public function up(): void 	{ 		Schema::table('customers', static function (Blueprint $table): void { 			$table->char('pin', 4)->unique(); 			$table->string('phone', 20)->nullable(); 			$table->string('position', 50)->nullable(); 			$table->uuid('warehouse_id')->nullable(); 			$table->foreign('warehouse_id', 'customers_warehouse_id_foreign')->references('id')->on('warehouses')->nullOnDelete(); 		}); 	}