UML entity-relationship diagram for a competitive gaming platform with user authentication, match scoring, and ELO rating tracking. The schema connects users and players through sessions and classes, with matches recording competitive results and elo_histories tracking rating changes over time. This architecture demonstrates best practices for multi-user gaming systems: normalized tables, foreign key relationships, and audit trails for score validation. Fork and customize this diagram on Diagrams.so to adapt it for your own tournament management or skill-rating system. The design supports concurrent sessions, player validation workflows, and public access tokens for match visibility.