// something like cron-job to delete wasteful/old data from db
$this->dbObj->sqlSet("delete FROM {$this->_prefix}etchat_messages where etchat_timestamp < ".(date('U')-($_SESSION['etchat_'.$this->_prefix.'loeschen_nach']*3600*24)));
$this->dbObj->sqlSet("delete FROM {$this->_prefix}etchat_blacklist where etchat_blacklist_time < ".date('U'));
$this->dbObj->sqlSet("delete FROM {$this->_prefix}etchat_kick_user where etchat_kicked_user_time < ".date('U'));