diff --git a/frontend/mining-app/lib/core/telemetry/session/session_manager.dart b/frontend/mining-app/lib/core/telemetry/session/session_manager.dart
index a83ad1d9..03e69115 100644
--- a/frontend/mining-app/lib/core/telemetry/session/session_manager.dart
+++ b/frontend/mining-app/lib/core/telemetry/session/session_manager.dart
@@ -70,6 +70,8 @@ class SessionManager with WidgetsBindingObserver {
 
     _state = SessionState.foreground;
     _startNewSession();
+    // 上传上次被强杀遗留的事件 + 本次 session_start（含设备信息）
+    _telemetryService?.flushOnBackground();
   }
 
   void _handleBackground() {
@@ -77,6 +79,8 @@ class SessionManager with WidgetsBindingObserver {
 
     _state = SessionState.background;
     _endCurrentSession();
+    // session_end 写入队列后立即上传，不等待阈值
+    _telemetryService?.flushOnBackground();
   }
 
   void _startNewSession() {
diff --git a/frontend/mining-app/lib/core/telemetry/telemetry_service.dart b/frontend/mining-app/lib/core/telemetry/telemetry_service.dart
index 96e739f3..a9f61f55 100644
--- a/frontend/mining-app/lib/core/telemetry/telemetry_service.dart
+++ b/frontend/mining-app/lib/core/telemetry/telemetry_service.dart
@@ -290,6 +290,11 @@ class TelemetryService {
     debugPrint('[Telemetry] User ID cleared');
   }
 
+  Future<void> flushOnBackground() async {
+    await _uploader.uploadBatch(batchSize: 50);
+    debugPrint('[Telemetry] Flushed on background');
+  }
+
   Future<void> pauseForLogout() async {
     _uploader.stopPeriodicUpload();
     await _storage.clearEventQueue();