The Abrahamic Convergence continues - Yom Kippur is upon us. Naftali explains that the 9th of the month is the day to eat plentifully so that the mandatory fast upon the 10th goes smoothly, as commanded in the Torah. So, in a sense, today is a day-long sehri for our Jewish friends :)
The traditional greeting above means, "May your inscription for good in the book of life be therein sealed completely." So it shall be written, inshallah.