cannot handle the situation where the dbc file has commented headers.

When a dbc file has a comment header, as follows

<img width="1452" height="834" alt="Image" src="https://github.com/user-attachments/assets/0cc6a297-3b33-4eac-9110-131cc58689ff" />
The analysis will go wrong.

<img width="549" height="60" alt="Image" src="https://github.com/user-attachments/assets/9a21a5a8-e8aa-4bd2-8789-9ff74202e8f3" />