import type Database from "better-sqlite3";
export type CacheMetadataKey = "last_conversation_id" | "last_conversation_created_at" | "projects_last_indexed_at" | "conversations_last_indexed_at" | "conversations_dirty";
export declare class CacheMetadataRepository {
    private get;
    private upsert;
    private del;
    constructor(db: Database.Database);
    getCacheMetadata(key: CacheMetadataKey): string | null;
    setCacheMetadata(key: CacheMetadataKey, value: string): void;
    deleteCacheMetadata(key: CacheMetadataKey): void;
}
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