/**
 * A stable identifier that survives everything the human-facing id does not.
 *
 * ISS-NNNN is a display name: it is derived from a directory scan, it is
 * reassigned when duplicates are repaired (four were, in Phase 2), and it is
 * allocated independently per checkout — which is exactly how the same issue
 * came to exist as ISS-0112 on one volume and ISS-0115 on another with nothing
 * in the data connecting them. `uid` is the identity; `id` is the label.
 *
 * UUIDv7 rather than v4 because it is time-ordered: records sort by creation
 * without consulting a timestamp field, and a Postgres index on it stays local
 * rather than scattering writes across the tree when this reaches HQ sync.
 */
export declare function newUid(now?: number): string;
export declare function isUid(value: unknown): value is string;
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