Verify USD→EUR premium migration on 2026-10-04 (gautierdr@gmail.com) #88

Manual migration executed 2026-09-16 (runbook: platform/devops/docs/GLM52-PREMIUM-TIER.md §10, PRs #375 + helmcode/nan-devops#388). The member's premium subscription was created with trial_end = 2026-10-04 23:08 UTC; the old USD subscription dies the same day. Verify on/after that date:

• Premium sub_1UGEnQBF7qtPjBKwp1MuIhXF (customer cus_VGmHhDGnt8n4xy) renewed active — invoice paid on visa ****5422 (default PM already set on sub + customer)
• Old USD sub_1TTVarBF7qtPjBKwgw74qRln shows canceled and the member did NOT enter grace (expected: webhook stale-event guard skips it — check platform-api logs)
• members.glm_access still true for gautierdr@gmail.com; no unexpected revoke
• If the member logged in since: LiteLLM key converged into nan-eu-premium team (reconciler, within ~1h of provisioning — member had no key at migration time)

If the renewal failed: the subscription goes past_due and the revoker strips glm_access — the member loses all access. Stripe dunning emails reach the member reactively; no proactive alert exists for this failure mode today.