/**
 * The sealer's capture backlog, read-only (T13029, T13036).
 *
 * Its own module so `cleo doctor` reads the backlog without importing the
 * sealer itself.
 *
 * @module store/sync/seal-backlog
 * @task T13036
 * @epic T12323
 */
import type { DatabaseSync } from 'node:sqlite';
/**
 * The capture backlog, for `cleo doctor`: live captures, and the oldest
 * one's seq and age. A head that stays put across seals is stuck. Read-only.
 */
export declare function sealBacklog(db: DatabaseSync): {
    readonly live: number;
    readonly oldestSeq: number | null;
    readonly oldestAtMs: number | null;
};
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