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One line. Many voicesSeek and you shall find

posthog.com faviconKarpathy's Autoresearch found a 3-year-old bug in our query engine (and improved performance by 11%) - PostHog

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PostHog used a Karpathy-style AI agent to find a 3-year-old ClickHouse bug where `toTimeZone()` disabled primary key usage, and the fix cut query time by 37%