I don't think I fully understand what you're asking here. Are you wanting to blank the field or change them all to something else?
Yes i want to make it blank.
I think he refers to, how to delete the history of paths populated over time.
Even when the Path doesn't exist anymore or its invalid, it still is on the list.
I have the same question, "if" that is the question
I would strongly discourage that route. You are very likely going to run into key constraint issues in the database or worse, corrupt the packages share. If you can provide more information, what is the problem you are trying to solve? I have done quite a bit of database manipulation with the distribution packages and might be able to help fix the underlying issue.