I've added timestamps to the sidecars system. You can import/export any timestamp the file has, so it is now possible to migrate various times (particularly archive and imported) from one client to another. I still need to add some more things to sidecars, e.g. inbox status and ratings, but we are almost at the point where we can do complete client-to-client transfers of all the major metadata. I have plans to make this ultimate goal simple with templated one-click jobs and no need to repeat the file import--just a raw JSON file metadata import/export.