Convex Migration Helper

Handles the tricky parts of Convex schema migrations when you need to change field types, add required fields, or restructure tables without breaking production. Walks you through the widen-migrate-narrow workflow, sets up the @convex-dev/migrations component for batched data updates, and generates the multi-deploy patterns you need to avoid schema validation failures. Most useful when you're staring at a deployment error because existing documents don't match your new schema. The migration patterns cover the common scenarios like splitting nested data into separate tables and changing field types, plus it catches the gotchas like using collect() on large tables.