/**
 * Subgraph Client
 *
 * Handles GraphQL queries to The Graph subgraph for searching, exporting,
 * and counting on-chain facts. Query strings are sourced from the Rust WASM
 * core where possible to ensure consistency across implementations.
 */
export interface SubgraphFact {
    id: string;
    encryptedBlob: string;
    encryptedEmbedding: string | null;
    decayScore: string;
    isActive: boolean;
    contentFp?: string;
    sequenceId?: string;
    blockNumber?: string;
    timestamp?: string;
    version?: number;
}
export declare class SubgraphClient {
    private endpoint;
    constructor(endpoint: string);
    search(owner: string, trapdoors: string[]): Promise<SubgraphFact[]>;
    /**
     * Broadened search: fetch recent active facts by owner without trapdoor filtering.
     * Used as a fallback when trapdoor search returns 0 candidates.
     */
    searchBroadened(owner: string, maxCandidates?: number): Promise<SubgraphFact[]>;
    fetchAllFacts(owner: string): Promise<SubgraphFact[]>;
    deltaSyncFacts(owner: string, sinceBlock: number): Promise<SubgraphFact[]>;
    getFactCount(owner: string): Promise<number>;
    private query;
}
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