add context in docstring and comment

rasa/core/exporter.py

@@ -243,6 +243,7 @@ async def _fetch_events_within_time_range(self) -> AsyncIterator[Dict[Text, Any]
             events = self._get_events_for_conversation_id(_events, conversation_id)
 
             # the order of events was changed after ATO-2192
+            # more context: https://github.com/RasaHQ/rasa/pull/13019
             # we should sort the events by timestamp to keep the order
             events.sort(key=lambda x: x["timestamp"])
 

rasa/core/tracker_store.py

@@ -1291,6 +1291,9 @@ def _event_query(
         self, session: "Session", sender_id: Text, fetch_events_from_all_sessions: bool
     ) -> "Query":
         """Provide the query to retrieve the conversation events for a specific sender.
+        The events are ordered by ID to ensure correct sequence of events.
+        As `timestamp` is not guaranteed to be unique and low-precision (float), it
+        cannot be used to order the events.
 
         Args:
             session: Current database session.