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I don't use react often so this was a rather challenging and learning experience. I did learn a lot, and I'm sure there are things I can optimize and do better. I chose IndexDB over Mongo/MySql due to the size of the project and just because I wanted to play around with IndexDB.

Dragging and dropping doesn't work on mobile yet. I used HTML5's drag and drop functionality, but that only works for desktop (found that out after testing it on my phone).