the log messages have nothing to do with the EEM applet that you have provided. Most probably there is another script running to add these entries, maybe kron.
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I would say these log entries are coming from an external SNMP monitoring tool, I see 'Solarwinds time', do you have Solarwinds running somewhere ? 'Superadmin' is the built in admin account in Solarwinds...
You can actually generate these entries manually:
Router#send log 2 Message from 1(superadmin): ----- Start Of the day Thursday, March 7, 2019 0:09 ------- Mar 7 08:20:51.312
This will generate a syslog similar to the ones you see