public function markBanned($guid, $banned)
{
$query = "\n\t\t\tUPDATE {$this->table}\n\t\t\tSET banned = :banned\n\t\t\tWHERE guid = :guid\n\t\t";
$params = [':banned' => $banned ? 'yes' : 'no', ':guid' => (int) $guid];
return $this->db->updateData($query, true, $params);
}