Materialized capacity/openresty hourly tables only hold data after the MV
exists. Preferring any non-empty rollup hid full raw history and left 24h
charts with only recent hours. Use rollup only when its earliest bucket
covers the query window start.
Lower merge-tree free-entry thresholds for small background pools, bind
listen_host to 0.0.0.0 for published ports, and allow CLICKHOUSE_ENABLED=true
in tests for live_ch smoke coverage.