diff --git a/AGENTS.md b/AGENTS.md
index d559c62e..e571adbd 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -113,12 +113,12 @@ Plugins can configure:
 - etc.
 
 Configuration plugins provide three kinds of values:
-- **Managed settings:** simple values such as booleans, numbers, strings, enums, lists, or sets handled through `ManagedConfiguration`. These values may be locked or used as organization defaults.
+- **Managed settings:** simple values such as booleans, numbers, strings, enums, lists, or sets handled through `ManagedConfiguration`. These values may be locked or used as organization defaults. Which configuration plugin owns a locked setting is persisted in `Data.ManagedLockedConfigurations`, and organization defaults are tracked in `Data.ManagedEditableDefaults`. Both are cleaned up generically by `ManagedConfiguration.CleanupLeftOverManagedConfigurations(...)` when the owning plugin is gone.
 - **Managed configuration objects:** complex Lua tables that are persisted into `SettingsManager.ConfigurationData`, implement `IConfigurationObject`, and are cleaned up through `PluginConfigurationObject.CleanLeftOverConfigurationObjects(...)`. Examples include providers, profiles, chat templates, data sources, and document analysis policies.
 - **Live plugin content:** complex Lua tables that implement `ILivePluginContent` and are read live from running plugins instead of being persisted to `ConfigurationData`. Examples include `MANDATORY_INFOS` and `INTRODUCTIONS`. If live plugin content creates persistent side data, add a dedicated cleanup path for that side data, like mandatory-info acceptances.
 
 When adding configuration plugin capabilities:
-- For managed settings, update the corresponding data class in `app/MindWork AI Studio/Settings/DataModel/` to call `ManagedConfiguration.Register(...)`, process the setting in `PluginConfiguration.TryProcessConfiguration`, and check for leftover managed configuration in `PluginFactory.Loading.LoadAll`.
+- For managed settings, update the corresponding data class in `app/MindWork AI Studio/Settings/DataModel/` to call `ManagedConfiguration.Register(...)` and process the setting in `PluginConfiguration.TryProcessConfiguration`. Cleaning up the setting when its configuration plugin was removed needs no extra step: `ManagedConfiguration.CleanupLeftOverManagedConfigurations(...)` iterates all registered settings. Do not add per-setting cleanup calls to `PluginFactory.Loading.LoadAll`.
 - For managed configuration objects, update `PluginConfigurationObject.cs` and `PluginConfigurationObjectType.cs`, persist them in the appropriate `ConfigurationData` collection, and add cleanup via `PluginConfigurationObject.CleanLeftOverConfigurationObjects(...)`.
 - For live plugin content, add a data type implementing `ILivePluginContent`, parse it in `PluginConfiguration`, expose it through `PluginFactory`, and add any required cleanup only for persistent side data.
 - Always document the new capability in `app/MindWork AI Studio/Plugins/configuration/plugin.lua`.
diff --git a/app/MindWork AI Studio/Settings/ManagedConfiguration.Parsing.cs b/app/MindWork AI Studio/Settings/ManagedConfiguration.Parsing.cs
index 2aea5f96..df146bbe 100644
--- a/app/MindWork AI Studio/Settings/ManagedConfiguration.Parsing.cs	
+++ b/app/MindWork AI Studio/Settings/ManagedConfiguration.Parsing.cs	
@@ -924,8 +924,8 @@ public static partial class ManagedConfiguration
                 // case only when the setting was locked and managed by the same configuration plugin.
                 //
                 // The other case, when the setting was locked and managed by a different configuration plugin,
-                // is handled by the IsConfigurationLeftOver method, which checks if the configuration plugin
-                // is still available. If it is not available, it resets the locked state of the
+                // is handled by the CleanupLeftOverManagedConfigurations method, which checks if the configuration
+                // plugin is still available. If it is not available, it resets the locked state of the
                 // configuration setting, allowing it to be reconfigured by a different plugin or left unchanged.
                 //
                 configMeta.ResetLockedConfiguration();
diff --git a/app/MindWork AI Studio/Settings/ManagedConfiguration.Register.cs b/app/MindWork AI Studio/Settings/ManagedConfiguration.Register.cs
index fad65bd0..4049cc0f 100644
--- a/app/MindWork AI Studio/Settings/ManagedConfiguration.Register.cs	
+++ b/app/MindWork AI Studio/Settings/ManagedConfiguration.Register.cs	
@@ -19,10 +19,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the property within the configuration class.</typeparam>
     /// <returns>The default value.</returns>
-    public static TValue Register<TClass, TValue>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, TValue>> propertyExpression,
-        TValue defaultValue)
+    public static TValue Register<TClass, TValue>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, TValue>> propertyExpression, TValue defaultValue)
         where TValue : struct
     {
         // When called from the JSON deserializer by using the standard constructor,
@@ -57,10 +54,7 @@ public static partial class ManagedConfiguration
     /// <param name="defaultValue">The default value to use when the setting is not configured.</param>
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <returns>The default value.</returns>
-    public static string Register<TClass>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, string>> propertyExpression,
-        string defaultValue)
+    public static string Register<TClass>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, string>> propertyExpression, string defaultValue)
     {
         // When called from the JSON deserializer by using the standard constructor,
         // we ignore the register call and return the default value:
@@ -95,10 +89,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the elements in the list within the configuration class.</typeparam>
     /// <returns>A list containing the default value.</returns>
-    public static List<TValue> Register<TClass, TValue>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, IList<TValue>>> propertyExpression,
-        TValue defaultValue)
+    public static List<TValue> Register<TClass, TValue>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, IList<TValue>>> propertyExpression, TValue defaultValue)
     {
         // When called from the JSON deserializer by using the standard constructor,
         // we ignore the register call and return the default value:
@@ -133,10 +124,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the elements within the property list.</typeparam>
     /// <returns>The list of default values.</returns>
-    public static List<TValue> Register<TClass, TValue>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, IList<TValue>>> propertyExpression,
-        IList<TValue> defaultValues)
+    public static List<TValue> Register<TClass, TValue>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, IList<TValue>>> propertyExpression, IList<TValue> defaultValues)
     {
         // When called from the JSON deserializer by using the standard constructor,
         // we ignore the register call and return the default value:
@@ -170,10 +158,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the values within the set.</typeparam>
     /// <returns>A set containing the default value.</returns>
-    public static HashSet<TValue> Register<TClass, TValue>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, ISet<TValue>>> propertyExpression,
-        TValue defaultValue)
+    public static HashSet<TValue> Register<TClass, TValue>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, ISet<TValue>>> propertyExpression, TValue defaultValue)
     {
         // When called from the JSON deserializer by using the standard constructor,
         // we ignore the register call and return the default value:
@@ -208,10 +193,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class from which the property is selected.</typeparam>
     /// <typeparam name="TValue">The type of the elements in the collection associated with the configuration property.</typeparam>
     /// <returns>A set containing the default values.</returns>
-    public static HashSet<TValue> Register<TClass, TValue>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, ISet<TValue>>> propertyExpression,
-        IList<TValue> defaultValues)
+    public static HashSet<TValue> Register<TClass, TValue>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, ISet<TValue>>> propertyExpression, IList<TValue> defaultValues)
     {
         // When called from the JSON deserializer by using the standard constructor,
         // we ignore the register call and return the default value:
@@ -246,10 +228,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class from which the property is selected.</typeparam>
     /// <typeparam name="TDict">>The type of the dictionary within the configuration class.</typeparam>
     /// <returns>A dictionary containing the default values.</returns>
-    public static TDict Register<TClass, TDict>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, IDictionary<string, string>>> propertyExpression,
-        TDict defaultValues)
+    public static TDict Register<TClass, TDict>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, IDictionary<string, string>>> propertyExpression, TDict defaultValues)
         where TDict : IDictionary<string, string>, new()
     {
         // When called from the JSON deserializer by using the standard constructor,
@@ -286,10 +265,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TKey">The enum type of the dictionary keys.</typeparam>
     /// <typeparam name="TValue">The enum type of the dictionary values.</typeparam>
     /// <returns>A dictionary containing the default values.</returns>
-    public static Dictionary<TKey, TValue> Register<TClass, TKey, TValue>(
-        Expression<Func<Data, TClass>>? configSelection,
-        Expression<Func<TClass, Dictionary<TKey, TValue>>> propertyExpression,
-        Dictionary<TKey, TValue> defaultValues)
+    public static Dictionary<TKey, TValue> Register<TClass, TKey, TValue>(Expression<Func<Data, TClass>>? configSelection, Expression<Func<TClass, Dictionary<TKey, TValue>>> propertyExpression, Dictionary<TKey, TValue> defaultValues)
         where TKey : struct, Enum
         where TValue : struct, Enum
     {
diff --git a/app/MindWork AI Studio/Settings/ManagedConfiguration.cs b/app/MindWork AI Studio/Settings/ManagedConfiguration.cs
index f217a793..174aa001 100644
--- a/app/MindWork AI Studio/Settings/ManagedConfiguration.cs	
+++ b/app/MindWork AI Studio/Settings/ManagedConfiguration.cs	
@@ -9,7 +9,10 @@ namespace AIStudio.Settings;
 public static partial class ManagedConfiguration
 {
     private static readonly ConcurrentDictionary<string, IConfig> METADATA = new();
+    
     private static SettingsManager SettingsManagerAccess => Program.SERVICE_PROVIDER.GetRequiredService<SettingsManager>();
+    
+    private static ILogger Log => Program.LOGGER_FACTORY.CreateLogger(nameof(ManagedConfiguration));
 
     /// <summary>
     /// Attempts to retrieve the configuration metadata for a given configuration selection and
@@ -28,10 +31,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the property within the configuration class.</typeparam>
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
-    public static bool TryGet<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, TValue>> propertyExpression,
-        out ConfigMeta<TClass, TValue> configMeta)
+    public static bool TryGet<TClass, TValue>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, TValue>> propertyExpression, out ConfigMeta<TClass, TValue> configMeta)
         where TValue : Enum
     {
         var configPath = Path(configSelection, propertyExpression);
@@ -66,10 +66,7 @@ public static partial class ManagedConfiguration
     /// if found.</param>
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
-    public static bool TryGet<TClass>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, string>> propertyExpression,
-        out ConfigMeta<TClass, string> configMeta)
+    public static bool TryGet<TClass>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, string>> propertyExpression, out ConfigMeta<TClass, string> configMeta)
     {
         var configPath = Path(configSelection, propertyExpression);
         if (METADATA.TryGetValue(configPath, out var value) && value is ConfigMeta<TClass, string> meta)
@@ -106,11 +103,7 @@ public static partial class ManagedConfiguration
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
 
     // ReSharper disable MethodOverloadWithOptionalParameter
-    public static bool TryGet<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, TValue>> propertyExpression,
-        out ConfigMeta<TClass, TValue> configMeta,
-        ISpanParsable<TValue>? _ = null)
+    public static bool TryGet<TClass, TValue>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, TValue>> propertyExpression, out ConfigMeta<TClass, TValue> configMeta, ISpanParsable<TValue>? _ = null)
         where TValue : struct, ISpanParsable<TValue>
     {
         var configPath = Path(configSelection, propertyExpression);
@@ -146,10 +139,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the property within the configuration class.</typeparam>
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
-    public static bool TryGet<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, IList<TValue>>> propertyExpression,
-        out ConfigMeta<TClass, IList<TValue>> configMeta)
+    public static bool TryGet<TClass, TValue>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, IList<TValue>>> propertyExpression, out ConfigMeta<TClass, IList<TValue>> configMeta)
     {
         var configPath = Path(configSelection, propertyExpression);
         if (METADATA.TryGetValue(configPath, out var value) && value is ConfigMeta<TClass, IList<TValue>> meta)
@@ -182,10 +172,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <typeparam name="TValue">The type of the property within the configuration class.</typeparam>
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
-    public static bool TryGet<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, ISet<TValue>>> propertyExpression,
-        out ConfigMeta<TClass, ISet<TValue>> configMeta)
+    public static bool TryGet<TClass, TValue>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, ISet<TValue>>> propertyExpression, out ConfigMeta<TClass, ISet<TValue>> configMeta)
     {
         var configPath = Path(configSelection, propertyExpression);
         if (METADATA.TryGetValue(configPath, out var value) && value is ConfigMeta<TClass, ISet<TValue>> meta)
@@ -217,10 +204,7 @@ public static partial class ManagedConfiguration
     /// if found.</param>
     /// <typeparam name="TClass">The type of the configuration class.</typeparam>
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
-    public static bool TryGet<TClass>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, IDictionary<string, string>>> propertyExpression,
-        out ConfigMeta<TClass, IDictionary<string, string>> configMeta)
+    public static bool TryGet<TClass>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, IDictionary<string, string>>> propertyExpression, out ConfigMeta<TClass, IDictionary<string, string>> configMeta)
     {
         var configPath = Path(configSelection, propertyExpression);
         if (METADATA.TryGetValue(configPath, out var value) && value is ConfigMeta<TClass, IDictionary<string, string>> meta)
@@ -254,10 +238,7 @@ public static partial class ManagedConfiguration
     /// <typeparam name="TKey">The enum type of the dictionary keys.</typeparam>
     /// <typeparam name="TValue">The enum type of the dictionary values.</typeparam>
     /// <returns>True if the configuration metadata was found, otherwise false.</returns>
-    public static bool TryGet<TClass, TKey, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, Dictionary<TKey, TValue>>> propertyExpression,
-        out ConfigMeta<TClass, Dictionary<TKey, TValue>> configMeta)
+    public static bool TryGet<TClass, TKey, TValue>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, Dictionary<TKey, TValue>>> propertyExpression, out ConfigMeta<TClass, Dictionary<TKey, TValue>> configMeta)
         where TKey : struct, Enum
         where TValue : struct, Enum
     {
@@ -277,211 +258,94 @@ public static partial class ManagedConfiguration
     }
 
     /// <summary>
-    /// Checks if a configuration setting is left over from a configuration plugin that is no longer available.
-    /// If the configuration setting is locked and managed by a configuration plugin that is not available,
-    /// it resets the managed state of the configuration setting and returns true.
-    /// Otherwise, it returns false.
+    /// Removes all managed states whose configuration plugin is not available anymore.
     /// </summary>
-    /// <param name="configSelection">The expression to select the configuration class.</param>
-    /// <param name="propertyExpression">The expression to select the property within the configuration class.</param>
+    /// <remarks>
+    /// This covers every registered setting, regardless of its type: locked settings, editable
+    /// defaults, and additive plugin contributions. Settings do not need to be listed anywhere for
+    /// this cleanup to work, so adding a new managed setting cannot be forgotten here.<br/><br/>
+    /// A locked setting whose plugin is gone is reset to its default value. That is intended: the
+    /// value belonged to the organization, not to the user, and the user might not be able to
+    /// change it at all.
+    /// </remarks>
     /// <param name="availablePlugins">The collection of available plugins to check against.</param>
-    /// <typeparam name="TClass">The type of the configuration class.</typeparam>
-    /// <typeparam name="TValue">The type of the property within the configuration class.</typeparam>
-    /// <returns>True if the configuration setting is left over and was reset, otherwise false.</returns>
-    public static bool IsConfigurationLeftOver<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, TValue>> propertyExpression,
-        IReadOnlyList<IAvailablePlugin> availablePlugins)
-        where TValue : Enum
+    /// <returns>True when at least one setting was changed, otherwise false.</returns>
+    public static bool CleanupLeftOverManagedConfigurations(IReadOnlyCollection<IAvailablePlugin> availablePlugins)
     {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
+        var wasChanged = false;
+        var registeredSettingNames = new HashSet<string>(StringComparer.Ordinal);
 
-        if (configMeta.LockedByConfigPluginId != Guid.Empty && configMeta.IsLocked)
+        foreach (var config in METADATA.Values)
         {
-            var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-            if (plugin is null)
+            if (config is not ConfigMetaBase configMeta)
+                continue;
+
+            registeredSettingNames.Add(configMeta.SettingName);
+
+            //
+            // Restore the persisted ownership first. Otherwise, we would not recognize a left-over
+            // lock when nobody has read this setting since the settings were loaded:
+            //
+            configMeta.RestoreLockedConfiguration();
+
+            // Check the locked state:
+            if (configMeta.IsLocked && configMeta.LockedByConfigPluginId != Guid.Empty && !IsPluginAvailable(configMeta.LockedByConfigPluginId, availablePlugins))
             {
+                Log.LogInformation($"Resetting the setting '{configMeta.SettingName}': it was locked by the configuration plugin '{configMeta.LockedByConfigPluginId}', which is not available anymore.");
                 configMeta.ResetLockedConfiguration();
-                return true;
+                wasChanged = true;
+            }
+
+            // Check the editable default state:
+            if (CleanupEditableDefaultState(configMeta, availablePlugins))
+                wasChanged = true;
+
+            // Check the additive plugin contribution:
+            if (configMeta.HasPluginContribution && configMeta.PluginContributionByConfigPluginId != Guid.Empty && !IsPluginAvailable(configMeta.PluginContributionByConfigPluginId, availablePlugins))
+            {
+                Log.LogInformation($"Clearing the plugin contribution for the setting '{configMeta.SettingName}': the configuration plugin '{configMeta.PluginContributionByConfigPluginId}' is not available anymore.");
+                configMeta.ClearPluginContribution();
+                wasChanged = true;
             }
         }
 
-        return CleanupEditableDefaultState(configMeta, SettingName(propertyExpression), availablePlugins);
+        // Remove persisted states which belong to settings that do not exist anymore:
+        if (RemoveUnknownManagedStates(registeredSettingNames))
+            wasChanged = true;
+
+        return wasChanged;
     }
 
-    public static bool IsConfigurationLeftOver<TClass>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, string>> propertyExpression,
-        IReadOnlyList<IAvailablePlugin> availablePlugins)
-    {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
-
-        if (configMeta.LockedByConfigPluginId != Guid.Empty && configMeta.IsLocked)
-        {
-            var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-            if (plugin is null)
-            {
-                configMeta.ResetLockedConfiguration();
-                return true;
-            }
-        }
-
-        return CleanupEditableDefaultState(configMeta, SettingName(propertyExpression), availablePlugins);
-    }
-
-    // ReSharper disable MethodOverloadWithOptionalParameter
-    public static bool IsConfigurationLeftOver<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, TValue>> propertyExpression,
-        IReadOnlyList<IAvailablePlugin> availablePlugins,
-        ISpanParsable<TValue>? _ = null)
-        where TValue : struct, ISpanParsable<TValue>
-    {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
-
-        if (configMeta.LockedByConfigPluginId != Guid.Empty && configMeta.IsLocked)
-        {
-            var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-            if (plugin is null)
-            {
-                configMeta.ResetLockedConfiguration();
-                return true;
-            }
-        }
-
-        return CleanupEditableDefaultState(configMeta, SettingName(propertyExpression), availablePlugins);
-    }
-
-    // ReSharper restore MethodOverloadWithOptionalParameter
-
-    public static bool IsConfigurationLeftOver<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, IList<TValue>>> propertyExpression,
-        IEnumerable<IAvailablePlugin> availablePlugins)
-    {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
-
-        if (configMeta.ManagedMode is ManagedConfigurationMode.EDITABLE_DEFAULT)
-            return CleanupEditableDefaultState(configMeta, SettingName(propertyExpression), availablePlugins.ToList());
-
-        if (configMeta.LockedByConfigPluginId == Guid.Empty || !configMeta.IsLocked)
-            return false;
-
-        var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-        if (plugin is not null)
-            return false;
-
-        configMeta.ResetLockedConfiguration();
-        return true;
-    }
-
-    public static bool IsConfigurationLeftOver<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, ISet<TValue>>> propertyExpression,
-        IEnumerable<IAvailablePlugin> availablePlugins)
-    {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
-
-        if (configMeta.LockedByConfigPluginId == Guid.Empty || !configMeta.IsLocked)
-            return false;
-
-        var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-        if (plugin is null)
-        {
-            configMeta.ResetLockedConfiguration();
-            return true;
-        }
-
-        return false;
-    }
+    private static bool IsPluginAvailable(Guid configPluginId, IReadOnlyCollection<IAvailablePlugin> availablePlugins) => availablePlugins.Any(x => x.Id == configPluginId);
 
     /// <summary>
-    /// Checks if a plugin contribution is left over from a configuration plugin that is no longer available.
-    /// If so, it clears the contribution and returns true.
+    /// Removes persisted managed states which belong to settings that are not registered anymore.
     /// </summary>
-    public static bool IsPluginContributionLeftOver<TClass, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, ISet<TValue>>> propertyExpression,
-        IEnumerable<IAvailablePlugin> availablePlugins)
+    /// <remarks>
+    /// Without this, states of removed or renamed settings would stay in the settings file forever.
+    /// </remarks>
+    private static bool RemoveUnknownManagedStates(IReadOnlySet<string> registeredSettingNames)
     {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
+        var wasChanged = false;
+        var configurationData = SettingsManagerAccess.ConfigurationData;
 
-        if (!configMeta.HasPluginContribution || configMeta.PluginContributionByConfigPluginId == Guid.Empty)
-            return false;
-
-        var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.PluginContributionByConfigPluginId);
-        if (plugin is null)
+        foreach (var settingName in configurationData.ManagedLockedConfigurations.Keys.Where(x => !registeredSettingNames.Contains(x)).ToList())
         {
-            configMeta.ClearPluginContribution();
-            return true;
+            Log.LogInformation($"Removing the persisted lock of the setting '{settingName}': this setting does not exist anymore.");
+            configurationData.ManagedLockedConfigurations.Remove(settingName);
+            wasChanged = true;
         }
 
-        return false;
+        foreach (var settingName in configurationData.ManagedEditableDefaults.Keys.Where(x => !registeredSettingNames.Contains(x)).ToList())
+        {
+            Log.LogInformation($"Removing the persisted editable default of the setting '{settingName}': this setting does not exist anymore.");
+            configurationData.ManagedEditableDefaults.Remove(settingName);
+            wasChanged = true;
+        }
+
+        return wasChanged;
     }
 
-    public static bool IsConfigurationLeftOver<TClass>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, IDictionary<string, string>>> propertyExpression,
-        IEnumerable<IAvailablePlugin> availablePlugins)
-    {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
-
-        if (configMeta.LockedByConfigPluginId == Guid.Empty || !configMeta.IsLocked)
-            return false;
-
-        var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-        if (plugin is null)
-        {
-            configMeta.ResetLockedConfiguration();
-            return true;
-        }
-
-        return false;
-    }
-
-    public static bool IsConfigurationLeftOver<TClass, TKey, TValue>(
-        Expression<Func<Data, TClass>> configSelection,
-        Expression<Func<TClass, Dictionary<TKey, TValue>>> propertyExpression,
-        IEnumerable<IAvailablePlugin> availablePlugins)
-        where TKey : struct, Enum
-        where TValue : struct, Enum
-    {
-        if (!TryGet(configSelection, propertyExpression, out var configMeta))
-            return false;
-
-        if (configMeta.ManagedMode is ManagedConfigurationMode.EDITABLE_DEFAULT)
-        {
-            var plugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.EditableDefaultByConfigPluginId);
-            if (plugin is null)
-            {
-                configMeta.ClearEditableDefaultConfiguration();
-                ClearEditableDefaultState(SettingName(propertyExpression));
-                return true;
-            }
-
-            return false;
-        }
-
-        if (configMeta.LockedByConfigPluginId == Guid.Empty || !configMeta.IsLocked)
-            return false;
-
-        var lockedPlugin = availablePlugins.FirstOrDefault(x => x.Id == configMeta.LockedByConfigPluginId);
-        if (lockedPlugin is null)
-        {
-            configMeta.ResetLockedConfiguration();
-            return true;
-        }
-
-        return false;
-    }
-    
     private static string Path<TClass, TValue>(Expression<Func<Data, TClass>> configSelection, Expression<Func<TClass, TValue>> propertyExpression)
     {
         var className = typeof(TClass).Name;
@@ -514,12 +378,9 @@ public static partial class ManagedConfiguration
 
     private static bool ClearEditableDefaultState(string settingName) => SettingsManagerAccess.ConfigurationData.ManagedEditableDefaults.Remove(settingName);
 
-    private static bool CleanupEditableDefaultState<TClass, TValue>(
-        ConfigMeta<TClass, TValue> configMeta,
-        string settingName,
-        IReadOnlyList<IAvailablePlugin> availablePlugins)
+    private static bool CleanupEditableDefaultState(ConfigMetaBase configMeta, IReadOnlyCollection<IAvailablePlugin> availablePlugins)
     {
-        if (!TryGetEditableDefaultState(settingName, out var editableDefaultState))
+        if (!TryGetEditableDefaultState(configMeta.SettingName, out var editableDefaultState))
         {
             if (configMeta.ManagedMode is not ManagedConfigurationMode.EDITABLE_DEFAULT)
                 return false;
@@ -528,11 +389,11 @@ public static partial class ManagedConfiguration
             return true;
         }
 
-        var plugin = availablePlugins.FirstOrDefault(x => x.Id == editableDefaultState.ConfigPluginId);
-        if (plugin is not null)
+        if (IsPluginAvailable(editableDefaultState.ConfigPluginId, availablePlugins))
             return false;
 
+        Log.LogInformation($"Clearing the editable default of the setting '{configMeta.SettingName}': the configuration plugin '{editableDefaultState.ConfigPluginId}' is not available anymore.");
         configMeta.ClearEditableDefaultConfiguration();
-        return ClearEditableDefaultState(settingName);
+        return ClearEditableDefaultState(configMeta.SettingName);
     }
 }
\ No newline at end of file
diff --git a/app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.Loading.cs b/app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.Loading.cs
index c24ae75f..fc12ef11 100644
--- a/app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.Loading.cs	
+++ b/app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.Loading.cs	
@@ -199,185 +199,9 @@ public static partial class PluginFactory
         if (SettingsManagerAccess.ConfigurationData.MandatoryInformation.RemoveLeftOverAcceptances(GetMandatoryInfos()))
             wasConfigurationChanged = true;
         
-        // Check for a preselected provider:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.PreselectedProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for a preselected profile:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.PreselectedProfile, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for preselected chat options:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectOptions, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedProfile, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedChatTemplate, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedDataSourcesDisabled, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedDataSourcesAutomaticSelection, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedDataSourcesAutomaticValidation, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.PreselectedDataSourceIds, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Chat, x => x.SendToChatDataSourceBehavior, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for the update interval:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.UpdateInterval, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for the update installation method:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.UpdateInstallation, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the start page:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.StartPage, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the built-in introduction visibility:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShowIntroduction, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the quick start guide visibility:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShowQuickStartGuide, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the last changelog visibility:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShowLastChangelog, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the vision panel visibility:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShowVision, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for users allowed to added providers:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.AllowUserToAddProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the plugin import permission:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.AllowUserToImportPlugins, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the plugin sharing permission:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.AllowUserToSharePlugins, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for admin settings visibility:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShowAdminSettings, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for preview visibility:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.PreviewVisibility, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for enabled preview features:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.EnabledPreviewFeatures, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        if(ManagedConfiguration.IsPluginContributionLeftOver(x => x.App, x => x.EnabledPreviewFeatures, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for the transcription provider:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.UseTranscriptionProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for hidden assistants:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.HiddenAssistants, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check for the voice recording shortcut:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShortcutVoiceRecording, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for the external HTTP client timeout:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.HttpClientTimeoutSeconds, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check for custom root certificates for external HTTP requests:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ExternalHttpCustomRootCertificatesEnabled, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ExternalHttpCustomRootCertificateBundlePath, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ExternalHttpCustomRootCertificateAllowedHosts, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check provider confidence settings:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Confidence, x => x.EnforceGlobalMinimumConfidence, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Confidence, x => x.GlobalMinimumConfidence, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Confidence, x => x.ShowProviderConfidence, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Confidence, x => x.ConfidenceScheme, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.Confidence, x => x.CustomConfidenceScheme, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check data source security settings:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.DataSourceSecurity, x => x.TrustedProviderIds, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check data source selection agent settings:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AgentDataSourceSelection, x => x.PreselectAgentOptions, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AgentDataSourceSelection, x => x.PreselectedAgentProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check retrieval context validation agent settings:
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AgentRetrievalContextValidation, x => x.EnableRetrievalContextValidation, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AgentRetrievalContextValidation, x => x.PreselectAgentOptions, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AgentRetrievalContextValidation, x => x.PreselectedAgentProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AgentRetrievalContextValidation, x => x.NumParallelValidations, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check if audit is required before it can be activated
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AssistantPluginAudit, x => x.RequireAuditBeforeActivation, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Register new preselected provider for the security audit
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AssistantPluginAudit, x => x.PreselectedAgentProvider, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Change the minimum required audit level that is required for the allowance of assistants
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AssistantPluginAudit, x => x.MinimumLevel, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check if external plugins are strictly forbidden, when the minimum audit level is fell below
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AssistantPluginAudit, x => x.BlockActivationBelowMinimum, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-        
-        // Check if security audits are invoked automatically and transparent for the user
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AssistantPluginAudit, x => x.AutomaticallyAuditAssistants, AVAILABLE_PLUGINS))
-            wasConfigurationChanged = true;
-
-        // Check enterprise-managed assistant plugin approvals
-        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.AssistantPluginAudit, x => x.EnterpriseApprovedPlugins, AVAILABLE_PLUGINS))
+        // Check all managed settings, i.e. settings which a configuration plugin can lock,
+        // provide as an editable default, or contribute to:
+        if(ManagedConfiguration.CleanupLeftOverManagedConfigurations(AVAILABLE_PLUGINS))
             wasConfigurationChanged = true;
 
         // Compatibility shim, see documentation/compatibility-shims/2026-08-orphaned-config-locks.md (remove after 2027-08-06):