Reduce overhead to compile statistics (#106927)

* Reduce overhead to compile statistics

statistics uses LazyState for compatibility with State when pulling
data from the database.

After the previous round of refactoring to modern history, the setters
are never called and can be removed.

* reduce

homeassistant/components/recorder/models/state.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 
 from datetime import datetime
 import logging
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
 from sqlalchemy.engine.row import Row
 
@@ -17,10 +17,16 @@ from homeassistant.core import Context, State
 import homeassistant.util.dt as dt_util
 
 from .state_attributes import decode_attributes_from_source
-from .time import process_timestamp
+
+if TYPE_CHECKING:
+    from functools import cached_property
+else:
+    from homeassistant.backports.functools import cached_property
 
 _LOGGER = logging.getLogger(__name__)
 
+EMPTY_CONTEXT = Context(id=None)
+
 
 def extract_metadata_ids(
     entity_id_to_metadata_id: dict[str, int | None],
@@ -36,15 +42,6 @@ def extract_metadata_ids(
 class LazyState(State):
     """A lazy version of core State after schema 31."""
 
-    __slots__ = [
-        "_row",
-        "_attributes",
-        "_last_changed_ts",
-        "_last_updated_ts",
-        "_context",
-        "attr_cache",
-    ]
-
     def __init__(  # pylint: disable=super-init-not-called
         self,
         row: Row,
@@ -61,61 +58,35 @@ class LazyState(State):
         self.state = state or ""
         self._attributes: dict[str, Any] | None = None
         self._last_updated_ts: float | None = last_updated_ts or start_time_ts
-        self._last_changed_ts: float | None = None
-        self._context: Context | None = None
         self.attr_cache = attr_cache
+        self.context = EMPTY_CONTEXT
 
-    @property  # type: ignore[override]
+    @cached_property  # type: ignore[override]
     def attributes(self) -> dict[str, Any]:
         """State attributes."""
-        if self._attributes is None:
-            self._attributes = decode_attributes_from_source(
+        return decode_attributes_from_source(
             getattr(self._row, "attributes", None), self.attr_cache
         )
-        return self._attributes
 
-    @attributes.setter
-    def attributes(self, value: dict[str, Any]) -> None:
-        """Set attributes."""
-        self._attributes = value
+    @cached_property
+    def _last_changed_ts(self) -> float | None:
+        """Last changed timestamp."""
+        return getattr(self._row, "last_changed_ts", None)
 
-    @property
-    def context(self) -> Context:
-        """State context."""
-        if self._context is None:
-            self._context = Context(id=None)
-        return self._context
-
-    @context.setter
-    def context(self, value: Context) -> None:
-        """Set context."""
-        self._context = value
-
-    @property
-    def last_changed(self) -> datetime:
+    @cached_property
+    def last_changed(self) -> datetime:  # type: ignore[override]
         """Last changed datetime."""
-        if self._last_changed_ts is None:
-            self._last_changed_ts = (
-                getattr(self._row, "last_changed_ts", None) or self._last_updated_ts
+        return dt_util.utc_from_timestamp(
+            self._last_changed_ts or self._last_updated_ts
         )
-        return dt_util.utc_from_timestamp(self._last_changed_ts)
 
-    @last_changed.setter
-    def last_changed(self, value: datetime) -> None:
-        """Set last changed datetime."""
-        self._last_changed_ts = process_timestamp(value).timestamp()
-
-    @property
-    def last_updated(self) -> datetime:
+    @cached_property
+    def last_updated(self) -> datetime:  # type: ignore[override]
         """Last updated datetime."""
+        if TYPE_CHECKING:
             assert self._last_updated_ts is not None
         return dt_util.utc_from_timestamp(self._last_updated_ts)
 
-    @last_updated.setter
-    def last_updated(self, value: datetime) -> None:
-        """Set last updated datetime."""
-        self._last_updated_ts = process_timestamp(value).timestamp()
-
     def as_dict(self) -> dict[str, Any]:  # type: ignore[override]
         """Return a dict representation of the LazyState.
 

tests/components/recorder/test_models.py

@@ -352,22 +352,6 @@ async def test_lazy_state_handles_same_last_updated_and_last_changed(
         "last_updated": "2021-06-12T03:04:01.000323+00:00",
         "state": "off",
     }
-    lstate.last_updated = datetime(2020, 6, 12, 3, 4, 1, 323, tzinfo=dt_util.UTC)
-    assert lstate.as_dict() == {
-        "attributes": {"shared": True},
-        "entity_id": "sensor.valid",
-        "last_changed": "2021-06-12T03:04:01.000323+00:00",
-        "last_updated": "2020-06-12T03:04:01.000323+00:00",
-        "state": "off",
-    }
-    lstate.last_changed = datetime(2020, 6, 12, 3, 4, 1, 323, tzinfo=dt_util.UTC)
-    assert lstate.as_dict() == {
-        "attributes": {"shared": True},
-        "entity_id": "sensor.valid",
-        "last_changed": "2020-06-12T03:04:01.000323+00:00",
-        "last_updated": "2020-06-12T03:04:01.000323+00:00",
-        "state": "off",
-    }
 
 
 @pytest.mark.parametrize(