[Bug]: Deleted user from calendar share does not get deleted in database

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Situation: We have a shared calendar. The calendar is shared to a group of people. The calendar is also shared to a specific user.

If the group is deleted from the calendar share, the entry in the database table 'oc_dav_shares' gets deleted. If the user is deleted from the calendar share, the entry in the database table does not get deleted and stays there (the value from the column 'access' is 5).

Specific description of our situation: The calendar is shared to a group of people, which should not be able to edit the calendar. There is one dedicated person, to add/delete entries from that calendar. This person is also in the group in which the other people are. So if we delete the share from that specific person, he/she cannot see the calendar at all, because the database entry with access level 5 is still there.

Steps to reproduce

1. Create calender and share with group and/or user
2. Delete user from share

Expected behavior

The row in the table should get deleted.

Installation method

Community Manual installation with Archive

Nextcloud Server version

29

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.1

Web server

Apache (supported)

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

The exact NC Version is 29.0.3

Reproduce the calendar-sharing flow by sharing a calendar with a group and a specific user, then removing the user share. Compare the resulting oc_dav_shares rows for group and user removal, focusing on the entry whose access value is 5. Done means removing the user share deletes its database row and the user no longer retains the unintended calendar access.