Add configurable subjects to question sets

administrator/components/com_testquestions/sql/updates/mysql/1.9.0.sql

@@ -1,5 +1,6 @@
 CREATE TABLE IF NOT EXISTS `#__testquestions_sets` (
   `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `subject_id` int unsigned NOT NULL DEFAULT 0,
   `title` varchar(255) NOT NULL,
   `description` text NULL,
   `published` tinyint NOT NULL DEFAULT 1,
@@ -13,6 +14,15 @@ CREATE TABLE IF NOT EXISTS `#__testquestions_sets` (
   KEY `idx_ordering` (`ordering`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 DEFAULT COLLATE=utf8mb4_unicode_ci;
 
+CREATE TABLE IF NOT EXISTS `#__testquestions_subjects` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `title` varchar(150) NOT NULL,
+  `published` tinyint NOT NULL DEFAULT 1,
+  `ordering` int NOT NULL DEFAULT 0,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `idx_title` (`title`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 DEFAULT COLLATE=utf8mb4_unicode_ci;
+
 CREATE TABLE IF NOT EXISTS `#__testquestions_set_questions` (
   `set_id` int unsigned NOT NULL,
   `question_id` int unsigned NOT NULL,