public function clear($log)
    {
        if ($log === 'change') {
            $this->changeRepository->clearLog();
        } elseif ($log === 'system') {
            $this->systemRepository->clearLog();
        } else {
            throw new \UnexpectedValueException("Invalid log type requested: $log");
        }

        $this->app['logger.system']->info(ucfirst($log) . ' log cleared.', ['event' => 'security']);
    }