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Add primary keys to multiple tables
I missed these keys when creating the initial schema, and it's a useful practice.
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CREATE TABLE `EbookSources` (
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`EbookSourceId` int(10) unsigned NOT NULL AUTO_INCREMENT,
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`EbookId` int(10) unsigned NOT NULL,
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`Type` enum('project_gutenberg', 'project_gutenberg_australia', 'project_gutenberg_canada', 'internet_archive', 'hathi_trust', 'wikisource', 'google_books', 'faded_page', 'other') DEFAULT 'other',
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`Url` varchar(255) NOT NULL,
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PRIMARY KEY (`EbookSourceId`),
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KEY `index1` (`EbookId`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
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