// 文档教程: https://uniapp.dcloud.net.cn/uniCloud/schema
{
  "bsonType": "object",
  "required": ["_id", "value"],
  "properties": {
    "_id": {
      "bsonType": "string",
      "description": "key，格式：uni-id:[provider]:[appid]:[openid]:[access-token|user-access-token|session-key|encrypt-key-version|ticket]"
    },
    "value": {
      "bsonType": "object",
      "description": "字段_id对应的值"
    },
    "expired": {
      "bsonType": "date",
      "description": "过期时间"
    }
  }
}