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sencho/backend
Anso 55ca82abb2 perf(statuses): align stack-status cache TTL and invalidation with polling (#1814)
The 3s stack-statuses cache TTL never survived the 10s dashboard poll, so
every ordinary poll recomputed. Raise the TTL to 15s and move the git-source
label and self-identity enrichment inside the cached payload so cache hits
serve fully decorated statuses with zero per-request work.

Invalidation closes the gaps the longer TTL would otherwise widen:

- DockerEventService drops stack-statuses:<nodeId> on container state events
  so the UI's state-invalidate refetch recomputes instead of hitting a stale
  entry. The narrow key only: container events do not reshape stack identity
  or file roots, and the stats key self-refreshes on its own 2s TTL.
- git-source link and unlink invalidate node caches before responding, so the
  source label stays fresh without waiting for the TTL.
- a payload whose enrichment degraded (identity probe failure or git-source
  scan failure) is never cached, so a mislabeled not-self or 'local' badge
  cannot persist for a full TTL window. Running outside Docker is not
  degradation, so host installs cache normally.
2026-08-09 23:13:59 -04:00
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