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You can show last few set of dataPoints with the help of shift method. Please take a look at this documentation page for step to step tutorial on creating Dynamic Charts.
I would suggest you to store CSV in date-time,value format. Please take a look at this updated JSFiddle for an example with Jun 10 2019 00:00:03 EST,422 format.
Jun 10 2019 00:00:03 EST,422