Plan and execute Convex schema migrations safely with zero-downtime data transformations.

• Covers safe additive changes (optional fields, new tables, indexes) that require no migration code, and breaking changes (required fields, type changes, renames) that need custom migration functions
• Provides patterns for batch processing, scheduled migrations via cron jobs, and dual-write strategies to maintain app availability during transitions
• Includes complete examples for common scenarios: adding required fields, changing field types, renaming fields, and migrating from nested to relational data structures
• Offers a migration checklist and verification queries to confirm all records have been successfully transformed before removing old schema fields