/**
 * Migration 008: Unique content_hash on embeddings
 *
 * The baseline schema declares content_hash as UNIQUE but older databases
 * may have been created before that constraint was enforced. The pipeline
 * Phase C write path uses ON CONFLICT(content_hash), which requires a
 * unique index. Dedup any collisions then create the index.
 */
import type { MigrationDb } from "./index";
export declare function up(db: MigrationDb): void;
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