Decorators in Practice — @validate, @log_calls, @require_auth

"Everything clicks together in this lesson. You've learned closures, the decorator pattern, functools.wraps, parameterisation, stacking, class-based decorators, and production patterns. Now you apply them all to the actual budget dashboard. You'll build the decorator library the dashboard uses: input validation, audit trail logging, authentication, caching, and budget enforcement. This is the decorator toolkit lesson — the one you refer back to when building real features."