In my setup.php I set it to allow overwriting existing installs since I am debugging but every time I load new content the database still keeps the old content. I've been testing this by running a new import, browsing, and then seeing old objects that should have been wiped. If this is relevant I have been running the imports on the UI and not the terminal for now.
if (!defined('CA_ALLOW_INSTALLER_TO_OVERWRITE_EXISTING_INSTALLS')) {
define('CA_ALLOW_INSTALLER_TO_OVERWRITE_EXISTING_INSTALLS', true);
}