Add metadata to backtest

src/Managing.Domain/Backtests/Backtest.cs

@@ -1,4 +1,5 @@
-using System.ComponentModel.DataAnnotations;
+#nullable enable
+using System.ComponentModel.DataAnnotations;
 using Exilion.TradingAtomics;
 using Managing.Domain.Bots;
 using Managing.Domain.Candles;
@@ -58,6 +59,7 @@ public class Backtest
     [Required] public Dictionary<IndicatorType, IndicatorsResultBase> IndicatorsValues { get; set; }
     [Required] public double Score { get; set; }
     public string RequestId { get; set; }
+    public object? Metadata { get; set; }
 
     /// <summary>
     /// Creates a new TradingBotConfig based on this backtest's configuration for starting a live bot.