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Editing: uninstall-functions.php

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<?php
/**
 * Helper function for removing plugin data during uninstalling.
 *
 * @package AMP
 */

namespace AmpProject\AmpWP;

/**
 * Delete data from option table.
 *
 * @return void
 * @internal
 */
function delete_options() {
	$options = get_option( 'amp-options' );

delete_option( 'amp-options' );
	delete_option( 'amp_css_transient_monitor_time_series' );
	delete_option( 'amp_url_validation_queue' ); // See Validation\URLValidationCron::OPTION_KEY.

$theme_mod_name = 'amp_customize_setting_modified_timestamps';
	remove_theme_mod( $theme_mod_name );
	if ( ! empty( $options['reader_theme'] ) && 'legacy' !== $options['reader_theme'] ) {
		$reader_theme_mods_option_name = sprintf( 'theme_mods_%s', $options['reader_theme'] );
		$reader_theme_mods             = get_option( $reader_theme_mods_option_name );
		if ( is_array( $reader_theme_mods ) && isset( $reader_theme_mods[ $theme_mod_name ] ) ) {
			unset( $reader_theme_mods[ $theme_mod_name ] );
			update_option( $reader_theme_mods_option_name, $reader_theme_mods );
		}
	}
}

/**
 * Delete AMP user meta.
 *
 * @return void
 * @internal
 */
function delete_user_metadata() {
	$keys = [
		'amp_dev_tools_enabled',
		'amp_review_panel_dismissed_for_template_mode',
	];
	foreach ( $keys as $key ) {
		delete_metadata( 'user', 0, $key, '', true );
	}
}

/**
 * Delete AMP Validated URL posts.
 *
 * @return void
 * @internal
 */
function delete_posts() {

/** @var \wpdb */
	global $wpdb;

$post_type = 'amp_validated_url';
	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching

// Delete all post meta data related to "amp_validated_url" post_type.
	$wpdb->query(
		$wpdb->prepare(
			"
			DELETE meta
			FROM $wpdb->postmeta AS meta
				INNER JOIN $wpdb->posts AS posts
					ON posts.ID = meta.post_id
			WHERE posts.post_type = %s;
			",
			$post_type
		)
	);

// Delete all amp_validated_url posts.
	$wpdb->delete(
		$wpdb->posts,
		compact( 'post_type' )
	);

// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
}

/**
 * Delete AMP validation error terms.
 *
 * @return void
 * @internal
 */
function delete_terms() {
	/** @var \wpdb */
	global $wpdb;

$taxonomy = 'amp_validation_error';
	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching

// Delete term meta (added in WP 4.4).
	if ( ! empty( $wpdb->termmeta ) ) {
		$wpdb->query(
			$wpdb->prepare(
				"
				DELETE tm
				FROM $wpdb->termmeta AS tm
					INNER JOIN $wpdb->term_taxonomy AS tt
						ON tm.term_id = tt.term_id
				WHERE tt.taxonomy = %s;
				",
				$taxonomy
			)
		);
	}

// Delete term relationship.
	$wpdb->query(
		$wpdb->prepare(
			"
			DELETE tr
			FROM $wpdb->term_relationships AS tr
				INNER JOIN $wpdb->term_taxonomy AS tt
					ON tr.term_taxonomy_id = tt.term_taxonomy_id
			WHERE tt.taxonomy = %s;
			",
			$taxonomy
		)
	);

// Delete terms.
	$wpdb->query(
		$wpdb->prepare(
			"
			DELETE terms
			FROM $wpdb->terms AS terms
				INNER JOIN $wpdb->term_taxonomy AS tt
					ON terms.term_id = tt.term_id
			WHERE tt.taxonomy = %s;
			",
			$taxonomy
		)
	);

// Delete term taxonomy.
	$wpdb->delete(
		$wpdb->term_taxonomy,
		compact( 'taxonomy' )
	);
	// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
}

/**
 * Delete transient data from option table if object cache is not available.
 *
 * @return void
 * @internal
 */
function delete_transients() {

// Transients are not stored in the options table if an external object cache is used,
	// in which case they cannot be queried for deletion.
	if ( wp_using_ext_object_cache() ) {
		return;
	}

/** @var \wpdb */
	global $wpdb;

$transient_groups = [
		'AmpProject\AmpWP\DevTools\BlockSourcesamp_block_sources',
		'amp-parsed-stylesheet-v%',
		'amp_error_index_counts',
		'amp_img_%',
		'amp_lock_%',
		'amp_new_validation_error_urls_count',
		'amp_plugin_activation_validation_errors',
		'amp_remote_request_%',
		'amp_themes_wporg',
	];

$where_clause = [];

foreach ( $transient_groups as $transient_group ) {
		if ( false !== strpos( $transient_group, '%' ) ) {
			$where_clause[] = $wpdb->prepare(
				' option_name LIKE %s OR option_name LIKE %s ',
				"_transient_$transient_group",
				"_transient_timeout_$transient_group"
			);
		} else {
			$where_clause[] = $wpdb->prepare(
				' option_name = %s OR option_name = %s ',
				"_transient_$transient_group",
				"_transient_timeout_$transient_group"
			);
		}
	}

// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- Cannot cache result since we're deleting the records.
	$wpdb->query(
		// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- See use of prepare in foreach loop above.
		"DELETE FROM $wpdb->options WHERE " . implode( ' OR ', $where_clause )
	);
}

/**
 * Remove plugin data.
 *
 * @return void
 * @internal
 */
function remove_plugin_data() {
	$options = get_option( 'amp-options' );

if (
		is_array( $options ) && array_key_exists( 'delete_data_at_uninstall', $options )
			? $options['delete_data_at_uninstall']
			: true
	) {
		delete_options();
		delete_user_metadata();
		delete_posts();
		delete_terms();
		delete_transients();

// Clear any cached data that has been removed.
		wp_cache_flush();
	}
}

Editing: uninstall-functions.php

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