refactor(dwh): adapt direct and REST transports

harness/tests/test_dwh_adapters.py

@@ -0,0 +1,42 @@
+import pytest
+
+from tht.config import DatabaseConfig, RestConfig
+from tht.execute import ExecutionError
+from tht.ports import DwhAdapter
+
+
+def postgres_factory():
+    from tht.adapters.dwh import PostgresDwhAdapter
+
+    return PostgresDwhAdapter(
+        DatabaseConfig(database="analytics", schema="dw", user="reader", password="secret")
+    )
+
+
+def rest_factory():
+    from tht.adapters.dwh import ThothRestDwhAdapter
+
+    database = DatabaseConfig(
+        database="analytics",
+        schema="dw",
+        user="unused",
+        password="unused",
+        transport="rest",
+    )
+    return ThothRestDwhAdapter(
+        database,
+        RestConfig(base_url="https://dwh.example.test", api_key="secret"),
+    )
+
+
+@pytest.mark.parametrize("factory", [postgres_factory, rest_factory])
+def test_adapter_rejects_write_sql_without_using_transport(factory):
+    with pytest.raises(ExecutionError, match="read-only enforcement"):
+        factory().run_query("delete from fact_sales")
+
+
+@pytest.mark.parametrize("factory", [postgres_factory, rest_factory])
+def test_adapter_satisfies_dwh_protocol(factory):
+    adapter = factory()
+    assert isinstance(adapter, DwhAdapter)
+    assert adapter.capabilities.introspection is True