Documents the root cause of the timezone collapse bug and how to avoid it
in future data imports. Covers:
- group as the dedup identity key (not a display label), per lookup type
- correct way to add/update/remove account and object overrides
- hard invariant for time_zone: group must equal name
- verification query to catch bad seed data before it ships
- frontend keying guidance: use group, not id or name
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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