public function unsetAllUserSettings($user_guid)
{
$db_prefix = _elgg_services()->configTable->get('dbprefix');
$ps_prefix = _elgg_namespace_plugin_private_setting('user_setting', '', $this->getID());
$q = "DELETE FROM {$db_prefix}private_settings\n\t\t\tWHERE entity_guid = {$user_guid}\n\t\t\tAND name LIKE '{$ps_prefix}%'";
return $this->getDatabase()->deleteData($q);
}