/**
 * Ask the server for the timestamp of the most recent Claude Code log it already holds, so
 * `capture-sessions` only re-scans files newer than that. This is a server-authoritative cutoff that
 * survives local state-file loss or a reinstall.
 *
 * Queries the `/api/v2/llm_request_logs` index for the single newest `claude_code` row. The server
 * has no default sort, so newest-first is requested explicitly via `q[s]`. Index reads require the
 * client's PRIVATE key (`private_key`, or the `COOLHAND_PRIVATE_KEY` env var); the public ingest
 * key is write-only and the server answers it with a 401.
 *
 * It NEVER throws: any problem (no private key, bad base url, 401, network failure, non-JSON body,
 * an empty result set, or an invalid `created_at`) returns `null` so the caller can fall back to
 * local state.
 *
 * `opts.clientId` is expected to be an **already-resolved** `client_id` string (e.g. from
 * `resolveClient`), not a raw user input. `getClient` is used here deliberately: by the time this
 * is called the client has already been selected (or is undefined for dry-run), so re-running the
 * full resolution chain would be redundant and could trigger a second TTY prompt.
 */
export declare function fetchLastSync(opts?: {
    clientId?: string;
}): Promise<Date | null>;
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