The original title is "Before the DDL: What a Useful Postgres Migration Rehearsal Must Show"

Short summary

A product brief for a Postgres migration rehearsal tool that runs DDL changes against synthetic data under concurrent load to surface lock contention and blocking chains. It complements existing lint tools like Squawk and Bytebase by providing an execution card with lock modes, blocking timelines, and rollback actions rather than a simple safe/unsafe verdict. The author acknowledges the core risk of false confidence since synthetic load cannot replicate production traffic patterns.

• •Proposes a Postgres migration rehearsal tool that tests DDL under concurrent load in an isolated environment
• •Complements existing lint tools by providing lock timelines, blocking chains, and execution cards instead of pass/fail labels
• •Acknowledges limitations: synthetic data cannot replicate production traffic, skewed keys, or long transactions

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