なんかもうめっちゃ変えた

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

@@ -0,0 +1,42 @@
+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { id } from '../id.js';
+import { User } from './User.js';
+import { UserList } from './UserList.js';
+
+@Entity()
+@Index(['userId', 'userListId'], { unique: true })
+export class UserListJoining {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserListJoining.',
+	})
+	public createdAt: Date;
+
+	@Index()
+	@Column({
+		...id(),
+		comment: 'The user ID.',
+	})
+	public userId: User['id'];
+
+	@ManyToOne(type => User, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public user: User | null;
+
+	@Index()
+	@Column({
+		...id(),
+		comment: 'The list ID.',
+	})
+	public userListId: UserList['id'];
+
+	@ManyToOne(type => UserList, {
+		onDelete: 'CASCADE',
+	})
+	@JoinColumn()
+	public userList: UserList | null;
+}