Stale duplicate alert on glossary

[nijel]

Describe the issue

There is duplicate string alert on glossary component without a matching unit after such string is removed in Weblate.

I already tried

• I've read and searched the documentation.
• I've searched for similar filed issues in this repository.

Steps to reproduce the behavior

1. Create duplicate entry in a glossary component, in past, this might have been caused by Some glossary terms are saved twice to TBX causing translations to disappear #9701, but has to be done manually on the repository now.
2. Make Weblate load these strings.
3. Observe there is DuplicateString alert triggered.
4. Remove the problematic string in Weblate.
5. The alert is still there, it just no longer links to a string.

Expected behavior

The alert should disappear when problematic string is removed.

Screenshots

Exception traceback

No response

How do you run Weblate?

weblate.org service

Weblate versions

No response

Weblate deploy checks

No response

Additional context

The DuplicateString alert is triggered only upon parsing the files, so it is never cleared on normal operations on a glossary component without a remote repository (adding/removing strings does not trigger that).

Therefore, all import only errors should be revisited if they can't disappear in other situations. In case there is the only one affected, we might hook into unit removal and remove the unit from alert when it is being removed. The alert itself can be removed once there are no units left. Some more complex solution might be needed when there are more such alerts.