Fix overwriting 'read' state of IncomingMessage every time it is "received"

shiftregister/team/tasks.py

@@ -16,12 +16,14 @@ def receive_messages():
         from_dt = None
 
     try:
-        for sms in list_incoming_sms(from_dt):
-            IncomingMessage(
+        for sms in reversed(list_incoming_sms(from_dt)):
+            IncomingMessage.objects.get_or_create(
                 id=sms.id,
-                sender=sms.sender,
-                content=sms.content,
-                created_at=sms.created_at,
-            ).save()
+                defaults={
+                    "content": sms.content,
+                    "created_at": sms.created_at,
+                    "sender": sms.sender,
+                },
+            )
     except Exception as e:
         sentry_sdk.capture_exception(e)