Rebecca Law 35b20ba363 Correct the daily limits cache. ...

Last year we had an issue with the daily limit cache and the query that was populating it. As a result we have not been checking the daily limit properly. This PR should correct all that.

The daily limit cache is not being incremented in app.notifications.process_notifications.persist_notification, this method is and should always be the only method used to create a notification.
We increment the daily limit cache is redis is enabled (and it is always enabled for production) and the key type for the notification is team or normal.

We check if the daily limit is exceed in many places:
 - app.celery.tasks.process_job
 -  app.v2.notifications.post_notifications.post_notification
 - app.v2.notifications.post_notifications.post_precompiled_letter_notification
 - app.service.send_notification.send_one_off_notification
 - app.service.send_notification.send_pdf_letter_notification

If the daily limits cache is not found, set the cache to 0 with an expiry of 24 hours. The daily limit cache key is service_id-yyy-mm-dd-count, so each day a new cache is created.

The best thing about this PR is that the app.service_dao.fetch_todays_total_message_count query has been removed. This query was not performant and had been wrong for ages.

2021-06-22 16:15:36 +01:00

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