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-rw-r--r--synapse/handlers/sync.py16
1 files changed, 13 insertions, 3 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 60a9f341b5..0ccd7d250c 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -40,6 +40,7 @@ from synapse.api.filtering import FilterCollection
 from synapse.api.presence import UserPresenceState
 from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
 from synapse.events import EventBase
+from synapse.handlers.device import DELETE_DEVICE_MSGS_TASK_NAME
 from synapse.handlers.relations import BundledAggregations
 from synapse.logging import issue9533_logger
 from synapse.logging.context import current_context
@@ -268,6 +269,7 @@ class SyncHandler:
         self._storage_controllers = hs.get_storage_controllers()
         self._state_storage_controller = self._storage_controllers.state
         self._device_handler = hs.get_device_handler()
+        self._task_scheduler = hs.get_task_scheduler()
 
         self.should_calculate_push_rules = hs.config.push.enable_push
 
@@ -360,11 +362,19 @@ class SyncHandler:
         # (since we now know that the device has received them)
         if since_token is not None:
             since_stream_id = since_token.to_device_key
-            deleted = await self.store.delete_messages_for_device(
-                sync_config.user.to_string(), sync_config.device_id, since_stream_id
+            # Delete device messages asynchronously and in batches using the task scheduler
+            await self._task_scheduler.schedule_task(
+                DELETE_DEVICE_MSGS_TASK_NAME,
+                resource_id=sync_config.device_id,
+                params={
+                    "user_id": sync_config.user.to_string(),
+                    "device_id": sync_config.device_id,
+                    "up_to_stream_id": since_stream_id,
+                },
             )
             logger.debug(
-                "Deleted %d to-device messages up to %d", deleted, since_stream_id
+                "Deletion of to-device messages up to %d scheduled",
+                since_stream_id,
             )
 
         if timeout == 0 or since_token is None or full_state: