New server models

WinWARP.Core/Data/AppDbContext.cs

@@ -10,6 +10,7 @@ public class AppDbContext : DbContext
 {
     public DbSet<Subscription> Subscriptions => Set<Subscription>();
 
+
     public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
     {
 
@@ -21,5 +22,12 @@ public class AppDbContext : DbContext
 
         modelBuilder.Entity<Subscription>()
             .HasKey(s => s.Id);
+
+        modelBuilder.Entity<Subscription>()
+            .HasMany(s => s.Servers)
+            .WithOne(s => s.Subscription)
+            .OnDelete(DeleteBehavior.SetNull);
+
+        modelBuilder.Entity<StandaloneServer>();
     }
 }