original_url = config_mod.settings.DATABASE_URL
    config_mod.settings.DATABASE_URL = TEST_DATABASE_URL

    import app.db.session as db_session_mod

    importlib.reload(db_session_mod)
    import app.main as main_mod

    importlib.reload(main_mod)

    # 3. create schema
    from app.models import Base

    eng = create_engine(TEST_DATABASE_URL, pool_pre_ping=True)
    Base.metadata.create_all(eng)
    eng.dispose()

    yield main_mod.app

    # 4. restore global modules and drop the test database
    config_mod.settings.DATABASE_URL = original_url
    importlib.reload(db_session_mod)
    admin = create_engine(POSTGRES_ADMIN_URL, pool_pre_ping=True, isolation_level="AUTOCOMMIT")
    with admin.connect() as c:
        c.execute(text(f'DROP DATABASE IF EXISTS "{TEST_DB_NAME}"'))
    admin.dispose()


# Tables to truncate between API tests (order-independent via TRUNCATE CASCADE)
_TRUNCATE = [
    "audit_logs", "email_events", "send_attempts", "send_jobs",
    "campaign_recipients", "campaigns", "recipients", "recipient_lists",
    "subject_lines", "html_templates", "attachments", "company_phone_numbers",
    "suppression_list", "oauth_tokens", "oauth_client_configs",
    "gmail_accounts", "application_settings", "users",
]


@pytest.fixture()
def api(test_app):