diff --git a/scripts/migration/migrate_tickets.py b/scripts/migration/migrate_tickets.py
index 276f549..d09fadb 100644
--- a/scripts/migration/migrate_tickets.py
+++ b/scripts/migration/migrate_tickets.py
@@ -10,16 +10,20 @@ Phase 6: Import tickets → ERPNext Issue + Communication.
 Direct PostgreSQL. Detached.
 Log: /tmp/migrate_tickets.log
 """
+import os
 import pymysql
 import psycopg2
 import uuid
 from datetime import datetime, timezone
 from html import unescape
 
-LEGACY = {"host": "legacy-db", "user": "facturation", "password": "***LEGACY-DB-PW-REDACTED***",
-          "database": "gestionclient", "connect_timeout": 30, "read_timeout": 600}
-PG = {"host": "db", "port": 5432, "user": "postgres", "password": "123",
-      "dbname": "_eb65bdc0c4b1b2d6"}
+# Creds via env (secret hors repo). Défauts alignés sur /opt/targo-sync (sync_services_incremental.py).
+LEGACY = {"host": os.environ.get("LEGACY_HOST", "10.100.80.100"), "user": "facturation",
+          "password": os.environ.get("LEGACY_PW", ""), "database": "gestionclient",
+          "connect_timeout": 30, "read_timeout": 600}
+PG = {"host": os.environ.get("PG_HOST", "db"), "port": 5432, "user": "postgres",
+      "password": os.environ.get("PG_PW", "123"), "dbname": os.environ.get("PG_DB", "_eb65bdc0c4b1b2d6")}
+PREVIEW = os.environ.get("PREVIEW", "0") == "1"  # compte les manquants + sort, N'ÉCRIT RIEN
 
 ADMIN = "Administrator"
 COMPANY = "TARGO"
@@ -130,6 +134,21 @@ def main():
 
     log("  {} customers mapped, {} staff→user mapped".format(len(cust_map), len(staff_to_user)))
 
+    # PREVIEW — compte les tickets manquants (pas encore en Issue), par statut, puis SORT sans écrire
+    if PREVIEW:
+        from collections import Counter
+        miss = [t for t in tickets if t["id"] not in existing_issues]
+        by_status = Counter(t.get("status", "?") for t in miss)
+        log("")
+        log("=== PREVIEW (aucune écriture) ===")
+        log("  Tickets F total       : {}".format(len(tickets)))
+        log("  Déjà en Issue (skip)  : {}".format(len(tickets) - len(miss)))
+        log("  MANQUANTS à importer  : {}  {}".format(len(miss), dict(by_status)))
+        if miss:
+            log("  plage id manquants    : {} … {}".format(min(t["id"] for t in miss), max(t["id"] for t in miss)))
+        pg.close()
+        return
+
     # 3. Create Issue Priorities
     for pname in ["Urgent", "High", "Medium", "Low"]:
         if pname not in existing_priorities: