Improve ingestion concurrency safety and batch transaction robustness

tests/test_ingestion_sync.py

@@ -26,6 +26,15 @@ def test_run_full_sync_creates_domain_objects(settings):
     assert PlayerSeason.objects.count() >= 1
     assert PlayerSeasonStats.objects.count() >= 1
     assert Player.objects.filter(origin_competition__isnull=False).exists()
+    assert run.context.get("completed_steps") == [
+        "competitions",
+        "teams",
+        "seasons",
+        "players",
+        "player_stats",
+        "player_careers",
+    ]
+    assert run.context.get("source_counts", {}).get("players", 0) >= 1
 
 
 @pytest.mark.django_db
@@ -215,3 +224,24 @@ def test_balldontlie_sync_idempotency_with_stable_payload(monkeypatch):
     }
 
     assert counts_first == counts_second
+
+
+@pytest.mark.django_db
+def test_batch_transactions_preserve_prior_step_progress_on_failure(settings, monkeypatch):
+    settings.PROVIDER_DEFAULT_NAMESPACE = "mvp_demo"
+
+    def boom(*args, **kwargs):
+        raise RuntimeError("teams-sync-failed")
+
+    monkeypatch.setattr("apps.ingestion.services.sync._sync_teams", boom)
+
+    with pytest.raises(RuntimeError):
+        run_sync_job(provider_namespace="mvp_demo", job_type=IngestionRun.JobType.FULL_SYNC)
+
+    run = IngestionRun.objects.order_by("-id").first()
+    assert run is not None
+    assert run.status == IngestionRun.RunStatus.FAILED
+    assert Competition.objects.exists()
+    assert Team.objects.count() == 0
+    assert run.context.get("completed_steps") == ["competitions"]
+    assert "Unhandled ingestion error" in run.error_summary