Merge pull request #14580 from misskey-dev/develop

Release: 2024.9.0

128 files changed, 2847 insertions, 663 deletions

diff --git a/packages/backend/src/GlobalModule.ts b/packages/backend/src/GlobalModule.ts
index 09971e8ca0..6ae8ccfbb3 100644
--- a/packages/backend/src/GlobalModule.ts
+++ b/packages/backend/src/GlobalModule.ts
@@ -13,6 +13,8 @@ import { createPostgresDataSource } from './postgres.js';
 import { RepositoryModule } from './models/RepositoryModule.js';
 import { allSettled } from './misc/promise-tracker.js';
 import type { Provider, OnApplicationShutdown } from '@nestjs/common';
+import { MiMeta } from '@/models/Meta.js';
+import { GlobalEvents } from './core/GlobalEventService.js';
 
 const $config: Provider = {
 	provide: DI.config,
@@ -78,11 +80,76 @@ const $redisForTimelines: Provider = {
 	inject: [DI.config],
 };
 
+const $redisForReactions: Provider = {
+	provide: DI.redisForReactions,
+	useFactory: (config: Config) => {
+		return new Redis.Redis(config.redisForReactions);
+	},
+	inject: [DI.config],
+};
+
+const $meta: Provider = {
+	provide: DI.meta,
+	useFactory: async (db: DataSource, redisForSub: Redis.Redis) => {
+		const meta = await db.transaction(async transactionalEntityManager => {
+			// 過去のバグでレコードが複数出来てしまっている可能性があるので新しいIDを優先する
+			const metas = await transactionalEntityManager.find(MiMeta, {
+				order: {
+					id: 'DESC',
+				},
+			});
+
+			const meta = metas[0];
+
+			if (meta) {
+				return meta;
+			} else {
+				// metaが空のときfetchMetaが同時に呼ばれるとここが同時に呼ばれてしまうことがあるのでフェイルセーフなupsertを使う
+				const saved = await transactionalEntityManager
+					.upsert(
+						MiMeta,
+						{
+							id: 'x',
+						},
+						['id'],
+					)
+					.then((x) => transactionalEntityManager.findOneByOrFail(MiMeta, x.identifiers[0]));
+
+				return saved;
+			}
+		});
+
+		async function onMessage(_: string, data: string): Promise<void> {
+			const obj = JSON.parse(data);
+
+			if (obj.channel === 'internal') {
+				const { type, body } = obj.message as GlobalEvents['internal']['payload'];
+				switch (type) {
+					case 'metaUpdated': {
+						for (const key in body.after) {
+							(meta as any)[key] = (body.after as any)[key];
+						}
+						meta.proxyAccount = null; // joinなカラムは通常取ってこないので
+						break;
+					}
+					default:
+						break;
+				}
+			}
+		}
+
+		redisForSub.on('message', onMessage);
+
+		return meta;
+	},
+	inject: [DI.db, DI.redisForSub],
+};
+
 @Global()
 @Module({
 	imports: [RepositoryModule],
-	providers: [$config, $db, $meilisearch, $redis, $redisForPub, $redisForSub, $redisForTimelines],
-	exports: [$config, $db, $meilisearch, $redis, $redisForPub, $redisForSub, $redisForTimelines, RepositoryModule],
+	providers: [$config, $db, $meta, $meilisearch, $redis, $redisForPub, $redisForSub, $redisForTimelines, $redisForReactions],
+	exports: [$config, $db, $meta, $meilisearch, $redis, $redisForPub, $redisForSub, $redisForTimelines, $redisForReactions, RepositoryModule],
 })
 export class GlobalModule implements OnApplicationShutdown {
 	constructor(
@@ -91,6 +158,7 @@ export class GlobalModule implements OnApplicationShutdown {
 		@Inject(DI.redisForPub) private redisForPub: Redis.Redis,
 		@Inject(DI.redisForSub) private redisForSub: Redis.Redis,
 		@Inject(DI.redisForTimelines) private redisForTimelines: Redis.Redis,
+		@Inject(DI.redisForReactions) private redisForReactions: Redis.Redis,
 	) { }
 
 	public async dispose(): Promise<void> {
@@ -103,6 +171,7 @@ export class GlobalModule implements OnApplicationShutdown {
 			this.redisForPub.disconnect(),
 			this.redisForSub.disconnect(),
 			this.redisForTimelines.disconnect(),
+			this.redisForReactions.disconnect(),
 		]);
 	}
 
diff --git a/packages/backend/src/config.ts b/packages/backend/src/config.ts
index 3e5a1e81cd..97ba79c574 100644
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -49,6 +49,7 @@ type Source = {
 	redisForPubsub?: RedisOptionsSource;
 	redisForJobQueue?: RedisOptionsSource;
 	redisForTimelines?: RedisOptionsSource;
+	redisForReactions?: RedisOptionsSource;
 	meilisearch?: {
 		host: string;
 		port: string;
@@ -133,7 +134,7 @@ export type Config = {
 	proxySmtp: string | undefined;
 	proxyBypassHosts: string[] | undefined;
 	allowedPrivateNetworks: string[] | undefined;
-	maxFileSize: number | undefined;
+	maxFileSize: number;
 	clusterLimit: number | undefined;
 	id: string;
 	outgoingAddress: string | undefined;
@@ -160,8 +161,10 @@ export type Config = {
 	authUrl: string;
 	driveUrl: string;
 	userAgent: string;
-	clientEntry: string;
-	clientManifestExists: boolean;
+	frontendEntry: string;
+	frontendManifestExists: boolean;
+	frontendEmbedEntry: string;
+	frontendEmbedManifestExists: boolean;
 	mediaProxy: string;
 	externalMediaProxyEnabled: boolean;
 	videoThumbnailGenerator: string | null;
@@ -169,6 +172,7 @@ export type Config = {
 	redisForPubsub: RedisOptions & RedisOptionsSource;
 	redisForJobQueue: RedisOptions & RedisOptionsSource;
 	redisForTimelines: RedisOptions & RedisOptionsSource;
+	redisForReactions: RedisOptions & RedisOptionsSource;
 	sentryForBackend: { options: Partial<Sentry.NodeOptions>; enableNodeProfiling: boolean; } | undefined;
 	sentryForFrontend: { options: Partial<Sentry.NodeOptions> } | undefined;
 	perChannelMaxNoteCacheCount: number;
@@ -196,10 +200,16 @@ const path = process.env.MISSKEY_CONFIG_YML
 
 export function loadConfig(): Config {
 	const meta = JSON.parse(fs.readFileSync(`${_dirname}/../../../built/meta.json`, 'utf-8'));
-	const clientManifestExists = fs.existsSync(_dirname + '/../../../built/_vite_/manifest.json');
-	const clientManifest = clientManifestExists ?
-		JSON.parse(fs.readFileSync(`${_dirname}/../../../built/_vite_/manifest.json`, 'utf-8'))
+
+	const frontendManifestExists = fs.existsSync(_dirname + '/../../../built/_frontend_vite_/manifest.json');
+	const frontendEmbedManifestExists = fs.existsSync(_dirname + '/../../../built/_frontend_embed_vite_/manifest.json');
+	const frontendManifest = frontendManifestExists ?
+		JSON.parse(fs.readFileSync(`${_dirname}/../../../built/_frontend_vite_/manifest.json`, 'utf-8'))
 		: { 'src/_boot_.ts': { file: 'src/_boot_.ts' } };
+	const frontendEmbedManifest = frontendEmbedManifestExists ?
+		JSON.parse(fs.readFileSync(`${_dirname}/../../../built/_frontend_embed_vite_/manifest.json`, 'utf-8'))
+		: { 'src/boot.ts': { file: 'src/boot.ts' } };
+
 	const config = yaml.load(fs.readFileSync(path, 'utf-8')) as Source;
 
 	const url = tryCreateUrl(config.url ?? process.env.MISSKEY_URL ?? '');
@@ -243,6 +253,7 @@ export function loadConfig(): Config {
 		redisForPubsub: config.redisForPubsub ? convertRedisOptions(config.redisForPubsub, host) : redis,
 		redisForJobQueue: config.redisForJobQueue ? convertRedisOptions(config.redisForJobQueue, host) : redis,
 		redisForTimelines: config.redisForTimelines ? convertRedisOptions(config.redisForTimelines, host) : redis,
+		redisForReactions: config.redisForReactions ? convertRedisOptions(config.redisForReactions, host) : redis,
 		sentryForBackend: config.sentryForBackend,
 		sentryForFrontend: config.sentryForFrontend,
 		id: config.id,
@@ -250,7 +261,7 @@ export function loadConfig(): Config {
 		proxySmtp: config.proxySmtp,
 		proxyBypassHosts: config.proxyBypassHosts,
 		allowedPrivateNetworks: config.allowedPrivateNetworks,
-		maxFileSize: config.maxFileSize,
+		maxFileSize: config.maxFileSize ?? 262144000,
 		clusterLimit: config.clusterLimit,
 		outgoingAddress: config.outgoingAddress,
 		outgoingAddressFamily: config.outgoingAddressFamily,
@@ -270,8 +281,10 @@ export function loadConfig(): Config {
 			config.videoThumbnailGenerator.endsWith('/') ? config.videoThumbnailGenerator.substring(0, config.videoThumbnailGenerator.length - 1) : config.videoThumbnailGenerator
 			: null,
 		userAgent: `Misskey/${version} (${config.url})`,
-		clientEntry: clientManifest['src/_boot_.ts'],
-		clientManifestExists: clientManifestExists,
+		frontendEntry: frontendManifest['src/_boot_.ts'],
+		frontendManifestExists: frontendManifestExists,
+		frontendEmbedEntry: frontendEmbedManifest['src/boot.ts'],
+		frontendEmbedManifestExists: frontendEmbedManifestExists,
 		perChannelMaxNoteCacheCount: config.perChannelMaxNoteCacheCount ?? 1000,
 		perUserNotificationsMaxCount: config.perUserNotificationsMaxCount ?? 500,
 		deactivateAntennaThreshold: config.deactivateAntennaThreshold ?? (1000 * 60 * 60 * 24 * 7),
diff --git a/packages/backend/src/const.ts b/packages/backend/src/const.ts
index a238f4973a..e3a61861f4 100644
--- a/packages/backend/src/const.ts
+++ b/packages/backend/src/const.ts
@@ -8,6 +8,8 @@ export const MAX_NOTE_TEXT_LENGTH = 3000;
 export const USER_ONLINE_THRESHOLD = 1000 * 60 * 10; // 10min
 export const USER_ACTIVE_THRESHOLD = 1000 * 60 * 60 * 24 * 3; // 3days
 
+export const PER_NOTE_REACTION_USER_PAIR_CACHE_MAX = 16;
+
 //#region hard limits
 // If you change DB_* values, you must also change the DB schema.
 
diff --git a/packages/backend/src/core/AbuseReportNotificationService.ts b/packages/backend/src/core/AbuseReportNotificationService.ts
index 7be5335885..fe2c63e7d6 100644
--- a/packages/backend/src/core/AbuseReportNotificationService.ts
+++ b/packages/backend/src/core/AbuseReportNotificationService.ts
@@ -14,10 +14,10 @@ import type {
 	AbuseReportNotificationRecipientRepository,
 	MiAbuseReportNotificationRecipient,
 	MiAbuseUserReport,
+	MiMeta,
 	MiUser,
 } from '@/models/_.js';
 import { EmailService } from '@/core/EmailService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { RecipientMethod } from '@/models/AbuseReportNotificationRecipient.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
@@ -27,15 +27,19 @@ import { IdService } from './IdService.js';
 @Injectable()
 export class AbuseReportNotificationService implements OnApplicationShutdown {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.abuseReportNotificationRecipientRepository)
 		private abuseReportNotificationRecipientRepository: AbuseReportNotificationRecipientRepository,
+
 		@Inject(DI.redisForSub)
 		private redisForSub: Redis.Redis,
+
 		private idService: IdService,
 		private roleService: RoleService,
 		private systemWebhookService: SystemWebhookService,
 		private emailService: EmailService,
-		private metaService: MetaService,
 		private moderationLogService: ModerationLogService,
 		private globalEventService: GlobalEventService,
 	) {
@@ -93,10 +97,8 @@ export class AbuseReportNotificationService implements OnApplicationShutdown {
 			.filter(x => x != null),
 		);
 
-		// 送信先の鮮度を保つため、毎回取得する
-		const meta = await this.metaService.fetch(true);
 		recipientEMailAddresses.push(
-			...(meta.email ? [meta.email] : []),
+			...(this.meta.email ? [this.meta.email] : []),
 		);
 
 		if (recipientEMailAddresses.length <= 0) {
diff --git a/packages/backend/src/core/AccountMoveService.ts b/packages/backend/src/core/AccountMoveService.ts
index b6b591d240..6e3125044c 100644
--- a/packages/backend/src/core/AccountMoveService.ts
+++ b/packages/backend/src/core/AccountMoveService.ts
@@ -9,7 +9,7 @@ import { IsNull, In, MoreThan, Not } from 'typeorm';
 import { bindThis } from '@/decorators.js';
 import { DI } from '@/di-symbols.js';
 import type { MiLocalUser, MiRemoteUser, MiUser } from '@/models/User.js';
-import type { BlockingsRepository, FollowingsRepository, InstancesRepository, MutingsRepository, UserListMembershipsRepository, UsersRepository } from '@/models/_.js';
+import type { BlockingsRepository, FollowingsRepository, InstancesRepository, MiMeta, MutingsRepository, UserListMembershipsRepository, UsersRepository } from '@/models/_.js';
 import type { RelationshipJobData, ThinUser } from '@/queue/types.js';
 
 import { IdService } from '@/core/IdService.js';
@@ -22,13 +22,15 @@ import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ProxyAccountService } from '@/core/ProxyAccountService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
-import { MetaService } from '@/core/MetaService.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
 import PerUserFollowingChart from '@/core/chart/charts/per-user-following.js';
 
 @Injectable()
 export class AccountMoveService {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -57,7 +59,6 @@ export class AccountMoveService {
 		private perUserFollowingChart: PerUserFollowingChart,
 		private federatedInstanceService: FederatedInstanceService,
 		private instanceChart: InstanceChart,
-		private metaService: MetaService,
 		private relayService: RelayService,
 		private queueService: QueueService,
 	) {
@@ -276,7 +277,7 @@ export class AccountMoveService {
 		if (this.userEntityService.isRemoteUser(oldAccount)) {
 			this.federatedInstanceService.fetch(oldAccount.host).then(async i => {
 				this.instancesRepository.decrement({ id: i.id }, 'followersCount', localFollowerIds.length);
-				if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.updateFollowers(i.host, false);
 				}
 			});
diff --git a/packages/backend/src/core/AntennaService.ts b/packages/backend/src/core/AntennaService.ts
index 793d8974b3..e827ffa68c 100644
--- a/packages/backend/src/core/AntennaService.ts
+++ b/packages/backend/src/core/AntennaService.ts
@@ -123,11 +123,14 @@ export class AntennaService implements OnApplicationShutdown {
 		if (antenna.src === 'home') {
 			// TODO
 		} else if (antenna.src === 'list') {
-			const listUsers = (await this.userListMembershipsRepository.findBy({
-				userListId: antenna.userListId!,
-			})).map(x => x.userId);
-
-			if (!listUsers.includes(note.userId)) return false;
+			if (antenna.userListId == null) return false;
+			const exists = await this.userListMembershipsRepository.exists({
+				where: {
+					userListId: antenna.userListId,
+					userId: note.userId,
+				},
+			});
+			if (!exists) return false;
 		} else if (antenna.src === 'users') {
 			const accts = antenna.users.map(x => {
 				const { username, host } = Acct.parse(x);
diff --git a/packages/backend/src/core/CoreModule.ts b/packages/backend/src/core/CoreModule.ts
index c9427bbeb7..3b3c35f976 100644
--- a/packages/backend/src/core/CoreModule.ts
+++ b/packages/backend/src/core/CoreModule.ts
@@ -13,6 +13,7 @@ import {
 import { AbuseReportNotificationService } from '@/core/AbuseReportNotificationService.js';
 import { SystemWebhookService } from '@/core/SystemWebhookService.js';
 import { UserSearchService } from '@/core/UserSearchService.js';
+import { WebhookTestService } from '@/core/WebhookTestService.js';
 import { AccountMoveService } from './AccountMoveService.js';
 import { AccountUpdateService } from './AccountUpdateService.js';
 import { AiService } from './AiService.js';
@@ -49,6 +50,7 @@ import { PollService } from './PollService.js';
 import { PushNotificationService } from './PushNotificationService.js';
 import { QueryService } from './QueryService.js';
 import { ReactionService } from './ReactionService.js';
+import { ReactionsBufferingService } from './ReactionsBufferingService.js';
 import { RelayService } from './RelayService.js';
 import { RoleService } from './RoleService.js';
 import { S3Service } from './S3Service.js';
@@ -192,6 +194,7 @@ const $ProxyAccountService: Provider = { provide: 'ProxyAccountService', useExis
 const $PushNotificationService: Provider = { provide: 'PushNotificationService', useExisting: PushNotificationService };
 const $QueryService: Provider = { provide: 'QueryService', useExisting: QueryService };
 const $ReactionService: Provider = { provide: 'ReactionService', useExisting: ReactionService };
+const $ReactionsBufferingService: Provider = { provide: 'ReactionsBufferingService', useExisting: ReactionsBufferingService };
 const $RelayService: Provider = { provide: 'RelayService', useExisting: RelayService };
 const $RoleService: Provider = { provide: 'RoleService', useExisting: RoleService };
 const $S3Service: Provider = { provide: 'S3Service', useExisting: S3Service };
@@ -211,6 +214,7 @@ const $UserAuthService: Provider = { provide: 'UserAuthService', useExisting: Us
 const $VideoProcessingService: Provider = { provide: 'VideoProcessingService', useExisting: VideoProcessingService };
 const $UserWebhookService: Provider = { provide: 'UserWebhookService', useExisting: UserWebhookService };
 const $SystemWebhookService: Provider = { provide: 'SystemWebhookService', useExisting: SystemWebhookService };
+const $WebhookTestService: Provider = { provide: 'WebhookTestService', useExisting: WebhookTestService };
 const $UtilityService: Provider = { provide: 'UtilityService', useExisting: UtilityService };
 const $FileInfoService: Provider = { provide: 'FileInfoService', useExisting: FileInfoService };
 const $SearchService: Provider = { provide: 'SearchService', useExisting: SearchService };
@@ -340,6 +344,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		PushNotificationService,
 		QueryService,
 		ReactionService,
+		ReactionsBufferingService,
 		RelayService,
 		RoleService,
 		S3Service,
@@ -359,6 +364,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		VideoProcessingService,
 		UserWebhookService,
 		SystemWebhookService,
+		WebhookTestService,
 		UtilityService,
 		FileInfoService,
 		SearchService,
@@ -484,6 +490,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$PushNotificationService,
 		$QueryService,
 		$ReactionService,
+		$ReactionsBufferingService,
 		$RelayService,
 		$RoleService,
 		$S3Service,
@@ -503,6 +510,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$VideoProcessingService,
 		$UserWebhookService,
 		$SystemWebhookService,
+		$WebhookTestService,
 		$UtilityService,
 		$FileInfoService,
 		$SearchService,
@@ -629,6 +637,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		PushNotificationService,
 		QueryService,
 		ReactionService,
+		ReactionsBufferingService,
 		RelayService,
 		RoleService,
 		S3Service,
@@ -648,6 +657,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		VideoProcessingService,
 		UserWebhookService,
 		SystemWebhookService,
+		WebhookTestService,
 		UtilityService,
 		FileInfoService,
 		SearchService,
@@ -772,6 +782,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$PushNotificationService,
 		$QueryService,
 		$ReactionService,
+		$ReactionsBufferingService,
 		$RelayService,
 		$RoleService,
 		$S3Service,
@@ -791,6 +802,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$VideoProcessingService,
 		$UserWebhookService,
 		$SystemWebhookService,
+		$WebhookTestService,
 		$UtilityService,
 		$FileInfoService,
 		$SearchService,
diff --git a/packages/backend/src/core/DownloadService.ts b/packages/backend/src/core/DownloadService.ts
index 21ae798f9f..93f4a38246 100644
--- a/packages/backend/src/core/DownloadService.ts
+++ b/packages/backend/src/core/DownloadService.ts
@@ -42,7 +42,7 @@ export class DownloadService {
 
 		const timeout = 30 * 1000;
 		const operationTimeout = 60 * 1000;
-		const maxSize = this.config.maxFileSize ?? 262144000;
+		const maxSize = this.config.maxFileSize;
 
 		const urlObj = new URL(url);
 		let filename = urlObj.pathname.split('/').pop() ?? 'untitled';
diff --git a/packages/backend/src/core/DriveService.ts b/packages/backend/src/core/DriveService.ts
index 8aa04b4da7..c332e5a0a8 100644
--- a/packages/backend/src/core/DriveService.ts
+++ b/packages/backend/src/core/DriveService.ts
@@ -11,11 +11,10 @@ import { sharpBmp } from '@misskey-dev/sharp-read-bmp';
 import { IsNull } from 'typeorm';
 import { DeleteObjectCommandInput, PutObjectCommandInput, NoSuchKey } from '@aws-sdk/client-s3';
 import { DI } from '@/di-symbols.js';
-import type { DriveFilesRepository, UsersRepository, DriveFoldersRepository, UserProfilesRepository } from '@/models/_.js';
+import type { DriveFilesRepository, UsersRepository, DriveFoldersRepository, UserProfilesRepository, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import Logger from '@/logger.js';
 import type { MiRemoteUser, MiUser } from '@/models/User.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiDriveFile } from '@/models/DriveFile.js';
 import { IdService } from '@/core/IdService.js';
 import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
@@ -99,6 +98,9 @@ export class DriveService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -115,7 +117,6 @@ export class DriveService {
 		private userEntityService: UserEntityService,
 		private driveFileEntityService: DriveFileEntityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private downloadService: DownloadService,
 		private internalStorageService: InternalStorageService,
 		private s3Service: S3Service,
@@ -149,9 +150,7 @@ export class DriveService {
 	// thunbnail, webpublic を必要なら生成
 		const alts = await this.generateAlts(path, type, !file.uri);
 
-		const meta = await this.metaService.fetch();
-
-		if (meta.useObjectStorage) {
+		if (this.meta.useObjectStorage) {
 		//#region ObjectStorage params
 			let [ext] = (name.match(/\.([a-zA-Z0-9_-]+)$/) ?? ['']);
 
@@ -170,11 +169,11 @@ export class DriveService {
 				ext = '';
 			}
 
-			const baseUrl = meta.objectStorageBaseUrl
-				?? `${ meta.objectStorageUseSSL ? 'https' : 'http' }://${ meta.objectStorageEndpoint }${ meta.objectStoragePort ? `:${meta.objectStoragePort}` : '' }/${ meta.objectStorageBucket }`;
+			const baseUrl = this.meta.objectStorageBaseUrl
+				?? `${ this.meta.objectStorageUseSSL ? 'https' : 'http' }://${ this.meta.objectStorageEndpoint }${ this.meta.objectStoragePort ? `:${this.meta.objectStoragePort}` : '' }/${ this.meta.objectStorageBucket }`;
 
 			// for original
-			const key = `${meta.objectStoragePrefix}/${randomUUID()}${ext}`;
+			const key = `${this.meta.objectStoragePrefix}/${randomUUID()}${ext}`;
 			const url = `${ baseUrl }/${ key }`;
 
 			// for alts
@@ -191,7 +190,7 @@ export class DriveService {
 			];
 
 			if (alts.webpublic) {
-				webpublicKey = `${meta.objectStoragePrefix}/webpublic-${randomUUID()}.${alts.webpublic.ext}`;
+				webpublicKey = `${this.meta.objectStoragePrefix}/webpublic-${randomUUID()}.${alts.webpublic.ext}`;
 				webpublicUrl = `${ baseUrl }/${ webpublicKey }`;
 
 				this.registerLogger.info(`uploading webpublic: ${webpublicKey}`);
@@ -199,7 +198,7 @@ export class DriveService {
 			}
 
 			if (alts.thumbnail) {
-				thumbnailKey = `${meta.objectStoragePrefix}/thumbnail-${randomUUID()}.${alts.thumbnail.ext}`;
+				thumbnailKey = `${this.meta.objectStoragePrefix}/thumbnail-${randomUUID()}.${alts.thumbnail.ext}`;
 				thumbnailUrl = `${ baseUrl }/${ thumbnailKey }`;
 
 				this.registerLogger.info(`uploading thumbnail: ${thumbnailKey}`);
@@ -376,10 +375,8 @@ export class DriveService {
 		if (type === 'image/apng') type = 'image/png';
 		if (!FILE_TYPE_BROWSERSAFE.includes(type)) type = 'application/octet-stream';
 
-		const meta = await this.metaService.fetch();
-
 		const params = {
-			Bucket: meta.objectStorageBucket,
+			Bucket: this.meta.objectStorageBucket,
 			Key: key,
 			Body: stream,
 			ContentType: type,
@@ -392,9 +389,9 @@ export class DriveService {
 			// 許可されているファイル形式でしか拡張子をつけない
 			ext ? correctFilename(filename, ext) : filename,
 		);
-		if (meta.objectStorageSetPublicRead) params.ACL = 'public-read';
+		if (this.meta.objectStorageSetPublicRead) params.ACL = 'public-read';
 
-		await this.s3Service.upload(meta, params)
+		await this.s3Service.upload(this.meta, params)
 			.then(
 				result => {
 					if ('Bucket' in result) { // CompleteMultipartUploadCommandOutput
@@ -460,32 +457,31 @@ export class DriveService {
 		ext = null,
 	}: AddFileArgs): Promise<MiDriveFile> {
 		let skipNsfwCheck = false;
-		const instance = await this.metaService.fetch();
 		const userRoleNSFW = user && (await this.roleService.getUserPolicies(user.id)).alwaysMarkNsfw;
 		if (user == null) {
 			skipNsfwCheck = true;
 		} else if (userRoleNSFW) {
 			skipNsfwCheck = true;
 		}
-		if (instance.sensitiveMediaDetection === 'none') skipNsfwCheck = true;
-		if (user && instance.sensitiveMediaDetection === 'local' && this.userEntityService.isRemoteUser(user)) skipNsfwCheck = true;
-		if (user && instance.sensitiveMediaDetection === 'remote' && this.userEntityService.isLocalUser(user)) skipNsfwCheck = true;
+		if (this.meta.sensitiveMediaDetection === 'none') skipNsfwCheck = true;
+		if (user && this.meta.sensitiveMediaDetection === 'local' && this.userEntityService.isRemoteUser(user)) skipNsfwCheck = true;
+		if (user && this.meta.sensitiveMediaDetection === 'remote' && this.userEntityService.isLocalUser(user)) skipNsfwCheck = true;
 
 		const info = await this.fileInfoService.getFileInfo(path, {
 			skipSensitiveDetection: skipNsfwCheck,
 			sensitiveThreshold: // 感度が高いほどしきい値は低くすることになる
-			instance.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 0.1 :
-			instance.sensitiveMediaDetectionSensitivity === 'high' ? 0.3 :
-			instance.sensitiveMediaDetectionSensitivity === 'low' ? 0.7 :
-			instance.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0.9 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 0.1 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'high' ? 0.3 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'low' ? 0.7 :
+			this.meta.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0.9 :
 			0.5,
 			sensitiveThresholdForPorn: 0.75,
-			enableSensitiveMediaDetectionForVideos: instance.enableSensitiveMediaDetectionForVideos,
+			enableSensitiveMediaDetectionForVideos: this.meta.enableSensitiveMediaDetectionForVideos,
 		});
 		this.registerLogger.info(`${JSON.stringify(info)}`);
 
 		// 現状 false positive が多すぎて実用に耐えない
-		//if (info.porn && instance.disallowUploadWhenPredictedAsPorn) {
+		//if (info.porn && this.meta.disallowUploadWhenPredictedAsPorn) {
 		//	throw new IdentifiableError('282f77bf-5816-4f72-9264-aa14d8261a21', 'Detected as porn.');
 		//}
 
@@ -589,9 +585,9 @@ export class DriveService {
 			sensitive ?? false
 			: false;
 
-		if (user && this.utilityService.isMediaSilencedHost(instance.mediaSilencedHosts, user.host)) file.isSensitive = true;
+		if (user && this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, user.host)) file.isSensitive = true;
 		if (info.sensitive && profile!.autoSensitive) file.isSensitive = true;
-		if (info.sensitive && instance.setSensitiveFlagAutomatically) file.isSensitive = true;
+		if (info.sensitive && this.meta.setSensitiveFlagAutomatically) file.isSensitive = true;
 		if (userRoleNSFW) file.isSensitive = true;
 
 		if (url !== null) {
@@ -652,7 +648,7 @@ export class DriveService {
 			// ローカルユーザーのみ
 			this.perUserDriveChart.update(file, true);
 		} else {
-			if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.updateDrive(file, true);
 			}
 		}
@@ -798,7 +794,7 @@ export class DriveService {
 			// ローカルユーザーのみ
 			this.perUserDriveChart.update(file, false);
 		} else {
-			if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.updateDrive(file, false);
 			}
 		}
@@ -820,14 +816,13 @@ export class DriveService {
 
 	@bindThis
 	public async deleteObjectStorageFile(key: string) {
-		const meta = await this.metaService.fetch();
 		try {
 			const param = {
-				Bucket: meta.objectStorageBucket,
+				Bucket: this.meta.objectStorageBucket,
 				Key: key,
 			} as DeleteObjectCommandInput;
 
-			await this.s3Service.delete(meta, param);
+			await this.s3Service.delete(this.meta, param);
 		} catch (err: any) {
 			if (err.name === 'NoSuchKey') {
 				this.deleteLogger.warn(`The object storage had no such key to delete: ${key}. Skipping this.`, err as Error);
diff --git a/packages/backend/src/core/EmailService.ts b/packages/backend/src/core/EmailService.ts
index 435dbbae28..a176474b95 100644
--- a/packages/backend/src/core/EmailService.ts
+++ b/packages/backend/src/core/EmailService.ts
@@ -5,18 +5,17 @@
 
 import { URLSearchParams } from 'node:url';
 import * as nodemailer from 'nodemailer';
+import juice from 'juice';
 import { Inject, Injectable } from '@nestjs/common';
 import { validate as validateEmail } from 'deep-email-validator';
-import { MetaService } from '@/core/MetaService.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type Logger from '@/logger.js';
-import type { UserProfilesRepository } from '@/models/_.js';
+import type { MiMeta, UserProfilesRepository } from '@/models/_.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
-import { QueueService } from '@/core/QueueService.js';
 
 @Injectable()
 export class EmailService {
@@ -26,49 +25,41 @@ export class EmailService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.userProfilesRepository)
 		private userProfilesRepository: UserProfilesRepository,
 
-		private metaService: MetaService,
 		private loggerService: LoggerService,
 		private utilityService: UtilityService,
 		private httpRequestService: HttpRequestService,
-		private queueService: QueueService,
 	) {
 		this.logger = this.loggerService.getLogger('email');
 	}
 
 	@bindThis
 	public async sendEmail(to: string, subject: string, html: string, text: string) {
-		const meta = await this.metaService.fetch(true);
-
-		if (!meta.enableEmail) return;
+		if (!this.meta.enableEmail) return;
 
 		const iconUrl = `${this.config.url}/static-assets/mi-white.png`;
 		const emailSettingUrl = `${this.config.url}/settings/email`;
 
-		const enableAuth = meta.smtpUser != null && meta.smtpUser !== '';
+		const enableAuth = this.meta.smtpUser != null && this.meta.smtpUser !== '';
 
 		const transporter = nodemailer.createTransport({
-			host: meta.smtpHost,
-			port: meta.smtpPort,
-			secure: meta.smtpSecure,
+			host: this.meta.smtpHost,
+			port: this.meta.smtpPort,
+			secure: this.meta.smtpSecure,
 			ignoreTLS: !enableAuth,
 			proxy: this.config.proxySmtp,
 			auth: enableAuth ? {
-				user: meta.smtpUser,
-				pass: meta.smtpPass,
+				user: this.meta.smtpUser,
+				pass: this.meta.smtpPass,
 			} : undefined,
 		} as any);
 
-		try {
-			// TODO: htmlサニタイズ
-			const info = await transporter.sendMail({
-				from: meta.email!,
-				to: to,
-				subject: subject,
-				text: text,
-				html: `<!doctype html>
+		const htmlContent = `<!doctype html>
 <html>
 	<head>
 		<meta charset="utf-8">
@@ -133,7 +124,7 @@ export class EmailService {
 	<body>
 		<main>
 			<header>
-				<img src="${ meta.logoImageUrl ?? meta.iconUrl ?? iconUrl }"/>
+				<img src="${ this.meta.logoImageUrl ?? this.meta.iconUrl ?? iconUrl }"/>
 			</header>
 			<article>
 				<h1>${ subject }</h1>
@@ -147,7 +138,18 @@ export class EmailService {
 			<a href="${ this.config.url }">${ this.config.host }</a>
 		</nav>
 	</body>
-</html>`,
+</html>`;
+
+		const inlinedHtml = juice(htmlContent);
+
+		try {
+			// TODO: htmlサニタイズ
+			const info = await transporter.sendMail({
+				from: this.meta.email!,
+				to: to,
+				subject: subject,
+				text: text,
+				html: inlinedHtml,
 			});
 
 			this.logger.info(`Message sent: ${info.messageId}`);
@@ -162,8 +164,6 @@ export class EmailService {
 		available: boolean;
 		reason: null | 'used' | 'format' | 'disposable' | 'mx' | 'smtp' | 'banned' | 'network' | 'blacklist';
 	}> {
-		const meta = await this.metaService.fetch();
-
 		const exist = await this.userProfilesRepository.countBy({
 			emailVerified: true,
 			email: emailAddress,
@@ -181,11 +181,11 @@ export class EmailService {
 			reason?: string | null,
 		} = { valid: true, reason: null };
 
-		if (meta.enableActiveEmailValidation) {
-			if (meta.enableVerifymailApi && meta.verifymailAuthKey != null) {
-				validated = await this.verifyMail(emailAddress, meta.verifymailAuthKey);
-			} else if (meta.enableTruemailApi && meta.truemailInstance && meta.truemailAuthKey != null) {
-				validated = await this.trueMail(meta.truemailInstance, emailAddress, meta.truemailAuthKey);
+		if (this.meta.enableActiveEmailValidation) {
+			if (this.meta.enableVerifymailApi && this.meta.verifymailAuthKey != null) {
+				validated = await this.verifyMail(emailAddress, this.meta.verifymailAuthKey);
+			} else if (this.meta.enableTruemailApi && this.meta.truemailInstance && this.meta.truemailAuthKey != null) {
+				validated = await this.trueMail(this.meta.truemailInstance, emailAddress, this.meta.truemailAuthKey);
 			} else {
 				validated = await validateEmail({
 					email: emailAddress,
@@ -215,7 +215,7 @@ export class EmailService {
 		}
 
 		const emailDomain: string = emailAddress.split('@')[1];
-		const isBanned = this.utilityService.isBlockedHost(meta.bannedEmailDomains, emailDomain);
+		const isBanned = this.utilityService.isBlockedHost(this.meta.bannedEmailDomains, emailDomain);
 
 		if (isBanned) {
 			return {
diff --git a/packages/backend/src/core/GlobalEventService.ts b/packages/backend/src/core/GlobalEventService.ts
index 87aa70713e..03646ff566 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -241,7 +241,7 @@ export interface InternalEventTypes {
 	avatarDecorationCreated: MiAvatarDecoration;
 	avatarDecorationDeleted: MiAvatarDecoration;
 	avatarDecorationUpdated: MiAvatarDecoration;
-	metaUpdated: MiMeta;
+	metaUpdated: { before?: MiMeta; after: MiMeta; };
 	followChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
 	unfollowChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
 	updateUserProfile: MiUserProfile;
diff --git a/packages/backend/src/core/HashtagService.ts b/packages/backend/src/core/HashtagService.ts
index eb192ee6da..793bbeecb1 100644
--- a/packages/backend/src/core/HashtagService.ts
+++ b/packages/backend/src/core/HashtagService.ts
@@ -10,16 +10,18 @@ import type { MiUser } from '@/models/User.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import { IdService } from '@/core/IdService.js';
 import type { MiHashtag } from '@/models/Hashtag.js';
-import type { HashtagsRepository } from '@/models/_.js';
+import type { HashtagsRepository, MiMeta } from '@/models/_.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { UtilityService } from '@/core/UtilityService.js';
 
 @Injectable()
 export class HashtagService {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.redis)
 		private redisClient: Redis.Redis, // TODO: 専用のRedisサーバーを設定できるようにする
 
@@ -29,7 +31,6 @@ export class HashtagService {
 		private userEntityService: UserEntityService,
 		private featuredService: FeaturedService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private utilityService: UtilityService,
 	) {
 	}
@@ -160,10 +161,9 @@ export class HashtagService {
 
 	@bindThis
 	public async updateHashtagsRanking(hashtag: string, userId: MiUser['id']): Promise<void> {
-		const instance = await this.metaService.fetch();
-		const hiddenTags = instance.hiddenTags.map(t => normalizeForSearch(t));
+		const hiddenTags = this.meta.hiddenTags.map(t => normalizeForSearch(t));
 		if (hiddenTags.includes(hashtag)) return;
-		if (this.utilityService.isKeyWordIncluded(hashtag, instance.sensitiveWords)) return;
+		if (this.utilityService.isKeyWordIncluded(hashtag, this.meta.sensitiveWords)) return;
 
 		// YYYYMMDDHHmm (10分間隔)
 		const now = new Date();
diff --git a/packages/backend/src/core/MetaService.ts b/packages/backend/src/core/MetaService.ts
index ec630f804e..3d88d0aefe 100644
--- a/packages/backend/src/core/MetaService.ts
+++ b/packages/backend/src/core/MetaService.ts
@@ -52,7 +52,7 @@ export class MetaService implements OnApplicationShutdown {
 			switch (type) {
 				case 'metaUpdated': {
 					this.cache = { // TODO: このあたりのデシリアライズ処理は各modelファイル内に関数としてexportしたい
-						...body,
+						...(body.after),
 						proxyAccount: null, // joinなカラムは通常取ってこないので
 					};
 					break;
@@ -141,7 +141,7 @@ export class MetaService implements OnApplicationShutdown {
 			});
 		}
 
-		this.globalEventService.publishInternalEvent('metaUpdated', updated);
+		this.globalEventService.publishInternalEvent('metaUpdated', { before, after: updated });
 
 		return updated;
 	}
diff --git a/packages/backend/src/core/MfmService.ts b/packages/backend/src/core/MfmService.ts
index 74536c68f5..d33b228c3d 100644
--- a/packages/backend/src/core/MfmService.ts
+++ b/packages/backend/src/core/MfmService.ts
@@ -239,7 +239,7 @@ export class MfmService {
 			return null;
 		}
 
-		const { window } = new Window();
+		const { happyDOM, window } = new Window();
 
 		const doc = window.document;
 
@@ -457,6 +457,10 @@ export class MfmService {
 
 		appendChildren(nodes, body);
 
-		return new XMLSerializer().serializeToString(body);
+		const serialized = new XMLSerializer().serializeToString(body);
+
+		happyDOM.close().catch(err => {});
+
+		return serialized;
 	}
 }
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 1d8d248322..89e3eafa0e 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -8,13 +8,12 @@ import * as mfm from 'mfm-js';
 import { In, DataSource, IsNull, LessThan } from 'typeorm';
 import * as Redis from 'ioredis';
 import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
-import RE2 from 're2';
 import { extractMentions } from '@/misc/extract-mentions.js';
 import { extractCustomEmojisFromMfm } from '@/misc/extract-custom-emojis-from-mfm.js';
 import { extractHashtags } from '@/misc/extract-hashtags.js';
 import type { IMentionedRemoteUsers } from '@/models/Note.js';
 import { MiNote } from '@/models/Note.js';
-import type { ChannelFollowingsRepository, ChannelsRepository, FollowingsRepository, InstancesRepository, MiFollowing, MutingsRepository, NotesRepository, NoteThreadMutingsRepository, UserListMembershipsRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type { ChannelFollowingsRepository, ChannelsRepository, FollowingsRepository, InstancesRepository, MiFollowing, MiMeta, MutingsRepository, NotesRepository, NoteThreadMutingsRepository, UserListMembershipsRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import type { MiApp } from '@/models/App.js';
 import { concat } from '@/misc/prelude/array.js';
@@ -23,11 +22,8 @@ import type { MiUser, MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import type { IPoll } from '@/models/Poll.js';
 import { MiPoll } from '@/models/Poll.js';
 import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
-import { checkWordMute } from '@/misc/check-word-mute.js';
 import type { MiChannel } from '@/models/Channel.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
-import { MemorySingleCache } from '@/misc/cache.js';
-import type { MiUserProfile } from '@/models/UserProfile.js';
 import { RelayService } from '@/core/RelayService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { DI } from '@/di-symbols.js';
@@ -51,7 +47,6 @@ import { RemoteUserResolveService } from '@/core/RemoteUserResolveService.js';
 import { bindThis } from '@/decorators.js';
 import { DB_MAX_NOTE_TEXT_LENGTH } from '@/const.js';
 import { RoleService } from '@/core/RoleService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { SearchService } from '@/core/SearchService.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
 import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
@@ -60,6 +55,7 @@ import { UserBlockingService } from '@/core/UserBlockingService.js';
 import { isReply } from '@/misc/is-reply.js';
 import { trackPromise } from '@/misc/promise-tracker.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
+import { CollapsedQueue } from '@/misc/collapsed-queue.js';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
@@ -151,11 +147,15 @@ type Option = {
 @Injectable()
 export class NoteCreateService implements OnApplicationShutdown {
 	#shutdownController = new AbortController();
+	private updateNotesCountQueue: CollapsedQueue<MiNote['id'], number>;
 
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.db)
 		private db: DataSource,
 
@@ -210,7 +210,6 @@ export class NoteCreateService implements OnApplicationShutdown {
 		private apDeliverManagerService: ApDeliverManagerService,
 		private apRendererService: ApRendererService,
 		private roleService: RoleService,
-		private metaService: MetaService,
 		private searchService: SearchService,
 		private notesChart: NotesChart,
 		private perUserNotesChart: PerUserNotesChart,
@@ -218,7 +217,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 		private instanceChart: InstanceChart,
 		private utilityService: UtilityService,
 		private userBlockingService: UserBlockingService,
-	) { }
+	) {
+		this.updateNotesCountQueue = new CollapsedQueue(60 * 1000 * 5, this.collapseNotesCount, this.performUpdateNotesCount);
+	}
 
 	@bindThis
 	public async create(user: {
@@ -251,10 +252,8 @@ export class NoteCreateService implements OnApplicationShutdown {
 		if (data.channel != null) data.visibleUsers = [];
 		if (data.channel != null) data.localOnly = true;
 
-		const meta = await this.metaService.fetch();
-
 		if (data.visibility === 'public' && data.channel == null) {
-			const sensitiveWords = meta.sensitiveWords;
+			const sensitiveWords = this.meta.sensitiveWords;
 			if (this.utilityService.isKeyWordIncluded(data.cw ?? data.text ?? '', sensitiveWords)) {
 				data.visibility = 'home';
 			} else if ((await this.roleService.getUserPolicies(user.id)).canPublicNote === false) {
@@ -262,17 +261,17 @@ export class NoteCreateService implements OnApplicationShutdown {
 			}
 		}
 
-		const hasProhibitedWords = await this.checkProhibitedWordsContain({
+		const hasProhibitedWords = this.checkProhibitedWordsContain({
 			cw: data.cw,
 			text: data.text,
 			pollChoices: data.poll?.choices,
-		}, meta.prohibitedWords);
+		}, this.meta.prohibitedWords);
 
 		if (hasProhibitedWords) {
 			throw new IdentifiableError('689ee33f-f97c-479a-ac49-1b9f8140af99', 'Note contains prohibited words');
 		}
 
-		const inSilencedInstance = this.utilityService.isSilencedHost(meta.silencedHosts, user.host);
+		const inSilencedInstance = this.utilityService.isSilencedHost(this.meta.silencedHosts, user.host);
 
 		if (data.visibility === 'public' && inSilencedInstance && user.host !== null) {
 			data.visibility = 'home';
@@ -365,7 +364,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 
 		// if the host is media-silenced, custom emojis are not allowed
-		if (this.utilityService.isMediaSilencedHost(meta.mediaSilencedHosts, user.host)) emojis = [];
+		if (this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, user.host)) emojis = [];
 
 		tags = tags.filter(tag => Array.from(tag).length <= 128).splice(0, 32);
 
@@ -506,18 +505,16 @@ export class NoteCreateService implements OnApplicationShutdown {
 		host: MiUser['host'];
 		isBot: MiUser['isBot'];
 	}, data: Option, silent: boolean, tags: string[], mentionedUsers: MinimumUser[]) {
-		const meta = await this.metaService.fetch();
-
 		this.notesChart.update(note, true);
-		if (note.visibility !== 'specified' && (meta.enableChartsForRemoteUser || (user.host == null))) {
+		if (note.visibility !== 'specified' && (this.meta.enableChartsForRemoteUser || (user.host == null))) {
 			this.perUserNotesChart.update(user, note, true);
 		}
 
 		// Register host
 		if (this.userEntityService.isRemoteUser(user)) {
 			this.federatedInstanceService.fetch(user.host).then(async i => {
-				this.instancesRepository.increment({ id: i.id }, 'notesCount', 1);
-				if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+				this.updateNotesCountQueue.enqueue(i.id, 1);
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.updateNote(i.host, note, true);
 				}
 			});
@@ -853,15 +850,14 @@ export class NoteCreateService implements OnApplicationShutdown {
 
 	@bindThis
 	private async pushToTl(note: MiNote, user: { id: MiUser['id']; host: MiUser['host']; }) {
-		const meta = await this.metaService.fetch();
-		if (!meta.enableFanoutTimeline) return;
+		if (!this.meta.enableFanoutTimeline) return;
 
 		const r = this.redisForTimelines.pipeline();
 
 		if (note.channelId) {
 			this.fanoutTimelineService.push(`channelTimeline:${note.channelId}`, note.id, this.config.perChannelMaxNoteCacheCount, r);
 
-			this.fanoutTimelineService.push(`userTimelineWithChannel:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
+			this.fanoutTimelineService.push(`userTimelineWithChannel:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax : this.meta.perRemoteUserUserTimelineCacheMax, r);
 
 			const channelFollowings = await this.channelFollowingsRepository.find({
 				where: {
@@ -871,9 +867,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 			});
 
 			for (const channelFollowing of channelFollowings) {
-				this.fanoutTimelineService.push(`homeTimeline:${channelFollowing.followerId}`, note.id, meta.perUserHomeTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`homeTimeline:${channelFollowing.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`homeTimelineWithFiles:${channelFollowing.followerId}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`homeTimelineWithFiles:${channelFollowing.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax / 2, r);
 				}
 			}
 		} else {
@@ -911,9 +907,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 					if (!following.withReplies) continue;
 				}
 
-				this.fanoutTimelineService.push(`homeTimeline:${following.followerId}`, note.id, meta.perUserHomeTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`homeTimeline:${following.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`homeTimelineWithFiles:${following.followerId}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`homeTimelineWithFiles:${following.followerId}`, note.id, this.meta.perUserHomeTimelineCacheMax / 2, r);
 				}
 			}
 
@@ -930,25 +926,25 @@ export class NoteCreateService implements OnApplicationShutdown {
 					if (!userListMembership.withReplies) continue;
 				}
 
-				this.fanoutTimelineService.push(`userListTimeline:${userListMembership.userListId}`, note.id, meta.perUserListTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`userListTimeline:${userListMembership.userListId}`, note.id, this.meta.perUserListTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`userListTimelineWithFiles:${userListMembership.userListId}`, note.id, meta.perUserListTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`userListTimelineWithFiles:${userListMembership.userListId}`, note.id, this.meta.perUserListTimelineCacheMax / 2, r);
 				}
 			}
 
 			// 自分自身のHTL
 			if (note.userHost == null) {
 				if (note.visibility !== 'specified' || !note.visibleUserIds.some(v => v === user.id)) {
-					this.fanoutTimelineService.push(`homeTimeline:${user.id}`, note.id, meta.perUserHomeTimelineCacheMax, r);
+					this.fanoutTimelineService.push(`homeTimeline:${user.id}`, note.id, this.meta.perUserHomeTimelineCacheMax, r);
 					if (note.fileIds.length > 0) {
-						this.fanoutTimelineService.push(`homeTimelineWithFiles:${user.id}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
+						this.fanoutTimelineService.push(`homeTimelineWithFiles:${user.id}`, note.id, this.meta.perUserHomeTimelineCacheMax / 2, r);
 					}
 				}
 			}
 
 			// 自分自身以外への返信
 			if (isReply(note)) {
-				this.fanoutTimelineService.push(`userTimelineWithReplies:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`userTimelineWithReplies:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax : this.meta.perRemoteUserUserTimelineCacheMax, r);
 
 				if (note.visibility === 'public' && note.userHost == null) {
 					this.fanoutTimelineService.push('localTimelineWithReplies', note.id, 300, r);
@@ -957,9 +953,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 					}
 				}
 			} else {
-				this.fanoutTimelineService.push(`userTimeline:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
+				this.fanoutTimelineService.push(`userTimeline:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax : this.meta.perRemoteUserUserTimelineCacheMax, r);
 				if (note.fileIds.length > 0) {
-					this.fanoutTimelineService.push(`userTimelineWithFiles:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax / 2 : meta.perRemoteUserUserTimelineCacheMax / 2, r);
+					this.fanoutTimelineService.push(`userTimelineWithFiles:${user.id}`, note.id, note.userHost == null ? this.meta.perLocalUserUserTimelineCacheMax / 2 : this.meta.perRemoteUserUserTimelineCacheMax / 2, r);
 				}
 
 				if (note.visibility === 'public' && note.userHost == null) {
@@ -1018,9 +1014,9 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 	}
 
-	public async checkProhibitedWordsContain(content: Parameters<UtilityService['concatNoteContentsForKeyWordCheck']>[0], prohibitedWords?: string[]) {
+	public checkProhibitedWordsContain(content: Parameters<UtilityService['concatNoteContentsForKeyWordCheck']>[0], prohibitedWords?: string[]) {
 		if (prohibitedWords == null) {
-			prohibitedWords = (await this.metaService.fetch()).prohibitedWords;
+			prohibitedWords = this.meta.prohibitedWords;
 		}
 
 		if (
@@ -1036,12 +1032,23 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	public dispose(): void {
+	private collapseNotesCount(oldValue: number, newValue: number) {
+		return oldValue + newValue;
+	}
+
+	@bindThis
+	private async performUpdateNotesCount(id: MiNote['id'], incrBy: number) {
+		await this.instancesRepository.increment({ id: id }, 'notesCount', incrBy);
+	}
+
+	@bindThis
+	public async dispose(): Promise<void> {
 		this.#shutdownController.abort();
+		await this.updateNotesCountQueue.performAllNow();
 	}
 
 	@bindThis
-	public onApplicationShutdown(signal?: string | undefined): void {
-		this.dispose();
+	public async onApplicationShutdown(signal?: string | undefined): Promise<void> {
+		await this.dispose();
 	}
 }
diff --git a/packages/backend/src/core/NoteDeleteService.ts b/packages/backend/src/core/NoteDeleteService.ts
index b7c01c64c8..f9f8ace386 100644
--- a/packages/backend/src/core/NoteDeleteService.ts
+++ b/packages/backend/src/core/NoteDeleteService.ts
@@ -7,7 +7,7 @@ import { Brackets, In } from 'typeorm';
 import { Injectable, Inject } from '@nestjs/common';
 import type { MiUser, MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import type { MiNote, IMentionedRemoteUsers } from '@/models/Note.js';
-import type { InstancesRepository, NotesRepository, UsersRepository } from '@/models/_.js';
+import type { InstancesRepository, MiMeta, NotesRepository, UsersRepository } from '@/models/_.js';
 import { RelayService } from '@/core/RelayService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { DI } from '@/di-symbols.js';
@@ -19,9 +19,7 @@ import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
-import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { SearchService } from '@/core/SearchService.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
 import { isQuote, isRenote } from '@/misc/is-renote.js';
@@ -32,6 +30,9 @@ export class NoteDeleteService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -42,13 +43,11 @@ export class NoteDeleteService {
 		private instancesRepository: InstancesRepository,
 
 		private userEntityService: UserEntityService,
-		private noteEntityService: NoteEntityService,
 		private globalEventService: GlobalEventService,
 		private relayService: RelayService,
 		private federatedInstanceService: FederatedInstanceService,
 		private apRendererService: ApRendererService,
 		private apDeliverManagerService: ApDeliverManagerService,
-		private metaService: MetaService,
 		private searchService: SearchService,
 		private moderationLogService: ModerationLogService,
 		private notesChart: NotesChart,
@@ -102,17 +101,15 @@ export class NoteDeleteService {
 			}
 			//#endregion
 
-			const meta = await this.metaService.fetch();
-
 			this.notesChart.update(note, false);
-			if (meta.enableChartsForRemoteUser || (user.host == null)) {
+			if (this.meta.enableChartsForRemoteUser || (user.host == null)) {
 				this.perUserNotesChart.update(user, note, false);
 			}
 
 			if (this.userEntityService.isRemoteUser(user)) {
 				this.federatedInstanceService.fetch(user.host).then(async i => {
 					this.instancesRepository.decrement({ id: i.id }, 'notesCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateNote(i.host, note, false);
 					}
 				});
diff --git a/packages/backend/src/core/ProxyAccountService.ts b/packages/backend/src/core/ProxyAccountService.ts
index 71d663bf90..c3ff2a68d3 100644
--- a/packages/backend/src/core/ProxyAccountService.ts
+++ b/packages/backend/src/core/ProxyAccountService.ts
@@ -4,26 +4,25 @@
  */
 
 import { Inject, Injectable } from '@nestjs/common';
-import type { UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsersRepository } from '@/models/_.js';
 import type { MiLocalUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 
 @Injectable()
 export class ProxyAccountService {
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
-
-		private metaService: MetaService,
 	) {
 	}
 
 	@bindThis
 	public async fetch(): Promise<MiLocalUser | null> {
-		const meta = await this.metaService.fetch();
-		if (meta.proxyAccountId == null) return null;
-		return await this.usersRepository.findOneByOrFail({ id: meta.proxyAccountId }) as MiLocalUser;
+		if (this.meta.proxyAccountId == null) return null;
+		return await this.usersRepository.findOneByOrFail({ id: this.meta.proxyAccountId }) as MiLocalUser;
 	}
 }
diff --git a/packages/backend/src/core/PushNotificationService.ts b/packages/backend/src/core/PushNotificationService.ts
index 6a845b951d..1479bb00d9 100644
--- a/packages/backend/src/core/PushNotificationService.ts
+++ b/packages/backend/src/core/PushNotificationService.ts
@@ -10,8 +10,7 @@ import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type { Packed } from '@/misc/json-schema.js';
 import { getNoteSummary } from '@/misc/get-note-summary.js';
-import type { MiSwSubscription, SwSubscriptionsRepository } from '@/models/_.js';
-import { MetaService } from '@/core/MetaService.js';
+import type { MiMeta, MiSwSubscription, SwSubscriptionsRepository } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import { RedisKVCache } from '@/misc/cache.js';
 
@@ -54,13 +53,14 @@ export class PushNotificationService implements OnApplicationShutdown {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.redis)
 		private redisClient: Redis.Redis,
 
 		@Inject(DI.swSubscriptionsRepository)
 		private swSubscriptionsRepository: SwSubscriptionsRepository,
-
-		private metaService: MetaService,
 	) {
 		this.subscriptionsCache = new RedisKVCache<MiSwSubscription[]>(this.redisClient, 'userSwSubscriptions', {
 			lifetime: 1000 * 60 * 60 * 1, // 1h
@@ -73,14 +73,12 @@ export class PushNotificationService implements OnApplicationShutdown {
 
 	@bindThis
 	public async pushNotification<T extends keyof PushNotificationsTypes>(userId: string, type: T, body: PushNotificationsTypes[T]) {
-		const meta = await this.metaService.fetch();
-
-		if (!meta.enableServiceWorker || meta.swPublicKey == null || meta.swPrivateKey == null) return;
+		if (!this.meta.enableServiceWorker || this.meta.swPublicKey == null || this.meta.swPrivateKey == null) return;
 
 		// アプリケーションの連絡先と、サーバーサイドの鍵ペアの情報を登録
 		push.setVapidDetails(this.config.url,
-			meta.swPublicKey,
-			meta.swPrivateKey);
+			this.meta.swPublicKey,
+			this.meta.swPrivateKey);
 
 		const subscriptions = await this.subscriptionsCache.fetch(userId);
 
diff --git a/packages/backend/src/core/QueueService.ts b/packages/backend/src/core/QueueService.ts
index 80827a500b..f35e456556 100644
--- a/packages/backend/src/core/QueueService.ts
+++ b/packages/backend/src/core/QueueService.ts
@@ -87,6 +87,12 @@ export class QueueService {
 			repeat: { pattern: '*/5 * * * *' },
 			removeOnComplete: true,
 		});
+
+		this.systemQueue.add('bakeBufferedReactions', {
+		}, {
+			repeat: { pattern: '0 0 * * *' },
+			removeOnComplete: true,
+		});
 	}
 
 	@bindThis
@@ -452,10 +458,15 @@ export class QueueService {
 
 	/**
 	 * @see UserWebhookDeliverJobData
-	 * @see WebhookDeliverProcessorService
+	 * @see UserWebhookDeliverProcessorService
 	 */
 	@bindThis
-	public userWebhookDeliver(webhook: MiWebhook, type: typeof webhookEventTypes[number], content: unknown) {
+	public userWebhookDeliver(
+		webhook: MiWebhook,
+		type: typeof webhookEventTypes[number],
+		content: unknown,
+		opts?: { attempts?: number },
+	) {
 		const data: UserWebhookDeliverJobData = {
 			type,
 			content,
@@ -468,7 +479,7 @@ export class QueueService {
 		};
 
 		return this.userWebhookDeliverQueue.add(webhook.id, data, {
-			attempts: 4,
+			attempts: opts?.attempts ?? 4,
 			backoff: {
 				type: 'custom',
 			},
@@ -479,10 +490,15 @@ export class QueueService {
 
 	/**
 	 * @see SystemWebhookDeliverJobData
-	 * @see WebhookDeliverProcessorService
+	 * @see SystemWebhookDeliverProcessorService
 	 */
 	@bindThis
-	public systemWebhookDeliver(webhook: MiSystemWebhook, type: SystemWebhookEventType, content: unknown) {
+	public systemWebhookDeliver(
+		webhook: MiSystemWebhook,
+		type: SystemWebhookEventType,
+		content: unknown,
+		opts?: { attempts?: number },
+	) {
 		const data: SystemWebhookDeliverJobData = {
 			type,
 			content,
@@ -494,7 +510,7 @@ export class QueueService {
 		};
 
 		return this.systemWebhookDeliverQueue.add(webhook.id, data, {
-			attempts: 4,
+			attempts: opts?.attempts ?? 4,
 			backoff: {
 				type: 'custom',
 			},
diff --git a/packages/backend/src/core/ReactionService.ts b/packages/backend/src/core/ReactionService.ts
index 371207c33a..6f9fe53937 100644
--- a/packages/backend/src/core/ReactionService.ts
+++ b/packages/backend/src/core/ReactionService.ts
@@ -4,9 +4,8 @@
  */
 
 import { Inject, Injectable } from '@nestjs/common';
-import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
-import type { EmojisRepository, NoteReactionsRepository, UsersRepository, NotesRepository } from '@/models/_.js';
+import type { EmojisRepository, NoteReactionsRepository, UsersRepository, NotesRepository, MiMeta } from '@/models/_.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import type { MiRemoteUser, MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
@@ -21,7 +20,6 @@ import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerServ
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
@@ -30,9 +28,10 @@ import { RoleService } from '@/core/RoleService.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
 import { trackPromise } from '@/misc/promise-tracker.js';
 import { isQuote, isRenote } from '@/misc/is-renote.js';
+import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
+import { PER_NOTE_REACTION_USER_PAIR_CACHE_MAX } from '@/const.js';
 
 const FALLBACK = '\u2764';
-const PER_NOTE_REACTION_USER_PAIR_CACHE_MAX = 16;
 
 const legacies: Record<string, string> = {
 	'like': '👍',
@@ -71,8 +70,8 @@ const decodeCustomEmojiRegexp = /^:([\w+-]+)(?:@([\w.-]+))?:$/;
 @Injectable()
 export class ReactionService {
 	constructor(
-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
+		@Inject(DI.meta)
+		private meta: MiMeta,
 
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
@@ -87,12 +86,12 @@ export class ReactionService {
 		private emojisRepository: EmojisRepository,
 
 		private utilityService: UtilityService,
-		private metaService: MetaService,
 		private customEmojiService: CustomEmojiService,
 		private roleService: RoleService,
 		private userEntityService: UserEntityService,
 		private noteEntityService: NoteEntityService,
 		private userBlockingService: UserBlockingService,
+		private reactionsBufferingService: ReactionsBufferingService,
 		private idService: IdService,
 		private featuredService: FeaturedService,
 		private globalEventService: GlobalEventService,
@@ -105,8 +104,6 @@ export class ReactionService {
 
 	@bindThis
 	public async create(user: { id: MiUser['id']; host: MiUser['host']; isBot: MiUser['isBot'] }, note: MiNote, _reaction?: string | null) {
-		const meta = await this.metaService.fetch();
-
 		// Check blocking
 		if (note.userId !== user.id) {
 			const blocked = await this.userBlockingService.checkBlocked(note.userId, user.id);
@@ -152,7 +149,7 @@ export class ReactionService {
 						}
 
 						// for media silenced host, custom emoji reactions are not allowed
-						if (reacterHost != null && this.utilityService.isMediaSilencedHost(meta.mediaSilencedHosts, reacterHost)) {
+						if (reacterHost != null && this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, reacterHost)) {
 							reaction = FALLBACK;
 						}
 					} else {
@@ -174,7 +171,6 @@ export class ReactionService {
 			reaction,
 		};
 
-		// Create reaction
 		try {
 			await this.noteReactionsRepository.insert(record);
 		} catch (e) {
@@ -198,16 +194,20 @@ export class ReactionService {
 		}
 
 		// Increment reactions count
-		const sql = `jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + 1)::text::jsonb)`;
-		await this.notesRepository.createQueryBuilder().update()
-			.set({
-				reactions: () => sql,
-				...(note.reactionAndUserPairCache.length < PER_NOTE_REACTION_USER_PAIR_CACHE_MAX ? {
-					reactionAndUserPairCache: () => `array_append("reactionAndUserPairCache", '${user.id}/${reaction}')`,
-				} : {}),
-			})
-			.where('id = :id', { id: note.id })
-			.execute();
+		if (this.meta.enableReactionsBuffering) {
+			await this.reactionsBufferingService.create(note.id, user.id, reaction, note.reactionAndUserPairCache);
+		} else {
+			const sql = `jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + 1)::text::jsonb)`;
+			await this.notesRepository.createQueryBuilder().update()
+				.set({
+					reactions: () => sql,
+					...(note.reactionAndUserPairCache.length < PER_NOTE_REACTION_USER_PAIR_CACHE_MAX ? {
+						reactionAndUserPairCache: () => `array_append("reactionAndUserPairCache", '${user.id}/${reaction}')`,
+					} : {}),
+				})
+				.where('id = :id', { id: note.id })
+				.execute();
+		}
 
 		// 30%の確率、セルフではない、3日以内に投稿されたノートの場合ハイライト用ランキング更新
 		if (
@@ -227,7 +227,7 @@ export class ReactionService {
 			}
 		}
 
-		if (meta.enableChartsForRemoteUser || (user.host == null)) {
+		if (this.meta.enableChartsForRemoteUser || (user.host == null)) {
 			this.perUserReactionsChart.update(user, note);
 		}
 
@@ -305,14 +305,18 @@ export class ReactionService {
 		}
 
 		// Decrement reactions count
-		const sql = `jsonb_set("reactions", '{${exist.reaction}}', (COALESCE("reactions"->>'${exist.reaction}', '0')::int - 1)::text::jsonb)`;
-		await this.notesRepository.createQueryBuilder().update()
-			.set({
-				reactions: () => sql,
-				reactionAndUserPairCache: () => `array_remove("reactionAndUserPairCache", '${user.id}/${exist.reaction}')`,
-			})
-			.where('id = :id', { id: note.id })
-			.execute();
+		if (this.meta.enableReactionsBuffering) {
+			await this.reactionsBufferingService.delete(note.id, user.id, exist.reaction);
+		} else {
+			const sql = `jsonb_set("reactions", '{${exist.reaction}}', (COALESCE("reactions"->>'${exist.reaction}', '0')::int - 1)::text::jsonb)`;
+			await this.notesRepository.createQueryBuilder().update()
+				.set({
+					reactions: () => sql,
+					reactionAndUserPairCache: () => `array_remove("reactionAndUserPairCache", '${user.id}/${exist.reaction}')`,
+				})
+				.where('id = :id', { id: note.id })
+				.execute();
+		}
 
 		this.globalEventService.publishNoteStream(note.id, 'unreacted', {
 			reaction: this.decodeReaction(exist.reaction).reaction,
@@ -334,8 +338,21 @@ export class ReactionService {
 	}
 
 	/**
-	 * 文字列タイプのレガシーな形式のリアクションを現在の形式に変換しつつ、
-	 * データベース上には存在する「0個のリアクションがついている」という情報を削除する。
+	 * - 文字列タイプのレガシーな形式のリアクションを現在の形式に変換する
+	 * - ローカルのリアクションのホストを `@.` にする（`decodeReaction()`の効果）
+	 */
+	@bindThis
+	public convertLegacyReaction(reaction: string): string {
+		reaction = this.decodeReaction(reaction).reaction;
+		if (Object.keys(legacies).includes(reaction)) return legacies[reaction];
+		return reaction;
+	}
+
+	// TODO: 廃止
+	/**
+	 * - 文字列タイプのレガシーな形式のリアクションを現在の形式に変換する
+	 * - ローカルのリアクションのホストを `@.` にする（`decodeReaction()`の効果）
+	 * - データベース上には存在する「0個のリアクションがついている」という情報を削除する
 	 */
 	@bindThis
 	public convertLegacyReactions(reactions: MiNote['reactions']): MiNote['reactions'] {
@@ -348,10 +365,7 @@ export class ReactionService {
 				return count > 0;
 			})
 			.map(([reaction, count]) => {
-				// unchecked indexed access
-				const convertedReaction = legacies[reaction] as string | undefined;
-
-				const key = this.decodeReaction(convertedReaction ?? reaction).reaction;
+				const key = this.convertLegacyReaction(reaction);
 
 				return [key, count] as const;
 			})
@@ -406,11 +420,4 @@ export class ReactionService {
 			host: undefined,
 		};
 	}
-
-	@bindThis
-	public convertLegacyReaction(reaction: string): string {
-		reaction = this.decodeReaction(reaction).reaction;
-		if (Object.keys(legacies).includes(reaction)) return legacies[reaction];
-		return reaction;
-	}
 }
diff --git a/packages/backend/src/core/ReactionsBufferingService.ts b/packages/backend/src/core/ReactionsBufferingService.ts
new file mode 100644
index 0000000000..b4207c5106
--- /dev/null
+++ b/packages/backend/src/core/ReactionsBufferingService.ts
@@ -0,0 +1,211 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import * as Redis from 'ioredis';
+import { DI } from '@/di-symbols.js';
+import type { MiNote } from '@/models/Note.js';
+import { bindThis } from '@/decorators.js';
+import type { MiUser, NotesRepository } from '@/models/_.js';
+import type { Config } from '@/config.js';
+import { PER_NOTE_REACTION_USER_PAIR_CACHE_MAX } from '@/const.js';
+import type { GlobalEvents } from '@/core/GlobalEventService.js';
+import type { OnApplicationShutdown } from '@nestjs/common';
+
+const REDIS_DELTA_PREFIX = 'reactionsBufferDeltas';
+const REDIS_PAIR_PREFIX = 'reactionsBufferPairs';
+
+@Injectable()
+export class ReactionsBufferingService implements OnApplicationShutdown {
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+
+		@Inject(DI.redisForSub)
+		private redisForSub: Redis.Redis,
+
+		@Inject(DI.redisForReactions)
+		private redisForReactions: Redis.Redis, // TODO: 専用のRedisインスタンスにする
+
+		@Inject(DI.notesRepository)
+		private notesRepository: NotesRepository,
+	) {
+		this.redisForSub.on('message', this.onMessage);
+	}
+
+	@bindThis
+	private async onMessage(_: string, data: string) {
+		const obj = JSON.parse(data);
+
+		if (obj.channel === 'internal') {
+			const { type, body } = obj.message as GlobalEvents['internal']['payload'];
+			switch (type) {
+				case 'metaUpdated': {
+					// リアクションバッファリングが有効→無効になったら即bake
+					if (body.before != null && body.before.enableReactionsBuffering && !body.after.enableReactionsBuffering) {
+						this.bake();
+					}
+					break;
+				}
+				default:
+					break;
+			}
+		}
+	}
+
+	@bindThis
+	public async create(noteId: MiNote['id'], userId: MiUser['id'], reaction: string, currentPairs: string[]): Promise<void> {
+		const pipeline = this.redisForReactions.pipeline();
+		pipeline.hincrby(`${REDIS_DELTA_PREFIX}:${noteId}`, reaction, 1);
+		for (let i = 0; i < currentPairs.length; i++) {
+			pipeline.zadd(`${REDIS_PAIR_PREFIX}:${noteId}`, i, currentPairs[i]);
+		}
+		pipeline.zadd(`${REDIS_PAIR_PREFIX}:${noteId}`, Date.now(), `${userId}/${reaction}`);
+		pipeline.zremrangebyrank(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -(PER_NOTE_REACTION_USER_PAIR_CACHE_MAX + 1));
+		await pipeline.exec();
+	}
+
+	@bindThis
+	public async delete(noteId: MiNote['id'], userId: MiUser['id'], reaction: string): Promise<void> {
+		const pipeline = this.redisForReactions.pipeline();
+		pipeline.hincrby(`${REDIS_DELTA_PREFIX}:${noteId}`, reaction, -1);
+		pipeline.zrem(`${REDIS_PAIR_PREFIX}:${noteId}`, `${userId}/${reaction}`);
+		// TODO: 「消した要素一覧」も持っておかないとcreateされた時に上書きされて復活する
+		await pipeline.exec();
+	}
+
+	@bindThis
+	public async get(noteId: MiNote['id']): Promise<{
+		deltas: Record<string, number>;
+		pairs: ([MiUser['id'], string])[];
+	}> {
+		const pipeline = this.redisForReactions.pipeline();
+		pipeline.hgetall(`${REDIS_DELTA_PREFIX}:${noteId}`);
+		pipeline.zrange(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -1);
+		const results = await pipeline.exec();
+
+		const resultDeltas = results![0][1] as Record<string, string>;
+		const resultPairs = results![1][1] as string[];
+
+		const deltas = {} as Record<string, number>;
+		for (const [name, count] of Object.entries(resultDeltas)) {
+			deltas[name] = parseInt(count);
+		}
+
+		const pairs = resultPairs.map(x => x.split('/') as [MiUser['id'], string]);
+
+		return {
+			deltas,
+			pairs,
+		};
+	}
+
+	@bindThis
+	public async getMany(noteIds: MiNote['id'][]): Promise<Map<MiNote['id'], {
+		deltas: Record<string, number>;
+		pairs: ([MiUser['id'], string])[];
+	}>> {
+		const map = new Map<MiNote['id'], {
+			deltas: Record<string, number>;
+			pairs: ([MiUser['id'], string])[];
+		}>();
+
+		const pipeline = this.redisForReactions.pipeline();
+		for (const noteId of noteIds) {
+			pipeline.hgetall(`${REDIS_DELTA_PREFIX}:${noteId}`);
+			pipeline.zrange(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -1);
+		}
+		const results = await pipeline.exec();
+
+		const opsForEachNotes = 2;
+		for (let i = 0; i < noteIds.length; i++) {
+			const noteId = noteIds[i];
+			const resultDeltas = results![i * opsForEachNotes][1] as Record<string, string>;
+			const resultPairs = results![i * opsForEachNotes + 1][1] as string[];
+
+			const deltas = {} as Record<string, number>;
+			for (const [name, count] of Object.entries(resultDeltas)) {
+				deltas[name] = parseInt(count);
+			}
+
+			const pairs = resultPairs.map(x => x.split('/') as [MiUser['id'], string]);
+
+			map.set(noteId, {
+				deltas,
+				pairs,
+			});
+		}
+
+		return map;
+	}
+
+	// TODO: scanは重い可能性があるので、別途 bufferedNoteIds を直接Redis上に持っておいてもいいかもしれない
+	@bindThis
+	public async bake(): Promise<void> {
+		const bufferedNoteIds = [];
+		let cursor = '0';
+		do {
+			// https://github.com/redis/ioredis#transparent-key-prefixing
+			const result = await this.redisForReactions.scan(
+				cursor,
+				'MATCH',
+				`${this.config.redis.prefix}:${REDIS_DELTA_PREFIX}:*`,
+				'COUNT',
+				'1000');
+
+			cursor = result[0];
+			bufferedNoteIds.push(...result[1].map(x => x.replace(`${this.config.redis.prefix}:${REDIS_DELTA_PREFIX}:`, '')));
+		} while (cursor !== '0');
+
+		const bufferedMap = await this.getMany(bufferedNoteIds);
+
+		// clear
+		const pipeline = this.redisForReactions.pipeline();
+		for (const noteId of bufferedNoteIds) {
+			pipeline.del(`${REDIS_DELTA_PREFIX}:${noteId}`);
+			pipeline.del(`${REDIS_PAIR_PREFIX}:${noteId}`);
+		}
+		await pipeline.exec();
+
+		// TODO: SQL一個にまとめたい
+		for (const [noteId, buffered] of bufferedMap) {
+			const sql = Object.entries(buffered.deltas)
+				.map(([reaction, count]) =>
+					`jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + ${count})::text::jsonb)`)
+				.join(' || ');
+
+			this.notesRepository.createQueryBuilder().update()
+				.set({
+					reactions: () => sql,
+					reactionAndUserPairCache: buffered.pairs.map(x => x.join('/')),
+				})
+				.where('id = :id', { id: noteId })
+				.execute();
+		}
+	}
+
+	@bindThis
+	public mergeReactions(src: MiNote['reactions'], delta: Record<string, number>): MiNote['reactions'] {
+		const reactions = { ...src };
+		for (const [name, count] of Object.entries(delta)) {
+			if (reactions[name] != null) {
+				reactions[name] += count;
+			} else {
+				reactions[name] = count;
+			}
+		}
+		return reactions;
+	}
+
+	@bindThis
+	public dispose(): void {
+		this.redisForSub.off('message', this.onMessage);
+	}
+
+	@bindThis
+	public onApplicationShutdown(signal?: string | undefined): void {
+		this.dispose();
+	}
+}
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index 0210012a03..583eea1a34 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -8,6 +8,7 @@ import * as Redis from 'ioredis';
 import { In } from 'typeorm';
 import { ModuleRef } from '@nestjs/core';
 import type {
+	MiMeta,
 	MiRole,
 	MiRoleAssignment,
 	RoleAssignmentsRepository,
@@ -18,7 +19,6 @@ import { MemoryKVCache, MemorySingleCache } from '@/misc/cache.js';
 import type { MiUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { CacheService } from '@/core/CacheService.js';
 import type { RoleCondFormulaValue } from '@/models/Role.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
@@ -58,6 +58,11 @@ export type RolePolicies = {
 	userEachUserListsLimit: number;
 	rateLimitFactor: number;
 	avatarDecorationLimit: number;
+	canImportAntennas: boolean;
+	canImportBlocking: boolean;
+	canImportFollowing: boolean;
+	canImportMuting: boolean;
+	canImportUserLists: boolean;
 };
 
 export const DEFAULT_POLICIES: RolePolicies = {
@@ -87,6 +92,11 @@ export const DEFAULT_POLICIES: RolePolicies = {
 	userEachUserListsLimit: 50,
 	rateLimitFactor: 1,
 	avatarDecorationLimit: 1,
+	canImportAntennas: true,
+	canImportBlocking: true,
+	canImportFollowing: true,
+	canImportMuting: true,
+	canImportUserLists: true,
 };
 
 @Injectable()
@@ -101,8 +111,8 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 	constructor(
 		private moduleRef: ModuleRef,
 
-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
+		@Inject(DI.meta)
+		private meta: MiMeta,
 
 		@Inject(DI.redisForTimelines)
 		private redisForTimelines: Redis.Redis,
@@ -119,7 +129,6 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 		@Inject(DI.roleAssignmentsRepository)
 		private roleAssignmentsRepository: RoleAssignmentsRepository,
 
-		private metaService: MetaService,
 		private cacheService: CacheService,
 		private userEntityService: UserEntityService,
 		private globalEventService: GlobalEventService,
@@ -339,8 +348,7 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 
 	@bindThis
 	public async getUserPolicies(userId: MiUser['id'] | null): Promise<RolePolicies> {
-		const meta = await this.metaService.fetch();
-		const basePolicies = { ...DEFAULT_POLICIES, ...meta.policies };
+		const basePolicies = { ...DEFAULT_POLICIES, ...this.meta.policies };
 
 		if (userId == null) return basePolicies;
 
@@ -387,6 +395,11 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 			userEachUserListsLimit: calc('userEachUserListsLimit', vs => Math.max(...vs)),
 			rateLimitFactor: calc('rateLimitFactor', vs => Math.max(...vs)),
 			avatarDecorationLimit: calc('avatarDecorationLimit', vs => Math.max(...vs)),
+			canImportAntennas: calc('canImportAntennas', vs => vs.some(v => v === true)),
+			canImportBlocking: calc('canImportBlocking', vs => vs.some(v => v === true)),
+			canImportFollowing: calc('canImportFollowing', vs => vs.some(v => v === true)),
+			canImportMuting: calc('canImportMuting', vs => vs.some(v => v === true)),
+			canImportUserLists: calc('canImportUserLists', vs => vs.some(v => v === true)),
 		};
 	}
 
diff --git a/packages/backend/src/core/SignupService.ts b/packages/backend/src/core/SignupService.ts
index de45898328..cc8a3d6461 100644
--- a/packages/backend/src/core/SignupService.ts
+++ b/packages/backend/src/core/SignupService.ts
@@ -8,7 +8,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import bcrypt from 'bcryptjs';
 import { DataSource, IsNull } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
 import { MiUser } from '@/models/User.js';
 import { MiUserProfile } from '@/models/UserProfile.js';
 import { IdService } from '@/core/IdService.js';
@@ -20,7 +20,6 @@ import { InstanceActorService } from '@/core/InstanceActorService.js';
 import { bindThis } from '@/decorators.js';
 import UsersChart from '@/core/chart/charts/users.js';
 import { UtilityService } from '@/core/UtilityService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { UserService } from '@/core/UserService.js';
 
 @Injectable()
@@ -29,6 +28,9 @@ export class SignupService {
 		@Inject(DI.db)
 		private db: DataSource,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -39,7 +41,6 @@ export class SignupService {
 		private userService: UserService,
 		private userEntityService: UserEntityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private instanceActorService: InstanceActorService,
 		private usersChart: UsersChart,
 	) {
@@ -88,8 +89,7 @@ export class SignupService {
 		const isTheFirstUser = !await this.instanceActorService.realLocalUsersPresent();
 
 		if (!opts.ignorePreservedUsernames && !isTheFirstUser) {
-			const instance = await this.metaService.fetch(true);
-			const isPreserved = instance.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
+			const isPreserved = this.meta.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
 			if (isPreserved) {
 				throw new Error('USED_USERNAME');
 			}
diff --git a/packages/backend/src/core/SystemWebhookService.ts b/packages/backend/src/core/SystemWebhookService.ts
index bc6851f788..bb7c6b8c0e 100644
--- a/packages/backend/src/core/SystemWebhookService.ts
+++ b/packages/backend/src/core/SystemWebhookService.ts
@@ -54,7 +54,7 @@ export class SystemWebhookService implements OnApplicationShutdown {
 	 * SystemWebhook の一覧を取得する.
 	 */
 	@bindThis
-	public async fetchSystemWebhooks(params?: {
+	public fetchSystemWebhooks(params?: {
 		ids?: MiSystemWebhook['id'][];
 		isActive?: MiSystemWebhook['isActive'];
 		on?: MiSystemWebhook['on'];
@@ -165,19 +165,24 @@ export class SystemWebhookService implements OnApplicationShutdown {
 	/**
 	 * SystemWebhook をWebhook配送キューに追加する
 	 * @see QueueService.systemWebhookDeliver
+	 * // TODO: contentの型を厳格化する
 	 */
 	@bindThis
-	public async enqueueSystemWebhook(webhook: MiSystemWebhook | MiSystemWebhook['id'], type: SystemWebhookEventType, content: unknown) {
+	public async enqueueSystemWebhook<T extends SystemWebhookEventType>(
+		webhook: MiSystemWebhook | MiSystemWebhook['id'],
+		type: T,
+		content: unknown,
+	) {
 		const webhookEntity = typeof webhook === 'string'
 			? (await this.fetchActiveSystemWebhooks()).find(a => a.id === webhook)
 			: webhook;
 		if (!webhookEntity || !webhookEntity.isActive) {
-			this.logger.info(`Webhook is not active or not found : ${webhook}`);
+			this.logger.info(`SystemWebhook is not active or not found : ${webhook}`);
 			return;
 		}
 
 		if (!webhookEntity.on.includes(type)) {
-			this.logger.info(`Webhook ${webhookEntity.id} is not listening to ${type}`);
+			this.logger.info(`SystemWebhook ${webhookEntity.id} is not listening to ${type}`);
 			return;
 		}
 
diff --git a/packages/backend/src/core/UserFollowingService.ts b/packages/backend/src/core/UserFollowingService.ts
index 6aab8fde70..77e7b60bea 100644
--- a/packages/backend/src/core/UserFollowingService.ts
+++ b/packages/backend/src/core/UserFollowingService.ts
@@ -13,23 +13,20 @@ import PerUserFollowingChart from '@/core/chart/charts/per-user-following.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { IdService } from '@/core/IdService.js';
 import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
-import type { Packed } from '@/misc/json-schema.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { UserWebhookService } from '@/core/UserWebhookService.js';
 import { NotificationService } from '@/core/NotificationService.js';
 import { DI } from '@/di-symbols.js';
-import type { FollowingsRepository, FollowRequestsRepository, InstancesRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type { FollowingsRepository, FollowRequestsRepository, InstancesRepository, MiMeta, UserProfilesRepository, UsersRepository } from '@/models/_.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { bindThis } from '@/decorators.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { CacheService } from '@/core/CacheService.js';
 import type { Config } from '@/config.js';
 import { AccountMoveService } from '@/core/AccountMoveService.js';
 import { UtilityService } from '@/core/UtilityService.js';
-import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
 import type { ThinUser } from '@/queue/types.js';
 import Logger from '../logger.js';
 
@@ -58,6 +55,9 @@ export class UserFollowingService implements OnModuleInit {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -79,13 +79,11 @@ export class UserFollowingService implements OnModuleInit {
 		private idService: IdService,
 		private queueService: QueueService,
 		private globalEventService: GlobalEventService,
-		private metaService: MetaService,
 		private notificationService: NotificationService,
 		private federatedInstanceService: FederatedInstanceService,
 		private webhookService: UserWebhookService,
 		private apRendererService: ApRendererService,
 		private accountMoveService: AccountMoveService,
-		private fanoutTimelineService: FanoutTimelineService,
 		private perUserFollowingChart: PerUserFollowingChart,
 		private instanceChart: InstanceChart,
 	) {
@@ -172,7 +170,7 @@ export class UserFollowingService implements OnModuleInit {
 			followee.isLocked ||
 			(followeeProfile.carefulBot && follower.isBot) ||
 			(this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee) && process.env.FORCE_FOLLOW_REMOTE_USER_FOR_TESTING !== 'true') ||
-			(this.userEntityService.isLocalUser(followee) && this.userEntityService.isRemoteUser(follower) && this.utilityService.isSilencedHost((await this.metaService.fetch()).silencedHosts, follower.host))
+			(this.userEntityService.isLocalUser(followee) && this.userEntityService.isRemoteUser(follower) && this.utilityService.isSilencedHost(this.meta.silencedHosts, follower.host))
 		) {
 			let autoAccept = false;
 
@@ -277,16 +275,19 @@ export class UserFollowingService implements OnModuleInit {
 				followeeId: followee.id,
 				followerId: follower.id,
 			});
-
-			// 通知を作成
-			if (follower.host === null) {
-				this.notificationService.createNotification(follower.id, 'followRequestAccepted', {
-				}, followee.id);
-			}
 		}
 
 		if (alreadyFollowed) return;
 
+		// 通知を作成
+		if (follower.host === null) {
+			const profile = await this.cacheService.userProfileCache.fetch(followee.id);
+
+			this.notificationService.createNotification(follower.id, 'followRequestAccepted', {
+				message: profile.followedMessage,
+			}, followee.id);
+		}
+
 		this.globalEventService.publishInternalEvent('follow', { followerId: follower.id, followeeId: followee.id });
 
 		const [followeeUser, followerUser] = await Promise.all([
@@ -307,14 +308,14 @@ export class UserFollowingService implements OnModuleInit {
 			if (this.userEntityService.isRemoteUser(follower) && this.userEntityService.isLocalUser(followee)) {
 				this.federatedInstanceService.fetch(follower.host).then(async i => {
 					this.instancesRepository.increment({ id: i.id }, 'followingCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowing(i.host, true);
 					}
 				});
 			} else if (this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee)) {
 				this.federatedInstanceService.fetch(followee.host).then(async i => {
 					this.instancesRepository.increment({ id: i.id }, 'followersCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowers(i.host, true);
 					}
 				});
@@ -439,14 +440,14 @@ export class UserFollowingService implements OnModuleInit {
 			if (this.userEntityService.isRemoteUser(follower) && this.userEntityService.isLocalUser(followee)) {
 				this.federatedInstanceService.fetch(follower.host).then(async i => {
 					this.instancesRepository.decrement({ id: i.id }, 'followingCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowing(i.host, false);
 					}
 				});
 			} else if (this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee)) {
 				this.federatedInstanceService.fetch(followee.host).then(async i => {
 					this.instancesRepository.decrement({ id: i.id }, 'followersCount', 1);
-					if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+					if (this.meta.enableChartsForFederatedInstances) {
 						this.instanceChart.updateFollowers(i.host, false);
 					}
 				});
diff --git a/packages/backend/src/core/UserWebhookService.ts b/packages/backend/src/core/UserWebhookService.ts
index e96bfeea95..8a40a53688 100644
--- a/packages/backend/src/core/UserWebhookService.ts
+++ b/packages/backend/src/core/UserWebhookService.ts
@@ -5,8 +5,8 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import * as Redis from 'ioredis';
-import type { WebhooksRepository } from '@/models/_.js';
-import type { MiWebhook } from '@/models/Webhook.js';
+import { type WebhooksRepository } from '@/models/_.js';
+import { MiWebhook } from '@/models/Webhook.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
 import { GlobalEvents } from '@/core/GlobalEventService.js';
@@ -38,6 +38,31 @@ export class UserWebhookService implements OnApplicationShutdown {
 		return this.activeWebhooks;
 	}
 
+	/**
+	 * UserWebhook の一覧を取得する.
+	 */
+	@bindThis
+	public fetchWebhooks(params?: {
+		ids?: MiWebhook['id'][];
+		isActive?: MiWebhook['active'];
+		on?: MiWebhook['on'];
+	}): Promise<MiWebhook[]> {
+		const query = this.webhooksRepository.createQueryBuilder('webhook');
+		if (params) {
+			if (params.ids && params.ids.length > 0) {
+				query.andWhere('webhook.id IN (:...ids)', { ids: params.ids });
+			}
+			if (params.isActive !== undefined) {
+				query.andWhere('webhook.active = :isActive', { isActive: params.isActive });
+			}
+			if (params.on && params.on.length > 0) {
+				query.andWhere(':on <@ webhook.on', { on: params.on });
+			}
+		}
+
+		return query.getMany();
+	}
+
 	@bindThis
 	private async onMessage(_: string, data: string): Promise<void> {
 		const obj = JSON.parse(data);
diff --git a/packages/backend/src/core/UtilityService.ts b/packages/backend/src/core/UtilityService.ts
index 94729250a6..86082ccdcd 100644
--- a/packages/backend/src/core/UtilityService.ts
+++ b/packages/backend/src/core/UtilityService.ts
@@ -10,12 +10,16 @@ import RE2 from 're2';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { bindThis } from '@/decorators.js';
+import { MiMeta } from '@/models/Meta.js';
 
 @Injectable()
 export class UtilityService {
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
+
+		@Inject(DI.meta)
+		private meta: MiMeta,
 	) {
 	}
 
@@ -105,4 +109,19 @@ export class UtilityService {
 		if (host == null) return null;
 		return toASCII(host.toLowerCase());
 	}
+
+	@bindThis
+	public isFederationAllowedHost(host: string): boolean {
+		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;
+
+		return true;
+	}
+
+	@bindThis
+	public isFederationAllowedUri(uri: string): boolean {
+		const host = this.extractDbHost(uri);
+		return this.isFederationAllowedHost(host);
+	}
 }
diff --git a/packages/backend/src/core/WebAuthnService.ts b/packages/backend/src/core/WebAuthnService.ts
index ec9f4484a4..75ab0a207c 100644
--- a/packages/backend/src/core/WebAuthnService.ts
+++ b/packages/backend/src/core/WebAuthnService.ts
@@ -12,10 +12,9 @@ import {
 } from '@simplewebauthn/server';
 import { AttestationFormat, isoCBOR, isoUint8Array } from '@simplewebauthn/server/helpers';
 import { DI } from '@/di-symbols.js';
-import type { UserSecurityKeysRepository } from '@/models/_.js';
+import type { MiMeta, UserSecurityKeysRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiUser } from '@/models/_.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import type {
@@ -23,7 +22,6 @@ import type {
 	AuthenticatorTransportFuture,
 	CredentialDeviceType,
 	PublicKeyCredentialCreationOptionsJSON,
-	PublicKeyCredentialDescriptorFuture,
 	PublicKeyCredentialRequestOptionsJSON,
 	RegistrationResponseJSON,
 } from '@simplewebauthn/types';
@@ -31,33 +29,33 @@ import type {
 @Injectable()
 export class WebAuthnService {
 	constructor(
-		@Inject(DI.redis)
-		private redisClient: Redis.Redis,
-
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+
 		@Inject(DI.userSecurityKeysRepository)
 		private userSecurityKeysRepository: UserSecurityKeysRepository,
-
-		private metaService: MetaService,
 	) {
 	}
 
 	@bindThis
-	public async getRelyingParty(): Promise<{ origin: string; rpId: string; rpName: string; rpIcon?: string; }> {
-		const instance = await this.metaService.fetch();
+	public getRelyingParty(): { origin: string; rpId: string; rpName: string; rpIcon?: string; } {
 		return {
 			origin: this.config.url,
 			rpId: this.config.hostname,
-			rpName: instance.name ?? this.config.host,
-			rpIcon: instance.iconUrl ?? undefined,
+			rpName: this.meta.name ?? this.config.host,
+			rpIcon: this.meta.iconUrl ?? undefined,
 		};
 	}
 
 	@bindThis
 	public async initiateRegistration(userId: MiUser['id'], userName: string, userDisplayName?: string): Promise<PublicKeyCredentialCreationOptionsJSON> {
-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();
 		const keys = await this.userSecurityKeysRepository.findBy({
 			userId: userId,
 		});
@@ -104,7 +102,7 @@ export class WebAuthnService {
 
 		await this.redisClient.del(`webauthn:challenge:${userId}`);
 
-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();
 
 		let verification;
 		try {
@@ -143,7 +141,7 @@ export class WebAuthnService {
 
 	@bindThis
 	public async initiateAuthentication(userId: MiUser['id']): Promise<PublicKeyCredentialRequestOptionsJSON> {
-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();
 		const keys = await this.userSecurityKeysRepository.findBy({
 			userId: userId,
 		});
@@ -166,6 +164,86 @@ export class WebAuthnService {
 		return authenticationOptions;
 	}
 
+	/**
+	 * Initiate Passkey Auth (Without specifying user)
+	 * @returns authenticationOptions
+	 */
+	@bindThis
+	public async initiateSignInWithPasskeyAuthentication(context: string): Promise<PublicKeyCredentialRequestOptionsJSON> {
+		const relyingParty = await this.getRelyingParty();
+
+		const authenticationOptions = await generateAuthenticationOptions({
+			rpID: relyingParty.rpId,
+			userVerification: 'preferred',
+		});
+
+		await this.redisClient.setex(`webauthn:challenge:${context}`, 90, authenticationOptions.challenge);
+
+		return authenticationOptions;
+	}
+
+	/**
+	 * Verify Webauthn AuthenticationCredential
+	 * @throws IdentifiableError
+	 * @returns If the challenge is successful, return the user ID. Otherwise, return null.
+	 */
+	@bindThis
+	public async verifySignInWithPasskeyAuthentication(context: string, response: AuthenticationResponseJSON): Promise<MiUser['id'] | null> {
+		const challenge = await this.redisClient.get(`webauthn:challenge:${context}`);
+
+		if (!challenge) {
+			throw new IdentifiableError('2d16e51c-007b-4edd-afd2-f7dd02c947f6', `challenge '${context}' not found`);
+		}
+
+		await this.redisClient.del(`webauthn:challenge:${context}`);
+
+		const key = await this.userSecurityKeysRepository.findOneBy({
+			id: response.id,
+		});
+
+		if (!key) {
+			throw new IdentifiableError('36b96a7d-b547-412d-aeed-2d611cdc8cdc', 'Unknown Webauthn key');
+		}
+
+		const relyingParty = await this.getRelyingParty();
+
+		let verification;
+		try {
+			verification = await verifyAuthenticationResponse({
+				response: response,
+				expectedChallenge: challenge,
+				expectedOrigin: relyingParty.origin,
+				expectedRPID: relyingParty.rpId,
+				authenticator: {
+					credentialID: key.id,
+					credentialPublicKey: Buffer.from(key.publicKey, 'base64url'),
+					counter: key.counter,
+					transports: key.transports ? key.transports as AuthenticatorTransportFuture[] : undefined,
+				},
+				requireUserVerification: true,
+			});
+		} catch (error) {
+			throw new IdentifiableError('b18c89a7-5b5e-4cec-bb5b-0419f332d430', `verification failed: ${error}`);
+		}
+
+		const { verified, authenticationInfo } = verification;
+
+		if (!verified) {
+			return null;
+		}
+
+		await this.userSecurityKeysRepository.update({
+			id: response.id,
+		}, {
+			lastUsed: new Date(),
+			counter: authenticationInfo.newCounter,
+			credentialDeviceType: authenticationInfo.credentialDeviceType,
+			credentialBackedUp: authenticationInfo.credentialBackedUp,
+		});
+
+		return key.userId;
+	}
+
 	@bindThis
 	public async verifyAuthentication(userId: MiUser['id'], response: AuthenticationResponseJSON): Promise<boolean> {
 		const challenge = await this.redisClient.get(`webauthn:challenge:${userId}`);
@@ -209,7 +287,7 @@ export class WebAuthnService {
 			}
 		}
 
-		const relyingParty = await this.getRelyingParty();
+		const relyingParty = this.getRelyingParty();
 
 		let verification;
 		try {
diff --git a/packages/backend/src/core/WebhookTestService.ts b/packages/backend/src/core/WebhookTestService.ts
new file mode 100644
index 0000000000..c2764f30e8
--- /dev/null
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -0,0 +1,435 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Injectable } from '@nestjs/common';
+import { MiAbuseUserReport, MiNote, MiUser, MiWebhook } from '@/models/_.js';
+import { bindThis } from '@/decorators.js';
+import { MiSystemWebhook, type SystemWebhookEventType } from '@/models/SystemWebhook.js';
+import { SystemWebhookService } from '@/core/SystemWebhookService.js';
+import { Packed } from '@/misc/json-schema.js';
+import { type WebhookEventTypes } from '@/models/Webhook.js';
+import { UserWebhookService } from '@/core/UserWebhookService.js';
+import { QueueService } from '@/core/QueueService.js';
+
+const oneDayMillis = 24 * 60 * 60 * 1000;
+
+function generateAbuseReport(override?: Partial<MiAbuseUserReport>): MiAbuseUserReport {
+	return {
+		id: 'dummy-abuse-report1',
+		targetUserId: 'dummy-target-user',
+		targetUser: null,
+		reporterId: 'dummy-reporter-user',
+		reporter: null,
+		assigneeId: null,
+		assignee: null,
+		resolved: false,
+		forwarded: false,
+		comment: 'This is a dummy report for testing purposes.',
+		targetUserHost: null,
+		reporterHost: null,
+		...override,
+	};
+}
+
+function generateDummyUser(override?: Partial<MiUser>): MiUser {
+	return {
+		id: 'dummy-user-1',
+		updatedAt: new Date(Date.now() - oneDayMillis * 7),
+		lastFetchedAt: new Date(Date.now() - oneDayMillis * 5),
+		lastActiveDate: new Date(Date.now() - oneDayMillis * 3),
+		hideOnlineStatus: false,
+		username: 'dummy1',
+		usernameLower: 'dummy1',
+		name: 'DummyUser1',
+		followersCount: 10,
+		followingCount: 5,
+		movedToUri: null,
+		movedAt: null,
+		alsoKnownAs: null,
+		notesCount: 30,
+		avatarId: null,
+		avatar: null,
+		bannerId: null,
+		banner: null,
+		avatarUrl: null,
+		bannerUrl: null,
+		avatarBlurhash: null,
+		bannerBlurhash: null,
+		avatarDecorations: [],
+		tags: [],
+		isSuspended: false,
+		isLocked: false,
+		isBot: false,
+		isCat: true,
+		isRoot: false,
+		isExplorable: true,
+		isHibernated: false,
+		isDeleted: false,
+		emojis: [],
+		score: 0,
+		host: null,
+		inbox: null,
+		sharedInbox: null,
+		featured: null,
+		uri: null,
+		followersUri: null,
+		token: null,
+		...override,
+	};
+}
+
+function generateDummyNote(override?: Partial<MiNote>): MiNote {
+	return {
+		id: 'dummy-note-1',
+		replyId: null,
+		reply: null,
+		renoteId: null,
+		renote: null,
+		threadId: null,
+		text: 'This is a dummy note for testing purposes.',
+		name: null,
+		cw: null,
+		userId: 'dummy-user-1',
+		user: null,
+		localOnly: true,
+		reactionAcceptance: 'likeOnly',
+		renoteCount: 10,
+		repliesCount: 5,
+		clippedCount: 0,
+		reactions: {},
+		visibility: 'public',
+		uri: null,
+		url: null,
+		fileIds: [],
+		attachedFileTypes: [],
+		visibleUserIds: [],
+		mentions: [],
+		mentionedRemoteUsers: '[]',
+		reactionAndUserPairCache: [],
+		emojis: [],
+		tags: [],
+		hasPoll: false,
+		channelId: null,
+		channel: null,
+		userHost: null,
+		replyUserId: null,
+		replyUserHost: null,
+		renoteUserId: null,
+		renoteUserHost: null,
+		...override,
+	};
+}
+
+function toPackedNote(note: MiNote, detail = true, override?: Packed<'Note'>): Packed<'Note'> {
+	return {
+		id: note.id,
+		createdAt: new Date().toISOString(),
+		deletedAt: null,
+		text: note.text,
+		cw: note.cw,
+		userId: note.userId,
+		user: toPackedUserLite(note.user ?? generateDummyUser()),
+		replyId: note.replyId,
+		renoteId: note.renoteId,
+		isHidden: false,
+		visibility: note.visibility,
+		mentions: note.mentions,
+		visibleUserIds: note.visibleUserIds,
+		fileIds: note.fileIds,
+		files: [],
+		tags: note.tags,
+		poll: null,
+		emojis: note.emojis,
+		channelId: note.channelId,
+		channel: note.channel,
+		localOnly: note.localOnly,
+		reactionAcceptance: note.reactionAcceptance,
+		reactionEmojis: {},
+		reactions: {},
+		reactionCount: 0,
+		renoteCount: note.renoteCount,
+		repliesCount: note.repliesCount,
+		uri: note.uri ?? undefined,
+		url: note.url ?? undefined,
+		reactionAndUserPairCache: note.reactionAndUserPairCache,
+		...(detail ? {
+			clippedCount: note.clippedCount,
+			reply: note.reply ? toPackedNote(note.reply, false) : null,
+			renote: note.renote ? toPackedNote(note.renote, true) : null,
+			myReaction: null,
+		} : {}),
+		...override,
+	};
+}
+
+function toPackedUserLite(user: MiUser, override?: Packed<'UserLite'>): Packed<'UserLite'> {
+	return {
+		id: user.id,
+		name: user.name,
+		username: user.username,
+		host: user.host,
+		avatarUrl: user.avatarUrl,
+		avatarBlurhash: user.avatarBlurhash,
+		avatarDecorations: user.avatarDecorations.map(it => ({
+			id: it.id,
+			angle: it.angle,
+			flipH: it.flipH,
+			url: 'https://example.com/dummy-image001.png',
+			offsetX: it.offsetX,
+			offsetY: it.offsetY,
+		})),
+		isBot: user.isBot,
+		isCat: user.isCat,
+		emojis: user.emojis,
+		onlineStatus: 'active',
+		badgeRoles: [],
+		...override,
+	};
+}
+
+function toPackedUserDetailedNotMe(user: MiUser, override?: Packed<'UserDetailedNotMe'>): Packed<'UserDetailedNotMe'> {
+	return {
+		...toPackedUserLite(user),
+		url: null,
+		uri: null,
+		movedTo: null,
+		alsoKnownAs: [],
+		createdAt: new Date().toISOString(),
+		updatedAt: user.updatedAt?.toISOString() ?? null,
+		lastFetchedAt: user.lastFetchedAt?.toISOString() ?? null,
+		bannerUrl: user.bannerUrl,
+		bannerBlurhash: user.bannerBlurhash,
+		isLocked: user.isLocked,
+		isSilenced: false,
+		isSuspended: user.isSuspended,
+		description: null,
+		location: null,
+		birthday: null,
+		lang: null,
+		fields: [],
+		verifiedLinks: [],
+		followersCount: user.followersCount,
+		followingCount: user.followingCount,
+		notesCount: user.notesCount,
+		pinnedNoteIds: [],
+		pinnedNotes: [],
+		pinnedPageId: null,
+		pinnedPage: null,
+		publicReactions: true,
+		followersVisibility: 'public',
+		followingVisibility: 'public',
+		twoFactorEnabled: false,
+		usePasswordLessLogin: false,
+		securityKeys: false,
+		roles: [],
+		memo: null,
+		moderationNote: undefined,
+		isFollowing: false,
+		isFollowed: false,
+		hasPendingFollowRequestFromYou: false,
+		hasPendingFollowRequestToYou: false,
+		isBlocking: false,
+		isBlocked: false,
+		isMuted: false,
+		isRenoteMuted: false,
+		notify: 'none',
+		withReplies: true,
+		...override,
+	};
+}
+
+const dummyUser1 = generateDummyUser();
+const dummyUser2 = generateDummyUser({
+	id: 'dummy-user-2',
+	updatedAt: new Date(Date.now() - oneDayMillis * 30),
+	lastFetchedAt: new Date(Date.now() - oneDayMillis),
+	lastActiveDate: new Date(Date.now() - oneDayMillis),
+	username: 'dummy2',
+	usernameLower: 'dummy2',
+	name: 'DummyUser2',
+	followersCount: 40,
+	followingCount: 50,
+	notesCount: 900,
+});
+const dummyUser3 = generateDummyUser({
+	id: 'dummy-user-3',
+	updatedAt: new Date(Date.now() - oneDayMillis * 15),
+	lastFetchedAt: new Date(Date.now() - oneDayMillis * 2),
+	lastActiveDate: new Date(Date.now() - oneDayMillis * 2),
+	username: 'dummy3',
+	usernameLower: 'dummy3',
+	name: 'DummyUser3',
+	followersCount: 60,
+	followingCount: 70,
+	notesCount: 15900,
+});
+
+@Injectable()
+export class WebhookTestService {
+	public static NoSuchWebhookError = class extends Error {};
+
+	constructor(
+		private userWebhookService: UserWebhookService,
+		private systemWebhookService: SystemWebhookService,
+		private queueService: QueueService,
+	) {
+	}
+
+	/**
+	 * UserWebhookのテスト送信を行う.
+	 * 送信されるペイロードはいずれもダミーの値で、実際にはデータベース上に存在しない.
+	 *
+	 * また、この関数経由で送信されるWebhookは以下の設定を無視する.
+	 * - Webhookそのものの有効・無効設定（active）
+	 * - 送信対象イベント（on）に関する設定
+	 */
+	@bindThis
+	public async testUserWebhook(
+		params: {
+			webhookId: MiWebhook['id'],
+			type: WebhookEventTypes,
+			override?: Partial<Omit<MiWebhook, 'id'>>,
+		},
+		sender: MiUser | null,
+	) {
+		const webhooks = await this.userWebhookService.fetchWebhooks({ ids: [params.webhookId] })
+			.then(it => it.filter(it => it.userId === sender?.id));
+		if (webhooks.length === 0) {
+			throw new WebhookTestService.NoSuchWebhookError();
+		}
+
+		const webhook = webhooks[0];
+		const send = (contents: unknown) => {
+			const merged = {
+				...webhook,
+				...params.override,
+			};
+
+			// テスト目的なのでUserWebhookServiceの機能を経由せず直接キューに追加する（チェック処理などをスキップする意図）.
+			// また、Jobの試行回数も1回だけ.
+			this.queueService.userWebhookDeliver(merged, params.type, contents, { attempts: 1 });
+		};
+
+		const dummyNote1 = generateDummyNote({
+			userId: dummyUser1.id,
+			user: dummyUser1,
+		});
+		const dummyReply1 = generateDummyNote({
+			id: 'dummy-reply-1',
+			replyId: dummyNote1.id,
+			reply: dummyNote1,
+			userId: dummyUser1.id,
+			user: dummyUser1,
+		});
+		const dummyRenote1 = generateDummyNote({
+			id: 'dummy-renote-1',
+			renoteId: dummyNote1.id,
+			renote: dummyNote1,
+			userId: dummyUser2.id,
+			user: dummyUser2,
+			text: null,
+		});
+		const dummyMention1 = generateDummyNote({
+			id: 'dummy-mention-1',
+			userId: dummyUser1.id,
+			user: dummyUser1,
+			text: `@${dummyUser2.username} This is a mention to you.`,
+			mentions: [dummyUser2.id],
+		});
+
+		switch (params.type) {
+			case 'note': {
+				send(toPackedNote(dummyNote1));
+				break;
+			}
+			case 'reply': {
+				send(toPackedNote(dummyReply1));
+				break;
+			}
+			case 'renote': {
+				send(toPackedNote(dummyRenote1));
+				break;
+			}
+			case 'mention': {
+				send(toPackedNote(dummyMention1));
+				break;
+			}
+			case 'follow': {
+				send(toPackedUserDetailedNotMe(dummyUser1));
+				break;
+			}
+			case 'followed': {
+				send(toPackedUserLite(dummyUser2));
+				break;
+			}
+			case 'unfollow': {
+				send(toPackedUserDetailedNotMe(dummyUser3));
+				break;
+			}
+		}
+	}
+
+	/**
+	 * SystemWebhookのテスト送信を行う.
+	 * 送信されるペイロードはいずれもダミーの値で、実際にはデータベース上に存在しない.
+	 *
+	 * また、この関数経由で送信されるWebhookは以下の設定を無視する.
+	 * - Webhookそのものの有効・無効設定（isActive）
+	 * - 送信対象イベント（on）に関する設定
+	 */
+	@bindThis
+	public async testSystemWebhook(
+		params: {
+			webhookId: MiSystemWebhook['id'],
+			type: SystemWebhookEventType,
+			override?: Partial<Omit<MiSystemWebhook, 'id'>>,
+		},
+	) {
+		const webhooks = await this.systemWebhookService.fetchSystemWebhooks({ ids: [params.webhookId] });
+		if (webhooks.length === 0) {
+			throw new WebhookTestService.NoSuchWebhookError();
+		}
+
+		const webhook = webhooks[0];
+		const send = (contents: unknown) => {
+			const merged = {
+				...webhook,
+				...params.override,
+			};
+
+			// テスト目的なのでSystemWebhookServiceの機能を経由せず直接キューに追加する（チェック処理などをスキップする意図）.
+			// また、Jobの試行回数も1回だけ.
+			this.queueService.systemWebhookDeliver(merged, params.type, contents, { attempts: 1 });
+		};
+
+		switch (params.type) {
+			case 'abuseReport': {
+				send(generateAbuseReport({
+					targetUserId: dummyUser1.id,
+					targetUser: dummyUser1,
+					reporterId: dummyUser2.id,
+					reporter: dummyUser2,
+				}));
+				break;
+			}
+			case 'abuseReportResolved': {
+				send(generateAbuseReport({
+					targetUserId: dummyUser1.id,
+					targetUser: dummyUser1,
+					reporterId: dummyUser2.id,
+					reporter: dummyUser2,
+					assigneeId: dummyUser3.id,
+					assignee: dummyUser3,
+					resolved: true,
+				}));
+				break;
+			}
+			case 'userCreated': {
+				send(toPackedUserLite(dummyUser1));
+				break;
+			}
+		}
+	}
+}
diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index e2164fec1d..376c9c0151 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -17,14 +17,13 @@ import { NoteCreateService } from '@/core/NoteCreateService.js';
 import { concat, toArray, toSingle, unique } from '@/misc/prelude/array.js';
 import { AppLockService } from '@/core/AppLockService.js';
 import type Logger from '@/logger.js';
-import { MetaService } from '@/core/MetaService.js';
 import { IdService } from '@/core/IdService.js';
 import { StatusError } from '@/misc/status-error.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { QueueService } from '@/core/QueueService.js';
-import type { UsersRepository, NotesRepository, FollowingsRepository, AbuseUserReportsRepository, FollowRequestsRepository } from '@/models/_.js';
+import type { UsersRepository, NotesRepository, FollowingsRepository, AbuseUserReportsRepository, FollowRequestsRepository, MiMeta } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
@@ -48,6 +47,9 @@ export class ApInboxService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -64,7 +66,6 @@ export class ApInboxService {
 		private noteEntityService: NoteEntityService,
 		private utilityService: UtilityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private abuseReportService: AbuseReportService,
 		private userFollowingService: UserFollowingService,
 		private apAudienceService: ApAudienceService,
@@ -289,9 +290,8 @@ export class ApInboxService {
 			return;
 		}
 
-		// アナウンス先をブロックしてたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, this.utilityService.extractDbHost(uri))) return;
+		// 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);
 
diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 98e944f347..fba8947f03 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -494,6 +494,7 @@ export class ApRendererService {
 			name: user.name,
 			summary: profile.description ? this.mfmService.toHtml(mfm.parse(profile.description)) : null,
 			_misskey_summary: profile.description,
+			_misskey_followedMessage: profile.followedMessage,
 			icon: avatar ? this.renderImage(avatar) : null,
 			image: banner ? this.renderImage(banner) : null,
 			tag,
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index 7cf8359212..c7d19adfd5 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -205,18 +205,47 @@ export class ApRequestService {
 		//#region リクエスト先がhtmlかつactivity+jsonへのalternate linkタグがあるとき
 		const contentType = res.headers.get('content-type');
 
-		if ((contentType ?? '').split(';')[0].trimEnd().toLowerCase() === 'text/html' && _followAlternate === true) {
+		if (
+			res.ok &&
+			(contentType ?? '').split(';')[0].trimEnd().toLowerCase() === 'text/html' &&
+			_followAlternate === true
+		) {
 			const html = await res.text();
-			const window = new Window();
+			const { window, happyDOM } = new Window({
+				settings: {
+					disableJavaScriptEvaluation: true,
+					disableJavaScriptFileLoading: true,
+					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;
-			document.documentElement.innerHTML = html;
+			try {
+				document.documentElement.innerHTML = html;
 
-			const alternate = document.querySelector('head > link[rel="alternate"][type="application/activity+json"]');
-			if (alternate) {
-				const href = alternate.getAttribute('href');
-				if (href) {
-					return await this.signedGet(href, user, false);
+				const alternate = document.querySelector('head > link[rel="alternate"][type="application/activity+json"]');
+				if (alternate) {
+					const href = alternate.getAttribute('href');
+					if (href) {
+						return await this.signedGet(href, user, false);
+					}
 				}
+			} catch (e) {
+				// something went wrong parsing the HTML, ignore the whole thing
+			} finally {
+				happyDOM.close().catch(err => {});
 			}
 		}
 		//#endregion
diff --git a/packages/backend/src/core/activitypub/ApResolverService.ts b/packages/backend/src/core/activitypub/ApResolverService.ts
index bb3c40f093..ca35608d9b 100644
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@@ -7,9 +7,8 @@ import { Inject, Injectable } from '@nestjs/common';
 import { IsNull, Not } from 'typeorm';
 import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import { InstanceActorService } from '@/core/InstanceActorService.js';
-import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository } from '@/models/_.js';
+import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository, FollowRequestsRepository, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { DI } from '@/di-symbols.js';
 import { UtilityService } from '@/core/UtilityService.js';
@@ -29,6 +28,7 @@ export class Resolver {
 
 	constructor(
 		private config: Config,
+		private meta: MiMeta,
 		private usersRepository: UsersRepository,
 		private notesRepository: NotesRepository,
 		private pollsRepository: PollsRepository,
@@ -36,7 +36,6 @@ export class Resolver {
 		private followRequestsRepository: FollowRequestsRepository,
 		private utilityService: UtilityService,
 		private instanceActorService: InstanceActorService,
-		private metaService: MetaService,
 		private apRequestService: ApRequestService,
 		private httpRequestService: HttpRequestService,
 		private apRendererService: ApRendererService,
@@ -94,8 +93,7 @@ export class Resolver {
 			return await this.resolveLocal(value);
 		}
 
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, host)) {
+		if (!this.utilityService.isFederationAllowedHost(host)) {
 			throw new Error('Instance is blocked');
 		}
 
@@ -178,6 +176,9 @@ export class ApResolverService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -195,7 +196,6 @@ export class ApResolverService {
 
 		private utilityService: UtilityService,
 		private instanceActorService: InstanceActorService,
-		private metaService: MetaService,
 		private apRequestService: ApRequestService,
 		private httpRequestService: HttpRequestService,
 		private apRendererService: ApRendererService,
@@ -208,6 +208,7 @@ export class ApResolverService {
 	public createResolver(): Resolver {
 		return new Resolver(
 			this.config,
+			this.meta,
 			this.usersRepository,
 			this.notesRepository,
 			this.pollsRepository,
@@ -215,7 +216,6 @@ export class ApResolverService {
 			this.followRequestsRepository,
 			this.utilityService,
 			this.instanceActorService,
-			this.metaService,
 			this.apRequestService,
 			this.httpRequestService,
 			this.apRendererService,
diff --git a/packages/backend/src/core/activitypub/misc/contexts.ts b/packages/backend/src/core/activitypub/misc/contexts.ts
index feb8c42c56..3dd85b9b86 100644
--- a/packages/backend/src/core/activitypub/misc/contexts.ts
+++ b/packages/backend/src/core/activitypub/misc/contexts.ts
@@ -554,6 +554,7 @@ const extension_context_definition = {
 	'_misskey_reaction': 'misskey:_misskey_reaction',
 	'_misskey_votes': 'misskey:_misskey_votes',
 	'_misskey_summary': 'misskey:_misskey_summary',
+	'_misskey_followedMessage': 'misskey:_misskey_followedMessage',
 	'isCat': 'misskey:isCat',
 	// vcard
 	vcard: 'http://www.w3.org/2006/vcard/ns#',
diff --git a/packages/backend/src/core/activitypub/models/ApImageService.ts b/packages/backend/src/core/activitypub/models/ApImageService.ts
index 3691967270..e7ece87b01 100644
--- a/packages/backend/src/core/activitypub/models/ApImageService.ts
+++ b/packages/backend/src/core/activitypub/models/ApImageService.ts
@@ -5,10 +5,9 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
-import type { DriveFilesRepository } from '@/models/_.js';
+import type { DriveFilesRepository, MiMeta } from '@/models/_.js';
 import type { MiRemoteUser } from '@/models/User.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
-import { MetaService } from '@/core/MetaService.js';
 import { truncate } from '@/misc/truncate.js';
 import { DB_MAX_IMAGE_COMMENT_LENGTH } from '@/const.js';
 import { DriveService } from '@/core/DriveService.js';
@@ -24,10 +23,12 @@ export class ApImageService {
 	private logger: Logger;
 
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,
 
-		private metaService: MetaService,
 		private apResolverService: ApResolverService,
 		private driveService: DriveService,
 		private apLoggerService: ApLoggerService,
@@ -63,12 +64,10 @@ export class ApImageService {
 
 		this.logger.info(`Creating the Image: ${image.url}`);
 
-		const instance = await this.metaService.fetch();
-
 		// Cache if remote file cache is on AND either
 		// 1. remote sensitive file is also on
 		// 2. or the image is not sensitive
-		const shouldBeCached = instance.cacheRemoteFiles && (instance.cacheRemoteSensitiveFiles || !image.sensitive);
+		const shouldBeCached = this.meta.cacheRemoteFiles && (this.meta.cacheRemoteSensitiveFiles || !image.sensitive);
 
 		const file = await this.driveService.uploadFromUrl({
 			url: image.url,
diff --git a/packages/backend/src/core/activitypub/models/ApNoteService.ts b/packages/backend/src/core/activitypub/models/ApNoteService.ts
index 5b75da22a0..2d333b3634 100644
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -6,13 +6,12 @@
 import { forwardRef, Inject, Injectable } from '@nestjs/common';
 import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { PollsRepository, EmojisRepository } from '@/models/_.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 { toArray, toSingle, unique } from '@/misc/prelude/array.js';
 import type { MiEmoji } from '@/models/Emoji.js';
-import { MetaService } from '@/core/MetaService.js';
 import { AppLockService } from '@/core/AppLockService.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import { NoteCreateService } from '@/core/NoteCreateService.js';
@@ -46,6 +45,9 @@ export class ApNoteService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.pollsRepository)
 		private pollsRepository: PollsRepository,
 
@@ -65,7 +67,6 @@ export class ApNoteService {
 		private apMentionService: ApMentionService,
 		private apImageService: ApImageService,
 		private apQuestionService: ApQuestionService,
-		private metaService: MetaService,
 		private appLockService: AppLockService,
 		private pollService: PollService,
 		private noteCreateService: NoteCreateService,
@@ -182,7 +183,7 @@ export class ApNoteService {
 		/**
 		 * 禁止ワードチェック
 		 */
-		const hasProhibitedWords = await this.noteCreateService.checkProhibitedWordsContain({ cw, text, pollChoices: poll?.choices });
+		const hasProhibitedWords = this.noteCreateService.checkProhibitedWordsContain({ cw, text, pollChoices: poll?.choices });
 		if (hasProhibitedWords) {
 			throw new IdentifiableError('689ee33f-f97c-479a-ac49-1b9f8140af99', 'Note contains prohibited words');
 		}
@@ -335,9 +336,7 @@ export class ApNoteService {
 	public async resolveNote(value: string | IObject, options: { sentFrom?: URL, resolver?: Resolver } = {}): Promise<MiNote | null> {
 		const uri = getApId(value);
 
-		// ブロックしていたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, this.utilityService.extractDbHost(uri))) {
+		if (!this.utilityService.isFederationAllowedUri(uri)) {
 			throw new StatusError('blocked host', 451);
 		}
 
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index f3ddf3952c..e042a85782 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -8,7 +8,7 @@ import promiseLimit from 'promise-limit';
 import { DataSource } from 'typeorm';
 import { ModuleRef } from '@nestjs/core';
 import { DI } from '@/di-symbols.js';
-import type { FollowingsRepository, InstancesRepository, UserProfilesRepository, UserPublickeysRepository, UsersRepository } from '@/models/_.js';
+import type { FollowingsRepository, InstancesRepository, MiMeta, UserProfilesRepository, UserPublickeysRepository, UsersRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
 import type { MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import { MiUser } from '@/models/User.js';
@@ -35,7 +35,6 @@ import type { UtilityService } from '@/core/UtilityService.js';
 import type { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
 import { RoleService } from '@/core/RoleService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import type { AccountMoveService } from '@/core/AccountMoveService.js';
 import { checkHttps } from '@/misc/check-https.js';
@@ -46,7 +45,7 @@ import type { ApNoteService } from './ApNoteService.js';
 import type { ApMfmService } from '../ApMfmService.js';
 import type { ApResolverService, Resolver } from '../ApResolverService.js';
 import type { ApLoggerService } from '../ApLoggerService.js';
-// eslint-disable-next-line @typescript-eslint/consistent-type-imports
+
 import type { ApImageService } from './ApImageService.js';
 import type { IActor, ICollection, IObject, IOrderedCollection } from '../type.js';
 
@@ -62,7 +61,6 @@ export class ApPersonService implements OnModuleInit {
 	private driveFileEntityService: DriveFileEntityService;
 	private idService: IdService;
 	private globalEventService: GlobalEventService;
-	private metaService: MetaService;
 	private federatedInstanceService: FederatedInstanceService;
 	private fetchInstanceMetadataService: FetchInstanceMetadataService;
 	private cacheService: CacheService;
@@ -84,6 +82,9 @@ export class ApPersonService implements OnModuleInit {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.db)
 		private db: DataSource,
 
@@ -112,7 +113,6 @@ export class ApPersonService implements OnModuleInit {
 		this.driveFileEntityService = this.moduleRef.get('DriveFileEntityService');
 		this.idService = this.moduleRef.get('IdService');
 		this.globalEventService = this.moduleRef.get('GlobalEventService');
-		this.metaService = this.moduleRef.get('MetaService');
 		this.federatedInstanceService = this.moduleRef.get('FederatedInstanceService');
 		this.fetchInstanceMetadataService = this.moduleRef.get('FetchInstanceMetadataService');
 		this.cacheService = this.moduleRef.get('CacheService');
@@ -307,8 +307,8 @@ export class ApPersonService implements OnModuleInit {
 						this.logger.error('error occurred while fetching following/followers collection', { stack: err });
 					}
 					return 'private';
-				})
-			)
+				}),
+			),
 		);
 
 		const bday = person['vcard:bday']?.match(/^\d{4}-\d{2}-\d{2}/);
@@ -370,6 +370,7 @@ export class ApPersonService implements OnModuleInit {
 				await transactionalEntityManager.save(new MiUserProfile({
 					userId: user.id,
 					description: _description,
+					followedMessage: person._misskey_followedMessage != null ? truncate(person._misskey_followedMessage, 256) : null,
 					url,
 					fields,
 					followingVisibility,
@@ -407,10 +408,10 @@ export class ApPersonService implements OnModuleInit {
 		this.cacheService.uriPersonCache.set(user.uri, user);
 
 		// Register host
-		this.federatedInstanceService.fetch(host).then(async i => {
+		this.federatedInstanceService.fetch(host).then(i => {
 			this.instancesRepository.increment({ id: i.id }, 'usersCount', 1);
 			this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
-			if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.newUser(i.host);
 			}
 		});
@@ -494,8 +495,8 @@ export class ApPersonService implements OnModuleInit {
 						return undefined;
 					}
 					return 'private';
-				})
-			)
+				}),
+			),
 		);
 
 		const bday = person['vcard:bday']?.match(/^\d{4}-\d{2}-\d{2}/);
@@ -566,6 +567,7 @@ export class ApPersonService implements OnModuleInit {
 			url,
 			fields,
 			description: _description,
+			followedMessage: person._misskey_followedMessage != null ? truncate(person._misskey_followedMessage, 256) : null,
 			followingVisibility,
 			followersVisibility,
 			birthday: bday?.[0] ?? null,
diff --git a/packages/backend/src/core/activitypub/type.ts b/packages/backend/src/core/activitypub/type.ts
index 16812b7a4d..154965b9d5 100644
--- a/packages/backend/src/core/activitypub/type.ts
+++ b/packages/backend/src/core/activitypub/type.ts
@@ -13,6 +13,7 @@ export interface IObject {
 	name?: string | null;
 	summary?: string;
 	_misskey_summary?: string;
+	_misskey_followedMessage?: string | null;
 	published?: string;
 	cc?: ApObject;
 	to?: ApObject;
diff --git a/packages/backend/src/core/chart/charts/federation.ts b/packages/backend/src/core/chart/charts/federation.ts
index c2329a2f73..c9b43cc66d 100644
--- a/packages/backend/src/core/chart/charts/federation.ts
+++ b/packages/backend/src/core/chart/charts/federation.ts
@@ -5,10 +5,9 @@
 
 import { Injectable, Inject } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import type { FollowingsRepository, InstancesRepository } from '@/models/_.js';
+import type { FollowingsRepository, InstancesRepository, MiMeta } from '@/models/_.js';
 import { AppLockService } from '@/core/AppLockService.js';
 import { DI } from '@/di-symbols.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
@@ -24,13 +23,15 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 		@Inject(DI.db)
 		private db: DataSource,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.followingsRepository)
 		private followingsRepository: FollowingsRepository,
 
 		@Inject(DI.instancesRepository)
 		private instancesRepository: InstancesRepository,
 
-		private metaService: MetaService,
 		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
 	) {
@@ -43,8 +44,6 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 	}
 
 	protected async tickMinor(): Promise<Partial<KVs<typeof schema>>> {
-		const meta = await this.metaService.fetch();
-
 		const suspendedInstancesQuery = this.instancesRepository.createQueryBuilder('instance')
 			.select('instance.host')
 			.where('instance.suspensionState != \'none\'');
@@ -65,21 +64,21 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 			this.followingsRepository.createQueryBuilder('following')
 				.select('COUNT(DISTINCT following.followeeHost)')
 				.where('following.followeeHost IS NOT NULL')
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ANY(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere(`following.followeeHost NOT IN (${ suspendedInstancesQuery.getQuery() })`)
 				.getRawOne()
 				.then(x => parseInt(x.count, 10)),
 			this.followingsRepository.createQueryBuilder('following')
 				.select('COUNT(DISTINCT following.followerHost)')
 				.where('following.followerHost IS NOT NULL')
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'following.followerHost NOT ILIKE ANY(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'following.followerHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere(`following.followerHost NOT IN (${ suspendedInstancesQuery.getQuery() })`)
 				.getRawOne()
 				.then(x => parseInt(x.count, 10)),
 			this.followingsRepository.createQueryBuilder('following')
 				.select('COUNT(DISTINCT following.followeeHost)')
 				.where('following.followeeHost IS NOT NULL')
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ANY(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'following.followeeHost NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere(`following.followeeHost NOT IN (${ suspendedInstancesQuery.getQuery() })`)
 				.andWhere(`following.followeeHost IN (${ pubsubSubQuery.getQuery() })`)
 				.setParameters(pubsubSubQuery.getParameters())
@@ -88,7 +87,7 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 			this.instancesRepository.createQueryBuilder('instance')
 				.select('COUNT(instance.id)')
 				.where(`instance.host IN (${ subInstancesQuery.getQuery() })`)
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ANY(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere('instance.suspensionState = \'none\'')
 				.andWhere('instance.isNotResponding = false')
 				.getRawOne()
@@ -96,7 +95,7 @@ export default class FederationChart extends Chart<typeof schema> { // eslint-di
 			this.instancesRepository.createQueryBuilder('instance')
 				.select('COUNT(instance.id)')
 				.where(`instance.host IN (${ pubInstancesQuery.getQuery() })`)
-				.andWhere(meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ANY(ARRAY[:...blocked])', { blocked: meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
+				.andWhere(this.meta.blockedHosts.length === 0 ? '1=1' : 'instance.host NOT ILIKE ALL(ARRAY[:...blocked])', { blocked: this.meta.blockedHosts.flatMap(x => [x, `%.${x}`]) })
 				.andWhere('instance.suspensionState = \'none\'')
 				.andWhere('instance.isNotResponding = false')
 				.getRawOne()
diff --git a/packages/backend/src/core/entities/InstanceEntityService.ts b/packages/backend/src/core/entities/InstanceEntityService.ts
index 4956bc22ce..284537b986 100644
--- a/packages/backend/src/core/entities/InstanceEntityService.ts
+++ b/packages/backend/src/core/entities/InstanceEntityService.ts
@@ -3,19 +3,22 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import type { Packed } from '@/misc/json-schema.js';
 import type { MiInstance } from '@/models/Instance.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { MiUser } from '@/models/User.js';
+import { DI } from '@/di-symbols.js';
+import { MiMeta } from '@/models/_.js';
 
 @Injectable()
 export class InstanceEntityService {
 	constructor(
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		private roleService: RoleService,
 
 		private utilityService: UtilityService,
@@ -27,7 +30,6 @@ export class InstanceEntityService {
 		instance: MiInstance,
 		me?: { id: MiUser['id']; } | null | undefined,
 	): Promise<Packed<'FederationInstance'>> {
-		const meta = await this.metaService.fetch();
 		const iAmModerator = me ? await this.roleService.isModerator(me as MiUser) : false;
 
 		return {
@@ -41,7 +43,7 @@ export class InstanceEntityService {
 			isNotResponding: instance.isNotResponding,
 			isSuspended: instance.suspensionState !== 'none',
 			suspensionState: instance.suspensionState,
-			isBlocked: this.utilityService.isBlockedHost(meta.blockedHosts, instance.host),
+			isBlocked: this.utilityService.isBlockedHost(this.meta.blockedHosts, instance.host),
 			softwareName: instance.softwareName,
 			softwareVersion: instance.softwareVersion,
 			openRegistrations: instance.openRegistrations,
@@ -49,8 +51,8 @@ export class InstanceEntityService {
 			description: instance.description,
 			maintainerName: instance.maintainerName,
 			maintainerEmail: instance.maintainerEmail,
-			isSilenced: this.utilityService.isSilencedHost(meta.silencedHosts, instance.host),
-			isMediaSilenced: this.utilityService.isMediaSilencedHost(meta.mediaSilencedHosts, instance.host),
+			isSilenced: this.utilityService.isSilencedHost(this.meta.silencedHosts, instance.host),
+			isMediaSilenced: this.utilityService.isMediaSilencedHost(this.meta.mediaSilencedHosts, instance.host),
 			iconUrl: instance.iconUrl,
 			faviconUrl: instance.faviconUrl,
 			themeColor: instance.themeColor,
diff --git a/packages/backend/src/core/entities/MetaEntityService.ts b/packages/backend/src/core/entities/MetaEntityService.ts
index 44ec0d6a7b..fbd982eb34 100644
--- a/packages/backend/src/core/entities/MetaEntityService.ts
+++ b/packages/backend/src/core/entities/MetaEntityService.ts
@@ -10,7 +10,6 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { MiMeta } from '@/models/Meta.js';
 import type { AdsRepository } from '@/models/_.js';
 import { MAX_NOTE_TEXT_LENGTH } from '@/const.js';
-import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { InstanceActorService } from '@/core/InstanceActorService.js';
@@ -24,11 +23,13 @@ export class MetaEntityService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.adsRepository)
 		private adsRepository: AdsRepository,
 
 		private userEntityService: UserEntityService,
-		private metaService: MetaService,
 		private instanceActorService: InstanceActorService,
 	) { }
 
@@ -37,7 +38,7 @@ export class MetaEntityService {
 		let instance = meta;
 
 		if (!instance) {
-			instance = await this.metaService.fetch();
+			instance = this.meta;
 		}
 
 		const ads = await this.adsRepository.createQueryBuilder('ads')
@@ -129,6 +130,7 @@ export class MetaEntityService {
 			mediaProxy: this.config.mediaProxy,
 			enableUrlPreview: instance.urlPreviewEnabled,
 			noteSearchableScope: (this.config.meilisearch == null || this.config.meilisearch.scope !== 'local') ? 'global' : 'local',
+			maxFileSize: this.config.maxFileSize,
 		};
 
 		return packed;
@@ -139,7 +141,7 @@ export class MetaEntityService {
 		let instance = meta;
 
 		if (!instance) {
-			instance = await this.metaService.fetch();
+			instance = this.meta;
 		}
 
 		const packed = await this.pack(instance);
diff --git a/packages/backend/src/core/entities/NoteEntityService.ts b/packages/backend/src/core/entities/NoteEntityService.ts
index 2cd092231c..c64e9151a7 100644
--- a/packages/backend/src/core/entities/NoteEntityService.ts
+++ b/packages/backend/src/core/entities/NoteEntityService.ts
@@ -11,11 +11,11 @@ import type { Packed } from '@/misc/json-schema.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiNote } from '@/models/Note.js';
-import type { MiNoteReaction } from '@/models/NoteReaction.js';
-import type { UsersRepository, NotesRepository, FollowingsRepository, PollsRepository, PollVotesRepository, NoteReactionsRepository, ChannelsRepository } from '@/models/_.js';
+import type { UsersRepository, NotesRepository, FollowingsRepository, PollsRepository, PollVotesRepository, NoteReactionsRepository, ChannelsRepository, MiMeta } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import { DebounceLoader } from '@/misc/loader.js';
 import { IdService } from '@/core/IdService.js';
+import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
 import type { OnModuleInit } from '@nestjs/common';
 import type { CustomEmojiService } from '../CustomEmojiService.js';
 import type { ReactionService } from '../ReactionService.js';
@@ -28,12 +28,16 @@ export class NoteEntityService implements OnModuleInit {
 	private driveFileEntityService: DriveFileEntityService;
 	private customEmojiService: CustomEmojiService;
 	private reactionService: ReactionService;
+	private reactionsBufferingService: ReactionsBufferingService;
 	private idService: IdService;
 	private noteLoader = new DebounceLoader(this.findNoteOrFail);
 
 	constructor(
 		private moduleRef: ModuleRef,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -59,6 +63,8 @@ export class NoteEntityService implements OnModuleInit {
 		//private driveFileEntityService: DriveFileEntityService,
 		//private customEmojiService: CustomEmojiService,
 		//private reactionService: ReactionService,
+		//private reactionsBufferingService: ReactionsBufferingService,
+		//private idService: IdService,
 	) {
 	}
 
@@ -67,6 +73,7 @@ export class NoteEntityService implements OnModuleInit {
 		this.driveFileEntityService = this.moduleRef.get('DriveFileEntityService');
 		this.customEmojiService = this.moduleRef.get('CustomEmojiService');
 		this.reactionService = this.moduleRef.get('ReactionService');
+		this.reactionsBufferingService = this.moduleRef.get('ReactionsBufferingService');
 		this.idService = this.moduleRef.get('IdService');
 	}
 
@@ -287,6 +294,7 @@ export class NoteEntityService implements OnModuleInit {
 			skipHide?: boolean;
 			withReactionAndUserPairCache?: boolean;
 			_hint_?: {
+				bufferedReactions: Map<MiNote['id'], { deltas: Record<string, number>; pairs: ([MiUser['id'], string])[] }> | null;
 				myReactions: Map<MiNote['id'], string | null>;
 				packedFiles: Map<MiNote['fileIds'][number], Packed<'DriveFile'> | null>;
 				packedUsers: Map<MiUser['id'], Packed<'UserLite'>>
@@ -303,6 +311,15 @@ export class NoteEntityService implements OnModuleInit {
 		const note = typeof src === 'object' ? src : await this.noteLoader.load(src);
 		const host = note.userHost;
 
+		const bufferedReactions = opts._hint_?.bufferedReactions != null
+			? (opts._hint_.bufferedReactions.get(note.id) ?? { deltas: {}, pairs: [] })
+			: this.meta.enableReactionsBuffering
+				? await this.reactionsBufferingService.get(note.id)
+				: { deltas: {}, pairs: [] };
+		const reactions = this.reactionService.convertLegacyReactions(this.reactionsBufferingService.mergeReactions(note.reactions, bufferedReactions.deltas ?? {}));
+
+		const reactionAndUserPairCache = note.reactionAndUserPairCache.concat(bufferedReactions.pairs.map(x => x.join('/')));
+
 		let text = note.text;
 
 		if (note.name && (note.url ?? note.uri)) {
@@ -315,7 +332,7 @@ export class NoteEntityService implements OnModuleInit {
 				: await this.channelsRepository.findOneBy({ id: note.channelId })
 			: null;
 
-		const reactionEmojiNames = Object.keys(note.reactions)
+		const reactionEmojiNames = Object.keys(reactions)
 			.filter(x => x.startsWith(':') && x.includes('@') && !x.includes('@.')) // リモートカスタム絵文字のみ
 			.map(x => this.reactionService.decodeReaction(x).reaction.replaceAll(':', ''));
 		const packedFiles = options?._hint_?.packedFiles;
@@ -334,10 +351,10 @@ export class NoteEntityService implements OnModuleInit {
 			visibleUserIds: note.visibility === 'specified' ? note.visibleUserIds : undefined,
 			renoteCount: note.renoteCount,
 			repliesCount: note.repliesCount,
-			reactionCount: Object.values(note.reactions).reduce((a, b) => a + b, 0),
-			reactions: this.reactionService.convertLegacyReactions(note.reactions),
+			reactionCount: Object.values(reactions).reduce((a, b) => a + b, 0),
+			reactions: reactions,
 			reactionEmojis: this.customEmojiService.populateEmojis(reactionEmojiNames, host),
-			reactionAndUserPairCache: opts.withReactionAndUserPairCache ? note.reactionAndUserPairCache : undefined,
+			reactionAndUserPairCache: opts.withReactionAndUserPairCache ? reactionAndUserPairCache : undefined,
 			emojis: host != null ? this.customEmojiService.populateEmojis(note.emojis, host) : undefined,
 			tags: note.tags.length > 0 ? note.tags : undefined,
 			fileIds: note.fileIds,
@@ -376,8 +393,12 @@ export class NoteEntityService implements OnModuleInit {
 
 				poll: note.hasPoll ? this.populatePoll(note, meId) : undefined,
 
-				...(meId && Object.keys(note.reactions).length > 0 ? {
-					myReaction: this.populateMyReaction(note, meId, options?._hint_),
+				...(meId && Object.keys(reactions).length > 0 ? {
+					myReaction: this.populateMyReaction({
+						id: note.id,
+						reactions: reactions,
+						reactionAndUserPairCache: reactionAndUserPairCache,
+					}, meId, options?._hint_),
 				} : {}),
 			} : {}),
 		});
@@ -400,6 +421,8 @@ export class NoteEntityService implements OnModuleInit {
 	) {
 		if (notes.length === 0) return [];
 
+		const bufferedReactions = this.meta.enableReactionsBuffering ? await this.reactionsBufferingService.getMany(notes.map(x => x.id)) : null;
+
 		const meId = me ? me.id : null;
 		const myReactionsMap = new Map<MiNote['id'], string | null>();
 		if (meId) {
@@ -410,23 +433,33 @@ export class NoteEntityService implements OnModuleInit {
 
 			for (const note of notes) {
 				if (note.renote && (note.text == null && note.fileIds.length === 0)) { // pure renote
-					const reactionsCount = Object.values(note.renote.reactions).reduce((a, b) => a + b, 0);
+					const reactionsCount = Object.values(this.reactionsBufferingService.mergeReactions(note.renote.reactions, bufferedReactions?.get(note.renote.id)?.deltas ?? {})).reduce((a, b) => a + b, 0);
 					if (reactionsCount === 0) {
 						myReactionsMap.set(note.renote.id, null);
-					} else if (reactionsCount <= note.renote.reactionAndUserPairCache.length) {
-						const pair = note.renote.reactionAndUserPairCache.find(p => p.startsWith(meId));
-						myReactionsMap.set(note.renote.id, pair ? pair.split('/')[1] : null);
+					} else if (reactionsCount <= note.renote.reactionAndUserPairCache.length + (bufferedReactions?.get(note.renote.id)?.pairs.length ?? 0)) {
+						const pairInBuffer = bufferedReactions?.get(note.renote.id)?.pairs.find(p => p[0] === meId);
+						if (pairInBuffer) {
+							myReactionsMap.set(note.renote.id, pairInBuffer[1]);
+						} else {
+							const pair = note.renote.reactionAndUserPairCache.find(p => p.startsWith(meId));
+							myReactionsMap.set(note.renote.id, pair ? pair.split('/')[1] : null);
+						}
 					} else {
 						idsNeedFetchMyReaction.add(note.renote.id);
 					}
 				} else {
 					if (note.id < oldId) {
-						const reactionsCount = Object.values(note.reactions).reduce((a, b) => a + b, 0);
+						const reactionsCount = Object.values(this.reactionsBufferingService.mergeReactions(note.reactions, bufferedReactions?.get(note.id)?.deltas ?? {})).reduce((a, b) => a + b, 0);
 						if (reactionsCount === 0) {
 							myReactionsMap.set(note.id, null);
-						} else if (reactionsCount <= note.reactionAndUserPairCache.length) {
-							const pair = note.reactionAndUserPairCache.find(p => p.startsWith(meId));
-							myReactionsMap.set(note.id, pair ? pair.split('/')[1] : null);
+						} else if (reactionsCount <= note.reactionAndUserPairCache.length + (bufferedReactions?.get(note.id)?.pairs.length ?? 0)) {
+							const pairInBuffer = bufferedReactions?.get(note.id)?.pairs.find(p => p[0] === meId);
+							if (pairInBuffer) {
+								myReactionsMap.set(note.id, pairInBuffer[1]);
+							} else {
+								const pair = note.reactionAndUserPairCache.find(p => p.startsWith(meId));
+								myReactionsMap.set(note.id, pair ? pair.split('/')[1] : null);
+							}
 						} else {
 							idsNeedFetchMyReaction.add(note.id);
 						}
@@ -461,6 +494,7 @@ export class NoteEntityService implements OnModuleInit {
 		return await Promise.all(notes.map(n => this.pack(n, me, {
 			...options,
 			_hint_: {
+				bufferedReactions,
 				myReactions: myReactionsMap,
 				packedFiles,
 				packedUsers,
diff --git a/packages/backend/src/core/entities/NotificationEntityService.ts b/packages/backend/src/core/entities/NotificationEntityService.ts
index f393513510..dff6968f9c 100644
--- a/packages/backend/src/core/entities/NotificationEntityService.ts
+++ b/packages/backend/src/core/entities/NotificationEntityService.ts
@@ -59,7 +59,7 @@ export class NotificationEntityService implements OnModuleInit {
 	async #packInternal <T extends MiNotification | MiGroupedNotification> (
 		src: T,
 		meId: MiUser['id'],
-		// eslint-disable-next-line @typescript-eslint/ban-types
+		 
 		options: {
 			checkValidNotifier?: boolean;
 		},
@@ -159,9 +159,16 @@ export class NotificationEntityService implements OnModuleInit {
 			...(notification.type === 'roleAssigned' ? {
 				role: role,
 			} : {}),
+			...(notification.type === 'followRequestAccepted' ? {
+				message: notification.message,
+			} : {}),
 			...(notification.type === 'achievementEarned' ? {
 				achievement: notification.achievement,
 			} : {}),
+			...(notification.type === 'exportCompleted' ? {
+				exportedEntity: notification.exportedEntity,
+				fileId: notification.fileId,
+			} : {}),
 			...(notification.type === 'app' ? {
 				body: notification.customBody,
 				header: notification.customHeader,
@@ -229,7 +236,7 @@ export class NotificationEntityService implements OnModuleInit {
 	public async pack(
 		src: MiNotification | MiGroupedNotification,
 		meId: MiUser['id'],
-		// eslint-disable-next-line @typescript-eslint/ban-types
+		 
 		options: {
 			checkValidNotifier?: boolean;
 		},
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index 9bf568bc90..69e2d6fc89 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -508,7 +508,7 @@ export class UserEntityService implements OnModuleInit {
 					name: r.name,
 					iconUrl: r.iconUrl,
 					displayOrder: r.displayOrder,
-				}))
+				})),
 			) : undefined,
 
 			...(isDetailed ? {
@@ -567,6 +567,7 @@ export class UserEntityService implements OnModuleInit {
 			...(isDetailed && isMe ? {
 				avatarId: user.avatarId,
 				bannerId: user.bannerId,
+				followedMessage: profile!.followedMessage,
 				isModerator: isModerator,
 				isAdmin: isAdmin,
 				injectFeaturedNote: profile!.injectFeaturedNote,
@@ -635,6 +636,7 @@ export class UserEntityService implements OnModuleInit {
 				isRenoteMuted: relation.isRenoteMuted,
 				notify: relation.following?.notify ?? 'none',
 				withReplies: relation.following?.withReplies ?? false,
+				followedMessage: relation.isFollowing ? profile!.followedMessage : undefined,
 			} : {}),
 		} as Promiseable<Packed<S>>;
 
diff --git a/packages/backend/src/daemons/ServerStatsService.ts b/packages/backend/src/daemons/ServerStatsService.ts
index 2c70344c94..d229efb123 100644
--- a/packages/backend/src/daemons/ServerStatsService.ts
+++ b/packages/backend/src/daemons/ServerStatsService.ts
@@ -3,13 +3,14 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import si from 'systeminformation';
 import Xev from 'xev';
 import * as osUtils from 'os-utils';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import type { OnApplicationShutdown } from '@nestjs/common';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
 
 const ev = new Xev();
 
@@ -23,7 +24,8 @@ export class ServerStatsService implements OnApplicationShutdown {
 	private intervalId: NodeJS.Timeout | null = null;
 
 	constructor(
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private meta: MiMeta,
 	) {
 	}
 
@@ -32,7 +34,7 @@ export class ServerStatsService implements OnApplicationShutdown {
 	 */
 	@bindThis
 	public async start(): Promise<void> {
-		if (!(await this.metaService.fetch(true)).enableServerMachineStats) return;
+		if (!this.meta.enableServerMachineStats) return;
 
 		const log = [] as any[];
 
diff --git a/packages/backend/src/decorators.ts b/packages/backend/src/decorators.ts
index 21777657d1..42f925e125 100644
--- a/packages/backend/src/decorators.ts
+++ b/packages/backend/src/decorators.ts
@@ -10,8 +10,9 @@
  * The getter will return a .bind version of the function
  * and memoize the result against a symbol on the instance
  */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
 export function bindThis(target: any, key: string, descriptor: any) {
-	let fn = descriptor.value;
+	const fn = descriptor.value;
 
 	if (typeof fn !== 'function') {
 		throw new TypeError(`@bindThis decorator can only be applied to methods not: ${typeof fn}`);
@@ -21,26 +22,18 @@ export function bindThis(target: any, key: string, descriptor: any) {
 		configurable: true,
 		get() {
 			// eslint-disable-next-line no-prototype-builtins
-			if (this === target.prototype || this.hasOwnProperty(key) ||
-        typeof fn !== 'function') {
+			if (this === target.prototype || this.hasOwnProperty(key)) {
 				return fn;
 			}
 
 			const boundFn = fn.bind(this);
-			Object.defineProperty(this, key, {
+			Reflect.defineProperty(this, key, {
+				value: boundFn,
 				configurable: true,
-				get() {
-					return boundFn;
-				},
-				set(value) {
-					fn = value;
-					delete this[key];
-				},
+				writable: true,
 			});
+
 			return boundFn;
 		},
-		set(value: any) {
-			fn = value;
-		},
 	};
 }
diff --git a/packages/backend/src/di-symbols.ts b/packages/backend/src/di-symbols.ts
index 271082b4ff..e599fc7b37 100644
--- a/packages/backend/src/di-symbols.ts
+++ b/packages/backend/src/di-symbols.ts
@@ -6,11 +6,13 @@
 export const DI = {
 	config: Symbol('config'),
 	db: Symbol('db'),
+	meta: Symbol('meta'),
 	meilisearch: Symbol('meilisearch'),
 	redis: Symbol('redis'),
 	redisForPub: Symbol('redisForPub'),
 	redisForSub: Symbol('redisForSub'),
 	redisForTimelines: Symbol('redisForTimelines'),
+	redisForReactions: Symbol('redisForReactions'),
 
 	//#region Repositories
 	usersRepository: Symbol('usersRepository'),
diff --git a/packages/backend/src/misc/collapsed-queue.ts b/packages/backend/src/misc/collapsed-queue.ts
new file mode 100644
index 0000000000..5bc20a78ae
--- /dev/null
+++ b/packages/backend/src/misc/collapsed-queue.ts
@@ -0,0 +1,44 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+type Job<V> = {
+	value: V;
+	timer: NodeJS.Timeout;
+};
+
+// TODO: redis使えるようにする
+export class CollapsedQueue<K, V> {
+	private jobs: Map<K, Job<V>> = new Map();
+
+	constructor(
+		private timeout: number,
+		private collapse: (oldValue: V, newValue: V) => V,
+		private perform: (key: K, value: V) => Promise<void>,
+	) {}
+
+	enqueue(key: K, value: V) {
+		if (this.jobs.has(key)) {
+			const old = this.jobs.get(key)!;
+			const merged = this.collapse(old.value, value);
+			this.jobs.set(key, { ...old, value: merged });
+		} else {
+			const timer = setTimeout(() => {
+				const job = this.jobs.get(key)!;
+				this.jobs.delete(key);
+				this.perform(key, job.value);
+			}, this.timeout);
+			this.jobs.set(key, { value, timer });
+		}
+	}
+
+	async performAllNow() {
+		const entries = [...this.jobs.entries()];
+		this.jobs.clear();
+		for (const [_key, job] of entries) {
+			clearTimeout(job.timer);
+		}
+		await Promise.allSettled(entries.map(([key, job]) => this.perform(key, job.value)));
+	}
+}
diff --git a/packages/backend/src/misc/fastify-hook-handlers.ts b/packages/backend/src/misc/fastify-hook-handlers.ts
index 3e1c099e00..fa3ef0a267 100644
--- a/packages/backend/src/misc/fastify-hook-handlers.ts
+++ b/packages/backend/src/misc/fastify-hook-handlers.ts
@@ -8,7 +8,7 @@ import type { onRequestHookHandler } from 'fastify';
 export const handleRequestRedirectToOmitSearch: onRequestHookHandler = (request, reply, done) => {
 	const index = request.url.indexOf('?');
 	if (~index) {
-		reply.redirect(301, request.url.slice(0, index));
+		reply.redirect(request.url.slice(0, index), 301);
 	}
 	done();
 };
diff --git a/packages/backend/src/misc/json-schema.ts b/packages/backend/src/misc/json-schema.ts
index a721b8663c..040e36228c 100644
--- a/packages/backend/src/misc/json-schema.ts
+++ b/packages/backend/src/misc/json-schema.ts
@@ -144,7 +144,9 @@ export interface Schema extends OfSchema {
 	readonly type?: TypeStringef;
 	readonly nullable?: boolean;
 	readonly optional?: boolean;
+	readonly prefixItems?: ReadonlyArray<Schema>;
 	readonly items?: Schema;
+	readonly unevaluatedItems?: Schema | boolean;
 	readonly properties?: Obj;
 	readonly required?: ReadonlyArray<Extract<keyof NonNullable<this['properties']>, string>>;
 	readonly description?: string;
@@ -198,6 +200,7 @@ type UnionSchemaType<a extends readonly any[], X extends Schema = a[number]> = X
 //type UnionObjectSchemaType<a extends readonly any[], X extends Schema = a[number]> = X extends any ? ObjectSchemaType<X> : never;
 type UnionObjType<s extends Obj, a extends readonly any[], X extends ReadonlyArray<keyof s> = a[number]> = X extends any ? ObjType<s, X> : never;
 type ArrayUnion<T> = T extends any ? Array<T> : never;
+type ArrayToTuple<X extends ReadonlyArray<Schema>> = { [K in keyof X]: SchemaType<X[K]> };
 
 type ObjectSchemaTypeDef<p extends Schema> =
 	p['ref'] extends keyof typeof refs ? Packed<p['ref']> :
@@ -232,6 +235,12 @@ export type SchemaTypeDef<p extends Schema> =
 			p['items']['allOf'] extends ReadonlyArray<Schema> ? UnionToIntersection<UnionSchemaType<NonNullable<p['items']['allOf']>>>[] :
 			never
 		) :
+		p['prefixItems'] extends ReadonlyArray<Schema> ? (
+			p['items'] extends NonNullable<Schema> ? [...ArrayToTuple<p['prefixItems']>, ...SchemaType<p['items']>[]] :
+			p['items'] extends false ? ArrayToTuple<p['prefixItems']> :
+			p['unevaluatedItems'] extends false ? ArrayToTuple<p['prefixItems']> :
+			[...ArrayToTuple<p['prefixItems']>, ...unknown[]]
+		) :
 		p['items'] extends NonNullable<Schema> ? SchemaType<p['items']>[] :
 		any[]
 	) :
diff --git a/packages/backend/src/models/Meta.ts b/packages/backend/src/models/Meta.ts
index 70d41801b5..d29689f907 100644
--- a/packages/backend/src/models/Meta.ts
+++ b/packages/backend/src/models/Meta.ts
@@ -589,6 +589,11 @@ export class MiMeta {
 	})
 	public perUserListTimelineCacheMax: number;
 
+	@Column('boolean', {
+		default: false,
+	})
+	public enableReactionsBuffering: boolean;
+
 	@Column('integer', {
 		default: 0,
 	})
@@ -625,4 +630,17 @@ export class MiMeta {
 		nullable: true,
 	})
 	public urlPreviewUserAgent: string | null;
+
+	@Column('varchar', {
+		length: 128,
+		default: 'all',
+	})
+	public federation: 'all' | 'specified' | 'none';
+
+	@Column('varchar', {
+		length: 1024,
+		array: true,
+		default: '{}',
+	})
+	public federationHosts: string[];
 }
diff --git a/packages/backend/src/models/Notification.ts b/packages/backend/src/models/Notification.ts
index df88b99636..c1d3d42134 100644
--- a/packages/backend/src/models/Notification.ts
+++ b/packages/backend/src/models/Notification.ts
@@ -7,6 +7,8 @@ import { MiUser } from './User.js';
 import { MiNote } from './Note.js';
 import { MiAccessToken } from './AccessToken.js';
 import { MiRole } from './Role.js';
+import { MiDriveFile } from './DriveFile.js';
+import { userExportableEntities } from '@/types.js';
 
 export type MiNotification = {
 	type: 'note';
@@ -67,6 +69,7 @@ export type MiNotification = {
 	id: string;
 	createdAt: string;
 	notifierId: MiUser['id'];
+	message: string | null;
 } | {
 	type: 'roleAssigned';
 	id: string;
@@ -78,6 +81,12 @@ export type MiNotification = {
 	createdAt: string;
 	achievement: string;
 } | {
+	type: 'exportCompleted';
+	id: string;
+	createdAt: string;
+	exportedEntity: typeof userExportableEntities[number];
+	fileId: MiDriveFile['id'];
+} | {
 	type: 'app';
 	id: string;
 	createdAt: string;
@@ -85,7 +94,7 @@ export type MiNotification = {
 	/**
 	 * アプリ通知のbody
 	 */
-	customBody: string | null;
+	customBody: string;
 
 	/**
 	 * アプリ通知のheader
diff --git a/packages/backend/src/models/User.ts b/packages/backend/src/models/User.ts
index 9e2d7a3444..805a1e75ae 100644
--- a/packages/backend/src/models/User.ts
+++ b/packages/backend/src/models/User.ts
@@ -155,6 +155,11 @@ export class MiUser {
 	})
 	public tags: string[];
 
+	@Column('integer', {
+		default: 0,
+	})
+	public score: number;
+
 	@Column('boolean', {
 		default: false,
 		comment: 'Whether the User is suspended.',
@@ -289,5 +294,6 @@ export const localUsernameSchema = { type: 'string', pattern: /^\w{1,20}$/.toStr
 export const passwordSchema = { type: 'string', minLength: 1 } as const;
 export const nameSchema = { type: 'string', minLength: 1, maxLength: 50 } as const;
 export const descriptionSchema = { type: 'string', minLength: 1, maxLength: 1500 } as const;
+export const followedMessageSchema = { type: 'string', minLength: 1, maxLength: 256 } as const;
 export const locationSchema = { type: 'string', minLength: 1, maxLength: 50 } as const;
 export const birthdaySchema = { type: 'string', pattern: /^([0-9]{4})-([0-9]{2})-([0-9]{2})$/.toString().slice(1, -1) } as const;
diff --git a/packages/backend/src/models/UserProfile.ts b/packages/backend/src/models/UserProfile.ts
index 7dbe0b3717..5544555296 100644
--- a/packages/backend/src/models/UserProfile.ts
+++ b/packages/backend/src/models/UserProfile.ts
@@ -42,6 +42,14 @@ export class MiUserProfile {
 	})
 	public description: string | null;
 
+	// フォローされた際のメッセージ
+	@Column('varchar', {
+		length: 256, nullable: true,
+	})
+	public followedMessage: string | null;
+
+	// TODO: 鍵アカウントの場合の、フォローリクエスト受信時のメッセージも設定できるようにする
+
 	@Column('jsonb', {
 		default: [],
 	})
diff --git a/packages/backend/src/models/Webhook.ts b/packages/backend/src/models/Webhook.ts
index db24c03b3d..b4cab4edc8 100644
--- a/packages/backend/src/models/Webhook.ts
+++ b/packages/backend/src/models/Webhook.ts
@@ -8,6 +8,7 @@ import { id } from './util/id.js';
 import { MiUser } from './User.js';
 
 export const webhookEventTypes = ['mention', 'unfollow', 'follow', 'followed', 'note', 'reply', 'renote', 'reaction'] as const;
+export type WebhookEventTypes = typeof webhookEventTypes[number];
 
 @Entity('webhook')
 export class MiWebhook {
diff --git a/packages/backend/src/models/json-schema/meta.ts b/packages/backend/src/models/json-schema/meta.ts
index 3bcf9cac92..99feeaa7d7 100644
--- a/packages/backend/src/models/json-schema/meta.ts
+++ b/packages/backend/src/models/json-schema/meta.ts
@@ -253,6 +253,10 @@ export const packedMetaLiteSchema = {
 			optional: false, nullable: false,
 			default: 'local',
 		},
+		maxFileSize: {
+			type: 'number',
+			optional: false, nullable: false,
+		},
 	},
 } as const;
 
diff --git a/packages/backend/src/models/json-schema/notification.ts b/packages/backend/src/models/json-schema/notification.ts
index b4c4442758..2645010491 100644
--- a/packages/backend/src/models/json-schema/notification.ts
+++ b/packages/backend/src/models/json-schema/notification.ts
@@ -3,7 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { notificationTypes } from '@/types.js';
+import { ACHIEVEMENT_TYPES } from '@/core/AchievementService.js';
+import { notificationTypes, userExportableEntities } from '@/types.js';
 
 const baseSchema = {
 	type: 'object',
@@ -266,6 +267,10 @@ export const packedNotificationSchema = {
 				optional: false, nullable: false,
 				format: 'id',
 			},
+			message: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 		},
 	}, {
 		type: 'object',
@@ -294,6 +299,27 @@ export const packedNotificationSchema = {
 			achievement: {
 				type: 'string',
 				optional: false, nullable: false,
+				enum: ACHIEVEMENT_TYPES,
+			},
+		},
+	}, {
+		type: 'object',
+		properties: {
+			...baseSchema.properties,
+			type: {
+				type: 'string',
+				optional: false, nullable: false,
+				enum: ['exportCompleted'],
+			},
+			exportedEntity: {
+				type: 'string',
+				optional: false, nullable: false,
+				enum: userExportableEntities,
+			},
+			fileId: {
+				type: 'string',
+				optional: false, nullable: false,
+				format: 'id',
 			},
 		},
 	}, {
@@ -311,11 +337,11 @@ export const packedNotificationSchema = {
 			},
 			header: {
 				type: 'string',
-				optional: false, nullable: false,
+				optional: false, nullable: true,
 			},
 			icon: {
 				type: 'string',
-				optional: false, nullable: false,
+				optional: false, nullable: true,
 			},
 		},
 	}, {
diff --git a/packages/backend/src/models/json-schema/role.ts b/packages/backend/src/models/json-schema/role.ts
index 7366f05356..3537de94c8 100644
--- a/packages/backend/src/models/json-schema/role.ts
+++ b/packages/backend/src/models/json-schema/role.ts
@@ -272,6 +272,26 @@ export const packedRolePoliciesSchema = {
 			type: 'integer',
 			optional: false, nullable: false,
 		},
+		canImportAntennas: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportBlocking: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportFollowing: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportMuting: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
+		canImportUserLists: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
 	},
 } as const;
 
diff --git a/packages/backend/src/models/json-schema/user.ts b/packages/backend/src/models/json-schema/user.ts
index 947a9317d7..16c8a5a097 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -370,6 +370,10 @@ export const packedUserDetailedNotMeOnlySchema = {
 				ref: 'RoleLite',
 			},
 		},
+		followedMessage: {
+			type: 'string',
+			nullable: true, optional: true,
+		},
 		memo: {
 			type: 'string',
 			nullable: true, optional: false,
@@ -437,6 +441,10 @@ export const packedMeDetailedOnlySchema = {
 			nullable: true, optional: false,
 			format: 'id',
 		},
+		followedMessage: {
+			type: 'string',
+			nullable: true, optional: false,
+		},
 		isModerator: {
 			type: 'boolean',
 			nullable: true, optional: false,
diff --git a/packages/backend/src/queue/QueueProcessorModule.ts b/packages/backend/src/queue/QueueProcessorModule.ts
index a1fd38fcc5..0027b5ef3d 100644
--- a/packages/backend/src/queue/QueueProcessorModule.ts
+++ b/packages/backend/src/queue/QueueProcessorModule.ts
@@ -14,6 +14,7 @@ import { InboxProcessorService } from './processors/InboxProcessorService.js';
 import { UserWebhookDeliverProcessorService } from './processors/UserWebhookDeliverProcessorService.js';
 import { SystemWebhookDeliverProcessorService } from './processors/SystemWebhookDeliverProcessorService.js';
 import { CheckExpiredMutingsProcessorService } from './processors/CheckExpiredMutingsProcessorService.js';
+import { BakeBufferedReactionsProcessorService } from './processors/BakeBufferedReactionsProcessorService.js';
 import { CleanChartsProcessorService } from './processors/CleanChartsProcessorService.js';
 import { CleanProcessorService } from './processors/CleanProcessorService.js';
 import { CleanRemoteFilesProcessorService } from './processors/CleanRemoteFilesProcessorService.js';
@@ -51,6 +52,7 @@ import { RelationshipProcessorService } from './processors/RelationshipProcessor
 		ResyncChartsProcessorService,
 		CleanChartsProcessorService,
 		CheckExpiredMutingsProcessorService,
+		BakeBufferedReactionsProcessorService,
 		CleanProcessorService,
 		DeleteDriveFilesProcessorService,
 		ExportCustomEmojisProcessorService,
diff --git a/packages/backend/src/queue/QueueProcessorService.ts b/packages/backend/src/queue/QueueProcessorService.ts
index 7bd74f3210..e9e1c45224 100644
--- a/packages/backend/src/queue/QueueProcessorService.ts
+++ b/packages/backend/src/queue/QueueProcessorService.ts
@@ -39,6 +39,7 @@ import { TickChartsProcessorService } from './processors/TickChartsProcessorServ
 import { ResyncChartsProcessorService } from './processors/ResyncChartsProcessorService.js';
 import { CleanChartsProcessorService } from './processors/CleanChartsProcessorService.js';
 import { CheckExpiredMutingsProcessorService } from './processors/CheckExpiredMutingsProcessorService.js';
+import { BakeBufferedReactionsProcessorService } from './processors/BakeBufferedReactionsProcessorService.js';
 import { CleanProcessorService } from './processors/CleanProcessorService.js';
 import { AggregateRetentionProcessorService } from './processors/AggregateRetentionProcessorService.js';
 import { QueueLoggerService } from './QueueLoggerService.js';
@@ -118,6 +119,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 		private cleanChartsProcessorService: CleanChartsProcessorService,
 		private aggregateRetentionProcessorService: AggregateRetentionProcessorService,
 		private checkExpiredMutingsProcessorService: CheckExpiredMutingsProcessorService,
+		private bakeBufferedReactionsProcessorService: BakeBufferedReactionsProcessorService,
 		private cleanProcessorService: CleanProcessorService,
 	) {
 		this.logger = this.queueLoggerService.logger;
@@ -147,6 +149,7 @@ export class QueueProcessorService implements OnApplicationShutdown {
 					case 'cleanCharts': return this.cleanChartsProcessorService.process();
 					case 'aggregateRetention': return this.aggregateRetentionProcessorService.process();
 					case 'checkExpiredMutings': return this.checkExpiredMutingsProcessorService.process();
+					case 'bakeBufferedReactions': return this.bakeBufferedReactionsProcessorService.process();
 					case 'clean': return this.cleanProcessorService.process();
 					default: throw new Error(`unrecognized job type ${job.name} for system`);
 				}
diff --git a/packages/backend/src/queue/processors/BakeBufferedReactionsProcessorService.ts b/packages/backend/src/queue/processors/BakeBufferedReactionsProcessorService.ts
new file mode 100644
index 0000000000..d49c99f694
--- /dev/null
+++ b/packages/backend/src/queue/processors/BakeBufferedReactionsProcessorService.ts
@@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import type Logger from '@/logger.js';
+import { bindThis } from '@/decorators.js';
+import { ReactionsBufferingService } from '@/core/ReactionsBufferingService.js';
+import { QueueLoggerService } from '../QueueLoggerService.js';
+import type * as Bull from 'bullmq';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+
+@Injectable()
+export class BakeBufferedReactionsProcessorService {
+	private logger: Logger;
+
+	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
+		private reactionsBufferingService: ReactionsBufferingService,
+		private queueLoggerService: QueueLoggerService,
+	) {
+		this.logger = this.queueLoggerService.logger.createSubLogger('bake-buffered-reactions');
+	}
+
+	@bindThis
+	public async process(): Promise<void> {
+		if (!this.meta.enableReactionsBuffering) {
+			this.logger.info('Reactions buffering is disabled. Skipping...');
+			return;
+		}
+
+		this.logger.info('Baking buffered reactions...');
+
+		await this.reactionsBufferingService.bake();
+
+		this.logger.succ('All buffered reactions baked.');
+	}
+}
diff --git a/packages/backend/src/queue/processors/DeliverProcessorService.ts b/packages/backend/src/queue/processors/DeliverProcessorService.ts
index 4076e9da90..9590a4fe71 100644
--- a/packages/backend/src/queue/processors/DeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeliverProcessorService.ts
@@ -7,9 +7,8 @@ import { Inject, Injectable } from '@nestjs/common';
 import * as Bull from 'bullmq';
 import { Not } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { InstancesRepository } from '@/models/_.js';
+import type { InstancesRepository, MiMeta } from '@/models/_.js';
 import type Logger from '@/logger.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ApRequestService } from '@/core/activitypub/ApRequestService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { FetchInstanceMetadataService } from '@/core/FetchInstanceMetadataService.js';
@@ -31,10 +30,12 @@ export class DeliverProcessorService {
 	private latest: string | null;
 
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.instancesRepository)
 		private instancesRepository: InstancesRepository,
 
-		private metaService: MetaService,
 		private utilityService: UtilityService,
 		private federatedInstanceService: FederatedInstanceService,
 		private fetchInstanceMetadataService: FetchInstanceMetadataService,
@@ -52,9 +53,7 @@ export class DeliverProcessorService {
 	public async process(job: Bull.Job<DeliverJobData>): Promise<string> {
 		const { host } = new URL(job.data.to);
 
-		// ブロックしてたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, this.utilityService.toPuny(host))) {
+		if (!this.utilityService.isFederationAllowedUri(job.data.to)) {
 			return 'skip (blocked)';
 		}
 
@@ -88,7 +87,7 @@ export class DeliverProcessorService {
 				this.apRequestChart.deliverSucc();
 				this.federationChart.deliverd(i.host, true);
 
-				if (meta.enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.requestSent(i.host, true);
 				}
 			});
@@ -120,7 +119,7 @@ export class DeliverProcessorService {
 				this.apRequestChart.deliverFail();
 				this.federationChart.deliverd(i.host, false);
 
-				if (meta.enableChartsForFederatedInstances) {
+				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.requestSent(i.host, false);
 				}
 			});
diff --git a/packages/backend/src/queue/processors/ExportAntennasProcessorService.ts b/packages/backend/src/queue/processors/ExportAntennasProcessorService.ts
index 88c4ea29c0..b3111865ad 100644
--- a/packages/backend/src/queue/processors/ExportAntennasProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportAntennasProcessorService.ts
@@ -14,6 +14,7 @@ import { DriveService } from '@/core/DriveService.js';
 import { bindThis } from '@/decorators.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type { DBExportAntennasData } from '../types.js';
 import type * as Bull from 'bullmq';
@@ -35,6 +36,7 @@ export class ExportAntennasProcessorService {
 		private driveService: DriveService,
 		private utilityService: UtilityService,
 		private queueLoggerService: QueueLoggerService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-antennas');
 	}
@@ -95,6 +97,11 @@ export class ExportAntennasProcessorService {
 			const fileName = 'antennas-' + DateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.json';
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'json' });
 			this.logger.succ('Exported to: ' + driveFile.id);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'antenna',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportBlockingProcessorService.ts b/packages/backend/src/queue/processors/ExportBlockingProcessorService.ts
index 6ec3c18786..ecc439db69 100644
--- a/packages/backend/src/queue/processors/ExportBlockingProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportBlockingProcessorService.ts
@@ -13,6 +13,7 @@ import type Logger from '@/logger.js';
 import { DriveService } from '@/core/DriveService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
@@ -30,6 +31,7 @@ export class ExportBlockingProcessorService {
 		private blockingsRepository: BlockingsRepository,
 
 		private utilityService: UtilityService,
+		private notificationService: NotificationService,
 		private driveService: DriveService,
 		private queueLoggerService: QueueLoggerService,
 	) {
@@ -109,6 +111,11 @@ export class ExportBlockingProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'csv' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'blocking',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportClipsProcessorService.ts b/packages/backend/src/queue/processors/ExportClipsProcessorService.ts
index 01eab26e96..583ddbb745 100644
--- a/packages/backend/src/queue/processors/ExportClipsProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportClipsProcessorService.ts
@@ -19,6 +19,7 @@ import { bindThis } from '@/decorators.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import { Packed } from '@/misc/json-schema.js';
 import { IdService } from '@/core/IdService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
 import type { DbJobDataWithUser } from '../types.js';
@@ -43,6 +44,7 @@ export class ExportClipsProcessorService {
 		private driveService: DriveService,
 		private queueLoggerService: QueueLoggerService,
 		private idService: IdService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-clips');
 	}
@@ -79,6 +81,11 @@ export class ExportClipsProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'json' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'clip',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportCustomEmojisProcessorService.ts b/packages/backend/src/queue/processors/ExportCustomEmojisProcessorService.ts
index e4eb4791bd..e237cd4975 100644
--- a/packages/backend/src/queue/processors/ExportCustomEmojisProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportCustomEmojisProcessorService.ts
@@ -16,6 +16,7 @@ import type Logger from '@/logger.js';
 import { DriveService } from '@/core/DriveService.js';
 import { createTemp, createTempDir } from '@/misc/create-temp.js';
 import { DownloadService } from '@/core/DownloadService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
@@ -37,6 +38,7 @@ export class ExportCustomEmojisProcessorService {
 		private driveService: DriveService,
 		private downloadService: DownloadService,
 		private queueLoggerService: QueueLoggerService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-custom-emojis');
 	}
@@ -134,6 +136,12 @@ export class ExportCustomEmojisProcessorService {
 				const driveFile = await this.driveService.addFile({ user, path: archivePath, name: fileName, force: true });
 
 				this.logger.succ(`Exported to: ${driveFile.id}`);
+
+				this.notificationService.createNotification(user.id, 'exportCompleted', {
+					exportedEntity: 'customEmoji',
+					fileId: driveFile.id,
+				});
+
 				cleanup();
 				archiveCleanup();
 				resolve();
diff --git a/packages/backend/src/queue/processors/ExportFavoritesProcessorService.ts b/packages/backend/src/queue/processors/ExportFavoritesProcessorService.ts
index 7bb626dd31..b81feece01 100644
--- a/packages/backend/src/queue/processors/ExportFavoritesProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportFavoritesProcessorService.ts
@@ -16,6 +16,7 @@ import type { MiPoll } from '@/models/Poll.js';
 import type { MiNote } from '@/models/Note.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
 import type { DbJobDataWithUser } from '../types.js';
@@ -37,6 +38,7 @@ export class ExportFavoritesProcessorService {
 		private driveService: DriveService,
 		private queueLoggerService: QueueLoggerService,
 		private idService: IdService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-favorites');
 	}
@@ -123,6 +125,11 @@ export class ExportFavoritesProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'json' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'favorite',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportFollowingProcessorService.ts b/packages/backend/src/queue/processors/ExportFollowingProcessorService.ts
index 1cc80e66d7..903f962515 100644
--- a/packages/backend/src/queue/processors/ExportFollowingProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportFollowingProcessorService.ts
@@ -14,6 +14,7 @@ import { DriveService } from '@/core/DriveService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import type { MiFollowing } from '@/models/Following.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
@@ -36,6 +37,7 @@ export class ExportFollowingProcessorService {
 		private utilityService: UtilityService,
 		private driveService: DriveService,
 		private queueLoggerService: QueueLoggerService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-following');
 	}
@@ -113,6 +115,11 @@ export class ExportFollowingProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'csv' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'following',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportMutingProcessorService.ts b/packages/backend/src/queue/processors/ExportMutingProcessorService.ts
index 243b74f2c2..f9867ade29 100644
--- a/packages/backend/src/queue/processors/ExportMutingProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportMutingProcessorService.ts
@@ -13,6 +13,7 @@ import type Logger from '@/logger.js';
 import { DriveService } from '@/core/DriveService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
@@ -32,6 +33,7 @@ export class ExportMutingProcessorService {
 		private utilityService: UtilityService,
 		private driveService: DriveService,
 		private queueLoggerService: QueueLoggerService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-muting');
 	}
@@ -110,6 +112,11 @@ export class ExportMutingProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'csv' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'muting',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportNotesProcessorService.ts b/packages/backend/src/queue/processors/ExportNotesProcessorService.ts
index c7611012d7..9e2b678219 100644
--- a/packages/backend/src/queue/processors/ExportNotesProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportNotesProcessorService.ts
@@ -18,6 +18,7 @@ import { bindThis } from '@/decorators.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import { Packed } from '@/misc/json-schema.js';
 import { IdService } from '@/core/IdService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { JsonArrayStream } from '@/misc/JsonArrayStream.js';
 import { FileWriterStream } from '@/misc/FileWriterStream.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
@@ -112,6 +113,7 @@ export class ExportNotesProcessorService {
 		private queueLoggerService: QueueLoggerService,
 		private driveFileEntityService: DriveFileEntityService,
 		private idService: IdService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-notes');
 	}
@@ -150,6 +152,11 @@ export class ExportNotesProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'json' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'note',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ExportUserListsProcessorService.ts b/packages/backend/src/queue/processors/ExportUserListsProcessorService.ts
index ee87cff5d3..c483d79854 100644
--- a/packages/backend/src/queue/processors/ExportUserListsProcessorService.ts
+++ b/packages/backend/src/queue/processors/ExportUserListsProcessorService.ts
@@ -13,6 +13,7 @@ import type Logger from '@/logger.js';
 import { DriveService } from '@/core/DriveService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { UtilityService } from '@/core/UtilityService.js';
+import { NotificationService } from '@/core/NotificationService.js';
 import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type * as Bull from 'bullmq';
@@ -35,6 +36,7 @@ export class ExportUserListsProcessorService {
 		private utilityService: UtilityService,
 		private driveService: DriveService,
 		private queueLoggerService: QueueLoggerService,
+		private notificationService: NotificationService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('export-user-lists');
 	}
@@ -89,6 +91,11 @@ export class ExportUserListsProcessorService {
 			const driveFile = await this.driveService.addFile({ user, path, name: fileName, force: true, ext: 'csv' });
 
 			this.logger.succ(`Exported to: ${driveFile.id}`);
+
+			this.notificationService.createNotification(user.id, 'exportCompleted', {
+				exportedEntity: 'userList',
+				fileId: driveFile.id,
+			});
 		} finally {
 			cleanup();
 		}
diff --git a/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts b/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts
index 171809d25c..9e1b8fee70 100644
--- a/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts
+++ b/packages/backend/src/queue/processors/ImportCustomEmojisProcessorService.ts
@@ -87,23 +87,30 @@ export class ImportCustomEmojisProcessorService {
 				await this.emojisRepository.delete({
 					name: emojiInfo.name,
 				});
-				const driveFile = await this.driveService.addFile({
-					user: null,
-					path: emojiPath,
-					name: record.fileName,
-					force: true,
-				});
-				await this.customEmojiService.add({
-					name: emojiInfo.name,
-					category: emojiInfo.category,
-					host: null,
-					aliases: emojiInfo.aliases,
-					driveFile,
-					license: emojiInfo.license,
-					isSensitive: emojiInfo.isSensitive,
-					localOnly: emojiInfo.localOnly,
-					roleIdsThatCanBeUsedThisEmojiAsReaction: [],
-				});
+				try {
+					const driveFile = await this.driveService.addFile({
+						user: null,
+						path: emojiPath,
+						name: record.fileName,
+						force: true,
+					});
+					await this.customEmojiService.add({
+						name: emojiInfo.name,
+						category: emojiInfo.category,
+						host: null,
+						aliases: emojiInfo.aliases,
+						driveFile,
+						license: emojiInfo.license,
+						isSensitive: emojiInfo.isSensitive,
+						localOnly: emojiInfo.localOnly,
+						roleIdsThatCanBeUsedThisEmojiAsReaction: [],
+					});
+				} catch (e) {
+					if (e instanceof Error || typeof e === 'string') {
+						this.logger.error(`couldn't import ${emojiPath} for ${emojiInfo.name}: ${e}`);
+					}
+					continue;
+				}
 			}
 
 			cleanup();
diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index fa7009f8f5..09d51bec72 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -4,11 +4,10 @@
  */
 
 import { URL } from 'node:url';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
 import httpSignature from '@peertube/http-signature';
 import * as Bull from 'bullmq';
 import type Logger from '@/logger.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { FetchInstanceMetadataService } from '@/core/FetchInstanceMetadataService.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
@@ -26,16 +25,28 @@ import { JsonLdService } from '@/core/activitypub/JsonLdService.js';
 import { ApInboxService } from '@/core/activitypub/ApInboxService.js';
 import { bindThis } from '@/decorators.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
+import { CollapsedQueue } from '@/misc/collapsed-queue.js';
+import { MiNote } from '@/models/Note.js';
+import { MiMeta } from '@/models/Meta.js';
+import { DI } from '@/di-symbols.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type { InboxJobData } from '../types.js';
 
+type UpdateInstanceJob = {
+	latestRequestReceivedAt: Date,
+	shouldUnsuspend: boolean,
+};
+
 @Injectable()
-export class InboxProcessorService {
+export class InboxProcessorService implements OnApplicationShutdown {
 	private logger: Logger;
+	private updateInstanceQueue: CollapsedQueue<MiNote['id'], UpdateInstanceJob>;
 
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		private utilityService: UtilityService,
-		private metaService: MetaService,
 		private apInboxService: ApInboxService,
 		private federatedInstanceService: FederatedInstanceService,
 		private fetchInstanceMetadataService: FetchInstanceMetadataService,
@@ -48,6 +59,7 @@ export class InboxProcessorService {
 		private queueLoggerService: QueueLoggerService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('inbox');
+		this.updateInstanceQueue = new CollapsedQueue(60 * 1000 * 5, this.collapseUpdateInstanceJobs, this.performUpdateInstance);
 	}
 
 	@bindThis
@@ -63,9 +75,7 @@ export class InboxProcessorService {
 
 		const host = this.utilityService.toPuny(new URL(signature.keyId).hostname);
 
-		// ブロックしてたら中断
-		const meta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(meta.blockedHosts, host)) {
+		if (!this.utilityService.isFederationAllowedHost(host)) {
 			return `Blocked request: ${host}`;
 		}
 
@@ -164,9 +174,8 @@ export class InboxProcessorService {
 					throw new Bull.UnrecoverableError(`skip: LD-Signature user(${authUser.user.uri}) !== activity.actor(${activity.actor})`);
 				}
 
-				// ブロックしてたら中断
 				const ldHost = this.utilityService.extractDbHost(authUser.user.uri);
-				if (this.utilityService.isBlockedHost(meta.blockedHosts, ldHost)) {
+				if (!this.utilityService.isFederationAllowedHost(ldHost)) {
 					throw new Bull.UnrecoverableError(`Blocked request: ${ldHost}`);
 				}
 			} else {
@@ -185,11 +194,9 @@ export class InboxProcessorService {
 
 		// Update stats
 		this.federatedInstanceService.fetch(authUser.user.host).then(i => {
-			this.federatedInstanceService.update(i.id, {
+			this.updateInstanceQueue.enqueue(i.id, {
 				latestRequestReceivedAt: new Date(),
-				isNotResponding: false,
-				// もしサーバーが死んでるために配信が止まっていた場合には自動的に復活させてあげる
-				suspensionState: i.suspensionState === 'autoSuspendedForNotResponding' ? 'none' : undefined,
+				shouldUnsuspend: i.suspensionState === 'autoSuspendedForNotResponding',
 			});
 
 			this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
@@ -197,7 +204,7 @@ export class InboxProcessorService {
 			this.apRequestChart.inbox();
 			this.federationChart.inbox(i.host);
 
-			if (meta.enableChartsForFederatedInstances) {
+			if (this.meta.enableChartsForFederatedInstances) {
 				this.instanceChart.requestReceived(i.host);
 			}
 		});
@@ -225,4 +232,36 @@ export class InboxProcessorService {
 		}
 		return 'ok';
 	}
+
+	@bindThis
+	public collapseUpdateInstanceJobs(oldJob: UpdateInstanceJob, newJob: UpdateInstanceJob) {
+		const latestRequestReceivedAt = oldJob.latestRequestReceivedAt < newJob.latestRequestReceivedAt
+			? newJob.latestRequestReceivedAt
+			: oldJob.latestRequestReceivedAt;
+		const shouldUnsuspend = oldJob.shouldUnsuspend || newJob.shouldUnsuspend;
+		return {
+			latestRequestReceivedAt,
+			shouldUnsuspend,
+		};
+	}
+
+	@bindThis
+	public async performUpdateInstance(id: string, job: UpdateInstanceJob) {
+		await this.federatedInstanceService.update(id, {
+			latestRequestReceivedAt: new Date(),
+			isNotResponding: false,
+			// もしサーバーが死んでるために配信が止まっていた場合には自動的に復活させてあげる
+			suspensionState: job.shouldUnsuspend ? 'none' : undefined,
+		});
+	}
+
+	@bindThis
+	public async dispose(): Promise<void> {
+		await this.updateInstanceQueue.performAllNow();
+	}
+
+	@bindThis
+	async onApplicationShutdown(signal?: string) {
+		await this.dispose();
+	}
 }
diff --git a/packages/backend/src/server/FileServerService.ts b/packages/backend/src/server/FileServerService.ts
index 77a637d895..41b6d2e83d 100644
--- a/packages/backend/src/server/FileServerService.ts
+++ b/packages/backend/src/server/FileServerService.ts
@@ -82,7 +82,7 @@ export class FileServerService {
 					.catch(err => this.errorHandler(request, reply, err));
 			});
 			fastify.get<{ Params: { key: string; } }>('/files/:key/*', async (request, reply) => {
-				return await reply.redirect(301, `${this.config.url}/files/${request.params.key}`);
+				return await reply.redirect(`${this.config.url}/files/${request.params.key}`, 301);
 			});
 			done();
 		});
@@ -147,12 +147,12 @@ export class FileServerService {
 						url.searchParams.set('static', '1');
 
 						file.cleanup();
-						return await reply.redirect(301, url.toString());
+						return await reply.redirect(url.toString(), 301);
 					} else if (file.mime.startsWith('video/')) {
 						const externalThumbnail = this.videoProcessingService.getExternalVideoThumbnailUrl(file.url);
 						if (externalThumbnail) {
 							file.cleanup();
-							return await reply.redirect(301, externalThumbnail);
+							return await reply.redirect(externalThumbnail, 301);
 						}
 
 						image = await this.videoProcessingService.generateVideoThumbnail(file.path);
@@ -167,7 +167,7 @@ export class FileServerService {
 						url.searchParams.set('url', file.url);
 
 						file.cleanup();
-						return await reply.redirect(301, url.toString());
+						return await reply.redirect(url.toString(), 301);
 					}
 				}
 
@@ -314,8 +314,8 @@ export class FileServerService {
 			}
 
 			return await reply.redirect(
-				301,
 				url.toString(),
+				301,
 			);
 		}
 
diff --git a/packages/backend/src/server/HealthServerService.ts b/packages/backend/src/server/HealthServerService.ts
index 2c3ed85925..5980609f02 100644
--- a/packages/backend/src/server/HealthServerService.ts
+++ b/packages/backend/src/server/HealthServerService.ts
@@ -27,6 +27,9 @@ export class HealthServerService {
 		@Inject(DI.redisForTimelines)
 		private redisForTimelines: Redis.Redis,
 
+		@Inject(DI.redisForReactions)
+		private redisForReactions: Redis.Redis,
+
 		@Inject(DI.db)
 		private db: DataSource,
 
@@ -43,6 +46,7 @@ export class HealthServerService {
 				this.redisForPub.ping(),
 				this.redisForSub.ping(),
 				this.redisForTimelines.ping(),
+				this.redisForReactions.ping(),
 				this.db.query('SELECT 1'),
 				...(this.meilisearch ? [this.meilisearch.health()] : []),
 			]).then(() => 200, () => 503));
diff --git a/packages/backend/src/server/ServerModule.ts b/packages/backend/src/server/ServerModule.ts
index 12d5061985..3ab0b815f2 100644
--- a/packages/backend/src/server/ServerModule.ts
+++ b/packages/backend/src/server/ServerModule.ts
@@ -46,6 +46,7 @@ import { UserListChannelService } from './api/stream/channels/user-list.js';
 import { RoleTimelineChannelService } from './api/stream/channels/role-timeline.js';
 import { ReversiChannelService } from './api/stream/channels/reversi.js';
 import { ReversiGameChannelService } from './api/stream/channels/reversi-game.js';
+import { SigninWithPasskeyApiService } from './api/SigninWithPasskeyApiService.js';
 
 @Module({
 	imports: [
@@ -71,6 +72,7 @@ import { ReversiGameChannelService } from './api/stream/channels/reversi-game.js
 		AuthenticateService,
 		RateLimiterService,
 		SigninApiService,
+		SigninWithPasskeyApiService,
 		SigninService,
 		SignupApiService,
 		StreamingApiServerService,
diff --git a/packages/backend/src/server/ServerService.ts b/packages/backend/src/server/ServerService.ts
index 9c849480f2..fd2bd3267d 100644
--- a/packages/backend/src/server/ServerService.ts
+++ b/packages/backend/src/server/ServerService.ts
@@ -13,7 +13,7 @@ import fastifyRawBody from 'fastify-raw-body';
 import { IsNull } from 'typeorm';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import type { Config } from '@/config.js';
-import type { EmojisRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type { EmojisRepository, MiMeta, UserProfilesRepository, UsersRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
 import type Logger from '@/logger.js';
 import * as Acct from '@/misc/acct.js';
@@ -21,7 +21,6 @@ import { genIdenticon } from '@/misc/gen-identicon.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ActivityPubServerService } from './ActivityPubServerService.js';
 import { NodeinfoServerService } from './NodeinfoServerService.js';
 import { ApiServerService } from './api/ApiServerService.js';
@@ -44,6 +43,9 @@ export class ServerService implements OnApplicationShutdown {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -53,7 +55,6 @@ export class ServerService implements OnApplicationShutdown {
 		@Inject(DI.emojisRepository)
 		private emojisRepository: EmojisRepository,
 
-		private metaService: MetaService,
 		private userEntityService: UserEntityService,
 		private apiServerService: ApiServerService,
 		private openApiServerService: OpenApiServerService,
@@ -165,8 +166,8 @@ export class ServerService implements OnApplicationShutdown {
 			}
 
 			return await reply.redirect(
-				301,
 				url.toString(),
+				301,
 			);
 		});
 
@@ -193,7 +194,7 @@ export class ServerService implements OnApplicationShutdown {
 			reply.header('Content-Type', 'image/png');
 			reply.header('Cache-Control', 'public, max-age=86400');
 
-			if ((await this.metaService.fetch()).enableIdenticonGeneration) {
+			if (this.meta.enableIdenticonGeneration) {
 				return await genIdenticon(request.params.x);
 			} else {
 				return reply.redirect('/static-assets/avatar.png');
diff --git a/packages/backend/src/server/api/ApiCallService.ts b/packages/backend/src/server/api/ApiCallService.ts
index 47f64f6609..aad833f126 100644
--- a/packages/backend/src/server/api/ApiCallService.ts
+++ b/packages/backend/src/server/api/ApiCallService.ts
@@ -13,8 +13,7 @@ import { getIpHash } from '@/misc/get-ip-hash.js';
 import type { MiLocalUser, MiUser } from '@/models/User.js';
 import type { MiAccessToken } from '@/models/AccessToken.js';
 import type Logger from '@/logger.js';
-import type { UserIpsRepository } from '@/models/_.js';
-import { MetaService } from '@/core/MetaService.js';
+import type { MiMeta, UserIpsRepository } from '@/models/_.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { bindThis } from '@/decorators.js';
 import { RoleService } from '@/core/RoleService.js';
@@ -40,13 +39,15 @@ export class ApiCallService implements OnApplicationShutdown {
 	private userIpHistoriesClearIntervalId: NodeJS.Timeout;
 
 	constructor(
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.config)
 		private config: Config,
 
 		@Inject(DI.userIpsRepository)
 		private userIpsRepository: UserIpsRepository,
 
-		private metaService: MetaService,
 		private authenticateService: AuthenticateService,
 		private rateLimiterService: RateLimiterService,
 		private roleService: RoleService,
@@ -64,15 +65,6 @@ export class ApiCallService implements OnApplicationShutdown {
 		let statusCode = err.httpStatusCode;
 		if (err.httpStatusCode === 401) {
 			reply.header('WWW-Authenticate', 'Bearer realm="Misskey"');
-		} else if (err.kind === 'client') {
-			reply.header('WWW-Authenticate', `Bearer realm="Misskey", error="invalid_request", error_description="${err.message}"`);
-			statusCode = statusCode ?? 400;
-		} else if (err.kind === 'permission') {
-			// (ROLE_PERMISSION_DENIEDは関係ない)
-			if (err.code === 'PERMISSION_DENIED') {
-				reply.header('WWW-Authenticate', `Bearer realm="Misskey", error="insufficient_scope", error_description="${err.message}"`);
-			}
-			statusCode = statusCode ?? 403;
 		} else if (err.code === 'RATE_LIMIT_EXCEEDED') {
 			const info: unknown = err.info;
 			const unixEpochInSeconds = Date.now();
@@ -83,6 +75,15 @@ export class ApiCallService implements OnApplicationShutdown {
 			} else {
 				this.logger.warn(`rate limit information has unexpected type ${typeof(err.info?.reset)}`);
 			}
+		} else if (err.kind === 'client') {
+			reply.header('WWW-Authenticate', `Bearer realm="Misskey", error="invalid_request", error_description="${err.message}"`);
+			statusCode = statusCode ?? 400;
+		} else if (err.kind === 'permission') {
+			// (ROLE_PERMISSION_DENIEDは関係ない)
+			if (err.code === 'PERMISSION_DENIED') {
+				reply.header('WWW-Authenticate', `Bearer realm="Misskey", error="insufficient_scope", error_description="${err.message}"`);
+			}
+			statusCode = statusCode ?? 403;
 		} else if (!statusCode) {
 			statusCode = 500;
 		}
@@ -199,9 +200,18 @@ export class ApiCallService implements OnApplicationShutdown {
 			return;
 		}
 
-		const [path] = await createTemp();
+		const [path, cleanup] = await createTemp();
 		await stream.pipeline(multipartData.file, fs.createWriteStream(path));
 
+		// ファイルサイズが制限を超えていた場合
+		// なお truncated はストリームを読み切ってからでないと機能しないため、stream.pipeline より後にある必要がある
+		if (multipartData.file.truncated) {
+			cleanup();
+			reply.code(413);
+			reply.send();
+			return;
+		}
+
 		const fields = {} as Record<string, unknown>;
 		for (const [k, v] of Object.entries(multipartData.fields)) {
 			fields[k] = typeof v === 'object' && 'value' in v ? v.value : undefined;
@@ -256,9 +266,8 @@ export class ApiCallService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	private async logIp(request: FastifyRequest, user: MiLocalUser) {
-		const meta = await this.metaService.fetch();
-		if (!meta.enableIpLogging) return;
+	private logIp(request: FastifyRequest, user: MiLocalUser) {
+		if (!this.meta.enableIpLogging) return;
 		const ip = request.ip;
 		const ips = this.userIpHistories.get(user.id);
 		if (ips == null || !ips.has(ip)) {
diff --git a/packages/backend/src/server/api/ApiServerService.ts b/packages/backend/src/server/api/ApiServerService.ts
index 4a5935f930..709a044601 100644
--- a/packages/backend/src/server/api/ApiServerService.ts
+++ b/packages/backend/src/server/api/ApiServerService.ts
@@ -8,6 +8,7 @@ import cors from '@fastify/cors';
 import multipart from '@fastify/multipart';
 import fastifyCookie from '@fastify/cookie';
 import { ModuleRef } from '@nestjs/core';
+import { AuthenticationResponseJSON } from '@simplewebauthn/types';
 import type { Config } from '@/config.js';
 import type { InstancesRepository, AccessTokensRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
@@ -17,6 +18,7 @@ import endpoints from './endpoints.js';
 import { ApiCallService } from './ApiCallService.js';
 import { SignupApiService } from './SignupApiService.js';
 import { SigninApiService } from './SigninApiService.js';
+import { SigninWithPasskeyApiService } from './SigninWithPasskeyApiService.js';
 import type { FastifyInstance, FastifyPluginOptions } from 'fastify';
 
 @Injectable()
@@ -37,6 +39,7 @@ export class ApiServerService {
 		private apiCallService: ApiCallService,
 		private signupApiService: SignupApiService,
 		private signinApiService: SigninApiService,
+		private signinWithPasskeyApiService: SigninWithPasskeyApiService,
 	) {
 		//this.createServer = this.createServer.bind(this);
 	}
@@ -49,7 +52,7 @@ export class ApiServerService {
 
 		fastify.register(multipart, {
 			limits: {
-				fileSize: this.config.maxFileSize ?? 262144000,
+				fileSize: this.config.maxFileSize,
 				files: 1,
 			},
 		});
@@ -131,6 +134,12 @@ export class ApiServerService {
 			};
 		}>('/signin', (request, reply) => this.signinApiService.signin(request, reply));
 
+		fastify.post<{
+			Body: {
+				credential?: AuthenticationResponseJSON;
+			};
+		}>('/signin-with-passkey', (request, reply) => this.signinWithPasskeyApiService.signin(request, reply));
+
 		fastify.post<{ Body: { code: string; } }>('/signup-pending', (request, reply) => this.signupApiService.signupPending(request, reply));
 
 		fastify.get('/v1/instance/peers', async (request, reply) => {
diff --git a/packages/backend/src/server/api/EndpointsModule.ts b/packages/backend/src/server/api/EndpointsModule.ts
index 41576bedaa..08a0468ab2 100644
--- a/packages/backend/src/server/api/EndpointsModule.ts
+++ b/packages/backend/src/server/api/EndpointsModule.ts
@@ -92,6 +92,7 @@ import * as ep___admin_systemWebhook_delete from './endpoints/admin/system-webho
 import * as ep___admin_systemWebhook_list from './endpoints/admin/system-webhook/list.js';
 import * as ep___admin_systemWebhook_show from './endpoints/admin/system-webhook/show.js';
 import * as ep___admin_systemWebhook_update from './endpoints/admin/system-webhook/update.js';
+import * as ep___admin_systemWebhook_test from './endpoints/admin/system-webhook/test.js';
 import * as ep___announcements from './endpoints/announcements.js';
 import * as ep___announcements_show from './endpoints/announcements/show.js';
 import * as ep___antennas_create from './endpoints/antennas/create.js';
@@ -258,6 +259,7 @@ import * as ep___i_webhooks_show from './endpoints/i/webhooks/show.js';
 import * as ep___i_webhooks_list from './endpoints/i/webhooks/list.js';
 import * as ep___i_webhooks_update from './endpoints/i/webhooks/update.js';
 import * as ep___i_webhooks_delete from './endpoints/i/webhooks/delete.js';
+import * as ep___i_webhooks_test from './endpoints/i/webhooks/test.js';
 import * as ep___invite_create from './endpoints/invite/create.js';
 import * as ep___invite_delete from './endpoints/invite/delete.js';
 import * as ep___invite_list from './endpoints/invite/list.js';
@@ -475,6 +477,7 @@ const $admin_systemWebhook_delete: Provider = { provide: 'ep:admin/system-webhoo
 const $admin_systemWebhook_list: Provider = { provide: 'ep:admin/system-webhook/list', useClass: ep___admin_systemWebhook_list.default };
 const $admin_systemWebhook_show: Provider = { provide: 'ep:admin/system-webhook/show', useClass: ep___admin_systemWebhook_show.default };
 const $admin_systemWebhook_update: Provider = { provide: 'ep:admin/system-webhook/update', useClass: ep___admin_systemWebhook_update.default };
+const $admin_systemWebhook_test: Provider = { provide: 'ep:admin/system-webhook/test', useClass: ep___admin_systemWebhook_test.default };
 const $announcements: Provider = { provide: 'ep:announcements', useClass: ep___announcements.default };
 const $announcements_show: Provider = { provide: 'ep:announcements/show', useClass: ep___announcements_show.default };
 const $antennas_create: Provider = { provide: 'ep:antennas/create', useClass: ep___antennas_create.default };
@@ -641,6 +644,7 @@ const $i_webhooks_list: Provider = { provide: 'ep:i/webhooks/list', useClass: ep
 const $i_webhooks_show: Provider = { provide: 'ep:i/webhooks/show', useClass: ep___i_webhooks_show.default };
 const $i_webhooks_update: Provider = { provide: 'ep:i/webhooks/update', useClass: ep___i_webhooks_update.default };
 const $i_webhooks_delete: Provider = { provide: 'ep:i/webhooks/delete', useClass: ep___i_webhooks_delete.default };
+const $i_webhooks_test: Provider = { provide: 'ep:i/webhooks/test', useClass: ep___i_webhooks_test.default };
 const $invite_create: Provider = { provide: 'ep:invite/create', useClass: ep___invite_create.default };
 const $invite_delete: Provider = { provide: 'ep:invite/delete', useClass: ep___invite_delete.default };
 const $invite_list: Provider = { provide: 'ep:invite/list', useClass: ep___invite_list.default };
@@ -862,6 +866,7 @@ const $reversi_verify: Provider = { provide: 'ep:reversi/verify', useClass: ep__
 		$admin_systemWebhook_list,
 		$admin_systemWebhook_show,
 		$admin_systemWebhook_update,
+		$admin_systemWebhook_test,
 		$announcements,
 		$announcements_show,
 		$antennas_create,
@@ -1028,6 +1033,7 @@ const $reversi_verify: Provider = { provide: 'ep:reversi/verify', useClass: ep__
 		$i_webhooks_show,
 		$i_webhooks_update,
 		$i_webhooks_delete,
+		$i_webhooks_test,
 		$invite_create,
 		$invite_delete,
 		$invite_list,
@@ -1243,6 +1249,7 @@ const $reversi_verify: Provider = { provide: 'ep:reversi/verify', useClass: ep__
 		$admin_systemWebhook_list,
 		$admin_systemWebhook_show,
 		$admin_systemWebhook_update,
+		$admin_systemWebhook_test,
 		$announcements,
 		$announcements_show,
 		$antennas_create,
@@ -1409,6 +1416,7 @@ const $reversi_verify: Provider = { provide: 'ep:reversi/verify', useClass: ep__
 		$i_webhooks_show,
 		$i_webhooks_update,
 		$i_webhooks_delete,
+		$i_webhooks_test,
 		$invite_create,
 		$invite_delete,
 		$invite_list,
diff --git a/packages/backend/src/server/api/SigninWithPasskeyApiService.ts b/packages/backend/src/server/api/SigninWithPasskeyApiService.ts
new file mode 100644
index 0000000000..9ba23c54e2
--- /dev/null
+++ b/packages/backend/src/server/api/SigninWithPasskeyApiService.ts
@@ -0,0 +1,173 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { randomUUID } from 'crypto';
+import { Inject, Injectable } from '@nestjs/common';
+import { IsNull } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import type {
+	SigninsRepository,
+	UserProfilesRepository,
+	UsersRepository,
+} from '@/models/_.js';
+import type { Config } from '@/config.js';
+import { getIpHash } from '@/misc/get-ip-hash.js';
+import type { MiLocalUser, MiUser } from '@/models/User.js';
+import { IdService } from '@/core/IdService.js';
+import { bindThis } from '@/decorators.js';
+import { WebAuthnService } from '@/core/WebAuthnService.js';
+import Logger from '@/logger.js';
+import { LoggerService } from '@/core/LoggerService.js';
+import type { IdentifiableError } from '@/misc/identifiable-error.js';
+import { RateLimiterService } from './RateLimiterService.js';
+import { SigninService } from './SigninService.js';
+import type { AuthenticationResponseJSON } from '@simplewebauthn/types';
+import type { FastifyReply, FastifyRequest } from 'fastify';
+
+@Injectable()
+export class SigninWithPasskeyApiService {
+	private logger: Logger;
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
+		@Inject(DI.userProfilesRepository)
+		private userProfilesRepository: UserProfilesRepository,
+
+		@Inject(DI.signinsRepository)
+		private signinsRepository: SigninsRepository,
+
+		private idService: IdService,
+		private rateLimiterService: RateLimiterService,
+		private signinService: SigninService,
+		private webAuthnService: WebAuthnService,
+		private loggerService: LoggerService,
+	) {
+		this.logger = this.loggerService.getLogger('PasskeyAuth');
+	}
+
+	@bindThis
+	public async signin(
+		request: FastifyRequest<{
+			Body: {
+				credential?: AuthenticationResponseJSON;
+				context?: string;
+			};
+		}>,
+		reply: FastifyReply,
+	) {
+		reply.header('Access-Control-Allow-Origin', this.config.url);
+		reply.header('Access-Control-Allow-Credentials', 'true');
+
+		const body = request.body;
+		const credential = body['credential'];
+
+		function error(status: number, error: { id: string }) {
+			reply.code(status);
+			return { error };
+		}
+
+		const fail = async (userId: MiUser['id'], status?: number, failure?: { id: string }) => {
+			// Append signin history
+			await this.signinsRepository.insert({
+				id: this.idService.gen(),
+				userId: userId,
+				ip: request.ip,
+				headers: request.headers as any,
+				success: false,
+			});
+			return error(status ?? 500, failure ?? { id: '4e30e80c-e338-45a0-8c8f-44455efa3b76' });
+		};
+
+		try {
+			// Not more than 1 API call per 250ms and not more than 100 attempts per 30min
+			// NOTE: 1 Sign-in require 2 API calls
+			await this.rateLimiterService.limit({ key: 'signin-with-passkey', duration: 60 * 30 * 1000, max: 200, minInterval: 250 }, getIpHash(request.ip));
+		} catch (err) {
+			reply.code(429);
+			return {
+				error: {
+					message: 'Too many failed attempts to sign in. Try again later.',
+					code: 'TOO_MANY_AUTHENTICATION_FAILURES',
+					id: '22d05606-fbcf-421a-a2db-b32610dcfd1b',
+				},
+			};
+		}
+
+		// Initiate Passkey Auth challenge with context
+		if (!credential) {
+			const context = randomUUID();
+			this.logger.info(`Initiate Passkey challenge: context: ${context}`);
+			const authChallengeOptions = {
+				option: await this.webAuthnService.initiateSignInWithPasskeyAuthentication(context),
+				context: context,
+			};
+			reply.code(200);
+			return authChallengeOptions;
+		}
+
+		const context = body.context;
+		if (!context || typeof context !== 'string') {
+			// If try Authentication without context
+			return error(400, {
+				id: '1658cc2e-4495-461f-aee4-d403cdf073c1',
+			});
+		}
+
+		this.logger.debug(`Try Sign-in with Passkey: context: ${context}`);
+
+		let authorizedUserId: MiUser['id'] | null;
+		try {
+			authorizedUserId = await this.webAuthnService.verifySignInWithPasskeyAuthentication(context, credential);
+		} catch (err) {
+			this.logger.warn(`Passkey challenge Verify error! : ${err}`);
+			const errorId = (err as IdentifiableError).id;
+			return error(403, {
+				id: errorId,
+			});
+		}
+
+		if (!authorizedUserId) {
+			return error(403, {
+				id: '932c904e-9460-45b7-9ce6-7ed33be7eb2c',
+			});
+		}
+
+		// Fetch user
+		const user = await this.usersRepository.findOneBy({
+			id: authorizedUserId,
+			host: IsNull(),
+		}) as MiLocalUser | null;
+
+		if (user == null) {
+			return error(403, {
+				id: '652f899f-66d4-490e-993e-6606c8ec04c3',
+			});
+		}
+
+		if (user.isSuspended) {
+			return error(403, {
+				id: 'e03a5f46-d309-4865-9b69-56282d94e1eb',
+			});
+		}
+
+		const profile = await this.userProfilesRepository.findOneByOrFail({ userId: user.id });
+
+		// Authentication was successful, but passwordless login is not enabled
+		if (!profile.usePasswordLessLogin) {
+			return await fail(user.id, 403, {
+				id: '2d84773e-f7b7-4d0b-8f72-bb69b584c912',
+			});
+		}
+
+		const signinResponse = this.signinService.signin(request, reply, user);
+		return {
+			signinResponse: signinResponse,
+		};
+	}
+}
diff --git a/packages/backend/src/server/api/SignupApiService.ts b/packages/backend/src/server/api/SignupApiService.ts
index 632b0c62bc..c499638018 100644
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@@ -7,9 +7,8 @@ import { Inject, Injectable } from '@nestjs/common';
 import bcrypt from 'bcryptjs';
 import { IsNull } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { RegistrationTicketsRepository, UsedUsernamesRepository, UserPendingsRepository, UserProfilesRepository, UsersRepository, MiRegistrationTicket } from '@/models/_.js';
+import type { RegistrationTicketsRepository, UsedUsernamesRepository, UserPendingsRepository, UserProfilesRepository, UsersRepository, MiRegistrationTicket, MiMeta } from '@/models/_.js';
 import type { Config } from '@/config.js';
-import { MetaService } from '@/core/MetaService.js';
 import { CaptchaService } from '@/core/CaptchaService.js';
 import { IdService } from '@/core/IdService.js';
 import { SignupService } from '@/core/SignupService.js';
@@ -28,6 +27,9 @@ export class SignupApiService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -45,7 +47,6 @@ export class SignupApiService {
 
 		private userEntityService: UserEntityService,
 		private idService: IdService,
-		private metaService: MetaService,
 		private captchaService: CaptchaService,
 		private signupService: SignupService,
 		private signinService: SigninService,
@@ -72,31 +73,29 @@ export class SignupApiService {
 	) {
 		const body = request.body;
 
-		const instance = await this.metaService.fetch(true);
-
 		// Verify *Captcha
 		// ただしテスト時はこの機構は障害となるため無効にする
 		if (process.env.NODE_ENV !== 'test') {
-			if (instance.enableHcaptcha && instance.hcaptchaSecretKey) {
-				await this.captchaService.verifyHcaptcha(instance.hcaptchaSecretKey, body['hcaptcha-response']).catch(err => {
+			if (this.meta.enableHcaptcha && this.meta.hcaptchaSecretKey) {
+				await this.captchaService.verifyHcaptcha(this.meta.hcaptchaSecretKey, body['hcaptcha-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}
 
-			if (instance.enableMcaptcha && instance.mcaptchaSecretKey && instance.mcaptchaSitekey && instance.mcaptchaInstanceUrl) {
-				await this.captchaService.verifyMcaptcha(instance.mcaptchaSecretKey, instance.mcaptchaSitekey, instance.mcaptchaInstanceUrl, body['m-captcha-response']).catch(err => {
+			if (this.meta.enableMcaptcha && this.meta.mcaptchaSecretKey && this.meta.mcaptchaSitekey && this.meta.mcaptchaInstanceUrl) {
+				await this.captchaService.verifyMcaptcha(this.meta.mcaptchaSecretKey, this.meta.mcaptchaSitekey, this.meta.mcaptchaInstanceUrl, body['m-captcha-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}
 
-			if (instance.enableRecaptcha && instance.recaptchaSecretKey) {
-				await this.captchaService.verifyRecaptcha(instance.recaptchaSecretKey, body['g-recaptcha-response']).catch(err => {
+			if (this.meta.enableRecaptcha && this.meta.recaptchaSecretKey) {
+				await this.captchaService.verifyRecaptcha(this.meta.recaptchaSecretKey, body['g-recaptcha-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}
 
-			if (instance.enableTurnstile && instance.turnstileSecretKey) {
-				await this.captchaService.verifyTurnstile(instance.turnstileSecretKey, body['turnstile-response']).catch(err => {
+			if (this.meta.enableTurnstile && this.meta.turnstileSecretKey) {
+				await this.captchaService.verifyTurnstile(this.meta.turnstileSecretKey, body['turnstile-response']).catch(err => {
 					throw new FastifyReplyError(400, err);
 				});
 			}
@@ -108,7 +107,7 @@ export class SignupApiService {
 		const invitationCode = body['invitationCode'];
 		const emailAddress = body['emailAddress'];
 
-		if (instance.emailRequiredForSignup) {
+		if (this.meta.emailRequiredForSignup) {
 			if (emailAddress == null || typeof emailAddress !== 'string') {
 				reply.code(400);
 				return;
@@ -123,7 +122,7 @@ export class SignupApiService {
 
 		let ticket: MiRegistrationTicket | null = null;
 
-		if (instance.disableRegistration) {
+		if (this.meta.disableRegistration) {
 			if (invitationCode == null || typeof invitationCode !== 'string') {
 				reply.code(400);
 				return;
@@ -144,7 +143,7 @@ export class SignupApiService {
 			}
 
 			// メアド認証が有効の場合
-			if (instance.emailRequiredForSignup) {
+			if (this.meta.emailRequiredForSignup) {
 				// メアド認証済みならエラー
 				if (ticket.usedBy) {
 					reply.code(400);
@@ -162,7 +161,7 @@ export class SignupApiService {
 			}
 		}
 
-		if (instance.emailRequiredForSignup) {
+		if (this.meta.emailRequiredForSignup) {
 			if (await this.usersRepository.exists({ where: { usernameLower: username.toLowerCase(), host: IsNull() } })) {
 				throw new FastifyReplyError(400, 'DUPLICATED_USERNAME');
 			}
@@ -172,7 +171,7 @@ export class SignupApiService {
 				throw new FastifyReplyError(400, 'USED_USERNAME');
 			}
 
-			const isPreserved = instance.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
+			const isPreserved = this.meta.preservedUsernames.map(x => x.toLowerCase()).includes(username.toLowerCase());
 			if (isPreserved) {
 				throw new FastifyReplyError(400, 'DENIED_USERNAME');
 			}
diff --git a/packages/backend/src/server/api/endpoints.ts b/packages/backend/src/server/api/endpoints.ts
index 3dfb7fdad4..2462781f7b 100644
--- a/packages/backend/src/server/api/endpoints.ts
+++ b/packages/backend/src/server/api/endpoints.ts
@@ -98,6 +98,7 @@ import * as ep___admin_systemWebhook_delete from './endpoints/admin/system-webho
 import * as ep___admin_systemWebhook_list from './endpoints/admin/system-webhook/list.js';
 import * as ep___admin_systemWebhook_show from './endpoints/admin/system-webhook/show.js';
 import * as ep___admin_systemWebhook_update from './endpoints/admin/system-webhook/update.js';
+import * as ep___admin_systemWebhook_test from './endpoints/admin/system-webhook/test.js';
 import * as ep___announcements from './endpoints/announcements.js';
 import * as ep___announcements_show from './endpoints/announcements/show.js';
 import * as ep___antennas_create from './endpoints/antennas/create.js';
@@ -264,6 +265,7 @@ import * as ep___i_webhooks_show from './endpoints/i/webhooks/show.js';
 import * as ep___i_webhooks_list from './endpoints/i/webhooks/list.js';
 import * as ep___i_webhooks_update from './endpoints/i/webhooks/update.js';
 import * as ep___i_webhooks_delete from './endpoints/i/webhooks/delete.js';
+import * as ep___i_webhooks_test from './endpoints/i/webhooks/test.js';
 import * as ep___invite_create from './endpoints/invite/create.js';
 import * as ep___invite_delete from './endpoints/invite/delete.js';
 import * as ep___invite_list from './endpoints/invite/list.js';
@@ -479,6 +481,7 @@ const eps = [
 	['admin/system-webhook/list', ep___admin_systemWebhook_list],
 	['admin/system-webhook/show', ep___admin_systemWebhook_show],
 	['admin/system-webhook/update', ep___admin_systemWebhook_update],
+	['admin/system-webhook/test', ep___admin_systemWebhook_test],
 	['announcements', ep___announcements],
 	['announcements/show', ep___announcements_show],
 	['antennas/create', ep___antennas_create],
@@ -645,6 +648,7 @@ const eps = [
 	['i/webhooks/show', ep___i_webhooks_show],
 	['i/webhooks/update', ep___i_webhooks_update],
 	['i/webhooks/delete', ep___i_webhooks_delete],
+	['i/webhooks/test', ep___i_webhooks_test],
 	['invite/create', ep___invite_create],
 	['invite/delete', ep___invite_delete],
 	['invite/list', ep___invite_list],
diff --git a/packages/backend/src/server/api/endpoints/admin/meta.ts b/packages/backend/src/server/api/endpoints/admin/meta.ts
index 2e7f73da73..b76ed5c524 100644
--- a/packages/backend/src/server/api/endpoints/admin/meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/meta.ts
@@ -377,6 +377,10 @@ export const meta = {
 				type: 'number',
 				optional: false, nullable: false,
 			},
+			enableReactionsBuffering: {
+				type: 'boolean',
+				optional: false, nullable: false,
+			},
 			notesPerOneAd: {
 				type: 'number',
 				optional: false, nullable: false,
@@ -491,6 +495,18 @@ export const meta = {
 				type: 'string',
 				optional: false, nullable: true,
 			},
+			federation: {
+				type: 'string',
+				optional: false, nullable: false,
+			},
+			federationHosts: {
+				type: 'array',
+				optional: false, nullable: false,
+				items: {
+					type: 'string',
+					optional: false, nullable: false,
+				},
+			},
 		},
 	},
 } as const;
@@ -617,6 +633,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				perRemoteUserUserTimelineCacheMax: instance.perRemoteUserUserTimelineCacheMax,
 				perUserHomeTimelineCacheMax: instance.perUserHomeTimelineCacheMax,
 				perUserListTimelineCacheMax: instance.perUserListTimelineCacheMax,
+				enableReactionsBuffering: instance.enableReactionsBuffering,
 				notesPerOneAd: instance.notesPerOneAd,
 				summalyProxy: instance.urlPreviewSummaryProxyUrl,
 				urlPreviewEnabled: instance.urlPreviewEnabled,
@@ -625,6 +642,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				urlPreviewRequireContentLength: instance.urlPreviewRequireContentLength,
 				urlPreviewUserAgent: instance.urlPreviewUserAgent,
 				urlPreviewSummaryProxyUrl: instance.urlPreviewSummaryProxyUrl,
+				federation: instance.federation,
+				federationHosts: instance.federationHosts,
 			};
 		});
 	}
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts b/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts
index 7a3410ffa7..f3e440b4cb 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts
@@ -21,16 +21,15 @@ export const meta = {
 		items: {
 			type: 'array',
 			optional: false, nullable: false,
-			items: {
-				anyOf: [
-					{
-						type: 'string',
-					},
-					{
-						type: 'number',
-					},
-				],
-			},
+			prefixItems: [
+				{
+					type: 'string',
+				},
+				{
+					type: 'number',
+				},
+			],
+			unevaluatedItems: false,
 		},
 		example: [[
 			'example.com',
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts b/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts
index 305ae1af1d..e7589cba81 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts
@@ -21,16 +21,15 @@ export const meta = {
 		items: {
 			type: 'array',
 			optional: false, nullable: false,
-			items: {
-				anyOf: [
-					{
-						type: 'string',
-					},
-					{
-						type: 'number',
-					},
-				],
-			},
+			prefixItems: [
+				{
+					type: 'string',
+				},
+				{
+					type: 'number',
+				},
+			],
+			unevaluatedItems: false,
 		},
 		example: [[
 			'example.com',
diff --git a/packages/backend/src/server/api/endpoints/admin/show-user.ts b/packages/backend/src/server/api/endpoints/admin/show-user.ts
index 5a1c05f41a..655bd32bce 100644
--- a/packages/backend/src/server/api/endpoints/admin/show-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/show-user.ts
@@ -31,6 +31,10 @@ export const meta = {
 				type: 'boolean',
 				optional: false, nullable: false,
 			},
+			followedMessage: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 			autoAcceptFollowed: {
 				type: 'boolean',
 				optional: false, nullable: false,
@@ -226,6 +230,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			return {
 				email: profile.email,
 				emailVerified: profile.emailVerified,
+				followedMessage: profile.followedMessage,
 				autoAcceptFollowed: profile.autoAcceptFollowed,
 				noCrawle: profile.noCrawle,
 				preventAiLearning: profile.preventAiLearning,
diff --git a/packages/backend/src/server/api/endpoints/admin/system-webhook/test.ts b/packages/backend/src/server/api/endpoints/admin/system-webhook/test.ts
new file mode 100644
index 0000000000..fb2ddf4b44
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/admin/system-webhook/test.ts
@@ -0,0 +1,77 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Injectable } from '@nestjs/common';
+import ms from 'ms';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { WebhookTestService } from '@/core/WebhookTestService.js';
+import { ApiError } from '@/server/api/error.js';
+import { systemWebhookEventTypes } from '@/models/SystemWebhook.js';
+
+export const meta = {
+	tags: ['webhooks'],
+
+	requireCredential: true,
+	requireModerator: true,
+	secure: true,
+	kind: 'read:admin:system-webhook',
+
+	limit: {
+		duration: ms('15min'),
+		max: 60,
+	},
+
+	errors: {
+		noSuchWebhook: {
+			message: 'No such webhook.',
+			code: 'NO_SUCH_WEBHOOK',
+			id: '0c52149c-e913-18f8-5dc7-74870bfe0cf9',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		webhookId: {
+			type: 'string',
+			format: 'misskey:id',
+		},
+		type: {
+			type: 'string',
+			enum: systemWebhookEventTypes,
+		},
+		override: {
+			type: 'object',
+			properties: {
+				url: { type: 'string', nullable: false },
+				secret: { type: 'string', nullable: false },
+			},
+		},
+	},
+	required: ['webhookId', 'type'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private webhookTestService: WebhookTestService,
+	) {
+		super(meta, paramDef, async (ps) => {
+			try {
+				await this.webhookTestService.testSystemWebhook({
+					webhookId: ps.webhookId,
+					type: ps.type,
+					override: ps.override,
+				});
+			} catch (e) {
+				if (e instanceof WebhookTestService.NoSuchWebhookError) {
+					throw new ApiError(meta.errors.noSuchWebhook);
+				}
+				throw e;
+			}
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/admin/update-meta.ts b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
index 5efdc9d8c4..daef236397 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -142,6 +142,7 @@ export const paramDef = {
 		perRemoteUserUserTimelineCacheMax: { type: 'integer' },
 		perUserHomeTimelineCacheMax: { type: 'integer' },
 		perUserListTimelineCacheMax: { type: 'integer' },
+		enableReactionsBuffering: { type: 'boolean' },
 		notesPerOneAd: { type: 'integer' },
 		silencedHosts: {
 			type: 'array',
@@ -167,6 +168,16 @@ export const paramDef = {
 		urlPreviewRequireContentLength: { type: 'boolean' },
 		urlPreviewUserAgent: { type: 'string', nullable: true },
 		urlPreviewSummaryProxyUrl: { type: 'string', nullable: true },
+		federation: {
+			type: 'string',
+			enum: ['all', 'none', 'specified'],
+		},
+		federationHosts: {
+			type: 'array',
+			items: {
+				type: 'string',
+			},
+		},
 	},
 	required: [],
 } as const;
@@ -598,6 +609,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.perUserListTimelineCacheMax = ps.perUserListTimelineCacheMax;
 			}
 
+			if (ps.enableReactionsBuffering !== undefined) {
+				set.enableReactionsBuffering = ps.enableReactionsBuffering;
+			}
+
 			if (ps.notesPerOneAd !== undefined) {
 				set.notesPerOneAd = ps.notesPerOneAd;
 			}
@@ -632,6 +647,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.urlPreviewSummaryProxyUrl = value === '' ? null : value;
 			}
 
+			if (ps.federation !== undefined) {
+				set.federation = ps.federation;
+			}
+
+			if (Array.isArray(ps.federationHosts)) {
+				set.blockedHosts = ps.federationHosts.filter(Boolean).map(x => x.toLowerCase());
+			}
+
 			const before = await this.metaService.fetch(true);
 
 			await this.metaService.update(set);
diff --git a/packages/backend/src/server/api/endpoints/antennas/create.ts b/packages/backend/src/server/api/endpoints/antennas/create.ts
index 577b9e1b1f..e0c8ddcc84 100644
--- a/packages/backend/src/server/api/endpoints/antennas/create.ts
+++ b/packages/backend/src/server/api/endpoints/antennas/create.ts
@@ -34,6 +34,12 @@ export const meta = {
 			code: 'TOO_MANY_ANTENNAS',
 			id: 'faf47050-e8b5-438c-913c-db2b1576fde4',
 		},
+
+		emptyKeyword: {
+			message: 'Either keywords or excludeKeywords is required.',
+			code: 'EMPTY_KEYWORD',
+			id: '53ee222e-1ddd-4f9a-92e5-9fb82ddb463a',
+		},
 	},
 
 	res: {
@@ -87,7 +93,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			if (ps.keywords.flat().every(x => x === '') && ps.excludeKeywords.flat().every(x => x === '')) {
-				throw new Error('either keywords or excludeKeywords is required.');
+				throw new ApiError(meta.errors.emptyKeyword);
 			}
 
 			const currentAntennasCount = await this.antennasRepository.countBy({
diff --git a/packages/backend/src/server/api/endpoints/antennas/update.ts b/packages/backend/src/server/api/endpoints/antennas/update.ts
index 0c30bca9e0..10f26b1912 100644
--- a/packages/backend/src/server/api/endpoints/antennas/update.ts
+++ b/packages/backend/src/server/api/endpoints/antennas/update.ts
@@ -32,6 +32,12 @@ export const meta = {
 			code: 'NO_SUCH_USER_LIST',
 			id: '1c6b35c9-943e-48c2-81e4-2844989407f7',
 		},
+
+		emptyKeyword: {
+			message: 'Either keywords or excludeKeywords is required.',
+			code: 'EMPTY_KEYWORD',
+			id: '721aaff6-4e1b-4d88-8de6-877fae9f68c4',
+		},
 	},
 
 	res: {
@@ -85,7 +91,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		super(meta, paramDef, async (ps, me) => {
 			if (ps.keywords && ps.excludeKeywords) {
 				if (ps.keywords.flat().every(x => x === '') && ps.excludeKeywords.flat().every(x => x === '')) {
-					throw new Error('either keywords or excludeKeywords is required.');
+					throw new ApiError(meta.errors.emptyKeyword);
 				}
 			}
 			// Fetch the antenna
diff --git a/packages/backend/src/server/api/endpoints/ap/show.ts b/packages/backend/src/server/api/endpoints/ap/show.ts
index d3c40dba59..c52608cefb 100644
--- a/packages/backend/src/server/api/endpoints/ap/show.ts
+++ b/packages/backend/src/server/api/endpoints/ap/show.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import ms from 'ms';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { MiNote } from '@/models/Note.js';
@@ -12,7 +12,6 @@ import { isActor, isPost, getApId } from '@/core/activitypub/type.js';
 import type { SchemaType } from '@/misc/json-schema.js';
 import { ApResolverService } from '@/core/activitypub/ApResolverService.js';
 import { ApDbResolverService } from '@/core/activitypub/ApDbResolverService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
 import { ApNoteService } from '@/core/activitypub/models/ApNoteService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
@@ -91,7 +90,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private utilityService: UtilityService,
 		private userEntityService: UserEntityService,
 		private noteEntityService: NoteEntityService,
-		private metaService: MetaService,
 		private apResolverService: ApResolverService,
 		private apDbResolverService: ApDbResolverService,
 		private apPersonService: ApPersonService,
@@ -112,9 +110,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 	 */
 	@bindThis
 	private async fetchAny(uri: string, me: MiLocalUser | null | undefined): Promise<SchemaType<typeof meta['res']> | null> {
-	// ブロックしてたら中断
-		const fetchedMeta = await this.metaService.fetch();
-		if (this.utilityService.isBlockedHost(fetchedMeta.blockedHosts, this.utilityService.extractDbHost(uri))) return null;
+		if (!this.utilityService.isFederationAllowedUri(uri)) return null;
 
 		let local = await this.mergePack(me, ...await Promise.all([
 			this.apDbResolverService.getUserFromApId(uri),
diff --git a/packages/backend/src/server/api/endpoints/channels/timeline.ts b/packages/backend/src/server/api/endpoints/channels/timeline.ts
index 8c55673590..d4fd75e049 100644
--- a/packages/backend/src/server/api/endpoints/channels/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/channels/timeline.ts
@@ -5,14 +5,12 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import type { ChannelsRepository, NotesRepository } from '@/models/_.js';
+import type { ChannelsRepository, MiMeta, NotesRepository } from '@/models/_.js';
 import { QueryService } from '@/core/QueryService.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
 import { IdService } from '@/core/IdService.js';
-import { CacheService } from '@/core/CacheService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { ApiError } from '../../error.js';
@@ -58,6 +56,9 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -68,16 +69,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private noteEntityService: NoteEntityService,
 		private queryService: QueryService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
-		private cacheService: CacheService,
 		private activeUsersChart: ActiveUsersChart,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
 			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.gen(ps.sinceDate!) : null);
 
-			const serverSettings = await this.metaService.fetch();
-
 			const channel = await this.channelsRepository.findOneBy({
 				id: ps.channelId,
 			});
@@ -88,7 +85,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			if (me) this.activeUsersChart.read(me);
 
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				return await this.noteEntityService.packMany(await this.getFromDb({ untilId, sinceId, limit: ps.limit, channelId: channel.id }, me), me);
 			}
 
diff --git a/packages/backend/src/server/api/endpoints/drive.ts b/packages/backend/src/server/api/endpoints/drive.ts
index 7e9b0fa0e1..eb45e29f9e 100644
--- a/packages/backend/src/server/api/endpoints/drive.ts
+++ b/packages/backend/src/server/api/endpoints/drive.ts
@@ -5,7 +5,6 @@
 
 import { Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import { RoleService } from '@/core/RoleService.js';
 
@@ -41,14 +40,10 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
-		private metaService: MetaService,
 		private driveFileEntityService: DriveFileEntityService,
 		private roleService: RoleService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const instance = await this.metaService.fetch(true);
-
-			// Calculate drive usage
 			const usage = await this.driveFileEntityService.calcDriveUsageOf(me.id);
 
 			const policies = await this.roleService.getUserPolicies(me.id);
diff --git a/packages/backend/src/server/api/endpoints/drive/files/attached-notes.ts b/packages/backend/src/server/api/endpoints/drive/files/attached-notes.ts
index 4670392025..b86059b5e7 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/attached-notes.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/attached-notes.ts
@@ -10,6 +10,7 @@ import { QueryService } from '@/core/QueryService.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { DI } from '@/di-symbols.js';
 import { ApiError } from '../../../error.js';
+import { RoleService } from '@/core/RoleService.js';
 
 export const meta = {
 	tags: ['drive', 'notes'],
@@ -61,12 +62,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 		private noteEntityService: NoteEntityService,
 		private queryService: QueryService,
+		private roleService: RoleService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			// Fetch file
 			const file = await this.driveFilesRepository.findOneBy({
 				id: ps.fileId,
-				userId: me.id,
+				userId: await this.roleService.isModerator(me) ? undefined : me.id,
 			});
 
 			if (file == null) {
diff --git a/packages/backend/src/server/api/endpoints/drive/files/create.ts b/packages/backend/src/server/api/endpoints/drive/files/create.ts
index 9c17f93ab2..74eb4dded7 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/create.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/create.ts
@@ -4,14 +4,15 @@
  */
 
 import ms from 'ms';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { DB_MAX_IMAGE_COMMENT_LENGTH } from '@/const.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DriveService } from '@/core/DriveService.js';
 import { ApiError } from '../../../error.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
 
 export const meta = {
 	tags: ['drive'],
@@ -73,8 +74,10 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		private driveFileEntityService: DriveFileEntityService,
-		private metaService: MetaService,
 		private driveService: DriveService,
 	) {
 		super(meta, paramDef, async (ps, me, _, file, cleanup, ip, headers) => {
@@ -91,8 +94,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				}
 			}
 
-			const instance = await this.metaService.fetch();
-
 			try {
 				// Create file
 				const driveFile = await this.driveService.addFile({
@@ -103,8 +104,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					folderId: ps.folderId,
 					force: ps.force,
 					sensitive: ps.isSensitive,
-					requestIp: instance.enableIpLogging ? ip : null,
-					requestHeaders: instance.enableIpLogging ? headers : null,
+					requestIp: this.serverSettings.enableIpLogging ? ip : null,
+					requestHeaders: this.serverSettings.enableIpLogging ? headers : null,
 				});
 				return await this.driveFileEntityService.pack(driveFile, { self: true });
 			} catch (err) {
diff --git a/packages/backend/src/server/api/endpoints/i/import-antennas.ts b/packages/backend/src/server/api/endpoints/i/import-antennas.ts
index bc46163e3d..bdf6c065e8 100644
--- a/packages/backend/src/server/api/endpoints/i/import-antennas.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-antennas.ts
@@ -16,6 +16,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportAntennas',
 	prohibitMoved: true,
 
 	limit: {
diff --git a/packages/backend/src/server/api/endpoints/i/import-blocking.ts b/packages/backend/src/server/api/endpoints/i/import-blocking.ts
index 2606108539..d7bb6bcd22 100644
--- a/packages/backend/src/server/api/endpoints/i/import-blocking.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-blocking.ts
@@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportBlocking',
 	prohibitMoved: true,
 
 	limit: {
diff --git a/packages/backend/src/server/api/endpoints/i/import-following.ts b/packages/backend/src/server/api/endpoints/i/import-following.ts
index d5e824df27..e03192d8c6 100644
--- a/packages/backend/src/server/api/endpoints/i/import-following.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-following.ts
@@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportFollowing',
 	prohibitMoved: true,
 	limit: {
 		duration: ms('1hour'),
diff --git a/packages/backend/src/server/api/endpoints/i/import-muting.ts b/packages/backend/src/server/api/endpoints/i/import-muting.ts
index 0f5800404e..76b285bb7e 100644
--- a/packages/backend/src/server/api/endpoints/i/import-muting.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-muting.ts
@@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportMuting',
 	prohibitMoved: true,
 
 	limit: {
diff --git a/packages/backend/src/server/api/endpoints/i/import-user-lists.ts b/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
index bacdd5c88f..76ecfd082c 100644
--- a/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-user-lists.ts
@@ -15,6 +15,7 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	secure: true,
 	requireCredential: true,
+	requireRolePolicy: 'canImportUserLists',
 	prohibitMoved: true,
 	limit: {
 		duration: ms('1hour'),
diff --git a/packages/backend/src/server/api/endpoints/i/update-email.ts b/packages/backend/src/server/api/endpoints/i/update-email.ts
index eea657ebbd..da1faee30d 100644
--- a/packages/backend/src/server/api/endpoints/i/update-email.ts
+++ b/packages/backend/src/server/api/endpoints/i/update-email.ts
@@ -7,7 +7,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import ms from 'ms';
 import bcrypt from 'bcryptjs';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import type { UserProfilesRepository } from '@/models/_.js';
+import type { MiMeta, UserProfilesRepository } from '@/models/_.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { EmailService } from '@/core/EmailService.js';
 import type { Config } from '@/config.js';
@@ -15,7 +15,6 @@ import { DI } from '@/di-symbols.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { L_CHARS, secureRndstr } from '@/misc/secure-rndstr.js';
 import { UserAuthService } from '@/core/UserAuthService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { ApiError } from '../../error.js';
 
 export const meta = {
@@ -70,10 +69,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.userProfilesRepository)
 		private userProfilesRepository: UserProfilesRepository,
 
-		private metaService: MetaService,
 		private userEntityService: UserEntityService,
 		private emailService: EmailService,
 		private userAuthService: UserAuthService,
@@ -105,7 +106,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				if (!res.available) {
 					throw new ApiError(meta.errors.unavailable);
 				}
-			} else if ((await this.metaService.fetch()).emailRequiredForSignup) {
+			} else if (this.serverSettings.emailRequiredForSignup) {
 				throw new ApiError(meta.errors.emailRequired);
 			}
 
diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index a1e2fa5e4c..798bd98cf1 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -13,9 +13,8 @@ import { extractHashtags } from '@/misc/extract-hashtags.js';
 import * as Acct from '@/misc/acct.js';
 import type { UsersRepository, DriveFilesRepository, UserProfilesRepository, PagesRepository } from '@/models/_.js';
 import type { MiLocalUser, MiUser } from '@/models/User.js';
-import { birthdaySchema, descriptionSchema, locationSchema, nameSchema } from '@/models/User.js';
+import { birthdaySchema, descriptionSchema, followedMessageSchema, locationSchema, nameSchema } from '@/models/User.js';
 import type { MiUserProfile } from '@/models/UserProfile.js';
-import { notificationTypes } from '@/types.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import { langmap } from '@/misc/langmap.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
@@ -134,6 +133,7 @@ export const paramDef = {
 	properties: {
 		name: { ...nameSchema, nullable: true },
 		description: { ...descriptionSchema, nullable: true },
+		followedMessage: { ...followedMessageSchema, nullable: true },
 		location: { ...locationSchema, nullable: true },
 		birthday: { ...birthdaySchema, nullable: true },
 		lang: { type: 'string', enum: [null, ...Object.keys(langmap)] as string[], nullable: true },
@@ -267,6 +267,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				}
 			}
 			if (ps.description !== undefined) profileUpdates.description = ps.description;
+			if (ps.followedMessage !== undefined) profileUpdates.followedMessage = ps.followedMessage;
 			if (ps.lang !== undefined) profileUpdates.lang = ps.lang;
 			if (ps.location !== undefined) profileUpdates.location = ps.location;
 			if (ps.birthday !== undefined) profileUpdates.birthday = ps.birthday;
diff --git a/packages/backend/src/server/api/endpoints/i/webhooks/create.ts b/packages/backend/src/server/api/endpoints/i/webhooks/create.ts
index 9eb7f5b3a0..6e84603f7a 100644
--- a/packages/backend/src/server/api/endpoints/i/webhooks/create.ts
+++ b/packages/backend/src/server/api/endpoints/i/webhooks/create.ts
@@ -13,6 +13,7 @@ import { DI } from '@/di-symbols.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ApiError } from '@/server/api/error.js';
 
+// TODO: UserWebhook schemaの適用
 export const meta = {
 	tags: ['webhooks'],
 
diff --git a/packages/backend/src/server/api/endpoints/i/webhooks/list.ts b/packages/backend/src/server/api/endpoints/i/webhooks/list.ts
index fe07afb2d0..394c178f2a 100644
--- a/packages/backend/src/server/api/endpoints/i/webhooks/list.ts
+++ b/packages/backend/src/server/api/endpoints/i/webhooks/list.ts
@@ -9,6 +9,7 @@ import { webhookEventTypes } from '@/models/Webhook.js';
 import type { WebhooksRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
 
+// TODO: UserWebhook schemaの適用
 export const meta = {
 	tags: ['webhooks', 'account'],
 
diff --git a/packages/backend/src/server/api/endpoints/i/webhooks/show.ts b/packages/backend/src/server/api/endpoints/i/webhooks/show.ts
index 5ddb79caf2..4a0c09ff0c 100644
--- a/packages/backend/src/server/api/endpoints/i/webhooks/show.ts
+++ b/packages/backend/src/server/api/endpoints/i/webhooks/show.ts
@@ -10,6 +10,7 @@ import type { WebhooksRepository } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
 import { ApiError } from '../../../error.js';
 
+// TODO: UserWebhook schemaの適用
 export const meta = {
 	tags: ['webhooks'],
 
diff --git a/packages/backend/src/server/api/endpoints/i/webhooks/test.ts b/packages/backend/src/server/api/endpoints/i/webhooks/test.ts
new file mode 100644
index 0000000000..2bf6df9ce2
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/i/webhooks/test.ts
@@ -0,0 +1,76 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Injectable } from '@nestjs/common';
+import ms from 'ms';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { webhookEventTypes } from '@/models/Webhook.js';
+import { WebhookTestService } from '@/core/WebhookTestService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['webhooks'],
+
+	requireCredential: true,
+	secure: true,
+	kind: 'read:account',
+
+	limit: {
+		duration: ms('15min'),
+		max: 60,
+	},
+
+	errors: {
+		noSuchWebhook: {
+			message: 'No such webhook.',
+			code: 'NO_SUCH_WEBHOOK',
+			id: '0c52149c-e913-18f8-5dc7-74870bfe0cf9',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		webhookId: {
+			type: 'string',
+			format: 'misskey:id',
+		},
+		type: {
+			type: 'string',
+			enum: webhookEventTypes,
+		},
+		override: {
+			type: 'object',
+			properties: {
+				url: { type: 'string' },
+				secret: { type: 'string' },
+			},
+		},
+	},
+	required: ['webhookId', 'type'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private webhookTestService: WebhookTestService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			try {
+				await this.webhookTestService.testUserWebhook({
+					webhookId: ps.webhookId,
+					type: ps.type,
+					override: ps.override,
+				}, me);
+			} catch (e) {
+				if (e instanceof WebhookTestService.NoSuchWebhookError) {
+					throw new ApiError(meta.errors.noSuchWebhook);
+				}
+				throw e;
+			}
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index beb77ca7ab..253a360815 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -17,8 +17,6 @@ import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { NoteCreateService } from '@/core/NoteCreateService.js';
 import { DI } from '@/di-symbols.js';
 import { isQuote, isRenote } from '@/misc/is-renote.js';
-import { MetaService } from '@/core/MetaService.js';
-import { UtilityService } from '@/core/UtilityService.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { ApiError } from '../../error.js';
 
diff --git a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
index 2a2c659942..aed9065bf9 100644
--- a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -5,7 +5,7 @@
 
 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository, ChannelFollowingsRepository } from '@/models/_.js';
+import type { NotesRepository, ChannelFollowingsRepository, MiMeta } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
@@ -16,7 +16,6 @@ import { CacheService } from '@/core/CacheService.js';
 import { FanoutTimelineName } from '@/core/FanoutTimelineService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { ApiError } from '../../error.js';
@@ -74,6 +73,9 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -87,7 +89,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private cacheService: CacheService,
 		private queryService: QueryService,
 		private userFollowingService: UserFollowingService,
-		private metaService: MetaService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
@@ -101,9 +102,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			if (ps.withReplies && ps.withFiles) throw new ApiError(meta.errors.bothWithRepliesAndWithFiles);
 
-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
@@ -156,7 +155,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				allowPartial: ps.allowPartial,
 				me,
 				redisTimelines: timelineConfig,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				alwaysIncludeMyNotes: true,
 				excludePureRenotes: !ps.withRenotes,
 				noteFilter: note => {
diff --git a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
index be82b5a8a7..0b48f2c78b 100644
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@@ -5,16 +5,14 @@
 
 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository } from '@/models/_.js';
+import type { MiMeta, NotesRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
 import { RoleService } from '@/core/RoleService.js';
 import { IdService } from '@/core/IdService.js';
-import { CacheService } from '@/core/CacheService.js';
 import { QueryService } from '@/core/QueryService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { ApiError } from '../../error.js';
@@ -66,6 +64,9 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -73,10 +74,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private roleService: RoleService,
 		private activeUsersChart: ActiveUsersChart,
 		private idService: IdService,
-		private cacheService: CacheService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private queryService: QueryService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -89,9 +88,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			if (ps.withReplies && ps.withFiles) throw new ApiError(meta.errors.bothWithRepliesAndWithFiles);
 
-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
@@ -115,7 +112,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				limit: ps.limit,
 				allowPartial: ps.allowPartial,
 				me,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines:
 					ps.withFiles ? ['localTimelineWithFiles']
 					: ps.withReplies ? ['localTimeline', 'localTimelineWithReplies']
diff --git a/packages/backend/src/server/api/endpoints/notes/timeline.ts b/packages/backend/src/server/api/endpoints/notes/timeline.ts
index c9b43b5359..7cb11cc1eb 100644
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@@ -5,7 +5,7 @@
 
 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository, ChannelFollowingsRepository } from '@/models/_.js';
+import type { NotesRepository, ChannelFollowingsRepository, MiMeta } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { QueryService } from '@/core/QueryService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
@@ -15,7 +15,6 @@ import { IdService } from '@/core/IdService.js';
 import { CacheService } from '@/core/CacheService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
 import { MiLocalUser } from '@/models/User.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 
 export const meta = {
@@ -56,6 +55,9 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -69,15 +71,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private userFollowingService: UserFollowingService,
 		private queryService: QueryService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
 			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.gen(ps.sinceDate!) : null);
 
-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
@@ -108,7 +107,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				limit: ps.limit,
 				allowPartial: ps.allowPartial,
 				me,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? [`homeTimelineWithFiles:${me.id}`] : [`homeTimeline:${me.id}`],
 				alwaysIncludeMyNotes: true,
 				excludePureRenotes: !ps.withRenotes,
diff --git a/packages/backend/src/server/api/endpoints/notes/translate.ts b/packages/backend/src/server/api/endpoints/notes/translate.ts
index 38a9660aa2..e9a6a36b02 100644
--- a/packages/backend/src/server/api/endpoints/notes/translate.ts
+++ b/packages/backend/src/server/api/endpoints/notes/translate.ts
@@ -4,14 +4,15 @@
  */
 
 import { URLSearchParams } from 'node:url';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { GetterService } from '@/server/api/GetterService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ApiError } from '../../error.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
 
 export const meta = {
 	tags: ['notes'],
@@ -59,9 +60,11 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		private noteEntityService: NoteEntityService,
 		private getterService: GetterService,
-		private metaService: MetaService,
 		private httpRequestService: HttpRequestService,
 		private roleService: RoleService,
 	) {
@@ -84,9 +87,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				return;
 			}
 
-			const instance = await this.metaService.fetch();
-
-			if (instance.deeplAuthKey == null) {
+			if (this.serverSettings.deeplAuthKey == null) {
 				throw new ApiError(meta.errors.unavailable);
 			}
 
@@ -94,11 +95,11 @@ 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', instance.deeplAuthKey);
+			params.append('auth_key', this.serverSettings.deeplAuthKey);
 			params.append('text', note.text);
 			params.append('target_lang', targetLang);
 
-			const endpoint = instance.deeplIsPro ? 'https://api.deepl.com/v2/translate' : 'https://api-free.deepl.com/v2/translate';
+			const endpoint = this.serverSettings.deeplIsPro ? 'https://api.deepl.com/v2/translate' : 'https://api-free.deepl.com/v2/translate';
 
 			const res = await this.httpRequestService.send(endpoint, {
 				method: 'POST',
diff --git a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
index 43877e61ef..6c7185c9eb 100644
--- a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
@@ -5,16 +5,14 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { Brackets } from 'typeorm';
-import type { MiUserList, NotesRepository, UserListMembershipsRepository, UserListsRepository } from '@/models/_.js';
+import type { MiMeta, MiUserList, NotesRepository, UserListMembershipsRepository, UserListsRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
-import { CacheService } from '@/core/CacheService.js';
 import { IdService } from '@/core/IdService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { MiLocalUser } from '@/models/User.js';
-import { MetaService } from '@/core/MetaService.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { ApiError } from '../../error.js';
 
@@ -69,6 +67,9 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -80,11 +81,9 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 		private noteEntityService: NoteEntityService,
 		private activeUsersChart: ActiveUsersChart,
-		private cacheService: CacheService,
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
 		private queryService: QueryService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
@@ -99,9 +98,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				throw new ApiError(meta.errors.noSuchList);
 			}
 
-			const serverSettings = await this.metaService.fetch();
-
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb(list, {
 					untilId,
 					sinceId,
@@ -124,7 +121,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				limit: ps.limit,
 				allowPartial: ps.allowPartial,
 				me,
-				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
+				useDbFallback: this.serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? [`userListTimelineWithFiles:${list.id}`] : [`userListTimeline:${list.id}`],
 				alwaysIncludeMyNotes: true,
 				excludePureRenotes: !ps.withRenotes,
diff --git a/packages/backend/src/server/api/endpoints/pinned-users.ts b/packages/backend/src/server/api/endpoints/pinned-users.ts
index 15832ef7f8..5b0b656c63 100644
--- a/packages/backend/src/server/api/endpoints/pinned-users.ts
+++ b/packages/backend/src/server/api/endpoints/pinned-users.ts
@@ -5,11 +5,10 @@
 
 import { IsNull } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsersRepository } from '@/models/_.js';
 import * as Acct from '@/misc/acct.js';
 import type { MiUser } from '@/models/User.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { DI } from '@/di-symbols.js';
 
@@ -38,16 +37,16 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
-		private metaService: MetaService,
 		private userEntityService: UserEntityService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const meta = await this.metaService.fetch();
-
-			const users = await Promise.all(meta.pinnedUsers.map(acct => Acct.parse(acct)).map(acct => this.usersRepository.findOneBy({
+			const users = await Promise.all(this.serverSettings.pinnedUsers.map(acct => Acct.parse(acct)).map(acct => this.usersRepository.findOneBy({
 				usernameLower: acct.username.toLowerCase(),
 				host: acct.host ?? IsNull(),
 			})));
diff --git a/packages/backend/src/server/api/endpoints/server-info.ts b/packages/backend/src/server/api/endpoints/server-info.ts
index c13802eb06..8301c85f2e 100644
--- a/packages/backend/src/server/api/endpoints/server-info.ts
+++ b/packages/backend/src/server/api/endpoints/server-info.ts
@@ -5,9 +5,10 @@
 
 import * as os from 'node:os';
 import si from 'systeminformation';
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
+import { MiMeta } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
 
 export const meta = {
 	requireCredential: false,
@@ -73,10 +74,11 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
 	) {
 		super(meta, paramDef, async () => {
-			if (!(await this.metaService.fetch()).enableServerMachineStats) return {
+			if (!this.serverSettings.enableServerMachineStats) return {
 				machine: '?',
 				cpu: {
 					model: '?',
diff --git a/packages/backend/src/server/api/endpoints/sw/register.ts b/packages/backend/src/server/api/endpoints/sw/register.ts
index a9a33149f9..fd76df2d3c 100644
--- a/packages/backend/src/server/api/endpoints/sw/register.ts
+++ b/packages/backend/src/server/api/endpoints/sw/register.ts
@@ -5,9 +5,8 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { IdService } from '@/core/IdService.js';
-import type { SwSubscriptionsRepository } from '@/models/_.js';
+import type { MiMeta, SwSubscriptionsRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { MetaService } from '@/core/MetaService.js';
 import { DI } from '@/di-symbols.js';
 import { PushNotificationService } from '@/core/PushNotificationService.js';
 
@@ -62,11 +61,13 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.swSubscriptionsRepository)
 		private swSubscriptionsRepository: SwSubscriptionsRepository,
 
 		private idService: IdService,
-		private metaService: MetaService,
 		private pushNotificationService: PushNotificationService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
@@ -78,12 +79,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				publickey: ps.publickey,
 			});
 
-			const instance = await this.metaService.fetch(true);
-
 			if (exist != null) {
 				return {
 					state: 'already-subscribed' as const,
-					key: instance.swPublicKey,
+					key: this.serverSettings.swPublicKey,
 					userId: me.id,
 					endpoint: exist.endpoint,
 					sendReadMessage: exist.sendReadMessage,
@@ -103,7 +102,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			return {
 				state: 'subscribed' as const,
-				key: instance.swPublicKey,
+				key: this.serverSettings.swPublicKey,
 				userId: me.id,
 				endpoint: ps.endpoint,
 				sendReadMessage: ps.sendReadMessage,
diff --git a/packages/backend/src/server/api/endpoints/username/available.ts b/packages/backend/src/server/api/endpoints/username/available.ts
index affb0996f1..4944be9b05 100644
--- a/packages/backend/src/server/api/endpoints/username/available.ts
+++ b/packages/backend/src/server/api/endpoints/username/available.ts
@@ -5,11 +5,10 @@
 
 import { IsNull } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
+import type { MiMeta, UsedUsernamesRepository, UsersRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { localUsernameSchema } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
-import { MetaService } from '@/core/MetaService.js';
 
 export const meta = {
 	tags: ['users'],
@@ -39,13 +38,14 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
 		@Inject(DI.usedUsernamesRepository)
 		private usedUsernamesRepository: UsedUsernamesRepository,
-
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const exist = await this.usersRepository.countBy({
@@ -55,8 +55,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			const exist2 = await this.usedUsernamesRepository.countBy({ username: ps.username.toLowerCase() });
 
-			const meta = await this.metaService.fetch();
-			const isPreserved = meta.preservedUsernames.map(x => x.toLowerCase()).includes(ps.username.toLowerCase());
+			const isPreserved = this.serverSettings.preservedUsernames.map(x => x.toLowerCase()).includes(ps.username.toLowerCase());
 
 			return {
 				available: exist === 0 && exist2 === 0 && !isPreserved,
diff --git a/packages/backend/src/server/api/endpoints/users/notes.ts b/packages/backend/src/server/api/endpoints/users/notes.ts
index cc76c12f1d..7fc11ba369 100644
--- a/packages/backend/src/server/api/endpoints/users/notes.ts
+++ b/packages/backend/src/server/api/endpoints/users/notes.ts
@@ -5,14 +5,13 @@
 
 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository } from '@/models/_.js';
+import type { MiMeta, NotesRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { DI } from '@/di-symbols.js';
 import { CacheService } from '@/core/CacheService.js';
 import { IdService } from '@/core/IdService.js';
 import { QueryService } from '@/core/QueryService.js';
-import { MetaService } from '@/core/MetaService.js';
 import { MiLocalUser } from '@/models/User.js';
 import { FanoutTimelineEndpointService } from '@/core/FanoutTimelineEndpointService.js';
 import { FanoutTimelineName } from '@/core/FanoutTimelineService.js';
@@ -67,6 +66,9 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
+		@Inject(DI.meta)
+		private serverSettings: MiMeta,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -75,15 +77,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private cacheService: CacheService,
 		private idService: IdService,
 		private fanoutTimelineEndpointService: FanoutTimelineEndpointService,
-		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			const untilId = ps.untilId ?? (ps.untilDate ? this.idService.gen(ps.untilDate!) : null);
 			const sinceId = ps.sinceId ?? (ps.sinceDate ? this.idService.gen(ps.sinceDate!) : null);
 			const isSelf = me && (me.id === ps.userId);
 
-			const serverSettings = await this.metaService.fetch();
-
 			if (ps.withReplies && ps.withFiles) throw new ApiError(meta.errors.bothWithRepliesAndWithFiles);
 
 			// early return if me is blocked by requesting user
@@ -94,7 +93,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				}
 			}
 
-			if (!serverSettings.enableFanoutTimeline) {
+			if (!this.serverSettings.enableFanoutTimeline) {
 				const timeline = await this.getFromDb({
 					untilId,
 					sinceId,
diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index f55790b636..dd7bb7823e 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -9,7 +9,7 @@ import { fileURLToPath } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
 import { createBullBoard } from '@bull-board/api';
 import { BullMQAdapter } from '@bull-board/api/bullMQAdapter.js';
-import { FastifyAdapter } from '@bull-board/fastify';
+import { FastifyAdapter as BullBoardFastifyAdapter } from '@bull-board/fastify';
 import ms from 'ms';
 import sharp from 'sharp';
 import pug from 'pug';
@@ -24,7 +24,6 @@ import type { Config } from '@/config.js';
 import { getNoteSummary } from '@/misc/get-note-summary.js';
 import { DI } from '@/di-symbols.js';
 import * as Acct from '@/misc/acct.js';
-import { MetaService } from '@/core/MetaService.js';
 import type {
 	DbQueue,
 	DeliverQueue,
@@ -61,7 +60,8 @@ const staticAssets = `${_dirname}/../../../assets/`;
 const clientAssets = `${_dirname}/../../../../frontend/assets/`;
 const assets = `${_dirname}/../../../../../built/_frontend_dist_/`;
 const swAssets = `${_dirname}/../../../../../built/_sw_dist_/`;
-const viteOut = `${_dirname}/../../../../../built/_vite_/`;
+const frontendViteOut = `${_dirname}/../../../../../built/_frontend_vite_/`;
+const frontendEmbedViteOut = `${_dirname}/../../../../../built/_frontend_embed_vite_/`;
 const tarball = `${_dirname}/../../../../../built/tarball/`;
 
 @Injectable()
@@ -72,6 +72,9 @@ export class ClientServerService {
 		@Inject(DI.config)
 		private config: Config,
 
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
@@ -108,7 +111,6 @@ export class ClientServerService {
 		private clipEntityService: ClipEntityService,
 		private channelEntityService: ChannelEntityService,
 		private reversiGameEntityService: ReversiGameEntityService,
-		private metaService: MetaService,
 		private urlPreviewService: UrlPreviewService,
 		private feedService: FeedService,
 		private roleService: RoleService,
@@ -128,32 +130,30 @@ export class ClientServerService {
 
 	@bindThis
 	private async manifestHandler(reply: FastifyReply) {
-		const instance = await this.metaService.fetch(true);
-
 		let manifest = {
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'short_name': instance.shortName || instance.name || this.config.host,
+			'short_name': this.meta.shortName || this.meta.name || this.config.host,
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'name': instance.name || this.config.host,
+			'name': this.meta.name || this.config.host,
 			'start_url': '/',
 			'display': 'standalone',
 			'background_color': '#313a42',
 			// 空文字列の場合右辺を使いたいため
 			// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-			'theme_color': instance.themeColor || '#86b300',
+			'theme_color': this.meta.themeColor || '#86b300',
 			'icons': [{
 				// 空文字列の場合右辺を使いたいため
 				// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-				'src': instance.app192IconUrl || '/static-assets/icons/192.png',
+				'src': this.meta.app192IconUrl || '/static-assets/icons/192.png',
 				'sizes': '192x192',
 				'type': 'image/png',
 				'purpose': 'maskable',
 			}, {
 				// 空文字列の場合右辺を使いたいため
 				// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-				'src': instance.app512IconUrl || '/static-assets/icons/512.png',
+				'src': this.meta.app512IconUrl || '/static-assets/icons/512.png',
 				'sizes': '512x512',
 				'type': 'image/png',
 				'purpose': 'maskable',
@@ -177,7 +177,7 @@ export class ClientServerService {
 
 		manifest = {
 			...manifest,
-			...JSON.parse(instance.manifestJsonOverride === '' ? '{}' : instance.manifestJsonOverride),
+			...JSON.parse(this.meta.manifestJsonOverride === '' ? '{}' : this.meta.manifestJsonOverride),
 		};
 
 		reply.header('Cache-Control', 'max-age=300');
@@ -239,7 +239,7 @@ export class ClientServerService {
 			}
 		});
 
-		const serverAdapter = new FastifyAdapter();
+		const bullBoardServerAdapter = new BullBoardFastifyAdapter();
 
 		createBullBoard({
 			queues: [
@@ -252,11 +252,11 @@ export class ClientServerService {
 				this.userWebhookDeliverQueue,
 				this.systemWebhookDeliverQueue,
 			].map(q => new BullMQAdapter(q)),
-			serverAdapter,
+			serverAdapter: bullBoardServerAdapter,
 		});
 
-		serverAdapter.setBasePath(bullBoardPath);
-		(fastify.register as any)(serverAdapter.registerPlugin(), { prefix: bullBoardPath });
+		bullBoardServerAdapter.setBasePath(bullBoardPath);
+		(fastify.register as any)(bullBoardServerAdapter.registerPlugin(), { prefix: bullBoardPath });
 		//#endregion
 
 		fastify.register(fastifyView, {
@@ -277,15 +277,22 @@ export class ClientServerService {
 		});
 
 		//#region vite assets
-		if (this.config.clientManifestExists) {
+		if (this.config.frontendEmbedManifestExists) {
 			fastify.register((fastify, options, done) => {
 				fastify.register(fastifyStatic, {
-					root: viteOut,
+					root: frontendViteOut,
 					prefix: '/vite/',
 					maxAge: ms('30 days'),
 					immutable: true,
 					decorateReply: false,
 				});
+				fastify.register(fastifyStatic, {
+					root: frontendEmbedViteOut,
+					prefix: '/embed_vite/',
+					maxAge: ms('30 days'),
+					immutable: true,
+					decorateReply: false,
+				});
 				fastify.addHook('onRequest', handleRequestRedirectToOmitSearch);
 				done();
 			});
@@ -296,6 +303,13 @@ export class ClientServerService {
 				prefix: '/vite',
 				rewritePrefix: '/vite',
 			});
+
+			const embedPort = (process.env.EMBED_VITE_PORT ?? '5174');
+			fastify.register(fastifyProxy, {
+				upstream: 'http://localhost:' + embedPort,
+				prefix: '/embed_vite',
+				rewritePrefix: '/embed_vite',
+			});
 		}
 		//#endregion
 
@@ -425,15 +439,20 @@ export class ClientServerService {
 		// Manifest
 		fastify.get('/manifest.json', async (request, reply) => await this.manifestHandler(reply));
 
+		// Embed Javascript
+		fastify.get('/embed.js', async (request, reply) => {
+			return await reply.sendFile('/embed.js', staticAssets, {
+				maxAge: ms('1 day'),
+			});
+		});
+
 		fastify.get('/robots.txt', async (request, reply) => {
 			return await reply.sendFile('/robots.txt', staticAssets);
 		});
 
 		// OpenSearch XML
 		fastify.get('/opensearch.xml', async (request, reply) => {
-			const meta = await this.metaService.fetch();
-
-			const name = meta.name ?? 'Misskey';
+			const name = this.meta.name ?? 'Misskey';
 			let content = '';
 			content += '<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">';
 			content += `<ShortName>${name}</ShortName>`;
@@ -450,14 +469,13 @@ export class ClientServerService {
 		//#endregion
 
 		const renderBase = async (reply: FastifyReply, data: { [key: string]: any } = {}) => {
-			const meta = await this.metaService.fetch();
 			reply.header('Cache-Control', 'public, max-age=30');
 			return await reply.view('base', {
-				img: meta.bannerUrl,
+				img: this.meta.bannerUrl,
 				url: this.config.url,
-				title: meta.name ?? 'Misskey',
-				desc: meta.description,
-				...await this.generateCommonPugData(meta),
+				title: this.meta.name ?? 'Misskey',
+				desc: this.meta.description,
+				...await this.generateCommonPugData(this.meta),
 				...data,
 			});
 		};
@@ -535,7 +553,6 @@ export class ClientServerService {
 
 			if (user != null) {
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: user.id });
-				const meta = await this.metaService.fetch();
 				const me = profile.fields
 					? profile.fields
 						.filter(filed => filed.value != null && filed.value.match(/^https?:/))
@@ -551,7 +568,7 @@ export class ClientServerService {
 					user, profile, me,
 					avatarUrl: user.avatarUrl ?? this.userEntityService.getIdenticonUrl(user),
 					sub: request.params.sub,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				// リモートユーザーなので
@@ -589,7 +606,6 @@ export class ClientServerService {
 			if (note) {
 				const _note = await this.noteEntityService.pack(note);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: note.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@@ -601,7 +617,7 @@ export class ClientServerService {
 					avatarUrl: _note.user.avatarUrl,
 					// TODO: Let locale changeable by instance setting
 					summary: getNoteSummary(_note),
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -626,7 +642,6 @@ export class ClientServerService {
 			if (page) {
 				const _page = await this.pageEntityService.pack(page);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: page.userId });
-				const meta = await this.metaService.fetch();
 				if (['public'].includes(page.visibility)) {
 					reply.header('Cache-Control', 'public, max-age=15');
 				} else {
@@ -640,7 +655,7 @@ export class ClientServerService {
 					page: _page,
 					profile,
 					avatarUrl: _page.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -656,7 +671,6 @@ export class ClientServerService {
 			if (flash) {
 				const _flash = await this.flashEntityService.pack(flash);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: flash.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@@ -666,7 +680,7 @@ export class ClientServerService {
 					flash: _flash,
 					profile,
 					avatarUrl: _flash.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -682,7 +696,6 @@ export class ClientServerService {
 			if (clip && clip.isPublic) {
 				const _clip = await this.clipEntityService.pack(clip);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: clip.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@@ -692,7 +705,7 @@ export class ClientServerService {
 					clip: _clip,
 					profile,
 					avatarUrl: _clip.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -706,7 +719,6 @@ export class ClientServerService {
 			if (post) {
 				const _post = await this.galleryPostEntityService.pack(post);
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: post.userId });
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				if (profile.preventAiLearning) {
 					reply.header('X-Robots-Tag', 'noimageai');
@@ -716,7 +728,7 @@ export class ClientServerService {
 					post: _post,
 					profile,
 					avatarUrl: _post.user.avatarUrl,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -731,11 +743,10 @@ export class ClientServerService {
 
 			if (channel) {
 				const _channel = await this.channelEntityService.pack(channel);
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=15');
 				return await reply.view('channel', {
 					channel: _channel,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -750,11 +761,10 @@ export class ClientServerService {
 
 			if (game) {
 				const _game = await this.reversiGameEntityService.packDetail(game);
-				const meta = await this.metaService.fetch();
 				reply.header('Cache-Control', 'public, max-age=3600');
 				return await reply.view('reversi-game', {
 					game: _game,
-					...await this.generateCommonPugData(meta),
+					...await this.generateCommonPugData(this.meta),
 				});
 			} else {
 				return await renderBase(reply);
@@ -762,7 +772,7 @@ export class ClientServerService {
 		});
 		//#endregion
 
-		//region noindex pages
+		//#region noindex pages
 		// Tags
 		fastify.get<{ Params: { clip: string; } }>('/tags/:tag', async (request, reply) => {
 			return await renderBase(reply, { noindex: true });
@@ -772,21 +782,97 @@ export class ClientServerService {
 		fastify.get<{ Params: { clip: string; } }>('/user-tags/:tag', async (request, reply) => {
 			return await renderBase(reply, { noindex: true });
 		});
-		//endregion
+		//#endregion
 
-		fastify.get('/_info_card_', async (request, reply) => {
-			const meta = await this.metaService.fetch(true);
+		//#region embed pages
+		fastify.get<{ Params: { user: string; } }>('/embed/user-timeline/:user', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');
+
+			const user = await this.usersRepository.findOneBy({
+				id: request.params.user,
+			});
+
+			if (user == null) return;
+			if (user.host != null) return;
+
+			const _user = await this.userEntityService.pack(user);
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'Misskey',
+				...await this.generateCommonPugData(this.meta),
+				embedCtx: htmlSafeJsonStringify({
+					user: _user,
+				}),
+			});
+		});
+
+		fastify.get<{ Params: { note: string; } }>('/embed/notes/:note', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');
 
+			const note = await this.notesRepository.findOneBy({
+				id: request.params.note,
+			});
+
+			if (note == null) return;
+			if (note.visibility !== 'public') return;
+			if (note.userHost != null) return;
+
+			const _note = await this.noteEntityService.pack(note, null, { detail: true });
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'Misskey',
+				...await this.generateCommonPugData(this.meta),
+				embedCtx: htmlSafeJsonStringify({
+					note: _note,
+				}),
+			});
+		});
+
+		fastify.get<{ Params: { clip: string; } }>('/embed/clips/:clip', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');
+
+			const clip = await this.clipsRepository.findOneBy({
+				id: request.params.clip,
+			});
+
+			if (clip == null) return;
+
+			const _clip = await this.clipEntityService.pack(clip);
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'Misskey',
+				...await this.generateCommonPugData(this.meta),
+				embedCtx: htmlSafeJsonStringify({
+					clip: _clip,
+				}),
+			});
+		});
+
+		fastify.get('/embed/*', async (request, reply) => {
+			reply.removeHeader('X-Frame-Options');
+
+			reply.header('Cache-Control', 'public, max-age=3600');
+			return await reply.view('base-embed', {
+				title: this.meta.name ?? 'Misskey',
+				...await this.generateCommonPugData(this.meta),
+			});
+		});
+
+		fastify.get('/_info_card_', async (request, reply) => {
 			reply.removeHeader('X-Frame-Options');
 
 			return await reply.view('info-card', {
 				version: this.config.version,
 				host: this.config.host,
-				meta: meta,
+				meta: this.meta,
 				originalUsersCount: await this.usersRepository.countBy({ host: IsNull() }),
 				originalNotesCount: await this.notesRepository.countBy({ userHost: IsNull() }),
 			});
 		});
+		//#endregion
 
 		fastify.get('/bios', async (request, reply) => {
 			return await reply.view('bios', {
diff --git a/packages/backend/src/server/web/UrlPreviewService.ts b/packages/backend/src/server/web/UrlPreviewService.ts
index 8f8f08a305..5d493c2c46 100644
--- a/packages/backend/src/server/web/UrlPreviewService.ts
+++ b/packages/backend/src/server/web/UrlPreviewService.ts
@@ -8,7 +8,6 @@ import { summaly } from '@misskey-dev/summaly';
 import { SummalyResult } from '@misskey-dev/summaly/built/summary.js';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
-import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import type Logger from '@/logger.js';
 import { query } from '@/misc/prelude/url.js';
@@ -26,7 +25,9 @@ export class UrlPreviewService {
 		@Inject(DI.config)
 		private config: Config,
 
-		private metaService: MetaService,
+		@Inject(DI.meta)
+		private meta: MiMeta,
+
 		private httpRequestService: HttpRequestService,
 		private loggerService: LoggerService,
 	) {
@@ -62,9 +63,7 @@ export class UrlPreviewService {
 			return;
 		}
 
-		const meta = await this.metaService.fetch();
-
-		if (!meta.urlPreviewEnabled) {
+		if (!this.meta.urlPreviewEnabled) {
 			reply.code(403);
 			return {
 				error: new ApiError({
@@ -75,14 +74,14 @@ export class UrlPreviewService {
 			};
 		}
 
-		this.logger.info(meta.urlPreviewSummaryProxyUrl
+		this.logger.info(this.meta.urlPreviewSummaryProxyUrl
 			? `(Proxy) Getting preview of ${url}@${lang} ...`
 			: `Getting preview of ${url}@${lang} ...`);
 
 		try {
-			const summary = meta.urlPreviewSummaryProxyUrl
-				? await this.fetchSummaryFromProxy(url, meta, lang)
-				: await this.fetchSummary(url, meta, lang);
+			const summary = this.meta.urlPreviewSummaryProxyUrl
+				? await this.fetchSummaryFromProxy(url, this.meta, lang)
+				: await this.fetchSummary(url, this.meta, lang);
 
 			this.logger.succ(`Got preview of ${url}: ${summary.title}`);
 
diff --git a/packages/backend/src/server/web/boot.embed.js b/packages/backend/src/server/web/boot.embed.js
new file mode 100644
index 0000000000..48d1cd262b
--- /dev/null
+++ b/packages/backend/src/server/web/boot.embed.js
@@ -0,0 +1,219 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+'use strict';
+
+// ブロックの中に入れないと、定義した変数がブラウザのグローバルスコープに登録されてしまい邪魔なので
+(async () => {
+	window.onerror = (e) => {
+		console.error(e);
+		renderError('SOMETHING_HAPPENED');
+	};
+	window.onunhandledrejection = (e) => {
+		console.error(e);
+		renderError('SOMETHING_HAPPENED_IN_PROMISE');
+	};
+
+	let forceError = localStorage.getItem('forceError');
+	if (forceError != null) {
+		renderError('FORCED_ERROR', 'This error is forced by having forceError in local storage.');
+		return;
+	}
+
+	// パラメータに応じてsplashのスタイルを変更
+	const params = new URLSearchParams(location.search);
+	if (params.has('rounded') && params.get('rounded') === 'false') {
+		document.documentElement.classList.add('norounded');
+	}
+	if (params.has('border') && params.get('border') === 'false') {
+		document.documentElement.classList.add('noborder');
+	}
+
+	//#region Detect language & fetch translations
+	if (!localStorage.hasOwnProperty('locale')) {
+		const supportedLangs = LANGS;
+		let lang = localStorage.getItem('lang');
+		if (lang == null || !supportedLangs.includes(lang)) {
+			if (supportedLangs.includes(navigator.language)) {
+				lang = navigator.language;
+			} else {
+				lang = supportedLangs.find(x => x.split('-')[0] === navigator.language);
+
+				// Fallback
+				if (lang == null) lang = 'en-US';
+			}
+		}
+
+		const metaRes = await window.fetch('/api/meta', {
+			method: 'POST',
+			body: JSON.stringify({}),
+			credentials: 'omit',
+			cache: 'no-cache',
+			headers: {
+				'Content-Type': 'application/json',
+			},
+		});
+		if (metaRes.status !== 200) {
+			renderError('META_FETCH');
+			return;
+		}
+		const meta = await metaRes.json();
+		const v = meta.version;
+		if (v == null) {
+			renderError('META_FETCH_V');
+			return;
+		}
+
+		// for https://github.com/misskey-dev/misskey/issues/10202
+		if (lang == null || lang.toString == null || lang.toString() === 'null') {
+			console.error('invalid lang value detected!!!', typeof lang, lang);
+			lang = 'en-US';
+		}
+
+		const localRes = await window.fetch(`/assets/locales/${lang}.${v}.json`);
+		if (localRes.status === 200) {
+			localStorage.setItem('lang', lang);
+			localStorage.setItem('locale', await localRes.text());
+			localStorage.setItem('localeVersion', v);
+		} else {
+			renderError('LOCALE_FETCH');
+			return;
+		}
+	}
+	//#endregion
+
+	//#region Script
+	async function importAppScript() {
+		await import(`/embed_vite/${CLIENT_ENTRY}`)
+			.catch(async e => {
+				console.error(e);
+				renderError('APP_IMPORT');
+			});
+	}
+
+	// タイミングによっては、この時点でDOMの構築が済んでいる場合とそうでない場合とがある
+	if (document.readyState !== 'loading') {
+		importAppScript();
+	} else {
+		window.addEventListener('DOMContentLoaded', () => {
+			importAppScript();
+		});
+	}
+	//#endregion
+
+	async function addStyle(styleText) {
+		let css = document.createElement('style');
+		css.appendChild(document.createTextNode(styleText));
+		document.head.appendChild(css);
+	}
+
+	async function renderError(code) {
+		// Cannot set property 'innerHTML' of null を回避
+		if (document.readyState === 'loading') {
+			await new Promise(resolve => window.addEventListener('DOMContentLoaded', resolve));
+		}
+		document.body.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="icon"><path stroke="none" d="M0 0h24v24H0z" fill="none"/><path d="M12 12m-9 0a9 9 0 1 0 18 0a9 9 0 1 0 -18 0" /><path d="M12 9v4" /><path d="M12 16v.01" /></svg>
+		<div class="message">読み込みに失敗しました</div>
+		<div class="submessage">Failed to initialize Misskey</div>
+		<div class="submessage">Error Code: ${code}</div>
+		<button onclick="location.reload(!0)">
+			<div>リロード</div>
+			<div><small>Reload</small></div>
+		</button>`;
+		addStyle(`
+		#misskey_app,
+		#splash {
+			display: none !important;
+		}
+
+		html,
+		body {
+			margin: 0;
+		}
+
+		body {
+			position: relative;
+			color: #dee7e4;
+			font-family: Hiragino Maru Gothic Pro, BIZ UDGothic, Roboto, HelveticaNeue, Arial, sans-serif;
+			line-height: 1.35;
+			display: flex;
+			flex-direction: column;
+			align-items: center;
+			justify-content: center;
+			min-height: 100vh;
+			margin: 0;
+			padding: 24px;
+			box-sizing: border-box;
+			overflow: hidden;
+
+			border-radius: var(--radius, 12px);
+			border: 1px solid rgba(231, 255, 251, 0.14);
+		}
+
+		body::before {
+			content: '';
+			position: fixed;
+			top: 0;
+			left: 0;
+			width: 100%;
+			height: 100%;
+			background: #192320;
+			border-radius: var(--radius, 12px);
+			z-index: -1;
+		}
+
+		html.embed.norounded body,
+		html.embed.norounded body::before {
+			border-radius: 0;
+		}
+
+		html.embed.noborder body {
+			border: none;
+		}
+
+		.icon {
+			max-width: 60px;
+			width: 100%;
+			height: auto;
+			margin-bottom: 20px;
+			color: #dec340;
+		}
+
+		.message {
+			text-align: center;
+			font-size: 20px;
+			font-weight: 700;
+			margin-bottom: 20px;
+		}
+
+		.submessage {
+			text-align: center;
+			font-size: 90%;
+			margin-bottom: 7.5px;
+		}
+
+		.submessage:last-of-type {
+			margin-bottom: 20px;
+		}
+
+		button {
+			padding: 7px 14px;
+			min-width: 100px;
+			font-weight: 700;
+			font-family: Hiragino Maru Gothic Pro, BIZ UDGothic, Roboto, HelveticaNeue, Arial, sans-serif;
+			line-height: 1.35;
+			border-radius: 99rem;
+			background-color: #b4e900;
+			color: #192320;
+			border: none;
+			cursor: pointer;
+			-webkit-tap-highlight-color: transparent;
+		}
+
+		button:hover {
+			background-color: #c6ff03;
+		}`);
+	}
+})();
diff --git a/packages/backend/src/server/web/boot.js b/packages/backend/src/server/web/boot.js
index 4275dc9527..7c6a533429 100644
--- a/packages/backend/src/server/web/boot.js
+++ b/packages/backend/src/server/web/boot.js
@@ -3,17 +3,6 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-/**
- * BOOT LOADER
- * サーバーからレスポンスされるHTMLに埋め込まれるスクリプトで、以下の役割を持ちます。
- * - 翻訳ファイルをフェッチする。
- * - バージョンに基づいて適切なメインスクリプトを読み込む。
- * - キャッシュされたコンパイル済みテーマを適用する。
- * - クライアントの設定値に基づいて対応するHTMLクラス等を設定する。
- * テーマをこの段階で設定するのは、メインスクリプトが読み込まれる間もテーマを適用したいためです。
- * 注: webpackは介さないため、このファイルではrequireやimportは使えません。
- */
-
 'use strict';
 
 // ブロックの中に入れないと、定義した変数がブラウザのグローバルスコープに登録されてしまい邪魔なので
@@ -166,7 +155,7 @@
 
 		if (!errorsElement) {
 			document.body.innerHTML = `
-			<svg class="icon-warning" xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-alert-triangle" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
+			<svg class="icon-warning" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
 				<path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
 				<path d="M12 9v2m0 4v.01"></path>
 				<path d="M5 19h14a2 2 0 0 0 1.84 -2.75l-7.1 -12.25a2 2 0 0 0 -3.5 0l-7.1 12.25a2 2 0 0 0 1.75 2.75"></path>
@@ -176,10 +165,10 @@
 				<span class="button-label-big">Reload / リロード</span>
 			</button>
 			<p><b>The following actions may solve the problem. / 以下を行うと解決する可能性があります。</b></p>
-			<p>Clear the browser cache / ブラウザのキャッシュをクリアする</p>
 			<p>Update your os and browser / ブラウザおよびOSを最新バージョンに更新する</p>
 			<p>Disable an adblocker / アドブロッカーを無効にする</p>
-	 		<p>&#40;Tor Browser&#41; Set dom.webaudio.enabled to true / dom.webaudio.enabledをtrueに設定する</p>
+			<p>Clear the browser cache / ブラウザのキャッシュをクリアする</p>
+			<p>&#40;Tor Browser&#41; Set dom.webaudio.enabled to true / dom.webaudio.enabledをtrueに設定する</p>
 			<details style="color: #86b300;">
 				<summary>Other options / その他のオプション</summary>
 				<a href="/flush">
@@ -212,7 +201,7 @@
 		<summary>
 			<code>ERROR CODE: ${code}</code>
 		</summary>
-		<code>${JSON.stringify(details)}</code>`;
+		<code>${details.toString()} ${JSON.stringify(details)}</code>`;
 		errorsElement.appendChild(detailsElement);
 		addStyle(`
 		* {
@@ -320,6 +309,6 @@
 			#errorInfo {
 				width: 50%;
 			}
-		}`)
+		}`);
 	}
 })();
diff --git a/packages/backend/src/server/web/style.css b/packages/backend/src/server/web/style.css
index e4723c24fd..dbcc8f537c 100644
--- a/packages/backend/src/server/web/style.css
+++ b/packages/backend/src/server/web/style.css
@@ -47,6 +47,7 @@ html {
 	transform: translateY(70px);
 	color: var(--accent);
 }
+
 #splashSpinner > .spinner {
 	position: absolute;
 	top: 0;
diff --git a/packages/backend/src/server/web/style.embed.css b/packages/backend/src/server/web/style.embed.css
new file mode 100644
index 0000000000..a7b110d80a
--- /dev/null
+++ b/packages/backend/src/server/web/style.embed.css
@@ -0,0 +1,99 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+html {
+	background-color: var(--bg);
+	color: var(--fg);
+}
+
+html.embed {
+	box-sizing: border-box;
+	background-color: transparent;
+	color-scheme: light dark;
+	max-width: 500px;
+}
+
+#splash {
+	position: fixed;
+	z-index: 10000;
+	top: 0;
+	left: 0;
+	width: 100vw;
+	height: 100vh;
+	cursor: wait;
+	background-color: var(--bg);
+	opacity: 1;
+	transition: opacity 0.5s ease;
+}
+
+html.embed #splash {
+	box-sizing: border-box;
+	min-height: 300px;
+	border-radius: var(--radius, 12px);
+	border: 1px solid var(--divider, #e8e8e8);
+}
+
+html.embed.norounded #splash {
+	border-radius: 0;
+}
+
+html.embed.noborder #splash {
+	border: none;
+}
+
+#splashIcon {
+	position: absolute;
+	top: 0;
+	right: 0;
+	bottom: 0;
+	left: 0;
+	margin: auto;
+	width: 64px;
+	height: 64px;
+	pointer-events: none;
+}
+
+#splashSpinner {
+	position: absolute;
+	top: 0;
+	right: 0;
+	bottom: 0;
+	left: 0;
+	margin: auto;
+	display: inline-block;
+	width: 28px;
+	height: 28px;
+	transform: translateY(70px);
+	color: var(--accent);
+}
+
+#splashSpinner > .spinner {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 28px;
+	height: 28px;
+	fill-rule: evenodd;
+	clip-rule: evenodd;
+	stroke-linecap: round;
+	stroke-linejoin: round;
+	stroke-miterlimit: 1.5;
+}
+#splashSpinner > .spinner.bg {
+	opacity: 0.275;
+}
+#splashSpinner > .spinner.fg {
+	animation: splashSpinner 0.5s linear infinite;
+}
+
+@keyframes splashSpinner {
+	0% {
+		transform: rotate(0deg);
+	}
+	100% {
+		transform: rotate(360deg);
+	}
+}
diff --git a/packages/backend/src/server/web/views/base-embed.pug b/packages/backend/src/server/web/views/base-embed.pug
new file mode 100644
index 0000000000..baa0909676
--- /dev/null
+++ b/packages/backend/src/server/web/views/base-embed.pug
@@ -0,0 +1,72 @@
+block vars
+
+block loadClientEntry
+	- const entry = config.frontendEmbedEntry;
+
+doctype html
+
+html(class='embed')
+
+	head
+		meta(charset='utf-8')
+		meta(name='application-name' content='Misskey')
+		meta(name='referrer' content='origin')
+		meta(name='theme-color' content= themeColor || '#86b300')
+		meta(name='theme-color-orig' content= themeColor || '#86b300')
+		meta(property='og:site_name' content= instanceName || 'Misskey')
+		meta(property='instance_url' content= instanceUrl)
+		meta(name='viewport' content='width=device-width, initial-scale=1')
+		meta(name='format-detection' content='telephone=no,date=no,address=no,email=no,url=no')
+		link(rel='icon' href= icon || '/favicon.ico')
+		link(rel='apple-touch-icon' href= appleTouchIcon || '/apple-touch-icon.png')
+		link(rel='modulepreload' href=`/embed_vite/${entry.file}`)
+
+		if !config.frontendEmbedManifestExists
+				script(type="module" src="/embed_vite/@vite/client")
+
+		if Array.isArray(entry.css)
+			each href in entry.css
+				link(rel='stylesheet' href=`/embed_vite/${href}`)
+
+		title
+			block title
+				= title || 'Misskey'
+
+		block meta
+			meta(name='robots' content='noindex')
+
+		style
+			include ../style.embed.css
+
+		script.
+			var VERSION = "#{version}";
+			var CLIENT_ENTRY = "#{entry.file}";
+
+		script(type='application/json' id='misskey_meta' data-generated-at=now)
+			!= metaJson
+
+		script(type='application/json' id='misskey_embedCtx' data-generated-at=now)
+			!= embedCtx
+
+		script
+			include ../boot.embed.js
+
+	body
+		noscript: p
+			| JavaScriptを有効にしてください
+			br
+			| Please turn on your JavaScript
+		div#splash
+			img#splashIcon(src= icon || '/static-assets/splash.png')
+			div#splashSpinner
+				<svg class="spinner bg" viewBox="0 0 152 152" xmlns="http://www.w3.org/2000/svg">
+					<g transform="matrix(1,0,0,1,12,12)">
+						<circle cx="64" cy="64" r="64" style="fill:none;stroke:currentColor;stroke-width:24px;"/>
+					</g>
+				</svg>
+				<svg class="spinner fg" viewBox="0 0 152 152" xmlns="http://www.w3.org/2000/svg">
+					<g transform="matrix(1,0,0,1,12,12)">
+						<path d="M128,64C128,28.654 99.346,0 64,0C99.346,0 128,28.654 128,64Z" style="fill:none;stroke:currentColor;stroke-width:24px;"/>
+					</g>
+				</svg>
+		block content
diff --git a/packages/backend/src/server/web/views/base.pug b/packages/backend/src/server/web/views/base.pug
index 151b7bca6c..88714b2556 100644
--- a/packages/backend/src/server/web/views/base.pug
+++ b/packages/backend/src/server/web/views/base.pug
@@ -1,7 +1,7 @@
 block vars
 
 block loadClientEntry
-	- const clientEntry = config.clientEntry;
+	- const entry = config.frontendEntry;
 
 doctype html
 
@@ -36,15 +36,13 @@ html
 		link(rel='prefetch' href=serverErrorImageUrl)
 		link(rel='prefetch' href=infoImageUrl)
 		link(rel='prefetch' href=notFoundImageUrl)
-		//- https://github.com/misskey-dev/misskey/issues/9842
-		link(rel='stylesheet' href='/assets/tabler-icons/tabler-icons.min.css?v3.3.0')
-		link(rel='modulepreload' href=`/vite/${clientEntry.file}`)
+		link(rel='modulepreload' href=`/vite/${entry.file}`)
 
-		if !config.clientManifestExists
+		if !config.frontendManifestExists
 				script(type="module" src="/vite/@vite/client")
 
-		if Array.isArray(clientEntry.css)
-			each href in clientEntry.css
+		if Array.isArray(entry.css)
+			each href in entry.css
 				link(rel='stylesheet' href=`/vite/${href}`)
 
 		title
@@ -70,7 +68,7 @@ html
 
 		script.
 			var VERSION = "#{version}";
-			var CLIENT_ENTRY = "#{clientEntry.file}";
+			var CLIENT_ENTRY = "#{entry.file}";
 
 		script(type='application/json' id='misskey_meta' data-generated-at=now)
 			!= metaJson
diff --git a/packages/backend/src/types.ts b/packages/backend/src/types.ts
index e852cf5ae2..5854c6b392 100644
--- a/packages/backend/src/types.ts
+++ b/packages/backend/src/types.ts
@@ -16,6 +16,7 @@
  * followRequestAccepted - 自分の送ったフォローリクエストが承認された
  * roleAssigned - ロールが付与された
  * achievementEarned - 実績を獲得
+ * exportCompleted - エクスポートが完了
  * app - アプリ通知
  * test - テスト通知（サーバー側）
  */
@@ -32,6 +33,7 @@ export const notificationTypes = [
 	'followRequestAccepted',
 	'roleAssigned',
 	'achievementEarned',
+	'exportCompleted',
 	'app',
 	'test',
 ] as const;
@@ -51,6 +53,20 @@ export const mutedNoteReasons = ['word', 'manual', 'spam', 'other'] as const;
 export const followingVisibilities = ['public', 'followers', 'private'] as const;
 export const followersVisibilities = ['public', 'followers', 'private'] as const;
 
+/**
+ * ユーザーがエクスポートできるものの種類
+ *
+ * （主にエクスポート完了通知で使用するものであり、既存のDBの名称等と必ずしも一致しない）
+ */
+export const userExportableEntities = ['antenna', 'blocking', 'clip', 'customEmoji', 'favorite', 'following', 'muting', 'note', 'userList'] as const;
+
+/**
+ * ユーザーがインポートできるものの種類
+ *
+ * （主にインポート完了通知で使用するものであり、既存のDBの名称等と必ずしも一致しない）
+ */
+export const userImportableEntities = ['antenna', 'blocking', 'customEmoji', 'following', 'muting', 'userList'] as const;
+
 export const moderationLogTypes = [
 	'updateServerSettings',
 	'suspend',