event_backwards_extremeties may not be empty
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@ -1411,11 +1411,21 @@ class EventsStore(SQLBaseStore):
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to_delete
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)
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txn.execute(
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"SELECT event_id FROM event_backward_extremities WHERE room_id = ?",
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(room_id,)
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)
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cur_back_event_ids = [event_id for event_id, in txn.fetchall()]
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# Update backward extremeties
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txn.executemany(
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"INSERT INTO event_backward_extremities (room_id, event_id)"
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" VALUES (?, ?)",
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[(room_id, event_id) for event_id, in new_backwards_extrems]
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[
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(room_id, event_id) for event_id, in new_backwards_extrems
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if event_id not in cur_back_event_ids
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]
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)
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txn.executemany(
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