title: How to change model and update database, make migrations, in flask-admin?
body: <p>I already have my flask-admin app with its models and database and tables created..</p>
  
  <p>Now I would like to add a field to model and that should be reflected in the database by a new column in the model's corresponding table.</p>
  
  <p>With django one would create then apply migrations..</p>
  
  <p>How do I make migrations/schema-changes in flask-admin?</p>