removing data on uninstall

uninstall.php

@@ -0,0 +1,37 @@
+<?php
+/**
+ * Our uninstall call.
+ *
+ * @package FAIR
+ */
+
+// Only run this on the actual WP uninstall function.
+if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
+	die;
+}
+
+// Include the avatar namespace so we can use the constant.
+require_once __DIR__ . '/inc/avatars/namespace.php';
+
+// Delete any single or multisite keys.
+delete_option( 'fair_indexnow_key' );
+delete_site_option( \FAIR\Avatars\AVATAR_SRC_SETTING_KEY );
+
+// Delete any transients we may have created or modified.
+delete_site_transient( 'update_plugins' );
+delete_site_transient( 'update_themes' );
+
+global $wpdb;
+
+// Prepare our delete query.
+$query_args = $wpdb->prepare("
+	DELETE FROM $wpdb->usermeta
+	WHERE       meta_key IN (
+		%s,
+		%s
+	)
+", 'fair_avatar_site_id', 'fair_avatar_id' );
+
+// And actually run it.
+// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- we did use the prepare function above
+$wpdb->query( $query_args );