post_tags の論理削除と履歴管理を廃止 (#411) (#417)

Reviewed-on: #417
Co-authored-by: miteruzo <miteruzo@naver.com>

backend/app/services/post_creator.rb

@@ -121,9 +121,11 @@ class PostCreator
   def sync_post_tags! post, desired_tags, sections
     desired_ids = desired_tags.map(&:id).to_set
     current_ids = post.tags.pluck(:id).to_set
+
     Tag.where(id: desired_ids - current_ids).find_each do |tag|
       PostTag.create_or_find_by!(post:, tag:, created_user: @actor)
     end
+
     PostTagSection.where(post_id: post.id).destroy_all
     sections.each do |tag_id, ranges|
       ranges.each do |begin_ms, end_ms|
@@ -133,10 +135,9 @@ class PostCreator
                                end_ms:)
       end
     end
+
     PostTag.where(post_id: post.id,
-                  tag_id: (current_ids - desired_ids).to_a).kept.find_each do |post_tag|
-      post_tag.discard_by!(@actor)
-    end
+                  tag_id: (current_ids - desired_ids).to_a).destroy_all
   end
 
   def sync_parent_posts! post, ids