后端优化，增加新需求

backend/tests/test_dedupe_total_data_admin.py

@@ -1,6 +1,6 @@
 import io
 import unittest
-from unittest.mock import patch
+from unittest.mock import Mock, patch
 
 from flask import jsonify
 
@@ -72,6 +72,36 @@ class DedupeTotalDataAdminTest(unittest.TestCase):
         self.assertEqual('import-1', response.get_json()['import_id'])
         self.assertEqual({'operatorId': 31}, proxy.call_args.kwargs['data'])
 
+    def test_export_forwards_filters_and_session_operator(self):
+        self._login(31)
+        java_response = Mock(
+            status_code=200,
+            content=b'xlsx-data',
+            headers={
+                'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+                'Content-Disposition': 'attachment; filename="dedupe-total-data.xlsx"',
+            },
+        )
+        java_session = Mock()
+        java_session.get.return_value = java_response
+        with patch('utils.auth.is_session_user_valid', return_value=True), \
+                patch.object(admin_module, '_ensure_dedupe_total_data_access',
+                             return_value=('normal', {'id': 31, 'username': 'member-b'}, None)), \
+                patch.object(admin_module, '_get_backend_java_session', return_value=java_session):
+            response = self.client.get(
+                '/api/admin/dedupe-total-data/export'
+                '?username=member&start_date=2026-07-01&end_date=2026-07-20')
+
+        self.assertEqual(200, response.status_code)
+        self.assertEqual(b'xlsx-data', response.data)
+        self.assertEqual({
+            'operatorId': 31,
+            'username': 'member',
+            'startDate': '2026-07-01',
+            'endDate': '2026-07-20',
+        }, java_session.get.call_args.kwargs['params'])
+        self.assertEqual(60, java_session.get.call_args.kwargs['timeout'])
+
     def test_delete_ignores_client_operator_and_uses_session_user(self):
         self._login(41)
         java_response = {'success': True, 'message': '删除成功', 'data': None}