User migration creates a second birthday calendar that can't be removed

[thomasjager]

Steps to reproduce

1. Use User Migration app to export calendars from a Nextcloud instance
2. Important the file in a new user on a fresh Nextcloud instance
3. Observe that there are now two Birthday calendars; one disappears when turning off the birthday calendar, but the other (migrated-contact_birthdays) stays, and does not sync with new contacts
4. Press Delete on the calendar, it gets struck through, but on a page refresh it is back

Expected behavior

The Birthdays calendar probably shouldn't be migrated at all. It seems like the newly generated Birthdays calendar works perfectly with my migrated contacts.

Actual behavior

I now have two birthday calendars (I'm guessing I can remove the other with an OCC command or similar, but I still feel this can be improved by not migrating it at all, or allowing it to be removed

Calendar app version

6.5.3

CalDAV-clients used

Thunderbird, DAVx5

Browser

Firefox 153

Client operating system

Ubuntu

Server operating system

Debian 13

Web server

Apache

Database engine version

No response

PHP engine version

No response

Nextcloud version

Nextcloud Hub 26

Updated from an older installed version or fresh install

No response

List of activated apps

Nextcloud configuration

Web server error log

Log file

Browser log

Additional info

No response

[thomasjager]

For anyone else finding this issue in the meantime, if you have access to OCC (or the OCCWeb application, if you have a managed Nextcloud instance), you can remove the calendar in OCC.

First, to verify the name of the calendar:

occ dav:list-calendars [username]

Gives you a list of the calendars. You should see your normal calendar(s) there, but not your regular birhtday calendar. The migrated birthday calendar is not really a birthday calendar, however, so it shows up, probably as migrated-contact_birthdays.

Then, to remove it, with the -f being needed to actually remove it (it fails otherwise):

occ dav:delete-calendar [username] migrated-contact_birthdays -f

Run occ dav:list-calendars [username] again to verify it has been deleted.