The Mindset of Debugging
summary
Sets a repeatable debugging process: observe, form a hypothesis, run an experiment, analyze, repeat. Walks through a concrete customer bug where contact phone updates sometimes fail because the code issues a SELECT without order by and a contact can have two phone rows; verifies requests via APM/logs, inspects DB with SQL and pghero, finds two rows, fixes by adding deterministic ordering or a unique constraint. Recommends 30–60 minute focused practice sessions.
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