Extract the storage layer into core

tests/test_materialize.py

@@ -51,7 +51,7 @@ NOW = "2026-09-14T12:00:00+00:00"
 
 
 async def _prepare(path):
-    database = NestQuestDatabase(_make_hass_mock())
+    database = NestQuestDatabase(_make_hass_mock().async_add_executor_job)
     await database.open(path)
     await apply_migrations(database)
     return database
@@ -1039,7 +1039,7 @@ def test_regenerate_for_child_uses_single_anchor_across_midnight(
         clock["reads"] += 1
         return day0 if clock["reads"] == 1 else day1
 
-    import custom_components.nestquest.dao_instances as dao_instances_module
+    import core.dao_instances as dao_instances_module
 
     monkeypatch.setattr(dao_instances_module, "_today", _fake_today)