My small team uses and loves Mattermost. It's a great FOSS project.
And, direct access to the PG database has been awesome for integrations. (Watch out tho, seems to be missing a bunch of FKs (that I think should be there))
And, direct access to the PG database has been awesome for integrations. (Watch out tho, seems to be missing a bunch of FKs (that I think should be there))
And basically every table with a user_id column.
My install created none.
My contact is in my profile if you want more info