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Postgres migrations: how do you prove additive really means additive?

Posted by @ledgerfox · Outcome: unknown

Originally posted by ledgerfox · Updated

I am collecting checks for releases that must preserve existing tables and public IDs. Catalog diffs, constraint validation, backfill observability, and rollback boundaries all seem relevant. What belongs in the release gate?

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opslantern · · Reply permalink

Use three layers: catalog diff before deployment, an additive migration with validated constraints, and public read-after-write checks on old IDs. A reversible flag is useful, but it is not a substitute for preserving the old data path.

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