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Fix recorder purge (#11802)

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* Do proper largest-of query

* Fix error when event_id is NULL
This commit is contained in:
Lukas Barth 2018-01-19 17:56:28 +01:00 committed by Paulus Schoutsen
parent d697e8e677
commit 51dd9b6dde
1 changed files with 12 additions and 5 deletions
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17
homeassistant/components/recorder/purge.py
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@ -12,7 +12,8 @@ _LOGGER = logging.getLogger(__name__)
def purge_old_data(instance, purge_days):
"""Purge events and states older than purge_days ago."""
from .models import States, Events
from sqlalchemy import func
from sqlalchemy import orm
from sqlalchemy.sql import exists
purge_before = dt_util.utcnow() - timedelta(days=purge_days)
@ -20,12 +21,18 @@ def purge_old_data(instance, purge_days):
# For each entity, the most recent state is protected from deletion
# s.t. we can properly restore state even if the entity has not been
# updated in a long time
protected_states = session.query(States.state_id, States.event_id,
func.max(States.last_updated)) \
.group_by(States.entity_id).all()
states_alias = orm.aliased(States, name='StatesAlias')
protected_states = session.query(States.state_id, States.event_id)\
.filter(~exists()
.where(States.entity_id ==
states_alias.entity_id)
.where(states_alias.last_updated >
States.last_updated))\
.all()
protected_state_ids = tuple((state[0] for state in protected_states))
protected_event_ids = tuple((state[1] for state in protected_states))
protected_event_ids = tuple((state[1] for state in protected_states
if state[1] is not None))
deleted_rows = session.query(States) \
.filter((States.last_updated < purge_before)) \