diff --git a/lib/models/bucket.dart b/lib/models/bucket.dart
index 1e06857..09055dd 100644
--- a/lib/models/bucket.dart
+++ b/lib/models/bucket.dart
@@ -14,7 +14,7 @@ class Bucket {
   final List<Task> tasks;
 
   Bucket({
-    this.id = -1,
+    this.id = 0,
     required this.listId,
     required this.title,
     this.position,
@@ -47,7 +47,7 @@ class Bucket {
                 .toList();
 
   toJSON() => {
-    'id': id != -1 ? id : null,
+    'id': id,
     'list_id': listId,
     'title': title,
     'position': position,
diff --git a/lib/models/label.dart b/lib/models/label.dart
index 6c0f153..ee09525 100644
--- a/lib/models/label.dart
+++ b/lib/models/label.dart
@@ -13,7 +13,7 @@ class Label {
   late final Color textColor = color != null && color!.computeLuminance() <= 0.5 ? vLabelLight : vLabelDark;
 
   Label({
-    this.id = -1,
+    this.id = 0,
     required this.title,
     this.description = '',
     this.color,
@@ -35,7 +35,7 @@ class Label {
         createdBy = User.fromJson(json['created_by']);
 
   toJSON() => {
-        'id': id != -1 ? id : null,
+        'id': id,
         'title': title,
         'description': description,
         'hex_color':
diff --git a/lib/models/list.dart b/lib/models/list.dart
index 176c263..7acdbd1 100644
--- a/lib/models/list.dart
+++ b/lib/models/list.dart
@@ -11,7 +11,7 @@ class TaskList {
   final bool isFavorite;
 
   TaskList({
-    this.id = -1,
+    this.id = 0,
     required this.title,
     required this.namespaceId,
     this.description = '',
@@ -39,7 +39,7 @@ class TaskList {
 
   toJSON() {
     return {
-      'id': id != -1 ? id : null,
+      'id': id,
       'title': title,
       'description': description,
       'owner': owner.toJSON(),
diff --git a/lib/models/namespace.dart b/lib/models/namespace.dart
index 78f601c..cae149a 100644
--- a/lib/models/namespace.dart
+++ b/lib/models/namespace.dart
@@ -7,7 +7,7 @@ class Namespace {
   final User owner;
 
   Namespace({
-    this.id = -1,
+    this.id = 0,
     DateTime? created,
     DateTime? updated,
     required this.title,
@@ -25,7 +25,7 @@ class Namespace {
         owner = User.fromJson(json['owner']);
 
   Map<String, dynamic> toJSON() => {
-        'id': id != -1 ? id : null,
+        'id': id,
         'created': created.toUtc().toIso8601String(),
         'updated': updated.toUtc().toIso8601String(),
         'title': title,
diff --git a/lib/models/task.dart b/lib/models/task.dart
index 45621fd..4724146 100644
--- a/lib/models/task.dart
+++ b/lib/models/task.dart
@@ -32,7 +32,7 @@ class Task {
   late final hasDueDate = dueDate?.year != 1;
 
   Task({
-    this.id = -1,
+    this.id = 0,
     this.identifier = '',
     this.title = '',
     this.description = '',
@@ -104,7 +104,7 @@ class Task {
         createdBy = User.fromJson(json['created_by']);
 
   toJSON() => {
-        'id': id != -1 ? id : null,
+        'id': id,
         'title': title,
         'description': description,
         'identifier': identifier.isNotEmpty ? identifier : null,
diff --git a/lib/models/taskAttachment.dart b/lib/models/taskAttachment.dart
index b43eaf1..b0c6cdc 100644
--- a/lib/models/taskAttachment.dart
+++ b/lib/models/taskAttachment.dart
@@ -10,7 +10,7 @@ class TaskAttachment {
   // TODO: add file
 
   TaskAttachment({
-    this.id = -1,
+    this.id = 0,
     required this.taskId,
     DateTime? created,
     required this.createdBy,
@@ -23,7 +23,7 @@ class TaskAttachment {
         createdBy = User.fromJson(json['created_by']);
 
   toJSON() => {
-    'id': id != -1 ? id : null,
+    'id': id,
     'task_id': taskId,
     'created': created.toUtc().toIso8601String(),
     'created_by': createdBy.toJSON(),
diff --git a/lib/models/user.dart b/lib/models/user.dart
index c0dc080..fb50549 100644
--- a/lib/models/user.dart
+++ b/lib/models/user.dart
@@ -7,7 +7,7 @@ class User {
   final DateTime created, updated;
 
   User({
-    this.id = -1,
+    this.id = 0,
     this.name = '',
     required this.username,
     DateTime? created,
@@ -23,7 +23,7 @@ class User {
         updated = DateTime.parse(json['updated']);
 
   toJSON() => {
-        'id': id != -1 ? id : null,
+        'id': id,
         'name': name,
         'username': username,
         'created': created.toUtc().toIso8601String(),