Change AccountRelationshipSeveranceEvent model to store lost followers and following counts separately (#29714)

app/javascript/mastodon/features/notifications/components/relationships_severance_event.jsx

@@ -35,7 +35,7 @@ const RelationshipsSeveranceEvent = ({ event, hidden }) => {
             <FormattedMessage
               id='relationship_severance_notification.relationships'
               defaultMessage='{count, plural, one {# relationship} other {# relationships}}'
-              values={{ count: event.get('relationships_count', 0) }}
+              values={{ count: event.get('followers_count', 0) + event.get('following_count', 0) }}
             />
           )}
           <br />

app/models/account_relationship_severance_event.rb

@@ -8,11 +8,16 @@
 #  id                              :bigint(8)        not null, primary key
 #  account_id                      :bigint(8)        not null
 #  relationship_severance_event_id :bigint(8)        not null
-#  relationships_count             :integer          default(0), not null
 #  created_at                      :datetime         not null
 #  updated_at                      :datetime         not null
+#  followers_count                 :integer          default(0), not null
+#  following_count                 :integer          default(0), not null
 #
 class AccountRelationshipSeveranceEvent < ApplicationRecord
+  self.ignored_columns += %w(
+    relationships_count
+  )
+
   belongs_to :account
   belongs_to :relationship_severance_event
 
@@ -30,6 +35,7 @@ class AccountRelationshipSeveranceEvent < ApplicationRecord
   private
 
   def set_relationships_count!
-    self.relationships_count = severed_relationships.about_local_account(account).count
+    self.followers_count = severed_relationships.about_local_account(account).passive.count
+    self.following_count = severed_relationships.about_local_account(account).active.count
   end
 end

app/serializers/rest/account_relationship_severance_event_serializer.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class REST::AccountRelationshipSeveranceEventSerializer < ActiveModel::Serializer
-  attributes :id, :type, :purged, :target_name, :created_at
+  attributes :id, :type, :purged, :target_name, :followers_count, :following_count, :created_at
 
   def id
     object.id.to_s

app/views/severed_relationships/index.html.haml

@@ -21,13 +21,13 @@
               %td{ rowspan: 2 }= t('severed_relationships.purged')
             - else
               %td
-                - count = event.severed_relationships.active.about_local_account(current_account).count
+                - count = event.following_count
                 - if count.zero?
                   = t('generic.none')
                 - else
                   = table_link_to 'download', t('severed_relationships.download', count: count), following_severed_relationship_path(event, format: :csv)
               %td
-                - count = event.severed_relationships.passive.about_local_account(current_account).count
+                - count = event.followers_count
                 - if count.zero?
                   = t('generic.none')
                 - else