Function keep_moved 

pub fn keep_moved(
    root: &Path,
    part: &str,
    file: &str,
    path: &Path,
    now_ms: i64,
) -> Result<u64, String>

A file another device’s change takes out, moved here as it is: nothing copied (it was going anyway), and no reference to its content, which leaves the sharing folder as soon as every device that counts read that it was taken out (share::removed_due): this version stays its 30 days. Copied (keep) when it cannot be moved (another disk: on a phone, the notes are in its shared storage, the history in Sioul’s own), and when the file has other names (hard links): moved, the history would hold the one file they share, and make it yours alone under each. The bytes it copied (0 when moved), for the exchange’s bound on copies (share::TAKE_OUT_COPIES).