diff --git a/trainvel/gtfs/management/commands/update_trainvel_gtfs.py b/trainvel/gtfs/management/commands/update_trainvel_gtfs.py
index 880e8ff..bbb0cdb 100644
--- a/trainvel/gtfs/management/commands/update_trainvel_gtfs.py
+++ b/trainvel/gtfs/management/commands/update_trainvel_gtfs.py
@@ -19,7 +19,7 @@ class Command(BaseCommand):
 
     def add_arguments(self, parser):
         parser.add_argument('--debug', '-d', action='store_true', help="Activate debug mode")
-        parser.add_argument('--bulk_size', '-b', type=int, default=10000, help="Number of objects to create in bulk.")
+        parser.add_argument('--bulk_size', '-b', type=int, default=2000, help="Number of objects to create in bulk.")
         parser.add_argument('--dry-run', action='store_true',
                             help="Do not update the database, only print what would be done.")
         parser.add_argument('--force', '-f', action='store_true', help="Force the update of the database.")
@@ -343,8 +343,7 @@ class Command(BaseCommand):
             #     pickup_type = PickupType.NONE
 
             st = StopTime(
-                id=f"{gtfs_code}-{stop_time_dict['trip_id']}-{stop_time_dict['stop_id']}"
-                   f"-{stop_time_dict['departure_time']}",
+                id=f"{gtfs_code}-{stop_time_dict['trip_id']}-{stop_time_dict['stop_sequence']}",
                 trip_id=trip_id,
                 arrival_time=timedelta(seconds=arr_time),
                 departure_time=timedelta(seconds=dep_time),
diff --git a/trainvel/gtfs/management/commands/update_trainvel_gtfs_rt.py b/trainvel/gtfs/management/commands/update_trainvel_gtfs_rt.py
index a50d9ce..7a997fd 100644
--- a/trainvel/gtfs/management/commands/update_trainvel_gtfs_rt.py
+++ b/trainvel/gtfs/management/commands/update_trainvel_gtfs_rt.py
@@ -191,7 +191,7 @@ class Command(BaseCommand):
                 and stop_sequence < len(trip_update.stop_time_update) - 1 else PickupType.NONE
 
             StopTime.objects.update_or_create(
-                id=f"{trip_id}-{stop_time_update.stop_id}",
+                id=f"{gtfs_code}-{trip_id}-{stop_time_update.stop_sequence}",
                 trip_id=trip_id,
                 defaults={
                     "stop_id": stop_id,