diff --git a/Ledger/app/build.gradle.kts b/Ledger/app/build.gradle.kts
index 0a8e726..cc2088a 100644
--- a/Ledger/app/build.gradle.kts
+++ b/Ledger/app/build.gradle.kts
@@ -59,6 +59,8 @@ dependencies {
     implementation(libs.androidx.ui.graphics)
     implementation(libs.androidx.ui.tooling.preview)
     implementation(libs.androidx.material3)
+    implementation(libs.androidx.room.common)
+    implementation(libs.androidx.room.ktx)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/Entry.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/Entry.kt
new file mode 100644
index 0000000..68227df
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/Entry.kt
@@ -0,0 +1,4 @@
+package at.xaxa.ledger.data
+
+class Entry {
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/EntryRepository.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/EntryRepository.kt
new file mode 100644
index 0000000..d5bc885
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/EntryRepository.kt
@@ -0,0 +1,4 @@
+package at.xaxa.ledger.data
+
+class EntryRepository {
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryDao.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryDao.kt
new file mode 100644
index 0000000..f75a7cf
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryDao.kt
@@ -0,0 +1,30 @@
+package at.xaxa.ledger.data.db.Category
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Update
+import at.xaxa.ledger.data.db.Entry.EntryEntity
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface CategoryDao {
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    suspend fun addCategory(entryEntity: CategoryEntity)
+
+    @Update
+    suspend fun updateCategory(category: CharCategory)
+
+    @Delete
+    suspend fun deleteCategory(category: CharCategory)
+
+
+    @Query("SELECT * FROM category WHERE _id = :id")
+    suspend fun findCategoryById(id: Int) : CategoryEntity
+
+
+    @Query("SELECT * FROM category")
+    fun getAllCategory(): Flow<List<CategoryEntity>>
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryDatabase.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryDatabase.kt
new file mode 100644
index 0000000..9348871
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryDatabase.kt
@@ -0,0 +1,28 @@
+package at.xaxa.ledger.data.db.Category
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import at.xaxa.ledger.data.db.Entry.EntryDao
+
+@Database(entities = [CategoryEntity::class], version = 1)
+abstract class CategoryDatabase : RoomDatabase() {
+    abstract fun CategoryDao(): EntryDao
+
+    companion object {
+        @Volatile
+        private var Instance: CategoryDatabase? = null
+
+        fun getDatabase(context: Context): CategoryDatabase {
+            return Instance ?: synchronized(this){
+                val instance =
+                    Room.databaseBuilder(context, CategoryDatabase::class.java, "finance_database")
+                        .fallbackToDestructiveMigration()
+                        .build()
+                Instance = instance
+                return instance
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryEntity.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryEntity.kt
new file mode 100644
index 0000000..413dab0
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Category/CategoryEntity.kt
@@ -0,0 +1,12 @@
+package at.xaxa.ledger.data.db.Category
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "category")
+data class CategoryEntity(
+    @PrimaryKey(autoGenerate = true)
+    val _id: Int = 0,
+    val name: String,
+    val icon: Int
+)
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryDao.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryDao.kt
new file mode 100644
index 0000000..bcddeaf
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryDao.kt
@@ -0,0 +1,29 @@
+package at.xaxa.ledger.data.db.Entry
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Update
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface EntryDao {
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    suspend fun addEntry(entryEntity: EntryEntity)
+
+    @Update
+    suspend fun updateEntry(entryEntity: EntryEntity)
+
+    @Delete
+    suspend fun deleteEntry(entryEntity: EntryEntity)
+
+
+    @Query("SELECT * FROM transaction WHERE _id = :id")
+    suspend fun findEntryById(id: Int) : EntryEntity
+
+
+    @Query("SELECT * FROM transaction")
+    fun getAllEntries(): Flow<List<EntryEntity>>
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryDatabase.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryDatabase.kt
new file mode 100644
index 0000000..ba70eae
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryDatabase.kt
@@ -0,0 +1,27 @@
+package at.xaxa.ledger.data.db.Entry
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [EntryEntity::class], version = 1)
+abstract class EntryDatabase : RoomDatabase() {
+    abstract fun EntryDao(): EntryDao
+
+    companion object {
+        @Volatile
+        private var Instance: EntryDatabase? = null
+
+        fun getDatabase(context: Context): EntryDatabase {
+            return Instance ?: synchronized(this){
+                val instance =
+                    Room.databaseBuilder(context, EntryDatabase::class.java, "finance_database")
+                        .fallbackToDestructiveMigration()
+                        .build()
+                Instance = instance
+                return instance
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryEntity.kt b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryEntity.kt
new file mode 100644
index 0000000..f8d2614
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/data/db/Entry/EntryEntity.kt
@@ -0,0 +1,14 @@
+package at.xaxa.ledger.data.db.Entry
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "transaction")
+data class EntryEntity(
+    @PrimaryKey(autoGenerate = true)
+    val _id: Int = 0,
+    val name: String,
+    val amount: Float,
+    val date: Long,
+    val category: Int
+)
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/AppViewModelProvider.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/AppViewModelProvider.kt
new file mode 100644
index 0000000..51c31cc
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/AppViewModelProvider.kt
@@ -0,0 +1,5 @@
+package at.xaxa.ledger.ui
+
+object AppViewModelProvider {
+
+}
\ No newline at end of file
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/add/AddUI.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/add/AddUI.kt
new file mode 100644
index 0000000..bea04de
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/add/AddUI.kt
@@ -0,0 +1,2 @@
+package at.xaxa.ledger.ui.add
+
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/add/AddViewModel.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/add/AddViewModel.kt
new file mode 100644
index 0000000..bea04de
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/add/AddViewModel.kt
@@ -0,0 +1,2 @@
+package at.xaxa.ledger.ui.add
+
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/edit/EditUI.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/edit/EditUI.kt
new file mode 100644
index 0000000..772c30d
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/edit/EditUI.kt
@@ -0,0 +1,2 @@
+package at.xaxa.ledger.ui.edit
+
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/edit/EditViewModel.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/edit/EditViewModel.kt
new file mode 100644
index 0000000..772c30d
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/edit/EditViewModel.kt
@@ -0,0 +1,2 @@
+package at.xaxa.ledger.ui.edit
+
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/home/HomeUI.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/home/HomeUI.kt
new file mode 100644
index 0000000..1928f38
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/home/HomeUI.kt
@@ -0,0 +1,2 @@
+package at.xaxa.ledger.ui.home
+
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/home/HomeViewModel.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/home/HomeViewModel.kt
new file mode 100644
index 0000000..1928f38
--- /dev/null
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/home/HomeViewModel.kt
@@ -0,0 +1,2 @@
+package at.xaxa.ledger.ui.home
+
diff --git a/Ledger/gradle/libs.versions.toml b/Ledger/gradle/libs.versions.toml
index 4b06795..426c4de 100644
--- a/Ledger/gradle/libs.versions.toml
+++ b/Ledger/gradle/libs.versions.toml
@@ -8,6 +8,8 @@ espressoCore = "3.6.1"
 lifecycleRuntimeKtx = "2.8.7"
 activityCompose = "1.9.3"
 composeBom = "2024.04.01"
+roomCommon = "2.6.1"
+roomKtx = "2.6.1"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -24,6 +26,8 @@ androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-toolin
 androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
 androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
 androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
+androidx-room-common = { group = "androidx.room", name = "room-common", version.ref = "roomCommon" }
+androidx-room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "roomKtx" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }