Everyone Assumes Manual Scaling Works Until It Doesn’t: What 99.999999999% Durability Actually Tells You

https://alexisqoem867.trexgame.net/when-constant-polling-meets-finite-storage-how-partitioning-by-workload-type-solved-our-scaling-nightmare

When an Engineering Team Learned the Hard Way That Durability Isn't a Free Pass Maria, the infrastructure lead at a mid-stage SaaS company, woke up to 2 a.m. alerts. The customer-facing API was returning 500 errors for a subset of customers