import type { DatabaseSync } from "node:sqlite";
/**
 * 检索：SQL candidate 阶段绑定 project scope，再 rank/dedupe/budget。
 */
export type SearchScope = "project" | "all";
export interface SearchOptions {
    scope: SearchScope;
    projectKey?: string;
    limit?: number;
    maxLimit?: number;
    /** 排除当前 session（自动召回） */
    excludeSessionId?: string;
    /** 仅 autoEligible=true */
    autoEligibleOnly?: boolean;
    /** 仅 provenance=verified */
    verifiedOnly?: boolean;
    /** no-hit：词项覆盖低于该阈值的候选丢弃 */
    minTermCoverage?: number;
}
export interface SearchHit {
    sessionId: string;
    entryId: string;
    role: string;
    occurredAt: string;
    snippet: string;
    truncated: boolean;
    sourceKey: string;
    contentHash: string;
    originProjectKey: string;
    score: number;
}
export interface SearchResult {
    ok: true;
    query: string;
    hits: SearchHit[];
}
/**
 * 执行搜索。
 */
export declare function searchChunks(db: DatabaseSync, rawQuery: string, options: SearchOptions): SearchResult;
/**
 * 词项覆盖率。
 */
export declare function computeTermCoverage(text: string, terms: string[]): number;
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