export interface LastReportRecord {
    /** ISO timestamp of the most recent report (manual /skillfm OR daily cron). */
    last_report_at: string;
    /** What triggered the last report — useful for telemetry / debugging. */
    trigger: 'manual_slash_command' | 'daily_cron' | 'unknown';
    /** Schema version, for future migrations. */
    schema_version: 1;
}
export declare function lastReportFilePath(): string;
/**
 * Read the last-report record. Returns null if not present (caller should
 * fall back to a sensible default like 24h ago).
 */
export declare function readLastReport(): Promise<LastReportRecord | null>;
/**
 * Write the last-report record. Caller usually does this right after
 * surfacing the report rendered text.
 */
export declare function writeLastReport(record: Omit<LastReportRecord, 'schema_version'>): Promise<void>;
/**
 * Resolve the "since" cutoff for the manual scan: prior last_report_at if
 * present, otherwise (now - DEFAULT_FALLBACK_HOURS).
 */
export declare function resolveSinceCutoff(now?: Date): Promise<Date>;
/** Compute hours-since-last-report (rounded up to integer for sinceHours arg). */
export declare function hoursSince(since: Date, now?: Date): number;
/**
 * Render a short human-readable scan-window line for the report header,
 * e.g. "扫描期间: 2026-05-09 04:30 ~ 2026-05-09 09:15 UTC (4h45m)".
 */
export declare function renderScanWindowLine(since: Date, now?: Date): string;
//# sourceMappingURL=last-report.d.ts.map