public function start($id_cron): bool
  {
    $res = false;
    if ( $this->check() && ($cron = $this->get_cron($id_cron)) ){
      bbn\appui\history::disable();
      $start = date('Y-m-d H:i:s');
      if ( $this->db->update($this->table, [
        'prev' => $start,
        'next' => date('Y-m-d H:i:s', $this->get_next_date($cron['cfg']['frequency']))
      ], [
        'id' => $id_cron
      ]) ){
        $res = true;
      }
      bbn\appui\history::enable();
    }
    return $res;
  }