diff --git a/backend_api_python/app/routes/auth.py b/backend_api_python/app/routes/auth.py
index f25c195..0c4f8b4 100644
--- a/backend_api_python/app/routes/auth.py
+++ b/backend_api_python/app/routes/auth.py
@@ -379,9 +379,14 @@ def login_with_code():
                     (user['id'],)
                 )
                 db.commit()
+                affected = cur.rowcount
                 cur.close()
+                if affected == 0:
+                    logger.error(f"Failed to update last_login_at: no rows affected for user_id={user['id']}")
+                else:
+                    logger.info(f"Updated last_login_at for user_id={user['id']}")
         except Exception as e:
-            logger.warning(f"Failed to update last_login_at: {e}")
+            logger.error(f"Failed to update last_login_at for user_id={user.get('id')}: {e}")
         
         # Log login
         security.log_security_event('login_via_code', user['id'], ip_address, user_agent)
diff --git a/backend_api_python/app/services/user_service.py b/backend_api_python/app/services/user_service.py
index ecd0004..58d3b0b 100644
--- a/backend_api_python/app/services/user_service.py
+++ b/backend_api_python/app/services/user_service.py
@@ -170,9 +170,14 @@ class UserService:
                     (user['id'],)
                 )
                 db.commit()
+                affected = cur.rowcount
                 cur.close()
+                if affected == 0:
+                    logger.error(f"Failed to update last_login_at: no rows affected for user_id={user['id']}")
+                else:
+                    logger.info(f"Updated last_login_at for user_id={user['id']}")
         except Exception as e:
-            logger.warning(f"Failed to update last_login_at: {e}")
+            logger.error(f"Failed to update last_login_at for user_id={user.get('id')}: {e}")
         
         # Remove password_hash from return value
         user.pop('password_hash', None)