Migrate a Rails App to Next.js with Claude Code

Read this Rails repo and produce a migration audit: list of routes, models, services, view templates, ActiveJob jobs, and external integrations. Flag anything that doesn't have a clean Next/JS equivalent.

Propose the target Next.js 14 architecture: App Router vs Pages Router, server components, API route layout, ORM choice (Prisma/Drizzle), background job runner replacement. Justify each choice.

Write a phased database migration plan that allows both Rails and Next to read/write during transition. Identify exact steps for cutover including monitoring and rollback.

Translate Rails ActiveRecord models to Prisma schema. Preserve table names, add indexes that Rails added implicitly, and document any quirks.

For each Rails controller action, generate the equivalent Next.js route handler with input validation, auth, and same response shape.

Convert ERB templates to React server components. Preserve the URL structure exactly so external links don't break.

Translate ActiveJob jobs to a queue-based runner (BullMQ/QStash). Keep the same job names and arguments for observability continuity.

Produce a deployment sequence with pre-cutover checks, traffic-shift strategy, monitoring, and a rollback path. The cutover must be revertible within 5 minutes.