diff --git a/src/LiveRecorder.Application/Services/DashboardService.cs b/src/LiveRecorder.Application/Services/DashboardService.cs
index 26dea25..681d9ba 100644
--- a/src/LiveRecorder.Application/Services/DashboardService.cs
+++ b/src/LiveRecorder.Application/Services/DashboardService.cs
@@ -44,48 +44,34 @@ public sealed class DashboardService
         var todayUtcEnd = new DateTimeOffset(todayBeijingDate.ToDateTime(TimeOnly.MaxValue), ChinaTime.Zone.GetUtcOffset(beijingNow.DateTime));
         var recentErrorSince = now.AddHours(-24);
 
-        // Run independent queries in parallel for efficiency
-        var activeRecordingTask = _recordSessionRepository.CountByStatusAsync(RecordSessionStatus.Running, cancellationToken);
-        var liveRoomCountTask = _liveRoomRepository.CountByAvailabilityAsync(LiveRoomAvailabilityStatus.Live, cancellationToken);
-        var offlineRoomCountTask = _liveRoomRepository.CountByAvailabilityAsync(LiveRoomAvailabilityStatus.Offline, cancellationToken);
-        var totalRoomCountTask = _liveRoomRepository.CountAsync(cancellationToken);
-        var activeSessionCountTask = _recordSessionRepository.CountActiveAsync(cancellationToken);
-        var recentErrorCountTask = _systemLogRepository.CountRecentErrorsAsync(recentErrorSince, cancellationToken);
-        var todayDurationTask = _recordTaskRepository.SumDurationSecondsAsync(todayUtcStart, todayUtcEnd, cancellationToken);
-        var todayAggregateTask = _recordResultRepository.GetTodayAggregateAsync(todayUtcStart, todayUtcEnd, cancellationToken);
-        var recentSessionsTask = _recordSessionRepository.ListRecentAsync(5, cancellationToken);
-        var todaySessionsTask = _recordSessionRepository.ListInDateRangeAsync(todayUtcStart, todayUtcEnd, cancellationToken);
-        var settingsTask = _systemSettingsService.GetAsync(cancellationToken);
-
-        await Task.WhenAll(
-            activeRecordingTask,
-            liveRoomCountTask,
-            offlineRoomCountTask,
-            totalRoomCountTask,
-            activeSessionCountTask,
-            recentErrorCountTask,
-            todayDurationTask,
-            todayAggregateTask,
-            recentSessionsTask,
-            todaySessionsTask,
-            (Task)settingsTask
-        );
-
-        var (todayTotalBytes, todayTotalDanmaku) = todayAggregateTask.Result;
-        var settings = settingsTask.Result;
+        // Run queries sequentially — DbContext is not thread-safe
+        var activeRecordingCount = await _recordSessionRepository.CountByStatusAsync(RecordSessionStatus.Running, cancellationToken);
+        var liveRoomCount = await _liveRoomRepository.CountByAvailabilityAsync(LiveRoomAvailabilityStatus.Live, cancellationToken);
+        var offlineRoomCount = await _liveRoomRepository.CountByAvailabilityAsync(LiveRoomAvailabilityStatus.Offline, cancellationToken);
+        var totalRoomCount = await _liveRoomRepository.CountAsync(cancellationToken);
+        var activeSessionCount = await _recordSessionRepository.CountActiveAsync(cancellationToken);
+        var recentErrorCount = await _systemLogRepository.CountRecentErrorsAsync(recentErrorSince, cancellationToken);
+        var todayRecordingSeconds = await _recordTaskRepository.SumDurationSecondsAsync(todayUtcStart, todayUtcEnd, cancellationToken);
+        var (todayTotalBytes, todayTotalDanmaku) = await _recordResultRepository.GetTodayAggregateAsync(todayUtcStart, todayUtcEnd, cancellationToken);
+        var recentSessions = await _recordSessionRepository.ListRecentAsync(5, cancellationToken);
+        var todaySessions = await _recordSessionRepository.ListInDateRangeAsync(todayUtcStart, todayUtcEnd, cancellationToken);
+        var settings = await _systemSettingsService.GetAsync(cancellationToken);
         var storageCheck = _storageGuardService.CheckCanStartOrResume(settings);
+        var pendingTranscodeCount = await _recordTaskRepository.CountByStatusAsync(RecordTaskStatus.Processing, cancellationToken);
+        var pendingUploadCount = await _recordResultRepository.CountPendingUploadAsync(cancellationToken);
+        var queuedDataBytes = await _recordResultRepository.SumPendingUploadBytesAsync(cancellationToken);
 
         return new DashboardDto
         {
-            ActiveRecordingCount = activeRecordingTask.Result,
-            LiveRoomCount = liveRoomCountTask.Result,
-            OfflineRoomCount = offlineRoomCountTask.Result,
-            TotalRoomCount = totalRoomCountTask.Result,
-            TodayRecordingSeconds = todayDurationTask.Result,
+            ActiveRecordingCount = activeRecordingCount,
+            LiveRoomCount = liveRoomCount,
+            OfflineRoomCount = offlineRoomCount,
+            TotalRoomCount = totalRoomCount,
+            TodayRecordingSeconds = todayRecordingSeconds,
             TodayDataBytes = todayTotalBytes,
             TodayDanmakuCount = todayTotalDanmaku,
-            ActiveSessionCount = activeSessionCountTask.Result,
-            RecentErrorCount = recentErrorCountTask.Result,
+            ActiveSessionCount = activeSessionCount,
+            RecentErrorCount = recentErrorCount,
             StorageStatus = new StorageStatusDto
             {
                 HasEnoughSpace = storageCheck.HasEnoughSpace,
@@ -94,13 +80,13 @@ public sealed class DashboardService
                 Tier = storageCheck.Tier.ToString(),
                 UsagePercent = storageCheck.UsagePercent
             },
-            PendingTranscodeCount = await _recordTaskRepository.CountByStatusAsync(Domain.Enums.RecordTaskStatus.Processing, cancellationToken),
-            PendingUploadCount = await _recordResultRepository.CountPendingUploadAsync(cancellationToken),
-            QueuedDataBytes = await _recordResultRepository.SumPendingUploadBytesAsync(cancellationToken),
-            RecentSessions = recentSessionsTask.Result
+            PendingTranscodeCount = pendingTranscodeCount,
+            PendingUploadCount = pendingUploadCount,
+            QueuedDataBytes = queuedDataBytes,
+            RecentSessions = recentSessions
                 .Select(MapRecentSession)
                 .ToList(),
-            TopRooms = ComputeTopRooms(todaySessionsTask.Result)
+            TopRooms = ComputeTopRooms(todaySessions)
         };
     }