- Add generated columns and indexes for correctness and metadata fields
- Optimize get_all() with keyset pagination
- Add get_pending_for_review() for targeted queries
- Update cron tasks to use optimized queries instead of full table scans
- This fixes timeouts in review_brain and verify_pending_external (300s timeout)
Fixes#35: Second-Brain in Takt bringen, Dedup, Pendings, Graph und Performance