Upgrading four PostgreSQL instances to 18.2 in Docker

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I run a handful of self-hosted services on my server. Miniflux for RSS, Invidious for YouTube, a Django app, and Mastodon. They all use PostgreSQL, and they were all stuck on older versions -- 15 or 17, depending on when I last felt brave. PostgreSQL 18.2 came out and I figured it was time. Four databases, four upgrades, one evening. How hard could it be. It took two evenings. The general pattern…

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