Remap thumb buttons on the Evoluent Vertical Mouse under Linux

I use an Evoluent Vertical Mouse (VM4R). One of its advantage is the number of buttons. Instead of their defaults, I’d like to remap them to keypresses. I want to do this system-wide without an extra service.

This can be done via the hwdb subsystem. This has the advantage of being a fairly generic solution, which allows remapping any key/button to any other.

When working on the #gmobile #hwdb bits for #phosh I noticed there's no syntax highlighting in #emacs for those so I added some:

https://github.com/agx/systemd-hwdb-mode/

Happy about any improvements as my #elisp isn't great.

Want to configure which hardware buttons unblank the screen of your with #phosh? Here's how (and submitting your changes upstream will fix it for others too): https://phosh.mobi/posts/wakeup-keys/