Preserve queue filters during migration

F4SD-Cockpit-ServerCore/DataHistoryConfigInfrastructure.cs

@@ -121,29 +121,45 @@ namespace C4IT.DataHistoryProvider
             return false;
         }
 
-        public override bool DoXmlUpdates(XmlElement xmlRoot, bool withM42Config = false, bool withIntuneConfig = false, bool withMobileDeviceConfig = false, bool withCitrixConfig = false)
+        internal bool RemoveLegacyActivityFilterConfiguration()
         {
             // Queue filtering moved to the provider-neutral global ActivityFilters policy.
-            // InstantiateProperties runs first, so the values remain available for the
-            // one-time migration while the obsolete XML is removed.
-            if (!(xmlRoot.SelectSingleNode("Matrix42-WPM") is XmlElement matrix42))
+            // This intentionally runs only after the global configuration was loaded:
+            // DoXmlUpdates runs before InstantiateProperties and would otherwise erase
+            // the values before the one-time migration can read them.
+            if (string.IsNullOrWhiteSpace(FilePath))
                 return false;
 
-            var changed = false;
-            if (matrix42.HasAttribute("ActivityQueueFilter"))
+            try
             {
-                matrix42.RemoveAttribute("ActivityQueueFilter");
-                changed = true;
-            }
+                var document = new XmlDocument();
+                document.Load(FilePath);
+                if (!(document.DocumentElement?.SelectSingleNode("Matrix42-WPM") is XmlElement matrix42))
+                    return false;
 
-            var queues = matrix42.SelectSingleNode("Queues");
-            if (queues != null)
+                var changed = false;
+                if (matrix42.HasAttribute("ActivityQueueFilter"))
+                {
+                    matrix42.RemoveAttribute("ActivityQueueFilter");
+                    changed = true;
+                }
+
+                var queues = matrix42.SelectSingleNode("Queues");
+                if (queues != null)
+                {
+                    matrix42.RemoveChild(queues);
+                    changed = true;
+                }
+
+                if (changed)
+                    document.Save(FilePath);
+                return changed;
+            }
+            catch (Exception exception)
             {
-                matrix42.RemoveChild(queues);
-                changed = true;
+                LogException(exception);
+                return false;
             }
-
-            return changed;
         }
     }