6592: Updated changelog

Author: tuj

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [2.6.1] - 2026-03-06
+
 - [#347](https://github.com/os2display/display-api-service/pull/347)
   - Added onFlush listener to handle ManyToMany collection changes for relations checksum propagation.
   - Added command to refresh relation checksums.