const TOMBSTONE_DAYS: i64 = SILENT_DAYS; // 180i64Expand description
Entries taken out are remembered this long, so an old copy does not bring
them back, and each full round restates them (new_round): as long as a
device may be away and still count (SILENT_DAYS). A device you forgot,
or one another replaces, no longer holds the others’ rounds back; back
within that time, it counts again and reads from a full round, which
must still say what was taken out meanwhile (but the lines of the logs
every device ages out by itself: AGED_TOMBSTONE_DAYS). Until 17 October
2026 it was 90 days, and such a device back after more than 90 days kept
for good what the others had taken out (review of 17 October 2026, M1).