refactor: change log level and add exceptions

src/Exception/UnsupportedDsnSchemeException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Exception;
+
+class UnsupportedDsnSchemeException extends \Exception
+{
+    public static function fromScheme(string $scheme): UnsupportedDsnSchemeException
+    {
+        return new UnsupportedDsnSchemeException("The DSN scheme ($scheme) is not supported");
+    }
+}