@CASys if you can backup all settings, then you might probably find it easier to reinstall cloud controller and set same settings. In linux at least, if you uninstall omadac (like sudo apt remove omadac), then you will be asked if you want to backup settings just for the case you did not backup settings for the case that you do want to revert them if you forgot something, just make sure to forget devices and wait until they reset. Editing it in mongodb can probably be done, I've never looked into omada's db, but guess it is possible, just unsure if it will work with the code and if you will be able to provision, one has to try it to know it unless tplink support shares that info.

If you have possibility to create second controller in your local network, set everything there exactly up as in your current controller, then device by device, forget it and add it on new controller as soon as it appears. Then, when every device is moved and configured, you can reinstall on current controller restoring settings from newly created device.

EDIT