diff --git a/backend-dart/lib/application/repository/user_repository_impl.dart b/backend-dart/lib/application/repository/user_repository_impl.dart
index 7635f98..4e8a76f 100755
--- a/backend-dart/lib/application/repository/user_repository_impl.dart
+++ b/backend-dart/lib/application/repository/user_repository_impl.dart
@@ -1,5 +1,5 @@
 import 'package:backend_dart/domain/entities/user.dart';
-import 'package:backend_dart/domain/interface/database.dart';
+import 'package:backend_dart/domain/data/database.dart';
 import 'package:backend_dart/domain/interface/error.dart';
 import 'package:backend_dart/domain/repository/user_repository.dart';
 import 'package:fpdart/fpdart.dart';
@@ -9,7 +9,7 @@ class UserRepositoryImpl implements UserRepository {
   UserRepositoryImpl(this.database);
 
   @override
-  TaskEither<IError, User> create(User user) {
+  TaskEither<IError, User> create(UserCreate user) {
     return database.users
         .generateId()
         .map(
@@ -29,7 +29,7 @@ class UserRepositoryImpl implements UserRepository {
   }
 
   @override
-  TaskEither<IError, User> update(User user) {
+  TaskEither<IError, User> update(UserUpdate user) {
     return database.users.update(user);
   }
 
diff --git a/backend-dart/lib/application/service/dto/user_dto.dart b/backend-dart/lib/application/service/dto/user_dto.dart
index 27ca162..e1dfb7a 100644
--- a/backend-dart/lib/application/service/dto/user_dto.dart
+++ b/backend-dart/lib/application/service/dto/user_dto.dart
@@ -6,15 +6,39 @@ part 'user_dto.g.dart';
 @freezed
 class UserDto with _$UserDto {
   const factory UserDto({
-    String? id,
-    String? name,
-    String? email,
-    String? password,
+    required String id,
+    required String name,
+    required String email,
     DateTime? createdAt,
     DateTime? updatedAt,
   }) = _UserDto;
 
   /// JSON-Serialisierung
-  factory UserDto.fromJson(Map<String, dynamic> json) =>
-      _$UserDtoFromJson(json);
+  factory UserDto.fromJson(Map<String, dynamic> json) => _$UserDtoFromJson(json);
+}
+
+@freezed
+class UserCreateDto with _$UserCreateDto {
+  const factory UserCreateDto({
+    required String name,
+    required String email,
+    required String password,
+  }) = _UserCreateDto;
+
+  /// JSON-Serialisierung
+  factory UserCreateDto.fromJson(Map<String, dynamic> json) =>
+      _$UserCreateDtoFromJson(json);
+}
+
+@freezed
+class UserUpdateDto with _$UserUpdateDto {
+  const factory UserUpdateDto({
+    String? name,
+    String? email,
+    String? password,
+  }) = _UserUpdateDto;
+
+  /// JSON-Serialisierung
+  factory UserUpdateDto.fromJson(Map<String, dynamic> json) =>
+      _$UserUpdateDtoFromJson(json);
 }
diff --git a/backend-dart/lib/application/service/dto/user_dto.freezed.dart b/backend-dart/lib/application/service/dto/user_dto.freezed.dart
index 867047b..523111b 100644
--- a/backend-dart/lib/application/service/dto/user_dto.freezed.dart
+++ b/backend-dart/lib/application/service/dto/user_dto.freezed.dart
@@ -20,10 +20,9 @@ UserDto _$UserDtoFromJson(Map<String, dynamic> json) {
 
 /// @nodoc
 mixin _$UserDto {
-  String? get id => throw _privateConstructorUsedError;
-  String? get name => throw _privateConstructorUsedError;
-  String? get email => throw _privateConstructorUsedError;
-  String? get password => throw _privateConstructorUsedError;
+  String get id => throw _privateConstructorUsedError;
+  String get name => throw _privateConstructorUsedError;
+  String get email => throw _privateConstructorUsedError;
   DateTime? get createdAt => throw _privateConstructorUsedError;
   DateTime? get updatedAt => throw _privateConstructorUsedError;
 
@@ -42,10 +41,9 @@ abstract class $UserDtoCopyWith<$Res> {
       _$UserDtoCopyWithImpl<$Res, UserDto>;
   @useResult
   $Res call(
-      {String? id,
-      String? name,
-      String? email,
-      String? password,
+      {String id,
+      String name,
+      String email,
       DateTime? createdAt,
       DateTime? updatedAt});
 }
@@ -65,30 +63,25 @@ class _$UserDtoCopyWithImpl<$Res, $Val extends UserDto>
   @pragma('vm:prefer-inline')
   @override
   $Res call({
-    Object? id = freezed,
-    Object? name = freezed,
-    Object? email = freezed,
-    Object? password = freezed,
+    Object? id = null,
+    Object? name = null,
+    Object? email = null,
     Object? createdAt = freezed,
     Object? updatedAt = freezed,
   }) {
     return _then(_value.copyWith(
-      id: freezed == id
+      id: null == id
           ? _value.id
           : id // ignore: cast_nullable_to_non_nullable
-              as String?,
-      name: freezed == name
+              as String,
+      name: null == name
           ? _value.name
           : name // ignore: cast_nullable_to_non_nullable
-              as String?,
-      email: freezed == email
+              as String,
+      email: null == email
           ? _value.email
           : email // ignore: cast_nullable_to_non_nullable
-              as String?,
-      password: freezed == password
-          ? _value.password
-          : password // ignore: cast_nullable_to_non_nullable
-              as String?,
+              as String,
       createdAt: freezed == createdAt
           ? _value.createdAt
           : createdAt // ignore: cast_nullable_to_non_nullable
@@ -109,10 +102,9 @@ abstract class _$$UserDtoImplCopyWith<$Res> implements $UserDtoCopyWith<$Res> {
   @override
   @useResult
   $Res call(
-      {String? id,
-      String? name,
-      String? email,
-      String? password,
+      {String id,
+      String name,
+      String email,
       DateTime? createdAt,
       DateTime? updatedAt});
 }
@@ -130,30 +122,25 @@ class __$$UserDtoImplCopyWithImpl<$Res>
   @pragma('vm:prefer-inline')
   @override
   $Res call({
-    Object? id = freezed,
-    Object? name = freezed,
-    Object? email = freezed,
-    Object? password = freezed,
+    Object? id = null,
+    Object? name = null,
+    Object? email = null,
     Object? createdAt = freezed,
     Object? updatedAt = freezed,
   }) {
     return _then(_$UserDtoImpl(
-      id: freezed == id
+      id: null == id
           ? _value.id
           : id // ignore: cast_nullable_to_non_nullable
-              as String?,
-      name: freezed == name
+              as String,
+      name: null == name
           ? _value.name
           : name // ignore: cast_nullable_to_non_nullable
-              as String?,
-      email: freezed == email
+              as String,
+      email: null == email
           ? _value.email
           : email // ignore: cast_nullable_to_non_nullable
-              as String?,
-      password: freezed == password
-          ? _value.password
-          : password // ignore: cast_nullable_to_non_nullable
-              as String?,
+              as String,
       createdAt: freezed == createdAt
           ? _value.createdAt
           : createdAt // ignore: cast_nullable_to_non_nullable
@@ -170,10 +157,9 @@ class __$$UserDtoImplCopyWithImpl<$Res>
 @JsonSerializable()
 class _$UserDtoImpl implements _UserDto {
   const _$UserDtoImpl(
-      {this.id,
-      this.name,
-      this.email,
-      this.password,
+      {required this.id,
+      required this.name,
+      required this.email,
       this.createdAt,
       this.updatedAt});
 
@@ -181,13 +167,11 @@ class _$UserDtoImpl implements _UserDto {
       _$$UserDtoImplFromJson(json);
 
   @override
-  final String? id;
+  final String id;
   @override
-  final String? name;
+  final String name;
   @override
-  final String? email;
-  @override
-  final String? password;
+  final String email;
   @override
   final DateTime? createdAt;
   @override
@@ -195,7 +179,7 @@ class _$UserDtoImpl implements _UserDto {
 
   @override
   String toString() {
-    return 'UserDto(id: $id, name: $name, email: $email, password: $password, createdAt: $createdAt, updatedAt: $updatedAt)';
+    return 'UserDto(id: $id, name: $name, email: $email, createdAt: $createdAt, updatedAt: $updatedAt)';
   }
 
   @override
@@ -206,8 +190,6 @@ class _$UserDtoImpl implements _UserDto {
             (identical(other.id, id) || other.id == id) &&
             (identical(other.name, name) || other.name == name) &&
             (identical(other.email, email) || other.email == email) &&
-            (identical(other.password, password) ||
-                other.password == password) &&
             (identical(other.createdAt, createdAt) ||
                 other.createdAt == createdAt) &&
             (identical(other.updatedAt, updatedAt) ||
@@ -217,7 +199,7 @@ class _$UserDtoImpl implements _UserDto {
   @JsonKey(includeFromJson: false, includeToJson: false)
   @override
   int get hashCode =>
-      Object.hash(runtimeType, id, name, email, password, createdAt, updatedAt);
+      Object.hash(runtimeType, id, name, email, createdAt, updatedAt);
 
   /// Create a copy of UserDto
   /// with the given fields replaced by the non-null parameter values.
@@ -237,23 +219,20 @@ class _$UserDtoImpl implements _UserDto {
 
 abstract class _UserDto implements UserDto {
   const factory _UserDto(
-      {final String? id,
-      final String? name,
-      final String? email,
-      final String? password,
+      {required final String id,
+      required final String name,
+      required final String email,
       final DateTime? createdAt,
       final DateTime? updatedAt}) = _$UserDtoImpl;
 
   factory _UserDto.fromJson(Map<String, dynamic> json) = _$UserDtoImpl.fromJson;
 
   @override
-  String? get id;
+  String get id;
   @override
-  String? get name;
+  String get name;
   @override
-  String? get email;
-  @override
-  String? get password;
+  String get email;
   @override
   DateTime? get createdAt;
   @override
@@ -266,3 +245,374 @@ abstract class _UserDto implements UserDto {
   _$$UserDtoImplCopyWith<_$UserDtoImpl> get copyWith =>
       throw _privateConstructorUsedError;
 }
+
+UserCreateDto _$UserCreateDtoFromJson(Map<String, dynamic> json) {
+  return _UserCreateDto.fromJson(json);
+}
+
+/// @nodoc
+mixin _$UserCreateDto {
+  String get name => throw _privateConstructorUsedError;
+  String get email => throw _privateConstructorUsedError;
+  String get password => throw _privateConstructorUsedError;
+
+  /// Serializes this UserCreateDto to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of UserCreateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $UserCreateDtoCopyWith<UserCreateDto> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $UserCreateDtoCopyWith<$Res> {
+  factory $UserCreateDtoCopyWith(
+          UserCreateDto value, $Res Function(UserCreateDto) then) =
+      _$UserCreateDtoCopyWithImpl<$Res, UserCreateDto>;
+  @useResult
+  $Res call({String name, String email, String password});
+}
+
+/// @nodoc
+class _$UserCreateDtoCopyWithImpl<$Res, $Val extends UserCreateDto>
+    implements $UserCreateDtoCopyWith<$Res> {
+  _$UserCreateDtoCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of UserCreateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = null,
+    Object? email = null,
+    Object? password = null,
+  }) {
+    return _then(_value.copyWith(
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      email: null == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String,
+      password: null == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$UserCreateDtoImplCopyWith<$Res>
+    implements $UserCreateDtoCopyWith<$Res> {
+  factory _$$UserCreateDtoImplCopyWith(
+          _$UserCreateDtoImpl value, $Res Function(_$UserCreateDtoImpl) then) =
+      __$$UserCreateDtoImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String name, String email, String password});
+}
+
+/// @nodoc
+class __$$UserCreateDtoImplCopyWithImpl<$Res>
+    extends _$UserCreateDtoCopyWithImpl<$Res, _$UserCreateDtoImpl>
+    implements _$$UserCreateDtoImplCopyWith<$Res> {
+  __$$UserCreateDtoImplCopyWithImpl(
+      _$UserCreateDtoImpl _value, $Res Function(_$UserCreateDtoImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of UserCreateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = null,
+    Object? email = null,
+    Object? password = null,
+  }) {
+    return _then(_$UserCreateDtoImpl(
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      email: null == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String,
+      password: null == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$UserCreateDtoImpl implements _UserCreateDto {
+  const _$UserCreateDtoImpl(
+      {required this.name, required this.email, required this.password});
+
+  factory _$UserCreateDtoImpl.fromJson(Map<String, dynamic> json) =>
+      _$$UserCreateDtoImplFromJson(json);
+
+  @override
+  final String name;
+  @override
+  final String email;
+  @override
+  final String password;
+
+  @override
+  String toString() {
+    return 'UserCreateDto(name: $name, email: $email, password: $password)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$UserCreateDtoImpl &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.email, email) || other.email == email) &&
+            (identical(other.password, password) ||
+                other.password == password));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, name, email, password);
+
+  /// Create a copy of UserCreateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$UserCreateDtoImplCopyWith<_$UserCreateDtoImpl> get copyWith =>
+      __$$UserCreateDtoImplCopyWithImpl<_$UserCreateDtoImpl>(this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$UserCreateDtoImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _UserCreateDto implements UserCreateDto {
+  const factory _UserCreateDto(
+      {required final String name,
+      required final String email,
+      required final String password}) = _$UserCreateDtoImpl;
+
+  factory _UserCreateDto.fromJson(Map<String, dynamic> json) =
+      _$UserCreateDtoImpl.fromJson;
+
+  @override
+  String get name;
+  @override
+  String get email;
+  @override
+  String get password;
+
+  /// Create a copy of UserCreateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$UserCreateDtoImplCopyWith<_$UserCreateDtoImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+UserUpdateDto _$UserUpdateDtoFromJson(Map<String, dynamic> json) {
+  return _UserUpdateDto.fromJson(json);
+}
+
+/// @nodoc
+mixin _$UserUpdateDto {
+  String? get name => throw _privateConstructorUsedError;
+  String? get email => throw _privateConstructorUsedError;
+  String? get password => throw _privateConstructorUsedError;
+
+  /// Serializes this UserUpdateDto to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of UserUpdateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $UserUpdateDtoCopyWith<UserUpdateDto> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $UserUpdateDtoCopyWith<$Res> {
+  factory $UserUpdateDtoCopyWith(
+          UserUpdateDto value, $Res Function(UserUpdateDto) then) =
+      _$UserUpdateDtoCopyWithImpl<$Res, UserUpdateDto>;
+  @useResult
+  $Res call({String? name, String? email, String? password});
+}
+
+/// @nodoc
+class _$UserUpdateDtoCopyWithImpl<$Res, $Val extends UserUpdateDto>
+    implements $UserUpdateDtoCopyWith<$Res> {
+  _$UserUpdateDtoCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of UserUpdateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = freezed,
+    Object? email = freezed,
+    Object? password = freezed,
+  }) {
+    return _then(_value.copyWith(
+      name: freezed == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String?,
+      email: freezed == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String?,
+      password: freezed == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String?,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$UserUpdateDtoImplCopyWith<$Res>
+    implements $UserUpdateDtoCopyWith<$Res> {
+  factory _$$UserUpdateDtoImplCopyWith(
+          _$UserUpdateDtoImpl value, $Res Function(_$UserUpdateDtoImpl) then) =
+      __$$UserUpdateDtoImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String? name, String? email, String? password});
+}
+
+/// @nodoc
+class __$$UserUpdateDtoImplCopyWithImpl<$Res>
+    extends _$UserUpdateDtoCopyWithImpl<$Res, _$UserUpdateDtoImpl>
+    implements _$$UserUpdateDtoImplCopyWith<$Res> {
+  __$$UserUpdateDtoImplCopyWithImpl(
+      _$UserUpdateDtoImpl _value, $Res Function(_$UserUpdateDtoImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of UserUpdateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = freezed,
+    Object? email = freezed,
+    Object? password = freezed,
+  }) {
+    return _then(_$UserUpdateDtoImpl(
+      name: freezed == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String?,
+      email: freezed == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String?,
+      password: freezed == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String?,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$UserUpdateDtoImpl implements _UserUpdateDto {
+  const _$UserUpdateDtoImpl({this.name, this.email, this.password});
+
+  factory _$UserUpdateDtoImpl.fromJson(Map<String, dynamic> json) =>
+      _$$UserUpdateDtoImplFromJson(json);
+
+  @override
+  final String? name;
+  @override
+  final String? email;
+  @override
+  final String? password;
+
+  @override
+  String toString() {
+    return 'UserUpdateDto(name: $name, email: $email, password: $password)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$UserUpdateDtoImpl &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.email, email) || other.email == email) &&
+            (identical(other.password, password) ||
+                other.password == password));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, name, email, password);
+
+  /// Create a copy of UserUpdateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$UserUpdateDtoImplCopyWith<_$UserUpdateDtoImpl> get copyWith =>
+      __$$UserUpdateDtoImplCopyWithImpl<_$UserUpdateDtoImpl>(this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$UserUpdateDtoImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _UserUpdateDto implements UserUpdateDto {
+  const factory _UserUpdateDto(
+      {final String? name,
+      final String? email,
+      final String? password}) = _$UserUpdateDtoImpl;
+
+  factory _UserUpdateDto.fromJson(Map<String, dynamic> json) =
+      _$UserUpdateDtoImpl.fromJson;
+
+  @override
+  String? get name;
+  @override
+  String? get email;
+  @override
+  String? get password;
+
+  /// Create a copy of UserUpdateDto
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$UserUpdateDtoImplCopyWith<_$UserUpdateDtoImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
diff --git a/backend-dart/lib/application/service/dto/user_dto.g.dart b/backend-dart/lib/application/service/dto/user_dto.g.dart
index a71206c..01b59bf 100644
--- a/backend-dart/lib/application/service/dto/user_dto.g.dart
+++ b/backend-dart/lib/application/service/dto/user_dto.g.dart
@@ -8,10 +8,9 @@ part of 'user_dto.dart';
 
 _$UserDtoImpl _$$UserDtoImplFromJson(Map<String, dynamic> json) =>
     _$UserDtoImpl(
-      id: json['id'] as String?,
-      name: json['name'] as String?,
-      email: json['email'] as String?,
-      password: json['password'] as String?,
+      id: json['id'] as String,
+      name: json['name'] as String,
+      email: json['email'] as String,
       createdAt: json['createdAt'] == null
           ? null
           : DateTime.parse(json['createdAt'] as String),
@@ -25,7 +24,34 @@ Map<String, dynamic> _$$UserDtoImplToJson(_$UserDtoImpl instance) =>
       'id': instance.id,
       'name': instance.name,
       'email': instance.email,
-      'password': instance.password,
       'createdAt': instance.createdAt?.toIso8601String(),
       'updatedAt': instance.updatedAt?.toIso8601String(),
     };
+
+_$UserCreateDtoImpl _$$UserCreateDtoImplFromJson(Map<String, dynamic> json) =>
+    _$UserCreateDtoImpl(
+      name: json['name'] as String,
+      email: json['email'] as String,
+      password: json['password'] as String,
+    );
+
+Map<String, dynamic> _$$UserCreateDtoImplToJson(_$UserCreateDtoImpl instance) =>
+    <String, dynamic>{
+      'name': instance.name,
+      'email': instance.email,
+      'password': instance.password,
+    };
+
+_$UserUpdateDtoImpl _$$UserUpdateDtoImplFromJson(Map<String, dynamic> json) =>
+    _$UserUpdateDtoImpl(
+      name: json['name'] as String?,
+      email: json['email'] as String?,
+      password: json['password'] as String?,
+    );
+
+Map<String, dynamic> _$$UserUpdateDtoImplToJson(_$UserUpdateDtoImpl instance) =>
+    <String, dynamic>{
+      'name': instance.name,
+      'email': instance.email,
+      'password': instance.password,
+    };
diff --git a/backend-dart/lib/application/service/mapper/user_dto_mapper.dart b/backend-dart/lib/application/service/mapper/user_dto_mapper.dart
index 30a8d00..72e5315 100644
--- a/backend-dart/lib/application/service/mapper/user_dto_mapper.dart
+++ b/backend-dart/lib/application/service/mapper/user_dto_mapper.dart
@@ -18,7 +18,6 @@ class UserDtoMapper implements IMapper<User, UserDto> {
         id: dto.id,
         name: dto.name,
         email: dto.email,
-        password: dto.password,
         createdAt: dto.createdAt,
         updatedAt: dto.updatedAt,
       ));
@@ -32,4 +31,20 @@ class UserDtoMapper implements IMapper<User, UserDto> {
   TaskEither<IError, List<UserDto>> listTo(Iterable<User> origins) {
     return TaskEither.traverseList(origins.toList(), to);
   }
+
+  TaskEither<IError, UserCreate> fromCreateTo(UserCreateDto origin) =>
+      TaskEither.of(UserCreate(
+        name: origin.name,
+        email: origin.email,
+        password: origin.password,
+      ));
+
+  TaskEither<IError, UserUpdate> fromUpdateTo(
+          UserUpdateDto origin, String id) =>
+      TaskEither.of(UserUpdate(
+        id: id,
+        name: origin.name,
+        email: origin.email,
+        password: origin.password,
+      ));
 }
diff --git a/backend-dart/lib/application/service/user_service.dart b/backend-dart/lib/application/service/user_service.dart
index b825d97..c0cd0a8 100644
--- a/backend-dart/lib/application/service/user_service.dart
+++ b/backend-dart/lib/application/service/user_service.dart
@@ -2,11 +2,10 @@ import 'dart:convert';
 
 import 'package:backend_dart/application/service/dto/user_dto.dart';
 import 'package:backend_dart/application/service/mapper/user_dto_mapper.dart';
+import 'package:backend_dart/common/request_helper.dart';
 import 'package:backend_dart/common/response_helpers.dart';
-import 'package:backend_dart/domain/errors/app_error.dart';
-import 'package:backend_dart/domain/interface/error.dart';
+import 'package:backend_dart/common/validation.dart';
 import 'package:backend_dart/domain/repository/user_repository.dart';
-import 'package:fpdart/fpdart.dart';
 import 'package:shelf/shelf.dart';
 import 'package:shelf_router/shelf_router.dart';
 
@@ -40,15 +39,11 @@ class UserService {
 
   @Route.post('/')
   Future<Response> createUser(Request request) async {
-    return TaskEither<IError, UserDto>.tryCatch(() async {
-      final json = jsonDecode(await request.readAsString());
-      final user = UserDto.fromJson(json);
-      return user;
-    }, (error, stack) {
-      return AppError.inputError(
-          message: 'Failed to create user: ${error.toString()}');
-    })
-        .flatMap(mapper.from)
+    return requestToJson(request)
+        .flatMap(
+            (json) => validateJsonKeys(json, ['name', 'email', 'password']))
+        .flatMap((json) => decodeJson(json, UserCreateDto.fromJson))
+        .flatMap(mapper.fromCreateTo)
         .flatMap(users.create)
         .flatMap(mapper.to)
         .match((left) => ResponseHelpers.fromError(left),
@@ -58,15 +53,10 @@ class UserService {
 
   @Route.put('/<userId>')
   Future<Response> updateUser(Request request, String userId) async {
-    return TaskEither<IError, UserDto>.tryCatch(() async {
-      final json = jsonDecode(await request.readAsString());
-      final user = UserDto.fromJson(json);
-      return user;
-    }, (error, stack) {
-      return AppError.inputError(
-          message: 'Failed to update user: ${error.toString()}');
-    })
-        .flatMap(mapper.from)
+    return requestToJson(request)
+        .flatMap((json) => validateJsonKeys(json, []))
+        .flatMap((json) => decodeJson(json, UserUpdateDto.fromJson))
+        .flatMap((dto) => mapper.fromUpdateTo(dto, userId))
         .flatMap(users.update)
         .flatMap(mapper.to)
         .match((left) => ResponseHelpers.fromError(left),
diff --git a/backend-dart/lib/common/extensions.dart b/backend-dart/lib/common/extensions.dart
new file mode 100644
index 0000000..51fdd3a
--- /dev/null
+++ b/backend-dart/lib/common/extensions.dart
@@ -0,0 +1,8 @@
+extension Let<T> on T? {
+  R? let<R>(R Function(T it) action) {
+    if (this != null) {
+      return action(this!);
+    }
+    return null;
+  }
+}
diff --git a/backend-dart/lib/common/request_helper.dart b/backend-dart/lib/common/request_helper.dart
new file mode 100644
index 0000000..5689a5f
--- /dev/null
+++ b/backend-dart/lib/common/request_helper.dart
@@ -0,0 +1,31 @@
+import 'dart:convert';
+import 'dart:core';
+
+import 'package:backend_dart/domain/errors/app_error.dart';
+import 'package:backend_dart/domain/interface/error.dart';
+import 'package:fpdart/fpdart.dart';
+import 'package:shelf/shelf.dart';
+
+TaskEither<IError, Map<String, dynamic>> requestToJson(Request request) {
+  return TaskEither.tryCatch(
+    () async {
+      final body = await request.readAsString();
+      return jsonDecode(body);
+    },
+    (error, stack) => AppError.inputError(
+      message: 'Failed to decode JSON: ${error.toString()}',
+    ),
+  );
+}
+
+TaskEither<IError, T> decodeJson<T>(
+    Map<String, dynamic> json, T Function(Map<String, dynamic>) fromJson) {
+  return TaskEither.tryCatch(
+    () async {
+      return fromJson(json);
+    },
+    (error, stack) => AppError.inputError(
+      message: 'Failed to decode JSON: ${error.toString()}',
+    ),
+  );
+}
\ No newline at end of file
diff --git a/backend-dart/lib/common/secure_hash.dart b/backend-dart/lib/common/secure_hash.dart
new file mode 100644
index 0000000..016d0e0
--- /dev/null
+++ b/backend-dart/lib/common/secure_hash.dart
@@ -0,0 +1,10 @@
+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
+
+String generateSecureHash(String input) {
+  final bytes = utf8.encode(input);
+  final hash = sha256.convert(bytes);
+  print(hash);
+  return hash.toString();
+}
diff --git a/backend-dart/lib/common/validation.dart b/backend-dart/lib/common/validation.dart
new file mode 100644
index 0000000..1124e70
--- /dev/null
+++ b/backend-dart/lib/common/validation.dart
@@ -0,0 +1,22 @@
+import 'package:backend_dart/domain/errors/app_error.dart';
+import 'package:backend_dart/domain/interface/error.dart';
+import 'package:fpdart/fpdart.dart';
+
+TaskEither<IError, Map<String, dynamic>> validateJsonKeys(
+    Map<String, dynamic> json, List<String> requiredKeys) {
+  return TaskEither.tryCatch(
+    () async {
+      final missingKeys =
+          requiredKeys.where((key) => !json.containsKey(key)).toList();
+
+      if (missingKeys.isNotEmpty) {
+        throw Exception('Missing required keys: ${missingKeys.join(', ')}');
+      }
+
+      return json;
+    },
+    (error, _) => AppError.validationError(
+      message: 'Failed to validate JSON keys: ${error.toString()}',
+    ),
+  );
+}
diff --git a/backend-dart/lib/domain/interface/database.dart b/backend-dart/lib/domain/data/database.dart
similarity index 56%
rename from backend-dart/lib/domain/interface/database.dart
rename to backend-dart/lib/domain/data/database.dart
index 9e4781c..1d81e04 100644
--- a/backend-dart/lib/domain/interface/database.dart
+++ b/backend-dart/lib/domain/data/database.dart
@@ -1,7 +1,6 @@
 import 'package:backend_dart/domain/data/user_data_source.dart';
-import 'package:backend_dart/domain/entities/user.dart';
 
 abstract class IDatabase {
-  UserDataSource<User> get users;
+  UserDataSource get users;
   Future<void> close();
 }
diff --git a/backend-dart/lib/domain/data/project_data_source.dart b/backend-dart/lib/domain/data/project_data_source.dart
new file mode 100644
index 0000000..c20da8e
--- /dev/null
+++ b/backend-dart/lib/domain/data/project_data_source.dart
@@ -0,0 +1,34 @@
+import 'package:backend_dart/domain/entities/project.dart';
+
+/// Interface for managing project data interactions.
+abstract class ProjectDataSource {
+  /// Creates a new project in the data source.
+  ///
+  /// Throws an error if the creation fails.
+  Future<void> createProject(NewProject project);
+
+  /// Retrieves a project by its unique ID.
+  ///
+  /// Returns `null` if no project is found.
+  Future<Project?> findProjectById(String id);
+
+  /// Retrieves all projects associated with a specific user.
+  ///
+  /// Returns an empty list if no projects are found.
+  Future<List<Project>> findProjectsByUserId(String userId);
+
+  /// Updates an existing project in the data source.
+  ///
+  /// Throws an error if the update fails.
+  Future<void> updateProject(ProjectUpdate project);
+
+  /// Deletes a project by its unique ID.
+  ///
+  /// Throws an error if the deletion fails.
+  Future<void> deleteProject(String id);
+
+  /// Retrieves all projects in the data source.
+  ///
+  /// Returns an empty list if no projects exist.
+  Future<List<Project>> findAllProjects();
+}
diff --git a/backend-dart/lib/domain/data/user_data_source.dart b/backend-dart/lib/domain/data/user_data_source.dart
index f14aaa7..cb05b07 100644
--- a/backend-dart/lib/domain/data/user_data_source.dart
+++ b/backend-dart/lib/domain/data/user_data_source.dart
@@ -1,18 +1,19 @@
+import 'package:backend_dart/domain/entities/user.dart';
 import 'package:backend_dart/domain/interface/error.dart';
 import 'package:fpdart/fpdart.dart';
 
-abstract class UserDataSource<T> {
-  TaskEither<IError, T> create(T user);
+abstract class UserDataSource {
+  TaskEither<IError, User> create(UserCreate user);
 
-  TaskEither<IError, T> findByEmail(String email);
+  TaskEither<IError, User> findByEmail(String email);
 
-  TaskEither<IError, T> findById(String id);
+  TaskEither<IError, User> findById(String id);
 
-  TaskEither<IError, T> update(T user);
+  TaskEither<IError, User> update(UserUpdate user);
 
   TaskEither<IError, void> delete(String id);
 
-  TaskEither<IError, List<T>> findAll();
+  TaskEither<IError, List<User>> findAll();
 
-  TaskEither<IError,String> generateId();
+  TaskEither<IError, String> generateId();
 }
diff --git a/backend-dart/lib/domain/entities/project.dart b/backend-dart/lib/domain/entities/project.dart
new file mode 100644
index 0000000..167f33a
--- /dev/null
+++ b/backend-dart/lib/domain/entities/project.dart
@@ -0,0 +1,36 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'project.freezed.dart';
+
+@freezed
+class NewProject with _$NewProject {
+  const factory NewProject({
+    required String name,
+    String? description,
+    String? clientId,
+    required String userId,
+  }) = _NewProject;
+}
+
+@freezed
+class Project with _$Project {
+  const factory Project({
+    required String id,
+    required String name,
+    String? description,
+    String? clientId,
+    required String userId,
+    required DateTime createdAt,
+    required DateTime updatedAt,
+  }) = _Project;
+}
+
+@freezed
+class ProjectUpdate with _$ProjectUpdate {
+  const factory ProjectUpdate({
+    String? name,
+    String? description,
+    String? clientId,
+    String? userId,
+  }) = _ProjectUpdate;
+}
diff --git a/backend-dart/lib/domain/entities/project.freezed.dart b/backend-dart/lib/domain/entities/project.freezed.dart
new file mode 100644
index 0000000..9a412de
--- /dev/null
+++ b/backend-dart/lib/domain/entities/project.freezed.dart
@@ -0,0 +1,644 @@
+// coverage:ignore-file
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'project.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+T _$identity<T>(T value) => value;
+
+final _privateConstructorUsedError = UnsupportedError(
+    'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#adding-getters-and-methods-to-our-models');
+
+/// @nodoc
+mixin _$NewProject {
+  String get name => throw _privateConstructorUsedError;
+  String? get description => throw _privateConstructorUsedError;
+  String? get clientId => throw _privateConstructorUsedError;
+  String get userId => throw _privateConstructorUsedError;
+
+  /// Create a copy of NewProject
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $NewProjectCopyWith<NewProject> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $NewProjectCopyWith<$Res> {
+  factory $NewProjectCopyWith(
+          NewProject value, $Res Function(NewProject) then) =
+      _$NewProjectCopyWithImpl<$Res, NewProject>;
+  @useResult
+  $Res call(
+      {String name, String? description, String? clientId, String userId});
+}
+
+/// @nodoc
+class _$NewProjectCopyWithImpl<$Res, $Val extends NewProject>
+    implements $NewProjectCopyWith<$Res> {
+  _$NewProjectCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of NewProject
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = null,
+    Object? description = freezed,
+    Object? clientId = freezed,
+    Object? userId = null,
+  }) {
+    return _then(_value.copyWith(
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      description: freezed == description
+          ? _value.description
+          : description // ignore: cast_nullable_to_non_nullable
+              as String?,
+      clientId: freezed == clientId
+          ? _value.clientId
+          : clientId // ignore: cast_nullable_to_non_nullable
+              as String?,
+      userId: null == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$NewProjectImplCopyWith<$Res>
+    implements $NewProjectCopyWith<$Res> {
+  factory _$$NewProjectImplCopyWith(
+          _$NewProjectImpl value, $Res Function(_$NewProjectImpl) then) =
+      __$$NewProjectImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call(
+      {String name, String? description, String? clientId, String userId});
+}
+
+/// @nodoc
+class __$$NewProjectImplCopyWithImpl<$Res>
+    extends _$NewProjectCopyWithImpl<$Res, _$NewProjectImpl>
+    implements _$$NewProjectImplCopyWith<$Res> {
+  __$$NewProjectImplCopyWithImpl(
+      _$NewProjectImpl _value, $Res Function(_$NewProjectImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of NewProject
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = null,
+    Object? description = freezed,
+    Object? clientId = freezed,
+    Object? userId = null,
+  }) {
+    return _then(_$NewProjectImpl(
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      description: freezed == description
+          ? _value.description
+          : description // ignore: cast_nullable_to_non_nullable
+              as String?,
+      clientId: freezed == clientId
+          ? _value.clientId
+          : clientId // ignore: cast_nullable_to_non_nullable
+              as String?,
+      userId: null == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$NewProjectImpl implements _NewProject {
+  const _$NewProjectImpl(
+      {required this.name,
+      this.description,
+      this.clientId,
+      required this.userId});
+
+  @override
+  final String name;
+  @override
+  final String? description;
+  @override
+  final String? clientId;
+  @override
+  final String userId;
+
+  @override
+  String toString() {
+    return 'NewProject(name: $name, description: $description, clientId: $clientId, userId: $userId)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$NewProjectImpl &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.description, description) ||
+                other.description == description) &&
+            (identical(other.clientId, clientId) ||
+                other.clientId == clientId) &&
+            (identical(other.userId, userId) || other.userId == userId));
+  }
+
+  @override
+  int get hashCode =>
+      Object.hash(runtimeType, name, description, clientId, userId);
+
+  /// Create a copy of NewProject
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$NewProjectImplCopyWith<_$NewProjectImpl> get copyWith =>
+      __$$NewProjectImplCopyWithImpl<_$NewProjectImpl>(this, _$identity);
+}
+
+abstract class _NewProject implements NewProject {
+  const factory _NewProject(
+      {required final String name,
+      final String? description,
+      final String? clientId,
+      required final String userId}) = _$NewProjectImpl;
+
+  @override
+  String get name;
+  @override
+  String? get description;
+  @override
+  String? get clientId;
+  @override
+  String get userId;
+
+  /// Create a copy of NewProject
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$NewProjectImplCopyWith<_$NewProjectImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+mixin _$Project {
+  String get id => throw _privateConstructorUsedError;
+  String get name => throw _privateConstructorUsedError;
+  String? get description => throw _privateConstructorUsedError;
+  String? get clientId => throw _privateConstructorUsedError;
+  String get userId => throw _privateConstructorUsedError;
+  DateTime get createdAt => throw _privateConstructorUsedError;
+  DateTime get updatedAt => throw _privateConstructorUsedError;
+
+  /// Create a copy of Project
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $ProjectCopyWith<Project> get copyWith => throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $ProjectCopyWith<$Res> {
+  factory $ProjectCopyWith(Project value, $Res Function(Project) then) =
+      _$ProjectCopyWithImpl<$Res, Project>;
+  @useResult
+  $Res call(
+      {String id,
+      String name,
+      String? description,
+      String? clientId,
+      String userId,
+      DateTime createdAt,
+      DateTime updatedAt});
+}
+
+/// @nodoc
+class _$ProjectCopyWithImpl<$Res, $Val extends Project>
+    implements $ProjectCopyWith<$Res> {
+  _$ProjectCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of Project
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = null,
+    Object? name = null,
+    Object? description = freezed,
+    Object? clientId = freezed,
+    Object? userId = null,
+    Object? createdAt = null,
+    Object? updatedAt = null,
+  }) {
+    return _then(_value.copyWith(
+      id: null == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String,
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      description: freezed == description
+          ? _value.description
+          : description // ignore: cast_nullable_to_non_nullable
+              as String?,
+      clientId: freezed == clientId
+          ? _value.clientId
+          : clientId // ignore: cast_nullable_to_non_nullable
+              as String?,
+      userId: null == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String,
+      createdAt: null == createdAt
+          ? _value.createdAt
+          : createdAt // ignore: cast_nullable_to_non_nullable
+              as DateTime,
+      updatedAt: null == updatedAt
+          ? _value.updatedAt
+          : updatedAt // ignore: cast_nullable_to_non_nullable
+              as DateTime,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$ProjectImplCopyWith<$Res> implements $ProjectCopyWith<$Res> {
+  factory _$$ProjectImplCopyWith(
+          _$ProjectImpl value, $Res Function(_$ProjectImpl) then) =
+      __$$ProjectImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call(
+      {String id,
+      String name,
+      String? description,
+      String? clientId,
+      String userId,
+      DateTime createdAt,
+      DateTime updatedAt});
+}
+
+/// @nodoc
+class __$$ProjectImplCopyWithImpl<$Res>
+    extends _$ProjectCopyWithImpl<$Res, _$ProjectImpl>
+    implements _$$ProjectImplCopyWith<$Res> {
+  __$$ProjectImplCopyWithImpl(
+      _$ProjectImpl _value, $Res Function(_$ProjectImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of Project
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = null,
+    Object? name = null,
+    Object? description = freezed,
+    Object? clientId = freezed,
+    Object? userId = null,
+    Object? createdAt = null,
+    Object? updatedAt = null,
+  }) {
+    return _then(_$ProjectImpl(
+      id: null == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String,
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      description: freezed == description
+          ? _value.description
+          : description // ignore: cast_nullable_to_non_nullable
+              as String?,
+      clientId: freezed == clientId
+          ? _value.clientId
+          : clientId // ignore: cast_nullable_to_non_nullable
+              as String?,
+      userId: null == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String,
+      createdAt: null == createdAt
+          ? _value.createdAt
+          : createdAt // ignore: cast_nullable_to_non_nullable
+              as DateTime,
+      updatedAt: null == updatedAt
+          ? _value.updatedAt
+          : updatedAt // ignore: cast_nullable_to_non_nullable
+              as DateTime,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$ProjectImpl implements _Project {
+  const _$ProjectImpl(
+      {required this.id,
+      required this.name,
+      this.description,
+      this.clientId,
+      required this.userId,
+      required this.createdAt,
+      required this.updatedAt});
+
+  @override
+  final String id;
+  @override
+  final String name;
+  @override
+  final String? description;
+  @override
+  final String? clientId;
+  @override
+  final String userId;
+  @override
+  final DateTime createdAt;
+  @override
+  final DateTime updatedAt;
+
+  @override
+  String toString() {
+    return 'Project(id: $id, name: $name, description: $description, clientId: $clientId, userId: $userId, createdAt: $createdAt, updatedAt: $updatedAt)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$ProjectImpl &&
+            (identical(other.id, id) || other.id == id) &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.description, description) ||
+                other.description == description) &&
+            (identical(other.clientId, clientId) ||
+                other.clientId == clientId) &&
+            (identical(other.userId, userId) || other.userId == userId) &&
+            (identical(other.createdAt, createdAt) ||
+                other.createdAt == createdAt) &&
+            (identical(other.updatedAt, updatedAt) ||
+                other.updatedAt == updatedAt));
+  }
+
+  @override
+  int get hashCode => Object.hash(runtimeType, id, name, description, clientId,
+      userId, createdAt, updatedAt);
+
+  /// Create a copy of Project
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$ProjectImplCopyWith<_$ProjectImpl> get copyWith =>
+      __$$ProjectImplCopyWithImpl<_$ProjectImpl>(this, _$identity);
+}
+
+abstract class _Project implements Project {
+  const factory _Project(
+      {required final String id,
+      required final String name,
+      final String? description,
+      final String? clientId,
+      required final String userId,
+      required final DateTime createdAt,
+      required final DateTime updatedAt}) = _$ProjectImpl;
+
+  @override
+  String get id;
+  @override
+  String get name;
+  @override
+  String? get description;
+  @override
+  String? get clientId;
+  @override
+  String get userId;
+  @override
+  DateTime get createdAt;
+  @override
+  DateTime get updatedAt;
+
+  /// Create a copy of Project
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$ProjectImplCopyWith<_$ProjectImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+mixin _$ProjectUpdate {
+  String? get name => throw _privateConstructorUsedError;
+  String? get description => throw _privateConstructorUsedError;
+  String? get clientId => throw _privateConstructorUsedError;
+  String? get userId => throw _privateConstructorUsedError;
+
+  /// Create a copy of ProjectUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $ProjectUpdateCopyWith<ProjectUpdate> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $ProjectUpdateCopyWith<$Res> {
+  factory $ProjectUpdateCopyWith(
+          ProjectUpdate value, $Res Function(ProjectUpdate) then) =
+      _$ProjectUpdateCopyWithImpl<$Res, ProjectUpdate>;
+  @useResult
+  $Res call(
+      {String? name, String? description, String? clientId, String? userId});
+}
+
+/// @nodoc
+class _$ProjectUpdateCopyWithImpl<$Res, $Val extends ProjectUpdate>
+    implements $ProjectUpdateCopyWith<$Res> {
+  _$ProjectUpdateCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of ProjectUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = freezed,
+    Object? description = freezed,
+    Object? clientId = freezed,
+    Object? userId = freezed,
+  }) {
+    return _then(_value.copyWith(
+      name: freezed == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String?,
+      description: freezed == description
+          ? _value.description
+          : description // ignore: cast_nullable_to_non_nullable
+              as String?,
+      clientId: freezed == clientId
+          ? _value.clientId
+          : clientId // ignore: cast_nullable_to_non_nullable
+              as String?,
+      userId: freezed == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String?,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$ProjectUpdateImplCopyWith<$Res>
+    implements $ProjectUpdateCopyWith<$Res> {
+  factory _$$ProjectUpdateImplCopyWith(
+          _$ProjectUpdateImpl value, $Res Function(_$ProjectUpdateImpl) then) =
+      __$$ProjectUpdateImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call(
+      {String? name, String? description, String? clientId, String? userId});
+}
+
+/// @nodoc
+class __$$ProjectUpdateImplCopyWithImpl<$Res>
+    extends _$ProjectUpdateCopyWithImpl<$Res, _$ProjectUpdateImpl>
+    implements _$$ProjectUpdateImplCopyWith<$Res> {
+  __$$ProjectUpdateImplCopyWithImpl(
+      _$ProjectUpdateImpl _value, $Res Function(_$ProjectUpdateImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of ProjectUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? name = freezed,
+    Object? description = freezed,
+    Object? clientId = freezed,
+    Object? userId = freezed,
+  }) {
+    return _then(_$ProjectUpdateImpl(
+      name: freezed == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String?,
+      description: freezed == description
+          ? _value.description
+          : description // ignore: cast_nullable_to_non_nullable
+              as String?,
+      clientId: freezed == clientId
+          ? _value.clientId
+          : clientId // ignore: cast_nullable_to_non_nullable
+              as String?,
+      userId: freezed == userId
+          ? _value.userId
+          : userId // ignore: cast_nullable_to_non_nullable
+              as String?,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$ProjectUpdateImpl implements _ProjectUpdate {
+  const _$ProjectUpdateImpl(
+      {this.name, this.description, this.clientId, this.userId});
+
+  @override
+  final String? name;
+  @override
+  final String? description;
+  @override
+  final String? clientId;
+  @override
+  final String? userId;
+
+  @override
+  String toString() {
+    return 'ProjectUpdate(name: $name, description: $description, clientId: $clientId, userId: $userId)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$ProjectUpdateImpl &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.description, description) ||
+                other.description == description) &&
+            (identical(other.clientId, clientId) ||
+                other.clientId == clientId) &&
+            (identical(other.userId, userId) || other.userId == userId));
+  }
+
+  @override
+  int get hashCode =>
+      Object.hash(runtimeType, name, description, clientId, userId);
+
+  /// Create a copy of ProjectUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$ProjectUpdateImplCopyWith<_$ProjectUpdateImpl> get copyWith =>
+      __$$ProjectUpdateImplCopyWithImpl<_$ProjectUpdateImpl>(this, _$identity);
+}
+
+abstract class _ProjectUpdate implements ProjectUpdate {
+  const factory _ProjectUpdate(
+      {final String? name,
+      final String? description,
+      final String? clientId,
+      final String? userId}) = _$ProjectUpdateImpl;
+
+  @override
+  String? get name;
+  @override
+  String? get description;
+  @override
+  String? get clientId;
+  @override
+  String? get userId;
+
+  /// Create a copy of ProjectUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$ProjectUpdateImplCopyWith<_$ProjectUpdateImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
diff --git a/backend-dart/lib/domain/entities/user.dart b/backend-dart/lib/domain/entities/user.dart
index 8e268c1..2dd0537 100755
--- a/backend-dart/lib/domain/entities/user.dart
+++ b/backend-dart/lib/domain/entities/user.dart
@@ -5,11 +5,31 @@ part 'user.freezed.dart';
 @freezed
 class User with _$User {
   const factory User({
-    String? id,
-    String? name,
-    String? email,
-    String? password,
+    required String id,
+    required String name,
+    required String email,
+    String? passwordHash,
     DateTime? createdAt,
     DateTime? updatedAt,
   }) = _User;
 }
+
+@freezed
+class UserCreate with _$UserCreate {
+  const factory UserCreate({
+    String? id,
+    required String name,
+    required String email,
+    required String password,
+  }) = _UserCreate;
+}
+
+@freezed
+class UserUpdate with _$UserUpdate {
+  const factory UserUpdate({
+    required String id,
+    String? name,
+    String? email,
+    String? password,
+  }) = _UserUpdate;
+}
diff --git a/backend-dart/lib/domain/entities/user.freezed.dart b/backend-dart/lib/domain/entities/user.freezed.dart
index e262253..80e141f 100644
--- a/backend-dart/lib/domain/entities/user.freezed.dart
+++ b/backend-dart/lib/domain/entities/user.freezed.dart
@@ -16,10 +16,10 @@ final _privateConstructorUsedError = UnsupportedError(
 
 /// @nodoc
 mixin _$User {
-  String? get id => throw _privateConstructorUsedError;
-  String? get name => throw _privateConstructorUsedError;
-  String? get email => throw _privateConstructorUsedError;
-  String? get password => throw _privateConstructorUsedError;
+  String get id => throw _privateConstructorUsedError;
+  String get name => throw _privateConstructorUsedError;
+  String get email => throw _privateConstructorUsedError;
+  String? get passwordHash => throw _privateConstructorUsedError;
   DateTime? get createdAt => throw _privateConstructorUsedError;
   DateTime? get updatedAt => throw _privateConstructorUsedError;
 
@@ -35,10 +35,10 @@ abstract class $UserCopyWith<$Res> {
       _$UserCopyWithImpl<$Res, User>;
   @useResult
   $Res call(
-      {String? id,
-      String? name,
-      String? email,
-      String? password,
+      {String id,
+      String name,
+      String email,
+      String? passwordHash,
       DateTime? createdAt,
       DateTime? updatedAt});
 }
@@ -58,29 +58,29 @@ class _$UserCopyWithImpl<$Res, $Val extends User>
   @pragma('vm:prefer-inline')
   @override
   $Res call({
-    Object? id = freezed,
-    Object? name = freezed,
-    Object? email = freezed,
-    Object? password = freezed,
+    Object? id = null,
+    Object? name = null,
+    Object? email = null,
+    Object? passwordHash = freezed,
     Object? createdAt = freezed,
     Object? updatedAt = freezed,
   }) {
     return _then(_value.copyWith(
-      id: freezed == id
+      id: null == id
           ? _value.id
           : id // ignore: cast_nullable_to_non_nullable
-              as String?,
-      name: freezed == name
+              as String,
+      name: null == name
           ? _value.name
           : name // ignore: cast_nullable_to_non_nullable
-              as String?,
-      email: freezed == email
+              as String,
+      email: null == email
           ? _value.email
           : email // ignore: cast_nullable_to_non_nullable
-              as String?,
-      password: freezed == password
-          ? _value.password
-          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+      passwordHash: freezed == passwordHash
+          ? _value.passwordHash
+          : passwordHash // ignore: cast_nullable_to_non_nullable
               as String?,
       createdAt: freezed == createdAt
           ? _value.createdAt
@@ -102,10 +102,10 @@ abstract class _$$UserImplCopyWith<$Res> implements $UserCopyWith<$Res> {
   @override
   @useResult
   $Res call(
-      {String? id,
-      String? name,
-      String? email,
-      String? password,
+      {String id,
+      String name,
+      String email,
+      String? passwordHash,
       DateTime? createdAt,
       DateTime? updatedAt});
 }
@@ -122,29 +122,29 @@ class __$$UserImplCopyWithImpl<$Res>
   @pragma('vm:prefer-inline')
   @override
   $Res call({
-    Object? id = freezed,
-    Object? name = freezed,
-    Object? email = freezed,
-    Object? password = freezed,
+    Object? id = null,
+    Object? name = null,
+    Object? email = null,
+    Object? passwordHash = freezed,
     Object? createdAt = freezed,
     Object? updatedAt = freezed,
   }) {
     return _then(_$UserImpl(
-      id: freezed == id
+      id: null == id
           ? _value.id
           : id // ignore: cast_nullable_to_non_nullable
-              as String?,
-      name: freezed == name
+              as String,
+      name: null == name
           ? _value.name
           : name // ignore: cast_nullable_to_non_nullable
-              as String?,
-      email: freezed == email
+              as String,
+      email: null == email
           ? _value.email
           : email // ignore: cast_nullable_to_non_nullable
-              as String?,
-      password: freezed == password
-          ? _value.password
-          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+      passwordHash: freezed == passwordHash
+          ? _value.passwordHash
+          : passwordHash // ignore: cast_nullable_to_non_nullable
               as String?,
       createdAt: freezed == createdAt
           ? _value.createdAt
@@ -162,21 +162,21 @@ class __$$UserImplCopyWithImpl<$Res>
 
 class _$UserImpl implements _User {
   const _$UserImpl(
-      {this.id,
-      this.name,
-      this.email,
-      this.password,
+      {required this.id,
+      required this.name,
+      required this.email,
+      this.passwordHash,
       this.createdAt,
       this.updatedAt});
 
   @override
-  final String? id;
+  final String id;
   @override
-  final String? name;
+  final String name;
   @override
-  final String? email;
+  final String email;
   @override
-  final String? password;
+  final String? passwordHash;
   @override
   final DateTime? createdAt;
   @override
@@ -184,7 +184,7 @@ class _$UserImpl implements _User {
 
   @override
   String toString() {
-    return 'User(id: $id, name: $name, email: $email, password: $password, createdAt: $createdAt, updatedAt: $updatedAt)';
+    return 'User(id: $id, name: $name, email: $email, passwordHash: $passwordHash, createdAt: $createdAt, updatedAt: $updatedAt)';
   }
 
   @override
@@ -195,8 +195,8 @@ class _$UserImpl implements _User {
             (identical(other.id, id) || other.id == id) &&
             (identical(other.name, name) || other.name == name) &&
             (identical(other.email, email) || other.email == email) &&
-            (identical(other.password, password) ||
-                other.password == password) &&
+            (identical(other.passwordHash, passwordHash) ||
+                other.passwordHash == passwordHash) &&
             (identical(other.createdAt, createdAt) ||
                 other.createdAt == createdAt) &&
             (identical(other.updatedAt, updatedAt) ||
@@ -204,8 +204,8 @@ class _$UserImpl implements _User {
   }
 
   @override
-  int get hashCode =>
-      Object.hash(runtimeType, id, name, email, password, createdAt, updatedAt);
+  int get hashCode => Object.hash(
+      runtimeType, id, name, email, passwordHash, createdAt, updatedAt);
 
   /// Create a copy of User
   /// with the given fields replaced by the non-null parameter values.
@@ -218,21 +218,21 @@ class _$UserImpl implements _User {
 
 abstract class _User implements User {
   const factory _User(
-      {final String? id,
-      final String? name,
-      final String? email,
-      final String? password,
+      {required final String id,
+      required final String name,
+      required final String email,
+      final String? passwordHash,
       final DateTime? createdAt,
       final DateTime? updatedAt}) = _$UserImpl;
 
   @override
-  String? get id;
+  String get id;
   @override
-  String? get name;
+  String get name;
   @override
-  String? get email;
+  String get email;
   @override
-  String? get password;
+  String? get passwordHash;
   @override
   DateTime? get createdAt;
   @override
@@ -245,3 +245,370 @@ abstract class _User implements User {
   _$$UserImplCopyWith<_$UserImpl> get copyWith =>
       throw _privateConstructorUsedError;
 }
+
+/// @nodoc
+mixin _$UserCreate {
+  String? get id => throw _privateConstructorUsedError;
+  String get name => throw _privateConstructorUsedError;
+  String get email => throw _privateConstructorUsedError;
+  String get password => throw _privateConstructorUsedError;
+
+  /// Create a copy of UserCreate
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $UserCreateCopyWith<UserCreate> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $UserCreateCopyWith<$Res> {
+  factory $UserCreateCopyWith(
+          UserCreate value, $Res Function(UserCreate) then) =
+      _$UserCreateCopyWithImpl<$Res, UserCreate>;
+  @useResult
+  $Res call({String? id, String name, String email, String password});
+}
+
+/// @nodoc
+class _$UserCreateCopyWithImpl<$Res, $Val extends UserCreate>
+    implements $UserCreateCopyWith<$Res> {
+  _$UserCreateCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of UserCreate
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = freezed,
+    Object? name = null,
+    Object? email = null,
+    Object? password = null,
+  }) {
+    return _then(_value.copyWith(
+      id: freezed == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String?,
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      email: null == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String,
+      password: null == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$UserCreateImplCopyWith<$Res>
+    implements $UserCreateCopyWith<$Res> {
+  factory _$$UserCreateImplCopyWith(
+          _$UserCreateImpl value, $Res Function(_$UserCreateImpl) then) =
+      __$$UserCreateImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String? id, String name, String email, String password});
+}
+
+/// @nodoc
+class __$$UserCreateImplCopyWithImpl<$Res>
+    extends _$UserCreateCopyWithImpl<$Res, _$UserCreateImpl>
+    implements _$$UserCreateImplCopyWith<$Res> {
+  __$$UserCreateImplCopyWithImpl(
+      _$UserCreateImpl _value, $Res Function(_$UserCreateImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of UserCreate
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = freezed,
+    Object? name = null,
+    Object? email = null,
+    Object? password = null,
+  }) {
+    return _then(_$UserCreateImpl(
+      id: freezed == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String?,
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      email: null == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String,
+      password: null == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$UserCreateImpl implements _UserCreate {
+  const _$UserCreateImpl(
+      {this.id,
+      required this.name,
+      required this.email,
+      required this.password});
+
+  @override
+  final String? id;
+  @override
+  final String name;
+  @override
+  final String email;
+  @override
+  final String password;
+
+  @override
+  String toString() {
+    return 'UserCreate(id: $id, name: $name, email: $email, password: $password)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$UserCreateImpl &&
+            (identical(other.id, id) || other.id == id) &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.email, email) || other.email == email) &&
+            (identical(other.password, password) ||
+                other.password == password));
+  }
+
+  @override
+  int get hashCode => Object.hash(runtimeType, id, name, email, password);
+
+  /// Create a copy of UserCreate
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$UserCreateImplCopyWith<_$UserCreateImpl> get copyWith =>
+      __$$UserCreateImplCopyWithImpl<_$UserCreateImpl>(this, _$identity);
+}
+
+abstract class _UserCreate implements UserCreate {
+  const factory _UserCreate(
+      {final String? id,
+      required final String name,
+      required final String email,
+      required final String password}) = _$UserCreateImpl;
+
+  @override
+  String? get id;
+  @override
+  String get name;
+  @override
+  String get email;
+  @override
+  String get password;
+
+  /// Create a copy of UserCreate
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$UserCreateImplCopyWith<_$UserCreateImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+mixin _$UserUpdate {
+  String get id => throw _privateConstructorUsedError;
+  String? get name => throw _privateConstructorUsedError;
+  String? get email => throw _privateConstructorUsedError;
+  String? get password => throw _privateConstructorUsedError;
+
+  /// Create a copy of UserUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $UserUpdateCopyWith<UserUpdate> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $UserUpdateCopyWith<$Res> {
+  factory $UserUpdateCopyWith(
+          UserUpdate value, $Res Function(UserUpdate) then) =
+      _$UserUpdateCopyWithImpl<$Res, UserUpdate>;
+  @useResult
+  $Res call({String id, String? name, String? email, String? password});
+}
+
+/// @nodoc
+class _$UserUpdateCopyWithImpl<$Res, $Val extends UserUpdate>
+    implements $UserUpdateCopyWith<$Res> {
+  _$UserUpdateCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of UserUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = null,
+    Object? name = freezed,
+    Object? email = freezed,
+    Object? password = freezed,
+  }) {
+    return _then(_value.copyWith(
+      id: null == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String,
+      name: freezed == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String?,
+      email: freezed == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String?,
+      password: freezed == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String?,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$UserUpdateImplCopyWith<$Res>
+    implements $UserUpdateCopyWith<$Res> {
+  factory _$$UserUpdateImplCopyWith(
+          _$UserUpdateImpl value, $Res Function(_$UserUpdateImpl) then) =
+      __$$UserUpdateImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({String id, String? name, String? email, String? password});
+}
+
+/// @nodoc
+class __$$UserUpdateImplCopyWithImpl<$Res>
+    extends _$UserUpdateCopyWithImpl<$Res, _$UserUpdateImpl>
+    implements _$$UserUpdateImplCopyWith<$Res> {
+  __$$UserUpdateImplCopyWithImpl(
+      _$UserUpdateImpl _value, $Res Function(_$UserUpdateImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of UserUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = null,
+    Object? name = freezed,
+    Object? email = freezed,
+    Object? password = freezed,
+  }) {
+    return _then(_$UserUpdateImpl(
+      id: null == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String,
+      name: freezed == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String?,
+      email: freezed == email
+          ? _value.email
+          : email // ignore: cast_nullable_to_non_nullable
+              as String?,
+      password: freezed == password
+          ? _value.password
+          : password // ignore: cast_nullable_to_non_nullable
+              as String?,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$UserUpdateImpl implements _UserUpdate {
+  const _$UserUpdateImpl(
+      {required this.id, this.name, this.email, this.password});
+
+  @override
+  final String id;
+  @override
+  final String? name;
+  @override
+  final String? email;
+  @override
+  final String? password;
+
+  @override
+  String toString() {
+    return 'UserUpdate(id: $id, name: $name, email: $email, password: $password)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$UserUpdateImpl &&
+            (identical(other.id, id) || other.id == id) &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.email, email) || other.email == email) &&
+            (identical(other.password, password) ||
+                other.password == password));
+  }
+
+  @override
+  int get hashCode => Object.hash(runtimeType, id, name, email, password);
+
+  /// Create a copy of UserUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$UserUpdateImplCopyWith<_$UserUpdateImpl> get copyWith =>
+      __$$UserUpdateImplCopyWithImpl<_$UserUpdateImpl>(this, _$identity);
+}
+
+abstract class _UserUpdate implements UserUpdate {
+  const factory _UserUpdate(
+      {required final String id,
+      final String? name,
+      final String? email,
+      final String? password}) = _$UserUpdateImpl;
+
+  @override
+  String get id;
+  @override
+  String? get name;
+  @override
+  String? get email;
+  @override
+  String? get password;
+
+  /// Create a copy of UserUpdate
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$UserUpdateImplCopyWith<_$UserUpdateImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
diff --git a/backend-dart/lib/domain/repository/user_repository.dart b/backend-dart/lib/domain/repository/user_repository.dart
index 1c599b1..af94616 100755
--- a/backend-dart/lib/domain/repository/user_repository.dart
+++ b/backend-dart/lib/domain/repository/user_repository.dart
@@ -3,13 +3,13 @@ import 'package:backend_dart/domain/interface/error.dart';
 import 'package:fpdart/fpdart.dart';
 
 abstract class UserRepository {
-  TaskEither<IError, User> create(User user);
+  TaskEither<IError, User> create(UserCreate user);
 
   TaskEither<IError, User> findByEmail(String email);
 
   TaskEither<IError, User> findById(String id);
 
-  TaskEither<IError, User> update(User user);
+  TaskEither<IError, User> update(UserUpdate user);
 
   TaskEither<IError, void> delete(String id);
 
diff --git a/backend-dart/lib/infrastructure/persistence/mapper/user_dbo_mapper.dart b/backend-dart/lib/infrastructure/persistence/mapper/user_dbo_mapper.dart
index c37f70f..bbc87a2 100644
--- a/backend-dart/lib/infrastructure/persistence/mapper/user_dbo_mapper.dart
+++ b/backend-dart/lib/infrastructure/persistence/mapper/user_dbo_mapper.dart
@@ -1,37 +1,40 @@
+import 'package:backend_dart/common/extensions.dart';
+import 'package:backend_dart/common/secure_hash.dart';
 import 'package:backend_dart/domain/entities/user.dart';
 import 'package:backend_dart/domain/interface/error.dart';
-import 'package:backend_dart/domain/interface/mapper.dart';
 import 'package:backend_dart/infrastructure/persistence/db/model.dart';
+import 'package:backend_dart/infrastructure/persistence/db/prisma.dart';
 import 'package:fpdart/fpdart.dart';
+import 'package:orm/orm.dart';
 
-class UserDboMapper implements IMapper<User, UserDbo> {
-  @override
+class UserDboMapper {
   TaskEither<IError, User> from(UserDbo target) => TaskEither.of(User(
         id: target.id!,
         name: target.name!,
         email: target.email!,
-        password: target.password,
+        passwordHash: target.password,
         createdAt: target.createdAt,
         updatedAt: target.updatedAt,
       ));
 
-  @override
   TaskEither<IError, List<User>> listFrom(Iterable<UserDbo> targets) {
     return TaskEither.traverseList(targets.toList(), from);
   }
 
-  @override
-  TaskEither<IError, List<UserDbo>> listTo(Iterable<User> origins) {
-    return TaskEither.traverseList(origins.toList(), to);
-  }
+  TaskEither<IError, UserDboUncheckedUpdateInput> fromUpdateTo(
+          UserUpdate origin) =>
+      TaskEither.of(UserDboUncheckedUpdateInput(
+        id: PrismaUnion.$1(origin.id),
+        name: origin.name.let(PrismaUnion.$1),
+        email: origin.email.let(PrismaUnion.$1),
+        password: origin.password.let(generateSecureHash).let(PrismaUnion.$1),
+      ));
 
-  @override
-  TaskEither<IError, UserDbo> to(User origin) => TaskEither.of(UserDbo(
+  TaskEither<IError, UserDboCreateInput> fromCreateTo(UserCreate origin) =>
+      TaskEither.of(UserDboCreateInput(
         id: origin.id,
         name: origin.name,
         email: origin.email,
-        password: origin.password,
-        createdAt: origin.createdAt,
-        updatedAt: origin.updatedAt,
+        password: generateSecureHash(origin.password),
       ));
 }
diff --git a/backend-dart/lib/infrastructure/persistence/prisma_database.dart b/backend-dart/lib/infrastructure/persistence/prisma_database.dart
index 8276b9d..5626f86 100644
--- a/backend-dart/lib/infrastructure/persistence/prisma_database.dart
+++ b/backend-dart/lib/infrastructure/persistence/prisma_database.dart
@@ -1,4 +1,4 @@
-import 'package:backend_dart/domain/interface/database.dart';
+import 'package:backend_dart/domain/data/database.dart';
 import 'package:backend_dart/infrastructure/persistence/db/client.dart';
 import 'package:backend_dart/infrastructure/persistence/prisma_user_data_source.dart';
 
diff --git a/backend-dart/lib/infrastructure/persistence/prisma_user_data_source.dart b/backend-dart/lib/infrastructure/persistence/prisma_user_data_source.dart
index 82fe335..7b3604c 100755
--- a/backend-dart/lib/infrastructure/persistence/prisma_user_data_source.dart
+++ b/backend-dart/lib/infrastructure/persistence/prisma_user_data_source.dart
@@ -12,36 +12,25 @@ import 'package:uuid/uuid.dart';
 
 import 'db/client.dart';
 
-class PrismaUserDataSource implements UserDataSource<User> {
+class PrismaUserDataSource implements UserDataSource {
   final PrismaClient prisma;
   final UserDboMapper mapper = UserDboMapper();
   PrismaUserDataSource(this.prisma);
 
   @override
-  TaskEither<IError, User> create(User user) {
-    return TaskEither<IError, UserDbo>.tryCatch(
-      () async {
-        if (user.password == null) {
-          throw Exception('Password is required');
-        }
-        if (user.email == null) {
-          throw Exception('Email is required');
-        }
-        final createdUser = await prisma.userDbo.create(
-          data: PrismaUnion.$1(UserDboCreateInput(
-            id: user.id,
-            name: user.name!,
-            email: user.email!,
-            password: user.password!,
-          )),
-        );
-        return createdUser;
-      },
-      (error, _) => AppError.databaseError(
-        message: 'Failed to create user: ${error.toString()}',
-      ),
-    ).flatMap(mapper.from);
-  }
+  TaskEither<IError, User> create(UserCreate user) => mapper
+      .fromCreateTo(user)
+      .flatMap((userDbo) => TaskEither<IError, UserDbo>.tryCatch(
+            () async {
+              final createdUser = await prisma.userDbo.create(
+                data: PrismaUnion.$1(userDbo),
+              );
+              return createdUser;
+            },
+            (error, _) => AppError.databaseError(
+              message: 'Failed to create user: ${error.toString()}',
+            ),
+          ).flatMap(mapper.from));
 
   @override
   TaskEither<IError, User> findByEmail(String email) {
@@ -81,41 +70,36 @@ class PrismaUserDataSource implements UserDataSource<User> {
   }
 
   @override
-  TaskEither<IError, User> update(User user) {
+  TaskEither<IError, User> update(UserUpdate user) {
     return mapper
-        .to(user)
-        .flatMap((userDbo) => TaskEither.tryCatch(() async {
+        .fromUpdateTo(user)
+        .flatMap(
+          (userDbo) => TaskEither.tryCatch(
+            () async {
               // Führe das Update durch
               if (userDbo.id == null) {
                 throw Exception('User ID is required');
               }
 
               final updatedUser = await prisma.userDbo.update(
-                data: PrismaUnion.$2(
-                  UserDboUncheckedUpdateInput(
-                    id: PrismaUnion.$1(userDbo.id!),
-                    name: userDbo.name != null
-                        ? PrismaUnion.$1(userDbo.name!)
-                        : null,
-                    email: userDbo.email != null
-                        ? PrismaUnion.$1(userDbo.email!)
-                        : null,
-                    password: userDbo.password != null
-                        ? PrismaUnion.$1(userDbo.password!)
-                        : null,
-                  ),
-                ),
-                where: UserDboWhereUniqueInput(id: userDbo.id),
+                data: PrismaUnion.$2(userDbo),
+                where: UserDboWhereUniqueInput(id: user.id),
               );
 
               return updatedUser;
             },
-                (error, _) => AppError.databaseError(
-                      message: 'Failed to update user: ${error.toString()}',
-                    )))
-        .flatMap(errorOnNull(AppError.notFound(
-          'User not found',
-        )))
+            (error, _) => AppError.databaseError(
+              message: 'Failed to update user: ${error.toString()}',
+            ),
+          ),
+        )
+        .flatMap(
+          errorOnNull(
+            AppError.notFound(
+              'User not found',
+            ),
+          ),
+        )
         .flatMap(mapper.from);
   }
 
diff --git a/backend-dart/pubspec.lock b/backend-dart/pubspec.lock
index 8f67ebb..c6915f8 100755
--- a/backend-dart/pubspec.lock
+++ b/backend-dart/pubspec.lock
@@ -199,7 +199,7 @@ packages:
     source: hosted
     version: "1.11.0"
   crypto:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: crypto
       sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
diff --git a/backend-dart/pubspec.yaml b/backend-dart/pubspec.yaml
index 53cc8f8..e99c0e1 100755
--- a/backend-dart/pubspec.yaml
+++ b/backend-dart/pubspec.yaml
@@ -21,6 +21,7 @@ dependencies:
   json_annotation: ^4.9.0
   freezed_annotation: ^2.4.4
   uuid: ^4.5.1
+  crypto: ^3.0.6
   
 dev_dependencies:
   lints: ^3.0.0