Fix performance of percentile calculation for annual reports (#32765)

spec/lib/annual_report/percentiles_spec.rb

@@ -4,17 +4,20 @@ require 'rails_helper'
 
 RSpec.describe AnnualReport::Percentiles do
   describe '#generate' do
-    subject { described_class.new(account, Time.zone.now.year) }
+    subject { described_class.new(account, year) }
+
+    let(:year) { Time.zone.now.year }
 
     context 'with an inactive account' do
       let(:account) { Fabricate :account }
 
       it 'builds a report for an account' do
+        described_class.prepare(year)
+
         expect(subject.generate)
           .to include(
             percentiles: include(
-              followers: 0,
-              statuses: 0
+              statuses: 100
             )
           )
       end
@@ -25,16 +28,15 @@ RSpec.describe AnnualReport::Percentiles do
 
       before do
         Fabricate.times 2, :status # Others as `account`
-        Fabricate.times 2, :follow # Others as `target_account`
         Fabricate.times 2, :status, account: account
-        Fabricate.times 2, :follow, target_account: account
       end
 
       it 'builds a report for an account' do
+        described_class.prepare(year)
+
         expect(subject.generate)
           .to include(
             percentiles: include(
-              followers: 50,
               statuses: 50
             )
           )