Index: lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/dbupdates/patch20150928.sql
===================================================================
diff -u
--- lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/dbupdates/patch20150928.sql	(revision 0)
+++ lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/dbupdates/patch20150928.sql	(revision 4009b3e6ac274a76b6de4bb4a664ef20ec76b330)
@@ -0,0 +1,14 @@
+-- Turn off autocommit, so nothing is committed if there is an error
+SET AUTOCOMMIT = 0;
+SET FOREIGN_KEY_CHECKS=0;
+----------------------Put all sql statements below here-------------------------
+
+--  LDEV-3564 session_id must be unique
+ALTER IGNORE TABLE tl_laasse10_session ADD UNIQUE (session_id);
+
+----------------------Put all sql statements above here-------------------------
+
+-- If there were no errors, commit and restore autocommit to on
+COMMIT;
+SET AUTOCOMMIT = 1;
+SET FOREIGN_KEY_CHECKS=1;
\ No newline at end of file