import type { MigrationDb } from "./index";
/**
 * Add nullable `scope` column to memories table.
 *
 * Normal memories keep `scope = NULL`. Benchmark or namespaced memories
 * get a scoped value (e.g. "memorybench:question_42_run1"). A partial
 * index on non-NULL scopes keeps the overhead at zero for normal queries.
 */
export declare function up(db: MigrationDb): void;
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