Document BatchStorer.Default implementation, highlighting synchronization and background flush process.

Author: fh-ms

persistence/persistence/src/main/java/org/eclipse/serializer/persistence/util/BatchStorer.java

@@ -173,6 +173,13 @@ public static BatchStorer New(final Storer delegate, final Controller controller
     }
 
 
+    /**
+     * Default implementation of {@link BatchStorer}.
+     * <p>
+     * All store operations are synchronized to ensure thread safety.
+     * A background daemon thread periodically checks for pending data
+     * and flushes it according to the configured {@link Controller}.
+     */
     public static class Default implements BatchStorer
     {
         private final static Logger logger = Logging.getLogger(BatchStorer.class);