In .Net 7 and above, EF Core supports JSON document columns and most of relational databases like SQL Server, PostgreSQL and MySQL support this feature. With this feature, we can access this JSON column data without serialization or deserialization
Vertical Slice Architecture vs Clean Architecture
In Vertical Slice Architecture instead of splitting in technical aspect, we split our system to some business functionalities and inner each business we have some features/slices. for example in the catalog bounded context, we have product aggregate and for this aggregate we can create some feature/slice. Each feature/slice is completely independent and isolated from other feature/slice.
Problem Detail provide machine-readable details of errors in a HTTP response to avoid the need to define new error response formats for HTTP APIs based on https://tools.ietf.org/html/rfc7807.