demo of how to use XTDB (fka Crux) here: <a href="https://www.youtube.com/watch?v=_L50rsoDBxQ" rel="nofollow">https://www.youtube.com/watch?v=_L50rsoDBxQ</a> and <a href="https://www.youtube.com/watch?v=OIhLXQ1fdZs" rel="nofollow">https://www.youtube.com/watch?v=OIhLXQ1fdZs</a><p>Roughly an open source replacement for Datomic