trail-sense-database-persistence

To add Room persistence for a domain model, you create an Entity, DAO, and Repository, then update AppDatabase with a migration. This enables standard CRUD operations and durable storage while mapping data between the domain model and persistence constructs.

To preserve existing data when adding a new Room Entity, you implement an AppDatabase migration. This updates the database schema without losing existing records, ensuring standard CRUD operations remain intact for previously stored models.

Yes, you need a Kotlin-based Android project structure with Room tooling to use this persistence approach. The setup requires creating Room Entities, DAOs, and Repositories to enable CRUD operations within the Android environment.

To register a Room Repository as a singleton, you add it as a tool component for reuse across the Android app. This ensures consistent access to the persistence layer and CRUD operations without recreating database connections.

The best way to map a domain model to a Room Entity is by creating mapping logic within the Repository. This translates between the domain model and the persistence constructs, allowing the Entity and DAO to handle database CRUD operations cleanly.

A Room migration fails when the AppDatabase schema update does not match the new Entity definitions. You must implement the correct migration path to preserve existing data and ensure the persistence layer functions properly.