## Context
`PromiseMemoizer` sits in front of the staged lookup (local cache →
Redis hash validation → Redis data → DB recompute) of both
`CoreEntityCacheService` and `WorkspaceCacheService` (10s TTL each). The
Redis hash check is the **only** cross-instance invalidation mechanism —
there is no pub/sub — and it runs only when the memo entry expires.
The TTL is currently **sliding**: every read refreshes `lastUsed`, and
eviction compares against time-since-last-read. So any entry read more
often than every 10s on a given instance never revalidates, and that
instance serves stale data for as long as traffic continues. Affected
data: auth-context entities (workspace, user, userWorkspace), API key
revocations, role/permission maps, RLS predicates, feature flags, and
all metadata maps.
Observed manifestation: after `activateWorkspace`, a sibling instance
kept serving a `PENDING_CREATION` workspace snapshot (kept alive
indefinitely by the client's own polling), stranding signup on a
permanent loading skeleton at `/create/profile` (#21461). Same staleness
class as #20322 and the CI flakes investigated in #21435.
## Why it was sliding
#11444 (April 2025) deliberately changed the TTL from absolute to
sliding because the memoizer's then-consumer was the TypeORM datasource
storage: absolute expiry was destroying datasources that were actively
in use (`onDelete` → `destroy()`), causing worker `Connection
terminated` errors. That consumer no longer exists — datasources moved
to `GlobalWorkspaceOrmManager`, and neither remaining consumer passes
`onDelete` or holds resources needing keep-alive.
## Fix
Restore absolute expiry: `expiresAt` is set at write time and never
refreshed on read. Every instance now re-enters the staged lookup (and
thus the Redis hash validation) at least once per TTL, restoring the
designed ≤10s cross-instance staleness ceiling. Concurrent dedup
(`pending` map) and `onDelete` plumbing are unchanged.
## Test plan
- New regression test: reads at half-TTL intervals must not extend an
entry's lifetime (fails on the sliding implementation, passes now).
- Full `promise-memoizer.storage.spec.ts` and
`workspace-cache.service.spec.ts` suites pass (25 tests); lint and
format clean.
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Charles Bochet
08a36aa68f
