Fix: Convert 03PovertyMapping from submodule to regular folder

03PovertyMapping/config/database.php

@@ -0,0 +1,32 @@
+<?php
+// ============================================================
+// config/database.php  — PDO singleton
+// ============================================================
+declare(strict_types=1);
+
+require_once __DIR__ . '/config.php';
+
+class Database
+{
+    private static ?PDO $instance = null;
+
+    public static function get(): PDO
+    {
+        if (self::$instance === null) {
+            $dsn = sprintf(
+                'mysql:host=%s;port=%s;dbname=%s;charset=%s',
+                DB_HOST, DB_PORT, DB_NAME, DB_CHARSET
+            );
+            self::$instance = new PDO($dsn, DB_USER, DB_PASS, [
+                PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+                PDO::ATTR_EMULATE_PREPARES   => false,
+            ]);
+        }
+        return self::$instance;
+    }
+
+    /** Prevent cloning / serialisation */
+    private function __clone() {}
+    public function __wakeup(): never { throw new \Exception('Cannot unserialize singleton.'); }
+}