public function up(): void 	{ 		Schema::table('products', function (Blueprint $table) { 			$table->dropUnique(['sku']);  			// drop the column alltogether 			$table->dropColumn(['sku']); 		});  		Schema::table('products', function (Blueprint $table) { 			$table->string('sku', 50);  			$table->unique(['sku', 'market_id'], 'products_sku_market_id_unique'); 		}); 	}