Raylux 0.27.0: historian trend aggregation

Long trends stop dragging their whole history across the network, plus a batch of driver and interface fixes.

Trend aggregation

Wide trend windows are now summarised inside the database, so a long trend never leaves it as raw rows. A chart measures its own width and asks for that many points, keeping a minimum/maximum envelope by default so a spike survives being summarised instead of being averaged away.

Measured against the case this was built for: a 30-day trend on a tag logged four times a second — 10,368,000 readings — returns 900 points instead of all of them.

Found and fixed along the way: the trend query had never actually reached a live gateway, in three independent ways.

Also

• Data-quality checks on incoming values: range, rate-of-change and stuck-value detection.
• Tag access defaults to open unless a tag is explicitly restricted, matching the stated security model.
• Allen-Bradley: fixed-length string structures, 32- and 64-bit floats read correctly, structure names shown instead of an internal id, and one bad tag no longer stalls a whole device's polling.
• Studio: importing tags from a device no longer forces the PLC's own folder structure on you, and folders can be ticked as a group.
• Buttons can write back in one-shot, momentary and toggle modes.