Update where the stream marker gets set to avoid the possibility of duplicate messages during the transition.

pnut-bridge.py

@@ -196,9 +196,11 @@ class ChannelMonitor(threading.Thread):
         # update the last message id
         if len(messages) > 0:
             room.pnut_since = messages[0].id
+            db.session.commit()
+
+        # update the stream marker
         if 'max_id' in meta:
             self.update_marker(room.pnut_chan, meta.max_id)
-            db.session.commit()
 
         # empty the queue to the matrix room
         for item in pqueue: