#$newly

{
  "query": {
    "日期": {
      "$gte": "2025-01-01 00:00:00",
      "$lte": "2025-01-31 23:59:59"
    }
  },
  "preds": [
    {
      "name": "新增用户数",
      "operator": "$newly",
      "pred": { "operator": "$count", "pred": "用户" }
    }
  ]
}