mark event persistence as beta

Author: singhpk234

site/content/downloads/_index.md

@@ -55,7 +55,9 @@ Apache Polaris 1.2.0-incubating was released on October 23rd, 2025.
     The realm-level feature flag `ALLOW_SETTING_SUB_CATALOG_RBAC_FOR_FEDERATED_CATALOGS` (default: true) controls whether this functionality can be enabled or modified at the catalog level.
   - Added support for S3-compatible storage that does not have STS (use `stsUavailable: true` in catalog storage configuration)
   - Added a Management API endpoint to reset principal credentials, controlled by the `ENABLE_CREDENTIAL_RESET` (default: true) feature flag.
-  - Added AWS CloudWatch Event Sink Implementation
+  - **Events Persistence (Preview)**: Introduced new event types and added support for persisting events to both Relational JDBC Persistence and AWS CloudWatch.
+  
+    **Note**: This is a preview feature. The persistence schema is subject to change in future releases, and previously stored event data MAY become unreadable (i.e., dropped) after an upgrade.
   - Generate Request IDs (if not specified) for all incoming requests to Polaris.
 
 - **Changes**