ページにいいねできるように

src/models/entities/page-like.ts

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+import { PrimaryColumn, Entity, Index, JoinColumn, Column, ManyToOne } from 'typeorm';
+import { User } from './user';
+import { id } from '../id';
+import { Page } from './page';
+
+@Entity()
+@Index(['userId', 'pageId'], { unique: true })
+export class PageLike {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Column('timestamp with time zone')
+	public createdAt: Date;
+
+	@Index()
+	@Column(id())
+	public userId: User['id'];
+
+	@ManyToOne(type => User, {
+		onDelete: 'CASCADE'
+	})
+	@JoinColumn()
+	public user: User | null;
+
+	@Column(id())
+	public pageId: Page['id'];
+
+	@ManyToOne(type => Page, {
+		onDelete: 'CASCADE'
+	})
+	@JoinColumn()
+	public page: Page | null;
+}