Release v33.1 (app)

Closes #161

app/.idea/.idea.DiscordHistoryTracker/.idea/.gitignore

@@ -2,7 +2,6 @@
 /contentModel.xml
 /dataSources
 /dataSources.local.xml
-/dataSources.xml
 /dictionaries
 /httpRequests/
 /misc.xml

app/.idea/.idea.DiscordHistoryTracker/.idea/avalonia.xml

@@ -4,8 +4,11 @@
     <option name="projectPerEditor">
       <map>
         <entry key="Desktop/App.axaml" value="Desktop/Desktop.csproj" />
+        <entry key="Desktop/Dialogs/CheckBoxDialog.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Dialogs/MessageDialog.axaml" value="Desktop/Desktop.csproj" />
+        <entry key="Desktop/Dialogs/ProgressDialog.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/AboutWindow.axaml" value="Desktop/Desktop.csproj" />
+        <entry key="Desktop/Main/Controls/FilterPanel.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/Controls/StatusBar.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/MainContentScreen.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/MainWindow.axaml" value="Desktop/Desktop.csproj" />

app/.idea/.idea.DiscordHistoryTracker/.idea/codeStyles/Project.xml

@@ -13,10 +13,10 @@
     <CssCodeStyleSettings>
       <option name="HEX_COLOR_LOWER_CASE" value="true" />
     </CssCodeStyleSettings>
-    <DB2CodeStyleSettings version="5">
+    <DB2CodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </DB2CodeStyleSettings>
-    <DerbyCodeStyleSettings version="5">
+    <DerbyCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </DerbyCodeStyleSettings>
     <GoCodeStyleSettings>
@@ -26,10 +26,13 @@
       <option name="WRAP_FUNC_PARAMS" value="5" />
       <option name="WRAP_FUNC_RESULT" value="5" />
     </GoCodeStyleSettings>
-    <H2CodeStyleSettings version="5">
+    <H2CodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </H2CodeStyleSettings>
-    <HSQLCodeStyleSettings version="5">
+    <H2CodeStyleSettings version="6">
+      <option name="USE_GENERIC_STYLE" value="true" />
+    </H2CodeStyleSettings>
+    <HSQLCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </HSQLCodeStyleSettings>
     <HTMLCodeStyleSettings>
@@ -85,10 +88,10 @@
     <LessCodeStyleSettings>
       <option name="HEX_COLOR_LOWER_CASE" value="true" />
     </LessCodeStyleSettings>
-    <MSSQLCodeStyleSettings version="5">
+    <MSSQLCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </MSSQLCodeStyleSettings>
-    <MySQLCodeStyleSettings version="5">
+    <MySQLCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </MySQLCodeStyleSettings>
     <Objective-C>
@@ -98,7 +101,7 @@
       <option name="SPACE_BEFORE_INIT_LIST" value="true" />
       <option name="SPACE_AFTER_DICTIONARY_LITERAL_COLON" value="false" />
     </Objective-C>
-    <OracleCodeStyleSettings version="5">
+    <OracleCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </OracleCodeStyleSettings>
     <PHPCodeStyleSettings>
@@ -116,7 +119,7 @@
       <option name="NEW_LINE_AFTER_PHP_OPENING_TAG" value="true" />
       <option name="SPACE_AROUND_ASSIGNMENT_IN_DECLARE" value="true" />
     </PHPCodeStyleSettings>
-    <PostgresCodeStyleSettings version="5">
+    <PostgresCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </PostgresCodeStyleSettings>
     <Properties>
@@ -143,13 +146,13 @@
       <option name="INDENT_WHEN_CASES" value="true" />
       <option name="CHAIN_CALLS_ALIGNMENT" value="2" />
     </Ruby>
-    <SQLiteCodeStyleSettings version="5">
+    <SQLiteCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </SQLiteCodeStyleSettings>
     <ScssCodeStyleSettings>
       <option name="HEX_COLOR_LOWER_CASE" value="true" />
     </ScssCodeStyleSettings>
-    <SqlCodeStyleSettings version="5">
+    <SqlCodeStyleSettings version="6">
       <option name="KEYWORD_CASE" value="2" />
       <option name="TYPE_CASE" value="2" />
       <option name="CUSTOM_TYPE_CASE" value="2" />
@@ -175,7 +178,7 @@
       <option name="VIEW_INDENT_QUERY" value="true" />
       <option name="EXPR_CASE_WHEN_WRAP" value="false" />
     </SqlCodeStyleSettings>
-    <SybaseCodeStyleSettings version="5">
+    <SybaseCodeStyleSettings version="6">
       <option name="USE_GENERIC_STYLE" value="true" />
     </SybaseCodeStyleSettings>
     <TypeScriptCodeStyleSettings version="0">

app/.idea/.idea.DiscordHistoryTracker/.idea/dataSources.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="empty.dht" read-only="true" uuid="e01b8deb-489e-470a-9011-f6548927191e">
+      <driver-ref>sqlite.xerial</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.sqlite.JDBC</jdbc-driver>
+      <jdbc-url>jdbc:sqlite:$PROJECT_DIR$/empty.dht</jdbc-url>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

app/.idea/.idea.DiscordHistoryTracker/.idea/runConfigurations/Desktop.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="Desktop" type="DotNetProject" factoryName=".NET Project">
-    <option name="EXE_PATH" value="$PROJECT_DIR$/Desktop/bin/Debug/net5.0/Desktop.exe" />
+    <option name="EXE_PATH" value="$PROJECT_DIR$/Desktop/bin/Debug/net5.0/DiscordHistoryTracker.exe" />
     <option name="PROGRAM_PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/Desktop/bin/Debug/net5.0" />
     <option name="PASS_PARENT_ENVS" value="1" />

app/Desktop/App.axaml

@@ -1,5 +1,6 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:common="clr-namespace:DHT.Desktop.Common"
              x:Class="DHT.Desktop.App">
 
     <Application.Styles>
@@ -8,20 +9,20 @@
 
         <Style Selector="Button">
             <Setter Property="Padding" Value="10 7 10 6" />
-            <Setter Property="Background" Value="#D2D2D2" />
+            <Setter Property="Background" Value="#DDDDDD" />
             <Setter Property="BorderBrush" Value="#999999" />
             <Setter Property="BorderThickness" Value="1" />
+            <Setter Property="CornerRadius" Value="0" />
             <Setter Property="HorizontalContentAlignment" Value="Center" />
             <Setter Property="VerticalContentAlignment" Value="Center" />
         </Style>
         <Style Selector="Button /template/ ContentPresenter#PART_ContentPresenter">
-            <Setter Property="TextBlock.Foreground" Value="#070707" />
+            <Setter Property="TextBlock.Foreground" Value="#060606" />
-            <Setter Property="Background" Value="#D2D2D2" />
+            <Setter Property="Background" Value="#DDDDDD" />
             <Setter Property="BorderBrush" Value="#999999" />
-            <Setter Property="CornerRadius" Value="0" />
         </Style>
         <Style Selector="Button:pointerover /template/ ContentPresenter#PART_ContentPresenter">
-            <Setter Property="Background" Value="#DEDEDE" />
+            <Setter Property="Background" Value="#E7E7E7" />
             <Setter Property="BorderBrush" Value="#A2A2A2" />
             <Setter Property="CornerRadius" Value="0" />
         </Style>
@@ -29,28 +30,25 @@
             <Setter Property="RenderTransform" Value="none" />
         </Style>
         <Style Selector="Button:pressed /template/ ContentPresenter#PART_ContentPresenter">
-            <Setter Property="Background" Value="#E5E5E5" />
+            <Setter Property="Background" Value="#EBEBEB" />
             <Setter Property="BorderBrush" Value="#A5A5A5" />
             <Setter Property="CornerRadius" Value="0" />
         </Style>
         <Style Selector="Button:disabled /template/ ContentPresenter#PART_ContentPresenter">
-            <Setter Property="TextBlock.Foreground" Value="#909090" />
+            <Setter Property="TextBlock.Foreground" Value="#7A7A7A" />
             <Setter Property="Background" Value="#E9E9E9" />
             <Setter Property="BorderBrush" Value="#BFBFBF" />
-            <Setter Property="CornerRadius" Value="0" />
         </Style>
 
         <Style Selector="TextBox">
             <Setter Property="BorderBrush" Value="#999999" />
             <Setter Property="BorderThickness" Value="1" />
+            <Setter Property="CornerRadius" Value="0" />
             <Setter Property="SelectionBrush" Value="#72C0FF" />
             <Setter Property="Background" Value="#F4F4F4" />
             <Setter Property="Padding" Value="6 0" />
             <Setter Property="VerticalContentAlignment" Value="Center" />
         </Style>
-        <Style Selector="TextBox /template/ Border#PART_BorderElement">
-            <Setter Property="CornerRadius" Value="0" />
-        </Style>
         <Style Selector="TextBox:pointerover /template/ Border#PART_BorderElement">
             <Setter Property="BorderBrush" Value="#999999" />
             <Setter Property="Background" Value="#F8F8F8" />
@@ -68,6 +66,59 @@
             <Setter Property="VerticalAlignment" Value="Center" />
         </Style>
 
+        <Style Selector="Expander">
+            <Setter Property="CornerRadius" Value="0" />
+        </Style>
+        <Style Selector="Expander /template/ ToggleButton#ExpanderHeader">
+            <Setter Property="HorizontalContentAlignment" Value="Left" />
+            <Setter Property="Template">
+                <ControlTemplate>
+                    <Border x:Name="ToggleButtonBackground">
+                        <Grid ColumnDefinitions="Auto,*" RowDefinitions="35">
+                            <Border x:Name="ExpandCollapseChevronBorder"
+                                    Grid.Column="0"
+                                    Width="35"
+                                    Height="35"
+                                    Margin="2,0"
+                                    RenderTransformOrigin="50%,50%">
+                                <Path x:Name="ExpandCollapseChevron"
+                                      HorizontalAlignment="Center"
+                                      VerticalAlignment="Center"
+                                      RenderTransformOrigin="50%,50%"
+                                      Stretch="None"
+                                      Stroke="{DynamicResource ExpanderChevronForeground}"
+                                      StrokeThickness="1" />
+                                <Border.RenderTransform>
+                                    <RotateTransform />
+                                </Border.RenderTransform>
+                            </Border>
+                            <ContentPresenter x:Name="PART_ContentPresenter"
+                                              Grid.Column="1"
+                                              Margin="0"
+                                              HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
+                                              VerticalContentAlignment="Center"
+                                              Background="Transparent"
+                                              BorderBrush="Transparent"
+                                              BorderThickness="0"
+                                              Content="{TemplateBinding Content}"
+                                              ContentTemplate="{TemplateBinding ContentTemplate}"
+                                              TextBlock.Foreground="{DynamicResource ExpanderForeground}" />
+                        </Grid>
+                    </Border>
+                </ControlTemplate>
+            </Setter>
+        </Style>
+
     </Application.Styles>
 
+    <Application.Resources>
+
+        <common:NumberValueConverter x:Key="NumberValueConverter" />
+
+        <Thickness x:Key="ExpanderHeaderPadding">15,0</Thickness>
+        <Thickness x:Key="ExpanderContentPadding">15</Thickness>
+        <SolidColorBrush x:Key="ExpanderDropDownBackground" Color="#FCFCFC" />
+
+    </Application.Resources>
+
 </Application>

app/Desktop/Common/DatabaseGui.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using DHT.Desktop.Dialogs;
+using DHT.Server.Database;
+using DHT.Server.Database.Exceptions;
+using DHT.Server.Database.Sqlite;
+using DHT.Server.Logging;
+
+namespace DHT.Desktop.Common {
+	public static class DatabaseGui {
+		private const string DatabaseFileInitialName = "archive.dht";
+
+		private static readonly List<FileDialogFilter> DatabaseFileDialogFilter = new() {
+			new FileDialogFilter {
+				Name = "Discord History Tracker Database",
+				Extensions = { "dht" }
+			}
+		};
+
+		public static OpenFileDialog NewOpenDatabaseFileDialog() {
+			return new OpenFileDialog {
+				Title = "Open Database File",
+				InitialFileName = DatabaseFileInitialName,
+				Filters = DatabaseFileDialogFilter
+			};
+		}
+
+		public static SaveFileDialog NewOpenOrCreateDatabaseFileDialog() {
+			return new SaveFileDialog {
+				Title = "Open or Create Database File",
+				InitialFileName = DatabaseFileInitialName,
+				Filters = DatabaseFileDialogFilter
+			};
+		}
+
+		public static async Task<IDatabaseFile?> TryOpenOrCreateDatabaseFromPath(string path, Window window, Func<Task<bool>> checkCanUpgradeDatabase) {
+			IDatabaseFile? file = null;
+
+			try {
+				file = await SqliteDatabaseFile.OpenOrCreate(path, checkCanUpgradeDatabase);
+			} catch (InvalidDatabaseVersionException ex) {
+				await Dialog.ShowOk(window, "Database Error", "Database '" + Path.GetFileName(path) + "' appears to be corrupted (invalid version: " + ex.Version + ").");
+			} catch (DatabaseTooNewException ex) {
+				await Dialog.ShowOk(window, "Database Error", "Database '" + Path.GetFileName(path) + "' was opened in a newer version of DHT (database version " + ex.DatabaseVersion + ", app version " + ex.CurrentVersion + ").");
+			} catch (Exception ex) {
+				Log.Error(ex);
+				await Dialog.ShowOk(window, "Database Error", "Database '" + Path.GetFileName(path) + "' could not be opened:" + ex.Message);
+			}
+
+			return file;
+		}
+
+		public static async Task<DialogResult.YesNo> ShowCanUpgradeDatabaseDialog(Window window) {
+			return await Dialog.ShowYesNo(window, "Database Upgrade", "This database was created with an older version of DHT. If you proceed, the database will be upgraded and will no longer open in previous versions of DHT. Do you want to proceed with the upgrade?");
+		}
+
+		public static async Task<DialogResult.YesNo> ShowCanUpgradeMultipleDatabaseDialog(Window window) {
+			return await Dialog.ShowYesNo(window, "Database Upgrade", "One or more databases were created with an older version of DHT. If you proceed, these databases will be upgraded and will no longer open in previous versions of DHT. Otherwise, these databases will be skipped. Do you want to proceed with the upgrade?");
+		}
+	}
+}

app/Desktop/Common/NumberValueConverter.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace DHT.Desktop.Common {
+	public class NumberValueConverter : IValueConverter {
+		public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
+			return string.Format(Program.Culture, "{0:n0}", value);
+		}
+
+		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
+			throw new NotSupportedException();
+		}
+	}
+}

app/Desktop/Common/TextFormat.cs

@@ -0,0 +1,19 @@
+namespace DHT.Desktop.Common {
+	public static class TextFormat {
+		public static string Format(this int number) {
+			return number.ToString("N0", Program.Culture);
+		}
+
+		public static string Format(this long number) {
+			return number.ToString("N0", Program.Culture);
+		}
+
+		public static string Pluralize(this int number, string singular) {
+			return number.Format() + "\u00A0" + (number == 1 ? singular : singular + "s");
+		}
+
+		public static string Pluralize(this long number, string singular) {
+			return number.Format() + "\u00A0" + (number == 1 ? singular : singular + "s");
+		}
+	}
+}

app/Desktop/Desktop.csproj

@@ -12,7 +12,7 @@
     <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
     <SatelliteResourceLanguages>en</SatelliteResourceLanguages>
     <AssemblyName>DiscordHistoryTracker</AssemblyName>
-    <Version>32.0.0.0</Version>
+    <Version>33.1.0.0</Version>
     <AssemblyVersion>$(Version)</AssemblyVersion>
     <FileVersion>$(Version)</FileVersion>
     <PackageVersion>$(Version)</PackageVersion>
@@ -22,12 +22,12 @@
     <DebugType>none</DebugType>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="0.10.3" />
+    <PackageReference Include="Avalonia" Version="0.10.10" />
-    <PackageReference Include="Avalonia.Desktop" Version="0.10.3" />
+    <PackageReference Include="Avalonia.Desktop" Version="0.10.10" />
     <ProjectReference Include="..\Server\Server.csproj" />
   </ItemGroup>
   <ItemGroup Condition=" '$(Configuration)' == 'Debug' ">
-    <PackageReference Include="Avalonia.Diagnostics" Version="0.10.3" />
+    <PackageReference Include="Avalonia.Diagnostics" Version="0.10.10" />
   </ItemGroup>
   <ItemGroup>
     <Compile Update="Windows\MainWindow.axaml.cs">

app/Desktop/Dialogs/CheckBoxDialog.axaml

@@ -0,0 +1,61 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:dialogs="clr-namespace:DHT.Desktop.Dialogs"
+        mc:Ignorable="d" d:DesignWidth="500"
+        x:Class="DHT.Desktop.Dialogs.CheckBoxDialog"
+        Title="{Binding Title}"
+        Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
+        Width="500" SizeToContent="Height" CanResize="False"
+        WindowStartupLocation="CenterOwner">
+
+    <Window.DataContext>
+        <dialogs:CheckBoxDialogModel />
+    </Window.DataContext>
+
+    <Window.Styles>
+        <Style Selector="Panel.buttons">
+            <Setter Property="Margin" Value="0 20 0 0" />
+        </Style>
+        <Style Selector="Panel.buttons > WrapPanel.right">
+            <Setter Property="HorizontalAlignment" Value="Right" />
+        </Style>
+        <Style Selector="Panel.buttons Button">
+            <Setter Property="MinWidth" Value="80" />
+        </Style>
+        <Style Selector="Panel.buttons > WrapPanel.left Button">
+            <Setter Property="Margin" Value="0 0 8 0" />
+        </Style>
+        <Style Selector="Panel.buttons > WrapPanel.right Button">
+            <Setter Property="Margin" Value="8 0 0 0" />
+        </Style>
+    </Window.Styles>
+
+    <StackPanel Margin="20">
+        <ScrollViewer MaxHeight="400">
+            <ItemsControl Items="{Binding Items}">
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate>
+                        <CheckBox IsChecked="{Binding Checked}">
+                            <Label>
+                                <TextBlock Text="{Binding Title}" TextWrapping="Wrap" />
+                            </Label>
+                        </CheckBox>
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
+        </ScrollViewer>
+        <Panel Classes="buttons">
+            <WrapPanel Classes="left">
+                <Button Command="{Binding SelectAll}" IsEnabled="{Binding !AreAllSelected}">Select All</Button>
+                <Button Command="{Binding SelectNone}" IsEnabled="{Binding !AreNoneSelected}">Select None</Button>
+            </WrapPanel>
+            <WrapPanel Classes="right">
+                <Button Click="ClickOk">OK</Button>
+                <Button Click="ClickCancel">Cancel</Button>
+            </WrapPanel>
+        </Panel>
+    </StackPanel>
+
+</Window>

app/Desktop/Dialogs/CheckBoxDialog.axaml.cs

@@ -0,0 +1,28 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+
+namespace DHT.Desktop.Dialogs {
+	public class CheckBoxDialog : Window {
+		public CheckBoxDialog() {
+			InitializeComponent();
+			#if DEBUG
+			this.AttachDevTools();
+			#endif
+		}
+
+		private void InitializeComponent() {
+			AvaloniaXamlLoader.Load(this);
+		}
+
+		public void ClickOk(object? sender, RoutedEventArgs e) {
+			Close(DialogResult.OkCancel.Ok);
+		}
+
+		public void ClickCancel(object? sender, RoutedEventArgs e) {
+			Close(DialogResult.OkCancel.Cancel);
+		}
+	}
+}
+

app/Desktop/Dialogs/CheckBoxDialogModel.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using DHT.Desktop.Models;
+
+namespace DHT.Desktop.Dialogs {
+	public class CheckBoxDialogModel : BaseModel {
+		public string Title { get; init; } = "";
+
+		private IReadOnlyList<CheckBoxItem> items = Array.Empty<CheckBoxItem>();
+
+		public IReadOnlyList<CheckBoxItem> Items {
+			get => items;
+
+			protected set {
+				foreach (var item in items) {
+					item.PropertyChanged -= OnItemPropertyChanged;
+				}
+
+				items = value;
+
+				foreach (var item in items) {
+					item.PropertyChanged += OnItemPropertyChanged;
+				}
+			}
+		}
+
+		private bool pauseCheckEvents = false;
+
+		public bool AreAllSelected => Items.All(item => item.Checked);
+		public bool AreNoneSelected => Items.All(item => !item.Checked);
+
+		public void SelectAll() => SetAllChecked(true);
+		public void SelectNone() => SetAllChecked(false);
+
+		private void SetAllChecked(bool isChecked) {
+			pauseCheckEvents = true;
+
+			foreach (var item in Items) {
+				item.Checked = isChecked;
+			}
+
+			pauseCheckEvents = false;
+			UpdateBulkButtons();
+		}
+
+		private void UpdateBulkButtons() {
+			OnPropertyChanged(nameof(AreAllSelected));
+			OnPropertyChanged(nameof(AreNoneSelected));
+		}
+
+		private void OnItemPropertyChanged(object? sender, PropertyChangedEventArgs e) {
+			if (!pauseCheckEvents && e.PropertyName == nameof(CheckBoxItem.Checked)) {
+				UpdateBulkButtons();
+			}
+		}
+	}
+
+	public class CheckBoxDialogModel<T> : CheckBoxDialogModel {
+		public new IReadOnlyList<CheckBoxItem<T>> Items { get; }
+
+		public IEnumerable<CheckBoxItem<T>> SelectedItems => Items.Where(item => item.Checked);
+
+		public CheckBoxDialogModel(IEnumerable<CheckBoxItem<T>> items) {
+			this.Items = new List<CheckBoxItem<T>>(items);
+			base.Items = this.Items;
+		}
+	}
+}

app/Desktop/Dialogs/CheckBoxItem.cs

@@ -0,0 +1,24 @@
+using DHT.Desktop.Models;
+
+namespace DHT.Desktop.Dialogs {
+	public class CheckBoxItem : BaseModel {
+		public string Title { get; init; } = "";
+		public object? Item { get; init; } = null;
+
+		private bool isChecked = false;
+
+		public bool Checked {
+			get => isChecked;
+			set => Change(ref isChecked, value);
+		}
+	}
+
+	public class CheckBoxItem<T> : CheckBoxItem {
+		public new T Item { get; }
+
+		public CheckBoxItem(T item) {
+			this.Item = item;
+			base.Item = item;
+		}
+	}
+}

app/Desktop/Dialogs/Dialog.cs

@@ -1,9 +1,15 @@
 using System.Threading.Tasks;
 using Avalonia.Controls;
+using Avalonia.Threading;
 
 namespace DHT.Desktop.Dialogs {
 	public static class Dialog {
 		public static async Task ShowOk(Window owner, string title, string message) {
+			if (!Dispatcher.UIThread.CheckAccess()) {
+				await Dispatcher.UIThread.InvokeAsync(() => ShowOk(owner, title, message));
+				return;
+			}
+
 			await new MessageDialog {
 				DataContext = new MessageDialogModel {
 					Title = title,
@@ -14,6 +20,10 @@ namespace DHT.Desktop.Dialogs {
 		}
 
 		public static async Task<DialogResult.OkCancel> ShowOkCancel(Window owner, string title, string message) {
+			if (!Dispatcher.UIThread.CheckAccess()) {
+				return await Dispatcher.UIThread.InvokeAsync(() => ShowOkCancel(owner, title, message));
+			}
+
 			var result = await new MessageDialog {
 				DataContext = new MessageDialogModel {
 					Title = title,
@@ -27,6 +37,10 @@ namespace DHT.Desktop.Dialogs {
 		}
 
 		public static async Task<DialogResult.YesNo> ShowYesNo(Window owner, string title, string message) {
+			if (!Dispatcher.UIThread.CheckAccess()) {
+				return await Dispatcher.UIThread.InvokeAsync(() => ShowYesNo(owner, title, message));
+			}
+
 			var result = await new MessageDialog {
 				DataContext = new MessageDialogModel {
 					Title = title,
@@ -40,6 +54,10 @@ namespace DHT.Desktop.Dialogs {
 		}
 
 		public static async Task<DialogResult.YesNoCancel> ShowYesNoCancel(Window owner, string title, string message) {
+			if (!Dispatcher.UIThread.CheckAccess()) {
+				return await Dispatcher.UIThread.InvokeAsync(() => ShowYesNoCancel(owner, title, message));
+			}
+
 			var result = await new MessageDialog {
 				DataContext = new MessageDialogModel {
 					Title = title,

app/Desktop/Dialogs/IProgressCallback.cs

@@ -0,0 +1,7 @@
+using System.Threading.Tasks;
+
+namespace DHT.Desktop.Dialogs {
+	public interface IProgressCallback {
+		Task Update(string message, int finishedItems, int totalItems);
+	}
+}

app/Desktop/Dialogs/MessageDialog.axaml

@@ -6,7 +6,8 @@
         mc:Ignorable="d" d:DesignWidth="500"
         x:Class="DHT.Desktop.Dialogs.MessageDialog"
         Title="{Binding Title}"
-        Width="500" SizeToContent="Height"
+        Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
+        Width="500" SizeToContent="Height" CanResize="False"
         WindowStartupLocation="CenterOwner">
 
     <Window.DataContext>

app/Desktop/Dialogs/ProgressDialog.axaml

@@ -0,0 +1,42 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:dialogs="clr-namespace:DHT.Desktop.Dialogs"
+        mc:Ignorable="d" d:DesignWidth="500"
+        x:Class="DHT.Desktop.Dialogs.ProgressDialog"
+        Title="{Binding Title}"
+        Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
+        Opened="Loaded"
+        Closing="OnClosing"
+        Width="500" SizeToContent="Height" CanResize="False"
+        WindowStartupLocation="CenterOwner">
+
+    <Window.DataContext>
+        <dialogs:ProgressDialogModel />
+    </Window.DataContext>
+
+    <Window.Styles>
+        <Style Selector="TextBlock">
+            <Setter Property="FontSize" Value="15" />
+            <Setter Property="TextWrapping" Value="Wrap" />
+        </Style>
+        <Style Selector="TextBlock.items">
+            <Setter Property="Margin" Value="10 0 0 0" />
+            <Setter Property="TextAlignment" Value="Right" />
+            <Setter Property="TextWrapping" Value="NoWrap" />
+        </Style>
+        <Style Selector="ProgressBar">
+            <Setter Property="Margin" Value="0 15 0 0" />
+        </Style>
+    </Window.Styles>
+
+    <StackPanel Margin="20">
+        <DockPanel>
+            <TextBlock DockPanel.Dock="Right" Text="{Binding Items}" Classes="items" />
+            <TextBlock DockPanel.Dock="Left" Text="{Binding Message}" />
+        </DockPanel>
+        <ProgressBar Value="{Binding Progress}" />
+    </StackPanel>
+
+</Window>

app/Desktop/Dialogs/ProgressDialog.axaml.cs

@@ -0,0 +1,38 @@
+using System;
+using System.ComponentModel;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace DHT.Desktop.Dialogs {
+	public class ProgressDialog : Window {
+		private bool isFinished = false;
+
+		public ProgressDialog() {
+			InitializeComponent();
+			#if DEBUG
+			this.AttachDevTools();
+			#endif
+		}
+
+		private void InitializeComponent() {
+			AvaloniaXamlLoader.Load(this);
+		}
+
+		public void OnClosing(object? sender, CancelEventArgs e) {
+			e.Cancel = !isFinished;
+		}
+
+		public void Loaded(object? sender, EventArgs e) {
+			if (DataContext is ProgressDialogModel model) {
+				Task.Run(model.StartTask).ContinueWith(OnFinished, TaskScheduler.FromCurrentSynchronizationContext());
+			}
+		}
+
+		private void OnFinished(Task task) {
+			isFinished = true;
+			Close();
+		}
+	}
+}

app/Desktop/Dialogs/ProgressDialogModel.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Threading.Tasks;
+using Avalonia.Threading;
+using DHT.Desktop.Common;
+using DHT.Desktop.Models;
+
+namespace DHT.Desktop.Dialogs {
+	public class ProgressDialogModel : BaseModel {
+		public string Title { get; init; } = "";
+
+		private string message = "";
+
+		public string Message {
+			get => message;
+			private set => Change(ref message, value);
+		}
+
+		private string items = "";
+
+		public string Items {
+			get => items;
+			private set => Change(ref items, value);
+		}
+
+		private int progress = 0;
+
+		public int Progress {
+			get => progress;
+			private set => Change(ref progress, value);
+		}
+
+		private readonly TaskRunner? task;
+
+		[Obsolete("Designer")]
+		public ProgressDialogModel() {}
+
+		public ProgressDialogModel(TaskRunner task) {
+			this.task = task;
+		}
+
+		internal async Task StartTask() {
+			if (task != null) {
+				await task(new Callback(this));
+			}
+		}
+
+		public delegate Task TaskRunner(IProgressCallback callback);
+
+		private class Callback : IProgressCallback {
+			private readonly ProgressDialogModel model;
+
+			public Callback(ProgressDialogModel model) {
+				this.model = model;
+			}
+
+			async Task IProgressCallback.Update(string message, int finishedItems, int totalItems) {
+				await Dispatcher.UIThread.InvokeAsync(() => {
+					model.Message = message;
+					model.Items = finishedItems.Format() + " / " + totalItems.Format();
+					model.Progress = 100 * finishedItems / totalItems;
+				});
+			}
+		}
+	}
+}

app/Desktop/Main/Controls/FilterPanel.axaml

@@ -0,0 +1,57 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:controls="clr-namespace:DHT.Desktop.Main.Controls"
+             mc:Ignorable="d"
+             x:Class="DHT.Desktop.Main.Controls.FilterPanel">
+
+    <Design.DataContext>
+        <controls:FilterPanelModel />
+    </Design.DataContext>
+
+    <UserControl.Styles>
+        <Style Selector="WrapPanel > StackPanel">
+            <Setter Property="Margin" Value="0 20 40 0" />
+            <Setter Property="Spacing" Value="4" />
+        </Style>
+        <Style Selector="Grid > Label">
+            <Setter Property="VerticalAlignment" Value="Center" />
+        </Style>
+        <Style Selector="Grid > CalendarDatePicker">
+            <Setter Property="CornerRadius" Value="0" />
+            <Setter Property="HorizontalAlignment" Value="Stretch" />
+            <Setter Property="HorizontalContentAlignment" Value="Center" />
+            <Setter Property="VerticalAlignment" Value="Center" />
+            <Setter Property="VerticalContentAlignment" Value="Center" />
+            <Setter Property="IsTodayHighlighted" Value="True" />
+            <Setter Property="SelectedDateFormat" Value="Short" />
+        </Style>
+        <Style Selector="Button">
+            <Setter Property="Margin" Value="0 0 0 8" />
+        </Style>
+    </UserControl.Styles>
+
+    <WrapPanel>
+        <StackPanel>
+            <CheckBox IsChecked="{Binding FilterByDate}">Filter by Date</CheckBox>
+            <Grid ColumnDefinitions="Auto, 4, 125" RowDefinitions="Auto, 4, Auto" Margin="4 0">
+                <Label Grid.Row="0" Grid.Column="0">From:</Label>
+                <CalendarDatePicker Grid.Row="0" Grid.Column="2" x:Name="StartDatePicker" IsEnabled="{Binding FilterByDate}" SelectedDateChanged="CalendarDatePicker_OnSelectedDateChanged" />
+                <Label Grid.Row="2" Grid.Column="0">To:</Label>
+                <CalendarDatePicker Grid.Row="2" Grid.Column="2" x:Name="EndDatePicker" IsEnabled="{Binding FilterByDate}" SelectedDateChanged="CalendarDatePicker_OnSelectedDateChanged" />
+            </Grid>
+        </StackPanel>
+        <StackPanel>
+            <CheckBox IsChecked="{Binding FilterByChannel}">Filter by Channel</CheckBox>
+            <Button Command="{Binding OpenChannelFilterDialog}" IsEnabled="{Binding FilterByChannel}">Select Channels...</Button>
+            <TextBlock Text="{Binding ChannelFilterLabel}" />
+        </StackPanel>
+        <StackPanel>
+            <CheckBox IsChecked="{Binding FilterByUser}">Filter by User</CheckBox>
+            <Button Command="{Binding OpenUserFilterDialog}" IsEnabled="{Binding FilterByUser}">Select Users...</Button>
+            <TextBlock Text="{Binding UserFilterLabel}" />
+        </StackPanel>
+    </WrapPanel>
+
+</UserControl>

app/Desktop/Main/Controls/FilterPanel.axaml.cs

@@ -0,0 +1,32 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace DHT.Desktop.Main.Controls {
+	public class FilterPanel : UserControl {
+		private CalendarDatePicker StartDatePicker => this.FindControl<CalendarDatePicker>("StartDatePicker");
+		private CalendarDatePicker EndDatePicker => this.FindControl<CalendarDatePicker>("EndDatePicker");
+
+		public FilterPanel() {
+			InitializeComponent();
+		}
+
+		private void InitializeComponent() {
+			AvaloniaXamlLoader.Load(this);
+
+			var culture = Program.Culture;
+			foreach (var picker in new CalendarDatePicker[] { StartDatePicker, EndDatePicker }) {
+				picker.FirstDayOfWeek = culture.DateTimeFormat.FirstDayOfWeek;
+				picker.SelectedDateFormat = CalendarDatePickerFormat.Custom;
+				picker.CustomDateFormatString = culture.DateTimeFormat.ShortDatePattern;
+				picker.Watermark = culture.DateTimeFormat.ShortDatePattern;
+			}
+		}
+
+		public void CalendarDatePicker_OnSelectedDateChanged(object? sender, SelectionChangedEventArgs e) {
+			if (DataContext is FilterPanelModel model) {
+				model.StartDate = StartDatePicker.SelectedDate;
+				model.EndDate = EndDatePicker.SelectedDate;
+			}
+		}
+	}
+}

app/Desktop/Main/Controls/FilterPanelModel.cs

@@ -0,0 +1,236 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using DHT.Desktop.Common;
+using DHT.Desktop.Dialogs;
+using DHT.Desktop.Models;
+using DHT.Server.Data;
+using DHT.Server.Data.Filters;
+using DHT.Server.Database;
+
+namespace DHT.Desktop.Main.Controls {
+	public class FilterPanelModel : BaseModel {
+		private static readonly HashSet<string> FilterProperties = new () {
+			nameof(FilterByDate),
+			nameof(StartDate),
+			nameof(EndDate),
+			nameof(FilterByChannel),
+			nameof(IncludedChannels),
+			nameof(FilterByUser),
+			nameof(IncludedUsers)
+		};
+
+		public event PropertyChangedEventHandler? FilterPropertyChanged;
+
+		public bool HasAnyFilters => FilterByDate || FilterByChannel || FilterByUser;
+
+		private bool filterByDate = false;
+		private DateTime? startDate = null;
+		private DateTime? endDate = null;
+		private bool filterByChannel = false;
+		private HashSet<ulong>? includedChannels = null;
+		private bool filterByUser = false;
+		private HashSet<ulong>? includedUsers = null;
+
+		public bool FilterByDate {
+			get => filterByDate;
+			set => Change(ref filterByDate, value);
+		}
+
+		public DateTime? StartDate {
+			get => startDate;
+			set => Change(ref startDate, value);
+		}
+
+		public DateTime? EndDate {
+			get => endDate;
+			set => Change(ref endDate, value);
+		}
+
+		public bool FilterByChannel {
+			get => filterByChannel;
+			set => Change(ref filterByChannel, value);
+		}
+
+		public HashSet<ulong> IncludedChannels {
+			get => includedChannels ?? db.GetAllChannels().Select(channel => channel.Id).ToHashSet();
+			set => Change(ref includedChannels, value);
+		}
+
+		public bool FilterByUser {
+			get => filterByUser;
+			set => Change(ref filterByUser, value);
+		}
+
+		public HashSet<ulong> IncludedUsers {
+			get => includedUsers ?? db.GetAllUsers().Select(user => user.Id).ToHashSet();
+			set => Change(ref includedUsers, value);
+		}
+
+		private string channelFilterLabel = "";
+
+		public string ChannelFilterLabel {
+			get => channelFilterLabel;
+			set => Change(ref channelFilterLabel, value);
+		}
+
+		private string userFilterLabel = "";
+
+		public string UserFilterLabel {
+			get => userFilterLabel;
+			set => Change(ref userFilterLabel, value);
+		}
+
+		private readonly Window window;
+		private readonly IDatabaseFile db;
+
+		[Obsolete("Designer")]
+		public FilterPanelModel() : this(null!, DummyDatabaseFile.Instance) {}
+
+		public FilterPanelModel(Window window, IDatabaseFile db) {
+			this.window = window;
+			this.db = db;
+
+			UpdateChannelFilterLabel();
+			UpdateUserFilterLabel();
+
+			PropertyChanged += OnPropertyChanged;
+			db.Statistics.PropertyChanged += OnDbStatisticsChanged;
+		}
+
+		private void OnPropertyChanged(object? sender, PropertyChangedEventArgs e) {
+			if (e.PropertyName != null && FilterProperties.Contains(e.PropertyName)) {
+				FilterPropertyChanged?.Invoke(sender, e);
+			}
+
+			if (e.PropertyName is nameof(FilterByChannel) or nameof(IncludedChannels)) {
+				UpdateChannelFilterLabel();
+			}
+			else if (e.PropertyName is nameof(FilterByUser) or nameof(IncludedUsers)) {
+				UpdateUserFilterLabel();
+			}
+		}
+
+		private void OnDbStatisticsChanged(object? sender, PropertyChangedEventArgs e) {
+			if (e.PropertyName == nameof(DatabaseStatistics.TotalChannels)) {
+				UpdateChannelFilterLabel();
+			}
+			else if (e.PropertyName == nameof(DatabaseStatistics.TotalUsers)) {
+				UpdateUserFilterLabel();
+			}
+		}
+
+		public async void OpenChannelFilterDialog() {
+			var servers = db.GetAllServers().ToDictionary(server => server.Id);
+			var items = new List<CheckBoxItem<ulong>>();
+			var included = IncludedChannels;
+
+			foreach (var channel in db.GetAllChannels()) {
+				var channelId = channel.Id;
+				var channelName = channel.Name;
+
+				string title;
+				if (servers.TryGetValue(channel.Server, out var server)) {
+					var titleBuilder = new StringBuilder();
+					var serverType = server.Type;
+
+					titleBuilder.Append('[')
+					            .Append(ServerTypes.ToString(serverType))
+					            .Append("] ");
+
+					if (serverType == ServerType.DirectMessage) {
+						titleBuilder.Append(channelName);
+					}
+					else {
+						titleBuilder.Append(server.Name)
+						            .Append(" - ")
+						            .Append(channelName);
+					}
+
+					title = titleBuilder.ToString();
+				}
+				else {
+					title = channelName;
+				}
+
+				items.Add(new CheckBoxItem<ulong>(channelId) {
+					Title = title,
+					Checked = included.Contains(channelId)
+				});
+			}
+
+			var result = await OpenIdFilterDialog(window, "Included Channels", items);
+			if (result != null) {
+				IncludedChannels = result;
+			}
+		}
+
+		public async void OpenUserFilterDialog() {
+			var items = new List<CheckBoxItem<ulong>>();
+			var included = IncludedUsers;
+
+			foreach (var user in db.GetAllUsers()) {
+				var name = user.Name;
+				var discriminator = user.Discriminator;
+
+				items.Add(new CheckBoxItem<ulong>(user.Id) {
+					Title = discriminator == null ? name : name + " #" + discriminator,
+					Checked = included.Contains(user.Id)
+				});
+			}
+
+			var result = await OpenIdFilterDialog(window, "Included Users", items);
+			if (result != null) {
+				IncludedUsers = result;
+			}
+		}
+
+		private void UpdateChannelFilterLabel() {
+			long total = db.Statistics.TotalChannels;
+			long included = FilterByChannel ? IncludedChannels.Count : total;
+			ChannelFilterLabel = "Selected " + included.Format() + " / " + total.Pluralize("channel") + ".";
+		}
+
+		private void UpdateUserFilterLabel() {
+			long total = db.Statistics.TotalUsers;
+			long included = FilterByUser ? IncludedUsers.Count : total;
+			UserFilterLabel = "Selected " + included.Format() + " / " + total.Pluralize("user") + ".";
+		}
+
+		public MessageFilter CreateFilter() {
+			MessageFilter filter = new();
+
+			if (FilterByDate) {
+				filter.StartDate = StartDate;
+				filter.EndDate = EndDate;
+			}
+
+			if (FilterByChannel) {
+				filter.ChannelIds = new HashSet<ulong>(IncludedChannels);
+			}
+
+			if (FilterByUser) {
+				filter.UserIds = new HashSet<ulong>(IncludedUsers);
+			}
+
+			return filter;
+		}
+
+		private static async Task<HashSet<ulong>?> OpenIdFilterDialog(Window window, string title, List<CheckBoxItem<ulong>> items) {
+			items.Sort((item1, item2) => item1.Title.CompareTo(item2.Title));
+
+			var model = new CheckBoxDialogModel<ulong>(items) {
+				Title = title
+			};
+
+			var dialog = new CheckBoxDialog { DataContext = model };
+			var result = await dialog.ShowDialog<DialogResult.OkCancel>(window);
+
+			return result == DialogResult.OkCancel.Ok ? model.SelectedItems.Select(item => item.Item).ToHashSet() : null;
+		}
+	}
+}

app/Desktop/Main/Controls/StatusBar.axaml

@@ -41,17 +41,17 @@
         <Rectangle />
         <StackPanel Orientation="Vertical">
             <TextBlock Classes="label">Servers</TextBlock>
-            <TextBlock Classes="value" Text="{Binding DatabaseStatistics.TotalServers, StringFormat={}{0:n0}}" />
+            <TextBlock Classes="value" Text="{Binding DatabaseStatistics.TotalServers, Converter={StaticResource NumberValueConverter}}" />
         </StackPanel>
         <Rectangle />
         <StackPanel Orientation="Vertical">
             <TextBlock Classes="label">Channels</TextBlock>
-            <TextBlock Classes="value" Text="{Binding DatabaseStatistics.TotalChannels, StringFormat={}{0:n0}}" />
+            <TextBlock Classes="value" Text="{Binding DatabaseStatistics.TotalChannels, Converter={StaticResource NumberValueConverter}}" />
         </StackPanel>
         <Rectangle />
         <StackPanel Orientation="Vertical">
             <TextBlock Classes="label">Messages</TextBlock>
-            <TextBlock Classes="value" Text="{Binding DatabaseStatistics.TotalMessages, StringFormat={}{0:n0}}" />
+            <TextBlock Classes="value" Text="{Binding DatabaseStatistics.TotalMessages, Converter={StaticResource NumberValueConverter}}" />
         </StackPanel>
     </StackPanel>
 

app/Desktop/Main/MainContentScreen.axaml

@@ -12,7 +12,7 @@
     </Design.DataContext>
 
     <UserControl.Styles>
-        <Style Selector="TabControl WrapPanel">
+        <Style Selector="TabControl ItemsPresenter > WrapPanel">
             <Setter Property="Background" Value="#546A9F" />
         </Style>
         <Style Selector="TabItem">

app/Desktop/Main/MainWindow.axaml

@@ -7,7 +7,7 @@
         x:Class="DHT.Desktop.Main.MainWindow"
         Title="Discord History Tracker"
         Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
-        Width="800" Height="450"
+        Width="800" Height="500"
         MinWidth="480" MinHeight="240"
         WindowStartupLocation="CenterScreen">
 

app/Desktop/Main/Pages/DatabasePage.axaml

@@ -10,12 +10,21 @@
         <pages:DatabasePageModel />
     </Design.DataContext>
 
+    <UserControl.Styles>
+        <Style Selector="WrapPanel > Button">
+            <Setter Property="Margin" Value="0 0 10 10" />
+        </Style>
+    </UserControl.Styles>
+
     <StackPanel Spacing="10">
         <DockPanel>
             <Button Command="{Binding CloseDatabase}" DockPanel.Dock="Right">Close Database</Button>
             <TextBox Text="{Binding Db.Path}" Width="NaN" Margin="0 0 10 0" IsEnabled="True" />
         </DockPanel>
-        <Button Command="{Binding OpenDatabaseFolder}">Open Database Folder</Button>
+        <WrapPanel>
+            <Button Command="{Binding OpenDatabaseFolder}">Open Database Folder</Button>
+            <Button Command="{Binding MergeWithDatabase}">Merge with Database(s)...</Button>
+        </WrapPanel>
     </StackPanel>
 
 </UserControl>

app/Desktop/Main/Pages/DatabasePageModel.cs

@@ -1,10 +1,14 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Text;
+using System.Threading.Tasks;
 using Avalonia.Controls;
+using DHT.Desktop.Common;
 using DHT.Desktop.Dialogs;
 using DHT.Desktop.Models;
 using DHT.Server.Database;
+using DHT.Server.Logging;
 using DHT.Server.Service;
 
 namespace DHT.Desktop.Main.Pages {
@@ -50,9 +54,101 @@ namespace DHT.Desktop.Main.Pages {
 			}
 		}
 
+		public async void MergeWithDatabase() {
+			var fileDialog = DatabaseGui.NewOpenDatabaseFileDialog();
+			fileDialog.Directory = Path.GetDirectoryName(Db.Path);
+			fileDialog.AllowMultiple = true;
+
+			string[]? paths = await fileDialog.ShowAsync(window);
+			if (paths == null || paths.Length == 0) {
+				return;
+			}
+
+			ProgressDialog progressDialog = new ProgressDialog();
+			progressDialog.DataContext = new ProgressDialogModel(async callback => await MergeWithDatabaseFromPaths(Db, paths, progressDialog, callback)) {
+				Title = "Database Merge"
+			};
+
+			await progressDialog.ShowDialog(window);
+		}
+
 		public void CloseDatabase() {
 			ServerLauncher.Stop();
 			DatabaseClosed?.Invoke(this, EventArgs.Empty);
 		}
+
+		private static async Task MergeWithDatabaseFromPaths(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback) {
+			int total = paths.Length;
+
+			DialogResult.YesNo? upgradeResult = null;
+
+			async Task<bool> CheckCanUpgradeDatabase() {
+				upgradeResult ??= total > 1
+					                  ? await DatabaseGui.ShowCanUpgradeMultipleDatabaseDialog(dialog)
+					                  : await DatabaseGui.ShowCanUpgradeDatabaseDialog(dialog);
+
+				return DialogResult.YesNo.Yes == upgradeResult;
+			}
+
+			var oldStatistics = target.Statistics.Clone();
+			int successful = 0;
+			int finished = 0;
+
+			foreach (string path in paths) {
+				await callback.Update(Path.GetFileName(path), finished, total);
+				++finished;
+
+				if (!File.Exists(path)) {
+					await Dialog.ShowOk(dialog, "Database Error", "Database '" + Path.GetFileName(path) + "' no longer exists.");
+					continue;
+				}
+
+				IDatabaseFile? db = await DatabaseGui.TryOpenOrCreateDatabaseFromPath(path, dialog, CheckCanUpgradeDatabase);
+				if (db == null) {
+					continue;
+				}
+
+				try {
+					target.AddFrom(db);
+				} catch (Exception ex) {
+					Log.Error(ex);
+					await Dialog.ShowOk(dialog, "Database Error", "Database '" + Path.GetFileName(path) + "' could not be merged: " + ex.Message);
+					continue;
+				} finally {
+					db.Dispose();
+				}
+
+				++successful;
+			}
+
+			await callback.Update("Done", finished, total);
+
+			if (successful == 0) {
+				await Dialog.ShowOk(dialog, "Database Merge", "Nothing was merged.");
+				return;
+			}
+
+			var newStatistics = target.Statistics;
+			long newServers = newStatistics.TotalServers - oldStatistics.TotalServers;
+			long newChannels = newStatistics.TotalChannels - oldStatistics.TotalChannels;
+			long newMessages = newStatistics.TotalMessages - oldStatistics.TotalMessages;
+
+			StringBuilder message = new StringBuilder();
+			message.Append("Processed ");
+
+			if (successful == total) {
+				message.Append(successful.Pluralize("database file"));
+			}
+			else {
+				message.Append(successful.Format()).Append(" out of ").Append(total.Pluralize("database file"));
+			}
+
+			message.Append(" and added:\n\n  \u2022 ");
+			message.Append(newServers.Pluralize("server")).Append("\n  \u2022 ");
+			message.Append(newChannels.Pluralize("channel")).Append("\n  \u2022 ");
+			message.Append(newMessages.Pluralize("message"));
+
+			await Dialog.ShowOk(dialog, "Database Merge", message.ToString());
+		}
 	}
 }

app/Desktop/Main/Pages/TrackingPage.axaml

@@ -15,6 +15,10 @@
             <Setter Property="FontFamily" Value="Consolas,Courier" />
             <Setter Property="FontSize" Value="15" />
         </Style>
+        <Style Selector="WrapPanel > StackPanel">
+            <Setter Property="Orientation" Value="Vertical" />
+            <Setter Property="Margin" Value="0 0 10 10" />
+        </Style>
     </UserControl.Styles>
 
     <StackPanel Spacing="10">
@@ -26,23 +30,25 @@
             <Button Command="{Binding OnClickToggleButton}" Content="{Binding ToggleButtonText}" IsEnabled="{Binding IsToggleButtonEnabled}" />
         </StackPanel>
         <Expander Header="Advanced Settings">
-            <StackPanel Spacing="10" Margin="0 10 0 0">
+            <StackPanel Spacing="10">
                 <TextBlock TextWrapping="Wrap">
                     The following settings determine how the tracking script communicates with this application. If you change them, you will have to copy and apply the tracking script again.
                 </TextBlock>
-                <StackPanel Orientation="Horizontal" Spacing="10">
+                <WrapPanel>
-                    <StackPanel Orientation="Vertical">
+                    <StackPanel>
                         <Label Target="Port">Port</Label>
                         <TextBox x:Name="Port" Width="70" Text="{Binding InputPort}" />
                     </StackPanel>
-                    <StackPanel Orientation="Vertical">
+                    <StackPanel>
                         <Label Target="Token">Token</Label>
                         <StackPanel Orientation="Horizontal">
                             <TextBox x:Name="Token" Width="200" Text="{Binding InputToken}" />
                         </StackPanel>
                     </StackPanel>
-                    <Button Command="{Binding OnClickRandomizeToken}" VerticalAlignment="Bottom">Randomize Token</Button>
+                    <StackPanel VerticalAlignment="Bottom">
-                </StackPanel>
+                        <Button Command="{Binding OnClickRandomizeToken}">Randomize Token</Button>
+                    </StackPanel>
+                </WrapPanel>
                 <StackPanel Orientation="Horizontal" Spacing="10">
                     <Button IsEnabled="{Binding HasMadeChanges}" Command="{Binding OnClickApplyChanges}">Apply &amp; Restart</Button>
                     <Button IsEnabled="{Binding HasMadeChanges}" Command="{Binding OnClickCancelChanges}">Cancel</Button>

app/Desktop/Main/Pages/TrackingPageModel.cs

@@ -3,7 +3,6 @@ using System.Threading.Tasks;
 using System.Web;
 using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Threading;
 using DHT.Desktop.Dialogs;
 using DHT.Desktop.Main.Controls;
 using DHT.Desktop.Models;
@@ -140,11 +139,9 @@ namespace DHT.Desktop.Main.Pages {
 			IsToggleButtonEnabled = true;
 		}
 
-		private void ServerLauncherOnServerManagementExceptionCaught(object? sender, Exception ex) {
+		private async void ServerLauncherOnServerManagementExceptionCaught(object? sender, Exception ex) {
 			Log.Error(ex);
-
+			await Dialog.ShowOk(window, "Server Error", ex.Message);
-			string message = ex.Message;
-			Dispatcher.UIThread.Post(async () => { await Dialog.ShowOk(window, "Server Error", message); });
 		}
 	}
 }

app/Desktop/Main/Pages/ViewerPage.axaml

@@ -3,6 +3,7 @@
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:pages="clr-namespace:DHT.Desktop.Main.Pages"
+             xmlns:controls="clr-namespace:DHT.Desktop.Main.Controls"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="DHT.Desktop.Main.Pages.ViewerPage">
 
@@ -11,34 +12,27 @@
     </Design.DataContext>
 
     <UserControl.Styles>
-        <Style Selector="Grid > Label">
+        <Style Selector="Expander">
-            <Setter Property="VerticalAlignment" Value="Center" />
+            <Setter Property="Margin" Value="0 25 0 0" />
-        </Style>
-        <Style Selector="Grid > CalendarDatePicker">
-            <Setter Property="HorizontalAlignment" Value="Stretch" />
-            <Setter Property="HorizontalContentAlignment" Value="Center" />
-            <Setter Property="VerticalAlignment" Value="Center" />
-            <Setter Property="VerticalContentAlignment" Value="Center" />
-            <Setter Property="IsTodayHighlighted" Value="True" />
-            <Setter Property="SelectedDateFormat" Value="Short" />
         </Style>
     </UserControl.Styles>
 
-    <StackPanel Orientation="Vertical" Spacing="20">
+    <StackPanel Orientation="Vertical">
         <StackPanel Orientation="Horizontal" VerticalAlignment="Top">
             <Button Command="{Binding OnClickOpenViewer}" Margin="0 0 5 0">Open Viewer</Button>
             <Button Command="{Binding OnClickSaveViewer}" Margin="5 0 0 0">Save Viewer</Button>
         </StackPanel>
-        <TextBlock Text="{Binding ExportedMessageText}" />
+        <TextBlock Text="{Binding ExportedMessageText}" Margin="0 20 0 0" />
-        <StackPanel>
+        <controls:FilterPanel DataContext="{Binding FilterModel}" />
-            <CheckBox IsChecked="{Binding FilterByDate}">Filter by Date</CheckBox>
+        <Expander Header="Database Tools">
-            <Grid ColumnDefinitions="Auto, 4, 140" RowDefinitions="Auto, 4, Auto" Margin="4">
+            <StackPanel Orientation="Vertical" Spacing="10">
-                <Label Grid.Row="0" Grid.Column="0">From:</Label>
+                <StackPanel Orientation="Vertical" Spacing="4">
-                <CalendarDatePicker Grid.Row="0" Grid.Column="2" x:Name="StartDatePicker" IsEnabled="{Binding FilterByDate}" SelectedDateChanged="CalendarDatePicker_OnSelectedDateChanged" />
+                    <RadioButton GroupName="DatabaseToolFilterMode" IsEnabled="{Binding HasFilters}" IsChecked="{Binding DatabaseToolFilterModeKeep}">Keep Only Messages Matching Filters</RadioButton>
-                <Label Grid.Row="2" Grid.Column="0">To:</Label>
+                    <RadioButton GroupName="DatabaseToolFilterMode" IsEnabled="{Binding HasFilters}" IsChecked="{Binding DatabaseToolFilterModeRemove}">Remove Messages Matching Filters</RadioButton>
-                <CalendarDatePicker Grid.Row="2" Grid.Column="2" x:Name="EndDatePicker" IsEnabled="{Binding FilterByDate}" SelectedDateChanged="CalendarDatePicker_OnSelectedDateChanged" />
+                </StackPanel>
-            </Grid>
+                <Button IsEnabled="{Binding HasFilters}" Command="{Binding OnClickApplyFiltersToDatabase}">Apply Filters to Database</Button>
-        </StackPanel>
+            </StackPanel>
+        </Expander>
     </StackPanel>
 
 </UserControl>

app/Desktop/Main/Pages/ViewerPage.axaml.cs

@@ -10,12 +10,5 @@ namespace DHT.Desktop.Main.Pages {
 		private void InitializeComponent() {
 			AvaloniaXamlLoader.Load(this);
 		}
-
-		public void CalendarDatePicker_OnSelectedDateChanged(object? sender, SelectionChangedEventArgs e) {
-			if (DataContext is ViewerPageModel model) {
-				model.StartDate = this.FindControl<CalendarDatePicker>("StartDatePicker").SelectedDate;
-				model.EndDate = this.FindControl<CalendarDatePicker>("EndDatePicker").SelectedDate;
-			}
-		}
 	}
 }

app/Desktop/Main/Pages/ViewerPageModel.cs

@@ -6,6 +6,9 @@ using System.IO;
 using System.Threading.Tasks;
 using System.Web;
 using Avalonia.Controls;
+using DHT.Desktop.Common;
+using DHT.Desktop.Dialogs;
+using DHT.Desktop.Main.Controls;
 using DHT.Desktop.Models;
 using DHT.Desktop.Resources;
 using DHT.Server.Data.Filters;
@@ -16,26 +19,17 @@ namespace DHT.Desktop.Main.Pages {
 	public class ViewerPageModel : BaseModel {
 		public string ExportedMessageText { get; private set; } = "";
 
-		private bool filterByDate = false;
+		public bool DatabaseToolFilterModeKeep { get; set; } = true;
+		public bool DatabaseToolFilterModeRemove { get; set; } = false;
 
-		public bool FilterByDate {
+		private bool hasFilters = false;
-			get => filterByDate;
+
-			set => Change(ref filterByDate, value);
+		public bool HasFilters {
+			get => hasFilters;
+			set => Change(ref hasFilters, value);
 		}
 
-		private DateTime? startDate = null;
+		private FilterPanelModel FilterModel { get; }
-
-		public DateTime? StartDate {
-			get => startDate;
-			set => Change(ref startDate, value);
-		}
-
-		private DateTime? endDate = null;
-
-		public DateTime? EndDate {
-			get => endDate;
-			set => Change(ref endDate, value);
-		}
 
 		private readonly Window window;
 		private readonly IDatabaseFile db;
@@ -47,15 +41,15 @@ namespace DHT.Desktop.Main.Pages {
 			this.window = window;
 			this.db = db;
 
-			this.PropertyChanged += OnPropertyChanged;
+			this.FilterModel = new FilterPanelModel(window, db);
+			this.FilterModel.FilterPropertyChanged += OnFilterPropertyChanged;
 			this.db.Statistics.PropertyChanged += OnDbStatisticsChanged;
 			UpdateStatistics();
 		}
 
-		private void OnPropertyChanged(object? sender, PropertyChangedEventArgs e) {
+		private void OnFilterPropertyChanged(object? sender, PropertyChangedEventArgs e) {
-			if (e.PropertyName is nameof(FilterByDate) or nameof(StartDate) or nameof(EndDate)) {
+			UpdateStatistics();
-				UpdateStatistics();
+			HasFilters = FilterModel.HasAnyFilters;
-			}
 		}
 
 		private void OnDbStatisticsChanged(object? sender, PropertyChangedEventArgs e) {
@@ -64,24 +58,13 @@ namespace DHT.Desktop.Main.Pages {
 			}
 		}
 
-		private MessageFilter CreateFilter() {
-			MessageFilter filter = new();
-
-			if (FilterByDate) {
-				filter.StartDate = StartDate;
-				filter.EndDate = EndDate;
-			}
-
-			return filter;
-		}
-
 		private void UpdateStatistics() {
-			ExportedMessageText = "Will export " + db.CountMessages(CreateFilter()) + " out of " + db.Statistics.TotalMessages + " message(s).";
+			ExportedMessageText = "Will export " + db.CountMessages(FilterModel.CreateFilter()).Format() + " out of " + db.Statistics.TotalMessages.Format() + " message(s).";
 			OnPropertyChanged(nameof(ExportedMessageText));
 		}
 
 		private async Task<string> GenerateViewerContents() {
-			string json = ViewerJsonExport.Generate(db, CreateFilter());
+			string json = ViewerJsonExport.Generate(db, FilterModel.CreateFilter());
 
 			string index = await ResourceLoader.ReadTextAsync("Viewer/index.html");
 			string viewer = index.Replace("/*[JS]*/", await ResourceLoader.ReadJoinedAsync("Viewer/scripts/", '\n'))
@@ -97,7 +80,8 @@ namespace DHT.Desktop.Main.Pages {
 			int counter = 0;
 
 			while (File.Exists(fullPath)) {
-				fullPath = Path.Combine(rootPath, filenameBase + "-" + (++counter) + ".html");
+				++counter;
+				fullPath = Path.Combine(rootPath, filenameBase + "-" + counter + ".html");
 			}
 
 			Directory.CreateDirectory(rootPath);
@@ -119,10 +103,25 @@ namespace DHT.Desktop.Main.Pages {
 				}
 			}.ShowAsync(window);
 
-			string path = await dialog;
+			string? path = await dialog;
 			if (!string.IsNullOrEmpty(path)) {
 				await File.WriteAllTextAsync(path, await GenerateViewerContents());
 			}
 		}
+
+		public async void OnClickApplyFiltersToDatabase() {
+			var filter = FilterModel.CreateFilter();
+
+			if (DatabaseToolFilterModeKeep) {
+				if (DialogResult.YesNo.Yes == await Dialog.ShowYesNo(window, "Keep Matching Messages in This Database", db.CountMessages(filter).Pluralize("message") + " will be kept, and the rest will be removed from this database. This action cannot be undone. Proceed?")) {
+					db.RemoveMessages(filter, MessageFilterRemovalMode.KeepMatching);
+				}
+			}
+			else if (DatabaseToolFilterModeRemove) {
+				if (DialogResult.YesNo.Yes == await Dialog.ShowYesNo(window, "Remove Matching Messages in This Database", db.CountMessages(filter).Pluralize("message") + " will be removed from this database. This action cannot be undone. Proceed?")) {
+					db.RemoveMessages(filter, MessageFilterRemovalMode.RemoveMatching);
+				}
+			}
+		}
 	}
 }

app/Desktop/Main/WelcomeScreen.axaml

@@ -28,7 +28,7 @@
 
     <Panel Name="RootPanel">
         <StackPanel Margin="42">
-            <TextBlock Text="{Binding Version, StringFormat=Discord History Tracker v.{0}}" FontSize="25" Margin="0 0 0 30" HorizontalAlignment="Center" />
+            <TextBlock Text="{Binding Version, StringFormat=Discord History Tracker v{0}}" FontSize="25" Margin="0 0 0 30" HorizontalAlignment="Center" />
 
             <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                 <Button Command="{Binding OpenOrCreateDatabase}">Open or Create Database</Button>

app/Desktop/Main/WelcomeScreenModel.cs

@@ -1,14 +1,11 @@
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Threading.Tasks;
 using Avalonia.Controls;
+using DHT.Desktop.Common;
 using DHT.Desktop.Dialogs;
 using DHT.Desktop.Models;
 using DHT.Server.Database;
-using DHT.Server.Database.Exceptions;
-using DHT.Server.Database.Sqlite;
-using DHT.Server.Logging;
 
 namespace DHT.Desktop.Main {
 	public class WelcomeScreenModel : BaseModel {
@@ -29,19 +26,10 @@ namespace DHT.Desktop.Main {
 		}
 
 		public async void OpenOrCreateDatabase() {
-			var dialog = new SaveFileDialog {
+			var dialog = DatabaseGui.NewOpenOrCreateDatabaseFileDialog();
-				Title = "Open or Create Database File",
+			dialog.Directory = Path.GetDirectoryName(dbFilePath);
-				InitialFileName = "archive.dht",
-				Directory = Path.GetDirectoryName(dbFilePath),
-				Filters = new List<FileDialogFilter> {
-					new() {
-						Name = "Discord History Tracker Database",
-						Extensions = { "dht" }
-					}
-				}
-			}.ShowAsync(window);
 
-			string path = await dialog;
+			string? path = await dialog.ShowAsync(window);
 			if (!string.IsNullOrWhiteSpace(path)) {
 				await OpenOrCreateDatabaseFromPath(path);
 			}
@@ -53,24 +41,14 @@ namespace DHT.Desktop.Main {
 			}
 
 			dbFilePath = path;
-
+			Db = await DatabaseGui.TryOpenOrCreateDatabaseFromPath(path, window, CheckCanUpgradeDatabase);
-			try {
-				Db = await SqliteDatabaseFile.OpenOrCreate(path, CheckCanUpgradeDatabase);
-			} catch (InvalidDatabaseVersionException ex) {
-				await Dialog.ShowOk(window, "Database Error", "This database appears to be corrupted (invalid version: " + ex.Version + ").");
-			} catch (DatabaseTooNewException ex) {
-				await Dialog.ShowOk(window, "Database Error", "This database was opened in a newer version of DHT (database version " + ex.DatabaseVersion + ", app version " + ex.CurrentVersion + ").");
-			} catch (Exception ex) {
-				Log.Error(ex);
-				await Dialog.ShowOk(window, "Database Error", ex.Message);
-			}
 
 			OnPropertyChanged(nameof(Db));
 			OnPropertyChanged(nameof(HasDatabase));
 		}
 
 		private async Task<bool> CheckCanUpgradeDatabase() {
-			return DialogResult.YesNo.Yes == await Dialog.ShowYesNo(window, "Database Upgrade", "This database was created with an older version of DHT. If you proceed, the database will be upgraded and will no longer open in previous versions of DHT. Do you want to proceed?");
+			return DialogResult.YesNo.Yes == await DatabaseGui.ShowCanUpgradeDatabaseDialog(window);
 		}
 
 		public void CloseDatabase() {
@@ -81,7 +59,7 @@ namespace DHT.Desktop.Main {
 		}
 
 		public async void ShowAboutDialog() {
-			await new AboutWindow() { DataContext = new AboutWindowModel() }.ShowDialog(this.window);
+			await new AboutWindow { DataContext = new AboutWindowModel() }.ShowDialog(this.window);
 		}
 
 		public void Exit() {

app/Desktop/Program.cs

@@ -5,6 +5,7 @@ using Avalonia;
 namespace DHT.Desktop {
 	internal static class Program {
 		public static string Version { get; }
+		public static CultureInfo Culture { get; }
 
 		static Program() {
 			Version = Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "";
@@ -12,6 +13,7 @@ namespace DHT.Desktop {
 				Version = Version[..^2];
 			}
 
+			Culture = CultureInfo.CurrentCulture;
 			CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
 			CultureInfo.CurrentUICulture = CultureInfo.InvariantCulture;
 			CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;

app/Resources/Tracker/scripts/discord.js

@@ -157,7 +157,7 @@ class DISCORD {
 			if (dms) {
 				let name;
 				
-				for (const ele of dms.querySelectorAll("[class*='channel-'][class*='selected-'] [class^='name-'] *")) {
+				for (const ele of dms.querySelectorAll("[class*='channel-'] [class*='selected-'] [class^='name-'] *, [class*='channel-'][class*='selected-'] [class^='name-'] *")) {
 					const node = Array.prototype.find.call(ele.childNodes, node => node.nodeType === Node.TEXT_NODE);
 					
 					if (node) {

app/Server/Data/Filters/MessageFilter.cs

@@ -6,6 +6,8 @@ namespace DHT.Server.Data.Filters {
 		public DateTime? StartDate { get; set; }
 		public DateTime? EndDate { get; set; }
 
-		public HashSet<ulong> MessageIds { get; } = new();
+		public HashSet<ulong>? ChannelIds { get; set; } = null;
+		public HashSet<ulong>? UserIds { get; set; } = null;
+		public HashSet<ulong>? MessageIds { get; set; } = null;
 	}
 }

app/Server/Data/Filters/MessageFilterRemovalMode.cs

@@ -0,0 +1,6 @@
+namespace DHT.Server.Data.Filters {
+	public enum MessageFilterRemovalMode {
+		KeepMatching,
+		RemoveMatching
+	}
+}

app/Server/Database/DatabaseExtensions.cs

@@ -0,0 +1,16 @@
+namespace DHT.Server.Database {
+	public static class DatabaseExtensions {
+		public static void AddFrom(this IDatabaseFile target, IDatabaseFile source) {
+			foreach (var server in source.GetAllServers()) {
+				target.AddServer(server);
+			}
+
+			foreach (var channel in source.GetAllChannels()) {
+				target.AddChannel(channel);
+			}
+
+			target.AddUsers(source.GetAllUsers().ToArray());
+			target.AddMessages(source.GetMessages().ToArray());
+		}
+	}
+}

app/Server/Database/DatabaseStatistics.cs

@@ -5,6 +5,7 @@ namespace DHT.Server.Database {
 	public class DatabaseStatistics : INotifyPropertyChanged {
 		private long totalServers;
 		private long totalChannels;
+		private long totalUsers;
 		private long totalMessages;
 
 		public long TotalServers {
@@ -17,6 +18,11 @@ namespace DHT.Server.Database {
 			internal set => Change(out totalChannels, value);
 		}
 
+		public long TotalUsers {
+			get => totalUsers;
+			internal set => Change(out totalUsers, value);
+		}
+
 		public long TotalMessages {
 			get => totalMessages;
 			internal set => Change(out totalMessages, value);
@@ -28,5 +34,14 @@ namespace DHT.Server.Database {
 			field = value;
 			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
 		}
+
+		public DatabaseStatistics Clone() {
+			return new DatabaseStatistics {
+				totalServers = totalServers,
+				totalChannels = totalChannels,
+				totalUsers = TotalUsers,
+				totalMessages = totalMessages
+			};
+		}
 	}
 }

app/Server/Database/DummyDatabaseFile.cs

@@ -40,6 +40,8 @@ namespace DHT.Server.Database {
 			return new();
 		}
 
+		public void RemoveMessages(MessageFilter filter, MessageFilterRemovalMode mode) {}
+
 		public void Dispose() {
 			GC.SuppressFinalize(this);
 		}

app/Server/Database/Export/ViewerJsonExport.cs

@@ -8,26 +8,48 @@ using DHT.Server.Data.Filters;
 namespace DHT.Server.Database.Export {
 	public static class ViewerJsonExport {
 		public static string Generate(IDatabaseFile db, MessageFilter? filter = null) {
-			JsonSerializerOptions opts = new();
+			var includedUserIds = new HashSet<ulong>();
+			var includedChannelIds = new HashSet<ulong>();
+			var includedServerIds = new HashSet<ulong>();
+
+			var includedMessages = db.GetMessages(filter);
+			var includedChannels = new List<Channel>();
+
+			foreach (var message in includedMessages) {
+				includedUserIds.Add(message.Sender);
+				includedChannelIds.Add(message.Channel);
+			}
+
+			foreach (var channel in db.GetAllChannels()) {
+				if (includedChannelIds.Contains(channel.Id)) {
+					includedChannels.Add(channel);
+					includedServerIds.Add(channel.Server);
+				}
+			}
+
+			var opts = new JsonSerializerOptions();
 			opts.Converters.Add(new ViewerJsonSnowflakeSerializer());
 
-			var users = GenerateUserList(db, out var userindex, out var userIndices);
+			var users = GenerateUserList(db, includedUserIds, out var userindex, out var userIndices);
-			var servers = GenerateServerList(db, out var serverindex);
+			var servers = GenerateServerList(db, includedServerIds, out var serverindex);
-			var channels = GenerateChannelList(db, serverindex);
+			var channels = GenerateChannelList(includedChannels, serverindex);
 
 			return JsonSerializer.Serialize(new {
 				meta = new { users, userindex, servers, channels },
-				data = GenerateMessageList(db, filter, userIndices)
+				data = GenerateMessageList(includedMessages, userIndices)
 			}, opts);
 		}
 
-		private static dynamic GenerateUserList(IDatabaseFile db, out List<string> userindex, out Dictionary<ulong, int> userIndices) {
+		private static dynamic GenerateUserList(IDatabaseFile db, HashSet<ulong> userIds, out List<string> userindex, out Dictionary<ulong, int> userIndices) {
 			var users = new Dictionary<string, dynamic>();
 			userindex = new List<string>();
 			userIndices = new Dictionary<ulong, int>();
 
 			foreach (var user in db.GetAllUsers()) {
-				var id = user.Id.ToString();
+				var id = user.Id;
+				if (!userIds.Contains(id)) {
+					continue;
+				}
 
 				dynamic obj = new ExpandoObject();
 				obj.name = user.Name;
@@ -40,20 +62,26 @@ namespace DHT.Server.Database.Export {
 					obj.tag = user.Discriminator;
 				}
 
-				userIndices[user.Id] = users.Count;
+				var idStr = id.ToString();
-				userindex.Add(id);
+				userIndices[id] = users.Count;
-				users[id] = obj;
+				userindex.Add(idStr);
+				users[idStr] = obj;
 			}
 
 			return users;
 		}
 
-		private static dynamic GenerateServerList(IDatabaseFile db, out Dictionary<ulong, int> serverIndices) {
+		private static dynamic GenerateServerList(IDatabaseFile db, HashSet<ulong> serverIds, out Dictionary<ulong, int> serverIndices) {
 			var servers = new List<dynamic>();
 			serverIndices = new Dictionary<ulong, int>();
 
 			foreach (var server in db.GetAllServers()) {
-				serverIndices[server.Id] = servers.Count;
+				var id = server.Id;
+				if (!serverIds.Contains(id)) {
+					continue;
+				}
+
+				serverIndices[id] = servers.Count;
 				servers.Add(new {
 					name = server.Name,
 					type = ServerTypes.ToJsonViewerString(server.Type)
@@ -63,10 +91,10 @@ namespace DHT.Server.Database.Export {
 			return servers;
 		}
 
-		private static dynamic GenerateChannelList(IDatabaseFile db, Dictionary<ulong, int> serverIndices) {
+		private static dynamic GenerateChannelList(List<Channel> includedChannels, Dictionary<ulong, int> serverIndices) {
 			var channels = new Dictionary<string, dynamic>();
 
-			foreach (var channel in db.GetAllChannels()) {
+			foreach (var channel in includedChannels) {
 				dynamic obj = new ExpandoObject();
 				obj.server = serverIndices[channel.Server];
 				obj.name = channel.Name;
@@ -93,10 +121,10 @@ namespace DHT.Server.Database.Export {
 			return channels;
 		}
 
-		private static dynamic GenerateMessageList(IDatabaseFile db, MessageFilter? filter, Dictionary<ulong, int> userIndices) {
+		private static dynamic GenerateMessageList(List<Message> includedMessages, Dictionary<ulong, int> userIndices) {
 			var data = new Dictionary<string, Dictionary<string, dynamic>>();
 
-			foreach (var grouping in db.GetMessages(filter).GroupBy(message => message.Channel)) {
+			foreach (var grouping in includedMessages.GroupBy(message => message.Channel)) {
 				var channel = grouping.Key.ToString();
 				var channelData = new Dictionary<string, dynamic>();
 

app/Server/Database/IDatabaseFile.cs

@@ -20,5 +20,6 @@ namespace DHT.Server.Database {
 		void AddMessages(Message[] messages);
 		int CountMessages(MessageFilter? filter = null);
 		List<Message> GetMessages(MessageFilter? filter = null);
+		void RemoveMessages(MessageFilter filter, MessageFilterRemovalMode mode);
 	}
 }

app/Server/Database/Sqlite/Schema.cs

@@ -80,7 +80,7 @@ namespace DHT.Server.Database.Sqlite {
 
 			Execute(@"CREATE TABLE attachments (
 			        message_id INTEGER NOT NULL,
-                    attachment_id INTEGER NOT NULL PRIMARY KEY NOT NULL,
+			        attachment_id INTEGER NOT NULL PRIMARY KEY NOT NULL,
 			        name TEXT NOT NULL,
 			        type TEXT,
 			        url TEXT NOT NULL,

app/Server/Database/Sqlite/SqliteDatabaseFile.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Text;
 using System.Threading.Tasks;
 using DHT.Server.Collections;
 using DHT.Server.Data;
@@ -32,6 +33,7 @@ namespace DHT.Server.Database.Sqlite {
 			this.Statistics = new DatabaseStatistics();
 			UpdateServerStatistics();
 			UpdateChannelStatistics();
+			UpdateUserStatistics();
 			UpdateMessageStatistics();
 		}
 
@@ -129,6 +131,7 @@ namespace DHT.Server.Database.Sqlite {
 			}
 
 			tx.Commit();
+			UpdateUserStatistics();
 		}
 
 		public List<User> GetAllUsers() {
@@ -301,6 +304,24 @@ namespace DHT.Server.Database.Sqlite {
 			return list;
 		}
 
+		public void RemoveMessages(MessageFilter filter, MessageFilterRemovalMode mode) {
+			var whereClause = filter.GenerateWhereClause(invert: mode == MessageFilterRemovalMode.KeepMatching);
+			if (string.IsNullOrEmpty(whereClause)) {
+				return;
+			}
+
+			// Rider is being stupid...
+			StringBuilder build = new StringBuilder()
+			                      .Append("DELETE ")
+			                      .Append("FROM messages")
+			                      .Append(whereClause);
+
+			using var cmd = conn.Command(build.ToString());
+			cmd.ExecuteNonQuery();
+
+			UpdateMessageStatistics();
+		}
+
 		private MultiDictionary<ulong, Attachment> GetAllAttachments() {
 			var dict = new MultiDictionary<ulong, Attachment>();
 
@@ -369,6 +390,11 @@ namespace DHT.Server.Database.Sqlite {
 			Statistics.TotalChannels = cmd.ExecuteScalar() as long? ?? 0;
 		}
 
+		private void UpdateUserStatistics() {
+			using var cmd = conn.Command("SELECT COUNT(*) FROM users");
+			Statistics.TotalUsers = cmd.ExecuteScalar() as long? ?? 0;
+		}
+
 		private void UpdateMessageStatistics() {
 			using var cmd = conn.Command("SELECT COUNT(*) FROM messages");
 			Statistics.TotalMessages = cmd.ExecuteScalar() as long? ?? 0L;

app/Server/Database/Sqlite/SqliteMessageFilter.cs

@@ -1,11 +1,10 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using DHT.Server.Data.Filters;
 
 namespace DHT.Server.Database.Sqlite {
 	public static class SqliteMessageFilter {
-		public static string GenerateWhereClause(this MessageFilter? filter) {
+		public static string GenerateWhereClause(this MessageFilter? filter, bool invert = false) {
 			if (filter == null) {
 				return "";
 			}
@@ -15,15 +14,33 @@ namespace DHT.Server.Database.Sqlite {
 			if (filter.StartDate != null) {
 				conditions.Add("timestamp >= " + new DateTimeOffset(filter.StartDate.Value).ToUnixTimeMilliseconds());
 			}
+
 			if (filter.EndDate != null) {
 				conditions.Add("timestamp <= " + new DateTimeOffset(filter.EndDate.Value).ToUnixTimeMilliseconds());
 			}
 
-			if (filter.MessageIds.Count > 0) {
+			if (filter.ChannelIds != null) {
-				conditions.Add("(" + string.Join(" OR ", filter.MessageIds.Select(id => "message_id = " + id)) + ")");
+				conditions.Add("channel_id IN (" + string.Join(",", filter.ChannelIds) + ")");
 			}
 
-			return conditions.Count == 0 ? "" : " WHERE " + string.Join(" AND ", conditions);
+			if (filter.UserIds != null) {
+				conditions.Add("sender_id IN (" + string.Join(",", filter.UserIds) + ")");
+			}
+
+			if (filter.MessageIds != null) {
+				conditions.Add("message_id IN (" + string.Join(",", filter.MessageIds) + ")");
+			}
+
+			if (conditions.Count == 0) {
+				return "";
+			}
+
+			if (invert) {
+				return " WHERE NOT (" + string.Join(" AND ", conditions) + ")";
+			}
+			else {
+				return " WHERE " + string.Join(" AND ", conditions);
+			}
 		}
 	}
 }

app/Server/Endpoints/TrackMessagesEndpoint.cs

@@ -22,17 +22,19 @@ namespace DHT.Server.Endpoints {
 				throw new HttpException(HttpStatusCode.BadRequest, "Expected root element to be an array.");
 			}
 
-			MessageFilter addedMessageIdFilter = new();
+			var addedMessageIds = new HashSet<ulong>();
-			Message[] messages = new Message[root.GetArrayLength()];
+			var messages = new Message[root.GetArrayLength()];
 
 			int i = 0;
 			foreach (JsonElement ele in root.EnumerateArray()) {
 				var message = ReadMessage(ele, "message");
 				messages[i++] = message;
-				addedMessageIdFilter.MessageIds.Add(message.Id);
+				addedMessageIds.Add(message.Id);
 			}
 
-			bool anyNewMessages = Db.CountMessages(addedMessageIdFilter) < messages.Length;
+			var addedMessageFilter = new MessageFilter { MessageIds = addedMessageIds };
+			bool anyNewMessages = Db.CountMessages(addedMessageFilter) < messages.Length;
+
 			Db.AddMessages(messages);
 
 			return (HttpStatusCode.OK, anyNewMessages ? 1 : 0);

app/Server/Endpoints/TrackUsersEndpoint.cs

@@ -18,7 +18,7 @@ namespace DHT.Server.Endpoints {
 				throw new HttpException(HttpStatusCode.BadRequest, "Expected root element to be an array.");
 			}
 
-			User[] users = new User[root.GetArrayLength()];
+			var users = new User[root.GetArrayLength()];
 			int i = 0;
 
 			foreach (JsonElement user in root.EnumerateArray()) {

app/Server/Server.csproj

@@ -8,7 +8,7 @@
     <Authors>chylex</Authors>
     <Company>DiscordHistoryTracker</Company>
     <Product>DiscordHistoryTrackerServer</Product>
-    <Version>32.0.0.0</Version>
+    <Version>33.1.0.0</Version>
     <AssemblyVersion>$(Version)</AssemblyVersion>
     <FileVersion>$(Version)</FileVersion>
     <PackageVersion>$(Version)</PackageVersion>

app/Server/Service/ServerStartup.cs

@@ -16,7 +16,7 @@ namespace DHT.Server.Service {
 
 			services.AddCors(cors => {
 				cors.AddDefaultPolicy(builder => {
-					builder.WithOrigins("https://discord.com").AllowCredentials().AllowAnyMethod().AllowAnyHeader();
+					builder.WithOrigins("https://discord.com", "https://discordapp.com").AllowCredentials().AllowAnyMethod().AllowAnyHeader();
 				});
 			});
 		}

app/build.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+if [ ! -f "DiscordHistoryTracker.sln" ]; then
+	echo "Missing DiscordHistoryTracker.sln in working directory!"
+	exit 1
+fi
+
+makezip() {
+	pushd "./bin/$1"
+	zip -9 -r "../$1.zip" .
+	popd
+}
+
+rm -rf "./bin"
+
+configurations=(win-x64 linux-x64 osx-x64)
+
+for cfg in ${configurations[@]}; do
+	dotnet publish Desktop -c Release -r "$cfg" -o "./bin/$cfg" -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -p:PublishReadyToRun=false -p:PublishTrimmed=true --self-contained true
+	makezip "$cfg"
+done
+
+dotnet publish Desktop -c Release -o "./bin/portable" --self-contained false
+makezip "portable"

app/global.json

@@ -0,0 +1,6 @@
+{
+    "sdk": {
+        "version": "5.0.0",
+        "rollForward": "latestMinor"
+    }
+}