规范了update data的构建方式，统一使用build_update_request_data方法来处理更新数据的构建和过滤逻辑。这个方法会根据提供的原始数据、更新数据和对应的schema来生成最终的更新请求数据，同时会自动排除掉未变化的字段和空值字段，从而确保只发送必要的更新信息到后端接口。这种方式不仅简化了代码逻辑，还提高了代码的可维护性和一致性。

docs/datasource_guide.md

@@ -131,8 +131,8 @@ API 数据源中，校验分为三层：
    - 例如 `ContractCreate.model_validate(...)`、`ContractUpdate.model_validate(...)`
    - load 响应也会在解析后转为领域 schema
 2. 通用更新过滤与差异识别
-   - `_filter_update_data`：仅在 schema 相关字段有变化时提交更新
+   - `build_update_request_data`：update 入口，仅在 schema 相关字段有变化时提交更新
-   - `_get_schema_diff`：用于差异字段识别与调试输出
+   - `get_update_schema_diff`：update 入口，用于差异字段识别与调试输出
 3. 轮询接口输入校验
    - `PushIdsSchema` 校验 push_ids 格式后再请求 `/push/result`
 

sync_state_machine/config/builder.py

@@ -76,10 +76,14 @@ def _apply_strategy_overrides(
             runtime_cfg.config = ConfigPresets.get_preset(str(preset))
 
         skip_sync = override.pop("skip_sync", None)
+        skip_post_check = override.pop("skip_post_check", None)
 
         if skip_sync is not None:
             runtime_cfg.skip_sync = bool(skip_sync)
 
+        if skip_post_check is not None:
+            runtime_cfg.skip_post_check = bool(skip_post_check)
+
         if "config" in override and isinstance(override["config"], dict):
             runtime_cfg.config = runtime_cfg.config.model_validate(
                 _deep_merge(runtime_cfg.config.model_dump(), override.pop("config"))

sync_state_machine/config/strategy_config.py

@@ -59,6 +59,10 @@ class StrategyConfig(BaseModel):
     # schema diff / validate 时忽略的顶层字段。
     compare_ignore_fields: List[str] = Field(default_factory=list)
 
+    # 当 auto-bind 命中“多对一”候选时，允许稳定选择一条进行绑定，剩余候选按 orphan/create 流程继续处理。
+    # 默认关闭，避免在一般场景下引入隐式匹配。
+    allow_many_to_one_auto_bind: bool = False
+
 
 class StrategyRuntimeConfig(BaseModel):
     """Pipeline 层策略运行配置（按 node_type）。"""
@@ -67,6 +71,7 @@ class StrategyRuntimeConfig(BaseModel):
 
     node_type: str
     skip_sync: bool = False
+    skip_post_check: bool = False
     config: StrategyConfig = Field(default_factory=StrategyConfig)
 
 

sync_state_machine/datasource/api/handler.py

@@ -17,7 +17,7 @@ import asyncio
 from abc import abstractmethod
 from copy import deepcopy
 from typing import ClassVar, Dict, List, Any, Optional, TYPE_CHECKING, TypeVar
-from pydantic import BaseModel
+from pydantic import BaseModel, ValidationError
 
 from ...common.type_safety import get_pydantic_model_fields
 from ..handler import BaseNodeHandler
@@ -51,9 +51,6 @@ class BaseApiHandler(BaseNodeHandler[T]):
         # post-check 将只比较这些 schema 覆盖的字段，过滤后端只读的派生字段。
         self.update_schemas: List[type] = []
 
-    def set_collection(self, collection: 'DataCollection') -> None:
-        self._collection = collection
-    
     def get_update_fields(self, *, exclude: frozenset = frozenset({'id'})) -> List[str]:
         """从 update_schemas 中提取所有可写字段名，排除标识键（默认排除 id）。"""
         fields: set = set()
@@ -167,10 +164,6 @@ class BaseApiHandler(BaseNodeHandler[T]):
         payload["steps"] = self._get_request_steps(node) if node is not None else []
         return payload
 
-    def _build_full_update_data(self, new_data: Dict[str, Any], schema: Any) -> Dict[str, Any]:
-        validated = schema.model_validate(new_data)
-        return validated.model_dump(exclude_none=True)
-
     def _mark_approval_snapshot_synced(self, node: 'SyncNode') -> None:
         snapshot = self._get_active_approval_snapshot(node)
         if snapshot:
@@ -255,8 +248,53 @@ class BaseApiHandler(BaseNodeHandler[T]):
             return None
         except Exception as e:
             return str(e)
+
+    def _get_update_schema_payload(
+        self,
+        schema: Any,
+        data: Dict[str, Any],
+        *,
+        require_valid: bool,
+    ) -> Dict[str, Any] | None:
+        """Update 内部实现：提取指定 schema 下的 payload。
+
+        这里明确只服务“update schema”，不负责 response model 一致性校验。
+        这个方法只给 BaseApiHandler 的 update 入口方法复用，不作为 handler 入口。
+
+        处理顺序：
+        1. 先尝试用 update schema 校验，成功则直接使用校验后的 model_dump。
+        2. 如果校验失败且 require_valid=False，则退化为只抽取 schema 定义的字段。
+
+        之所以允许退化，是因为 update 比较时两边快照常常不完整：
+        某些字段在旧快照缺失，但新数据已经有值。此时应该继续比较 schema
+        相关字段，而不是把它误判成“无差异”。
+
+        空字符串和 None 会被统一过滤掉，因为当前 update handler 并不把它们
+        当成“清空字段”的显式语义，而是当作“不参与本次更新”。
+        """
+        try:
+            validated = schema.model_validate(data)
+            payload = validated.model_dump(exclude_unset=True)
+        except ValidationError:
+            if require_valid:
+                return None
+
+            schema_fields = get_pydantic_model_fields(schema)
+            if not schema_fields:
+                return {}
+            payload = {
+                field_name: data.get(field_name)
+                for field_name in schema_fields.keys()
+                if field_name in data
+            }
+
+        return {
+            field_name: value
+            for field_name, value in payload.items()
+            if value not in (None, "")
+        }
     
-    def _get_schema_diff(
+    def get_update_schema_diff(
         self, 
         schema, 
         data: Dict[str, Any], 
@@ -264,8 +302,7 @@ class BaseApiHandler(BaseNodeHandler[T]):
         node_id: Optional[str] = None,
         force_full_schema: bool = False,
     ) -> Dict[str, Any] | None:
-        """
+        """Update 入口：获取指定 update schema 下的差异字段。
-        获取数据在指定 schema 下的差异字段
         
         Args:
             schema: Pydantic schema 类
@@ -276,46 +313,37 @@ class BaseApiHandler(BaseNodeHandler[T]):
         Returns:
             Dict[str, Any] | None: 有差异返回差异字段字典，无差异或字段不全返回 None
         """
-        from pydantic import ValidationError
+        # 当前待发送的数据必须能构成合法 update payload；允许旧快照不完整。
-        
+        new_dict = self._get_update_schema_payload(schema, data, require_valid=True)
-        try:
+        origin_dict = self._get_update_schema_payload(schema, origin_data, require_valid=False)
-            new_model = schema.model_validate(data)
+
-            origin_model = schema.model_validate(origin_data)
+        if new_dict is None or origin_dict is None:
-            
-            new_dict = new_model.model_dump(exclude_unset=True)
-            origin_dict = origin_model.model_dump(exclude_unset=True)
-            
-            if new_dict == origin_dict:
-                if force_full_schema:
-                    return new_dict
-                return None
-            
-            # 返回有差异的字段
-            diff_fields = {k: v for k, v in new_dict.items() if origin_dict.get(k) != v}
-            
-            if diff_fields:
-                # 打印差异详情
-                node_info = f"[{node_id}]" if node_id else ""
-                print(f"  [DIFF] {self.node_type}{node_info} schema={schema.__name__}")
-                for k, v in diff_fields.items():
-                    orig_v = origin_dict.get(k)
-                    print(f"    • {k}: {orig_v!r} → {v!r}")
-            
-            return diff_fields if diff_fields else None
-            
-        except ValidationError:
-            # schema 字段不全，视为无差异
             return None
+
+        if new_dict == origin_dict:
+            if force_full_schema:
+                return new_dict
+            return None
+
+        diff_fields = {k: v for k, v in new_dict.items() if origin_dict.get(k) != v}
+
+        if diff_fields:
+            node_info = f"[{node_id}]" if node_id else ""
+            print(f"  [DIFF] {self.node_type}{node_info} schema={schema.__name__}")
+            for k, v in diff_fields.items():
+                orig_v = origin_dict.get(k)
+                print(f"    • {k}: {orig_v!r} → {v!r}")
+
+        return diff_fields if diff_fields else None
     
-    def _filter_update_data(
+    def build_update_request_data(
         self, 
         new_data: Dict[str, Any], 
         original_data: Dict[str, Any],
         schema: Optional[Any] = None,
         force_full_schema: bool = False,
     ) -> Dict[str, Any]:
-        """
+        """Update 入口：构造最终要发送给更新接口的请求数据。
-        过滤出需要更新的字段
         
         规则：
         1. 提取 schema 定义的所有字段（包括必填）
@@ -342,29 +370,10 @@ class BaseApiHandler(BaseNodeHandler[T]):
                     update_data[key] = new_value
             return update_data
         
-        # 1. 提取 schema 定义的所有字段
+        schema_data = self._get_update_schema_payload(schema, new_data, require_valid=True) or {}
-        schema_fields = set(schema_fields.keys())
+        origin_schema_data = self._get_update_schema_payload(schema, original_data, require_valid=False) or {}
-        schema_data = {}
+
-        has_change = False
+        if force_full_schema or schema_data != origin_schema_data:
-        
-        for key in schema_fields:
-            new_value = new_data.get(key)
-            
-            # 排除空值
-            if new_value == "" or new_value is None:
-                continue
-            
-            schema_data[key] = new_value
-            
-            # 检查是否变化
-            original_value = original_data.get(key)
-            if new_value != original_value:
-                # 记录具体差异以便排查
-                # print(f"  [DEBUG] Field '{key}' changed: '{original_value}' -> '{new_value}'")
-                has_change = True
-        
-        # 2. 只有存在变化时才返回数据
-        if has_change or force_full_schema:
             return schema_data
         return {}
 
@@ -374,16 +383,12 @@ class BaseApiHandler(BaseNodeHandler[T]):
         new_data: Dict[str, Any],
         origin_data: Dict[str, Any],
     ) -> List[str]:
-        schema_fields = get_pydantic_model_fields(schema)
+        new_payload = self._get_update_schema_payload(schema, new_data, require_valid=True) or {}
-        if not schema_fields:
+        origin_payload = self._get_update_schema_payload(schema, origin_data, require_valid=False) or {}
-            return []
+        field_names = sorted(set(new_payload) | set(origin_payload))
-        changed: List[str] = []
+        return [field_name for field_name in field_names if new_payload.get(field_name) != origin_payload.get(field_name)]
-        for field_name in schema_fields.keys():
-            if new_data.get(field_name) != origin_data.get(field_name):
-                changed.append(field_name)
-        return changed
 
-    def _build_update_schema_status(
+    def build_update_schema_status(
         self,
         *,
         schema_name: str,
@@ -393,6 +398,7 @@ class BaseApiHandler(BaseNodeHandler[T]):
         will_update: bool,
         update_error: Optional[str] = None,
     ) -> str:
+        """Update 入口：生成 update schema 的状态说明文本。"""
         new_error = self._validate_schema(new_data, schema)
         origin_error = self._validate_schema(origin_data, schema)
         changed_fields = self._schema_changed_fields(schema, new_data, origin_data)

sync_state_machine/domain/construction/api_handler.py

@@ -190,7 +190,7 @@ class ConstructionTaskApiHandler(BaseApiHandler):
                     base_update_error = "show_name changed but task_type != QT"
 
             schema_status_lines.append(
-                self._build_update_schema_status(
+                self.build_update_schema_status(
                     schema_name="ConstructionUpdate",
                     schema=ConstructionUpdate,
                     new_data=data,
@@ -238,7 +238,7 @@ class ConstructionTaskApiHandler(BaseApiHandler):
                         plan_update_error = str(e)
 
             schema_status_lines.append(
-                self._build_update_schema_status(
+                self.build_update_schema_status(
                     schema_name="ConstructionPlanUpdate",
                     schema=ConstructionPlanUpdate,
                     new_data=data,

sync_state_machine/domain/construction_task_detail/api_handler.py

@@ -124,9 +124,9 @@ class ConstructionTaskDetailApiHandler(BaseApiHandler):
             
             origin_data = node.get_origin_data() or {}
             
-            # 使用 _get_schema_diff 检查差异并打印日志
+            # 使用 get_update_schema_diff 作为 update 入口检查差异并打印日志
             force_steps_update = self._steps_changed(node)
-            diff_fields = self._get_schema_diff(
+            diff_fields = self.get_update_schema_diff(
                 ConstructionDetailUpdate,
                 data,
                 origin_data,
@@ -145,7 +145,7 @@ class ConstructionTaskDetailApiHandler(BaseApiHandler):
                 continue
             
             # 需要完整的 schema 数据（包括必填字段）
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 data,
                 origin_data,
                 ConstructionDetailUpdate,

sync_state_machine/domain/contract/api_handler.py

@@ -256,7 +256,7 @@ class ContractApiHandler(BaseApiHandler):
             # 过滤出需要更新的字段（排除空值、未变化的字段）
             origin_data = node.get_origin_data() or {}
             force_steps_update = self._steps_changed(node)
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 new_data=data,
                 original_data=origin_data,
                 schema=ContractUpdate,

sync_state_machine/domain/contract_change/api_handler.py

@@ -93,7 +93,7 @@ class ContractChangeApiHandler(BaseApiHandler):
                 
             origin_data = node.get_origin_data() or {}
             force_steps_update = self._steps_changed(node)
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 node_data,
                 origin_data,
                 PostContractChange,

sync_state_machine/domain/contract_settlement/api_handler.py

@@ -140,7 +140,7 @@ class ContractSettlementApiHandler(BaseApiHandler):
             
             # 1. 基础信息更新 (ContractSettlementUpdate)
             force_steps_update = self._steps_changed(node)
-            base_diff = self._get_schema_diff(
+            base_diff = self.get_update_schema_diff(
                 ContractSettlementUpdate,
                 data,
                 origin_data,
@@ -167,7 +167,7 @@ class ContractSettlementApiHandler(BaseApiHandler):
                     error = f"API error: {e}"
             
             # 2. 计划信息更新 (ContractSettlementPlanUpdate)
-            plan_diff = self._get_schema_diff(ContractSettlementPlanUpdate, data, origin_data, node.node_id)
+            plan_diff = self.get_update_schema_diff(ContractSettlementPlanUpdate, data, origin_data, node.node_id)
             if not error and plan_diff:
                 try:
                     plan_model = ContractSettlementPlanUpdate.model_validate(data)

sync_state_machine/domain/contract_settlement_detail/api_handler.py

@@ -122,9 +122,9 @@ class ContractSettlementDetailApiHandler(BaseApiHandler):
             
             origin_data = node.get_origin_data() or {}
             
-            # 使用 _get_schema_diff 检查差异并打印日志
+            # 使用 get_update_schema_diff 作为 update 入口检查差异并打印日志
             force_steps_update = self._steps_changed(node)
-            diff_fields = self._get_schema_diff(
+            diff_fields = self.get_update_schema_diff(
                 ContractSettlementDetailUpdate,
                 data,
                 origin_data,
@@ -143,7 +143,7 @@ class ContractSettlementDetailApiHandler(BaseApiHandler):
                 continue
             
             # 需要完整的 schema 数据（包括必填字段）
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 data,
                 origin_data,
                 ContractSettlementDetailUpdate,

sync_state_machine/domain/lar/api_handler.py

@@ -118,7 +118,7 @@ class LarApiHandler(BaseApiHandler):
             
             for schema, api_func in update_configs:
                 # 获取过滤后的更新数据
-                update_data = self._filter_update_data(
+                    update_data = self.build_update_request_data(
                     node_data,
                     origin_data,
                     schema,

sync_state_machine/domain/lar_change/api_handler.py

@@ -104,7 +104,7 @@ class LarChangeApiHandler(BaseApiHandler):
                 continue
             origin_data = node.get_origin_data() or {}
             force_steps_update = self._steps_changed(node)
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 node_data,
                 origin_data,
                 LarChangeUpdateSchema,

sync_state_machine/domain/material/api_handler.py

@@ -106,7 +106,7 @@ class MaterialApiHandler(BaseApiHandler):
             
             # 1. 基础信息更新 (MaterialUpdate)
             force_steps_update = self._steps_changed(node)
-            base_diff = self._get_schema_diff(
+            base_diff = self.get_update_schema_diff(
                 MaterialUpdate,
                 data,
                 origin_data,
@@ -131,7 +131,7 @@ class MaterialApiHandler(BaseApiHandler):
                     error = f"{ERROR_VALIDATION_FAILED}: {e}"
             
             # 2. 计划信息更新 (MaterialPlanUpdate)
-            plan_diff = self._get_schema_diff(MaterialPlanUpdate, data, origin_data, node.node_id)
+            plan_diff = self.get_update_schema_diff(MaterialPlanUpdate, data, origin_data, node.node_id)
             if not error and plan_diff:
                 try:
                     plan_model = MaterialPlanUpdate.model_validate(data)

sync_state_machine/domain/material_detail/api_handler.py

@@ -144,9 +144,9 @@ class MaterialDetailApiHandler(BaseApiHandler):
                 
                 origin_data = node.get_origin_data() or {}
                 
-                # 使用 _get_schema_diff 检查差异并打印日志
+                # 使用 get_update_schema_diff 作为 update 入口检查差异并打印日志
                 force_steps_update = self._steps_changed(node)
-                diff_fields = self._get_schema_diff(
+                diff_fields = self.get_update_schema_diff(
                     MaterialDetailUpdate,
                     data,
                     origin_data,
@@ -165,7 +165,7 @@ class MaterialDetailApiHandler(BaseApiHandler):
                     continue
                 
                 # 需要完整的 schema 数据（包括必填字段）
-                update_data = self._filter_update_data(
+                update_data = self.build_update_request_data(
                     data,
                     origin_data,
                     MaterialDetailUpdate,

sync_state_machine/domain/personnel/api_handler.py

@@ -121,7 +121,7 @@ class PersonnelApiHandler(BaseApiHandler):
             
             # 1. 基础信息更新 (PowerUpdate)
             force_steps_update = self._steps_changed(node)
-            base_diff = self._get_schema_diff(
+            base_diff = self.get_update_schema_diff(
                 PowerUpdate,
                 data,
                 origin_data,

sync_state_machine/domain/personnel_detail/api_handler.py

@@ -111,9 +111,9 @@ class PersonnelDetailApiHandler(BaseApiHandler):
             
             origin_data = node.get_origin_data() or {}
             
-            # 使用 _get_schema_diff 检查差异并打印日志
+            # 使用 get_update_schema_diff 作为 update 入口检查差异并打印日志
             force_steps_update = self._steps_changed(node)
-            diff_fields = self._get_schema_diff(
+            diff_fields = self.get_update_schema_diff(
                 PowerDetailUpdate,
                 data,
                 origin_data,
@@ -132,7 +132,7 @@ class PersonnelDetailApiHandler(BaseApiHandler):
                 continue
             
             # 需要完整的 schema 数据（包括必填字段）
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 data,
                 origin_data,
                 PowerDetailUpdate,

sync_state_machine/domain/preparation/api_handler.py

@@ -94,7 +94,7 @@ class PreparationApiHandler(BaseApiHandler):
             
             origin_data = node.get_origin_data() or {}
             force_steps_update = self._steps_changed(node)
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 node_data,
                 origin_data,
                 PostPreparation,

sync_state_machine/domain/production/api_handler.py

@@ -99,7 +99,7 @@ class ProductionApiHandler(BaseApiHandler):
             
             # 获取过滤后的更新数据
             force_steps_update = self._steps_changed(node)
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 node_data,
                 origin_data,
                 PostProduction,

sync_state_machine/domain/project/api_handler.py

@@ -234,7 +234,7 @@ class ProjectApiHandler(BaseApiHandler):
             
             # 遍历所有更新 schema，检查差异并更新
             for schema, api_func in update_configs:
-                update_data = self._get_schema_diff(
+                update_data = self.get_update_schema_diff(
                     schema,
                     data,
                     original_data,
@@ -244,9 +244,9 @@ class ProjectApiHandler(BaseApiHandler):
                 if not update_data:
                     continue
                 
-                # 执行更新（差异已由 _get_schema_diff 打印）
+                # 执行更新（差异已由 get_update_schema_diff 打印）
                 try:
-                    full_update_data = self._filter_update_data(
+                    full_update_data = self.build_update_request_data(
                         data,
                         original_data,
                         schema,

sync_state_machine/domain/units/api_handler.py

@@ -94,7 +94,7 @@ class UnitsApiHandler(BaseApiHandler):
 
             origin_data = node.get_origin_data() or {}
             force_steps_update = self._steps_changed(node)
-            update_data = self._filter_update_data(
+            update_data = self.build_update_request_data(
                 node_data,
                 origin_data,
                 PostGeneratorUnits,

sync_state_machine/pipeline/factory.py

@@ -264,6 +264,7 @@ def _build_strategies(
         if runtime_cfg is not None:
             strategy.set_config(runtime_cfg.config.model_copy(deep=True))
             strategy.skip_sync = bool(runtime_cfg.skip_sync)
+            strategy.skip_post_check = bool(runtime_cfg.skip_post_check)
 
         strategies.append(strategy)
     return strategies

sync_state_machine/pipeline/full_sync_pipeline.py

@@ -509,8 +509,22 @@ class FullSyncPipeline:
         else:
             self._logger.info("🔄 Post-check: reloading all node types for final consistency evaluation...")
             for node_type in self.node_types:
+                strategy = next((item for item in self.strategies if item.node_type == node_type), None)
+                if strategy is not None and strategy.skip_post_check:
+                    self._logger.info("⏭️  Post-check reload skipped: node_type=%s", node_type)
+                    continue
                 await self._reload_node_type(node_type, reason="post-check final reload")
         for node_type in self.node_types:
+            strategy = next((item for item in self.strategies if item.node_type == node_type), None)
+            if strategy is not None and strategy.skip_post_check:
+                self._logger.info("⏭️  Post-check skipped: node_type=%s", node_type)
+                self._consistency_by_type[node_type] = {
+                    "ok": True,
+                    "checked_pairs": 0,
+                    "mismatch_count": 0,
+                    "skipped": True,
+                }
+                continue
             await self._evaluate_consistency_for_node_type(node_type)
 
         self.stats["consistency"] = {

sync_state_machine/sync_system/strategy.py

@@ -45,6 +45,7 @@ class BaseSyncStrategy(Generic[T]):
         skip_sync: bool - 如果为 True，则跳过该类型的 bind/create/update/sync 阶段
                           数据仍会被加载，但不会执行任何同步操作
                           适用于只需要加载数据供其他类型引用的场景（如 supplier）
+        skip_post_check: bool - 如果为 True，则跳过该类型最终 post-check 的 reload 与一致性校验
     """
     # 类变量：默认配置（子类可覆盖）
     default_config: StrategyConfig = StrategyConfig()
@@ -52,6 +53,8 @@ class BaseSyncStrategy(Generic[T]):
     schema: Type[T] = None  # type: ignore
     # 类变量：是否默认跳过同步（子类可覆盖）
     default_skip_sync: bool = False
+    # 类变量：是否默认跳过 post-check（子类可覆盖）
+    default_skip_post_check: bool = False
     
     def __init__(
         self, 
@@ -71,6 +74,8 @@ class BaseSyncStrategy(Generic[T]):
         self.config = self.default_config.model_copy(deep=True)
         # 是否跳过同步（可运行时修改）
         self.skip_sync = self.default_skip_sync
+        # 是否跳过 post-check（可运行时修改）
+        self.skip_post_check = self.default_skip_post_check
         # 统一由 Pipeline 注入 runtime；未注入时在执行阶段显式报错
         self.sm_runtime: Optional[StateMachineRuntime] = None
         self._schema_diff_validator: Optional[SchemaDiffValidator] = None

sync_state_machine/sync_system/strategy_ops/bind_ops.py

@@ -16,6 +16,12 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 
+def _stable_pick_bind_pair(local_candidates: List["SyncNode"], remote_candidates: List["SyncNode"]):
+    local_node = sorted(local_candidates, key=lambda item: ((item.data_id or ""), item.node_id))[0]
+    remote_node = sorted(remote_candidates, key=lambda item: ((item.data_id or ""), item.node_id))[0]
+    return local_node, remote_node
+
+
 async def run_bind(strategy, **kwargs):
     logger.info(f"[{strategy.node_type}] Starting Binding Pipeline...")
 
@@ -519,29 +525,78 @@ async def phase_auto_binding(strategy, local_nodes: List["SyncNode"], remote_nod
                                 }
                             )
 
-                if (len(l_remain) > 1 and len(r_remain) >= 1) or (len(l_remain) == 1 and len(r_remain) > 1):
+                many_local_one_remote = len(l_remain) > 1 and len(r_remain) == 1
-                    for n in l_remain:
+                one_local_many_remote = len(l_remain) == 1 and len(r_remain) > 1
-                        if n.binding_status == BindingStatus.MISSING:
+
-                            pending_auto_bind_updates.append(
+                if strategy.config.allow_many_to_one_auto_bind and (many_local_one_remote or one_local_many_remote):
-                                {
+                    chosen_local, chosen_remote = _stable_pick_bind_pair(l_remain, r_remain)
-                                    "node": n,
+
-                                    "outcome": "AMBIGUOUS",
+                    if chosen_local.binding_status == BindingStatus.MISSING:
-                                    "create_enabled": None,
+                        pending_auto_bind_updates.append(
-                                    "bind_remote_node_id": None,
+                            {
-                                }
+                                "node": chosen_local,
-                            )
+                                "outcome": "ONE_TO_ONE",
+                                "create_enabled": None,
+                                "bind_remote_node_id": chosen_remote.node_id,
+                            }
+                        )
+                    if chosen_remote.binding_status == BindingStatus.MISSING:
+                        pending_auto_bind_updates.append(
+                            {
+                                "node": chosen_remote,
+                                "outcome": "ONE_TO_ONE",
+                                "create_enabled": None,
+                                "bind_remote_node_id": None,
+                            }
+                        )
+
+                    for n in l_remain:
+                        if n.node_id == chosen_local.node_id or n.binding_status != BindingStatus.MISSING:
+                            continue
+                        pending_auto_bind_updates.append(
+                            {
+                                "node": n,
+                                "outcome": "ZERO",
+                                "create_enabled": local_create_enabled,
+                                "bind_remote_node_id": None,
+                            }
+                        )
 
-                if (len(r_remain) > 1 and len(l_remain) >= 1) or (len(r_remain) == 1 and len(l_remain) > 1):
                     for n in r_remain:
-                        if n.binding_status == BindingStatus.MISSING:
+                        if n.node_id == chosen_remote.node_id or n.binding_status != BindingStatus.MISSING:
-                            pending_auto_bind_updates.append(
+                            continue
-                                {
+                        pending_auto_bind_updates.append(
-                                    "node": n,
+                            {
-                                    "outcome": "AMBIGUOUS",
+                                "node": n,
-                                    "create_enabled": None,
+                                "outcome": "ZERO",
-                                    "bind_remote_node_id": None,
+                                "create_enabled": remote_create_enabled,
-                                }
+                                "bind_remote_node_id": None,
-                            )
+                            }
+                        )
+                else:
+                    if (len(l_remain) > 1 and len(r_remain) >= 1) or (len(l_remain) == 1 and len(r_remain) > 1):
+                        for n in l_remain:
+                            if n.binding_status == BindingStatus.MISSING:
+                                pending_auto_bind_updates.append(
+                                    {
+                                        "node": n,
+                                        "outcome": "AMBIGUOUS",
+                                        "create_enabled": None,
+                                        "bind_remote_node_id": None,
+                                    }
+                                )
+
+                    if (len(r_remain) > 1 and len(l_remain) >= 1) or (len(r_remain) == 1 and len(l_remain) > 1):
+                        for n in r_remain:
+                            if n.binding_status == BindingStatus.MISSING:
+                                pending_auto_bind_updates.append(
+                                    {
+                                        "node": n,
+                                        "outcome": "AMBIGUOUS",
+                                        "create_enabled": None,
+                                        "bind_remote_node_id": None,
+                                    }
+                                )
 
     for item in pending_auto_bind_updates:
         node = item["node"]
@@ -572,3 +627,25 @@ async def phase_auto_binding(strategy, local_nodes: List["SyncNode"], remote_nod
                 reason = f"{reason} | detail={detail}"
             node.error = reason
             logger.debug(f"[{strategy.node_type}] 自动绑定阻断: node={node.node_id}, reason={reason}")
+
+    outcome_counts: Dict[str, int] = {}
+    create_enabled_count = 0
+    bound_pairs = 0
+    for item in pending_auto_bind_updates:
+        outcome = str(item.get("outcome") or "NONE")
+        outcome_counts[outcome] = outcome_counts.get(outcome, 0) + 1
+        if item.get("create_enabled"):
+            create_enabled_count += 1
+        if item.get("bind_remote_node_id"):
+            bound_pairs += 1
+
+    if pending_auto_bind_updates:
+        ordered = ", ".join(f"{key}={outcome_counts[key]}" for key in sorted(outcome_counts))
+        logger.info(
+            "[%s] Auto-bind summary: candidates=%d, bind_pairs=%d, create_enabled=%d, outcomes={%s}",
+            strategy.node_type,
+            len(pending_auto_bind_updates),
+            bound_pairs,
+            create_enabled_count,
+            ordered,
+        )

tests/integration/test_strategy_business_points_migrated.py

@@ -193,6 +193,30 @@ async def test_auto_binding_skip_on_ambiguous_migrated(setup_env):
     assert await bm.get_local_id("test_project", "r1") is None
 
 
+@pytest.mark.asyncio
+async def test_auto_binding_many_to_one_can_bind_stable_pick_and_leave_rest_for_create(setup_env):
+    local, remote, bm, _ = setup_env
+
+    strategy = TestProjectStrategy("test_project", local, remote, bm)
+    strategy.update_config(
+        auto_bind=True,
+        auto_bind_fields=["code"],
+        depend_fields={},
+        local_orphan_action=OrphanAction.CREATE_REMOTE,
+        allow_many_to_one_auto_bind=True,
+    )
+
+    await local.add(build_project_node("l2", "P2", name="B", code="AMB-2"))
+    await local.add(build_project_node("l1", "P1", name="A", code="AMB-2"))
+    await remote.add(build_project_node("r1", "RP1", name="A", code="AMB-2"))
+
+    await strategy.bind()
+
+    assert await bm.get_remote_id("test_project", "l1") == "r1"
+    assert await bm.get_remote_id("test_project", "l2") is None
+    assert await bm.get_local_id("test_project", "r1") == "l1"
+
+
 @pytest.mark.asyncio
 async def test_pre_bind_data_id_works_when_auto_bind_disabled(setup_env):
     local, remote, bm, _ = setup_env

tests/unit/test_base_api_handler_update_schema_helpers.py

@@ -0,0 +1,94 @@
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel
+
+from sync_state_machine.datasource.api.handler import BaseApiHandler
+from sync_state_machine.datasource.task_result import TaskResult
+
+
+class _UpdateSchema(BaseModel):
+    id: str
+    required_value: float
+    optional_text: str | None = None
+
+
+class _DummyApiHandler(BaseApiHandler[BaseModel]):
+    _node_type = "dummy"
+    _node_class = object  # type: ignore[assignment]
+    _schema = BaseModel
+
+    async def create_all(self, nodes):
+        return [TaskResult.success(node_id="dummy")]
+
+    async def update_all(self, nodes):
+        return [TaskResult.success(node_id="dummy")]
+
+    async def delete_all(self, nodes):
+        return [TaskResult.success(node_id="dummy")]
+
+    async def load(self):
+        return []
+
+
+def test_get_update_schema_diff_falls_back_to_schema_fields_when_origin_is_incomplete() -> None:
+    handler = _DummyApiHandler()
+
+    diff = handler.get_update_schema_diff(
+        _UpdateSchema,
+        {"id": "node-1", "required_value": 4.0, "optional_text": "ok"},
+        {"id": "node-1"},
+        node_id="node-1",
+    )
+
+    assert diff == {"required_value": 4.0, "optional_text": "ok"}
+
+
+def test_build_update_request_data_uses_same_schema_projection_as_diff() -> None:
+    handler = _DummyApiHandler()
+
+    payload = handler.build_update_request_data(
+        {"id": "node-1", "required_value": 4.0, "optional_text": "ok", "ignored": "x"},
+        {"id": "node-1"},
+        schema=_UpdateSchema,
+    )
+
+    assert payload == {"id": "node-1", "required_value": 4.0, "optional_text": "ok"}
+
+
+def test_schema_changed_fields_matches_update_payload_comparison() -> None:
+    handler = _DummyApiHandler()
+
+    changed_fields = handler._schema_changed_fields(
+        _UpdateSchema,
+        {"id": "node-1", "required_value": 4.0, "optional_text": "ok"},
+        {"id": "node-1", "required_value": 4.0},
+    )
+
+    assert changed_fields == ["optional_text"]
+
+
+def test_update_schema_payload_filters_empty_values() -> None:
+    handler = _DummyApiHandler()
+
+    payload = handler._get_update_schema_payload(
+        _UpdateSchema,
+        {"id": "node-1", "required_value": 4.0, "optional_text": ""},
+        require_valid=False,
+    )
+
+    assert payload == {"id": "node-1", "required_value": 4.0}
+
+
+def test_get_update_schema_diff_skips_schema_when_new_data_is_still_incomplete() -> None:
+    handler = _DummyApiHandler()
+
+    diff = handler.get_update_schema_diff(
+        _UpdateSchema,
+        {"id": "node-1"},
+        {"id": "node-1", "required_value": 2.0},
+        node_id="node-1",
+    )
+
+    assert diff is None

tests/unit/test_full_sync_pipeline_downstream_reload.py

@@ -31,6 +31,7 @@ class _StubStrategy:
     def __init__(self, node_type: str):
         self.node_type = node_type
         self.skip_sync = False
+        self.skip_post_check = False
         self.config = SimpleNamespace(
             depend_fields={},
             update_direction=None,
@@ -193,4 +194,55 @@ async def test_evaluate_consistency_merges_compare_and_post_check_ignore_fields(
         full_sync_pipeline_module.evaluate_consistency_for_node_type = original
 
     assert captured["ignore_fields"] == ["updated_at", "code", "audit_status"]
-    assert result["ignore_fields"] == ["updated_at", "code", "audit_status"]
+    assert result["ignore_fields"] == ["updated_at", "code", "audit_status"]
+
+
+@pytest.mark.asyncio
+async def test_phase_post_check_skips_configured_node_types(monkeypatch: pytest.MonkeyPatch) -> None:
+    supplier_strategy = _StubStrategy("supplier")
+    supplier_strategy.skip_post_check = True
+    project_strategy = _StubStrategy("project")
+
+    pipeline = FullSyncPipeline(
+        local_datasource=_FakeDataSource(),
+        remote_datasource=_FakeDataSource(),
+        strategies=[supplier_strategy, project_strategy],
+        persistence=_FakePersistence(),
+        local_collection=DataCollection("local"),
+        remote_collection=DataCollection("remote"),
+        binding_manager=BindingManager(_FakePersistence(), auto_persist=False),
+        node_types=["supplier", "project"],
+        load_order=["supplier", "project"],
+        sync_order=["supplier", "project"],
+        enable_persistence=False,
+    )
+
+    reload_calls: list[str] = []
+    evaluated: list[str] = []
+
+    async def fake_reload(node_type: str, *, reason: str) -> None:
+        del reason
+        reload_calls.append(node_type)
+
+    async def fake_evaluate(node_type: str):
+        evaluated.append(node_type)
+        return {"ok": True, "checked_pairs": 1, "mismatch_count": 0}
+
+    async def fake_print_summary() -> None:
+        return None
+
+    monkeypatch.setattr(pipeline, "_reload_node_type", fake_reload)
+    monkeypatch.setattr(pipeline, "_evaluate_consistency_for_node_type", fake_evaluate)
+    monkeypatch.setattr(pipeline, "print_summary", fake_print_summary)
+
+    result = await pipeline.phase_post_check()
+
+    assert result is True
+    assert reload_calls == ["project"]
+    assert evaluated == ["project"]
+    assert pipeline._consistency_by_type["supplier"] == {
+        "ok": True,
+        "checked_pairs": 0,
+        "mismatch_count": 0,
+        "skipped": True,
+    }

tests/unit/test_strategy_runtime_config.py

@@ -8,6 +8,7 @@ def test_strategy_runtime_config_skip_sync_defaults_false() -> None:
     runtime_config = StrategyRuntimeConfig(node_type="project")
 
     assert runtime_config.skip_sync is False
+    assert runtime_config.skip_post_check is False
 
 
 def test_apply_strategy_overrides_allows_skip_sync_override() -> None:
@@ -16,6 +17,7 @@ def test_apply_strategy_overrides_allows_skip_sync_override() -> None:
         strategy_overrides={
             "project": {
                 "skip_sync": True,
+                "skip_post_check": True,
             }
         },
     )
@@ -23,6 +25,7 @@ def test_apply_strategy_overrides_allows_skip_sync_override() -> None:
     assert len(resolved) == 1
     assert resolved[0].node_type == "project"
     assert resolved[0].skip_sync is True
+    assert resolved[0].skip_post_check is True
 
 
 def test_strategy_config_supports_both_post_check_ignore_fields() -> None:
@@ -30,8 +33,10 @@ def test_strategy_config_supports_both_post_check_ignore_fields() -> None:
         {
             "post_check_ignore_fields": ["code"],
             "post_check_ignore_list_item_fields": {"plan_node": ["is_audit"]},
+            "allow_many_to_one_auto_bind": True,
         }
     )
 
     assert config.post_check_ignore_fields == ["code"]
-    assert config.post_check_ignore_list_item_fields == {"plan_node": ["is_audit"]}
+    assert config.post_check_ignore_list_item_fields == {"plan_node": ["is_audit"]}
+    assert config.allow_many_to_one_auto_bind is True