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-rw-r--r--synapse/storage/schema/full_schemas/16/state.sql2
-rw-r--r--synapse/storage/state.py2
2 files changed, 2 insertions, 2 deletions
diff --git a/synapse/storage/schema/full_schemas/16/state.sql b/synapse/storage/schema/full_schemas/16/state.sql
index 8d6b94a616..8c51610396 100644
--- a/synapse/storage/schema/full_schemas/16/state.sql
+++ b/synapse/storage/schema/full_schemas/16/state.sql
@@ -14,7 +14,7 @@
  */
 
 CREATE TABLE IF NOT EXISTS state_groups(
-    id VARCHAR(20) PRIMARY KEY,
+    id BIGINT UNSIGNED PRIMARY KEY,
     room_id VARCHAR(150) NOT NULL,
     event_id VARCHAR(150) NOT NULL
 );
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 4994bacd6c..553ba9dd1f 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -93,7 +93,7 @@ class StateStore(SQLBaseStore):
 
         state_group = context.state_group
         if not state_group:
-            state_group = _make_group_id(self._clock)
+            state_group = self._state_groups_id_gen.get_next_txn(txn)
             self._simple_insert_txn(
                 txn,
                 table="state_groups",