Plan and execute Convex schema migrations safely with multi-deploy workflows and data transformation.

• Follows a predictable three-step pattern: widen schema, migrate data, narrow schema; handles online migrations where the app continues serving requests during async data updates
• Provides the @convex-dev/migrations component for batched, cursor-based pagination with state tracking, dry-run testing, progress monitoring, and automatic resume from failure
• Covers common patterns including adding required fields, deleting fields, changing field types, splitting nested data, and cleaning up orphaned documents
• Supports dual-write and dual-read strategies for zero-downtime migrations; includes a small-table shortcut for direct in-mutation backfills on tables under a few thousand documents