Add lesson: upsert with ON CONFLICT#16
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Covers INSERT … ON CONFLICT DO UPDATE / DO NOTHING, the EXCLUDED pseudo-table, conditional updates with a WHERE on the UPDATE branch, and the idempotent-insert use case. Three checks exercise both the update and insert paths plus DO NOTHING. Part of #6. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
07-upsert(module-relative03-upsert).INSERT … ON CONFLICT DO UPDATE(with theEXCLUDEDpseudo-table), the insert-path of the same statement,DO NOTHINGfor idempotent inserts, and a conditionalWHEREon the UPDATE branch.Note: this PR uses module-relative slot
03-assuming #15 (02-delete-and-lifecycle) lands first. The validator allows gaps in lesson order, so this can also merge independently — if it lands first, there's just a01/03gap in module 2 until #15 fills it.Part of #6.
Test plan
npm run lessons:validatenpx tsc --noEmitnpm run lint/lessons/07-upsert/previewand verify each<Run>works against the seed🤖 Generated with Claude Code