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a96c8381f7
getPricingForModel() called the uncached getPricing() on every invocation instead of the existing getCachedPricing() helper (30s TTL, readCache.ts), so usageStats.getUsageStats() re-ran a 3-SELECT + JSON.parse + merge cycle against key_value once per GROUP BY row -- up to 531 times on a large usage_history table -- blocking the event loop for several seconds on /api/usage/history. Every known pricing writer (updatePricing, LiteLLM/models.dev sync) already invalidates this cache via touchPricing()/invalidateDbCache, so a write remains immediately visible; added a regression test that proves both the cache hit path and the invalidation path.