4) Machine cycles: fix cavities read

You currently have:

const cavities = Number(global.get("moldActive") || 0);


If moldActive is an object, Number(obj) → NaN.

✔️ Use the property:
const cavities = Number((global.get("moldActive") || {}).cavities) || 1;


Also guard negative produced:

const produced = Math.max(0, totalProduced - scrapTotal);

🧱 5) ID consistency in SQL

In your flow, SQL uses work_order_id. In your start-tracking example inside “Work Order buttons”, you used WHERE id = ....

✔️ Make them consistent (use work_order_id):
topic: `UPDATE work_orders SET production_start_time = ${now}, is_tracking = 1 WHERE work_order_id = '${activeOrder.id}'`


Same consistency in resume/restart and persist queries.

🧰 6) Format Graph Data: keep messages clean to UI

Before returning to the template, strip SQL fields so nothing accidentally loops into DB:

delete msg.topic;
delete msg.payload;
return msg;

🧯 7) MariaDB guard

You already create two Switch nodes. Keep the rule:

Property: msg.topic

Rule: is type → string

And wire every DB path through it (graphs fetch + cycles persist). That eliminates the “query is not defined as a string” spam.

✂️ Minimal diffs you’ll likely want
Machine cycles (core lines)
const cavities = Number((global.get("moldActive") || {}).cavities) || 1;
// ...
const produced = Math.max(0, totalProduced - scrapTotal);
// ...
const persistCycleCount = {
  topic: "UPDATE work_orders SET cycle_count = ?, good_parts = ? WHERE work_order_id = ?",
  payload: [cycles, produced, activeOrder.id]
};

Fetch Graph Data (SELECT list)
msg.topic = `
  SELECT work_order_id, status, good_parts, scrap_parts, progress_percent,
         target_quantity, updated_at, cycle_count
  FROM work_orders
  WHERE updated_at >= NOW() - ${interval}
  ORDER BY updated_at ASC
`;

Format Graph Data (efficiency + cleanup)
const good = Number(row.good_parts) || 0;
const target = Number(row.target_quantity) || 0;
let eff = (row.progress_percent != null)
  ? Number(row.progress_percent)
  : (target > 0 ? (good / target) * 100 : 0);
eff = Math.min(100, Math.max(0, eff));
efficiencyData.push(eff);

// before return:
delete msg.topic;
delete msg.payload;
return msg;

Work Order buttons (“start-tracking” WHERE clause)
topic: `UPDATE work_orders SET production_start_time = ${now}, is_tracking = 1
        WHERE work_order_id = '${activeOrder.id}'`,