UNDP Chart (Historical Data)

I have a UNDP chart for our PDUs that shows the Active Power for the PDUs over time. 

Last night there was an erroneous snmp data poll that blew the table way out of range and now I cannot even see the chart lines because it went from a normal range of 0-2k to a ridiculous 0-600k

Is there a way to reset this historical data or change the Y axis of the table so I can see the chart lines again?

You can see the spike in this screenshot and how now all the values are dwarfed by this huge range. Thereby not appearing in the chart at all.