Developer Guide
Postgres Zero-Downtime Flow Diagram: One-Page Production Guide
A 30-second migration flow reference for zero-downtime PostgreSQL releases.
2026-05-24
3 min
Tweetable Definition#
Zero-downtime migrations are a sequence, not a SQL file.
Production Risk Warning#
Skipping migration sequencing can block writes across auth, checkout, and dashboards.
Copy-Ready Snippet#
sql
alter table public.accounts add column plan_code text;
Flow Diagram#
mermaid
flowchart LR
A["Expand schema"] --> B["Deploy compatible app"]
B --> C["Backfill in batches"]
C --> D["Switch reads/writes"]
D --> E["Contract legacy schema"]
30-Second Checklist#
- Expand first (non-breaking schema).
- Deploy compatibility code.
- Backfill with monitoring.
- Cut traffic to new path.
- Remove old column/logic last.
Related Incidents#
Related Assets#
One email a month — no fluff
RLS gotchas, Next.js cache debugging, and the one Supabase setting that bit me last month.
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