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@ -1872,6 +1872,9 @@ class EventsStore(EventsWorkerStore):
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"CREATE INDEX events_to_purge_should_delete"
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" ON events_to_purge(should_delete)",
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)
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# We do joins against events_to_purge for e.g. calculating state
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# groups to purge, etc., so lets make an index.
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txn.execute(
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"CREATE INDEX events_to_purge_id"
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" ON events_to_purge(event_id)",
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@ -2119,6 +2122,11 @@ class EventsStore(EventsWorkerStore):
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#
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# So, let's stick it at the end so that we don't block event
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# persistence.
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#
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# We do this by calculating the minimum depth of the backwards
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# extremities. However, the events in event_backward_extremities
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# are ones we don't have yet so we need to look at the events that
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# point to it via event_edges table.
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txn.execute("""
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SELECT COALESCE(MIN(depth), 0)
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FROM event_backward_extremities AS eb
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