Magento addAttribute duplicate after delete of core_resource entry
===

if i delete core_resource.code='my_setup_module' and rerun magento, everything in my sql/ files duplicates.  is there a way to prevent this? (that's it.  the rest of this is buffer material so stackoverflow let's me submit.)

example sql file

    $installer->addAttribute('catalog_product', 'googlemerchant_category', array(
        'label'         => 'Google Merchant category',
        'type'          => 'varchar',
        'input'         => 'multiselect',
        'backend'       => 'eav/entity_attribute_backend_array',
        'global'        => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
        'group'         => 'Google Merchant',
        'visible'       => 1,
        'required'      => 0,
        'position'      => 2,
        'option' =>
            array (
                'value' =>
                    array(
                        'option1' => array('Apparel & Accessories > Clothing'),
                        'option2' => array('Apparel & Accessories > Clothing > Activewear > Sweatshirts'),
                        'option3' => array('Apparel & Accessories > Clothing > Underwear & Socks > Socks'),
                        'option4' => array('Apparel & Accessories > Clothing Accessories'),
                        'option5' => array('Apparel & Accessories > Shoes'),
                        'option6' => array('Apparel & Accessories > Shoes > Athletic Shoes'),
                        'option7' => array('Apparel & Accessories > Shoes > Sneakers'),
                        'option8' => array('Apparel & Accessories > Clothing > Hats'),
                        'option9' => array('Apparel & Accessories > Clothing > Shorts'),
                        'option10' => array('Apparel & Accessories > Handbags'),
                        'option11' => array('Food, Beverages & Tobacco > Food Items'),
                        'option12' => array('Hardware > Flooring'),
                        'option13' => array('Health & Beauty > Health Care > Physical Therapy Equipment'),
                        'option14' => array('Media'),
                        'option15' => array('Media > Books'),
                        'option16' => array('Media > Books > Non-Fiction'),
                        'option17' => array('Media > Books > Non-Fiction > Body, Mind & Spirit Books'),
                        'option18' => array('Media > Books > Non-Fiction > Health & Fitness Books'),
                        'option19' => array('Media > DVDs & Videos'),
                        'option20' => array('Sporting Goods > Exercise & Fitness'),
                        'option21' => array('Sporting Goods > Exercise & Fitness > Abdominal Equipment'),
                        'option22' => array('Sporting Goods > Exercise & Fitness > Exercise Balls'),
                        'option23' => array('Sporting Goods > Exercise & Fitness > Exercise Bands'),
                        'option24' => array('Sporting Goods > Exercise & Fitness > Foam Rollers'),
                        'option25' => array('Sporting Goods > Exercise & Fitness > Free Weight Bars'),
                        'option26' => array('Sporting Goods > Exercise & Fitness > Gym Mats'),
                        'option27' => array('Sporting Goods > Exercise & Fitness > Jump Ropes'),
                        'option28' => array('Sporting Goods > Exercise & Fitness > Medicine Balls'),
                        'option29' => array('Sporting Goods > Exercise & Fitness > Stopwatches'),
                        'option30' => array('Sporting Goods > Exercise & Fitness > Weight Benches'),
                        'option31' => array('Sporting Goods > Exercise & Fitness > Weightlifting Belts'),
                        'option32' => array('Sporting Goods > Exercise & Fitness > Weightlifting Gloves'),
                        'option33' => array('Sporting Goods > Exercise & Fitness > Weightlifting Machine Accessories'),
                        'option34' => array('Sporting Goods > Gymnastics > Gymnastics Bars'),
                        'option35' => array('Sporting Goods > Gymnastics > Gymnastics Mats'),
                        'option36' => array('Sporting Goods > Gymnastics > Gymnastics Rings'),
                        'option37' => array('Sporting Goods > Jumping')
                    )
            )
    ));