For learning purposes I created quic[0]. I wanted to strip it down to the bare minimum for running something in a "container". I got as far as having it use a preexisting network namespace. The networking part felt like a major piece of work (setting up the network in bash was tedious) so I figured I'd call it a day and leave it as is. Lots of fun and learned a lot about containers/namespaces in the process.

[0] - https://github.com/archevel/quic

Wasn't Python and Postgresql intentionally created for learning purposes? I'm not saying that this project is just as important, just pointing out that "learning purposes" is not a good predictor of a useless project.