Add async for saving backtests

src/Managing.Application/Bots/Grains/BacktestTradingBotGrain.cs

@@ -79,6 +79,7 @@ public class BacktestTradingBotGrain : Grain, IBacktestTradingBotGrain
         // Initialize wallet balance with first candle
         tradingBot.WalletBalances.Clear();
         tradingBot.WalletBalances.Add(candles.FirstOrDefault()!.Date, config.BotTradingBalance);
+        var initialBalance = config.BotTradingBalance;
 
         var fixedCandles = new HashSet<Candle>();
         // Process all candles following the exact pattern from GetBacktestingResult
@@ -166,13 +167,13 @@ public class BacktestTradingBotGrain : Grain, IBacktestTradingBotGrain
             Metadata = metadata,
             StartDate = candles.FirstOrDefault()!.OpenTime,
             EndDate = candles.LastOrDefault()!.OpenTime,
-            InitialBalance = tradingBot.WalletBalances.FirstOrDefault().Value,
+            InitialBalance = initialBalance,
             NetPnl = finalPnl - fees,
         };
 
         if (save && user != null)
         {
-            _backtestRepository.InsertBacktestForUser(user, result);
+            await _backtestRepository.InsertBacktestForUserAsync(user, result);
         }
 
         // Send notification if backtest meets criteria