====HistoryFill====

The **histhelper** library and its **HistoryFill** class are designed to make it easy to get ARDI drivers to behave in the expected fashion.

Instead of writing directly to the **query**, you instead write all of the data you extract from the data source to an instance of the //HistoryFill//. 

This will then handle edge-filling, upscaling, downscaling and trimming as appropriate to ensure your data works the way that ARDI requires.

===Basic Workflow===

A driver will usually follow the following steps when using **HistoryFill**.

   * Split your properties into **discrete** and **analogue** values using [[SplitAddress|SpitAddresses]]
   * (Optional) Load the pre-query values with [[SetInitialValue]],
   * Write individual historical values with [[RecordDiscrete]] and [[RecordAnalogue]].
   * (Optional) Refine the data with [[Autosample]], [[Upsample]] or [[Downsample]], if the data source doesn't do it natively,
   * (Optional) Call [[MissingItems]] and [[Backfill]] on any points without data,
   * Call [[histhelper_finish|Finish]] to write the values to ARDI.