[wingleeio]

Backports only the credit rate from 84f24f3 (on zeron/zgx) to main, without 6c4d8a0 or the other zeron/zgx edge commits it sits on.

What changes

• The rate goes by the UTC day the usage fell on. Days before CLOUD_CREDIT_RATE_FROM stay at 60 billable seconds a credit. From that day on, a credit costs CLOUD_CREDIT_SECONDS.
• The balance, plan periods, usage per day and a running machine's live estimate all use the per-day rate. The live estimate is split at midnight UTC.
• Production wrangler.jsonc: CLOUD_CREDIT_SECONDS: "30", CLOUD_CREDIT_RATE_FROM: "SET-AT-DEPLOY". Anything that isn't a real YYYY-MM-DD keeps every day at 60, so merging changes nothing until a deployer sets the day.
• Staging's block is untouched, so staging stays at 60.

Conflict resolution

• cloud-account.ts: kept main's size lookup. Main has no live resize (s.machine). Only the estimate now goes through unmeteredCredits.
• cloud.workerd.test.ts: kept main's policy import (no MACHINES) and added the metering imports.

Left out

• The "about N small-machine hours" copy in crates/ui, iOS and Android. Main's apps have no small machine to name, so the "about N hours" line stays as it is. Once a real day is set, that line (credits / 60) overstates hours on production's default machine by 2×.
• The apps/zgx copy changes. That app ships from zeron/zgx.

Deploying

Set CLOUD_CREDIT_RATE_FROM to a whole UTC day after the deploy day. Don't move or remove it once that day has come: doing so re-prices the days in between.

Tests (edge only)

• The new rate tests fail on origin/main: metering.test.ts doesn't load because the new exports are missing, 1 test fails in credit-pricing, and 5 workerd tests fail.
• On this branch, unit tests pass 250/250 and workerd tests pass 331/331. tsc --noEmit is clean.

🤖 Generated with Claude Code

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[wingleeio]

Deployed by hand to production on 2026-11-12 ~20:00 UTC: Cloudflare version 52798b85, built from this branch plus CHAT_RELAY_LAYER="1" (#1381) and CLOUD_CREDIT_RATE_FROM=2026-11-13, which is now committed here. After the deploy: install/releases links 200, all 11 secrets and every binding kept, 2,399 ok / 0 errors in 45 s of live traffic. Rollback: wrangler rollback e70b2a43-5230-40e4-9554-8ed13baa3df1 --name comet-native-edge (the version before, with Cloud for everyone and the relay on). Needs a review to merge; until it merges, a deploy from main would drop the rate back to 60.