diff --git a/docker/renumber-rooms.php b/docker/renumber-rooms.php
new file mode 100644
index 000000000..012a1612a
--- /dev/null
+++ b/docker/renumber-rooms.php
@@ -0,0 +1,55 @@
+<?php
+/**
+ * Renumber hotel rooms so that room numbers equal CASPOS table numbers.
+ *   docker compose ... exec -u www-data app php docker/renumber-rooms.php 101          (dry run)
+ *   docker compose ... exec -u www-data app php docker/renumber-rooms.php 101 --apply
+ * Rooms are numbered consecutively from START in the order room type, old number.
+ * Existing bookings keep their room but get the new number (room_num is copied into
+ * htl_booking_detail and used by casposbridge as table name).
+ */
+if (PHP_SAPI !== 'cli') {
+    exit;
+}
+define('_PS_ADMIN_DIR_', __DIR__);
+require __DIR__.'/../config/config.inc.php';
+
+$start = isset($argv[1]) ? (int)$argv[1] : 0;
+$apply = in_array('--apply', $argv, true);
+if ($start <= 0) {
+    fwrite(STDERR, "Usage: php docker/renumber-rooms.php <first table number> [--apply]\n");
+    exit(1);
+}
+$db = Db::getInstance();
+$rooms = $db->executeS('SELECT ri.`id`, ri.`room_num`, ri.`id_product`, pl.`name`
+    FROM `'._DB_PREFIX_.'htl_room_information` ri
+    LEFT JOIN `'._DB_PREFIX_.'product_lang` pl ON pl.`id_product` = ri.`id_product` AND pl.`id_lang` = '.(int)Configuration::get('PS_LANG_DEFAULT').'
+    ORDER BY ri.`id_hotel`, ri.`id_product`, ri.`room_num`, ri.`id`');
+
+$tables = array();
+foreach ($db->executeS('SHOW TABLES') as $t) {
+    $tables[] = reset($t);
+}
+$withRoomNum = array();
+foreach (array('htl_booking_detail', 'htl_cart_booking_data') as $t) {
+    if (in_array(_DB_PREFIX_.$t, $tables, true) && $db->executeS('SHOW COLUMNS FROM `'._DB_PREFIX_.$t.'` LIKE \'room_num\'')) {
+        $withRoomNum[] = $t;
+    }
+}
+
+$n = $start;
+foreach ($rooms as $r) {
+    $new = (string)$n++;
+    printf("%-28s %-8s -> %s\n", $r['name'], $r['room_num'], $new);
+    if ($apply && $r['room_num'] !== $new) {
+        $db->update('htl_room_information', array('room_num' => pSQL($new), 'date_upd' => date('Y-m-d H:i:s')), '`id` = '.(int)$r['id']);
+        foreach ($withRoomNum as $t) {
+            $db->update($t, array('room_num' => pSQL($new)), '`id_room` = '.(int)$r['id']);
+        }
+        if (in_array(_DB_PREFIX_.'casposbridge_job', $tables, true)) {
+            // queued (not yet posted) nights follow the new table name
+            $db->execute('UPDATE `'._DB_PREFIX_.'casposbridge_job` j JOIN `'._DB_PREFIX_.'htl_booking_detail` bd ON bd.`id` = j.`id_htl_booking`
+                SET j.`table_name` = \''.pSQL($new).'\' WHERE bd.`id_room` = '.(int)$r['id'].' AND j.`status` IN (\'pending\', \'failed\')');
+        }
+    }
+}
+echo $apply ? "Umbenannt.\n" : "Probelauf – mit --apply übernehmen.\n";
diff --git a/modules/casposbridge/README.md b/modules/casposbridge/README.md
index 000621e94..617db3f40 100644
--- a/modules/casposbridge/README.md
+++ b/modules/casposbridge/README.md
@@ -29,7 +29,12 @@ Check-out ──> Gast zahlt an der Kasse wie gewohnt
 
 1. In CASPOS: Zimmer als Tische im eigenen Tischbereich anlegen (Name = Zimmernummer), Artikel für
    Übernachtung/Frühstück/Kurtaxe anlegen, einen Kellner „Hotel“ mit Passwort anlegen, OrderApp-API aktivieren.
-2. In QloApps: Zimmernummern (Hotel Reservation System → Zimmertypen → Zimmer) auf die Tischnamen setzen.
+2. In QloApps: Zimmernummern (Hotel Reservation System → Zimmertypen → Zimmer) auf die Tischnummern setzen –
+   oder alle Zimmer fortlaufend umnummerieren (erst Probelauf, dann `--apply`; bestehende Buchungen werden mitgezogen):
+
+   ```bash
+   docker compose -f docker-compose.yml -f docker-compose.server.yml exec -u www-data app php docker/renumber-rooms.php 101
+   ```
 3. *Module → CASPOS Kassenanbindung → Konfigurieren*: IP und API-Port der Kasse (wie in der OrderApp),
    bei HTTPS den SHA1-Fingerabdruck, Kellner-Nummer und Passwort.
 4. **Verbindung testen** – zeigt Tischbereiche und Artikel mit IDs. Meldet die Kasse „Gerät nicht