Fix: 限定投稿新規追加時の負荷 (#321)

db/migrate/20231130083634_add_index_on_statuses_conversation_id.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddIndexOnStatusesConversationId < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :statuses, :conversation_id, algorithm: :concurrently
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_11_30_031209) do
+ActiveRecord::Schema[7.1].define(version: 2023_11_30_083634) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -1238,6 +1238,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_30_031209) do
     t.index ["account_id", "id", "visibility", "updated_at"], name: "index_statuses_20190820", order: { id: :desc }, where: "(deleted_at IS NULL)"
     t.index ["account_id", "reblog_of_id", "deleted_at", "searchability"], name: "index_statuses_for_get_following_accounts_to_search", where: "((deleted_at IS NULL) AND (reblog_of_id IS NULL) AND (searchability = ANY (ARRAY[0, 10, 1])))"
     t.index ["account_id"], name: "index_statuses_on_account_id"
+    t.index ["conversation_id"], name: "index_statuses_on_conversation_id"
     t.index ["deleted_at"], name: "index_statuses_on_deleted_at", where: "(deleted_at IS NOT NULL)"
     t.index ["id", "account_id"], name: "index_statuses_local_20190824", order: { id: :desc }, where: "((local OR (uri IS NULL)) AND (deleted_at IS NULL) AND (visibility = 0) AND (reblog_of_id IS NULL) AND ((NOT reply) OR (in_reply_to_account_id = account_id)))"
     t.index ["id", "account_id"], name: "index_statuses_public_20200119", order: { id: :desc }, where: "((deleted_at IS NULL) AND (visibility = 0) AND (reblog_of_id IS NULL) AND ((NOT reply) OR (in_reply_to_account_id = account_id)))"