Feat: Chat (#15686)

* wip

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* Update types.ts

* Create 1742203321812-chat.js

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* Update room.vue

* Update home.vue

* Update home.vue

* Update ja-JP.yml

* Update index.d.ts

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* Update CHANGELOG.md

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* Update home.vue

* clean up

* Update misskey-js.api.md

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* lint fixes

* lint

* Update UserEntityService.ts

* search

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* 🎨

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* Update home.ownedRooms.vue

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* Update CHANGELOG.md

* Update style.scss

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* improve performance

* improve performance

* Update timeline.test.ts

15 files changed, 603 insertions, 87 deletions

diff --git a/packages/backend/src/models/ChatApproval.ts b/packages/backend/src/models/ChatApproval.ts
new file mode 100644
index 0000000000..55c9f07e9a
--- /dev/null
+++ b/packages/backend/src/models/ChatApproval.ts
@@ -0,0 +1,39 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { id } from './util/id.js';
+import { MiUser } from './User.js';
+
+@Entity('chat_approval')
+@Index(['userId', 'otherId'], { unique: true })
+export class MiChatApproval {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public userId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public user: MiUser | null;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public otherId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public other: MiUser | null;
+}
diff --git a/packages/backend/src/models/ChatMessage.ts b/packages/backend/src/models/ChatMessage.ts
new file mode 100644
index 0000000000..3d2b64268e
--- /dev/null
+++ b/packages/backend/src/models/ChatMessage.ts
@@ -0,0 +1,85 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { id } from './util/id.js';
+import { MiUser } from './User.js';
+import { MiDriveFile } from './DriveFile.js';
+import { MiChatRoom } from './ChatRoom.js';
+
+@Entity('chat_message')
+export class MiChatMessage {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public fromUserId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public fromUser: MiUser | null;
+
+	@Index()
+	@Column({
+		...id(), nullable: true,
+	})
+	public toUserId: MiUser['id'] | null;
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public toUser: MiUser | null;
+
+	@Index()
+	@Column({
+		...id(), nullable: true,
+	})
+	public toRoomId: MiChatRoom['id'] | null;
+
+	@ManyToOne(type => MiChatRoom, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public toRoom: MiChatRoom | null;
+
+	@Column('varchar', {
+		length: 4096, nullable: true,
+	})
+	public text: string | null;
+
+	@Column('varchar', {
+		length: 512, nullable: true,
+	})
+	public uri: string | null;
+
+	@Column({
+		...id(),
+		array: true, default: '{}',
+	})
+	public reads: MiUser['id'][];
+
+	@Column({
+		...id(),
+		nullable: true,
+	})
+	public fileId: MiDriveFile['id'] | null;
+
+	@ManyToOne(type => MiDriveFile, {
+		onDelete: 'SET NULL',
+	})
+	@JoinColumn()
+	public file: MiDriveFile | null;
+
+	@Column('varchar', {
+		length: 1024, array: true, default: '{}',
+	})
+	public reactions: string[];
+}
diff --git a/packages/backend/src/models/ChatRoom.ts b/packages/backend/src/models/ChatRoom.ts
new file mode 100644
index 0000000000..ad2a910b78
--- /dev/null
+++ b/packages/backend/src/models/ChatRoom.ts
@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { id } from './util/id.js';
+import { MiUser } from './User.js';
+
+@Entity('chat_room')
+export class MiChatRoom {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Column('varchar', {
+		length: 256,
+	})
+	public name: string;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public ownerId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public owner: MiUser | null;
+
+	@Column('varchar', {
+		length: 2048, default: '',
+	})
+	public description: string;
+
+	@Column('boolean', {
+		default: false,
+	})
+	public isArchived: boolean;
+}
diff --git a/packages/backend/src/models/ChatRoomInvitation.ts b/packages/backend/src/models/ChatRoomInvitation.ts
new file mode 100644
index 0000000000..36ce12bc92
--- /dev/null
+++ b/packages/backend/src/models/ChatRoomInvitation.ts
@@ -0,0 +1,45 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { id } from './util/id.js';
+import { MiUser } from './User.js';
+import { MiChatRoom } from './ChatRoom.js';
+
+@Entity('chat_room_invitation')
+@Index(['userId', 'roomId'], { unique: true })
+export class MiChatRoomInvitation {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public userId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public user: MiUser | null;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public roomId: MiChatRoom['id'];
+
+	@ManyToOne(type => MiChatRoom, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public room: MiChatRoom | null;
+
+	@Column('boolean', {
+		default: false,
+	})
+	public ignored: boolean;
+}
diff --git a/packages/backend/src/models/ChatRoomMembership.ts b/packages/backend/src/models/ChatRoomMembership.ts
new file mode 100644
index 0000000000..3cb5524859
--- /dev/null
+++ b/packages/backend/src/models/ChatRoomMembership.ts
@@ -0,0 +1,45 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { id } from './util/id.js';
+import { MiUser } from './User.js';
+import { MiChatRoom } from './ChatRoom.js';
+
+@Entity('chat_room_membership')
+@Index(['userId', 'roomId'], { unique: true })
+export class MiChatRoomMembership {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public userId: MiUser['id'];
+
+	@ManyToOne(type => MiUser, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public user: MiUser | null;
+
+	@Index()
+	@Column({
+		...id(),
+	})
+	public roomId: MiChatRoom['id'];
+
+	@ManyToOne(type => MiChatRoom, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public room: MiChatRoom | null;
+
+	@Column('boolean', {
+		default: false,
+	})
+	public isMuted: boolean;
+}
diff --git a/packages/backend/src/models/NoteUnread.ts b/packages/backend/src/models/NoteUnread.ts
deleted file mode 100644
index c759181117..0000000000
--- a/packages/backend/src/models/NoteUnread.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
-import { id } from './util/id.js';
-import { MiUser } from './User.js';
-import { MiNote } from './Note.js';
-import type { MiChannel } from './Channel.js';
-
-@Entity('note_unread')
-@Index(['userId', 'noteId'], { unique: true })
-export class MiNoteUnread {
-	@PrimaryColumn(id())
-	public id: string;
-
-	@Index()
-	@Column(id())
-	public userId: MiUser['id'];
-
-	@ManyToOne(type => MiUser, {
-		onDelete: 'CASCADE',
-	})
-	@JoinColumn()
-	public user: MiUser | null;
-
-	@Index()
-	@Column(id())
-	public noteId: MiNote['id'];
-
-	@ManyToOne(type => MiNote, {
-		onDelete: 'CASCADE',
-	})
-	@JoinColumn()
-	public note: MiNote | null;
-
-	/**
-	 * メンションか否か
-	 */
-	@Index()
-	@Column('boolean')
-	public isMentioned: boolean;
-
-	/**
-	 * ダイレクト投稿か否か
-	 */
-	@Index()
-	@Column('boolean')
-	public isSpecified: boolean;
-
-	//#region Denormalized fields
-	@Index()
-	@Column({
-		...id(),
-		comment: '[Denormalized]',
-	})
-	public noteUserId: MiUser['id'];
-
-	@Index()
-	@Column({
-		...id(),
-		nullable: true,
-		comment: '[Denormalized]',
-	})
-	public noteChannelId: MiChannel['id'] | null;
-	//#endregion
-}
diff --git a/packages/backend/src/models/RepositoryModule.ts b/packages/backend/src/models/RepositoryModule.ts
index 04a9df6cfb..b7142d91bf 100644
--- a/packages/backend/src/models/RepositoryModule.ts
+++ b/packages/backend/src/models/RepositoryModule.ts
@@ -42,7 +42,6 @@ import {
 	MiNoteFavorite,
 	MiNoteReaction,
 	MiNoteThreadMuting,
-	MiNoteUnread,
 	MiPage,
 	MiPageLike,
 	MiPasswordResetRequest,
@@ -78,6 +77,11 @@ import {
 	MiUserPublickey,
 	MiUserSecurityKey,
 	MiWebhook,
+	MiChatMessage,
+	MiChatRoom,
+	MiChatRoomMembership,
+	MiChatRoomInvitation,
+	MiChatApproval,
 } from './_.js';
 import type { Provider } from '@nestjs/common';
 import type { DataSource } from 'typeorm';
@@ -136,12 +140,6 @@ const $noteReactionsRepository: Provider = {
 	inject: [DI.db],
 };
 
-const $noteUnreadsRepository: Provider = {
-	provide: DI.noteUnreadsRepository,
-	useFactory: (db: DataSource) => db.getRepository(MiNoteUnread).extend(miRepository as MiRepository<MiNoteUnread>),
-	inject: [DI.db],
-};
-
 const $pollsRepository: Provider = {
 	provide: DI.pollsRepository,
 	useFactory: (db: DataSource) => db.getRepository(MiPoll).extend(miRepository as MiRepository<MiPoll>),
@@ -288,7 +286,7 @@ const $swSubscriptionsRepository: Provider = {
 
 const $systemAccountsRepository: Provider = {
 	provide: DI.systemAccountsRepository,
-	useFactory: (db: DataSource) => db.getRepository(MiSystemAccount),
+	useFactory: (db: DataSource) => db.getRepository(MiSystemAccount).extend(miRepository as MiRepository<MiSystemAccount>),
 	inject: [DI.db],
 };
 
@@ -306,7 +304,7 @@ const $abuseUserReportsRepository: Provider = {
 
 const $abuseReportNotificationRecipientRepository: Provider = {
 	provide: DI.abuseReportNotificationRecipientRepository,
-	useFactory: (db: DataSource) => db.getRepository(MiAbuseReportNotificationRecipient),
+	useFactory: (db: DataSource) => db.getRepository(MiAbuseReportNotificationRecipient).extend(miRepository as MiRepository<MiAbuseReportNotificationRecipient>),
 	inject: [DI.db],
 };
 
@@ -438,7 +436,7 @@ const $webhooksRepository: Provider = {
 
 const $systemWebhooksRepository: Provider = {
 	provide: DI.systemWebhooksRepository,
-	useFactory: (db: DataSource) => db.getRepository(MiSystemWebhook),
+	useFactory: (db: DataSource) => db.getRepository(MiSystemWebhook).extend(miRepository as MiRepository<MiSystemWebhook>),
 	inject: [DI.db],
 };
 
@@ -490,6 +488,36 @@ const $userMemosRepository: Provider = {
 	inject: [DI.db],
 };
 
+const $chatMessagesRepository: Provider = {
+	provide: DI.chatMessagesRepository,
+	useFactory: (db: DataSource) => db.getRepository(MiChatMessage).extend(miRepository as MiRepository<MiChatMessage>),
+	inject: [DI.db],
+};
+
+const $chatRoomsRepository: Provider = {
+	provide: DI.chatRoomsRepository,
+	useFactory: (db: DataSource) => db.getRepository(MiChatRoom).extend(miRepository as MiRepository<MiChatRoom>),
+	inject: [DI.db],
+};
+
+const $chatRoomMembershipsRepository: Provider = {
+	provide: DI.chatRoomMembershipsRepository,
+	useFactory: (db: DataSource) => db.getRepository(MiChatRoomMembership).extend(miRepository as MiRepository<MiChatRoomMembership>),
+	inject: [DI.db],
+};
+
+const $chatRoomInvitationsRepository: Provider = {
+	provide: DI.chatRoomInvitationsRepository,
+	useFactory: (db: DataSource) => db.getRepository(MiChatRoomInvitation).extend(miRepository as MiRepository<MiChatRoomInvitation>),
+	inject: [DI.db],
+};
+
+const $chatApprovalsRepository: Provider = {
+	provide: DI.chatApprovalsRepository,
+	useFactory: (db: DataSource) => db.getRepository(MiChatApproval).extend(miRepository as MiRepository<MiChatApproval>),
+	inject: [DI.db],
+};
+
 const $bubbleGameRecordsRepository: Provider = {
 	provide: DI.bubbleGameRecordsRepository,
 	useFactory: (db: DataSource) => db.getRepository(MiBubbleGameRecord).extend(miRepository as MiRepository<MiBubbleGameRecord>),
@@ -514,7 +542,6 @@ const $reversiGamesRepository: Provider = {
 		$noteFavoritesRepository,
 		$noteThreadMutingsRepository,
 		$noteReactionsRepository,
-		$noteUnreadsRepository,
 		$pollsRepository,
 		$pollVotesRepository,
 		$userProfilesRepository,
@@ -573,6 +600,11 @@ const $reversiGamesRepository: Provider = {
 		$flashsRepository,
 		$flashLikesRepository,
 		$userMemosRepository,
+		$chatMessagesRepository,
+		$chatRoomsRepository,
+		$chatRoomMembershipsRepository,
+		$chatRoomInvitationsRepository,
+		$chatApprovalsRepository,
 		$bubbleGameRecordsRepository,
 		$reversiGamesRepository,
 	],
@@ -586,7 +618,6 @@ const $reversiGamesRepository: Provider = {
 		$noteFavoritesRepository,
 		$noteThreadMutingsRepository,
 		$noteReactionsRepository,
-		$noteUnreadsRepository,
 		$pollsRepository,
 		$pollVotesRepository,
 		$userProfilesRepository,
@@ -645,6 +676,11 @@ const $reversiGamesRepository: Provider = {
 		$flashsRepository,
 		$flashLikesRepository,
 		$userMemosRepository,
+		$chatMessagesRepository,
+		$chatRoomsRepository,
+		$chatRoomMembershipsRepository,
+		$chatRoomInvitationsRepository,
+		$chatApprovalsRepository,
 		$bubbleGameRecordsRepository,
 		$reversiGamesRepository,
 	],
diff --git a/packages/backend/src/models/User.ts b/packages/backend/src/models/User.ts
index 630240efde..bc652cea62 100644
--- a/packages/backend/src/models/User.ts
+++ b/packages/backend/src/models/User.ts
@@ -225,6 +225,17 @@ export class MiUser {
 	})
 	public emojis: string[];
 
+	// チャットを許可する相手
+	// everyone: 誰からでも
+	// followers: フォロワーのみ
+	// following: フォローしているユーザーのみ
+	// mutual: 相互フォローのみ
+	// none: 誰からも受け付けない
+	@Column('varchar', {
+		length: 128, default: 'mutual',
+	})
+	public chatScope: 'everyone' | 'followers' | 'following' | 'mutual' | 'none';
+
 	@Index()
 	@Column('varchar', {
 		length: 128, nullable: true,
diff --git a/packages/backend/src/models/_.ts b/packages/backend/src/models/_.ts
index fa15760c00..e852b302f3 100644
--- a/packages/backend/src/models/_.ts
+++ b/packages/backend/src/models/_.ts
@@ -3,13 +3,10 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { FindOneOptions, InsertQueryBuilder, ObjectLiteral, Repository, SelectQueryBuilder, TypeORMError } from 'typeorm';
-import { DriverUtils } from 'typeorm/driver/DriverUtils.js';
+import { FindOneOptions, InsertQueryBuilder, ObjectLiteral, Repository, SelectQueryBuilder } from 'typeorm';
 import { RelationCountLoader } from 'typeorm/query-builder/relation-count/RelationCountLoader.js';
 import { RelationIdLoader } from 'typeorm/query-builder/relation-id/RelationIdLoader.js';
 import { RawSqlResultsToEntityTransformer } from 'typeorm/query-builder/transformer/RawSqlResultsToEntityTransformer.js';
-import { ObjectUtils } from 'typeorm/util/ObjectUtils.js';
-import { OrmUtils } from 'typeorm/util/OrmUtils.js';
 import { MiAbuseUserReport } from '@/models/AbuseUserReport.js';
 import { MiAbuseReportNotificationRecipient } from '@/models/AbuseReportNotificationRecipient.js';
 import { MiAccessToken } from '@/models/AccessToken.js';
@@ -43,7 +40,6 @@ import { MiNote } from '@/models/Note.js';
 import { MiNoteFavorite } from '@/models/NoteFavorite.js';
 import { MiNoteReaction } from '@/models/NoteReaction.js';
 import { MiNoteThreadMuting } from '@/models/NoteThreadMuting.js';
-import { MiNoteUnread } from '@/models/NoteUnread.js';
 import { MiPage } from '@/models/Page.js';
 import { MiPageLike } from '@/models/PageLike.js';
 import { MiPasswordResetRequest } from '@/models/PasswordResetRequest.js';
@@ -78,6 +74,11 @@ import { MiRoleAssignment } from '@/models/RoleAssignment.js';
 import { MiFlash } from '@/models/Flash.js';
 import { MiFlashLike } from '@/models/FlashLike.js';
 import { MiUserListFavorite } from '@/models/UserListFavorite.js';
+import { MiChatMessage } from '@/models/ChatMessage.js';
+import { MiChatRoom } from '@/models/ChatRoom.js';
+import { MiChatRoomMembership } from '@/models/ChatRoomMembership.js';
+import { MiChatRoomInvitation } from '@/models/ChatRoomInvitation.js';
+import { MiChatApproval } from '@/models/ChatApproval.js';
 import { MiBubbleGameRecord } from '@/models/BubbleGameRecord.js';
 import { MiReversiGame } from '@/models/ReversiGame.js';
 import type { QueryDeepPartialEntity } from 'typeorm/query-builder/QueryPartialEntity.js';
@@ -159,7 +160,6 @@ export {
 	MiNoteFavorite,
 	MiNoteReaction,
 	MiNoteThreadMuting,
-	MiNoteUnread,
 	MiPage,
 	MiPageLike,
 	MiPasswordResetRequest,
@@ -194,6 +194,11 @@ export {
 	MiFlash,
 	MiFlashLike,
 	MiUserMemo,
+	MiChatMessage,
+	MiChatRoom,
+	MiChatRoomMembership,
+	MiChatRoomInvitation,
+	MiChatApproval,
 	MiBubbleGameRecord,
 	MiReversiGame,
 };
@@ -231,7 +236,6 @@ export type NotesRepository = Repository<MiNote> & MiRepository<MiNote>;
 export type NoteFavoritesRepository = Repository<MiNoteFavorite> & MiRepository<MiNoteFavorite>;
 export type NoteReactionsRepository = Repository<MiNoteReaction> & MiRepository<MiNoteReaction>;
 export type NoteThreadMutingsRepository = Repository<MiNoteThreadMuting> & MiRepository<MiNoteThreadMuting>;
-export type NoteUnreadsRepository = Repository<MiNoteUnread> & MiRepository<MiNoteUnread>;
 export type PagesRepository = Repository<MiPage> & MiRepository<MiPage>;
 export type PageLikesRepository = Repository<MiPageLike> & MiRepository<MiPageLike>;
 export type PasswordResetRequestsRepository = Repository<MiPasswordResetRequest> & MiRepository<MiPasswordResetRequest>;
@@ -266,5 +270,10 @@ export type RoleAssignmentsRepository = Repository<MiRoleAssignment> & MiReposit
 export type FlashsRepository = Repository<MiFlash> & MiRepository<MiFlash>;
 export type FlashLikesRepository = Repository<MiFlashLike> & MiRepository<MiFlashLike>;
 export type UserMemoRepository = Repository<MiUserMemo> & MiRepository<MiUserMemo>;
+export type ChatMessagesRepository = Repository<MiChatMessage> & MiRepository<MiChatMessage>;
+export type ChatRoomsRepository = Repository<MiChatRoom> & MiRepository<MiChatRoom>;
+export type ChatRoomMembershipsRepository = Repository<MiChatRoomMembership> & MiRepository<MiChatRoomMembership>;
+export type ChatRoomInvitationsRepository = Repository<MiChatRoomInvitation> & MiRepository<MiChatRoomInvitation>;
+export type ChatApprovalsRepository = Repository<MiChatApproval> & MiRepository<MiChatApproval>;
 export type BubbleGameRecordsRepository = Repository<MiBubbleGameRecord> & MiRepository<MiBubbleGameRecord>;
 export type ReversiGamesRepository = Repository<MiReversiGame> & MiRepository<MiReversiGame>;
diff --git a/packages/backend/src/models/json-schema/chat-message.ts b/packages/backend/src/models/json-schema/chat-message.ts
new file mode 100644
index 0000000000..44b7298702
--- /dev/null
+++ b/packages/backend/src/models/json-schema/chat-message.ts
@@ -0,0 +1,146 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const packedChatMessageSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		fromUserId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		fromUser: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'UserLite',
+		},
+		toUserId: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		toUser: {
+			type: 'object',
+			optional: true, nullable: true,
+			ref: 'UserLite',
+		},
+		toRoomId: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		toRoom: {
+			type: 'object',
+			optional: true, nullable: true,
+			ref: 'ChatRoom',
+		},
+		text: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		fileId: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		file: {
+			type: 'object',
+			optional: true, nullable: true,
+			ref: 'DriveFile',
+		},
+		isRead: {
+			type: 'boolean',
+			optional: true, nullable: false,
+		},
+		reactions: {
+			type: 'array',
+			optional: false, nullable: false,
+			items: {
+				type: 'object',
+				optional: false, nullable: false,
+				properties: {
+					reaction: {
+						type: 'string',
+						optional: false, nullable: false,
+					},
+					user: {
+						type: 'object',
+						optional: true, nullable: true,
+						ref: 'UserLite',
+					},
+				},
+			},
+		},
+	},
+} as const;
+
+export const packedChatMessageLiteSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		fromUserId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		fromUser: {
+			type: 'object',
+			optional: true, nullable: false,
+			ref: 'UserLite',
+		},
+		toUserId: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		toRoomId: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		text: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		fileId: {
+			type: 'string',
+			optional: true, nullable: true,
+		},
+		file: {
+			type: 'object',
+			optional: true, nullable: true,
+			ref: 'DriveFile',
+		},
+		reactions: {
+			type: 'array',
+			optional: false, nullable: false,
+			items: {
+				type: 'object',
+				optional: false, nullable: false,
+				properties: {
+					reaction: {
+						type: 'string',
+						optional: false, nullable: false,
+					},
+					user: {
+						type: 'object',
+						optional: true, nullable: true,
+						ref: 'UserLite',
+					},
+				},
+			},
+		},
+	},
+} as const;
diff --git a/packages/backend/src/models/json-schema/chat-room-invitation.ts b/packages/backend/src/models/json-schema/chat-room-invitation.ts
new file mode 100644
index 0000000000..204c959b2c
--- /dev/null
+++ b/packages/backend/src/models/json-schema/chat-room-invitation.ts
@@ -0,0 +1,37 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const packedChatRoomInvitationSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		userId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		user: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'UserLite',
+		},
+		roomId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		room: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'ChatRoom',
+		},
+	},
+} as const;
diff --git a/packages/backend/src/models/json-schema/chat-room-membership.ts b/packages/backend/src/models/json-schema/chat-room-membership.ts
new file mode 100644
index 0000000000..adb73f9dde
--- /dev/null
+++ b/packages/backend/src/models/json-schema/chat-room-membership.ts
@@ -0,0 +1,37 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const packedChatRoomMembershipSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		userId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		user: {
+			type: 'object',
+			optional: true, nullable: false,
+			ref: 'UserLite',
+		},
+		roomId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		room: {
+			type: 'object',
+			optional: true, nullable: false,
+			ref: 'ChatRoom',
+		},
+	},
+} as const;
diff --git a/packages/backend/src/models/json-schema/chat-room.ts b/packages/backend/src/models/json-schema/chat-room.ts
new file mode 100644
index 0000000000..e97556e378
--- /dev/null
+++ b/packages/backend/src/models/json-schema/chat-room.ts
@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const packedChatRoomSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		ownerId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		owner: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'UserLite',
+		},
+		name: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		description: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		isMuted: {
+			type: 'boolean',
+			optional: true, nullable: false,
+		},
+	},
+} as const;
diff --git a/packages/backend/src/models/json-schema/role.ts b/packages/backend/src/models/json-schema/role.ts
index 3537de94c8..1685a806c9 100644
--- a/packages/backend/src/models/json-schema/role.ts
+++ b/packages/backend/src/models/json-schema/role.ts
@@ -292,6 +292,10 @@ export const packedRolePoliciesSchema = {
 			type: 'boolean',
 			optional: false, nullable: false,
 		},
+		canChat: {
+			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 38631f907d..b10430782b 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -358,6 +358,11 @@ export const packedUserDetailedNotMeOnlySchema = {
 			nullable: false, optional: false,
 			enum: ['public', 'followers', 'private'],
 		},
+		chatScope: {
+			type: 'string',
+			nullable: false, optional: false,
+			enum: ['everyone', 'following', 'followers', 'mutual', 'none'],
+		},
 		roles: {
 			type: 'array',
 			nullable: false, optional: false,
@@ -540,6 +545,10 @@ export const packedMeDetailedOnlySchema = {
 			type: 'boolean',
 			nullable: false, optional: false,
 		},
+		hasUnreadChatMessages: {
+			type: 'boolean',
+			nullable: false, optional: false,
+		},
 		hasUnreadNotification: {
 			type: 'boolean',
 			nullable: false, optional: false,