feat(day22-node-redis-cache): add GET /item listing and expand mock DB to 50 items

feat(day22-node-redis-cache): add in-memory metrics and /metrics endpoint (JSON + prometheus-style)

feat(day22-node-redis-cache): add Node.js Redis cache-aside demo

chore(day21-bash-python-deploy): make deploy.sh executable and update deploy.status timestamps

feat(day21-bash-python-deploy): add lightweight health HTTP server (127.0.0.1:8081) that responds to /health with "ok" and silences access logs

feat(day21-bash-python-deploy): add GitHub Actions deploy template, systemd sample and status example; avoid eval in deploy.sh; document auto-deploy

feat(day21-bash-python-deploy): add deployment helper (deploy.sh), Python watcher, tests and README

feat(day20-csharp-inventory-api): add Inventory API (C# .NET) with CRUD, DI, validation, Swagger and tests

feat(day19-rails-event-booking): polish views & layout, add responsive styling and form UX; add clear_db script; update README with env-specific start instructions

feat(day19-rails-event-booking): add lightweight Sinatra + Sequel event-booking app with JSON API, models, views, tests, demos and run scripts

chore(day18-go-chat-server): expand README and simplify client rendering

feat(day18-go-chat-server): add minimal Go WebSocket chat server with static client

feat(day17-php-forum-api): show avatar initial and compute deterministic avatar bg/fg colors

fix(day17-php-forum-api): robust timestamp parsing, prevent auth token race, clear stale username & CSS tweak

feat(day17-php-forum-api): add minimal PHP Forum backend with frontend, DB migrations, repos, controllers, services, and tests