The dashboard's host widgets took 18-60 s. Every "latest reading" query
(hosts overview, host-agent fleet, host page, vitals, SNMP, MCP get_host)
searched plugin_metrics for the newest row per metric. Postgres has no skip
scan, so each one read every raw sample in the 7-day window.
- plugin_metric_latest: one row per (source, resource, metric).
record_metrics upserts it in the same transaction, moving forward only and
in sorted key order. Migration 0030 seeds it by stepping the existing index.
- Retention drops a latest row once its sample leaves the raw window, so a
resource that stopped reporting disappears when its history does, as before.
Renames carry it along.
- A quiet host keeps its last values, marked stale. A time-bounded query
would have shown it as missing.
- Vitals sparklines span the 6 h they claim, averaged in SQL to ~120 points,
instead of fetching 6 h raw and drawing the last 120 samples.
- Dashboard and share-view cells: "Loading…" until the first answer; a 20 s
deadline per fetch; "Couldn't load (why)" with Retry now and an automatic
retry for cells that don't poll; "as of HH:MM" in the header, and
"couldn't refresh · as of" when a refresh fails over shown data.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Milestone 72 phase D — the dashboard view IS the edit surface (operator ask):
- /d/<id> renders the grid via Gridstack in STATIC mode — positioned exactly like
before, live HTMX widget bodies keep polling. An "Edit" button flips the same
grid interactive (grid.setStatic(false)) in place, so you drag/resize over real
data. "Done" flips it back. Layout autosaves on change.
- The widget picker is now a bottom drawer (position:fixed overlay) revealed by
body.dash-editing — so the dashboard width is identical entering/leaving edit.
- Add: POST returns a single grid item; JS inserts it + grid.makeWidget +
htmx.process so it loads live data. Remove: POST 204 + grid.removeWidget.
Per-panel drag handle + remove ✕ are in the DOM for editors, shown only while
editing.
- Gridstack loads for everyone (viewers get the static grid); edit wiring is
gated on can_edit. Mobile collapses to one column.
- Removed the separate /d/<id>/edit route + edit.html + _edit_panels.html
(rule 22). Dashboard-list Edit and new-dashboard create now deep-link
/d/<id>?edit=1 which opens edit mode on load.
Browser-only behaviour — CI can't exercise it; needs an operator visual check.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>