Hi, can't see any config option to retain colors (from wipe to wipe). Is this possible? Or do I need to repeat the setup each wipe / restart … ?

All plugin data is stored in the oxide/data/ColouredChat.json file. This stays over wipes and does not get reset. There is something called "Player Inactivity Removal (Days)" which automatically removes all player data (so only the data when players set their color manually, not inherit the color over groups etc). That you can change in the oxide/config/ColouredChat.json file if you want it to be higher or less than the default, 7 days.

Thank you!