The idempotent upgrade only created missing object stores, so bumping
DATA_VERSION no longer reset bad or stale data — it just added stores. This
restores a bump as a true global cache flush: the upgrade now clears every
existing store before recreating any missing ones, so shipping a version
bump forces all clients to refetch fresh on next boot.
Gated on oldVersion > 0 so fresh installs skip the flush, and clearing
before creating means only pre-existing stores are touched. This is the
break-glass lever for the one non-self-healing failure mode (non-empty
store holding wrong-shaped data paired with a matching cache key), e.g.
after a serializer shape change shipped without a version bump.
Introduces cacheableModels.js as the source of truth for which models the
client caches in IDB and how to dispatch their revalidate actions. DataManager
derives modelsToSync from the registry and creates object stores
idempotently, so adding new cached models needs only one place to change
plus a one-time DATA_VERSION bump.
Also fixes two latent bugs that the upcoming boot-hydration relies on:
setCacheKeys now awaits all per-key writes (was async-forEach with no await),
and replace awaits clear before push (avoids ConstraintError on rapid
refetches).
Shivam Mishra