Is your feature request related to a problem? Please describe.

random strings are populated in YCSB fields[0-9]. having context to when the field was updated can be helpful for demos. For example, backup, restore and CDC showing the context of what was changed is useful.

Describe the solution you'd like
prepend time in UTC format that matches CRDB's time printing format.

Describe alternatives you've considered
N/A

Additional context
N/A