import type { DatabaseSync } from "node:sqlite";
/**
 * Projection integrity 与 partial rebuild gate。
 */
export type ProjectionStatus = "ready" | "partial" | "degraded";
export interface ProjectionCheck {
    ok: boolean;
    status: ProjectionStatus;
    reason?: string;
    chunkCount: number;
    ftsCount: number;
}
/**
 * 读取 projection_status。
 */
export declare function getProjectionStatus(db: DatabaseSync): ProjectionStatus;
/**
 * 设置 projection_status；partial/degraded 时强制关闭 auto_recall。
 */
export declare function setProjectionStatus(db: DatabaseSync, status: ProjectionStatus): void;
/**
 * partial rebuild 开始：标记 partial 并关闭 auto。
 */
export declare function markPartialRebuild(db: DatabaseSync): void;
/**
 * rebuild 成功：恢复 ready。
 */
export declare function clearPartialRebuild(db: DatabaseSync): void;
/**
 * 版本一致 + FTS/canonical 计数对齐 + 可查询。
 */
export declare function checkProjectionIntegrity(db: DatabaseSync): ProjectionCheck;
/**
 * 若 integrity 失败则标记 degraded 并返回 false。
 */
export declare function ensureProjectionReady(db: DatabaseSync): boolean;
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