ChatGPT's update to harden software and run db updates.

classes/BackupValidation.php

@@ -0,0 +1,14 @@
+<?php
+final class BackupValidation {
+    /** mariadb-dump writes the completion comment at the end; never load the dump. */
+    public static function complete(string $path): bool {
+        clearstatcache(true,$path);
+        if(!is_file($path)||filesize($path)<100)return false;
+        $stream=fopen($path,'rb');if(!$stream)return false;
+        try{
+            if(fseek($stream,max(0,filesize($path)-8192),SEEK_SET)!==0)return false;
+            $tail=fread($stream,8192);
+            return $tail!==false&&preg_match('/(?:\A|\r?\n)-- Dump completed on [^\r\n]+(?:\r?\n)*\z/',$tail)===1;
+        }finally{fclose($stream);}
+    }
+}