Only two of the four keys flagged as unused actually were. gitea and invidious
ADMIN_PASSWORD are written by their auth adapters through authPersistCfg, which
builds the name as CFG_${app^^}_${key} from a parameter — invisible to a literal
grep, which is why the earlier pass called them dead. They stay.
Worse, the slot rename broke that write path for five apps: adguard, bookstack,
gitea, invidious and nextcloud all persist ADMIN_PASSWORD, and the config now
holds ADMIN_PASSWORD_1. updateConfigOption only rewrites a key that already
exists, so the write became a no-op — the app's password would really change
while the config and the WebUI kept showing the old one.
authPersistCfg now falls back to the numbered slot when the bare key is absent,
so adapters never need to know how a credential is numbered and adding a slot
can't silently disconnect the adapter that writes it. When neither name exists
it warns and returns non-zero instead of failing silently, which surfaces a
pre-existing case: linkding's adapter persists ADMIN_USER and ADMIN_PASSWORD but
its config declares neither, and never did.
Deleted the two that really are dead: CFG_TRAEFIK_ADMIN_PASSWORD_1 (its adapter
uses CFG_TRAEFIK_USER/CFG_TRAEFIK_PASS from the system config) and
CFG_GLUETUN_CONTROL_SERVER_API_KEY_1, plus their WebUI field mappings.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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