function cleanup()
 {
     global $serendipity;
     TwitterPluginDbAccess::install($this);
     // Save highest twitter id of all ids saved for single articles
     $highest_id_single = TwitterPluginDbAccess::find_highest_twitterid();
     if ($this->get_config('highest_id_global', '0') < $highest_id_single) {
         $this->set_config('highest_id_global', TwitterPluginDbAccess::find_highest_twitterid());
     }
     // patch old config
     if ('default' == $this->get_config('tweetback_moderate')) {
         $this->set_config('tweetback_moderate', 'approved');
     }
     if ('snipr' == $this->get_config('anounce_url_service')) {
         $this->set_config('7ax');
     }
     $this->check_tweetbacks_global(true);
 }