/**
 * The pure half of the uniform timestamp format (journal spec §1.8, R3, M4;
 * T12986): the strict canonicalizer and the captured timestamp columns. It
 * has no runtime imports, so the Gate B fingerprint script
 * (`scripts/fingerprint-store.mjs --canon-timestamps`) loads this file
 * directly and applies the very function the sealer applies on the wire
 * (T12987). {@link module:store/sync/timestamps} re-exports it.
 *
 * @module store/sync/timestamp-canon
 * @task T12986
 * @task T12987
 */
import type { TableScope } from '@cleocode/contracts';
/**
 * The canonical wire form of a stored timestamp,
 * `YYYY-MM-DDTHH:MM:SS.sssZ`, or `null` when the value is refused.
 *
 * Fractions beyond milliseconds are truncated, never rounded, so a carry can
 * never change the second. Pure: two replicas always agree.
 *
 * @example
 * ```ts
 * canonicalStoreTimestamp('2026-09-14 19:56:01');          // '2026-09-14T19:56:01.000Z'
 * canonicalStoreTimestamp('2026-09-14T21:56:01.5+02:00');  // '2026-09-14T19:56:01.500Z'
 * canonicalStoreTimestamp('2026-09-14T19:56:01');          // null (zoneless)
 * canonicalStoreTimestamp('2026-09-14');                   // null (date only)
 * ```
 */
export declare function canonicalStoreTimestamp(value: string): string | null;
/**
 * Captured TEXT timestamp columns per sync-set table. The claim-lease columns
 * (`claimed_at`, `lease_expires_at`) are local-only and are not captured, so
 * they are not here. INTEGER epoch-millisecond columns (`brain_attention`,
 * `brain_decisions.validator_run_at`, `brain_session_narrative.last_updated_at`)
 * are already canonical and are not here either. A test pins this map, plus
 * an explicit list of those integer columns, against every captured `*_at`
 * column of both sync sets.
 */
export declare const SYNC_TIMESTAMP_COLUMNS: Readonly<Record<TableScope, Readonly<Record<string, readonly string[]>>>>;
/**
 * Columns the one-time rewrite never touches: `tasks_tasks.updated_at` is the
 * #1698 CAS token, and rewriting it would invalidate a caller's `--if-match`.
 */
export declare const CANON_EXCLUDED_COLUMNS: Readonly<Record<TableScope, Readonly<Record<string, readonly string[]>>>>;
/** The captured timestamp columns of `table` (empty when it has none). */
export declare function timestampColumns(scope: TableScope, table: string): ReadonlySet<string>;
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