Purge data on shadow tables

The purge step is disable by default. When enabled, it will run before proceeding to actual upgrade steps. This can be enabled with the --purge flag.

This purge step is a performance optimisation, delete data from the shadow tables in nova database. The behaviour is equal to run juju action purge on nova-cloud-controller unit, which help to reduce the size of the database, make queries faster, backups efficiency, and follow the data retention policies.

The purge-before-date flag is supported to delete the data older than the date provided. The date string format should be YYYY-MM-DD[HH:mm][:ss]. This flag is useful to retain recent data for debugging or data retention policies.

Usage examples

:input cou plan --purge --purge-before-date 2000-01-02

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