add: Added .cleanupguilddata command which will delete all guildconfigs, xp stats and other data related to any guild the bot is no longer in. This is a highly destructive and irreversible command.

dev: Added cascade deletes to any tables which have guildconfigs FK, as well as to some other missing places

src/NadekoBot/Modules/Administration/DangerousCommands/_common/CleanupId.cs

@@ -0,0 +1,9 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace NadekoBot.Modules.Administration.DangerousCommands;
+
+public sealed class CleanupId
+{
+    [Key]
+    public ulong GuildId { get; set; }
+}

src/NadekoBot/Modules/Administration/DangerousCommands/_common/ICleanupService.cs

@@ -0,0 +1,6 @@
+namespace NadekoBot.Modules.Administration.DangerousCommands;
+
+public interface ICleanupService
+{
+    Task<KeepResult?> DeleteMissingGuildDataAsync();
+}

src/NadekoBot/Modules/Administration/DangerousCommands/_common/KeepReport.cs

@@ -0,0 +1,7 @@
+namespace NadekoBot.Modules.Administration.DangerousCommands;
+
+public sealed class KeepReport
+{
+    public required int ShardId { get; init; }
+    public required ulong[] GuildIds { get; init; }
+}

src/NadekoBot/Modules/Administration/DangerousCommands/_common/KeepResult.cs

@@ -0,0 +1,6 @@
+namespace NadekoBot.Modules.Administration.DangerousCommands;
+
+public sealed class KeepResult
+{
+    public required int GuildCount { get; init; }
+}