/**
 * Lemma API v2 — BrainStore contract (Lane 0)
 *
 * The durable backing for the /v2 memory routes. Multi-tenant: every method is
 * scoped by `tenantId` and every query MUST filter by it. A store that leaks one
 * tenant's memories to another is a security failure, not a bug (Lane B tests it).
 *
 * Implementations: PostgresBrainStore (cloud, Lane B), FileBrainStore (wraps the
 * local NDJSON brain, Lane B).
 */
export interface Candidate {
    id: string;
    score: number;
}
export interface BrainStore {
    /** Persist a memory under `tenantId`; returns its id. */
    put(tenantId: string, memory: unknown): Promise<string>;
    /** Fetch one memory by id, scoped to the tenant. Resolves null if not owned. */
    get(tenantId: string, id: string): Promise<unknown | null>;
    /**
     * Ranked candidates by BM25-style relevance for a query, scoped to the tenant.
     * Must stay under the contractual p95 budget for the lane's backing impl.
     */
    searchCandidates(tenantId: string, query: string, limit: number): Promise<Candidate[]>;
    /** Fetch many memories by id in one round trip; results scoped to the tenant. */
    listByIds(tenantId: string, ids: string[]): Promise<Map<string, unknown>>;
    /** Hard delete (forget), scoped to the tenant. */
    delete(tenantId: string, id: string): Promise<boolean>;
}
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