title: SQLAlchemy set default value for postgres JSON column
body: <p>I want to set the default value of my SQLAlchemy postgres JSON column to an empty dictionary. </p>
  
  <pre><code>from sqlalchemy.dialects.postgresql import JSON
  
  info = Column(JSON, default='{}')
  info = Column(JSON, default={})
  </code></pre>
  
  <p>Neither of these work.</p>