/**
 * Database metadata resource
 * Returns comprehensive database structure including schemas, tables, columns, indexes, and constraints
 */
export interface ColumnInfo {
    name: string;
    type: string;
    nullable: boolean;
    default: string | null;
    characterMaximumLength: number | null;
    numericPrecision: number | null;
    numericScale: number | null;
}
export interface IndexInfo {
    name: string;
    columns: string[];
    unique: boolean;
    primary: boolean;
    type: string;
}
export interface ConstraintInfo {
    name: string;
    type: string;
    columns: string[];
    foreignSchema?: string;
    foreignTable?: string;
    foreignColumns?: string[];
}
export interface TableInfo {
    name: string;
    type: string;
    columns: ColumnInfo[];
    indexes: IndexInfo[];
    constraints: ConstraintInfo[];
}
export interface SchemaInfo {
    name: string;
    tables: TableInfo[];
}
export interface DatabaseMetadata {
    schemas: SchemaInfo[];
}
/**
 * Fetches complete database metadata
 */
export declare function getDatabaseMetadata(): Promise<DatabaseMetadata>;
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