Replace unused `by_recent_sign_in` scope (#28616)

app/models/account.rb

@@ -131,7 +131,7 @@ class Account < ApplicationRecord
   scope :discoverable, -> { searchable.without_silenced.where(discoverable: true).joins(:account_stat) }
   scope :followable_by, ->(account) { joins(arel_table.join(Follow.arel_table, Arel::Nodes::OuterJoin).on(arel_table[:id].eq(Follow.arel_table[:target_account_id]).and(Follow.arel_table[:account_id].eq(account.id))).join_sources).where(Follow.arel_table[:id].eq(nil)).joins(arel_table.join(FollowRequest.arel_table, Arel::Nodes::OuterJoin).on(arel_table[:id].eq(FollowRequest.arel_table[:target_account_id]).and(FollowRequest.arel_table[:account_id].eq(account.id))).join_sources).where(FollowRequest.arel_table[:id].eq(nil)) }
   scope :by_recent_status, -> { includes(:account_stat).merge(AccountStat.order('last_status_at DESC NULLS LAST')).references(:account_stat) }
-  scope :by_recent_sign_in, -> { order(Arel.sql('users.current_sign_in_at DESC NULLS LAST')) }
+  scope :by_recent_activity, -> { left_joins(:user, :account_stat).order(coalesced_activity_timestamps.desc).order(id: :desc) }
   scope :popular, -> { order('account_stats.followers_count desc') }
   scope :by_domain_and_subdomains, ->(domain) { where(domain: Instance.by_domain_and_subdomains(domain).select(:domain)) }
   scope :not_excluded_by_account, ->(account) { where.not(id: account.excluded_from_timeline_account_ids) }
@@ -444,6 +444,14 @@ class Account < ApplicationRecord
       DeliveryFailureTracker.without_unavailable(urls)
     end
 
+    def coalesced_activity_timestamps
+      Arel.sql(
+        <<~SQL.squish
+          COALESCE(users.current_sign_in_at, account_stats.last_status_at, to_timestamp(0))
+        SQL
+      )
+    end
+
     def from_text(text)
       return [] if text.blank?
 

app/models/account_filter.rb

@@ -104,15 +104,7 @@ class AccountFilter
   def order_scope(value)
     case value.to_s
     when 'active'
-      accounts_with_users
-        .left_joins(:account_stat)
-        .order(
-          Arel.sql(
-            <<~SQL.squish
-              COALESCE(users.current_sign_in_at, account_stats.last_status_at, to_timestamp(0)) DESC, accounts.id DESC
-            SQL
-          )
-        )
+      Account.by_recent_activity
     when 'recent'
       Account.recent
     else