public function up(): void 	{ 		Schema::create('notification_targets', static function (Blueprint $table): void { 			$table->uuid('id')->primary(); 			$table->foreignUuid('notification_id')->constrained('notifications')->cascadeOnDelete(); 			$table->foreignUuid('user_id')->constrained('users')->cascadeOnDelete(); 			$table->dateTime('seen_at')->nullable(); 			$table->timestamps(); 			$table->index(Model::CREATED_AT); 		}); 	}