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.
