/**
 * PostgreSQL database connection module
 * Provides connection pooling and health check functionality
 */
import pg from 'pg';
/**
 * Database configuration from environment variables
 */
export interface DatabaseConfig {
    uri: string;
    user: string;
    password: string;
    maxConnections?: number;
    idleTimeoutMs?: number;
    connectionTimeoutMs?: number;
}
/**
 * Get database configuration from environment variables
 */
export declare function getDatabaseConfig(): DatabaseConfig;
/**
 * Initialize the database connection pool
 * @param config - Optional database configuration (defaults to environment variables)
 */
export declare function initializePool(config?: DatabaseConfig): pg.Pool;
/**
 * Get the database connection pool
 * Initializes the pool if not already done
 */
export declare function getPool(): pg.Pool;
/**
 * Check if the database connection is healthy
 * @returns true if the database is reachable, false otherwise
 */
export declare function checkDatabaseHealth(): Promise<boolean>;
/**
 * Close the database connection pool
 * Should be called when shutting down the server
 */
export declare function closePool(): Promise<void>;
/**
 * Execute a query with automatic connection management
 * @param text - SQL query text
 * @param params - Query parameters
 */
export declare function query<T extends pg.QueryResultRow = any>(text: string, params?: any[]): Promise<pg.QueryResult<T>>;
/**
 * Run database migrations
 * Creates necessary tables if they don't exist
 */
export declare function runMigrations(): Promise<void>;