Only distribute statuses to followers who signed in in the last 2 weeks, add rake task for clearing feeds of inactive users

lib/tasks/mastodon.rake

@@ -36,8 +36,16 @@ namespace :mastodon do
   end
 
   namespace :feeds do
-    desc 'Clears all timelines so that they would be regenerated on next hit'
+    desc 'Clear timelines of inactive users'
     task clear: :environment do
+      User.where('current_sign_in_at < ?', 14.days.ago).find_each do |user|
+        Redis.current.del(FeedManager.instance.key(:home, user.account_id))
+        Redis.current.del(FeedManager.instance.key(:mentions, user.account_id))
+      end
+    end
+
+    desc 'Clears all timelines so that they would be regenerated on next hit'
+    task clear_all: :environment do
       Redis.current.keys('feed:*').each { |key| Redis.current.del(key) }
     end
   end