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-rw-r--r--changelog.d/10537.misc1
-rw-r--r--synapse/rest/client/v1/room.py15
2 files changed, 11 insertions, 5 deletions
diff --git a/changelog.d/10537.misc b/changelog.d/10537.misc
new file mode 100644
index 0000000000..c9e045300c
--- /dev/null
+++ b/changelog.d/10537.misc
@@ -0,0 +1 @@
+Mark all events stemming from the MSC2716 `/batch_send` endpoint as historical.
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 502a917588..982f134148 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -458,6 +458,9 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
                 "state_key": state_event["state_key"],
             }
 
+            # Mark all events as historical
+            event_dict["content"][EventContentFields.MSC2716_HISTORICAL] = True
+
             # Make the state events float off on their own
             fake_prev_event_id = "$" + random_string(43)
 
@@ -562,7 +565,10 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
             "type": EventTypes.MSC2716_CHUNK,
             "sender": requester.user.to_string(),
             "room_id": room_id,
-            "content": {EventContentFields.MSC2716_CHUNK_ID: chunk_id_to_connect_to},
+            "content": {
+                EventContentFields.MSC2716_CHUNK_ID: chunk_id_to_connect_to,
+                EventContentFields.MSC2716_HISTORICAL: True,
+            },
             # Since the chunk event is put at the end of the chunk,
             # where the newest-in-time event is, copy the origin_server_ts from
             # the last event we're inserting
@@ -589,10 +595,6 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
         for ev in events_to_create:
             assert_params_in_dict(ev, ["type", "origin_server_ts", "content", "sender"])
 
-            # Mark all events as historical
-            # This has important semantics within the Synapse internals to backfill properly
-            ev["content"][EventContentFields.MSC2716_HISTORICAL] = True
-
             event_dict = {
                 "type": ev["type"],
                 "origin_server_ts": ev["origin_server_ts"],
@@ -602,6 +604,9 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
                 "prev_events": prev_event_ids.copy(),
             }
 
+            # Mark all events as historical
+            event_dict["content"][EventContentFields.MSC2716_HISTORICAL] = True
+
             event, context = await self.event_creation_handler.create_event(
                 await self._create_requester_for_user_id_from_app_service(
                     ev["sender"], requester.app_service