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New Ruby on Rails website using data fron old Ruby on Rails website

I am quite new to Ruby on Rails. I have an old website done with Ruby on Rails and PostgreSQL, and I would like to create a new and cleaner website for the app, but re-using the data of my old website.

Before really starting, what is the best way to proceed?

• Create the new website and import the old databases?
• Take the old website as a start and begin "erasing" and/or rewriting the website?

It is a almost 7 years website done by a lot of various coders, messy code and a lot of functionalities that we won't use. As for myself, I would prefer to a new website and use the data, but I am not sure about what I have to check.

I have checked other threads, but it is still not clear for me.