Revert "feat: 個人宛てお知らせ機能 (#107)"

This reverts commit 7b1efd6b97.

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

@@ -38,19 +38,6 @@ export class Announcement {
 	})
 	public imageUrl: string | null;
 
-	@Index()
-	@Column('varchar', {
-		...id(),
-		nullable: true,
-	})
-	public userId: string | null;
-
-	@Column('integer', {
-		nullable: false,
-		default: 0,
-	})
-	public closeDuration: number;
-
 	constructor(data: Partial<Announcement>) {
 		if (data == null) return;