Add changelog entry for opentripplanner#6909 [ci skip]

Author: OTP Changelog Bot

doc/user/Changelog.md

@@ -48,6 +48,7 @@ based on merged pull requests. Search GitHub issues and pull requests for smalle
 - Handle barrier entrances correctly [#7067](https://github.com/opentripplanner/OpenTripPlanner/pull/7067)
 - Fix default via vertex name translation mapping [#7046](https://github.com/opentripplanner/OpenTripPlanner/pull/7046)
 - To fix arriveBy searches always set arriveBy property to false in transfer requests [#7089](https://github.com/opentripplanner/OpenTripPlanner/pull/7089)
+- Improve handling of realtime updated StopPatterns [#6909](https://github.com/opentripplanner/OpenTripPlanner/pull/6909)
 [](AUTOMATIC_CHANGELOG_PLACEHOLDER_DO_NOT_REMOVE)
 
 ## 2.8.1 (2025-09-22)