The recovery kit, "Keys the backups still need" and safeToDropRetiredKeys
read only the stored copies and the off-host account objects. After a
rotation the page called the old key safe to drop while every dump taken
before it, the pre-migration dumps that are the way back from an update
among them, could only be restored with that key: db-restore refuses a dump
whose active key is missing.
A dump now counts for the key its rows were written under, the manifest's
active key: a dump on this server while it is kept (read from the manifests),
an off-host one until the bucket's rule for database/ expires it, or
indefinitely when that rule cannot be read. The nightly run records the key
on its ledger row (migration 0489, database_backup_runs.active_key_id). The
encryption view and the kit list the dumps per key, in every locale, and the
rotation and backup runbooks say so.
Deleting an account, deleting a managed profile, "Delete all data" and the
admin wipe now write an off-host deletion request in the same transaction
as the deletion. A new job (offhost-backup-purge, kicked straight away and
run nightly as a backstop) lists the bucket once, deletes every
<date>/user-<id>.json.enc object of each pending account and removes the
request only when nothing of the account is left. A refused delete keeps
the request with the bucket's answer and is retried; the off-host card
shows how many deletions are outstanding and why. A copy the nightly run
was writing while the account was deleted is taken back after the upload.
The off-host card also reads the bucket's lifecycle rule and says plainly
when there is none (every nightly copy kept forever) or when the
credential may not read it.
Every stored backup now records the key ids its content was written
under, and every off-host upload records the same per key. The admin
encryption view lists, per key, the stored copies that need it with the
oldest date, and when the last off-host copy needing it expires. The
"safe to drop" badge now requires that no backup still needs a retired
key, instead of only that every row was rotated.
Migration 0358 adds data_backups.inner_key_ids, the key-use table and the
deletion requests.
Marc-André Bombeck