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This is really interesting

how does the cron jobs work? Like if you add a PWA on the phone and set cron job tasks, how does it know to execute if the PWA is not open at the time?

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Thanks! Currently the scheduler runs on the main thread. It checks every 60s and fires due tasks while the app is open. So it works well for recurring prompts during active use, but won't fire if the PWA is closed since browsers don't support persistent background timers. Periodic Background Sync is the closest web API but it's Chrome-only with no timing guarantees, so for now pinning the tab is the reliable path.

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