Function tokenSignature

src/utils/cacheStats.ts:42–44

(u: CacheUsage)

 * A change in signature means a new API response arrived — reset the TTL clock.
 */
export function tokenSignature(u: CacheUsage): string {
  return `${u.input_tokens}|${u.cache_creation_input_tokens}|${u.cache_read_input_tokens}`
}

// ---------------------------------------------------------------------------
// State file I/O