private function deleteRow(int $parentId, string $textMD5): int
    {
        $queryBuilder = $this->connection->createQueryBuilder();
        $expr = $queryBuilder->expr();
        $queryBuilder
            ->delete($this->table)
            ->where(
                $expr->andX(
                    $expr->eq(
                        'parent',
                        $queryBuilder->createPositionalParameter($parentId, ParameterType::INTEGER)
                    ),
                    $expr->eq(
                        'text_md5',
                        $queryBuilder->createPositionalParameter($textMD5)
                    )
                )
            );

        return $queryBuilder->execute();
    }