import type Database from 'better-sqlite3';
import type { ValidationResult } from '../models/entity';
/**
 * Validate the entire graph for integrity violations.
 * Read-only: does not modify any data.
 *
 * Checks:
 * 1. Dangling relations (from_id or to_id references non-existent document)
 * 2. Type constraint violations (doc type not in relation type's from_types/to_types)
 * 3. Cardinality violations (one_to_one/one_to_many/many_to_one exceeded)
 */
export declare function validateGraph(db: Database.Database): ValidationResult;
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