Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/Modules/Searches/_common/AtlExtensions.cs

@@ -0,0 +1,12 @@
+#nullable disable
+using LinqToDB.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
+using Nadeko.Bot.Db.Models;
+
+namespace NadekoBot.Modules.Searches;
+
+public static class AtlExtensions
+{
+    public static Task<AutoTranslateChannel> GetByChannelId(this IQueryable<AutoTranslateChannel> set, ulong channelId)
+        => set.Include(x => x.Users).FirstOrDefaultAsyncEF(x => x.ChannelId == channelId);
+}