[rss] ability to hide feed from list

modules/RichSiteSummary/Data/Feed.cs

@@ -65,6 +65,10 @@ namespace Kruzya.TelegramBot.RichSiteSummary.Data
         [DefaultValue(false)]
         public bool WatchPostDate { get; set; }
 
+        [Required]
+        [DefaultValue(false)]
+        public bool IsPrivate { get; set; }
+
         public Feed()
         {
             FeedId = new Guid();

modules/RichSiteSummary/Handler/FeedList.cs

@@ -115,7 +115,9 @@ namespace Kruzya.TelegramBot.RichSiteSummary.Handler
             var chat = editableMessage != null ? (editableMessage.Chat) : Chat;
             var elementsOnPage = 9;
             var startIndex = page * elementsOnPage;
-            var dbQuery = _dbContext.Feeds.AsQueryable();
+            var dbQuery = _dbContext.Feeds.AsQueryable()
+                .Where(f => !f.IsPrivate);
+
             if (!string.IsNullOrWhiteSpace(query))
             {
                 var searchQuery = query.ToLower();