func (c *Cluster) ContainerLastUsedUpdate(id int, date time.Time) error {
	stmt := `UPDATE containers SET last_use_date=? WHERE id=?`
	err := exec(c.db, stmt, date, id)
	return err
}
func (c *Cluster) ContainerLastUsedUpdate(id int, date time.Time) error {
	stmt := `UPDATE containers SET last_use_date=? WHERE id=?`
	err := exec(c.db, stmt, date, id)
	return err
}
// ContainerLastUsedUpdate updates the last_use_date field of the container
// with the given ID.