Thingsboard PE Data Rule Chains

I need a set of production-ready data-processing rule chains built inside Thingsboard Professional Edition to turn raw energy meter telemetry into a clean, timestamp-aligned kWh delta that my dashboards can consume.

The flow I have in mind is straightforward: incoming readings arrive through MQTT, the rule chain pulls the previous value, calculates the delta in kWh, discards spurious negatives, then writes the result back to the correct asset’s timeseries and to a daily aggregation node. Once that pipeline is solid I can build my own widgets, so your focus is strictly on the rule-chain logic, node configuration and clear documentation.

I can make available:
- Metric names from devices
- Live overview of our Thingsboard Instance and what we want via Teams or Zoom.

Deliverables
• JSON export of each finished rule chain ready for import
- Tested and functional rule-chains.

Acceptance criteria
The Rule chain MUST work on the clients Thingsboard PE instance. Testing carried out live with myself.
Devices will have kWh Delta for HH, Daily and Monthly periods as new telemetry keys within the devices.

When you reply, share past work that shows you have already built or tuned Thingsboard rule chains, especially around energy or time-series transformations. A concise example or link is enough—I’m interested in proven experience rather than a lengthy proposal.

Let me know your estimated turnaround and any clarifications you need.