The software offers a full featured API (Application Programming Interface) allowing to automatize different tasks from 3rd party tools or access the data for example from "Power BI".
The documentation of the api can be found on the /swagger page.
To access data from "Power BI" add a "Web" data source (from the toolbar "Get Data" for example), type in the URL with the /api corresponding to the data you want to read, and choose the Basic authentication providing your email as username and your password.
Many tables have relations which are described in the DB Design page.