Flask-Migrate
https://github.com/miguelgrinberg/Flask-MigrateFlask-Migrate is exactly what I've been looking for when it comes to database migrations. When I create PHP applications with MVC frameworks, the changes in the database need to be done manually when the model is changed. Flask-Migrate handles changes to the database (like adding/removing columns) so your models reflect your database.
This is a big advantage Flask has over PHP frameworks.