Android Persistence Standards

Priority: P0

Implementation Guidelines

Room

• Async: Return Flow<List<T>> for queries, use suspend for Write/Insert.
• Entities: Keep simple @Entity data classes. Map to Domain models in Repository.
• Transactions: Use @Transaction for multi-table queries (Relations).

DataStore

• Usage: Replace SharedPreferences with ProtoDataStore (Type-safe) or PreferencesDataStore.
• Scope: Inject singleton instance via Hilt.

Anti-Patterns

• Main Thread: **No IO on Main**: Use Dispatchers.IO (Room helper does this, but verify flow collection).
• Domain Leak: **No Entities in UI**: Map to Domain/UI Models.

References

• DAO Templates