table User (string user_id = 1) @ 1 {
    uint64 registered = 2;
    object password = 3 {
        string algo = 1;
        bytes salt = 2;
        bytes hash = 3;
    };
    map string threads = 4 {
        join thread = 1 on Thread(threads);
    };
    map string sessions = 5 {
        breakout uint64 expires_us = 1;
    };
}

table Thread (string thread_id = 1) @ 2 {
    uint64 posted_us = 2;
    string parent = 3;
    string body = 4;
    map string upvotes = 5 {
        uint64 time_us = 1;
    };
}

table Inbox (string user_id = 1) @ 3 {
    map sfixed64 messages = 2 {
    };
}