First tests with uploading via CSV and it looks like it is creating new locations for all of the cities. Since the site will be a hyper-local focus, I had already added all of the locations.
Based on the Lat/Long coordinates, it looks like the duplicate cities are based on the first entry for that respective city in the CSV. Looking in the SQL location table, a new ID is created for the city, though the slug stays the same for both versions.
Not entirely sure if this is related, but I had also setup 76 categories across 10 CPTs, which all seemed to have disappeared. I hadn’t looked in there before attempting the upload, so not sure if they had disappeared prior to this for some other reason.
Going to be uploading around 4,000 or so listings, so want to avoid trying to merge locations or other issues.
cheers