Squashed commit of the following: 6304-del-database

commit b9dd9b47
Author: Herman van Rink <rink@initfour.nl>
Date:   Fri Apr 8 22:14:56 2022 +0200

    Fix the field name

commit c292063e
Author: Herman van Rink <rink@initfour.nl>
Date:   Fri Apr 8 22:03:40 2022 +0200

    Also cleanup databases when a client is deleted, fixes #6304