static public function deleteRelated($obj=NULL)
{
if (!is_null($obj)) {
$subscriptions = Subscription::getAll($obj->getCheckId());
foreach ($subscriptions as $subscription) {
$subscription->delete();
}
$check_results = CheckResult::getAll($obj->getCheckId());
foreach ($check_results as $check_result) {
$check_results->delete();
}
}
}
