hermes update ran TWO separate pre-update backup mechanisms: the
config-gated full zip (updates.pre_update_backup, default off) and an
unconditional quick state snapshot added for #15733 that ignored the
user's setting entirely. On a large state.db (observed: 24 GB) the
'cheap' snapshot silently added ~60s to every update and ate 24 GB of
disk in state-snapshots/.
Now there is ONE mechanism, gated by updates.pre_update_backup with
three modes:
- quick (new default): state snapshot of critical small files (pairing
JSONs, cron jobs, config, auth, per-profile DBs). Files over 1 GiB
are skipped with a warning so a bloated state.db can never stall the
update again.
- full: the quick snapshot plus the HERMES_HOME zip (old 'true'
behavior; --backup forces it for one run).
- off: nothing runs — an explicit opt-out now disables the quick
snapshot too (--no-backup does the same per-run).
Legacy booleans are honored: true -> full, false -> off.
_run_pre_update_backup() now returns the quick-snapshot id so the
post-update cron-jobs restore safety net (#34600) keeps working; the
snapshot moved from the post-fetch site to the pre-mutation site,
which also covers the zip-fallback update path it previously missed.
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