discourse/db/migrate/20180719103905_alter_indexe...

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class AlterIndexesOnEmailLogs < ActiveRecord::Migration[5.2]
def change
remove_index :email_logs,
name: "index_email_logs_on_user_id_and_created_at",
column: [:user_id, :created_at]
add_index :email_logs, :user_id
remove_index :email_logs, [:skipped, :created_at]
add_index :email_logs, [:skipped, :bounced, :created_at]
end
end