import type { MigrationDb } from "./index";
/**
 * Add unique constraint on entity_dependencies to prevent duplicate rows.
 *
 * The inline entity linker and graph transactions both insert with
 * ON CONFLICT DO NOTHING, but no unique index existed — so duplicates
 * accumulated freely. This migration adds the missing constraint and
 * removes existing duplicates (keeping the oldest row per group).
 */
export declare function up(db: MigrationDb): void;
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