metabrainz/acousticbrainz-server — pull request #8 by ianmcorvidae (2014-10-16 00:58:48+00:00)
Title: Store statistics history in the database, and show a graph of their values over time.

Like it says. Uses D3.js because it's shiny and I felt like learning a tiny bit about how to use it (plus a helper called NVD3).