Revert "Table per concrete class example"

This reverts commit 8c9921febced078e1cc1405a054fd3feb7925dce.

Trying out revert on a simple example :)
Revert "Joined-subclass example"

This reverts commit 3dfeec95ea4d278c986b4cd4f23f02ae01a7cc2b.

Same comment as before :)