/**
 * PostgreSQL Introspection Tools - Shared Helpers
 *
 * Common types, utility functions, and shared database queries
 * used by graph analysis and schema analysis tools.
 */
import type { PostgresAdapter } from "../../postgres-adapter.js";
export interface FkEdge {
    constraintName: string;
    fromSchema: string;
    fromTable: string;
    fromColumns: string[];
    toSchema: string;
    toTable: string;
    toColumns: string[];
    onDelete: string;
    onUpdate: string;
}
export interface TableNode {
    schema: string;
    table: string;
    rowCount?: number;
    sizeBytes?: number;
}
/**
 * Fetch all foreign key relationships across user schemas
 */
export declare function fetchForeignKeys(adapter: PostgresAdapter, schemaFilter?: string, excludeExtensionSchemas?: boolean): Promise<FkEdge[]>;
/**
 * Fetch all user tables with row counts and sizes
 */
export declare function fetchTableNodes(adapter: PostgresAdapter, schemaFilter?: string, excludeExtensionSchemas?: boolean): Promise<TableNode[]>;
/**
 * Parse PostgreSQL array column (handles both native arrays and string format)
 */
export declare function parseArrayColumn(value: unknown): string[];
/**
 * Create qualified table name
 */
export declare function qualifiedName(schema: string, table: string): string;
/**
 * Check if a schema exists in the database.
 * Returns null if schema exists or no filter specified, or error response if nonexistent.
 */
export declare function checkSchemaExists(adapter: PostgresAdapter, schemaFilter?: string): Promise<void>;
/**
 * Check if a table exists in the database.
 * Returns null if table exists or no filter specified, or error response if nonexistent.
 */
export declare function checkTableExists(adapter: PostgresAdapter, tableFilter?: string, schemaFilter?: string): Promise<void>;
//# sourceMappingURL=helpers.d.ts.map