Constant AGED_TOMBSTONE_DAYS 

const AGED_TOMBSTONE_DAYS: i64 = 90;

The lines of the logs every device ages out by itself (ages_out) taken out are remembered this long, past the longest one of them keeps a line anywhere (its writer KEPT_DAYS, the others LATE_DAYS more): a line older than that is never shown and goes by itself on a device back after longer. They are many, a line for each call and for each message of the phone’s, each a few hundred bytes (a message’s padded), its whole line its name, and each full round restates them: 90 days, as before 17 October 2026.