/**
 * SMI-585: L2 SQLite Persistent Cache
 * Persistent cache layer with configurable TTL
 */
import type { SearchResult, SearchCacheEntry, CacheStats } from './lru.js';
export interface L2CacheOptions {
    dbPath: string;
    ttlSeconds?: number;
}
interface L2CacheInternalOptions {
    ttlSeconds?: number;
}
export declare class L2Cache {
    private db;
    private readonly ttlSeconds;
    private hits;
    private misses;
    private stmts;
    /**
     * @deprecated Use L2Cache.create(options) — async factory with WASM fallback.
     * The dbPath passed to this constructor throws to prevent silent data loss.
     */
    constructor(options: L2CacheOptions | L2CacheInternalOptions);
    /**
     * Async factory — supports both native and WASM SQLite.
     *
     * @param options - Cache options including dbPath
     * @returns Fully initialised L2Cache instance
     */
    static create(options: L2CacheOptions): Promise<L2Cache>;
    private initTable;
    private prepareStatements;
    /**
     * Get cached search results
     */
    get(key: string): SearchCacheEntry | undefined;
    /**
     * Store search results in cache
     */
    set(key: string, results: SearchResult[], totalCount: number): void;
    /**
     * Check if key exists and is not expired
     */
    has(key: string): boolean;
    /**
     * Delete specific cache entry
     */
    delete(key: string): boolean;
    /**
     * Clear all cache entries
     */
    clear(): void;
    /**
     * Invalidate all entries (called when index updates)
     */
    invalidateAll(): void;
    /**
     * Remove expired entries
     */
    prune(): number;
    /**
     * Get cache statistics
     */
    getStats(): CacheStats & {
        expiredCount: number;
    };
    /**
     * Close database connection
     */
    close(): void;
}
export default L2Cache;
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