diff --git a/realm_cli/BsonTools.cs b/realm_cli/BsonTools.cs
new file mode 100644
index 0000000..5192af8
--- /dev/null
+++ b/realm_cli/BsonTools.cs
@@ -0,0 +1,45 @@
+using System.IO;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Bson;
+
+namespace realm_cli
+{
+    public class BsonTools
+    {
+        public static byte[] Encode(object arg)
+        {
+            using (var ms = new MemoryStream())
+            {
+                using (var writer = new BsonWriter(ms))
+                {
+                    var serializer = new JsonSerializer();
+                    serializer.Serialize(writer, arg);
+                }
+
+                return ms.ToArray();
+            }
+        }
+
+        public static T Decode<T>(byte[] arg)
+        {
+            using (var ms = new MemoryStream(arg))
+            {
+                using (var reader = new BsonReader(ms))
+                {
+                    var s = new JsonSerializer();
+                    return s.Deserialize<T>(reader);
+                }
+            }
+        }
+
+        public static T2 Copy<T1, T2>(T1 src)
+        {
+            return Decode<T2>(Encode(src));
+        }
+
+        public static T Clone<T>(T src)
+        {
+            return Copy<T, T>(src);
+        }
+    }
+}
\ No newline at end of file
diff --git a/realm_cli/LiveData.cs b/realm_cli/LiveData.cs
index d1701cd..528511f 100644
--- a/realm_cli/LiveData.cs
+++ b/realm_cli/LiveData.cs
@@ -5,7 +5,7 @@ namespace realm_cli;
 
 public class LiveData : RealmObject
 {
-    [PrimaryKey] public ObjectId ObjId { get; set; } = ObjectId.GenerateNewId();
+    [PrimaryKey] public string Id { get; set; } = ObjectId.GenerateNewId().ToString();
 
     private int ecu_id;
 
@@ -33,6 +33,7 @@ public class LiveData : RealmObject
     
 
     [MapTo("item_id")]
+    [Indexed]
     public int ItemId { get; set; }
 
     private string display_name;
@@ -61,43 +62,12 @@ public class LiveData : RealmObject
 
     public float? Val { get; set; }
 
-    private string _display_value = "";
-
-    public string DisplayValue
-    {
-        get => this._display_value;
-        set
-        {
-            this._display_value = value;
-            this.OnPropertyChanged(nameof(DisplayValue));
-        }
-    }
+    public string DisplayValue { get; set; }
 
     public string ValueLabel { get; set; }
 
-    private DateTime? _uts;
-
-    public DateTime? Uts
-    {
-        get => this._uts;
-        set
-        {
-            this._uts = value;
-            OnPropertyChanged(nameof(Uts));
-        }
-    }
-
-    private double min_;
-
-    public double Min
-    {
-        get => this.min_;
-        set
-        {
-            this.min_ = value;
-            OnPropertyChanged(nameof(Min));
-        }
-    }
+    public double Min { get; set; }
+    
 
     private double max_;
 
@@ -221,6 +191,6 @@ public class LiveData : RealmObject
 
     public override string ToString()
     {
-        return $"ecu: {EcuId} item: {ItemId} value: {Val} name: {this.DisplayName} display value: {this.DisplayValue}";
+        return $"id: {Id} ecu: {EcuId} item: {ItemId} value: {Val} valuelabel: {this.ValueLabel} display value: {this.DisplayValue}";
     }
 }
\ No newline at end of file
diff --git a/realm_cli/Program.cs b/realm_cli/Program.cs
index 0a987a7..5fc4388 100644
--- a/realm_cli/Program.cs
+++ b/realm_cli/Program.cs
@@ -1,14 +1,16 @@
 // See https://aka.ms/new-console-template for more information
 
 using System.ComponentModel;
+using MongoDB.Bson;
 using realm_cli;
 using Realms;
 
 
 Realm GetDB()
 {
-    var cfg = new RealmConfiguration("c:/prjs/realm_test.db");
-    cfg.SchemaVersion = 2;
+    var cfg = new RealmConfiguration("d:/realm_test.db");
+    cfg.SchemaVersion = 4;
+    Realm.Compact(cfg);
     return Realm.GetInstance(cfg);
 }
 
@@ -29,31 +31,89 @@ void PropChanged(object arg, PropertyChangedEventArgs e)
 async Task InsertLiveData()
 {
     var b = DateTime.Now;
-    for (var i = 0; i != 10; ++i)
-    {
-        var item = new LiveData() {ItemId = i, EcuId = 0, Val = new Random().NextSingle()*i};
+    //for (var i = 0; i != 100; ++i)
+    //{
+    //    var item = new LiveData() {ItemId = i, EcuId = 0, Val = new Random().NextSingle()*i};
         //item.PropertyChanged += PropChanged;
-        item.ItemId = i;
-        item.ValueLabel = item.Val.ToString();
-        var db = GetDB();
-        await db.WriteAsync((realm =>
+    //    item.ItemId = i;
+    //    item.ValueLabel = item.Val.ToString();
+        using (var db = GetDB())
         {
-            realm.Add(item);
-        }));
+            await db.WriteAsync((realm =>
+            {
+                for (var i = 0; i != 10000; ++i)
+                {
+                    var item = new LiveData() {ItemId = i, EcuId = 0, Val = new Random().NextSingle()*i};
+                    //item.PropertyChanged += PropChanged;
+                    item.ItemId = i;
+                    item.ValueLabel = $"{i}-test";
+                    item.DisplayValue = item.Val.ToString();
+                    realm.Add(item);
+                }
+            }));    
+     //   }
+        
     }
     Console.WriteLine($"insert needs {(DateTime.Now - b).TotalSeconds} secs");
 }
 
-async Task QueryLiveData()
+async Task<LiveData> QueryLiveData()
 {
     var b = DateTime.Now;
-    for (var i = 0; i != 100; ++i)
+    for (var i = 1; i != 2; ++i)
     {
         var db = GetDB();
-        var cs = db.All<LiveData>().Where(i1 => i1.ItemId == i);
-        Console.WriteLine(cs.FirstOrDefault());
+        var cs = db.All<LiveData>().FirstOrDefault(i1 => i1.ItemId == i);
+        Console.WriteLine($"original {cs}");
+        var ccs = BsonTools.Clone(cs);
+        return ccs;
+        //Console.WriteLine(cs.FirstOrDefault());
+    }
+    Console.WriteLine($"{(DateTime.Now - b).TotalSeconds} secs");
+    return null;
+}
+
+await InsertLiveData();
+var copy_obj = await QueryLiveData();
+copy_obj.Id = ObjectId.GenerateNewId().ToString();
+var tempId = copy_obj.Id;
+using (var db = GetDB())
+{
+    db.Write(() =>
+    {
+        db.Add(copy_obj, update:true);
+    });
+    
+    db.Write(() =>
+    {
+        var item = db.All<LiveData>().FirstOrDefault(i => i.Id == tempId);
+        Console.WriteLine($"ready for updated {item}");
+        item.DisplayValue = "update";
+    });
+    
+}
+/*
+using (var db = GetDB())
+{
+    db.Write(() =>
+    {
+        db.RemoveAll<LiveData>();
+    });
+}
+*/
+/*
+using (var db = GetDB())
+{
+    
+    Console.WriteLine("after updated---------------------------");
+    var b = DateTime.Now;
+    var item = db.All<LiveData>().FirstOrDefault(i => i.Id == tempId);
+    for (var i = 0; i != 2000000; ++i)
+    {
+        BsonTools.Clone(item);
+        
     }
+    Console.WriteLine($"clone needs {(DateTime.Now - b).TotalSeconds}");
 }
+*/
 
-//await InsertLiveData();
-await QueryLiveData();
diff --git a/realm_cli/realm_cli.csproj b/realm_cli/realm_cli.csproj
index a9db1cf..bf5c469 100644
--- a/realm_cli/realm_cli.csproj
+++ b/realm_cli/realm_cli.csproj
@@ -5,9 +5,11 @@
     <TargetFramework>net6.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <PublishSingleFile>true</PublishSingleFile>
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json.Bson" Version="1.0.2" />
     <PackageReference Include="Realm" Version="10.18.0" />
   </ItemGroup>