feat: shortened and filename-safe request ids

src/Service/RequestIdGenerator.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+class RequestIdGenerator
+{
+    private const TIMESTAMP_LENGTH = 10;
+    private const RANDOM_LENGTH = 8;
+
+    public function generateBaseId(): string
+    {
+        $timestampMs = (int) floor(microtime(true) * 1000);
+        $timestampPart = str_pad(base_convert((string) $timestampMs, 10, 36), self::TIMESTAMP_LENGTH, '0', STR_PAD_LEFT);
+
+        $maxRandomValue = (36 ** self::RANDOM_LENGTH) - 1;
+        $randomPart = str_pad(base_convert((string) random_int(0, $maxRandomValue), 10, 36), self::RANDOM_LENGTH, '0', STR_PAD_LEFT);
+
+        return sprintf('r-%s-%s', $timestampPart, $randomPart);
+    }
+}