Release v46.0

Closes #277

.github/FUNDING.yml

@@ -1,3 +1 @@
-github: chylex
-patreon: chylex
 ko_fi: chylex

README.md

@@ -18,7 +18,7 @@ Folder organization:
 * `app/` contains a Visual Studio solution for the desktop app
 * `web/` contains source code of the [official website](https://dht.chylex.com), which can be used as a template when making your own website
 
-To start editing source code for the desktop app, install the [.NET 8 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/8.0), and then open `app/DiscordHistoryTracker.sln` in [Visual Studio](https://visualstudio.microsoft.com/downloads/) or [Rider](https://www.jetbrains.com/rider/).
+To start editing source code for the desktop app, install the [.NET 9 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/9.0), and then open `app/DiscordHistoryTracker.sln` in [Visual Studio](https://visualstudio.microsoft.com/downloads/) or [Rider](https://www.jetbrains.com/rider/).
 
 ### Building
 
@@ -28,18 +28,18 @@ To build a `Release` version of the desktop app, follow the instructions for you
 
 #### Release – Windows (64-bit)
 
-1. Install [Powershell 5](https://docs.microsoft.com/en-us/powershell/scripting/install/installing-powershell-on-windows) or newer (on Windows 10, the included version of Powershell should be enough)
+1. Install Debian in WSL and open a terminal in the project folder.
+2. Run the `app/build.wsl.sh` script.
+3. Read the [Distribution](#distribution) section below.
 
-Run the `app/build.bat` script, and read the [Distribution](#distribution) section below.
+Note: The build script expects `dotnet.exe` to be installed in `C:\Program Files\dotnet`.
 
 #### Release – Other Operating Systems
 
-1. Install the `zip` package from your repository
-
-Run the `app/build.sh` script, and read the [Distribution](#distribution) section below.
+1. Install the `zip` package from your repository.
+2. Run the `app/build.sh` script.
+3. Read the [Distribution](#distribution) section below.
 
 #### Distribution
 
-The mentioned build scripts will prepare `Release` builds ready for distribution. Once the script finishes, the `app/bin` folder will contain self-contained executables for each major operating system, and a portable version that works on all other systems but requires .NET 8 to be installed.
-
-Note that when building on Windows, the generated `.zip` files for Linux and Mac will not have correct file permissions, so it will not be possible to run them by double-clicking the executable. Since .NET 8 fixed several issues with publishing Windows executables on Linux, I recommend using Linux to build the app for all operating systems.
+The mentioned build scripts will prepare `Release` builds ready for distribution. Once the script finishes, the `app/bin` folder will contain self-contained executables for each major operating system, and a portable version that works on all other systems but requires the ASP.NET Core Runtime to be installed.

app/.editorconfig

@@ -0,0 +1,2 @@
+[*.cs]
+propertychanged.auto_notify = false

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

@@ -13,6 +13,7 @@
         <entry key="Desktop/Main/Controls/MessageFilterPanel.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/Controls/ServerConfigurationPanel.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/Controls/StatusBar.axaml" value="Desktop/Desktop.csproj" />
+        <entry key="Desktop/Main/Dialogs/NewDatabaseSettingsDialog.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/MainWindow.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/Pages/AdvancedPage.axaml" value="Desktop/Desktop.csproj" />
         <entry key="Desktop/Main/Pages/DatabasePage.axaml" value="Desktop/Desktop.csproj" />

app/Desktop/App.axaml

@@ -54,6 +54,22 @@
             <Setter Property="HorizontalAlignment" Value="Stretch" />
         </Style>
 
+        <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>
+
     </Application.Styles>
 
     <Application.Resources>

app/Desktop/Arguments.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using DHT.Utils.Logging;
 
@@ -9,7 +8,7 @@ sealed class Arguments {
 	
 	private const int FirstArgument = 1;
 	
-	public static Arguments Empty => new (Array.Empty<string>());
+	public static Arguments Empty => new ([]);
 	
 	public bool Console { get; }
 	public string? DatabaseFile { get; }
@@ -51,7 +50,7 @@ sealed class Arguments {
 					continue;
 				
 				case "-port": {
-					if (!ushort.TryParse(value, out var port)) {
+					if (!ushort.TryParse(value, out ushort port)) {
 						Log.Warn("Invalid port number: " + value);
 					}
 					else {
@@ -66,7 +65,7 @@ sealed class Arguments {
 					continue;
 				
 				case "-concurrentdownloads":
-					if (!ulong.TryParse(value, out var concurrentDownloads) || concurrentDownloads == 0) {
+					if (!ulong.TryParse(value, out ulong concurrentDownloads) || concurrentDownloads == 0) {
 						Log.Warn("Invalid concurrent downloads count: " + value);
 					}
 					else if (concurrentDownloads > 10) {

app/Desktop/Common/DatabaseGui.cs

@@ -20,7 +20,7 @@ static class DatabaseGui {
 	private const string DatabaseFileInitialName = "archive.dht";
 	
 	private static readonly IReadOnlyList<FilePickerFileType> DatabaseFileDialogFilter = [
-		FileDialogs.CreateFilter("Discord History Tracker Database", ["dht"])
+		FileDialogs.CreateFilter("Discord History Tracker Database", ["dht"]),
 	];
 	
 	public static async Task<string[]> NewOpenDatabaseFilesDialog(Window window, string? suggestedDirectory) {
@@ -28,7 +28,7 @@ static class DatabaseGui {
 			Title = "Open Database File",
 			FileTypeFilter = DatabaseFileDialogFilter,
 			SuggestedStartLocation = await FileDialogs.GetSuggestedStartLocation(window, suggestedDirectory),
-			AllowMultiple = true
+			AllowMultiple = true,
 		});
 	}
 	
@@ -38,7 +38,7 @@ static class DatabaseGui {
 			FileTypeChoices = DatabaseFileDialogFilter,
 			SuggestedFileName = DatabaseFileInitialName,
 			SuggestedStartLocation = await FileDialogs.GetSuggestedStartLocation(window, suggestedDirectory),
-			ShowOverwritePrompt = false
+			ShowOverwritePrompt = false,
 		});
 	}
 	

app/Desktop/Desktop.csproj

@@ -15,15 +15,18 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.11" Condition=" '$(Configuration)' == 'Debug' " />
-    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.11" />
-    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.11" />
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="999.0.0-build.0.g0d941a6a62" />
+    <PackageReference Include="Avalonia" Version="11.2.3" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.2.3" />
+    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.1.5" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.2.3" />
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.2.3" Condition=" '$(Configuration)' == 'Debug' " />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.2.3" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.2.3" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.2.3" />
+    <PackageReference Include="PropertyChanged.SourceGenerator" Version="1.1.1">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
   
   <ItemGroup>

app/Desktop/Dialogs/CheckBox/CheckBoxDialog.axaml

@@ -15,24 +15,6 @@
         <namespace: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">
             <ItemsRepeater ItemsSource="{Binding Items}">

app/Desktop/Dialogs/CheckBox/CheckBoxDialogModel.cs

@@ -1,27 +1,26 @@
-using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
-using CommunityToolkit.Mvvm.ComponentModel;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Dialogs.CheckBox;
 
-class CheckBoxDialogModel : ObservableObject {
+partial class CheckBoxDialogModel {
 	public string Title { get; init; } = "";
 	
-	private IReadOnlyList<CheckBoxItem> items = Array.Empty<CheckBoxItem>();
+	private IReadOnlyList<CheckBoxItem> items = [];
 	
 	public IReadOnlyList<CheckBoxItem> Items {
 		get => items;
 		
 		protected set {
-			foreach (var item in items) {
+			foreach (CheckBoxItem item in items) {
 				item.PropertyChanged -= OnItemPropertyChanged;
 			}
 			
 			items = value;
 			
-			foreach (var item in items) {
+			foreach (CheckBoxItem item in items) {
 				item.PropertyChanged += OnItemPropertyChanged;
 			}
 		}
@@ -29,7 +28,10 @@ class CheckBoxDialogModel : ObservableObject {
 	
 	private bool pauseCheckEvents = false;
 	
+	[DependsOn(nameof(Items))]
 	public bool AreAllSelected => Items.All(static item => item.IsChecked);
+	
+	[DependsOn(nameof(Items))]
 	public bool AreNoneSelected => Items.All(static item => !item.IsChecked);
 	
 	public void SelectAll() => SetAllChecked(true);
@@ -38,7 +40,7 @@ class CheckBoxDialogModel : ObservableObject {
 	private void SetAllChecked(bool isChecked) {
 		pauseCheckEvents = true;
 		
-		foreach (var item in Items) {
+		foreach (CheckBoxItem item in Items) {
 			item.IsChecked = isChecked;
 		}
 		
@@ -47,8 +49,7 @@ class CheckBoxDialogModel : ObservableObject {
 	}
 	
 	private void UpdateBulkButtons() {
-		OnPropertyChanged(nameof(AreAllSelected));
-		OnPropertyChanged(nameof(AreNoneSelected));
+		OnPropertyChanged(new PropertyChangedEventArgs(nameof(Items)));
 	}
 	
 	private void OnItemPropertyChanged(object? sender, PropertyChangedEventArgs e) {
@@ -65,6 +66,6 @@ sealed class CheckBoxDialogModel<T> : CheckBoxDialogModel {
 	
 	public CheckBoxDialogModel(IEnumerable<CheckBoxItem<T>> items) {
 		this.Items = new List<CheckBoxItem<T>>(items);
-		base.Items = this.Items;
+		base.Items = Items;
 	}
 }

app/Desktop/Dialogs/CheckBox/CheckBoxItem.cs

@@ -1,12 +1,12 @@
-using CommunityToolkit.Mvvm.ComponentModel;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Dialogs.CheckBox;
 
-partial class CheckBoxItem : ObservableObject {
+partial class CheckBoxItem {
 	public string Title { get; init; } = "";
 	public object? Item { get; init; } = null;
 	
-	[ObservableProperty]
+	[Notify]
 	private bool isChecked = false;
 }
 

app/Desktop/Dialogs/File/FileDialogs.cs

@@ -8,6 +8,10 @@ using Avalonia.Platform.Storage;
 namespace DHT.Desktop.Dialogs.File;
 
 static class FileDialogs {
+	public static async Task<string[]> OpenFolders(this IStorageProvider storageProvider, FolderPickerOpenOptions options) {
+		return (await storageProvider.OpenFolderPickerAsync(options)).ToLocalPaths();
+	}
+	
 	public static async Task<string[]> OpenFiles(this IStorageProvider storageProvider, FilePickerOpenOptions options) {
 		return (await storageProvider.OpenFilePickerAsync(options)).ToLocalPaths();
 	}
@@ -18,7 +22,7 @@ static class FileDialogs {
 	
 	public static FilePickerFileType CreateFilter(string name, string[] extensions) {
 		return new FilePickerFileType(name) {
-			Patterns = extensions.Select(static ext => "*." + ext).ToArray()
+			Patterns = extensions.Select(static ext => "*." + ext).ToArray(),
 		};
 	}
 	
@@ -26,11 +30,11 @@ static class FileDialogs {
 		return suggestedDirectory == null ? Task.FromResult<IStorageFolder?>(null) : window.StorageProvider.TryGetFolderFromPathAsync(suggestedDirectory);
 	}
 	
-	private static string ToLocalPath(this IStorageFile file) {
-		return file.TryGetLocalPath() ?? throw new NotSupportedException("Local filesystem is not supported.");
+	private static string ToLocalPath(this IStorageItem itme) {
+		return itme.TryGetLocalPath() ?? throw new NotSupportedException("Local filesystem is not supported.");
 	}
 	
-	private static string[] ToLocalPaths(this IReadOnlyList<IStorageFile> files) {
-		return files.Select(ToLocalPath).ToArray();
+	private static string[] ToLocalPaths(this IReadOnlyList<IStorageItem> items) {
+		return items.Select(ToLocalPath).ToArray();
 	}
 }

app/Desktop/Dialogs/Message/Dialog.cs

@@ -15,8 +15,8 @@ static class Dialog {
 			DataContext = new MessageDialogModel {
 				Title = title,
 				Message = message,
-				IsOkVisible = true
-			}
+				IsOkVisible = true,
+			},
 		}.ShowDialog<DialogResult.All>(owner);
 	}
 	
@@ -30,8 +30,8 @@ static class Dialog {
 				Title = title,
 				Message = message,
 				IsOkVisible = true,
-				IsCancelVisible = true
-			}
+				IsCancelVisible = true,
+			},
 		}.ShowDialog<DialogResult.All?>(owner);
 		
 		return result.ToOkCancel();
@@ -47,8 +47,8 @@ static class Dialog {
 				Title = title,
 				Message = message,
 				IsYesVisible = true,
-				IsNoVisible = true
-			}
+				IsNoVisible = true,
+			},
 		}.ShowDialog<DialogResult.All?>(owner);
 		
 		return result.ToYesNo();
@@ -65,8 +65,8 @@ static class Dialog {
 				Message = message,
 				IsYesVisible = true,
 				IsNoVisible = true,
-				IsCancelVisible = true
-			}
+				IsCancelVisible = true,
+			},
 		}.ShowDialog<DialogResult.All?>(owner);
 		
 		return result.ToYesNoCancel();

app/Desktop/Dialogs/Message/DialogResult.cs

@@ -7,26 +7,26 @@ static class DialogResult {
 		Ok,
 		Yes,
 		No,
-		Cancel
+		Cancel,
 	}
 	
 	public enum OkCancel {
 		Closed,
 		Ok,
-		Cancel
+		Cancel,
 	}
 	
 	public enum YesNo {
 		Closed,
 		Yes,
-		No
+		No,
 	}
 	
 	public enum YesNoCancel {
 		Closed,
 		Yes,
 		No,
-		Cancel
+		Cancel,
 	}
 	
 	public static OkCancel ToOkCancel(this All? result) {
@@ -34,7 +34,7 @@ static class DialogResult {
 			null       => OkCancel.Closed,
 			All.Ok     => OkCancel.Ok,
 			All.Cancel => OkCancel.Cancel,
-			_          => throw new ArgumentException("Cannot convert dialog result " + result + " to ok/cancel.")
+			_          => throw new ArgumentException("Cannot convert dialog result " + result + " to ok/cancel."),
 		};
 	}
 	
@@ -43,7 +43,7 @@ static class DialogResult {
 			null    => YesNo.Closed,
 			All.Yes => YesNo.Yes,
 			All.No  => YesNo.No,
-			_       => throw new ArgumentException("Cannot convert dialog result " + result + " to yes/no.")
+			_       => throw new ArgumentException("Cannot convert dialog result " + result + " to yes/no."),
 		};
 	}
 	
@@ -53,7 +53,7 @@ static class DialogResult {
 			All.Yes    => YesNoCancel.Yes,
 			All.No     => YesNoCancel.No,
 			All.Cancel => YesNoCancel.Cancel,
-			_          => throw new ArgumentException("Cannot convert dialog result " + result + " to yes/no/cancel.")
+			_          => throw new ArgumentException("Cannot convert dialog result " + result + " to yes/no/cancel."),
 		};
 	}
 }

app/Desktop/Dialogs/Message/MessageDialog.axaml

@@ -20,24 +20,18 @@
             <Setter Property="FontSize" Value="15" />
             <Setter Property="TextWrapping" Value="Wrap" />
         </Style>
-        <Style Selector="WrapPanel">
-            <Setter Property="HorizontalAlignment" Value="Right" />
-            <Setter Property="Margin" Value="0 8 0 0" />
-        </Style>
-        <Style Selector="Button">
-            <Setter Property="Margin" Value="8 0 0 0" />
-            <Setter Property="MinWidth" Value="80" />
-        </Style>
     </Window.Styles>
 
     <StackPanel Margin="20">
         <TextBlock Text="{Binding Message}" />
-        <WrapPanel>
+        <Panel Classes="buttons">
+            <WrapPanel Classes="right">
                 <Button Click="ClickOk" IsVisible="{Binding IsOkVisible}">OK</Button>
                 <Button Click="ClickYes" IsVisible="{Binding IsYesVisible}">Yes</Button>
                 <Button Click="ClickNo" IsVisible="{Binding IsNoVisible}">No</Button>
                 <Button Click="ClickCancel" IsVisible="{Binding IsCancelVisible}">Cancel</Button>
             </WrapPanel>
+        </Panel>
     </StackPanel>
 
 </Window>

app/Desktop/Dialogs/Progress/IProgressCallback.cs

@@ -3,7 +3,7 @@ using System.Threading.Tasks;
 namespace DHT.Desktop.Dialogs.Progress;
 
 interface IProgressCallback {
-	Task Update(string message, int finishedItems, int totalItems);
+	Task Update(string message, long finishedItems, long totalItems);
 	Task UpdateIndeterminate(string message);
 	Task Hide();
 }

app/Desktop/Dialogs/Progress/ProgressDialog.axaml.cs

@@ -2,63 +2,46 @@ using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Threading.Tasks;
 using Avalonia.Controls;
+using DHT.Utils.Logging;
 
 namespace DHT.Desktop.Dialogs.Progress;
 
 [SuppressMessage("ReSharper", "MemberCanBeInternal")]
 public sealed partial class ProgressDialog : Window {
+	private static readonly Log Log = Log.ForType<ProgressDialog>();
+	
 	internal static async Task Show(Window owner, string title, Func<ProgressDialog, IProgressCallback, Task> action) {
-		var taskCompletionSource = new TaskCompletionSource();
 		var dialog = new ProgressDialog();
-		
-		dialog.DataContext = new ProgressDialogModel(title, async callbacks => {
-			try {
-				await action(dialog, callbacks[0]);
-				taskCompletionSource.SetResult();
-			} catch (Exception e) {
-				taskCompletionSource.SetException(e);
-			}
-		});
-		
+		dialog.DataContext = new ProgressDialogModel(title, async callbacks => await action(dialog, callbacks[0]));
 		await dialog.ShowProgressDialog(owner);
-		await taskCompletionSource.Task;
 	}
 	
-	internal static async Task ShowIndeterminate(Window owner, string title, string message, Func<ProgressDialog, Task> action) {
-		var taskCompletionSource = new TaskCompletionSource();
-		var dialog = new ProgressDialog();
-		
-		dialog.DataContext = new ProgressDialogModel(title, async callbacks => {
-			await callbacks[0].UpdateIndeterminate(message);
-			try {
-				await action(dialog);
-				taskCompletionSource.SetResult();
-			} catch (Exception e) {
-				taskCompletionSource.SetException(e);
-			}
-		});
-		
-		await dialog.ShowProgressDialog(owner);
-		await taskCompletionSource.Task;
-	}
-	
-	internal static async Task<T> ShowIndeterminate<T>(Window owner, string title, string message, Func<ProgressDialog, Task<T>> action) {
+	internal static async Task<T> Show<T>(Window owner, string title, Func<ProgressDialog, IProgressCallback, Task<T>> action) {
 		var taskCompletionSource = new TaskCompletionSource<T>();
 		var dialog = new ProgressDialog();
 		
 		dialog.DataContext = new ProgressDialogModel(title, async callbacks => {
-			await callbacks[0].UpdateIndeterminate(message);
-			try {
-				taskCompletionSource.SetResult(await action(dialog));
-			} catch (Exception e) {
-				taskCompletionSource.SetException(e);
-			}
+			taskCompletionSource.SetResult(await action(dialog, callbacks[0]));
 		});
 		
 		await dialog.ShowProgressDialog(owner);
 		return await taskCompletionSource.Task;
 	}
 	
+	internal static Task ShowIndeterminate(Window owner, string title, string message, Func<ProgressDialog, Task> action) {
+		return Show(owner, title, async (dialog, callback) => {
+			await callback.UpdateIndeterminate(message);
+			await action(dialog);
+		});
+	}
+	
+	internal static Task<T> ShowIndeterminate<T>(Window owner, string title, string message, Func<ProgressDialog, Task<T>> action) {
+		return Show<T>(owner, title, async (dialog, callback) => {
+			await callback.UpdateIndeterminate(message);
+			return await action(dialog);
+		});
+	}
+	
 	private bool isFinished = false;
 	private Task progressTask = Task.CompletedTask;
 	

app/Desktop/Dialogs/Progress/ProgressDialogModel.cs

@@ -10,7 +10,7 @@ namespace DHT.Desktop.Dialogs.Progress;
 sealed class ProgressDialogModel {
 	public string Title { get; init; } = "";
 	
-	public IReadOnlyList<ProgressItem> Items { get; } = Array.Empty<ProgressItem>();
+	public IReadOnlyList<ProgressItem> Items { get; } = [];
 	
 	private readonly TaskRunner? task;
 	
@@ -20,7 +20,7 @@ sealed class ProgressDialogModel {
 	public ProgressDialogModel(string title, TaskRunner task, int progressItems = 1) {
 		this.Title = title;
 		this.task = task;
-		this.Items = Enumerable.Range(0, progressItems).Select(static _ => new ProgressItem()).ToArray();
+		this.Items = Enumerable.Range(start: 0, progressItems).Select(static _ => new ProgressItem()).ToArray();
 	}
 	
 	internal async Task StartTask() {
@@ -38,7 +38,7 @@ sealed class ProgressDialogModel {
 			this.item = item;
 		}
 		
-		public async Task Update(string message, int finishedItems, int totalItems) {
+		public async Task Update(string message, long finishedItems, long totalItems) {
 			await Dispatcher.UIThread.InvokeAsync(() => {
 				item.Message = message;
 				item.Items = totalItems == 0 ? string.Empty : finishedItems.Format() + " / " + totalItems.Format();
@@ -57,7 +57,7 @@ sealed class ProgressDialogModel {
 		}
 		
 		public Task Hide() {
-			return Update(string.Empty, 0, 0);
+			return Update(string.Empty, finishedItems: 0, totalItems: 0);
 		}
 	}
 }

app/Desktop/Dialogs/Progress/ProgressItem.cs

@@ -1,30 +1,23 @@
-using CommunityToolkit.Mvvm.ComponentModel;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Dialogs.Progress;
 
-sealed partial class ProgressItem : ObservableObject {
-	[ObservableProperty(Setter = Access.Private)]
-	[NotifyPropertyChangedFor(nameof(Opacity))]
-	private bool isVisible = false;
-
-	public double Opacity => IsVisible ? 1.0 : 0.0;
-
+sealed partial class ProgressItem {
+	[Notify]
 	private string message = "";
 	
-	public string Message {
-		get => message;
-		set {
-			SetProperty(ref message, value);
-			IsVisible = !string.IsNullOrEmpty(value);
-		}
-	}
-
-	[ObservableProperty]
+	[Notify]
 	private string items = "";
 	
-	[ObservableProperty]
-	private int progress = 0;
+	[Notify]
+	private long progress = 0L;
 	
-	[ObservableProperty]
+	[Notify]
 	private bool isIndeterminate;
+	
+	[DependsOn(nameof(Message))]
+	public bool IsVisible => !string.IsNullOrEmpty(Message);
+	
+	[DependsOn(nameof(IsVisible))]
+	public double Opacity => IsVisible ? 1.0 : 0.0;
 }

app/Desktop/Dialogs/TextBox/TextBoxDialog.axaml

@@ -15,19 +15,6 @@
         <namespace:TextBoxDialogModel />
     </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" />
-            <Setter Property="Margin" Value="8 0 0 0" />
-        </Style>
-    </Window.Styles>
-
     <StackPanel Margin="20">
         <ScrollViewer MaxHeight="400">
             <StackPanel Spacing="10">

app/Desktop/Dialogs/TextBox/TextBoxDialogModel.cs

@@ -1,37 +1,37 @@
-using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
-using CommunityToolkit.Mvvm.ComponentModel;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Dialogs.TextBox;
 
-class TextBoxDialogModel : ObservableObject {
+partial class TextBoxDialogModel {
 	public string Title { get; init; } = "";
 	public string Description { get; init; } = "";
 	
-	private IReadOnlyList<TextBoxItem> items = Array.Empty<TextBoxItem>();
+	private IReadOnlyList<TextBoxItem> items = [];
 	
 	public IReadOnlyList<TextBoxItem> Items {
 		get => items;
 		
 		protected set {
-			foreach (var item in items) {
+			foreach (TextBoxItem item in items) {
 				item.ErrorsChanged -= OnItemErrorsChanged;
 			}
 			
 			items = value;
 			
-			foreach (var item in items) {
+			foreach (TextBoxItem item in items) {
 				item.ErrorsChanged += OnItemErrorsChanged;
 			}
 		}
 	}
 	
+	[DependsOn(nameof(Items))]
 	public bool HasErrors => Items.Any(static item => !item.IsValid);
 	
 	private void OnItemErrorsChanged(object? sender, DataErrorsChangedEventArgs e) {
-		OnPropertyChanged(nameof(HasErrors));
+		OnPropertyChanged(new PropertyChangedEventArgs(nameof(Items)));
 	}
 }
 

app/Desktop/Dialogs/TextBox/TextBoxItem.cs

@@ -1,26 +1,23 @@
 using System;
 using System.Collections;
 using System.ComponentModel;
-using CommunityToolkit.Mvvm.ComponentModel;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Dialogs.TextBox;
 
-class TextBoxItem : ObservableObject, INotifyDataErrorInfo {
+partial class TextBoxItem : INotifyDataErrorInfo {
 	public string Title { get; init; } = "";
 	public object? Item { get; init; } = null;
 	
 	public Func<string, bool> ValidityCheck { get; init; } = static _ => true;
 	public bool IsValid => ValidityCheck(Value);
 	
+	[Notify]
 	private string value = string.Empty;
 	
-	public string Value {
-		get => this.value;
-		set {
-			SetProperty(ref this.value, value);
+	private void OnValueChanged() {
 		ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(nameof(Value)));
 	}
-	}
 	
 	public IEnumerable GetErrors(string? propertyName) {
 		if (propertyName == nameof(Value) && !IsValid) {

app/Desktop/Discord/DiscordAppSettings.cs

@@ -39,7 +39,7 @@ static class DiscordAppSettings {
 	
 	public static async Task<bool?> AreDevToolsEnabled() {
 		try {
-			var settingsJson = await ReadSettingsJson();
+			JsonObject settingsJson = await ReadSettingsJson();
 			return AreDevToolsEnabled(settingsJson);
 		} catch (Exception e) {
 			Log.Error("Cannot read settings file.");
@@ -49,7 +49,7 @@ static class DiscordAppSettings {
 	}
 	
 	private static bool AreDevToolsEnabled(JsonObject json) {
-		return json.TryGetPropertyValue(JsonKeyDevTools, out var node) && node?.GetValueKind() == JsonValueKind.True;
+		return json.TryGetPropertyValue(JsonKeyDevTools, out JsonNode? node) && node?.GetValueKind() == JsonValueKind.True;
 	}
 	
 	public static async Task<SettingsJsonResult> ConfigureDevTools(bool enable) {
@@ -89,7 +89,7 @@ static class DiscordAppSettings {
 			
 			if (File.Exists(JsonBackupFilePath)) {
 				try {
-					File.Move(JsonBackupFilePath, JsonFilePath, true);
+					File.Move(JsonBackupFilePath, JsonFilePath, overwrite: true);
 					Log.Info("Restored settings file from backup.");
 				} catch (Exception e2) {
 					Log.Error("Cannot restore settings file from backup.");

app/Desktop/Discord/SettingsJsonResult.cs

@@ -6,5 +6,5 @@ enum SettingsJsonResult {
 	FileNotFound,
 	ReadError,
 	InvalidJson,
-	WriteError
+	WriteError,
 }

app/Desktop/Main/AboutWindow.axaml

@@ -3,12 +3,12 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:main="clr-namespace:DHT.Desktop.Main"
-        mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="360"
+        mc:Ignorable="d" d:DesignWidth="510" d:DesignHeight="375"
         x:Class="DHT.Desktop.Main.AboutWindow"
         x:DataType="main:AboutWindowModel"
         Title="About Discord History Tracker"
         Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
-        Width="480" Height="360" CanResize="False"
+        Width="510" Height="375" CanResize="False"
         WindowStartupLocation="CenterOwner">
 
     <Design.DataContext>
@@ -16,10 +16,6 @@
     </Design.DataContext>
 
     <Window.Styles>
-        <Style Selector="StackPanel">
-            <Setter Property="Orientation" Value="Horizontal" />
-            <Setter Property="Spacing" Value="5" />
-        </Style>
         <Style Selector="TextBlock">
             <Setter Property="TextWrapping" Value="Wrap" />
             <Setter Property="VerticalAlignment" Value="Center" />
@@ -33,44 +29,45 @@
 
     <StackPanel Orientation="Vertical" Margin="20" Spacing="12">
 
-        <TextBlock VerticalAlignment="Center">
-            Discord History Tracker was created by chylex and released under the MIT license.
-        </TextBlock>
+        <StackPanel Orientation="Vertical" Spacing="3">
+            <TextBlock TextWrapping="Wrap">Discord History Tracker was created by chylex.</TextBlock>
+            <TextBlock>It is available under the MIT license.</TextBlock>
+        </StackPanel>
 
-        <StackPanel>
+        <StackPanel Orientation="Horizontal" Spacing="8">
             <Button Command="{Binding ShowOfficialWebsite}">Official Website</Button>
             <Button Command="{Binding ShowIssueTracker}">Issue Tracker</Button>
             <Button Command="{Binding ShowSourceCode}">Source Code</Button>
         </StackPanel>
 
-        <Grid RowDefinitions="Auto,5,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="175,125,*" Margin="0 10 0 0">
+        <Grid RowDefinitions="Auto,5,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="*,115,95" Margin="0 10 0 0">
             <TextBlock Grid.Row="0" Grid.Column="0" FontWeight="Bold">Third-Party Software</TextBlock>
             <TextBlock Grid.Row="0" Grid.Column="1" FontWeight="Bold">License</TextBlock>
             <TextBlock Grid.Row="0" Grid.Column="2" FontWeight="Bold">Link</TextBlock>
 
-            <TextBlock Grid.Row="2" Grid.Column="0">.NET 8</TextBlock>
+            <TextBlock Grid.Row="2" Grid.Column="0">.NET</TextBlock>
             <TextBlock Grid.Row="2" Grid.Column="1">MIT</TextBlock>
             <Button Grid.Row="2" Grid.Column="2" Command="{Binding ShowLibraryNetCore}">GitHub</Button>
 
             <TextBlock Grid.Row="3" Grid.Column="0">Avalonia</TextBlock>
             <TextBlock Grid.Row="3" Grid.Column="1">MIT</TextBlock>
-            <Button Grid.Row="3" Grid.Column="2" Command="{Binding ShowLibraryAvalonia}">NuGet</Button>
+            <Button Grid.Row="3" Grid.Column="2" Command="{Binding ShowLibraryAvalonia}">GitHub</Button>
 
-            <TextBlock Grid.Row="4" Grid.Column="0">MVVM Toolkit</TextBlock>
+            <TextBlock Grid.Row="4" Grid.Column="0">Rx.NET</TextBlock>
             <TextBlock Grid.Row="4" Grid.Column="1">MIT</TextBlock>
-            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibraryCommunityToolkit}">GitHub</Button>
+            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibraryRxNet}">GitHub</Button>
 
             <TextBlock Grid.Row="5" Grid.Column="0">SQLite</TextBlock>
             <TextBlock Grid.Row="5" Grid.Column="1">Public Domain</TextBlock>
-            <Button Grid.Row="5" Grid.Column="2" Command="{Binding ShowLibrarySqlite}">Official Website</Button>
+            <Button Grid.Row="5" Grid.Column="2" Command="{Binding ShowLibrarySqlite}">Website</Button>
 
             <TextBlock Grid.Row="6" Grid.Column="0">Microsoft.Data.Sqlite</TextBlock>
             <TextBlock Grid.Row="6" Grid.Column="1">Apache-2.0</TextBlock>
             <Button Grid.Row="6" Grid.Column="2" Command="{Binding ShowLibrarySqliteAdoNet}">NuGet</Button>
 
-            <TextBlock Grid.Row="7" Grid.Column="0">Rx.NET</TextBlock>
+            <TextBlock Grid.Row="7" Grid.Column="0">PropertyChanged.SourceGenerator</TextBlock>
             <TextBlock Grid.Row="7" Grid.Column="1">MIT</TextBlock>
-            <Button Grid.Row="7" Grid.Column="2" Command="{Binding ShowLibraryRxNet}">GitHub</Button>
+            <Button Grid.Row="7" Grid.Column="2" Command="{Binding ShowLibraryPropertyChangedSourceGenerator}">GitHub</Button>
         </Grid>
 
     </StackPanel>

app/Desktop/Main/AboutWindowModel.cs

@@ -20,11 +20,11 @@ sealed class AboutWindowModel {
 	}
 	
 	public void ShowLibraryAvalonia() {
-		SystemUtils.OpenUrl("https://www.nuget.org/packages/Avalonia");
+		SystemUtils.OpenUrl("https://github.com/AvaloniaUI/Avalonia");
 	}
 	
-	public void ShowLibraryCommunityToolkit() {
-		SystemUtils.OpenUrl("https://github.com/CommunityToolkit/dotnet");
+	public void ShowLibraryPropertyChangedSourceGenerator() {
+		SystemUtils.OpenUrl("https://github.com/canton7/PropertyChanged.SourceGenerator");
 	}
 	
 	public void ShowLibrarySqlite() {

app/Desktop/Main/Controls/DownloadItemFilterPanelModel.cs

@@ -5,42 +5,43 @@ using System.Linq;
 using System.Reactive.Linq;
 using System.Threading.Tasks;
 using Avalonia.ReactiveUI;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
 using DHT.Server;
 using DHT.Server.Data.Filters;
 using DHT.Server.Data.Settings;
 using DHT.Utils.Logging;
 using DHT.Utils.Tasks;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Controls;
 
-sealed partial class DownloadItemFilterPanelModel : ObservableObject, IAsyncDisposable {
+sealed partial class DownloadItemFilterPanelModel : IAsyncDisposable {
 	private static readonly Log Log = Log.ForType<DownloadItemFilterPanelModel>();
 	
 	public sealed record Unit(string Name, uint Scale);
 	
 	private static readonly Unit[] AllUnits = [
-		new Unit("B", 1),
-		new Unit("kB", 1024),
-		new Unit("MB", 1024 * 1024)
+		new Unit("B", Scale: 1),
+		new Unit("kB", Scale: 1024),
+		new Unit("MB", Scale: 1024 * 1024)
 	];
 	
 	private static readonly HashSet<string> FilterProperties = [
 		nameof(LimitSize),
 		nameof(MaximumSize),
-		nameof(MaximumSizeUnit)
+		nameof(MaximumSizeUnit),
 	];
 	
-	public string FilterStatisticsText { get; private set; } = "";
+	[Notify(Setter.Private)]
+	private string filterStatisticsText = "";
 	
-	[ObservableProperty]
+	[Notify]
 	private bool limitSize = false;
 	
-	[ObservableProperty]
+	[Notify]
 	private ulong maximumSize = 0UL;
 	
-	[ObservableProperty]
+	[Notify]
 	private Unit maximumSizeUnit = AllUnits[0];
 	
 	public IEnumerable<Unit> Units => AllUnits;
@@ -80,7 +81,7 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IAsyncDisp
 		LimitSize = await state.Db.Settings.Get(SettingsKey.DownloadsLimitSize, LimitSize);
 		MaximumSize = await state.Db.Settings.Get(SettingsKey.DownloadsMaximumSize, MaximumSize);
 		
-		if (await state.Db.Settings.Get(SettingsKey.DownloadsMaximumSizeUnit, null) is {} unitName && AllUnits.FirstOrDefault(unit => unit.Name == unitName) is {} unitValue) {
+		if (await state.Db.Settings.Get(SettingsKey.DownloadsMaximumSizeUnit, defaultValue: null) is {} unitName && AllUnits.FirstOrDefault(unit => unit.Name == unitName) is {} unitValue) {
 			MaximumSizeUnit = unitValue;
 		}
 		
@@ -130,7 +131,7 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IAsyncDisp
 	
 	
 	private void UpdateFilterStatistics() {
-		var filter = CreateFilter();
+		DownloadItemFilter filter = CreateFilter();
 		if (filter.IsEmpty) {
 			downloadItemCountTask.Cancel();
 			matchingItemCount = totalItemCount;
@@ -149,11 +150,9 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IAsyncDisp
 	}
 	
 	private void UpdateFilterStatisticsText() {
-		var matchingItemCountStr = matchingItemCount?.Format() ?? "(...)";
-		var totalItemCountStr = totalItemCount?.Format() ?? "(...)";
-
+		string matchingItemCountStr = matchingItemCount?.Format() ?? "(...)";
+		string totalItemCountStr = totalItemCount?.Format() ?? "(...)";
 		FilterStatisticsText = verb + " " + matchingItemCountStr + " out of " + totalItemCountStr + " file" + (totalItemCount is null or 1 ? "." : "s.");
-		OnPropertyChanged(nameof(FilterStatisticsText));
 	}
 	
 	public DownloadItemFilter CreateFilter() {

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

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
 using Avalonia.Controls;
 
 namespace DHT.Desktop.Main.Controls;
@@ -8,8 +9,8 @@ public sealed partial class MessageFilterPanel : UserControl {
 	public MessageFilterPanel() {
 		InitializeComponent();
 		
-		var culture = Program.Culture;
-		foreach (var picker in new CalendarDatePicker[] { StartDatePicker, EndDatePicker }) {
+		CultureInfo culture = Program.Culture;
+		foreach (CalendarDatePicker picker in new CalendarDatePicker[] { StartDatePicker, EndDatePicker }) {
 			picker.FirstDayOfWeek = culture.DateTimeFormat.FirstDayOfWeek;
 			picker.SelectedDateFormat = CalendarDatePickerFormat.Custom;
 			picker.CustomDateFormatString = culture.DateTimeFormat.ShortDatePattern;

app/Desktop/Main/Controls/MessageFilterPanelModel.cs

@@ -7,7 +7,6 @@ using System.Text;
 using System.Threading.Tasks;
 using Avalonia.Controls;
 using Avalonia.ReactiveUI;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
 using DHT.Desktop.Dialogs.CheckBox;
 using DHT.Desktop.Dialogs.Message;
@@ -16,10 +15,11 @@ using DHT.Server;
 using DHT.Server.Data;
 using DHT.Server.Data.Filters;
 using DHT.Utils.Tasks;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Controls;
 
-sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
+sealed partial class MessageFilterPanelModel : IDisposable {
 	private static readonly HashSet<string> FilterProperties = [
 		nameof(FilterByDate),
 		nameof(StartDate),
@@ -27,40 +27,41 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 		nameof(FilterByChannel),
 		nameof(IncludedChannels),
 		nameof(FilterByUser),
-		nameof(IncludedUsers)
+		nameof(IncludedUsers),
 	];
 	
-	public string FilterStatisticsText { get; private set; } = "";
-
 	public event PropertyChangedEventHandler? FilterPropertyChanged;
 	
 	public bool HasAnyFilters => FilterByDate || FilterByChannel || FilterByUser;
 	
-	[ObservableProperty]
+	[Notify]
+	private string filterStatisticsText = "";
+	
+	[Notify]
 	private bool filterByDate = false;
 	
-	[ObservableProperty]
+	[Notify]
 	private DateTime? startDate = null;
 	
-	[ObservableProperty]
+	[Notify]
 	private DateTime? endDate = null;
 	
-	[ObservableProperty]
+	[Notify]
 	private bool filterByChannel = false;
 	
-	[ObservableProperty]
+	[Notify]
 	private HashSet<ulong>? includedChannels = null;
 	
-	[ObservableProperty]
+	[Notify]
 	private bool filterByUser = false;
 	
-	[ObservableProperty]
+	[Notify]
 	private HashSet<ulong>? includedUsers = null;
 	
-	[ObservableProperty]
+	[Notify]
 	private string channelFilterLabel = "";
 	
-	[ObservableProperty]
+	[Notify]
 	private string userFilterLabel = "";
 	
 	private readonly Window window;
@@ -160,7 +161,7 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 	}
 	
 	private void UpdateFilterStatistics() {
-		var filter = CreateFilter();
+		MessageFilter filter = CreateFilter();
 		if (filter.IsEmpty) {
 			exportedMessageCountTask.Cancel();
 			exportedMessageCount = totalMessageCount;
@@ -179,26 +180,24 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 	}
 	
 	private void UpdateFilterStatisticsText() {
-		var exportedMessageCountStr = exportedMessageCount?.Format() ?? "(...)";
-		var totalMessageCountStr = totalMessageCount?.Format() ?? "(...)";
-
+		string exportedMessageCountStr = exportedMessageCount?.Format() ?? "(...)";
+		string totalMessageCountStr = totalMessageCount?.Format() ?? "(...)";
 		FilterStatisticsText = verb + " " + exportedMessageCountStr + " out of " + totalMessageCountStr + " message" + (totalMessageCount is null or 1 ? "." : "s.");
-		OnPropertyChanged(nameof(FilterStatisticsText));
 	}
 	
 	public async Task OpenChannelFilterDialog() {
 		async Task<List<CheckBoxItem<ulong>>> PrepareChannelItems(ProgressDialog dialog) {
 			var items = new List<CheckBoxItem<ulong>>();
-			var servers = await state.Db.Servers.Get().ToDictionaryAsync(static server => server.Id);
+			Dictionary<ulong, DHT.Server.Data.Server> servers = await state.Db.Servers.Get().ToDictionaryAsync(static server => server.Id);
 			
-			await foreach (var channel in state.Db.Channels.Get()) {
-				var channelId = channel.Id;
-				var channelName = channel.Name;
+			await foreach (Channel channel in state.Db.Channels.Get()) {
+				ulong channelId = channel.Id;
+				string channelName = channel.Name;
 				
 				string title;
 				if (servers.TryGetValue(channel.Server, out var server)) {
 					var titleBuilder = new StringBuilder();
-					var serverType = server.Type;
+					ServerType? serverType = server.Type;
 					
 					titleBuilder.Append('[')
 					            .Append(ServerTypes.ToString(serverType))
@@ -221,7 +220,7 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 				
 				items.Add(new CheckBoxItem<ulong>(channelId) {
 					Title = title,
-					IsChecked = IncludedChannels == null || IncludedChannels.Contains(channelId)
+					IsChecked = IncludedChannels == null || IncludedChannels.Contains(channelId),
 				});
 			}
 			
@@ -238,7 +237,7 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 			return;
 		}
 		
-		var result = await OpenIdFilterDialog(Title, items);
+		HashSet<ulong>? result = await OpenIdFilterDialog(Title, items);
 		if (result != null) {
 			IncludedChannels = result;
 		}
@@ -248,10 +247,10 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 		async Task<List<CheckBoxItem<ulong>>> PrepareUserItems(ProgressDialog dialog) {
 			var checkBoxItems = new List<CheckBoxItem<ulong>>();
 			
-			await foreach (var user in state.Db.Users.Get()) {
+			await foreach (User user in state.Db.Users.Get()) {
 				checkBoxItems.Add(new CheckBoxItem<ulong>(user.Id) {
 					Title = user.DisplayName == null ? user.Name : $"{user.DisplayName} ({user.Name})",
-					IsChecked = IncludedUsers == null || IncludedUsers.Contains(user.Id)
+					IsChecked = IncludedUsers == null || IncludedUsers.Contains(user.Id),
 				});
 			}
 			
@@ -268,7 +267,7 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 			return;
 		}
 		
-		var result = await OpenIdFilterDialog(Title, items);
+		HashSet<ulong>? result = await OpenIdFilterDialog(Title, items);
 		if (result != null) {
 			IncludedUsers = result;
 		}
@@ -278,7 +277,7 @@ sealed partial class MessageFilterPanelModel : ObservableObject, IDisposable {
 		items.Sort(static (item1, item2) => item1.Title.CompareTo(item2.Title));
 		
 		var model = new CheckBoxDialogModel<ulong>(items) {
-			Title = title
+			Title = title,
 		};
 		
 		var dialog = new CheckBoxDialog { DataContext = model };

app/Desktop/Main/Controls/ServerConfigurationPanel.axaml

@@ -16,6 +16,10 @@
             <Setter Property="FontFamily" Value="Consolas,Courier" />
             <Setter Property="FontSize" Value="15" />
         </Style>
+        <Style Selector="Label">
+            <Setter Property="Margin" Value="0 5" />
+            <Setter Property="Padding" Value="0" />
+        </Style>
         <Style Selector="WrapPanel > StackPanel">
             <Setter Property="Orientation" Value="Vertical" />
             <Setter Property="Margin" Value="0 0 10 10" />

app/Desktop/Main/Controls/ServerConfigurationPanelModel.cs

@@ -1,30 +1,30 @@
 using System;
+using System.ComponentModel;
 using System.Threading.Tasks;
 using Avalonia.Controls;
 using Avalonia.Threading;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Server;
 using DHT.Server;
 using DHT.Server.Service;
 using DHT.Utils.Logging;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Controls;
 
-sealed partial class ServerConfigurationPanelModel : ObservableObject, IDisposable {
+sealed partial class ServerConfigurationPanelModel : IDisposable {
 	private static readonly Log Log = Log.ForType<ServerConfigurationPanelModel>();
 	
-	[ObservableProperty]
-	[NotifyPropertyChangedFor(nameof(HasMadeChanges))]
+	[Notify]
 	private string inputPort;
 	
-	[ObservableProperty]
-	[NotifyPropertyChangedFor(nameof(HasMadeChanges))]
+	[Notify]
 	private string inputToken;
 	
+	[DependsOn(nameof(InputPort), nameof(InputToken))]
 	public bool HasMadeChanges => ServerConfiguration.Port.ToString() != InputPort || ServerConfiguration.Token != InputToken;
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private bool isToggleServerButtonEnabled = true;
 	
 	public string ToggleServerButtonText => server.IsRunning ? "Stop Server" : "Start Server";
@@ -53,7 +53,7 @@ sealed partial class ServerConfigurationPanelModel : ObservableObject, IDisposab
 	}
 	
 	private void UpdateServerStatus() {
-		OnPropertyChanged(nameof(ToggleServerButtonText));
+		OnPropertyChanged(new PropertyChangedEventArgs(nameof(ToggleServerButtonText)));
 	}
 	
 	private async Task StartServer() {
@@ -106,7 +106,7 @@ sealed partial class ServerConfigurationPanelModel : ObservableObject, IDisposab
 		ServerConfiguration.Port = port;
 		ServerConfiguration.Token = inputToken;
 		
-		OnPropertyChanged(nameof(HasMadeChanges));
+		OnPropertyChanged(new PropertyChangedEventArgs(nameof(HasMadeChanges)));
 		
 		await StartServer();
 	}

app/Desktop/Main/Controls/StatusBarModel.cs

@@ -2,32 +2,32 @@ using System;
 using System.Reactive.Linq;
 using Avalonia.ReactiveUI;
 using Avalonia.Threading;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Server;
 using DHT.Server.Service;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Controls;
 
-sealed partial class StatusBarModel : ObservableObject, IDisposable {
-	[ObservableProperty(Setter = Access.Private)]
+sealed partial class StatusBarModel : IDisposable {
+	[Notify(Setter.Private)]
 	private long? serverCount;
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private long? channelCount;
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private long? messageCount;
 	
-	[ObservableProperty(Setter = Access.Private)]
-	[NotifyPropertyChangedFor(nameof(ServerStatusText))]
+	[Notify(Setter.Private)]
 	private ServerManager.Status serverStatus;
 	
-	public string ServerStatusText => serverStatus switch {
+	[DependsOn(nameof(ServerStatus))]
+	public string ServerStatusText => ServerStatus switch {
 		ServerManager.Status.Starting => "STARTING",
 		ServerManager.Status.Started  => "READY",
 		ServerManager.Status.Stopping => "STOPPING",
 		ServerManager.Status.Stopped  => "STOPPED",
-		_                             => ""
+		_                             => "",
 	};
 	
 	private readonly State state;
@@ -45,7 +45,7 @@ sealed partial class StatusBarModel : ObservableObject, IDisposable {
 		channelCountSubscription = state.Db.Channels.TotalCount.ObserveOn(AvaloniaScheduler.Instance).Subscribe(newChannelCount => ChannelCount = newChannelCount);
 		messageCountSubscription = state.Db.Messages.TotalCount.ObserveOn(AvaloniaScheduler.Instance).Subscribe(newMessageCount => MessageCount = newMessageCount);
 		
-		state.Server.StatusChanged += OnServerStatusChanged;
+		state.Server.StatusChanged += OnStateServerStatusChanged;
 		serverStatus = state.Server.IsRunning ? ServerManager.Status.Started : ServerManager.Status.Stopped;
 	}
 	
@@ -54,10 +54,10 @@ sealed partial class StatusBarModel : ObservableObject, IDisposable {
 		channelCountSubscription.Dispose();
 		messageCountSubscription.Dispose();
 		
-		state.Server.StatusChanged -= OnServerStatusChanged;
+		state.Server.StatusChanged -= OnStateServerStatusChanged;
 	}
 	
-	private void OnServerStatusChanged(object? sender, ServerManager.Status e) {
+	private void OnStateServerStatusChanged(object? sender, ServerManager.Status e) {
 		Dispatcher.UIThread.InvokeAsync(() => ServerStatus = e);
 	}
 }

app/Desktop/Main/Dialogs/NewDatabaseSettingsDialog.axaml

@@ -0,0 +1,57 @@
+<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:namespace="clr-namespace:DHT.Desktop.Main.Dialogs"
+        mc:Ignorable="d" d:DesignWidth="450"
+        x:Class="DHT.Desktop.Main.Dialogs.NewDatabaseSettingsDialog"
+        x:DataType="namespace:NewDatabaseSettingsDialogModel"
+        Title="New Database Settings"
+        Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
+        Closing="OnClosing"
+        Width="450" SizeToContent="Height" CanResize="False"
+        WindowStartupLocation="CenterOwner">
+
+    <Window.DataContext>
+        <namespace:NewDatabaseSettingsDialogModel />
+    </Window.DataContext>
+
+    <Window.Styles>
+        <Style Selector="Label > StackPanel">
+            <Setter Property="Margin" Value="0 4 0 0" />
+            <Setter Property="Orientation" Value="Vertical" />
+            <Setter Property="Spacing" Value="5" />
+        </Style>
+        <Style Selector="TextBlock.dim">
+            <Setter Property="Foreground" Value="DimGray" />
+            <Setter Property="FontSize" Value="13" />
+        </Style>
+    </Window.Styles>
+
+    <StackPanel Orientation="Vertical" Margin="20">
+        <StackPanel Orientation="Vertical" Spacing="15">
+            <CheckBox IsChecked="{Binding SeparateFileForDownloads}">
+                <Label>
+                    <StackPanel>
+                        <TextBlock>Use a Separate Database File for Downloads</TextBlock>
+                        <TextBlock Classes="dim">Downloaded files will be stored separately from messages. This cannot be changed later.</TextBlock>
+                    </StackPanel>
+                </Label>
+            </CheckBox>
+            <CheckBox IsChecked="{Binding DownloadsAutoStart}">
+                <Label>
+                    <StackPanel>
+                        <TextBlock>Download Files Automatically</TextBlock>
+                        <TextBlock Classes="dim">Enables automatic downloads of files hosted on Discord. This can be changed later in the Downloads tab.</TextBlock>
+                    </StackPanel>
+                </Label>
+            </CheckBox>
+        </StackPanel>
+        <Panel Classes="buttons">
+            <WrapPanel Classes="right">
+                <Button Click="ClickOk">OK</Button>
+            </WrapPanel>
+        </Panel>
+    </StackPanel>
+
+</Window>

app/Desktop/Main/Dialogs/NewDatabaseSettingsDialog.axaml.cs

@@ -0,0 +1,22 @@
+using System.Diagnostics.CodeAnalysis;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace DHT.Desktop.Main.Dialogs;
+
+[SuppressMessage("ReSharper", "MemberCanBeInternal")]
+public sealed partial class NewDatabaseSettingsDialog : Window {
+	public NewDatabaseSettingsDialog() {
+		InitializeComponent();
+	}
+	
+	private void OnClosing(object? sender, WindowClosingEventArgs e) {
+		if (!e.IsProgrammatic) {
+			e.Cancel = true;
+		}
+	}
+	
+	private void ClickOk(object? sender, RoutedEventArgs e) {
+		Close();
+	}
+}

app/Desktop/Main/Dialogs/NewDatabaseSettingsDialogModel.cs

@@ -0,0 +1,11 @@
+using PropertyChanged.SourceGenerator;
+
+namespace DHT.Desktop.Main.Dialogs;
+
+sealed partial class NewDatabaseSettingsDialogModel {
+	[Notify]
+	private bool separateFileForDownloads = true;
+	
+	[Notify]
+	private bool downloadsAutoStart = true;
+}

app/Desktop/Main/MainWindowModel.cs

@@ -3,25 +3,25 @@ using System.IO;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Avalonia.Controls;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Main.Screens;
 using DHT.Desktop.Server;
 using DHT.Server;
 using DHT.Server.Database;
 using DHT.Utils.Logging;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main;
 
-sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
+sealed partial class MainWindowModel : IAsyncDisposable {
 	private const string DefaultTitle = "Discord History Tracker";
 	
 	private static readonly Log Log = Log.ForType<MainWindowModel>();
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private string title = DefaultTitle;
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private UserControl currentScreen;
 	
 	private readonly WelcomeScreen welcomeScreen;
@@ -46,7 +46,7 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 		welcomeScreen = new WelcomeScreen { DataContext = welcomeScreenModel };
 		currentScreen = welcomeScreen;
 		
-		var dbFile = args.DatabaseFile;
+		string? dbFile = args.DatabaseFile;
 		if (!string.IsNullOrWhiteSpace(dbFile)) {
 			async void OnWindowOpened(object? o, EventArgs eventArgs) {
 				window.Opened -= OnWindowOpened;

app/Desktop/Main/Pages/AdvancedPage.axaml

@@ -16,11 +16,5 @@
         <Expander Header="Internal Server Configuration" IsExpanded="True">
             <controls:ServerConfigurationPanel DataContext="{Binding ServerConfigurationModel}" />
         </Expander>
-        <Expander Header="Database Tools" IsExpanded="True">
-            <StackPanel Orientation="Vertical" Spacing="10">
-                <TextBlock TextWrapping="Wrap">Recreates the database to remove any traces of deleted data, which frees up space and prevents forensic recovery.</TextBlock>
-                <Button Command="{Binding VacuumDatabase}">Vacuum Database</Button>
-            </StackPanel>
-        </Expander>
     </StackPanel>
 </UserControl>

app/Desktop/Main/Pages/AdvancedPageModel.cs

@@ -1,8 +1,5 @@
 using System;
-using System.Threading.Tasks;
 using Avalonia.Controls;
-using DHT.Desktop.Dialogs.Message;
-using DHT.Desktop.Dialogs.Progress;
 using DHT.Desktop.Main.Controls;
 using DHT.Server;
 
@@ -11,26 +8,14 @@ namespace DHT.Desktop.Main.Pages;
 sealed class AdvancedPageModel : IDisposable {
 	public ServerConfigurationPanelModel ServerConfigurationModel { get; }
 	
-	private readonly Window window;
-	private readonly State state;
-
 	[Obsolete("Designer")]
 	public AdvancedPageModel() : this(null!, State.Dummy) {}
 	
 	public AdvancedPageModel(Window window, State state) {
-		this.window = window;
-		this.state = state;
-
 		ServerConfigurationModel = new ServerConfigurationPanelModel(window, state);
 	}
 	
 	public void Dispose() {
 		ServerConfigurationModel.Dispose();
 	}
-
-	public async Task VacuumDatabase() {
-		const string Title = "Vacuum Database";
-		await ProgressDialog.ShowIndeterminate(window, Title, "Vacuuming database...", _ => state.Db.Vacuum());
-		await Dialog.ShowOk(window, Title, "Done.");
-	}
 }

app/Desktop/Main/Pages/DatabasePage.axaml

@@ -27,6 +27,12 @@
             <Button Command="{Binding MergeWithDatabase}">Merge with Database(s)...</Button>
             <Button Command="{Binding ImportLegacyArchive}">Import Legacy Archive(s)...</Button>
         </WrapPanel>
+        <Expander Header="Advanced Tools" Margin="0 15 0 0">
+            <StackPanel Orientation="Vertical" Spacing="10">
+                <TextBlock TextWrapping="Wrap">Recreate the database to free up space after deleting data.</TextBlock>
+                <Button Command="{Binding VacuumDatabase}">Vacuum Database</Button>
+            </StackPanel>
+        </Expander>
     </StackPanel>
 
 </UserControl>

app/Desktop/Main/Pages/DatabasePageModel.cs

@@ -19,6 +19,7 @@ using DHT.Server.Data;
 using DHT.Server.Database;
 using DHT.Server.Database.Import;
 using DHT.Server.Database.Sqlite.Schema;
+using DHT.Server.Database.Sqlite.Utils;
 using DHT.Utils.Logging;
 
 namespace DHT.Desktop.Main.Pages;
@@ -54,11 +55,11 @@ sealed class DatabasePageModel {
 				break;
 			
 			case PlatformID.Unix:
-				Process.Start("xdg-open", new string[] { folder });
+				Process.Start("xdg-open", [ folder ]);
 				break;
 			
 			case PlatformID.MacOSX:
-				Process.Start("open", new string[] { folder });
+				Process.Start("open", [ folder ]);
 				break;
 			
 			default:
@@ -72,16 +73,29 @@ sealed class DatabasePageModel {
 	}
 	
 	public async Task MergeWithDatabase() {
-		var paths = await DatabaseGui.NewOpenDatabaseFilesDialog(window, Path.GetDirectoryName(Db.Path));
-		if (paths.Length > 0) {
-			await ProgressDialog.Show(window, "Database Merge", async (dialog, callback) => await MergeWithDatabaseFromPaths(Db, paths, dialog, callback));
-		}
+		string[] paths = await DatabaseGui.NewOpenDatabaseFilesDialog(window, Path.GetDirectoryName(Db.Path));
+		if (paths.Length == 0) {
+			return;
 		}
 		
-	private static async Task MergeWithDatabaseFromPaths(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback) {
+		const string Title = "Database Merge";
+		
+		ImportResult? result;
+		try {
+			result = await ProgressDialog.Show(window, Title, async (dialog, callback) => await MergeWithDatabaseFromPaths(Db, paths, dialog, callback));
+		} catch (Exception e) {
+			Log.Error(e);
+			await Dialog.ShowOk(window, Title, "Could not merge databases: " + e.Message);
+			return;
+		}
+		
+		await Dialog.ShowOk(window, Title, GetImportDialogMessage(result, "database file"));
+	}
+	
+	private static async Task<ImportResult?> MergeWithDatabaseFromPaths(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback) {
 		var schemaUpgradeCallbacks = new SchemaUpgradeCallbacks(dialog, paths.Length);
 		
-		await PerformImport(target, paths, dialog, callback, "Database Merge", "Database Error", "database file", async path => {
+		return await PerformImport(target, paths, dialog, callback, "Database Merge", async path => {
 			IDatabaseFile? db = await DatabaseGui.TryOpenOrCreateDatabaseFromPath(path, dialog, schemaUpgradeCallbacks);
 			
 			if (db == null) {
@@ -97,14 +111,11 @@ sealed class DatabasePageModel {
 		});
 	}
 	
-	private sealed class SchemaUpgradeCallbacks : ISchemaUpgradeCallbacks {
-		private readonly ProgressDialog dialog;
-		private readonly int total;
+	private sealed class SchemaUpgradeCallbacks(ProgressDialog dialog, int total) : ISchemaUpgradeCallbacks {
 		private bool? decision;
 		
-		public SchemaUpgradeCallbacks(ProgressDialog dialog, int total) {
-			this.total = total;
-			this.dialog = dialog;
+		public Task<InitialDatabaseSettings?> GetInitialDatabaseSettings() {
+			return Task.FromResult<InitialDatabaseSettings?>(null);
 		}
 		
 		public async Task<bool> CanUpgrade() {
@@ -133,21 +144,34 @@ sealed class DatabasePageModel {
 	}
 	
 	public async Task ImportLegacyArchive() {
-		var paths = await window.StorageProvider.OpenFiles(new FilePickerOpenOptions {
+		string[] paths = await window.StorageProvider.OpenFiles(new FilePickerOpenOptions {
 			Title = "Open Legacy DHT Archive",
 			SuggestedStartLocation = await FileDialogs.GetSuggestedStartLocation(window, Path.GetDirectoryName(Db.Path)),
-			AllowMultiple = true
+			AllowMultiple = true,
 		});
 		
-		if (paths.Length > 0) {
-			await ProgressDialog.Show(window, "Legacy Archive Import", async (dialog, callback) => await ImportLegacyArchiveFromPaths(Db, paths, dialog, callback));
-		}
+		if (paths.Length == 0) {
+			return;
 		}
 		
-	private static async Task ImportLegacyArchiveFromPaths(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback) {
+		const string Title = "Legacy Archive Import";
+		
+		ImportResult? result;
+		try {
+			result = await ProgressDialog.Show(window, Title, async (dialog, callback) => await ImportLegacyArchiveFromPaths(Db, paths, dialog, callback));
+		} catch (Exception e) {
+			Log.Error(e);
+			await Dialog.ShowOk(window, Title, "Could not import legacy archives: " + e.Message);
+			return;
+		}
+		
+		await Dialog.ShowOk(window, Title, GetImportDialogMessage(result, "archive file"));
+	}
+	
+	private static async Task<ImportResult?> ImportLegacyArchiveFromPaths(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback) {
 		var fakeSnowflake = new FakeSnowflake();
 		
-		await PerformImport(target, paths, dialog, callback, "Legacy Archive Import", "Legacy Archive Error", "archive file", async path => {
+		return await PerformImport(target, paths, dialog, callback, "Legacy Archive Import", async path => {
 			await using var jsonStream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
 			
 			return await LegacyArchiveImport.Read(jsonStream, target, fakeSnowflake, async servers => {
@@ -167,16 +191,16 @@ sealed class DatabasePageModel {
 		
 		var items = new List<TextBoxItem<DHT.Server.Data.Server>>();
 		
-		foreach (var server in servers.OrderBy(static server => server.Type).ThenBy(static server => server.Name)) {
+		foreach (DHT.Server.Data.Server server in servers.OrderBy(static server => server.Type).ThenBy(static server => server.Name)) {
 			items.Add(new TextBoxItem<DHT.Server.Data.Server>(server) {
 				Title = server.Name + " (" + ServerTypes.ToNiceString(server.Type) + ")",
-				ValidityCheck = IsValidSnowflake
+				ValidityCheck = IsValidSnowflake,
 			});
 		}
 		
 		var model = new TextBoxDialogModel<DHT.Server.Data.Server>(items) {
 			Title = "Imported Server IDs",
-			Description = "Please fill in the IDs of servers and direct messages. First enable Developer Mode in Discord, then right-click each server or direct message, click 'Copy ID', and paste it into the input field. If a server no longer exists, leave its input field empty to use a random ID."
+			Description = "Please fill in the IDs of servers and direct messages. First enable Developer Mode in Discord, then right-click each server or direct message, click 'Copy ID', and paste it into the input field. If a server no longer exists, leave its input field empty to use a random ID.",
 		};
 		
 		var dialog = new TextBoxDialog { DataContext = model };
@@ -191,9 +215,9 @@ sealed class DatabasePageModel {
 		            .ToDictionary(static item => item.Item, static item => ulong.Parse(item.Value));
 	}
 	
-	private static async Task PerformImport(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback, string neutralDialogTitle, string errorDialogTitle, string itemName, Func<string, Task<bool>> performImport) {
+	private static async Task<ImportResult?> PerformImport(IDatabaseFile target, string[] paths, ProgressDialog dialog, IProgressCallback callback, string dialogTitle, Func<string, Task<bool>> performImport) {
 		int total = paths.Length;
-		var oldStatistics = await DatabaseStatistics.Take(target);
+		DatabaseStatistics oldStatistics = await DatabaseStatistics.Take(target);
 		
 		int successful = 0;
 		int finished = 0;
@@ -203,7 +227,7 @@ sealed class DatabasePageModel {
 			++finished;
 			
 			if (!File.Exists(path)) {
-				await Dialog.ShowOk(dialog, errorDialogTitle, "File '" + Path.GetFileName(path) + "' no longer exists.");
+				await Dialog.ShowOk(dialog, dialogTitle, "File '" + Path.GetFileName(path) + "' no longer exists.");
 				continue;
 			}
 			
@@ -213,19 +237,18 @@ sealed class DatabasePageModel {
 				}
 			} catch (Exception ex) {
 				Log.Error(ex);
-				await Dialog.ShowOk(dialog, errorDialogTitle, "File '" + Path.GetFileName(path) + "' could not be imported: " + ex.Message);
+				await Dialog.ShowOk(dialog, dialogTitle, "File '" + Path.GetFileName(path) + "' could not be imported: " + ex.Message);
 			}
 		}
 		
 		await callback.Update("Done", finished, total);
 		
 		if (successful == 0) {
-			await Dialog.ShowOk(dialog, neutralDialogTitle, "Nothing was imported.");
-			return;
+			return null;
 		}
 		
-		var newStatistics = await DatabaseStatistics.Take(target);
-		await Dialog.ShowOk(dialog, neutralDialogTitle, GetImportDialogMessage(oldStatistics, newStatistics, successful, total, itemName));
+		DatabaseStatistics newStatistics = await DatabaseStatistics.Take(target);
+		return new ImportResult(oldStatistics, newStatistics, successful, total);
 	}
 	
 	private sealed record DatabaseStatistics(long ServerCount, long ChannelCount, long UserCount, long MessageCount) {
@@ -239,20 +262,29 @@ sealed class DatabasePageModel {
 		}
 	}
 	
-	private static string GetImportDialogMessage(DatabaseStatistics oldStatistics, DatabaseStatistics newStatistics, int successfulItems, int totalItems, string itemName) {
+	private sealed record ImportResult(DatabaseStatistics OldStatistics, DatabaseStatistics NewStatistics, int SuccessfulItems, int TotalItems);
+	
+	private static string GetImportDialogMessage(ImportResult? result, string itemName) {
+		if (result == null) {
+			return "Nothing was imported.";
+		}
+		
+		var oldStatistics = result.OldStatistics;
+		var newStatistics = result.NewStatistics;
+		
 		long newServers = newStatistics.ServerCount - oldStatistics.ServerCount;
 		long newChannels = newStatistics.ChannelCount - oldStatistics.ChannelCount;
 		long newUsers = newStatistics.UserCount - oldStatistics.UserCount;
 		long newMessages = newStatistics.MessageCount - oldStatistics.MessageCount;
 		
-		StringBuilder message = new StringBuilder();
+		var message = new StringBuilder();
 		message.Append("Processed ");
 		
-		if (successfulItems == totalItems) {
-			message.Append(successfulItems.Pluralize(itemName));
+		if (result.SuccessfulItems == result.TotalItems) {
+			message.Append(result.SuccessfulItems.Pluralize(itemName));
 		}
 		else {
-			message.Append(successfulItems.Format()).Append(" out of ").Append(totalItems.Pluralize(itemName));
+			message.Append(result.SuccessfulItems.Format()).Append(" out of ").Append(result.TotalItems.Pluralize(itemName));
 		}
 		
 		message.Append(" and added:\n\n  \u2022 ");
@@ -263,4 +295,18 @@ sealed class DatabasePageModel {
 		
 		return message.ToString();
 	}
+	
+	public async Task VacuumDatabase() {
+		const string Title = "Vacuum Database";
+		
+		try {
+			await ProgressDialog.ShowIndeterminate(window, Title, "Vacuuming database...", _ => Db.Vacuum());
+		} catch (Exception e) {
+			Log.Error(e);
+			await Dialog.ShowOk(window, Title, "Could not vacuum database: " + e.Message);
+			return;
+		}
+		
+		await Dialog.ShowOk(window, Title, "Done.");
+	}
 }

app/Desktop/Main/Pages/DebugPage.axaml

@@ -16,6 +16,10 @@
             <Setter Property="FontFamily" Value="Consolas,Courier" />
             <Setter Property="FontSize" Value="15" />
         </Style>
+        <Style Selector="Label">
+            <Setter Property="Margin" Value="0 5" />
+            <Setter Property="Padding" Value="0" />
+        </Style>
         <Style Selector="WrapPanel > StackPanel">
             <Setter Property="Orientation" Value="Vertical" />
             <Setter Property="Margin" Value="0 0 10 10" />

app/Desktop/Main/Pages/DebugPageModel.cs

@@ -51,7 +51,7 @@ sealed class DebugPageModel {
 	
 	private async Task GenerateRandomData(int channelCount, int userCount, int messageCount, IProgressCallback callback) {
 		int batchCount = (messageCount + BatchSize - 1) / BatchSize;
-		await callback.Update("Adding messages in batches of " + BatchSize, 0, batchCount);
+		await callback.Update("Adding messages in batches of " + BatchSize, finishedItems: 0, totalItems: batchCount);
 		
 		var rand = new Random();
 		var server = new DHT.Server.Data.Server {
@@ -60,46 +60,46 @@ sealed class DebugPageModel {
 			Type = ServerType.Server,
 		};
 		
-		var channels = Enumerable.Range(0, channelCount).Select(i => new Channel {
+		Channel[] channels = Enumerable.Range(start: 0, channelCount).Select(i => new Channel {
 			Id = RandomId(rand),
 			Server = server.Id,
 			Name = RandomName("c"),
 			ParentId = null,
 			Position = i,
-			Topic = RandomText(rand, 10),
+			Topic = RandomText(rand, maxWords: 10),
 			Nsfw = rand.Next(4) == 0,
 		}).ToArray();
 		
-		var users = Enumerable.Range(0, userCount).Select(_ => new User {
+		User[] users = Enumerable.Range(start: 0, userCount).Select(_ => new User {
 			Id = RandomId(rand),
 			Name = RandomName("u"),
 			DisplayName = RandomName("u"),
 			AvatarUrl = null,
-			Discriminator = rand.Next(0, 9999).ToString(),
+			Discriminator = rand.Next(minValue: 0, maxValue: 9999).ToString(),
 		}).ToArray();
 		
 		await state.Db.Users.Add(users);
 		await state.Db.Servers.Add([server]);
 		await state.Db.Channels.Add(channels);
 		
-		var now = DateTimeOffset.Now;
+		DateTimeOffset now = DateTimeOffset.Now;
 		int batchIndex = 0;
 		
 		while (messageCount > 0) {
 			int hourOffset = batchIndex;
 			
-			var messages = Enumerable.Range(0, Math.Min(messageCount, BatchSize)).Select(i => {
+			Message[] messages = Enumerable.Range(start: 0, Math.Min(messageCount, BatchSize)).Select(i => {
 				DateTimeOffset time = now.AddHours(hourOffset).AddMinutes(i * 60.0 / BatchSize);
-				DateTimeOffset? edit = rand.Next(100) == 0 ? time.AddSeconds(rand.Next(1, 60)) : null;
+				DateTimeOffset? edit = rand.Next(100) == 0 ? time.AddSeconds(rand.Next(minValue: 1, maxValue: 60)) : null;
 				
-				var timeMillis = time.ToUnixTimeMilliseconds();
-				var editMillis = edit?.ToUnixTimeMilliseconds();
+				long timeMillis = time.ToUnixTimeMilliseconds();
+				long? editMillis = edit?.ToUnixTimeMilliseconds();
 				
 				return new Message {
 					Id = (ulong) timeMillis,
 					Sender = RandomBiasedIndex(rand, users).Id,
 					Channel = RandomBiasedIndex(rand, channels).Id,
-					Text = RandomText(rand, 100),
+					Text = RandomText(rand, maxWords: 100),
 					Timestamp = timeMillis,
 					EditTimestamp = editMillis,
 					RepliedToId = null,
@@ -153,12 +153,12 @@ sealed class DebugPageModel {
 		"vanilla",
 		"watercress", "watermelon",
 		"yam",
-		"zucchini"
+		"zucchini",
 	];
 	
 	private static string RandomText(Random rand, int maxWords) {
-		int wordCount = 1 + (int) Math.Floor(maxWords * Math.Pow(rand.NextDouble(), 3));
-		return string.Join(' ', Enumerable.Range(0, wordCount).Select(_ => RandomWords[rand.Next(RandomWords.Length)]));
+		int wordCount = 1 + (int) Math.Floor(maxWords * Math.Pow(rand.NextDouble(), y: 3));
+		return string.Join(separator: ' ', Enumerable.Range(start: 0, wordCount).Select(_ => RandomWords[rand.Next(RandomWords.Length)]));
 	}
 }
 #else

app/Desktop/Main/Pages/DownloadsPage.axaml

@@ -13,8 +13,8 @@
     </Design.DataContext>
 
     <UserControl.Styles>
-        <Style Selector="Expander">
-            <Setter Property="Margin" Value="0 5 0 0" />
+        <Style Selector="WrapPanel > Button">
+            <Setter Property="Margin" Value="0 0 10 10" />
         </Style>
         <Style Selector="DataGridColumnHeader">
             <Setter Property="FontWeight" Value="Medium" />
@@ -30,16 +30,18 @@
         </Style>
     </UserControl.Styles>
 
-    <StackPanel Orientation="Vertical" Spacing="20">
-        <StackPanel Orientation="Horizontal" Spacing="10">
+    <StackPanel Orientation="Vertical">
+        <WrapPanel Orientation="Horizontal">
             <Button Command="{Binding OnClickToggleDownload}" Content="{Binding ToggleDownloadButtonText}" IsEnabled="{Binding IsToggleDownloadButtonEnabled}" />
-            <Button Command="{Binding OnClickRetryFailedDownloads}" IsEnabled="{Binding IsRetryFailedOnDownloadsButtonEnabled}">Retry Failed Downloads</Button>
-        </StackPanel>
+            <Button Command="{Binding OnClickRetryFailed}" IsEnabled="{Binding IsRetryFailedOnDownloadsButtonEnabled}">Retry Failed</Button>
+            <Button Command="{Binding OnClickDeleteOrphaned}">Delete Orphaned</Button>
+            <Button Command="{Binding OnClickExportAll}" IsEnabled="{Binding HasSuccessfulDownloads}">Export All...</Button>
+        </WrapPanel>
+        <StackPanel Orientation="Vertical" Spacing="20" Margin="0 10 0 0">
             <controls:DownloadItemFilterPanel DataContext="{Binding FilterModel}" IsEnabled="{Binding !$parent[UserControl].((pages:DownloadsPageModel)DataContext).IsDownloading}" />
             <TextBlock TextWrapping="Wrap">
                 Downloading state and filter settings are remembered per-database.
             </TextBlock>
-        <StackPanel Orientation="Vertical" Spacing="12">
             <Expander Header="Download Status" IsExpanded="True">
                 <DataGrid ItemsSource="{Binding StatisticsRows}" AutoGenerateColumns="False" CanUserReorderColumns="False" CanUserResizeColumns="False" CanUserSortColumns="False" IsReadOnly="True">
                     <DataGrid.Columns>

app/Desktop/Main/Pages/DownloadsPageModel.cs

@@ -1,40 +1,51 @@
 using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.ComponentModel;
 using System.Reactive.Linq;
 using System.Threading.Tasks;
+using Avalonia.Controls;
+using Avalonia.Platform.Storage;
 using Avalonia.ReactiveUI;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
+using DHT.Desktop.Dialogs.File;
+using DHT.Desktop.Dialogs.Message;
+using DHT.Desktop.Dialogs.Progress;
 using DHT.Desktop.Main.Controls;
 using DHT.Server;
+using DHT.Server.Data;
 using DHT.Server.Data.Aggregations;
 using DHT.Server.Data.Filters;
 using DHT.Server.Data.Settings;
 using DHT.Server.Download;
 using DHT.Utils.Logging;
 using DHT.Utils.Tasks;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Pages;
 
-sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
+sealed partial class DownloadsPageModel : IAsyncDisposable {
 	private static readonly Log Log = Log.ForType<DownloadsPageModel>();
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private bool isToggleDownloadButtonEnabled = true;
 	
+	[DependsOn(nameof(IsDownloading))]
 	public string ToggleDownloadButtonText => IsDownloading ? "Stop Downloading" : "Start Downloading";
 	
-	[ObservableProperty(Setter = Access.Private)]
-	[NotifyPropertyChangedFor(nameof(IsRetryFailedOnDownloadsButtonEnabled))]
+	[Notify(Setter.Private)]
 	private bool isRetryingFailedDownloads = false;
 	
-	[ObservableProperty(Setter = Access.Private)]
-	[NotifyPropertyChangedFor(nameof(IsRetryFailedOnDownloadsButtonEnabled))]
+	[Notify(Setter.Private)]
+	private bool hasSuccessfulDownloads;
+	
+	[Notify(Setter.Private)]
 	private bool hasFailedDownloads;
 	
+	[DependsOn(nameof(IsRetryingFailedDownloads), nameof(HasFailedDownloads))]
 	public bool IsRetryFailedOnDownloadsButtonEnabled => !IsRetryingFailedDownloads && HasFailedDownloads;
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private string downloadMessage = "";
 	
 	public DownloadItemFilterPanelModel FilterModel { get; }
@@ -48,6 +59,7 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	
 	public bool IsDownloading => state.Downloader.IsDownloading;
 	
+	private readonly Window window;
 	private readonly State state;
 	private readonly ThrottledTask<DownloadStatusStatistics> downloadStatisticsTask;
 	private readonly IDisposable downloadItemCountSubscription;
@@ -55,9 +67,10 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	private IDisposable? finishedItemsSubscription;
 	private DownloadItemFilter? currentDownloadFilter;
 	
-	public DownloadsPageModel() : this(State.Dummy) {}
+	public DownloadsPageModel() : this(null!, State.Dummy) {}
 	
-	public DownloadsPageModel(State state) {
+	public DownloadsPageModel(Window window, State state) {
+		this.window = window;
 		this.state = state;
 		
 		FilterModel = new DownloadItemFilterPanelModel(state);
@@ -66,7 +79,7 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 			statisticsPending,
 			statisticsDownloaded,
 			statisticsFailed,
-			statisticsSkipped
+			statisticsSkipped,
 		];
 		
 		downloadStatisticsTask = new ThrottledTask<DownloadStatusStatistics>(Log, UpdateStatistics, TaskScheduler.FromCurrentSynchronizationContext());
@@ -78,7 +91,7 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	public async Task Initialize() {
 		await FilterModel.Initialize();
 		
-		if (await state.Db.Settings.Get(SettingsKey.DownloadsAutoStart, false)) {
+		if (await state.Db.Settings.Get(SettingsKey.DownloadsAutoStart, defaultValue: false)) {
 			await StartDownload();
 		}
 	}
@@ -113,7 +126,7 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	private async Task StartDownload() {
 		await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
 		
-		var finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
+		IObservable<DownloadItem> finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
 		finishedItemsSubscription = finishedItems.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnItemFinished);
 		
 		OnDownloadStateChanged();
@@ -133,15 +146,14 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	private void OnDownloadStateChanged() {
 		RecomputeDownloadStatistics();
 		
-		OnPropertyChanged(nameof(ToggleDownloadButtonText));
-		OnPropertyChanged(nameof(IsDownloading));
+		OnPropertyChanged(new PropertyChangedEventArgs(nameof(IsDownloading)));
 	}
 	
 	private void OnItemFinished(DownloadItem item) {
 		RecomputeDownloadStatistics();
 	}
 	
-	public async Task OnClickRetryFailedDownloads() {
+	public async Task OnClickRetryFailed() {
 		IsRetryingFailedDownloads = true;
 		
 		try {
@@ -158,6 +170,96 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 		downloadStatisticsTask.Post(cancellationToken => state.Db.Downloads.GetStatistics(currentDownloadFilter ?? new DownloadItemFilter(), cancellationToken));
 	}
 	
+	public async Task OnClickDeleteOrphaned() {
+		const string Title = "Delete Orphaned Downloads";
+		
+		try {
+			await ProgressDialog.Show(window, Title, async (_, callback) => {
+				await callback.UpdateIndeterminate("Searching for orphaned downloads...");
+				
+				HashSet<string> reachableNormalizedUrls = [];
+				HashSet<string> orphanedNormalizedUrls = [];
+				
+				await foreach (Download download in state.Db.Downloads.FindAllDownloadableUrls()) {
+					reachableNormalizedUrls.Add(download.NormalizedUrl);
+				}
+				
+				await foreach (Download download in state.Db.Downloads.Get()) {
+					string normalizedUrl = download.NormalizedUrl;
+					if (!reachableNormalizedUrls.Contains(normalizedUrl)) {
+						orphanedNormalizedUrls.Add(normalizedUrl);
+					}
+				}
+				
+				if (orphanedNormalizedUrls.Count == 0) {
+					await Dialog.ShowOk(window, Title, "No orphaned downloads found.");
+					return;
+				}
+				
+				if (await Dialog.ShowYesNo(window, Title, orphanedNormalizedUrls.Count + " orphaned download(s) will be removed from this database. This action cannot be undone. Proceed?") != DialogResult.YesNo.Yes) {
+					return;
+				}
+				
+				await callback.UpdateIndeterminate("Deleting orphaned downloads...");
+				await state.Db.Downloads.Remove(orphanedNormalizedUrls);
+				RecomputeDownloadStatistics();
+				
+				if (await Dialog.ShowYesNo(window, Title, "Orphaned downloads deleted. Vacuum database now to reclaim space?") != DialogResult.YesNo.Yes) {
+					return;
+				}
+				
+				await callback.UpdateIndeterminate("Vacuuming database...");
+				await state.Db.Vacuum();
+			});
+		} catch (Exception e) {
+			Log.Error(e);
+			await Dialog.ShowOk(window, Title, "Could not delete orphaned downloads: " + e.Message);
+		}
+	}
+	
+	public async Task OnClickExportAll() {
+		const string Title = "Export Downloaded Files";
+		
+		string[] folders = await window.StorageProvider.OpenFolders(new FolderPickerOpenOptions {
+			Title = Title,
+			AllowMultiple = false,
+		});
+		
+		if (folders.Length != 1) {
+			return;
+		}
+		
+		string folderPath = folders[0];
+		
+		DownloadExporter exporter = new DownloadExporter(state.Db, folderPath);
+		DownloadExporter.Result result;
+		try {
+			result = await ProgressDialog.Show(window, Title, async (_, callback) => {
+				await callback.UpdateIndeterminate("Exporting downloaded files...");
+				return await exporter.Export(new ExportProgressReporter(callback));
+			});
+		} catch (Exception e) {
+			Log.Error(e);
+			await Dialog.ShowOk(window, Title, "Could not export downloaded files: " + e.Message);
+			return;
+		}
+		
+		string messageStart = "Exported " + result.SuccessfulCount.Pluralize("file");
+		
+		if (result.FailedCount > 0L) {
+			await Dialog.ShowOk(window, Title, messageStart + " (" + result.FailedCount.Format() + " failed).");
+		}
+		else {
+			await Dialog.ShowOk(window, Title, messageStart + ".");
+		}
+	}
+	
+	private sealed class ExportProgressReporter(IProgressCallback callback) : DownloadExporter.IProgressReporter {
+		public Task ReportProgress(long processedCount, long totalCount) {
+			return callback.Update("Exporting downloaded files...", processedCount, totalCount);
+		}
+	}
+	
 	private void UpdateStatistics(DownloadStatusStatistics statusStatistics) {
 		statisticsPending.Items = statusStatistics.PendingCount;
 		statisticsPending.Size = statusStatistics.PendingTotalSize;
@@ -175,24 +277,23 @@ sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 		statisticsSkipped.Size = statusStatistics.SkippedTotalSize;
 		statisticsSkipped.HasFilesWithUnknownSize = statusStatistics.SkippedWithUnknownSizeCount > 0;
 		
+		HasSuccessfulDownloads = statusStatistics.SuccessfulCount > 0;
 		HasFailedDownloads = statusStatistics.FailedCount > 0;
 	}
 	
-	[ObservableObject]
 	public sealed partial class StatisticsRow(string state) {
 		public string State { get; } = state;
 		
-		[ObservableProperty]
+		[Notify]
 		private int items;
 		
-		[ObservableProperty]
-		[NotifyPropertyChangedFor(nameof(SizeText))]
+		[Notify]
 		private ulong? size;
 		
-		[ObservableProperty]
-		[NotifyPropertyChangedFor(nameof(SizeText))]
+		[Notify]
 		private bool hasFilesWithUnknownSize;
 		
+		[DependsOn(nameof(Size), nameof(HasFilesWithUnknownSize))]
 		public string SizeText {
 			get {
 				if (size == null) {

app/Desktop/Main/Pages/TrackingPage.axaml

@@ -13,13 +13,21 @@
 
     <StackPanel Spacing="10">
         <TextBlock TextWrapping="Wrap">
-            To start tracking messages, copy the tracking script and paste it into the console of either the Discord app, or your browser. The console is usually opened by pressing Ctrl+Shift+I.
+            <TextBlock.Text>
+                <MultiBinding StringFormat="To start tracking messages, copy the tracking script and paste it into the console of either the Discord app, or your browser. The console is usually opened by pressing {0}.">
+                    <Binding Path="OpenDevToolsShortcutText" />
+                </MultiBinding>
+            </TextBlock.Text>
         </TextBlock>
         <StackPanel DockPanel.Dock="Left" Orientation="Horizontal" Spacing="10">
             <Button x:Name="CopyTrackingScript" Click="CopyTrackingScriptButton_OnClick" IsEnabled="{Binding IsCopyTrackingScriptButtonEnabled}">Copy Tracking Script</Button>
         </StackPanel>
         <TextBlock TextWrapping="Wrap" Margin="0 5 0 0">
-            By default, the Discord app does not allow opening the console. The button below will change a hidden setting in the Discord app that controls whether the Ctrl+Shift+I shortcut is enabled.
+            <TextBlock.Text>
+                <MultiBinding StringFormat="By default, the Discord app does not allow opening the console. The button below will change a hidden setting in the Discord app that controls whether the {0} shortcut is enabled.">
+                    <Binding Path="OpenDevToolsShortcutText" />
+                </MultiBinding>
+            </TextBlock.Text>
         </TextBlock>
         <Button DockPanel.Dock="Right" Command="{Binding OnClickToggleAppDevTools}" Content="{Binding ToggleAppDevToolsButtonText}" IsEnabled="{Binding IsToggleAppDevToolsButtonEnabled}" />
     </StackPanel>

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

@@ -16,7 +16,7 @@ public sealed partial class TrackingPage : UserControl {
 	
 	public async void CopyTrackingScriptButton_OnClick(object? sender, RoutedEventArgs e) {
 		if (DataContext is TrackingPageModel model) {
-			var originalText = CopyTrackingScript.Content;
+			object? originalText = CopyTrackingScript.Content;
 			CopyTrackingScript.MinWidth = CopyTrackingScript.Bounds.Width;
 			
 			if (await model.OnClickCopyTrackingScript() && !isCopyingScript) {

app/Desktop/Main/Pages/TrackingPageModel.cs

@@ -3,26 +3,28 @@ using System.Threading;
 using System.Threading.Tasks;
 using System.Web;
 using Avalonia.Controls;
-using CommunityToolkit.Mvvm.ComponentModel;
+using Avalonia.Input.Platform;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Discord;
 using DHT.Desktop.Server;
+using PropertyChanged.SourceGenerator;
 using static DHT.Desktop.Program;
 
 namespace DHT.Desktop.Main.Pages;
 
-sealed partial class TrackingPageModel : ObservableObject {
-	[ObservableProperty(Setter = Access.Private)]
+sealed partial class TrackingPageModel {
+	[Notify(Setter.Private)]
 	private bool isCopyTrackingScriptButtonEnabled = true;
 	
-	[ObservableProperty(Setter = Access.Private)]
-	[NotifyPropertyChangedFor(nameof(ToggleAppDevToolsButtonText))]
+	[Notify(Setter.Private)]
 	private bool? areDevToolsEnabled = null;
 	
-	[ObservableProperty(Setter = Access.Private)]
-	[NotifyPropertyChangedFor(nameof(ToggleAppDevToolsButtonText))]
+	[Notify(Setter.Private)]
 	private bool isToggleAppDevToolsButtonEnabled = false;
 	
+	public string OpenDevToolsShortcutText { get; } = OperatingSystem.IsMacOS() ? "Cmd+Shift+I" : "Ctrl+Shift+I";
+	
+	[DependsOn(nameof(AreDevToolsEnabled), nameof(IsToggleAppDevToolsButtonEnabled))]
 	public string ToggleAppDevToolsButtonText {
 		get {
 			if (!AreDevToolsEnabled.HasValue) {
@@ -33,7 +35,7 @@ sealed partial class TrackingPageModel : ObservableObject {
 				return "Unavailable";
 			}
 			
-			return AreDevToolsEnabled.Value ? "Disable Ctrl+Shift+I" : "Enable Ctrl+Shift+I";
+			return (AreDevToolsEnabled.Value ? "Disable" : "Enable") + " " + OpenDevToolsShortcutText;
 		}
 	}
 	
@@ -62,7 +64,7 @@ sealed partial class TrackingPageModel : ObservableObject {
 		string url = $"http://127.0.0.1:{ServerConfiguration.Port}/get-tracking-script?token={HttpUtility.UrlEncode(ServerConfiguration.Token)}";
 		string script = (await Resources.ReadTextAsync("tracker-loader.js")).Trim().Replace("{url}", url);
 		
-		var clipboard = window.Clipboard;
+		IClipboard? clipboard = window.Clipboard;
 		if (clipboard == null) {
 			await Dialog.ShowOk(window, "Copy Tracking Script", "Clipboard is not available on this system.");
 			return false;
@@ -102,11 +104,11 @@ sealed partial class TrackingPageModel : ObservableObject {
 		switch (await DiscordAppSettings.ConfigureDevTools(newState)) {
 			case SettingsJsonResult.Success:
 				AreDevToolsEnabled = newState;
-				await Dialog.ShowOk(window, DialogTitle, "Ctrl+Shift+I was " + (newState ? "enabled." : "disabled.") + " Restart the Discord app for the change to take effect.");
+				await Dialog.ShowOk(window, DialogTitle, OpenDevToolsShortcutText + " was " + (newState ? "enabled." : "disabled.") + " Restart the Discord app for the change to take effect.");
 				break;
 			
 			case SettingsJsonResult.AlreadySet:
-				await Dialog.ShowOk(window, DialogTitle, "Ctrl+Shift+I is already " + (newState ? "enabled." : "disabled."));
+				await Dialog.ShowOk(window, DialogTitle, OpenDevToolsShortcutText + " is already " + (newState ? "enabled." : "disabled."));
 				AreDevToolsEnabled = newState;
 				break;
 			

app/Desktop/Main/Pages/ViewerPageModel.cs

@@ -3,7 +3,6 @@ using System.ComponentModel;
 using System.Threading.Tasks;
 using System.Web;
 using Avalonia.Controls;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Dialogs.Progress;
@@ -12,14 +11,18 @@ using DHT.Desktop.Server;
 using DHT.Server;
 using DHT.Server.Data.Filters;
 using DHT.Server.Service.Viewer;
+using DHT.Utils.Logging;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Pages;
 
-sealed partial class ViewerPageModel : ObservableObject, IDisposable {
+sealed partial class ViewerPageModel : IDisposable {
+	private static readonly Log Log = Log.ForType<ViewerPageModel>();
+	
 	public bool DatabaseToolFilterModeKeep { get; set; } = true;
 	public bool DatabaseToolFilterModeRemove { get; set; } = false;
 	
-	[ObservableProperty]
+	[Notify]
 	private bool hasFilters = false;
 	
 	public MessageFilterPanelModel FilterModel { get; }
@@ -58,8 +61,9 @@ sealed partial class ViewerPageModel : ObservableObject, IDisposable {
 	}
 	
 	public async Task OnClickApplyFiltersToDatabase() {
-		var filter = FilterModel.CreateFilter();
-		var messageCount = await ProgressDialog.ShowIndeterminate(window, "Apply Filters", "Counting matching messages...", _ => state.Db.Messages.Count(filter));
+		try {
+			MessageFilter filter = FilterModel.CreateFilter();
+			long messageCount = await ProgressDialog.ShowIndeterminate(window, "Apply Filters", "Counting matching messages...", _ => state.Db.Messages.Count(filter));
 			
 			if (DatabaseToolFilterModeKeep) {
 				if (DialogResult.YesNo.Yes == await Dialog.ShowYesNo(window, "Keep Matching Messages in This Database", messageCount.Pluralize("message") + " will be kept, and the rest will be removed from this database. This action cannot be undone. Proceed?")) {
@@ -71,9 +75,28 @@ sealed partial class ViewerPageModel : ObservableObject, IDisposable {
 					await ApplyFilterToDatabase(filter, FilterRemovalMode.RemoveMatching);
 				}
 			}
+		} catch (Exception e) {
+			Log.Error(e);
+			await Dialog.ShowOk(window, "Apply Filters", "Could not apply filters: " + e.Message);
+		}
 	}
 	
 	private async Task ApplyFilterToDatabase(MessageFilter filter, FilterRemovalMode removalMode) {
-		await ProgressDialog.ShowIndeterminate(window, "Apply Filters", "Removing messages...", _ => state.Db.Messages.Remove(filter, removalMode));
+		await ProgressDialog.Show(window, "Apply Filters", async (_, callback) => {
+			await callback.UpdateIndeterminate("Removing messages...");
+			Log.Info("Removed messages: " + await state.Db.Messages.Remove(filter, removalMode));
+			
+			await callback.UpdateIndeterminate("Cleaning up attachments...");
+			Log.Info("Removed orphaned attachments: " + await state.Db.Messages.RemoveUnreachableAttachments());
+			
+			await callback.UpdateIndeterminate("Cleaning up users...");
+			Log.Info("Removed orphaned users: " + await state.Db.Users.RemoveUnreachable());
+			
+			await callback.UpdateIndeterminate("Cleaning up channels...");
+			Log.Info("Removed orphaned channels: " + await state.Db.Channels.RemoveUnreachable());
+			
+			await callback.UpdateIndeterminate("Cleaning up servers...");
+			Log.Info("Removed orphaned servers: " + await state.Db.Servers.RemoveUnreachable());
+		});
 	}
 }

app/Desktop/Main/Screens/MainContentScreen.axaml

@@ -40,13 +40,13 @@
         <Style Selector="TabItem:pointerover /template/ Border">
             <Setter Property="Background" Value="#455785" />
         </Style>
-        <Style Selector="TabItem:pointerover > TextBlock">
+        <Style Selector="TabItem:pointerover /template/ ContentPresenter">
             <Setter Property="Foreground" Value="#E9E9E9" />
         </Style>
         <Style Selector="TabItem:selected:pointerover /template/ Border">
             <Setter Property="Background" Value="#FFFFFF" />
         </Style>
-        <Style Selector="TabItem:selected:pointerover > TextBlock">
+        <Style Selector="TabItem:selected:pointerover /template/ ContentPresenter">
             <Setter Property="Foreground" Value="#1A2234" />
         </Style>
         <Style Selector="TabItem:selected">
@@ -56,9 +56,11 @@
         <Style Selector="TabItem:selected /template/ Border#PART_SelectedPipe">
             <Setter Property="IsVisible" Value="False" />
         </Style>
-        <Style Selector="TabItem:disabled > TextBlock">
+        <Style Selector="TabItem:disabled /template/ ContentPresenter">
             <Setter Property="Foreground" Value="#B2B2B2" />
-            <Setter Property="TextDecorations" Value="Strikethrough" />
+        </Style>
+        <Style Selector="TabItem:disabled /template/ ContentPresenter">
+            <Setter Property="AccessText.TextDecorations" Value="Strikethrough" />
         </Style>
         <Style Selector="TabItem.first">
             <Setter Property="Margin" Value="0 13 0 0" />

app/Desktop/Main/Screens/MainContentScreenModel.cs

@@ -35,12 +35,8 @@ sealed class MainContentScreenModel : IAsyncDisposable {
 	public StatusBarModel StatusBarModel { get; }
 	
 	public event EventHandler? DatabaseClosed {
-		add {
-			DatabasePageModel.DatabaseClosed += value;
-		}
-		remove {
-			DatabasePageModel.DatabaseClosed -= value;
-		}
+		add => DatabasePageModel.DatabaseClosed += value;
+		remove => DatabasePageModel.DatabaseClosed -= value;
 	}
 	
 	[Obsolete("Designer")]
@@ -53,7 +49,7 @@ sealed class MainContentScreenModel : IAsyncDisposable {
 		TrackingPageModel = new TrackingPageModel(window);
 		TrackingPage = new TrackingPage { DataContext = TrackingPageModel };
 		
-		DownloadsPageModel = new DownloadsPageModel(state);
+		DownloadsPageModel = new DownloadsPageModel(window, state);
 		DownloadsPage = new DownloadsPage { DataContext = DownloadsPageModel };
 		
 		ViewerPageModel = new ViewerPageModel(window, state);

app/Desktop/Main/Screens/WelcomeScreenModel.cs

@@ -5,23 +5,24 @@ using System.Net;
 using System.Net.Http;
 using System.Threading.Tasks;
 using Avalonia.Controls;
-using CommunityToolkit.Mvvm.ComponentModel;
 using DHT.Desktop.Common;
 using DHT.Desktop.Dialogs.Message;
 using DHT.Desktop.Dialogs.Progress;
-using DHT.Server.Data.Settings;
+using DHT.Desktop.Main.Dialogs;
 using DHT.Server.Database;
 using DHT.Server.Database.Sqlite.Schema;
+using DHT.Server.Database.Sqlite.Utils;
 using DHT.Utils.Logging;
+using PropertyChanged.SourceGenerator;
 
 namespace DHT.Desktop.Main.Screens;
 
-sealed partial class WelcomeScreenModel : ObservableObject {
+sealed partial class WelcomeScreenModel {
 	private static readonly Log Log = Log.ForType<WelcomeScreenModel>();
 	
 	public string Version => Program.Version;
 	
-	[ObservableProperty(Setter = Access.Private)]
+	[Notify(Setter.Private)]
 	private bool isOpenOrCreateDatabaseButtonEnabled = true;
 	
 	public event EventHandler<IDatabaseFile>? DatabaseSelected;
@@ -40,7 +41,7 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 	public async Task OpenOrCreateDatabase() {
 		IsOpenOrCreateDatabaseButtonEnabled = false;
 		try {
-			var path = await DatabaseGui.NewOpenOrCreateDatabaseFileDialog(window, Path.GetDirectoryName(dbFilePath));
+			string? path = await DatabaseGui.NewOpenOrCreateDatabaseFileDialog(window, Path.GetDirectoryName(dbFilePath));
 			if (path != null) {
 				await OpenOrCreateDatabaseFromPath(path);
 			}
@@ -52,21 +53,22 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 	public async Task OpenOrCreateDatabaseFromPath(string path) {
 		dbFilePath = path;
 		
-		bool isNew = !File.Exists(path);
-
-		var db = await DatabaseGui.TryOpenOrCreateDatabaseFromPath(path, window, new SchemaUpgradeCallbacks(window));
-		if (db == null) {
-			return;
-		}
-
-		if (isNew && await Dialog.ShowYesNo(window, "Automatic Downloads", "Do you want to automatically download files hosted on Discord? You can change this later in the Downloads tab.") == DialogResult.YesNo.Yes) {
-			await db.Settings.Set(SettingsKey.DownloadsAutoStart, true);
-		}
-
+		IDatabaseFile? db = await DatabaseGui.TryOpenOrCreateDatabaseFromPath(path, window, new SchemaUpgradeCallbacks(window));
+		if (db != null) {
 			DatabaseSelected?.Invoke(this, db);
 		}
+	}
 	
 	private sealed class SchemaUpgradeCallbacks(Window window) : ISchemaUpgradeCallbacks {
+		public async Task<InitialDatabaseSettings?> GetInitialDatabaseSettings() {
+			var model = new NewDatabaseSettingsDialogModel();
+			
+			var dialog = new NewDatabaseSettingsDialog { DataContext = model };
+			await dialog.ShowDialog(window);
+			
+			return new InitialDatabaseSettings(model.SeparateFileForDownloads, model.DownloadsAutoStart);
+		}
+		
 		public async Task<bool> CanUpgrade() {
 			return DialogResult.YesNo.Yes == await DatabaseGui.ShowCanUpgradeDatabaseDialog(window);
 		}
@@ -110,38 +112,32 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 	}
 	
 	public async Task CheckUpdates() {
-		Version? latestVersion = await ProgressDialog.ShowIndeterminate<Version?>(window, "Check Updates", "Checking for updates...", async _ => {
+		string response;
+		try {
+			response = await ProgressDialog.ShowIndeterminate<string>(window, "Check Updates", "Checking for updates...", static async _ => {
 				var client = new HttpClient(new SocketsHttpHandler {
 					AutomaticDecompression = DecompressionMethods.None,
 					AllowAutoRedirect = false,
-				UseCookies = false
+					UseCookies = false,
 				});
 				
 				client.Timeout = TimeSpan.FromSeconds(30);
 				client.MaxResponseContentBufferSize = 1024;
 				client.DefaultRequestHeaders.UserAgent.ParseAdd("DiscordHistoryTracker/" + Program.Version);
 				
-			string response;
-			try {
-				response = await client.GetStringAsync(Program.Website + "/version");
+				return await client.GetStringAsync(Program.Website + "/version");
+			});
 		} catch (TaskCanceledException e) when (e.InnerException is TimeoutException) {
 			await Dialog.ShowOk(window, "Check Updates", "Request timed out.");
-				return null;
+			return;
 		} catch (Exception e) {
 			Log.Error(e);
 			await Dialog.ShowOk(window, "Check Updates", "Error checking for updates: " + e.Message);
-				return null;
+			return;
 		}
 		
-			if (!System.Version.TryParse(response, out var latestVersion)) {
+		if (!System.Version.TryParse(response, out Version? latestVersion)) {
 			await Dialog.ShowOk(window, "Check Updates", "Server returned an invalid response.");
-				return null;
-			}
-
-			return latestVersion;
-		});
-
-		if (latestVersion == null) {
 			return;
 		}
 		

app/Desktop/Program.cs

@@ -19,7 +19,7 @@ static class Program {
 	static Program() {
 		var assembly = Assembly.GetExecutingAssembly();
 		
-		AssemblyVersion = assembly.GetName().Version ?? new Version(0, 0, 0, 0);
+		AssemblyVersion = assembly.GetName().Version ?? new Version(major: 0, minor: 0, build: 0, revision: 0);
 		Version = VersionToString(AssemblyVersion);
 		
 		Culture = CultureInfo.CurrentCulture;

app/Desktop/Server/ServerConfiguration.cs

@@ -3,6 +3,6 @@ using DHT.Server.Service;
 namespace DHT.Desktop.Server;
 
 static class ServerConfiguration {
-	public static ushort Port { get; set; } = ServerUtils.FindAvailablePort(50000, 60000);
+	public static ushort Port { get; set; } = ServerUtils.FindAvailablePort(min: 50000, max: 60000);
 	public static string Token { get; set; } = ServerUtils.GenerateRandomToken(20);
 }

app/Directory.Build.props

@@ -1,8 +1,8 @@
 <Project>
   
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
-    <LangVersion>12</LangVersion>
+    <TargetFramework>net9.0</TargetFramework>
+    <LangVersion>13</LangVersion>
     <Nullable>enable</Nullable>
   </PropertyGroup>
   
@@ -21,12 +21,13 @@
   <PropertyGroup>
     <SuppressTrimAnalysisWarnings>false</SuppressTrimAnalysisWarnings>
     <PublishTrimmed>true</PublishTrimmed>
-    <TrimMode>partial</TrimMode>
+    <TrimMode>full</TrimMode>
     <EnableUnsafeBinaryFormatterSerialization>false</EnableUnsafeBinaryFormatterSerialization>
     <EnableUnsafeUTF7Encoding>false</EnableUnsafeUTF7Encoding>
     <EventSourceSupport>false</EventSourceSupport>
     <HttpActivityPropagationSupport>false</HttpActivityPropagationSupport>
     <JsonSerializerIsReflectionEnabledByDefault>false</JsonSerializerIsReflectionEnabledByDefault>
+    <XmlResolverIsNetworkingEnabledByDefault>false</XmlResolverIsNetworkingEnabledByDefault>
   </PropertyGroup>
   
   <PropertyGroup>
@@ -39,6 +40,7 @@
   <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
     <DebugSymbols>false</DebugSymbols>
     <DebugType>none</DebugType>
+    <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
   </PropertyGroup>
   
   <PropertyGroup>

app/Resources/Viewer/styles/messages.css

@@ -1,7 +1,7 @@
 #messages {
   flex: 1 1 0;
   overflow-y: auto;
-  background-color: #36393E;
+  background-color: #36393e;
 }
 
 #messages > div {
@@ -38,7 +38,7 @@
 }
 
 #messages .username {
-  color: #FFF;
+  color: #fff;
   font-size: 15px;
   font-weight: 600;
   margin-right: 3px;
@@ -75,12 +75,12 @@
 }
 
 .message .link, .reply-message .link {
-  color: #7289DA;
+  color: #7289da;
   background-color: rgba(115, 139, 215, 0.1);
 }
 
 .message a, .reply-message a {
-  color: #0096CF;
+  color: #0096cf;
   text-decoration: none;
 }
 
@@ -131,7 +131,7 @@
 }
 
 .message code {
-  background-color: #2E3136;
+  background-color: #2e3136;
   border-radius: 5px;
   font-family: Menlo, Consolas, Monaco, monospace;
   font-size: 14px;
@@ -144,7 +144,7 @@
 
 .message code.block {
   display: block;
-  border: 2px solid #282B30;
+  border: 2px solid #282b30;
   margin-top: 6px;
   padding: 7px;
 }
@@ -198,7 +198,7 @@
 }
 
 .reply-username {
-  color: #FFF;
+  color: #fff;
   font-size: 12px;
   font-weight: 600;
   letter-spacing: 0;
@@ -218,7 +218,7 @@
 }
 
 .reply-contents code {
-  background-color: #2E3136;
+  background-color: #2e3136;
   font-family: Menlo, Consolas, Monaco, monospace;
   padding: 1px 2px;
 }

app/Server/Data/DownloadStatus.cs

@@ -10,5 +10,5 @@ public enum DownloadStatus {
 	GenericError = 1,
 	Downloading = 2,
 	LastCustomCode = 99,
-	Success = HttpStatusCode.OK
+	Success = HttpStatusCode.OK,
 }

app/Server/Data/EmojiFlags.cs

@@ -5,5 +5,5 @@ namespace DHT.Server.Data;
 [Flags]
 public enum EmojiFlags : ushort {
 	None = 0,
-	Animated = 0b1
+	Animated = 0b1,
 }

app/Server/Data/Filters/FilterRemovalMode.cs

@@ -2,5 +2,5 @@ namespace DHT.Server.Data.Filters;
 
 public enum FilterRemovalMode {
 	KeepMatching,
-	RemoveMatching
+	RemoveMatching,
 }

app/Server/Data/ServerType.cs

@@ -3,7 +3,7 @@ namespace DHT.Server.Data;
 public enum ServerType {
 	Server,
 	Group,
-	DirectMessage
+	DirectMessage,
 }
 
 public static class ServerTypes {
@@ -12,7 +12,7 @@ public static class ServerTypes {
 			"SERVER" => ServerType.Server,
 			"GROUP"  => ServerType.Group,
 			"DM"     => ServerType.DirectMessage,
-			_        => null
+			_        => null,
 		};
 	}
 	
@@ -21,7 +21,7 @@ public static class ServerTypes {
 			ServerType.Server        => "SERVER",
 			ServerType.Group         => "GROUP",
 			ServerType.DirectMessage => "DM",
-			_                        => "UNKNOWN"
+			_                        => "UNKNOWN",
 		};
 	}
 	
@@ -30,7 +30,7 @@ public static class ServerTypes {
 			ServerType.Server        => "Server",
 			ServerType.Group         => "Group",
 			ServerType.DirectMessage => "DM",
-			_                        => "Unknown"
+			_                        => "Unknown",
 		};
 	}
 	
@@ -39,7 +39,7 @@ public static class ServerTypes {
 			ServerType.Server        => "server",
 			ServerType.Group         => "group",
 			ServerType.DirectMessage => "user",
-			_                        => "unknown"
+			_                        => "unknown",
 		};
 	}
 }

app/Server/Data/Settings/SettingsKey.cs

@@ -3,6 +3,7 @@ using System.Diagnostics.CodeAnalysis;
 namespace DHT.Server.Data.Settings;
 
 public static class SettingsKey {
+	public static Bool SeparateFileForDownloads { get; } = new ("separate_file_for_downloads");
 	public static Bool DownloadsAutoStart { get; } = new ("downloads_auto_start");
 	public static Bool DownloadsLimitSize { get; } = new ("downloads_limit_size");
 	public static UnsignedLong DownloadsMaximumSize { get; } = new ("downloads_maximum_size");

app/Server/Database/DatabaseExtensions.cs

@@ -14,7 +14,7 @@ public static class DatabaseExtensions {
 		const int MessageBatchSize = 100;
 		List<Message> batchedMessages = new (MessageBatchSize);
 		
-		await foreach (var message in source.Messages.Get()) {
+		await foreach (Message message in source.Messages.Get()) {
 			batchedMessages.Add(message);
 			
 			if (batchedMessages.Count >= MessageBatchSize) {
@@ -25,7 +25,7 @@ public static class DatabaseExtensions {
 		
 		await target.Messages.Add(batchedMessages);
 		
-		await foreach (var download in source.Downloads.Get()) {
+		await foreach (Data.Download download in source.Downloads.Get()) {
 			if (download.Status != DownloadStatus.Success || !await source.Downloads.GetDownloadData(download.NormalizedUrl, stream => target.Downloads.AddDownload(download, stream))) {
 				await target.Downloads.AddDownload(download, stream: null);
 			}

app/Server/Database/Export/SnowflakeJsonSerializer.cs

@@ -1,16 +1,20 @@
 using System;
+using System.Buffers.Text;
+using System.Diagnostics;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
 namespace DHT.Server.Database.Export;
 
 sealed class SnowflakeJsonSerializer : JsonConverter<Snowflake> {
+	private const int MaxUlongStringLength = 20;
+	
 	public override Snowflake Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) {
 		return new Snowflake(ulong.Parse(reader.GetString()!));
 	}
 	
 	public override void Write(Utf8JsonWriter writer, Snowflake value, JsonSerializerOptions options) {
-		writer.WriteStringValue(value.Id.ToString());
+		writer.WriteStringValue(Format(value, stackalloc byte[MaxUlongStringLength]));
 	}
 	
 	public override Snowflake ReadAsPropertyName(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) {
@@ -18,6 +22,14 @@ sealed class SnowflakeJsonSerializer : JsonConverter<Snowflake> {
 	}
 	
 	public override void WriteAsPropertyName(Utf8JsonWriter writer, Snowflake value, JsonSerializerOptions options) {
-		writer.WritePropertyName(value.Id.ToString());
+		writer.WritePropertyName(Format(value, stackalloc byte[MaxUlongStringLength]));
+	}
+	
+	private static ReadOnlySpan<byte> Format(Snowflake value, Span<byte> destination) {
+		if (!Utf8Formatter.TryFormat(value.Id, destination, out int bytesWritten)) {
+			Debug.Fail("Failed to format Snowflake value.");
+		}
+		
+		return destination[..bytesWritten];
 	}
 }

app/Server/Database/Export/ViewerJson.cs

@@ -30,7 +30,7 @@ static class ViewerJson {
 		public required string Name { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-		public string? Parent { get; init; }
+		public Snowflake? Parent { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
 		public int? Position { get; init; }
@@ -55,7 +55,7 @@ static class ViewerJson {
 		public long? Te { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-		public string? R { get; init; }
+		public Snowflake? R { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
 		public JsonMessageAttachment[]? A { get; init; }
@@ -80,7 +80,7 @@ static class ViewerJson {
 	
 	public sealed class JsonMessageReaction {
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-		public string? Id { get; init; }
+		public Snowflake? Id { get; init; }
 		
 		[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
 		public string? N { get; init; }

app/Server/Database/Export/ViewerJsonExport.cs

@@ -2,13 +2,15 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Runtime.CompilerServices;
 using System.Text.Json;
 using System.Threading;
+using System.Threading.Channels;
 using System.Threading.Tasks;
 using DHT.Server.Data;
 using DHT.Server.Data.Filters;
 using DHT.Utils.Logging;
+using Channel = System.Threading.Channels.Channel;
+using DiscordChannel = DHT.Server.Data.Channel;
 
 namespace DHT.Server.Database.Export;
 
@@ -16,28 +18,28 @@ static class ViewerJsonExport {
 	private static readonly Log Log = Log.ForType(typeof(ViewerJsonExport));
 	
 	public static async Task GetMetadata(Stream stream, IDatabaseFile db, MessageFilter? filter = null, CancellationToken cancellationToken = default) {
-		var perf = Log.Start();
+		Perf perf = Log.Start();
 		
-		var includedChannels = new List<Channel>();
+		var includedChannels = new List<DiscordChannel>();
 		var includedServerIds = new HashSet<ulong>();
 		
-		var channelIdFilter = filter?.ChannelIds;
+		HashSet<ulong>? channelIdFilter = filter?.ChannelIds;
 		
-		await foreach (var channel in db.Channels.Get(cancellationToken)) {
+		await foreach (DiscordChannel channel in db.Channels.Get(cancellationToken)) {
 			if (channelIdFilter == null || channelIdFilter.Contains(channel.Id)) {
 				includedChannels.Add(channel);
 				includedServerIds.Add(channel.Server);
 			}
 		}
 		
-		var users = await GenerateUserList(db, cancellationToken);
-		var servers = await GenerateServerList(db, includedServerIds, cancellationToken);
-		var channels = GenerateChannelList(includedChannels);
+		Dictionary<Snowflake, ViewerJson.JsonUser> users = await GenerateUserList(db, cancellationToken);
+		Dictionary<Snowflake, ViewerJson.JsonServer> servers = await GenerateServerList(db, includedServerIds, cancellationToken);
+		Dictionary<Snowflake, ViewerJson.JsonChannel> channels = GenerateChannelList(includedChannels);
 		
 		var meta = new ViewerJson.JsonMeta {
 			Users = users,
 			Servers = servers,
-			Channels = channels
+			Channels = channels,
 		};
 		
 		perf.Step("Collect database data");
@@ -49,15 +51,34 @@ static class ViewerJsonExport {
 	}
 	
 	public static async Task GetMessages(Stream stream, IDatabaseFile db, MessageFilter? filter = null, CancellationToken cancellationToken = default) {
-		var perf = Log.Start();
+		Perf perf = Log.Start();
 		
 		ReadOnlyMemory<byte> newLine = "\n"u8.ToArray();
 		
-		await foreach(var message in GenerateMessageList(db, filter, cancellationToken)) {
-			await JsonSerializer.SerializeAsync(stream, message, ViewerJsonMessageContext.Default.JsonMessage, cancellationToken);
+		Channel<Message> channel = Channel.CreateBounded<Message>(new BoundedChannelOptions(32) {
+			SingleWriter = true,
+			SingleReader = true,
+			AllowSynchronousContinuations = true,
+			FullMode = BoundedChannelFullMode.Wait,
+		});
+		
+		Task writerTask = Task.Run(async () => {
+			try {
+				await foreach (Message message in db.Messages.Get(filter, cancellationToken)) {
+					await channel.Writer.WriteAsync(message, cancellationToken);
+				}
+			} finally {
+				channel.Writer.Complete();
+			}
+		}, cancellationToken);
+		
+		await foreach (Message message in channel.Reader.ReadAllAsync(cancellationToken)) {
+			await JsonSerializer.SerializeAsync(stream, ToJsonMessage(message), ViewerJsonMessageContext.Default.JsonMessage, cancellationToken);
 			await stream.WriteAsync(newLine, cancellationToken);
 		}
 		
+		await writerTask;
+		
 		perf.Step("Generate and serialize messages to JSON");
 		perf.End();
 	}
@@ -65,7 +86,7 @@ static class ViewerJsonExport {
 	private static async Task<Dictionary<Snowflake, ViewerJson.JsonUser>> GenerateUserList(IDatabaseFile db, CancellationToken cancellationToken) {
 		var users = new Dictionary<Snowflake, ViewerJson.JsonUser>();
 		
-		await foreach (var user in db.Users.Get(cancellationToken)) {
+		await foreach (User user in db.Users.Get(cancellationToken)) {
 			users[user.Id] = new ViewerJson.JsonUser {
 				Name = user.Name,
 				DisplayName = user.DisplayName,
@@ -79,52 +100,51 @@ static class ViewerJsonExport {
 	private static async Task<Dictionary<Snowflake, ViewerJson.JsonServer>> GenerateServerList(IDatabaseFile db, HashSet<ulong> serverIds, CancellationToken cancellationToken) {
 		var servers = new Dictionary<Snowflake, ViewerJson.JsonServer>();
 		
-		await foreach (var server in db.Servers.Get(cancellationToken)) {
+		await foreach (Data.Server server in db.Servers.Get(cancellationToken)) {
 			if (!serverIds.Contains(server.Id)) {
 				continue;
 			}
 			
 			servers[server.Id] = new ViewerJson.JsonServer {
 				Name = server.Name,
-				Type = ServerTypes.ToJsonViewerString(server.Type)
+				Type = ServerTypes.ToJsonViewerString(server.Type),
 			};
 		}
 		
 		return servers;
 	}
 	
-	private static Dictionary<Snowflake, ViewerJson.JsonChannel> GenerateChannelList(List<Channel> includedChannels) {
+	private static Dictionary<Snowflake, ViewerJson.JsonChannel> GenerateChannelList(List<DiscordChannel> includedChannels) {
 		var channels = new Dictionary<Snowflake, ViewerJson.JsonChannel>();
 		
-		foreach (var channel in includedChannels) {
+		foreach (DiscordChannel channel in includedChannels) {
 			channels[channel.Id] = new ViewerJson.JsonChannel {
 				Server = channel.Server,
 				Name = channel.Name,
-				Parent = channel.ParentId?.ToString(),
+				Parent = channel.ParentId,
 				Position = channel.Position,
 				Topic = channel.Topic,
-				Nsfw = channel.Nsfw
+				Nsfw = channel.Nsfw,
 			};
 		}
 		
 		return channels;
 	}
 	
-	private static async IAsyncEnumerable<ViewerJson.JsonMessage> GenerateMessageList(IDatabaseFile db, MessageFilter? filter, [EnumeratorCancellation] CancellationToken cancellationToken) {
-		await foreach (var message in db.Messages.Get(filter, cancellationToken)) {
-			yield return new ViewerJson.JsonMessage {
+	private static ViewerJson.JsonMessage ToJsonMessage(Message message) {
+		return new ViewerJson.JsonMessage {
 			Id = message.Id,
 			C = message.Channel,
 			U = message.Sender,
 			T = message.Timestamp,
 			M = string.IsNullOrEmpty(message.Text) ? null : message.Text,
 			Te = message.EditTimestamp,
-				R = message.RepliedToId?.ToString(),
+			R = message.RepliedToId,
 			
 			A = message.Attachments.IsEmpty ? null : message.Attachments.Select(static attachment => {
 				var a = new ViewerJson.JsonMessageAttachment {
 					Url = attachment.DownloadUrl,
-						Name = Uri.TryCreate(attachment.NormalizedUrl, UriKind.Absolute, out var uri) ? Path.GetFileName(uri.LocalPath) : attachment.NormalizedUrl
+					Name = Uri.TryCreate(attachment.NormalizedUrl, UriKind.Absolute, out Uri? uri) ? Path.GetFileName(uri.LocalPath) : attachment.NormalizedUrl,
 				};
 				
 				if (attachment is { Width: not null, Height: not null }) {
@@ -138,12 +158,11 @@ static class ViewerJsonExport {
 			E = message.Embeds.IsEmpty ? null : message.Embeds.Select(static embed => embed.Json).ToArray(),
 			
 			Re = message.Reactions.IsEmpty ? null : message.Reactions.Select(static reaction => new ViewerJson.JsonMessageReaction {
-					Id = reaction.EmojiId?.ToString(),
+				Id = reaction.EmojiId,
 				N = reaction.EmojiName,
 				A = reaction.EmojiFlags.HasFlag(EmojiFlags.Animated),
-					C = reaction.Count
-				}).ToArray()
+				C = reaction.Count,
+			}).ToArray(),
 		};
 	}
 }
-}

app/Server/Database/Import/FakeSnowflake.cs

@@ -11,7 +11,7 @@ public sealed class FakeSnowflake {
 	private ulong id;
 	
 	public FakeSnowflake() {
-		var unixMillis = (ulong) (DateTime.UtcNow.Subtract(DateTime.UnixEpoch).Ticks / TimeSpan.TicksPerMillisecond);
+		ulong unixMillis = (ulong) (DateTime.UtcNow.Subtract(DateTime.UnixEpoch).Ticks / TimeSpan.TicksPerMillisecond);
 		this.id = (unixMillis - DiscordEpoch) << 22;
 	}
 	

app/Server/Database/Import/LegacyArchiveImport.cs

@@ -20,24 +20,24 @@ public static class LegacyArchiveImport {
 	private static readonly FileExtensionContentTypeProvider ContentTypeProvider = new ();
 	
 	public static async Task<bool> Read(Stream stream, IDatabaseFile db, FakeSnowflake fakeSnowflake, Func<Data.Server[], Task<Dictionary<Data.Server, ulong>?>> askForServerIds) {
-		var perf = Log.Start();
-		var root = await JsonSerializer.DeserializeAsync(stream, JsonElementContext.Default.JsonElement);
+		Perf perf = Log.Start();
+		JsonElement root = await JsonSerializer.DeserializeAsync(stream, JsonElementContext.Default.JsonElement);
 		
 		try {
-			var meta = root.RequireObject("meta");
-			var data = root.RequireObject("data");
+			JsonElement meta = root.RequireObject("meta");
+			JsonElement data = root.RequireObject("data");
 			
 			perf.Step("Deserialize JSON");
 			
-			var users = ReadUserList(meta);
-			var servers = ReadServerList(meta, fakeSnowflake);
+			User[] users = ReadUserList(meta);
+			Data.Server[] servers = ReadServerList(meta, fakeSnowflake);
 			
 			var newServersOnly = new HashSet<Data.Server>(servers);
-			var oldServersById = await db.Servers.Get().ToDictionaryAsync(static server => server.Id, static server => server);
-			var oldChannelsById = await db.Channels.Get().ToDictionaryAsync(static channel => channel.Id, static channel => channel);
+			Dictionary<ulong, Data.Server> oldServersById = await db.Servers.Get().ToDictionaryAsync(static server => server.Id, static server => server);
+			Dictionary<ulong, Channel> oldChannelsById = await db.Channels.Get().ToDictionaryAsync(static channel => channel.Id, static channel => channel);
 			
-			foreach (var (channelId, serverIndex) in ReadChannelToServerIndexMapping(meta, servers)) {
-				if (oldChannelsById.TryGetValue(channelId, out var oldChannel) && oldServersById.TryGetValue(oldChannel.Server, out var oldServer) && newServersOnly.Remove(servers[serverIndex])) {
+			foreach ((ulong channelId, int serverIndex) in ReadChannelToServerIndexMapping(meta, servers)) {
+				if (oldChannelsById.TryGetValue(channelId, out Channel oldChannel) && oldServersById.TryGetValue(oldChannel.Server, out Data.Server oldServer) && newServersOnly.Remove(servers[serverIndex])) {
 					servers[serverIndex] = oldServer;
 				}
 			}
@@ -45,27 +45,27 @@ public static class LegacyArchiveImport {
 			perf.Step("Read server and user list");
 			
 			if (newServersOnly.Count > 0) {
-				var askedServerIds = await askForServerIds(newServersOnly.ToArray());
+				Dictionary<Data.Server, ulong>? askedServerIds = await askForServerIds(newServersOnly.ToArray());
 				if (askedServerIds == null) {
 					return false;
 				}
 				
 				perf.Step("Ask for server IDs");
 				
-				for (var i = 0; i < servers.Length; i++) {
-					var server = servers[i];
-					if (askedServerIds.TryGetValue(server, out var serverId)) {
+				for (int i = 0; i < servers.Length; i++) {
+					Data.Server server = servers[i];
+					if (askedServerIds.TryGetValue(server, out ulong serverId)) {
 						servers[i] = server with { Id = serverId };
 					}
 				}
 			}
 			
-			var channels = ReadChannelList(meta, servers);
+			Channel[] channels = ReadChannelList(meta, servers);
 			
 			perf.Step("Read channel list");
 			
-			var oldMessageIds = await db.Messages.GetIds().ToHashSetAsync();
-			var newMessages = channels.SelectMany(channel => ReadMessages(data, channel, users, fakeSnowflake))
+			HashSet<ulong> oldMessageIds = await db.Messages.GetIds().ToHashSetAsync();
+			Message[] newMessages = channels.SelectMany(channel => ReadMessages(data, channel, users, fakeSnowflake))
 			                                .Where(message => !oldMessageIds.Contains(message.Id))
 			                                .ToArray();
 			
@@ -92,16 +92,16 @@ public static class LegacyArchiveImport {
 			return ulong.Parse(element.GetString() ?? throw new JsonException("Expected key 'meta.userindex[" + index + "]' to be a string."));
 		}
 		
-		var userindex = meta.RequireArray("userindex", "meta")
+		Dictionary<ulong, int> userindex = meta.RequireArray("userindex", "meta")
 		                                       .Select(static (item, index) => (ParseUserIndex(item, index), index))
 		                                       .ToDictionary();
 		
 		var users = new User[userindex.Count];
 		
-		foreach (var item in meta.RequireObject("users", "meta").EnumerateObject()) {
-			var path = UsersPath + "." + item.Name;
-			var userId = ulong.Parse(item.Name);
-			var userObj = item.Value;
+		foreach (JsonProperty item in meta.RequireObject("users", "meta").EnumerateObject()) {
+			string path = UsersPath + "." + item.Name;
+			ulong userId = ulong.Parse(item.Name);
+			JsonElement userObj = item.Value;
 			
 			users[userindex[userId]] = new User {
 				Id = userId,
@@ -128,9 +128,9 @@ public static class LegacyArchiveImport {
 	
 	private static Dictionary<ulong, int> ReadChannelToServerIndexMapping(JsonElement meta, Data.Server[] servers) {
 		return meta.RequireObject("channels", "meta").EnumerateObject().Select(item => {
-			var path = ChannelsPath + "." + item.Name;
-			var channelId = ulong.Parse(item.Name);
-			var channelObj = item.Value;
+			string path = ChannelsPath + "." + item.Name;
+			ulong channelId = ulong.Parse(item.Name);
+			JsonElement channelObj = item.Value;
 			
 			return (channelId, channelObj.RequireInt("server", path, min: 0, max: servers.Length - 1));
 		}).ToDictionary();
@@ -138,13 +138,13 @@ public static class LegacyArchiveImport {
 	
 	private static Channel[] ReadChannelList(JsonElement meta, Data.Server[] servers) {
 		return meta.RequireObject("channels", "meta").EnumerateObject().Select(item => {
-			var path = ChannelsPath + "." + item.Name;
-			var channelId = ulong.Parse(item.Name);
-			var channelObj = item.Value;
+			string path = ChannelsPath + "." + item.Name;
+			ulong channelId = ulong.Parse(item.Name);
+			JsonElement channelObj = item.Value;
 			
 			return new Channel {
 				Id = channelId,
-				Server = servers[channelObj.RequireInt("server", path, min: 0, max: servers.Length - 1)].Id,
+				Server = servers[channelObj.RequireInt("server", path, min: 0, servers.Length - 1)].Id,
 				Name = channelObj.RequireString("name", path),
 				Position = channelObj.HasKey("position") ? channelObj.RequireInt("position", path, min: 0) : null,
 				Topic = channelObj.HasKey("topic") ? channelObj.RequireString("topic", path) : null,
@@ -156,18 +156,18 @@ public static class LegacyArchiveImport {
 	private static Message[] ReadMessages(JsonElement data, Channel channel, User[] users, FakeSnowflake fakeSnowflake) {
 		const string DataPath = "data";
 		
-		var channelId = channel.Id;
-		var channelIdStr = channelId.ToString();
+		ulong channelId = channel.Id;
+		string channelIdStr = channelId.ToString();
 		
-		var messagesObj = data.HasKey(channelIdStr) ? data.RequireObject(channelIdStr, DataPath) : (JsonElement?) null;
+		JsonElement? messagesObj = data.HasKey(channelIdStr) ? data.RequireObject(channelIdStr, DataPath) : null;
 		if (messagesObj == null) {
 			return [];
 		}
 		
 		return messagesObj.Value.EnumerateObject().Select(item => {
-			var path = DataPath + "." + item.Name;
-			var messageId = ulong.Parse(item.Name);
-			var messageObj = item.Value;
+			string path = DataPath + "." + item.Name;
+			ulong messageId = ulong.Parse(item.Name);
+			JsonElement messageObj = item.Value;
 			
 			return new Message {
 				Id = messageId,
@@ -189,7 +189,7 @@ public static class LegacyArchiveImport {
 		return attachmentsArray.Select(attachmentObj => {
 			string url = attachmentObj.RequireString("url", path);
 			string name = url[(url.LastIndexOf('/') + 1)..];
-			string? type = ContentTypeProvider.TryGetContentType(name, out var contentType) ? contentType : null;
+			string? type = ContentTypeProvider.TryGetContentType(name, out string? contentType) ? contentType : null;
 			
 			return new Attachment {
 				Id = fakeSnowflake.Next(),
@@ -216,19 +216,19 @@ public static class LegacyArchiveImport {
 				Type = type,
 				Title = type == "rich" && embedObj.HasKey("t") ? embedObj.RequireString("t", path) : null,
 				Description = type == "rich" && embedObj.HasKey("d") ? embedObj.RequireString("d", path) : null,
-				Image = type == "image" ? new DiscordEmbedLegacyJson.ImageJson { Url = url } : null
+				Image = type == "image" ? new DiscordEmbedLegacyJson.ImageJson { Url = url } : null,
 			};
 			
 			return new Embed {
-				Json = JsonSerializer.Serialize(embed, DiscordEmbedLegacyJsonContext.Default.DiscordEmbedLegacyJson)
+				Json = JsonSerializer.Serialize(embed, DiscordEmbedLegacyJsonContext.Default.DiscordEmbedLegacyJson),
 			};
 		});
 	}
 	
 	private static IEnumerable<Reaction> ReadMessageReactions(JsonElement.ArrayEnumerator reactionsArray, string path) {
 		return reactionsArray.Select(reactionObj => {
-			var id = reactionObj.HasKey("id") ? reactionObj.RequireSnowflake("id", path) : (ulong?) null;
-			var name = reactionObj.HasKey("n") ? reactionObj.RequireString("n", path) : null;
+			ulong? id = reactionObj.HasKey("id") ? reactionObj.RequireSnowflake("id", path) : (ulong?) null;
+			string? name = reactionObj.HasKey("n") ? reactionObj.RequireString("n", path) : null;
 			
 			if (id == null && name == null) {
 				throw new JsonException("Expected key '" + path + ".id' and/or '" + path + ".n' to be present.");

app/Server/Database/Repositories/IChannelRepository.cs

@@ -17,6 +17,8 @@ public interface IChannelRepository {
 	
 	IAsyncEnumerable<Channel> Get(CancellationToken cancellationToken = default);
 	
+	Task<int> RemoveUnreachable();
+	
 	internal sealed class Dummy : IChannelRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
 		
@@ -31,5 +33,9 @@ public interface IChannelRepository {
 		public IAsyncEnumerable<Channel> Get(CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<Channel>();
 		}
+		
+		public Task<int> RemoveUnreachable() {
+			return Task.FromResult(0);
+		}
 	}
 }

app/Server/Database/Repositories/IDownloadRepository.cs

@@ -20,7 +20,7 @@ public interface IDownloadRepository {
 	
 	Task<DownloadStatusStatistics> GetStatistics(DownloadItemFilter nonSkippedFilter, CancellationToken cancellationToken = default);
 	
-	IAsyncEnumerable<Data.Download> Get();
+	IAsyncEnumerable<Data.Download> Get(DownloadItemFilter? filter = null);
 	
 	Task<bool> GetDownloadData(string normalizedUrl, Func<Stream, Task> dataProcessor);
 	
@@ -32,6 +32,10 @@ public interface IDownloadRepository {
 	
 	Task<int> RetryFailed(CancellationToken cancellationToken = default);
 	
+	Task Remove(ICollection<string> normalizedUrls);
+	
+	IAsyncEnumerable<Data.Download> FindAllDownloadableUrls(CancellationToken cancellationToken = default);
+	
 	internal sealed class Dummy : IDownloadRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
 		
@@ -47,7 +51,7 @@ public interface IDownloadRepository {
 			return Task.FromResult(new DownloadStatusStatistics());
 		}
 		
-		public IAsyncEnumerable<Data.Download> Get() {
+		public IAsyncEnumerable<Data.Download> Get(DownloadItemFilter? filter) {
 			return AsyncEnumerable.Empty<Data.Download>();
 		}
 		
@@ -70,5 +74,13 @@ public interface IDownloadRepository {
 		public Task<int> RetryFailed(CancellationToken cancellationToken) {
 			return Task.FromResult(0);
 		}
+		
+		public Task Remove(ICollection<string> normalizedUrls) {
+			return Task.CompletedTask;
+		}
+		
+		public IAsyncEnumerable<Data.Download> FindAllDownloadableUrls(CancellationToken cancellationToken) {
+			return AsyncEnumerable.Empty<Data.Download>();
+		}
 	}
 }

app/Server/Database/Repositories/IMessageRepository.cs

@@ -20,7 +20,9 @@ public interface IMessageRepository {
 	
 	IAsyncEnumerable<ulong> GetIds(MessageFilter? filter = null);
 	
-	Task Remove(MessageFilter filter, FilterRemovalMode mode);
+	Task<int> Remove(MessageFilter filter, FilterRemovalMode mode);
+	
+	Task<int> RemoveUnreachableAttachments();
 	
 	internal sealed class Dummy : IMessageRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
@@ -41,8 +43,12 @@ public interface IMessageRepository {
 			return AsyncEnumerable.Empty<ulong>();
 		}
 		
-		public Task Remove(MessageFilter filter, FilterRemovalMode mode) {
-			return Task.CompletedTask;
+		public Task<int> Remove(MessageFilter filter, FilterRemovalMode mode) {
+			return Task.FromResult(0);
+		}
+		
+		public Task<int> RemoveUnreachableAttachments() {
+			return Task.FromResult(0);
 		}
 	}
 }

app/Server/Database/Repositories/IServerRepository.cs

@@ -16,6 +16,8 @@ public interface IServerRepository {
 	
 	IAsyncEnumerable<Data.Server> Get(CancellationToken cancellationToken = default);
 	
+	Task<int> RemoveUnreachable();
+	
 	internal sealed class Dummy : IServerRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
 		
@@ -30,5 +32,9 @@ public interface IServerRepository {
 		public IAsyncEnumerable<Data.Server> Get(CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<Data.Server>();
 		}
+		
+		public Task<int> RemoveUnreachable() {
+			return Task.FromResult(0);
+		}
 	}
 }

app/Server/Database/Repositories/IUserRepository.cs

@@ -17,6 +17,8 @@ public interface IUserRepository {
 	
 	IAsyncEnumerable<User> Get(CancellationToken cancellationToken = default);
 	
+	Task<int> RemoveUnreachable();
+	
 	internal sealed class Dummy : IUserRepository {
 		public IObservable<long> TotalCount { get; } = Observable.Return(0L);
 		
@@ -31,5 +33,9 @@ public interface IUserRepository {
 		public IAsyncEnumerable<User> Get(CancellationToken cancellationToken) {
 			return AsyncEnumerable.Empty<User>();
 		}
+		
+		public Task<int> RemoveUnreachable() {
+			return Task.FromResult(0);
+		}
 	}
 }

app/Server/Database/Sqlite/Repositories/SqliteChannelRepository.cs

@@ -30,10 +30,10 @@ sealed class SqliteChannelRepository : BaseSqliteRepository, IChannelRepository
 				("parent_id", SqliteType.Integer),
 				("position", SqliteType.Integer),
 				("topic", SqliteType.Text),
-				("nsfw", SqliteType.Integer)
+				("nsfw", SqliteType.Integer),
 			]);
 			
-			foreach (var channel in channels) {
+			foreach (Channel channel in channels) {
 				cmd.Set(":id", channel.Id);
 				cmd.Set(":server", channel.Server);
 				cmd.Set(":name", channel.Name);
@@ -73,4 +73,14 @@ sealed class SqliteChannelRepository : BaseSqliteRepository, IChannelRepository
 			};
 		}
 	}
+	
+	public async Task<int> RemoveUnreachable() {
+		int removed;
+		await using (var conn = await pool.Take()) {
+			removed = await conn.ExecuteAsync("DELETE FROM channels WHERE id NOT IN (SELECT DISTINCT channel_id FROM messages)");
+		}
+		
+		UpdateTotalCount();
+		return removed;
+	}
 }

app/Server/Database/Sqlite/Repositories/SqliteDownloadRepository.cs

@@ -18,6 +18,8 @@ namespace DHT.Server.Database.Sqlite.Repositories;
 sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRepository(Log), IDownloadRepository {
 	private static readonly Log Log = Log.ForType<SqliteDownloadRepository>();
 	
+	public const string Schema = "downloads";
+	
 	internal sealed class NewDownloadCollector : IAsyncDisposable {
 		private readonly SqliteDownloadRepository repository;
 		private bool hasChanged = false;
@@ -71,7 +73,25 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 		}
 	}
 	
+	private static SqliteBlob BlobReference(ISqliteConnection conn, long rowid, bool readOnly) {
+		string schema = conn.HasAttachedDatabase(Schema) ? Schema : "main";
+		return new SqliteBlob(conn.InnerConnection, databaseName: schema, tableName: "download_blobs", columnName: "blob", rowid, readOnly);
+	}
+	
 	public async Task AddDownload(Data.Download item, Stream? stream) {
+		ulong? actualSize;
+		
+		if (stream is not null) {
+			actualSize = (ulong) stream.Length;
+			
+			if (actualSize != item.Size) {
+				Log.Warn("Download size differs from its metadata - metadata size: " + item.Size + " B, actual size: " + actualSize + " B, url: " + item.NormalizedUrl);
+			}
+		}
+		else {
+			actualSize = item.Size;
+		}
+		
 		await using (var conn = await pool.Take()) {
 			await conn.BeginTransactionAsync();
 			
@@ -87,7 +107,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			metadataCmd.Set(":download_url", item.DownloadUrl);
 			metadataCmd.Set(":status", (int) item.Status);
 			metadataCmd.Set(":type", item.Type);
-			metadataCmd.Set(":size", item.Size);
+			metadataCmd.Set(":size", actualSize);
 			await metadataCmd.ExecuteNonQueryAsync();
 			
 			if (stream == null) {
@@ -107,10 +127,10 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 				);
 				
 				upsertBlobCmd.AddAndSet(":normalized_url", SqliteType.Text, item.NormalizedUrl);
-				upsertBlobCmd.AddAndSet(":blob_length", SqliteType.Integer, item.Size);
+				upsertBlobCmd.AddAndSet(":blob_length", SqliteType.Integer, actualSize);
 				long rowid = await upsertBlobCmd.ExecuteLongScalarAsync();
 				
-				await using var blob = new SqliteBlob(conn.InnerConnection, "download_blobs", "blob", rowid);
+				await using var blob = BlobReference(conn, rowid, readOnly: false);
 				await stream.CopyToAsync(blob);
 			}
 			
@@ -177,14 +197,14 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			FailedWithUnknownSizeCount = reader.GetInt32(8),
 			SkippedCount = reader.GetInt32(9),
 			SkippedTotalSize = reader.GetUint64(10),
-			SkippedWithUnknownSizeCount = reader.GetInt32(11)
+			SkippedWithUnknownSizeCount = reader.GetInt32(11),
 		};
 	}
 	
-	public async IAsyncEnumerable<Data.Download> Get() {
+	public async IAsyncEnumerable<Data.Download> Get(DownloadItemFilter? filter) {
 		await using var conn = await pool.Take();
 		
-		await using var cmd = conn.Command("SELECT normalized_url, download_url, status, type, size FROM download_metadata");
+		await using var cmd = conn.Command("SELECT normalized_url, download_url, status, type, size FROM download_metadata" + filter.GenerateConditions().BuildWhereClause());
 		await using var reader = await cmd.ExecuteReaderAsync();
 		
 		while (await reader.ReadAsync()) {
@@ -206,7 +226,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 		
 		long rowid;
 		
-		await using (var reader = await cmd.ExecuteReaderAsync()) {
+		await using (SqliteDataReader reader = await cmd.ExecuteReaderAsync()) {
 			if (!await reader.ReadAsync()) {
 				return false;
 			}
@@ -214,7 +234,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			rowid = reader.GetInt64(0);
 		}
 		
-		await using (var blob = new SqliteBlob(conn.InnerConnection, "download_blobs", "blob", rowid, readOnly: true)) {
+		await using (var blob = BlobReference(conn, rowid, readOnly: true)) {
 			await dataProcessor(blob);
 		}
 		
@@ -249,7 +269,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			rowid = reader.GetInt64(2);
 		}
 		
-		await using (var blob = new SqliteBlob(conn.InnerConnection, "download_blobs", "blob", rowid, readOnly: true)) {
+		await using (var blob = BlobReference(conn, rowid, readOnly: true)) {
 			await dataProcessor(new Data.Download(normalizedUrl, downloadUrl, DownloadStatus.Success, type, (ulong) blob.Length), blob, cancellationToken);
 		}
 		
@@ -264,7 +284,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 		
 		await using var conn = await pool.Take();
 		
-		var sql = $"""
+		string sql = $"""
 		              SELECT normalized_url, download_url, type, size
 		              FROM download_metadata
 		              {filter.GenerateConditions().BuildWhereClause()}
@@ -272,7 +292,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 		              """;
 		
 		await using (var cmd = conn.Command(sql)) {
-			cmd.AddAndSet(":limit", SqliteType.Integer, Math.Max(0, count));
+			cmd.AddAndSet(":limit", SqliteType.Integer, Math.Max(val1: 0, count));
 			
 			await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
 			
@@ -281,7 +301,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 					NormalizedUrl = reader.GetString(0),
 					DownloadUrl = reader.GetString(1),
 					Type = reader.IsDBNull(2) ? null : reader.GetString(2),
-					Size = reader.IsDBNull(3) ? null : reader.GetUint64(3)
+					Size = reader.IsDBNull(3) ? null : reader.GetUint64(3),
 				});
 			}
 		}
@@ -292,7 +312,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			cmd.AddAndSet(":downloading", SqliteType.Integer, (int) DownloadStatus.Downloading);
 			cmd.Add(":normalized_url", SqliteType.Text);
 			
-			foreach (var item in found) {
+			foreach (DownloadItem item in found) {
 				cmd.Set(":normalized_url", item.NormalizedUrl);
 				
 				if (await cmd.ExecuteNonQueryAsync(cancellationToken) == 1) {
@@ -321,4 +341,62 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 		cmd.AddAndSet(":success", SqliteType.Integer, (int) DownloadStatus.Success);
 		return await cmd.ExecuteNonQueryAsync(cancellationToken);
 	}
+	
+	public async Task Remove(ICollection<string> normalizedUrls) {
+		await using (var conn = await pool.Take()) {
+			await conn.BeginTransactionAsync();
+			
+			await using (var cmd = conn.Command("DELETE FROM download_metadata WHERE normalized_url = :normalized_url")) {
+				cmd.Add(":normalized_url", SqliteType.Text);
+				
+				foreach (string normalizedUrl in normalizedUrls) {
+					cmd.Set(":normalized_url", normalizedUrl);
+					await cmd.ExecuteNonQueryAsync();
+				}
+			}
+			
+			await conn.CommitTransactionAsync();
+		}
+		
+		UpdateTotalCount();
+	}
+	
+	public async IAsyncEnumerable<Data.Download> FindAllDownloadableUrls([EnumeratorCancellation] CancellationToken cancellationToken = default) {
+		await using var conn = await pool.Take();
+		
+		await using (var cmd = conn.Command("SELECT normalized_url, download_url, type, size FROM attachments")) {
+			await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
+			
+			while (await reader.ReadAsync(cancellationToken)) {
+				yield return DownloadLinkExtractor.FromAttachment(reader.GetString(0), reader.GetString(1), reader.IsDBNull(2) ? null : reader.GetString(2), reader.GetUint64(3));
+			}
+		}
+		
+		await using (var cmd = conn.Command("SELECT json FROM message_embeds")) {
+			await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
+			
+			while (await reader.ReadAsync(cancellationToken)) {
+				var result = await DownloadLinkExtractor.TryFromEmbedJson(reader.GetStream(0));
+				if (result is not null) {
+					yield return result;
+				}
+			}
+		}
+		
+		await using (var cmd = conn.Command("SELECT id, avatar_url FROM users WHERE avatar_url IS NOT NULL")) {
+			await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
+			
+			while (await reader.ReadAsync(cancellationToken)) {
+				yield return DownloadLinkExtractor.FromUserAvatar(reader.GetUint64(0), reader.GetString(1));
+			}
+		}
+		
+		await using (var cmd = conn.Command("SELECT DISTINCT emoji_id, emoji_flags FROM message_reactions WHERE emoji_id IS NOT NULL")) {
+			await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
+			
+			while (await reader.ReadAsync(cancellationToken)) {
+				yield return DownloadLinkExtractor.FromEmoji(reader.GetUint64(0), (EmojiFlags) reader.GetInt16(1));
+			}
+		}
+	}
 }

app/Server/Database/Sqlite/Repositories/SqliteMessageRepository.cs

@@ -39,7 +39,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				("sender_id", SqliteType.Integer),
 				("channel_id", SqliteType.Integer),
 				("text", SqliteType.Text),
-				("timestamp", SqliteType.Integer)
+				("timestamp", SqliteType.Integer),
 			]);
 			
 			await using var attachmentCmd = conn.Upsert("attachments", [
@@ -50,7 +50,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				("download_url", SqliteType.Text),
 				("size", SqliteType.Integer),
 				("width", SqliteType.Integer),
-				("height", SqliteType.Integer)
+				("height", SqliteType.Integer),
 			]);
 			
 			await using var deleteMessageEditTimestampCmd = DeleteByMessageId(conn, "message_edit_timestamps");
@@ -62,22 +62,22 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 			
 			await using var messageEditTimestampCmd = conn.Insert("message_edit_timestamps", [
 				("message_id", SqliteType.Integer),
-				("edit_timestamp", SqliteType.Integer)
+				("edit_timestamp", SqliteType.Integer),
 			]);
 			
 			await using var messageRepliedToCmd = conn.Insert("message_replied_to", [
 				("message_id", SqliteType.Integer),
-				("replied_to_id", SqliteType.Integer)
+				("replied_to_id", SqliteType.Integer),
 			]);
 			
 			await using var messageAttachmentCmd = conn.Insert("message_attachments", [
 				("message_id", SqliteType.Integer),
-				("attachment_id", SqliteType.Integer)
+				("attachment_id", SqliteType.Integer),
 			]);
 			
 			await using var messageEmbedCmd = conn.Insert("message_embeds", [
 				("message_id", SqliteType.Integer),
-				("json", SqliteType.Text)
+				("json", SqliteType.Text),
 			]);
 			
 			await using var messageReactionCmd = conn.Insert("message_reactions", [
@@ -85,12 +85,12 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				("emoji_id", SqliteType.Integer),
 				("emoji_name", SqliteType.Text),
 				("emoji_flags", SqliteType.Integer),
-				("count", SqliteType.Integer)
+				("count", SqliteType.Integer),
 			]);
 			
 			await using var downloadCollector = new SqliteDownloadRepository.NewDownloadCollector(downloads, conn);
 			
-			foreach (var message in messages) {
+			foreach (Message message in messages) {
 				object messageId = message.Id;
 				
 				messageCmd.Set(":message_id", messageId);
@@ -120,7 +120,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				}
 				
 				if (!message.Attachments.IsEmpty) {
-					foreach (var attachment in message.Attachments) {
+					foreach (Attachment attachment in message.Attachments) {
 						object attachmentId = attachment.Id;
 						
 						attachmentCmd.Set(":attachment_id", attachmentId);
@@ -142,7 +142,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				}
 				
 				if (!message.Embeds.IsEmpty) {
-					foreach (var embed in message.Embeds) {
+					foreach (Embed embed in message.Embeds) {
 						messageEmbedCmd.Set(":message_id", messageId);
 						messageEmbedCmd.Set(":json", embed.Json);
 						await messageEmbedCmd.ExecuteNonQueryAsync();
@@ -154,7 +154,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				}
 				
 				if (!message.Reactions.IsEmpty) {
-					foreach (var reaction in message.Reactions) {
+					foreach (Reaction reaction in message.Reactions) {
 						messageReactionCmd.Set(":message_id", messageId);
 						messageReactionCmd.Set(":emoji_id", reaction.EmojiId);
 						messageReactionCmd.Set(":emoji_name", reaction.EmojiName);
@@ -245,7 +245,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 			""";
 		
 		await using var embedCmd = new MessageToManyCommand<Embed>(conn, EmbedSql, static reader => new Embed {
-			Json = reader.GetString(0)
+			Json = reader.GetString(0),
 		});
 		
 		const string ReactionSql =
@@ -287,7 +287,7 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 				RepliedToId = reader.IsDBNull(6) ? null : reader.GetUint64(6),
 				Attachments = await attachmentCmd.GetItems(messageId),
 				Embeds = await embedCmd.GetItems(messageId),
-				Reactions = await reactionsCmd.GetItems(messageId)
+				Reactions = await reactionsCmd.GetItems(messageId),
 			};
 		}
 	}
@@ -303,9 +303,10 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 		}
 	}
 	
-	public async Task Remove(MessageFilter filter, FilterRemovalMode mode) {
+	public async Task<int> Remove(MessageFilter filter, FilterRemovalMode mode) {
+		int removed;
 		await using (var conn = await pool.Take()) {
-			await conn.ExecuteAsync(
+			removed = await conn.ExecuteAsync(
 				          $"""
 				           -- noinspection SqlWithoutWhere
 				           DELETE FROM messages
@@ -315,5 +316,11 @@ sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRe
 		}
 		
 		UpdateTotalCount();
+		return removed;
+	}
+	
+	public async Task<int> RemoveUnreachableAttachments() {
+		await using var conn = await pool.Take();
+		return await conn.ExecuteAsync("DELETE FROM attachments WHERE attachment_id NOT IN (SELECT DISTINCT attachment_id FROM message_attachments)");
 	}
 }

app/Server/Database/Sqlite/Repositories/SqliteServerRepository.cs

@@ -26,10 +26,10 @@ sealed class SqliteServerRepository : BaseSqliteRepository, IServerRepository {
 			await using var cmd = conn.Upsert("servers", [
 				("id", SqliteType.Integer),
 				("name", SqliteType.Text),
-				("type", SqliteType.Text)
+				("type", SqliteType.Text),
 			]);
 			
-			foreach (var server in servers) {
+			foreach (Data.Server server in servers) {
 				cmd.Set(":id", server.Id);
 				cmd.Set(":name", server.Name);
 				cmd.Set(":type", ServerTypes.ToString(server.Type));
@@ -61,4 +61,14 @@ sealed class SqliteServerRepository : BaseSqliteRepository, IServerRepository {
 			};
 		}
 	}
+	
+	public async Task<int> RemoveUnreachable() {
+		int removed;
+		await using (var conn = await pool.Take()) {
+			removed = await conn.ExecuteAsync("DELETE FROM servers WHERE id NOT IN (SELECT DISTINCT server FROM channels)");
+		}
+		
+		UpdateTotalCount();
+		return removed;
+	}
 }

app/Server/Database/Sqlite/Repositories/SqliteSettingsRepository.cs

@@ -43,16 +43,20 @@ sealed class SqliteSettingsRepository(SqliteConnectionPool pool) : ISettingsRepo
 	}
 	
 	public async Task<T?> Get<T>(SettingsKey<T> key, T? defaultValue) {
+		await using var conn = await pool.Take();
+		return await Get(conn, key, defaultValue);
+	}
+	
+	public static async Task<T?> Get<T>(ISqliteConnection conn, SettingsKey<T> key, T? defaultValue) {
 		string? value;
 		
-		await using (var conn = await pool.Take()) {
-			await using var cmd = conn.Command("SELECT value FROM metadata WHERE key = :key");
+		await using (var cmd = conn.Command("SELECT value FROM metadata WHERE key = :key")) {
 			cmd.AddAndSet(":key", SqliteType.Text, key.Key);
 			
 			await using var reader = await cmd.ExecuteReaderAsync();
 			value = await reader.ReadAsync() ? reader.GetString(0) : null;
 		}
 		
-		return value != null && key.FromString(value, out var convertedValue) ? convertedValue : defaultValue;
+		return value != null && key.FromString(value, out T convertedValue) ? convertedValue : defaultValue;
 	}
 }

app/Server/Database/Sqlite/Repositories/SqliteUserRepository.cs

@@ -31,12 +31,12 @@ sealed class SqliteUserRepository : BaseSqliteRepository, IUserRepository {
 				("name", SqliteType.Text),
 				("display_name", SqliteType.Text),
 				("avatar_url", SqliteType.Text),
-				("discriminator", SqliteType.Text)
+				("discriminator", SqliteType.Text),
 			]);
 			
 			await using var downloadCollector = new SqliteDownloadRepository.NewDownloadCollector(downloads, conn);
 			
-			foreach (var user in users) {
+			foreach (User user in users) {
 				cmd.Set(":id", user.Id);
 				cmd.Set(":name", user.Name);
 				cmd.Set(":display_name", user.DisplayName);
@@ -77,4 +77,14 @@ sealed class SqliteUserRepository : BaseSqliteRepository, IUserRepository {
 			};
 		}
 	}
+	
+	public async Task<int> RemoveUnreachable() {
+		int removed;
+		await using (var conn = await pool.Take()) {
+			removed = await conn.ExecuteAsync("DELETE FROM users WHERE id NOT IN (SELECT DISTINCT sender_id FROM messages)");
+		}
+		
+		UpdateTotalCount();
+		return removed;
+	}
 }

app/Server/Database/Sqlite/Schema/ISchemaUpgradeCallbacks.cs

@@ -1,9 +1,11 @@
 using System;
 using System.Threading.Tasks;
+using DHT.Server.Database.Sqlite.Utils;
 
 namespace DHT.Server.Database.Sqlite.Schema;
 
 public interface ISchemaUpgradeCallbacks {
+	Task<InitialDatabaseSettings?> GetInitialDatabaseSettings();
 	Task<bool> CanUpgrade();
 	Task Start(int versionSteps, Func<IProgressReporter, Task> doUpgrade);
 	

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo10.cs

@@ -0,0 +1,77 @@
+using System.Threading.Tasks;
+using DHT.Server.Database.Sqlite.Utils;
+using DHT.Utils.Logging;
+
+namespace DHT.Server.Database.Sqlite.Schema;
+
+sealed class SqliteSchemaUpgradeTo10 : ISchemaUpgrade {
+	private static readonly Log Log = Log.ForType<SqliteSchemaUpgradeTo10>();
+	
+	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
+		await reporter.MainWork("Migrating message embeds...", finishedItems: 0, totalItems: 6);
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_embeds_new (
+		                        	message_id INTEGER NOT NULL,
+		                        	json       TEXT NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+		await conn.ExecuteAsync("INSERT INTO message_embeds_new (message_id, json) SELECT message_id, json FROM message_embeds WHERE message_id IN (SELECT DISTINCT message_id FROM messages)");
+		
+		await reporter.MainWork("Migrating message reactions...", finishedItems: 1, totalItems: 6);
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_reactions_new (
+		                        	message_id  INTEGER NOT NULL,
+		                        	emoji_id    INTEGER,
+		                        	emoji_name  TEXT,
+		                        	emoji_flags INTEGER NOT NULL,
+		                        	count       INTEGER NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+		await conn.ExecuteAsync("INSERT INTO message_reactions_new (message_id, emoji_id, emoji_name, emoji_flags, count) SELECT message_id, emoji_id, emoji_name, emoji_flags, count FROM message_reactions WHERE message_id IN (SELECT DISTINCT message_id FROM messages)");
+		
+		await reporter.MainWork("Migrating message edit timestamps...", finishedItems: 2, totalItems: 6);
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_edit_timestamps_new (
+		                        	message_id     INTEGER PRIMARY KEY NOT NULL,
+		                        	edit_timestamp INTEGER NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+		await conn.ExecuteAsync("INSERT INTO message_edit_timestamps_new (message_id, edit_timestamp) SELECT message_id, edit_timestamp FROM message_edit_timestamps WHERE message_id IN (SELECT DISTINCT message_id FROM messages)");
+		
+		await reporter.MainWork("Migrating message replies...", finishedItems: 3, totalItems: 6);
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_replied_to_new (
+		                        	message_id    INTEGER PRIMARY KEY NOT NULL,
+		                        	replied_to_id INTEGER NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+		await conn.ExecuteAsync("INSERT INTO message_replied_to_new (message_id, replied_to_id) SELECT message_id, replied_to_id FROM message_replied_to WHERE message_id IN (SELECT DISTINCT message_id FROM messages)");
+		
+		await reporter.MainWork("Applying schema changes...", finishedItems: 4, totalItems: 6);
+		
+		await conn.ExecuteAsync("DROP TABLE message_embeds");
+		await conn.ExecuteAsync("ALTER TABLE message_embeds_new RENAME TO message_embeds");
+		await conn.ExecuteAsync("CREATE INDEX embeds_message_ix ON message_embeds(message_id)");
+		
+		await conn.ExecuteAsync("DROP TABLE message_reactions");
+		await conn.ExecuteAsync("ALTER TABLE message_reactions_new RENAME TO message_reactions");
+		await conn.ExecuteAsync("CREATE INDEX reactions_message_ix ON message_reactions(message_id)");
+		
+		await conn.ExecuteAsync("DROP TABLE message_edit_timestamps");
+		await conn.ExecuteAsync("ALTER TABLE message_edit_timestamps_new RENAME TO message_edit_timestamps");
+		
+		await conn.ExecuteAsync("DROP TABLE message_replied_to");
+		await conn.ExecuteAsync("ALTER TABLE message_replied_to_new RENAME TO message_replied_to");
+		
+		await reporter.MainWork("Removing orphaned objects...", finishedItems: 5, totalItems: 6);
+		
+		Log.Info("Removed orphaned attachments: " + await conn.ExecuteAsync("DELETE FROM attachments WHERE attachment_id NOT IN (SELECT DISTINCT attachment_id FROM message_attachments)"));
+		Log.Info("Removed orphaned users: " + await conn.ExecuteAsync("DELETE FROM users WHERE id NOT IN (SELECT DISTINCT sender_id FROM messages)"));
+		Log.Info("Removed orphaned channels: " + await conn.ExecuteAsync("DELETE FROM channels WHERE id NOT IN (SELECT DISTINCT channel_id FROM messages)"));
+		Log.Info("Removed orphaned servers: " + await conn.ExecuteAsync("DELETE FROM servers WHERE id NOT IN (SELECT DISTINCT server FROM channels)"));
+	}
+}

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo2.cs

@@ -5,7 +5,7 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo2 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 1);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 1);
 		await conn.ExecuteAsync("ALTER TABLE channels ADD parent_id INTEGER");
 	}
 }

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo3.cs

@@ -5,13 +5,21 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo3 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 1);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 1);
 		
-		await SqliteSchema.CreateMessageEditTimestampTable(conn);
-		await conn.ExecuteAsync("ALTER TABLE message_edit_timestamps RENAME TO edit_timestamps");
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE edit_timestamps (
+		                        	message_id     INTEGER PRIMARY KEY NOT NULL,
+		                        	edit_timestamp INTEGER NOT NULL
+		                        )
+		                        """);
 		
-		await SqliteSchema.CreateMessageRepliedToTable(conn);
-		await conn.ExecuteAsync("ALTER TABLE message_replied_to RENAME TO replied_to");
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE replied_to (
+		                        	message_id    INTEGER PRIMARY KEY NOT NULL,
+		                        	replied_to_id INTEGER NOT NULL
+		                        )
+		                        """);
 		
 		await conn.ExecuteAsync("""
 		                        INSERT INTO edit_timestamps (message_id, edit_timestamp)
@@ -30,7 +38,7 @@ sealed class SqliteSchemaUpgradeTo3 : ISchemaUpgrade {
 		await conn.ExecuteAsync("ALTER TABLE messages DROP COLUMN replied_to_id");
 		await conn.ExecuteAsync("ALTER TABLE messages DROP COLUMN edit_timestamp");
 		
-		await reporter.MainWork("Vacuuming the database...", 1, 1);
+		await reporter.MainWork("Vacuuming the database...", finishedItems: 1, totalItems: 1);
 		await conn.ExecuteAsync("VACUUM");
 	}
 }

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo4.cs

@@ -5,7 +5,7 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo4 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 1);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 1);
 		
 		await conn.ExecuteAsync("""
 		                        CREATE TABLE downloads (

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo5.cs

@@ -5,7 +5,7 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo5 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 1);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 1);
 		await conn.ExecuteAsync("ALTER TABLE attachments ADD width INTEGER");
 		await conn.ExecuteAsync("ALTER TABLE attachments ADD height INTEGER");
 	}

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo6.cs

@@ -8,23 +8,23 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 3);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 3);
 		await conn.ExecuteAsync("ALTER TABLE attachments ADD download_url TEXT");
 		await conn.ExecuteAsync("ALTER TABLE downloads ADD download_url TEXT");
 		
-		await reporter.MainWork("Updating attachments...", 1, 3);
+		await reporter.MainWork("Updating attachments...", finishedItems: 1, totalItems: 3);
 		await NormalizeAttachmentUrls(conn, reporter);
 		
-		await reporter.MainWork("Updating downloads...", 2, 3);
+		await reporter.MainWork("Updating downloads...", finishedItems: 2, totalItems: 3);
 		await NormalizeDownloadUrls(conn, reporter);
 		
-		await reporter.MainWork("Applying schema changes...", 3, 3);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 3, totalItems: 3);
 		await conn.ExecuteAsync("ALTER TABLE attachments RENAME COLUMN url TO normalized_url");
 		await conn.ExecuteAsync("ALTER TABLE downloads RENAME COLUMN url TO normalized_url");
 	}
 	
 	private async Task NormalizeAttachmentUrls(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.SubWork("Preparing attachments...", 0, 0);
+		await reporter.SubWork("Preparing attachments...", finishedItems: 0, totalItems: 0);
 		
 		var normalizedUrls = new Dictionary<long, string>();
 		
@@ -32,8 +32,8 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 			await using var reader = await selectCmd.ExecuteReaderAsync();
 			
 			while (await reader.ReadAsync()) {
-				var attachmentId = reader.GetInt64(0);
-				var originalUrl = reader.GetString(1);
+				long attachmentId = reader.GetInt64(0);
+				string originalUrl = reader.GetString(1);
 				normalizedUrls[attachmentId] = DiscordCdn.NormalizeUrl(originalUrl);
 			}
 		}
@@ -47,7 +47,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 			updateCmd.Add(":attachment_id", SqliteType.Integer);
 			updateCmd.Add(":normalized_url", SqliteType.Text);
 			
-			foreach (var (attachmentId, normalizedUrl) in normalizedUrls) {
+			foreach ((long attachmentId, string normalizedUrl) in normalizedUrls) {
 				if (++processedUrls % 1000 == 0) {
 					await reporter.SubWork("Updating URLs...", processedUrls, totalUrls);
 				}
@@ -64,7 +64,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 	}
 	
 	private async Task NormalizeDownloadUrls(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.SubWork("Preparing downloads...", 0, 0);
+		await reporter.SubWork("Preparing downloads...", finishedItems: 0, totalItems: 0);
 		
 		var normalizedUrlsToOriginalUrls = new Dictionary<string, string>();
 		var duplicateUrlsToDelete = new HashSet<string>();
@@ -73,8 +73,8 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 			await using var reader = await selectCmd.ExecuteReaderAsync();
 			
 			while (await reader.ReadAsync()) {
-				var originalUrl = reader.GetString(0);
-				var normalizedUrl = DiscordCdn.NormalizeUrl(originalUrl);
+				string originalUrl = reader.GetString(0);
+				string normalizedUrl = DiscordCdn.NormalizeUrl(originalUrl);
 				
 				if (!normalizedUrlsToOriginalUrls.TryAdd(normalizedUrl, originalUrl)) {
 					duplicateUrlsToDelete.Add(originalUrl);
@@ -85,10 +85,10 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 		await conn.ExecuteAsync("PRAGMA cache_size = -20000");
 		await conn.BeginTransactionAsync();
 		
-		await reporter.SubWork("Deleting duplicates...", 0, 0);
+		await reporter.SubWork("Deleting duplicates...", finishedItems: 0, totalItems: 0);
 		
 		await using (var deleteCmd = conn.Delete("downloads", ("url", SqliteType.Text))) {
-			foreach (var duplicateUrl in duplicateUrlsToDelete) {
+			foreach (string duplicateUrl in duplicateUrlsToDelete) {
 				deleteCmd.Set(":url", duplicateUrl);
 				await deleteCmd.ExecuteNonQueryAsync();
 			}
@@ -105,7 +105,7 @@ sealed class SqliteSchemaUpgradeTo6 : ISchemaUpgrade {
 			updateCmd.Add(":normalized_url", SqliteType.Text);
 			updateCmd.Add(":download_url", SqliteType.Text);
 			
-			foreach (var (normalizedUrl, downloadUrl) in normalizedUrlsToOriginalUrls) {
+			foreach ((string normalizedUrl, string downloadUrl) in normalizedUrlsToOriginalUrls) {
 				if (++processedUrls % 100 == 0) {
 					await reporter.SubWork("Updating URLs...", processedUrls, totalUrls);
 					

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo7.cs

@@ -9,33 +9,33 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 6);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 6);
 		await SqliteSchema.CreateDownloadTables(conn);
 		
-		await reporter.MainWork("Migrating download metadata...", 1, 6);
+		await reporter.MainWork("Migrating download metadata...", finishedItems: 1, totalItems: 6);
 		await conn.ExecuteAsync("INSERT INTO download_metadata (normalized_url, download_url, status, size) SELECT normalized_url, download_url, status, size FROM downloads");
 		
-		await reporter.MainWork("Merging attachment metadata...", 2, 6);
+		await reporter.MainWork("Merging attachment metadata...", finishedItems: 2, totalItems: 6);
 		await conn.ExecuteAsync("UPDATE download_metadata SET type = (SELECT type FROM attachments WHERE download_metadata.normalized_url = attachments.normalized_url)");
 		
-		await reporter.MainWork("Migrating downloaded files...", 3, 6);
+		await reporter.MainWork("Migrating downloaded files...", finishedItems: 3, totalItems: 6);
 		await MigrateDownloadBlobsToNewTable(conn, reporter);
 		
-		await reporter.MainWork("Applying schema changes...", 4, 6);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 4, totalItems: 6);
 		await conn.ExecuteAsync("DROP TABLE downloads");
 		
-		await reporter.MainWork("Discovering downloadable links...", 5, 6);
+		await reporter.MainWork("Discovering downloadable links...", finishedItems: 5, totalItems: 6);
 		await DiscoverDownloadableLinks(conn, reporter);
 	}
 	
 	private async Task MigrateDownloadBlobsToNewTable(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.SubWork("Listing downloaded files...", 0, 0);
+		await reporter.SubWork("Listing downloaded files...", finishedItems: 0, totalItems: 0);
 		
-		var urlsToMigrate = await GetDownloadedFileUrls(conn);
+		List<string> urlsToMigrate = await GetDownloadedFileUrls(conn);
 		int totalFiles = urlsToMigrate.Count;
 		int processedFiles = -1;
 		
-		await reporter.SubWork("Processing downloaded files...", 0, totalFiles);
+		await reporter.SubWork("Processing downloaded files...", finishedItems: 0, totalFiles);
 		
 		await conn.BeginTransactionAsync();
 		
@@ -44,7 +44,7 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 			insertCmd.Add(":normalized_url", SqliteType.Text);
 			deleteCmd.Add(":normalized_url", SqliteType.Text);
 			
-			foreach (var url in urlsToMigrate) {
+			foreach (string url in urlsToMigrate) {
 				if (++processedFiles % 10 == 0) {
 					await reporter.SubWork("Processing downloaded files...", processedFiles, totalFiles);
 					
@@ -84,7 +84,7 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 	}
 	
 	private async Task DiscoverDownloadableLinks(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.SubWork("Processing attachments...", 0, 4);
+		await reporter.SubWork("Processing attachments...", finishedItems: 0, totalItems: 4);
 		
 		await using (var cmd = conn.Command("""
 		                                    INSERT OR IGNORE INTO download_metadata (normalized_url, download_url, status, type, size)
@@ -118,7 +118,7 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 		insertCmd.Add(":type", SqliteType.Text);
 		insertCmd.Add(":size", SqliteType.Integer);
 		
-		await reporter.SubWork("Processing embeds...", 1, 4);
+		await reporter.SubWork("Processing embeds...", finishedItems: 1, totalItems: 4);
 		
 		await using (var embedCmd = conn.Command("SELECT json FROM embeds")) {
 			await using var reader = await embedCmd.ExecuteReaderAsync();
@@ -128,7 +128,7 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 			}
 		}
 		
-		await reporter.SubWork("Processing users...", 2, 4);
+		await reporter.SubWork("Processing users...", finishedItems: 2, totalItems: 4);
 		
 		await using (var avatarCmd = conn.Command("SELECT id, avatar_url FROM users WHERE avatar_url IS NOT NULL")) {
 			await using var reader = await avatarCmd.ExecuteReaderAsync();
@@ -138,7 +138,7 @@ sealed class SqliteSchemaUpgradeTo7 : ISchemaUpgrade {
 			}
 		}
 		
-		await reporter.SubWork("Processing reactions...", 3, 4);
+		await reporter.SubWork("Processing reactions...", finishedItems: 3, totalItems: 4);
 		
 		await using (var avatarCmd = conn.Command("SELECT DISTINCT emoji_id, emoji_flags FROM reactions WHERE emoji_id IS NOT NULL")) {
 			await using var reader = await avatarCmd.ExecuteReaderAsync();

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo8.cs

@@ -5,7 +5,7 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo8 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 1);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 1);
 		await conn.ExecuteAsync("ALTER TABLE users ADD display_name TEXT");
 	}
 }

app/Server/Database/Sqlite/Schema/SqliteSchemaUpgradeTo9.cs

@@ -5,13 +5,13 @@ namespace DHT.Server.Database.Sqlite.Schema;
 
 sealed class SqliteSchemaUpgradeTo9 : ISchemaUpgrade {
 	async Task ISchemaUpgrade.Run(ISqliteConnection conn, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
-		await reporter.MainWork("Applying schema changes...", 0, 3);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 0, totalItems: 3);
 		await SqliteSchema.CreateMessageAttachmentsTable(conn);
 		
-		await reporter.MainWork("Migrating message attachments...", 1, 3);
+		await reporter.MainWork("Migrating message attachments...", finishedItems: 1, totalItems: 3);
 		await conn.ExecuteAsync("INSERT INTO message_attachments (message_id, attachment_id) SELECT message_id, attachment_id FROM attachments a JOIN messages m USING (message_id)");
 		
-		await reporter.MainWork("Applying schema changes...", 2, 3);
+		await reporter.MainWork("Applying schema changes...", finishedItems: 2, totalItems: 3);
 		await conn.ExecuteAsync("DROP INDEX attachments_message_ix");
 		await conn.ExecuteAsync("ALTER TABLE attachments DROP COLUMN message_id");
 		

app/Server/Database/Sqlite/SqliteDatabaseFile.cs

@@ -1,42 +1,46 @@
-using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
+using DHT.Server.Data.Settings;
 using DHT.Server.Database.Repositories;
 using DHT.Server.Database.Sqlite.Repositories;
 using DHT.Server.Database.Sqlite.Schema;
 using DHT.Server.Database.Sqlite.Utils;
-using Microsoft.Data.Sqlite;
+using DHT.Utils.Logging;
 
 namespace DHT.Server.Database.Sqlite;
 
 public sealed class SqliteDatabaseFile : IDatabaseFile {
+	private static readonly Log Log = Log.ForType<SqliteDatabaseFile>();
+	
 	private const int DefaultPoolSize = 5;
 	
 	public static async Task<SqliteDatabaseFile?> OpenOrCreate(string path, ISchemaUpgradeCallbacks schemaUpgradeCallbacks) {
-		var connectionString = new SqliteConnectionStringBuilder {
-			DataSource = path,
-			Mode = SqliteOpenMode.ReadWriteCreate,
-		};
+		var connectionString = new SqliteConnectionStringFactory(path);
+		var attachedDatabaseCollector = new AttachedDatabaseCollector(path);
 		
-		var pool = await SqliteConnectionPool.Create(connectionString, DefaultPoolSize);
 		bool wasOpened;
-
-		try {
-			await using var conn = await pool.Take();
-			wasOpened = await new SqliteSchema(conn).Setup(schemaUpgradeCallbacks);
-		} catch (Exception) {
-			await pool.DisposeAsync();
-			throw;
+		await using (var conn = await CustomSqliteConnection.OpenUnpooled(connectionString)) {
+			wasOpened = await new SqliteSchema(conn).Setup(attachedDatabaseCollector, schemaUpgradeCallbacks);
 		}
 		
 		if (wasOpened) {
+			var pool = await SqliteConnectionPool.Create(connectionString, DefaultPoolSize, attachedDatabaseCollector);
 			return new SqliteDatabaseFile(path, pool);
 		}
 		else {
-			await pool.DisposeAsync();
 			return null;
 		}
 	}
 	
+	private sealed class AttachedDatabaseCollector(string path) : ISqliteAttachedDatabaseCollector {
+		public async IAsyncEnumerable<AttachedDatabase> GetAttachedDatabases(ISqliteConnection conn) {
+			bool useSeparateFileForDownloads = await SqliteSettingsRepository.Get(conn, SettingsKey.SeparateFileForDownloads, defaultValue: false);
+			if (useSeparateFileForDownloads) {
+				yield return new AttachedDatabase(path + "_downloads", SqliteDownloadRepository.Schema);
+			}
+		}
+	}
+	
 	public string Path { get; }
 	
 	public ISettingsRepository Settings => settings;
@@ -78,6 +82,21 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 	
 	public async Task Vacuum() {
 		await using var conn = await pool.Take();
+		
+		Perf perf = Log.Start();
 		await conn.ExecuteAsync("VACUUM");
+		perf.Step("Vacuum main schema");
+		
+		await VacuumAttachedDatabase(conn, perf, SqliteDownloadRepository.Schema);
+		
+		perf.End();
+		return;
+		
+		static async Task VacuumAttachedDatabase(ISqliteConnection conn, Perf perf, string schema) {
+			if (conn.HasAttachedDatabase(schema)) {
+				await conn.ExecuteAsync("VACUUM " + schema);
+				perf.Step("Vacuum " + schema + " schema");
+			}
+		}
 	}
 }

app/Server/Database/Sqlite/SqliteSchema.cs

@@ -1,28 +1,32 @@
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
 using System.Threading.Tasks;
+using DHT.Server.Data.Settings;
 using DHT.Server.Database.Exceptions;
+using DHT.Server.Database.Sqlite.Repositories;
 using DHT.Server.Database.Sqlite.Schema;
 using DHT.Server.Database.Sqlite.Utils;
 using DHT.Utils.Logging;
+using Microsoft.Data.Sqlite;
 
 namespace DHT.Server.Database.Sqlite;
 
-sealed class SqliteSchema {
-	internal const int Version = 9;
+sealed class SqliteSchema(CustomSqliteConnection conn) {
+	internal const int Version = 10;
 	
 	private static readonly Log Log = Log.ForType<SqliteSchema>();
 	
-	private readonly ISqliteConnection conn;
-
-	public SqliteSchema(ISqliteConnection conn) {
-		this.conn = conn;
-	}
-
-	public async Task<bool> Setup(ISchemaUpgradeCallbacks callbacks) {
+	public async Task<bool> Setup(ISqliteAttachedDatabaseCollector attachedDatabaseCollector, ISchemaUpgradeCallbacks callbacks) {
 		await conn.ExecuteAsync("CREATE TABLE IF NOT EXISTS metadata (key TEXT PRIMARY KEY, value TEXT)");
 		
-		var dbVersionStr = await conn.ExecuteReaderAsync("SELECT value FROM metadata WHERE key = 'version'", static reader => reader?.GetString(0));
+		string? dbVersionStr = await conn.ExecuteReaderAsync("SELECT value FROM metadata WHERE key = 'version'", static reader => reader?.GetString(0));
 		if (dbVersionStr == null) {
+			if (await callbacks.GetInitialDatabaseSettings() is {} initialSettings) {
+				await ApplyInitialSettings(initialSettings);
+				await AttachAdditionalDatabasesIfNecessary(attachedDatabaseCollector);
+			}
+			
 			await InitializeSchemas();
 		}
 		else if (!int.TryParse(dbVersionStr, out int dbVersion) || dbVersion < 1) {
@@ -32,17 +36,49 @@ sealed class SqliteSchema {
 			throw new DatabaseTooNewException(dbVersion);
 		}
 		else if (dbVersion < Version) {
-			var proceed = await callbacks.CanUpgrade();
+			bool proceed = await callbacks.CanUpgrade();
 			if (!proceed) {
 				return false;
 			}
 			
+			await AttachAdditionalDatabasesIfNecessary(attachedDatabaseCollector);
 			await callbacks.Start(Version - dbVersion, async reporter => await UpgradeSchemas(dbVersion, reporter));
 		}
 		
 		return true;
 	}
 	
+	private async Task ApplyInitialSettings(InitialDatabaseSettings initialSettings) {
+		await using var cmd = conn.Command("INSERT INTO metadata (key, value) VALUES (:key, :value)");
+		cmd.Add("key", SqliteType.Text);
+		cmd.Add("value", SqliteType.Text);
+		
+		static async Task ApplySetting<T>(SqliteCommand cmd, SettingsKey<T> key, T value) {
+			cmd.Set("key", key.Key);
+			cmd.Set("value", key.ToString(value));
+			await cmd.ExecuteNonQueryAsync();
+		}
+		
+		if (initialSettings.SeparateFileForDownloads) {
+			await ApplySetting(cmd, SettingsKey.SeparateFileForDownloads, value: true);
+		}
+		
+		if (initialSettings.DownloadsAutoStart) {
+			await ApplySetting(cmd, SettingsKey.DownloadsAutoStart, value: true);
+		}
+	}
+	
+	[SuppressMessage("ReSharper", "WithExpressionModifiesAllMembers")]
+	private async Task AttachAdditionalDatabasesIfNecessary(ISqliteAttachedDatabaseCollector attachedDatabaseCollector) {
+		await foreach (var attachedDatabase in attachedDatabaseCollector.GetAttachedDatabases(conn)) {
+			if (!File.Exists(attachedDatabase.Path)) {
+				await using CustomSqliteConnection _ = await CustomSqliteConnection.OpenUnpooled(conn.ConnectionStringFactory with { Path = attachedDatabase.Path });
+			}
+			
+			await conn.AttachDatabase(attachedDatabase);
+		}
+	}
+	
 	private async Task InitializeSchemas() {
 		await conn.ExecuteAsync("""
 		                        CREATE TABLE users (
@@ -100,7 +136,8 @@ sealed class SqliteSchema {
 		await conn.ExecuteAsync("""
 		                        CREATE TABLE message_embeds (
 		                        	message_id INTEGER NOT NULL,
-		                        	json       TEXT NOT NULL
+		                        	json       TEXT NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
 		                        )
 		                        """);
 		
@@ -110,12 +147,27 @@ sealed class SqliteSchema {
 		                        	emoji_id    INTEGER,
 		                        	emoji_name  TEXT,
 		                        	emoji_flags INTEGER NOT NULL,
-		                        	count       INTEGER NOT NULL
+		                        	count       INTEGER NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+		
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_edit_timestamps (
+		                        	message_id     INTEGER PRIMARY KEY NOT NULL,
+		                        	edit_timestamp INTEGER NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+		
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_replied_to (
+		                        	message_id    INTEGER PRIMARY KEY NOT NULL,
+		                        	replied_to_id INTEGER NOT NULL,
+		                        	FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE
 		                        )
 		                        """);
 		
-		await CreateMessageEditTimestampTable(conn);
-		await CreateMessageRepliedToTable(conn);
 		await CreateDownloadTables(conn);
 		await CreateMessageAttachmentsTable(conn);
 		
@@ -125,27 +177,11 @@ sealed class SqliteSchema {
 		await conn.ExecuteAsync("INSERT INTO metadata (key, value) VALUES ('version', " + Version + ")");
 	}
 	
-	internal static async Task CreateMessageEditTimestampTable(ISqliteConnection conn) {
-		await conn.ExecuteAsync("""
-		                        CREATE TABLE message_edit_timestamps (
-		                        	message_id     INTEGER PRIMARY KEY NOT NULL,
-		                        	edit_timestamp INTEGER NOT NULL
-		                        )
-		                        """);
-	}
-
-	internal static async Task CreateMessageRepliedToTable(ISqliteConnection conn) {
-		await conn.ExecuteAsync("""
-		                        CREATE TABLE message_replied_to (
-		                        	message_id    INTEGER PRIMARY KEY NOT NULL,
-		                        	replied_to_id INTEGER NOT NULL
-		                        )
-		                        """);
-	}
-
 	internal static async Task CreateDownloadTables(ISqliteConnection conn) {
-		await conn.ExecuteAsync("""
-		                        CREATE TABLE download_metadata (
+		string schema = conn.HasAttachedDatabase(SqliteDownloadRepository.Schema) ? SqliteDownloadRepository.Schema : "main";
+		
+		await conn.ExecuteAsync($"""
+		                         CREATE TABLE {schema}.download_metadata (
 		                         	normalized_url TEXT NOT NULL PRIMARY KEY,
 		                         	download_url   TEXT NOT NULL,
 		                         	status         INTEGER NOT NULL,
@@ -154,8 +190,8 @@ sealed class SqliteSchema {
 		                         )
 		                         """);
 		
-		await conn.ExecuteAsync("""
-		                        CREATE TABLE download_blobs (
+		await conn.ExecuteAsync($"""
+		                         CREATE TABLE {schema}.download_blobs (
 		                         	normalized_url TEXT NOT NULL PRIMARY KEY,
 		                         	blob           BLOB NOT NULL,
 		                         	FOREIGN KEY (normalized_url) REFERENCES download_metadata (normalized_url) ON UPDATE CASCADE ON DELETE CASCADE
@@ -185,14 +221,15 @@ sealed class SqliteSchema {
 			{ 6, new SqliteSchemaUpgradeTo7() },
 			{ 7, new SqliteSchemaUpgradeTo8() },
 			{ 8, new SqliteSchemaUpgradeTo9() },
+			{ 9, new SqliteSchemaUpgradeTo10() },
 		};
 		
-		var perf = Log.Start("from version " + dbVersion);
+		Perf perf = Log.Start("from version " + dbVersion);
 		
 		for (int fromVersion = dbVersion; fromVersion < Version; fromVersion++) {
-			var toVersion = fromVersion + 1;
+			int toVersion = fromVersion + 1;
 			
-			if (upgrades.TryGetValue(fromVersion, out var upgrade)) {
+			if (upgrades.TryGetValue(fromVersion, out ISchemaUpgrade? upgrade)) {
 				await upgrade.Run(conn, reporter);
 			}
 			

app/Server/Database/Sqlite/Utils/AttachedDatabase.cs

@@ -0,0 +1,3 @@
+namespace DHT.Server.Database.Sqlite.Utils;
+
+sealed record AttachedDatabase(string Path, string Schema);

app/Server/Database/Sqlite/Utils/CustomSqliteConnection.cs

@@ -0,0 +1,91 @@
+using System;
+using System.Collections.Immutable;
+using System.Data.Common;
+using System.Diagnostics.CodeAnalysis;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Data.Sqlite;
+
+namespace DHT.Server.Database.Sqlite.Utils;
+
+class CustomSqliteConnection : ISqliteConnection {
+	internal static async Task<CustomSqliteConnection> OpenUnpooled(SqliteConnectionStringFactory connectionStringFactory) {
+		SqliteConnection conn = new SqliteConnection(connectionStringFactory.Create());
+		await conn.OpenAsync();
+		
+		CustomSqliteConnection custom = new CustomSqliteConnection(connectionStringFactory, conn);
+		await custom.Setup(CancellationToken.None);
+		
+		return custom;
+	}
+	
+	internal SqliteConnectionStringFactory ConnectionStringFactory { get; }
+	public SqliteConnection InnerConnection { get; }
+	
+	private ImmutableHashSet<string> attachedDatabases = [];
+	private DbTransaction? activeTransaction;
+	
+	protected CustomSqliteConnection(SqliteConnectionStringFactory connectionStringFactory, SqliteConnection innerConnection) {
+		this.ConnectionStringFactory = connectionStringFactory;
+		this.InnerConnection = innerConnection;
+	}
+	
+	internal async Task Setup(CancellationToken cancellationToken) {
+		await this.ExecuteAsync("PRAGMA journal_mode=WAL", cancellationToken);
+		await this.ExecuteAsync("PRAGMA foreign_keys=ON", cancellationToken);
+	}
+	
+	[SuppressMessage("ReSharper", "WithExpressionModifiesAllMembers")]
+	internal async Task AttachDatabase(AttachedDatabase attachedDatabase) {
+		await this.ExecuteAsync("ATTACH DATABASE '" + attachedDatabase.Path.Replace("'", "''") + "' AS " + attachedDatabase.Schema);
+		ImmutableInterlocked.Update(ref attachedDatabases, static (set, schema) => set.Add(schema), attachedDatabase.Schema);
+	}
+	
+	public bool HasAttachedDatabase(string schema) {
+		return attachedDatabases.Contains(schema);
+	}
+	
+	public async Task BeginTransactionAsync() {
+		if (activeTransaction != null) {
+			throw new InvalidOperationException("A transaction is already active.");
+		}
+		
+		activeTransaction = await InnerConnection.BeginTransactionAsync();
+	}
+	
+	public async Task CommitTransactionAsync() {
+		if (activeTransaction == null) {
+			throw new InvalidOperationException("No active transaction to commit.");
+		}
+		
+		await activeTransaction.CommitAsync();
+		await activeTransaction.DisposeAsync();
+		activeTransaction = null;
+	}
+	
+	public async Task RollbackTransactionAsync() {
+		if (activeTransaction == null) {
+			throw new InvalidOperationException("No active transaction to rollback.");
+		}
+		
+		await activeTransaction.RollbackAsync();
+		await activeTransaction.DisposeAsync();
+		activeTransaction = null;
+	}
+	
+	public void AssignActiveTransaction(SqliteCommand command) {
+		command.Transaction = (SqliteTransaction?) activeTransaction;
+	}
+	
+	public async ValueTask DisposeAsync() {
+		if (activeTransaction != null) {
+			await RollbackTransactionAsync();
+		}
+		
+		await DisposeConnection();
+	}
+	
+	private protected virtual async ValueTask DisposeConnection() {
+		await InnerConnection.DisposeAsync();
+	}
+}

app/Server/Database/Sqlite/Utils/ISqliteAttachedDatabaseCollector.cs

@@ -0,0 +1,7 @@
+using System.Collections.Generic;
+
+namespace DHT.Server.Database.Sqlite.Utils;
+
+interface ISqliteAttachedDatabaseCollector {
+	IAsyncEnumerable<AttachedDatabase> GetAttachedDatabases(ISqliteConnection conn);
+}

app/Server/Database/Sqlite/Utils/ISqliteConnection.cs

@@ -7,6 +7,8 @@ namespace DHT.Server.Database.Sqlite.Utils;
 interface ISqliteConnection : IAsyncDisposable {
 	SqliteConnection InnerConnection { get; }
 	
+	bool HasAttachedDatabase(string schema);
+	
 	Task BeginTransactionAsync();
 	Task CommitTransactionAsync();
 	Task RollbackTransactionAsync();

app/Server/Database/Sqlite/Utils/InitialDatabaseSettings.cs

@@ -0,0 +1,3 @@
+namespace DHT.Server.Database.Sqlite.Utils;
+
+public sealed record InitialDatabaseSettings(bool SeparateFileForDownloads, bool DownloadsAutoStart);

app/Server/Database/Sqlite/Utils/SqliteConnectionPool.cs

@@ -1,6 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.Data.Common;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using DHT.Utils.Collections;
@@ -9,16 +9,13 @@ using Microsoft.Data.Sqlite;
 namespace DHT.Server.Database.Sqlite.Utils;
 
 sealed class SqliteConnectionPool : IAsyncDisposable {
-	public static async Task<SqliteConnectionPool> Create(SqliteConnectionStringBuilder connectionStringBuilder, int poolSize) {
-		var pool = new SqliteConnectionPool(poolSize);
-		await pool.InitializePooledConnections(connectionStringBuilder);
+	public static async Task<SqliteConnectionPool> Create(SqliteConnectionStringFactory connectionStringFactory, int poolSize, ISqliteAttachedDatabaseCollector attachedDatabaseCollector) {
+		SqliteConnectionPool pool = new SqliteConnectionPool(poolSize, attachedDatabaseCollector);
+		await pool.InitializePooledConnections(connectionStringFactory);
 		return pool;
 	}
 	
-	private static string GetConnectionString(SqliteConnectionStringBuilder connectionStringBuilder) {
-		connectionStringBuilder.Pooling = false;
-		return connectionStringBuilder.ToString();
-	}
+	private readonly ISqliteAttachedDatabaseCollector attachedDatabaseCollector;
 	
 	private readonly int poolSize;
 	private readonly List<PooledConnection> all;
@@ -27,24 +24,35 @@ sealed class SqliteConnectionPool : IAsyncDisposable {
 	private readonly CancellationTokenSource disposalTokenSource = new ();
 	private readonly CancellationToken disposalToken;
 	
-	private SqliteConnectionPool(int poolSize) {
+	private SqliteConnectionPool(int poolSize, ISqliteAttachedDatabaseCollector attachedDatabaseCollector) {
+		this.attachedDatabaseCollector = attachedDatabaseCollector;
+		
 		this.poolSize = poolSize;
 		this.all = new List<PooledConnection>(poolSize);
 		this.free = new ConcurrentPool<PooledConnection>(poolSize);
+		
 		this.disposalToken = disposalTokenSource.Token;
 	}
 	
-	private async Task InitializePooledConnections(SqliteConnectionStringBuilder connectionStringBuilder) {
-		var connectionString = GetConnectionString(connectionStringBuilder);
+	private async Task InitializePooledConnections(SqliteConnectionStringFactory connectionStringFactory) {
+		string connectionString = connectionStringFactory.Create();
+		
+		List<AttachedDatabase> attachedDatabases = [];
 		
 		for (int i = 0; i < poolSize; i++) {
-			var conn = new SqliteConnection(connectionString);
-			conn.Open();
+			SqliteConnection innerConnection = new SqliteConnection(connectionString);
+			await innerConnection.OpenAsync(disposalToken);
 			
-			var pooledConnection = new PooledConnection(this, conn);
+			PooledConnection pooledConnection = new PooledConnection(this, connectionStringFactory, innerConnection);
+			await pooledConnection.Setup(disposalToken);
 			
-			await pooledConnection.ExecuteAsync("PRAGMA journal_mode=WAL", disposalToken);
-			await pooledConnection.ExecuteAsync("PRAGMA foreign_keys=ON", disposalToken);
+			if (i == 0) {
+				attachedDatabases = await attachedDatabaseCollector.GetAttachedDatabases(pooledConnection).ToListAsync(disposalToken);
+			}
+			
+			foreach (var attachedDatabase in attachedDatabases) {
+				await pooledConnection.AttachDatabase(attachedDatabase);
+			}
 			
 			all.Add(pooledConnection);
 			await free.Push(pooledConnection, disposalToken);
@@ -66,7 +74,7 @@ sealed class SqliteConnectionPool : IAsyncDisposable {
 		
 		await disposalTokenSource.CancelAsync();
 		
-		foreach (var conn in all) {
+		foreach (PooledConnection conn in all) {
 			await conn.InnerConnection.CloseAsync();
 			await conn.InnerConnection.DisposeAsync();
 		}
@@ -74,48 +82,8 @@ sealed class SqliteConnectionPool : IAsyncDisposable {
 		disposalTokenSource.Dispose();
 	}
 	
-	private sealed class PooledConnection(SqliteConnectionPool pool, SqliteConnection conn) : ISqliteConnection {
-		public SqliteConnection InnerConnection { get; } = conn;
-
-		private DbTransaction? activeTransaction;
-
-		public async Task BeginTransactionAsync() {
-			if (activeTransaction != null) {
-				throw new InvalidOperationException("A transaction is already active.");
-			}
-			
-			activeTransaction = await InnerConnection.BeginTransactionAsync();
-		}
-
-		public async Task CommitTransactionAsync() {
-			if (activeTransaction == null) {
-				throw new InvalidOperationException("No active transaction to commit.");
-			}
-
-			await activeTransaction.CommitAsync();
-			await activeTransaction.DisposeAsync();
-			activeTransaction = null;
-		}
-
-		public async Task RollbackTransactionAsync() {
-			if (activeTransaction == null) {
-				throw new InvalidOperationException("No active transaction to rollback.");
-			}
-			
-			await activeTransaction.RollbackAsync();
-			await activeTransaction.DisposeAsync();
-			activeTransaction = null;
-		}
-
-		public void AssignActiveTransaction(SqliteCommand command) {
-			command.Transaction = (SqliteTransaction?) activeTransaction;
-		}
-
-		public async ValueTask DisposeAsync() {
-			if (activeTransaction != null) {
-				await RollbackTransactionAsync();
-			}
-			
+	private sealed class PooledConnection(SqliteConnectionPool pool, SqliteConnectionStringFactory connectionStringFactory, SqliteConnection innerConnection) : CustomSqliteConnection(connectionStringFactory, innerConnection) {
+		private protected override async ValueTask DisposeConnection() {
 			await pool.Return(this);
 		}
 	}

app/Server/Database/Sqlite/Utils/SqliteConnectionStringFactory.cs

@@ -0,0 +1,15 @@
+using Microsoft.Data.Sqlite;
+
+namespace DHT.Server.Database.Sqlite.Utils;
+
+sealed record SqliteConnectionStringFactory(string Path) {
+	public string Create() {
+		var builder = new SqliteConnectionStringBuilder {
+			DataSource = Path,
+			Mode = SqliteOpenMode.ReadWriteCreate,
+			Pooling = false,
+		};
+		
+		return builder.ToString();
+	}
+}

app/Server/Database/Sqlite/Utils/SqliteExtensions.cs

@@ -31,8 +31,8 @@ static class SqliteExtensions {
 	}
 	
 	public static SqliteCommand Insert(this ISqliteConnection conn, string tableName, (string Name, SqliteType Type)[] columns) {
-		string columnNames = string.Join(',', columns.Select(static c => c.Name));
-		string columnParams = string.Join(',', columns.Select(static c => ':' + c.Name));
+		string columnNames = string.Join(separator: ',', columns.Select(static c => c.Name));
+		string columnParams = string.Join(separator: ',', columns.Select(static c => ':' + c.Name));
 		
 		var cmd = conn.Command("INSERT INTO " + tableName + " (" + columnNames + ")" +
 		                       "VALUES (" + columnParams + ")");
@@ -42,9 +42,9 @@ static class SqliteExtensions {
 	}
 	
 	public static SqliteCommand Upsert(this ISqliteConnection conn, string tableName, (string Name, SqliteType Type)[] columns) {
-		string columnNames = string.Join(',', columns.Select(static c => c.Name));
-		string columnParams = string.Join(',', columns.Select(static c => ':' + c.Name));
-		string columnUpdates = string.Join(',', columns.Skip(1).Select(static c => c.Name + " = excluded." + c.Name));
+		string columnNames = string.Join(separator: ',', columns.Select(static c => c.Name));
+		string columnParams = string.Join(separator: ',', columns.Select(static c => ':' + c.Name));
+		string columnUpdates = string.Join(separator: ',', columns.Skip(1).Select(static c => c.Name + " = excluded." + c.Name));
 		
 		var cmd = conn.Command("INSERT INTO " + tableName + " (" + columnNames + ")" +
 		                       "VALUES (" + columnParams + ")" +
@@ -62,7 +62,7 @@ static class SqliteExtensions {
 	}
 	
 	private static void CreateParameters(SqliteCommand cmd, (string Name, SqliteType Type)[] columns) {
-		foreach (var (name, type) in columns) {
+		foreach ((string name, SqliteType type) in columns) {
 			cmd.Parameters.Add(":" + name, type);
 		}
 	}

app/Server/Download/DiscordCdn.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Frozen;
+using System.Collections.Specialized;
 using System.Diagnostics.CodeAnalysis;
 using System.Web;
 
@@ -9,7 +10,7 @@ static class DiscordCdn {
 	private static FrozenSet<string> CdnHosts { get; } = new[] {
 		"cdn.discordapp.com",
 		"cdn.discord.com",
-		"media.discordapp.net"
+		"media.discordapp.net",
 	}.ToFrozenSet();
 	
 	private static bool IsCdnUrl(string originalUrl, [NotNullWhen(true)] out Uri? uri) {
@@ -17,11 +18,11 @@ static class DiscordCdn {
 	}
 	
 	public static string NormalizeUrl(string originalUrl) {
-		return IsCdnUrl(originalUrl, out var uri) ? DoNormalize(uri) : originalUrl;
+		return IsCdnUrl(originalUrl, out Uri? uri) ? DoNormalize(uri) : originalUrl;
 	}
 	
 	public static bool NormalizeUrlAndReturnIfCdn(string originalUrl, out string normalizedUrl) {
-		if (IsCdnUrl(originalUrl, out var uri)) {
+		if (IsCdnUrl(originalUrl, out Uri? uri)) {
 			normalizedUrl = DoNormalize(uri);
 			return true;
 		}
@@ -32,7 +33,7 @@ static class DiscordCdn {
 	}
 	
 	private static string DoNormalize(Uri uri) {
-		var query = HttpUtility.ParseQueryString(uri.Query);
+		NameValueCollection query = HttpUtility.ParseQueryString(uri.Query);
 		
 		query.Remove("ex");
 		query.Remove("is");

app/Server/Download/DownloadExporter.cs

@@ -0,0 +1,152 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using DHT.Server.Data;
+using DHT.Server.Data.Filters;
+using DHT.Server.Database;
+using DHT.Utils.Logging;
+using DHT.Utils.Tasks;
+using Channel = System.Threading.Channels.Channel;
+
+namespace DHT.Server.Download;
+
+public sealed partial class DownloadExporter(IDatabaseFile db, string folderPath) {
+	private static readonly Log Log = Log.ForType<DownloadExporter>();
+	
+	private const int Concurrency = 3;
+	
+	private static Channel<Data.Download> CreateExportChannel() {
+		return Channel.CreateBounded<Data.Download>(new BoundedChannelOptions(Concurrency * 4) {
+			SingleWriter = true,
+			SingleReader = false,
+			AllowSynchronousContinuations = true,
+			FullMode = BoundedChannelFullMode.Wait,
+		});
+	}
+	
+	public interface IProgressReporter {
+		Task ReportProgress(long processedCount, long totalCount);
+	}
+	
+	public readonly record struct Result(long SuccessfulCount, long FailedCount) {
+		internal static Result Combine(Result left, Result right) {
+			return new Result(left.SuccessfulCount + right.SuccessfulCount, left.FailedCount + right.FailedCount);
+		}
+	}
+	
+	public async Task<Result> Export(IProgressReporter reporter) {
+		DownloadItemFilter filter = new DownloadItemFilter {
+			IncludeStatuses = [DownloadStatus.Success]
+		};
+		
+		long totalCount = await db.Downloads.Count(filter);
+		
+		Channel<Data.Download> channel = CreateExportChannel();
+		ExportRunner exportRunner = new ExportRunner(db, folderPath, channel.Reader, reporter, totalCount);
+		
+		using CancellableTask progressTask = CancellableTask.Run(exportRunner.RunReportTask);
+		
+		List<Task<Result>> readerTasks = [];
+		for (int reader = 0; reader < Concurrency; reader++) {
+			readerTasks.Add(Task.Run(exportRunner.RunExportTask, CancellationToken.None));
+		}
+		
+		await foreach (Data.Download download in db.Downloads.Get(filter).WithCancellation(CancellationToken.None)) {
+			await channel.Writer.WriteAsync(download, CancellationToken.None);
+		}
+		
+		channel.Writer.Complete();
+		
+		Result result = (await Task.WhenAll(readerTasks)).Aggregate(Result.Combine);
+		
+		progressTask.Cancel();
+		await progressTask.Task;
+		
+		return result;
+	}
+	
+	private sealed partial class ExportRunner(IDatabaseFile db, string folderPath, ChannelReader<Data.Download> reader, IProgressReporter reporter, long totalCount) {
+		private long processedCount;
+		
+		public async Task RunReportTask(CancellationToken cancellationToken) {
+			try {
+				while (true) {
+					await reporter.ReportProgress(processedCount, totalCount);
+					await Task.Delay(TimeSpan.FromMilliseconds(25), cancellationToken);
+				}
+			} catch (OperationCanceledException) {
+				await reporter.ReportProgress(processedCount, totalCount);
+			}
+		}
+		
+		public async Task<Result> RunExportTask() {
+			long successfulCount = 0L;
+			long failedCount = 0L;
+			
+			await foreach (Data.Download download in reader.ReadAllAsync()) {
+				bool success;
+				try {
+					success = await db.Downloads.GetDownloadData(download.NormalizedUrl, stream => CopyToFile(download.NormalizedUrl, stream));
+				} catch (FileAlreadyExistsException) {
+					success = false;
+				} catch (Exception e) {
+					Log.Error(e);
+					success = false;
+				}
+				
+				if (success) {
+					++successfulCount;
+				}
+				else {
+					++failedCount;
+				}
+				
+				Interlocked.Increment(ref processedCount);
+			}
+			
+			return new Result(successfulCount, failedCount);
+		}
+		
+		private async Task CopyToFile(string normalizedUrl, Stream blobStream) {
+			string fileName = UrlToFileName(normalizedUrl);
+			string filePath = Path.Combine(folderPath, fileName);
+			
+			if (File.Exists(filePath)) {
+				Log.Error("Skipping existing file: " + fileName);
+				throw FileAlreadyExistsException.Instance;
+			}
+			
+			await using var fileStream = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
+			await blobStream.CopyToAsync(fileStream);
+		}
+		
+		[GeneratedRegex("[^a-zA-Z0-9_.-]")]
+		private static partial Regex DisallowedFileNameCharactersRegex();
+		
+		private static string UrlToFileName(string url) {
+			static string UriToFileName(Uri uri) {
+				string fileName = uri.AbsolutePath.TrimStart('/');
+				
+				if (uri.Query.Length > 0) {
+					int periodIndex = fileName.LastIndexOf('.');
+					return fileName.Insert(periodIndex == -1 ? fileName.Length : periodIndex, uri.Query.TrimEnd('&'));
+				}
+				else {
+					return fileName;
+				}
+			}
+			
+			string fileName = Uri.TryCreate(url, UriKind.Absolute, out var uri) ? UriToFileName(uri) : url;
+			return DisallowedFileNameCharactersRegex().Replace(fileName, "_");
+		}
+	}
+	
+	private sealed class FileAlreadyExistsException : Exception {
+		public static FileAlreadyExistsException Instance { get; } = new ();
+	}
+}

app/Server/Download/DownloadItem.cs

@@ -11,11 +11,11 @@ public readonly struct DownloadItem {
 	public ulong? Size { get; init; }
 	
 	internal Data.Download ToSuccess(long size) {
-		return new Data.Download(NormalizedUrl, DownloadUrl, DownloadStatus.Success, Type, (ulong) Math.Max(size, 0));
+		return new Data.Download(NormalizedUrl, DownloadUrl, DownloadStatus.Success, Type, (ulong) Math.Max(size, val2: 0));
 	}
 	
 	internal Data.Download ToFailure(HttpStatusCode? statusCode = null) {
-		var status = statusCode.HasValue ? (DownloadStatus) (int) statusCode : DownloadStatus.GenericError;
+		DownloadStatus status = statusCode.HasValue ? (DownloadStatus) (int) statusCode : DownloadStatus.GenericError;
 		return new Data.Download(NormalizedUrl, DownloadUrl, status, Type, Size);
 	}
 }