Wellington

**had to open the pr again because it seems like i messed up my previous fork? 😅😅 Just discovered and tried out the system today, and then I stumbled upon...

Anyone cares to shed a light on how to enable foreign_keys with this library? I've tried doing the following: ```c++ OATPP_CREATE_COMPONENT(std::shared_ptr, dbConnectionProvider)([] { auto connectionProvider = std::make_shared("database.sqlite"); auto result =...