public void writeArchiveUris(ArchiveUris archiveUris) {
        byte[] data = ArchiveUriSerializer.toJson(archiveUris);
        NestedTransaction transaction = new NestedTransaction();
        CuratorTransaction curatorTransaction = db.newCuratorTransactionIn(transaction);
        curatorTransaction.add(CuratorOperations.setData(archiveUrisPath.getAbsolute(), data));
        transaction.commit();
    }
Returns the instant after which a firmware check is required, if any.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java