feat: clear timeouts that never get logged

Catalogger.Backend/Database/Repositories/TimeoutRepository.cs

@@ -5,7 +5,9 @@ using Remora.Rest.Core;
 
 namespace Catalogger.Backend.Database.Repositories;
 
-public class TimeoutRepository(DatabaseConnection conn) : IDisposable, IAsyncDisposable
+public class TimeoutRepository(DatabaseConnection conn, IClock clock)
+    : IDisposable,
+        IAsyncDisposable
 {
     public async Task<DiscordTimeout?> GetAsync(int id) =>
         await conn.QueryFirstOrDefaultAsync<DiscordTimeout>(
@@ -62,6 +64,12 @@ public class TimeoutRepository(DatabaseConnection conn) : IDisposable, IAsyncDis
             new { GuildId = guildId.Value, UserId = userId.Value }
         );
 
+    public async Task<int> RemoveExpiredTimeoutsAsync() =>
+        await conn.ExecuteAsync(
+            "delete from timeouts where until < @Expiry",
+            new { Expiry = clock.GetCurrentInstant() - Duration.FromMinutes(5) }
+        );
+
     public void Dispose()
     {
         conn.Dispose();