## Problem
Sentry (high severity, SLA-breaching): `Billing Subscription Not Found:
No active subscription found for workspace …`
The `billingSubscription` workspace-cache provider
(`WorkspaceBillingSubscriptionCacheService.computeForCache`) called
`getCurrentBillingSubscriptionOrThrow`. For a workspace whose
subscription is fully canceled, `getCurrentBillingSubscription` filters
out `Canceled` and returns `undefined`, so the provider **threw**
`BILLING_SUBSCRIPTION_NOT_FOUND`.
That cache key is read on every usage-recording path:
- workflow execution
(`WorkflowExecutorWorkspaceService.sendWorkflowNodeRunEvent`)
- AI usage (`AiBillingService`)
- logic-function execution (`LogicFunctionExecutorService`)
- app charges (`AppBillingService`)
- the gate `BillingUsageService.canFeatureBeUsed` /
`hasAvailableCredits` / `decrementAvailableCreditsInCache`
- the cancellation webhook
(`invalidateAndRecompute('billingSubscription')`)
So any of these throws an unhandled exception for a
no-active-subscription workspace. The intent was clearly to tolerate
this state — `canFeatureBeUsed` already guards with
`isDefined(billingSubscription)` and the workflow runner logs *"there is
no subscription for this workspace"* — but the throwing provider made
those guards unreachable.
## Fix
- `computeForCache` now returns `FlatBillingSubscription | null` via the
non-throwing `getCurrentBillingSubscription`, and the cache type allows
`null`.
- Every consumer guards the absent case (`isDefined` / optional
chaining) and no-ops: usage events still emit with an undefined
`periodStart`, credits aren't decremented, `hasAvailableCredits` returns
`false`.
- `getCurrentBillingSubscriptionOrThrow` is **left untouched** for the
many callers (resolver, subscription-update, etc.) that genuinely
require a subscription.
## Test
Adds `workspace-billing-subscription-cache.service.spec.ts`: the
provider returns `null` when there's no active subscription (regression)
and the flattened subscription when one exists.
All 142 tests across the billing / ai-billing / workflow-executor suites
pass; `oxlint --type-aware` and `oxfmt` are clean.
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Charles Bochet
9bb98fa5b5
