The Profile tab said an assistant used it to personalise chat and a daily
journal. Neither exists, and nothing read the profile: the page saved to
user_profiles and the backup carried it. Removed the tab, the client calls,
/api/profile, the service and the model, and migration 0123 drops the table
(downgrade recreates it empty).
Backup format v27 stops writing user_profiles; an older archive carrying the
section still restores, and the file-restore integration test now proves it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
