/**
  * Remove a campaign from the database
  *
  * @param $campaignName string: Name of the campaign
  * @param $user User removing the campaign
  *
  * @return bool|string True on success, string with message key for error
  */
 static function removeCampaign($campaignName, $user)
 {
     $dbr = PRDatabase::getDb();
     $res = $dbr->select('pr_campaigns', 'cmp_name', array('cmp_name' => $campaignName));
     if ($dbr->numRows($res) < 1) {
         return 'promoter-remove-campaign-doesnt-exist';
     }
     AdCampaign::removeCampaignByName($campaignName, $user);
     return true;
 }