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

src/NadekoBot/Db/Models/slowmode/SlowmodeIgnoredUser.cs

@@ -0,0 +1,20 @@
+#nullable disable
+namespace Nadeko.Bot.Db.Models;
+
+public class SlowmodeIgnoredUser : DbEntity
+{
+    public ulong UserId { get; set; }
+
+    // override object.Equals
+    public override bool Equals(object obj)
+    {
+        if (obj is null || GetType() != obj.GetType())
+            return false;
+
+        return ((SlowmodeIgnoredUser)obj).UserId == UserId;
+    }
+
+    // override object.GetHashCode
+    public override int GetHashCode()
+        => UserId.GetHashCode();
+}