なんかもうめっちゃ変えた

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

@@ -0,0 +1,43 @@
+import { Entity, Index, Column, PrimaryColumn } from 'typeorm';
+import { id } from '../id.js';
+
+@Entity()
+export class Announcement {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Announcement.',
+	})
+	public createdAt: Date;
+
+	@Column('timestamp with time zone', {
+		comment: 'The updated date of the Announcement.',
+		nullable: true,
+	})
+	public updatedAt: Date | null;
+
+	@Column('varchar', {
+		length: 8192, nullable: false,
+	})
+	public text: string;
+
+	@Column('varchar', {
+		length: 256, nullable: false,
+	})
+	public title: string;
+
+	@Column('varchar', {
+		length: 1024, nullable: true,
+	})
+	public imageUrl: string | null;
+
+	constructor(data: Partial<Announcement>) {
+		if (data == null) return;
+
+		for (const [k, v] of Object.entries(data)) {
+			(this as any)[k] = v;
+		}
+	}
+}