Url model

app.py

class Url(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    hash = db.Column(db.String(80), unique=True, nullable=False)
    long = db.Column(db.Text(), nullable=False)
    hits = db.Column(db.Numeric(), nullable=False, default=0)

    def __repr__(self):
        return '<Url %r>' % self.id