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When we start compute with newer version of extension (i.e. 1.2) and then rollback the release, downgrading the compute version, next compute start will try to update extension to the latest version available in neon.control (i.e. 1.1). Thus we need to provide downgrade scripts like neon--1.2--1.1.sql These scripts must revert the changes made by the upgrade scripts in the reverse order. This is necessary to ensure that the next upgrade will work correctly. In general, we need to write upgrade and downgrade scripts to be more robust and add IF EXISTS / CREATE OR REPLACE clauses to all statements (where applicable). Adds downgrade scripts. Adds test cases for extension downgrade/upgrade. fixes #7066 This is a follow-up for https://app.incident.io/neondb/incidents/167?tab=follow-ups Signed-off-by: Alex Chi Z <chi@neon.tech> Co-authored-by: Alex Chi Z <iskyzh@gmail.com> Co-authored-by: Anastasia Lubennikova <anastasia@neon.tech>