Maybe you tried to include too many features? :) My friends just wanted to give cryptocurrencies a try, and all these charts and orders are too complicated! This is where they can create a portfolio in couple of clicks and check it weeks later if they feel like it!

No, my idea is slightly more involved. However I want to use my own data, not other people's, so I spent time setting up a proper DB schema to hold exchange data from various providers. This is not complicated but also not trivial.

well, if you find yourself not wanting to work on it because someone else did it already, would you consider putting your schema online?

No I'm still working on it. I will definitely consider pushing code to GitHub.