优化sync_system代码质量

sync_state_machine/domain/preparation/sync_strategy.py

@@ -20,16 +20,13 @@ class PreparationSyncStrategy(DefaultSyncStrategy[PreparationDetail]):
         update_direction=UpdateDirection.PUSH,
     )
 
-    def _needs_update(self, source_node, target_node, resolved_data=None, data_id_map=None) -> bool:
-        if resolved_data is None:
-            raise ValueError(f"[{self.node_type}] resolved_data is required for differential sync.")
-
-        target_data = target_node.get_data()
+    def should_update_pair(self, source_node, target_node, *, source_data, target_data, data_id_map=None) -> bool:
         if target_data is None:
             return False
 
+        # 这里只按 PostPreparation 可写字段判定是否需要 update，避免 response-only 字段差异触发空更新。
         update_fields = set(PostPreparation.model_fields.keys())
-        source_payload = {key: value for key, value in resolved_data.items() if key in update_fields}
+        source_payload = {key: value for key, value in source_data.items() if key in update_fields}
         target_payload = {key: value for key, value in target_data.items() if key in update_fields}
 
         normalized_source = normalized_data_for_compare(source_payload, data_id_map or {})