Preserve queue filters during migration

F4SD-Cockpit-ServerCore/DataHistoryCollector.cs

@@ -508,6 +508,7 @@ namespace C4IT.DataHistoryProvider
                 // load the global parameters
                 if (!RefreshGlobalConfigurationParameters())
                     return false;
+                InfrastructureConfig.RemoveLegacyActivityFilterConfiguration();
 
                 mainDbConnection = InfrastructureConfig.HistoryDB.Connection;
 

F4SD-Cockpit-ServerCore/DataHistoryConfigInfrastructure.cs

@@ -121,12 +121,20 @@ 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;
+
+            try
+            {
+                var document = new XmlDocument();
+                document.Load(FilePath);
+                if (!(document.DocumentElement?.SelectSingleNode("Matrix42-WPM") is XmlElement matrix42))
                     return false;
 
                 var changed = false;
@@ -143,8 +151,16 @@ namespace C4IT.DataHistoryProvider
                     changed = true;
                 }
 
+                if (changed)
+                    document.Save(FilePath);
                 return changed;
             }
+            catch (Exception exception)
+            {
+                LogException(exception);
+                return false;
+            }
+        }
     }
 
     public class cDataHistoryConfigDatabase : IConfigNodeValidation