Data Layer

The data layer owns remote API access, local persistence, and repository implementations.

Shared infrastructure

• core:data: preferences and locale handling
• core:database: Room foundation
• core:network: Retrofit, OkHttp, BaseRepository, auth components

Feature data module

A feature data module owns that feature’s repository implementation, DTOs, mappers, and local/remote source integration.

Checklist

• [ ] DTOs are separate from domain models.
• [ ] Repository interface is in domain.
• [ ] Implementation is in data.
• [ ] Sensitive data is not stored as regular preferences.