import type Database from 'better-sqlite3';
import type { Relation, RelationType, RelationQueryOptions } from './entity';
/**
 * Get a relation type definition by name.
 */
export declare function getRelationType(db: Database.Database, name: string): RelationType | undefined;
/**
 * Create a relation with full constraint enforcement (AD-0017).
 * All checks run in a single transaction; inverse auto-created if defined.
 *
 * Validation order per AD-0017:
 * 1. Self-relation check
 * 2. Entity existence
 * 3. Relation type existence
 * 4. Type constraint
 * 5. Cardinality constraint
 * 6. Duplicate check
 * 7. Insert primary
 * 8. Insert inverse
 */
export declare function createRelation(db: Database.Database, fromId: string, relType: string, toId: string, properties?: Record<string, unknown>): Relation;
/**
 * Remove a relation by ID.
 * Also removes any inverse relation.
 */
export declare function removeRelation(db: Database.Database, relationId: number): void;
/**
 * Query relations for an entity.
 */
export declare function queryRelations(db: Database.Database, options: RelationQueryOptions): Relation[];
/**
 * Get all relation types.
 */
export declare function listRelationTypes(db: Database.Database): RelationType[];
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