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sync_state_machine/domain/contract/sync_strategy.py

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+from ...sync_system.strategy import DefaultSyncStrategy
+from ...sync_system.config import StrategyConfig, OrphanAction, UpdateDirection
+from schemas.contract.contract import ContractResponse
+
+
+class ContractSyncStrategy(DefaultSyncStrategy[ContractResponse]):
+    """
+    Contract 同步策略
+    
+    业务规则：
+    1. 使用 (project_id, code) 作为业务唯一键
+    2. 依赖于 project 和 company
+    3. 支持自动绑定
+    4. 默认配置为日常推送模式（本地创建推送到远程，不拉取远程孤儿）
+    
+    schema 已在类定义中设置，禁止在初始化时传入其他 schema。
+    """
+    
+    # 类变量：schema 固定为 ContractResponse
+    schema = ContractResponse
+    
+    # 类变量：默认配置
+    default_config = StrategyConfig(
+        auto_bind=True,
+        auto_bind_fields=["project_id","company_id", "code"],
+        depend_fields={"project_id": "project", "company_id": "supplier"},
+        local_orphan_action=OrphanAction.CREATE_REMOTE,
+        remote_orphan_action=OrphanAction.NONE,
+        update_direction=UpdateDirection.PUSH,
+    )