rebuild to module

config/base_db.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Base database for Nexus core (users, settings, modules).
+ * This uses the environment-specific config in /config/{env}/db_settings_basic.php.
+ */
+
+$env = getenv('APP_ENV');
+if (!$env && defined('APP_ENV')) {
+    $env = APP_ENV;
+}
+if (!$env) {
+    $env = 'prod';
+}
+
+$env = strtolower((string)$env);
+$candidates = [
+    __DIR__ . '/' . $env . '/db_settings_basic.php',
+    __DIR__ . '/staging/db_settings_basic.php',
+    __DIR__ . '/prod/db_settings_basic.php',
+];
+
+foreach ($candidates as $path) {
+    if (file_exists($path)) {
+        return require $path;
+    }
+}
+
+throw new RuntimeException('Missing base DB config: expected config/{env}/db_settings_basic.php');