Finally, set a two-minute trigger: Tools → Script editor → Current project triggers → Add trigger → choose function "zeroAlert", event "On edit", notifications daily at 07:00. You’ll get an email each morning if any category slips negative, keeping the balance at exact zero without daily nannying.

Crave a instant kill-switch button? Fire "Token Authentication" in your CDN. Stick ?token=hash($secret.$path.$expiry) to each href. When you block the ultra-long secret, every endpoint that relies on it vanishes in 24 h, 0.8 if co-working. Velocity Ratio = 7-day XP ÷ previous week