Chris Hill-Scott f691bc2a92 Only lookup broadcasts which can be cancelled ...

It is possible that, among the references Environment Agency give us for
which broadcast to cancel, there could be references for older, already
expired broadcasts.

This would be the case if someone cancelled a broadcast in Notify, then
issued and try to re-cancel another broadcast to the same area. The
Flood Warning Service has no way of knowing that the first broadcast has
been cancelled in Notify already, so it would add the reference to the
list of things to be cancelled.

We can avoid this from happening by filtering-out already-cancelled and
expired broadcasts before looking up which one should be cancelled.

2022-02-17 15:23:13 +00:00

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