Closes the chicken-and-egg where `restore_allow_force` (and its
auto-upgrade tracking flag) got overwritten on every restore by
whatever value happened to be in the backup. Net effect:
1. Admin enables Force Restore (via tonight's default-ON migration
edit, or hand-SQL on older installs).
2. Restore runs successfully.
3. Restored DB has `restore_allow_force = <backup's old value>`.
4. Next restore attempt: "Force restore is not allowed by system
settings" — admin needs the SQL workaround AGAIN.
Cure: snapshot a small list of operator-meta keys BEFORE the DROP
DATABASE (while we still have a working pool against the OLD DB),
then UPSERT them back AFTER the psql restore + migrate.latest.
The preserved set is intentionally narrow — currently just
`restore_allow_force` and `restore_allow_force_auto_upgraded`. These
are about how the operator wants the install to behave, not user-
facing state. Adding more keys is a one-line addition to the
PRESERVED_META_KEYS constant.
Survives both:
- backup is OLDER than the operator's most recent setting change
- backup is NEWER but had a different operator policy
Either way, the post-restore install reflects the LIVE operator
policy, not the backup's snapshot of it.
Luca
e0ace0864e