[
  {
    "createIndexes": "usage_monthly_counters",
    "indexes": [
      {
        "key": { "uid": 1, "month_key": 1 },
        "name": "usage_counter_uid_month",
        "unique": true
      }
    ]
  },
  {
    "createIndexes": "usage_events",
    "indexes": [
      {
        "key": { "uid": 1, "month_key": 1, "key_mode": 1, "created_at": -1 },
        "name": "usage_events_member_month_mode"
      },
      {
        "key": { "month_key": 1, "created_at": -1 },
        "name": "usage_events_month"
      }
    ]
  }
]