Weeknight.

App Building · 888 chars

Diagnose a failed deploy

Paste the build log; get the plain-English cause and the smallest fix to make the deploy green — instead of guessing at a wall of red text.

#deployment#vercel#debugging#nextjs#build

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Design a database schema with security built in

Describe what your app stores; get tables, an owner column, and Row-Level Security turned on from the first migration — not bolted on after you've leaked data.

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Write or fix your Row-Level Security policies

Paste your tables; get correct per-action RLS policies — the thing that actually stops one user from reading another user's rows.

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Prove your RLS actually protects data

The step everyone skips: a two-account test that SHOULD fail to read another user's rows — so you know the lock holds instead of hoping it does.

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Wire up passwordless (magic-link) auth

Add email magic-link sign-in/out to a Next.js + Supabase app, using the correct server/client split so sessions actually persist across refreshes.

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