Implement Room database schemas and DataStore preferences with proper async patterns in Android. Use when defining Room entities, DAOs, migrations, or replacing SharedPreferences with DataStore.
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---
name: android-persistence
description: Implement Room database schemas and DataStore preferences with proper async patterns in Android. Use when defining Room entities, DAOs, migrations, or replacing SharedPreferences with DataStore.
metadata:
triggers:
files:
- '**/*Dao.kt'
- '**/*Database.kt'
- '**/*Entity.kt'
keywords:
- "@Dao"
- "@Entity"
- RoomDatabase
---
# Android Persistence Standards
## **Priority: P0**
## 1. Configure Room Database
- Return `Flow<List<T>>` for queries, use `suspend` for Write/Insert.
- Keep `@Entity` data classes simple. Map to Domain models in Repository.
- Use `@Transaction` for multi-table queries (Relations).
See [DAO templates](references/implementation.md) for Room DAO patterns.
## 2. Migrate to DataStore
- Replace `SharedPreferences` with `ProtoDataStore` (type-safe) or `PreferencesDataStore`.
- Inject singleton DataStore instance via Hilt.
See [DAO templates](references/implementation.md) for DataStore migration patterns.
## Anti-Patterns
- **No IO on Main Thread**: Room handles dispatchers, but verify Flow collected off-main.
- **No @Entity in UI Layer**: Map to Domain or UI models in Repository.
## References
- [DAO Templates](references/implementation.md)
