Function issue_link 

pub async fn issue_link(
    state: &AppState,
    address: &str,
    next: &str,
    audit: Option<AuditLink<'_>>,
) -> Result<LinkOutcome, AppError>

Stores a magic-link token for address and emails the link. With an audit, the link also carries the audit’s crawl id, and using it attaches the audited site to the account. Those links are capped per audit and per recipient (see quick::create_unlock_token).