gahusb b3982c8f72 feat(insta-lab): db migration — trending_keywords.source + account_preferences + CRUD ...

- Idempotent ALTER TABLE adds source column (default 'manual') + idx_tk_source index
- New account_preferences table seeded with economy/psychology/celebrity at weight=1.0
- add_trending_keyword now accepts optional source param
- New helpers: add_external_trend, list_trends, get_preferences, upsert_preferences
- test_db updated: six→seven tables; test_preferences_crud.py (7 new tests, all pass)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-16 17:44:01 +09:00

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