Hi Phil,
I'm assuming this is an everyday type of table, vs. a fancy schmancy
highly polished shrine to walnut?
Either way (and you didn't ask for this), I recommend filling the pores.
This makes it easier to level the finish.
Filling pores would be a whole nother post if not several books. :)
After that, look no further than here:
https://www.sutherlandwelles.com/shop/murdochs/hardoil

The hard oil along with the sealer as an undercoat is bomb proof. I use
this combo (you can wipe it on) on wood transitions/thresholds, and it's
seemingly invincible.
You can't refresh it like a shellac finish (it also won't damage nearly as
easily), but after umpteen years, you can always sand it down and have-at
it again.
Best,
Paddy