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-rw-r--r--synapse/storage/events.py3
-rw-r--r--synapse/storage/events_worker.py20
2 files changed, 23 insertions, 0 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index ece5e6c41f..da44b52fd6 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -444,6 +444,9 @@ class EventsStore(EventsWorkerStore):
                     new_forward_extremeties=new_forward_extremeties,
                 )
                 persist_event_counter.inc_by(len(chunk))
+                synapse.metrics.event_persisted_position.set(
+                    chunk[-1][0].internal_metadata.stream_ordering,
+                )
                 for event, context in chunk:
                     if context.app_service:
                         origin_type = "local"
diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py
index 2e23dd78ba..a937b9bceb 100644
--- a/synapse/storage/events_worker.py
+++ b/synapse/storage/events_worker.py
@@ -51,6 +51,26 @@ _EventCacheEntry = namedtuple("_EventCacheEntry", ("event", "redacted_event"))
 
 
 class EventsWorkerStore(SQLBaseStore):
+    def get_received_ts(self, event_id):
+        """Get received_ts (when it was persisted) for the event.
+
+        Raises an exception for unknown events.
+
+        Args:
+            event_id (str)
+
+        Returns:
+            Deferred[int|None]: Timestamp in milliseconds, or None for events
+            that were persisted before received_ts was implemented.
+        """
+        return self._simple_select_one_onecol(
+            table="events",
+            keyvalues={
+                "event_id": event_id,
+            },
+            retcol="received_ts",
+            desc="get_received_ts",
+        )
 
     @defer.inlineCallbacks
     def get_event(self, event_id, check_redacted=True,