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Notes, short on purpose.
Things I learned the hard way while building systems that have to keep working.
Refusal is an outcome
The most underrated path in a retrieval system is the one that does not answer.
A lease, not a heartbeat
How to make duplicate delivery and crashed workers boring, with one SQL statement.
Calibrate on data the model never saw
Why an interval labelled 90% can cover far less, and the small change that fixes it.