Drop old services before updating GTFS data

sncfgtfs/management/commands/update_sncf_gtfs.py

@@ -56,8 +56,6 @@ class Command(BaseCommand):
 
         self.stdout.write("Updating database...")
 
-        all_trips = []
-
         for transport_type, feed_url in self.GTFS_FEEDS.items():
             self.stdout.write(f"Downloading {transport_type} GTFS feed...")
             with ZipFile(BytesIO(requests.get(feed_url).content)) as zipfile:
@@ -161,6 +159,7 @@ class Command(BaseCommand):
                                               unique_fields=['id'])
                     routes.clear()
 
+                Calendar.objects.filter(transport_type=transport_type).delete()
                 calendar_ids = []
                 if "calendar.txt" in zipfile.namelist():
                     calendars = []
@@ -299,8 +298,6 @@ class Command(BaseCommand):
                                              unique_fields=['id'])
                     trips.clear()
 
-                all_trips.extend(trips)
-
                 stop_times = []
                 for stop_time_dict in csv.DictReader(read_file("stop_times.txt")):
                     stop_time_dict: dict