This assumes you want to use records for your data: records don't have inheritance. So whereas in C# you could create a UserDb that extends User with the Id/Da

This assumes you want to use records for your data: records don't have inheritance. So whereas in C# you could create a UserDb that extends User with the Id/DateAdded fields, in F# that's not idiomatic. I am sure there could be a good way to automate this using type providers, but I haven't tried it yet.