/**
 * Database Connection Manager for Design Tables
 * Supports SQL Server and PostgreSQL
 */
export interface DBConnection {
    query(sql: string, params?: any[]): Promise<any[]>;
    close(): Promise<void>;
}
export declare class PostgreSQLConnection implements DBConnection {
    private client;
    constructor(connectionString: string);
    connect(): Promise<void>;
    query(sql: string, params?: any[]): Promise<any[]>;
    close(): Promise<void>;
}
export declare class SQLServerConnection implements DBConnection {
    private pool;
    private config;
    constructor(connectionString: string);
    connect(): Promise<void>;
    query(sql: string, params?: any[]): Promise<any[]>;
    close(): Promise<void>;
}
export declare class DatabaseManager {
    private connections;
    /**
     * Create a database connection
     */
    createConnection(name: string, connectionString: string): Promise<DBConnection>;
    /**
     * Get an existing connection
     */
    getConnection(name: string): DBConnection | undefined;
    /**
     * Close a connection
     */
    closeConnection(name: string): Promise<void>;
    /**
     * Close all connections
     */
    closeAll(): Promise<void>;
    /**
     * Execute a query on a named connection
     */
    query(connectionName: string, sql: string, params?: any[]): Promise<any[]>;
}
export declare const dbManager: DatabaseManager;
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