class Sensor(db.Model):
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    mac = db.Column(db.String(32), nullable=False, unique=True, index=True)
    uuid = db.Column(db.String(36), nullable=False, unique=True, index=True, default=str(uuid.uuid4()))
    tags = db.relationship("SensorTag", secondary=sensor_tag_relations, back_populates="sensors")
    rough_geo_location = db.Column(db.String, nullable=True, index=True)
    name = db.Column(db.String(128), default="<not set>", nullable=False, index=True, unique=False)
    description = db.Column(db.String(4096), nullable=True, unique=False)