Perhaps I just couldn't follow your thinking, but I found the last part of the README a bit confusing, where it talks about heliotrope-add: "To add messages from existing GMail, IMAP, mbox or maildir sources..."
It mentions using heliotrope-add, with --state-file to add messages at a regular interval, but then in the while loop it is using heliotrope-import and no --stat-file.
Perhaps I just couldn't follow your thinking, but I found the last part of the README a bit confusing, where it talks about heliotrope-add: "To add messages from existing GMail, IMAP, mbox or maildir sources..."
It mentions using heliotrope-add, with --state-file to add messages at a regular interval, but then in the while loop it is using heliotrope-import and no --stat-file.