diff --git a/quiztech-assessment-platform.php b/quiztech-assessment-platform.php
index bbec7f0..5802262 100644
--- a/quiztech-assessment-platform.php
+++ b/quiztech-assessment-platform.php
@@ -81,22 +81,22 @@ function activate_quiztech() {
 	$charset_collate = $wpdb->get_charset_collate();
 	$table_name = $wpdb->prefix . 'quiztech_invitations';
 
-	$sql = "CREATE TABLE $table_name (
+	$sql = "CREATE TABLE {$table_name} (
 		id mediumint(9) NOT NULL AUTO_INCREMENT,
 		token varchar(32) NOT NULL,
 		job_id bigint(20) unsigned NOT NULL,
 		assessment_id bigint(20) unsigned NOT NULL,
 		applicant_email varchar(255) NOT NULL,
-		status varchar(20) NOT NULL DEFAULT 'pending', -- e.g., pending, viewed, completed, expired
+		status varchar(20) NOT NULL DEFAULT 'pending',
 		created_timestamp datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
-		expiry_timestamp datetime DEFAULT NULL, -- Optional expiry
+		expiry_timestamp datetime DEFAULT NULL,
 		PRIMARY KEY  (id),
 		UNIQUE KEY token (token),
 		KEY job_id (job_id),
 		KEY assessment_id (assessment_id),
-		KEY applicant_email (applicant_email(191)), -- Index prefix for potential long emails
+		KEY applicant_email (applicant_email(191)),
 		KEY status (status)
-	) $charset_collate;";
+	) {$charset_collate};";
 
 	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
 	\dbDelta( $sql );