1 files changed, 0 insertions, 5 deletions
diff --git a/synapse/storage/purge_events.py b/synapse/storage/purge_events.py
index 3c4908865f..4dcd848c59 100644
--- a/synapse/storage/purge_events.py
+++ b/synapse/storage/purge_events.py
@@ -73,9 +73,6 @@ class PurgeEventsStorage:
         Returns:
             The set of state groups that can be deleted.
         """
-        # Graph of state group -> previous group
-        graph = {}
-
         # Set of events that we have found to be referenced by events
         referenced_groups = set()
 
@@ -111,8 +108,6 @@ class PurgeEventsStorage:
             next_to_search |= prevs
             state_groups_seen |= prevs
 
-            graph.update(edges)
-
         to_delete = state_groups_seen - referenced_groups
 
         return to_delete