Database changes:
- Add ActivityLog model for comprehensive activity tracking
- Track all user actions (auth, events, matches, admin)
- Denormalized username for query performance
- JSON metadata for flexibility
- Multiple indexes for common filter patterns
- Add isAdmin flag to User model for admin access control
- Add activityLogs relation to User
Schema pushed to database with prisma db push
Created initial admin user: spotlight@radziel.com
This is Phase 1 of Activity Log System implementation.
Next phases: backend service, middleware, API endpoints, frontend UI.
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