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Nov 8, 2021 · Databases

When a Missing Index Cost $5,000: Lessons from a PlanetScale Mishap

An engineer’s oversight in a PlanetScale schema—omitting a foreign‑key‑based index—led to massive row‑scan costs, prompting a $5,000 bill, while the article also critiques junior developers’ naive schema designs and offers advice on proper database indexing and mentorship.