The controller self-updates daily at 04:30 by default, and after any hub report
once a floor sits above the box. That swap restarts the controller container.
The window proposed for automatic app updates is 02:30-05:00. It contains 04:30.
R-608 — a two-way lock, wired in main.go (stacks never imports selfupdate):
- stacks.Manager.AnyUpdating() -> Updater.SetAppUpdatingCheck, consulted in the
same three places as the existing backupRunning gate.
- Updater.IsUpdateRunning -> Manager.SetSelfUpdatingCheck; UpdatePreflight
refuses `self_updating`.
- MEASURED: the gap was narrower than assumed. The update's `backing-up` phase
already takes the backup single-flight, so that one phase was covered. The
other six were not, and `starting`/`verifying` are where data may have moved.
- The lock must NOT latch: a held app does not block the controller's own
updates, including the release that might fix the hold.
R-609 — the 409 carries `data.reason`, additively. transient (busy, updating,
deploying, migrating, self_updating) vs terminal (held, downgrade). Found while
writing the test: the router refuses a HELD app on its own line before the
preflight, so `held` would have been the one reason missing.
Five red-proofs, each seen to fail.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
