I don't know how lightweight you're looking for, but you might also want to have a look at Zammad: https://github.com/zammad/zammad https://github.com/zammad/za

I don't know how lightweight you're looking for, but you might also want to have a look at Zammad: https://github.com/zammad/zammad https://github.com/zammad/zammad I worked with a self-hosted deployment of it before, and it was reasonably low-maintenance.