RelationCollection::getStartId

static function getStartId(int $userId, int $chatId): int
{
	if (isset(self::$startIdStaticCache[$chatId][$userId]))
	{
		return self::$startIdStaticCache[$chatId][$userId];
	}

	$relation = static::find(['CHAT_ID' => $chatId, 'USER_ID' => $userId], [], 1)->getByUserId($userId, $chatId);

	if ($relation === null)
	{
		return 0;
	}

	return $relation->getStartId() ?? 0;
}