Tom Bombadil wrote:
quoted text
> Greetings...
> 
> By any chance, will spamd delete any IPs that I add manually to spamd-white?

You won't be playing with spamd-white table except for testing.
You should declare your whitelist to spamd.conf

white:\
	:white:\
	:method=file:\
	:file=/var/mail/mywhite.txt:


quoted text
> spamd(8) says:
> "spamd regularly scans the /var/db/spamd database and configures all
>  whitelist addresses as the spamd-white pf(4) table."
> 
> How exactly does spamd configure spamd-white table?

spamd exactly executes the command
	pfctl -p /dev/pf -q -t spamd-white -T replace -f -
by supplying the whitelist as the standard input.

quoted text
> The objective is to safely add my own IPs to the whitelist.

As stated above, please use spamd.conf
man 5 spamd.conf   will help much.