Remove PubSubHubbub-related columns from accounts table (#16170)

db/post_migrate/20210507001928_remove_hub_url_from_accounts.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class RemoveHubURLFromAccounts < ActiveRecord::Migration[5.2]
+  def change
+    safety_assured do
+      remove_column :accounts, :secret, :string, null: false, default: ''
+      remove_column :accounts, :remote_url, :string, null: false, default: ''
+      remove_column :accounts, :salmon_url, :string, null: false, default: ''
+      remove_column :accounts, :hub_url, :string, null: false, default: ''
+    end
+  end
+end