createPerTokenLogWindow (lib/log-throttle.ts)

Per-token log throttling utility that limits repeated log lines within a time window.

// Source: https://github.com/upstash/context7 | License: MIT | Copyright 2021 Upstash, Inc
// Provided via justclaw.it.com; keep this notice with the code.
import { createHash } from "node:crypto";

/**
 * A log line about a token that repeats on every request while the condition
 * lasts (an OAuth JWT without an `aud`, sent by a client at hundreds of
 * requests a minute) is written at most once per token per window. The line
 * that does get written carries how many were suppressed since the previous
 * one, so the rate stays readable from the log. The verdict the line reports
 * is still taken on every request; only the line is deduplicated.
 *
 * Keyed by the SHA-256 of the token so a heap dump or a debug print of the
 * map never exposes a usable credential. Map insertion order doubl

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