Rancher support for PostgreSQL

Can we setup Rancher in HA mode behind PostgreSQL DB ? In the docs , it mentions about MySQL only. If it supports PostgreSQL do we have documents on how to configure Rancher in HA mode

http://rancher.com/docs/rancher/v1.6/en/installing-rancher/installing-server/#requirements

The only “supported” database is MySQL (and compatible variants). There was experimental support for Posgtres contributed by a user and merged in a while ago, but it does not work with the current catalog service which makes it basically unusable in current versions.