title: EF Core Annotation for OnDelete
body: <p>I hava an annotation problem:</p>
  <pre><code>        modelBuilder.Entity&lt;FirstClass&gt;()
              .HasOne(f =&gt; f.SecondClass)
              .WithOne(s =&gt; s.FirstClass)
              .HasForeignKey&lt;FirstClass&gt;(f =&gt; f.SecondClassId)
              .OnDelete(DeleteBehavior.Cascade);
  </code></pre>
  <p>How to write this with annotations? I don't find the annotation for OnDelete.</p>