[jeffreyrogers]

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

[zerr]

The non-advanced one - intro, seems like a good fit - and you also get to implement a custom storage for SQLite.