Hi All, I noticed the nova DB has reservations table with an expire field (+24h) and a periodic task in the scheduler (60 sec) for expire the otherwise not deleted records . Both the table and the observed operations are strange. What this table and its operations are trying to solve ? Why does it needed ? Why this solution was chosen ?  https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/models.py#L531  https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/api.py#L3725 PS.: Is the uuid in the table referenced by anything?