Fix Runtime by adding TotalRuntimeInSeconds

src/Managing.Api/Controllers/DataController.cs

@@ -498,7 +498,8 @@ public class DataController : ControllerBase
             PnL = strategy.Pnl,
             NetPnL = strategy.NetPnL,
             ROIPercentage = strategy.Roi,
-            Runtime = strategy.StartupTime,
+            Runtime = strategy.Status == BotStatus.Running ? strategy.LastStartTime : null,
+            TotalRuntimeSeconds = strategy.GetTotalRuntimeSeconds(),
             WinRate = winRate,
             TotalVolumeTraded = totalVolume,
             VolumeLast24H = volumeLast24h,

src/Managing.Api/Models/Responses/UserStrategyDetailsViewModel.cs

@@ -33,9 +33,14 @@ namespace Managing.Api.Models.Responses
         public decimal ROIPercentage { get; set; }
 
         /// <summary>
-        /// Date and time when the strategy was started
+        /// Date and time when the strategy was started (only present when running, for live ticker)
         /// </summary>
-        public DateTime Runtime { get; set; }
+        public DateTime? Runtime { get; set; }
+
+        /// <summary>
+        /// Total accumulated runtime in seconds (including current session if running)
+        /// </summary>
+        public long TotalRuntimeSeconds { get; set; }
 
         /// <summary>
         /// Average percentage of successful trades