I have created a project with Radzen and Postgresql. Edit and delete rows of the tables don't work because
var items = context.Almacens
.AsNoTracking()
.Where(i => i.refe == refe);
You can start the project with Visual Studio and put a breakpoint in that method to check if the refe parameter has the right value and if there is a corresponding record in the database.
This is very strange. Does editing work? I mean opening the edit page and getting an item loaded in the form? It uses GetXXXById which uses similar Entity Framework code.