Add authenticated device registration for USB intake

inventory/models.py

@@ -102,6 +102,14 @@ class FieldDefinition(TimeStampedModel):
         return self.name
 
 
+class DeviceRegistration(TimeStampedModel):
+    """Durable receipt so retrying a USB report cannot allocate another device."""
+
+    request_id = models.UUIDField(unique=True)
+    payload_hash = models.CharField(max_length=64)
+    device = models.OneToOneField("Device", on_delete=models.PROTECT, related_name="registration")
+
+
 class FieldOption(TimeStampedModel):
     field = models.ForeignKey(FieldDefinition, on_delete=models.CASCADE, related_name="options")
     label = models.CharField(max_length=120)