Index: branches/5.3.x/core/install/upgrades.sql
===================================================================
diff -u -N -r16395 -r16503
--- branches/5.3.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 16395)
+++ branches/5.3.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 16503)
@@ -2934,6 +2934,7 @@
 WHERE TemplateName LIKE 'USER%';
 
 UPDATE SystemSettings SET VariableValue = 1 WHERE VariableName = 'CSVExportEncoding';
+ALTER TABLE Semaphores ADD MainIDs INT NULL DEFAULT NULL AFTER MainPrefix;
 
 # ===== v 5.3.0-B1 =====
 ALTER TABLE ScheduledTasks ADD Settings TEXT NULL;