Codeception multiple tests, 1 script

I think I might be getting the concept wrong or not thinking about something correctly. I'm looking for a way to connect to db, and then run a selenium test (in phantomjs) for every row of a table. The test is to check for broken images on a bespoke CMS, and could be applied to any CMS.

I basically want to run an acceptance test for every page (of a specific type) by loading their IDs from the db and then running a separate test for each ID.

This is what I have so far:

$I = new WebGuy($scenario);
$results = $I->getArrayFromDB('talkthrough', '`key`', array());
foreach ($results as $r) {
    $I->wantTo('Check helpfile '.$r['key'].'for broken images');
    $I->amOnPage('/talkThrough.php?id='.$r['key']);
    $I->seeAllImages();
}

This works to some extent in that it executes until the first failure (because it is running as 1 test with many assertions).

How do I make this run as individual tests?

I ended up looping through and storing the key that failed in a comma delimited string and setting a bool to say failures found.

$I = new WebGuy($scenario);
$results = $I->getArrayFromDB('talkthrough', '`key`', array());
$failures = "Broken help files are: ";
$failures_found = false;
foreach ($results as $key => $r) {
   $I->wantTo('Check helpfile '.$r['key'].'for broken images');
   $I->amOnPage('/talkThrough.php?id='.$r['key']);
   $allImagesFine = $I->checkAllImages();
   if($allImagesFine != '1')
   {
       $fail = $r['key'].",";
       $failures.= $fail;
       $failures_found = true;
   }
}
$I->seeBrokenImages($failures_found,$failures);

With following as my webhelper

<?php
namespace Codeception\Module;

// here you can define custom functions for WebGuy 

class WebHelper extends \Codeception\Module
{
    function checkAllImages()
    {
        $result = $this->getModule('Selenium2')->session->evaluateScript("return     (function(){ return Array.prototype.slice.call(document.images).every(function (img) {return img.complete && img.naturalWidth > 0;}); })()");
        return $result;
    }
    function getArrayFromDB($table, $column, $criteria = array())
    {
        $dbh = $this->getModule('Db');
        $query = $dbh->driver->select($column, $table, $criteria);
        $dbh->debugSection('Query', $query, json_encode($criteria));

        $sth = $dbh->driver->getDbh()->prepare($query);
        if (!$sth) \PHPUnit_Framework_Assert::fail("Query '$query' can't be executed.");

        $sth->execute(array_values($criteria));
        return $sth->fetchAll();
    }
    function seeBrokenImages($bool,$failArray)
    {
        $this->assertFalse($bool,$failArray);
    }
}

Thanks for the submitted answers