This is not the smoothest experience for self-hosted deployment btw. When I deploy my Retool and desire the nice retool layout/UX for interacting/viewing my DB, I shouldn't have to create a NEW db and now have to point everything else there, as the source of truth. The UX should be available to be used with any existing "external" DB. (e.g. my db is the same RDS/cluster/VPC/cloudformation and still it's forcing me to create a new DB!)
Also, there's nothing pointing to this documentation from the self-hosted How-To documentation. Very frustrating to suddenly discover this missing functionality!!!