Online gaming platform ERD modeling player profiles, game catalogs, sessions, achievements, and social features through normalized relational schema. The PLAYER table anchors core user data while SESSION, ACHIEVEMENT, and LEADERBOARD tables track gameplay metrics and progression. INVENTORY and TRANSACTION tables manage in-game items and monetization, with FRIEND and PLAYER_ACHIEVEMENT junction tables enabling social connectivity and achievement tracking. This schema demonstrates best practices for gaming backends: foreign key relationships enforce referential integrity, enum fields standardize status and item types, and denormalized rank/score columns optimize leaderboard queries. Fork this diagram to customize for your game's progression system, add payment provider integrations, or extend with clan/guild hierarchies.