/**
 * Migration 003: Unique content hash index
 *
 * Safely creates a unique partial index on content_hash. Must run as a
 * separate migration because 002 was already shipped with a non-unique
 * index — existing installs need this new version to pick up the change.
 *
 * Also backfills `why` and `project` columns for databases that ran 001
 * before those columns were added to the baseline CREATE TABLE.
 */
import type { MigrationDb } from "./index";
export declare function up(db: MigrationDb): void;
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