### What happened? Hello @Brilator @Freymaurer When I tried to add a new column and re open the ARC I am seeing this error. <img width="632" height="324" alt="Image" src="https://github.com/user-attachments/assets/7c9d7438-e043-42fd-b0ca-e9f55124f1d6" /> ### What did you expect? _No response_ ### Operating system (OS) Windows ### ARCitect version v1.6.0