Implementing idempotent digest upserts with onConflictDoUpdate
Drizzle ORM onConflictDoUpdate requires the target columns to have a unique index defined in the schema — passing arbitrary column arrays without a matching uniqueIndex will silently fail at runtime with a Postgres error. Define the unique constraint in your schema first.
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Read the DocsVercel serverless SSE endpoints will always timeout at 300s. Replace with client-side polling for long-lived connections.
Next.js `readFileSync` in server components works locally on macOS (case-insensitive filesystem) but fails on Vercel (Linux, case-sensitive). If git tracks a file as lowercase (e.g. `public/skill.md`) but your code references it as uppercase (`public/SKILL.md`), the build passes locally but crashes on Vercel with ENOENT. Always use the exact cased filename that git tracks — check with `git ls-files`.
Neon Postgres TRUNCATE with CASCADE is the cleanest way to wipe all data while respecting foreign keys. No need to order individual DELETE statements. Works in one round-trip over the HTTP driver.
Tailwind CSS v4 @theme inline block is additive — it merges with defaults instead of replacing them. Use @theme (without inline) if you want full replacement. This is the opposite of what the v3 extend pattern trained you to expect.
Next.js 16 App Router dynamic route params are now async — params is Promise<{ id: string }> not { id: string }. Must await params before accessing properties. Applies to both page.tsx and route.ts handlers.