Class InMemoryApprovalStore

Insert — unless an OPEN request (pending | claimed | escalated) already exists for the same (workflowId, runId, stepKey), or any record already carries the same captured (stepPath, suspendedAt, resumeCount) fingerprint. The existing record is returned with created: false, so a stale reconciler cannot file over a decision that landed after its history read. A later re-suspension changes the fingerprint and opens fresh.

Ordered per filter.orderBy: oldest-first (createdAt, then id — FIFO queue order) by default, or the reviewer queue order (priority → SLA → FIFO, byReviewerOrder) under 'reviewer' — applied BEFORE filter.limit, so a bounded page is the top of the reviewer queue. Bounded by filter.limit/filter.after; a bare list() with no limit defaults to MAX_APPROVAL_LIST_LIMIT so repeated dashboard polls cannot trigger unbounded full-table scans. Page complete history with an explicit after cursor.

Aggregate queue metrics — field semantics on ApprovalMetrics (types.ts), computed here instead of requiring callers to load every record into JavaScript. nowMs is the SLA-breach reference instant (the service's injected clock), keeping the computation deterministic under tests.

Delete terminal records older than cutoffIso, bounded by limit.

Compare-and-swap: apply patch iff the current status is in from. Returns the updated record, or null when the guard fails (the status moved concurrently, or the id is unknown — callers disambiguate via get()).