# Migrations

### Flask-Migrate, migrations with Alembic
$ pip install Flask-Migrate

And on our `main.py` import and add Migrate
```python
from flask_migrate import Migrate
from config import DevConfig

app = Flask(__name__)
app.config.from_object(DevConfig)

db = SQLAlchemy(app)
migrate = Migrate(app, db)
```

> (Optinally) Tell Flask where is the app
$ export FLASK_APP=main.py
$ flask db

tracking changes (create `migrations` folder)
$ flask db init

begin stored changes in `migrations/versions/`
$ flask db migrate -m"initial migration"

$ flask db upgrade --sql
$ flask db upgrade

$ flask db history
$ flask db downgrade number_hash