first commit

core/apps/management/models/device.py

@@ -0,0 +1,10 @@
+from django.db import models
+from .district import District
+
+class Device(models.Model):
+    address = models.CharField(max_length=100, unique=True)
+    district = models.ForeignKey(District, on_delete=models.PROTECT)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    def __str__(self):
+        return self.address