@rek a long time ago I used an app called Moodstats to track my mood. I think it's abandonware now, but it was really interesting and I've often thought about building a modern version of it. The only piece that I felt was missing was this idea of compounding mood. While you could add notes, there wasn't a system to weigh/tag influences or events. For example if I don't have my coffee, I'm much more likely to be grumpy.