Modified the `GetId<TId>` method in the `EntityExtensions` class to change its return type from nullable `TId?` to non-nullable `TId`, ensuring stricter type safety by throwing an `InvalidOperationException` when the `Id` property is not readable.
Removed a summary comment in the `ICRUDService` interface related to the `CreateAsync` method, which may indicate ongoing documentation updates for clarity on the method's functionality and parameters.
Added `[Obsolete("Use MediatR")]` attributes to various controller and service classes to indicate deprecation in favor of MediatR. Simplified generic type constraints in `CRUDControllerBase` and related files by removing `IUnique<TId>`. Improved structure and documentation in `CSPMiddleware.cs`. Introduced new extension methods in `EntityExtensions.cs` for safer retrieval of 'Id' properties. Removed `IUnique.cs` interface and updated project dependencies in `DigitalData.Core.Application.csproj` for caching. Overall, these changes enhance code maintainability and clarity.
