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→How is the functionality used?
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When Cumulus is restarted, if the weather station provides historical catch-up data, then the interval between entries for that period when Cumulus was not running, is stored at whatever interval the historical catch-up data uses. Entries less than a week old, from when MX was previously running will be retained, and those will be at one minute interval. | When Cumulus is restarted, if the weather station provides historical catch-up data, then the interval between entries for that period when Cumulus was not running, is stored at whatever interval the historical catch-up data uses. Entries less than a week old, from when MX was previously running will be retained, and those will be at one minute interval. | ||
=How is the functionality used | = How is the functionality used = | ||
By a request to Cumulus specifying 1 to 10 079 minutes ago. Then Cumulus will retrieve the value for the nearest available time. | By a request to Cumulus specifying 1 to 10 079 minutes (equals 7 days) ago. Then Cumulus will retrieve the value for the nearest available time. | ||
The normal way to retrieve a specific value is by using | The normal way to retrieve a specific value is by using Recent History Webtag names and specifying how many minutes ago you want through the parameters. | ||
You'll get the nearest value if you ask for a time for which there is currently no exact match, and the first tag [[Webtags#Recent_History|listed here]] tells you that nearest time. | You'll get the nearest value if you ask for a time for which there is currently no exact match, and the first tag [[Webtags#Recent_History|listed here]] tells you that nearest time. | ||
There are a number of internal calculations, such as calculating [[Average temperature]], [[Heat/cold degree days and Chill hours]], which use the recent history data | There are a number of internal calculations, such as calculating [[Average temperature]], [[Heat/cold degree days and Chill hours]], which use the recent history data stored in the Recent History Database for CumulusMX. These data are also used for the standard [[MX_Administrative_Interface#Charts|charts]] and the JSON data for the charts on the standard website and many other websites. See: [[:Category:JSON_Files#Uploading_data_to_a_web_server_outside_MX:|Uploading data to a webserver outside CumulusMX ]] . | ||
=How does Cumulus update the data?= | =How does Cumulus update the data?= | ||