Fix #4940: DanbooruBot retiring banned_artist implications.

app/logical/tag_relationship_retirement_service.rb

@@ -40,13 +40,20 @@ module TagRelationshipRetirementService
   end
 
   def inactive_relationships
-    (inactive_aliases + TagAlias.active.empty + TagImplication.active.empty).uniq
+    (inactive_aliases + inactive_implications).uniq
+  end
+
+  def inactive_implications
+    TagImplication.active.empty.where.not(consequent_name: "banned_artist")
   end
 
   def inactive_aliases
     aliases = TagAlias.general.or(TagAlias.artist).active.where("tag_aliases.created_at < ?", THRESHOLD.ago)
-    aliases.select do |tag_alias|
+    aliases = aliases.select do |tag_alias|
       !tag_alias.consequent_tag.posts.exists?(["created_at > ?", THRESHOLD.ago])
     end
+
+    aliases += TagAlias.active.empty
+    aliases
   end
 end