feat: チャンネルにノートをピン留めできるように

Resolve #7740

packages/backend/src/models/entities/Channel.ts

@@ -59,6 +59,11 @@ export class Channel {
 	@JoinColumn()
 	public banner: DriveFile | null;
 
+	@Column('varchar', {
+		array: true, length: 128, default: '{}',
+	})
+	public pinnedNoteIds: string[];
+
 	@Index()
 	@Column('integer', {
 		default: 0,

packages/backend/src/models/entities/ChannelNotePining.ts

@@ -1,35 +0,0 @@
-import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
-import { id } from '../id.js';
-import { Note } from './Note.js';
-import { Channel } from './Channel.js';
-
-@Entity()
-@Index(['channelId', 'noteId'], { unique: true })
-export class ChannelNotePining {
-	@PrimaryColumn(id())
-	public id: string;
-
-	@Column('timestamp with time zone', {
-		comment: 'The created date of the ChannelNotePining.',
-	})
-	public createdAt: Date;
-
-	@Index()
-	@Column(id())
-	public channelId: Channel['id'];
-
-	@ManyToOne(type => Channel, {
-		onDelete: 'CASCADE',
-	})
-	@JoinColumn()
-	public channel: Channel | null;
-
-	@Column(id())
-	public noteId: Note['id'];
-
-	@ManyToOne(type => Note, {
-		onDelete: 'CASCADE',
-	})
-	@JoinColumn()
-	public note: Note | null;
-}