/**
 * QuestDB exporter — pulls data via signalk-questdb's HTTP route.
 *
 * The signalk-questdb plugin exposes:
 *   GET /plugins/signalk-questdb/api/full-export/tables → { tables: [...] }
 *   GET /plugins/signalk-questdb/api/full-export/<table>?from=&to= → parquet stream
 *
 * Both are served by SignalK in-process, so we reach them via plain HTTP
 * over loopback. No container exec, no shared filesystem ownership issues.
 *
 * For each table we partition the export by ISO week into one parquet
 * file per week. Closed weeks become byte-identical across export cycles
 * and dedup perfectly in kopia. The current ("open") week plus a small
 * rolling churn window get re-exported each cycle to absorb late arrivals.
 *
 * Streams the response body directly to a temp file in the shard's
 * directory, then atomically renames into place — so a snapshot
 * mid-export never sees a half-written parquet.
 */
import type { DatabaseExporter, ExportResult } from './types.js';
export interface QuestDBExporterOptions {
    signalkBaseUrl?: string;
    log?: (msg: string) => void;
    /** Override fetch (tests). */
    fetch?: typeof fetch;
    /** Override "now" (tests). */
    now?: () => Date;
}
export declare class QuestDBExporter implements DatabaseExporter {
    readonly pluginId = "signalk-questdb";
    private readonly baseUrl;
    private readonly fetchImpl;
    private readonly nowImpl;
    constructor(opts?: QuestDBExporterOptions);
    private readonly log;
    detect(): Promise<boolean>;
    exportAll(stagingDir: string): Promise<ExportResult>;
    private listTables;
    private exportTable;
    /**
     * If the staging dir has a `<table>.parquet` directly (pre-partitioning
     * layout), move it aside to `<table>.parquet.legacy`. Idempotent.
     */
    private migrateLegacyFlatFile;
    /**
     * Earliest week recorded in a manifest, or null if no shards exist.
     * Pure helper, no I/O — manifest is already read by the caller.
     */
    private earliestWeekFromManifest;
    private churnCutoffWeek;
    private exportWeekToShard;
}
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