There have been some concerns recently over Webkit making Progressive Web Apps impractical by clearing their data after seven days.
They've updated the post; turns out it doesn't hold for PWA's. Phew! Lower your pitchforks:
> We do not expect the first-party in such a web application to have its website data deleted.
> If your web application does experience website data deletion, please let us know since we would consider it a serious bug.
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