/**
 * Per-account token and cost totals, read incrementally from the proxy's own
 * request log.
 *
 * `~/.neurolink/logs` runs to hundreds of megabytes, so a polled endpoint
 * cannot re-read it per request. This keeps a per-file cursor and only ever
 * reads bytes appended since the last call.
 *
 * ## Why this is not built on proxyAnalysis.ts
 *
 * That module always re-reads whole files and sweeps the lifecycle, attempts
 * and debug streams too. Attempts carry one row per retry for the same
 * requestId, so folding them in would multiply a retried request's tokens by
 * its retry count.
 *
 * ## Correctness rules this file exists to enforce
 *
 * - **Only `proxy-<date>.jsonl`.** Never attempts/lifecycle/debug.
 * - **Dedupe by requestId.** A request can be logged twice: once when the
 *   response headers are known and again when a streamed body finishes and its
 *   token counts arrive (the Codex engine does exactly this). Totals are
 *   derived from a requestId-keyed map, never by adding up raw lines.
 * - **Only advance the cursor to the last complete newline**, so a line still
 *   being appended is re-read whole next time rather than parsed truncated.
 * - **A shrinking file means delete-and-recreate**, not truncation — the writer
 *   only appends. Reset the cursor rather than reporting corruption.
 */
import type { CliAccountUsageTotals } from "../types/index.js";
/** UTC date stamp of the log file the totals cover. */
export declare function currentUsageDate(now?: Date): string;
/**
 * Token and cost totals for one UTC day, keyed by provider-qualified account
 * key ("anthropic:<label>" / "codex:<label>").
 *
 * Both engines' rows are attributed, each under its own key, so a Codex login
 * sharing an email with an Anthropic one contributes to its own row and never
 * to the other's. Keying by bare label used to force a choice between merging
 * them and dropping Codex outright; it dropped Codex.
 */
export declare function readAccountUsage(date?: string): Promise<Map<string, CliAccountUsageTotals>>;
/** Drop all cached cursors. Exported for tests, which vary HOME per case. */
export declare function resetAccountLedgerCache(): void;