migrate-schema

To plan a safe SwiftData schema migration with rollback, define your current and target schemas, classify the model changes, assess migration risks, and outline a data preservation and rollback strategy before deployment.

A SwiftData schema migration plan is a structured approach to evolving your data models safely by ensuring data preservation and concurrency-safe updates. You need one whenever you apply non-destructive changes to a Swift app using SwiftData.

To preserve data during a SwiftData model migration, you must document the current versus target schemas, classify the specific model changes, and apply a non-destructive migration pathway that includes a rollback strategy to revert if needed.

Yes, this SwiftData migration guide supports concurrency-safe updates by ensuring that schema migrations and model changes are planned with data safety and rollback strategies to prevent concurrency issues during deployment.

The best way to revert a SwiftData schema migration is to generate a rollback and deployment guidance plan beforehand, which outlines the exact steps to revert the model changes while ensuring data preservation.

Non-destructive SwiftData model migrations require careful change classification and risk assessment, meaning complex or destructive schema changes may need alternative strategies to ensure data preservation and safe rollback.