Diagnosis · Technical SEO · Next.js
A site lost 98% of its Google traffic overnight
Crawling was healthy, every page answered correctly, and Google still decided to stop sending anyone. Telling "Google cannot get in" apart from "Google gets in and decides you are not worth it" changed the whole plan.
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Data reliability · Batch jobs · NestJS
The batch job that said "complete" after reading 21% of the data
Exit code zero, green logs, and half a catalogue missing. The most expensive failure in a batch job is not the crash: it is the run that reports success on partial data.
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