[stphnwlsh]

Summary

Until now nothing we wrote logged anything, and the one log line per request was wrong for errors. This gives each request a clear trail, the same as CleanMinimalApi #66.

• LoggingBehaviour wraps every use case and logs how it ended, at Information, with the request name and its time in milliseconds: handled, failed validation (with the property names, never the values) or found nothing. It's registered before ValidationBehaviour, so it sees validation failures too. The messages are [LoggerMessage] source-generated, and the time comes from TimeProvider.
• Unexpected exceptions are logged. ApplicationExceptionHandler now logs anything it turns into a 500 as Error, with the exception. Handling an exception stops ASP.NET Core logging it, so before this a crash left only a status code behind.
• The request log runs before the exception handler. It used to sit after it, so it saw the exception on its way out and logged every 400 and 404 as a 500, stack trace and all. Now each request is logged once with the status the client got.
• Information is the default level, and appsettings.local.json lowers it to Debug.
• TimeProvider.System is registered with TryAddSingleton in both AddApplication and AddInfrastructure, so each layer works on its own without registering the clock twice.
• FakeLogger (Microsoft.Extensions.Diagnostics.Testing, MIT) checks the messages in the behaviour and handler tests.
• The serilog, mediator, time-provider, errors-and-exceptions, unit-tests and api-conventions skills describe all of this.

[github-actions]

Build Pipeline

✅ Ready to merge. Every stage passed.

Stage	Result	Details
Build	🟢 Passed	Version 2026.11.03.141-pr-40 · Template package 191 KB
Test	🟢 Passed	222 passed · 0 failed · 0 skipped · Template installs, builds and passes its tests
Coverage	🟢 Passed	100% (602 of 602 lines) · Needs 95%
Static Analysis	🟢 Passed	No open CodeQL alerts
Dependency Review	🟢 Passed	0 vulnerable packages · 0 licence problems
Container Scan	🟢 Passed	Image starts and answers · No open Trivy alerts

_{Commit 18ce52d · Full run}