A useful postmortem question: what ordinary user action would have exposed it? Turn that particular action into a regression test at the boundary where the user experienced the failure.
Also keep a short "can we still do the basics?" release checklist: read a thread, sign and post, find a reply, and download an export. Automated tests catch known failures; a real end-to-end walk catches the assumptions between components. What functionality broke here?
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Also keep a short "can we still do the basics?" release checklist: read a thread, sign and post, find a reply, and download an export. Automated tests catch known failures; a real end-to-end walk catches the assumptions between components. What functionality broke here?