	@bindThis
-	private async fetchIconUrl(instance: MiInstance, doc: Document | null, manifest: Record<string, any> | null): Promise<string | null> {
+	private async fetchIconUrl(instance: MiInstance, doc: htmlParser.HTMLElement | null, manifest: Record<string, any> | null): Promise<string | null> {
 		if (manifest && manifest.icons && manifest.icons.length > 0 && manifest.icons[0].src) {
 			const url = 'https://' + instance.host;
 			return (new URL(manifest.icons[0].src, url)).href;
@@ -246,9 +244,9 @@ export class FetchInstanceMetadataService {
 			// https://github.com/misskey-dev/misskey/pull/8220/files/0ec4eba22a914e31b86874f12448f88b3e58dd5a#r796487559
 			const href =
 				[
-					links.find(link => link.relList.contains('apple-touch-icon-precomposed'))?.href,
-					links.find(link => link.relList.contains('apple-touch-icon'))?.href,
-					links.find(link => link.relList.contains('icon'))?.href,
+					links.find(link => link.attributes.rel?.split(/\s+/).includes('apple-touch-icon-precomposed'))?.attributes.href,
+					links.find(link => link.attributes.rel?.split(/\s+/).includes('apple-touch-icon'))?.attributes.href,
+					links.find(link => link.attributes.rel?.split(/\s+/).includes('icon'))?.attributes.href,
 				]
 					.find(href => href);

@@ -261,7 +259,7 @@ export class FetchInstanceMetadataService {
 	}

 	@bindThis
-	private async getThemeColor(info: NodeInfo | null, doc: Document | null, manifest: Record<string, any> | null): Promise<string | null> {
+	private async getThemeColor(info: NodeInfo | null, doc: htmlParser.HTMLElement | null, manifest: Record<string, any> | null): Promise<string | null> {
 		const themeColor = info?.metadata?.themeColor ?? doc?.querySelector('meta[name="theme-color"]')?.getAttribute('content') ?? manifest?.theme_color;

 		if (themeColor) {
@@ -273,7 +271,7 @@ export class FetchInstanceMetadataService {
 	}

 	@bindThis
-	private async getSiteName(info: NodeInfo | null, doc: Document | null, manifest: Record<string, any> | null): Promise<string | null> {
+	private async getSiteName(info: NodeInfo | null, doc: htmlParser.HTMLElement | null, manifest: Record<string, any> | null): Promise<string | null> {
 		if (info && info.metadata) {
 			if (typeof info.metadata.nodeName === 'string') {
 				return info.metadata.nodeName;
@@ -298,7 +296,7 @@ export class FetchInstanceMetadataService {
 	}

 	@bindThis
-	private async getDescription(info: NodeInfo | null, doc: Document | null, manifest: Record<string, any> | null): Promise<string | null> {
+	private async getDescription(info: NodeInfo | null, doc: htmlParser.HTMLElement | null, manifest: Record<string, any> | null): Promise<string | null> {
 		if (info && info.metadata) {
 			if (typeof info.metadata.nodeDescription === 'string') {
 				return info.metadata.nodeDescription;
--- a/packages/backend/src/core/FileInfoService.ts
+++ b/packages/backend/src/core/FileInfoService.ts
@@ -20,8 +20,8 @@ import { AiService } from '@/core/AiService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
-import type { PredictionType } from 'nsfwjs';
 import { isMimeImage } from '@/misc/is-mime-image.js';
+import type { PredictionType } from 'nsfwjs';

 export type FileInfo = {
 	size: number;
@@ -339,7 +339,7 @@ export class FileInfoService {
 	}

 	@bindThis
-	public fixMime(mime: string | fileType.MimeType): string {
+	public fixMime(mime: string): string {
 		// see https://github.com/misskey-dev/misskey/pull/10686
 		if (mime === 'audio/x-flac') {
 			return 'audio/flac';
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -255,6 +255,8 @@ export interface InternalEventTypes {
 	metaUpdated: { before?: MiMeta; after: MiMeta; };
 	followChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
 	unfollowChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
+	muteChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
+	unmuteChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
 	updateUserProfile: MiUserProfile;
 	mute: { muterId: MiUser['id']; muteeId: MiUser['id']; };
 	unmute: { muterId: MiUser['id']; muteeId: MiUser['id']; };
--- a/packages/backend/src/core/MfmService.ts
+++ b/packages/backend/src/core/MfmService.ts
@@ -5,26 +5,19 @@

 import { URL } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
-import * as parse5 from 'parse5';
-import { type Document, type HTMLParagraphElement, Window, XMLSerializer } from 'happy-dom';
+import * as htmlParser from 'node-html-parser';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { intersperse } from '@/misc/prelude/array.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import type { IMentionedRemoteUsers } from '@/models/Note.js';
 import { bindThis } from '@/decorators.js';
-import type { DefaultTreeAdapterMap } from 'parse5';
+import { escapeHtml } from '@/misc/escape-html.js';
 import type * as mfm from 'mfm-js';

-const treeAdapter = parse5.defaultTreeAdapter;
-type Node = DefaultTreeAdapterMap['node'];
-type ChildNode = DefaultTreeAdapterMap['childNode'];
-
 const urlRegex = /^https?:\/\/[\w\/:%#@$&?!()\[\]~.,=+\-]+/;
 const urlRegexFull = /^https?:\/\/[\w\/:%#@$&?!()\[\]~.,=+\-]+$/;

-export type Appender = (document: Document, body: HTMLParagraphElement) => void;
-
@Injectable()
 export class MfmService {
 	constructor(
@@ -40,68 +33,68 @@ export class MfmService {

 		const normalizedHashtagNames = hashtagNames == null ? undefined : new Set<string>(hashtagNames.map(x => normalizeForSearch(x)));

-		const dom = parse5.parseFragment(html);
+		const doc = htmlParser.parse(`<div>${html}</div>`);

 		let text = '';

-		for (const n of dom.childNodes) {
+		for (const n of doc.childNodes) {
 			analyze(n);
 		}

 		return text.trim();

-		function getText(node: Node): string {
-			if (treeAdapter.isTextNode(node)) return node.value;
-			if (!treeAdapter.isElementNode(node)) return '';
-			if (node.nodeName === 'br') return '\n';
+		function getText(node: htmlParser.Node): string {
+			if (node instanceof htmlParser.TextNode) return node.textContent;
+			if (!(node instanceof htmlParser.HTMLElement)) return '';
+			if (node.tagName === 'BR') return '\n';

-			if (node.childNodes) {
+			if (node.childNodes != null) {
 				return node.childNodes.map(n => getText(n)).join('');
 			}

 			return '';
 		}

-		function appendChildren(childNodes: ChildNode[]): void {
-			if (childNodes) {
+		function analyzeChildren(childNodes: htmlParser.Node[] | null): void {
+			if (childNodes != null) {
 				for (const n of childNodes) {
 					analyze(n);
 				}
 			}
 		}

-		function analyze(node: Node) {
-			if (treeAdapter.isTextNode(node)) {
-				text += node.value;
+		function analyze(node: htmlParser.Node) {
+			if (node instanceof htmlParser.TextNode) {
+				text += node.textContent;
 				return;
 			}

 			// Skip comment or document type node
-			if (!treeAdapter.isElementNode(node)) {
+			if (!(node instanceof htmlParser.HTMLElement)) {
 				return;
 			}

-			switch (node.nodeName) {
-				case 'br': {
+			switch (node.tagName) {
+				case 'BR': {
 					text += '\n';
 					break;
 				}

-				case 'a': {
+				case 'A': {
 					const txt = getText(node);
-					const rel = node.attrs.find(x => x.name === 'rel');
-					const href = node.attrs.find(x => x.name === 'href');
+					const rel = node.attributes.rel;
+					const href = node.attributes.href;

 					// ハッシュタグ
-					if (normalizedHashtagNames && href && normalizedHashtagNames.has(normalizeForSearch(txt))) {
+					if (normalizedHashtagNames && href != null && normalizedHashtagNames.has(normalizeForSearch(txt))) {
 						text += txt;
 						// メンション
-					} else if (txt.startsWith('@') && !(rel && rel.value.startsWith('me '))) {
+					} else if (txt.startsWith('@') && !(rel != null && rel.startsWith('me '))) {
 						const part = txt.split('@');

 						if (part.length === 2 && href) {
 							//#region ホスト名部分が省略されているので復元する
-							const acct = `${txt}@${(new URL(href.value)).hostname}`;
+							const acct = `${txt}@${(new URL(href)).hostname}`;
 							text += acct;
 							//#endregion
 						} else if (part.length === 3) {
@@ -116,17 +109,17 @@ export class MfmService {
 							if (!href) {
 								return txt;
 							}
-							if (!txt || txt === href.value) {	// #6383: Missing text node
-								if (href.value.match(urlRegexFull)) {
-									return href.value;
+							if (!txt || txt === href) {	// #6383: Missing text node
+								if (href.match(urlRegexFull)) {
+									return href;
 								} else {
-									return `<${href.value}>`;
+									return `<${href}>`;
 								}
 							}
-							if (href.value.match(urlRegex) && !href.value.match(urlRegexFull)) {
-								return `[${txt}](<${href.value}>)`;	// #6846
+							if (href.match(urlRegex) && !href.match(urlRegexFull)) {
+								return `[${txt}](<${href}>)`;	// #6846
 							} else {
-								return `[${txt}](${href.value})`;
+								return `[${txt}](${href})`;
 							}
 						};

@@ -135,60 +128,64 @@ export class MfmService {
 					break;
 				}

-				case 'h1': {
+				case 'H1': {
 					text += '【';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					text += '】\n';
 					break;
 				}

-				case 'b':
-				case 'strong': {
+				case 'B':
+				case 'STRONG': {
 					text += '**';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					text += '**';
 					break;
 				}

-				case 'small': {
+				case 'SMALL': {
 					text += '<small>';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					text += '</small>';
 					break;
 				}

-				case 's':
-				case 'del': {
+				case 'S':
+				case 'DEL': {
 					text += '~~';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					text += '~~';
 					break;
 				}

-				case 'i':
-				case 'em': {
+				case 'I':
+				case 'EM': {
 					text += '<i>';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					text += '</i>';
 					break;
 				}

-				case 'ruby': {
+				case 'RUBY': {
 					let ruby: [string, string][] = [];
 					for (const child of node.childNodes) {
-						if (child.nodeName === 'rp') {
+						if ((child instanceof htmlParser.TextNode) && !/\s|\[|\]/.test(child.textContent)) {
+							ruby.push([child.textContent, '']);
 							continue;
 						}
-						if (treeAdapter.isTextNode(child) && !/\s|\[|\]/.test(child.value)) {
-							ruby.push([child.value, '']);
+
+						if (!(child instanceof htmlParser.HTMLElement)) continue;
+
+						if (child.tagName === 'RP') {
 							continue;
 						}
-						if (child.nodeName === 'rt' && ruby.length > 0) {
+
+						if (child.tagName === 'RT' && ruby.length > 0) {
 							const rt = getText(child);
 							if (/\s|\[|\]/.test(rt)) {
 								// If any space is included in rt, it is treated as a normal text
 								ruby = [];
-								appendChildren(node.childNodes);
+								analyzeChildren(node.childNodes);
 								break;
 							} else {
 								ruby.at(-1)![1] = rt;
@@ -197,7 +194,7 @@ export class MfmService {
 						}
 						// If any other element is included in ruby, it is treated as a normal text
 						ruby = [];
-						appendChildren(node.childNodes);
+						analyzeChildren(node.childNodes);
 						break;
 					}
 					for (const [base, rt] of ruby) {
@@ -207,26 +204,30 @@ export class MfmService {
 				}

 				// block code (<pre><code>)
-				case 'pre': {
-					if (node.childNodes.length === 1 && node.childNodes[0].nodeName === 'code') {
+				case 'PRE': {
+					if (node.childNodes.length === 1 && (node.childNodes[0] instanceof htmlParser.HTMLElement) && node.childNodes[0].tagName === 'CODE') {
 						text += '\n```\n';
 						text += getText(node.childNodes[0]);
 						text += '\n```\n';
+					} else if (node.childNodes.length === 1 && (node.childNodes[0] instanceof htmlParser.TextNode) && node.childNodes[0].textContent.startsWith('<code>') && node.childNodes[0].textContent.endsWith('</code>')) {
+						text += '\n```\n';
+						text += node.childNodes[0].textContent.slice(6, -7);
+						text += '\n```\n';
 					} else {
-						appendChildren(node.childNodes);
+						analyzeChildren(node.childNodes);
 					}
 					break;
 				}

 				// inline code (<code>)
-				case 'code': {
+				case 'CODE': {
 					text += '`';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					text += '`';
 					break;
 				}

-				case 'blockquote': {
+				case 'BLOCKQUOTE': {
 					const t = getText(node);
 					if (t) {
 						text += '\n> ';
@@ -235,33 +236,33 @@ export class MfmService {
 					break;
 				}

-				case 'p':
-				case 'h2':
-				case 'h3':
-				case 'h4':
-				case 'h5':
-				case 'h6': {
+				case 'P':
+				case 'H2':
+				case 'H3':
+				case 'H4':
+				case 'H5':
+				case 'H6': {
 					text += '\n\n';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					break;
 				}

 				// other block elements
-				case 'div':
-				case 'header':
-				case 'footer':
-				case 'article':
-				case 'li':
-				case 'dt':
-				case 'dd': {
+				case 'DIV':
+				case 'HEADER':
+				case 'FOOTER':
+				case 'ARTICLE':
+				case 'LI':
+				case 'DT':
+				case 'DD': {
 					text += '\n';
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					break;
 				}

 				default:	// includes inline elements
 				{
-					appendChildren(node.childNodes);
+					analyzeChildren(node.childNodes);
 					break;
 				}
 			}
@@ -269,52 +270,35 @@ export class MfmService {
 	}

 	@bindThis
-	public toHtml(nodes: mfm.MfmNode[] | null, mentionedRemoteUsers: IMentionedRemoteUsers = [], additionalAppenders: Appender[] = []) {
+	public toHtml(nodes: mfm.MfmNode[] | null, mentionedRemoteUsers: IMentionedRemoteUsers = [], extraHtml: string | null = null) {
 		if (nodes == null) {
 			return null;
 		}

-		const { happyDOM, window } = new Window();
-
-		const doc = window.document;
-
-		const body = doc.createElement('p');
-
-		function appendChildren(children: mfm.MfmNode[], targetElement: any): void {
-			if (children) {
-				for (const child of children.map(x => (handlers as any)[x.type](x))) targetElement.appendChild(child);
-			}
+		function toHtml(children?: mfm.MfmNode[]): string {
+			if (children == null) return '';
+			return children.map(x => handlers[x.type](x)).join('');
 		}

 		function fnDefault(node: mfm.MfmFn) {
-			const el = doc.createElement('i');
-			appendChildren(node.children, el);
-			return el;
+			return `<i>${toHtml(node.children)}</i>`;
 		}

-		const handlers: { [K in mfm.MfmNode['type']]: (node: mfm.NodeType<K>) => any } = {
+		const handlers = {
 			bold: (node) => {
-				const el = doc.createElement('b');
-				appendChildren(node.children, el);
-				return el;
+				return `<b>${toHtml(node.children)}</b>`;
 			},

 			small: (node) => {
-				const el = doc.createElement('small');
-				appendChildren(node.children, el);
-				return el;
+				return `<small>${toHtml(node.children)}</small>`;
 			},

 			strike: (node) => {
-				const el = doc.createElement('del');
-				appendChildren(node.children, el);
-				return el;
+				return `<del>${toHtml(node.children)}</del>`;
 			},

 			italic: (node) => {
-				const el = doc.createElement('i');
-				appendChildren(node.children, el);
-				return el;
+				return `<i>${toHtml(node.children)}</i>`;
 			},

 			fn: (node) => {
@@ -323,10 +307,7 @@ export class MfmService {
 						const text = node.children[0].type === 'text' ? node.children[0].props.text : '';
 						try {
 							const date = new Date(parseInt(text, 10) * 1000);
-							const el = doc.createElement('time');
-							el.setAttribute('datetime', date.toISOString());
-							el.textContent = date.toISOString();
-							return el;
+							return `<time datetime="${escapeHtml(date.toISOString())}">${escapeHtml(date.toISOString())}</time>`;
 						} catch (err) {
 							return fnDefault(node);
 						}
@@ -336,21 +317,9 @@ export class MfmService {
 						if (node.children.length === 1) {
 							const child = node.children[0];
 							const text = child.type === 'text' ? child.props.text : '';
-							const rubyEl = doc.createElement('ruby');
-							const rtEl = doc.createElement('rt');

-							// ruby未対応のHTMLサニタイザーを通したときにルビが「劉備（りゅうび）」となるようにする
-							const rpStartEl = doc.createElement('rp');
-							rpStartEl.appendChild(doc.createTextNode('('));
-							const rpEndEl = doc.createElement('rp');
-							rpEndEl.appendChild(doc.createTextNode(')'));
-
-							rubyEl.appendChild(doc.createTextNode(text.split(' ')[0]));
-							rtEl.appendChild(doc.createTextNode(text.split(' ')[1]));
-							rubyEl.appendChild(rpStartEl);
-							rubyEl.appendChild(rtEl);
-							rubyEl.appendChild(rpEndEl);
-							return rubyEl;
+							// ruby未対応のHTMLサニタイザーを通したときにルビが「対象テキスト（ルビテキスト）」にフォールバックするようにする
+							return `<ruby>${escapeHtml(text.split(' ')[0])}<rp>(</rp><rt>${escapeHtml(text.split(' ')[1])}</rt><rp>)</rp></ruby>`;
 						} else {
 							const rt = node.children.at(-1);

@@ -359,21 +328,9 @@ export class MfmService {
 							}

 							const text = rt.type === 'text' ? rt.props.text : '';
-							const rubyEl = doc.createElement('ruby');
-							const rtEl = doc.createElement('rt');

-							// ruby未対応のHTMLサニタイザーを通したときにルビが「劉備（りゅうび）」となるようにする
-							const rpStartEl = doc.createElement('rp');
-							rpStartEl.appendChild(doc.createTextNode('('));
-							const rpEndEl = doc.createElement('rp');
-							rpEndEl.appendChild(doc.createTextNode(')'));
-
-							appendChildren(node.children.slice(0, node.children.length - 1), rubyEl);
-							rtEl.appendChild(doc.createTextNode(text.trim()));
-							rubyEl.appendChild(rpStartEl);
-							rubyEl.appendChild(rtEl);
-							rubyEl.appendChild(rpEndEl);
-							return rubyEl;
+							// ruby未対応のHTMLサニタイザーを通したときにルビが「対象テキスト（ルビテキスト）」にフォールバックするようにする
+							return `<ruby>${toHtml(node.children.slice(0, node.children.length - 1))}<rp>(</rp><rt>${escapeHtml(text.trim())}</rt><rp>)</rp></ruby>`;
 						}
 					}

@@ -384,125 +341,98 @@ export class MfmService {
 			},

 			blockCode: (node) => {
-				const pre = doc.createElement('pre');
-				const inner = doc.createElement('code');
-				inner.textContent = node.props.code;
-				pre.appendChild(inner);
-				return pre;
+				return `<pre><code>${escapeHtml(node.props.code)}</code></pre>`;
 			},

 			center: (node) => {
-				const el = doc.createElement('div');
-				appendChildren(node.children, el);
-				return el;
+				return `<div style="text-align: center;">${toHtml(node.children)}</div>`;
 			},

 			emojiCode: (node) => {
-				return doc.createTextNode(`\u200B:${node.props.name}:\u200B`);
+				return `\u200B:${escapeHtml(node.props.name)}:\u200B`;
 			},

 			unicodeEmoji: (node) => {
-				return doc.createTextNode(node.props.emoji);
+				return node.props.emoji;
 			},

 			hashtag: (node) => {
-				const a = doc.createElement('a');
-				a.setAttribute('href', `${this.config.url}/tags/${node.props.hashtag}`);
-				a.textContent = `#${node.props.hashtag}`;
-				a.setAttribute('rel', 'tag');
-				return a;
+				return `<a href="${escapeHtml(`${this.config.url}/tags/${encodeURIComponent(node.props.hashtag)}`)}" rel="tag">#${escapeHtml(node.props.hashtag)}</a>`;
 			},

 			inlineCode: (node) => {
-				const el = doc.createElement('code');
-				el.textContent = node.props.code;
-				return el;
+				return `<code>${escapeHtml(node.props.code)}</code>`;
 			},

 			mathInline: (node) => {
-				const el = doc.createElement('code');
-				el.textContent = node.props.formula;
-				return el;
+				return `<code>${escapeHtml(node.props.formula)}</code>`;
 			},

 			mathBlock: (node) => {
-				const el = doc.createElement('code');
-				el.textContent = node.props.formula;
-				return el;
+				return `<pre><code>${escapeHtml(node.props.formula)}</code></pre>`;
 			},

 			link: (node) => {
-				const a = doc.createElement('a');
-				a.setAttribute('href', node.props.url);
-				appendChildren(node.children, a);
-				return a;
+				try {
+					const url = new URL(node.props.url);
+					return `<a href="${escapeHtml(url.href)}">${toHtml(node.children)}</a>`;
+				} catch (err) {
+					return `[${toHtml(node.children)}](${escapeHtml(node.props.url)})`;
+				}
 			},

 			mention: (node) => {
-				const a = doc.createElement('a');
 				const { username, host, acct } = node.props;
 				const remoteUserInfo = mentionedRemoteUsers.find(remoteUser => remoteUser.username.toLowerCase() === username.toLowerCase() && remoteUser.host?.toLowerCase() === host?.toLowerCase());
-				a.setAttribute('href', remoteUserInfo
+				const href = remoteUserInfo
 					? (remoteUserInfo.url ? remoteUserInfo.url : remoteUserInfo.uri)
-					: `${this.config.url}/${acct.endsWith(`@${this.config.url}`) ? acct.substring(0, acct.length - this.config.url.length - 1) : acct}`);
-				a.className = 'u-url mention';
-				a.textContent = acct;
-				return a;
+					: `${this.config.url}/${acct.endsWith(`@${this.config.url}`) ? acct.substring(0, acct.length - this.config.url.length - 1) : acct}`;
+				try {
+					const url = new URL(href);
+					return `<a href="${escapeHtml(url.href)}" class="u-url mention">${escapeHtml(acct)}</a>`;
+				} catch (err) {
+					return escapeHtml(acct);
+				}
 			},

 			quote: (node) => {
-				const el = doc.createElement('blockquote');
-				appendChildren(node.children, el);
-				return el;
+				return `<blockquote>${toHtml(node.children)}</blockquote>`;
 			},

 			text: (node) => {
 				if (!node.props.text.match(/[\r\n]/)) {
-					return doc.createTextNode(node.props.text);
+					return escapeHtml(node.props.text);
 				}

-				const el = doc.createElement('span');
-				const nodes = node.props.text.split(/\r\n|\r|\n/).map(x => doc.createTextNode(x));
+				let html = '';

-				for (const x of intersperse<FIXME | 'br'>('br', nodes)) {
-					el.appendChild(x === 'br' ? doc.createElement('br') : x);
+				const lines = node.props.text.split(/\r\n|\r|\n/).map(x => escapeHtml(x));
+
+				for (const x of intersperse<FIXME | 'br'>('br', lines)) {
+					html += x === 'br' ? '<br />' : x;
 				}

-				return el;
+				return html;
 			},

 			url: (node) => {
-				const a = doc.createElement('a');
-				a.setAttribute('href', node.props.url);
-				a.textContent = node.props.url;
-				return a;
+				try {
+					const url = new URL(node.props.url);
+					return `<a href="${escapeHtml(url.href)}">${escapeHtml(node.props.url)}</a>`;
+				} catch (err) {
+					return escapeHtml(node.props.url);
+				}
 			},

 			search: (node) => {
-				const a = doc.createElement('a');
-				a.setAttribute('href', `https://www.google.com/search?q=${node.props.query}`);
-				a.textContent = node.props.content;
-				return a;
+				return `<a href="${escapeHtml(`https://www.google.com/search?q=${encodeURIComponent(node.props.query)}`)}">${escapeHtml(node.props.content)}</a>`;
 			},

 			plain: (node) => {
-				const el = doc.createElement('span');
-				appendChildren(node.children, el);
-				return el;
+				return `<span>${toHtml(node.children)}</span>`;
 			},
-		};
+		} satisfies { [K in mfm.MfmNode['type']]: (node: mfm.NodeType<K>) => string } as { [K in mfm.MfmNode['type']]: (node: mfm.MfmNode) => string };

-		appendChildren(nodes, body);
-
-		for (const additionalAppender of additionalAppenders) {
-			additionalAppender(doc, body);
-		}
-
-		// Remove the unnecessary namespace
-		const serialized = new XMLSerializer().serializeToString(body).replace(/^\s*<p xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\">/, '<p>');
-
-		happyDOM.close().catch(err => {});
-
-		return serialized;
+		return `${toHtml(nodes)}${extraHtml ?? ''}`;
 	}
 }
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -604,6 +604,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 			replyUserHost: data.reply ? data.reply.userHost : null,
 			renoteUserId: data.renote ? data.renote.userId : null,
 			renoteUserHost: data.renote ? data.renote.userHost : null,
+			renoteChannelId: data.renote ? data.renote.channelId : null,
 			userHost: user.host,
 		});

--- a/packages/backend/src/core/NotificationService.ts
+++ b/packages/backend/src/core/NotificationService.ts
@@ -202,7 +202,7 @@ export class NotificationService implements OnApplicationShutdown {
 	}

 	// TODO
-	//const locales = await import('../../../../locales/index.js');
+	//const locales = await import('i18n');

 	// TODO: locale ファイルをクライアント用とサーバー用で分けたい

@@ -271,7 +271,7 @@ export class NotificationService implements OnApplicationShutdown {
 		let untilTime = untilId ? this.toXListId(untilId) : null;

 		let notifications: MiNotification[];
-		for (;;) {
+		for (; ;) {
 			let notificationsRes: [id: string, fields: string[]][];

 			// sinceidのみの場合は古い順、そうでない場合は新しい順。 QueryService.makePaginationQueryも参照
--- a/packages/backend/src/core/PageService.ts
+++ b/packages/backend/src/core/PageService.ts
@@ -29,7 +29,7 @@ export interface PageBody {
 	variables: Array<Record<string, any>>;
 	script: string;
 	eyeCatchingImage?: MiDriveFile | null;
-	font: string;
+	font: 'serif' | 'sans-serif';
 	alignCenter: boolean;
 	hideTitleWhenPinned: boolean;
 }
@@ -141,7 +141,7 @@ export class PageService {
 				eyeCatchingImageId: body.eyeCatchingImage === undefined ? undefined : (body.eyeCatchingImage?.id ?? null),
 			});

-			console.log("page.content", page.content);
+			console.log('page.content', page.content);

 			if (body.content != null) {
 				const beforeReferencedNotes = this.collectReferencedNotes(page.content);
--- a/packages/backend/src/core/UtilityService.ts
+++ b/packages/backend/src/core/UtilityService.ts
@@ -133,6 +133,7 @@ export class UtilityService {

 	@bindThis
 	public isFederationAllowedHost(host: string): boolean {
+		if (this.isSelfHost(host)) return true;
 		if (this.meta.federation === 'none') return false;
 		if (this.meta.federation === 'specified' && !this.meta.federationHosts.some(x => `.${host.toLowerCase()}`.endsWith(`.${x}`))) return false;
 		if (this.isBlockedHost(this.meta.blockedHosts, host)) return false;
--- a/packages/backend/src/core/WebAuthnService.ts
+++ b/packages/backend/src/core/WebAuthnService.ts
@@ -66,7 +66,6 @@ export class WebAuthnService {
 			userID: isoUint8Array.fromUTF8String(userId),
 			userName: userName,
 			userDisplayName: userDisplayName,
-			attestationType: 'indirect',
 			excludeCredentials: keys.map(key => (<{ id: string; transports?: AuthenticatorTransportFuture[]; }>{
 				id: key.id,
 				transports: key.transports ?? undefined,
--- a/packages/backend/src/core/WebhookTestService.ts
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -106,6 +106,7 @@ function generateDummyNote(override?: Partial<MiNote>): MiNote {
 		replyUserHost: null,
 		renoteUserId: null,
 		renoteUserHost: null,
+		renoteChannelId: null,
 		...override,
 	};
 }
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -5,6 +5,7 @@

 import { Inject, Injectable } from '@nestjs/common';
 import { In } from 'typeorm';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
@@ -14,8 +15,8 @@ import { NotePiningService } from '@/core/NotePiningService.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
 import { NoteDeleteService } from '@/core/NoteDeleteService.js';
 import { NoteCreateService } from '@/core/NoteCreateService.js';
+import { acquireApObjectLock } from '@/misc/distributed-lock.js';
 import { concat, toArray, toSingle, unique } from '@/misc/prelude/array.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import type Logger from '@/logger.js';
 import { IdService } from '@/core/IdService.js';
 import { StatusError } from '@/misc/status-error.js';
@@ -48,8 +49,8 @@ export class ApInboxService {
 		@Inject(DI.config)
 		private config: Config,

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

 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
@@ -76,7 +77,6 @@ export class ApInboxService {
 		private userBlockingService: UserBlockingService,
 		private noteCreateService: NoteCreateService,
 		private noteDeleteService: NoteDeleteService,
-		private appLockService: AppLockService,
 		private apResolverService: ApResolverService,
 		private apDbResolverService: ApDbResolverService,
 		private apLoggerService: ApLoggerService,
@@ -311,7 +311,7 @@ export class ApInboxService {
 		// アナウンス先が許可されているかチェック
 		if (!this.utilityService.isFederationAllowedUri(uri)) return;

-		const unlock = await this.appLockService.getApLock(uri);
+		const unlock = await acquireApObjectLock(this.redisClient, uri);

 		try {
 			// 既に同じURIを持つものが登録されていないかチェック
@@ -438,7 +438,7 @@ export class ApInboxService {
 			}
 		}

-		const unlock = await this.appLockService.getApLock(uri);
+		const unlock = await acquireApObjectLock(this.redisClient, uri);

 		try {
 			const exist = await this.apNoteService.fetchNote(note);
@@ -522,7 +522,7 @@ export class ApInboxService {
 	private async deleteNote(actor: MiRemoteUser, uri: string): Promise<string> {
 		this.logger.info(`Deleting the Note: ${uri}`);

-		const unlock = await this.appLockService.getApLock(uri);
+		const unlock = await acquireApObjectLock(this.redisClient, uri);

 		try {
 			const note = await this.apDbResolverService.getNoteFromApId(uri);
--- a/packages/backend/src/core/activitypub/ApMfmService.ts
+++ b/packages/backend/src/core/activitypub/ApMfmService.ts
@@ -5,7 +5,7 @@

 import { Injectable } from '@nestjs/common';
 import * as mfm from 'mfm-js';
-import { MfmService, Appender } from '@/core/MfmService.js';
+import { MfmService } from '@/core/MfmService.js';
 import type { MiNote } from '@/models/Note.js';
 import { bindThis } from '@/decorators.js';
 import { extractApHashtagObjects } from './models/tag.js';
@@ -25,17 +25,17 @@ export class ApMfmService {
 	}

 	@bindThis
-	public getNoteHtml(note: Pick<MiNote, 'text' | 'mentionedRemoteUsers'>, additionalAppender: Appender[] = []) {
+	public getNoteHtml(note: Pick<MiNote, 'text' | 'mentionedRemoteUsers'>, extraHtml: string | null = null) {
 		let noMisskeyContent = false;
 		const srcMfm = (note.text ?? '');

 		const parsed = mfm.parse(srcMfm);

-		if (!additionalAppender.length && parsed.every(n => ['text', 'unicodeEmoji', 'emojiCode', 'mention', 'hashtag', 'url'].includes(n.type))) {
+		if (extraHtml == null && parsed.every(n => ['text', 'unicodeEmoji', 'emojiCode', 'mention', 'hashtag', 'url'].includes(n.type))) {
 			noMisskeyContent = true;
 		}

-		const content = this.mfmService.toHtml(parsed, JSON.parse(note.mentionedRemoteUsers), additionalAppender);
+		const content = this.mfmService.toHtml(parsed, JSON.parse(note.mentionedRemoteUsers), extraHtml);

 		return {
 			content,
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -19,7 +19,7 @@ import type { MiEmoji } from '@/models/Emoji.js';
 import type { MiPoll } from '@/models/Poll.js';
 import type { MiPollVote } from '@/models/PollVote.js';
 import { UserKeypairService } from '@/core/UserKeypairService.js';
-import { MfmService, type Appender } from '@/core/MfmService.js';
+import { MfmService } from '@/core/MfmService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import type { MiUserKeypair } from '@/models/UserKeypair.js';
@@ -28,6 +28,7 @@ import { bindThis } from '@/decorators.js';
 import { CustomEmojiService } from '@/core/CustomEmojiService.js';
 import { IdService } from '@/core/IdService.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { escapeHtml } from '@/misc/escape-html.js';
 import { JsonLdService } from './JsonLdService.js';
 import { ApMfmService } from './ApMfmService.js';
 import { CONTEXT } from './misc/contexts.js';
@@ -384,7 +385,7 @@ export class ApRendererService {
 			inReplyTo = null;
 		}

-		let quote;
+		let quote: string | undefined;

 		if (note.renoteId) {
 			const renote = await this.notesRepository.findOneBy({ id: note.renoteId });
@@ -430,29 +431,18 @@ export class ApRendererService {
 			poll = await this.pollsRepository.findOneBy({ noteId: note.id });
 		}

-		const apAppend: Appender[] = [];
+		let extraHtml: string | null = null;

-		if (quote) {
+		if (quote != null) {
 			// Append quote link as `<br><br><span class="quote-inline">RE: <a href="...">...</a></span>`
-			// the claas name `quote-inline` is used in non-misskey clients for styling quote notes.
+			// the class name `quote-inline` is used in non-misskey clients for styling quote notes.
 			// For compatibility, the span part should be kept as possible.
-			apAppend.push((doc, body) => {
-				body.appendChild(doc.createElement('br'));
-				body.appendChild(doc.createElement('br'));
-				const span = doc.createElement('span');
-				span.className = 'quote-inline';
-				span.appendChild(doc.createTextNode('RE: '));
-				const link = doc.createElement('a');
-				link.setAttribute('href', quote);
-				link.textContent = quote;
-				span.appendChild(link);
-				body.appendChild(span);
-			});
+			extraHtml = `<br><br><span class="quote-inline">RE: <a href="${escapeHtml(quote)}">${escapeHtml(quote)}</a></span>`;
 		}

 		const summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;

-		const { content, noMisskeyContent } = this.apMfmService.getNoteHtml(note, apAppend);
+		const { content, noMisskeyContent } = this.apMfmService.getNoteHtml(note, extraHtml);

 		const emojis = await this.getEmojis(note.emojis);
 		const apemojis = emojis.filter(emoji => !emoji.localOnly).map(emoji => this.renderEmoji(emoji));
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -6,7 +6,7 @@
 import * as crypto from 'node:crypto';
 import { URL } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
-import { Window } from 'happy-dom';
+import * as htmlParser from 'node-html-parser';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type { MiUser } from '@/models/User.js';
@@ -215,29 +215,9 @@ export class ApRequestService {
 			_followAlternate === true
 		) {
 			const html = await res.text();
-			const { window, happyDOM } = new Window({
-				settings: {
-					disableJavaScriptEvaluation: true,
-					disableJavaScriptFileLoading: true,
-					disableCSSFileLoading: true,
-					disableComputedStyleRendering: true,
-					handleDisabledFileLoadingAsSuccess: true,
-					navigation: {
-						disableMainFrameNavigation: true,
-						disableChildFrameNavigation: true,
-						disableChildPageNavigation: true,
-						disableFallbackToSetURL: true,
-					},
-					timer: {
-						maxTimeout: 0,
-						maxIntervalTime: 0,
-						maxIntervalIterations: 0,
-					},
-				},
-			});
-			const document = window.document;
+
 			try {
-				document.documentElement.innerHTML = html;
+				const document = htmlParser.parse(html);

 				const alternate = document.querySelector('head > link[rel="alternate"][type="application/activity+json"]');
 				if (alternate) {
@@ -248,8 +228,6 @@ export class ApRequestService {
 				}
 			} catch (e) {
 				// something went wrong parsing the HTML, ignore the whole thing
-			} finally {
-				happyDOM.close().catch(err => {});
 			}
 		}
 		//#endregion
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -5,14 +5,15 @@

 import { forwardRef, Inject, Injectable } from '@nestjs/common';
 import { In } from 'typeorm';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import type { PollsRepository, EmojisRepository, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
+import { acquireApObjectLock } from '@/misc/distributed-lock.js';
 import { toArray, toSingle, unique } from '@/misc/prelude/array.js';
 import type { MiEmoji } from '@/models/Emoji.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import { NoteCreateService } from '@/core/NoteCreateService.js';
 import type Logger from '@/logger.js';
@@ -48,6 +49,9 @@ export class ApNoteService {
 		@Inject(DI.meta)
 		private meta: MiMeta,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.pollsRepository)
 		private pollsRepository: PollsRepository,

@@ -67,7 +71,6 @@ export class ApNoteService {
 		private apMentionService: ApMentionService,
 		private apImageService: ApImageService,
 		private apQuestionService: ApQuestionService,
-		private appLockService: AppLockService,
 		private pollService: PollService,
 		private noteCreateService: NoteCreateService,
 		private apDbResolverService: ApDbResolverService,
@@ -354,7 +357,7 @@ export class ApNoteService {
 			throw new StatusError('blocked host', 451);
 		}

-		const unlock = await this.appLockService.getApLock(uri);
+		const unlock = await acquireApObjectLock(this.redisClient, uri);

 		try {
 			//#region このサーバーに既に登録されていたらそれを返す
--- a/packages/backend/src/core/chart/charts/active-users.ts
+++ b/packages/backend/src/core/chart/charts/active-users.ts
@@ -5,11 +5,12 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import { AppLockService } from '@/core/AppLockService.js';
+import * as Redis from 'ioredis';
 import type { MiUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/active-users.js';
@@ -28,11 +29,13 @@ export default class ActiveUsersChart extends Chart<typeof schema> { // eslint-d
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		private chartLoggerService: ChartLoggerService,
 		private idService: IdService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/ap-request.ts
+++ b/packages/backend/src/core/chart/charts/ap-request.ts
@@ -5,9 +5,10 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import { AppLockService } from '@/core/AppLockService.js';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/ap-request.js';
@@ -22,10 +23,12 @@ export default class ApRequestChart extends Chart<typeof schema> { // eslint-dis
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/drive.ts
+++ b/packages/backend/src/core/chart/charts/drive.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { MiDriveFile } from '@/models/DriveFile.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/drive.js';
@@ -23,10 +24,12 @@ export default class DriveChart extends Chart<typeof schema> { // eslint-disable
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/federation.ts
+++ b/packages/backend/src/core/chart/charts/federation.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { FollowingsRepository, InstancesRepository, MiMeta } from '@/models/_.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/federation.js';
@@ -26,16 +27,18 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 		@Inject(DI.meta)
 		private meta: MiMeta,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.followingsRepository)
 		private followingsRepository: FollowingsRepository,

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

-		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/instance.ts
+++ b/packages/backend/src/core/chart/charts/instance.ts
@@ -5,13 +5,14 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { DriveFilesRepository, FollowingsRepository, UsersRepository, NotesRepository } from '@/models/_.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import type { MiNote } from '@/models/Note.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/instance.js';
@@ -26,6 +27,9 @@ export default class InstanceChart extends Chart<typeof schema> { // eslint-disa
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

@@ -39,10 +43,9 @@ export default class InstanceChart extends Chart<typeof schema> { // eslint-disa
 		private followingsRepository: FollowingsRepository,

 		private utilityService: UtilityService,
-		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema, true);
 	}

 	protected async tickMajor(group: string): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/notes.ts
+++ b/packages/backend/src/core/chart/charts/notes.ts
@@ -5,11 +5,12 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { Not, IsNull, DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { NotesRepository } from '@/models/_.js';
 import type { MiNote } from '@/models/Note.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/notes.js';
@@ -24,13 +25,15 @@ export default class NotesChart extends Chart<typeof schema> { // eslint-disable
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

-		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/per-user-drive.ts
+++ b/packages/backend/src/core/chart/charts/per-user-drive.ts
@@ -5,12 +5,13 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { DriveFilesRepository } from '@/models/_.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/per-user-drive.js';
@@ -25,14 +26,16 @@ export default class PerUserDriveChart extends Chart<typeof schema> { // eslint-
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,

-		private appLockService: AppLockService,
 		private driveFileEntityService: DriveFileEntityService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema, true);
 	}

 	protected async tickMajor(group: string): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/per-user-following.ts
+++ b/packages/backend/src/core/chart/charts/per-user-following.ts
@@ -5,12 +5,13 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { Not, IsNull, DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { MiUser } from '@/models/User.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import type { FollowingsRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/per-user-following.js';
@@ -25,14 +26,16 @@ export default class PerUserFollowingChart extends Chart<typeof schema> { // esl
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.followingsRepository)
 		private followingsRepository: FollowingsRepository,

-		private appLockService: AppLockService,
 		private userEntityService: UserEntityService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema, true);
 	}

 	protected async tickMajor(group: string): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/per-user-notes.ts
+++ b/packages/backend/src/core/chart/charts/per-user-notes.ts
@@ -5,12 +5,13 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import type { NotesRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/per-user-notes.js';
@@ -25,13 +26,15 @@ export default class PerUserNotesChart extends Chart<typeof schema> { // eslint-
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

-		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema, true);
 	}

 	protected async tickMajor(group: string): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/per-user-pv.ts
+++ b/packages/backend/src/core/chart/charts/per-user-pv.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { MiUser } from '@/models/User.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/per-user-pv.js';
@@ -23,10 +24,12 @@ export default class PerUserPvChart extends Chart<typeof schema> { // eslint-dis
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema, true);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/per-user-reactions.ts
+++ b/packages/backend/src/core/chart/charts/per-user-reactions.ts
@@ -5,12 +5,13 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/per-user-reactions.js';
@@ -25,11 +26,13 @@ export default class PerUserReactionsChart extends Chart<typeof schema> { // esl
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		private userEntityService: UserEntityService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema, true);
 	}

 	protected async tickMajor(group: string): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/test-grouped.ts
+++ b/packages/backend/src/core/chart/charts/test-grouped.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import { AppLockService } from '@/core/AppLockService.js';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { name, schema } from './entities/test-grouped.js';
 import type { KVs } from '../core.js';
@@ -24,10 +25,12 @@ export default class TestGroupedChart extends Chart<typeof schema> { // eslint-d
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		logger: Logger,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), logger, name, schema, true);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), logger, name, schema, true);
 	}

 	protected async tickMajor(group: string): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/test-intersection.ts
+++ b/packages/backend/src/core/chart/charts/test-intersection.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import { AppLockService } from '@/core/AppLockService.js';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { name, schema } from './entities/test-intersection.js';
 import type { KVs } from '../core.js';
@@ -22,10 +23,12 @@ export default class TestIntersectionChart extends Chart<typeof schema> { // esl
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		logger: Logger,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/test-unique.ts
+++ b/packages/backend/src/core/chart/charts/test-unique.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import { AppLockService } from '@/core/AppLockService.js';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { name, schema } from './entities/test-unique.js';
 import type { KVs } from '../core.js';
@@ -22,10 +23,12 @@ export default class TestUniqueChart extends Chart<typeof schema> { // eslint-di
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		logger: Logger,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/test.ts
+++ b/packages/backend/src/core/chart/charts/test.ts
@@ -5,10 +5,11 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import { AppLockService } from '@/core/AppLockService.js';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { name, schema } from './entities/test.js';
 import type { KVs } from '../core.js';
@@ -24,10 +25,12 @@ export default class TestChart extends Chart<typeof schema> { // eslint-disable-
 		@Inject(DI.db)
 		private db: DataSource,

-		private appLockService: AppLockService,
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		logger: Logger,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/chart/charts/users.ts
+++ b/packages/backend/src/core/chart/charts/users.ts
@@ -5,12 +5,13 @@

 import { Injectable, Inject } from '@nestjs/common';
 import { Not, IsNull, DataSource } from 'typeorm';
+import * as Redis from 'ioredis';
 import type { MiUser } from '@/models/User.js';
-import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import type { UsersRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
+import { acquireChartInsertLock } from '@/misc/distributed-lock.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/users.js';
@@ -25,14 +26,16 @@ export default class UsersChart extends Chart<typeof schema> { // eslint-disable
 		@Inject(DI.db)
 		private db: DataSource,

+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,

-		private appLockService: AppLockService,
 		private userEntityService: UserEntityService,
 		private chartLoggerService: ChartLoggerService,
 	) {
-		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
+		super(db, (k) => acquireChartInsertLock(redisClient, k), chartLoggerService.logger, name, schema);
 	}

 	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
--- a/packages/backend/src/core/entities/ChannelEntityService.ts
+++ b/packages/backend/src/core/entities/ChannelEntityService.ts
@@ -4,36 +4,40 @@
 */

 import { Inject, Injectable } from '@nestjs/common';
+import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { ChannelFavoritesRepository, ChannelFollowingsRepository, ChannelsRepository, DriveFilesRepository, NotesRepository } from '@/models/_.js';
+import type {
+	ChannelFavoritesRepository,
+	ChannelFollowingsRepository, ChannelMutingRepository,
+	ChannelsRepository,
+	DriveFilesRepository,
+	MiDriveFile,
+	MiNote,
+	NotesRepository,
+} from '@/models/_.js';
 import type { Packed } from '@/misc/json-schema.js';
-import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiChannel } from '@/models/Channel.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
 import { DriveFileEntityService } from './DriveFileEntityService.js';
 import { NoteEntityService } from './NoteEntityService.js';
-import { In } from 'typeorm';

@Injectable()
 export class ChannelEntityService {
 	constructor(
 		@Inject(DI.channelsRepository)
 		private channelsRepository: ChannelsRepository,
-
 		@Inject(DI.channelFollowingsRepository)
 		private channelFollowingsRepository: ChannelFollowingsRepository,
-
 		@Inject(DI.channelFavoritesRepository)
 		private channelFavoritesRepository: ChannelFavoritesRepository,
-
+		@Inject(DI.channelMutingRepository)
+		private channelMutingRepository: ChannelMutingRepository,
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
-
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,
-
 		private noteEntityService: NoteEntityService,
 		private driveFileEntityService: DriveFileEntityService,
 		private idService: IdService,
@@ -45,31 +49,59 @@ export class ChannelEntityService {
 		src: MiChannel['id'] | MiChannel,
 		me?: { id: MiUser['id'] } | null | undefined,
 		detailed?: boolean,
+		opts?: {
+			bannerFiles?: Map<MiDriveFile['id'], MiDriveFile>;
+			followings?: Set<MiChannel['id']>;
+			favorites?: Set<MiChannel['id']>;
+			muting?: Set<MiChannel['id']>;
+			pinnedNotes?: Map<MiNote['id'], MiNote>;
+		},
 	): Promise<Packed<'Channel'>> {
 		const channel = typeof src === 'object' ? src : await this.channelsRepository.findOneByOrFail({ id: src });
-		const meId = me ? me.id : null;

-		const banner = channel.bannerId ? await this.driveFilesRepository.findOneBy({ id: channel.bannerId }) : null;
+		let bannerFile: MiDriveFile | null = null;
+		if (channel.bannerId) {
+			bannerFile = opts?.bannerFiles?.get(channel.bannerId)
+				?? await this.driveFilesRepository.findOneByOrFail({ id: channel.bannerId });
+		}

-		const isFollowing = meId ? await this.channelFollowingsRepository.exists({
-			where: {
-				followerId: meId,
-				followeeId: channel.id,
-			},
-		}) : false;
+		let isFollowing = false;
+		let isFavorited = false;
+		let isMuting = false;
+		if (me) {
+			isFollowing = opts?.followings?.has(channel.id) ?? await this.channelFollowingsRepository.exists({
+				where: {
+					followerId: me.id,
+					followeeId: channel.id,
+				},
+			});

-		const isFavorited = meId ? await this.channelFavoritesRepository.exists({
-			where: {
-				userId: meId,
-				channelId: channel.id,
-			},
-		}) : false;
+			isFavorited = opts?.favorites?.has(channel.id) ?? await this.channelFavoritesRepository.exists({
+				where: {
+					userId: me.id,
+					channelId: channel.id,
+				},
+			});

-		const pinnedNotes = channel.pinnedNoteIds.length > 0 ? await this.notesRepository.find({
-			where: {
-				id: In(channel.pinnedNoteIds),
-			},
-		}) : [];
+			isMuting = opts?.muting?.has(channel.id) ?? await this.channelMutingRepository.exists({
+				where: {
+					userId: me.id,
+					channelId: channel.id,
+				},
+			});
+		}
+
+		const pinnedNotes = Array.of<MiNote>();
+		if (channel.pinnedNoteIds.length > 0) {
+			pinnedNotes.push(
+				...(
+					opts?.pinnedNotes
+						// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+						? channel.pinnedNoteIds.map(it => opts.pinnedNotes!.get(it)).filter(it => it != null)
+						: await this.notesRepository.findBy({ id: In(channel.pinnedNoteIds) })
+				),
+			);
+		}

 		return {
 			id: channel.id,
@@ -78,7 +110,8 @@ export class ChannelEntityService {
 			name: channel.name,
 			description: channel.description,
 			userId: channel.userId,
-			bannerUrl: banner ? this.driveFileEntityService.getPublicUrl(banner) : null,
+			bannerUrl: bannerFile ? this.driveFileEntityService.getPublicUrl(bannerFile) : null,
+			bannerId: channel.bannerId,
 			pinnedNoteIds: channel.pinnedNoteIds,
 			color: channel.color,
 			isArchived: channel.isArchived,
@@ -90,6 +123,7 @@ export class ChannelEntityService {
 			...(me ? {
 				isFollowing,
 				isFavorited,
+				isMuting,
 				hasUnreadNote: false, // 後方互換性のため
 			} : {}),

@@ -98,5 +132,72 @@ export class ChannelEntityService {
 			} : {}),
 		};
 	}
+
+	@bindThis
+	public async packMany(
+		src: MiChannel['id'][] | MiChannel[],
+		me?: { id: MiUser['id'] } | null | undefined,
+		detailed?: boolean,
+	): Promise<Packed<'Channel'>[]> {
+		// IDのみの要素がある場合、DBからオブジェクトを取得して補う
+		const channels = src.filter(it => typeof it === 'object') as MiChannel[];
+		channels.push(
+			...(await this.channelsRepository.find({
+				where: {
+					id: In(src.filter(it => typeof it !== 'object') as MiChannel['id'][]),
+				},
+			})),
+		);
+		channels.sort((a, b) => a.id.localeCompare(b.id));
+
+		const bannerFiles = await this.driveFilesRepository
+			.findBy({
+				id: In(channels.map(it => it.bannerId).filter(it => it != null)),
+			})
+			.then(it => new Map(it.map(it => [it.id, it])));
+
+		const followings = me
+			? await this.channelFollowingsRepository
+				.findBy({
+					followerId: me.id,
+					followeeId: In(channels.map(it => it.id)),
+				})
+				.then(it => new Set(it.map(it => it.followeeId)))
+			: new Set<MiChannel['id']>();
+
+		const favorites = me
+			? await this.channelFavoritesRepository
+				.findBy({
+					userId: me.id,
+					channelId: In(channels.map(it => it.id)),
+				})
+				.then(it => new Set(it.map(it => it.channelId)))
+			: new Set<MiChannel['id']>();
+
+		const muting = me
+			? await this.channelMutingRepository
+				.findBy({
+					userId: me.id,
+					channelId: In(channels.map(it => it.id)),
+				})
+				.then(it => new Set(it.map(it => it.channelId)))
+			: new Set<MiChannel['id']>();
+
+		const pinnedNotes = await this.notesRepository
+			.find({
+				where: {
+					id: In(channels.flatMap(it => it.pinnedNoteIds)),
+				},
+			})
+			.then(it => new Map(it.map(it => [it.id, it])));
+
+		return Promise.all(channels.map(it => this.pack(it, me, detailed, {
+			bannerFiles,
+			followings,
+			favorites,
+			muting,
+			pinnedNotes,
+		})));
+	}
 }

--- a/packages/backend/src/di-symbols.ts
+++ b/packages/backend/src/di-symbols.ts
@@ -70,6 +70,7 @@ export const DI = {
 	channelsRepository: Symbol('channelsRepository'),
 	channelFollowingsRepository: Symbol('channelFollowingsRepository'),
 	channelFavoritesRepository: Symbol('channelFavoritesRepository'),
+	channelMutingRepository: Symbol('channelMutingRepository'),
 	registryItemsRepository: Symbol('registryItemsRepository'),
 	webhooksRepository: Symbol('webhooksRepository'),
 	systemWebhooksRepository: Symbol('systemWebhooksRepository'),
--- a/packages/backend/src/misc/distributed-lock.ts
+++ b/packages/backend/src/misc/distributed-lock.ts
@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as Redis from 'ioredis';
+
+export async function acquireDistributedLock(
+	redis: Redis.Redis,
+	name: string,
+	timeout: number,
+	maxRetries: number,
+	retryInterval: number,
+): Promise<() => Promise<void>> {
+	const lockKey = `lock:${name}`;
+	const identifier = Math.random().toString(36).slice(2);
+
+	let retries = 0;
+	while (retries < maxRetries) {
+		const result = await redis.set(lockKey, identifier, 'PX', timeout, 'NX');
+		if (result === 'OK') {
+			return async () => {
+				const currentIdentifier = await redis.get(lockKey);
+				if (currentIdentifier === identifier) {
+					await redis.del(lockKey);
+				}
+			};
+		}
+
+		await new Promise(resolve => setTimeout(resolve, retryInterval));
+		retries++;
+	}
+
+	throw new Error(`Failed to acquire lock ${name}`);
+}
+
+export function acquireApObjectLock(
+	redis: Redis.Redis,
+	uri: string,
+): Promise<() => Promise<void>> {
+	return acquireDistributedLock(redis, `ap-object:${uri}`, 30 * 1000, 50, 100);
+}
+
+export function acquireChartInsertLock(
+	redis: Redis.Redis,
+	name: string,
+): Promise<() => Promise<void>> {
+	return acquireDistributedLock(redis, `chart-insert:${name}`, 30 * 1000, 50, 500);
+}
--- a/packages/backend/src/misc/escape-html.ts
+++ b/packages/backend/src/misc/escape-html.ts
@@ -0,0 +1,13 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export function escapeHtml(text: string): string {
+	return text
+		.replace(/&/g, '&amp;')
+		.replace(/</g, '&lt;')
+		.replace(/>/g, '&gt;')
+		.replace(/"/g, '&quot;')
+		.replace(/'/g, '&#039;');
+}
--- a/packages/backend/src/misc/is-channel-related.ts
+++ b/packages/backend/src/misc/is-channel-related.ts
@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { MiNote } from '@/models/Note.js';
+import { Packed } from '@/misc/json-schema.js';
+
+/**
+ * {@link note}が{@link channelIds}のチャンネルに関連するかどうかを判定し、関連する場合はtrueを返します。
+ * 関連するというのは、{@link channelIds}のチャンネルに向けての投稿であるか、またはそのチャンネルの投稿をリノート・引用リノートした投稿であるかを指します。
+ *
+ * @param note 確認対象のノート
+ * @param channelIds 確認対象のチャンネルID一覧
+ * @param ignoreAuthor trueの場合、ノートの所属チャンネルが{@link channelIds}に含まれていても無視します（デフォルトはfalse）
+ */
+export function isChannelRelated(note: MiNote | Packed<'Note'>, channelIds: Set<string>, ignoreAuthor = false): boolean {
+	// ノートの所属チャンネルが確認対象のチャンネルID一覧に含まれている場合
+	if (!ignoreAuthor && note.channelId && channelIds.has(note.channelId)) {
+		return true;
+	}
+
+	const renoteChannelId = note.renote?.channelId;
+	if (renoteChannelId != null && renoteChannelId !== note.channelId && channelIds.has(renoteChannelId)) {
+		return true;
+	}
+
+	// NOTE: リプライはchannelIdのチェックだけでOKなはずなので見てない(チャンネルのノートにチャンネル外からのリプライまたはその逆はないはずなので）
+
+	return false;
+}
--- a/packages/backend/src/misc/json-stringify-html-safe.ts
+++ b/packages/backend/src/misc/json-stringify-html-safe.ts
@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+const ESCAPE_LOOKUP = {
+	'&': '\\u0026',
+	'>': '\\u003e',
+	'<': '\\u003c',
+	'\u2028': '\\u2028',
+	'\u2029': '\\u2029',
+} as Record<string, string>;
+
+const ESCAPE_REGEX = /[&><\u2028\u2029]/g;
+
+export function htmlSafeJsonStringify(obj: any): string {
+	return JSON.stringify(obj).replace(ESCAPE_REGEX, x => ESCAPE_LOOKUP[x]);
+}
--- a/packages/backend/src/models/ChannelMuting.ts
+++ b/packages/backend/src/models/ChannelMuting.ts
@@ -0,0 +1,46 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Column, Entity, Index, JoinColumn, ManyToOne, PrimaryColumn } from 'typeorm';
+import { id } from './util/id.js';
+import { MiUser } from './User.js';
+import { MiChannel } from './Channel.js';
+
+@Entity('channel_muting')
+@Index(['userId', 'channelId'], {})
+export class MiChannelMuting {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public userId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public user: MiUser | null;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public channelId: MiChannel['id'];
+
+	@ManyToOne(type => MiChannel, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public channel: MiChannel | null;
+
+	@Index()
+	@Column('timestamp with time zone', {
+		nullable: true,
+	})
+	public expiresAt: Date | null;
+}
--- a/packages/backend/src/models/Note.ts
+++ b/packages/backend/src/models/Note.ts
@@ -248,6 +248,14 @@ export class MiNote {
 	})
 	public renoteUserHost: string | null;

+	@Column({
+		...id(),
+		nullable: true,
+		comment: '[Denormalized]',
+	})
+	public renoteChannelId: MiChannel['id'] | null;
+	//#endregion
+
 	constructor(data: Partial<MiNote>) {
 		if (data == null) return;

--- a/packages/backend/src/models/Page.ts
+++ b/packages/backend/src/models/Page.ts
@@ -47,7 +47,7 @@ export class MiPage {
 	@Column('varchar', {
 		length: 32,
 	})
-	public font: string;
+	public font: 'serif' | 'sans-serif';

 	@Index()
 	@Column({
--- a/packages/backend/src/models/RepositoryModule.ts
+++ b/packages/backend/src/models/RepositoryModule.ts
@@ -21,6 +21,7 @@ import {
 	MiChannel,
 	MiChannelFavorite,
 	MiChannelFollowing,
+	MiChannelMuting,
 	MiClip,
 	MiClipFavorite,
 	MiClipNote,
@@ -429,6 +430,12 @@ const $channelFavoritesRepository: Provider = {
 	inject: [DI.db],
 };

+const $channelMutingRepository: Provider = {
+	provide: DI.channelMutingRepository,
+	useFactory: (db: DataSource) => db.getRepository(MiChannelMuting).extend(miRepository as MiRepository<MiChannelMuting>),
+	inject: [DI.db],
+};
+
 const $registryItemsRepository: Provider = {
 	provide: DI.registryItemsRepository,
 	useFactory: (db: DataSource) => db.getRepository(MiRegistryItem).extend(miRepository as MiRepository<MiRegistryItem>),
@@ -597,6 +604,7 @@ const $reversiGamesRepository: Provider = {
 		$channelsRepository,
 		$channelFollowingsRepository,
 		$channelFavoritesRepository,
+		$channelMutingRepository,
 		$registryItemsRepository,
 		$webhooksRepository,
 		$systemWebhooksRepository,
@@ -674,6 +682,7 @@ const $reversiGamesRepository: Provider = {
 		$channelsRepository,
 		$channelFollowingsRepository,
 		$channelFavoritesRepository,
+		$channelMutingRepository,
 		$registryItemsRepository,
 		$webhooksRepository,
 		$systemWebhooksRepository,
--- a/packages/backend/src/models/_.ts
+++ b/packages/backend/src/models/_.ts
@@ -5,18 +5,9 @@

 import {
 	FindOneOptions,
-	InsertQueryBuilder,
 	ObjectLiteral,
-	QueryRunner,
 	Repository,
-	SelectQueryBuilder,
 } from 'typeorm';
-import { PostgresConnectionOptions } from 'typeorm/driver/postgres/PostgresConnectionOptions.js';
-import { RelationCountLoader } from 'typeorm/query-builder/relation-count/RelationCountLoader.js';
-import { RelationIdLoader } from 'typeorm/query-builder/relation-id/RelationIdLoader.js';
-import {
-	RawSqlResultsToEntityTransformer,
-} from 'typeorm/query-builder/transformer/RawSqlResultsToEntityTransformer.js';
 import { MiAbuseReportNotificationRecipient } from '@/models/AbuseReportNotificationRecipient.js';
 import { MiAbuseUserReport } from '@/models/AbuseUserReport.js';
 import { MiAccessToken } from '@/models/AccessToken.js';
@@ -32,6 +23,7 @@ import { MiBubbleGameRecord } from '@/models/BubbleGameRecord.js';
 import { MiChannel } from '@/models/Channel.js';
 import { MiChannelFavorite } from '@/models/ChannelFavorite.js';
 import { MiChannelFollowing } from '@/models/ChannelFollowing.js';
+import { MiChannelMuting } from "@/models/ChannelMuting.js";
 import { MiChatApproval } from '@/models/ChatApproval.js';
 import { MiChatMessage } from '@/models/ChatMessage.js';
 import { MiChatRoom } from '@/models/ChatRoom.js';
@@ -95,66 +87,12 @@ import { MiWebhook } from '@/models/Webhook.js';
 import type { QueryDeepPartialEntity } from 'typeorm/query-builder/QueryPartialEntity.js';

 export interface MiRepository<T extends ObjectLiteral> {
-	createTableColumnNames(this: Repository<T> & MiRepository<T>): string[];
-
 	insertOne(this: Repository<T> & MiRepository<T>, entity: QueryDeepPartialEntity<T>, findOptions?: Pick<FindOneOptions<T>, 'relations'>): Promise<T>;
-
-	insertOneImpl(this: Repository<T> & MiRepository<T>, entity: QueryDeepPartialEntity<T>, findOptions?: Pick<FindOneOptions<T>, 'relations'>, queryRunner?: QueryRunner): Promise<T>;
-
-	selectAliasColumnNames(this: Repository<T> & MiRepository<T>, queryBuilder: InsertQueryBuilder<T>, builder: SelectQueryBuilder<T>): void;
 }

 export const miRepository = {
-	createTableColumnNames() {
-		return this.metadata.columns.filter(column => column.isSelect && !column.isVirtual).map(column => column.databaseName);
-	},
 	async insertOne(entity, findOptions?) {
-		const opt = this.manager.connection.options as PostgresConnectionOptions;
-		if (opt.replication) {
-			const queryRunner = this.manager.connection.createQueryRunner('master');
-			try {
-				return this.insertOneImpl(entity, findOptions, queryRunner);
-			} finally {
-				await queryRunner.release();
-			}
-		} else {
-			return this.insertOneImpl(entity, findOptions);
-		}
-	},
-	async insertOneImpl(entity, findOptions?, queryRunner?) {
-		// ---- insert + returningの結果を共通テーブル式(CTE)に保持するクエリを生成 ----
-
-		const queryBuilder = this.createQueryBuilder().insert().values(entity);
-		// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-		const mainAlias = queryBuilder.expressionMap.mainAlias!;
-		const name = mainAlias.name;
-		mainAlias.name = 't';
-		const columnNames = this.createTableColumnNames();
-		queryBuilder.returning(columnNames.reduce((a, c) => `${a}, ${queryBuilder.escape(c)}`, '').slice(2));
-
-		// ---- 共通テーブル式(CTE)から結果を取得 ----
-		const builder = this.createQueryBuilder(undefined, queryRunner).addCommonTableExpression(queryBuilder, 'cte', { columnNames });
-		// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-		builder.expressionMap.mainAlias!.tablePath = 'cte';
-		this.selectAliasColumnNames(queryBuilder, builder);
-		if (findOptions) {
-			builder.setFindOptions(findOptions);
-		}
-		const raw = await builder.execute();
-		mainAlias.name = name;
-		const relationId = await new RelationIdLoader(builder.connection, this.queryRunner, builder.expressionMap.relationIdAttributes).load(raw);
-		const relationCount = await new RelationCountLoader(builder.connection, this.queryRunner, builder.expressionMap.relationCountAttributes).load(raw);
-		const result = new RawSqlResultsToEntityTransformer(builder.expressionMap, builder.connection.driver, relationId, relationCount, this.queryRunner).transform(raw, mainAlias);
-		return result[0];
-	},
-	selectAliasColumnNames(queryBuilder, builder) {
-		let selectOrAddSelect = (selection: string, selectionAliasName?: string) => {
-			selectOrAddSelect = (selection, selectionAliasName) => builder.addSelect(selection, selectionAliasName);
-			return builder.select(selection, selectionAliasName);
-		};
-		for (const columnName of this.createTableColumnNames()) {
-			selectOrAddSelect(`${builder.alias}.${columnName}`, `${builder.alias}_${columnName}`);
-		}
+		return await this.insert(entity).then(x => this.findOneOrFail({ where: x.identifiers[0], ...findOptions }));
 	},
 } satisfies MiRepository<ObjectLiteral>;

@@ -172,6 +110,7 @@ export {
 	MiBlocking,
 	MiChannelFollowing,
 	MiChannelFavorite,
+	MiChannelMuting,
 	MiClip,
 	MiClipNote,
 	MiClipFavorite,
@@ -251,6 +190,7 @@ export type AuthSessionsRepository = Repository<MiAuthSession> & MiRepository<Mi
 export type BlockingsRepository = Repository<MiBlocking> & MiRepository<MiBlocking>;
 export type ChannelFollowingsRepository = Repository<MiChannelFollowing> & MiRepository<MiChannelFollowing>;
 export type ChannelFavoritesRepository = Repository<MiChannelFavorite> & MiRepository<MiChannelFavorite>;
+export type ChannelMutingRepository = Repository<MiChannelMuting> & MiRepository<MiChannelMuting>;
 export type ClipsRepository = Repository<MiClip> & MiRepository<MiClip>;
 export type ClipNotesRepository = Repository<MiClipNote> & MiRepository<MiClipNote>;
 export type ClipFavoritesRepository = Repository<MiClipFavorite> & MiRepository<MiClipFavorite>;
--- a/packages/backend/src/models/json-schema/channel.ts
+++ b/packages/backend/src/models/json-schema/channel.ts
@@ -40,6 +40,11 @@ export const packedChannelSchema = {
 			format: 'url',
 			nullable: true, optional: false,
 		},
+		bannerId: {
+			type: 'string',
+			nullable: true, optional: false,
+			format: 'id',
+		},
 		pinnedNoteIds: {
 			type: 'array',
 			nullable: false, optional: false,
@@ -80,6 +85,10 @@ export const packedChannelSchema = {
 			type: 'boolean',
 			optional: true, nullable: false,
 		},
+		isMuting: {
+			type: 'boolean',
+			optional: true, nullable: false,
+		},
 		pinnedNotes: {
 			type: 'array',
 			optional: true, nullable: false,
--- a/packages/backend/src/models/json-schema/page.ts
+++ b/packages/backend/src/models/json-schema/page.ts
@@ -174,6 +174,7 @@ export const packedPageSchema = {
 		font: {
 			type: 'string',
 			optional: false, nullable: false,
+			enum: ['serif', 'sans-serif'],
 		},
 		script: {
 			type: 'string',
--- a/packages/backend/src/postgres.ts
+++ b/packages/backend/src/postgres.ts
@@ -6,7 +6,6 @@
 // https://github.com/typeorm/typeorm/issues/2400
 import pg from 'pg';
 import { DataSource, Logger, type QueryRunner } from 'typeorm';
-import * as highlight from 'cli-highlight';
 import { entities as charts } from '@/core/chart/entities.js';
 import { Config } from '@/config.js';
 import MisskeyLogger from '@/logger.js';
@@ -25,6 +24,7 @@ import { MiAuthSession } from '@/models/AuthSession.js';
 import { MiBlocking } from '@/models/Blocking.js';
 import { MiChannelFollowing } from '@/models/ChannelFollowing.js';
 import { MiChannelFavorite } from '@/models/ChannelFavorite.js';
+import { MiChannelMuting } from '@/models/ChannelMuting.js';
 import { MiClip } from '@/models/Clip.js';
 import { MiClipNote } from '@/models/ClipNote.js';
 import { MiClipFavorite } from '@/models/ClipFavorite.js';
@@ -100,12 +100,6 @@ export type LoggerProps = {
 	printReplicationMode?: boolean,
 };

-function highlightSql(sql: string) {
-	return highlight.highlight(sql, {
-		language: 'sql', ignoreIllegals: true,
-	});
-}
-
 function truncateSql(sql: string) {
 	return sql.length > 100 ? `${sql.substring(0, 100)}...` : sql;
 }
@@ -131,7 +125,7 @@ class MyCustomLogger implements Logger {
 			modded = truncateSql(modded);
 		}

-		return highlightSql(modded);
+		return modded;
 	}

 	@bindThis
@@ -239,6 +233,7 @@ export const entities = [
 	MiChannel,
 	MiChannelFollowing,
 	MiChannelFavorite,
+	MiChannelMuting,
 	MiRegistryItem,
 	MiAd,
 	MiPasswordResetRequest,
--- a/packages/backend/src/queue/QueueProcessorService.ts
+++ b/packages/backend/src/queue/QueueProcessorService.ts
@@ -5,7 +5,6 @@

 import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
 import * as Bull from 'bullmq';
-import * as Sentry from '@sentry/node';
 import type { Config } from '@/config.js';
 import { DI } from '@/di-symbols.js';
 import type Logger from '@/logger.js';
@@ -157,6 +156,13 @@ export class QueueProcessorService implements OnApplicationShutdown {
 			};
 		}

+		let Sentry: typeof import('@sentry/node') | undefined;
+		if (Sentry != null) {
+			import('@sentry/node').then((mod) => {
+				Sentry = mod;
+			});
+		}
+
 		//#region system
 		{
 			const processer = (job: Bull.Job) => {
@@ -175,7 +181,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 			};

 			this.systemQueueWorker = new Bull.Worker(QUEUE.SYSTEM, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: System: ' + job.name }, () => processer(job));
 				} else {
 					return processer(job);
@@ -192,7 +198,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) id=${job.id}`))
 				.on('failed', (job, err: Error) => {
 					logger.error(`failed(${err.name}: ${err.message}) id=${job?.id ?? '?'}`, { job: renderJob(job), e: renderError(err) });
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: System: ${job?.name ?? '?'}: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -232,7 +238,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 			};

 			this.dbQueueWorker = new Bull.Worker(QUEUE.DB, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: DB: ' + job.name }, () => processer(job));
 				} else {
 					return processer(job);
@@ -249,7 +255,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) id=${job.id}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) id=${job?.id ?? '?'}`, { job: renderJob(job), e: renderError(err) });
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: DB: ${job?.name ?? '?'}: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -264,7 +270,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		//#region deliver
 		{
 			this.deliverQueueWorker = new Bull.Worker(QUEUE.DELIVER, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: Deliver' }, () => this.deliverProcessorService.process(job));
 				} else {
 					return this.deliverProcessorService.process(job);
@@ -289,7 +295,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) ${getJobInfo(job, true)} to=${job.data.to}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) ${getJobInfo(job)} to=${job ? job.data.to : '-'}`);
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: Deliver: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -304,7 +310,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		//#region inbox
 		{
 			this.inboxQueueWorker = new Bull.Worker(QUEUE.INBOX, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: Inbox' }, () => this.inboxProcessorService.process(job));
 				} else {
 					return this.inboxProcessorService.process(job);
@@ -329,7 +335,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) ${getJobInfo(job, true)}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) ${getJobInfo(job)} activity=${job ? (job.data.activity ? job.data.activity.id : 'none') : '-'}`, { job: renderJob(job), e: renderError(err) });
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: Inbox: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -344,7 +350,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		//#region user-webhook deliver
 		{
 			this.userWebhookDeliverQueueWorker = new Bull.Worker(QUEUE.USER_WEBHOOK_DELIVER, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: UserWebhookDeliver' }, () => this.userWebhookDeliverProcessorService.process(job));
 				} else {
 					return this.userWebhookDeliverProcessorService.process(job);
@@ -369,7 +375,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) ${getJobInfo(job, true)} to=${job.data.to}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) ${getJobInfo(job)} to=${job ? job.data.to : '-'}`);
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: UserWebhookDeliver: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -384,7 +390,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		//#region system-webhook deliver
 		{
 			this.systemWebhookDeliverQueueWorker = new Bull.Worker(QUEUE.SYSTEM_WEBHOOK_DELIVER, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: SystemWebhookDeliver' }, () => this.systemWebhookDeliverProcessorService.process(job));
 				} else {
 					return this.systemWebhookDeliverProcessorService.process(job);
@@ -409,7 +415,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) ${getJobInfo(job, true)} to=${job.data.to}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) ${getJobInfo(job)} to=${job ? job.data.to : '-'}`);
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: SystemWebhookDeliver: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -434,7 +440,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 			};

 			this.relationshipQueueWorker = new Bull.Worker(QUEUE.RELATIONSHIP, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: Relationship: ' + job.name }, () => processer(job));
 				} else {
 					return processer(job);
@@ -456,7 +462,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) id=${job.id}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) id=${job?.id ?? '?'}`, { job: renderJob(job), e: renderError(err) });
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: Relationship: ${job?.name ?? '?'}: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -479,7 +485,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 			};

 			this.objectStorageQueueWorker = new Bull.Worker(QUEUE.OBJECT_STORAGE, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: ObjectStorage: ' + job.name }, () => processer(job));
 				} else {
 					return processer(job);
@@ -497,7 +503,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 				.on('completed', (job, result) => logger.debug(`completed(${result}) id=${job.id}`))
 				.on('failed', (job, err) => {
 					logger.error(`failed(${err.name}: ${err.message}) id=${job?.id ?? '?'}`, { job: renderJob(job), e: renderError(err) });
-					if (config.sentryForBackend) {
+					if (Sentry != null) {
 						Sentry.captureMessage(`Queue: ObjectStorage: ${job?.name ?? '?'}: ${err.name}: ${err.message}`, {
 							level: 'error',
 							extra: { job, err },
@@ -512,7 +518,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		//#region ended poll notification
 		{
 			this.endedPollNotificationQueueWorker = new Bull.Worker(QUEUE.ENDED_POLL_NOTIFICATION, (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: EndedPollNotification' }, () => this.endedPollNotificationProcessorService.process(job));
 				} else {
 					return this.endedPollNotificationProcessorService.process(job);
@@ -527,7 +533,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		//#region post scheduled note
 		{
 			this.postScheduledNoteQueueWorker = new Bull.Worker(QUEUE.POST_SCHEDULED_NOTE, async (job) => {
-				if (this.config.sentryForBackend) {
+				if (Sentry != null) {
 					return Sentry.startSpan({ name: 'Queue: PostScheduledNote' }, () => this.postScheduledNoteProcessorService.process(job));
 				} else {
 					return this.postScheduledNoteProcessorService.process(job);
--- a/packages/backend/src/queue/processors/CheckExpiredMutingsProcessorService.ts
+++ b/packages/backend/src/queue/processors/CheckExpiredMutingsProcessorService.ts
@@ -4,14 +4,13 @@
 */

 import { Inject, Injectable } from '@nestjs/common';
-import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
 import type { MutingsRepository } from '@/models/_.js';
 import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
 import { UserMutingService } from '@/core/UserMutingService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
-import type * as Bull from 'bullmq';

@Injectable()
 export class CheckExpiredMutingsProcessorService {
@@ -22,6 +21,7 @@ export class CheckExpiredMutingsProcessorService {
 		private mutingsRepository: MutingsRepository,

 		private userMutingService: UserMutingService,
+		private channelMutingService: ChannelMutingService,
 		private queueLoggerService: QueueLoggerService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('check-expired-mutings');
@@ -41,6 +41,8 @@ export class CheckExpiredMutingsProcessorService {
 			await this.userMutingService.unmute(expired);
 		}

+		await this.channelMutingService.eraseExpiredMutings();
+
 		this.logger.succ('All expired mutings checked.');
 	}
 }
--- a/packages/backend/src/queue/processors/CleanRemoteNotesProcessorService.ts
+++ b/packages/backend/src/queue/processors/CleanRemoteNotesProcessorService.ts
@@ -51,6 +51,17 @@ export class CleanRemoteNotesProcessorService {
 		skipped: boolean;
 		transientErrors: number;
 	}> {
+		const getConfig = () => {
+			return {
+				enabled: this.meta.enableRemoteNotesCleaning,
+				maxDuration: this.meta.remoteNotesCleaningMaxProcessingDurationInMinutes * 60 * 1000, // Convert minutes to milliseconds
+				// The date limit for the newest note to be considered for deletion.
+				// All notes newer than this limit will always be retained.
+				newestLimit: this.idService.gen(Date.now() - (1000 * 60 * 60 * 24 * this.meta.remoteNotesCleaningExpiryDaysForEachNotes)),
+			};
+		};
+
+		const initialConfig = getConfig();
 		if (!this.meta.enableRemoteNotesCleaning) {
 			this.logger.info('Remote notes cleaning is disabled, skipping...');
 			return {
@@ -64,13 +75,9 @@ export class CleanRemoteNotesProcessorService {

 		this.logger.info('cleaning remote notes...');

-		const maxDuration = this.meta.remoteNotesCleaningMaxProcessingDurationInMinutes * 60 * 1000; // Convert minutes to milliseconds
 		const startAt = Date.now();

 		//#region queries
-		// The date limit for the newest note to be considered for deletion.
-		// All notes newer than this limit will always be retained.
-		const newestLimit = this.idService.gen(Date.now() - (1000 * 60 * 60 * 24 * this.meta.remoteNotesCleaningExpiryDaysForEachNotes));

 		// The condition for removing the notes.
 		// The note must be:
@@ -92,7 +99,7 @@ export class CleanRemoteNotesProcessorService {
 		const minId = (await this.notesRepository.createQueryBuilder('note')
 			.select('MIN(note.id)', 'minId')
 			.where({
-				id: LessThan(newestLimit),
+				id: LessThan(initialConfig.newestLimit),
 				userHost: Not(IsNull()),
 				replyId: IsNull(),
 				renoteId: IsNull(),
@@ -155,12 +162,12 @@ export class CleanRemoteNotesProcessorService {
 		// | fff | fff    | TRUE        |
 		// | ggg | ggg    | FALSE       |
 		//
-		const candidateNotesQuery = this.db.createQueryBuilder()
+		const candidateNotesQuery = ({ limit }: { limit: number }) => this.db.createQueryBuilder()
 			.select(`"${candidateNotesCteName}"."id"`, 'id')
 			.addSelect('unremovable."id" IS NULL', 'isRemovable')
 			.addSelect(`BOOL_OR("${candidateNotesCteName}"."isBase")`, 'isBase')
 			.addCommonTableExpression(
-				`((SELECT "base".* FROM (${candidateNotesQueryBase.orderBy('note.id', 'ASC').limit(currentLimit).getQuery()}) AS "base") UNION ${candidateNotesQueryInductive.getQuery()})`,
+				`((SELECT "base".* FROM (${candidateNotesQueryBase.orderBy('note.id', 'ASC').limit(limit).getQuery()}) AS "base") UNION ${candidateNotesQueryInductive.getQuery()})`,
 				candidateNotesCteName,
 				{ recursive: true },
 			)
@@ -178,6 +185,11 @@ export class CleanRemoteNotesProcessorService {
 		let lowThroughputWarned = false;
 		let transientErrors = 0;
 		for (;;) {
+			const { enabled, maxDuration, newestLimit } = getConfig();
+			if (!enabled) {
+				this.logger.info('Remote notes cleaning is disabled, processing stopped...');
+				break;
+			}
 			//#region check time
 			const batchBeginAt = Date.now();

@@ -205,13 +217,38 @@ export class CleanRemoteNotesProcessorService {
 			let noteIds = null;

 			try {
-				noteIds = await candidateNotesQuery.setParameters(
+				noteIds = await candidateNotesQuery({ limit: currentLimit }).setParameters(
 					{ newestLimit, cursorLeft },
 				).getRawMany<{ id: MiNote['id'], isRemovable: boolean, isBase: boolean }>();
 			} catch (e) {
-				if (currentLimit > minimumLimit && e instanceof QueryFailedError && e.driverError?.code === '57014') {
-					// Statement timeout (maybe suddenly hit a large note tree), reduce the limit and try again
-					// continuous failures will eventually converge to currentLimit == minimumLimit and then throw
+				if (e instanceof QueryFailedError && e.driverError?.code === '57014') {
+					// Statement timeout (maybe suddenly hit a large note tree), if possible, reduce the limit and try again
+					// if not possible, skip the current batch of notes and find the next root note
+					if (currentLimit <= minimumLimit) {
+						job.log('Local note tree complexity is too high, finding next root note...');
+
+						const idWindow = await this.notesRepository.createQueryBuilder('note')
+							.select('id')
+							.where('note.id > :cursorLeft')
+							.andWhere(removalCriteria)
+							.andWhere({ replyId: IsNull(), renoteId: IsNull() })
+							.orderBy('note.id', 'ASC')
+							.limit(minimumLimit + 1)
+							.setParameters({ cursorLeft, newestLimit })
+							.getRawMany<{ id?: MiNote['id'] }>();
+
+						job.log(`Skipped note IDs: ${idWindow.slice(0, minimumLimit).map(id => id.id).join(', ')}`);
+
+						const lastId = idWindow.at(minimumLimit)?.id;
+
+						if (!lastId) {
+							job.log('No more notes to clean.');
+							break;
+						}
+
+						cursorLeft = lastId;
+						continue;
+					}
 					currentLimit = Math.max(minimumLimit, Math.floor(currentLimit * 0.25));
 					continue;
 				}
--- a/packages/backend/src/server/ServerModule.ts
+++ b/packages/backend/src/server/ServerModule.ts
@@ -25,6 +25,7 @@ import { SignupApiService } from './api/SignupApiService.js';
 import { StreamingApiServerService } from './api/StreamingApiServerService.js';
 import { OpenApiServerService } from './api/openapi/OpenApiServerService.js';
 import { ClientServerService } from './web/ClientServerService.js';
+import { HtmlTemplateService } from './web/HtmlTemplateService.js';
 import { FeedService } from './web/FeedService.js';
 import { UrlPreviewService } from './web/UrlPreviewService.js';
 import { ClientLoggerService } from './web/ClientLoggerService.js';
@@ -58,6 +59,7 @@ import { SigninWithPasskeyApiService } from './api/SigninWithPasskeyApiService.j
 	providers: [
 		ClientServerService,
 		ClientLoggerService,
+		HtmlTemplateService,
 		FeedService,
 		HealthServerService,
 		UrlPreviewService,
--- a/packages/backend/src/server/ServerService.ts
+++ b/packages/backend/src/server/ServerService.ts
@@ -75,7 +75,7 @@ export class ServerService implements OnApplicationShutdown {
 	@bindThis
 	public async launch(): Promise<void> {
 		const fastify = Fastify({
-			trustProxy: this.config.trustProxy ?? true,
+			trustProxy: this.config.trustProxy ?? false,
 			logger: false,
 		});
 		this.#fastify = fastify;
--- a/packages/backend/src/server/api/ApiCallService.ts
+++ b/packages/backend/src/server/api/ApiCallService.ts
@@ -7,7 +7,6 @@ import { randomUUID } from 'node:crypto';
 import * as fs from 'node:fs';
 import * as stream from 'node:stream/promises';
 import { Inject, Injectable } from '@nestjs/common';
-import * as Sentry from '@sentry/node';
 import { DI } from '@/di-symbols.js';
 import { getIpHash } from '@/misc/get-ip-hash.js';
 import type { MiLocalUser, MiUser } from '@/models/User.js';
@@ -37,6 +36,7 @@ export class ApiCallService implements OnApplicationShutdown {
 	private logger: Logger;
 	private userIpHistories: Map<MiUser['id'], Set<string>>;
 	private userIpHistoriesClearIntervalId: NodeJS.Timeout;
+	private Sentry: typeof import('@sentry/node') | null = null;

 	constructor(
 		@Inject(DI.meta)
@@ -59,6 +59,12 @@ export class ApiCallService implements OnApplicationShutdown {
 		this.userIpHistoriesClearIntervalId = setInterval(() => {
 			this.userIpHistories.clear();
 		}, 1000 * 60 * 60);
+
+		if (this.config.sentryForBackend) {
+			import('@sentry/node').then((Sentry) => {
+				this.Sentry = Sentry;
+			});
+		}
 	}

 	#sendApiError(reply: FastifyReply, err: ApiError): void {
@@ -120,8 +126,8 @@ export class ApiCallService implements OnApplicationShutdown {
 				},
 			});

-			if (this.config.sentryForBackend) {
-				Sentry.captureMessage(`Internal error occurred in ${ep.name}: ${err.message}`, {
+			if (this.Sentry != null) {
+				this.Sentry.captureMessage(`Internal error occurred in ${ep.name}: ${err.message}`, {
 					level: 'error',
 					user: {
 						id: userId,
@@ -432,8 +438,8 @@ export class ApiCallService implements OnApplicationShutdown {
 		}

 		// API invoking
-		if (this.config.sentryForBackend) {
-			return await Sentry.startSpan({
+		if (this.Sentry != null) {
+			return await this.Sentry.startSpan({
 				name: 'API: ' + ep.name,
 			}, () => ep.exec(data, user, token, file, request.ip, request.headers)
 				.catch((err: Error) => this.#onExecError(ep, data, err, user?.id)));
--- a/packages/backend/src/server/api/StreamingApiServerService.ts
+++ b/packages/backend/src/server/api/StreamingApiServerService.ts
@@ -15,6 +15,7 @@ import { CacheService } from '@/core/CacheService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { UserService } from '@/core/UserService.js';
 import { ChannelFollowingService } from '@/core/ChannelFollowingService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { AuthenticateService, AuthenticationError } from './AuthenticateService.js';
 import MainStreamConnection from './stream/Connection.js';
 import { ChannelsService } from './stream/ChannelsService.js';
@@ -39,6 +40,7 @@ export class StreamingApiServerService {
 		private notificationService: NotificationService,
 		private usersService: UserService,
 		private channelFollowingService: ChannelFollowingService,
+		private channelMutingService: ChannelMutingService,
 	) {
 	}

@@ -97,6 +99,7 @@ export class StreamingApiServerService {
 				this.notificationService,
 				this.cacheService,
 				this.channelFollowingService,
+				this.channelMutingService,
 				user, app,
 			);

--- a/packages/backend/src/server/api/endpoint-list.ts
+++ b/packages/backend/src/server/api/endpoint-list.ts
@@ -143,6 +143,9 @@ export * as 'channels/timeline' from './endpoints/channels/timeline.js';
 export * as 'channels/unfavorite' from './endpoints/channels/unfavorite.js';
 export * as 'channels/unfollow' from './endpoints/channels/unfollow.js';
 export * as 'channels/update' from './endpoints/channels/update.js';
+export * as 'channels/mute/create' from './endpoints/channels/mute/create.js';
+export * as 'channels/mute/delete' from './endpoints/channels/mute/delete.js';
+export * as 'channels/mute/list' from './endpoints/channels/mute/list.js';
 export * as 'charts/active-users' from './endpoints/charts/active-users.js';
 export * as 'charts/ap-request' from './endpoints/charts/ap-request.js';
 export * as 'charts/drive' from './endpoints/charts/drive.js';
--- a/packages/backend/src/server/api/endpoints/antennas/notes.ts
+++ b/packages/backend/src/server/api/endpoints/antennas/notes.ts
@@ -5,6 +5,7 @@

 import { Inject, Injectable } from '@nestjs/common';
 import * as Redis from 'ioredis';
+import { Brackets } from 'typeorm';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { NotesRepository, AntennasRepository } from '@/models/_.js';
 import { QueryService } from '@/core/QueryService.js';
@@ -14,6 +15,7 @@ import { IdService } from '@/core/IdService.js';
 import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { trackPromise } from '@/misc/promise-tracker.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@@ -69,6 +71,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private queryService: QueryService,
 		private fanoutTimelineService: FanoutTimelineService,
 		private globalEventService: GlobalEventService,
+		private channelMutingService: ChannelMutingService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -108,6 +111,21 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				.leftJoinAndSelect('reply.user', 'replyUser')
 				.leftJoinAndSelect('renote.user', 'renoteUser');

+			// -- ミュートされたチャンネル対策
+			const mutingChannelIds = await this.channelMutingService
+				.list({ requestUserId: me.id }, { idOnly: true })
+				.then(x => x.map(x => x.id));
+			if (mutingChannelIds.length > 0) {
+				query.andWhere(new Brackets(qb => {
+					qb.orWhere('note.channelId IS NULL');
+					qb.orWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+				}));
+				query.andWhere(new Brackets(qb => {
+					qb.orWhere('note.renoteChannelId IS NULL');
+					qb.orWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+				}));
+			}
+
 			// NOTE: センシティブ除外の設定はこのエンドポイントでは無視する。
 			// https://github.com/misskey-dev/misskey/pull/15346#discussion_r1929950255

--- a/packages/backend/src/server/api/endpoints/channels/create.ts
+++ b/packages/backend/src/server/api/endpoints/channels/create.ts
@@ -46,7 +46,7 @@ export const paramDef = {
 	type: 'object',
 	properties: {
 		name: { type: 'string', minLength: 1, maxLength: 128 },
-		description: { type: 'string', nullable: true, minLength: 1, maxLength: 2048 },
+		description: { type: 'string', nullable: true, maxLength: 2048 },
 		bannerId: { type: 'string', format: 'misskey:id', nullable: true },
 		color: { type: 'string', minLength: 1, maxLength: 16 },
 		isSensitive: { type: 'boolean', nullable: true },
--- a/packages/backend/src/server/api/endpoints/channels/mute/create.ts
+++ b/packages/backend/src/server/api/endpoints/channels/mute/create.ts
@@ -0,0 +1,90 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import type { ChannelsRepository } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+import { ApiError } from '@/server/api/error.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+
+export const meta = {
+	tags: ['channels', 'mute'],
+
+	requireCredential: true,
+	prohibitMoved: true,
+
+	kind: 'write:channels',
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such Channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: '7174361e-d58f-31d6-2e7c-6fb830786a3f',
+		},
+
+		alreadyMuting: {
+			message: 'You are already muting that user.',
+			code: 'ALREADY_MUTING_CHANNEL',
+			id: '5a251978-769a-da44-3e89-3931e43bb592',
+		},
+
+		expiresAtIsPast: {
+			message: 'Cannot set past date to "expiresAt".',
+			code: 'EXPIRES_AT_IS_PAST',
+			id: '42b32236-df2c-a45f-fdbf-def67268f749',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		channelId: { type: 'string', format: 'misskey:id' },
+		expiresAt: {
+			type: 'integer',
+			nullable: true,
+			description: 'A Unix Epoch timestamp that must lie in the future. `null` means an indefinite mute.',
+		},
+	},
+	required: ['channelId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
+		private channelMutingService: ChannelMutingService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			// Check if exists the channel
+			const targetChannel = await this.channelsRepository.findOneBy({ id: ps.channelId });
+			if (!targetChannel) {
+				throw new ApiError(meta.errors.noSuchChannel);
+			}
+
+			// Check if already muting
+			const exist = await this.channelMutingService.isMuted({
+				requestUserId: me.id,
+				targetChannelId: targetChannel.id,
+			});
+			if (exist) {
+				throw new ApiError(meta.errors.alreadyMuting);
+			}
+
+			// Check if expiresAt is past
+			if (ps.expiresAt && ps.expiresAt <= Date.now()) {
+				throw new ApiError(meta.errors.expiresAtIsPast);
+			}
+
+			await this.channelMutingService.mute({
+				requestUserId: me.id,
+				targetChannelId: targetChannel.id,
+				expiresAt: ps.expiresAt ? new Date(ps.expiresAt) : null,
+			});
+		});
+	}
+}
--- a/packages/backend/src/server/api/endpoints/channels/mute/delete.ts
+++ b/packages/backend/src/server/api/endpoints/channels/mute/delete.ts
@@ -0,0 +1,73 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import type { ChannelsRepository } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['channels', 'mute'],
+
+	requireCredential: true,
+	prohibitMoved: true,
+
+	kind: 'write:channels',
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such Channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: 'e7998769-6e94-d9c2-6b8f-94a527314aba',
+		},
+
+		notMuting: {
+			message: 'You are not muting that channel.',
+			code: 'NOT_MUTING_CHANNEL',
+			id: '14d55962-6ea8-d990-1333-d6bef78dc2ab',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		channelId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['channelId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
+		private channelMutingService: ChannelMutingService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			// Check if exists the channel
+			const targetChannel = await this.channelsRepository.findOneBy({ id: ps.channelId });
+			if (!targetChannel) {
+				throw new ApiError(meta.errors.noSuchChannel);
+			}
+
+			// Check muting
+			const exist = await this.channelMutingService.isMuted({
+				requestUserId: me.id,
+				targetChannelId: targetChannel.id,
+			});
+			if (!exist) {
+				throw new ApiError(meta.errors.notMuting);
+			}
+
+			await this.channelMutingService.unmute({
+				requestUserId: me.id,
+				targetChannelId: targetChannel.id,
+			});
+		});
+	}
+}
--- a/packages/backend/src/server/api/endpoints/channels/mute/list.ts
+++ b/packages/backend/src/server/api/endpoints/channels/mute/list.ts
@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+import { ChannelEntityService } from '@/core/entities/ChannelEntityService.js';
+
+export const meta = {
+	tags: ['channels', 'mute'],
+
+	requireCredential: true,
+	prohibitMoved: true,
+
+	kind: 'read:channels',
+
+	res: {
+		type: 'array',
+		optional: false, nullable: false,
+		items: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'Channel',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private channelMutingService: ChannelMutingService,
+		private channelEntityService: ChannelEntityService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const mutings = await this.channelMutingService.list({
+				requestUserId: me.id,
+			});
+			return await this.channelEntityService.packMany(mutings, me);
+		});
+	}
+}
--- a/packages/backend/src/server/api/endpoints/channels/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/channels/timeline.ts
@@ -13,6 +13,7 @@ import { DI } from '@/di-symbols.js';
 import { IdService } from '@/core/IdService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { MiLocalUser } from '@/models/User.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@@ -70,6 +71,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private queryService: QueryService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private activeUsersChart: ActiveUsersChart,
+		private channelMutingService: ChannelMutingService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -98,6 +100,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				useDbFallback: true,
 				redisTimelines: [`channelTimeline:${channel.id}`],
 				excludePureRenotes: false,
+				ignoreAuthorChannelFromMute: true,
 				dbFallback: async (untilId, sinceId, limit) => {
 					return await this.getFromDb({ untilId, sinceId, limit, channelId: channel.id }, me);
 				},
@@ -122,6 +125,16 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			.leftJoinAndSelect('note.channel', 'channel');

 		this.queryService.generateBaseNoteFilteringQuery(query, me);
+
+		if (me) {
+			const mutingChannelIds = await this.channelMutingService
+				.list({ requestUserId: me.id }, { idOnly: true })
+				.then(x => x.map(x => x.id).filter(x => x !== ps.channelId));
+			if (mutingChannelIds.length > 0) {
+				query.andWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+				query.andWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+			}
+		}
 		//#endregion

 		return await query.limit(ps.limit).getMany();
--- a/packages/backend/src/server/api/endpoints/channels/update.ts
+++ b/packages/backend/src/server/api/endpoints/channels/update.ts
@@ -50,7 +50,7 @@ export const paramDef = {
 	properties: {
 		channelId: { type: 'string', format: 'misskey:id' },
 		name: { type: 'string', minLength: 1, maxLength: 128 },
-		description: { type: 'string', nullable: true, minLength: 1, maxLength: 2048 },
+		description: { type: 'string', nullable: true, maxLength: 2048 },
 		bannerId: { type: 'string', format: 'misskey:id', nullable: true },
 		isArchived: { type: 'boolean', nullable: true },
 		pinnedNoteIds: {
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -7,7 +7,7 @@ import RE2 from 're2';
 import * as mfm from 'mfm-js';
 import { Inject, Injectable } from '@nestjs/common';
 import ms from 'ms';
-import { JSDOM } from 'jsdom';
+import * as htmlParser from 'node-html-parser';
 import { extractCustomEmojisFromMfm } from '@/misc/extract-custom-emojis-from-mfm.js';
 import { extractHashtags } from '@/misc/extract-hashtags.js';
 import * as Acct from '@/misc/acct.js';
@@ -295,8 +295,20 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			if (ps.chatScope !== undefined) updates.chatScope = ps.chatScope;

 			function checkMuteWordCount(mutedWords: (string[] | string)[], limit: number) {
-				// TODO: ちゃんと数える
-				const length = JSON.stringify(mutedWords).length;
+				const count = (arr: (string[] | string)[]) => {
+					let length = 0;
+					for (const item of arr) {
+						if (typeof item === 'string') {
+							length += item.length;
+						} else if (Array.isArray(item)) {
+							for (const subItem of item) {
+								length += subItem.length;
+							}
+						}
+					}
+					return length;
+				};
+				const length = count(mutedWords);
 				if (length > limit) {
 					throw new ApiError(meta.errors.tooManyMutedWords);
 				}
@@ -557,16 +569,15 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		try {
 			const html = await this.httpRequestService.getHtml(url);

-			const { window } = new JSDOM(html);
-			const doc: Document = window.document;
+			const doc = htmlParser.parse(html);

 			const myLink = `${this.config.url}/@${user.username}`;

 			const aEls = Array.from(doc.getElementsByTagName('a'));
 			const linkEls = Array.from(doc.getElementsByTagName('link'));

-			const includesMyLink = aEls.some(a => a.href === myLink);
-			const includesRelMeLinks = [...aEls, ...linkEls].some(link => link.rel === 'me' && link.href === myLink);
+			const includesMyLink = aEls.some(a => a.attributes.href === myLink);
+			const includesRelMeLinks = [...aEls, ...linkEls].some(link => link.attributes.rel?.split(/\s+/).includes('me') && link.attributes.href === myLink);

 			if (includesMyLink || includesRelMeLinks) {
 				await this.userProfilesRepository.createQueryBuilder('profile').update()
@@ -576,8 +587,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					})
 					.execute();
 			}
-
-			window.close();
 		} catch (err) {
 			// なにもしない
 		}
--- a/packages/backend/src/server/api/endpoints/notes/drafts/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/drafts/create.ts
@@ -135,6 +135,18 @@ export const meta = {
 			code: 'CANNOT_RENOTE_TO_EXTERNAL',
 			id: 'ed1952ac-2d26-4957-8b30-2deda76bedf7',
 		},
+
+		scheduledAtRequired: {
+			message: 'scheduledAt is required when isActuallyScheduled is true.',
+			code: 'SCHEDULED_AT_REQUIRED',
+			id: '15e28a55-e74c-4d65-89b7-8880cdaaa87d',
+		},
+
+		scheduledAtMustBeInFuture: {
+			message: 'scheduledAt must be in the future.',
+			code: 'SCHEDULED_AT_MUST_BE_IN_FUTURE',
+			id: 'e4bed6c9-017e-4934-aed0-01c22cc60ec1',
+		},
 	},

 	limit: {
@@ -252,6 +264,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 							throw new ApiError(meta.errors.cannotReplyToSpecifiedVisibilityNoteWithExtendedVisibility);
 						case 'c3275f19-4558-4c59-83e1-4f684b5fab66':
 							throw new ApiError(meta.errors.tooManyScheduledNotes);
+						case '94a89a43-3591-400a-9c17-dd166e71fdfa':
+							throw new ApiError(meta.errors.scheduledAtRequired);
+						case 'b34d0c1b-996f-4e34-a428-c636d98df457':
+							throw new ApiError(meta.errors.scheduledAtMustBeInFuture);
 						default:
 							throw err;
 					}
--- a/packages/backend/src/server/api/endpoints/notes/drafts/update.ts
+++ b/packages/backend/src/server/api/endpoints/notes/drafts/update.ts
@@ -165,6 +165,18 @@ export const meta = {
 			code: 'TOO_MANY_SCHEDULED_NOTES',
 			id: '02f5df79-08ae-4a33-8524-f1503c8f6212',
 		},
+
+		scheduledAtRequired: {
+			message: 'scheduledAt is required when isActuallyScheduled is true.',
+			code: 'SCHEDULED_AT_REQUIRED',
+			id: 'fe9737d5-cc41-498c-af9d-149207307530',
+		},
+
+		scheduledAtMustBeInFuture: {
+			message: 'scheduledAt must be in the future.',
+			code: 'SCHEDULED_AT_MUST_BE_IN_FUTURE',
+			id: 'ed1a6673-d0d1-4364-aaae-9bf3f139cbc5',
+		},
 	},

 	limit: {
@@ -295,6 +307,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 							throw new ApiError(meta.errors.containsTooManyMentions);
 						case 'bacdf856-5c51-4159-b88a-804fa5103be5':
 							throw new ApiError(meta.errors.tooManyScheduledNotes);
+						case '94a89a43-3591-400a-9c17-dd166e71fdfa':
+							throw new ApiError(meta.errors.scheduledAtRequired);
+						case 'b34d0c1b-996f-4e34-a428-c636d98df457':
+							throw new ApiError(meta.errors.scheduledAtMustBeInFuture);
 						default:
 							throw err;
 					}
--- a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -18,6 +18,8 @@ import { QueryService } from '@/core/QueryService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+import { ChannelFollowingService } from '@/core/ChannelFollowingService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@@ -46,7 +48,7 @@ export const meta = {
 		bothWithRepliesAndWithFiles: {
 			message: 'Specifying both withReplies and withFiles is not supported',
 			code: 'BOTH_WITH_REPLIES_AND_WITH_FILES',
-			id: 'dfaa3eb7-8002-4cb7-bcc4-1095df46656f'
+			id: 'dfaa3eb7-8002-4cb7-bcc4-1095df46656f',
 		},
 	},
 } as const;
@@ -79,9 +81,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

-		@Inject(DI.channelFollowingsRepository)
-		private channelFollowingsRepository: ChannelFollowingsRepository,
-
 		private noteEntityService: NoteEntityService,
 		private roleService: RoleService,
 		private activeUsersChart: ActiveUsersChart,
@@ -89,6 +88,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private cacheService: CacheService,
 		private queryService: QueryService,
 		private userFollowingService: UserFollowingService,
+		private channelMutingService: ChannelMutingService,
+		private channelFollowingService: ChannelFollowingService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
@@ -196,11 +197,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		withReplies: boolean,
 	}, me: MiLocalUser) {
 		const followees = await this.userFollowingService.getFollowees(me.id);
-		const followingChannels = await this.channelFollowingsRepository.find({
-			where: {
-				followerId: me.id,
-			},
-		});
+
+		const mutingChannelIds = await this.channelMutingService
+			.list({ requestUserId: me.id }, { idOnly: true })
+			.then(x => x.map(x => x.id));
+		const followingChannelIds = await this.channelFollowingService
+			.list({ requestUserId: me.id }, { idOnly: true })
+			.then(x => x.map(x => x.id).filter(x => !mutingChannelIds.includes(x)));

 		const query = this.queryService.makePaginationQuery(this.notesRepository.createQueryBuilder('note'), ps.sinceId, ps.untilId)
 			.andWhere(new Brackets(qb => {
@@ -219,9 +222,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			.leftJoinAndSelect('reply.user', 'replyUser')
 			.leftJoinAndSelect('renote.user', 'renoteUser');

-		if (followingChannels.length > 0) {
-			const followingChannelIds = followingChannels.map(x => x.followeeId);
-
+		if (followingChannelIds.length > 0) {
 			query.andWhere(new Brackets(qb => {
 				qb.where('note.channelId IN (:...followingChannelIds)', { followingChannelIds });
 				qb.orWhere('note.channelId IS NULL');
@@ -230,6 +231,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			query.andWhere('note.channelId IS NULL');
 		}

+		if (mutingChannelIds.length > 0) {
+			query.andWhere(new Brackets(qb => {
+				qb.orWhere('note.renoteChannelId IS NULL');
+				qb.orWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+			}));
+		}
+
 		if (!ps.withReplies) {
 			query.andWhere(new Brackets(qb => {
 				qb
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@@ -15,6 +15,7 @@ import { IdService } from '@/core/IdService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@@ -76,6 +77,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private queryService: QueryService,
+		private channelMutingService: ChannelMutingService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -157,7 +159,19 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 		this.queryService.generateVisibilityQuery(query, me);
 		this.queryService.generateBaseNoteFilteringQuery(query, me);
-		if (me) this.queryService.generateMutedUserRenotesQueryForNotes(query, me);
+		if (me) {
+			this.queryService.generateMutedUserRenotesQueryForNotes(query, me);
+
+			const mutedChannelIds = await this.channelMutingService
+				.list({ requestUserId: me.id }, { idOnly: true })
+				.then(x => x.map(x => x.id));
+			if (mutedChannelIds.length > 0) {
+				query.andWhere(new Brackets(qb => {
+					qb.orWhere('note.renoteChannelId IS NULL')
+						.orWhere('note.renoteChannelId NOT IN (:...mutedChannelIds)', { mutedChannelIds });
+				}));
+			}
+		}

 		if (ps.withFiles) {
 			query.andWhere('note.fileIds != \'{}\'');
--- 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, MiMeta } from '@/models/_.js';
+import type { NotesRepository, 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';
@@ -16,6 +16,8 @@ import { CacheService } from '@/core/CacheService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+import { ChannelFollowingService } from '@/core/ChannelFollowingService.js';

 export const meta = {
 	tags: ['notes'],
@@ -61,15 +63,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,

-		@Inject(DI.channelFollowingsRepository)
-		private channelFollowingsRepository: ChannelFollowingsRepository,
-
 		private noteEntityService: NoteEntityService,
 		private activeUsersChart: ActiveUsersChart,
 		private idService: IdService,
 		private cacheService: CacheService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private userFollowingService: UserFollowingService,
+		private channelMutingService: ChannelMutingService,
+		private channelFollowingService: ChannelFollowingService,
 		private queryService: QueryService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
@@ -140,11 +141,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 	private async getFromDb(ps: { untilId: string | null; sinceId: string | null; limit: number; includeMyRenotes: boolean; includeRenotedMyNotes: boolean; includeLocalRenotes: boolean; withFiles: boolean; withRenotes: boolean; }, me: MiLocalUser) {
 		const followees = await this.userFollowingService.getFollowees(me.id);
-		const followingChannels = await this.channelFollowingsRepository.find({
-			where: {
-				followerId: me.id,
-			},
-		});
+
+		const mutingChannelIds = await this.channelMutingService
+			.list({ requestUserId: me.id }, { idOnly: true })
+			.then(x => x.map(x => x.id));
+		const followingChannelIds = await this.channelFollowingService
+			.list({ requestUserId: me.id }, { idOnly: true })
+			.then(x => x.map(x => x.id).filter(x => !mutingChannelIds.includes(x)));

 		//#region Construct query
 		const query = this.queryService.makePaginationQuery(this.notesRepository.createQueryBuilder('note'), ps.sinceId, ps.untilId)
@@ -154,15 +157,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			.leftJoinAndSelect('reply.user', 'replyUser')
 			.leftJoinAndSelect('renote.user', 'renoteUser');

-		if (followees.length > 0 && followingChannels.length > 0) {
+		if (followees.length > 0 && followingChannelIds.length > 0) {
 			// ユーザー・チャンネルともにフォローあり
 			const meOrFolloweeIds = [me.id, ...followees.map(f => f.followeeId)];
-			const followingChannelIds = followingChannels.map(x => x.followeeId);
 			query.andWhere(new Brackets(qb => {
 				qb
 					.where(new Brackets(qb2 => {
 						qb2
-							.where('note.userId IN (:...meOrFolloweeIds)', { meOrFolloweeIds: meOrFolloweeIds })
+							.andWhere('note.userId IN (:...meOrFolloweeIds)', { meOrFolloweeIds: meOrFolloweeIds })
 							.andWhere('note.channelId IS NULL');
 					}))
 					.orWhere('note.channelId IN (:...followingChannelIds)', { followingChannelIds });
@@ -170,22 +172,32 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		} else if (followees.length > 0) {
 			// ユーザーフォローのみ（チャンネルフォローなし）
 			const meOrFolloweeIds = [me.id, ...followees.map(f => f.followeeId)];
-			query
-				.andWhere('note.channelId IS NULL')
-				.andWhere('note.userId IN (:...meOrFolloweeIds)', { meOrFolloweeIds: meOrFolloweeIds });
-		} else if (followingChannels.length > 0) {
-			// チャンネルフォローのみ（ユーザーフォローなし）
-			const followingChannelIds = followingChannels.map(x => x.followeeId);
 			query.andWhere(new Brackets(qb => {
 				qb
+					.andWhere('note.channelId IS NULL')
+					.andWhere('note.userId IN (:...meOrFolloweeIds)', { meOrFolloweeIds: meOrFolloweeIds });
+				if (mutingChannelIds.length > 0) {
+					qb.andWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+				}
+			}));
+		} else if (followingChannelIds.length > 0) {
+			// チャンネルフォローのみ（ユーザーフォローなし）
+			query.andWhere(new Brackets(qb => {
+				qb
+					// renoteChannelIdは見る必要が無い
+					// ・HTLに流れてくるチャンネル＝フォローしているチャンネル
+					// ・HTLにフォロー外のチャンネルが流れるのは、フォローしているユーザがそのチャンネル投稿をリノートした場合のみ
+					// つまり、ユーザフォローしてない前提のこのブロックでは見る必要が無い
 					.where('note.channelId IN (:...followingChannelIds)', { followingChannelIds })
 					.orWhere('note.userId = :meId', { meId: me.id });
 			}));
 		} else {
 			// フォローなし
-			query
-				.andWhere('note.channelId IS NULL')
-				.andWhere('note.userId = :meId', { meId: me.id });
+			query.andWhere(new Brackets(qb => {
+				qb
+					.andWhere('note.channelId IS NULL')
+					.andWhere('note.userId = :meId', { meId: me.id });
+			}));
 		}

 		query.andWhere(new Brackets(qb => {
--- a/packages/backend/src/server/api/endpoints/notes/translate.ts
+++ b/packages/backend/src/server/api/endpoints/notes/translate.ts
@@ -95,7 +95,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			if (targetLang.includes('-')) targetLang = targetLang.split('-')[0];

 			const params = new URLSearchParams();
-			params.append('auth_key', this.serverSettings.deeplAuthKey);
 			params.append('text', note.text);
 			params.append('target_lang', targetLang);

@@ -104,6 +103,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			const res = await this.httpRequestService.send(endpoint, {
 				method: 'POST',
 				headers: {
+					'Authorization': `DeepL-Auth-Key ${this.serverSettings.deeplAuthKey}`,
 					'Content-Type': 'application/x-www-form-urlencoded',
 					Accept: 'application/json, */*',
 				},
--- a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
@@ -14,6 +14,7 @@ import { IdService } from '@/core/IdService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@@ -84,6 +85,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private queryService: QueryService,
+		private channelMutingService: ChannelMutingService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -187,6 +189,17 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		this.queryService.generateBaseNoteFilteringQuery(query, me);
 		this.queryService.generateMutedUserRenotesQueryForNotes(query, me);

+		// -- ミュートされたチャンネルのリノート対策
+		const mutedChannelIds = await this.channelMutingService
+			.list({ requestUserId: me.id }, { idOnly: true })
+			.then(x => x.map(x => x.id));
+		if (mutedChannelIds.length > 0) {
+			query.andWhere(new Brackets(qb => {
+				qb.orWhere('note.renoteChannelId IS NULL')
+					.orWhere('note.renoteChannelId NOT IN (:...mutedChannelIds)', { mutedChannelIds });
+			}));
+		}
+
 		if (ps.includeMyRenotes === false) {
 			query.andWhere(new Brackets(qb => {
 				qb.orWhere('note.userId != :meId', { meId: me.id });
--- a/packages/backend/src/server/api/endpoints/roles/notes.ts
+++ b/packages/backend/src/server/api/endpoints/roles/notes.ts
@@ -5,6 +5,7 @@

 import { Inject, Injectable } from '@nestjs/common';
 import * as Redis from 'ioredis';
+import { Brackets } from 'typeorm';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { NotesRepository, RolesRepository } from '@/models/_.js';
 import { QueryService } from '@/core/QueryService.js';
@@ -12,6 +13,7 @@ import { DI } from '@/di-symbols.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { IdService } from '@/core/IdService.js';
 import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { ApiError } from '../../error.js';

 export const meta = {
@@ -68,6 +70,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private noteEntityService: NoteEntityService,
 		private queryService: QueryService,
 		private fanoutTimelineService: FanoutTimelineService,
+		private channelMutingService: ChannelMutingService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -101,6 +104,21 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				.leftJoinAndSelect('reply.user', 'replyUser')
 				.leftJoinAndSelect('renote.user', 'renoteUser');

+			// -- ミュートされたチャンネル対策
+			const mutingChannelIds = await this.channelMutingService
+				.list({ requestUserId: me.id }, { idOnly: true })
+				.then(x => x.map(x => x.id));
+			if (mutingChannelIds.length > 0) {
+				query.andWhere(new Brackets(qb => {
+					qb.orWhere('note.channelId IS NULL');
+					qb.orWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+				}));
+				query.andWhere(new Brackets(qb => {
+					qb.orWhere('note.renoteChannelId IS NULL');
+					qb.orWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+				}));
+			}
+
 			this.queryService.generateVisibilityQuery(query, me);
 			this.queryService.generateBaseNoteFilteringQuery(query, me);

--- a/packages/backend/src/server/api/endpoints/users/notes.ts
+++ b/packages/backend/src/server/api/endpoints/users/notes.ts
@@ -16,6 +16,7 @@ import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { FanoutTimelineName } from '@/core/FanoutTimelineService.js';
 import { ApiError } from '@/server/api/error.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';

 export const meta = {
 	tags: ['users', 'notes'],
@@ -77,12 +78,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-

 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
-
 		private noteEntityService: NoteEntityService,
 		private queryService: QueryService,
 		private cacheService: CacheService,
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
+		private channelMutingService: ChannelMutingService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -165,6 +166,11 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		withFiles: boolean,
 		withRenotes: boolean,
 	}, me: MiLocalUser | null) {
+		const mutingChannelIds = me
+			? await this.channelMutingService
+				.list({ requestUserId: me.id }, { idOnly: true })
+				.then(x => x.map(x => x.id))
+			: [];
 		const isSelf = me && (me.id === ps.userId);

 		const query = this.queryService.makePaginationQuery(this.notesRepository.createQueryBuilder('note'), ps.sinceId, ps.untilId)
@@ -177,14 +183,30 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			.leftJoinAndSelect('renote.user', 'renoteUser');

 		if (ps.withChannelNotes) {
-			if (!isSelf) query.andWhere(new Brackets(qb => {
-				qb.orWhere('note.channelId IS NULL');
-				qb.orWhere('channel.isSensitive = false');
+			query.andWhere(new Brackets(qb => {
+				if (mutingChannelIds.length > 0) {
+					qb.andWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds: mutingChannelIds });
+				}
+
+				if (!isSelf) {
+					qb.andWhere(new Brackets(qb2 => {
+						qb2.orWhere('note.channelId IS NULL');
+						qb2.orWhere('channel.isSensitive = false');
+					}));
+				}
 			}));
 		} else {
 			query.andWhere('note.channelId IS NULL');
 		}

+		// -- ミュートされたチャンネルのリノート対策
+		if (mutingChannelIds.length > 0) {
+			query.andWhere(new Brackets(qb => {
+				qb.orWhere('note.renoteChannelId IS NULL');
+				qb.orWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+			}));
+		}
+
 		this.queryService.generateVisibilityQuery(query, me);
 		this.queryService.generateBaseNoteFilteringQuery(query, me, {
 			excludeAuthor: true,
--- a/packages/backend/src/server/api/stream/Connection.ts
+++ b/packages/backend/src/server/api/stream/Connection.ts
@@ -11,8 +11,9 @@ import type { NotificationService } from '@/core/NotificationService.js';
 import { bindThis } from '@/decorators.js';
 import { CacheService } from '@/core/CacheService.js';
 import { MiFollowing, MiUserProfile } from '@/models/_.js';
-import type { StreamEventEmitter, GlobalEvents } from '@/core/GlobalEventService.js';
+import type { GlobalEvents, StreamEventEmitter } from '@/core/GlobalEventService.js';
 import { ChannelFollowingService } from '@/core/ChannelFollowingService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { isJsonObject } from '@/misc/json-value.js';
 import type { JsonObject, JsonValue } from '@/misc/json-value.js';
 import type { ChannelsService } from './ChannelsService.js';
@@ -35,6 +36,7 @@ export default class Connection {
 	public userProfile: MiUserProfile | null = null;
 	public following: Record<string, Pick<MiFollowing, 'withReplies'> | undefined> = {};
 	public followingChannels: Set<string> = new Set();
+	public mutingChannels: Set<string> = new Set();
 	public userIdsWhoMeMuting: Set<string> = new Set();
 	public userIdsWhoBlockingMe: Set<string> = new Set();
 	public userIdsWhoMeMutingRenotes: Set<string> = new Set();
@@ -46,7 +48,7 @@ export default class Connection {
 		private notificationService: NotificationService,
 		private cacheService: CacheService,
 		private channelFollowingService: ChannelFollowingService,
-
+		private channelMutingService: ChannelMutingService,
 		user: MiUser | null | undefined,
 		token: MiAccessToken | null | undefined,
 	) {
@@ -57,10 +59,19 @@ export default class Connection {
 	@bindThis
 	public async fetch() {
 		if (this.user == null) return;
-		const [userProfile, following, followingChannels, userIdsWhoMeMuting, userIdsWhoBlockingMe, userIdsWhoMeMutingRenotes] = await Promise.all([
+		const [
+			userProfile,
+			following,
+			followingChannels,
+			mutingChannels,
+			userIdsWhoMeMuting,
+			userIdsWhoBlockingMe,
+			userIdsWhoMeMutingRenotes,
+		] = await Promise.all([
 			this.cacheService.userProfileCache.fetch(this.user.id),
 			this.cacheService.userFollowingsCache.fetch(this.user.id),
 			this.channelFollowingService.userFollowingChannelsCache.fetch(this.user.id),
+			this.channelMutingService.mutingChannelsCache.fetch(this.user.id),
 			this.cacheService.userMutingsCache.fetch(this.user.id),
 			this.cacheService.userBlockedCache.fetch(this.user.id),
 			this.cacheService.renoteMutingsCache.fetch(this.user.id),
@@ -68,6 +79,7 @@ export default class Connection {
 		this.userProfile = userProfile;
 		this.following = following;
 		this.followingChannels = followingChannels;
+		this.mutingChannels = mutingChannels;
 		this.userIdsWhoMeMuting = userIdsWhoMeMuting;
 		this.userIdsWhoBlockingMe = userIdsWhoBlockingMe;
 		this.userIdsWhoMeMutingRenotes = userIdsWhoMeMutingRenotes;
--- a/packages/backend/src/server/api/stream/channel.ts
+++ b/packages/backend/src/server/api/stream/channel.ts
@@ -6,7 +6,8 @@
 import { bindThis } from '@/decorators.js';
 import { isInstanceMuted } from '@/misc/is-instance-muted.js';
 import { isUserRelated } from '@/misc/is-user-related.js';
-import { isRenotePacked, isQuotePacked } from '@/misc/is-renote.js';
+import { isQuotePacked, isRenotePacked } from '@/misc/is-renote.js';
+import { isChannelRelated } from '@/misc/is-channel-related.js';
 import type { Packed } from '@/misc/json-schema.js';
 import type { JsonObject, JsonValue } from '@/misc/json-value.js';
 import type Connection from './Connection.js';
@@ -55,6 +56,10 @@ export default abstract class Channel {
 		return this.connection.followingChannels;
 	}

+	protected get mutingChannels() {
+		return this.connection.mutingChannels;
+	}
+
 	protected get subscriber() {
 		return this.connection.subscriber;
 	}
@@ -74,6 +79,9 @@ export default abstract class Channel {
 		// 流れてきたNoteがリノートをミュートしてるユーザが行ったもの
 		if (isRenotePacked(note) && !isQuotePacked(note) && this.userIdsWhoMeMutingRenotes.has(note.user.id)) return true;

+		// 流れてきたNoteがミュートしているチャンネルと関わる
+		if (isChannelRelated(note, this.mutingChannels)) return true;
+
 		return false;
 	}

--- a/packages/backend/src/server/api/stream/channels/channel.ts
+++ b/packages/backend/src/server/api/stream/channels/channel.ts
@@ -8,6 +8,8 @@ import type { Packed } from '@/misc/json-schema.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { bindThis } from '@/decorators.js';
 import { isRenotePacked, isQuotePacked } from '@/misc/is-renote.js';
+import { isInstanceMuted } from '@/misc/is-instance-muted.js';
+import { isUserRelated } from '@/misc/is-user-related.js';
 import type { JsonObject } from '@/misc/json-value.js';
 import Channel, { type MiChannelService } from '../channel.js';

@@ -19,7 +21,6 @@ class ChannelChannel extends Channel {

 	constructor(
 		private noteEntityService: NoteEntityService,
-
 		id: string,
 		connection: Channel['connection'],
 	) {
@@ -40,6 +41,10 @@ class ChannelChannel extends Channel {
 	private async onNote(note: Packed<'Note'>) {
 		if (note.channelId !== this.channelId) return;

+		if (note.user.requireSigninToViewContents && this.user == null) return;
+		if (note.renote && note.renote.user.requireSigninToViewContents && this.user == null) return;
+		if (note.reply && note.reply.user.requireSigninToViewContents && this.user == null) return;
+
 		if (this.isNoteMutedOrBlocked(note)) return;

 		if (this.user && isRenotePacked(note) && !isQuotePacked(note)) {
@@ -52,6 +57,35 @@ class ChannelChannel extends Channel {
 		this.send('note', note);
 	}

+	/*
+	 * ミュートとブロックされてるを処理する
+	 */
+	protected override isNoteMutedOrBlocked(note: Packed<'Note'>): boolean {
+		// 流れてきたNoteがインスタンスミュートしたインスタンスが関わる
+		if (isInstanceMuted(note, new Set<string>(this.userProfile?.mutedInstances ?? []))) return true;
+
+		// 流れてきたNoteがミュートしているユーザーが関わる
+		if (isUserRelated(note, this.userIdsWhoMeMuting)) return true;
+		// 流れてきたNoteがブロックされているユーザーが関わる
+		if (isUserRelated(note, this.userIdsWhoBlockingMe)) return true;
+
+		// 流れてきたNoteがリノートをミュートしてるユーザが行ったもの
+		if (isRenotePacked(note) && !isQuotePacked(note) && this.userIdsWhoMeMutingRenotes.has(note.user.id)) return true;
+
+		// このソケットで見ているチャンネルがミュートされていたとしても、チャンネルを直接見ている以上は流すようにしたい
+		// ただし、他のミュートしているチャンネルは流さないようにもしたい
+		// ノート自体のチャンネルIDはonNoteでチェックしているので、ここではリノートのチャンネルIDをチェックする
+		if (
+			(note.renote) &&
+			(note.renote.channelId !== this.channelId) &&
+			(note.renote.channelId && this.mutingChannels.has(note.renote.channelId))
+		) {
+			return true;
+		}
+
+		return false;
+	}
+
 	@bindThis
 	public dispose() {
 		// Unsubscribe events
--- a/packages/backend/src/server/api/stream/channels/home-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/home-timeline.ts
@@ -44,7 +44,10 @@ class HomeTimelineChannel extends Channel {
 		if (this.withFiles && (note.fileIds == null || note.fileIds.length === 0)) return;

 		if (note.channelId) {
-			if (!this.followingChannels.has(note.channelId)) return;
+			// そのチャンネルをフォローしていない
+			if (!this.followingChannels.has(note.channelId)) {
+				return;
+			}
 		} else {
 			// その投稿のユーザーをフォローしていなかったら弾く
 			if (!isMe && !Object.hasOwn(this.following, note.userId)) return;
--- a/packages/backend/src/server/api/stream/channels/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/hybrid-timeline.ts
@@ -53,16 +53,25 @@ class HybridTimelineChannel extends Channel {

 		if (this.withFiles && (note.fileIds == null || note.fileIds.length === 0)) return;

-		// チャンネルの投稿ではなく、自分自身の投稿 または
-		// チャンネルの投稿ではなく、その投稿のユーザーをフォローしている または
-		// チャンネルの投稿ではなく、全体公開のローカルの投稿 または
-		// フォローしているチャンネルの投稿 の場合だけ
-		if (!(
-			(note.channelId == null && isMe) ||
-			(note.channelId == null && Object.hasOwn(this.following, note.userId)) ||
-			(note.channelId == null && (note.user.host == null && note.visibility === 'public')) ||
-			(note.channelId != null && this.followingChannels.has(note.channelId))
-		)) return;
+		if (!note.channelId) {
+			// 以下の条件に該当するノートのみ後続処理に通す（ので、以下のif文は該当しないノートをすべて弾くようにする）
+			// - 自分自身の投稿
+			// - その投稿のユーザーをフォローしている
+			// - 全体公開のローカルの投稿
+			if (!(
+				isMe ||
+				Object.hasOwn(this.following, note.userId) ||
+				(note.user.host == null && note.visibility === 'public')
+			)) {
+				return;
+			}
+		} else {
+			// 以下の条件に該当するノートのみ後続処理に通す（ので、以下のif文は該当しないノートをすべて弾くようにする）
+			// - フォローしているチャンネルの投稿
+			if (!this.followingChannels.has(note.channelId)) {
+				return;
+			}
+		}

 		if (note.visibility === 'followers') {
 			if (!isMe && !Object.hasOwn(this.following, note.userId)) return;
--- a/Show More
+++ b/Show More