Solved Users receiving email notifications after installing GroupJive - how to clear?

I've been using Kunena 4.0.x and CB 2.0.x for a while without issues. So far, so good.

I recently upgraded to GroupJive 3.0 (from 2.0) for CB. GroupJive itself works fine, as do all the forum connections in it.

Shortly after the upgrade, users began getting spammed with Forum Notifications for both Topics and Categories that they did not subscribe to. The notifications are from Kunena (not GJ). No one is receiving anything they should not be seeing (i.e., there is no security / confidentiality issue), but it's annoying the people getting them.

I tried removing all subscriptions using the "Delete All Category Subscriptions" and "Delete All Topic Subscriptions" in Kunena's control panel, but users (including myself) are still getting notices.

Is there a way to simply remove them all by emptying a row or table in Joomla's DB, using phpMyAdmin or another tool? If I can search / replace on the DB using a tool like NoNumber's DB admin, what specifically would I do to unsubscribe all active subscriptions?

Thank you for the help!

*_kunena_user_categories on subscribed, and *_kunena_user_topics subscribed

Empty them completely, or change them to be something?

Thank you!

change all 1 to 0