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Vibe codingMediumvc-g495
Subject Ai code reviewLevel Mid–Senior~16 minCommon in Databases & SQL interviewsIndustries Software development

Question

An AI wrote this Django management command to deactivate users who haven't logged in for a year. It runs nightly. On a 2-million-user table it takes hours and hammers the primary DB. Identify the inefficiency and rewrite it.

python
def deactivate_stale_users():    cutoff = timezone.now() - timedelta(days=365)    stale = User.objects.filter(last_login__lt=cutoff, is_active=True)    for user in stale:        user.is_active = False        user.save()        AuditLog.objects.create(user=user, action="auto_deactivate")
What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.

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Describe your solution

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

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