well, it's generated column

modules/RichSiteSummary/Data/Post.cs

@@ -5,6 +5,7 @@
 
 using System;
 using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
 using System.Text;
 using Kruzya.TelegramBot.RichSiteSummary.UrchinTrackingModule;
 using Telegram.Bot.Types.Enums;
@@ -84,10 +85,10 @@ public class Post : RepresentableEntity
     public DateTime ReceivedAt { get; set; }
 
     /// <summary>
-    /// 
+    /// SHA256
     /// </summary>
-    [Required]
     [MaxLength(64)]
+    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
     public string UrlHash { get; set; }
 
     public Post()

modules/RichSiteSummary/Service/RssFetch.cs

@@ -147,7 +147,7 @@ public class RssFetch : IHostedService, IDisposable
             feedPost.Title = post.Title;
             feedPost.Url = post.Link;
             feedPost.PostedAt = post.PublishingDate.GetValueOrDefault(DateTime.Now);
-            feedPost.UrlHash = _hash.GenerateHash(feedPost.Url);
+            // feedPost.UrlHash = _hash.GenerateHash(feedPost.Url);
 
             postsImages.Add(feedPost, await FetchImageUrl(post));
             newPosts.Add(feedPost);