{
	"bsonType": "object",
	"required": ["value", "expired"],
	"permission": {
		"read": false,
		"create": false,
		"update": false,
		"delete": false
	},
	"properties": {
		"_id": {
			"description": "ID，系统自动生成"
		},
		"value": {
			"description": "值"
		},
		"expired": {
			"description": "过期时间",
			"bsonType": "timestamp"
		}
	}
}
