Removed unused usings

UserService.DatabaseLayer/Repositories/UsersRepository.cs

@@ -5,7 +5,6 @@ using System.Linq.Expressions;
 using System.Threading;
 using System.Threading.Tasks;
 using LinqToDB;
-using LinqToDB.Data;
 using UserService.DatabaseLayer.DataModels;
 using UserService.Infrastructure.DataModels;
 

UserService.Infrastructure/DataModels/Node.cs

@@ -1,6 +1,5 @@
 #nullable enable
 using System;
-using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 
 namespace UserService.Infrastructure.DataModels

UserService.Infrastructure/DataModels/OrganizationUnit.cs

@@ -1,6 +1,4 @@
-using System.Collections.Generic;
-
-namespace UserService.Infrastructure.DataModels
+namespace UserService.Infrastructure.DataModels
 {
     public class OrganizationUnit : Node
     {

UserService.Infrastructure/DataModels/User.cs

@@ -1,6 +1,4 @@
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
+using System.ComponentModel.DataAnnotations;
 
 namespace UserService.Infrastructure.DataModels
 {