/**
 * Cache Database Module
 *
 * Saved queries and results caching functionality.
 */
/**
 * Initialize the saved queries table.
 * Called automatically when needed.
 */
export declare function initSavedQueriesTable(): void;
/**
 * Save a query result to the cache.
 *
 * @param name - Unique name for the saved query
 * @param queryType - Type of query (e.g., 'search', 'coverage', 'gaps')
 * @param queryParams - Parameters used for the query
 * @param result - The result to cache
 * @param ttlMinutes - Optional time-to-live in minutes
 * @returns The generated ID for the saved query
 */
export declare function saveQueryResult(name: string, queryType: string, queryParams: Record<string, unknown>, result: unknown, ttlMinutes?: number): string;
/**
 * Get a saved query result by name.
 * Returns null if not found or expired.
 *
 * @param name - Name of the saved query
 * @returns The cached result or null
 */
export declare function getSavedQuery(name: string): unknown | null;
/**
 * List all saved queries, optionally filtered by type.
 *
 * @param queryType - Optional filter by query type
 * @returns Array of saved query metadata
 */
export declare function listSavedQueries(queryType?: string): Array<{
    id: string;
    name: string;
    query_type: string;
    created_at: string;
}>;
/**
 * Delete a saved query by name.
 *
 * @param name - Name of the saved query to delete
 * @returns True if a query was deleted, false otherwise
 */
export declare function deleteSavedQuery(name: string): boolean;
/**
 * Delete all expired saved queries.
 *
 * @returns Number of queries deleted
 */
export declare function cleanupExpiredQueries(): number;
/**
 * Get a saved query result by ID.
 *
 * @param id - ID of the saved query
 * @returns The cached result or null
 */
export declare function getSavedQueryById(id: string): unknown | null;