Function lost_line 

fn lost_line(
    read_n: Option<(u32, u64)>,
    round: u32,
    good: Option<(u64, Option<u64>)>,
    next: Option<&[u8]>,
    now_ms: i64,
) -> Option<i64>

A line of another computer’s round lost here (it does not read, or does not open): when its computer wrote it, at the latest, in seconds (the clock of the line after it, else now; never the line before it, which may be days older: review of 10 October 2026, S2-A), for the doses’ doubt (Memory::broken). None when it was met before: a line after it was read already (read_n), and this reading goes over the round again (a store joining, a record rebuilt): said once, never stamped anew. good: the last line of the round that opened in this reading, its number and clock (none for where an earlier reading stopped).