diff --git a/evidence/models.py b/evidence/models.py
index 4074b7c..4574f64 100644
--- a/evidence/models.py
+++ b/evidence/models.py
@@ -28,10 +28,7 @@ class Property(models.Model):
     value = models.CharField(max_length=STR_EXTEND_SIZE)
 
     class Meta:
-        constraints = [
-            models.UniqueConstraint(
-                fields=["type", "key", "uuid"], name="unique_type_key_uuid")
-        ]
+        #Only for shared behaviour, it is not a table
         abstract = True
 
 class SystemProperty(Property):
@@ -43,6 +40,12 @@ class SystemProperty(Property):
                 name='property_cannot_be_user'
             ),
         ]
+        #Django orm wont inherit constraints to child
+        #TODO: check if this is needed
+        constraints = [
+            models.UniqueConstraint(
+                fields=["type", "key", "uuid"], name="system_unique_type_key_uuid")
+        ]
 
 class UserProperty(Property):
 
@@ -55,6 +58,10 @@ class UserProperty(Property):
                 name='property_needs_to_be_user'
             ),
         ]
+        constraints = [
+            models.UniqueConstraint(
+                fields=["type", "key", "uuid"], name="user_unique_type_key_uuid")
+        ]
 
 
 
diff --git a/evidence/urls.py b/evidence/urls.py
index 501e867..0d03f61 100644
--- a/evidence/urls.py
+++ b/evidence/urls.py
@@ -20,5 +20,4 @@ urlpatterns = [
     path("<uuid:pk>", views.EvidenceView.as_view(), name="details"),
     path("<uuid:pk>/eraseserver", views.EraseServerView.as_view(), name="erase_server"),
     path("<uuid:pk>/download", views.DownloadEvidenceView.as_view(), name="download"),
-    path('user_property/<int:pk>/del', views.UserPropertyDeleteView.as_view(), name='delete_user_property'),
 ]