user = relationship('User', backref='user_reviews', foreign_keys=user_id)
business_user = relationship('User', backref='business_user_reviews',
    foreign_keys=[business_user_id])


class User(db.Model):
    __tablename__ = 'User'
id = db.Column(db.Integer, primary_key=True)
Flask Foreign_keys по-прежнему показывает AmbiguousForeignKeysError