/**
 * Build the displaced-label format used by `renameVersion({ swap: true })`:
 * `<newLabel>-prev-YYYYMMDDHHMMSS-<displacedId>`. The trailing version ID
 * makes the label unique within a workspace even if two swaps land in the
 * same UTC second.
 */
export declare function generatePrevLabel(newLabel: string, displacedId: number): string;
/**
 * Map a PostgreSQL unique-violation (`23505`) on the version-label index
 * to a clear public error. Other errors pass through unchanged.
 */
export declare function mapVersionLabelUniqueViolation(e: unknown, label: string): unknown;
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