https://chanmingman.wordpress.com/2020/11/08/entity-framework-core-using-sql-server/
The entity type requires a primary key to be defined. If you intended to use a keyless entity type call ‘HasNoKey()’ https://chanmingman.wordpress.com/2021/07/31/the-entity-type-requires-a-primary-key-to-be-defined-if-you-intended-to-use-a-keyless-entity-type-call-hasnokey/
Entity Framework Lazy Loading https://chanmingman.wordpress.com/2021/10/17/net-entity-framework-lazy-loading/