export interface CacheEntry {
    key: string;
    value: string;
    compressedSize: number;
    originalSize: number;
    hitCount: number;
    createdAt: number;
    lastAccessedAt: number;
}
export interface CacheStats {
    totalEntries: number;
    totalHits: number;
    totalMisses: number;
    hitRate: number;
    totalCompressedSize: number;
    totalOriginalSize: number;
    compressionRatio: number;
}
export declare class CacheEngine {
    private db;
    private memoryCache;
    private dbPath;
    private stats;
    constructor(dbPath?: string, maxMemoryItems?: number);
    /**
     * Get a value from cache
     */
    get(key: string): string | null;
    /**
     * Get a value from cache with metadata (including compression info)
     */
    getWithMetadata(key: string): {
        content: string;
        compressedSize: number;
    } | null;
    /**
     * Set a value in cache
     */
    set(key: string, value: string, originalSize: number, compressedSize: number): void;
    /**
     * Delete a value from cache
     */
    delete(key: string): boolean;
    /**
     * Clear all cache
     */
    clear(): void;
    /**
     * Get cache statistics
     */
    getStats(): CacheStats;
    /**
     * Evict least recently used entries to stay under size limit
     */
    evictLRU(maxSizeBytes: number): number;
    /**
     * Get all cache entries (for debugging/monitoring)
     */
    getAllEntries(): CacheEntry[];
    /**
     * Update hit count and last accessed time
     */
    private updateHitCount;
    /**
     * Get the database path currently in use
     */
    getDatabasePath(): string;
    /**
     * Close database connection
     */
    close(): void;
}
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