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SET FOREIGN_KEY_CHECKS=0;
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ALTER TABLE `collections` DROP FOREIGN KEY `collections_ibfk_7`;
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ALTER TABLE `collections` ADD CONSTRAINT `collections_ibfk_7`
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FOREIGN KEY `collections_ibfk_7` (`author_id`)
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REFERENCES `users` (`id`)
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ON DELETE CASCADE;
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SET FOREIGN_KEY_CHECKS=1;
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