Flask-Migrate is an extension that handles SQLAlchemy database migrations for Flask applications using Alembic. Database operations are made available through the Flask command-line interface or through the Flask-Script extension.
Full list of migration commands and
flask-migrate documents can be found here.
Initialise migration repository
$ flask db init
$ flask db migrate -m "enter migration message here"
This command creates a python script that describe what changes will be applied to our database.
$ flask db upgrade
Rollback migration (downgrade)
$ flask db downgrade
All migration commands preserve data in the database.
List migration history
$ flask db history