- Make the UI responsive
- Make buttons and links tabbable
- Add a "running campaigns" widget on the dashboard
- Add more analytics and stats
- Add bounce tracking
- Pause campaigns on % errors in addition to an absolute numbers
- Support DB migrations for easy upgrades
- Add materialized views for analytics and stats (and more?)
- Add GDPR-esque features (complete data download for end users, "forget me" option)
- Add user management and permissions
- Add tests