application(2).py

from flask_migrate import flask-migrate
#...

migrate = Migrate(app, db)

@app.shell_context_processor
def make_shell_context():
    return dict(db=db, User=User, Role=Role,
	              Permission=Permission)

@app.cli.command()
def deploy():
    """Running all of our deployment operations."""
    # migrate database to latest revision
    upgrade()

    # create or update user roles
    Role.insert_roles()