Where is it, physically
Lay out your racks and assign bottles to slots. Ask for a bottle and the answer comes with directions, so you stop excavating the back row to find the front one.
Is it ready
Drink windows are read out of whatever text you or a critic wrote — “2026–2040”, “drink now”, “within 10 years” — and every bottle is scored against this year: Hold, Drink Now, At Peak, or Past. Recalculated each time you look, so a 2019 note doesn't stay 2019 forever.
What is it worth
Record what you paid, refresh current values, and see profit and loss by bottle and across the cellar. Useful for insurance, for selling, and for knowing what you're actually opening on a Tuesday.
What's already open
Spirits don't go from sealed to gone. Log the fill level — full, half, down to the heel — and open bottles sort themselves into a kill list by how urgently they need finishing. Open vermouth gets a month, and it will tell you so.