SqlMapperExtensions with Smartrak enhancements
[ManualKey]
Used the same as [Key], but the initial value (for Insert) must be set in your code.
[TablePerType] Set on the base (abstract) class in an inheritence tree to use table per type style storage. You'll need to have a type field on the base class which you'll need to use yourself to decide what type each row is. Each type needs a [Table] attribute