[scrobbles] Add fix playback position command

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

@@ -0,0 +1,69 @@
+from datetime import timedelta
+
+from django.core.management.base import BaseCommand
+from django.db.models import F, Q
+
+from vrobbler.apps.scrobbles.models import Scrobble
+
+
+class Command(BaseCommand):
+    help = "Recalculate playback_position_seconds for scrobbles of a given media type"
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "media_type",
+            type=str,
+            help="Media type to fix (e.g., Video, Track, VideoGame)",
+        )
+        parser.add_argument(
+            "--dry-run",
+            action="store_true",
+            help="Show what would be changed without making changes",
+        )
+
+    def handle(self, *args, **options):
+        media_type = options["media_type"]
+        dry_run = options["dry_run"]
+
+        valid_types = [choice[0] for choice in Scrobble.MediaType.choices]
+        if media_type not in valid_types:
+            self.stdout.write(
+                self.style.ERROR(
+                    f"Invalid media_type '{media_type}'. Valid types: {', '.join(valid_types)}"
+                )
+            )
+            return
+
+        scrobbles = Scrobble.objects.filter(
+            media_type=media_type,
+            timestamp__isnull=False,
+            stop_timestamp__isnull=False,
+        )
+
+        total = scrobbles.count()
+        self.stdout.write(f"Found {total} scrobbles of type '{media_type}'")
+
+        updated = 0
+        for scrobble in scrobbles.iterator():
+            calculated = int(
+                (scrobble.stop_timestamp - scrobble.timestamp).total_seconds()
+            )
+            if scrobble.playback_position_seconds != calculated:
+                self.stdout.write(
+                    f"  Scrobble {scrobble.id}: {scrobble.playback_position_seconds} -> {calculated}"
+                )
+                if not dry_run:
+                    scrobble.playback_position_seconds = calculated
+                    scrobble.save(update_fields=["playback_position_seconds"])
+                updated += 1
+
+        if dry_run:
+            self.stdout.write(
+                self.style.WARNING(
+                    f"Dry run: would update {updated} scrobbles. Use without --dry-run to apply."
+                )
+            )
+        else:
+            self.stdout.write(
+                self.style.SUCCESS(f"Updated {updated} scrobbles")
+            )