feat:回退版本报错的问题

test/common/printer_task_test.dart

@@ -143,4 +143,34 @@ void main() {
       throwsA(isA<DatabaseException>()),
     );
   });
+
+  test('13到14迁移补指令列且列已存在时可重入', () async {
+    final database =
+        await databaseFactoryFfi.openDatabase(inMemoryDatabasePath);
+    addTearDown(database.close);
+    await database.execute('''
+      CREATE TABLE print_history (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        orderId TEXT NOT NULL,
+        serviceOrderId TEXT NOT NULL,
+        servicePrintId TEXT NOT NULL,
+        invoiceUrl TEXT NOT NULL,
+        status TEXT NOT NULL,
+        printTime TEXT,
+        syncTime TEXT,
+        createTime TEXT NOT NULL
+      )
+    ''');
+
+    await DatabaseMigration.migration13To14.migrate(database);
+
+    final columns = await database.rawQuery('PRAGMA table_info(print_history)');
+    expect(
+      columns.map((column) => column['name']),
+      contains('printCmd'),
+    );
+
+    // 外部存储旧库可能已带该列（中间态构建建库、降级重建），重复迁移不得抛 duplicate column。
+    await DatabaseMigration.migration13To14.migrate(database);
+  });
 }