fix: make playerseason uniqueness context-aware

app/scouting/migrations/0004_remove_playerseason_uniq_player_season_and_more.py

@@ -0,0 +1,21 @@
+# Generated by Django 5.2.2 on 2026-04-06 17:30
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('scouting', '0003_alter_player_position'),
+    ]
+
+    operations = [
+        migrations.RemoveConstraint(
+            model_name='playerseason',
+            name='uniq_player_season',
+        ),
+        migrations.AddConstraint(
+            model_name='playerseason',
+            constraint=models.UniqueConstraint(fields=('player', 'season', 'team', 'competition'), name='uniq_player_season_context', nulls_distinct=False),
+        ),
+    ]