Split DB Updates into seperate files, with the cutoff being 2.0.0

admin/database_updates/2.3.9.php

@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * ITFlow - Database update to version 2.3.9 (from 2.3.8)
+ * Included by admin/database_updates.php - do not access directly
+ */
+
+defined('FROM_DB_UPDATER') || die("Direct file access is not allowed");
+
+     mysqli_query($mysqli, "
+        CREATE TABLE `task_approvals` (
+          `approval_id` int(11) NOT NULL AUTO_INCREMENT,
+          `approval_scope` enum('client','internal') NOT NULL,
+          `approval_type` enum('any','technical','billing','specific') NOT NULL,
+          `approval_required_user_id` int(11) DEFAULT NULL,
+          `approval_status` enum('pending','approved','declined') NOT NULL,
+          `approval_created_by` int(11) NOT NULL,
+          `approval_approved_by` varchar(255) DEFAULT NULL,
+          `approval_url_key` varchar(200) NOT NULL,
+          `approval_task_id` int(11) NOT NULL,
+          PRIMARY KEY (`approval_id`)
+        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+    ");