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UpdatedFebruary 4, 2026 at 06:03

Standards for Room Database and DataStore

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name	Android Persistence
description	Standards for Room Database and DataStore
metadata	{"labels":["android","persistence","room","database"],"triggers":{"files":["*/Dao.kt","*/Database.kt","*/Entity.kt"],"keywords":["@Dao","@Entity","RoomDatabase"]}}

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

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name	Android Persistence
description	Standards for Room Database and DataStore
metadata	{"labels":["android","persistence","room","database"],"triggers":{"files":["*/Dao.kt","*/Database.kt","*/Entity.kt"],"keywords":["@Dao","@Entity","RoomDatabase"]}}

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