ItemSortTable::getMaxSort

static function getMaxSort(int $userId, Stage $stage): int
{
	$items = $stage->getUserSortedItems([
		'order' => [
			'USORT' => 'DESC',
		],
		'filter' => [
			'!USORT' => null,
		],
		'limit' => 1,
	], $userId);
	foreach($items as $item)
	{
		return $item->get('USER_SORT')->get('SORT');
	}

	return static::DEFAULT_MAX_SORT;
}