Release v44.0

Closes #165

app/Desktop/Common/SystemUtils.cs

@@ -0,0 +1,9 @@
+using System.Diagnostics;
+
+namespace DHT.Desktop.Common;
+
+static class SystemUtils {
+	public static void OpenUrl(string url) {
+		Process.Start(new ProcessStartInfo(url) { UseShellExecute = true });
+	}
+}

app/Desktop/Desktop.csproj

@@ -15,14 +15,14 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.0.6" />
+    <PackageReference Include="Avalonia" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.6" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.6" />
+    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.0.6" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.6" Condition=" '$(Configuration)' == 'Debug' " />
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.11" Condition=" '$(Configuration)' == 'Debug' " />
-    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.6" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.11" />
-    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.6" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.11" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.6" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.11" />
     <PackageReference Include="CommunityToolkit.Mvvm" Version="999.0.0-build.0.g0d941a6a62" />
   </ItemGroup>
   

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="295"
+        mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="360"
         x:Class="DHT.Desktop.Main.AboutWindow"
         x:DataType="main:AboutWindowModel"
         Title="About Discord History Tracker"
         Icon="avares://DiscordHistoryTracker/Resources/icon.ico"
-        Width="480" Height="295" CanResize="False"
+        Width="480" Height="360" CanResize="False"
         WindowStartupLocation="CenterOwner">
 
     <Design.DataContext>
@@ -39,10 +39,11 @@
 
         <StackPanel>
             <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" ColumnDefinitions="175,125,*" Margin="0 10 0 0">
+        <Grid RowDefinitions="Auto,5,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="175,125,*" 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>
@@ -55,13 +56,21 @@
             <TextBlock Grid.Row="3" Grid.Column="1">MIT</TextBlock>
             <Button Grid.Row="3" Grid.Column="2" Command="{Binding ShowLibraryAvalonia}">NuGet</Button>
 
-            <TextBlock Grid.Row="4" Grid.Column="0">SQLite</TextBlock>
+            <TextBlock Grid.Row="4" Grid.Column="0">MVVM Toolkit</TextBlock>
-            <TextBlock Grid.Row="4" Grid.Column="1">Public Domain</TextBlock>
+            <TextBlock Grid.Row="4" Grid.Column="1">MIT</TextBlock>
-            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibrarySqlite}">Official Website</Button>
+            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibraryCommunityToolkit}">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>
 
-            <TextBlock Grid.Row="5" Grid.Column="0">Microsoft.Data.Sqlite</TextBlock>
+            <TextBlock Grid.Row="6" Grid.Column="0">Microsoft.Data.Sqlite</TextBlock>
-            <TextBlock Grid.Row="5" Grid.Column="1">Apache-2.0</TextBlock>
+            <TextBlock Grid.Row="6" Grid.Column="1">Apache-2.0</TextBlock>
-            <Button Grid.Row="5" Grid.Column="2" Command="{Binding ShowLibrarySqliteAdoNet}">NuGet</Button>
+            <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="1">MIT</TextBlock>
+            <Button Grid.Row="7" Grid.Column="2" Command="{Binding ShowLibraryRxNet}">GitHub</Button>
         </Grid>
 
     </StackPanel>

app/Desktop/Main/AboutWindowModel.cs

@@ -1,33 +1,41 @@
-using System.Diagnostics;
+using DHT.Desktop.Common;
 
 namespace DHT.Desktop.Main;
 
 sealed class AboutWindowModel {
 	public void ShowOfficialWebsite() {
-		OpenUrl("https://dht.chylex.com");
+		SystemUtils.OpenUrl(Program.Website);
 	}
 
+	public void ShowIssueTracker() {
+		SystemUtils.OpenUrl("https://github.com/chylex/Discord-History-Tracker/issues");
+	}
+	
 	public void ShowSourceCode() {
-		OpenUrl("https://github.com/chylex/Discord-History-Tracker");
+		SystemUtils.OpenUrl("https://github.com/chylex/Discord-History-Tracker");
-	}
-
-	public void ShowLibraryAvalonia() {
-		OpenUrl("https://www.nuget.org/packages/Avalonia");
-	}
-
-	public void ShowLibrarySqlite() {
-		OpenUrl("https://www.sqlite.org");
-	}
-
-	public void ShowLibrarySqliteAdoNet() {
-		OpenUrl("https://www.nuget.org/packages/Microsoft.Data.Sqlite");
 	}
 
 	public void ShowLibraryNetCore() {
-		OpenUrl("https://github.com/dotnet/core");
+		SystemUtils.OpenUrl("https://github.com/dotnet/core");
 	}
 
-	private static void OpenUrl(string url) {
+	public void ShowLibraryAvalonia() {
-		Process.Start(new ProcessStartInfo { FileName = url, UseShellExecute = true });
+		SystemUtils.OpenUrl("https://www.nuget.org/packages/Avalonia");
+	}
+
+	public void ShowLibraryCommunityToolkit() {
+		SystemUtils.OpenUrl("https://github.com/CommunityToolkit/dotnet");
+	}
+
+	public void ShowLibrarySqlite() {
+		SystemUtils.OpenUrl("https://www.sqlite.org");
+	}
+
+	public void ShowLibrarySqliteAdoNet() {
+		SystemUtils.OpenUrl("https://www.nuget.org/packages/Microsoft.Data.Sqlite");
+	}
+
+	public void ShowLibraryRxNet() {
+		SystemUtils.OpenUrl("https://github.com/dotnet/reactive");
 	}
 }

app/Desktop/Main/Controls/DownloadItemFilterPanelModel.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Linq;
 using System.Reactive.Linq;
 using System.Threading.Tasks;
 using Avalonia.ReactiveUI;
@@ -8,13 +9,17 @@ 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;
 
 namespace DHT.Desktop.Main.Controls;
 
-sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposable {
+sealed partial class DownloadItemFilterPanelModel : ObservableObject, 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),
@@ -33,7 +38,7 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 	private bool limitSize = false;
 	
 	[ObservableProperty]
-	private ulong maximumSize = 0L;
+	private ulong maximumSize = 0UL;
 	
 	[ObservableProperty]
 	private Unit maximumSizeUnit = AllUnits[0];
@@ -43,6 +48,9 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 	private readonly State state;
 	private readonly string verb;
 
+	private readonly DelayedThrottledTask<FilterSettings> saveFilterSettingsTask;
+	private bool isLoadingFilterSettings;
+
 	private readonly RestartableTask<long> downloadItemCountTask;
 	private long? matchingItemCount;
 	
@@ -56,6 +64,8 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 		this.state = state;
 		this.verb = verb;
 
+		this.saveFilterSettingsTask = new DelayedThrottledTask<FilterSettings>(Log, TimeSpan.FromSeconds(5), SaveFilterSettings);
+
 		this.downloadItemCountTask = new RestartableTask<long>(SetMatchingCount, TaskScheduler.FromCurrentSynchronizationContext());
 		this.downloadItemCountSubscription = state.Db.Downloads.TotalCount.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnDownloadItemCountChanged);
 
@@ -64,13 +74,51 @@ sealed partial class DownloadItemFilterPanelModel : ObservableObject, IDisposabl
 		PropertyChanged += OnPropertyChanged;
 	}
 
-	public void Dispose() {
+	public async Task Initialize() {
+		isLoadingFilterSettings = true;
+		
+		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) {
+			MaximumSizeUnit = unitValue;
+		}
+		
+		isLoadingFilterSettings = false;
+	}
+
+	public async ValueTask DisposeAsync() {
+		saveFilterSettingsTask.Dispose();
+		
 		downloadItemCountTask.Cancel();
 		downloadItemCountSubscription.Dispose();
+		
+		await SaveFilterSettings(new FilterSettings(this));
+	}
+	
+	private sealed record FilterSettings(bool LimitSize, ulong MaximumSize, Unit MaximumSizeUnit) {
+		public FilterSettings(DownloadItemFilterPanelModel model) : this(model.LimitSize, model.MaximumSize, model.MaximumSizeUnit) {}
+	}
+	
+	private async Task SaveFilterSettings(FilterSettings settings) {
+		try {
+			await state.Db.Settings.Set(async setter => {
+				await setter.Set(SettingsKey.DownloadsLimitSize, settings.LimitSize);
+				await setter.Set(SettingsKey.DownloadsMaximumSize, settings.MaximumSize);
+				await setter.Set(SettingsKey.DownloadsMaximumSizeUnit, settings.MaximumSizeUnit.Name);
+			});
+		} catch (Exception e) {
+			Log.Error("Could not save download filter settings");
+			Log.Error(e);
+		}
 	}
 
 	private void OnPropertyChanged(object? sender, PropertyChangedEventArgs e) {
 		if (e.PropertyName != null && FilterProperties.Contains(e.PropertyName)) {
+			if (!isLoadingFilterSettings) {
+				saveFilterSettingsTask.Post(new FilterSettings(this));
+			}
+			
 			UpdateFilterStatistics();
 		}
 	}

app/Desktop/Main/MainWindowModel.cs

@@ -95,6 +95,8 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 		mainContentScreenModel = new MainContentScreenModel(window, state);
 		mainContentScreenModel.DatabaseClosed += MainContentScreenModelOnDatabaseClosed;
 		
+		await mainContentScreenModel.Initialize();
+		
 		Title = Path.GetFileName(state.Db.Path) + " - " + DefaultTitle;
 		CurrentScreen = new MainContentScreen { DataContext = mainContentScreenModel };
 
@@ -104,7 +106,7 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 	private async void MainContentScreenModelOnDatabaseClosed(object? sender, EventArgs e) {
 		if (mainContentScreenModel != null) {
 			mainContentScreenModel.DatabaseClosed -= MainContentScreenModelOnDatabaseClosed;
-			mainContentScreenModel.Dispose();
+			await mainContentScreenModel.DisposeAsync();
 			mainContentScreenModel = null;
 		}
 
@@ -124,7 +126,10 @@ sealed partial class MainWindowModel : ObservableObject, IAsyncDisposable {
 	}
 
 	public async ValueTask DisposeAsync() {
-		mainContentScreenModel?.Dispose();
+		if (mainContentScreenModel != null) {
+			await mainContentScreenModel.DisposeAsync();
+		}
+		
 		await DisposeState();
 	}
 }

app/Desktop/Main/Pages/DownloadsPage.axaml

@@ -31,8 +31,14 @@
     </UserControl.Styles>
 
     <StackPanel Orientation="Vertical" Spacing="20">
-        <Button Command="{Binding OnClickToggleDownload}" Content="{Binding ToggleDownloadButtonText}" IsEnabled="{Binding IsToggleDownloadButtonEnabled}" />
+        <StackPanel Orientation="Horizontal" Spacing="10">
+            <Button Command="{Binding OnClickToggleDownload}" Content="{Binding ToggleDownloadButtonText}" IsEnabled="{Binding IsToggleDownloadButtonEnabled}" />
+            <Button Command="{Binding OnClickRetryFailedDownloads}" IsEnabled="{Binding IsRetryFailedOnDownloadsButtonEnabled}">Retry Failed Downloads</Button>
+        </StackPanel>
         <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">
@@ -43,9 +49,6 @@
                     </DataGrid.Columns>
                 </DataGrid>
             </Expander>
-            <StackPanel Orientation="Horizontal" Spacing="10">
-                <Button Command="{Binding OnClickRetryFailedDownloads}" IsEnabled="{Binding IsRetryFailedOnDownloadsButtonEnabled}">Retry Failed Downloads</Button>
-            </StackPanel>
         </StackPanel>
     </StackPanel>
 </UserControl>

app/Desktop/Main/Pages/DownloadsPageModel.cs

@@ -9,13 +9,14 @@ using DHT.Desktop.Main.Controls;
 using DHT.Server;
 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;
 
 namespace DHT.Desktop.Main.Pages;
 
-sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
+sealed partial class DownloadsPageModel : ObservableObject, IAsyncDisposable {
 	private static readonly Log Log = Log.ForType<DownloadsPageModel>();
 
 	[ObservableProperty(Setter = Access.Private)]
@@ -73,14 +74,22 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 
 		RecomputeDownloadStatistics();
 	}
+	
+	public async Task Initialize() {
+		await FilterModel.Initialize();
+		
+		if (await state.Db.Settings.Get(SettingsKey.DownloadsAutoStart, false)) {
+			await StartDownload();
+		}
+	}
 
-	public void Dispose() {
+	public async ValueTask DisposeAsync() {
 		finishedItemsSubscription?.Dispose();
 		
 		downloadItemCountSubscription.Dispose();
 		downloadStatisticsTask.Dispose();
 
-		FilterModel.Dispose();
+		await FilterModel.DisposeAsync();
 	}
 
 	private void OnDownloadCountChanged(long newDownloadCount) {
@@ -91,26 +100,41 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 		IsToggleDownloadButtonEnabled = false;
 
 		if (IsDownloading) {
-			await state.Downloader.Stop();
+			await StopDownload();
-			await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
-
-			finishedItemsSubscription?.Dispose();
-			finishedItemsSubscription = null;
-			
-			currentDownloadFilter = null;
 		}
 		else {
-			await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
+			await StartDownload();
-			
-			var finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
-			finishedItemsSubscription = finishedItems.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnItemFinished);
 		}
 
+		await state.Db.Settings.Set(SettingsKey.DownloadsAutoStart, IsDownloading);
+		IsToggleDownloadButtonEnabled = true;
+	}
+
+	private async Task StartDownload() {
+		await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
+		
+		var finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
+		finishedItemsSubscription = finishedItems.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnItemFinished);
+		
+		OnDownloadStateChanged();
+	}
+
+	private async Task StopDownload() {
+		await state.Downloader.Stop();
+		await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
+
+		finishedItemsSubscription?.Dispose();
+		finishedItemsSubscription = null;
+			
+		currentDownloadFilter = null;
+		OnDownloadStateChanged();
+	}
+
+	private void OnDownloadStateChanged() {
 		RecomputeDownloadStatistics();
 
 		OnPropertyChanged(nameof(ToggleDownloadButtonText));
 		OnPropertyChanged(nameof(IsDownloading));
-		IsToggleDownloadButtonEnabled = true;
 	}
 
 	private void OnItemFinished(DownloadItem item) {

app/Desktop/Main/Pages/ViewerPageModel.cs

@@ -1,6 +1,5 @@
 using System;
 using System.ComponentModel;
-using System.Diagnostics;
 using System.Threading.Tasks;
 using System.Web;
 using Avalonia.Controls;
@@ -52,10 +51,7 @@ sealed partial class ViewerPageModel : ObservableObject, IDisposable {
 			string serverUrl = "http://127.0.0.1:" + ServerConfiguration.Port;
 			string serverToken = ServerConfiguration.Token;
 			string sessionId = state.ViewerSessions.Register(new ViewerSession(FilterModel.CreateFilter())).ToString();
-			
+			SystemUtils.OpenUrl(serverUrl + "/viewer/?token=" + HttpUtility.UrlEncode(serverToken) + "&session=" + HttpUtility.UrlEncode(sessionId));
-			Process.Start(new ProcessStartInfo(serverUrl + "/viewer/?token=" + HttpUtility.UrlEncode(serverToken) + "&session=" + HttpUtility.UrlEncode(sessionId)) {
-				UseShellExecute = true
-			});
 		} catch (Exception e) {
 			await Dialog.ShowOk(window, "Open Viewer", "Could not open viewer: " + e.Message);
 		}

app/Desktop/Main/Screens/MainContentScreenModel.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Avalonia.Controls;
 using DHT.Desktop.Main.Controls;
 using DHT.Desktop.Main.Pages;
@@ -6,7 +7,7 @@ using DHT.Server;
 
 namespace DHT.Desktop.Main.Screens;
 
-sealed class MainContentScreenModel : IDisposable {
+sealed class MainContentScreenModel : IAsyncDisposable {
 	public DatabasePage DatabasePage { get; }
 	private DatabasePageModel DatabasePageModel { get; }
 
@@ -70,9 +71,13 @@ sealed class MainContentScreenModel : IDisposable {
 
 		StatusBarModel = new StatusBarModel(state);
 	}
+	
+	public async Task Initialize() {
+		await DownloadsPageModel.Initialize();
+	}
 
-	public void Dispose() {
+	public async ValueTask DisposeAsync() {
-		DownloadsPageModel.Dispose();
+		await DownloadsPageModel.DisposeAsync();
 		ViewerPageModel.Dispose();
 		AdvancedPageModel.Dispose();
 		StatusBarModel.Dispose();

app/Desktop/Main/Screens/WelcomeScreen.axaml

@@ -22,20 +22,21 @@
             <Setter Property="HorizontalAlignment" Value="Center" />
             <Setter Property="VerticalAlignment" Value="Center" />
         </Style>
-        <Style Selector="Button">
+        <Style Selector="Grid#ButtonPanel > Button">
-            <Setter Property="Margin" Value="5 0" />
+            <Setter Property="HorizontalAlignment" Value="Stretch" />
         </Style>
     </UserControl.Styles>
 
     <Panel Name="RootPanel">
-        <StackPanel Margin="42">
+        <StackPanel Margin="42 30">
-            <TextBlock Text="{Binding Version, StringFormat=Discord History Tracker v{0}}" FontSize="25" Margin="0 0 0 30" HorizontalAlignment="Center" />
+            <TextBlock Text="{Binding Version, StringFormat=Discord History Tracker v{0}}" FontSize="25" Margin="0 0 0 25" HorizontalAlignment="Center" />
-
+            
-            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
+            <Grid Name="ButtonPanel" RowDefinitions="Auto,12,Auto,12,Auto" ColumnDefinitions="*,12,*" Margin="12 0" HorizontalAlignment="Stretch">
-                <Button Command="{Binding OpenOrCreateDatabase}" IsEnabled="{Binding IsOpenOrCreateDatabaseButtonEnabled}">Open or Create Database</Button>
+                <Button Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3" Command="{Binding OpenOrCreateDatabase}" IsEnabled="{Binding IsOpenOrCreateDatabaseButtonEnabled}">Open or Create Database</Button>
-                <Button Command="{Binding ShowAboutDialog}">About</Button>
+                <Button Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="3" Command="{Binding CheckUpdates}">Check For Updates</Button>
-                <Button Command="{Binding Exit}">Exit</Button>
+                <Button Grid.Row="4" Grid.Column="0" Command="{Binding ShowAboutDialog}">About</Button>
-            </StackPanel>
+                <Button Grid.Row="4" Grid.Column="2" Command="{Binding Exit}">Exit</Button>
+            </Grid>
         </StackPanel>
     </Panel>
 </UserControl>

app/Desktop/Main/Screens/WelcomeScreenModel.cs

@@ -1,25 +1,31 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+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.Server.Database;
 using DHT.Server.Database.Sqlite.Schema;
+using DHT.Utils.Logging;
 
 namespace DHT.Desktop.Main.Screens;
 
 sealed partial class WelcomeScreenModel : ObservableObject {
+	private static readonly Log Log = Log.ForType<WelcomeScreenModel>();
+
 	public string Version => Program.Version;
-	
+
 	[ObservableProperty(Setter = Access.Private)]
 	private bool isOpenOrCreateDatabaseButtonEnabled = true;
-	
+
-	public event EventHandler<IDatabaseFile>? DatabaseSelected; 
+	public event EventHandler<IDatabaseFile>? DatabaseSelected;
-	
+
 	private readonly Window window;
 
 	private string? dbFilePath;
@@ -45,20 +51,22 @@ 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) {
+		if (db == null) {
-			DatabaseSelected?.Invoke(this, db);
+			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);
+		}
+
+		DatabaseSelected?.Invoke(this, db);
 	}
 
-	private sealed class SchemaUpgradeCallbacks : ISchemaUpgradeCallbacks {
+	private sealed class SchemaUpgradeCallbacks(Window window) : ISchemaUpgradeCallbacks {
-		private readonly Window window;
-		
-		public SchemaUpgradeCallbacks(Window window) {
-			this.window = window;
-		}
-
 		public async Task<bool> CanUpgrade() {
 			return DialogResult.YesNo.Yes == await DatabaseGui.ShowCanUpgradeDatabaseDialog(window);
 		}
@@ -71,20 +79,12 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 				await doUpgrade(reporter);
 				await Task.Delay(TimeSpan.FromMilliseconds(600));
 			}
-			
+
 			await new ProgressDialog { DataContext = new ProgressDialogModel("Upgrading Database", StartUpgrade, progressItems: 3) }.ShowProgressDialog(window);
 		}
 
-		private sealed class ProgressReporter : ISchemaUpgradeCallbacks.IProgressReporter {
+		private sealed class ProgressReporter(int versionSteps, IReadOnlyList<IProgressCallback> callbacks) : ISchemaUpgradeCallbacks.IProgressReporter {
-			private readonly IReadOnlyList<IProgressCallback> callbacks;
-			
-			private readonly int versionSteps;
 			private int versionProgress = 0;
-			
-			public ProgressReporter(int versionSteps, IReadOnlyList<IProgressCallback> callbacks) {
-				this.callbacks = callbacks;
-				this.versionSteps = versionSteps;
-			}
 
 			public async Task NextVersion() {
 				await callbacks[0].Update("Upgrading schema version...", versionProgress++, versionSteps);
@@ -109,6 +109,53 @@ sealed partial class WelcomeScreenModel : ObservableObject {
 		}
 	}
 
+	public async Task CheckUpdates() {
+		Version? latestVersion = await ProgressDialog.ShowIndeterminate<Version?>(window, "Check Updates", "Checking for updates...", async _ => {
+			var client = new HttpClient(new SocketsHttpHandler {
+				AutomaticDecompression = DecompressionMethods.None,
+				AllowAutoRedirect = 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");
+			} catch (TaskCanceledException e) when (e.InnerException is TimeoutException) {
+				await Dialog.ShowOk(window, "Check Updates", "Request timed out.");
+				return null;
+			} catch (Exception e) {
+				Log.Error(e);
+				await Dialog.ShowOk(window, "Check Updates", "Error checking for updates: " + e.Message);
+				return null;
+			}
+
+			if (!System.Version.TryParse(response, out var latestVersion)) {
+				await Dialog.ShowOk(window, "Check Updates", "Server returned an invalid response.");
+				return null;
+			}
+
+			return latestVersion;
+		});
+
+		if (latestVersion == null) {
+			return;
+		}
+		
+		if (Program.AssemblyVersion >= latestVersion) {
+			await Dialog.ShowOk(window, "Check Updates", "You are using the latest version.");
+			return;
+		}
+		
+		if (await Dialog.ShowYesNo(window, "Check Updates", "A newer version is available: v" + Program.VersionToString(latestVersion) + "\nVisit the official website and close the app?") == DialogResult.YesNo.Yes) {
+			SystemUtils.OpenUrl(Program.Website);
+			Exit();
+		}
+	}
+
 	public async Task ShowAboutDialog() {
 		await new AboutWindow { DataContext = new AboutWindowModel() }.ShowDialog(window);
 	}

app/Desktop/Program.cs

@@ -9,17 +9,18 @@ namespace DHT.Desktop;
 
 static class Program {
 	public static string Version { get; }
+	public static Version AssemblyVersion { get; }
 	public static CultureInfo Culture { get; }
 	public static ResourceLoader Resources { get; }
 	public static Arguments Arguments { get; }
 
+	public const string Website = "https://dht.chylex.com";
+	
 	static Program() {
 		var assembly = Assembly.GetExecutingAssembly();
 
-		Version = assembly.GetName().Version?.ToString() ?? "";
+		AssemblyVersion = assembly.GetName().Version ?? new Version(0, 0, 0, 0);
-		while (Version.EndsWith(".0")) {
+		Version = VersionToString(AssemblyVersion);
-			Version = Version[..^2];
-		}
 
 		Culture = CultureInfo.CurrentCulture;
 		CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
@@ -30,6 +31,16 @@ static class Program {
 		Resources = new ResourceLoader(assembly);
 		Arguments = new Arguments(Environment.GetCommandLineArgs());
 	}
+	
+	public static string VersionToString(Version version) {
+		string versionStr = version.ToString();
+		
+		while (versionStr.EndsWith(".0")) {
+			versionStr = versionStr[..^2];
+		}
+		
+		return versionStr;
+	}
 
 	public static void Main(string[] args) {
 		if (Arguments.Console && OperatingSystem.IsWindows()) {

app/Resources/Tracker/bootstrap.js

@@ -133,6 +133,7 @@
 	STATE.onTrackingStateChanged(enabled => {
 		if (enabled) {
 			GUI.setStatus("Starting");
+			GUI.createTrackingStyles();
 			hasJustStarted = true;
 			
 			if (!starter()) {
@@ -142,6 +143,7 @@
 		}
 		else {
 			isSending = false;
+			GUI.deleteTrackingStyles();
 		}
 	});
 	

app/Resources/Tracker/scripts/discord.js

@@ -42,14 +42,14 @@ class DISCORD {
 	 * @type {Object}
 	 * @property {function(String): ?DiscordGuild} getGuild
 	 */
-	static #guildStore = WEBPACK.findModule(WEBPACK.filterByProps("getGuild", "getGuilds", "getGuildIds"));
+	static #guildStore = WEBPACK.findModule("guildStore", WEBPACK.filterByProps("getGuild", "getGuilds", "getGuildIds"));
 	
 	/**
 	 * @type {Object}
 	 * @property {function(String): Boolean} isOptInEnabled
 	 * @property {function(String): Set<String>} getOptedInChannels
 	 */
-	static #guildSettings = WEBPACK.findModule(WEBPACK.filterByProps("isOptInEnabled", "getOptedInChannels"));
+	static #guildSettings = WEBPACK.findModule("guildSettings", WEBPACK.filterByProps("isOptInEnabled", "getOptedInChannels"));
 	
 	/**
 	 * @type {Object}
@@ -57,7 +57,7 @@ class DISCORD {
 	 * @property {function(String): Array<DiscordChannel>} getMutableGuildChannelsForGuild
 	 * @property {function(): Array<DiscordChannel>} getSortedPrivateChannels
 	 */
-	static #channelStore = WEBPACK.findModule(WEBPACK.filterByProps("getChannel", "getMutableGuildChannelsForGuild", "getSortedPrivateChannels"));
+	static #channelStore = WEBPACK.findModule("channelStore", WEBPACK.filterByProps("getChannel", "getMutableGuildChannelsForGuild", "getSortedPrivateChannels"));
 	
 	/**
 	 * @type {function(BigInt, Object): Boolean}
@@ -85,9 +85,9 @@ class DISCORD {
 	static #selectPrivateChannel = WEBPACK.findFunction("selectPrivateChannel", [ "selectChannel" ]);
 	
 	/**
-	 * @type {function(String, String, String=null): void}
+	 * @type {function(String, Object, String=null): void}
 	 */
-	static #transitionToGuild = WEBPACK.findFunction("transitionToGuild", [ "transitionTo" ]);
+	static #transitionToGuildSync = WEBPACK.findFunction("transitionToGuildSync");
 	
 	static isCompatible() {
 		return !!this.#guildStore
@@ -98,7 +98,7 @@ class DISCORD {
 			&& !!this.#jumpToMessage
 			&& !!this.#getCurrentlySelectedChannelId
 			&& !!this.#selectPrivateChannel
-			&& !!this.#transitionToGuild;
+			&& !!this.#transitionToGuildSync;
 	}
 	
 	static getMessageOuterElement() {
@@ -117,24 +117,25 @@ class DISCORD {
 		}
 	}
 	
+	static getMessagesFromSelectedChannel() {
+		const channelId = this.#getCurrentlySelectedChannelId();
+		return channelId ? this.#getMessages(channelId) : null;
+	}
+	
 	/**
 	 * Calls the provided function with a list of messages whenever the currently loaded messages change.
+	 * @param callback {function(server: ?DiscordGuild, channel: DiscordChannel, messages: Array<DiscordMessage>, hasMoreBefore: boolean)}
 	 */
 	static setupMessageCallback(callback) {
 		const previousMessages = new Set();
 		
 		const onMessageElementsChanged = force => {
-			const channelId = this.#getCurrentlySelectedChannelId();
+			const messages = this.getMessagesFromSelectedChannel();
-			if (!channelId) {
-				return false;
-			}
-			
-			const messages = this.#getMessages(channelId);
 			if (!messages || !messages.ready || messages.loadingMore) {
 				return false;
 			}
 			
-			const channel = this.#channelStore.getChannel(channelId);
+			const channel = this.#channelStore.getChannel(messages.channelId);
 			if (!channel) {
 				return false;
 			}
@@ -244,14 +245,13 @@ class DISCORD {
 				.filter(channel => this.CHANNEL_TYPE.isNavigableGuildChannel(channel.type) && isChannelOptedIn(channel) && this.#hasPermission(this.PERMISSION.VIEW_CHANNEL, channel))
 				.sort((a, b) => a.position - b.position);
 			
-			debugger;
 			const currentIndex = guildChannels.findIndex(channel => channel.id === currentChannel.id);
 			
 			if (currentIndex === -1 || currentIndex === guildChannels.length - 1) {
 				return false;
 			}
 			
-			this.#transitionToGuild(guildId, guildChannels[currentIndex + 1].id);
+			this.#transitionToGuildSync(guildId, {}, guildChannels[currentIndex + 1].id);
 			return true;
 		}
 	}

app/Resources/Tracker/scripts/dom.js

@@ -1,6 +1,8 @@
 class DOM {
 	/**
 	 * Returns a child element by its ID. Parent defaults to the entire document.
+	 * @param {string} id
+	 * @param {HTMLElement?} [parent]
 	 * @returns {HTMLElement}
 	 */
 	static id(id, parent) {
@@ -9,6 +11,9 @@ class DOM {
 	
 	/**
 	 * Returns the first child element containing the specified obfuscated class. Parent defaults to the entire document.
+	 * @param {string} cls
+	 * @param {HTMLElement?} [parent]
+	 * @returns {HTMLElement}
 	 */
 	static queryReactClass(cls, parent) {
 		return (parent || document).querySelector(`[class*="${cls}_"]`);

app/Resources/Tracker/scripts/gui.js

@@ -2,14 +2,17 @@
 const GUI = (function() {
 	let controller = null;
 	let settings = null;
+	let trackingStyles = null;
 	
 	const stateChangedEvent = () => {
 		if (settings) {
 			settings.ui.cbAutoscroll.checked = SETTINGS.autoscroll;
+			settings.ui.cbHidePreviewsWhileAutoscrolling.checked = SETTINGS.hidePreviewsWhileAutoscrolling;
 			settings.ui.optsAfterFirstMsg[SETTINGS.afterFirstMsg].checked = true;
 			settings.ui.optsAfterSavedMsg[SETTINGS.afterSavedMsg].checked = true;
 			
 			const autoscrollDisabled = !SETTINGS.autoscroll;
+			settings.ui.cbHidePreviewsWhileAutoscrolling.disabled = autoscrollDisabled;
 			Object.values(settings.ui.optsAfterFirstMsg).forEach(ele => ele.disabled = autoscrollDisabled);
 			Object.values(settings.ui.optsAfterSavedMsg).forEach(ele => ele.disabled = autoscrollDisabled);
 		}
@@ -54,6 +57,7 @@ const GUI = (function() {
 			
 			controller.ui.btnClose.addEventListener("click", () => {
 				this.hideController();
+				this.deleteTrackingStyles();
 				window.DHT_ON_UNLOAD.forEach(f => f());
 				delete window.DHT_ON_UNLOAD;
 				delete window.DHT_LOADED;
@@ -84,6 +88,7 @@ const GUI = (function() {
 			const radio = (type, id, label) => "<label><input id='dht-cfg-" + type + "-" + id + "' name='dht-" + type + "' type='radio'> " + label + "</label><br>";
 			const html = `
 <label><input id='dht-cfg-autoscroll' type='checkbox'> Autoscroll</label><br>
+<label><input id='dht-cfg-hide-previews-while-autoscrolling' type='checkbox'> Hide previews to improve browser performance</label><br>
 <br>
 <label>After reaching the first message in channel...</label><br>
 ${radio("afm", "nothing", "Continue Tracking")}
@@ -93,8 +98,7 @@ ${radio("afm", "switch", "Switch to Next Channel")}
 <label>After reaching a previously saved message...</label><br>
 ${radio("asm", "nothing", "Continue Tracking")}
 ${radio("asm", "pause", "Pause Tracking")}
-${radio("asm", "switch", "Switch to Next Channel")}
+${radio("asm", "switch", "Switch to Next Channel")}`;
-<p id='dht-cfg-note'>It is recommended to disable link and image previews to avoid putting unnecessary strain on your browser.</p>`;
 			
 			settings = {
 				styles: DOM.createStyle(`/*[CSS-SETTINGS]*/`),
@@ -107,9 +111,10 @@ ${radio("asm", "switch", "Switch to Next Channel")}
 			});
 			
 			settings.ui = {
-				cbAutoscroll: DOM.id("dht-cfg-autoscroll"),
+				/** @type {HTMLInputElement} */ cbAutoscroll: DOM.id("dht-cfg-autoscroll"),
-				optsAfterFirstMsg: {},
+				/** @type {HTMLInputElement} */ cbHidePreviewsWhileAutoscrolling: DOM.id("dht-cfg-hide-previews-while-autoscrolling"),
-				optsAfterSavedMsg: {}
+				/** @type {Object.<number, HTMLInputElement>} */ optsAfterFirstMsg: {},
+				/** @type {Object.<number, HTMLInputElement>} */ optsAfterSavedMsg: {}
 			};
 			
 			settings.ui.optsAfterFirstMsg[CONSTANTS.AUTOSCROLL_ACTION_NOTHING] = DOM.id("dht-cfg-afm-nothing");
@@ -124,6 +129,10 @@ ${radio("asm", "switch", "Switch to Next Channel")}
 				SETTINGS.autoscroll = settings.ui.cbAutoscroll.checked;
 			});
 			
+			settings.ui.cbHidePreviewsWhileAutoscrolling.addEventListener("change", () => {
+				SETTINGS.hidePreviewsWhileAutoscrolling = settings.ui.cbHidePreviewsWhileAutoscrolling.checked;
+			});
+			
 			Object.keys(settings.ui.optsAfterFirstMsg).forEach(key => {
 				settings.ui.optsAfterFirstMsg[key].addEventListener("click", () => {
 					SETTINGS.afterFirstMsg = key;
@@ -152,6 +161,29 @@ ${radio("asm", "switch", "Switch to Next Channel")}
 			if (controller) {
 				controller.ui.textStatus.innerText = state;
 			}
+		},
+		
+		createTrackingStyles() {
+			if (trackingStyles) {
+				return;
+			}
+			
+			let style = "";
+			
+			if (SETTINGS.autoscroll && SETTINGS.hidePreviewsWhileAutoscrolling) {
+				style += `div[id^="message-accessories-"] { display: none; }`;
+			}
+			
+			if (style.length > 0) {
+				trackingStyles = DOM.createStyle(style);
+			}
+		},
+		
+		deleteTrackingStyles() {
+			if (trackingStyles) {
+				DOM.removeElement(trackingStyles);
+				trackingStyles = null;
+			}
 		}
 	};
 })();

app/Resources/Tracker/scripts/settings.js

@@ -35,17 +35,28 @@ const SETTINGS = (function() {
 		obj[name] = value;
 	};
 	
+	const defaults = {
+		"_autoscroll": true,
+		"_hidePreviewsWhileAutoscrolling": true,
+		"_afterFirstMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE,
+		"_afterSavedMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE,
+	};
+	
 	let loaded = DOM.loadFromCookie("DHT_SETTINGS");
+	let hasChanged = false;
 	
 	if (!loaded) {
-		loaded = {
+		loaded = defaults;
-			"_autoscroll": true,
-			"_afterFirstMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE,
-			"_afterSavedMsg": CONSTANTS.AUTOSCROLL_ACTION_PAUSE
-		};
-		
 		IS_FIRST_RUN = true;
 	}
+	else {
+		for (const property in defaults) {
+			if (!(property in loaded)) {
+				loaded[property] = defaults[property];
+				hasChanged = true;
+			}
+		}
+	}
 	
 	const root = {
 		onSettingsChanged(callback) {
@@ -54,10 +65,11 @@ const SETTINGS = (function() {
 	};
 	
 	defineTriggeringProperty(root, "autoscroll", loaded._autoscroll);
+	defineTriggeringProperty(root, "hidePreviewsWhileAutoscrolling", loaded._hidePreviewsWhileAutoscrolling);
 	defineTriggeringProperty(root, "afterFirstMsg", loaded._afterFirstMsg);
 	defineTriggeringProperty(root, "afterSavedMsg", loaded._afterSavedMsg);
 	
-	if (IS_FIRST_RUN) {
+	if (IS_FIRST_RUN || hasChanged) {
 		saveSettings();
 	}
 	

app/Resources/Tracker/scripts/state.js

@@ -286,7 +286,7 @@ const STATE = (function() {
 				}
 				
 				if (msg.reactions.length > 0) {
-					obj.reactions = msg.reactions.map(reaction => {
+					obj.reactions = msg.reactions.filter(reaction => reaction.count > 0).map(reaction => {
 						const emoji = reaction.emoji;
 						
 						const mapped = {

app/Resources/Tracker/scripts/types.js

@@ -73,6 +73,7 @@
 /**
  * @name MessageData
  * @type {Object}
+ * @property {String} channelId
  * @property {Boolean} ready
  * @property {Boolean} loadingMore
  * @property {Boolean} hasMoreAfter

app/Resources/Tracker/scripts/webpack.js

@@ -80,14 +80,19 @@ class WEBPACK {
 		return results;
 	}
 	
-	static findModule(filter) {
+	static findModule(name, filter) {
 		const modules = this.findModules(filter);
-		return modules.length === 1 ? modules[0] : null;
+		if (modules.length === 1) {
+			return modules[0];
+		}
+		
+		console.error("[DHT] Cannot find module " + name + ", results found:", modules.length);
+		return null;
 	}
 	
 	static findFunction(name, additionalRequiredProps) {
 		const searchedProps = additionalRequiredProps ? [name, ...additionalRequiredProps] : [name];
-		const matchingModule = this.findModule(this.filterByPropsWithPredicate(prop => typeof(prop) === "function", ...searchedProps));
+		const matchingModule = this.findModule("containing function " + name, this.filterByPropsWithPredicate(prop => typeof(prop) === "function", ...searchedProps));
 		return matchingModule == null ? null : matchingModule[name].bind(matchingModule);
 	}
 }

app/Resources/Tracker/styles/settings.css

@@ -18,11 +18,13 @@
   height: 262px;
   margin-left: -400px;
   margin-top: -131px;
+  line-height: 120%;
   padding: 8px;
   background-color: #fff;
   z-index: 1000002;
 }
 
-#dht-cfg-note {
+#dht-cfg label {
-  margin-top: 22px;
+  display: inline-block;
+  margin: 1px 0;
 }

app/Server/Data/Settings/SettingsKey.cs

@@ -0,0 +1,60 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace DHT.Server.Data.Settings;
+
+public static class SettingsKey {
+	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");
+	public static String DownloadsMaximumSizeUnit { get; } = new ("downloads_maximum_size_unit");
+
+	public sealed class String(string key) : SettingsKey<string>(key) {
+		internal override bool FromString(string value, out string result) {
+			result = value;
+			return true;
+		}
+
+		internal override string ToString(string value) {
+			return value;
+		}
+	}
+	
+	public sealed class Bool(string key) : SettingsKey<bool>(key) {
+		internal override bool FromString(string value, out bool result) {
+			switch (value) {
+				case "1":
+					result = true;
+					return true;
+
+				case "0":
+					result = false;
+					return true;
+
+				default:
+					result = false;
+					return false;
+			}
+		}
+
+		internal override string ToString(bool value) {
+			return value ? "1" : "0";
+		}
+	}
+	
+	public sealed class UnsignedLong(string key) : SettingsKey<ulong>(key) {
+		internal override bool FromString(string value, out ulong result) {
+			return ulong.TryParse(value, out result);
+		}
+
+		internal override string ToString(ulong value) {
+			return value.ToString();
+		}
+	}
+}
+
+public abstract class SettingsKey<T>(string key) {
+	internal string Key => key;
+
+	internal abstract bool FromString(string value, [NotNullWhen(true)] out T result);
+	internal abstract string ToString(T value);
+}

app/Server/Database/DummyDatabaseFile.cs

@@ -10,6 +10,7 @@ sealed class DummyDatabaseFile : IDatabaseFile {
 
 	public string Path => "";
 	
+	public ISettingsRepository Settings { get; } = new ISettingsRepository.Dummy();
 	public IUserRepository Users { get; } = new IUserRepository.Dummy();
 	public IServerRepository Servers { get; } = new IServerRepository.Dummy();
 	public IChannelRepository Channels { get; } = new IChannelRepository.Dummy();

app/Server/Database/IDatabaseFile.cs

@@ -7,6 +7,7 @@ namespace DHT.Server.Database;
 public interface IDatabaseFile : IAsyncDisposable {
 	string Path { get; }
 
+	ISettingsRepository Settings { get; }
 	IUserRepository Users { get; }
 	IServerRepository Servers { get; }
 	IChannelRepository Channels { get; }

app/Server/Database/Repositories/ISettingsRepository.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Threading.Tasks;
+using DHT.Server.Data.Settings;
+
+namespace DHT.Server.Database.Repositories;
+
+public interface ISettingsRepository {
+	Task Set<T>(SettingsKey<T> key, T value);
+	
+	Task Set(Func<ISetter, Task> setter);
+	
+	Task<T?> Get<T>(SettingsKey<T> key, T? defaultValue);
+	
+	interface ISetter {
+		Task Set<T>(SettingsKey<T> key, T value);
+	}
+	
+	internal sealed class Dummy : ISettingsRepository {
+		public Task Set<T>(SettingsKey<T> key, T value) {
+			return Task.CompletedTask;
+		}
+
+		public Task Set(Func<ISetter, Task> setter) {
+			return Task.CompletedTask;
+		}
+
+		public Task<T?> Get<T>(SettingsKey<T> key, T? defaultValue) {
+			return Task.FromResult(defaultValue);
+		}
+	}
+}

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

@@ -20,7 +20,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 
 	internal sealed class NewDownloadCollector : IAsyncDisposable {
 		private readonly SqliteDownloadRepository repository;
-		private bool hasAdded = false;
+		private bool hasChanged = false;
 
 		private readonly SqliteCommand metadataCmd;
 
@@ -31,7 +31,16 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 				"""
 				INSERT INTO download_metadata (normalized_url, download_url, status, type, size)
 				VALUES (:normalized_url, :download_url, :status, :type, :size)
-				ON CONFLICT DO NOTHING
+				ON CONFLICT (normalized_url)
+				DO UPDATE SET
+					download_url = excluded.download_url,
+					type = IFNULL(excluded.type, type),
+					size = IFNULL(excluded.size, size)
+				WHERE status != :success
+				  AND (download_url != excluded.download_url
+				    OR (excluded.type IS NOT NULL AND type IS NOT excluded.type)
+				    OR (excluded.size IS NOT NULL AND size IS NOT excluded.size)
+				  )
 				"""
 			);
 			metadataCmd.Add(":normalized_url", SqliteType.Text);
@@ -39,6 +48,7 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			metadataCmd.Add(":status", SqliteType.Integer);
 			metadataCmd.Add(":type", SqliteType.Text);
 			metadataCmd.Add(":size", SqliteType.Integer);
+			metadataCmd.AddAndSet(":success", SqliteType.Integer, (int) DownloadStatus.Success);
 		}
 
 		public async Task Add(Data.Download download) {
@@ -47,11 +57,11 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 			metadataCmd.Set(":status", (int) download.Status);
 			metadataCmd.Set(":type", download.Type);
 			metadataCmd.Set(":size", download.Size);
-			hasAdded |= await metadataCmd.ExecuteNonQueryAsync() > 0;
+			hasChanged |= await metadataCmd.ExecuteNonQueryAsync() > 0;
 		}
 
 		public void OnCommitted() {
-			if (hasAdded) {
+			if (hasChanged) {
 				repository.UpdateTotalCount();
 			}
 		}
@@ -90,7 +100,8 @@ sealed class SqliteDownloadRepository(SqliteConnectionPool pool) : BaseSqliteRep
 					"""
 					INSERT INTO download_blobs (normalized_url, blob)
 					VALUES (:normalized_url, ZEROBLOB(:blob_length))
-					ON CONFLICT (normalized_url) DO UPDATE SET blob = excluded.blob
+					ON CONFLICT (normalized_url)
+					DO UPDATE SET blob = excluded.blob
 					RETURNING rowid
 					"""
 				);

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

@@ -14,16 +14,8 @@ using Microsoft.Data.Sqlite;
 
 namespace DHT.Server.Database.Sqlite.Repositories;
 
-sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository {
+sealed class SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRepository downloads) : BaseSqliteRepository(Log), IMessageRepository {
 	private static readonly Log Log = Log.ForType<SqliteMessageRepository>();
-	
-	private readonly SqliteConnectionPool pool;
-	private readonly SqliteDownloadRepository downloads;
-
-	public SqliteMessageRepository(SqliteConnectionPool pool, SqliteDownloadRepository downloads) : base(Log) {
-		this.pool = pool;
-		this.downloads = downloads;
-	}
 
 	public async Task Add(IReadOnlyList<Message> messages) {
 		if (messages.Count == 0) {
@@ -50,25 +42,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				("timestamp", SqliteType.Integer)
 			]);
 
-			await using var deleteEditTimestampCmd = DeleteByMessageId(conn, "edit_timestamps");
+			await using var attachmentCmd = conn.Upsert("attachments", [
-			await using var deleteRepliedToCmd = DeleteByMessageId(conn, "replied_to");
-
-			await using var deleteAttachmentsCmd = DeleteByMessageId(conn, "attachments");
-			await using var deleteEmbedsCmd = DeleteByMessageId(conn, "embeds");
-			await using var deleteReactionsCmd = DeleteByMessageId(conn, "reactions");
-
-			await using var editTimestampCmd = conn.Insert("edit_timestamps", [
-				("message_id", SqliteType.Integer),
-				("edit_timestamp", SqliteType.Integer)
-			]);
-
-			await using var repliedToCmd = conn.Insert("replied_to", [
-				("message_id", SqliteType.Integer),
-				("replied_to_id", SqliteType.Integer)
-			]);
-
-			await using var attachmentCmd = conn.Insert("attachments", [
-				("message_id", SqliteType.Integer),
 				("attachment_id", SqliteType.Integer),
 				("name", SqliteType.Text),
 				("type", SqliteType.Text),
@@ -79,19 +53,41 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				("height", SqliteType.Integer)
 			]);
 
-			await using var embedCmd = conn.Insert("embeds", [
+			await using var deleteMessageEditTimestampCmd = DeleteByMessageId(conn, "message_edit_timestamps");
+			await using var deleteMessageRepliedToCmd = DeleteByMessageId(conn, "message_replied_to");
+
+			await using var deleteMessageAttachmentsCmd = DeleteByMessageId(conn, "message_attachments");
+			await using var deleteMessageEmbedsCmd = DeleteByMessageId(conn, "message_embeds");
+			await using var deleteMessageReactionsCmd = DeleteByMessageId(conn, "message_reactions");
+
+			await using var messageEditTimestampCmd = conn.Insert("message_edit_timestamps", [
+				("message_id", SqliteType.Integer),
+				("edit_timestamp", SqliteType.Integer)
+			]);
+
+			await using var messageRepliedToCmd = conn.Insert("message_replied_to", [
+				("message_id", SqliteType.Integer),
+				("replied_to_id", SqliteType.Integer)
+			]);
+
+			await using var messageAttachmentCmd = conn.Insert("message_attachments", [
+				("message_id", SqliteType.Integer),
+				("attachment_id", SqliteType.Integer)
+			]);
+
+			await using var messageEmbedCmd = conn.Insert("message_embeds", [
 				("message_id", SqliteType.Integer),
 				("json", SqliteType.Text)
 			]);
 
-			await using var reactionCmd = conn.Insert("reactions", [
+			await using var messageReactionCmd = conn.Insert("message_reactions", [
 				("message_id", SqliteType.Integer),
 				("emoji_id", SqliteType.Integer),
 				("emoji_name", SqliteType.Text),
 				("emoji_flags", SqliteType.Integer),
 				("count", SqliteType.Integer)
 			]);
-			
+
 			await using var downloadCollector = new SqliteDownloadRepository.NewDownloadCollector(downloads, conn);
 
 			foreach (var message in messages) {
@@ -104,29 +100,30 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 				messageCmd.Set(":timestamp", message.Timestamp);
 				await messageCmd.ExecuteNonQueryAsync();
 
-				await ExecuteDeleteByMessageId(deleteEditTimestampCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageEditTimestampCmd, messageId);
-				await ExecuteDeleteByMessageId(deleteRepliedToCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageRepliedToCmd, messageId);
 
-				await ExecuteDeleteByMessageId(deleteAttachmentsCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageAttachmentsCmd, messageId);
-				await ExecuteDeleteByMessageId(deleteEmbedsCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageEmbedsCmd, messageId);
-				await ExecuteDeleteByMessageId(deleteReactionsCmd, messageId);
+				await ExecuteDeleteByMessageId(deleteMessageReactionsCmd, messageId);
 
 				if (message.EditTimestamp is {} timestamp) {
-					editTimestampCmd.Set(":message_id", messageId);
+					messageEditTimestampCmd.Set(":message_id", messageId);
-					editTimestampCmd.Set(":edit_timestamp", timestamp);
+					messageEditTimestampCmd.Set(":edit_timestamp", timestamp);
-					await editTimestampCmd.ExecuteNonQueryAsync();
+					await messageEditTimestampCmd.ExecuteNonQueryAsync();
 				}
 
 				if (message.RepliedToId is {} repliedToId) {
-					repliedToCmd.Set(":message_id", messageId);
+					messageRepliedToCmd.Set(":message_id", messageId);
-					repliedToCmd.Set(":replied_to_id", repliedToId);
+					messageRepliedToCmd.Set(":replied_to_id", repliedToId);
-					await repliedToCmd.ExecuteNonQueryAsync();
+					await messageRepliedToCmd.ExecuteNonQueryAsync();
 				}
 
 				if (!message.Attachments.IsEmpty) {
 					foreach (var attachment in message.Attachments) {
-						attachmentCmd.Set(":message_id", messageId);
+						object attachmentId = attachment.Id;
-						attachmentCmd.Set(":attachment_id", attachment.Id);
+
+						attachmentCmd.Set(":attachment_id", attachmentId);
 						attachmentCmd.Set(":name", attachment.Name);
 						attachmentCmd.Set(":type", attachment.Type);
 						attachmentCmd.Set(":normalized_url", attachment.NormalizedUrl);
@@ -135,16 +132,20 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 						attachmentCmd.Set(":width", attachment.Width);
 						attachmentCmd.Set(":height", attachment.Height);
 						await attachmentCmd.ExecuteNonQueryAsync();
-						
+
+						messageAttachmentCmd.Set(":message_id", messageId);
+						messageAttachmentCmd.Set(":attachment_id", attachmentId);
+						await messageAttachmentCmd.ExecuteNonQueryAsync();
+
 						await downloadCollector.Add(DownloadLinkExtractor.FromAttachment(attachment));
 					}
 				}
 
 				if (!message.Embeds.IsEmpty) {
 					foreach (var embed in message.Embeds) {
-						embedCmd.Set(":message_id", messageId);
+						messageEmbedCmd.Set(":message_id", messageId);
-						embedCmd.Set(":json", embed.Json);
+						messageEmbedCmd.Set(":json", embed.Json);
-						await embedCmd.ExecuteNonQueryAsync();
+						await messageEmbedCmd.ExecuteNonQueryAsync();
 
 						if (DownloadLinkExtractor.TryFromEmbedJson(embed.Json) is {} download) {
 							await downloadCollector.Add(download);
@@ -154,12 +155,12 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 
 				if (!message.Reactions.IsEmpty) {
 					foreach (var reaction in message.Reactions) {
-						reactionCmd.Set(":message_id", messageId);
+						messageReactionCmd.Set(":message_id", messageId);
-						reactionCmd.Set(":emoji_id", reaction.EmojiId);
+						messageReactionCmd.Set(":emoji_id", reaction.EmojiId);
-						reactionCmd.Set(":emoji_name", reaction.EmojiName);
+						messageReactionCmd.Set(":emoji_name", reaction.EmojiName);
-						reactionCmd.Set(":emoji_flags", (int) reaction.EmojiFlags);
+						messageReactionCmd.Set(":emoji_flags", (int) reaction.EmojiFlags);
-						reactionCmd.Set(":count", reaction.Count);
+						messageReactionCmd.Set(":count", reaction.Count);
-						await reactionCmd.ExecuteNonQueryAsync();
+						await messageReactionCmd.ExecuteNonQueryAsync();
 
 						if (reaction.EmojiId is {} emojiId) {
 							await downloadCollector.Add(DownloadLinkExtractor.FromEmoji(emojiId, reaction.EmojiFlags));
@@ -178,7 +179,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 	public override Task<long> Count(CancellationToken cancellationToken) {
 		return Count(filter: null, cancellationToken);
 	}
-	
+
 	public async Task<long> Count(MessageFilter? filter, CancellationToken cancellationToken) {
 		await using var conn = await pool.Take();
 		return await conn.ExecuteReaderAsync("SELECT COUNT(*) FROM messages" + filter.GenerateConditions().BuildWhereClause(), static reader => reader?.GetInt64(0) ?? 0L, cancellationToken);
@@ -221,7 +222,8 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 			"""
 			SELECT attachment_id, name, type, normalized_url, download_url, size, width, height
 			FROM attachments
-			WHERE message_id = :message_id
+			JOIN message_attachments USING (attachment_id)
+			WHERE message_attachments.message_id = :message_id
 			""";
 
 		await using var attachmentCmd = new MessageToManyCommand<Attachment>(conn, AttachmentSql, static reader => new Attachment {
@@ -238,7 +240,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 		const string EmbedSql =
 			"""
 			SELECT json
-			FROM embeds
+			FROM message_embeds
 			WHERE message_id = :message_id
 			""";
 
@@ -249,7 +251,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 		const string ReactionSql =
 			"""
 			SELECT emoji_id, emoji_name, emoji_flags, count
-			FROM reactions
+			FROM message_reactions
 			WHERE message_id = :message_id
 			""";
 
@@ -262,10 +264,10 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 
 		await using var messageCmd = conn.Command(
 			$"""
-			 SELECT m.message_id, m.sender_id, m.channel_id, m.text, m.timestamp, et.edit_timestamp, rt.replied_to_id
+			 SELECT m.message_id, m.sender_id, m.channel_id, m.text, m.timestamp, met.edit_timestamp, mrt.replied_to_id
 			 FROM messages m
-			 LEFT JOIN edit_timestamps et ON m.message_id = et.message_id
+			 LEFT JOIN message_edit_timestamps met ON m.message_id = met.message_id
-			 LEFT JOIN replied_to rt ON m.message_id = rt.message_id
+			 LEFT JOIN message_replied_to mrt ON m.message_id = mrt.message_id
 			 {filter.GenerateConditions("m").BuildWhereClause()}
 			 """
 		);
@@ -292,7 +294,7 @@ sealed class SqliteMessageRepository : BaseSqliteRepository, IMessageRepository
 
 	public async IAsyncEnumerable<ulong> GetIds(MessageFilter? filter) {
 		await using var conn = await pool.Take();
-		
+
 		await using var cmd = conn.Command("SELECT message_id FROM messages" + filter.GenerateConditions().BuildWhereClause());
 		await using var reader = await cmd.ExecuteReaderAsync();
 

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

@@ -0,0 +1,58 @@
+using System;
+using System.Threading.Tasks;
+using DHT.Server.Data.Settings;
+using DHT.Server.Database.Repositories;
+using DHT.Server.Database.Sqlite.Utils;
+using Microsoft.Data.Sqlite;
+
+namespace DHT.Server.Database.Sqlite.Repositories;
+
+sealed class SqliteSettingsRepository(SqliteConnectionPool pool) : ISettingsRepository {
+	public Task Set<T>(SettingsKey<T> key, T value) {
+		return Set(setter => setter.Set(key, value));
+	}
+
+	public async Task Set(Func<ISettingsRepository.ISetter, Task> setter) {
+		await using var conn = await pool.Take();
+		await conn.BeginTransactionAsync();
+		
+		await using var cmd = conn.Command(
+			"""
+			INSERT INTO metadata (key, value)
+			VALUES (:key, :value)
+			ON CONFLICT (key)
+			DO UPDATE SET value = excluded.value
+			"""
+		);
+
+		cmd.Add(":key", SqliteType.Text);
+		cmd.Add(":value", SqliteType.Text);
+		
+		await setter(new Setter(cmd));
+
+		await cmd.ExecuteNonQueryAsync();
+		await conn.CommitTransactionAsync();
+	}
+	
+	private sealed class Setter(SqliteCommand cmd) : ISettingsRepository.ISetter {
+		public async Task Set<T>(SettingsKey<T> key, T value) {
+			cmd.Set(":key", key.Key);
+			cmd.Set(":value", key.ToString(value));
+			await cmd.ExecuteNonQueryAsync();
+		}
+	}
+
+	public async Task<T?> Get<T>(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");
+			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;
+	}
+}

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

@@ -8,7 +8,10 @@ sealed class SqliteSchemaUpgradeTo3 : ISchemaUpgrade {
 		await reporter.MainWork("Applying schema changes...", 0, 1);
 
 		await SqliteSchema.CreateMessageEditTimestampTable(conn);
+		await conn.ExecuteAsync("ALTER TABLE message_edit_timestamps RENAME TO edit_timestamps");
+		
 		await SqliteSchema.CreateMessageRepliedToTable(conn);
+		await conn.ExecuteAsync("ALTER TABLE message_replied_to RENAME TO replied_to");
 
 		await conn.ExecuteAsync("""
 		                        INSERT INTO edit_timestamps (message_id, edit_timestamp)

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

@@ -0,0 +1,23 @@
+using System.Threading.Tasks;
+using DHT.Server.Database.Sqlite.Utils;
+
+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 SqliteSchema.CreateMessageAttachmentsTable(conn);
+		
+		await reporter.MainWork("Migrating message attachments...", 1, 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 conn.ExecuteAsync("DROP INDEX attachments_message_ix");
+		await conn.ExecuteAsync("ALTER TABLE attachments DROP COLUMN message_id");
+		
+		await conn.ExecuteAsync("ALTER TABLE embeds RENAME TO message_embeds");
+		await conn.ExecuteAsync("ALTER TABLE edit_timestamps RENAME TO message_edit_timestamps");
+		await conn.ExecuteAsync("ALTER TABLE replied_to RENAME TO message_replied_to");
+		await conn.ExecuteAsync("ALTER TABLE reactions RENAME TO message_reactions");
+	}
+}

app/Server/Database/Sqlite/SqliteDatabaseFile.cs

@@ -39,6 +39,7 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 
 	public string Path { get; }
 	
+	public ISettingsRepository Settings => settings;
 	public IUserRepository Users => users;
 	public IServerRepository Servers => servers;
 	public IChannelRepository Channels => channels;
@@ -47,6 +48,7 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 	
 	private readonly SqliteConnectionPool pool;
 	
+	private readonly SqliteSettingsRepository settings;
 	private readonly SqliteUserRepository users;
 	private readonly SqliteServerRepository servers;
 	private readonly SqliteChannelRepository channels;
@@ -58,6 +60,7 @@ public sealed class SqliteDatabaseFile : IDatabaseFile {
 		this.pool = pool;
 
 		downloads = new SqliteDownloadRepository(pool);
+		settings = new SqliteSettingsRepository(pool);
 		users = new SqliteUserRepository(pool, downloads);
 		servers = new SqliteServerRepository(pool);
 		channels = new SqliteChannelRepository(pool);

app/Server/Database/Sqlite/SqliteSchema.cs

@@ -8,7 +8,7 @@ using DHT.Utils.Logging;
 namespace DHT.Server.Database.Sqlite;
 
 sealed class SqliteSchema {
-	internal const int Version = 8;
+	internal const int Version = 9;
 
 	private static readonly Log Log = Log.ForType<SqliteSchema>();
 
@@ -86,7 +86,6 @@ sealed class SqliteSchema {
 
 		await conn.ExecuteAsync("""
 		                        CREATE TABLE attachments (
-		                        	message_id     INTEGER NOT NULL,
 		                        	attachment_id  INTEGER NOT NULL PRIMARY KEY NOT NULL,
 		                        	name           TEXT NOT NULL,
 		                        	type           TEXT,
@@ -99,14 +98,14 @@ sealed class SqliteSchema {
 		                        """);
 
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE embeds (
+		                        CREATE TABLE message_embeds (
 		                        	message_id INTEGER NOT NULL,
 		                        	json       TEXT NOT NULL
 		                        )
 		                        """);
 
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE reactions (
+		                        CREATE TABLE message_reactions (
 		                        	message_id  INTEGER NOT NULL,
 		                        	emoji_id    INTEGER,
 		                        	emoji_name  TEXT,
@@ -118,17 +117,17 @@ sealed class SqliteSchema {
 		await CreateMessageEditTimestampTable(conn);
 		await CreateMessageRepliedToTable(conn);
 		await CreateDownloadTables(conn);
+		await CreateMessageAttachmentsTable(conn);
 
-		await conn.ExecuteAsync("CREATE INDEX attachments_message_ix ON attachments(message_id)");
+		await conn.ExecuteAsync("CREATE INDEX embeds_message_ix ON message_embeds(message_id)");
-		await conn.ExecuteAsync("CREATE INDEX embeds_message_ix ON embeds(message_id)");
+		await conn.ExecuteAsync("CREATE INDEX reactions_message_ix ON message_reactions(message_id)");
-		await conn.ExecuteAsync("CREATE INDEX reactions_message_ix ON reactions(message_id)");
 
 		await conn.ExecuteAsync("INSERT INTO metadata (key, value) VALUES ('version', " + Version + ")");
 	}
 
 	internal static async Task CreateMessageEditTimestampTable(ISqliteConnection conn) {
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE edit_timestamps (
+		                        CREATE TABLE message_edit_timestamps (
 		                        	message_id     INTEGER PRIMARY KEY NOT NULL,
 		                        	edit_timestamp INTEGER NOT NULL
 		                        )
@@ -137,7 +136,7 @@ sealed class SqliteSchema {
 
 	internal static async Task CreateMessageRepliedToTable(ISqliteConnection conn) {
 		await conn.ExecuteAsync("""
-		                        CREATE TABLE replied_to (
+		                        CREATE TABLE message_replied_to (
 		                        	message_id    INTEGER PRIMARY KEY NOT NULL,
 		                        	replied_to_id INTEGER NOT NULL
 		                        )
@@ -163,6 +162,18 @@ sealed class SqliteSchema {
 		                        )
 		                        """);
 	}
+	
+	internal static async Task CreateMessageAttachmentsTable(ISqliteConnection conn) {
+		await conn.ExecuteAsync("""
+		                        CREATE TABLE message_attachments (
+		                        	message_id    INTEGER NOT NULL,
+		                        	attachment_id INTEGER NOT NULL,
+		                        	PRIMARY KEY (message_id, attachment_id),
+		                            FOREIGN KEY (message_id) REFERENCES messages (message_id) ON UPDATE CASCADE ON DELETE CASCADE,
+		                            FOREIGN KEY (attachment_id) REFERENCES attachments (attachment_id) ON UPDATE CASCADE ON DELETE CASCADE
+		                        )
+		                        """);
+	}
 
 	private async Task UpgradeSchemas(int dbVersion, ISchemaUpgradeCallbacks.IProgressReporter reporter) {
 		var upgrades = new Dictionary<int, ISchemaUpgrade> {
@@ -173,13 +184,14 @@ sealed class SqliteSchema {
 			{ 5, new SqliteSchemaUpgradeTo6() },
 			{ 6, new SqliteSchemaUpgradeTo7() },
 			{ 7, new SqliteSchemaUpgradeTo8() },
+			{ 8, new SqliteSchemaUpgradeTo9() },
 		};
 
 		var perf = Log.Start("from version " + dbVersion);
 
 		for (int fromVersion = dbVersion; fromVersion < Version; fromVersion++) {
 			var toVersion = fromVersion + 1;
-			
+
 			if (upgrades.TryGetValue(fromVersion, out var upgrade)) {
 				await upgrade.Run(conn, reporter);
 			}

app/Server/Download/DownloaderTask.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Reactive.Subjects;
@@ -70,10 +71,15 @@ sealed class DownloaderTask : IAsyncDisposable {
 		var client = new HttpClient(new SocketsHttpHandler {
 			ConnectTimeout = TimeSpan.FromSeconds(30)
 		});
-		
+
 		client.Timeout = Timeout.InfiniteTimeSpan;
 		client.DefaultRequestHeaders.UserAgent.ParseAdd(UserAgent);
 
+		string tempFileName = Path.GetTempFileName();
+		log.Debug("Using temporary file: " + tempFileName);
+
+		await using var tempFileStream = new FileStream(tempFileName, FileMode.Create, FileAccess.ReadWrite, FileShare.Read, 4096, FileOptions.DeleteOnClose);
+
 		while (!cancellationToken.IsCancellationRequested) {
 			var item = await downloadQueue.Reader.ReadAsync(cancellationToken);
 			log.Debug("Downloading " + item.DownloadUrl + "...");
@@ -81,15 +87,7 @@ sealed class DownloaderTask : IAsyncDisposable {
 			try {
 				var response = await client.SendAsync(new HttpRequestMessage(HttpMethod.Get, item.DownloadUrl), HttpCompletionOption.ResponseHeadersRead, cancellationToken);
 				response.EnsureSuccessStatusCode();
-
+				await HandleResponse(response, tempFileStream, item);
-				if (response.Content.Headers.ContentLength is {} contentLength) {
-					await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
-					await db.Downloads.AddDownload(item.ToSuccess(contentLength), stream);
-				}
-				else {
-					await db.Downloads.AddDownload(item.ToFailure(), stream: null);
-					log.Error("Download response has no content length: " + item.DownloadUrl);
-				}
 			} catch (OperationCanceledException e) when (e.CancellationToken == cancellationToken) {
 				// Ignore.
 			} catch (TaskCanceledException e) when (e.InnerException is TimeoutException) {
@@ -111,6 +109,27 @@ sealed class DownloaderTask : IAsyncDisposable {
 		}
 	}
 
+	private async Task HandleResponse(HttpResponseMessage response, FileStream tempFileStream, DownloadItem item) {
+		if (response.Content.Headers.ContentLength is not {} contentLength) {
+			throw new InvalidOperationException("Download response has no content length: " + item.DownloadUrl);
+		}
+
+		try {
+			if (tempFileStream.Length != 0) {
+				throw new InvalidOperationException("Temporary file is not empty: " + tempFileStream.Name);
+			}
+
+			await using (var responseStream = await response.Content.ReadAsStreamAsync(cancellationToken)) {
+				await responseStream.CopyToAsync(tempFileStream, cancellationToken);
+			}
+
+			tempFileStream.Seek(0, SeekOrigin.Begin);
+			await db.Downloads.AddDownload(item.ToSuccess(contentLength), tempFileStream);
+		} finally {
+			tempFileStream.SetLength(0);
+		}
+	}
+
 	public async ValueTask DisposeAsync() {
 		try {
 			await cancellationTokenSource.CancelAsync();

app/Server/Server.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
   
   <ItemGroup>
-    <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.7" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
   </ItemGroup>
   

app/Utils/Tasks/DelayedThrottledTask.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Threading;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using DHT.Utils.Logging;
+
+namespace DHT.Utils.Tasks;
+
+public sealed class DelayedThrottledTask<T> : IDisposable {
+	private readonly Channel<T> taskChannel = Channel.CreateBounded<T>(new BoundedChannelOptions(capacity: 1) {
+		SingleReader = true,
+		SingleWriter = false,
+		AllowSynchronousContinuations = false,
+		FullMode = BoundedChannelFullMode.DropOldest
+	});
+
+	private readonly CancellationTokenSource cancellationTokenSource = new ();
+	private readonly Log log;
+	private readonly TimeSpan delay;
+	private readonly Func<T, Task> inputProcessor;
+
+	public DelayedThrottledTask(Log log, TimeSpan delay, Func<T, Task> inputProcessor) {
+		this.log = log;
+		this.delay = delay;
+		this.inputProcessor = inputProcessor;
+
+		Task.Run(ReaderTask);
+	}
+
+	private async Task ReaderTask() {
+		var cancellationToken = cancellationTokenSource.Token;
+
+		try {
+			while (await taskChannel.Reader.WaitToReadAsync(cancellationToken)) {
+				await Task.Delay(delay, cancellationToken);
+
+				T input = await taskChannel.Reader.ReadAsync(cancellationToken);
+				try {
+					await inputProcessor(input);
+				} catch (OperationCanceledException) {
+					throw;
+				} catch (Exception e) {
+					log.Error("Caught exception in task: " + e);
+				}
+			}
+		} catch (OperationCanceledException) {
+			// Ignore.
+		} finally {
+			cancellationTokenSource.Dispose();
+		}
+	}
+	
+	public void Post(T input) {
+		taskChannel.Writer.TryWrite(input);
+	}
+
+	public void Dispose() {
+		taskChannel.Writer.Complete();
+		cancellationTokenSource.Cancel();
+	}
+}

app/Version.cs

@@ -8,5 +8,5 @@ using DHT.Utils;
 namespace DHT.Utils;
 
 static class Version {
-	public const string Tag = "42.1.0.0";
+	public const string Tag = "44.0.0.0";
 }