Datapoints "date" must be daily?
No, you can provide any type of date (e.g. every seconds), the important thing is that the history data must have a "date" field for every datapoints in YYYY-MM-DD or ISO8601 date, we support also non constant dates such as datapoints that are not always taken in the same time window (e.g. first N data every 5 minutes, then every 3 minutes etc.), but we suggest constant dates to have better results.