Rewrote audit log to be OOP.

database/2020_05_21_145756_audit_log_table_fixes.php

@@ -0,0 +1,21 @@
+<?php
+namespace Misuzu\DatabaseMigrations\AuditLogTableFixes;
+
+use PDO;
+
+function migrate_up(PDO $conn): void {
+    $conn->exec('
+        ALTER TABLE `msz_audit_log`
+            DROP COLUMN `log_id`,
+            ADD INDEX `audit_log_created_index` (`log_created`);
+    ');
+}
+
+function migrate_down(PDO $conn): void {
+    $conn->exec("
+        ALTER TABLE `msz_audit_log`
+            ADD COLUMN `log_id` INT UNSIGNED NOT NULL AUTO_INCREMENT FIRST,
+            DROP INDEX `audit_log_created_index`,
+            ADD PRIMARY KEY (`log_id`);
+    ");
+}