Change algorithm of follow recommendations (#28314)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/models/follow_recommendation_mute.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: follow_recommendation_mutes
+#
+#  id                :bigint(8)        not null, primary key
+#  account_id        :bigint(8)        not null
+#  target_account_id :bigint(8)        not null
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#
+class FollowRecommendationMute < ApplicationRecord
+  belongs_to :account
+  belongs_to :target_account, class_name: 'Account'
+
+  validates :target_account, uniqueness: { scope: :account_id }
+
+  after_commit :invalidate_follow_recommendations_cache
+
+  private
+
+  def invalidate_follow_recommendations_cache
+    Rails.cache.delete("follow_recommendations/#{account_id}")
+  end
+end