@tbr,

It seems to be working fine with PostgreSQL. Please take a look at sample project.

Bitnami provides WAPP Stack to work with PHP and PostgreSQL. I would suggest you to try WAPP over XAMPP for PostgreSQL.

If you are still facing any issue, please share the sample project along with sample database over Google-Drive or Onedrive, so that we can run it locally at our end, understand your use-case properly and help you out.

—
Vishwas R
Team CanvasJS