Magento Structure Updates vs. Data Updates
Around CE 1.4, Magento extended their Setup Resource Migration system with the ability to have data updates as well as structure updates. That is, a setup resource upgrade/install script named like this mysql4-install-0.7.0.php mysql4-data-upgrade-0.7.63-0.7.64.php should contain structural changes to Magento’s database tables, [...]
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