diff --git a/src/models.py b/src/models.py
index 260a056..0c92a8f 100644
--- a/src/models.py
+++ b/src/models.py
@@ -29,11 +29,11 @@ class SensorStatusEnum(enum.Enum):
 class Device(db.Model):
     __tablename__ = 'device'
     id = db.Column(db.Integer, primary_key=True)
-    sensorid = db.Column(UUID(as_uuid=True), nullable=False)
+    sensorid = db.Column(UUID(as_uuid=True), nullable=True)
     status = db.Column(db.Enum(DeviceStatusEnum), nullable=False)
     url = db.Column(db.String, nullable=False)
     lastupdate = db.Column(db.TIMESTAMP, nullable=False, server_default=func.now(), onupdate=func.current_timestamp())
-    sensors = db.relationship("Sensor", nullable=True)
+    sensors = db.relationship("Sensor")
 
 
 class Sensor(db.Model):