Ensure database transaction is committed after list creation in the API endpoint; improve reliability of list creation process.

be/app/api/v1/endpoints/lists.py

@@ -61,6 +61,7 @@ async def create_list(
 
     try:
         created_list = await crud_list.create_list(db=db, list_in=list_in, creator_id=current_user.id)
+        await db.commit() # Ensure the transaction is committed
         logger.info(f"List '{created_list.name}' (ID: {created_list.id}) created successfully for user {current_user.email}.")
         return created_list
     except DatabaseIntegrityError as e: