Assets: Clean up Upload-Directories

I’m using Assets almost since day one. And 7 years ago was, well, a whole other time. 😉 Many things changed, but the Assets-Configuration on one quite large project stayed the same since. Those days we configured many individual Upload-Folders. Nowadays, we actually only need a few of them. So we want to «clean up» our assets and upload-dirs.

Is there a easy way to do that? There are 9 different upload-dirs we do use with Assets. We now would like to merge 8 of them to one, so we would have only two dirs left.

What’s the easiest way to do that? I guess I have to move the files on the server and re-index everything in the controlpanel, and somehow update all the filedirs in the DB … right? But how? 🙈 😊