индекс у пользователя не уникален

DepartmentPortal/Common/DatabaseCore/DatabaseContext.cs

@@ -30,8 +30,6 @@ namespace DatabaseCore
 
 			modelBuilder.Entity<Role>().HasIndex(s => s.RoleName).IsUnique();
 
-			modelBuilder.Entity<User>().HasIndex(s => s.UserName).IsUnique();
-
 			modelBuilder.Entity<EmployeePost>().HasIndex(s => s.EmployeePostName).IsUnique();
 
 			modelBuilder.Entity<Employee>().HasIndex(p => new { p.FirstName, p.LastName, p.Patronymic }).IsUnique();

DepartmentPortal/Common/DatabaseCore/Migrations/20210403054350_AddEmployee.cs

@@ -102,7 +102,6 @@ namespace DatabaseCore.Migrations
                 name: "IX_Users_UserName",
                 table: "Users",
                 column: "UserName",
-                unique: true,
                 filter: "[UserName] IS NOT NULL");
 
             migrationBuilder.CreateIndex(

DepartmentPortal/Common/DatabaseCore/Migrations/DatabaseContextModelSnapshot.cs

@@ -266,7 +266,6 @@ namespace DatabaseCore.Migrations
                     b.HasKey("Id");
 
                     b.HasIndex("UserName")
-                        .IsUnique()
                         .HasFilter("[UserName] IS NOT NULL");
 
                     b.ToTable("Users");