#1063130 Notifications: Appointment-contents won't be deleted when orphan, because

they would appear again as a notification

entity/Notification_entity/recordcontainers/db/onDBDelete.js

 import("system.vars");
 import("system.notification");
 
-// Deletes notificationContents from its table, if there are no
-notification.deleteContentIfOrphan(vars.get("$field.ID"), vars.get("$field.CONTENTID"));
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+// Deletes notificationContents from its table, if there are no user notification left
+// Only AppointmentContents need to stay, because they would appear again after every deletion.
+if(vars.get("$field.TYPECODE") != "_____SYSTEM_NOTIFICATION_APPOINTMENT")
+    notification.deleteContentIfOrphan(vars.get("$field.ID"), vars.get("$field.CONTENTID"));
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