API for assigning guestbook to dataset should create a draft version

[ekraffmiller]

What steps does it take to reproduce the issue?

The PUT /api/datasets/{identifier}/guestbook API currently updates the dataset-level guestbook_id directly without creating a dataset draft version.

• Which page(s) does it occurs on?

• What happens?

• To whom does it occur (all users, curators, superusers)?

• What did you expect to happen?
  a new draft version should be created with the assigned guestbook, rather than assigning it to the published version.

Which version of Dataverse are you using?
6.11

Any related open or closed issues to this bug report?
Related to this frontend issue: IQSS/dataverse-frontend#977

[qqmyers]

Is the guestbook used with files from earlier versions once it's added? If so, it seems odd that a new version is needed to add it. FWIW - the guestbook is associated with the dataset object in the db so there would be no change to the new datasetversion itself.

[pdurbin]

Yesterday at standup @qqmyers convinced us we should talk more about what the fix should be so I moved this issue to "needs design" and added it to the agenda for tech hours.

[cmbz]

2026-08-12: Related issue needs to be addressed first: #12601