What is eventlog.tsv in the Nucleus Folder?

Hi,

I was doing a backup and I came across Nucleus’ eventlog.tsv file. It is 150GB and I’m wondering what it does and if it’s necessary for it to be backed up.

Additionally, since this takes up so much space - and depending on its function - is there any way to reset it or decrease the size?

I appreciate the info, thank you!

-Matthew