fix: 历史费用状态修正为「计入费用」

- data_fixes 新增 migrate_fix_expense_status
- 将 NULL/空/待审批 的费用状态统一修正为「计入费用」
- 服务启动时自动执行，幂等安全
- 版本号 v1.0.0.6

backend/migrations/data_fixes.py

@@ -92,3 +92,23 @@ def migrate_fix_service_fee_standard():
             print(f"[migrate] project_finances: {affected} 条记录 service_fee_standard 修正为 5")
     finally:
         conn.close()
+
+
+def migrate_fix_expense_status():
+    """修正 expense_records 中空的 status 为默认值「计入费用」"""
+    from db import db
+
+    conn = db()
+    try:
+        cur = conn.cursor()
+        cur.execute(
+            "UPDATE expense_records SET status='计入费用' "
+            "WHERE status IS NULL OR status='' OR status='待审批'"
+        )
+        affected = cur.rowcount
+        cur.close()
+        if affected:
+            conn.commit()
+            print(f"[migrate] expense_records: {affected} 条记录 status 修正为 '计入费用'")
+    finally:
+        conn.close()