If you are willing to give it a shot, there is currently a fork of postgrex from someone in the Elixir community! It handles some of rough edges of the incompatibility. You can find it at https://hexdocs.pm/postgrex_cdb/readme.html and the source code at https://github.com/jumpn/postgrex.

For any other issues you run into when using it, you may want to see the discussion about postgrex compatibility at https://github.com/cockroachdb/cockroach/issues/5582. If you run into different problems please do file the issue :).

I'm also an Elixir junkie, so I would also love to see ORM compatibility here! I definitely want to dedicated time to it if I can. (Disclaimer: I'm currently interning at Cockroach Labs.)