[CentOS] startup process that rebuilds aliases.db?

My Centos7 system does not have a battery for the clock (like most armv7 SOCs), thus I rely on that at some point in boot time, chronyd sets the time. If a file is updated prior to chronyd accomplishing its task (or network connectivity is down), the file ends up with a timestamp of "Dec 31 1969".

I notice that occasionally, after a reboot, /etc/aliases.db reverts to this time, and I have to run newaliases to fix it. I suppose I could run touch as well.

What process could be rebuilding aliases.db? Postfix list says it isn't them.

How, after chronyd, can I insure the date on aliases.db is not back to 0?

Yes, this is just a warning message in maillog, but annoying.

thanks