32 lines
1.1 KiB
Python
32 lines
1.1 KiB
Python
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"""Purge old data helper."""
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from datetime import timedelta
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import logging
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import homeassistant.util.dt as dt_util
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from .util import session_scope
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_LOGGER = logging.getLogger(__name__)
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def purge_old_data(instance, purge_days):
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"""Purge events and states older than purge_days ago."""
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from .models import States, Events
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purge_before = dt_util.utcnow() - timedelta(days=purge_days)
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with session_scope(session=instance.get_session()) as session:
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deleted_rows = session.query(States) \
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.filter((States.created < purge_before)) \
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.delete(synchronize_session=False)
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_LOGGER.debug("Deleted %s states", deleted_rows)
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deleted_rows = session.query(Events) \
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.filter((Events.created < purge_before)) \
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.delete(synchronize_session=False)
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_LOGGER.debug("Deleted %s events", deleted_rows)
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# Execute sqlite vacuum command to free up space on disk
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if instance.engine.driver == 'sqlite':
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_LOGGER.info("Vacuuming SQLite to free space")
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instance.engine.execute("VACUUM")
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