After 7 days of repeated delivery failures, give up on inbox (#5131)

- A successful delivery cancels it out
- An incoming delivery from account of the inbox cancels it out

app/models/account.rb

@@ -190,7 +190,8 @@ class Account < ApplicationRecord
     end
 
     def inboxes
-      reorder(nil).where(protocol: :activitypub).pluck("distinct coalesce(nullif(accounts.shared_inbox_url, ''), accounts.inbox_url)")
+      urls = reorder(nil).where(protocol: :activitypub).pluck("distinct coalesce(nullif(accounts.shared_inbox_url, ''), accounts.inbox_url)")
+      DeliveryFailureTracker.filter(urls)
     end
 
     def triadic_closures(account, limit: 5, offset: 0)