feat(players): add origin competition/team model and filtering

apps/players/migrations/0004_backfill_player_origins.py

@@ -0,0 +1,35 @@
+from django.db import migrations
+from django.db.models import F, Q
+
+
+def backfill_player_origins(apps, schema_editor):
+    Player = apps.get_model("players", "Player")
+    PlayerCareerEntry = apps.get_model("players", "PlayerCareerEntry")
+
+    for player in Player.objects.all().iterator():
+        entry = (
+            PlayerCareerEntry.objects.filter(player=player)
+            .filter(Q(competition__isnull=False) | Q(team__isnull=False))
+            .order_by(
+                F("start_date").asc(nulls_last=True),
+                F("season__start_date").asc(nulls_last=True),
+                "id",
+            )
+            .first()
+        )
+        if entry is None:
+            continue
+
+        player.origin_competition_id = entry.competition_id
+        player.origin_team_id = entry.team_id
+        player.save(update_fields=["origin_competition", "origin_team"])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("players", "0003_player_origin_competition_player_origin_team_and_more"),
+    ]
+
+    operations = [
+        migrations.RunPython(backfill_player_origins, migrations.RunPython.noop),
+    ]