Load pending state attributes and event data ids at startup (#88444)

* Load pending state attributes and event data ids at startup

Since we queue all events to be processed after startup
we can have a thundering herd of queries to prime the
LRUs of event data and state attributes ids. Since we
know we are about to process a chunk of events we can
fetch all the ids in two queries

* lru

* fix hang

* Fix recorder LRU being destroyed if event session is reopened

We would clear the LRU in _close_event_session but
it would never get replaced with an LRU again so
it would leak memory if the event session is reopened

* Fix recorder LRU being destroyed if event session is reopened

We would clear the LRU in _close_event_session but
it would never get replaced with an LRU again so
it would leak memory if the event session is reopened

* cleanup

homeassistant/components/recorder/util.py

@@ -1,10 +1,12 @@
 """SQLAlchemy util functions."""
 from __future__ import annotations
 
-from collections.abc import Callable, Generator, Sequence
+from collections.abc import Callable, Generator, Iterable, Sequence
 from contextlib import contextmanager
 from datetime import date, datetime, timedelta
 import functools
+from functools import partial
+from itertools import islice
 import logging
 import os
 import time
@@ -761,3 +763,19 @@ def resolve_period(
             end_time += offset
 
     return (start_time, end_time)
+
+
+def take(take_num: int, iterable: Iterable) -> list[Any]:
+    """Return first n items of the iterable as a list.
+
+    From itertools recipes
+    """
+    return list(islice(iterable, take_num))
+
+
+def chunked(iterable: Iterable, chunked_num: int) -> Iterable[Any]:
+    """Break *iterable* into lists of length *n*.
+
+    From more-itertools
+    """
+    return iter(partial(take, chunked_num, iter(iterable)), [])