Threshold for transitioning projects to physical backups lowered to 40GB

[darora]

Further to https://github.com/orgs/supabase/discussions/18654 , the threshold for transitioning large databases to use physical backups for their daily backups is being lowered to 40GB over the next few days.

Physical backups are more performant, have lower impact on the db, and avoid holding locks for long periods of time. Restores continue to work as expected, but backups taken using this method can no longer be downloaded from the dashboard.

Over the next few months, we'll be introducing functionality to restore to a separate, new database, allowing for the perusal of the backed up data without disruption to the original project.

Please refer to supabase.com/docs/guides/platform/backups#daily-backups-process for additional details.