feat(backend): Add import-character-codes command

backend/dpt_app/trails/management/commands/import-character-codes.py

@@ -0,0 +1,48 @@
+import argparse
+import csv
+from django.core.management.base import BaseCommand, CommandError, CommandParser
+from typing import Any, Optional
+
+from trails.enums import ActionType
+from trails.models import Character
+from trails.qr_models import Code, Action
+
+
+class Command(BaseCommand):
+    def add_arguments(self, parser: CommandParser) -> None:
+        parser.add_argument('csv', help='The CSV file',
+                            type=argparse.FileType('r'))
+
+    def handle(self, *args: Any, **options: Any) -> Optional[str]:
+        data = csv.reader(options['csv'])
+
+        # first row is the header
+        header = next(data)
+
+        if header != ['uuid', 'one_shot', 'name', 'character']:
+            raise CommandError('Header is not correct')
+
+        for row in data:
+            # convert rows lists to dicts
+            row = dict(zip(header, row))
+
+            code, created = Code.objects.update_or_create(
+                uuid=row['uuid'],
+                defaults={
+                    'uuid': row['uuid'],
+                    'one_shot': row['one_shot'] == '1',
+                    'name': row['name']
+                }
+            )
+
+            character, created = Character.objects.update_or_create(
+                character_class=row['character']
+            )
+
+            Action.objects.update_or_create(
+                code=code,
+                defaults={
+                    'action_type': ActionType.CHARACTER,
+                    'character': character
+                }
+            )