CLN: Remove earliest_time, which does not need its own method.
CLN: Remove earliest_time, which does not need its own method.

ericdill/databroker,NSLS-II/datamuxer,danielballan/datamuxer,danielballan/dataportal,tacaswell/dataportal,danielballan/datamuxer,NSLS-II/dataportal,ericdill/datamuxer,tacaswell/dataportal,ericdill/databroker,NSLS-II/dataportal,ericdill/datamuxer,danielballan/dataportal