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Data Retention

Dash stores history data in PostgreSQL + TimescaleDB. Redis primarily stores runtime state.

Data Classes​

  • Metrics history.
  • Network traffic facts and rollups.
  • Nodes, groups, and system settings.
  • Alert rules, events, runtime state, and notification outbox.
  • Theme package metadata.

Retention Config​

Normal metric retention:

database:
  retention_days: 45

Traffic fact retention:

database:
  traffic_retention_days: 90

Changing retention affects future policy sync. Existing chunks are removed by TimescaleDB policy execution.

Tables​

Normal metrics retention covers the metric hypertables, including disk IO, disk usage, NIC metrics, and physical disk temperature.

Traffic retention covers 5-minute traffic facts. Monthly snapshots are retained separately as accounting output.

Backup Boundary​

Retention policy is not a backup strategy. Back up PostgreSQL before upgrades, migration work, retention changes, and storage migration.