fix: BOM草稿模块缺陷修复（事务回滚 + 外键约束 + 前端状态清理）

inventory-backend/app/services/bom_service.py

@@ -431,27 +431,31 @@ class BomService:
 
     @staticmethod
     def create_or_update_bom(parent_id, child_list, bom_no=None, version='V1.0'):
-        if not bom_no:
-            existing = BomTable.query.filter_by(parent_id=parent_id).first()
-            bom_no = existing.bom_no if existing else BomService.generate_bom_no()
+        try:
+            if not bom_no:
+                existing = BomTable.query.filter_by(parent_id=parent_id).first()
+                bom_no = existing.bom_no if existing else BomService.generate_bom_no()
 
-        # 改为对象级删除以触发审计事件
-        old_records = BomTable.query.filter_by(bom_no=bom_no, version=version).all()
-        for rec in old_records:
-            db.session.delete(rec)
+            # 改为对象级删除以触发审计事件
+            old_records = BomTable.query.filter_by(bom_no=bom_no, version=version).all()
+            for rec in old_records:
+                db.session.delete(rec)
 
-        for item in child_list:
-            bom = BomTable(
-                bom_no=bom_no, version=version, parent_id=parent_id,
-                child_id=item['child_id'], dosage=item.get('dosage', 0), remark=item.get('remark', '')
-            )
-            db.session.add(bom)
-        db.session.commit()
-
-        # ===== 写入后立刻清除缓存（Cache Invalidation） =====
-        _cache_delete(bom_no, version)
-        logger.info(f"[BOM Cache] create_or_update_bom → 缓存已失效 bom_no={bom_no} version={version}")
+            for item in child_list:
+                bom = BomTable(
+                    bom_no=bom_no, version=version, parent_id=parent_id,
+                    child_id=item['child_id'], dosage=item.get('dosage', 0), remark=item.get('remark', '')
+                )
+                db.session.add(bom)
+            db.session.commit()
 
+            # ===== 写入后立刻清除缓存（Cache Invalidation） =====
+            _cache_delete(bom_no, version)
+            logger.info(f"[BOM Cache] create_or_update_bom → 缓存已失效 bom_no={bom_no} version={version}")
+        except Exception as e:
+            db.session.rollback()
+            logger.error(f"[BOM] create_or_update_bom 失败 bom_no={bom_no}: {e}")
+            raise
         return True
 
     @staticmethod