Where is an order’s currency stored on the database

I have been using your plugin for several months. Early on, I noted that the plugin would create metadata in wp_woocommerce_order_itemmeta with meta keys such as “_woocs_order_rate” and “_woocs_order_base_currency”. I also noted that you were creating records based on the order_id rather than the order_item_id.

More recently, I cannot find any of this currency metadata when I run test orders. Please note that I have changed my database prefix away from the standard wp_.

The reason I am interested in this is because of keeping my accounts.