/**
 * Commit-log pruning (SPEC.md §4.6) — normative retention floors.
 *
 * The horizon never advances past `min(active-client cursors)` (clients
 * whose cursor record was touched within the active window), except that
 * commits older than the age-force limit may be pruned regardless; at
 * least the newest `minRetainedCommits` commits are always retained.
 */
import { type SyncularServerEvents } from './events.js';
import type { ServerStorage } from './storage.js';
export interface RetentionPolicy {
    /** Active window for laggard cursors (default 14 days). */
    readonly activeWindowMs: number;
    /** Force-advance past commits older than this (default 30 days). */
    readonly ageForceMs: number;
    /** Always retain at least this many newest commits (default 1000). */
    readonly minRetainedCommits: number;
}
export declare const DEFAULT_RETENTION: RetentionPolicy;
export interface PruneOptions {
    readonly storage: ServerStorage;
    readonly partition: string;
    readonly nowMs: number;
    readonly retention?: Partial<RetentionPolicy>;
    /** Optional structured-events sink (`prune.completed`). */
    readonly events?: SyncularServerEvents;
}
/** Advance the horizon per §4.6 and delete commits at or below it. */
export declare function pruneCommitLog(options: PruneOptions): Promise<number>;