export interface SessionLogRetentionSummary {
    pruned: number;
    bytesPruned: number;
    disabled: boolean;
    retentionDays: number | null;
    /**
     * Whether this call actually walked the tree. False when retention is off or
     * when a sweep already ran inside the interval, so a caller can tell "nothing
     * was old enough" apart from "we did not look".
     */
    swept: boolean;
    warnings: string[];
}
/**
 * Parse `HQ_SESSION_LOG_LOCAL_RETENTION_DAYS`.
 *
 * Unset → 7. Integer ≥ 1 → that many days. Literal `off` → disabled.
 * Empty / whitespace / 0 / negative / anything else → warn and use 7.
 * Uses `?.trim() ||` so a set-but-empty value is treated as unset-for-value
 * (still warned, because the variable was present).
 */
export declare function resolveSessionLogLocalRetentionDays(rawEnv?: string | undefined): {
    days: number | null;
    warning: string | null;
};
/**
 * Parse `HQ_SESSION_LOG_RETENTION_SWEEP_HOURS`.
 *
 * Unset -> 24. Integer >= 1 -> that many hours. `0` -> sweep on every call.
 * Empty / whitespace / negative / anything else -> warn and use 24.
 */
export declare function resolveSessionLogSweepIntervalHours(rawEnv?: string | undefined): {
    hours: number;
    warning: string | null;
};
/**
 * Where this machine remembers the last sweep, keyed by HQ root so two roots
 * on one machine throttle independently. Local bookkeeping, deliberately
 * outside the tree: `workspace/.session-logs/` is push-only synced, and a
 * marker written there would be uploaded to the vault as content.
 */
export declare function sessionLogSweepMarkerPath(root: string): string;
export declare function formatSessionLogRetentionLine(summary: SessionLogRetentionSummary): string | null;
/**
 * Delete local session-log copies that are confirmed in the personal vault
 * and older than the retention window. Best-effort: never throws.
 */
export declare function pruneSyncedSessionLogs(root: string): SessionLogRetentionSummary;
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