/**
 * SyncHistoryRepository - Tracks sync operation history
 *
 * Records each sync run with timing, counts, and status for monitoring.
 */
import type { Database as DatabaseType } from '../db/database-interface.js';
/**
 * Sync run status
 */
export type SyncStatus = 'running' | 'success' | 'failed' | 'partial';
/**
 * Sync history entry
 */
export interface SyncHistoryEntry {
    id: string;
    startedAt: string;
    completedAt: string | null;
    status: SyncStatus;
    skillsAdded: number;
    skillsUpdated: number;
    skillsUnchanged: number;
    errorMessage: string | null;
    durationMs: number | null;
    createdAt: string;
}
/**
 * Sync result for completing a run
 */
export interface SyncRunResult {
    skillsAdded: number;
    skillsUpdated: number;
    skillsUnchanged: number;
}
/**
 * Repository for sync history tracking
 */
export declare class SyncHistoryRepository {
    private db;
    private stmts;
    constructor(db: DatabaseType);
    /**
     * Ensure sync_history table exists
     */
    private ensureTable;
    private prepareStatements;
    private rowToEntry;
    /**
     * Start a new sync run
     * @returns The sync run ID
     */
    startRun(): string;
    /**
     * Complete a sync run successfully
     */
    completeRun(id: string, result: SyncRunResult): void;
    /**
     * Mark a sync run as partially complete (some errors)
     */
    completeRunPartial(id: string, result: SyncRunResult, errorMessage: string): void;
    /**
     * Mark a sync run as failed
     */
    failRun(id: string, error: string): void;
    /**
     * Get a specific sync run by ID
     */
    getById(id: string): SyncHistoryEntry | null;
    /**
     * Get sync history (most recent first)
     */
    getHistory(limit?: number): SyncHistoryEntry[];
    /**
     * Get the last successful sync run
     */
    getLastSuccessful(): SyncHistoryEntry | null;
    /**
     * Get any currently running sync operations
     */
    getRunning(): SyncHistoryEntry[];
    /**
     * Check if a sync is currently running
     */
    isRunning(): boolean;
    /**
     * Clean up old history entries
     * @param daysToKeep Number of days of history to retain
     */
    cleanup(daysToKeep?: number): number;
    /**
     * Get total count of history entries
     */
    count(): number;
    /**
     * Get sync statistics
     */
    getStats(): {
        totalRuns: number;
        successfulRuns: number;
        failedRuns: number;
        lastSuccessAt: string | null;
        averageDurationMs: number | null;
    };
}
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