Allow user to choose whether data is overwritten when importing over an existing user

[Pytal]

Currently all data is overwritten, a user should be able to choose per data interactively whether to overwrite and also be given a flag for non-interactive mode e.g. --overwrite=true

[PVince81]

we have a prompt already, but the CLI option is missing

[kubuntu-newbie]

I don't see the prompt in the web UI (Nextcloud 29.0.4, User Migration 6.0.0)

Currently, data appears to be merged, old files remain and new files are added, no option to remove old files that don't exist in the export file and keep only files from the user.nextcloud_export.
Calendars with the same names are created instead of overwriting old calendars that have the same name.
My use case is use User Migration as a backup or to synchronize 2 Nextcloud servers so when I restore the export file, I'd like to see old files/calendars etc removed and replaced with the files/calendars from the export file.

Would be great if there was an option in Web UI to choose to merge or overwrite.

[Pytal]

we have a prompt already, but the CLI option is missing

I do not recall what prompt this was referring to 🙈

@kubuntu-newbie this functionality is currently not present via web or cli, whether data is overwritten is determined by the migrator implementation

We will consider this feature going forward