Bounded legacy auth fallback cache

Legacy auth fallback now caches negative results to avoid hammering the upstream identity provider.

Legacy auth fallback now caches both positive and negative results with a short TTL, preventing repeated upstream identity-provider calls on cold cache or token-rotation spikes.

authcachelegacy

Commitsf40c390

Related changes

2026-04-10FixedAPI

Hardened search auth caching and CI gates

Search auth caching is bounded and CI gates catch regressions before merge.

2026-04-10ChangedAPI

Bounded public auth and trust timeout fallbacks

Public auth and trust requests now degrade to a fast structured fallback instead of hanging.

2026-04-10ChangedAPI

Hardened legacy API proxy transport

Legacy API proxy mode now retries transient transport errors before falling back to cached responses.