public function up(): void 	{ 		Schema::create('shipments', function (Blueprint $table): void { 			$table->uuid('id')->primary(); 			$table->uuid('order_id')->nullable(); 			$table->string('tracking_number', 50)->nullable(); 			$table->unsignedTinyInteger('shipping_provider')->default(0); 			$table->timestamps();  			$table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade'); 			$table->index(Model::CREATED_AT); 		}); 	}