change adoption to separate step

tests/test_app.py

@@ -37,12 +37,13 @@ def test_status_endpoint(client: TestClient) -> None:
 
 
 def test_app_start_fails_when_app_db_missing(tmp_path, monkeypatch: pytest.MonkeyPatch) -> None:
+    missing_app_path = tmp_path / "missing_app.db"
     poo_database_path = tmp_path / "poo_ready.db"
     location_database_path = tmp_path / "location_ready.db"
     command.upgrade(_make_poo_alembic_config(f"sqlite:///{poo_database_path}"), "head")
     command.upgrade(_make_alembic_config(f"sqlite:///{location_database_path}"), "head")
 
-    monkeypatch.setenv("APP_DATABASE_URL", f"sqlite:///{tmp_path / 'missing_app.db'}")
+    monkeypatch.setenv("APP_DATABASE_URL", f"sqlite:///{missing_app_path}")
     monkeypatch.setenv("AUTH_BOOTSTRAP_USERNAME", "admin")
     monkeypatch.setenv("AUTH_BOOTSTRAP_PASSWORD", "test-password")
     monkeypatch.setenv("LOCATION_DATABASE_URL", f"sqlite:///{location_database_path}")
@@ -54,6 +55,8 @@ def test_app_start_fails_when_app_db_missing(tmp_path, monkeypatch: pytest.Monke
     with pytest.raises(RuntimeError, match="Run 'python scripts/app_db_adopt.py' first"):
         anyio.run(_run_lifespan, app)
 
+    assert not missing_app_path.exists()
+
     get_settings.cache_clear()
     reset_auth_db_caches()