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

app/services/fan_out_on_write_service.rb

@@ -24,7 +24,7 @@ class FanOutOnWriteService < BaseService
   def deliver_to_followers(status)
     Rails.logger.debug "Delivering status #{status.id} to followers"
 
-    status.account.followers.where(domain: nil).find_each do |follower|
+    status.account.followers.where(domain: nil).joins(:user).where('users.current_sign_in_at > ?', 14.days.ago).find_each do |follower|
       next if FeedManager.instance.filter?(:home, status, follower)
       FeedManager.instance.push(:home, follower, status)
     end

config/environments/production.rb

@@ -50,7 +50,8 @@ Rails.application.configure do
     host: ENV.fetch('REDIS_HOST') { 'localhost' },
     port: ENV.fetch('REDIS_PORT') { 6379 },
     db: 0,
-    namespace: 'cache'
+    namespace: 'cache',
+    expires_in: 20.minutes
   }
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.

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