%% After: Client and Order become plain domain objects (no DbBase inheritance).
%% Dedicated *Dto classes carry data to/from the WebApp, and a mapper converts
%% each way, including the relations. EF dependency isolated to persistence layer.
classDiagram
    class DbContext {
        +SaveChangesAsync()
    }
    class DbBase {
        +Guid id
    }
    class WebApp {
        <<Web App>>
    }
    class Client {
        +Guid id
        +string name
    }
    class Order {
        +Guid id
    }
    class ClientDto {
        +Guid id
        +string name
    }
    class OrderDto {
        +Guid id
        +ClientDto client
    }
    class Mappers {
        +ClientDto ToClientDto(Client c)
        +Client FromClientDto(ClientDto dto)
        +OrderDto ToOrderDto(Order o)
        +Order FromOrderDto(OrderDto dto)
    }

    DbContext ..> DbBase : still used by persistence layer
    WebApp --> ClientDto
    WebApp --> OrderDto
    WebApp --> Mappers
    Mappers <--> Client : maps each way
    Mappers <--> ClientDto : maps each way
    Mappers <--> Order : maps each way
    Mappers <--> OrderDto : maps each way
    Client "1" --> "*" Order : has many (domain relation)
    ClientDto "1" --> "*" OrderDto : has many (DTO relation)