Raspbian For Robots PiOS Oct 17, 2020 Beta: MySQL mysqld?

Noticed

  PID  PPID %MEM %CPU CMD
  662     1  5.5  0.1 /usr/sbin/mysqld

I don’t recall seeing the MySQL daemon running on the Stretch version of R4R.

Is this a PiOS or R4R process?
Is it part of the Apache server?
Does R4R use MySQL for something?