The UI for managing workspace scoped groups is broken: The link in `/-/user/$username/groups/` takes you to `/Owners` which then 500s: ``` 2026-01-19 13:48:48,651 [log/2547577/140659885684416] ERROR: Internal Server Error: /debian/-/groups/Owners/ Traceback (most recent call last): File "/usr/lib/python3/dist-packages/asgiref/sync.py", line 518, in thread_handler raise exc_info[1] File "/usr/lib/python3/dist-packages/django/core/handlers/exception.py", line 42, in inner response = await get_response(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/asgiref/sync.py", line 518, in thread_handler raise exc_info[1] File "/usr/lib/python3/dist-packages/django/core/handlers/base.py", line 253, in _get_response_async response = await wrapped_callback( ^^^^^^^^^^^^^^^^^^^^^^^ request, *callback_args, **callback_kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/lib/python3/dist-packages/asgiref/sync.py", line 468, in __call__ ret = await asyncio.shield(exec_coro) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/asgiref/current_thread_executor.py", line 40, in run result = self.fn(*self.args, **self.kwargs) File "/usr/lib/python3/dist-packages/asgiref/sync.py", line 522, in thread_handler return func(*args, **kwargs) File "/usr/lib/python3.13/contextlib.py", line 85, in inner return func(*args, **kwds) File "/usr/lib/python3/dist-packages/django/views/generic/base.py", line 105, in view return self.dispatch(request, *args, **kwargs) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/debusine/web/views/base.py", line 136, in dispatch return super().dispatch(request, *args, **kwargs) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/django/views/generic/base.py", line 144, in dispatch return handler(request, *args, **kwargs) File "/usr/lib/python3/dist-packages/django/views/generic/detail.py", line 108, in get self.object = self.get_object() ~~~~~~~~~~~~~~~^^ File "/usr/lib/python3/dist-packages/debusine/web/views/auth.py", line 399, in get_object group = get_object_or_404( cast(GroupQuerySet[Any], queryset).can_display( ...<3 lines>... name=self.kwargs["group"], ) File "/usr/lib/python3/dist-packages/django/shortcuts.py", line 85, in get_object_or_404 return queryset.get(*args, **kwargs) ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 640, in get raise self.model.MultipleObjectsReturned( ...<5 lines>... ) debusine.db.models.auth.Group.MultipleObjectsReturned: get() returned more than one Group -- it returned 6! ``` TODO: * [x] Duplicate group web UI URLs also inside the workspace namespace (!2628) * [x] Use the UI system to generate URLs to the various group UI pages, picking the right one depending on the presence of a workspace (!2628) * [x] Display the workspace name, if presence, in `debusine-admin group list` output (!2639) * [x] Update the group management commands to deal with an optional workspace name (!2639)