EdgeDB [1] has indeed a rich GraphQL layer, but it's a very different project.

While it also builds on top of Postgres, EdgeDB replaces the entire relational database front-end. EdgeDB features a SQL replacement language called EdgeQL (analytical capabilities of SQL married with deep-fetching in GraphQL), a higher-level data model (tables -> object types), integrated migrations engine, a custom protocol with great performance & great client APIs, and many other things. Read more here [2].

(disclaimer: I'm EdgeDB co-founder)

[1] https://github.com/edgedb/edgedb

[2] https://www.edgedb.com/blog/edgedb-1-0