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The tag-publish workflow (container.yaml) built backend/Dockerfile with no build-args, so UV_EXTRAS was empty and the published *-backend image shipped without the Postgres driver (only --extra redis). Multi-replica deployments (K8s/Helm) that need shared Postgres persistence instead of file-based SQLite could not use the release image without rebuilding it. Pass UV_EXTRAS=postgres so the release image includes deerflow-harness[postgres]. Additive only: single-replica sqlite/redis setups keep working; the Postgres driver is added, mirroring how redis is already always baked in.