test

    // Returns number of nodes that completed vacuum successfully.

    size_t vacuum_all_nodes();

    // Mark a node as dead (skip it for the cooldown period)

    void mark_node_dead(size_t node_index);

    // Designate a node index as "local" — bypass QUIC, use block_store directly

    void set_local_node(size_t node_index, std::shared_ptr<block_store> store);