Atlas migration — weekly status

Week of Jul 27 2026 · report 11 of 16

At risk

68% completeTarget cutover Sep 14 2026

Migration work is on plan technically — 41 of 60 services now read from Atlas, and last week’s dual-write cutover held for six days with no data drift. The risk is contractual, not engineering: the SSO vendor contract is still unsigned, which gates the identity migration and therefore the cutover date. We need a decision on the cutover date this week, because a slip past Sep 14 pushes us into the clinic onboarding freeze.

Done this week

Dual-write enabled for the booking and waitlist services; six days clean, zero drift on the reconciliation job.
Read traffic moved to Atlas for 41 of 60 services (up from 33).
Rollback runbook rehearsed end to end in staging — 11 minutes, under the 15-minute budget.
Legacy reporting exports reproduced in Atlas and signed off by finance.

In progress

Identity & SSO migration — blocked on the vendor contract, code complete behind a flagDana Whitfield
Remaining 19 service cutovers, batched by dependency tierDevon Okafor
Load test at 3× peak booking volumeInes Okonkwo
Clinic-facing comms plan for the cutover windowMara Chen

Blocked

DWSSO vendor contract unsigned — legal redlines outstanding since Jul 17. Blocks identity migration.High
IOLoad-test environment quota capped at 1.5× peak; cloud limit increase requested Jul 24.Medium
SRTwo clinics have not confirmed a maintenance window for their region.Low

Risks

Risk	Severity	Mitigation
Cutover slips past Sep 14 into the onboarding freeze	High	Decide the date this week; hold Sep 21 as the only fallback
Untested behaviour above 1.5× peak load	Medium	Quota increase, then test Aug 7; shed non-critical jobs if refused
Reconciliation job masks slow drift on low-traffic tables	Medium	Add per-table row-count assertions, shipping Jul 31
Single owner of Atlas schema knowledge	Low	Pair Ines on schema reviews from Aug 3

Decisions needed

Confirm Sep 14 as the cutover date, or move it to Sep 21 now.Owner: Mara Chen · needed by Jul 31. Deciding later costs us the comms window.
Approve escalating the SSO contract to the vendor’s VP of Sales, or switch to the fallback provider.Owner: Dana Whitfield · needed by Jul 30.
Accept a 1.5× load test if the quota increase is refused.Owner: Devon Okafor · needed by Aug 5.