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Cache-aside, write-through, write-behind patterns, eviction policies, cache stampede protection, and CDN edge caching
Client, CDN, web server, database, and application caching
Query level vs object level caching
Cache update strategies — when to use each and their trade-offs
Request coalescing, probabilistic early recomputation, and local shadow caches
Cache-Control headers, surrogate keys, purge vs invalidation at the edge