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The sketch of the user flow for the first prototype can be seen here https://app.moqups.com/santiago.ingold@gmail.com/KCTLq4WnAL/...

Again, comments are welcomed :)

I took a look at the mock up, and I think you're aiming for the same space as Karma Platform; converting spreadsheet-as-db to web app.

Yes, that is basically the idea for the first version, I will take a closer look to Karma Platform