feat(fc3c): migration 0013 — download_event.metadata + import_settings downloader fields

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_migration_0013.py

@@ -0,0 +1,31 @@
+import pytest
+from sqlalchemy import inspect, select
+
+from backend.app.models import ImportSettings
+
+pytestmark = pytest.mark.integration
+
+
+@pytest.mark.asyncio
+async def test_download_event_has_metadata(db):
+    cols = await db.run_sync(
+        lambda s: {c["name"]: c for c in inspect(s.bind).get_columns("download_event")}
+    )
+    assert "metadata" in cols
+    assert cols["metadata"]["nullable"] is False
+
+
+@pytest.mark.asyncio
+async def test_import_settings_has_downloader_fields(db):
+    cols = await db.run_sync(
+        lambda s: {c["name"]: c for c in inspect(s.bind).get_columns("import_settings")}
+    )
+    assert "download_rate_limit_seconds" in cols
+    assert "download_validate_files" in cols
+
+
+@pytest.mark.asyncio
+async def test_import_settings_defaults(db):
+    row = (await db.execute(select(ImportSettings).where(ImportSettings.id == 1))).scalar_one()
+    assert row.download_rate_limit_seconds == 3.0
+    assert row.download_validate_files is True