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It's a php app. All you have to do to run it locally is use the php server:

php -S localhost:8001

Open in your browser:

localhost:8001/index.php

You can also directly access the sqlite database if you want.

Also running this on a raspberry pi I have stuffed somewhere in a closet, it's genuinely great. Web interface even works decently on mobile (mostly use it for viewing and dragging not creating issues).

That looks cool! Does it have APIs?

Edit: yes it has!

I'll be trying this tonight.