make drive_file.comment larger

we can change the 8192 to something else, but 512 is too short ☺

packages/backend/src/models/DriveFile.ts

@@ -67,7 +67,8 @@ export class MiDriveFile {
 	public size: number;
 
 	@Column('varchar', {
-		length: 512, nullable: true,
+		length: 8192,
+		nullable: true,
 		comment: 'The comment of the DriveFile.',
 	})
 	public comment: string | null;