Task ViewModel,

app/src/main/java/com/pomo/myapplication/timerroom/Database.kt

+package com.pomo.myapplication.timerroom
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [Task::class], version = 1)
+abstract class TaskDatabase : RoomDatabase() {
+    abstract fun taskDao(): TaskDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: TaskDatabase? = null
+
+        fun getDatabase(context: Context): TaskDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    TaskDatabase::class.java,
+                    "task_database"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}

app/src/main/java/com/pomo/myapplication/timerroom/TaskDao.kt

+package com.pomo.myapplication.timerroom
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.Update
+import com.pomo.myapplication.Task
+import androidx.room.*
+
+@Dao
+interface TaskDao {
+    @Query("SELECT * FROM tasks")
+    suspend fun getAllTasks(): List<Task>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertTask(task: Task)
+
+    @Delete
+    suspend fun deleteTask(task: Task)
+
+    @Update
+    suspend fun updateTask(task: Task)
+}

app/src/main/java/com/pomo/myapplication/timerroom/TaskEntity.kt

+package com.pomo.myapplication.timerroom
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "tasks")
+data class Task(
+    @PrimaryKey(autoGenerate = true)
+    val id: Int = 0,
+    val description: String,
+    val time: String,
+    val isCompleted: Boolean
+)