Removed the JSON storage and opted for room database

android/app/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
     alias(libs.plugins.kotlin.compose)  // v1.5.0: Jetpack Compose Compiler
     alias(libs.plugins.ktlint)  // ✅ v1.6.1: Reaktiviert nach Code-Cleanup
     alias(libs.plugins.detekt)
+    alias(libs.plugins.ksp)
 }
 
 import java.util.Properties
@@ -162,6 +163,15 @@ dependencies {
     implementation(libs.androidx.lifecycle.runtime.compose)
     debugImplementation(libs.androidx.compose.ui.tooling)
 
+    // Koin
+    implementation(libs.koin.android)
+    implementation(libs.koin.androidx.compose)
+
+    // Room
+    implementation(libs.room.runtime)
+    implementation(libs.room.ktx)
+    ksp(libs.room.compiler)
+
     // ═══════════════════════════════════════════════════════════════════════
     // 🆕 v1.8.0: Homescreen Widgets
     // ═══════════════════════════════════════════════════════════════════════

android/app/src/main/AndroidManifest.xml

@@ -44,12 +44,6 @@
             </intent-filter>
         </activity>
 
-        <!-- Legacy MainActivity (XML-based) - kept for reference -->
-        <activity
-            android:name=".MainActivity"
-            android:exported="false"
-            android:theme="@style/Theme.SimpleNotes" />
-
         <!-- Editor Activity (Legacy - XML-based) -->
         <activity
             android:name=".NoteEditorActivity"

android/app/src/main/java/dev/dettmer/simplenotes/MainActivity.kt

@@ -1,856 +0,0 @@
-@file:Suppress("DEPRECATION") // Legacy code using LocalBroadcastManager, will be removed in v2.0.0
-
-package dev.dettmer.simplenotes
-
-import android.Manifest
-import android.content.BroadcastReceiver
-import android.content.Context
-import android.content.Intent
-import android.content.IntentFilter
-import android.content.pm.PackageManager
-import android.os.Build
-import android.os.Bundle
-import dev.dettmer.simplenotes.utils.Logger
-import android.view.Menu
-import android.view.MenuItem
-import androidx.appcompat.app.AppCompatActivity
-import androidx.localbroadcastmanager.content.LocalBroadcastManager
-import androidx.recyclerview.widget.ItemTouchHelper
-import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.recyclerview.widget.RecyclerView
-import com.google.android.material.appbar.MaterialToolbar
-import com.google.android.material.color.DynamicColors
-import com.google.android.material.floatingactionbutton.FloatingActionButton
-import com.google.android.material.snackbar.Snackbar
-import com.google.android.material.card.MaterialCardView
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import dev.dettmer.simplenotes.adapters.NotesAdapter
-import dev.dettmer.simplenotes.models.Note
-import dev.dettmer.simplenotes.storage.NotesStorage
-import dev.dettmer.simplenotes.sync.SyncWorker
-import dev.dettmer.simplenotes.utils.NotificationHelper
-import dev.dettmer.simplenotes.utils.showToast
-import dev.dettmer.simplenotes.utils.Constants
-import android.widget.TextView
-import android.widget.CheckBox
-import android.widget.Toast
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.launch
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-import dev.dettmer.simplenotes.sync.WebDavSyncService
-import dev.dettmer.simplenotes.sync.SyncStateManager
-import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-import android.view.View
-import android.widget.LinearLayout
-import android.view.Gravity
-import android.widget.PopupMenu
-import dev.dettmer.simplenotes.models.NoteType
-
-/**
- * Legacy MainActivity - DEPRECATED seit v1.5.0, wird entfernt in v2.0.0
- * Ersetzt durch ComposeMainActivity
- */
-@Suppress("DEPRECATION") // Legacy code using LocalBroadcastManager, will be removed in v2.0.0
-class MainActivity : AppCompatActivity() {
-    
-    private lateinit var recyclerViewNotes: RecyclerView
-    private lateinit var emptyStateCard: MaterialCardView
-    private lateinit var fabAddNote: FloatingActionButton
-    private lateinit var toolbar: MaterialToolbar
-    private lateinit var swipeRefreshLayout: SwipeRefreshLayout
-    
-    // 🔄 v1.3.1: Sync Status Banner
-    private lateinit var syncStatusBanner: LinearLayout
-    private lateinit var syncStatusText: TextView
-    
-    private lateinit var adapter: NotesAdapter
-    private val storage by lazy { NotesStorage(this) }
-    
-    // Menu reference for sync button state
-    private var optionsMenu: Menu? = null
-    
-    // Track pending deletions to prevent flicker when notes reload
-    private val pendingDeletions = mutableSetOf<String>()
-    
-    private val prefs by lazy {
-        getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
-    }
-    
-    companion object {
-        private const val TAG = "MainActivity"
-        private const val REQUEST_NOTIFICATION_PERMISSION = 1001
-        private const val REQUEST_SETTINGS = 1002
-        private const val MIN_AUTO_SYNC_INTERVAL_MS = 60_000L // 1 Minute
-        private const val PREF_LAST_AUTO_SYNC_TIME = "last_auto_sync_timestamp"
-        private const val SYNC_COMPLETED_DELAY_MS = 1500L
-        private const val ERROR_DISPLAY_DELAY_MS = 3000L
-    }
-    
-    /**
-     * BroadcastReceiver für Background-Sync Completion (Periodic Sync)
-     */
-    private val syncCompletedReceiver = object : BroadcastReceiver() {
-        override fun onReceive(context: Context?, intent: Intent?) {
-            val success = intent?.getBooleanExtra("success", false) ?: false
-            val count = intent?.getIntExtra("count", 0) ?: 0
-            
-            Logger.d(TAG, "📡 Sync completed broadcast received: success=$success, count=$count")
-            
-            // UI refresh
-            if (success && count > 0) {
-                loadNotes()
-                Logger.d(TAG, "🔄 Notes reloaded after background sync")
-            }
-        }
-    }
-    
-    override fun onCreate(savedInstanceState: Bundle?) {
-        // Install Splash Screen (Android 12+)
-        installSplashScreen()
-        
-        super.onCreate(savedInstanceState)
-        
-        // Apply Dynamic Colors for Android 12+ (Material You)
-        DynamicColors.applyToActivityIfAvailable(this)
-        
-        setContentView(R.layout.activity_main)
-        
-        // Logger initialisieren und File-Logging aktivieren wenn eingestellt
-        Logger.init(this)
-        if (prefs.getBoolean(Constants.KEY_FILE_LOGGING_ENABLED, false)) {
-            Logger.setFileLoggingEnabled(true)
-        }
-        
-        // Alte Sync-Notifications beim App-Start löschen
-        NotificationHelper.clearSyncNotifications(this)
-        
-        // Permission für Notifications (Android 13+)
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-            requestNotificationPermission()
-        }
-        
-        // 🌍 v1.7.2: Debug Locale für Fehlersuche
-        logLocaleInfo()
-        
-        findViews()
-        setupToolbar()
-        setupRecyclerView()
-        setupFab()
-        
-        // v1.4.1: Migrate checklists for backwards compatibility
-        migrateChecklistsForBackwardsCompat()
-        
-        loadNotes()
-        
-        // 🔄 v1.3.1: Observe sync state for UI updates
-        setupSyncStateObserver()
-    }
-    
-    /**
-     * 🔄 v1.3.1: Beobachtet Sync-Status für UI-Feedback
-     */
-    private fun setupSyncStateObserver() {
-        SyncStateManager.syncStatus.observe(this) { status ->
-            when (status.state) {
-                SyncStateManager.SyncState.SYNCING -> {
-                    // Disable sync controls
-                    setSyncControlsEnabled(false)
-                    // 🔄 v1.3.1: Show sync status banner (ersetzt SwipeRefresh-Animation)
-                    syncStatusText.text = getString(R.string.sync_status_syncing)
-                    syncStatusBanner.visibility = View.VISIBLE
-                }
-                SyncStateManager.SyncState.COMPLETED -> {
-                    // Re-enable sync controls
-                    setSyncControlsEnabled(true)
-                    swipeRefreshLayout.isRefreshing = false
-                    // Show completed briefly, then hide
-                    syncStatusText.text = status.message ?: getString(R.string.sync_status_completed)
-                    lifecycleScope.launch {
-                        kotlinx.coroutines.delay(SYNC_COMPLETED_DELAY_MS)
-                        syncStatusBanner.visibility = View.GONE
-                        SyncStateManager.reset()
-                    }
-                }
-                SyncStateManager.SyncState.ERROR -> {
-                    // Re-enable sync controls
-                    setSyncControlsEnabled(true)
-                    swipeRefreshLayout.isRefreshing = false
-                    // Show error briefly, then hide
-                    syncStatusText.text = status.message ?: getString(R.string.sync_status_error)
-                    lifecycleScope.launch {
-                        kotlinx.coroutines.delay(ERROR_DISPLAY_DELAY_MS)
-                        syncStatusBanner.visibility = View.GONE
-                        SyncStateManager.reset()
-                    }
-                }
-                SyncStateManager.SyncState.IDLE -> {
-                    setSyncControlsEnabled(true)
-                    swipeRefreshLayout.isRefreshing = false
-                    syncStatusBanner.visibility = View.GONE
-                }
-                // v1.5.0: Silent-Sync - Banner nicht anzeigen, aber Sync-Controls deaktivieren
-                SyncStateManager.SyncState.SYNCING_SILENT -> {
-                    setSyncControlsEnabled(false)
-                    // Kein Banner anzeigen bei Silent-Sync (z.B. onResume Auto-Sync)
-                }
-            }
-        }
-    }
-    
-    /**
-     * 🔄 v1.3.1: Aktiviert/deaktiviert Sync-Controls (Button + SwipeRefresh)
-     */
-    private fun setSyncControlsEnabled(enabled: Boolean) {
-        // Menu Sync-Button
-        optionsMenu?.findItem(R.id.action_sync)?.isEnabled = enabled
-        // SwipeRefresh
-        swipeRefreshLayout.isEnabled = enabled
-    }
-    
-    override fun onResume() {
-        super.onResume()
-        
-        Logger.d(TAG, "📱 MainActivity.onResume() - Registering receivers")
-        
-        // Register BroadcastReceiver für Background-Sync
-        LocalBroadcastManager.getInstance(this).registerReceiver(
-            syncCompletedReceiver,
-            IntentFilter(SyncWorker.ACTION_SYNC_COMPLETED)
-        )
-        
-        Logger.d(TAG, "📡 BroadcastReceiver registered (sync-completed)")
-        
-        // Reload notes (scroll to top wird in loadNotes() gemacht)
-        loadNotes()
-        
-        // Trigger Auto-Sync beim App-Wechsel in Vordergrund (Toast)
-        triggerAutoSync("onResume")
-    }
-    
-    /**
-     * Automatischer Sync (onResume)
-     * - Nutzt WiFi-gebundenen Socket (VPN Fix!)
-     * - Nur Success-Toast (kein "Auto-Sync..." Toast)
-     * 
-     * NOTE: WiFi-Connect Sync nutzt WorkManager (auch wenn App geschlossen!)
-     * v1.5.0: Silent-Sync - kein Banner während des Syncs, Fehler werden trotzdem angezeigt
-     */
-    private fun triggerAutoSync(source: String = "unknown") {
-        // Throttling: Max 1 Sync pro Minute
-        if (!canTriggerAutoSync()) {
-            return
-        }
-        
-        // 🔄 v1.3.1: Check if sync already running
-        // v1.5.0: silent=true - kein Banner bei Auto-Sync
-        if (!SyncStateManager.tryStartSync("auto-$source", silent = true)) {
-            Logger.d(TAG, "⏭️ Auto-sync ($source): Another sync already in progress")
-            return
-        }
-        
-        Logger.d(TAG, "🔄 Auto-sync triggered ($source)")
-        
-        // Update last sync timestamp
-        prefs.edit().putLong(PREF_LAST_AUTO_SYNC_TIME, System.currentTimeMillis()).apply()
-        
-        lifecycleScope.launch {
-            try {
-                val syncService = WebDavSyncService(this@MainActivity)
-                
-                // 🔥 v1.1.2: Check if there are unsynced changes first (performance optimization)
-                if (!syncService.hasUnsyncedChanges()) {
-                    Logger.d(TAG, "⏭️ Auto-sync ($source): No unsynced changes - skipping")
-                    SyncStateManager.reset()
-                    return@launch
-                }
-                
-                // ⭐ WICHTIG: Server-Erreichbarkeits-Check VOR Sync (wie in SyncWorker)
-                val isReachable = withContext(Dispatchers.IO) {
-                    syncService.isServerReachable()
-                }
-                
-                if (!isReachable) {
-                    Logger.d(TAG, "⏭️ Auto-sync ($source): Server not reachable - skipping silently")
-                    SyncStateManager.reset()
-                    return@launch
-                }
-                
-                // Server ist erreichbar → Sync durchführen
-                val result = withContext(Dispatchers.IO) {
-                    syncService.syncNotes()
-                }
-                
-                // Feedback abhängig von Source
-                if (result.isSuccess && result.syncedCount > 0) {
-                    Logger.d(TAG, "✅ Auto-sync successful ($source): ${result.syncedCount} notes")
-                    SyncStateManager.markCompleted("${result.syncedCount} Notizen")
-                    
-                    // onResume: Nur Success-Toast
-                    showToast("✅ Gesynct: ${result.syncedCount} Notizen")
-                    loadNotes()
-                    
-                } else if (result.isSuccess) {
-                    Logger.d(TAG, "ℹ️ Auto-sync ($source): No changes")
-                    SyncStateManager.markCompleted()
-                    
-                } else {
-                    Logger.e(TAG, "❌ Auto-sync failed ($source): ${result.errorMessage}")
-                    SyncStateManager.markError(result.errorMessage)
-                    // Kein Toast - App ist im Hintergrund
-                }
-                
-            } catch (e: Exception) {
-                Logger.e(TAG, "💥 Auto-sync exception ($source): ${e.message}")
-                SyncStateManager.markError(e.message)
-                // Kein Toast - App ist im Hintergrund
-            }
-        }
-    }
-    
-    /**
-     * Prüft ob Auto-Sync getriggert werden darf (Throttling)
-     */
-    private fun canTriggerAutoSync(): Boolean {
-        val lastSyncTime = prefs.getLong(PREF_LAST_AUTO_SYNC_TIME, 0)
-        val now = System.currentTimeMillis()
-        val timeSinceLastSync = now - lastSyncTime
-        
-        if (timeSinceLastSync < MIN_AUTO_SYNC_INTERVAL_MS) {
-            val remainingSeconds = (MIN_AUTO_SYNC_INTERVAL_MS - timeSinceLastSync) / 1000
-            Logger.d(TAG, "⏳ Auto-sync throttled - wait ${remainingSeconds}s")
-            return false
-        }
-        
-        return true
-    }
-    
-    override fun onPause() {
-        super.onPause()
-        
-        // Unregister BroadcastReceiver
-        LocalBroadcastManager.getInstance(this).unregisterReceiver(syncCompletedReceiver)
-        Logger.d(TAG, "📡 BroadcastReceiver unregistered")
-    }
-    
-    private fun findViews() {
-        recyclerViewNotes = findViewById(R.id.recyclerViewNotes)
-        emptyStateCard = findViewById(R.id.emptyStateCard)
-        fabAddNote = findViewById(R.id.fabAddNote)
-        toolbar = findViewById(R.id.toolbar)
-        swipeRefreshLayout = findViewById<SwipeRefreshLayout>(R.id.swipeRefreshLayout)
-        
-        // 🔄 v1.3.1: Sync Status Banner
-        syncStatusBanner = findViewById(R.id.syncStatusBanner)
-        syncStatusText = findViewById(R.id.syncStatusText)
-    }
-    
-    private fun setupToolbar() {
-        setSupportActionBar(toolbar)
-    }
-    
-    private fun setupRecyclerView() {
-        adapter = NotesAdapter { note ->
-            openNoteEditor(note.id)
-        }
-        recyclerViewNotes.adapter = adapter
-        recyclerViewNotes.layoutManager = LinearLayoutManager(this)
-        
-        // 🔥 v1.1.2: Setup Pull-to-Refresh
-        setupPullToRefresh()
-        
-        // Setup Swipe-to-Delete
-        setupSwipeToDelete()
-    }
-    
-    /**
-     * Setup Pull-to-Refresh für manuellen Sync (v1.1.2)
-     */
-    private fun setupPullToRefresh() {
-        swipeRefreshLayout.setOnRefreshListener {
-            Logger.d(TAG, "🔄 Pull-to-Refresh triggered - starting manual sync")
-            
-            // 🔄 v1.3.1: Check if sync already running (Banner zeigt Status)
-            if (!SyncStateManager.tryStartSync("pullToRefresh")) {
-                swipeRefreshLayout.isRefreshing = false
-                return@setOnRefreshListener
-            }
-            
-            lifecycleScope.launch {
-                try {
-                    val prefs = getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
-                    val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
-                    
-                    if (serverUrl.isNullOrEmpty()) {
-                        showToast("⚠️ Server noch nicht konfiguriert")
-                        SyncStateManager.reset()
-                        return@launch
-                    }
-                    
-                    val syncService = WebDavSyncService(this@MainActivity)
-                    
-                    // 🔥 v1.1.2: Check if there are unsynced changes first (performance optimization)
-                    if (!syncService.hasUnsyncedChanges()) {
-                        Logger.d(TAG, "⏭️ No unsynced changes, skipping server reachability check")
-                        SyncStateManager.markCompleted(getString(R.string.snackbar_already_synced))
-                        return@launch
-                    }
-                    
-                    // Check if server is reachable
-                    if (!syncService.isServerReachable()) {
-                        SyncStateManager.markError(getString(R.string.snackbar_server_unreachable))
-                        return@launch
-                    }
-                    
-                    // Perform sync
-                    val result = syncService.syncNotes()
-                    
-                    if (result.isSuccess) {
-                        SyncStateManager.markCompleted(getString(R.string.snackbar_synced_count, result.syncedCount))
-                        loadNotes()
-                    } else {
-                        SyncStateManager.markError(result.errorMessage)
-                    }
-                } catch (e: Exception) {
-                    Logger.e(TAG, "Pull-to-Refresh sync failed", e)
-                    SyncStateManager.markError(e.message)
-                }
-            }
-        }
-        
-        // Set Material 3 color scheme
-        swipeRefreshLayout.setColorSchemeResources(
-            com.google.android.material.R.color.material_dynamic_primary50
-        )
-    }
-    
-    private fun setupSwipeToDelete() {
-        val itemTouchHelper = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(
-            0, // No drag
-            ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT // Swipe left or right
-        ) {
-            override fun onMove(
-                recyclerView: RecyclerView,
-                viewHolder: RecyclerView.ViewHolder,
-                target: RecyclerView.ViewHolder
-            ): Boolean = false
-            
-            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
-                val position = viewHolder.bindingAdapterPosition
-                val swipedNote = adapter.currentList[position]
-                
-                // Store original list BEFORE removing note
-                val originalList = adapter.currentList.toList()
-                
-                // Remove from list for visual feedback (NOT from storage yet!)
-                val listWithoutNote = originalList.toMutableList().apply {
-                    removeAt(position)
-                }
-                adapter.submitList(listWithoutNote)
-                
-                // Show dialog with ability to restore
-                showServerDeletionDialog(swipedNote, originalList)
-            }
-            
-            override fun getSwipeThreshold(viewHolder: RecyclerView.ViewHolder): Float {
-                // Require 80% swipe to trigger
-                return 0.8f
-            }
-        })
-        
-        itemTouchHelper.attachToRecyclerView(recyclerViewNotes)
-    }
-    
-    private fun showServerDeletionDialog(note: Note, originalList: List<Note>) {
-        val alwaysDeleteFromServer = prefs.getBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, false)
-        
-        if (alwaysDeleteFromServer) {
-            // Auto-delete from server without asking
-            deleteNoteLocally(note, deleteFromServer = true)
-            return
-        }
-        
-        val dialogView = layoutInflater.inflate(R.layout.dialog_server_deletion, null)
-        val checkboxAlways = dialogView.findViewById<CheckBox>(R.id.checkboxAlwaysDeleteFromServer)
-        
-        MaterialAlertDialogBuilder(this)
-            .setTitle(getString(R.string.legacy_delete_dialog_title))
-            .setMessage(getString(R.string.legacy_delete_dialog_message, note.title))
-            .setView(dialogView)
-            .setNeutralButton(getString(R.string.cancel)) { _, _ ->
-                // RESTORE: Re-submit original list (note is NOT deleted from storage)
-                adapter.submitList(originalList)
-            }
-            .setOnCancelListener {
-                // User pressed back - also restore
-                adapter.submitList(originalList)
-            }
-            .setPositiveButton("Nur lokal") { _, _ ->
-                if (checkboxAlways.isChecked) {
-                    prefs.edit().putBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, false).apply()
-                }
-                // NOW actually delete from storage
-                deleteNoteLocally(note, deleteFromServer = false)
-            }
-            .setNegativeButton(getString(R.string.legacy_delete_from_server)) { _, _ ->
-                if (checkboxAlways.isChecked) {
-                    prefs.edit().putBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, true).apply()
-                }
-                deleteNoteLocally(note, deleteFromServer = true)
-            }
-            .setCancelable(true)
-            .show()
-    }
-    
-    private fun deleteNoteLocally(note: Note, deleteFromServer: Boolean) {
-        // Track pending deletion to prevent flicker
-        pendingDeletions.add(note.id)
-        
-        // Delete from storage
-        storage.deleteNote(note.id)
-        
-        // Reload to reflect changes
-        loadNotes()
-        
-        // Show Snackbar with UNDO option
-        val message = if (deleteFromServer) {
-            getString(R.string.legacy_delete_with_server, note.title)
-        } else {
-            getString(R.string.legacy_delete_local_only, note.title)
-        }
-        
-        Snackbar.make(recyclerViewNotes, message, Snackbar.LENGTH_LONG)
-            .setAction(getString(R.string.snackbar_undo)) {
-                // UNDO: Restore note
-                storage.saveNote(note)
-                pendingDeletions.remove(note.id)
-                loadNotes()
-            }
-            .addCallback(object : Snackbar.Callback() {
-                override fun onDismissed(transientBottomBar: Snackbar?, event: Int) {
-                    if (event != DISMISS_EVENT_ACTION) {
-                        // Snackbar dismissed without UNDO
-                        pendingDeletions.remove(note.id)
-                        
-                        // Delete from server if requested
-                        if (deleteFromServer) {
-                            lifecycleScope.launch {
-                                try {
-                                    val webdavService = WebDavSyncService(this@MainActivity)
-                                    val success = webdavService.deleteNoteFromServer(note.id)
-                                    if (success) {
-                                        runOnUiThread {
-                                            Toast.makeText(
-                                                this@MainActivity,
-                                                getString(R.string.snackbar_deleted_from_server),
-                                                Toast.LENGTH_SHORT
-                                            ).show()
-                                        }
-                                    } else {
-                                        runOnUiThread {
-                                            Toast.makeText(
-                                                this@MainActivity,
-                                                getString(R.string.snackbar_server_delete_failed),
-                                                Toast.LENGTH_LONG
-                                            ).show()
-                                        }
-                                    }
-                                } catch (e: Exception) {
-                                    runOnUiThread {
-                                        Toast.makeText(
-                                            this@MainActivity,
-                                            "Server-Fehler: ${e.message}",
-                                            Toast.LENGTH_LONG
-                                        ).show()
-                                    }
-                                }
-                            }
-                        }
-                    }
-                }
-            }).show()
-    }
-    
-    /**
-     * v1.4.0: Setup FAB mit Dropdown für Notiz-Typ Auswahl
-     */
-    private fun setupFab() {
-        fabAddNote.setOnClickListener { view ->
-            showNoteTypePopup(view)
-        }
-    }
-    
-    /**
-     * v1.4.0: Zeigt Popup-Menü zur Auswahl des Notiz-Typs
-     */
-    private fun showNoteTypePopup(anchor: View) {
-        val popupMenu = PopupMenu(this, anchor, Gravity.END)
-        popupMenu.inflate(R.menu.menu_fab_note_types)
-        
-        // Icons im Popup anzeigen (via Reflection, da standardmäßig ausgeblendet)
-        try {
-            val fields = popupMenu.javaClass.declaredFields
-            for (field in fields) {
-                if ("mPopup" == field.name) {
-                    field.isAccessible = true
-                    val menuPopupHelper = field.get(popupMenu)
-                    val classPopupHelper = Class.forName(menuPopupHelper.javaClass.name)
-                    val setForceIcons = classPopupHelper.getMethod("setForceShowIcon", Boolean::class.java)
-                    setForceIcons.invoke(menuPopupHelper, true)
-                    break
-                }
-            }
-        } catch (e: Exception) {
-            Logger.w(TAG, "Could not force show icons in popup menu: ${e.message}")
-        }
-        
-        popupMenu.setOnMenuItemClickListener { menuItem ->
-            val noteType = when (menuItem.itemId) {
-                R.id.action_create_text_note -> NoteType.TEXT
-                R.id.action_create_checklist -> NoteType.CHECKLIST
-                else -> return@setOnMenuItemClickListener false
-            }
-            
-            val intent = Intent(this, NoteEditorActivity::class.java)
-            intent.putExtra(NoteEditorActivity.EXTRA_NOTE_TYPE, noteType.name)
-            startActivity(intent)
-            true
-        }
-        
-        popupMenu.show()
-    }
-    
-    private fun loadNotes() {
-        val notes = storage.loadAllNotes()
-        
-        // Filter out notes that are pending deletion (prevent flicker)
-        val filteredNotes = notes.filter { it.id !in pendingDeletions }
-        
-        // Submit list with callback to scroll to top after list is updated
-        adapter.submitList(filteredNotes) {
-            // Scroll to top after list update is complete
-            // Wichtig: Nach dem Erstellen/Bearbeiten einer Notiz
-            if (filteredNotes.isNotEmpty()) {
-                recyclerViewNotes.scrollToPosition(0)
-            }
-        }
-        
-        // Material 3 Empty State Card
-        emptyStateCard.visibility = if (filteredNotes.isEmpty()) {
-            android.view.View.VISIBLE
-        } else {
-            android.view.View.GONE
-        }
-    }
-    
-    private fun openNoteEditor(noteId: String?) {
-        val intent = Intent(this, NoteEditorActivity::class.java)
-        noteId?.let {
-            intent.putExtra(NoteEditorActivity.EXTRA_NOTE_ID, it)
-        }
-        startActivity(intent)
-    }
-    
-    private fun openSettings() {
-        // v1.5.0: Use new Jetpack Compose Settings
-        val intent = Intent(this, dev.dettmer.simplenotes.ui.settings.ComposeSettingsActivity::class.java)
-        @Suppress("DEPRECATION")
-        startActivityForResult(intent, REQUEST_SETTINGS)
-    }
-    
-    private fun triggerManualSync() {
-        // 🔄 v1.3.1: Check if sync already running (Banner zeigt Status)
-        if (!SyncStateManager.tryStartSync("manual")) {
-            return
-        }
-        
-        lifecycleScope.launch {
-            try {
-                // Create sync service
-                val syncService = WebDavSyncService(this@MainActivity)
-                
-                // 🔥 v1.1.2: Check if there are unsynced changes first (performance optimization)
-                if (!syncService.hasUnsyncedChanges()) {
-                    Logger.d(TAG, "⏭️ Manual Sync: No unsynced changes - skipping")
-                    val message = getString(R.string.toast_already_synced)
-                    SyncStateManager.markCompleted(message)
-                    return@launch
-                }
-                
-                // ⭐ WICHTIG: Server-Erreichbarkeits-Check VOR Sync (wie in SyncWorker)
-                val isReachable = withContext(Dispatchers.IO) {
-                    syncService.isServerReachable()
-                }
-                
-                if (!isReachable) {
-                    Logger.d(TAG, "⏭️ Manual Sync: Server not reachable - aborting")
-                    SyncStateManager.markError(getString(R.string.snackbar_server_unreachable))
-                    return@launch
-                }
-                
-                // Server ist erreichbar → Sync durchführen
-                val result = withContext(Dispatchers.IO) {
-                    syncService.syncNotes()
-                }
-                
-                // Show result
-                if (result.isSuccess) {
-                    SyncStateManager.markCompleted("${result.syncedCount} Notizen")
-                    loadNotes() // Reload notes
-                } else {
-                    SyncStateManager.markError(result.errorMessage)
-                }
-                
-            } catch (e: Exception) {
-                SyncStateManager.markError(e.message)
-            }
-        }
-    }
-    
-    override fun onCreateOptionsMenu(menu: Menu): Boolean {
-        menuInflater.inflate(R.menu.menu_main, menu)
-        optionsMenu = menu  // 🔄 v1.3.1: Store reference for sync button state
-        return true
-    }
-    
-    override fun onOptionsItemSelected(item: MenuItem): Boolean {
-        return when (item.itemId) {
-            R.id.action_settings -> {
-                openSettings()
-                true
-            }
-            R.id.action_sync -> {
-                triggerManualSync()
-                true
-            }
-            else -> super.onOptionsItemSelected(item)
-        }
-    }
-    
-    private fun requestNotificationPermission() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-            if (checkSelfPermission(Manifest.permission.POST_NOTIFICATIONS) 
-                != PackageManager.PERMISSION_GRANTED) {
-                requestPermissions(
-                    arrayOf(Manifest.permission.POST_NOTIFICATIONS),
-                    REQUEST_NOTIFICATION_PERMISSION
-                )
-            }
-        }
-    }
-    
-    @Deprecated("Deprecated in Java")
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        super.onActivityResult(requestCode, resultCode, data)
-        
-        if (requestCode == REQUEST_SETTINGS && resultCode == RESULT_OK) {
-            // Restore was successful, reload notes
-            loadNotes()
-        }
-    }
-    
-    /**
-     * v1.4.1: Migriert bestehende Checklisten für Abwärtskompatibilität.
-     * 
-     * Problem: v1.4.0 Checklisten haben leeren "content", was auf älteren
-     * App-Versionen (v1.3.x) als leere Notiz angezeigt wird.
-     * 
-     * Lösung: Alle Checklisten ohne Fallback-Content als PENDING markieren,
-     * damit sie beim nächsten Sync mit Fallback-Content hochgeladen werden.
-     * 
-     * TODO: Diese Migration kann entfernt werden, sobald v1.4.0 nicht mehr
-     * im Umlauf ist (ca. 6 Monate nach v1.4.1 Release, also ~Juli 2026).
-     * Tracking: https://github.com/inventory69/simple-notes-sync/issues/XXX
-     */
-    private fun migrateChecklistsForBackwardsCompat() {
-        val migrationKey = "v1.4.1_checklist_migration_done"
-        
-        // Nur einmal ausführen
-        if (prefs.getBoolean(migrationKey, false)) {
-            return
-        }
-        
-        val allNotes = storage.loadAllNotes()
-        val checklistsToMigrate = allNotes.filter { note ->
-            note.noteType == NoteType.CHECKLIST && 
-            note.content.isBlank() &&
-            note.checklistItems?.isNotEmpty() == true
-        }
-        
-        if (checklistsToMigrate.isNotEmpty()) {
-            Logger.d(TAG, "🔄 v1.4.1 Migration: Found ${checklistsToMigrate.size} checklists without fallback content")
-            
-            for (note in checklistsToMigrate) {
-                // Als PENDING markieren, damit beim nächsten Sync der Fallback-Content 
-                // generiert und hochgeladen wird
-                val updatedNote = note.copy(
-                    syncStatus = dev.dettmer.simplenotes.models.SyncStatus.PENDING
-                )
-                storage.saveNote(updatedNote)
-                Logger.d(TAG, "   📝 Marked for re-sync: ${note.title}")
-            }
-            
-            Logger.d(TAG, "✅ v1.4.1 Migration: ${checklistsToMigrate.size} checklists marked for re-sync")
-        }
-        
-        // Migration als erledigt markieren
-        prefs.edit().putBoolean(migrationKey, true).apply()
-    }
-    
-    override fun onRequestPermissionsResult(
-        requestCode: Int,
-        permissions: Array<out String>,
-        grantResults: IntArray
-    ) {
-        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
-        
-        when (requestCode) {
-            REQUEST_NOTIFICATION_PERMISSION -> {
-                if (grantResults.isNotEmpty() && 
-                    grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    showToast(getString(R.string.toast_notifications_enabled))
-                } else {
-                    showToast(getString(R.string.toast_notifications_disabled))
-                }
-            }
-        }
-    }
-    
-    /**
-     * 🌍 v1.7.2: Debug-Logging für Locale-Problem
-     * Hilft zu identifizieren warum deutsche Strings trotz englischer App angezeigt werden
-     */
-    private fun logLocaleInfo() {
-        if (!BuildConfig.DEBUG) return
-        
-        Logger.d(TAG, "╔═══════════════════════════════════════════════════")
-        Logger.d(TAG, "║ 🌍 LOCALE DEBUG INFO")
-        Logger.d(TAG, "╠═══════════════════════════════════════════════════")
-        
-        // System Locale
-        val systemLocale = java.util.Locale.getDefault()
-        Logger.d(TAG, "║ System Locale (Locale.getDefault()): $systemLocale")
-        
-        // Resources Locale
-        val resourcesLocale = resources.configuration.locales[0]
-        Logger.d(TAG, "║ Resources Locale: $resourcesLocale")
-        
-        // Context Locale (API 24+)
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-            val contextLocales = resources.configuration.locales
-            Logger.d(TAG, "║ Context Locales (all): $contextLocales")
-        }
-        
-        // Test String Loading
-        val testString = getString(R.string.toast_already_synced)
-        Logger.d(TAG, "║ Test: getString(R.string.toast_already_synced)")
-        Logger.d(TAG, "║ Result: '$testString'")
-        Logger.d(TAG, "║ Expected EN: '✅ Already synced'")
-        Logger.d(TAG, "║ Is German?: ${testString.contains("Bereits") || testString.contains("synchronisiert")}")
-        
-        Logger.d(TAG, "╚═══════════════════════════════════════════════════")
-    }
-}

android/app/src/main/java/dev/dettmer/simplenotes/NoteEditorActivity.kt

@@ -7,6 +7,7 @@ import android.view.View
 import android.widget.LinearLayout
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -24,6 +25,9 @@ import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.utils.DeviceIdGenerator
 import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.utils.showToast
+import kotlinx.coroutines.launch
+import org.koin.android.ext.android.inject
+import org.koin.java.KoinJavaComponent
 
 /**
  * Editor Activity für Notizen und Checklisten
@@ -42,8 +46,6 @@ class NoteEditorActivity : AppCompatActivity() {
     private lateinit var rvChecklistItems: RecyclerView
     private lateinit var btnAddItem: MaterialButton
 
-    private lateinit var storage: NotesStorage
-    
     // State
     private var existingNote: Note? = null
     private var currentNoteType: NoteType = NoteType.TEXT
@@ -57,6 +59,8 @@ class NoteEditorActivity : AppCompatActivity() {
         const val EXTRA_NOTE_TYPE = "extra_note_type"
     }
 
+    private val storage: NotesStorage by KoinJavaComponent.inject(NotesStorage::class.java)
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -65,8 +69,6 @@ class NoteEditorActivity : AppCompatActivity() {
 
         setContentView(R.layout.activity_editor)
 
-        storage = NotesStorage(this)
-        
         findViews()
         setupToolbar()
         loadNoteOrDetermineType()
@@ -93,6 +95,8 @@ class NoteEditorActivity : AppCompatActivity() {
         val noteId = intent.getStringExtra(EXTRA_NOTE_ID)
 
         if (noteId != null) {
+
+            lifecycleScope.launch {
                 // Existierende Notiz laden
                 existingNote = storage.loadNote(noteId)
                 existingNote?.let { note ->
@@ -113,6 +117,7 @@ class NoteEditorActivity : AppCompatActivity() {
                         }
                     }
                 }
+            }
         } else {
             // Neue Notiz - Typ aus Intent
             val typeString = intent.getStringExtra(EXTRA_NOTE_TYPE) ?: NoteType.TEXT.name
@@ -286,7 +291,7 @@ class NoteEditorActivity : AppCompatActivity() {
                     )
                 }
 
-                storage.saveNote(note)
+                lifecycleScope.launch { storage.saveNote(note) }
             }
 
             NoteType.CHECKLIST -> {
@@ -323,7 +328,7 @@ class NoteEditorActivity : AppCompatActivity() {
                     )
                 }
 
-                storage.saveNote(note)
+                lifecycleScope.launch { storage.saveNote(note) }
             }
         }
 
@@ -344,7 +349,7 @@ class NoteEditorActivity : AppCompatActivity() {
 
     private fun deleteNote() {
         existingNote?.let {
-            storage.deleteNote(it.id)
+            lifecycleScope.launch { storage.deleteNote(it.id) }
             showToast(getString(R.string.note_deleted))
             finish()
         }

android/app/src/main/java/dev/dettmer/simplenotes/SettingsActivity.kt

@@ -6,6 +6,7 @@ import android.annotation.SuppressLint
 import android.app.ProgressDialog
 import android.content.Context
 import android.content.Intent
+import android.content.SharedPreferences
 import android.net.Uri
 import android.os.Bundle
 import android.os.PowerManager
@@ -32,6 +33,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import dev.dettmer.simplenotes.backup.BackupManager
 import dev.dettmer.simplenotes.backup.RestoreMode
+import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.utils.UrlValidator
 import kotlinx.coroutines.withContext
 import dev.dettmer.simplenotes.sync.WebDavSyncService
@@ -40,10 +42,12 @@ import dev.dettmer.simplenotes.sync.NetworkMonitor
 import dev.dettmer.simplenotes.utils.Constants
 import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.utils.showToast
+import org.koin.java.KoinJavaComponent.inject
 import java.net.HttpURLConnection
 import java.net.URL
 import java.text.SimpleDateFormat
 import java.util.Locale
+import kotlin.getValue
 
 @Suppress("LargeClass", "DEPRECATION") // Legacy code using ProgressDialog & LocalBroadcastManager, will be removed in v2.0.0
 class SettingsActivity : AppCompatActivity() {
@@ -107,9 +111,8 @@ class SettingsActivity : AppCompatActivity() {
         uri?.let { showRestoreDialog(RestoreSource.LOCAL_FILE, it) }
     }
 
-    private val prefs by lazy {
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
-        getSharedPreferences(Constants.PREFS_NAME, MODE_PRIVATE)
+    private val prefs: SharedPreferences by inject(SharedPreferences::class.java)
-    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -700,8 +703,8 @@ class SettingsActivity : AppCompatActivity() {
             // Initial-Export wenn Feature aktiviert wird
             lifecycleScope.launch {
                 try {
-                    val noteStorage = dev.dettmer.simplenotes.storage.NotesStorage(this@SettingsActivity)
+
-                    val currentNoteCount = noteStorage.loadAllNotes().size
+                    val currentNoteCount = storage.loadAllNotes().size
 
                     if (currentNoteCount > 0) {
                         // Zeige Progress-Dialog

android/app/src/main/java/dev/dettmer/simplenotes/SimpleNotesApplication.kt

@@ -6,6 +6,10 @@ import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.sync.NetworkMonitor
 import dev.dettmer.simplenotes.utils.NotificationHelper
 import dev.dettmer.simplenotes.utils.Constants
+import dev.dettmer.simplenotes.di.appModule
+import org.koin.android.ext.koin.androidContext
+import org.koin.android.ext.koin.androidLogger
+import org.koin.core.context.startKoin
 
 class SimpleNotesApplication : Application() {
 
@@ -30,6 +34,12 @@ class SimpleNotesApplication : Application() {
     override fun onCreate() {
         super.onCreate()
 
+        startKoin {
+            androidLogger() // Log Koin events
+            androidContext(this@SimpleNotesApplication) // Provide context to modules
+            modules(appModule)
+        }
+
         val prefs = getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
 
         // 🔧 Hotfix v1.6.2: Migrate offline mode setting BEFORE any ViewModel initialization

android/app/src/main/java/dev/dettmer/simplenotes/backup/BackupManager.kt

@@ -11,9 +11,12 @@ import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.utils.Logger
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import org.koin.core.component.KoinComponent
+import org.koin.java.KoinJavaComponent.inject
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.*
+import kotlin.getValue
 
 /**
  * BackupManager: Lokale Backup & Restore Funktionalität
@@ -24,7 +27,7 @@ import java.util.*
  * - Auto-Backup vor Restore (Sicherheitsnetz)
  * - Backup-Validierung
  */
-class BackupManager(private val context: Context) {
+class BackupManager(private val context: Context): KoinComponent {
 
     companion object {
         private const val TAG = "BackupManager"
@@ -34,7 +37,7 @@ class BackupManager(private val context: Context) {
         private const val MAGIC_BYTES_LENGTH = 4  // v1.7.0: For encryption check
     }
 
-    private val storage = NotesStorage(context)
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
     private val gson: Gson = GsonBuilder().setPrettyPrinting().create()
     private val encryptionManager = EncryptionManager()  // 🔐 v1.7.0
 
@@ -275,7 +278,7 @@ class BackupManager(private val context: Context) {
      * Restore-Modus: MERGE
      * Fügt neue Notizen hinzu, behält bestehende
      */
-    private fun restoreMerge(backupNotes: List<Note>): RestoreResult {
+    private suspend fun restoreMerge(backupNotes: List<Note>): RestoreResult {
         val existingNotes = storage.loadAllNotes()
         val existingIds = existingNotes.map { it.id }.toSet()
 
@@ -298,7 +301,7 @@ class BackupManager(private val context: Context) {
      * Restore-Modus: REPLACE
      * Löscht alle bestehenden Notizen, importiert Backup
      */
-    private fun restoreReplace(backupNotes: List<Note>): RestoreResult {
+    private suspend fun restoreReplace(backupNotes: List<Note>): RestoreResult {
         // Alle bestehenden Notizen löschen
         storage.deleteAllNotes()
 
@@ -319,7 +322,7 @@ class BackupManager(private val context: Context) {
      * Restore-Modus: OVERWRITE_DUPLICATES
      * Backup überschreibt bei ID-Konflikten
      */
-    private fun restoreOverwriteDuplicates(backupNotes: List<Note>): RestoreResult {
+    private suspend fun restoreOverwriteDuplicates(backupNotes: List<Note>): RestoreResult {
         val existingNotes = storage.loadAllNotes()
         val existingIds = existingNotes.map { it.id }.toSet()
 

android/app/src/main/java/dev/dettmer/simplenotes/di/AppModule.kt

@@ -0,0 +1,36 @@
+package dev.dettmer.simplenotes.di
+
+import android.content.Context
+import androidx.room.Room
+import dev.dettmer.simplenotes.storage.AppDatabase
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.ui.main.MainViewModel
+import dev.dettmer.simplenotes.utils.Constants
+import org.koin.android.ext.koin.androidApplication
+import org.koin.android.ext.koin.androidContext
+import org.koin.androidx.viewmodel.dsl.viewModel
+import org.koin.dsl.module
+
+val appModule = module {
+    single {
+        Room.databaseBuilder(
+            androidContext(),
+            AppDatabase::class.java,
+            "notes_database"
+        ).build()
+    }
+
+    single { get<AppDatabase>().noteDao() }
+    single { get<AppDatabase>().deletedNoteDao() }
+
+    single { NotesStorage(androidContext(), get(), get()) }
+
+    // Provide SharedPreferences
+    single {
+        androidContext().getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    }
+
+
+
+    viewModel { MainViewModel(androidApplication()) }
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/AppDatabase.kt

@@ -0,0 +1,19 @@
+package dev.dettmer.simplenotes.storage
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.room.TypeConverters
+import dev.dettmer.simplenotes.storage.converter.NoteConverters
+import dev.dettmer.simplenotes.storage.dao.DeletedNoteDao
+import dev.dettmer.simplenotes.storage.dao.NoteDao
+import dev.dettmer.simplenotes.storage.entity.DeletedNoteEntity
+import dev.dettmer.simplenotes.storage.entity.NoteEntity
+
+@Database(entities = [NoteEntity::class, DeletedNoteEntity::class], version = 1)
+@TypeConverters(NoteConverters::class)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun noteDao(): NoteDao
+    abstract fun deletedNoteDao(): DeletedNoteDao
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/NotesStorage.kt

@@ -3,73 +3,97 @@ package dev.dettmer.simplenotes.storage
 import android.content.Context
 import dev.dettmer.simplenotes.models.DeletionTracker
 import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.storage.dao.DeletedNoteDao
+import dev.dettmer.simplenotes.storage.dao.NoteDao
+import dev.dettmer.simplenotes.storage.entity.DeletedNoteEntity
+import dev.dettmer.simplenotes.storage.entity.NoteEntity
 import dev.dettmer.simplenotes.utils.DeviceIdGenerator
 import dev.dettmer.simplenotes.utils.Logger
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.sync.withLock
 import java.io.File
 
-class NotesStorage(private val context: Context) {
+class NotesStorage(
+    private val context: Context,
+    private val noteDao: NoteDao,
+    private val deletedNoteDao: DeletedNoteDao,
+) {
 
     companion object {
         private const val TAG = "NotesStorage"
-        // 🔒 v1.7.2 (IMPL_001): Mutex für thread-sichere Deletion Tracker Operationen
-        private val deletionTrackerMutex = Mutex()
     }
 
-    private val notesDir: File = File(context.filesDir, "notes").apply {
+
-        if (!exists()) mkdirs()
+    suspend fun saveNote(note: Note) {
+        noteDao.saveNote(
+            NoteEntity(
+                id = note.id,
+                title = note.title,
+                content = note.content,
+                createdAt = note.createdAt,
+                updatedAt = note.updatedAt,
+                deviceId = note.deviceId,
+                syncStatus = note.syncStatus,
+                noteType = note.noteType,
+                checklistItems = note.checklistItems,
+                checklistSortOption = note.checklistSortOption
+            )
+        )
     }
 
-    fun saveNote(note: Note) {
+    suspend fun loadNote(id: String): Note? {
-        val file = File(notesDir, "${note.id}.json")
+        return noteDao.getNote(id)?.let { note ->
-        file.writeText(note.toJson())
+            Note(
-    }
+                id = note.id,
-    
+                title = note.title,
-    fun loadNote(id: String): Note? {
+                content = note.content,
-        val file = File(notesDir, "$id.json")
+                createdAt = note.createdAt,
-        return if (file.exists()) {
+                updatedAt = note.updatedAt,
-            Note.fromJson(file.readText())
+                deviceId = note.deviceId,
-        } else {
+                syncStatus = note.syncStatus,
-            null
+                noteType = note.noteType,
+                checklistItems = note.checklistItems,
+                checklistSortOption = note.checklistSortOption
+            )
         }
     }
 
-    /**
+    suspend fun loadAllNotes(): List<Note> {
-     * Lädt alle Notizen aus dem lokalen Speicher.
+        return noteDao.getAllNotes().map { note ->
-     * 
+            Note(
-     * 🔀 v1.8.0: Sortierung entfernt — wird jetzt im ViewModel durchgeführt,
+                id = note.id,
-     * damit der User die Sortierung konfigurieren kann.
+                title = note.title,
-     */
+                content = note.content,
-    fun loadAllNotes(): List<Note> {
+                createdAt = note.createdAt,
-        return notesDir.listFiles()
+                updatedAt = note.updatedAt,
-            ?.filter { it.extension == "json" }
+                deviceId = note.deviceId,
-            ?.mapNotNull { Note.fromJson(it.readText()) }
+                syncStatus = note.syncStatus,
-            ?: emptyList()
+                noteType = note.noteType,
+                checklistItems = note.checklistItems,
+                checklistSortOption = note.checklistSortOption
+            )
+        }
     }
 
-    fun deleteNote(id: String): Boolean {
+    suspend fun deleteNote(id: String): Boolean {
-        val file = File(notesDir, "$id.json")
+        val deleted = noteDao.deleteNoteById(id) > 0
-        val deleted = file.delete()
 
         if (deleted) {
-            Logger.d(TAG, "🗑️ Deleted note: $id")
-            
-            // Track deletion to prevent zombie notes
             val deviceId = DeviceIdGenerator.getDeviceId(context)
-            trackDeletion(id, deviceId)
+            deletedNoteDao.trackDeletion(DeletedNoteEntity(id, deviceId))
         }
 
         return deleted
     }
 
-    fun deleteAllNotes(): Boolean {
+    suspend fun deleteAllNotes(): Boolean {
         return try {
-            val notes = loadAllNotes()
+            val notes = noteDao.getAllNotes()
-            val deviceId = DeviceIdGenerator.getDeviceId(context)
+
+            noteDao.deleteAllNotes()
 
             for (note in notes) {
-                deleteNote(note.id)  // Uses trackDeletion() automatically
+                val deviceId = DeviceIdGenerator.getDeviceId(context)
+                deletedNoteDao.trackDeletion(DeletedNoteEntity(note.id, deviceId))
             }
 
             Logger.d(TAG, "🗑️ Deleted all notes (${notes.size} notes)")
@@ -126,12 +150,7 @@ class NotesStorage(private val context: Context) {
      * @param deviceId Geräte-ID für Konflikt-Erkennung
      */
     suspend fun trackDeletionSafe(noteId: String, deviceId: String) {
-        deletionTrackerMutex.withLock {
+        deletedNoteDao.trackDeletion(DeletedNoteEntity(noteId, deviceId))
-            val tracker = loadDeletionTracker()
-            tracker.addDeletion(noteId, deviceId)
-            saveDeletionTracker(tracker)
-            Logger.d(TAG, "📝 Tracked deletion (mutex-protected): $noteId")
-        }
     }
 
     /**
@@ -140,20 +159,18 @@ class NotesStorage(private val context: Context) {
      *
      * @deprecated Verwende trackDeletionSafe() für Thread-Safety wo möglich
      */
-    fun trackDeletion(noteId: String, deviceId: String) {
+    suspend fun trackDeletion(noteId: String, deviceId: String) {
-        val tracker = loadDeletionTracker()
+        deletedNoteDao.trackDeletion(DeletedNoteEntity(noteId, deviceId))
-        tracker.addDeletion(noteId, deviceId)
-        saveDeletionTracker(tracker)
         Logger.d(TAG, "📝 Tracked deletion: $noteId")
     }
 
-    fun isNoteDeleted(noteId: String): Boolean {
+    suspend fun isNoteDeleted(noteId: String): Boolean {
-        val tracker = loadDeletionTracker()
+        return deletedNoteDao.isNoteDeleted(noteId)
-        return tracker.isDeleted(noteId)
     }
 
-    fun clearDeletionTracker() {
+    suspend fun clearDeletionTracker() {
-        saveDeletionTracker(DeletionTracker())
+        deletedNoteDao.clearTracker()
+
         Logger.d(TAG, "🗑️ Deletion tracker cleared")
     }
 
@@ -161,22 +178,10 @@ class NotesStorage(private val context: Context) {
      * 🔄 v1.7.0: Reset all sync statuses to PENDING when server changes
      * This ensures notes are uploaded to the new server on next sync
      */
-    fun resetAllSyncStatusToPending(): Int {
+    suspend fun resetAllSyncStatusToPending(): Int {
-        val notes = loadAllNotes()
+        var updatedCount = noteDao.updateSyncStatus(SyncStatus.SYNCED, SyncStatus.PENDING)
-        var updatedCount = 0
-        
-        notes.forEach { note ->
-            if (note.syncStatus == dev.dettmer.simplenotes.models.SyncStatus.SYNCED) {
-                val updatedNote = note.copy(syncStatus = dev.dettmer.simplenotes.models.SyncStatus.PENDING)
-                saveNote(updatedNote)
-                updatedCount++
-            }
-        }
 
         Logger.d(TAG, "🔄 Reset sync status for $updatedCount notes to PENDING")
         return updatedCount
     }
-
-    
-    fun getNotesDir(): File = notesDir
 }

android/app/src/main/java/dev/dettmer/simplenotes/storage/converter/NoteConverters.kt

@@ -0,0 +1,39 @@
+package dev.dettmer.simplenotes.storage.converter
+
+import androidx.room.TypeConverter
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import dev.dettmer.simplenotes.models.ChecklistItem
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+
+class NoteConverters {
+    private val gson = Gson()
+
+    // --- NoteType Enum ---
+    @TypeConverter
+    fun fromNoteType(value: NoteType): String = value.name
+
+    @TypeConverter
+    fun toNoteType(value: String): NoteType = NoteType.valueOf(value)
+
+    // --- SyncStatus Enum ---
+    @TypeConverter
+    fun fromSyncStatus(value: SyncStatus): String = value.name
+
+    @TypeConverter
+    fun toSyncStatus(value: String): SyncStatus = SyncStatus.valueOf(value)
+
+    // --- ChecklistItem List ---
+    @TypeConverter
+    fun fromChecklistItems(items: List<ChecklistItem>?): String? {
+        return items?.let { gson.toJson(it) }
+    }
+
+    @TypeConverter
+    fun toChecklistItems(json: String?): List<ChecklistItem>? {
+        if (json == null) return null
+        val type = object : TypeToken<List<ChecklistItem>>() {}.type
+        return gson.fromJson(json, type)
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/dao/DeletedNoteDao.kt

@@ -0,0 +1,19 @@
+package dev.dettmer.simplenotes.storage.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import dev.dettmer.simplenotes.storage.entity.DeletedNoteEntity
+
+@Dao
+interface DeletedNoteDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun trackDeletion(deletedNote: DeletedNoteEntity)
+
+    @Query("SELECT EXISTS(SELECT 1 FROM deleted_notes WHERE noteId = :noteId)")
+    suspend fun isNoteDeleted(noteId: String): Boolean
+
+    @Query("DELETE FROM deleted_notes")
+    suspend fun clearTracker()
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/dao/NoteDao.kt

@@ -0,0 +1,29 @@
+package dev.dettmer.simplenotes.storage.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.storage.entity.NoteEntity
+
+@Dao
+interface NoteDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun saveNote(note: NoteEntity)
+
+    @Query("SELECT * FROM notes WHERE id = :id")
+    suspend fun getNote(id: String): NoteEntity?
+
+    @Query("SELECT * FROM notes")
+    suspend fun getAllNotes(): List<NoteEntity>
+
+    @Query("DELETE FROM notes WHERE id = :id")
+    suspend fun deleteNoteById(id: String): Int
+
+    @Query("DELETE FROM notes")
+    suspend fun deleteAllNotes(): Int
+
+    @Query("UPDATE notes SET syncStatus = :newStatus WHERE syncStatus = :oldStatus")
+    suspend fun updateSyncStatus(oldStatus: SyncStatus, newStatus: SyncStatus): Int
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/entity/DeletedNoteEntity.kt

@@ -0,0 +1,11 @@
+package dev.dettmer.simplenotes.storage.entity
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "deleted_notes")
+data class DeletedNoteEntity(
+    @PrimaryKey val noteId: String,
+    val deviceId: String,
+    val deletedAt: Long = System.currentTimeMillis()
+)

android/app/src/main/java/dev/dettmer/simplenotes/storage/entity/NoteEntity.kt

@@ -0,0 +1,22 @@
+package dev.dettmer.simplenotes.storage.entity
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import dev.dettmer.simplenotes.models.ChecklistItem
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+
+@Entity(tableName = "notes")
+data class NoteEntity(
+    @PrimaryKey
+    val id: String,
+    val title: String,
+    val content: String,
+    val createdAt: Long,
+    val updatedAt: Long,
+    val deviceId: String,
+    val syncStatus: SyncStatus,
+    val noteType: NoteType,
+    val checklistItems: List<ChecklistItem>?, // Handled by TypeConverter
+    val checklistSortOption: String?
+)

android/app/src/main/java/dev/dettmer/simplenotes/sync/WebDavSyncService.kt

@@ -1,6 +1,7 @@
 package dev.dettmer.simplenotes.sync
 
 import android.content.Context
+import android.content.SharedPreferences
 import android.net.ConnectivityManager
 import android.net.NetworkCapabilities
 import com.thegrizzlylabs.sardineandroid.Sardine
@@ -21,6 +22,7 @@ import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.withContext
 import okhttp3.OkHttpClient
+import org.koin.java.KoinJavaComponent.inject
 import java.net.InetSocketAddress
 import java.net.NetworkInterface
 import java.net.Socket
@@ -50,8 +52,8 @@ class WebDavSyncService(private val context: Context) {
         private val syncMutex = Mutex()
     }
 
-    private val storage: NotesStorage
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
-    private val prefs = context.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    private val prefs: SharedPreferences by inject(SharedPreferences::class.java)
     private var markdownDirEnsured = false  // Cache für Ordner-Existenz
     private var notesDirEnsured = false     // ⚡ v1.3.1: Cache für /notes/ Ordner-Existenz
 
@@ -70,10 +72,9 @@ class WebDavSyncService(private val context: Context) {
             if (BuildConfig.DEBUG) {
                 Logger.d(TAG, "    Creating NotesStorage...")
             }
-            storage = NotesStorage(context)
+
             if (BuildConfig.DEBUG) {
                 Logger.d(TAG, "    ✅ NotesStorage created successfully")
-                Logger.d(TAG, "    Notes dir: ${storage.getNotesDir()}")
             }
         } catch (e: Exception) {
             Logger.e(TAG, "💥 CRASH in NotesStorage creation!", e)
@@ -403,7 +404,6 @@ class WebDavSyncService(private val context: Context) {
             }
 
             // Check 2: Local changes
-            val storage = NotesStorage(context)
             val allNotes = storage.loadAllNotes()
             val hasLocalChanges = allNotes.any { note ->
                 note.updatedAt > lastSyncTime
@@ -823,7 +823,7 @@ class WebDavSyncService(private val context: Context) {
 
     @Suppress("NestedBlockDepth", "LoopWithTooManyJumpStatements")
     // Sync logic requires nested conditions for comprehensive error handling and state management
-    private fun uploadLocalNotes(
+    private suspend fun uploadLocalNotes(
         sardine: Sardine,
         serverUrl: String,
         onProgress: (current: Int, total: Int, noteTitle: String) -> Unit = { _, _, _ -> }  // 🆕 v1.8.0
@@ -1128,7 +1128,7 @@ class WebDavSyncService(private val context: Context) {
      * @param localNotes Alle lokalen Notizen
      * @return Anzahl der als DELETED_ON_SERVER markierten Notizen
      */
-    private fun detectServerDeletions(
+    suspend private fun detectServerDeletions(
         serverNoteIds: Set<String>,
         localNotes: List<Note>
     ): Int {
@@ -1194,7 +1194,7 @@ class WebDavSyncService(private val context: Context) {
     )
     // Sync logic requires nested conditions for comprehensive error handling and conflict resolution
     // TODO: Refactor into smaller functions in v1.9.0/v2.0.0 (see LINT_DETEKT_FEHLER_BEHEBUNG_PLAN.md)
-    private fun downloadRemoteNotes(
+    suspend private fun downloadRemoteNotes(
         sardine: Sardine,
         serverUrl: String,
         includeRootFallback: Boolean = false,  // 🆕 v1.2.2: Only for restore from server
@@ -1822,7 +1822,7 @@ class WebDavSyncService(private val context: Context) {
      */
     @Suppress("NestedBlockDepth", "LoopWithTooManyJumpStatements")
     // Import logic requires nested conditions for file validation and duplicate handling
-    private fun importMarkdownFiles(sardine: Sardine, serverUrl: String): Int {
+    private suspend fun importMarkdownFiles(sardine: Sardine, serverUrl: String): Int {
         return try {
             Logger.d(TAG, "📝 Importing Markdown files...")
 

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/NoteEditorViewModel.kt

@@ -2,6 +2,7 @@ package dev.dettmer.simplenotes.ui.editor
 
 import android.app.Application
 import android.content.Context
+import android.content.SharedPreferences
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.viewModelScope
@@ -29,7 +30,9 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import org.koin.java.KoinJavaComponent.inject
 import java.util.UUID
+import kotlin.getValue
 
 /**
  * ViewModel for NoteEditor Compose Screen
@@ -48,8 +51,8 @@ class NoteEditorViewModel(
         const val ARG_NOTE_TYPE = "noteType"
     }
 
-    private val storage = NotesStorage(application)
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
-    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    private val prefs: SharedPreferences by inject(SharedPreferences::class.java)
 
     // ═══════════════════════════════════════════════════════════════════════
     // State
@@ -97,7 +100,7 @@ class NoteEditorViewModel(
         }
     }
 
-    private fun loadExistingNote(noteId: String) {
+    private fun loadExistingNote(noteId: String) = viewModelScope.launch{
         existingNote = storage.loadNote(noteId)
         existingNote?.let { note ->
             currentNoteType = note.noteType
@@ -564,10 +567,10 @@ class NoteEditorViewModel(
      * Nur checklistItems werden aktualisiert — nicht title oder content,
      * damit ungespeicherte Text-Änderungen im Editor nicht verloren gehen.
      */
-    fun reloadFromStorage() {
+    fun reloadFromStorage() = viewModelScope.launch{
-        val noteId = savedStateHandle.get<String>(ARG_NOTE_ID) ?: return
+        val noteId = savedStateHandle.get<String>(ARG_NOTE_ID) ?: return@launch
 
-        val freshNote = storage.loadNote(noteId) ?: return
+        val freshNote = storage.loadNote(noteId) ?: return@launch
 
         // Nur Checklist-Items aktualisieren
         if (freshNote.noteType == NoteType.CHECKLIST) {
@@ -578,7 +581,7 @@ class NoteEditorViewModel(
                     isChecked = it.isChecked,
                     order = it.order
                 )
-            } ?: return
+            } ?: return@launch
 
             _checklistItems.value = sortChecklistItems(freshItems)
             // existingNote aktualisieren damit beim Speichern der richtige

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/ComposeMainActivity.kt

@@ -8,6 +8,7 @@ import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
+import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.os.Build
 import android.os.Bundle
@@ -44,6 +45,9 @@ import dev.dettmer.simplenotes.utils.Constants
 import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.utils.NotificationHelper
 import kotlinx.coroutines.launch
+import org.koin.androidx.viewmodel.ext.android.viewModel
+import org.koin.java.KoinJavaComponent.inject
+import kotlin.getValue
 
 /**
  * Main Activity with Jetpack Compose UI
@@ -65,11 +69,10 @@ class ComposeMainActivity : ComponentActivity() {
         private const val REQUEST_SETTINGS = 1002
     }
 
-    private val viewModel: MainViewModel by viewModels()
+    private val viewModel: MainViewModel by viewModel()
 
-    private val prefs by lazy {
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
-        getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    private val prefs: SharedPreferences by inject(SharedPreferences::class.java)
-    }
 
     // Phase 3: Track if coming from editor to scroll to top
     private var cameFromEditor = false
@@ -308,37 +311,8 @@ class ComposeMainActivity : ComponentActivity() {
      * v1.4.1: Migrates existing checklists for backwards compatibility.
      */
     private fun migrateChecklistsForBackwardsCompat() {
-        val migrationKey = "v1.4.1_checklist_migration_done"
+        viewModel.migrateChecklistsForBackwardsCompat()
 
-        // Only run once
-        if (prefs.getBoolean(migrationKey, false)) {
-            return
-        }
-        
-        val storage = NotesStorage(this)
-        val allNotes = storage.loadAllNotes()
-        val checklistsToMigrate = allNotes.filter { note ->
-            note.noteType == NoteType.CHECKLIST && 
-            note.content.isBlank() &&
-            note.checklistItems?.isNotEmpty() == true
-        }
-        
-        if (checklistsToMigrate.isNotEmpty()) {
-            Logger.d(TAG, "🔄 v1.4.1 Migration: Found ${checklistsToMigrate.size} checklists without fallback content")
-            
-            for (note in checklistsToMigrate) {
-                val updatedNote = note.copy(
-                    syncStatus = SyncStatus.PENDING
-                )
-                storage.saveNote(updatedNote)
-                Logger.d(TAG, "   📝 Marked for re-sync: ${note.title}")
-            }
-            
-            Logger.d(TAG, "✅ v1.4.1 Migration: ${checklistsToMigrate.size} checklists marked for re-sync")
-        }
-        
-        // Mark migration as done
-        prefs.edit().putBoolean(migrationKey, true).apply()
     }
 
     @Deprecated("Deprecated in Java")

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainScreen.kt

@@ -59,6 +59,7 @@ import dev.dettmer.simplenotes.ui.main.components.NotesStaggeredGrid
 import dev.dettmer.simplenotes.ui.main.components.SyncProgressBanner
 import dev.dettmer.simplenotes.ui.main.components.SyncStatusLegendDialog
 import kotlinx.coroutines.launch
+import org.koin.androidx.compose.koinViewModel
 
 private const val TIMESTAMP_UPDATE_INTERVAL_MS = 30_000L
 
@@ -74,7 +75,7 @@ private const val TIMESTAMP_UPDATE_INTERVAL_MS = 30_000L
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun MainScreen(
-    viewModel: MainViewModel,
+    viewModel: MainViewModel = koinViewModel(),
     onOpenNote: (String?) -> Unit,
     onOpenSettings: () -> Unit,
     onCreateNote: (NoteType) -> Unit

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainViewModel.kt

@@ -2,12 +2,15 @@ package dev.dettmer.simplenotes.ui.main
 
 import android.app.Application
 import android.content.Context
+import android.content.SharedPreferences
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.models.SortDirection
 import dev.dettmer.simplenotes.models.SortOption
 import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.sync.SyncProgress
 import dev.dettmer.simplenotes.sync.SyncStateManager
@@ -27,6 +30,8 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import org.koin.java.KoinJavaComponent.inject
+import kotlin.getValue
 
 /**
  * ViewModel for MainActivity Compose
@@ -42,8 +47,8 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         private const val PREF_LAST_AUTO_SYNC_TIME = "last_auto_sync_timestamp"
     }
 
-    private val storage = NotesStorage(application)
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
-    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    private val prefs: SharedPreferences by inject(SharedPreferences::class.java)
 
     // ═══════════════════════════════════════════════════════════════════════
     // Notes State
@@ -292,11 +297,11 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     /**
      * Delete all selected notes
      */
-    fun deleteSelectedNotes(deleteFromServer: Boolean) {
+    fun deleteSelectedNotes(deleteFromServer: Boolean) = viewModelScope.launch {
         val selectedIds = _selectedNotes.value.toList()
         val selectedNotes = _notes.value.filter { it.id in selectedIds }
 
-        if (selectedNotes.isEmpty()) return
+        if (selectedNotes.isEmpty()) return@launch
 
         // Add to pending deletions
         _pendingDeletions.value = _pendingDeletions.value + selectedIds.toSet()
@@ -351,7 +356,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     /**
      * Undo deletion of multiple notes
      */
-    private fun undoDeleteMultiple(notes: List<Note>) {
+    private fun undoDeleteMultiple(notes: List<Note>) = viewModelScope.launch{
         // Remove from pending deletions
         _pendingDeletions.value = _pendingDeletions.value - notes.map { it.id }.toSet()
 
@@ -403,7 +408,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     /**
      * Confirm note deletion (from dialog or auto-delete)
      */
-    fun deleteNoteConfirmed(note: Note, deleteFromServer: Boolean) {
+    fun deleteNoteConfirmed(note: Note, deleteFromServer: Boolean) = viewModelScope.launch{
         // Add to pending deletions
         _pendingDeletions.value = _pendingDeletions.value + note.id
 
@@ -447,7 +452,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     /**
      * Undo note deletion
      */
-    fun undoDelete(note: Note) {
+    fun undoDelete(note: Note) = viewModelScope.launch{
         // Remove from pending deletions
         _pendingDeletions.value = _pendingDeletions.value - note.id
 
@@ -827,4 +832,37 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
         return !serverUrl.isNullOrEmpty() && serverUrl != "http://" && serverUrl != "https://"
     }
+
+    fun migrateChecklistsForBackwardsCompat() = viewModelScope.launch{
+        val migrationKey = "v1.4.1_checklist_migration_done"
+
+        // Only run once
+        if (prefs.getBoolean(migrationKey, false)) {
+            return@launch
+        }
+
+        val allNotes = storage.loadAllNotes()
+        val checklistsToMigrate = allNotes.filter { note ->
+            note.noteType == NoteType.CHECKLIST &&
+                note.content.isBlank() &&
+                note.checklistItems?.isNotEmpty() == true
+        }
+
+        if (checklistsToMigrate.isNotEmpty()) {
+            Logger.d(TAG, "🔄 v1.4.1 Migration: Found ${checklistsToMigrate.size} checklists without fallback content")
+
+            for (note in checklistsToMigrate) {
+                val updatedNote = note.copy(
+                    syncStatus = SyncStatus.PENDING
+                )
+                storage.saveNote(updatedNote)
+                Logger.d(TAG, "   📝 Marked for re-sync: ${note.title}")
+            }
+
+            Logger.d(TAG, "✅ v1.4.1 Migration: ${checklistsToMigrate.size} checklists marked for re-sync")
+        }
+
+        // Mark migration as done
+        prefs.edit().putBoolean(migrationKey, true).apply()
+    }
 }

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsViewModel.kt

@@ -2,6 +2,7 @@ package dev.dettmer.simplenotes.ui.settings
 
 import android.app.Application
 import android.content.Context
+import android.content.SharedPreferences
 import android.net.Uri
 import android.util.Log
 import androidx.lifecycle.AndroidViewModel
@@ -26,8 +27,10 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import org.koin.java.KoinJavaComponent.inject
 import java.net.HttpURLConnection
 import java.net.URL
+import kotlin.getValue
 
 /**
  * ViewModel for Settings screens
@@ -45,9 +48,9 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         private const val STATUS_CLEAR_DELAY_ERROR_MS = 3000L    // 3s for errors (more important)
     }
 
-    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
     val backupManager = BackupManager(application)
-    private val notesStorage = NotesStorage(application) // v1.7.0: For server change detection
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
+    private val prefs: SharedPreferences by inject(SharedPreferences::class.java)
 
     // 🔧 v1.7.0 Hotfix: Track last confirmed server URL for change detection
     // This prevents false-positive "server changed" toasts during text input
@@ -308,7 +311,7 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         // Reset sync status if server actually changed
         if (serverChanged) {
             viewModelScope.launch {
-                val count = notesStorage.resetAllSyncStatusToPending()
+                val count = storage.resetAllSyncStatusToPending()
                 Logger.d(TAG, "🔄 Server changed from '$confirmedServerUrl' to '$fullUrl': Reset $count notes to PENDING")
                 emitToast(getString(R.string.toast_server_changed_sync_reset, count))
             }
@@ -589,8 +592,7 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                     }
 
                     // Check if there are notes to export
-                    val noteStorage = dev.dettmer.simplenotes.storage.NotesStorage(getApplication())
+                    val noteCount = storage.loadAllNotes().size
-                    val noteCount = noteStorage.loadAllNotes().size
 
                     if (noteCount > 0) {
                         // Show progress and perform initial export

android/app/src/main/java/dev/dettmer/simplenotes/widget/NoteWidget.kt

@@ -1,6 +1,7 @@
 package dev.dettmer.simplenotes.widget
 
 import android.content.Context
+import android.content.SharedPreferences
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
 import androidx.datastore.preferences.core.Preferences
@@ -12,6 +13,9 @@ import androidx.glance.appwidget.provideContent
 import androidx.glance.currentState
 import androidx.glance.state.PreferencesGlanceStateDefinition
 import dev.dettmer.simplenotes.storage.NotesStorage
+import kotlinx.coroutines.runBlocking
+import org.koin.java.KoinJavaComponent.inject
+import kotlin.getValue
 
 /**
  * 🆕 v1.8.0: Homescreen Widget für Notizen und Checklisten
@@ -52,10 +56,11 @@ class NoteWidget : GlanceAppWidget() {
         )
     )
 
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
+
     override val stateDefinition = PreferencesGlanceStateDefinition
 
     override suspend fun provideGlance(context: Context, id: GlanceId) {
-        val storage = NotesStorage(context)
 
         provideContent {
             val prefs = currentState<Preferences>()
@@ -65,7 +70,7 @@ class NoteWidget : GlanceAppWidget() {
             val bgOpacity = prefs[NoteWidgetState.KEY_BACKGROUND_OPACITY] ?: 1.0f
 
             val note = noteId?.let { nId ->
-                storage.loadNote(nId)
+                runBlocking { storage.loadNote(nId) }
             }
 
             GlanceTheme {

android/app/src/main/java/dev/dettmer/simplenotes/widget/NoteWidgetActions.kt

@@ -9,6 +9,7 @@ import dev.dettmer.simplenotes.models.ChecklistSortOption
 import dev.dettmer.simplenotes.models.SyncStatus
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.utils.Logger
+import org.koin.java.KoinJavaComponent.inject
 
 /**
  * 🆕 v1.8.0: ActionParameter Keys für Widget-Interaktionen
@@ -35,6 +36,9 @@ class ToggleChecklistItemAction : ActionCallback {
         private const val TAG = "ToggleChecklistItem"
     }
 
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
+
+
     override suspend fun onAction(
         context: Context,
         glanceId: GlanceId,
@@ -43,7 +47,6 @@ class ToggleChecklistItemAction : ActionCallback {
         val noteId = parameters[NoteWidgetActionKeys.KEY_NOTE_ID] ?: return
         val itemId = parameters[NoteWidgetActionKeys.KEY_ITEM_ID] ?: return
 
-        val storage = NotesStorage(context)
         val note = storage.loadNote(noteId) ?: return
 
         val updatedItems = note.checklistItems?.map { item ->

android/app/src/main/java/dev/dettmer/simplenotes/widget/NoteWidgetConfigActivity.kt

@@ -14,6 +14,8 @@ import androidx.lifecycle.lifecycleScope
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.ui.theme.SimpleNotesTheme
 import kotlinx.coroutines.launch
+import org.koin.java.KoinJavaComponent.inject
+import kotlin.getValue
 
 /**
  * 🆕 v1.8.0: Konfigurations-Activity beim Platzieren eines Widgets
@@ -40,6 +42,8 @@ class NoteWidgetConfigActivity : ComponentActivity() {
     private var currentLockState: Boolean = false
     private var currentOpacity: Float = 1.0f
 
+    private val storage: NotesStorage by inject(NotesStorage::class.java)
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -69,13 +73,12 @@ class NoteWidgetConfigActivity : ComponentActivity() {
             return
         }
 
-        val storage = NotesStorage(this)
-
         // Bestehende Konfiguration laden (für Reconfigure)
         lifecycleScope.launch {
             var existingNoteId: String? = null
             var existingLock = false
             var existingOpacity = 1.0f
+            val notes = storage.loadAllNotes()
 
             try {
                 val glanceId = GlanceAppWidgetManager(this@NoteWidgetConfigActivity)
@@ -100,7 +103,7 @@ class NoteWidgetConfigActivity : ComponentActivity() {
             setContent {
                 SimpleNotesTheme {
                     NoteWidgetConfigScreen(
-                        storage = storage,
+                        notes = notes,
                         initialLock = existingLock,
                         initialOpacity = existingOpacity,
                         selectedNoteId = existingNoteId,

android/app/src/main/java/dev/dettmer/simplenotes/widget/NoteWidgetConfigScreen.kt

@@ -41,7 +41,6 @@ import androidx.compose.ui.unit.dp
 import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.models.NoteType
-import dev.dettmer.simplenotes.storage.NotesStorage
 import kotlin.math.roundToInt
 
 /**
@@ -59,16 +58,16 @@ private const val NOTE_PREVIEW_MAX_LENGTH = 50
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun NoteWidgetConfigScreen(
-    storage: NotesStorage,
+    notes: List<Note>,
     initialLock: Boolean = false,
     initialOpacity: Float = 1.0f,
     selectedNoteId: String? = null,
-    onNoteSelected: (noteId: String, isLocked: Boolean, opacity: Float) -> Unit,
+    onNoteSelected: (String, Boolean, Float) -> Unit,
-    onSave: ((noteId: String, isLocked: Boolean, opacity: Float) -> Unit)? = null,
+    onSave: ((String, Boolean, Float) -> Unit)? = null,
-    onSettingsChanged: ((noteId: String?, isLocked: Boolean, opacity: Float) -> Unit)? = null,
+    onSettingsChanged: ((String?, Boolean, Float) -> Unit)? = null,
     @Suppress("UNUSED_PARAMETER") onCancel: () -> Unit  // Reserved for future use
 ) {
-    val allNotes = remember { storage.loadAllNotes().sortedByDescending { it.updatedAt } }
+    val allNotes = remember { notes.sortedByDescending { it.updatedAt } }
     var lockWidget by remember { mutableStateOf(initialLock) }
     var opacity by remember { mutableFloatStateOf(initialOpacity) }
     var currentSelectedId by remember { mutableStateOf(selectedNoteId) }

android/app/src/test/java/dev/dettmer/simplenotes/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package dev.dettmer.simplenotes
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}

android/gradle/libs.versions.toml

@@ -16,6 +16,9 @@ composeBom = "2026.01.00"
 navigationCompose = "2.7.6"
 lifecycleRuntimeCompose = "2.7.0"
 activityCompose = "1.8.2"
+room = "2.6.1"
+ksp = "2.0.21-1.0.27"
+koin = "3.5.3"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -37,6 +40,14 @@ androidx-compose-material-icons = { group = "androidx.compose.material", name =
 androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
 androidx-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "navigationCompose" }
 androidx-lifecycle-runtime-compose = { group = "androidx.lifecycle", name = "lifecycle-runtime-compose", version.ref = "lifecycleRuntimeCompose" }
+# Room Database
+room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
+room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
+room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
+# Core Koin for Kotlin projects
+koin-android = { group = "io.insert-koin", name = "koin-android", version.ref = "koin" }
+# Koin for Jetpack Compose integration
+koin-androidx-compose = { group = "io.insert-koin", name = "koin-androidx-compose", version.ref = "koin" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
@@ -44,4 +55,5 @@ kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 ktlint = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }
 detekt = { id = "io.gitlab.arturbosch.detekt", version.ref = "detekt" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }