aliases/implications: don't destroy removed aliases (#4024).

app/models/tag_alias.rb

@@ -188,11 +188,10 @@ class TagAlias < TagRelationship
     end
   end
 
-  def reject!
+  def reject!(update_topic: true)
     update(status: "deleted")
     clear_all_cache
-    forum_updater.update(reject_message(CurrentUser.user), "REJECTED")
-    destroy
+    forum_updater.update(reject_message(CurrentUser.user), "REJECTED") if update_topic
   end
 
   def wiki_pages_present

app/models/tag_implication.rb

@@ -169,10 +169,9 @@ class TagImplication < TagRelationship
       delay(:queue => "default").process!(update_topic: update_topic)
     end
 
-    def reject!
+    def reject!(update_topic: true)
       update(status: "deleted")
-      forum_updater.update(reject_message(CurrentUser.user), "REJECTED")
-      destroy
+      forum_updater.update(reject_message(CurrentUser.user), "REJECTED") if update_topic
     end
 
     def create_mod_action

app/models/tag_relationship.rb

@@ -16,6 +16,7 @@ class TagRelationship < ApplicationRecord
   has_one :consequent_wiki, through: :consequent_tag, source: :wiki_page
 
   scope :active, ->{where(status: "active")}
+  scope :deleted, ->{where(status: "deleted")}
   scope :expired, ->{where("created_at < ?", EXPIRY.days.ago)}
   scope :old, ->{where("created_at >= ? and created_at < ?", EXPIRY.days.ago, EXPIRY_WARNING.days.ago)}
   scope :pending, ->{where(status: "pending")}