Add scheduled job to clean up orphaned inbox entries

app/workers/scheduler/inbox_cleanup_scheduler.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class Scheduler::InboxCleanupScheduler
+  include Sidekiq::Worker
+
+  sidekiq_options retry: false
+
+  def perform
+    orphaned_entries = Inbox.where(question_id: nil).includes(:user)
+    orphaned_entries.each do |inbox|
+      logger.info "Deleting orphaned inbox entry #{inbox.id} from user #{inbox.user.id}"
+      inbox.destroy
+    end
+  end
+end

config/sidekiq.yml

@@ -13,4 +13,11 @@ production:
   - question
   - export
   - push_notification
+  - scheduler
 
+:scheduler:
+  :schedule:
+    inbox_cleanup:
+      every: 1m
+      class: Scheduler::InboxCleanupScheduler
+      queue: scheduler