Lost feed logging/visualisation

Hello All,

Extream newbie here, so go easy on me :) 

I set up a RaspberryPi running EmonCMS this evening and for the first hour or so it was running real time visualisations of feeds, and the logs were growing by about 1 kb every 30 minutes. But it looks like I did something wrong and deleted a feed and now, even though I've recreated three working feeds, visualisations of those feeds give empty graphs and the logs don't seem to be growing at all. 

I've tried having a poke around in the emoncms MySQL database, but a forum search revealed that feed logs aren't stored there. So not sure where to go now. 

Any help would be appriciated! 

Thanks!