Setup Redis caching layer for recommendation results

Overview

Implement Redis caching to improve recommendation API performance.

Requirements

• Redis Cluster setup (3 nodes minimum)
• Cache key strategy: rec:{user_id}:{context}
• TTL: 15 minutes for personalized recs
• Cache invalidation on user actions

Configuration

REDIS_CONFIG = {
    "host": "redis-cluster.internal",
    "port": 6379,
    "db": 0,
    "max_connections": 50
}

Acceptance Criteria

• Cache hit rate > 80%
• Failover handling (fallback to DB)
• Monitoring metrics exposed