SONOFF SWV real_time_irrigation_volume does not reset between irrigation cycles

What happened?

The real_time_irrigation_volume sensor for the SONOFF SWV (and SWV-BSP) does not reset to 0 when a new irrigation cycle starts or ends.

Instead of reporting the water volume delivered during the single/current session, the value keeps accumulating across multiple runs, behaving like an ongoing cumulative counter rather than a real-time session volume.

What did you expect to happen?

real_time_irrigation_volume should either reset to 0 at the beginning of each irrigation session or report only the total volume delivered during the last completed cycle.

How to reproduce it (minimal and precise)

1. Run an irrigation cycle on SONOFF SWV and observe real_time_irrigation_volume.
2. Stop the irrigation.
3. Run a second irrigation cycle.
4. Observe that real_time_irrigation_volume resumes from the previous value instead of resetting to 0.

Device details

• Device Model: SONOFF SWV / SWV-BSP
• IEEE Address: 0xf4b3b1fffe4df5e4
• Firmware Version: 1.0.4 (4100)
• Zigbee2MQTT Version: 2.13.0

Zigbee2MQTT version

2.13.0

Adapter firmware version

7.4.3 [GA]

Adapter

ZBDongle-E

Setup

Zigbee2mqtt on docker container

Device database.db entry

No response

Debug log

No response

Notes

No response

Start by locating the SONOFF SWV/SWV-BSP device definition and the handling of real_time_irrigation_volume in the TypeScript source. Reproduce two irrigation cycles using the reported device setup, then verify that the sensor resets at the start or end of a cycle, with regression coverage for the observed accumulation.