If you look in devconnect_developer_apps.api.php you can find a list (with examples) of the Drupal hooks we expose related to developer apps. In a custom module implementing some of these hooks, you could write all this information to the database. Just be aware that if any changes are made in the Edge Management UI or (any other dev portal instance pointed to the same org), they will not be reflected in your database.
This is why we treat Edge as the point of authority rather than the database. In many cases, people have dev, test and live Drupal instances pointed at the same org, and since Edge changes can come from any of those environments, it is impossible to keep the database properly in sync.
If you are treating the database data as non-authoritative, there's no harm, though.
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