Initial

LightlessAPI/LightlessSyncAPI/Data/Comparer/UserDataComparer.cs

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+namespace LightlessSync.API.Data.Comparer;
+
+public class UserDataComparer : IEqualityComparer<UserData>
+{
+    private static UserDataComparer _instance = new();
+
+    private UserDataComparer()
+    { }
+
+    public static UserDataComparer Instance => _instance;
+
+    public bool Equals(UserData? x, UserData? y)
+    {
+        if (x == null || y == null) return false;
+        return x.UID.Equals(y.UID, StringComparison.Ordinal);
+    }
+
+    public int GetHashCode(UserData obj)
+    {
+        return obj.UID.GetHashCode();
+    }
+}