Some fixes for #847 (#850)

* Fix a couple of cases where backfilling events we already had causes panics, hopefully fix ordering of events, update GMSL dependency for backfill URL fixes

* Remove commented out lines from output_room_events_table schema

1 files changed, 382 insertions, 75 deletions

diff --git a/go.sum b/go.sum
index 80d03419..b501d497 100644
--- a/go.sum
+++ b/go.sum
@@ -1,147 +1,378 @@
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