Returns the most recent update or updates going back in time from now for a specified Unit.
The return will be in the format of a list of lists, each internal list will have 2 values, the date of the event and the value of the event.
Get the 3 most recent motion hits from the front porch:
tell app “XTdb” to set myHitList to most recent 3 for “front porch motion"
Get the 10 most recent temperature readings from the server room sensor:
tell app “XTdb” to set myTempList to most recent 10 for “server temperature"