[grenoire]

I think there was a bit of a confusion on the implied use case of our project. As another commenter pointed out, when the data is user supplied and is not always uniform in nature, creating migrations for each adjustment to the custom fields they can modify becomes virtually impossible. I ended up settling for JSON fields because I don't have to migrate the data or the database schema; I can just do a best-guess conversion for the data when it hits the UI, and supply some validation warnings if it really doesn't make sense (e.g. a non-date string somehow makes it into a "date" field).