Xata, a new serverless Postgres platform

Just to set a bit more context, there are two types of clusters in Xata, shared and dedicated. For shared, we indeed bundle the CPU/memory cost into storage. This is because, typically, a small database also won't consume too much CPU/memory, so there is some correlation there.

For dedicated, pricing works the same as in Amazon Aurora.

> At some point your db is munching through costly ram and processor and oft times doing nothing. Serverless is meant to indicate a solution to this concern. it's just hard to see at a glance where the efficiency gains of this approach really are (seemless migrations and branching are cool and all) so it looks like it's too good to be true.

The efficiency gains, for small databases, are in using shared clusters. This breaks at larger scale due to the noisy neighbor problem, however, moving databases seamlessly from one cluster type to another makes it easy to choose the "right size for you".

> The Xata Postgres service is using AWS Aurora under the hood

Not sure I'd consider that open source, even if some of the tooling around it has been open sourced.

Yes. You install and run postgres.