fix: reject quota deductions that would go negative - #2446
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fix: reject quota deductions that would go negative#2446BetterAndBetterII wants to merge 1 commit into
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Guard decreaseUserQuota and decreaseTokenQuota with a WHERE remaining >= amount check so concurrent consumption cannot drive balances below zero.
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decreaseUserQuotaanddecreaseTokenQuotaused an unguardedUPDATE ... SET quota = quota - ?. The sufficiency check happens earlier on a stale read, so concurrent requests can all pass and driveusers.quota/tokens.remain_quotanegative.This makes the deduction itself atomic: the UPDATE includes
WHERE remaining >= amountand treatsRowsAffected == 0as insufficient quota. Unlimited tokens are unchanged; callers already skipDecreaseTokenQuotawhenUnlimitedQuotais set.Fixes #2440