test

    uint64_t store(const uint8_t* data, size_t data_len);

    uint64_t store(const std::vector<uint8_t>& data);

    // Store with a caller-supplied group_id (deterministic key)

    // Prepends an 8-byte length header so retrieve can strip padding

    void store(uint64_t group_id, const uint8_t* data, size_t data_len);

    void store(uint64_t group_id, const std::vector<uint8_t>& data);

    // Retrieve data: fetches blocks from nodes, reconstructs if needed

    // original_size: original data size before padding

    std::vector<uint8_t> retrieve(uint64_t group_id, size_t original_size);

    // Retrieve with automatic size detection (reads 8-byte length header)

    std::vector<uint8_t> retrieve(uint64_t group_id);

    // Delete all blocks for a group from all nodes

    void remove(uint64_t group_id);