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

src/NadekoBot/Db/Extensions/DbExtensions.cs

@@ -0,0 +1,12 @@
+#nullable disable
+using Microsoft.EntityFrameworkCore;
+using Nadeko.Bot.Db.Models;
+
+namespace NadekoBot.Db;
+
+public static class DbExtensions
+{
+    public static T GetById<T>(this DbSet<T> set, int id)
+        where T : DbEntity
+        => set.FirstOrDefault(x => x.Id == id);
+}