diff --git a/.idea/appInsightsSettings.xml b/.idea/appInsightsSettings.xml
new file mode 100644
index 0000000..371f2e2
--- /dev/null
+++ b/.idea/appInsightsSettings.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AppInsightsSettings">
+    <option name="tabSettings">
+      <map>
+        <entry key="Firebase Crashlytics">
+          <value>
+            <InsightsFilterSettings>
+              <option name="connection">
+                <ConnectionSetting>
+                  <option name="appId" value="PLACEHOLDER" />
+                  <option name="mobileSdkAppId" value="" />
+                  <option name="projectId" value="" />
+                  <option name="projectNumber" value="" />
+                </ConnectionSetting>
+              </option>
+              <option name="signal" value="SIGNAL_UNSPECIFIED" />
+              <option name="timeIntervalDays" value="THIRTY_DAYS" />
+              <option name="visibilityType" value="ALL" />
+            </InsightsFilterSettings>
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 8b2c35e..ec57099 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.jetbrains.kotlin.android)
+    id("com.google.devtools.ksp") version "1.9.22-1.0.16"
 }
 
 android {
@@ -66,4 +67,17 @@ dependencies {
     androidTestImplementation(libs.ui.test.junit4)
     debugImplementation(libs.ui.tooling)
     debugImplementation(libs.ui.test.manifest)
+
+    // Room Database - TAMBAHKAN INI SEMUA
+    val roomVersion = "2.6.1"
+    implementation("androidx.room:room-runtime:$roomVersion")
+    implementation("androidx.room:room-ktx:$roomVersion")
+    ksp("androidx.room:room-compiler:$roomVersion")
+
+    // Coroutines
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.0")
+
+    // ViewModel & Lifecycle
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-compose:2.7.0")
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/notebook/MainActivity.kt b/app/src/main/java/com/example/notebook/MainActivity.kt
index 41a997b..2d8bde0 100644
--- a/app/src/main/java/com/example/notebook/MainActivity.kt
+++ b/app/src/main/java/com/example/notebook/MainActivity.kt
@@ -33,6 +33,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
+import com.example.notebook.data.DatabaseTest
 import com.example.notebook.ui.theme.NotebookTheme
 
 class MainActivity : ComponentActivity() {
diff --git a/app/src/main/java/com/example/notebook/data/AppDatabase.kt b/app/src/main/java/com/example/notebook/data/AppDatabase.kt
new file mode 100644
index 0000000..9464132
--- /dev/null
+++ b/app/src/main/java/com/example/notebook/data/AppDatabase.kt
@@ -0,0 +1,44 @@
+package com.example.notebook.data
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+/**
+ * Database utama aplikasi
+ * Version 1 = versi pertama database kamu
+ */
+@Database(
+    entities = [
+        NotebookEntity::class,
+        SourceEntity::class,
+        ChatMessageEntity::class
+    ],
+    version = 1,
+    exportSchema = false
+)
+abstract class AppDatabase : RoomDatabase() {
+
+    abstract fun notebookDao(): NotebookDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: AppDatabase? = null
+
+        /**
+         * Singleton pattern - hanya ada 1 instance database
+         */
+        fun getDatabase(context: Context): AppDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    AppDatabase::class.java,
+                    "notebook_database"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/notebook/data/DatabaseTest.kt b/app/src/main/java/com/example/notebook/data/DatabaseTest.kt
new file mode 100644
index 0000000..903d9a6
--- /dev/null
+++ b/app/src/main/java/com/example/notebook/data/DatabaseTest.kt
@@ -0,0 +1,31 @@
+package com.example.notebook.data
+
+import android.content.Context
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+/**
+ * Helper untuk test database
+ * Panggil fungsi ini dari MainActivity untuk test
+ */
+class DatabaseTest(private val context: Context) {
+
+    private val database = AppDatabase.getDatabase(context)
+    private val dao = database.notebookDao()
+
+    fun testInsertNotebook() {
+        CoroutineScope(Dispatchers.IO).launch {
+            val testNotebook = NotebookEntity(
+                title = "Notebook Test",
+                description = "Ini adalah test database",
+                createdAt = System.currentTimeMillis(),
+                updatedAt = System.currentTimeMillis(),
+                sourceCount = 0
+            )
+
+            val id = dao.insertNotebook(testNotebook)
+            println("✅ Database Test: Notebook berhasil disimpan dengan ID: $id")
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/notebook/data/NotebookDao.kt b/app/src/main/java/com/example/notebook/data/NotebookDao.kt
new file mode 100644
index 0000000..1e64801
--- /dev/null
+++ b/app/src/main/java/com/example/notebook/data/NotebookDao.kt
@@ -0,0 +1,51 @@
+package com.example.notebook.data
+
+import androidx.room.*
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * DAO (Data Access Object) untuk mengakses database
+ * Semua fungsi ini otomatis dihandle Room
+ */
+@Dao
+interface NotebookDao {
+
+    // === NOTEBOOK OPERATIONS ===
+
+    @Insert
+    suspend fun insertNotebook(notebook: NotebookEntity): Long
+
+    @Update
+    suspend fun updateNotebook(notebook: NotebookEntity)
+
+    @Delete
+    suspend fun deleteNotebook(notebook: NotebookEntity)
+
+    @Query("SELECT * FROM notebooks ORDER BY updatedAt DESC")
+    fun getAllNotebooks(): Flow<List<NotebookEntity>>
+
+    @Query("SELECT * FROM notebooks WHERE id = :notebookId")
+    fun getNotebookById(notebookId: Int): Flow<NotebookEntity?>
+
+    // === SOURCE OPERATIONS ===
+
+    @Insert
+    suspend fun insertSource(source: SourceEntity)
+
+    @Query("SELECT * FROM sources WHERE notebookId = :notebookId")
+    fun getSourcesByNotebook(notebookId: Int): Flow<List<SourceEntity>>
+
+    @Delete
+    suspend fun deleteSource(source: SourceEntity)
+
+    // === CHAT OPERATIONS ===
+
+    @Insert
+    suspend fun insertChatMessage(message: ChatMessageEntity)
+
+    @Query("SELECT * FROM chat_messages WHERE notebookId = :notebookId ORDER BY timestamp ASC")
+    fun getChatHistory(notebookId: Int): Flow<List<ChatMessageEntity>>
+
+    @Query("DELETE FROM chat_messages WHERE notebookId = :notebookId")
+    suspend fun clearChatHistory(notebookId: Int)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/notebook/data/NotebookEntity.kt b/app/src/main/java/com/example/notebook/data/NotebookEntity.kt
new file mode 100644
index 0000000..3eeac80
--- /dev/null
+++ b/app/src/main/java/com/example/notebook/data/NotebookEntity.kt
@@ -0,0 +1,48 @@
+package com.example.notebook.data
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+/**
+ * Entity untuk menyimpan data Notebook di database
+ */
+@Entity(tableName = "notebooks")
+data class NotebookEntity(
+    @PrimaryKey(autoGenerate = true)
+    val id: Int = 0,
+
+    val title: String,           // Judul notebook
+    val description: String,     // Deskripsi singkat
+    val createdAt: Long,         // Timestamp pembuatan
+    val updatedAt: Long,         // Timestamp update terakhir
+    val sourceCount: Int = 0     // Jumlah sumber yang diupload
+)
+
+/**
+ * Entity untuk menyimpan sumber/dokumen yang diupload
+ */
+@Entity(tableName = "sources")
+data class SourceEntity(
+    @PrimaryKey(autoGenerate = true)
+    val id: Int = 0,
+
+    val notebookId: Int,         // Foreign key ke notebook
+    val fileName: String,        // Nama file
+    val fileType: String,        // Tipe: PDF, Image, Text, dll
+    val filePath: String,        // Path file di storage
+    val uploadedAt: Long         // Timestamp upload
+)
+
+/**
+ * Entity untuk menyimpan chat history dengan AI
+ */
+@Entity(tableName = "chat_messages")
+data class ChatMessageEntity(
+    @PrimaryKey(autoGenerate = true)
+    val id: Int = 0,
+
+    val notebookId: Int,         // Foreign key ke notebook
+    val message: String,         // Isi pesan
+    val isUserMessage: Boolean,  // true = user, false = AI
+    val timestamp: Long          // Kapan pesan dikirim
+)
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index c1e23bc..15498bd 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -2,4 +2,5 @@
 plugins {
     alias(libs.plugins.android.application) apply false
     alias(libs.plugins.jetbrains.kotlin.android) apply false
+    id("com.google.devtools.ksp") version "1.9.22-1.0.16" apply false
 }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index b0b9771..23f3239 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-agp = "8.2.2"
+agp = "8.13.1"
 kotlin = "1.9.22"
 coreKtx = "1.12.0"
 junit = "4.13.2"