code quality

api_app/models.py

@@ -1794,12 +1794,6 @@ class SingletonModel(models.Model):
     Singleton is a desing pattern that allow only one istance of a class.
     """
 
-    def save(self, *args, **kwargs):
-        # check required to delete the singleton instance and create a new one
-        if type(self).objects.count() == 0:
-            self.pk = 1
-        super().save(*args, **kwargs)
-
     class Meta:
         abstract = True
         constraints = [
@@ -1810,6 +1804,12 @@ class Meta:
             ),
         ]
 
+    def save(self, *args, **kwargs):
+        # check required to delete the singleton instance and create a new one
+        if type(self).objects.count() == 0:
+            self.pk = 1
+        super().save(*args, **kwargs)
+
 
 class LastElasticReportUpdate(SingletonModel):
     last_update_datetime = models.DateTimeField()