Don't hit DB for noop replications queries

1 files changed, 3 insertions, 0 deletions

diff --git a/synapse/storage/account_data.py b/synapse/storage/account_data.py

index ec7e8d40d2..3fa226e92d 100644
--- a/synapse/storage/account_data.py
+++ b/synapse/storage/account_data.py
@@ -138,6 +138,9 @@ class AccountDataStore(SQLBaseStore):
             A deferred pair of lists of tuples of stream_id int, user_id string,
             room_id string, type string, and content string.
         """
+        if last_room_id == current_id and last_global_id == current_id:
+            return defer.succeed(([], []))
+
         def get_updated_account_data_txn(txn):
             sql = (
                 "SELECT stream_id, user_id, account_data_type, content"