update

client/core/persistence/PersistentBinaryObject.h

@@ -22,6 +22,12 @@ protected:
     virtual quint32 recordFormatVersion() const = 0;
     virtual void writeBody(QDataStream& ds) const = 0;
     virtual bool readBody(QDataStream& ds) = 0;
+
+    /// 读取文件时解析到的版本号（<= recordFormatVersion）。用于向后兼容读取分支。
+    [[nodiscard]] quint32 loadedRecordFormatVersion() const { return m_loadedVersion; }
+
+private:
+    quint32 m_loadedVersion = 0;
 };
 
 }  // namespace core