Your database is being updated in the background

This message, it never goes away:

“User Registration Data Update – Your database is being updated in the background. Taking a while? Click here to run it now.”

How can I 1) verify that whatever update is supposed to have happened has happened 2) remove whatever data in wp_options that is flagging the db as needing and update if it has already been updated

(yes, I’ve “clicked here to run it now”)