fix & update test config

src/utils/database/connection.py

@@ -12,7 +12,8 @@ def connetti_db(cfg: object) -> object:
     Establishes a synchronous connection to a MySQL database.
 
     DEPRECATED: Use connetti_db_async() for async code.
-    This function is kept for backward compatibility with old_scripts only.
+    This function is kept for backward compatibility with synchronous code
+    (e.g., ftp_csv_receiver.py which uses pyftpdlib).
 
     Args:
         cfg: A configuration object containing database connection parameters.