I tried the update code but get this error:
ERROR: Cannot ADD column total_weight because it already exists.
Is it better to run the 0.2b sql file instead of this one line?
This isn't my mod, but it sounds like the field is already there, so I would just remove that line from the code, and rerun it. You may already have all the fields you need in all the files, and just need the updated program files.