diff --git a/app/routers/planning_import.py b/app/routers/planning_import.py
index 7c438a2..9057827 100644
--- a/app/routers/planning_import.py
+++ b/app/routers/planning_import.py
@@ -490,13 +490,15 @@ async def import_upload(request: Request, db=Depends(get_db),
     year_match = re.search(r"(20\d{2})", fname)
     year = int(year_match.group(1)) if year_match else None
 
-    # Insert header
-    db.execute(text("""
+    # Insert header (RETURNING id : evite le bug lastval() pollué par triggers)
+    import_id = db.execute(text("""
         INSERT INTO patch_planning_imports (filename, year, sheet_count, row_count, uploaded_by, note)
         VALUES (:fn, :y, 0, 0, :uid, :nt)
-    """), {"fn": fname, "y": year, "uid": user.get("uid"), "nt": note or None})
+        RETURNING id
+    """), {"fn": fname, "y": year, "uid": user.get("uid"), "nt": note or None}).scalar()
     db.commit()
-    import_id = db.execute(text("SELECT lastval()")).scalar()
+    if not import_id:
+        return RedirectResponse(url="/patching/import?err=insert_header", status_code=303)
 
     sheet_count = 0
     row_count = 0