Evalyst — Writing https://evalyst.ai/writing Essays on numbers you can believe: silent errors, the four states of an answer, and eval-gated analysis. en The dangerous answer isn't “I don't know.” It's “$0.”https://evalyst.ai/writing/free-null-zerohttps://evalyst.ai/writing/free-null-zeroSun, 09 Aug 2026 00:00:00 GMTA column called free, a year of NULLs, and a query that reported a year of revenue as zero without a single error. Why reviewing SQL can't catch a silent error — and what does.