pub fn carry_into(
own: &Path,
lines: &[Line],
now_ms: i64,
) -> Result<usize, String>Expand description
A phone’s new lines added to its own log (own), under its lock, read
again there: those not in it yet (by id), none past KEPT_DAYS (taken
out already, it would come back), each padded. Two processes adding at
once never write a line twice. Returns how many were written.