diff --git a/app/services/auth_service.py b/app/services/auth_service.py
index 2e16a87f..413eb86b 100644
--- a/app/services/auth_service.py
+++ b/app/services/auth_service.py
@@ -74,8 +74,7 @@ class AuthService:
             )
 
             db.add(new_user)
-            db.commit()
-            db.refresh(new_user)
+            db.flush()
 
             logger.info(f"New user registered: {new_user.username}")
             return new_user
@@ -83,7 +82,6 @@ class AuthService:
         except UserAlreadyExistsException:
             raise  # Re-raise custom exceptions
         except Exception as e:
-            db.rollback()
             logger.error(f"Error registering user: {str(e)}")
             raise ValidationException("Registration failed")