In the offline message table, store the sender.

This data is useful for preventing abuse (e.g., someone who sends too many messages), or for deleting message if their sender has been deleted.

OpenSim/Data/MySQL/Resources/IM_Store.migrations

@@ -21,4 +21,14 @@ INSERT INTO `im_offline` SELECT * from `diva_im_offline`;
 DROP TABLE `diva_im_offline`;
 DELETE FROM `migrations` WHERE name='diva_im_Store';
 
-COMMIT;
+COMMIT;
+
+:VERSION 3         # -------------------------- 
+
+BEGIN;
+
+ALTER TABLE `im_offline`
+  ADD `FromID` char(36) NOT NULL default '' AFTER `PrincipalID`,
+  ADD KEY `FromID` (`FromID`);
+
+COMMIT;