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#release-notes

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Blueprint drawing on pale blue paper: a calendar page with 19 November circled, a database cylinder with a small checklist beside it, and dimension lines measuring the days between release candidate 1 and GA.
System Design

PostgreSQL 19 RC1: the incompatible changes to test before GA on 19 November

JIT is off by default, TOAST compression becomes lz4, RADIUS is gone, standard_conforming_strings is forced on, and btree_gist inet/cidr indexes block pg_upgrade. A test plan and a query that finds the indexes, checked on Postgres 18.6.

· 4 min

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