Убрал сущность "исполнитель", добавил вместо нее сущность пользователя и перечисление ролей. Заменил в моделях ссылки на исполнитля ссылками на пользователя.

Polyclinic/PolyclinicContracts/BindingModels/DiagnosisBindingModel.cs

@@ -6,7 +6,7 @@ namespace PolyclinicContracts.BindingModels
     {
         public string Name { get; set; } = string.Empty;
         public string Comment { get; set; } = string.Empty;
-        public int ExecutorId { get; set; }
+        public int UserId { get; set; }
         public int Id { get; set; }
     }
 }

Polyclinic/PolyclinicContracts/BindingModels/UserBindingModel.cs

@@ -1,12 +1,14 @@
-using PolyclinicDataModels.Models;
+using PolyclinicDataModels.Enums;
+using PolyclinicDataModels.Models;
 
 namespace PolyclinicContracts.BindingModels
 {
-    public class ExecutorBindingModel : IExecutorModel
+    public class UserBindingModel : IUserModel
     {
         public string FIO { get; set; } = string.Empty;
         public string Email { get; set; } = string.Empty;
         public string Password { get; set; } = string.Empty;
+        public UserRole Role { get; set; } = UserRole.Неизвестный;
         public int Id { get; set; }
     }
 }

Polyclinic/PolyclinicContracts/BusinessLogicsContracts/IExecutorLogic.cs

@@ -1,15 +0,0 @@
-using PolyclinicContracts.BindingModels;
-using PolyclinicContracts.SearchModels;
-using PolyclinicContracts.ViewModels;
-
-namespace PolyclinicContracts.BusinessLogicsContracts
-{
-    public interface IExecutorLogic
-    {
-        List<ExecutorViewModel>? ReadList(ExecutorSearchModel? model);
-        ExecutorViewModel? ReadElement(ExecutorSearchModel model);
-        bool Create(ExecutorBindingModel model);
-        bool Update(ExecutorBindingModel model);
-        bool Delete(ExecutorBindingModel model);
-    }
-}

Polyclinic/PolyclinicContracts/BusinessLogicsContracts/IUserLogic.cs

@@ -0,0 +1,15 @@
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicContracts.BusinessLogicsContracts
+{
+    public interface IUserLogic
+    {
+        List<UserViewModel>? ReadList(UserSearchModel? model);
+        UserViewModel? ReadElement(UserSearchModel model);
+        bool Create(UserBindingModel model);
+        bool Update(UserBindingModel model);
+        bool Delete(UserBindingModel model);
+    }
+}

Polyclinic/PolyclinicContracts/SearchModels/DiagnosisSearchModel.cs

@@ -3,6 +3,6 @@
     public class DiagnosisSearchModel
     {
         public int? Id { get; set; }
-        public int? ExecutorId { get; set; }
+        public int? UserId { get; set; }
     }
 }

Polyclinic/PolyclinicContracts/SearchModels/UserSearchModel.cs

@@ -1,6 +1,6 @@
 namespace PolyclinicContracts.SearchModels
 {
-    public class ExecutorSearchModel
+    public class UserSearchModel
     {
         public int? Id { get; set; }
         public string? Email { get; set; }

Polyclinic/PolyclinicContracts/StoragesContracts/IExecutorStorage.cs

@@ -1,16 +0,0 @@
-using PolyclinicContracts.BindingModels;
-using PolyclinicContracts.SearchModels;
-using PolyclinicContracts.ViewModels;
-
-namespace PolyclinicContracts.StoragesContracts
-{
-    public interface IExecutorStorage
-    {
-        List<ExecutorViewModel> GetFullList();
-        List<ExecutorViewModel> GetFilteredList(ExecutorSearchModel model);
-        ExecutorViewModel? GetElement(ExecutorSearchModel model);
-        ExecutorViewModel? Insert(ExecutorBindingModel model);
-        ExecutorViewModel? Update(ExecutorBindingModel model);
-        ExecutorViewModel? Delete(ExecutorBindingModel model);
-    }
-}

Polyclinic/PolyclinicContracts/StoragesContracts/IUserStorage.cs

@@ -0,0 +1,16 @@
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.ViewModels;
+
+namespace PolyclinicContracts.StoragesContracts
+{
+    public interface IUserStorage
+    {
+        List<UserViewModel> GetFullList();
+        List<UserViewModel> GetFilteredList(UserSearchModel model);
+        UserViewModel? GetElement(UserSearchModel model);
+        UserViewModel? Insert(UserBindingModel model);
+        UserViewModel? Update(UserBindingModel model);
+        UserViewModel? Delete(UserBindingModel model);
+    }
+}

Polyclinic/PolyclinicContracts/ViewModels/DiagnosisViewModel.cs

@@ -9,7 +9,7 @@ namespace PolyclinicContracts.ViewModels
         public string Name { get; set; } = string.Empty;
         [DisplayName("Комментарий")]
         public string Comment { get; set; } = string.Empty;
-        public int ExecutorId { get; set; }
+        public int UserId { get; set; }
         public int Id { get; set; }
     }
 }

Polyclinic/PolyclinicContracts/ViewModels/ExecutorViewModel.cs

@@ -1,15 +0,0 @@
-using PolyclinicDataModels.Models;
-using System.ComponentModel;
-
-namespace PolyclinicContracts.ViewModels
-{
-    public class ExecutorViewModel : IExecutorModel
-    {
-        [DisplayName("ФИО исполнителя")]
-        public string FIO { get; set; } = string.Empty;
-        [DisplayName("Email исполнителя")]
-        public string Email { get; set; } = string.Empty;
-        public string Password { get; set; } = string.Empty;
-        public int Id { get; set; }
-    }
-}

Polyclinic/PolyclinicContracts/ViewModels/UserViewModel.cs

@@ -0,0 +1,19 @@
+using PolyclinicDataModels.Enums;
+using PolyclinicDataModels.Models;
+using System.ComponentModel;
+
+namespace PolyclinicContracts.ViewModels
+{
+    public class UserViewModel : IUserModel
+    {
+        [DisplayName("ФИО")]
+        public string FIO { get; set; } = string.Empty;
+        [DisplayName("Email")]
+        public string Email { get; set; } = string.Empty;
+        [DisplayName("Пароль")]
+        public string Password { get; set; } = string.Empty;
+        [DisplayName("Роль")]
+        public UserRole Role { get; set; } = UserRole.Неизвестный;
+        public int Id { get; set; }
+    }
+}

Polyclinic/PolyclinicDataModels/Enums/UserRole.cs

@@ -0,0 +1,10 @@
+namespace PolyclinicDataModels.Enums
+{
+    public enum UserRole
+    {
+        Неизвестный = -1,
+        Администратор = 0,
+        Исполнитель = 1,
+        Поручитель = 2
+    }
+}

Polyclinic/PolyclinicDataModels/Models/IDiagnosisModel.cs

@@ -4,6 +4,6 @@
     {
         string Name { get; }
         string Comment { get; }
-        int ExecutorId { get; }
+        int UserId { get; }
     }
 }

Polyclinic/PolyclinicDataModels/Models/IExecutorModel.cs

@@ -1,9 +0,0 @@
-namespace PolyclinicDataModels.Models
-{
-    public interface IExecutorModel : IId
-    {
-        string FIO {  get; }
-        string Email { get; }
-        string Password { get; }
-    }
-}

Polyclinic/PolyclinicDataModels/Models/ISuretorModel.cs

@@ -1,15 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace PolyclinicDataModels.Models
-{
-    public interface ISuretorModel : IId
-    {
-        string FIO { get; }
-        string Password { get; }
-        string Email { get; }
-    }
-}

Polyclinic/PolyclinicDataModels/Models/IUserModel.cs

@@ -0,0 +1,12 @@
+using PolyclinicDataModels.Enums;
+
+namespace PolyclinicDataModels.Models
+{
+    public interface IUserModel : IId
+    {
+        string FIO { get; }
+        string Email { get; }
+        string Password { get; }
+        UserRole Role { get; }
+    }
+}