The per-account preview switch was kept for the topic overview pages,
which were dropped before they shipped. Its one flag was stored, served
and backed up, and read by nothing; the column-reader audit listed it as
a pending consumer that will not come.
Removed completely:
- `/api/settings/preview-features` (GET, PATCH) is retired: it answers
410 Gone with `meta.errorCode: route.retired` and `removedIn: 1.46.0`,
and the contract publishes it under Retired. The route, its validation
schema, the `PreviewFeatures` OpenAPI schemas and the settings module
are deleted.
- Migration 0485 drops `users.preview_features_json` under a bounded lock
wait, with the retry marker.
- The backup no longer writes the field. A file from v1.44 or v1.45 that
carries it still restores: the schema accepts it and no codec reads it,
so nothing is refused or written for it. The backup-parity goldens
lose the field and apply one setting fewer.
- The data-wipe plan entry and the sharing-surface actor entry go with
the route (frozen count 273 -> 272).
No client build reads the route: neither iOS repository nor any local
checkout references it.
POST /api/admin/backups/upload stores a backup file as a new copy, the
copy whose id the published restore takes, and it refuses a file for
reasons an operator has to be able to look up: a key this server does
not hold (backup.key.missing, with the key ids), an owner account that
does not exist here, a newer schema, a copy too large to store
(backup.upload.too_large). It was exempted from the contract as console
plumbing while its two siblings were published for exactly that kind
of refusal.
It is registered with the three bodies it reads (raw JSON, raw gzip, a
small multipart form) and every status it answers; the summary is the
three identity fields plus one integer count per class, so a class the
backup format gains later does not break a decoder. The round-trip
test calls it through the contract now.
The SETTING verdicts are now the keys of the codec table, so a column
becomes a setting by getting a codec and nothing else has to name it. The
verdicts for every other User column move beside it into
account-settings-classes.ts, and the restore half into
account-settings-restore.ts. The backup plan keeps the model verdicts.
The classification guard now also refuses a column that has both a codec
and another verdict, since the composed table would quietly carry it as a
setting.
One table holds an entry per write route, and every User column the backup
classifies as a setting appears in exactly one entry; a new setting column
fails the inventory case until it has one. For each entry the file sets a
non-default value through its write route, reads it back through its read
route and through /api/auth/me where that publishes it, and checks the stored
column moved off what a fresh account holds.
The backup leg runs through the routes too: the portable full backup a
person downloads, the operator's upload, and the restore into an account
recreated under the same id. Every setting must read back identically on the
restored account, through the same routes and the account payload, and every
stored column must come back with its value.
Marc-André Bombeck