> I’ve even talked to users who have workloads that can only be unavailable for 1s – and while I was initially skeptical, when I heard what the workloads were for, I did agree that 1s was a reasonable requirement for them!<p>What could this be? Some crypto exchange is based on PostgreSQL?<p>I generally don't understand this kind of a requirement. Downtime, to me, is inability to have an end to end transaction. During downtime, to me, it is possible to queue writes and cache reads, to some extent.<p>I can understand if there is something in the middle, in the database layer, that needs to happen, but what would it be, that requires sub 1s latency, at that level?