import type { Document } from 'payload';
import type { ClickHouseAdapter, UpsertManyArgs } from '../types.js';
/**
 * Bulk upsert operation - insert multiple documents in a single batch
 *
 * Uses ClickHouse's native batch insert for optimal performance.
 * Documents with an existing `id` will create a new version (ReplacingMergeTree handles dedup).
 * Documents without an `id` will have one generated.
 *
 * @example
 * ```ts
 * const docs = await payload.db.upsertMany({
 *   collection: 'posts',
 *   docs: [
 *     { data: { title: 'Post 1', slug: 'post-1' } },
 *     { data: { id: 'existing-id', title: 'Updated Post' } },
 *   ]
 * })
 * ```
 */
export declare function upsertMany(this: ClickHouseAdapter, args: UpsertManyArgs): Promise<Document[]>;
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