Созданы модели сущностей

Forum/ForumContracts/ForumContracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Forum/ForumDataModels/ICategoryModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ForumDataModels
+{
+    public interface ICategoryModel : IId
+    {
+        string Name { get; }
+    }
+}

Forum/ForumDataModels/IId.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ForumDataModels
+{
+    public interface IId
+    {
+        int Id { get; }
+    }
+}

Forum/ForumDataModels/IMessageModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ForumDataModels
+{
+    public interface IMessageModel : IId
+    {
+        string Text { get; }
+        DateTime Date { get; }
+    }
+}

Forum/ForumDataModels/IRoleModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ForumDataModels
+{
+    public interface IRoleModel : IId
+    {
+        string Name { get; }
+    }
+}

Forum/ForumDataModels/ITopicModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ForumDataModels
+{
+    public interface ITopicModel : IId
+    {
+        string Name { get; }
+    }
+}

Forum/ForumDataModels/IUserModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ForumDataModels
+{
+    public interface IUserModel : IId
+    {
+        string Username { get; }
+        string Email { get; }
+        string Password { get; }
+        DateTime RegistrationDate { get; }
+    }
+}