diff --git a/db/config.php b/db/config.php
index b08da11..768eb51 100644
--- a/db/config.php
+++ b/db/config.php
@@ -1,17 +1,29 @@
 <?php
-// Generated by setup_mariadb_project.sh — edit as needed.
-define('DB_HOST', '127.0.0.1');
-define('DB_NAME', 'app_39038');
-define('DB_USER', 'app_39038');
-define('DB_PASS', 'a977aba0-df4f-448b-91d3-b1efdb7d9c61');
+// Generated by install.php (or setup)
 
-function db() {
-  static $pdo;
-  if (!$pdo) {
-    $pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4', DB_USER, DB_PASS, [
-      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
-      PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
-    ]);
-  }
-  return $pdo;
+if (!defined('DB_HOST')) {
+    define('DB_HOST', '127.0.0.1');
 }
+if (!defined('DB_NAME')) {
+    define('DB_NAME', 'app_39038');
+}
+if (!defined('DB_USER')) {
+    define('DB_USER', 'app_39038');
+}
+if (!defined('DB_PASS')) {
+    define('DB_PASS', 'a977aba0-df4f-448b-91d3-b1efdb7d9c61');
+}
+
+if (!function_exists('db')) {
+    function db() {
+        static $pdo;
+        if (!$pdo) {
+            $dsn = 'mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4';
+            $pdo = new PDO($dsn, DB_USER, DB_PASS, [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+            ]);
+        }
+        return $pdo;
+    }
+}
\ No newline at end of file
diff --git a/install.php b/install.php
index 711fefb..f1b0b27 100644
--- a/install.php
+++ b/install.php
@@ -14,25 +14,29 @@ $messageType = '';
 function write_db_config($host, $name, $user, $pass) {
     $content = "<?php\n";
     $content .= "// Generated by install.php\n";
-    $content .= "define('DB_HOST', '" . addslashes($host) . "');\n";
-    $content .= "define('DB_NAME', '" . addslashes($name) . "');\n";
-    $content .= "define('DB_USER', '" . addslashes($user) . "');\n";
-    $content .= "define('DB_PASS', '" . addslashes($pass) . "');\n\n";
-    $content .= "function db() {\n";
-    $content .= "  static $pdo;
+    $content .= "if (!defined('DB_HOST')) define('DB_HOST', '" . addslashes($host) . "');\n";
+    $content .= "if (!defined('DB_NAME')) define('DB_NAME', '" . addslashes($name) . "');\n";
+    $content .= "if (!defined('DB_USER')) define('DB_USER', '" . addslashes($user) . "');\n";
+    $content .= "if (!defined('DB_PASS')) define('DB_PASS', '" . addslashes($pass) . "');\n\n";
+    
+    $content .= "if (!function_exists('db')) {\n";
+    $content .= "  function db() {\n";
+    $content .= "    static $pdo;
 ";
-    $content .= "  if (! $pdo) {\n";
-    $content .= "    $pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4', DB_USER, DB_PASS, [
+    $content .= "    if (! $pdo) {\n";
+    $content .= "      $pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4', DB_USER, DB_PASS, [
 ";
-    $content .= "      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+    $content .= "        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
 ";
-    $content .= "      PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    $content .= "        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
 ";
-    $content .= "    ]);
+    $content .= "      ]);
+";
+    $content .= "    }
+";
+    $content .= "    return $pdo;
 ";
     $content .= "  }
-";
-    $content .= "  return $pdo;
 ";
     $content .= "}
 ";
@@ -257,4 +261,4 @@ if (file_exists(__DIR__ . '/db/config.php')) {
 </div>
 
 </body>
-</html>
\ No newline at end of file
+</html>