Fix restart with no accountName

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

@@ -165,8 +165,40 @@ public class LiveTradingBotGrain : Grain, ILiveTradingBotGrain, IRemindable
 
         try
         {
+            // Handle fallback for empty AccountName before creating the trading bot instance
+            var config = _state.State.Config;
+            if (string.IsNullOrEmpty(config.AccountName))
+            {
+                // Fallback: Get the first account for the user
+                if (_state.State.User == null)
+                {
+                    throw new InvalidOperationException($"Bot '{config.Name}' (ID: {_state.State.Identifier}) has no user information. Cannot determine fallback account.");
+                }
+
+                var firstAccount = await ServiceScopeHelpers.WithScopedService<IAccountService, Account>(
+                    _scopeFactory,
+                    async accountService =>
+                    {
+                        var userAccounts = await accountService.GetAccountsByUserAsync(_state.State.User, true, true);
+                        var account = userAccounts.FirstOrDefault();
+                        if (account == null)
+                        {
+                            throw new InvalidOperationException($"User '{_state.State.User.Name}' has no accounts configured.");
+                        }
+                        return account;
+                    });
+
+                // Update the configuration with the fallback account name
+                config.AccountName = firstAccount.Name;
+                _state.State.Config = config;
+                await _state.WriteStateAsync();
+
+                _logger.LogInformation("Bot '{BotName}' (ID: {BotId}) using fallback account '{AccountName}' for user '{UserName}'", 
+                    config.Name, _state.State.Identifier, firstAccount.Name, _state.State.User.Name);
+            }
+
             // Create and initialize trading bot instance
-            _tradingBot = CreateTradingBotInstance(_state.State.Config);
+            _tradingBot = CreateTradingBotInstance(config);
             await _tradingBot.Start(previousStatus);
 
             // Set startup time only once (first successful start)