Optionaltier: stringOptionalamount: numberToday's usage for every tracked user.
Optionaltier: stringExtra allowance for today only (rewards/promos).
Peek without spending.
Optionaltier: stringReady-to-send quota line for one user.
Optionaltier: stringReset one user, or everyone when omitted.
Optionaluser: stringChange a tier's daily limit at runtime.
Spend from today's quota.