import type { MigrationDb } from "./index";
/**
 * Make the content_hash unique index scope-aware.
 *
 * The original idx_memories_content_hash_unique prevents duplicate content
 * regardless of scope. With scoped memories (benchmarks, namespaced data),
 * the same content legitimately exists in multiple scopes. Replace the
 * global unique index with one that uses COALESCE(scope, '__NULL__') so
 * duplicates are only blocked within the same scope.
 */
export declare function up(db: MigrationDb): void;
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