pub fn diff_at(
vault_path: &Path,
profile: &str,
at_millis: i64,
) -> SafeResult<Vec<SnapDiffEntry>>Expand description
Compare the on-disk vault file at vault_path against the most-recent
snapshot taken at or before at_millis (UTC milliseconds since epoch).
The diff is computed by comparing the raw JSON secrets maps; secret values
are not decrypted — only key presence and ciphertext equality are
checked.
Returns NoSnapshotAvailable if no snapshot exists at or before
at_millis.