Extracting an archive into a directory that contains a symlink with the same name as a file in the archive will overwrite the symlink target, if the user extracting the archive has permissions to it. The current scheme is vulnerable to an attacker setting up a symlink in the temp directory of the production server, and when the user importing the data runs UpdateTable.php, they will overwrite a file that they have permissions to edit of the attacker's choosing.

There really isn't a good reason to use an archive here-- just upload the two files separately.

Additionally, issues like CVE-2015-3329 make me nervous to use phar in production without a really good reason.