title: OnModelCreating - forcing new creation
body: <p>In some situations, during the application run, I need to turn on identity insert:</p>
  
  <pre><code>modelBuilder.Entity&lt;Activity&gt;().Property(p =&gt; p.Id).HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.None);
  </code></pre>
  
  <p>But, since OnModelCreating is executed only once, what would be the best way to achieve this? Is it possible to recreate model?</p>