title: How do I specify type of index in django? (btree vs hash, etc)
body: <p>Like the title says, how do I specify the type of index I want on a field in a model in django.</p>
  
  <pre><code>class Person:
       ...
       age = models.IntegerField(db_index=True)
  </code></pre>
  
  <p>But now what? How do I make sure it is a <code>btree</code> index and not a <code>hash</code>. Or is this all done automatically for us and there is some large table that django uses for choosing the "optimal index type"</p>