Restructure project

API/API.Core/API.Core.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <RootNamespace>WebAPI</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.11" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
+  </ItemGroup>
+  
+  <ItemGroup>
+    <Folder Include="Infrastructure\" />
+  </ItemGroup>
+  
+  <ItemGroup>
+    <ProjectReference Include="..\..\Repository\Repository.Core\Repository.Core.csproj" />
+    <ProjectReference Include="..\..\Service\Service.Core\Service.Core.csproj" />
+  </ItemGroup>
+</Project>

API/API.Core/Controllers/NotFoundController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace WebAPI.Controllers
+{
+    [ApiController]
+    [ApiExplorerSettings(IgnoreApi = true)]
+    [Route("error")] // ← required
+    public class NotFoundController : ControllerBase
+    {
+        [HttpGet("404")] // ← required
+        public IActionResult Handle404()
+        {
+            return NotFound(new { message = "Route not found." });
+        }
+    }
+}

API/API.Core/Controllers/UserController.cs

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+using BusinessLayer.Services;
+using DataAccessLayer.Entities;
+using Microsoft.AspNetCore.Mvc;
+
+namespace WebAPI.Controllers
+{
+    [ApiController]
+    [Route("api/[controller]")]
+    public class UserController(IUserService userService) : ControllerBase
+    {
+        [HttpGet]
+        public async Task<ActionResult<IEnumerable<UserAccount>>> GetAll([FromQuery] int? limit, [FromQuery] int? offset)
+        {
+            var users = await userService.GetAllAsync(limit, offset);
+            return Ok(users);
+        }
+
+        [HttpGet("{id:guid}")]
+        public async Task<ActionResult<UserAccount>> GetById(Guid id)
+        {
+            var user = await userService.GetByIdAsync(id);
+            if (user is null) return NotFound();
+            return Ok(user);
+        }
+    }
+}

API/API.Core/Program.cs

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+using BusinessLayer.Services;
+using DataAccessLayer.Repositories;
+using DataAccessLayer.Sql;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddControllers();
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+builder.Services.AddOpenApi();
+
+// Dependency Injection
+builder.Services.AddSingleton<ISqlConnectionFactory, DefaultSqlConnectionFactory>();
+builder.Services.AddScoped<IUserAccountRepository, UserAccountRepository>();
+builder.Services.AddScoped<IUserService, UserService>();
+var app = builder.Build();
+
+app.UseSwagger();
+app.UseSwaggerUI();
+app.MapOpenApi();
+
+app.UseHttpsRedirection();
+app.MapControllers();
+app.MapFallbackToController("Handle404", "NotFound");
+app.Run();

API/API.Core/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5069",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "https://localhost:7002;http://localhost:5069",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

API/API.Core/WebAPI.http

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+@WebAPI_HostAddress = http://localhost:5069
+
+GET {{WebAPI_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###
+
+GET {{WebAPI_HostAddress}}/api/users
+Accept: application/json
+
+###
+
+GET {{WebAPI_HostAddress}}/api/users/{{userId}}
+Accept: application/json
+
+###
+
+GET {{WebAPI_HostAddress}}/api/users/by-username/{{username}}
+Accept: application/json
+
+###
+
+GET {{WebAPI_HostAddress}}/api/users/by-email/{{email}}
+Accept: application/json
+
+###
+
+POST {{WebAPI_HostAddress}}/api/users
+Content-Type: application/json
+Accept: application/json
+
+{
+  "userAccountID": "00000000-0000-0000-0000-000000000000",
+  "username": "testuser",
+  "firstName": "Test",
+  "lastName": "User",
+  "email": "testuser@example.com",
+  "createdAt": "2025-01-01T00:00:00Z",
+  "updatedAt": null,
+  "dateOfBirth": "1990-01-01T00:00:00Z",
+  "timer": null
+}
+
+###
+
+PUT {{WebAPI_HostAddress}}/api/users/{{userId}}
+Content-Type: application/json
+Accept: application/json
+
+{
+  "userAccountID": "{{userId}}",
+  "username": "testuser",
+  "firstName": "Updated",
+  "lastName": "User",
+  "email": "testuser@example.com",
+  "createdAt": "2025-01-01T00:00:00Z",
+  "updatedAt": "2025-02-01T00:00:00Z",
+  "dateOfBirth": "1990-01-01T00:00:00Z",
+  "timer": null
+}
+
+###
+
+DELETE {{WebAPI_HostAddress}}/api/users/{{userId}}

API/API.Core/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

API/API.Core/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}