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-rw-r--r--synapse/storage/events.py1
-rw-r--r--synapse/storage/schema/delta/42/current_state_delta.sql3
2 files changed, 3 insertions, 1 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index c37a2a6f16..dfb57f9d12 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -749,6 +749,7 @@ class EventsStore(SQLBaseStore):
                             "type": key[0],
                             "state_key": key[1],
                             "event_id": ev_id,
+                            "prev_event_id": to_delete.get(key, None),
                         }
                         for key, ev_id in state_deltas.iteritems()
                     ]
diff --git a/synapse/storage/schema/delta/42/current_state_delta.sql b/synapse/storage/schema/delta/42/current_state_delta.sql
index 1a55aa912b..bf124f3def 100644
--- a/synapse/storage/schema/delta/42/current_state_delta.sql
+++ b/synapse/storage/schema/delta/42/current_state_delta.sql
@@ -19,7 +19,8 @@ CREATE TABLE current_state_delta_stream (
     room_id TEXT NOT NULL,
     type TEXT NOT NULL,
     state_key TEXT NOT NULL,
-    event_id TEXT  -- Is null if the key was removed
+    event_id TEXT,  -- Is null if the key was removed
+    prev_event_id TEXT
 );
 
 CREATE INDEX current_state_delta_stream_idx ON current_state_delta_stream(stream_id);