private function processCleanup($date) {
        // Run daily.
        $lastjob = JobFinder::getLastByQuery(['type' => Cleanup_Job::$TYPE]);
        if(is_null($lastjob) || $date - $lastjob['target_date'] >= 24 * 60 * 60 - 5) {
            $cleanupjob = new Cleanup_Job();