caching-strategies

Choose cache-aside, write-through, or write-behind patterns for web systems; set TTLs; design invalidation; and configure Redis, CDN, and browser caching. Use for cache invalidation strategy, Redis caching, Cache-Control or ETag policy, and stampede prevention. Activate on "cache invalidation", "cache-aside", "write-through", "Redis cache", and "cache stampede". NOT for database query tuning, language-level memoization, or hardware cache behavior.