[scrobbles] Add backfill tags command

vrobbler/apps/scrobbles/management/commands/backfill_scrobble_tags.py

@@ -0,0 +1,44 @@
+from django.core.management.base import BaseCommand
+from scrobbles.models import Scrobble
+
+
+class Command(BaseCommand):
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "--commit",
+            action="store_true",
+            help="Actually update tags",
+        )
+
+    def handle(self, *args, **options):
+        commit = options["commit"]
+
+        task_scrobbles = Scrobble.objects.filter(media_type=Scrobble.MediaType.TASK)
+
+        updated_count = 0
+        skipped_count = 0
+
+        for scrobble in task_scrobbles:
+            logdata = scrobble.logdata
+            if not logdata or not hasattr(logdata, "labels") or not logdata.labels:
+                skipped_count += 1
+                continue
+
+            existing_tags = list(scrobble.tags.all().values_list("name", flat=True))
+            new_labels = [
+                label for label in logdata.labels if label not in existing_tags
+            ]
+
+            if new_labels:
+                updated_count += 1
+                if commit:
+                    for label in new_labels:
+                        scrobble.tags.add(label)
+                    print(f"Updated scrobble {scrobble.id} with tags: {new_labels}")
+                else:
+                    print(
+                        f"[DRY RUN] Would update scrobble {scrobble.id} with tags: {new_labels}"
+                    )
+
+        print(f"\nUpdated {updated_count} scrobbles")
+        print(f"Skipped {skipped_count} scrobbles (no labels in logdata)")