function cleanDBonPurge()
{
global $DB;
$class = new Reminder_User();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new Entity_Reminder();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new Group_Reminder();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new Profile_Reminder();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new PlanningRecall();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
}