Refactor test cases for improved readability and consistency

- Adjusted function signatures in various test files to enhance clarity by aligning parameters.
- Updated patching syntax for better readability across test cases.
- Improved formatting and spacing in test assertions and mock setups.
- Ensured consistent use of async/await patterns in async test functions.
- Enhanced comments for better understanding of test intentions.

app/repositories/credit_transaction.py

@@ -91,8 +91,7 @@ class CreditTransactionRepository(BaseRepository[CreditTransaction]):
 
         """
         stmt = (
-            select(CreditTransaction)
-            .where(CreditTransaction.success == True)  # noqa: E712
+            select(CreditTransaction).where(CreditTransaction.success == True)  # noqa: E712
         )
 
         if user_id is not None: