Telemetry history — graph + readings
Every Mission Control tile drills into a per-metric history page. The page is calm by default: entry point on top, graph and history collapsible.
Tap any Mission Control tile (fuel, water, holding, engine coolant, engine oil, battery, etc.) to open its history page. Same page also reachable from a row in a snapshot detail view.
Steps
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Header + current reading
Top of the page: metric icon and name, then a big current-value card. With Manual entry chosen as the source on Mission Control, the card carries a prominent 'Update reading' button (and a + in the toolbar) that opens the same entry sheet the Mission Control tile uses. With a gateway as the source there is no button: the card says the values come from the gateway, and switching the source to Manual on Mission Control is how to type one. A reading nobody took shows as a dash, never a zero.
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Graph pill — collapsed by default
Tap to expand. The chart is a Swift Charts sparkline. There's no time-range picker (24h / 7d / 30d isn't a feature today) and no drag-scrub. The pill shows a friendly empty-state when there's no chartable data yet.
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History pill — readings list
Tap to expand. Shows reading count, lists each reading with timestamp; snapshots from before the metric was ever read are left out rather than listed as zero. Toggle 'Show archived (>12mo)' to include readings older than twelve months. Archived means old, not deleted — nothing in theONE deletes a saved reading, and there is no control that could.
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A saved reading cannot be changed
The rows in this list do not open anything — they are text, not buttons. Snapshot Detail exists, reached from the Telemetry list in the Logs hub, and it is read-only.
There is no edit and no delete for a reading you have already saved, anywhere in the app. If you typed a wrong figure, enter the right one: the history keeps both, in order, which is the honest record of what was read and when.