Delete solution tags when resetting account

app/commands/user/reset_account.rb

@@ -65,6 +65,7 @@ def reset_associations!
     user.scratchpad_pages.delete_all
     user.solution_stars.delete_all
     user.challenges.delete_all
+    user.solution_tags.update_all(user_id: User::GHOST_USER_ID)
   end
 
   def reset_badges!

app/models/user.rb

@@ -103,6 +103,7 @@ class User < ApplicationRecord
 
   has_many :solution_comments, dependent: :destroy, class_name: "Solution::Comment", inverse_of: :author
   has_many :solution_stars, dependent: :destroy, class_name: "Solution::Star"
+  has_many :solution_tags, dependent: :destroy, class_name: "Solution::Tag"
 
   has_many :track_mentorships, dependent: :destroy
   has_many :mentored_tracks, through: :track_mentorships, source: :track

test/commands/user/reset_account_test.rb

@@ -180,6 +180,14 @@ class User::ResetAccountTest < ActiveSupport::TestCase
     end
   end
 
+  test "cleans up solution_tags" do
+    ghost_user = create :user, :ghost
+    user = create :user
+    solution_tag = create(:solution_tag, user:)
+    User::ResetAccount.(user)
+    assert_equal ghost_user, solution_tag.reload.user
+  end
+
   test "cleans up problem reports" do
     create :user, :ghost
     user = create :user