The canonical upsert path skips validateLifeDates, so a spreadsheet row
with birth_year > death_year - or a preserved hand-entered birth date
conflicting with a canonical death year - violated the V76 CHECK
constraint at flush time and aborted the whole import batch with a raw
500. Resolve the pairs first and, on conflict, keep the person's stored
life dates (empty for a new person), drop the canonical refresh, and log
a WARN with the sourceRef (REQ-IMP-001: never abort the batch).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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