CR-01 fixed web5.lnd-info/web5.networking-profits to persist:false, stopping
FUTURE writes to sessionStorage, but a tab already open before the update
ships reloads in-place onto the new bundle and keeps whatever the OLD
bundle already wrote under the old decision — indefinitely, since nothing
but clearAll() (logout) ever purges a resource: snapshot. Long-lived tabs
(installed PWA, kiosk display) are normal here, so this left updating users
exposed to exactly the T-02-01 exposure CR-01 was meant to close.
- Add a schema-version marker (resource:__schema) checked once at store
setup: absent or stale marker purges every resource:-prefixed
sessionStorage key, then writes the current version. One-time per tab
session (a matching marker no-ops), not per navigation/reload, so this
doesn't defeat the instant-paint-from-snapshot benefit the cache exists
for. CURRENT_SCHEMA_VERSION must be bumped whenever a key's persist
decision changes, documented inline as the contract for future changes.
- Extract clearAll()'s purge loop into purgeAllSnapshots(), reused by both
clearAll() (logout, T-02-02) and the new migration, so there's one place
that enumerates/removes resource: keys.
- Close the residual refresh()/useCachedResource() default: opts.persist
?? true was the exact footgun that caused CR-01 (a call site silently
opting into persistence by omission). persist is now a required
parameter on refresh() and useCachedResource()'s options, matching the
entry()/optimistic() hardening WR-04 already applied.
- Tests: legacy snapshot (no/stale marker) is purged on init; a snapshot
under the current marker survives a later init (proves one-time, not
every-boot); persist:false never writes a snapshot; marker is written
after purge; purge is strictly bounded to the resource: prefix (seeded
non-resource: sessionStorage keys and a localStorage auth flag survive
byte-for-byte); migration cannot race an in-flight fetch (runs
synchronously at store setup, before entries/inflight can hold anything).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
