feat: Implement singleflight for deduplicating concurrent cache misses #1889
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Note
Medium Risk
Touches shared caching behavior used across the API and changes concurrency/timing semantics (singleflight + callback timeouts), which could alter load patterns or failure modes under contention.
Overview
Updates the shared
cache.Cacheto deduplicate concurrent cache-miss fetches viasingleflight, adds a configurableCallbackTimeoutand makes miss fetches resilient to caller context cancellation, then propagates the new cache generics/signature changes to API auth/template caches and extends tests to cover the new concurrency and timeout behavior.Written by Cursor Bugbot for commit 1798414. This will update automatically on new commits. Configure here.