Fix unsubscribe + reduce bot update db query

src/Managing.Application/Grains/CandleStoreGrain.cs

@@ -67,12 +67,26 @@ public class CandleStoreGrain : Grain, ICandleStoreGrain, IAsyncObserver<Candle>
 
     public override async Task OnDeactivateAsync(DeactivationReason reason, CancellationToken cancellationToken)
     {
-        // Unsubscribe from the stream
+        // Unsubscribe from the stream with proper error handling
         if (_streamSubscription != null)
+        {
+            try
             {
                 await _streamSubscription.UnsubscribeAsync();
+                _logger.LogDebug("Successfully unsubscribed from stream for grain {GrainKey}", this.GetPrimaryKeyString());
+            }
+            catch (Exception ex)
+            {
+                // Log the error but don't throw - this is common during shutdown when
+                // the pub-sub rendezvous grain may already be deactivated
+                _logger.LogWarning(ex, "Failed to unsubscribe from stream during deactivation for grain {GrainKey}. This is normal during shutdown.", 
+                    this.GetPrimaryKeyString());
+            }
+            finally
+            {
                 _streamSubscription = null;
             }
+        }
 
         await base.OnDeactivateAsync(reason, cancellationToken);
     }

src/Managing.Application/Grains/PriceFetcherGrain.cs

@@ -129,7 +129,7 @@ public class PriceFetcherGrain : Grain, IPriceFetcherGrain, IRemindable
 
             // Get the last candle date from database
             var existingCandles = await _candleRepository.GetCandles(exchange, ticker, timeframe,
-                DateTime.UtcNow.AddDays(-30), DateTime.UtcNow.AddDays(1), 20);
+                DateTime.UtcNow.AddDays(-30), DateTime.UtcNow.AddDays(1), 1);
 
             var isFirstCall = !existingCandles.Any();
 

src/Managing.Application/ManageBot/BotService.cs

@@ -296,6 +296,8 @@ namespace Managing.Application.ManageBot
 
                 var existingBot = await _botRepository.GetBotByIdentifierAsync(bot.Identifier);
 
+                
+
                 // Check if bot already exists in database
                 await ServiceScopeHelpers.WithScopedService<IBotRepository>(
                     _scopeFactory,
@@ -311,7 +313,13 @@ namespace Managing.Application.ManageBot
                                 "Created new bot statistics for bot {BotId}: Wins={Wins}, Losses={Losses}, PnL={PnL}, ROI={ROI}%, Volume={Volume}, Fees={Fees}",
                                 bot.Identifier, bot.TradeWins, bot.TradeLosses, bot.Pnl, bot.Roi, bot.Volume, bot.Fees);
                         }
-                        else
+                        else if (existingBot.Status != bot.Status 
+                            || existingBot.Pnl != Math.Round(bot.Pnl, 8) 
+                            || existingBot.Roi != Math.Round(bot.Roi, 8) 
+                            || existingBot.Volume != Math.Round(bot.Volume, 8) 
+                            || existingBot.Fees != Math.Round(bot.Fees, 8) 
+                            || existingBot.LongPositionCount != bot.LongPositionCount 
+                            || existingBot.ShortPositionCount != bot.ShortPositionCount)
                         {
                             _tradingBotLogger.LogInformation("Update bot statistics for bot {BotId}",
                                 bot.Identifier);