ActCounterLightTimeRepo::queryLightTimeByActivityId

public function queryLightTimeByActivityId(int $activityId): ?DateTime
{
	$row = ActCounterLightTimeTable::query()
		->addSelect('LIGHT_COUNTER_AT')
		->where('ACTIVITY_ID', '=', $activityId)
		->fetch();

	if ($row === false || empty($row['LIGHT_COUNTER_AT']))
	{
		return null;
	}
	return $row['LIGHT_COUNTER_AT'];
}