diff --git a/inventory-backend/app/models/transaction.py b/inventory-backend/app/models/transaction.py
index ab0c614..0adab1f 100644
--- a/inventory-backend/app/models/transaction.py
+++ b/inventory-backend/app/models/transaction.py
@@ -199,6 +199,8 @@ class TransScrap(db.Model):
     approval_status = db.Column(db.String(20), default='pending')
     cost_at_scrap = db.Column(db.Numeric(19, 4))
     total_loss = db.Column(db.Numeric(19, 4))
+    # ★ 关联报废申请单号（审批流写台账用；DDL 见 db_migrations/add_scrap_approval.sql）
+    scrap_request_no = db.Column(db.String(100), index=True)
 
     def to_dict(self):
         return {