Files
ScadaBridge/docs/plans
Joseph Doherty a16b7b4e65 fix(central): audit per-node central caches; management API drops ApiMethodCache entries (ScadaBridge#85)
Audit (docs/plans/2026-11-09-central-cache-staleness-audit.md) of every central in-process
cache holding configuration or secret state, with its staleness bound on the peer central
node. Every config cache with peer staleness is TTL-bounded (5-60 s) and Traefik routes to the
active node only, so no peer case was clearly a bug and no cross-node broadcast is added; the
doc names the existing DistributedPubSub mediator (health replication topic) as the mechanism
if one is wanted. Owner decisions listed: RoleMappingCache 30 s revocation lag on the peer,
SitePskProvider caching a PSK forever across an in-place rotation (both nodes), and the #83
ExternalDefinitionLookupCache 10 s bound.

Fixed: ManagementActor API-method create/update/delete invalidated only the compiled handler,
not ApiMethodCache, so the node that made the change kept serving the pre-change row for up to
the 5 s TTL (a deleted method stayed callable; a cached not-found hid a new one). The handlers
now drop the entry post-commit, like the role-mapping cache.

Tests: ApiMethodCacheInvalidationTests (create/update/delete fail without the fix; a
negative control checks other methods stay cached).

(ScadaBridge#85)

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV
2026-11-09 13:54:29 -05:00
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