Implements Phase 2 infrastructure for participant registration and authentication:
Database Models:
- Add Participant model with exchange scoping and soft deletes
- Add MagicToken model for passwordless authentication
- Add participants relationship to Exchange model
- Include proper indexes and foreign key constraints
Migration Infrastructure:
- Generate Alembic migration for new models
- Create entrypoint.sh script for automatic migrations on container startup
- Update Containerfile to use entrypoint script and include uv binary
- Remove db.create_all() in favor of migration-based schema management
This establishes the foundation for implementing stories 4.1-4.3, 5.1-5.3, and 10.1.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
