Add lesson: deleting rows and row lifecycle#15
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Covers DELETE with predicates and RETURNING, foreign-key interactions, TRUNCATE (including RESTART IDENTITY), and the soft-delete pattern that most production apps actually use. Part of #6. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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This was referenced May 28, 2026
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Summary
06-delete-and-lifecycle(module-relative02-delete-and-lifecycle).DELETEwith predicates andRETURNING, foreign-key interactions (ON DELETE CASCADE/SET NULL/NO ACTION),TRUNCATEsemantics (noWHERE, transactional,RESTART IDENTITY), and the soft-delete pattern withdeleted_at timestamptz.Part of #6.
Test plan
npm run lessons:validatenpx tsc --noEmitnpm run lint/lessons/06-delete-and-lifecycle/previewand verify each<Run>works against the seed🤖 Generated with Claude Code