Repair 2

config/base_db.php

@@ -3,12 +3,22 @@ declare(strict_types=1);
 
 /**
  * Base database for Nexus core (users, settings, modules).
- * Sync copies the correct file into /config.
+ * Prefer the deployed root config, but fall back to checked-in env defaults.
  */
 
-$path = __DIR__ . '/db_settings_basic.php';
-if (!file_exists($path)) {
-    throw new RuntimeException('Missing base DB config: expected config/db_settings_basic.php');
+$candidates = [
+    __DIR__ . '/db_settings_basic.php',
+    __DIR__ . '/staging/db_settings_basic.php',
+    __DIR__ . '/prod/db_settings_basic.php',
+];
+
+foreach ($candidates as $path) {
+    if (is_file($path)) {
+        return require $path;
+    }
 }
 
-return require $path;
+throw new RuntimeException(
+    'Missing base DB config. Expected one of: '
+    . implode(', ', array_map(static fn (string $path): string => basename(dirname($path)) . '/' . basename($path), $candidates))
+);