This is necessary until:
- The Admin app is using the new "areas(_2)" format to store and
retrieve data.
- We've migrated all existing broadcast messages to use the new
format.
Note that "areas" / "ids" isn't actually used for anything except
printing out the PagerDuty message - it's not sent to the proxy [1].
[1]: 6edc6c70aa/app/celery/broadcast_message_tasks.py (L190-L193)
Regardless of channel.
Do not include:
- broadcasts older than 25.05.2021
- stubbed broadcasts
- broadcasts that were not transmitted. So only broadcasting,
cancelled and completed make the list;
replacing get_earlier_provider_messages. The old function returned the
previous references for earlier events for a broadcast_message. However,
these depend on the message sent to a specific provider, so the function
needs to change. It now takes in a provider, and only returns
broadcast_provider_messages sent to that provider. If there are earlier
broadcast_events without a provider_message for the chosen provider, it
raises an exception - you cannot cancel a message if all the previous
events have not been created properly (as we wouldn't know what
references to cancel).
(instead of using the id from broadcast_event)
we need every XML blob we send to have a different ID. if we're sending
different XML blobs for each provider, then each one should have a
different identifier. So, instead of taking the identifier from the
broadcast_event, take it from the broadcast_provider_message instead.
Note: We're still going to the broadcast_event for most fields, to
ensure they stay consistent between different providers. The last thing
we want is for different phone networks to get different content
