pub const OUTBOX_ABSOLUTE_LIFETIME_FACTOR: i32 = 4;Expand description
Absolute cap on a restored outbox entry’s total lifetime, as a multiple
of outbox_max_lifetime_ms, measured from first_sent_at.
The restore path refreshes the carrier-relative TTL of an entry that
lapsed while the process was down (restart ⇒ fresh delivery window).
Without an absolute bound, an app used briefly once past each lifetime
keeps re-granting the entry a fresh window forever, so “expiry is
terminal” would only hold in-process. Past this cap the entry is dropped
at restore with a terminal message_failed instead of refreshed
(4 × 7 days = 28 days at the default lifetime).