Can attach labels and comment to transaction in the wallet

BTCPayServer/Data/WalletTransactionData.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+
+namespace BTCPayServer.Data
+{
+    public class WalletTransactionData
+    {
+        public string WalletDataId { get; set; }
+        public WalletData WalletData { get; set; }
+        public string TransactionId { get; set; }
+        public string Labels { get; set; }
+        public byte[] Blob { get; set; }
+
+        public WalletTransactionInfo GetBlobInfo()
+        {
+            if (Blob == null || Blob.Length == 0)
+            {
+                return new WalletTransactionInfo();
+            }
+            var blobInfo = JsonConvert.DeserializeObject<WalletTransactionInfo>(ZipUtils.Unzip(Blob));
+            if (!string.IsNullOrEmpty(Labels))
+            {
+                blobInfo.Labels.AddRange(Labels.Split(',', StringSplitOptions.RemoveEmptyEntries));
+            }
+            return blobInfo;
+        }
+        public void SetBlobInfo(WalletTransactionInfo blobInfo)
+        {
+            if (blobInfo == null)
+            {
+                Labels = string.Empty;
+                Blob = Array.Empty<byte>();
+                return;
+            }
+            Labels = String.Join(',', blobInfo.Labels);
+            Blob = ZipUtils.Zip(JsonConvert.SerializeObject(blobInfo));
+        }
+    }
+
+    public class WalletTransactionInfo
+    {
+        public string Comment { get; set; } = string.Empty;
+        [JsonIgnore]
+        public HashSet<string> Labels { get; set; } = new HashSet<string>();
+    }
+}