PBS rewrites index.json.blob inside a snapshot directory at every verify
(the next 02:30, then every 30 days per verification.cfg outdated-after 30)
and on notes/protect edits, which moves the directory mtime forward.
Measured: ana-pve/vm/101's 2026-10-04T10:00:04Z snapshot read as 2026-10-06.
A covered guest whose backups stopped would have alarmed up to a day late,
then gone quiet for ~2 days after each monthly re-verify.
The age now comes from the snapshot name (its backup start time).
Verified: the default run exits 0 with 28 fresh PBS groups and vm/101 dated
2026-10-04. Positive control BACKUP_MAX_AGE_HOURS=5 flags 10 groups by name
age, exit 1.
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