public function up(): void 	{ 		Schema::table('customers', function (Blueprint $table) { 			$table->uuid('registered_from')->nullable(); 			$table->uuid('last_accessed_market')->nullable();  			$table->foreign('registered_from')->references('id')->on('markets')->nullOnDelete(); 			$table->foreign('last_accessed_market')->references('id')->on('markets')->nullOnDelete(); 		}); 	}