diff --git a/zammad-duplicates-cleanup b/zammad-duplicates-cleanup
new file mode 100755
index 0000000..89d0888
--- /dev/null
+++ b/zammad-duplicates-cleanup
@@ -0,0 +1,110 @@
+#!/usr/bin/env python
+
+import base64
+import json
+import os
+import pickle
+import sys
+import html2text
+import traceback
+import time
+
+from zammad_py import ZammadAPI
+from zammad_py.api import Resource, TagList, TicketArticle
+
+TEMPLATE = """{
+"zammad_url": "",
+"zammad_user": "",
+"zammad_password": "",
+"rt_url": "",
+"rt_user": "",
+"rt_pass": "",
+"rt_start": 1,
+"rt_end": 1000,
+}
+"""
+
+COMMENT_TEMPLATE = """
+Ticket imported from Request Tracker (RT-#{numerical_id})
+
+URL: https://support.ungleich.ch/Ticket/Display.html?id={numerical_id}
+Created: {Created}
+Resolved: {Resolved}
+"""
+
+STATUSMAP = {"new": 1, "open": 2, "resolved": 4, "rejected": 4, "deleted": 4}
+USERMAP = {}
+
+ZAMMAD_SESSIONS = {}
+
+### helpers ###
+
+def get_zammad_session(impersonated_user=None):
+    if impersonated_user in ZAMMAD_SESSIONS:
+        return ZAMMAD_SESSIONS[impersonated_user]
+    else:
+        kwargs = {}
+        if impersonated_user:
+            kwargs["on_behalf_of"] = impersonated_user
+        session = ZammadAPI(
+            url=config["zammad_host"],
+            username=config["zammad_user"],
+            password=config["zammad_password"],
+            **kwargs,
+        )
+        ZAMMAD_SESSIONS[impersonated_user or config["zammad_user"]] = session
+
+        return session
+
+def remove_duplicates_for(rt_id, zammad, retries=0):
+    try:
+        matching_zammad_tickets= zammad.ticket.search(f"title: \"\[RT-{rt_id}\]*\"")
+        matching_zammad_ids = []
+        if len(matching_zammad_tickets) >= 2:
+            print(f"Found duplicates:")
+            for zt in matching_zammad_tickets:
+                print(f"{zt["id"]} {zt["title"]}")
+                matching_zammad_ids.append(zt["id"])
+
+        if len(matching_zammad_ids) >= 2:
+            matching_zammad_ids.sort()
+            matching_zammad_ids.pop()
+            for zt_id in matching_zammad_ids:
+                print(f"Deleting Zammad ticket {zt_id}")
+                zammad.ticket.destroy(zt_id)
+
+    except:
+        print(f"Failed to process RT-{rt_id} .. ({retries} retries left)")
+        if retries > 0:
+            print("Sleeping 5 seconds to give Zammad some air...")
+            time.sleep(5)
+            remove_duplicates_for(id, retries - 1)
+        else:
+             traceback.print_exc()
+             raise RuntimeError
+
+### main logic ###
+
+if not os.path.exists("rt2zammad.json"):
+    print("Missing rt2zammad.json!")
+    print("Create one based on following template:")
+    print(TEMPLATE)
+    sys.exit(1)
+
+with open("rt2zammad.json") as handle:
+    config = json.load(handle)
+
+h2t = html2text.HTML2Text()
+zammad = get_zammad_session()
+
+os.makedirs("tickets", exist_ok=True)
+
+
+ticket_ids = os.listdir("tickets/")
+print(f"Found {len(ticket_ids)} tickets on filesystem.")
+ticket_ids = list(map(int, ticket_ids))
+ticket_ids.sort()
+
+for id in ticket_ids:
+    print(f"Processing RT-{id}...")
+    remove_duplicates_for(id, zammad)