diff --git a/backend/src/graphql/inputs/LoginUserInput.ts b/backend/src/graphql/inputs/LoginUserInput.ts
index 68ddad628..66f35980f 100644
--- a/backend/src/graphql/inputs/LoginUserInput.ts
+++ b/backend/src/graphql/inputs/LoginUserInput.ts
@@ -82,23 +82,23 @@ export class UpdateUserInfosArgs {
   @Field(() => String)
   email!: string
 
-  @Field(() => String)
-  firstName?: string
+  @Field({ nullable: true })
+  firstName?: string | null
 
-  @Field(() => String)
-  lastName?: string
+  @Field({ nullable: true })
+  lastName?: string | null
 
-  @Field(() => String)
-  username?: string
+  @Field({ nullable: true })
+  username?: string | null
 
-  @Field(() => String)
-  language?: string
+  @Field({ nullable: true })
+  language?: string | null
 
-  @Field(() => String)
-  password?: string
+  @Field({ nullable: true })
+  password?: string | null
 
-  @Field(() => String)
-  passwordNew?: string
+  @Field({ nullable: true })
+  passwordNew?: string | null
 }
 
 @ArgsType()
diff --git a/backend/src/graphql/models/BaseResponse.ts b/backend/src/graphql/models/BaseResponse.ts
deleted file mode 100644
index 712660bd3..000000000
--- a/backend/src/graphql/models/BaseResponse.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { Entity, BaseEntity } from 'typeorm'
-import { ObjectType, Field } from 'type-graphql'
-
-@Entity()
-@ObjectType()
-export class BaseResponse extends BaseEntity {
-  @Field(() => Boolean)
-  success: boolean
-}
diff --git a/backend/src/graphql/models/ChangePasswordResponse.ts b/backend/src/graphql/models/ChangePasswordResponse.ts
deleted file mode 100644
index 1ba3247cd..000000000
--- a/backend/src/graphql/models/ChangePasswordResponse.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { Entity, BaseEntity } from 'typeorm'
-import { ObjectType, Field } from 'type-graphql'
-
-@Entity()
-@ObjectType()
-export class ChangePasswordResponse extends BaseEntity {
-  @Field(() => String)
-  state: string
-}
diff --git a/backend/src/graphql/models/CheckUsernameResponse.ts b/backend/src/graphql/models/CheckUsernameResponse.ts
index ac51b64e1..de5724c8d 100644
--- a/backend/src/graphql/models/CheckUsernameResponse.ts
+++ b/backend/src/graphql/models/CheckUsernameResponse.ts
@@ -1,9 +1,18 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { Entity, BaseEntity } from 'typeorm'
 import { ObjectType, Field } from 'type-graphql'
 
 @Entity()
 @ObjectType()
 export class CheckUsernameResponse extends BaseEntity {
+  constructor(json: any) {
+    super()
+    this.state = json.state
+    this.msg = json.msg
+    this.groupId = json.group_id
+  }
+
   @Field(() => String)
   state: string
 
diff --git a/backend/src/graphql/models/CreateResponse.ts b/backend/src/graphql/models/CreateResponse.ts
index 54276b031..144d6456c 100644
--- a/backend/src/graphql/models/CreateResponse.ts
+++ b/backend/src/graphql/models/CreateResponse.ts
@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { Entity, BaseEntity } from 'typeorm'
 import { ObjectType, Field } from 'type-graphql'
 
diff --git a/backend/src/graphql/models/ResetPasswordResponse.ts b/backend/src/graphql/models/ResetPasswordResponse.ts
new file mode 100644
index 000000000..aae209059
--- /dev/null
+++ b/backend/src/graphql/models/ResetPasswordResponse.ts
@@ -0,0 +1,16 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+import { Entity, BaseEntity } from 'typeorm'
+import { ObjectType, Field } from 'type-graphql'
+
+@Entity()
+@ObjectType()
+export class ResetPasswordResponse extends BaseEntity {
+  constructor(json: any) {
+    super()
+    this.state = json.state
+  }
+
+  @Field(() => String)
+  state: string
+}
diff --git a/backend/src/graphql/models/SendEmailResponse.ts b/backend/src/graphql/models/SendPasswordResetEmailResponse.ts
similarity index 60%
rename from backend/src/graphql/models/SendEmailResponse.ts
rename to backend/src/graphql/models/SendPasswordResetEmailResponse.ts
index d8e163478..f426d5245 100644
--- a/backend/src/graphql/models/SendEmailResponse.ts
+++ b/backend/src/graphql/models/SendPasswordResetEmailResponse.ts
@@ -1,9 +1,11 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { Entity, BaseEntity } from 'typeorm'
 import { ObjectType, Field } from 'type-graphql'
 
 @Entity()
 @ObjectType()
-export class SendEmailResponse extends BaseEntity {
+export class SendPasswordResetEmailResponse extends BaseEntity {
   constructor(json: any) {
     super()
     this.state = json.state
diff --git a/backend/src/graphql/models/Server.ts b/backend/src/graphql/models/Server.ts
index e722a2c97..1b6f01627 100644
--- a/backend/src/graphql/models/Server.ts
+++ b/backend/src/graphql/models/Server.ts
@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { Entity, BaseEntity } from 'typeorm'
 import { ObjectType, Field } from 'type-graphql'
 
diff --git a/backend/src/graphql/models/UpdateUserInfosResponse.ts b/backend/src/graphql/models/UpdateUserInfosResponse.ts
index 14f834932..765da5208 100644
--- a/backend/src/graphql/models/UpdateUserInfosResponse.ts
+++ b/backend/src/graphql/models/UpdateUserInfosResponse.ts
@@ -1,15 +1,16 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { Entity, BaseEntity } from 'typeorm'
 import { ObjectType, Field } from 'type-graphql'
 
 @Entity()
 @ObjectType()
 export class UpdateUserInfosResponse extends BaseEntity {
-  @Field(() => String)
-  state: string
+  constructor(json: any) {
+    super()
+    this.validValues = json.valid_values
+  }
 
   @Field(() => Number)
   validValues: number
-
-  @Field(() => [String])
-  errors: [string]
 }
diff --git a/backend/src/graphql/models/UserInfoData.ts b/backend/src/graphql/models/UserInfoData.ts
index 46b336d5e..2e65aca82 100644
--- a/backend/src/graphql/models/UserInfoData.ts
+++ b/backend/src/graphql/models/UserInfoData.ts
@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { Entity, BaseEntity } from 'typeorm'
 import { ObjectType, Field } from 'type-graphql'
 import { Server } from './Server'
diff --git a/backend/src/graphql/resolvers/UserResolver.ts b/backend/src/graphql/resolvers/UserResolver.ts
index d22dd49ac..43d83938c 100644
--- a/backend/src/graphql/resolvers/UserResolver.ts
+++ b/backend/src/graphql/resolvers/UserResolver.ts
@@ -1,13 +1,13 @@
 // import jwt from 'jsonwebtoken'
-import { Resolver, Query, /* Mutation, */ Args, Arg } from 'type-graphql'
+import { Resolver, Query, Args, Arg } from 'type-graphql'
 import CONFIG from '../../config'
-import { ChangePasswordResponse } from '../models/ChangePasswordResponse'
+import { ResetPasswordResponse } from '../models/ResetPasswordResponse'
 import { CheckUsernameResponse } from '../models/CheckUsernameResponse'
 import { CreateResponse } from '../models/CreateResponse'
 import { GetUserInfoResponse } from '../models/UserInfoData'
 import { LoginResponse } from '../models/LoginResponse'
 import { LoginViaVerificationCode } from '../models/LoginViaVerificationCode'
-import { SendEmailResponse } from '../models/SendEmailResponse'
+import { SendPasswordResetEmailResponse } from '../models/SendPasswordResetEmailResponse'
 import { UpdateUserInfosResponse } from '../models/UpdateUserInfosResponse'
 import {
   ChangePasswordArgs,
@@ -66,17 +66,16 @@ export class UserResolver {
     return new LoginViaVerificationCode(result.data)
   }
 
-  /* @Query(() => LogoutResponse)
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  async logout(@Arg('sessionId') sessionId: number): Promise<LogoutResponse> {
+  @Query(() => String)
+  async logout(@Arg('sessionId') sessionId: number): Promise<string> {
     const payload = { session_id: sessionId }
-    const result = apiPost(CONFIG.LOGIN_API_URL + 'logout', payload)
+    const result = await apiPost(CONFIG.LOGIN_API_URL + 'logout', payload)
     if (!result.success) {
       throw new Error(result.data)
     }
-    return result.data
+    return 'success'
   }
-*/
+
   @Query(() => CreateResponse)
   async create(
     @Args() { email, firstName, lastName, password }: CreateUserArgs,
@@ -96,17 +95,20 @@ export class UserResolver {
     return new CreateResponse(result.data)
   }
 
-  @Query(() => SendEmailResponse)
-  async sendEmail(
+  // TODO
+  @Query(() => SendPasswordResetEmailResponse)
+  async sendResetPasswordEmail(
     @Args()
     { email, emailText = 7, emailVerificationCodeType = 'resetPassword' }: SendEmailArgs,
-  ): Promise<any> {
+  ): Promise<SendPasswordResetEmailResponse> {
     const payload = {
       email,
       email_text: emailText,
       email_verification_code_type: emailVerificationCodeType,
     }
-    return apiPost(CONFIG.LOGIN_API_URL + 'sendEmail', payload)
+    const response = await apiPost(CONFIG.LOGIN_API_URL + 'sendEmail', payload)
+    if (!response.success) throw new Error(response.data)
+    return new SendPasswordResetEmailResponse(response.data)
   }
 
   @Query(() => GetUserInfoResponse)
@@ -119,16 +121,19 @@ export class UserResolver {
     return apiPost(CONFIG.LOGIN_API_URL + 'getUserInfos', payload)
   }
 
-  @Query(() => ChangePasswordResponse)
-  async changePassword(@Args() { sessionId, email, password }: ChangePasswordArgs): Promise<any> {
+  @Query(() => ResetPasswordResponse)
+  async resetPassword(
+    @Args()
+    { sessionId, email, password }: ChangePasswordArgs,
+  ): Promise<ResetPasswordResponse> {
     const payload = {
       session_id: sessionId,
       email,
       password,
     }
     const result = await apiPost(CONFIG.LOGIN_API_URL + 'resetPassword', payload)
-    if (result.success) return result.result.data.state
-    return result.result
+    if (!result.success) throw new Error(result.data)
+    return new ResetPasswordResponse(result.data)
   }
 
   @Query(() => UpdateUserInfosResponse)
@@ -137,32 +142,39 @@ export class UserResolver {
     {
       sessionId,
       email,
-      firstName,
-      lastName,
-      username,
-      language,
-      password,
-      passwordNew,
+      firstName = null,
+      lastName = null,
+      username = null,
+      language = null,
+      password = null,
+      passwordNew = null,
     }: UpdateUserInfosArgs,
-  ): Promise<any> {
+  ): Promise<UpdateUserInfosResponse> {
     const payload = {
       session_id: sessionId,
       email,
       update: {
-        'User.first_name': firstName,
-        'User.last_name': lastName,
-        // 'User.description': data.description,
-        'User.username': username,
-        'User.language': language,
-        'User.password_old': password,
-        'User.password': passwordNew,
+        'User.first_name': firstName !== null ? firstName : undefined,
+        'User.last_name': lastName !== null ? lastName : undefined,
+        'User.username': username !== null ? username : undefined,
+        'User.language': language !== null ? language : undefined,
+        'User.password': passwordNew !== null ? passwordNew : undefined,
+        'User.password_old': password !== null ? password : undefined,
       },
     }
-    return apiPost(CONFIG.LOGIN_API_URL + 'updateUserInfos', payload)
+    const result = await apiPost(CONFIG.LOGIN_API_URL + 'updateUserInfos', payload)
+    if (!result.success) throw new Error(result.data)
+    return new UpdateUserInfosResponse(result.data)
   }
 
   @Query(() => CheckUsernameResponse)
-  async checkUsername(@Args() { username, groupId = 1 }: CheckUsernameArgs): Promise<any> {
-    return apiGet(CONFIG.LOGIN_API_URL + `checkUsername?username=${username}&group_id=${groupId}`)
+  async checkUsername(
+    @Args() { username, groupId = 1 }: CheckUsernameArgs,
+  ): Promise<CheckUsernameResponse> {
+    const response = await apiGet(
+      CONFIG.LOGIN_API_URL + `checkUsername?username=${username}&group_id=${groupId}`,
+    )
+    if (!response.success) throw new Error(response.data)
+    return new CheckUsernameResponse(response.data)
   }
 }
diff --git a/backend/src/graphql/resolvers/helpers/MapVariableToColumnName.ts b/backend/src/graphql/resolvers/helpers/MapVariableToColumnName.ts
deleted file mode 100644
index e69de29bb..000000000