OptionalPAGE_KV?: PageKv | nullOptionalPAGE_KV_ENABLED?: string | nullforce the tier on ('1') or off ('0'), overriding the per-plan default
OptionalPAGE_KV_TTL?: string | number | nullseconds; a stored page is also generation-keyed, so this is a floor on garbage not a freshness knob
optional: the tier is absent rather than broken when this is not bound