A canvas node carries a full copy of its Device Inventory row, hydrated when
the canvas loads. The save routed all of it back, so a save made for nothing
but a moved node rewrote the row from a snapshot that could be hours old —
silently reverting an edit made meanwhile in the inventory modal, on another
canvas, or by the scanner.
Diffing the payload against the row server-side cannot fix this: it can't tell
"I edited this" from "the row moved on since I loaded it". Only the client
holds the baseline.
- canvasStore keeps `factsBaseline` — the device facts as received — set on
load, refreshed on save, rebased per field by `applyDeviceFacts`.
- `serializeNode` sends `changed_facts`: what this canvas actually edited.
`link_facts(changed_fields=)` writes nothing outside that list, even where
the values differ. Absent (older client, YAML import, MCP) keeps the previous
full-write behaviour.
- `changed_facts()` additionally drops facts already equal to the row, so a
no-op save writes nothing. Identity matching still uses the full payload.
- Live fields (status, last_seen…) bypass the filter — the status checker owns
reachability, and a save only ever fills a row never checked.
An inventory edit also lands on the canvases already on screen:
`applyDeviceFacts` pushes the saved row onto every node drawing it, without
marking the canvas unsaved. A fact the canvas has edited but not saved is left
alone — work in progress wins locally and still saves.
ha-relevant: maybe
Pouzor
0c7fd3c127