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-rw-r--r--synapse/storage/data_stores/main/receipts.py13
1 files changed, 4 insertions, 9 deletions
diff --git a/synapse/storage/data_stores/main/receipts.py b/synapse/storage/data_stores/main/receipts.py
index 0d932a0672..cebdcd409f 100644
--- a/synapse/storage/data_stores/main/receipts.py
+++ b/synapse/storage/data_stores/main/receipts.py
@@ -391,7 +391,7 @@ class ReceiptsStore(ReceiptsWorkerStore):
             (user_id, room_id, receipt_type),
         )
 
-        self.db.simple_delete_txn(
+        self.db.simple_upsert_txn(
             txn,
             table="receipts_linearized",
             keyvalues={
@@ -399,19 +399,14 @@ class ReceiptsStore(ReceiptsWorkerStore):
                 "receipt_type": receipt_type,
                 "user_id": user_id,
             },
-        )
-
-        self.db.simple_insert_txn(
-            txn,
-            table="receipts_linearized",
             values={
                 "stream_id": stream_id,
-                "room_id": room_id,
-                "receipt_type": receipt_type,
-                "user_id": user_id,
                 "event_id": event_id,
                 "data": json.dumps(data),
             },
+            # receipts_linearized has a unique constraint on
+            # (user_id, room_id, receipt_type), so no need to lock
+            lock=False,
         )
 
         if receipt_type == "m.read" and stream_ordering is not None: