Talk - Queries to delete single message or all messages in a conversation

Nextcloud 20.0.4. Talk 8.2.0

As an admin, I can’t find a way to clear a conversation of all messages. It seems the only way is to run a db query. I’m comfortable using db queries, but don’t know the proper query. Is there some documentation on the proper queries to clear Talk conversation messages.

Are all the Talk text messages stored in a single table? I think it’s oc_comments. Are other tables involved?

If just oc_comments, what is the query to remove all messages between 2 users or just select messages?

Thank you in advance.