Add more logging and trace parameters

src/Vegasco.Server.Api/Cars/CreateCar.cs

@@ -39,19 +39,41 @@ public static class CreateCar
 		IEnumerable<IValidator<Request>> validators,
 		ApplicationDbContext dbContext,
 		UserAccessor userAccessor,
+		ILoggerFactory loggerFactory,
 		CancellationToken cancellationToken)
 	{
+		ILogger logger = loggerFactory.CreateLogger(nameof(CreateCar));
+		
 		List<ValidationResult> failedValidations = await validators.ValidateAllAsync(request, cancellationToken: cancellationToken);
 		if (failedValidations.Count > 0)
 		{
+			logger.LogDebug(
+				"Validation failed for request {@Request} with errors {@Errors}",
+				request,
+				failedValidations
+					.Where(x => !x.IsValid)
+					.SelectMany(x => x.Errors)
+					.Select(x => x.ErrorMessage));
+
 			return TypedResults.BadRequest(new HttpValidationProblemDetails(failedValidations.ToCombinedDictionary()));
 		}
 
+		bool isDuplicate = await dbContext.Cars
+			.AnyAsync(x => x.Name.ToUpper() == request.Name.ToUpper(), cancellationToken);
+
+		if (isDuplicate)
+		{
+			logger.LogDebug("Car with name '{CarName}' (case insensitive) already exists", request.Name);
+			return TypedResults.Conflict();
+		}
+
 		string userId = userAccessor.GetUserId();
 
 		User? user = await dbContext.Users.FindAsync([userId], cancellationToken: cancellationToken);
 		if (user is null)
 		{
+			logger.LogDebug("User with ID '{UserId}' not found, creating new user", userId);
+
 			user = new User
 			{
 				Id = userId
@@ -65,17 +87,11 @@ public static class CreateCar
 			UserId = userId
 		};
 
-		bool isDuplicate = await dbContext.Cars
-			.AnyAsync(x => x.Name.ToUpper() == request.Name.ToUpper(), cancellationToken);
-
-		if (isDuplicate)
-		{
-			return TypedResults.Conflict();
-		}
-
 		await dbContext.Cars.AddAsync(car, cancellationToken);
 		await dbContext.SaveChangesAsync(cancellationToken);
 
+		logger.LogTrace("Created new car: {@Car}", car);
+
 		Response response = new(car.Id.Value, car.Name);
 		return TypedResults.Created($"/v1/cars/{car.Id}", response);
 	}

src/Vegasco.Server.Api/Cars/DeleteCar.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using System.Diagnostics;
 using Vegasco.Server.Api.Persistence;
 
 namespace Vegasco.Server.Api.Cars;
@@ -21,6 +22,9 @@ public static class DeleteCar
 		ILoggerFactory loggerFactory,
 		CancellationToken cancellationToken)
 	{
+		Activity? activity = Activity.Current;
+		activity?.SetTag("id", id);
+
 		int rows = await dbContext.Cars
 			.Where(x => x.Id == new CarId(id))
 			.ExecuteDeleteAsync(cancellationToken);

src/Vegasco.Server.Api/Cars/GetCars.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using System.Diagnostics;
 using Vegasco.Server.Api.Persistence;
 
 namespace Vegasco.Server.Api.Cars;
@@ -34,11 +35,15 @@ public static class GetCars
 		ApplicationDbContext dbContext,
 		CancellationToken cancellationToken)
 	{
+		Activity? activity = Activity.Current;
+		
 		List<ResponseDto> cars = await dbContext.Cars
 			.Select(x => new ResponseDto(x.Id.Value, x.Name))
 			.ToListAsync(cancellationToken);
 
-		ApiResponse response = new ApiResponse
+		activity?.SetTag("carCount", cars.Count);
+		
+		ApiResponse response = new()
 		{
 			Cars = cars
 		};

src/Vegasco.Server.Api/Cars/UpdateCar.cs

@@ -10,6 +10,7 @@ namespace Vegasco.Server.Api.Cars;
 public static class UpdateCar
 {
 	public record Request(string Name);
+
 	public record Response(Guid Id, string Name);
 
 	public static RouteHandlerBuilder MapEndpoint(IEndpointRouteBuilder builder)
@@ -40,11 +41,22 @@ public static class UpdateCar
 		IEnumerable<IValidator<Request>> validators,
 		ApplicationDbContext dbContext,
 		UserAccessor userAccessor,
+		ILoggerFactory loggerFactory,
 		CancellationToken cancellationToken)
 	{
+		var logger = loggerFactory.CreateLogger(nameof(UpdateCar));
+
 		List<ValidationResult> failedValidations = await validators.ValidateAllAsync(request, cancellationToken);
 		if (failedValidations.Count > 0)
 		{
+			logger.LogDebug(
+				"Validation failed for request {@Request} with errors {@Errors}",
+				request,
+				failedValidations
+					.Where(x => !x.IsValid)
+					.SelectMany(x => x.Errors)
+					.Select(x => x.ErrorMessage));
+
 			return TypedResults.BadRequest(new HttpValidationProblemDetails(failedValidations.ToCombinedDictionary()));
 		}
 
@@ -60,13 +72,16 @@ public static class UpdateCar
 
 		if (isDuplicate)
 		{
+			logger.LogDebug("Car with name '{CarName}' (case insensitive) already exists", request.Name);
 			return TypedResults.Conflict();
 		}
 
 		car.Name = request.Name.Trim();
 		await dbContext.SaveChangesAsync(cancellationToken);
 
+		logger.LogTrace("Updated car: {@Car}", car);
+
 		Response response = new(car.Id.Value, car.Name);
 		return TypedResults.Ok(response);
 	}
-}
+}