DeleteService::getPreviousMessageId

private function getPreviousMessageId(): int
{
	if (isset($this->previousMessageId))
	{
		return $this->previousMessageId;
	}

	$result = MessageTable::query()
		->setSelect(['ID'])
		->where('CHAT_ID', $this->chat->getChatId())
		->where('ID', '<', $this->message->getMessageId())
		->setOrder(['ID' => 'DESC'])
		->setLimit(1)
		->fetch()
	;
	$this->previousMessageId = ($result && isset($result['ID'])) ? (int)$result['ID'] : 0;

	return $this->previousMessageId;
}