fix(test): correct Settings() alias usage and mypy union-attr in migration test

Adding a real Postgres service to CI (previous commit) surfaced a real bug:
test_unconfigured_dependencies_report_degraded constructed
Settings(database_url=None, qdrant_url=None, ...) using the Python attribute
names, but Settings has no populate_by_name=True and its fields are aliased
(alias="DATABASE_URL" etc.) with extra="ignore" -- so those two kwargs were
silently dropped as unrecognized extras, and the settings fell through to
the real DATABASE_URL env var instead of the intended None override. This
was invisible before because CI had no Postgres server either way, so the
env-var fallback also produced "down" by coincidence. Every other Settings(...)
construction in the test suite already uses the alias spelling
(DATABASE_URL=, JWT_SECRET=, ...); fixed this one call site to match.

Also fixed a new mypy union-attr error from the prior commit's
_exec_script helper: AsyncConnection.get_raw_connection()'s
driver_connection is typed Any | None.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: piyushmakhija28

db/tests/test_schema.py

@@ -354,7 +354,9 @@ async def test_forward_then_rollback_restores_baseline() -> None:
     async def _exec_script(conn: AsyncConnection, sql: str) -> None:
         """Run a (possibly multi-statement) SQL script via the raw driver connection."""
         raw_connection = await conn.get_raw_connection()
-        await raw_connection.driver_connection.execute(sql)
+        driver_connection = raw_connection.driver_connection
+        assert driver_connection is not None
+        await driver_connection.execute(sql)
 
     engine = create_async_engine(os.environ["DATABASE_URL"])
     try:

tests/test_health_internals.py

@@ -150,7 +150,7 @@ class TestEvaluateReadiness:
 
     async def test_unconfigured_dependencies_report_degraded(self) -> None:
         """Unconfigured DATABASE_URL/QDRANT_URL surface as degraded + down."""
-        settings = Settings(database_url=None, qdrant_url=None, JWT_ISSUER="test-issuer")
+        settings = Settings(DATABASE_URL=None, QDRANT_URL=None, JWT_ISSUER="test-issuer")
         readiness = await health.evaluate_readiness(settings)
         assert readiness.status == "degraded"
         assert readiness.dependencies == {"postgres": "down", "qdrant": "down"}