Hi,
BePro Listings uses the WordPress api where possible. The plugin does not store user_id’s because wordpress does. So attributing a post to a particular user, is as complicated or as simple as doing so with a post or page. If you are looking at tables, then look at the wp post table
In general, if someone creates a post from their profile or the front end form, they can own that listing. In the case of their profile, they are logged in, so ownership is automatic. In the case of the front end form, there is the registration option allowing users to create an account, at the same time making them the owner.
With that said, we will probably release this as a feature for the “BePro Listings Authors” addon within the next few days. It should be easy to make this change from the admin.
Regards
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BePro Software Team