Subscribe to kind 31922/31923 events and upsert into local DB:
- New events discovered from relays are auto-approved
- Existing events are updated if incoming version is newer
- Deduplication via event ID and d-tag correlation
- Events from Nostr have empty wallet (not ticketed locally)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
