Anyone know where in the WordPress database.

Looked around, seems it’s wp_comment_notifier table, still wondering if data ends up anywhere else in the DB. Thanks, MTN

I think that most of data is in wp_users

The table is wp_comment_notifier and specific options is on wp_options table. Nothing in wp_users.

Ok, thank you!
I has just checked it and solved the issue, which I posted in another ticked!