[
  {"source":"batch-worker","event_id":"job-1001","unit":"compute_minute","quantity":"12.500","occurred_at":"2026-01-18T09:30:00Z"},
  {"source":"batch-worker","event_id":"job-1002","unit":"compute_minute","quantity":"7.250","occurred_at":"2026-01-18T10:00:00Z"},
  {"source":"gateway","event_id":"batch-01","unit":"api_call","quantity":"1250","occurred_at":"2026-01-18T10:30:00Z"}
]