refactor: Update Note and Category models to use 'id' instead of 'uuid', and adjust related database operations

- Changed 'uuid' to 'id' in Note and Category models for consistency.
- Updated database operations in NoteRepository to reflect the new 'id' field.
- Modified sync models to accommodate changes in Note and Category structures.
- Adjusted the handling of notes and categories during synchronization.
- Refactored the note editor and home screen to use the new 'id' field.
- Ensured that the 'isDirty' flag is properly set and utilized across models.

lib/app.dart

@@ -753,14 +753,14 @@ class _NotesAppState extends State<NotesApp>
           }
         });
       }
-    } catch (e) {
+    } catch (e, st) {
       if (!mounted) {
         return;
       }
 
       setState(() {
         _syncStatus = SyncStatus.error;
-        _syncErrorMessage = e.toString();
+        _syncErrorMessage = '$e\n\nStackTrace: $st';
         _syncProgress = null;
         _syncDetailMessage = null;
       });

lib/data/api_client.dart

@@ -277,9 +277,23 @@ class AuthApi {
     debugPrint('Response body: ${res.body}');
 
     if (res.statusCode >= 200 && res.statusCode < 300) {
-      final Map<String, dynamic> json =
+      try {
-          jsonDecode(res.body) as Map<String, dynamic>;
+        final Map<String, dynamic> json =
-      return {'error': false, 'data': SyncResponse.fromJson(json)};
+            jsonDecode(res.body) as Map<String, dynamic>;
+        return {'error': false, 'data': SyncResponse.fromJson(json)};
+      } catch (e, st) {
+        debugPrint('SYNC PARSE ERROR -> $e');
+        debugPrint(st.toString());
+        debugPrint('SYNC PARSE RAW BODY -> ${res.body}');
+        return {
+          'error': true,
+          'message': 'Error parseando respuesta de sync: $e',
+          'exception': e.toString(),
+          'stackTrace': st.toString(),
+          'body': res.body,
+          'status': res.statusCode,
+        };
+      }
     }
 
     // If token expired (401), try to refresh
@@ -298,8 +312,16 @@ class AuthApi {
     try {
       final dynamic decoded = jsonDecode(res.body);
       return {'error': true, 'status': res.statusCode, 'body': decoded};
-    } catch (_) {
+    } catch (e, st) {
-      return {'error': true, 'status': res.statusCode, 'body': res.body};
+      debugPrint('SYNC HTTP ERROR PARSE FAILED -> $e');
+      debugPrint(st.toString());
+      return {
+        'error': true,
+        'status': res.statusCode,
+        'body': res.body,
+        'exception': e.toString(),
+        'stackTrace': st.toString(),
+      };
     }
   }
 

lib/data/app_database.dart

@@ -9,22 +9,23 @@ part 'app_database.g.dart';
 
 @DataClassName('DbCategory')
 class Categories extends Table {
-  TextColumn get uuid => text().unique()();
+  TextColumn get id => text()();
   TextColumn get encryptedName => text().named('encrypted_name')();
   IntColumn get serverVersion =>
       integer().named('server_version').withDefault(const Constant(0))();
   BoolColumn get isDeleted =>
       boolean().named('is_deleted').withDefault(const Constant(false))();
+  BoolColumn get isDirty =>
+      boolean().named('is_dirty').withDefault(const Constant(true))();
   DateTimeColumn get updatedAt => dateTime().named('updated_at')();
 
   @override
-  Set<Column> get primaryKey => {uuid};
+  Set<Column> get primaryKey => {id};
 }
 
 @DataClassName('DbNote')
 class Notes extends Table {
-  IntColumn get id => integer().autoIncrement()();
+  TextColumn get id => text().named('id')();
-  TextColumn get uuid => text().unique()();
   TextColumn get title => text()();
   TextColumn get body => text()();
   DateTimeColumn get createdAt => dateTime().named('created_at')();
@@ -35,12 +36,34 @@ class Notes extends Table {
   BoolColumn get isDeleted =>
       boolean().named('is_deleted').withDefault(const Constant(false))();
   TextColumn get categoryId => text().nullable().named('category_id')();
+    BoolColumn get isDirty =>
+      boolean().named('is_dirty').withDefault(const Constant(true))();
+
+    @override
+    Set<Column> get primaryKey => {id};
 }
 
 @DriftDatabase(tables: [Notes, Categories])
 class AppDatabase extends _$AppDatabase {
   @override
-  int get schemaVersion => 1;
+  int get schemaVersion => 2;
+
+  @override
+  MigrationStrategy get migration => MigrationStrategy(
+    onCreate: (Migrator migrator) async {
+      await migrator.createAll();
+    },
+    onUpgrade: (Migrator migrator, int from, int to) async {
+      if (from < 2) {
+        await migrator.addColumn(notes, notes.isDirty);
+        await migrator.addColumn(categories, categories.isDirty);
+
+        await customStatement('UPDATE notes SET is_dirty = 0');
+        await customStatement('UPDATE categories SET is_dirty = 0');
+      }
+    },
+  );
+
   AppDatabase({required String encryptionKey})
     : super(_openConnection(encryptionKey));
 
@@ -53,8 +76,8 @@ class AppDatabase extends _$AppDatabase {
     return into(categories).insertOnConflictUpdate(category);
   }
 
-  Future<void> deleteCategory(String uuid) {
+  Future<void> deleteCategory(String id) {
-    return (update(categories)..where((c) => c.uuid.equals(uuid))).write(
+    return (update(categories)..where((c) => c.id.equals(id))).write(
       CategoriesCompanion(isDeleted: Value(true)),
     );
   }
@@ -70,7 +93,7 @@ class AppDatabase extends _$AppDatabase {
   Future<int> insertNoteAtTop(NotesCompanion note) {
     return transaction(() async {
       await customStatement(
-        'UPDATE notes SET sort_index = sort_index + 1 WHERE is_deleted = 0',
+        'UPDATE notes SET sort_index = sort_index + 1, is_dirty = 1 WHERE is_deleted = 0',
       );
       return into(notes).insert(note.copyWith(sortIndex: const Value<int>(0)));
     });
@@ -90,28 +113,29 @@ class AppDatabase extends _$AppDatabase {
     return update(notes).replace(note);
   }
 
-  Future<void> deleteNote(int id, int removedIndex) async {
+  Future<void> deleteNote(String id, int removedIndex) async {
     await (update(notes)..where((n) => n.id.equals(id))).write(
       NotesCompanion(
         isDeleted: const Value(true),
         updatedAt: Value(DateTime.now()),
+        isDirty: const Value(true),
       ),
     );
 
     await customStatement(
-      'UPDATE notes SET sort_index = sort_index - 1 WHERE sort_index > ? AND is_deleted = 0',
+      'UPDATE notes SET sort_index = sort_index - 1, is_dirty = 1 WHERE sort_index > ? AND is_deleted = 0',
       [removedIndex],
     );
   }
 
   Future<void> deleteNoteAndShift({
-    required int id,
+    required String id,
     required int removedIndex,
   }) {
     return deleteNote(id, removedIndex);
   }
 
-  Future<void> permanentlyDeleteNote(int id) async {
+  Future<void> permanentlyDeleteNote(String id) async {
     await (update(notes)..where((n) => n.id.equals(id))).write(
       NotesCompanion(
         title: const Value(''),
@@ -119,12 +143,13 @@ class AppDatabase extends _$AppDatabase {
         categoryId: const Value(null),
         isDeleted: const Value(true),
         updatedAt: Value(DateTime.now()),
+        isDirty: const Value(true),
       ),
     );
   }
 
   Future<void> moveNote({
-    required int id,
+    required String id,
     required int oldIndex,
     required int newIndex,
   }) {
@@ -133,9 +158,9 @@ class AppDatabase extends _$AppDatabase {
     }
 
     return transaction(() async {
-      final List<DbNote> all = await (select(notes)
+      final List<DbNote> all = await (select(
-            ..where((n) => n.isDeleted.equals(false)))
+        notes,
-          .get();
+      )..where((n) => n.isDeleted.equals(false))).get();
 
       final int count = all.length;
       if (count == 0) {
@@ -153,12 +178,12 @@ class AppDatabase extends _$AppDatabase {
 
       if (safeOld < safeNew) {
         await customStatement(
-          'UPDATE notes SET sort_index = sort_index - 1 WHERE sort_index > ? AND sort_index <= ? AND is_deleted = 0',
+          'UPDATE notes SET sort_index = sort_index - 1, is_dirty = 1 WHERE sort_index > ? AND sort_index <= ? AND is_deleted = 0',
           [safeOld, safeNew],
         );
       } else {
         await customStatement(
-          'UPDATE notes SET sort_index = sort_index + 1 WHERE sort_index >= ? AND sort_index < ? AND is_deleted = 0',
+          'UPDATE notes SET sort_index = sort_index + 1, is_dirty = 1 WHERE sort_index >= ? AND sort_index < ? AND is_deleted = 0',
           [safeNew, safeOld],
         );
       }
@@ -167,6 +192,7 @@ class AppDatabase extends _$AppDatabase {
         NotesCompanion(
           sortIndex: Value<int>(safeNew),
           updatedAt: Value<DateTime>(DateTime.now()),
+          isDirty: const Value(true),
         ),
       );
     });
@@ -179,8 +205,12 @@ class AppDatabase extends _$AppDatabase {
   }
 
   Future<List<DbNote>> getDeletedNotes() {
-    return (select(notes)
+    return (select(notes)..where(
-          ..where((n) => n.isDeleted.equals(true) & n.title.isNotValue('') & n.body.isNotValue('')))
+          (n) =>
+              n.isDeleted.equals(true) &
+              n.title.isNotValue('') &
+              n.body.isNotValue(''),
+        ))
         .get();
   }
 
@@ -192,15 +222,11 @@ class AppDatabase extends _$AppDatabase {
 
   // ========== Sync helpers ==========
   Future<List<DbNote>> getUnsyncedNotes() {
-    return (select(notes)
+    return (select(notes)..where((n) => n.isDirty.equals(true))).get();
-          ..where((n) => n.isDeleted.equals(true) | n.serverVersion.equals(0)))
-        .get();
   }
 
   Future<List<DbCategory>> getUnsyncedCategories() {
-    return (select(categories)
+    return (select(categories)..where((c) => c.isDirty.equals(true))).get();
-          ..where((c) => c.isDeleted.equals(true) | c.serverVersion.equals(0)))
-        .get();
   }
 }
 

lib/data/note_repository.dart

@@ -35,9 +35,9 @@ class NoteRepository {
   }
 
   Future<Note> createNote(Note note) async {
-    final int id = await _database.insertNoteAtTop(
+    await _database.insertNoteAtTop(
       NotesCompanion.insert(
-        uuid: note.uuid,
+        id: note.id,
         title: note.title,
         body: note.body,
         createdAt: note.createdAt,
@@ -45,56 +45,77 @@ class NoteRepository {
         sortIndex: 0,
         serverVersion: const Value(0),
         isDeleted: const Value(false),
-        categoryId: const Value(null),
+        categoryId: Value(note.categoryId),
+        isDirty: const Value(true),
       ),
     );
 
-    return note.copyWith(id: id, index: 0);
+    return note.copyWith(position: 0, isDirty: true);
   }
 
   Future<Note> updateNote(Note note) async {
-    final int noteId =
+    final DbNote? existingNote = await (_database.select(
-        note.id ??
+      _database.notes,
-        (throw ArgumentError('Note id is required to update a note.'));
+    )..where((n) => n.id.equals(note.id))).getSingleOrNull();
+
+    final DbNote row =
+        existingNote ??
+      (throw ArgumentError('Note not found for id ${note.id}.'));
 
     await _database.updateNoteRow(
       DbNote(
-        id: noteId,
+        id: row.id,
-        uuid: note.uuid,
         title: note.title,
         body: note.body,
-        createdAt: note.createdAt,
+        createdAt: row.createdAt,
         updatedAt: note.updatedAt,
-        sortIndex: note.index,
+        sortIndex: row.sortIndex,
         serverVersion: note.serverVersion,
         isDeleted: false,
         categoryId: note.categoryId,
+        isDirty: true,
       ),
     );
 
-    return note.copyWith(isDeleted: false, isPermanentlyDeleted: false);
+    return note.copyWith(
+      isDeleted: false,
+      isPermanentlyDeleted: false,
+      isDirty: true,
+      position: row.sortIndex.toDouble(),
+    );
   }
 
   Future<void> deleteNote(Note note) async {
-    final int noteId =
+    final DbNote? existingNote = await (_database.select(
-        note.id ??
+      _database.notes,
-        (throw ArgumentError('Note id is required to delete a note.'));
+    )..where((n) => n.id.equals(note.id))).getSingleOrNull();
 
-    if (note.isDeleted || note.isPermanentlyDeleted) {
+    final DbNote row =
-      await _database.permanentlyDeleteNote(noteId);
+        existingNote ??
+      (throw ArgumentError('Note not found for id ${note.id}.'));
+
+    if (row.isDeleted || note.isDeleted || note.isPermanentlyDeleted) {
+      await _database.permanentlyDeleteNote(row.id);
     } else {
-      await _database.deleteNoteAndShift(id: noteId, removedIndex: note.index);
+      await _database.deleteNoteAndShift(
+        id: row.id,
+        removedIndex: row.sortIndex,
+      );
     }
   }
 
   Future<void> moveNote(Note note, int newIndex) async {
-    final int noteId =
+    final DbNote? existingNote = await (_database.select(
-        note.id ??
+      _database.notes,
-        (throw ArgumentError('Note id is required to reorder a note.'));
+    )..where((n) => n.id.equals(note.id))).getSingleOrNull();
+
+    final DbNote row =
+        existingNote ??
+      (throw ArgumentError('Note not found for id ${note.id}.'));
 
     await _database.moveNote(
-      id: noteId,
+      id: row.id,
-      oldIndex: note.index,
+      oldIndex: row.sortIndex,
       newIndex: newIndex,
     );
   }
@@ -120,26 +141,17 @@ class NoteRepository {
           ? DateTime.utc(1970, 1, 1)
           : lastSync;
 
-      // Collect pending local changes.
+      // Collect pending local changes. Dirty flags are the source of truth for
-      // If we already synced at least once, use updatedAt to avoid re-sending
+      // outbound sync; `lastSyncAt` is only used for asking the server what it
-      // old notes that were already uploaded.
+      // changed since our previous successful sync.
-      final List<DbNote> unsyncedNotes;
+      final List<DbNote> unsyncedNotes = await _database.getUnsyncedNotes();
-      final List<DbCategory> unsyncedCategories;
+      final List<DbCategory> unsyncedCategories = await _database
-
+          .getUnsyncedCategories();
-      if (forceFull || lastSync == null) {
-        unsyncedNotes = await _database.getUnsyncedNotes();
-        unsyncedCategories = await _database.getUnsyncedCategories();
-      } else {
-        unsyncedNotes = await _database.getNotesChangedSince(lastSync);
-        unsyncedCategories = await _database.getCategoriesChangedSince(
-          lastSync,
-        );
-      }
 
       final int totalNotesToEncrypt = unsyncedNotes.length;
 
-      // Build sync request (note: we send encrypted data, but locally we have plaintext)
+      // Build sync request: local data is plaintext, encryption happens only
-      // Encrypt notes that still contain content before sending.
+      // for the outbound payload.
       if (totalNotesToEncrypt == 0) {
         onProgress?.call(
           SyncStatus.encrypting,
@@ -164,9 +176,8 @@ class NoteRepository {
         },
       );
 
-      final List<SyncCategoryPayload> categoriesPayload = unsyncedCategories
+      final List<SyncCategoryPayload> categoriesPayload =
-          .map((cat) => SyncCategoryPayload.fromCategory(_fromDbCategory(cat)))
+          await _encryptCategories(unsyncedCategories, masterKey: _masterKey);
-          .toList();
 
       final SyncRequest syncRequest = SyncRequest(
         lastSyncAt: lastSyncForRequest,
@@ -184,7 +195,27 @@ class NoteRepository {
       final Map<String, dynamic> syncResult = await _authApi.sync(syncRequest);
 
       if (syncResult['error'] == true) {
-        return {'error': true, 'message': syncResult['body']};
+        final List<String> details = [];
+        final Object? message = syncResult['message'];
+        final Object? exception = syncResult['exception'];
+        final Object? stackTrace = syncResult['stackTrace'];
+        final Object? body = syncResult['body'];
+
+        if (message != null) details.add(message.toString());
+        if (exception != null && exception.toString() != details.firstOrNull) {
+          details.add('Exception: ${exception.toString()}');
+        }
+        if (body != null) {
+          details.add('Body: ${body.toString()}');
+        }
+        if (stackTrace != null) {
+          details.add('StackTrace: ${stackTrace.toString()}');
+        }
+
+        return {
+          'error': true,
+          'message': details.join('\n\n'),
+        };
       }
 
       final SyncResponse response = syncResult['data'] as SyncResponse;
@@ -217,8 +248,11 @@ class NoteRepository {
         'notesCount': response.changes.notes.length,
         'categoriesCount': response.changes.categories.length,
       };
-    } catch (e) {
+    } catch (e, st) {
-      return {'error': true, 'message': e.toString()};
+      return {
+        'error': true,
+        'message': '$e\n\nStackTrace: $st',
+      };
     }
   }
 
@@ -229,13 +263,23 @@ class NoteRepository {
     // Apply categories from server
     for (final SyncCategoryResponse catResponse
         in response.changes.categories) {
+      final String categoryName =
+          catResponse.isDeleted || catResponse.encryptedName.isEmpty
+          ? ''
+          : await NoteEncryption.decryptNote(
+              catResponse.encryptedName,
+              _masterKey,
+            );
+
+
       await _database.upsertCategory(
         CategoriesCompanion(
-          uuid: Value(catResponse.id),
+          id: Value(catResponse.id),
-          encryptedName: Value(catResponse.encryptedName),
+          encryptedName: Value(categoryName),
           serverVersion: Value(catResponse.serverVersion),
           isDeleted: Value(catResponse.isDeleted),
           updatedAt: Value(catResponse.updatedAt),
+          isDirty: const Value(false),
         ),
       );
     }
@@ -254,14 +298,14 @@ class NoteRepository {
 
     for (var index = 0; index < decryptedNotes.length; index += 1) {
       final Map<String, Object?> decryptedNote = decryptedNotes[index];
-      final String noteId = decryptedNote['id']! as String;
+      final SyncNoteResponse noteResponse = response.changes.notes[index];
+      final String noteId = (decryptedNote['id'] as String?) ?? noteResponse.id;
       final existingNote = await (_database.select(
         _database.notes,
-      )..where((n) => n.uuid.equals(noteId))).getSingleOrNull();
+      )..where((n) => n.id.equals(noteId))).getSingleOrNull();
 
-      final String decryptedTitle = decryptedNote['title']! as String;
+      final String decryptedTitle = (decryptedNote['title'] as String?) ?? '';
-      final String decryptedBody = decryptedNote['body']! as String;
+      final String decryptedBody = (decryptedNote['body'] as String?) ?? '';
-      final SyncNoteResponse noteResponse = response.changes.notes[index];
       final bool isPermanentlyDeleted = noteResponse.isPermanentlyDeleted;
 
       if (existingNote != null) {
@@ -269,15 +313,15 @@ class NoteRepository {
         await _database.updateNoteRow(
           DbNote(
             id: existingNote.id,
-            uuid: noteId,
             title: isPermanentlyDeleted ? '' : decryptedTitle,
             body: isPermanentlyDeleted ? '' : decryptedBody,
             createdAt: existingNote.createdAt,
             updatedAt: noteResponse.updatedAt,
-            sortIndex: noteResponse.position,
+            sortIndex: noteResponse.position.round(),
             serverVersion: noteResponse.serverVersion,
             isDeleted: noteResponse.isDeleted,
             categoryId: isPermanentlyDeleted ? null : noteResponse.categoryId,
+            isDirty: false,
           ),
         );
       } else {
@@ -286,15 +330,18 @@ class NoteRepository {
             .into(_database.notes)
             .insert(
               NotesCompanion(
-                uuid: Value(noteResponse.id),
+                id: Value(noteResponse.id),
                 title: Value(isPermanentlyDeleted ? '' : decryptedTitle),
                 body: Value(isPermanentlyDeleted ? '' : decryptedBody),
                 createdAt: Value(noteResponse.updatedAt),
                 updatedAt: Value(noteResponse.updatedAt),
-                sortIndex: Value(noteResponse.position),
+                sortIndex: Value(noteResponse.position.round()),
                 serverVersion: Value(noteResponse.serverVersion),
                 isDeleted: Value(noteResponse.isDeleted),
-                categoryId: Value(isPermanentlyDeleted ? null : noteResponse.categoryId),
+                categoryId: Value(
+                  isPermanentlyDeleted ? null : noteResponse.categoryId,
+                ),
+                isDirty: const Value(false),
               ),
             );
       }
@@ -314,26 +361,16 @@ class NoteRepository {
   Note _fromDbNote(DbNote row) {
     return Note(
       id: row.id,
-      uuid: row.uuid,
       title: row.title,
       body: row.body,
       createdAt: row.createdAt,
       updatedAt: row.updatedAt,
-      index: row.sortIndex,
+      position: row.sortIndex.toDouble(),
       serverVersion: row.serverVersion,
       isDeleted: row.isDeleted,
       isPermanentlyDeleted: _isPermanentlyDeleted(row),
       categoryId: row.categoryId,
-    );
+      isDirty: row.isDirty,
-  }
-
-  Category _fromDbCategory(DbCategory row) {
-    return Category(
-      uuid: row.uuid,
-      encryptedName: row.encryptedName,
-      serverVersion: row.serverVersion,
-      isDeleted: row.isDeleted,
-      updatedAt: row.updatedAt,
     );
   }
 }
@@ -395,6 +432,35 @@ Future<List<SyncNotePayload>> _encryptNotesInParallel(
   return orderedPayloads.cast<SyncNotePayload>();
 }
 
+Future<List<SyncCategoryPayload>> _encryptCategories(
+  List<DbCategory> categories, {
+  required String masterKey,
+}) async {
+  final List<SyncCategoryPayload> payloads = [];
+
+  for (final DbCategory row in categories) {
+    final String encryptedName = row.encryptedName.isEmpty
+        ? ''
+        : await NoteEncryption.encryptNote(row.encryptedName, masterKey);
+
+    payloads.add(
+      SyncCategoryPayload.fromCategory(
+        Category(
+          id: row.id,
+          name: row.encryptedName,
+          serverVersion: row.serverVersion,
+          isDeleted: row.isDeleted,
+          updatedAt: row.updatedAt,
+          isDirty: row.isDirty,
+        ),
+        encryptedName: encryptedName,
+      ),
+    );
+  }
+
+  return payloads;
+}
+
 List<Future<List<Map<String, Object?>>>> _decryptNoteBatches(
   List<SyncNoteResponse> notes, {
   required String masterKey,
@@ -467,7 +533,7 @@ Map<String, Object?> _dbNoteToEncryptionInput(DbNote row, int index) {
 
   return <String, Object?>{
     'index': index,
-    'uuid': row.uuid,
+    'id': row.id,
     'title': row.title,
     'body': row.body,
     'createdAt': row.createdAt.toIso8601String(),
@@ -487,7 +553,7 @@ SyncNotePayload _syncNotePayloadFromEncryptionResult(Map<String, Object?> row) {
     encryptedTitle: row['encryptedTitle']! as String,
     encryptedBody: row['encryptedBody']! as String,
     serverVersion: row['serverVersion']! as int,
-    position: row['position']! as int,
+    position: (row['position']! as num).toDouble(),
     isDeleted: row['isDeleted']! as bool,
     isPermanentlyDeleted: row['isPermanentlyDeleted']! as bool,
     updatedAt: DateTime.parse(row['updatedAt']! as String),
@@ -513,19 +579,13 @@ Future<List<Map<String, Object?>>> _encryptNoteBatch(
       encryptedTitle = '';
       encryptedBody = '';
     } else {
-      encryptedTitle = await NoteEncryption.encryptNote(
+      encryptedTitle = await NoteEncryption.encryptNote(title, masterKey);
-        title,
+      encryptedBody = await NoteEncryption.encryptNote(body, masterKey);
-        masterKey,
-      );
-      encryptedBody = await NoteEncryption.encryptNote(
-        body,
-        masterKey,
-      );
     }
 
     encryptedNotes.add(<String, Object?>{
       'index': note['index'] as int,
-      'id': note['uuid'] as String,
+      'id': note['id'] as String,
       'categoryId': note['categoryId'] as String?,
       'encryptedTitle': encryptedTitle,
       'encryptedBody': encryptedBody,
@@ -570,9 +630,11 @@ Future<List<Map<String, Object?>>> _decryptNoteBatch(
       decryptedBody = '';
     }
 
+    final String noteId = note['id']! as String;
+
     decryptedNotes.add(<String, Object?>{
       'index': note['index'] as int,
-      'id': note['id'] as String,
+      'id': noteId,
       'title': decryptedTitle,
       'body': decryptedBody,
       'isPermanentlyDeleted': isPermanentlyDeleted,

lib/data/sync_models.dart

@@ -98,16 +98,19 @@ class SyncCategoryPayload {
     required this.updatedAt,
   });
 
-  final String id; // uuid
+  final String id;
   final String encryptedName;
   final int serverVersion;
   final bool isDeleted;
   final DateTime updatedAt;
 
-  factory SyncCategoryPayload.fromCategory(Category category) {
+  factory SyncCategoryPayload.fromCategory(
+    Category category, {
+    required String encryptedName,
+  }) {
     return SyncCategoryPayload(
-      id: category.uuid,
+      id: category.id,
-      encryptedName: category.encryptedName,
+      encryptedName: encryptedName,
       serverVersion: category.serverVersion,
       isDeleted: category.isDeleted,
       updatedAt: category.updatedAt,
@@ -132,18 +135,18 @@ class SyncNotePayload {
     required this.encryptedTitle,
     required this.encryptedBody,
     required this.serverVersion,
-    this.position = 0,
+    this.position = 0.0,
     this.isDeleted = false,
     this.isPermanentlyDeleted = false,
     required this.updatedAt,
   });
 
-  final String id; // uuid
+  final String id;
   final String? categoryId;
   final String encryptedTitle;
   final String encryptedBody;
   final int serverVersion;
-  final int position;
+  final double position;
   final bool isDeleted;
   final bool isPermanentlyDeleted;
   final DateTime updatedAt;
@@ -155,12 +158,12 @@ class SyncNotePayload {
     bool isPermanentlyDeleted = false,
   }) {
     return SyncNotePayload(
-      id: note.uuid,
+      id: note.id,
       categoryId: note.categoryId,
       encryptedTitle: encryptedTitle,
       encryptedBody: encryptedBody,
       serverVersion: note.serverVersion,
-      position: note.index,
+      position: note.position,
       isDeleted: note.isDeleted,
       isPermanentlyDeleted: isPermanentlyDeleted,
       updatedAt: note.updatedAt,
@@ -212,8 +215,7 @@ class SyncCategoryResponse {
     this.isDeleted = false,
     required this.updatedAt,
   });
-
+  final String id;
-  final String id; // uuid
   final String encryptedName;
   final int serverVersion;
   final bool isDeleted;
@@ -229,10 +231,10 @@ class SyncCategoryResponse {
     );
   }
 
-  Category toCategory() {
+  Category toCategory({required String name}) {
     return Category(
-      uuid: id,
+      id: id,
-      encryptedName: encryptedName,
+      name: name,
       serverVersion: serverVersion,
       isDeleted: isDeleted,
       updatedAt: updatedAt,
@@ -247,18 +249,17 @@ class SyncNoteResponse {
     required this.encryptedTitle,
     required this.encryptedBody,
     required this.serverVersion,
-    this.position = 0,
+    this.position = 0.0,
     this.isDeleted = false,
     this.isPermanentlyDeleted = false,
     required this.updatedAt,
   });
-
+  final String id;
-  final String id; // uuid
   final String? categoryId;
   final String encryptedTitle;
   final String encryptedBody;
   final int serverVersion;
-  final int position;
+  final double position;
   final bool isDeleted;
   final bool isPermanentlyDeleted;
   final DateTime updatedAt;
@@ -272,7 +273,7 @@ class SyncNoteResponse {
       encryptedTitle: _readOptionalStringValue(json['encrypted_title']),
       encryptedBody: _readOptionalStringValue(json['encrypted_body']),
       serverVersion: _readIntValue(json['serverVersion']),
-      position: json['position'] as int? ?? 0,
+      position: (json['position'] as num?)?.toDouble() ?? 0,
       isDeleted: json['isDeleted'] as bool? ?? false,
       isPermanentlyDeleted: json['isPermanentlyDeleted'] as bool? ?? false,
       updatedAt: DateTime.parse(json['updatedAt'] as String),
@@ -281,15 +282,16 @@ class SyncNoteResponse {
 
   Note toNote() {
     return Note(
-      uuid: id,
+      id: id,
       title: isPermanentlyDeleted ? '' : 'Encrypted',
       body: isPermanentlyDeleted ? '' : 'Encrypted',
       createdAt: updatedAt,
       updatedAt: updatedAt,
-      index: position,
+      position: position,
       serverVersion: serverVersion,
       isDeleted: isDeleted,
       categoryId: categoryId,
+      isDirty: false,
     );
   }
 }

lib/models/category.dart

@@ -2,32 +2,36 @@ import 'package:uuid/uuid.dart';
 
 class Category {
   Category({
-    String? uuid,
+    String? id,
-    required this.encryptedName,
+    required this.name,
     this.serverVersion = 0,
     this.isDeleted = false,
     required this.updatedAt,
-  }) : uuid = uuid ?? Uuid().v4();
+    this.isDirty = true,
+  }) : id = id ?? Uuid().v4();
 
-  final String uuid;
+  final String id;
-  final String encryptedName;
+  final String name;
   final int serverVersion;
   final bool isDeleted;
   final DateTime updatedAt;
+  final bool isDirty;
 
   Category copyWith({
-    String? uuid,
+    String? id,
-    String? encryptedName,
+    String? name,
     int? serverVersion,
     bool? isDeleted,
     DateTime? updatedAt,
+    bool? isDirty,
   }) {
     return Category(
-      uuid: uuid ?? this.uuid,
+      id: id ?? this.id,
-      encryptedName: encryptedName ?? this.encryptedName,
+      name: name ?? this.name,
       serverVersion: serverVersion ?? this.serverVersion,
       isDeleted: isDeleted ?? this.isDeleted,
       updatedAt: updatedAt ?? this.updatedAt,
+      isDirty: isDirty ?? this.isDirty,
     );
   }
 
@@ -37,9 +41,9 @@ class Category {
       return true;
     }
 
-    return other is Category && uuid == other.uuid;
+    return other is Category && id == other.id;
   }
 
   @override
-  int get hashCode => uuid.hashCode;
+  int get hashCode => id.hashCode;
 }

lib/models/note.dart

@@ -2,63 +2,58 @@ import 'package:uuid/uuid.dart';
 
 // Model: Note
 // - Representa una nota guardada en la app.
-// - `id` es el identificador local de SQLite (autoincrement).
-// - `uuid` es el identificador global sincronizado con el servidor.
-// - `index` representa el orden visual dentro de la lista.
-// - `serverVersion` se usa para resolver conflictos en sync.
-// - `isDeleted` marca eliminaciones blandas.
 class Note {
   Note({
-    this.id,
+    String? id,
-    String? uuid,
     required this.title,
     required this.body,
     required this.createdAt,
     required this.updatedAt,
-    required this.index,
+    required this.position,
+    this.categoryId,
     this.serverVersion = 0,
     this.isDeleted = false,
     this.isPermanentlyDeleted = false,
-    this.categoryId,
+    this.isDirty = true,
-  }) : uuid = uuid ?? Uuid().v4();
+  }) : id = id ?? Uuid().v4();
 
-  final int? id;
+  final String id;
-  final String uuid;
   final String title;
   final String body;
   final DateTime createdAt;
   final DateTime updatedAt;
-  final int index;
+  final double position;
+  final String? categoryId;
   final int serverVersion;
   final bool isDeleted;
   final bool isPermanentlyDeleted;
-  final String? categoryId;
+  final bool isDirty;
 
   Note copyWith({
-    int? id,
+    String? id,
-    String? uuid,
     String? title,
     String? body,
     DateTime? createdAt,
     DateTime? updatedAt,
-    int? index,
+    double? position,
+    String? categoryId,
     int? serverVersion,
     bool? isDeleted,
     bool? isPermanentlyDeleted,
-    String? categoryId,
+    bool? isDirty,
   }) {
     return Note(
       id: id ?? this.id,
-      uuid: uuid ?? this.uuid,
       title: title ?? this.title,
       body: body ?? this.body,
       createdAt: createdAt ?? this.createdAt,
       updatedAt: updatedAt ?? this.updatedAt,
-      index: index ?? this.index,
+      position: position ?? this.position,
+      categoryId: categoryId ?? this.categoryId,
       serverVersion: serverVersion ?? this.serverVersion,
       isDeleted: isDeleted ?? this.isDeleted,
       isPermanentlyDeleted: isPermanentlyDeleted ?? this.isPermanentlyDeleted,
-      categoryId: categoryId ?? this.categoryId,
+      isDirty: isDirty ?? this.isDirty,
     );
   }
 
@@ -68,9 +63,9 @@ class Note {
       return true;
     }
 
-    return other is Note && uuid == other.uuid;
+    return other is Note && id == other.id;
   }
 
   @override
-  int get hashCode => uuid.hashCode;
+  int get hashCode => id.hashCode;
 }

lib/screens/home_screen.dart

@@ -154,9 +154,9 @@ class _HomeScreenState extends State<HomeScreen> {
       // Don't let DB errors cause the app to reset the vault automatically.
       debugPrint('Failed to move note: $e\n$st');
       if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
+      ScaffoldMessenger.of(
-        SnackBar(content: Text('Error al reordenar la nota: $e')),
+        context,
-      );
+      ).showSnackBar(SnackBar(content: Text('Error al reordenar la nota: $e')));
     }
   }
 
@@ -385,9 +385,8 @@ class _HomeScreenState extends State<HomeScreen> {
                                       borderRadius: BorderRadius.circular(12),
                                     ),
                                     child: NoteCard(
-                                      key: ValueKey<int>(
+                                      key: ValueKey<String>(
-                                        filteredNotes[index].id ??
+                                        filteredNotes[index].id,
-                                            filteredNotes[index].index,
                                       ),
                                       note: filteredNotes[index],
                                       onTap: () =>
@@ -510,9 +509,8 @@ class _HomeScreenState extends State<HomeScreen> {
                                       borderRadius: BorderRadius.circular(12),
                                     ),
                                     child: NoteCard(
-                                      key: ValueKey<int>(
+                                      key: ValueKey<String>(
-                                        filteredNotes[index].id ??
+                                        filteredNotes[index].id,
-                                            filteredNotes[index].index,
                                       ),
                                       note: filteredNotes[index],
                                       onTap: () =>

lib/screens/note_editor_screen.dart

@@ -89,7 +89,7 @@ class _NoteEditorScreenState extends State<NoteEditorScreen> {
   @override
   void initState() {
     super.initState();
-    _isNewNote = widget.note?.id == null;
+    _isNewNote = widget.note == null;
 
     if (_isNewNote) {
       final DateTime now = DateTime.now();
@@ -98,7 +98,7 @@ class _NoteEditorScreenState extends State<NoteEditorScreen> {
         body: '',
         createdAt: now,
         updatedAt: now,
-        index: 0,
+        position: 0,
       );
     } else {
       _currentNote = widget.note!;
@@ -143,6 +143,7 @@ class _NoteEditorScreenState extends State<NoteEditorScreen> {
       title: title.isEmpty ? 'Sin título' : title,
       body: body,
       updatedAt: DateTime.now(),
+      isDirty: true,
     );
 
     _complete(updatedNote);