[Potential feature request] Build an archive / `sqlite3` file without making requests to a given site

[Vetches]

Hi! I just found out that one of the configs I have never set up an archive property, so the accounts I've been downloading from (Instagram, in my case), never got archived. While this is fine for now since I have the files locally, if I ever move the files elsewhere, gallery-dl doesn't have any archive to reference to avoid re-downloading.

Is there a way to build an archive / sqlite3 file without revisiting the sites and instead solely use files found locally? I download the JSON of each post if that helps! Any insight on this would be greatly appreciated, thanks so much!