Fix port script fails when DB has no backfilled events.

Fixes #8618
matrix-org · Nov 6, 2020 · c646698 · c646698
1 parent 2a6b685
commit c646698
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/scripts/synapse_port_db b/scripts/synapse_port_db
@@ -820,7 +820,7 @@ class Porter(object):
                     "ALTER SEQUENCE events_stream_seq RESTART WITH %s", (next_id,)
                 )
 
-            txn.execute("SELECT -MIN(stream_ordering) FROM events")
+            txn.execute("SELECT GREATEST(-MIN(stream_ordering), 1) FROM events")
             curr_id = txn.fetchone()[0]
             if curr_id:
                 next_id = curr_id + 1