public function updateLastAdminActivity()
{
$now = \Yii::$app->formatter->asTimestamp(time());
if (!$this->lastAdminActivityAgo || $this->lastAdminActivityAgo > 10) {
$this->last_activity_at = $now;
$this->last_admin_activity_at = $now;
$this->save(false);
}
return $this;
}