We recently performed a zero downtime Postgres upgrade at Knock. This blog post goes into details about the Postgres considerations, although the BEAM & Elixir ecosystem were invaluable in managing the cutover process. 

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A blog post discusses the details of a zero downtime Postgres upgrade at Knock, highlighting the use of the BEAM & Elixir ecosystem in managing the cutover process.

Blog Post: Zero downtime Postgres upgrades | Knock