Developer builds single-table DynamoDB design for real-time multiplayer game

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A developer built Kauwa Udd, a real-time multiplayer reaction game, for the H0 Hackathon using Vercel and Amazon DynamoDB with a single-table architecture. Instead of separate tables for users, rooms, and scores, all entities share one table using partition and sort key patterns, reducing round-trips and simplifying access control. Room state, player data, rounds, and reactions are grouped under a single partition key, allowing the entire live game state to be fetched in one query. A single Global Secondary Index handles all leaderboard queries — global, daily, weekly, and per-room — by using score as the sort key and querying in descending order. Temporary data like rooms and clicks use DynamoDB's TTL feature for automatic cleanup, while Auth.js session data is also stored in the same table without key conflicts.

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