Fix Tailwind CSS not loading in production

- Add stylesheet_pack_tag to load Webpacker's compiled CSS
- Create explicit Tailwind imports for asset pipeline fallback
- Configure file cache store with size limits to prevent cache buildup
- Add cache maintenance rake tasks for automatic cleanup
- Create whenever schedule for automated cache maintenance

The issue was that Tailwind was only included via Webpacker but the layout
wasn't loading Webpacker stylesheets in production.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/assets/stylesheets/tailwind.css

@@ -0,0 +1,4 @@
+/* Tailwind CSS imports */
+@tailwind base;
+@tailwind components;
+@tailwind utilities;

app/views/layouts/application.html.erb

@@ -5,6 +5,7 @@
   <%= csrf_meta_tags %>
 
   <%= stylesheet_link_tag 'application', media: 'all' %>
+  <%= stylesheet_pack_tag 'application', media: 'all' %>
   <!--
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css" integrity="sha256-rByPlHULObEjJ6XQxW/flG2r+22R5dKiAoef+aXWfik=" crossorigin="anonymous" />
   -->

config/environments/production.rb

@@ -57,6 +57,17 @@ Rails.application.configure do
   # Use a different cache store in production.
   # config.cache_store = :mem_cache_store
 
+  # File store cache with size limits and automatic expiration
+  config.cache_store = :file_store, Rails.root.join("tmp", "cache"), {
+    size: 256.megabytes,  # Maximum cache size (256MB should be plenty)
+    compress: true,       # Compress cached data to save space
+    compress_threshold: 1.kilobyte  # Compress anything over 1KB
+  }
+
+  # Set cache expiration for fragment caching
+  config.action_controller.perform_caching = true
+  config.action_controller.enable_fragment_cache_logging = false
+
   # Use a real queuing backend for Active Job (and separate queues per environment)
   # config.active_job.queue_adapter     = :resque
   # config.active_job.queue_name_prefix = "notebook_#{Rails.env}"

config/schedule.rb

@@ -0,0 +1,16 @@
+# This file is for the whenever gem (optional)
+# To use: add `gem 'whenever', require: false` to Gemfile
+# Then run: whenever --update-crontab
+
+# If not using whenever gem, add this manually to crontab with: crontab -e
+# 0 3 * * * cd /var/www/notebook && RAILS_ENV=production /home/ubuntu/.rbenv/shims/bundle exec rake cache:clear_old >> /var/www/notebook/log/cache_cleanup.log 2>&1
+
+# Clean up old cache files daily at 3 AM
+every 1.day, at: '3:00 am' do
+  rake "cache:clear_old"
+end
+
+# Show cache stats weekly (optional - for monitoring)
+every :sunday, at: '2:00 am' do
+  rake "cache:stats"
+end

lib/tasks/cache_maintenance.rake

@@ -0,0 +1,100 @@
+namespace :cache do
+  desc "Clear old cache files (older than 7 days)"
+  task :clear_old => :environment do
+    cache_dir = Rails.root.join('tmp', 'cache')
+
+    if Dir.exist?(cache_dir)
+      # Count files before cleanup
+      count_before = Dir.glob(File.join(cache_dir, '**', '*')).select { |file| File.file?(file) }.count
+
+      # Remove files older than 7 days
+      cutoff_time = 7.days.ago
+      removed_count = 0
+
+      Dir.glob(File.join(cache_dir, '**', '*')).each do |file|
+        if File.file?(file) && File.mtime(file) < cutoff_time
+          begin
+            File.delete(file)
+            removed_count += 1
+          rescue => e
+            Rails.logger.error "Failed to delete cache file #{file}: #{e.message}"
+          end
+        end
+      end
+
+      # Remove empty directories
+      Dir.glob(File.join(cache_dir, '**', '*')).reverse.each do |dir|
+        if File.directory?(dir) && Dir.empty?(dir)
+          begin
+            Dir.rmdir(dir)
+          rescue => e
+            Rails.logger.error "Failed to remove empty directory #{dir}: #{e.message}"
+          end
+        end
+      end
+
+      count_after = Dir.glob(File.join(cache_dir, '**', '*')).select { |file| File.file?(file) }.count
+
+      puts "Cache cleanup complete:"
+      puts "  Files before: #{count_before}"
+      puts "  Files removed: #{removed_count}"
+      puts "  Files after: #{count_after}"
+
+      Rails.logger.info "Cache cleanup: removed #{removed_count} files older than 7 days"
+    else
+      puts "Cache directory does not exist: #{cache_dir}"
+    end
+  end
+
+  desc "Clear all cache files (use with caution)"
+  task :clear_all => :environment do
+    Rails.cache.clear
+    puts "All cache files have been cleared"
+  end
+
+  desc "Show cache statistics"
+  task :stats => :environment do
+    cache_dir = Rails.root.join('tmp', 'cache')
+
+    if Dir.exist?(cache_dir)
+      files = Dir.glob(File.join(cache_dir, '**', '*')).select { |f| File.file?(f) }
+
+      total_files = files.count
+      total_size = files.sum { |f| File.size(f) rescue 0 }
+
+      # Group by age
+      now = Time.now
+      age_groups = {
+        "< 1 day" => 0,
+        "1-7 days" => 0,
+        "7-30 days" => 0,
+        "> 30 days" => 0
+      }
+
+      files.each do |file|
+        age_days = ((now - File.mtime(file)) / 86400).to_i rescue 999
+
+        if age_days < 1
+          age_groups["< 1 day"] += 1
+        elsif age_days <= 7
+          age_groups["1-7 days"] += 1
+        elsif age_days <= 30
+          age_groups["7-30 days"] += 1
+        else
+          age_groups["> 30 days"] += 1
+        end
+      end
+
+      puts "Cache Statistics:"
+      puts "  Total files: #{total_files}"
+      puts "  Total size: #{(total_size / 1024.0 / 1024.0).round(2)} MB"
+      puts ""
+      puts "Files by age:"
+      age_groups.each do |age, count|
+        puts "  #{age}: #{count} files"
+      end
+    else
+      puts "Cache directory does not exist: #{cache_dir}"
+    end
+  end
+end