fix(refund): add error code in refund table (#427)

crates/storage_models/src/schema.rs

@@ -322,6 +322,7 @@ diesel::table! {
         refund_status -> RefundStatus,
         sent_to_gateway -> Bool,
         refund_error_message -> Nullable<Text>,
+        refund_error_code -> Nullable<Varchar>,
         metadata -> Nullable<Json>,
         refund_arn -> Nullable<Varchar>,
         created_at -> Timestamp,