pkp/pkp-lib#3412 Clean up notifications on announcement deletion

dbscripts/xml/upgrade/3.1.1_update.xml

@@ -49,4 +49,9 @@
 		<query driver="postgres7">UPDATE users SET citations = us. groupedGossips FROM (SELECT user_id, string_agg(DISTINCT setting_value, ' ') AS groupedGossips FROM user_settings WHERE setting_name = 'gossip' AND setting_value &lt;&gt; '' GROUP BY user_id) AS us WHERE us.user_id = users.user_id</query>
 		<query>DELETE FROM user_settings WHERE setting_name="gossip"</query>
 	</sql>
+	<sql><!-- pkp/pkp-lib#3412 Clean up notifications left over from deleted announcements -->
+		<query driver="mysql">DELETE n FROM notifications n LEFT JOIN announcements a ON (n.assoc_id = a.announcement_id) WHERE a.announcement_id IS NULL AND n.assoc_type = 522</query><!-- ASSOC_TYPE_ANNOUNCEMENT -->
+		<query driver="mysqli">DELETE n FROM notifications n LEFT JOIN announcements a ON (n.assoc_id = a.announcement_id) WHERE a.announcement_id IS NULL AND n.assoc_type = 522</query><!-- ASSOC_TYPE_ANNOUNCEMENT -->
+		<query driver="postgres7">DELETE FROM notifications USING notifications n LEFT JOIN announcements a ON (n.assoc_id = a.announcement_id) WHERE a.announcement_id IS NULL AND n.assoc_type = 522 AND notifications.notification_id = n.notification_id</query><!-- ASSOC_TYPE_ANNOUNCEMENT -->
+	</sql>
 </data>