Safe non‑transactional DDL execution in Yii 2.x migrations for PostgreSQL
Goal: Ensure a Yii 2.x migration can apply a CREATE INDEX CONCURRENTLY statement on a live PostgreSQL database without causing the migration to fail or leaving the database in an inconsistent state after a rollback. Constraint: Yii migrations wrap each step in a transaction by default, but PostgreSQL rejects CREATE INDEX CONCURRENTLY when executed inside a t
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