Removed contented updates the notifications stats table

- As before this is now driven from the notifications history table

- Removed from updates and create
- Signatures changes to removed unused params hits many files
- Also potential issue around rate limiting - we used to get the number sent per day from the stats table - which was a single row lookup, now we have to count this. This applies to EVERY API CALL. Probably not a good thing and should be addressed urgently.

tests/app/conftest.py

@@ -366,7 +366,7 @@ def sample_notification(notify_db,
         data['job_row_number'] = job_row_number
     notification = Notification(**data)
     if create:
-        dao_create_notification(notification, template.template_type)
+        dao_create_notification(notification)
     return notification