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ADR: Add Redis for session cache+186 −4

// packages/api/src/cache.ts
export function createCache(redis: Redis) {
  return {
    async get(key: string) {
      return redis.get(`mg:${key}`);
    },
    async set(key: string, val: string) {
      await redis.setex(`mg:${key}`, 3600, val);
    },
  };
}

MergeGraph

Related decision found

PR #28 discussed Redis vs in-memory for auth sessions. Team chose Redis for horizontal scaling — this ADR aligns with that tradeoff.

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