再次修复回溯bug

biz/checkpoint/checkpoint_biz.py

@@ -371,16 +371,12 @@ class KadianDetector:
             cv2.rectangle(frame, (x1, y1), (x2, y2), color, 2)
             cv2.putText(frame, label, (x1, y1 - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.6, color, 2)
 
-            # 每帧保存到缓存
-            # self.roi_car_registry[tid]['frame_buffer'].append({
-            #     'frame_idx': current_time_sec,
-            #     'frame': frame.copy(),
-            # })
-            self.frame_buffer_ignore_untrunk.append({
-                'frame_idx': self.current_frame_idx,
-                'timestamp': current_time_sec,
-                'frame': frame.copy(),
-            })
+        # 每帧保存到缓存（移到循环外，确保每帧只写入一次）
+        self.frame_buffer_ignore_untrunk.append({
+            'frame_idx': self.current_frame_idx,
+            'timestamp': current_time_sec,
+            'frame': frame.copy(),
+        })
 
         # ==========================================
         # 关联分析: 哪个后备箱属于哪辆车?