feat(proxy): add bulk assignment and proxy usage stats

- Implement bulk proxy assignment for accounts with flexible input (login:proxy, login:ID, or login)
- Add UI for mass assignment with counters and behavior selection for unspecified proxies
- Show assigned account count badges in proxy list for better visibility
- Enable quick assignment of a free proxy to an account
- Ensure fast and consistent proxy assignment state via in-memory cache
- Perform ReSharper cleanup

src/NebulaAuth/Converters/Converters.xaml

@@ -15,6 +15,7 @@
     <converters:BoolToMafileNamingConverter x:Key="BoolToMafileNamingConverter" />
     <converters:BoolToValueConverter x:Key="BoolToValueConverter" />
     <converters:NullableToBooleanConverter x:Key="NullableToBooleanConverter" />
+    <converters:ProxyAccountCountConverter x:Key="ProxyAccountCountConverter" />
     <!-- Background converters-->
     <background:BackgroundImageVisibleConverter x:Key="BackgroundImageVisibleConverter" />
     <background:BackgroundSourceConverter x:Key="BackgroundSourceConverter" />

src/NebulaAuth/Converters/ProxyAccountCountConverter.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using NebulaAuth.Model;
+
+namespace NebulaAuth.Converters;
+
+/// <summary>
+///     Converts a proxy ID (int) to the number of accounts assigned to it.
+///     Returns empty string when count is zero so the badge is invisible.
+/// </summary>
+public class ProxyAccountCountConverter : IValueConverter
+{
+    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is not int proxyId) return string.Empty;
+        var count = ProxyAssignmentCache.GetAccountCount(proxyId);
+        return count > 0 ? count.ToString() : string.Empty;
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

src/NebulaAuth/Localization/dialogs.proxymanager.loc.json

@@ -40,6 +40,26 @@
         "es": "El proxy tiene un formato incorrecto",
         "tr": "Proxy yanlış formatta",
         "kk": "Прокси қате форматта"
+      },
+      "AssignmentSuccess": {
+        "ru": "Прокси назначены: {0}",
+        "en": "Assigned: {0}",
+        "zh": "已分配：{0}",
+        "uk": "Проксі призначено: {0}",
+        "fr": "Attribués: {0}",
+        "es": "Asignados: {0}",
+        "tr": "Atandı: {0}",
+        "kk": "Тағайындалды: {0}"
+      },
+      "AssignmentPartialSuccess": {
+        "ru": "Назначено: {0}, не найдено: {1}, ошибки: {2}",
+        "en": "Assigned: {0}, not found: {1}, errors: {2}",
+        "zh": "已分配：{0}，未找到：{1}，错误：{2}",
+        "uk": "Призначено: {0}, не знайдено: {1}, помилки: {2}",
+        "fr": "Attribués: {0}, non trouvés: {1}, erreurs: {2}",
+        "es": "Asignados: {0}, no encontrados: {1}, errores: {2}",
+        "tr": "Atandı: {0}, bulunamadı: {1}, hatalar: {2}",
+        "kk": "Тағайындалды: {0}, табылмады: {1}, қателер: {2}"
       }
     }
   },
@@ -93,6 +113,96 @@
       "es": "Mostrar credenciales",
       "tr": "Kimlik bilgilerini göster",
       "kk": "Тіркелгі деректерін көрсету"
+    },
+    "TabManager": {
+      "en": "Manager",
+      "ru": "Менеджер",
+      "zh": "管理",
+      "uk": "Менеджер",
+      "fr": "Gestionnaire",
+      "es": "Administrador",
+      "tr": "Yönetici",
+      "kk": "Менеджер"
+    },
+    "TabAssignment": {
+      "en": "Assignment",
+      "ru": "Назначение",
+      "zh": "分配",
+      "uk": "Призначення",
+      "fr": "Attribution",
+      "es": "Asignación",
+      "tr": "Atama",
+      "kk": "Тағайындау"
+    },
+    "TotalAccounts": {
+      "en": "Accounts",
+      "ru": "Аккаунтов",
+      "zh": "账户",
+      "uk": "Акаунтів",
+      "fr": "Comptes",
+      "es": "Cuentas",
+      "tr": "Hesaplar",
+      "kk": "Аккаунттар"
+    },
+    "TotalProxies": {
+      "en": "Proxies",
+      "ru": "Прокси",
+      "zh": "代理",
+      "uk": "Проксі",
+      "fr": "Proxies",
+      "es": "Proxies",
+      "tr": "Proxy'ler",
+      "kk": "Проксилер"
+    },
+    "AssignedProxies": {
+      "en": "Assigned",
+      "ru": "Назначено",
+      "zh": "已分配",
+      "uk": "Призначено",
+      "fr": "Attribués",
+      "es": "Asignados",
+      "tr": "Atandı",
+      "kk": "Тағайындалды"
+    },
+    "UnspecifiedBehavior": {
+      "en": "Unspecified proxy:",
+      "ru": "Не указанный прокси:",
+      "zh": "未指定代理：",
+      "uk": "Не вказаний проксі:",
+      "fr": "Proxy non spécifié:",
+      "es": "Proxy no especificado:",
+      "tr": "Belirtilmemiş proxy:",
+      "kk": "Көрсетілмеген прокси:"
+    },
+    "UnspecifiedRandom": {
+      "en": "Assign random",
+      "ru": "Назначить случайный",
+      "zh": "随机分配",
+      "uk": "Призначити випадковий",
+      "fr": "Attribuer aléatoirement",
+      "es": "Asignar aleatorio",
+      "tr": "Rastgele ata",
+      "kk": "Кездейсоқ тағайындау"
+    },
+    "UnspecifiedRemove": {
+      "en": "Remove proxy",
+      "ru": "Удалить прокси",
+      "zh": "删除代理",
+      "uk": "Видалити проксі",
+      "fr": "Supprimer le proxy",
+      "es": "Eliminar proxy",
+      "tr": "Proxy'yi kaldır",
+      "kk": "Проксиді жою"
+    },
+    "ApplyAssignment": {
+      "en": "Apply",
+      "ru": "Применить",
+      "zh": "应用",
+      "uk": "Застосувати",
+      "fr": "Appliquer",
+      "es": "Aplicar",
+      "tr": "Uygula",
+      "kk": "Қолдану"
     }
   }
 }

src/NebulaAuth/Localization/mainwindow.loc.json

@@ -904,6 +904,16 @@
           "es": "Desvincular proxy",
           "tr": "Proxy bağlantısını kaldır",
           "kk": "Проксиді ажырату"
+        },
+        "AssignFreeProxy": {
+          "en": "Assign free proxy",
+          "ru": "Назначить свободный прокси",
+          "zh": "分配空闲代理",
+          "uk": "Призначити вільний проксі",
+          "fr": "Attribuer un proxy libre",
+          "es": "Asignar proxy libre",
+          "tr": "Serbest proxy ata",
+          "kk": "Бос проксиді тағайындау"
         }
       },
       "Proxy": {

src/NebulaAuth/MainWindow.xaml

@@ -420,6 +420,9 @@
                                             <MenuItem Header="{Tr MainWindow.ContextMenus.Mafile.UnattachProxy}"
                                                       Command="{Binding RemoveProxyCommand}"
                                                       CommandParameter="{Binding PlacementTarget.SelectedValue, RelativeSource={RelativeSource AncestorType=ContextMenu}}" />
+                                            <MenuItem Header="{Tr MainWindow.ContextMenus.Mafile.AssignFreeProxy}"
+                                                      Command="{Binding AssignFreeProxyCommand}"
+                                                      CommandParameter="{Binding PlacementTarget.SelectedValue, RelativeSource={RelativeSource AncestorType=ContextMenu}}" />
                                         </ContextMenu>
                                     </FrameworkElement.ContextMenu>
 

src/NebulaAuth/Model/ProxyAssignmentCache.cs

@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using AchiesUtilities.Collections;
+using AchiesUtilities.Web.Proxy;
+using NebulaAuth.Model.Entities;
+
+namespace NebulaAuth.Model;
+
+/// <summary>
+///     In-memory cache tracking which proxy IDs are currently assigned to accounts.
+///     Provides fast lookup for free proxy selection without iterating all mafiles.
+///     Initialized at startup and kept in sync whenever proxy assignments change.
+/// </summary>
+public static class ProxyAssignmentCache
+{
+    private static readonly Dictionary<int, HashSet<string>> _proxyToAccounts = new();
+
+    public static void Initialize(IEnumerable<Mafile> mafiles)
+    {
+        _proxyToAccounts.Clear();
+        foreach (var maf in mafiles)
+        {
+            if (maf.Proxy != null)
+                AddInternal(maf.Proxy.Id, maf.AccountName);
+        }
+    }
+
+    /// <summary>
+    ///     Call whenever a proxy assignment on a mafile changes and is persisted to disk.
+    /// </summary>
+    public static void UpdateAssignment(string? accountName, int? oldProxyId, int? newProxyId)
+    {
+        if (accountName == null) return;
+        if (oldProxyId.HasValue) RemoveInternal(oldProxyId.Value, accountName);
+        if (newProxyId.HasValue) AddInternal(newProxyId.Value, accountName);
+    }
+
+    public static bool IsProxyFree(int proxyId)
+    {
+        return !_proxyToAccounts.TryGetValue(proxyId, out var set) || set.Count == 0;
+    }
+
+    public static int GetAccountCount(int proxyId)
+    {
+        return _proxyToAccounts.TryGetValue(proxyId, out var set) ? set.Count : 0;
+    }
+
+    /// <summary>
+    ///     Returns a random free proxy (not the default proxy), or null if none available.
+    /// </summary>
+    public static KeyValuePair<int, ProxyData>? GetRandomFreeProxy(
+        ObservableDictionary<int, ProxyData> proxies,
+        int? excludeDefaultProxyId)
+    {
+        var free = proxies
+            .Where(kvp => kvp.Key != excludeDefaultProxyId && IsProxyFree(kvp.Key))
+            .ToList();
+        if (free.Count == 0) return null;
+        return free[Random.Shared.Next(free.Count)];
+    }
+
+    private static void AddInternal(int proxyId, string accountName)
+    {
+        if (!_proxyToAccounts.TryGetValue(proxyId, out var set))
+        {
+            set = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+            _proxyToAccounts[proxyId] = set;
+        }
+
+        set.Add(accountName);
+    }
+
+    private static void RemoveInternal(int proxyId, string accountName)
+    {
+        if (_proxyToAccounts.TryGetValue(proxyId, out var set))
+            set.Remove(accountName);
+    }
+}

src/NebulaAuth/Model/Shell.cs

@@ -45,6 +45,7 @@ public static class Shell
 
         var threads = Environment.ProcessorCount > 0 ? Environment.ProcessorCount : 1;
         await Storage.Initialize(threads);
+        ProxyAssignmentCache.Initialize(Storage.MaFiles);
         MAACStorage.Initialize();
         MafileExporterStorage.Initialize();
 

src/NebulaAuth/Theme/Brushes.xaml

@@ -89,4 +89,7 @@
                      Color="{StaticResource SecondaryColor}" />
     <SolidColorBrush x:Key="MaterialDesign.Brush.Secondary.Dark.Foreground"
                      Color="{StaticResource BaseContentColor}" />
+
+    <SolidColorBrush x:Key="MaterialDesign.Brush.RadioButton.Outline"
+                     Color="{StaticResource BaseContentColor}" />
 </ResourceDictionary>

src/NebulaAuth/View/ProxyManagerView.xaml

@@ -20,12 +20,12 @@
              FontSize="16">
     <Grid>
         <Grid.RowDefinitions>
-            <RowDefinition Height="Auto" />
             <RowDefinition Height="Auto" />
             <RowDefinition Height="Auto" />
             <RowDefinition Height="*" />
-            <RowDefinition Height="Auto" />
         </Grid.RowDefinitions>
+
+        <!-- Title -->
         <Grid Margin="10,10,10,5">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="*" />
@@ -45,7 +45,23 @@
             </Button>
         </Grid>
         <Separator Grid.Row="1" />
-        <Grid Grid.Row="2">
+
+        <!-- Tabs -->
+        <TabControl Grid.Row="2"
+                    md:ColorZoneAssist.Background="{DynamicResource Base100Brush}"
+                    Style="{StaticResource MaterialDesignUniformTabControl}">
+
+            <!-- Tab 1: Proxy Manager -->
+            <TabItem Header="{Tr ProxyManagerDialog.TabManager}">
+                <Grid>
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="*" />
+                        <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+
+                    <!-- Default proxy + display options -->
+                    <Grid Grid.Row="0">
                         <Grid.RowDefinitions>
                             <RowDefinition />
                             <RowDefinition />
@@ -57,7 +73,8 @@
                             </Grid.ColumnDefinitions>
                             <TextBlock HorizontalAlignment="Stretch">
                                 <Run Text="{Tr ProxyManagerDialog.DefaultProxy, IsDynamic=False}" />
-                    <Run Text="{Binding DefaultProxy.Key, StringFormat='&#x0a;0:', FallbackValue='-', Mode=OneWay}" />
+                                <Run
+                                    Text="{Binding DefaultProxy.Key, StringFormat='&#x0a;0:', FallbackValue='-', Mode=OneWay}" />
                                 <Run>
                                     <Run.Text>
                                         <MultiBinding Mode="OneWay"
@@ -71,19 +88,20 @@
                                     </Run.Text>
                                 </Run>
                             </TextBlock>
-
                             <Button Grid.Column="1" Command="{Binding RemoveDefaultCommand}">
                                 <md:PackIcon Kind="ClearBox" Width="20" Height="20" />
                             </Button>
-
                         </Grid>
                         <StackPanel Grid.Row="1" Margin="15,0,15,15">
-                <CheckBox Content="{Tr ProxyManagerDialog.DisplayProxyProtocol}" IsChecked="{Binding DisplayProtocol}" />
+                            <CheckBox Content="{Tr ProxyManagerDialog.DisplayProxyProtocol}"
+                                      IsChecked="{Binding DisplayProtocol}" />
                             <CheckBox Content="{Tr ProxyManagerDialog.DisplayProxyCredentials}"
                                       IsChecked="{Binding DisplayCredentials}" />
                         </StackPanel>
                     </Grid>
-        <md:Card Grid.Row="3" Margin="10">
+
+                    <!-- Proxy list -->
+                    <md:Card Grid.Row="1" Margin="10">
                         <ListBox VirtualizingStackPanel.VirtualizationMode="Recycling" FontSize="14"
                                  SelectedValue="{Binding SelectedProxy}" ItemsSource="{Binding Proxies}">
                             <ListBox.InputBindings>
@@ -110,17 +128,15 @@
                                         </Setter.Value>
                                     </Setter>
                                     <Setter Property="HorizontalContentAlignment" Value="Stretch" />
-
-
                                 </Style>
                             </ListBox.ItemContainerStyle>
-
                             <ListBox.ItemTemplate>
                                 <DataTemplate>
                                     <Grid>
                                         <Grid.ColumnDefinitions>
                                             <ColumnDefinition Width="*" />
                                             <ColumnDefinition Width="Auto" />
+                                            <ColumnDefinition Width="Auto" />
                                         </Grid.ColumnDefinitions>
                                         <TextBlock VerticalAlignment="Center">
                                             <Run Text="{Binding Key, Mode=OneWay}" /><Run Text=": " />
@@ -136,23 +152,28 @@
                                                     </MultiBinding>
                                                 </Run.Text>
                                             </Run>
-
                                         </TextBlock>
-                            <Button Style="{StaticResource MaterialDesignIconButton}" Padding="0" Width="24"
+
-                                    Height="24" md:RippleAssist.IsDisabled="True" Grid.Column="1"
+                                        <TextBlock Grid.Column="1" VerticalAlignment="Center" FontSize="10" Margin="0,0,2,0"
+                                                   Foreground="{DynamicResource MaterialDesign.Brush.ForegroundLight}"
+                                                   Text="{Binding Key, Converter={StaticResource ProxyAccountCountConverter}}" />
+                                        <Button Style="{StaticResource MaterialDesignIconButton}" Padding="0"
+                                                Width="24"
+                                                Height="24" md:RippleAssist.IsDisabled="True" Grid.Column="2"
                                                 HorizontalAlignment="Right"
+                                                VerticalAlignment="Center" 
                                                 Command="{Binding DataContext.SetDefaultCommand, RelativeSource={RelativeSource AncestorType=UserControl}}"
                                                 CommandParameter="{Binding}">
                                                 <md:PackIcon Height="16" Width="16" Kind="Heart" />
                                         </Button>
-
                                     </Grid>
-
                                 </DataTemplate>
                             </ListBox.ItemTemplate>
                         </ListBox>
                     </md:Card>
-        <Grid Grid.Row="4" Margin="5,0,15,0">
+
+                    <!-- Add / Remove area -->
+                    <Grid Grid.Row="2" Margin="5,0,15,0">
                         <Grid.RowDefinitions>
                             <RowDefinition />
                             <RowDefinition />
@@ -166,14 +187,12 @@
                             Text="{Binding ErrorText}"
                             CloseCommand="{Binding ClearErrorCommand}"
                             ShowCloseButton="True" />
-
                         <Grid Grid.Row="1">
                             <Grid.ColumnDefinitions>
                                 <ColumnDefinition Width="*" />
                                 <ColumnDefinition Width="Auto" />
                                 <ColumnDefinition Width="Auto" />
                             </Grid.ColumnDefinitions>
-
                             <TextBox Text="{Binding AddProxyField}"
                                      KeyDown="ProxyInput_KeyDown"
                                      FontSize="12"
@@ -185,17 +204,110 @@
                                      md:HintAssist.IsFloating="False"
                                      md:HintAssist.Hint="IP:PORT&#x0a;IP:PORT:USER:PASS&#x0a;PROTOCOL://IP:PORT:USER:PASS&#x0a;IP:PORT:USER:PASS{ID}
                      " />
-                <Button x:Name="AddProxyBtn" ToolTip="CTRL+ENTER" IsDefault="True" Grid.Column="1" Height="90"
+                            <Button x:Name="AddProxyBtn" ToolTip="CTRL+ENTER" IsDefault="True" Grid.Column="1"
-                        Command="{Binding AddProxyCommand}">
+                                    Height="90" Command="{Binding AddProxyCommand}">
                                 <md:PackIcon Kind="Add" />
                             </Button>
-                <Button Grid.Column="2" Height="90" Command="{Binding RemoveProxyCommand}" CommandParameter="{x:Null}">
+                            <Button Grid.Column="2" Height="90" Command="{Binding RemoveProxyCommand}"
+                                    CommandParameter="{x:Null}">
                                 <md:PackIcon Kind="Trash" />
                             </Button>
                         </Grid>
+                    </Grid>
+                </Grid>
+            </TabItem>
+
+            <!-- Tab 2: Bulk Assignment -->
+            <TabItem Header="{Tr ProxyManagerDialog.TabAssignment}">
+                <Grid Margin="12">
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="*" />
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+
+                    <!-- Stats counters -->
+                    <UniformGrid Grid.Row="0" Columns="3" Margin="0,8,0,12">
+                        <Border Margin="0,0,4,0" Padding="10,8" CornerRadius="8"
+                                Background="{DynamicResource MaterialDesign.Brush.Card.Background}">
+                            <StackPanel HorizontalAlignment="Center">
+                                <TextBlock FontSize="20" FontWeight="Bold" HorizontalAlignment="Center"
+                                           Text="{Binding TotalAccounts, Mode=OneWay}" />
+                                <TextBlock FontSize="11" HorizontalAlignment="Center"
+                                           Text="{Tr ProxyManagerDialog.TotalAccounts}"
+                                           Foreground="{DynamicResource MaterialDesign.Brush.ForegroundLight}" />
+                            </StackPanel>
+                        </Border>
+                        <Border Margin="4,0,4,0" Padding="10,8" CornerRadius="8"
+                                Background="{DynamicResource MaterialDesign.Brush.Card.Background}">
+                            <StackPanel HorizontalAlignment="Center">
+                                <TextBlock FontSize="20" FontWeight="Bold" HorizontalAlignment="Center"
+                                           Text="{Binding TotalProxies, Mode=OneWay}" />
+                                <TextBlock FontSize="11" HorizontalAlignment="Center"
+                                           Text="{Tr ProxyManagerDialog.TotalProxies}"
+                                           Foreground="{DynamicResource MaterialDesign.Brush.ForegroundLight}" />
+                            </StackPanel>
+                        </Border>
+                        <Border Margin="4,0,0,0" Padding="10,8" CornerRadius="8"
+                                Background="{DynamicResource MaterialDesign.Brush.Card.Background}">
+                            <StackPanel HorizontalAlignment="Center">
+                                <TextBlock FontSize="20" FontWeight="Bold" HorizontalAlignment="Center"
+                                           Text="{Binding AssignedProxies, Mode=OneWay}" />
+                                <TextBlock FontSize="11" HorizontalAlignment="Center"
+                                           Text="{Tr ProxyManagerDialog.AssignedProxies}"
+                                           Foreground="{DynamicResource MaterialDesign.Brush.ForegroundLight}" />
+                            </StackPanel>
+                        </Border>
+                    </UniformGrid>
+
+                    <!-- Toggle: behaviour for unspecified proxy -->
+                    <StackPanel Grid.Row="1" Margin="0,0,0,10">
+                        <TextBlock Text="{Tr ProxyManagerDialog.UnspecifiedBehavior}" FontSize="13"
+                                   Margin="0,0,0,4"
+                                   Foreground="{DynamicResource MaterialDesign.Brush.ForegroundLight}" />
+                        <StackPanel Orientation="Horizontal">
+                            <RadioButton Content="{Tr ProxyManagerDialog.UnspecifiedRandom}"
+                                         IsChecked="{Binding UnspecifiedAssignRandom}"
+                                         Margin="0,0,24,0" />
+                            <RadioButton Content="{Tr ProxyManagerDialog.UnspecifiedRemove}"
+                                         IsChecked="{Binding UnspecifiedAssignRandom, Converter={StaticResource ReverseBooleanConverter}}" />
+                        </StackPanel>
+                    </StackPanel>
+
+                    <!-- Input -->
+                    <TextBox Grid.Row="2"
+                             Text="{Binding AssignmentInput, UpdateSourceTrigger=PropertyChanged}"
+                             FontSize="12"
+                             md:TextFieldAssist.HasClearButton="True"
+                             AcceptsReturn="True"
+                             Style="{StaticResource MaterialDesignOutlinedTextBox}"
+                             VerticalScrollBarVisibility="Auto"
+                             md:HintAssist.IsFloating="False"
+                             VerticalContentAlignment="Top"
+                             Cursor="IBeam"
+
+                             md:HintAssist.Hint="login:IP:PORT&#x0a;login:IP:PORT:USER:PASS&#x0a;login:socks5://USER:PASS@IP:PORT&#x0a;login:ID&#x0a;login" />
+
+                    <!-- Result HintBox -->
+                    <nebulaAuth:HintBox Grid.Row="3"
+                                        Visibility="{Binding AssignmentTip, Converter={StaticResource NullableToVisibilityConverter}}"
+                                        Margin="0,8,0,0"
+                                        Severity="Info"
+                                        FontSize="14"
+                                        Text="{Binding AssignmentTip}"
+                                        CloseCommand="{Binding ClearAssignmentTipCommand}"
+                                        ShowCloseButton="True" />
+
+                    <!-- Apply button -->
+                    <Button Grid.Row="4" Margin="0,10,0,0" HorizontalAlignment="Right"
+                            Command="{Binding ApplyAssignmentCommand}"
+                            Content="{Tr ProxyManagerDialog.ApplyAssignment}" />
+
 
                 </Grid>
-
+            </TabItem>
-
+        </TabControl>
     </Grid>
 </UserControl>

src/NebulaAuth/ViewModel/MainVM.cs

@@ -42,7 +42,7 @@ public partial class MainVM : ObservableObject
             new MaProxy(kvp.Key, kvp.Value)));
         Storage.MaFiles.CollectionChanged += MaFilesOnCollectionChanged;
         QueryGroups();
-        UpdateManager.CheckForUpdates(false);
+        UpdateManager.CheckForUpdates();
     }
 
     [RelayCommand]

src/NebulaAuth/ViewModel/MainVM_File.cs

@@ -25,6 +25,11 @@ namespace NebulaAuth.ViewModel;
 
 public partial class MainVM //File //TODO: Refactor
 {
+    private record MafileReadResult(
+        Mafile? Mafile,
+        bool SdaPasswordPrompted,
+        SDAEncryptionHelper.Context? SdaContext);
+
     public Settings Settings => Settings.Instance;
 
 
@@ -347,9 +352,4 @@ public partial class MainVM //File //TODO: Refactor
         if (mafile is not Mafile maf) return false;
         return maf.Password != null && PHandler.IsPasswordSet;
     }
-
-    private record MafileReadResult(
-        Mafile? Mafile,
-        bool SdaPasswordPrompted,
-        SDAEncryptionHelper.Context? SdaContext);
 }

src/NebulaAuth/ViewModel/MainVM_Proxy.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.Linq;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
@@ -38,9 +39,10 @@ public partial class MainVM
         }
 
         if (!system && SelectedMafile != null)
-
         {
+            var oldProxyId = SelectedMafile.Proxy?.Id;
             SelectedMafile.Proxy = SelectedProxy;
+            ProxyAssignmentCache.UpdateAssignment(SelectedMafile.AccountName, oldProxyId, SelectedProxy?.Id);
             Storage.UpdateMafile(SelectedMafile);
         }
 
@@ -74,7 +76,9 @@ public partial class MainVM
     {
         mafile ??= SelectedMafile;
         if (mafile?.Proxy == null) return;
+        var oldProxyId = mafile.Proxy.Id;
         mafile.Proxy = null;
+        ProxyAssignmentCache.UpdateAssignment(mafile.AccountName, oldProxyId, null);
         if (mafile == SelectedMafile)
             SetProxy(null, false); //Not system, triggered by user
     }
@@ -85,6 +89,38 @@ public partial class MainVM
         return mafile is {Proxy: not null};
     }
 
+    [RelayCommand(CanExecute = nameof(AssignFreeProxyCanExecute))]
+    private void AssignFreeProxy(Mafile? mafile)
+    {
+        mafile ??= SelectedMafile;
+        if (mafile == null) return;
+
+        int? defaultProxyId = null;
+        if (MaClient.DefaultProxy != null)
+        {
+            var defKvp = ProxyStorage.Proxies.FirstOrDefault(kvp => kvp.Value.Equals(MaClient.DefaultProxy));
+            if (defKvp.Value != null)
+                defaultProxyId = defKvp.Key;
+        }
+
+        var freeProxy = ProxyAssignmentCache.GetRandomFreeProxy(ProxyStorage.Proxies, defaultProxyId);
+        if (freeProxy == null) return;
+
+        var newProxy = new MaProxy(freeProxy.Value.Key, freeProxy.Value.Value);
+        var oldProxyId = mafile.Proxy?.Id;
+        mafile.Proxy = newProxy;
+        ProxyAssignmentCache.UpdateAssignment(mafile.AccountName, oldProxyId, newProxy.Id);
+        Storage.UpdateMafile(mafile);
+
+        if (mafile == SelectedMafile)
+            SetProxy(newProxy, true); // system=true: update UI only, assignment already saved
+    }
+
+    private bool AssignFreeProxyCanExecute(Mafile? mafile)
+    {
+        return ProxyStorage.Proxies.Count > 0;
+    }
+
     private void CheckProxyExist()
     {
         if (SelectedProxy == null)

src/NebulaAuth/ViewModel/Other/ProxyManagerVM.Assignment.cs

@@ -0,0 +1,187 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using AchiesUtilities.Web.Proxy;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using NebulaAuth.Model;
+using NebulaAuth.Model.Entities;
+using NebulaAuth.Model.Mafiles;
+using SteamLibForked.Models.SteamIds;
+
+namespace NebulaAuth.ViewModel.Other;
+
+public partial class ProxyManagerVM
+{
+    public int TotalAccounts => Storage.MaFiles.Count;
+    public int TotalProxies => ProxyStorage.Proxies.Count;
+    public int AssignedProxies => Storage.MaFiles.Count(m => m.Proxy != null);
+
+    [ObservableProperty] private string? _assignmentInput;
+    [ObservableProperty] private string? _assignmentTip;
+
+    /// <summary>
+    ///     true = assign a random free proxy to unspecified accounts; false = remove proxy from unspecified accounts.
+    /// </summary>
+    [ObservableProperty] private bool _unspecifiedAssignRandom = true;
+
+    public void RefreshAssignmentCounters()
+    {
+        OnPropertyChanged(nameof(TotalAccounts));
+        OnPropertyChanged(nameof(TotalProxies));
+        OnPropertyChanged(nameof(AssignedProxies));
+    }
+
+    [RelayCommand]
+    private async Task ApplyAssignment()
+    {
+        AssignmentTip = null;
+        var input = AssignmentInput;
+        if (string.IsNullOrWhiteSpace(input)) return;
+
+        var lines = input.Split(["\r\n", "\n"], StringSplitOptions.RemoveEmptyEntries);
+        var mafs = Storage.MaFiles.ToList();
+        var defaultProxyId = GetDefaultProxyId();
+
+        var success = 0;
+        var errors = 0;
+        var notFound = 0;
+
+        foreach (var rawLine in lines)
+        {
+            var line = rawLine.Trim();
+            if (string.IsNullOrWhiteSpace(line)) continue;
+
+            try
+            {
+                string login;
+                // resolvedProxy: null means unspecified (apply toggle behaviour)
+                MaProxy? resolvedProxy;
+
+                var colonIdx = line.IndexOf(':');
+                if (colonIdx >= 0)
+                {
+                    login = line[..colonIdx].Trim();
+                    var proxyPart = line[(colonIdx + 1)..].Trim();
+
+                    if (string.IsNullOrEmpty(proxyPart))
+                    {
+                        resolvedProxy = null; // unspecified
+                    }
+                    else if (int.TryParse(proxyPart, out var parsedId))
+                    {
+                        // Mode: login:ID — proxy ID
+                        if (!ProxyStorage.Proxies.TryGetValue(parsedId, out var byId))
+                        {
+                            errors++;
+                            continue;
+                        }
+
+                        resolvedProxy = new MaProxy(parsedId, byId);
+                    }
+                    else if (ProxyStorage.DefaultScheme.TryParse(proxyPart, out var parsedProxy))
+                    {
+                        // Mode: login:proxy_string — find existing or add
+                        resolvedProxy = FindOrAddProxy(parsedProxy);
+                    }
+                    else
+                    {
+                        errors++;
+                        continue;
+                    }
+                }
+                else
+                {
+                    login = line;
+                    resolvedProxy = null; // unspecified
+                }
+
+                if (string.IsNullOrWhiteSpace(login))
+                {
+                    errors++;
+                    continue;
+                }
+
+                var maf = FindMafile(mafs, login);
+                if (maf == null)
+                {
+                    notFound++;
+                    continue;
+                }
+
+                var newProxy = resolvedProxy ?? (UnspecifiedAssignRandom
+                    ? BuildRandomFreeProxy(defaultProxyId)
+                    : null);
+
+                var oldProxyId = maf.Proxy?.Id;
+                maf.Proxy = newProxy;
+                ProxyAssignmentCache.UpdateAssignment(maf.AccountName, oldProxyId, newProxy?.Id);
+                await Storage.UpdateMafileAsync(maf);
+                success++;
+            }
+            catch
+            {
+                errors++;
+            }
+        }
+
+        AnyChanges = true;
+        RefreshAssignmentCounters();
+        AssignmentTip = BuildAssignmentTip(success, notFound, errors);
+    }
+
+    [RelayCommand]
+    private void ClearAssignmentTip()
+    {
+        AssignmentTip = null;
+    }
+
+    /// <summary>
+    ///     Finds a proxy equal to <paramref name="proxyData" /> in storage.
+    ///     If not found, adds it and returns the new entry.
+    /// </summary>
+    private static MaProxy FindOrAddProxy(ProxyData proxyData)
+    {
+        var existing = ProxyStorage.Proxies.FirstOrDefault(kvp => kvp.Value.Equals(proxyData));
+        if (existing.Value != null)
+            return new MaProxy(existing.Key, existing.Value);
+
+        ProxyStorage.SetProxy(null, proxyData);
+
+        // Fetch the entry we just added (SetProxy guarantees it was stored)
+        var added = ProxyStorage.Proxies.First(kvp => kvp.Value.Equals(proxyData));
+        return new MaProxy(added.Key, added.Value);
+    }
+
+    private static MaProxy? BuildRandomFreeProxy(int? defaultProxyId)
+    {
+        var free = ProxyAssignmentCache.GetRandomFreeProxy(ProxyStorage.Proxies, defaultProxyId);
+        return free.HasValue ? new MaProxy(free.Value.Key, free.Value.Value) : null;
+    }
+
+    private static int? GetDefaultProxyId()
+    {
+        if (MaClient.DefaultProxy == null) return null;
+        var defKvp = ProxyStorage.Proxies.FirstOrDefault(kvp => kvp.Value.Equals(MaClient.DefaultProxy));
+        return defKvp.Value != null ? defKvp.Key : null;
+    }
+
+    private static Mafile? FindMafile(List<Mafile> mafs, string login)
+    {
+        SteamId64? steamId = null;
+        if (SteamId64.TryParse(login, out var id64))
+            steamId = id64;
+        if (steamId != null)
+            return mafs.FirstOrDefault(m => m.SteamId == steamId || m.AccountName == login);
+        return mafs.FirstOrDefault(m =>
+            string.Equals(m.AccountName, login, StringComparison.OrdinalIgnoreCase));
+    }
+
+    private static string BuildAssignmentTip(int success, int notFound, int errors)
+    {
+        if (success > 0 && errors == 0 && notFound == 0)
+            return string.Format(GetLocalizationOrDefault("AssignmentSuccess"), success);
+        return string.Format(GetLocalizationOrDefault("AssignmentPartialSuccess"), success, notFound, errors);
+    }
+}

src/SteamLibForked/Core/SteamDomains.cs

@@ -1,5 +1,5 @@
-using SteamLibForked.Models.Core;
+using System.Collections.Immutable;
-using System.Collections.Immutable;
+using SteamLibForked.Models.Core;
 
 namespace SteamLib.Core;
 

src/SteamLibForked/Models/Core/Session/MobileSessionData.cs

@@ -1,8 +1,8 @@
-using Newtonsoft.Json;
+using System.Diagnostics.CodeAnalysis;
+using Newtonsoft.Json;
 using SteamLib.Core;
 using SteamLibForked.Abstractions;
 using SteamLibForked.Models.Core;
-using System.Diagnostics.CodeAnalysis;
 
 namespace SteamLibForked.Models.Session;
 
@@ -42,6 +42,7 @@ public class MobileSessionData : SessionData, IMobileSessionData
             // See: SteamAuthToken 'TODO' for more details
             return MobileToken ?? base.GetToken(domain);
         }
+
         return base.GetToken(domain);
     }
 
@@ -52,7 +53,7 @@ public class MobileSessionData : SessionData, IMobileSessionData
         if (token.Type != SteamAccessTokenType.Mobile)
             throw new ArgumentException("Token must be of type MobileAccess", nameof(token))
             {
-                Data = { { "ActualType", token.Type } }
+                Data = {{"ActualType", token.Type}}
             };
 
         MobileToken = token;
@@ -65,6 +66,6 @@ public class MobileSessionData : SessionData, IMobileSessionData
 
     public override MobileSessionData Clone()
     {
-        return (MobileSessionData)((ISessionData)this).Clone();
+        return (MobileSessionData) ((ISessionData) this).Clone();
     }
 }

src/SteamLibForked/Utility/MafileSerialization/LegacyMafile.cs

@@ -4,14 +4,11 @@ namespace SteamLib.Utility.MafileSerialization;
 
 internal class LegacyMafile
 {
-    [JsonProperty("shared_secret")]
+    [JsonProperty("shared_secret")] public string SharedSecret { get; set; } = null!;
-    public string SharedSecret { get; set; } = null!;
 
-    [JsonProperty("identity_secret")]
+    [JsonProperty("identity_secret")] public string IdentitySecret { get; set; } = null!;
-    public string IdentitySecret { get; set; } = null!;
 
-    [JsonProperty("device_id")]
+    [JsonProperty("device_id")] public string DeviceId { get; set; } = null!;
-    public string DeviceId { get; set; } = null!;
 
     [JsonProperty("revocation_code")] public string RevocationCode { get; set; } = null!;
     [JsonProperty("account_name")] public string AccountName { get; set; } = null!;