fix(server): マイグレーションad1676438468213が通らないのを修正 (#9963)

* fix(server): マイグレーションad1676438468213が通らないのを修正
Fix #9962

* fix

packages/backend/migration/1676438468213-ad3.js

 export class ad1676438468213 {
 	name = 'ad1676438468213';
 	async up(queryRunner) {
-			await queryRunner.query(`ALTER TABLE "ad" ADD "startsAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
+			await queryRunner.query(`ALTER TABLE "ad" ADD "startsAt" TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()`);
 	}
 	async down(queryRunner) {
 		await queryRunner.query(`ALTER TABLE "role" DROP COLUMN "startsAt"`);

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

@@ -21,6 +21,7 @@ export class Ad {
 	@Index()
 	@Column('timestamp with time zone', {
 		comment: 'The expired date of the Ad.',
+		default: () => 'now()',
 	})
 	public startsAt: Date;