import type { Database as DatabaseType } from "better-sqlite3";
import type { Repositories } from "../repositories/index.js";
/**
 * Handles compaction of old session data — both auto-compact (session start)
 * and manual compact (user-triggered).
 */
export declare class CompactionService {
    private db;
    private repos;
    constructor(db: DatabaseType, repos: Repositories);
    /**
     * Auto-compaction: runs at session start if total completed sessions exceed threshold.
     * Returns true if compaction was performed.
     */
    autoCompact(threshold: number): boolean;
    /**
     * Manual compaction with dry-run support.
     */
    manualCompact(keepSessions: number, maxAgeDays?: number, dryRun?: boolean): {
        sessionsCompacted: number;
        changesSummarized: number;
        backupPath?: string;
    };
    private compactBeforeCutoff;
    private countCompactableSessions;
}
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