Final fix?

src/transaction-hub-in/trace-retrieval-microservice/app/routes/transactions.py

@@ -23,7 +23,8 @@ def delete_all_failed_for_use_case(use_case: str):
     return Response(status=200)
 
 def all_duplicated_for_use_case(use_case: str):
-    return _repository.all_duplicated_transactions_for_use_case(use_case)
+    transactions = _repository.all_duplicated_transactions_for_use_case(use_case)
+    return [t.to_serializable_dict() for t in transactions]
 
 def delete_all_duplicated_for_use_case(use_case: str):
     _repository.delete_all_duplicated_transactions(use_case)