Possible to remove spurious data points?

[JasonEde]

I've had a couple of glitches on my temperature sensor, one where it's shot up to 35C for a single point. I wonder if it is possible to edit the database to remove the point? I've tried using rrdtool, but it says the file format isn't compatible. Is there another way to edit this?

Also I've had to remove the java memory lines from application.ini to stop it using all the memory on a version 1 pi.