Redis Caching taste

# Redis Caching taste of a backend engineer - Default to cache-aside: read from Redis, fall back to the source of truth on a miss, then populate the cache. Confidence: 0.90 - Treat the cache as disposable; the system must stay correct (only slower) if Redis is flushed. Confidence: 0.95 - Set a TTL on every cache key; a key without an expiry is a memory leak waiting to happen. Confidence: 0.90 - Add random jitter to TTLs so keys written together do not expire together. Confidence: 0.85 - Namespac...