/**
 * Database connection utilities for read-only Postgres access
 */
import pg from 'pg';
/**
 * Creates and returns a read-only Postgres connection pool
 * @throws {Error} If DATABASE_URL is not set or connection fails
 */
export declare function getReadOnlyPool(): pg.Pool;
/**
 * Tests the database connection
 * @throws {Error} If connection test fails
 */
export declare function testConnection(): Promise<void>;
/**
 * Gracefully closes the database connection pool
 */
export declare function closePool(): Promise<void>;
/**
 * Validates that a schema and table name are safe to use in queries
 * This helps prevent SQL injection even though we use parameterized queries
 */
export declare function validateIdentifier(identifier: string): boolean;
/**
 * Helper to execute a query with error handling
 */
export declare function executeQuery<T extends pg.QueryResultRow = any>(query: string, params?: any[]): Promise<pg.QueryResult<T>>;
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