[edbrown23]

Generally systemd manages enabled/disabled services through symlinks in /etc/ (/etc/systemd/system/ on my Fedora 24, for instance), which you can add/delete in the shell if you want to. It's admittedly not plain-text, but manipulation-wise it's about equal.

[mjevans]

It's using the default database (the filesystem) for it's configuration in that instance.

[robmccoll]

Nice - learned something new. Thanks!