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Running old site at the same time

Hello all!
I’m rebuilding my blog and have more than 10k blog posts, which means the WF CMS isn’t going to cut it.

A solution I thought could work was to have my old site just run, and style it to match my new content - and then just leave most of my old posts there. Then I’ll write a script for the CMS API offloading older articles to my old database when needed. This way I’ll have static pages for my blog posts, running from my old database.

My question is if this is at all possible. Can I have my old site running or will the WF stuff force redirects and 404s?