Thank you, the second paragraph of your comment is illuminating. There are some more replies in the same vein. I did not understand the mutual independence of

Thank you, the second paragraph of your comment is illuminating. There are some more replies in the same vein. I did not understand the mutual independence of "cards", and how you can use a different data layout if you only need to put it on a single card. > with relational modeling as an academic concept well predating successful implementations of relational databases. This is also non-obvious, thank you!