Setting up design tokens for fieldnotes UI
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.
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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.
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.
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.