/**
 * Caching service with TTL support
 */
import NodeCache from 'node-cache';
/**
 * Cache TTL values in seconds
 */
export declare const CacheTTL: {
    readonly QUOTE: number;
    readonly HISTORICAL: number;
    readonly NEWS: number;
    readonly SEARCH: number;
    readonly INDICATOR: number;
    readonly MARKET_SUMMARY: 60;
    readonly INSIDER_TRADES: 3600;
    readonly INSTITUTIONAL_HOLDINGS: 86400;
    readonly OWNERSHIP_CHANGES: 3600;
    readonly MATERIAL_EVENTS: 1800;
    readonly FINANCIALS: 86400;
    readonly DCF: 3600;
    readonly CIK_MAPPING: 604800;
    readonly COMPANY_TICKERS: 86400;
    readonly DEFAULT: number;
};
/**
 * Cache key prefixes for different data types
 */
export declare const CachePrefix: {
    readonly QUOTE: "quote";
    readonly HISTORICAL: "historical";
    readonly NEWS: "news";
    readonly SEARCH: "search";
    readonly INDICATOR: "indicator";
    readonly MARKET: "market";
    readonly WATCHLIST: "watchlist";
    readonly INSIDER_TRADES: "insider_trades";
    readonly INSTITUTIONAL: "institutional_holdings";
    readonly OWNERSHIP: "ownership_changes";
    readonly MATERIAL_EVENTS: "material_events";
    readonly FINANCIALS: "financials";
    readonly DCF: "dcf_valuation";
    readonly CIK_MAP: "cik_map";
    readonly COMPANY_TICKERS: "sec_company_tickers";
};
export declare class CacheService {
    private cache;
    private static instance;
    private constructor();
    /**
     * Get singleton instance
     */
    static getInstance(): CacheService;
    /**
     * Get a value from cache
     */
    get<T>(key: string): Promise<T | undefined>;
    /**
     * Set a value in cache with optional TTL
     */
    set<T>(key: string, value: T, ttl?: number): Promise<void>;
    /**
     * Delete a value from cache
     */
    del(key: string): Promise<void>;
    /**
     * Delete all keys matching a pattern
     */
    delPattern(pattern: string): Promise<void>;
    /**
     * Check if a key exists in cache
     */
    has(key: string): Promise<boolean>;
    /**
     * Flush all cache entries
     */
    flush(): void;
    /**
     * Get cache statistics
     */
    getStats(): NodeCache.Stats;
    /**
     * Get or set pattern: get from cache, or compute and cache
     */
    getOrSet<T>(key: string, factory: () => Promise<T>, ttl?: number): Promise<T>;
    /**
     * Generate cache key for quote
     */
    static generateQuoteKey(symbol: string): string;
    /**
     * Generate cache key for historical data
     */
    static generateHistoricalKey(symbol: string, period1: string | Date, period2: string | Date | undefined, interval: string): string;
    /**
     * Generate cache key for news
     */
    static generateNewsKey(symbol?: string): string;
    /**
     * Generate cache key for search
     */
    static generateSearchKey(query: string): string;
    /**
     * Generate cache key for indicator
     */
    static generateIndicatorKey(symbol: string, indicator: string, period: number, interval: string): string;
    /**
     * Generate cache key for market summary
     */
    static generateMarketKey(type: 'summary' | 'trending'): string;
    /**
     * Generate cache key for watchlist
     */
    static generateWatchlistKey(name?: string): string;
    /**
     * Adjust TTL based on market hours
     * During market hours (9:30 AM - 4:00 PM ET), use shorter TTL
     * After hours, use longer TTL
     */
    static getAdjustedTTL(baseTTL: number): number;
}
export declare const cacheService: CacheService;
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