In ca_model_def table, the last_update_user and last_update_date fields are updated when a new model is created but not creation_date and creation_user.
Steps:
1. Create a new CMDB Model called 'test' in GUI and save.
2. Run the query select * from ca_model_def where name = 'test' in DB and we see that creation_user and creation_date are NULL where as last_update_user and date are updated.
CA Service Desk Manager 17.x