test

    ClusterBackend::ClusterBackend(const char *domain, size_t version, const char *filepath)

        : _Domain(domain), _Pos(0), _Dirty(false)

    {

        // Try to fetch existing data from cluster/store (retry a few times on startup)

        for (int attempt = 0; attempt < 3 && _Buffer.empty(); ++attempt) {

            if (attempt > 0)

                std::this_thread::sleep_for(std::chrono::seconds(attempt));

        // Try to fetch existing data from cluster (single attempt, non-blocking).

        // If peers aren't reachable yet, lock() will fetch on first use.

        fetchFromCluster();

        }

        if (_Buffer.empty()) {

            // Initialize with a fresh header locally.