Blazor webassembly crm demo

Hello. I'm very new in Radzen and Stucked at following the steps in CRM Blazor demo app .

  1. having updating the ApplicationUser in code adding three columns , with dotnet ef command I added migration, why didnt update db after that ? I cannot customize the Add AppUser page with your directives, ı have some problems with the help document
  2. what is the procedure for getting snapshot and adding migration in general?
  3. in Angular counterpart document , ApplicationUser is derived from IdentityUser but in blazor it is not, why?