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A full interview on a global e-commerce catalog: requirements and freshness budgets, why the hit ratio must stay above 99%, the multi-tier architecture, flash-sale herd protection and warming, per-type invalidation, activity-tiered personalisation, the cache matrix, surviving a Redis outage, and how to monitor it all.
Previously, on Day 5, you stacked the caches: browser, CDN, gateway, Redis, database.