Teach sqlite3 about HAFakeDatetime (#78756)

tests/conftest.py

@@ -7,6 +7,7 @@ from contextlib import asynccontextmanager
 import functools
 from json import JSONDecoder, loads
 import logging
+import sqlite3
 import ssl
 import threading
 from typing import Any
@@ -104,6 +105,11 @@ def pytest_runtest_setup():
     freezegun.api.datetime_to_fakedatetime = ha_datetime_to_fakedatetime
     freezegun.api.FakeDatetime = HAFakeDatetime
 
+    def adapt_datetime(val):
+        return val.isoformat(" ")
+
+    sqlite3.register_adapter(HAFakeDatetime, adapt_datetime)
+
 
 def ha_datetime_to_fakedatetime(datetime):
     """Convert datetime to FakeDatetime.