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Pump-shutdown deadlock fix split across two submodules: - rotatingMachine@8f9150e: shutdown sequence clears state.delayedMove so the abort-and-return-to-operational path doesn't auto-pickup the queued setpoint and re-engage the pump. - machineGroupControl@ea2857f: turnOffAllMachines clears MGC's _delayedCall and serializes per-pump shutdown so PS's 2 s tick loop can't interrupt an in-flight shutdown. Live verification on pumpingstation-complete-example demo: basin now shuts pumps off at stopLevel cleanly, reverses to fill, completes the hysteresis cycle. Also disable the trends page in the demo flow (build_flow.py + regen flow.json). FlowFuse ui-chart's per-series server-side history buffer (7 charts × ~20 series × 3600-point retention) was saturating the Node-RED event loop at 129% CPU, making the dashboard freeze on every click. Trends remain available — just disabled by default; flip the ui_page_trends "d" key to false to re-enable. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>