add an update script to add StateId to Events table

db/zm_update-1.30.2.sql

@@ -0,0 +1,20 @@
+--
+-- This updates a 1.30.1 database to 1.30.2
+--
+-- Add StateId Column to Events.
+--
+
+SET @s = (SELECT IF(
+    (SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE table_name = 'Events'
+    AND table_schema = DATABASE()
+    AND column_name = 'StateId'
+    ) > 0,
+"SELECT 'Column StateId exists in Events'",
+"ALTER TABLE Events ADD `StateId` int(10) unsigned default NULL AFTER `Notes`"
+));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;
+