public function up(): void 	{ 		Schema::create('product_specs_item_values', function (Blueprint $table): void { 			$table->uuid('id')->primary(); 			$table->json('name'); 			$table->uuid('specs_item_id'); 			$table->uuid('product_id');  			$table->timestamps();  			$table->foreign('specs_item_id')->references('id')->on('specs_items')->onDelete('cascade'); 			$table->foreign('product_id')->references('id')->on('products')->onDelete('cascade'); 			$table->index(Model::CREATED_AT); 		}); 	}