Minor bump — no operator action required (Postgres/ClickHouse changes are automatic). - Postgres: use pgautoupgrade/pgautoupgrade:18-alpine in place of the custom pg_upgrade entrypoint. The existing cluster is upgraded in place automatically on deploy; PGDATA pinned to the legacy path; adds a pg_isready healthcheck. Removes entrypoint.postgres.sh.tmpl and DB_ENTRYPOINT_VERSION. - ClickHouse backup fetch: cache the clickhouse-backup binary on the persistent volume and retry with backoff to avoid the download crash-loop. The tool is required — if it can't be installed after retries the entrypoint aborts and the server does not start, rather than coming up without backup/restore. - Add CLICKHOUSE_DATABASE_URL; bump the clickhouse entrypoint config version. - Remove a stray broken link reference in the README.
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