per server webmail seems to be using sqlite, not sure if that's by default, or just because the db role wasn't added to the email server.
it also seems to be using a single db.sqlite file for all users.
just want to check if there's any issues with changing this to use mysql (mariadb)
don't expect any, but want to make sure in case enhance is doing something here that specifically expects sqlite.
also, since this file/db would contain all the contact addresses for users (and calendars if eg kolab calendar is installed) shouldn't there be some option to have it included in with the normal incremental backups.
