protected function deleteExpiredRecords()
    {
        try {
            $limit = (int)($this->limitDuration);
        } catch (\Exception $ex) {
            Yii::error($ex->getMessage(), __METHOD__);
            return 0;
        }
        $count = 0;
        $host = $this->host;
        /* @var $host \rhosocial\user\User */
        foreach (static::find()
                ->createdBy($host)
                ->andWhere(['<=', $this->createdAtAttribute, $this->offsetDatetime($this->currentUtcDatetime(), -$limit)])
                ->all() as $login) {
            /* @var $login static */
            $result = $login->delete();
            $count += $result;
            if (YII_ENV_DEV) {
                Yii::info($host->getReadableGUID() . ": ($result) login record created at (" . $login->getCreatedAt() . ") was just deleted.", __METHOD__);
            }
        }
        return $count;
    }