Function queryCheckpoint

src/utils/queryProfiler.ts:69–84

(name: string)

 * Record a checkpoint with the given name
 */
export function queryCheckpoint(name: string): void {
  if (!ENABLED) return

  const perf = getPerformance()
  perf.mark(name)
  memorySnapshots.set(name, process.memoryUsage())

  // Track first token specially
  if (name === 'query_first_chunk_received' && firstTokenTime === null) {
    const marks = perf.getEntriesByType('mark')
    if (marks.length > 0) {
      const lastMark = marks[marks.length - 1]
      firstTokenTime = lastMark?.startTime ?? 0
    }
  }
}

/**
 * End the current query profiling session