Markus flagged the 0/10 range was duplicated across five sites (DB
CHECK, both importers, DTO @Min/@Max, dropdown range). New
PersonGeneration.MIN_GENERATION / MAX_GENERATION constants are now
the canonical Java source; the DTO annotations and both importer
guards reference them. The V70 SQL CHECK comment now points at the
Java constants so future widening updates one Java class plus one
SQL literal (Flyway forbids rewriting the migration in place).
Refs #689
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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