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67c0506290
The updateRateLimitUsageScript Lua script previously performed unconditional HINCRBYFLOAT on all usage counters without checking whether the rate limit window had expired. This caused usage to accumulate across window boundaries in Redis while the DB correctly reset on expiration, leading to incorrect 429 rate limiting that could persist for up to 24 hours. The Lua script now checks each window timestamp before incrementing: - If the window has expired, usage is reset to the current cost and the window timestamp is updated (matching DB-side semantics) - If the window is still valid, usage is accumulated normally This also resolves the async race condition where stale HINCRBYFLOAT tasks from the worker queue could pollute a freshly rebuilt cache after invalidation, since the script now self-corrects expired windows. Closes #1049