Release v43.1

Closes #264

app/Desktop/Desktop.csproj

@@ -15,14 +15,14 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.6" Condition=" '$(Configuration)' == 'Debug' " />
-    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.6" />
-    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.6" />
+    <PackageReference Include="Avalonia" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.11" />
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.11" Condition=" '$(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" />
   </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="1">Public Domain</TextBlock>
-            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibrarySqlite}">Official Website</Button>
+            <TextBlock Grid.Row="4" Grid.Column="0">MVVM Toolkit</TextBlock>
+            <TextBlock Grid.Row="4" Grid.Column="1">MIT</TextBlock>
+            <Button Grid.Row="4" Grid.Column="2" Command="{Binding ShowLibraryCommunityToolkit}">GitHub</Button>
             
-            <TextBlock Grid.Row="5" Grid.Column="0">Microsoft.Data.Sqlite</TextBlock>
-            <TextBlock Grid.Row="5" Grid.Column="1">Apache-2.0</TextBlock>
-            <Button Grid.Row="5" Grid.Column="2" Command="{Binding ShowLibrarySqliteAdoNet}">NuGet</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="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="1">MIT</TextBlock>
+            <Button Grid.Row="7" Grid.Column="2" Command="{Binding ShowLibraryRxNet}">GitHub</Button>
         </Grid>
 
     </StackPanel>

app/Desktop/Main/AboutWindowModel.cs

@@ -7,14 +7,26 @@ sealed class AboutWindowModel {
 		OpenUrl("https://dht.chylex.com");
 	}
 
+	public void ShowIssueTracker() {
+		OpenUrl("https://github.com/chylex/Discord-History-Tracker/issues");
+	}
+	
 	public void ShowSourceCode() {
 		OpenUrl("https://github.com/chylex/Discord-History-Tracker");
 	}
 
+	public void ShowLibraryNetCore() {
+		OpenUrl("https://github.com/dotnet/core");
+	}
+
 	public void ShowLibraryAvalonia() {
 		OpenUrl("https://www.nuget.org/packages/Avalonia");
 	}
 
+	public void ShowLibraryCommunityToolkit() {
+		OpenUrl("https://github.com/CommunityToolkit/dotnet");
+	}
+
 	public void ShowLibrarySqlite() {
 		OpenUrl("https://www.sqlite.org");
 	}
@@ -23,8 +35,8 @@ sealed class AboutWindowModel {
 		OpenUrl("https://www.nuget.org/packages/Microsoft.Data.Sqlite");
 	}
 
-	public void ShowLibraryNetCore() {
-		OpenUrl("https://github.com/dotnet/core");
+	public void ShowLibraryRxNet() {
+		OpenUrl("https://github.com/dotnet/reactive");
 	}
 
 	private static void OpenUrl(string url) {

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;
@@ -8,11 +9,15 @@ 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 = [
@@ -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">
+        <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)]
@@ -74,13 +75,21 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 		RecomputeDownloadStatistics();
 	}
 	
-	public void Dispose() {
+	public async Task Initialize() {
+		await FilterModel.Initialize();
+		
+		if (await state.Db.Settings.Get(SettingsKey.DownloadsAutoStart, false)) {
+			await StartDownload();
+		}
+	}
+
+	public async ValueTask DisposeAsync() {
 		finishedItemsSubscription?.Dispose();
 		
 		downloadItemCountSubscription.Dispose();
 		downloadStatisticsTask.Dispose();
 
-		FilterModel.Dispose();
+		await FilterModel.DisposeAsync();
 	}
 
 	private void OnDownloadCountChanged(long newDownloadCount) {
@@ -91,6 +100,26 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 		IsToggleDownloadButtonEnabled = false;
 
 		if (IsDownloading) {
+			await StopDownload();
+		}
+		else {
+			await StartDownload();
+		}
+
+		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();
 
@@ -98,19 +127,14 @@ sealed partial class DownloadsPageModel : ObservableObject, IDisposable {
 		finishedItemsSubscription = null;
 			
 		currentDownloadFilter = null;
-		}
-		else {
-			await state.Db.Downloads.MoveDownloadingItemsBackToQueue();
-			
-			var finishedItems = await state.Downloader.Start(currentDownloadFilter = FilterModel.CreateFilter());
-			finishedItemsSubscription = finishedItems.ObserveOn(AvaloniaScheduler.Instance).Subscribe(OnItemFinished);
+		OnDownloadStateChanged();
 	}
 
+	private void OnDownloadStateChanged() {
 		RecomputeDownloadStatistics();
 
 		OnPropertyChanged(nameof(ToggleDownloadButtonText));
 		OnPropertyChanged(nameof(IsDownloading));
-		IsToggleDownloadButtonEnabled = true;
 	}
 
 	private void OnItemFinished(DownloadItem item) {

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; }
 
@@ -71,8 +72,12 @@ sealed class MainContentScreenModel : IDisposable {
 		StatusBarModel = new StatusBarModel(state);
 	}
 	
-	public void Dispose() {
-		DownloadsPageModel.Dispose();
+	public async Task Initialize() {
+		await DownloadsPageModel.Initialize();
+	}
+
+	public async ValueTask DisposeAsync() {
+		await DownloadsPageModel.DisposeAsync();
 		ViewerPageModel.Dispose();
 		AdvancedPageModel.Dispose();
 		StatusBarModel.Dispose();

app/Desktop/Main/Screens/WelcomeScreenModel.cs

@@ -7,6 +7,7 @@ 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;
 
@@ -46,10 +47,18 @@ 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) {
-			DatabaseSelected?.Invoke(this, db);
+		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);
+		}
+		
+		DatabaseSelected?.Invoke(this, db);
 	}
 
 	private sealed class SchemaUpgradeCallbacks : ISchemaUpgradeCallbacks {

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/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/SqliteSchemaUpgradeTo9.cs

@@ -9,7 +9,7 @@ sealed class SqliteSchemaUpgradeTo9 : ISchemaUpgrade {
 		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");
+		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");

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/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 = "43.1.0.0";
 }