Script to fix misassigned tags

See https://github.com/basecamp/fizzy/pull/1879

script/maintenance/fix_cross_account_taggings.rb

@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+require_relative "../config/environment"
+
+cross_account_taggings = Tagging.joins(:tag).where("taggings.account_id != tags.account_id")
+
+puts "Found #{cross_account_taggings.count} cross-account taggings to fix"
+
+cross_account_taggings.find_each do |tagging|
+  correct_tag = tagging.account.tags.find_or_create_by!(title: tagging.tag.title)
+  tagging.update!(tag: correct_tag)
+  puts "Fixed tagging #{tagging.id}: reassigned to tag #{correct_tag.id} (#{correct_tag.title})"
+end
+
+puts "Done!"