Fix recorder run history during schema migration and startup

homeassistant/components/recorder/run_history.py

@@ -64,8 +64,13 @@ def first(self) -> RecorderRuns:
     @property
     def current(self) -> RecorderRuns:
         """Get the current run."""
-        assert self._current_run_info is not None
-        return self._current_run_info
+        # If start has not been called yet because the recorder is
+        # still starting up we want history to use the current time
+        # as the created time to ensure we can still return results
+        # and we do not try to pull data from the previous run.
+        return self._current_run_info or RecorderRuns(
+            start=self.recording_start, created=dt_util.utcnow()
+        )
 
     def get(self, start: datetime) -> RecorderRuns | None:
         """Return the recorder run that started before or at start.

tests/components/recorder/test_run_history.py

@@ -45,3 +45,14 @@ async def test_run_history(recorder_mock, hass):
         process_timestamp(instance.run_history.get(now).start)
         == instance.run_history.recording_start
     )
+
+
+async def test_run_history_during_schema_migration(recorder_mock, hass):
+    """Test the run history during schema migration."""
+    instance = recorder.get_instance(hass)
+    run_history = instance.run_history
+    assert run_history.current.start == run_history.recording_start
+    with instance.get_session() as session:
+        run_history.start(session)
+    assert run_history.current.start == run_history.recording_start
+    assert run_history.current.created >= run_history.recording_start