Room Database Architecture: Offline-First SQLite Caching in Modern Android Apps

Why Offline-First Architecture is Critical

Mobile networks are inherently unreliable. Apps that show blank screens or spinning loaders when network sockets disconnect frustrate users. The Single Source of Truth (SSOT) pattern utilizes Room Database to persist data locally, serving cached content instantly while synchronizing with remote APIs in the background.

1. Entity, DAO and Database Definitions

@Entity(tableName = "articles")
data class ArticleEntity(
    @PrimaryKey val id: Int,
    val title: String,
    val summary: String,
    val content: String,
    val updatedAt: Long
)

@Dao
interface ArticleDao {
    @Query("SELECT * FROM articles ORDER BY updatedAt DESC")
    fun getAllArticles(): Flow>

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertArticles(articles: List)
}

Pairing Room with Kotlin Flow provides reactive data binding directly into Jetpack Compose screens.