This commit removes the `IUserReceiverRepository` service registration from `DIExtensions`, indicating it is no longer needed. The `UserReceiver` and `Config` DbSet properties have been eliminated from the `EGDbContext`, along with their initialization in the constructor. Additionally, the `UserReceiver` entity has been removed from the model builder configuration and the associated trigger has been deleted. These changes reflect a refactoring of the data model to simplify the architecture and improve maintainability.