fix(psqlpy): restore json_passthrough=True for native JSONB binding

Psqlpy's native bindings require Python dicts for JSONB columns.
Without json_passthrough=True, the queue backend serializes dicts
to JSON strings, causing "PyJSON must be dict or list value" errors.

Author: cofin

sqlspec/adapters/psqlpy/config.py

@@ -275,4 +275,4 @@ def get_signature_namespace(self) -> "dict[str, Any]":
     def get_event_runtime_hints(self) -> "EventRuntimeHints":
         """Return LISTEN/NOTIFY defaults for Psqlpy adapters."""
 
-        return EventRuntimeHints(poll_interval=0.5, select_for_update=True, skip_locked=True)
+        return EventRuntimeHints(poll_interval=0.5, select_for_update=True, skip_locked=True, json_passthrough=True)

tests/unit/test_extensions/test_events/test_backend_factories.py

@@ -139,11 +139,11 @@ def test_psqlpy_factory_hybrid_backend() -> None:
     assert backend.backend_name == "listen_notify_durable"
 
 
-def test_psqlpy_factory_json_passthrough_not_set_by_default() -> None:
-    """Psqlpy hybrid backend does not enable json_passthrough by default.
+def test_psqlpy_factory_json_passthrough_enabled_by_default() -> None:
+    """Psqlpy hybrid backend enables json_passthrough by default.
 
-    This ensures consistency with other PostgreSQL adapters (asyncpg, psycopg)
-    which also don't enable json_passthrough by default.
+    Psqlpy's native bindings expect Python dicts for JSONB columns,
+    so json_passthrough must be enabled to avoid serializing to strings.
     """
     pytest.importorskip("psqlpy")
     from sqlspec.adapters.psqlpy.config import PsqlpyConfig
@@ -153,7 +153,7 @@ def test_psqlpy_factory_json_passthrough_not_set_by_default() -> None:
     backend = create_event_backend(config, "listen_notify_durable", {})
     assert backend is not None
     queue = backend._queue._queue  # type: ignore[union-attr]
-    assert queue._json_passthrough is False
+    assert queue._json_passthrough is True
 
 
 def test_psqlpy_factory_json_passthrough_explicit() -> None: