Click and close the settings-button 3 times within 10 seconds, (on the https://idplace.org site) and the button that will open the relying-party-interface appears.
The database has a large many-to-many-relation between users and apps (user2AppTab (see code)) (Imagining billions of users each with hundreds of apps).
Large many-to-many-relation is not very well handled by Mysql. A column database is probably best.