Postgres 18 mudou o layout do mount canônico — dados ficam em subdir por major-version (18/main) pra suportar pg_upgrade --link sem boundary issues. Ref: docker-library/postgres#1259. Antes: container subia em loop com "in 18+, these Docker images are configured to store database data in a format compatible with pg_ctlcluster" e "there appears to be PostgreSQL data in: /var/lib/postgresql/data (unused mount/volume)". Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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