Change hashtag trends to be stored in the database instead of redis (#32837)

Co-authored-by: David Roetzel <david@roetzel.de>

spec/fabricators/tag_trend_fabricator.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+Fabricator(:tag_trend) do
+  tag
+end

spec/mailers/admin_mailer_spec.rb

@@ -71,6 +71,7 @@ RSpec.describe AdminMailer do
     before do
       PreviewCardTrend.create!(preview_card: link)
       StatusTrend.create!(status: status, account: Fabricate(:account))
+      TagTrend.create!(tag: tag)
       recipient.user.update(locale: :en)
     end
 

spec/models/tag_trend_spec.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe TagTrend do
+  include_examples 'RankedTrend'
+
+  describe 'Associations' do
+    it { is_expected.to belong_to(:tag).required }
+  end
+end

spec/models/trends/tags_spec.rb

@@ -61,10 +61,10 @@ RSpec.describe Trends::Tags do
 
     it 'decays scores' do
       subject.refresh(yesterday + 12.hours)
-      original_score = subject.score(tag_ocs.id)
+      original_score = TagTrend.find_by(tag: tag_ocs).score
       expect(original_score).to eq 144.0
       subject.refresh(yesterday + 12.hours + subject.options[:max_score_halflife])
-      decayed_score = subject.score(tag_ocs.id)
+      decayed_score = TagTrend.find_by(tag: tag_ocs).score
       expect(decayed_score).to be <= original_score / 2
     end
   end