Use in Chromium-based browsers (Chrome, Edge, etc.):

1. Open the console (F12)
2. Copy the code from the file downgradeUsers.js and paste it into the console
3. Enter auth token into AUTH_TOKEN. The token can be obtained from a Tracker browser request. Log into Tracker, open the console (F12), go to the Network tab, refresh the page, find the latest request with the name graphql, go to the Headers tab, copy the value of the Authorization header.
4. Enter the URI for the Tracker instance into TRACKER_URI
5. Press Enter
6. Wait for the script to finish
7. Enjoy

CSV file format given in the example file example.csv.