Help Configuring Postgres Tables compatible with Stacker

Trying to build an app directly on Postgres tables but running into issues where Stacker is only reading the records and not permitting Update/Delete, despite NOT selecting the ‘read only’ option in the connection configuration. We’ve run through the standard troubleshooting/considerations available in the documentation. Has anyone successfully done this? Any sample CREATE TABLE statements that worked for you? Specifics on data type limitations/etc.? Any tips would be appreciated - thanks!