protected function addChange($addressBookId, $objectUri, $operation)
    {
        $stmt = $this->pdo->prepare('INSERT INTO '.$this->addressBookChangesTableName.' (uri, synctoken, addressbookid, operation) SELECT ?, synctoken, ?, ? FROM '.$this->addressBooksTableName.' WHERE id = ?');
        $stmt->execute([
            $objectUri,
            $addressBookId,
            $operation,
            $addressBookId,
        ]);
        $stmt = $this->pdo->prepare('UPDATE '.$this->addressBooksTableName.' SET synctoken = synctoken + 1 WHERE id = ?');
        $stmt->execute([
            $addressBookId,
        ]);
    }