phasing in celery

for configuring the vpn server

uncloud_net/models.py

@@ -13,6 +13,16 @@ class WireGuardVPNPool(models.Model):
     Network address pools from which VPNs can be created
     """
 
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=['wg_name', 'vpn_server_hostname' ],
+                                    name='unique_interface_name_per_host')
+            ]
+
+
+    # Linux interface naming is restricing to max 15 characters
+    wg_name = models.CharField(max_length=15)
+
     network = models.GenericIPAddressField(unique=True)
     network_mask = models.IntegerField(validators=[MinValueValidator(0),
                                                    MaxValueValidator(128)])