David McDonald 085e3a8435 Make deleting of notifications to be sequential ...

Based on this https://github.com/alphagov/notifications-api/pull/2788
where some concerns were raised. This should be a quicker fix to get our
the deletions to run sequentially for all the notification types. Note,
email is first as most important as makes up the larger numbers (we
wouldn't want it to start with SMS, fail half way for a reason that only
affects SMS and for that to affect the email deletion).

We hope that by running sequentially we will reduce conflicts writing to
the same index and this will speed up the total time it takes to finish
deleting all notification types older than their retention time. There
is a risk that whilst quicker per job, as they now run sequentially
rather than potentially overlapping, they will take longer overall. We
will need to monitor to see.

2020-04-07 17:03:17 +01:00

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