[scrobblers] Use MediaSourceId to avoid multiple Jellyfin scrobbles

vrobbler/apps/scrobbles/migrations/0071_add_scrobble_source_id.py

@@ -0,0 +1,18 @@
+# Generated manually for deduplication fix
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("scrobbles", "0070_rename_brickset_scrobble_brick_set"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="scrobble",
+            name="source_id",
+            field=models.CharField(max_length=255, null=True, blank=True),
+        ),
+    ]