- fromCanonical writes the imported generation into a new Person row.
- mergeCanonical routes existing/canonical generation through the
existing preferHuman(Integer, Integer) overload so a human-edited
value is never overwritten on re-import (ADR-025).
- updatePerson writes generation verbatim from the form DTO so a human
can clear it back to null — same shape as birthYear/deathYear.
- createPerson(PersonUpdateDTO) writes generation so /persons/new flow
doesn't silently drop a selected G value on create.
Pinned with five tests covering the four write paths plus the
documenting test that captures preferHuman's known limitation
(explicit human null is overwritten by a non-null canonical value —
same as birthYear/deathYear, deferred to a future helper rework if it
ever produces a user-visible bug).
Refs #689
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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