FEATURE: move stylesheet cache out of the uploads directory

app/models/stylesheet_cache.rb

@@ -0,0 +1,25 @@
+class StylesheetCache < ActiveRecord::Base
+  self.table_name = 'stylesheet_cache'
+
+  MAX_TO_KEEP = 10
+
+  def self.add(target,digest,content)
+    success = create(target: target, digest: digest, content: content)
+
+    count = StylesheetCache.count
+    if count > MAX_TO_KEEP
+
+      remove_lower = StylesheetCache.limit(MAX_TO_KEEP)
+                     .order('id desc')
+                     .pluck(:id)
+                     .last
+
+      exec_sql("DELETE FROM stylesheet_cache where id < :id", id: remove_lower)
+    end
+
+    success
+  rescue ActiveRecord::RecordNotUnique
+    false
+  end
+
+end