How long is cooked kielbasa good for in the refrigerator?
Sure. If it's the precooked sort as you mention, it will keep for several weeks if not longer.
I;ve grilled a package of hotdogs, and if kept after grilling and cooling in a cold fridge, they will keep for weeks on end.
Uncooked fresh ground kielbasa is far more perishable, but once cooked, it stays pretty stable as do the pre-cooked or pre-smoked types.