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puter/src
404oopsandClaude Opus 5.5 57b5ea6e00 fix(metering): reserve AI credit only when it fits, in one step
`reserveAiCredits` checked the balance and then took an unconditional
hold, so concurrent requests could all pass the check before any hold
was visible; two 16.2M µ¢ holds were admitted against a 20M µ¢ balance.

The hold store now takes a hold only if it fits beside the live holds,
in one Lua script on the actor's hold key. A per-user version, bumped
when usage is recorded and when a hold is released, lets the script
refuse a balance read that a settlement has since overtaken; the
service reads the balance again and retries, and skips the version
check on its last attempt rather than refuse an account whose balance
keeps moving. Both keys share the actor's hash tag, so the script runs
on Redis Cluster. The balance read for this check reads purchased
credit consistently.

`reserveCreditsIfAffordable` carries this through the service, and the
AI facade calls it once with the cost factor applied. `reserveCredits`
keeps its unconditional semantics. When the cache is unreachable, the
balance alone decides and nothing is held, as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-11-05 14:06:43 +01:00
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