Fix purge of legacy database events that are not state changed (#72815)

homeassistant/components/recorder/queries.py

@@ -631,7 +631,7 @@ def find_legacy_event_state_and_attributes_and_data_ids_to_purge(
         lambda: select(
             Events.event_id, Events.data_id, States.state_id, States.attributes_id
         )
-        .join(States, Events.event_id == States.event_id)
+        .outerjoin(States, Events.event_id == States.event_id)
         .filter(Events.time_fired < purge_before)
         .limit(MAX_ROWS_TO_PURGE)
     )

tests/components/recorder/test_purge.py

@@ -26,7 +26,7 @@ from homeassistant.components.recorder.services import (
 )
 from homeassistant.components.recorder.tasks import PurgeTask
 from homeassistant.components.recorder.util import session_scope
-from homeassistant.const import EVENT_STATE_CHANGED, STATE_ON
+from homeassistant.const import EVENT_STATE_CHANGED, EVENT_THEMES_UPDATED, STATE_ON
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.typing import ConfigType
 from homeassistant.util import dt as dt_util
@@ -925,6 +925,15 @@ async def test_purge_without_state_attributes_filtered_states_to_empty(
                     time_fired=timestamp,
                 )
             )
+            session.add(
+                Events(
+                    event_id=event_id + 1,
+                    event_type=EVENT_THEMES_UPDATED,
+                    event_data="{}",
+                    origin="LOCAL",
+                    time_fired=timestamp,
+                )
+            )
 
     service_data = {"keep_days": 10}
     _add_db_entries(hass)