feat(itim): save_history method added to Service

ref: #605 #628

app/itim/models/services.py

@@ -419,6 +419,19 @@ class Service(TenancyObject):
         super().save(force_insert=force_insert, force_update=force_update, using=using, update_fields=update_fields)
 
 
+    def save_history(self, before: dict, after: dict) -> bool:
+
+        from itim.models.service_history import ServiceHistory
+
+        history = super().save_history(
+            before = before,
+            after = after,
+            history_model = ServiceHistory,
+        )
+
+
+        return history
+
     def __str__(self):
 
         return self.name