Function versioned_edge_key

nodedb/src/engine/graph/edge_store/temporal/keys.rs:77–93

Build a versioned edge key. Returns an error if `system_from` is negative — key ordering semantics require a non-negative suffix.

(
    collection: &str,
    src: &str,
    label: &str,
    dst: &str,
    system_from: i64,
)

/// Returns an error if `system_from` is negative — key ordering semantics
/// require a non-negative suffix.
pub fn versioned_edge_key(
    collection: &str,
    src: &str,
    label: &str,
    dst: &str,
    system_from: i64,
) -> crate::Result<String> {
    if system_from < 0 {
        return Err(crate::Error::BadRequest {
            detail: format!("versioned_edge_key: negative system_from={system_from}"),
        });
    }
    Ok(format!(
        "{collection}\x00{src}\x00{label}\x00{dst}\x00{system_from:0width$}",
        width = SYSTEM_TIME_WIDTH
    ))
}

/// Build the version-range prefix for a base edge.
pub fn edge_version_prefix(collection: &str, src: &str, label: &str, dst: &str) -> String {