43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
"""Purge old data helper."""
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from datetime import timedelta
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import logging
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from sqlalchemy.exc import SQLAlchemyError
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import homeassistant.util.dt as dt_util
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from .models import Events, States
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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, repack):
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"""Purge events and states older than purge_days ago."""
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purge_before = dt_util.utcnow() - timedelta(days=purge_days)
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_LOGGER.debug("Purging events before %s", purge_before)
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try:
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with session_scope(session=instance.get_session()) as session:
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deleted_rows = (
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session.query(States)
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.filter((States.last_updated < purge_before))
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.delete(synchronize_session=False)
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)
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_LOGGER.debug("Deleted %s states", deleted_rows)
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deleted_rows = (
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session.query(Events)
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.filter((Events.time_fired < purge_before))
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.delete(synchronize_session=False)
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)
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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 repack and instance.engine.driver == "pysqlite":
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_LOGGER.debug("Vacuuming SQLite to free space")
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instance.engine.execute("VACUUM")
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except SQLAlchemyError as err:
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_LOGGER.warning("Error purging history: %s.", err)
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