How can I find out in the database which comments are restricted on a usergroup (not role)?

[Gisela Lassahn]

Hi,

I've got to delete a user group.

When I try it, I get this message: 

There are comments that only this group can see.
Deleting this group would make those comments invisible.

Unfortunately I cannot use the option "Move these comments to be seen by group:" but have to change the comments to be seen by a certain role instead.
And we don't have ScriptRunner.

I've found out that in database table "jiraaction" the column "rolelevel" is filled when a comment is restricted to a role.

But how can I find out which comments are restricted to a usergroup and to which one?

We're on Jira Software Data Center 9.4.8.