Updating of referencing data

Current behavior
Currently, it is not possible to update reference data such as membership numbers via CSV import. In most cases, this protection is correct. However, it is a hindrance when deliberately updating this data, as the data can ONLY be adjusted manually on an individual basis. This is not practical.

Wanted behavior
A way to update the above-mentioned reference data is needed.

Idea: A new update function will be integrated for superadmins and orga admins. To prevent this option from being used unknowingly, the function will be separated from the previous import and integrated into a different menu. Furthermore, when using this function, an additional security prompt will ask whether you want to update this data.

Feel free to add more ideas :)

Start by tracing the existing CSV import flow and the menus available to superadmins and organisation admins. Define how a separate reference-data update function, an explicit security prompt, and the membership-number update behavior should fit together before implementation; done means authorized administrators can deliberately update reference data without changing the existing import protection.