I know for the advanced database course the students end up writing a new feature for an existing database called Peloton, which is a research project at CMU[0]

I know for the advanced database course the students end up writing a new feature for an existing database called Peloton, which is a research project at CMU[0]. You obviously aren't writing the whole thing from scratch though. [0]: https://github.com/cmu-db/peloton https://github.com/cmu-db/peloton