/**
 * Namespace registry — one LogosDB instance per namespace, all rooted at LOGOSDB_PATH.
 *
 * Native `logosdb` is loaded lazily so the MCP process can complete initialize + tools/list
 * even when prebuilds are missing (clear error on first tool call instead of "0 tools").
 */
export interface SearchHit {
    id: number;
    score: number;
    text: string | null;
    timestamp: string | null;
}
interface LogosDB {
    put(embedding: number[], text?: string, timestamp?: string): number;
    putBatch(embeddings: number[], n: number, texts?: (string | null | undefined)[], timestamps?: (string | null | undefined)[]): number[];
    search(queryEmbedding: number[], topK?: number): SearchHit[];
    searchTsRange(queryEmbedding: number[], options?: {
        topK?: number;
        tsFrom?: string;
        tsTo?: string;
        candidateK?: number;
    }): SearchHit[];
    delete(id: number): void;
    count(): number;
    countLive(): number;
    dim(): number;
    close(): void;
}
export declare class NamespaceStore {
    private readonly root;
    private readonly dbs;
    constructor(root: string);
    private nsPath;
    open(namespace: string, dim: number): LogosDB;
    get(namespace: string): LogosDB;
    list(): string[];
    /**
     * Return live vector count and dim for every currently-open namespace.
     * Namespaces that have never been opened return no entry — callers can
     * present them as "not yet accessed" without forcing a DB open.
     */
    openStatsSnapshot(): Record<string, {
        countLive: number;
        dim: number;
    }>;
    closeAll(): void;
}
export {};
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