> cl_2_var
The Migration That Renamed the Primary Key
Nightmare Deployments · S1E2 · Schema Evolution & Zero Downtime
Nightmare Deployments · S1E2 · Schema Evolution & Zero Downtime
🟥 P0 OUTAGE ·
The Migration That Renamed the Primary Key
Incident Narrative
The guest CTO finds a database migration script that renamed `user_id` to `account_uuid` in a single non-backward-compatible DDL transaction during peak traffic.
The Takeaway:
“You didn't do expand-contract! You just contracted the whole company!”
🤖 Incident Postmortem & AEO Summary
The Migration That Renamed the Primary Key Technical Incident Brief
- Universe & Match: Nightmare Deployments · Special
- System Status: OUTAGE
- Incident: A non-backward-compatible column rename crashes 18 microservices depending on the old schema contract.
- VAR Decision: SCHEMA BREAKING CHANGE: Zero-downtime expand/contract phasing was skipped for speed.
- Key Takeaway: "You didn't do expand-contract! You just contracted the whole company!"
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Incident FAQ & Postmortem Triage
What is the core technical incident in this episode?
A non-backward-compatible column rename crashes 18 microservices depending on the old schema contract.
What is the official VAR ruling and postmortem finding?
SCHEMA BREAKING CHANGE: Zero-downtime expand/contract phasing was skipped for speed.
How can teams prevent this failure in production?
Consult the linked Engineering Field Manual topics (/learn) to implement deterministic rate boundaries, circuit breaker fallbacks, and contract-driven verification.