I have never made a vinegar based sause, not particularly fond of that type of bbq. However, regarding shelf life; I now have sauce (Tomato based) in the fridge that has been in there about 2 months. It's still fine.
Bo Compton in Mesa, AZ, KCBS CBJ
Weber Ranch Kettle, BDS Mega, OTS x 2, Weber Platinum
18.5 WSM w/Stacker from ProQ, 22.5 WSM, Reverse Flow Lang Clone 80 butt capacity mounted on 25 foot trailer with attached awnings
LFSA RED Thermapen,
And 1 2010 Victor brand Hot Dog Cart