Polish absence analysis demo experience

backend/services/cluster_service.py

@@ -2,17 +2,21 @@ from core.clustering import KMeansAnalyzer
 
 
 class ClusterService:
-    def __init__(self):
-        self.analyzer = KMeansAnalyzer()
-    
+    def _create_analyzer(self):
+        # 聚类接口会被前端并发调用，避免复用同一个可变分析器实例导致结果串线。
+        return KMeansAnalyzer()
+
     def get_cluster_result(self, n_clusters=3):
-        return self.analyzer.get_cluster_results(n_clusters)
-    
+        analyzer = self._create_analyzer()
+        return analyzer.get_cluster_results(n_clusters)
+
     def get_cluster_profile(self, n_clusters=3):
-        return self.analyzer.get_cluster_profile(n_clusters)
-    
+        analyzer = self._create_analyzer()
+        return analyzer.get_cluster_profile(n_clusters)
+
     def get_scatter_data(self, n_clusters=3, x_axis='月均加班时长', y_axis='缺勤时长（小时）'):
-        return self.analyzer.get_scatter_data(n_clusters, x_axis, y_axis)
+        analyzer = self._create_analyzer()
+        return analyzer.get_scatter_data(n_clusters, x_axis, y_axis)
 
 
 cluster_service = ClusterService()