[1/8] Add a Trends screen that replaces Statistics - #2637

Part 1 of the series splitting #2621. Updated after Pete's review (3 November 2026): Trends now replaces Statistics, each figure appears once, and the day page, Gaps and Export have moved to follow-up parts.

Trends reviews one period at a time: a day, 7, 14, 30 or 90 days. It opens from Settings → Trends, where Statistics was, as a sheet with a Done button.

• Summary: average glucose with SD and CV, GMI with its IFCC value, carbs per day and boluses per day. Each tile carries its target.
• Time in range: five bands, each with its target in its row and its hours a day of CGM-covered time.
• Daily pattern (AGP).
• Insulin: daily totals with the average, basal against its schedule, bolus split into manual, automatic and unknown, and "today so far, usually X U by now" when the period ends today.
• Loop status: closed loop, limited and open loop, from Loop's stored settings.
• One day: a one-day period leads with that day's timeline.

Where the figures come from

• Inside Loop's local history (the cache duration, 90 days by default) figures come from Loop's stores. For each kind of data the boundary is the later of the cache start and Loop's first record of that kind; before it, Trends reads Apple Health. The two never overlap.
• Closed and open loop come from StoredSettings.dosingEnabled, which SettingsStore keeps for the cache duration, including the record before the period. A manual temp basal counts as open loop, as on the home screen since Show the loop as open while a manual temp basal is running #2649, from the temp basal's own record and its end or cancellation.
• Manual and automatic are read from each bolus's own record. A bolus that doesn't record it shows as unknown, never as manual. Logged injections count as manual.
• Scheduled basal is shown only for days Loop has its own schedule history, with "N of M days" when that's part of the period. Older days don't fall back to today's schedule. Dated settings bound both basal and target schedules: time before the first saved profile, or a saved record without that profile, stays unknown. Those gaps supply neither scheduled totals nor inferred basal delivery.
• GMI always shows. "Best over 14 days with 70% CGM data" appears when the period is shorter or coverage is lower (the 2019 international consensus and ADA 2026 guidance).
• Fingerstick readings are left out of every figure, as in Statistics.

Colours

One new colour set. Marks use Loop's existing glucose, insulin, carbs and accent; text uses .primary and .secondary; the AGP bands, target band and basal are those colours at reduced opacity. Time in range uses GlucoseBand.agpColor, which gains dark-mode variants (Current Setup picks these up). The period picker is a system segmented Picker.

The one addition is a darker bolus (light #A9480A, dark #FFA347). Plain insulin bolus beside faded insulin basal was too close to tell apart in use: insulin is only 2.3:1 on white, so no lighter tint of it reaches 3:1 against it. With the darker bolus and a card-coloured gap where bolus sits on basal, they're 4.7:1 in light mode and 4.4:1 in dark.

Commits

The first two are the original Trends and Statistics-parity commits, rebased onto next-dev f7b08cad. The review changes follow, one commit per point so each can be reviewed on its own:

1. Replace Statistics with Trends
2. Move the day page, Gaps and Export to follow-up parts
3. Show each Trends figure once
4. Show targets beside their figures instead of Aim lines
5. Use Loop's existing colours in Trends
6. Read closed and open loop from stored settings
7. Follow the cache duration and mark partial older periods
8. Stack Trends rows at the largest text sizes
9. Remove the unused ValueTile
10. Fix issues found testing the review changes
11. Tighten dose boundaries and use a darker bolus colour
12. Keep unrecorded schedule history unknown in Trends (Codex review)
13. Keep chart labels readable at accessibility sizes (Codex review)

Screenshots

Annotated, with before and after where something was removed. From the loop simulator's demo data; its seeded boluses before 26 October have no manual/automatic flag, which is why much of the 14-day bolus shows as unknown.

Also: Current Setup still working, Boluses tile with unknown.

Testing

On the loop simulator (iOS 27.0, Pump and CGM Simulators, 90 days of history), on next-dev f7b08cad:

• 1, 7, 14, 30 and 90 days; previous and next; an older week from Apple Health; a week across the local/Health boundary; an empty period; light, dark and AX XXXL.
• Apple Health filling days before Loop's first local records, checked by removing early local records from a copy of the store.
• Settings → Trends → Done, and Current Setup still working.
• Codex follow-up: AX XXXL chart labels use fewer ticks with the end dates anchored inside the plot; card titles and subtitles stack.

Selected LoopTests: 457 run, 455 pass. The two failures are BolusEntryViewModelTests.testCarbEntryDateAndAbsorptionTimeString and …String2, which fail the same way on plain next-dev ("12:00 PM" against "12:00"). LoopHistoryMathTests covers the boundary, manual temp basal, GMI and classification rules. The Codex follow-up adds a real-SettingsStore regression for schedule start dates, missing profiles and the preceding setting; restoring the old queries reproduces 5 U instead of the correct 3 U. LoopDataManagerTests passes 28/28 and LoopHistoryMathTests passes 32/32. HealthKit-hosted DeviceDataManagerTests were not run.

Building next-dev currently needs #2652 (WatchApp still links G7SensorKit after #2645). It isn't part of this PR.

Strings. New keys have translations in Loop's languages; native-speaker review is welcome. Statistics' strings and those only the moved screens used are removed. Shared keys gain missing translations; existing translations are unchanged. JSON and format-placeholder checks pass.

Deferred to later parts

• Day page and Gaps, including stepping between days and the reasons Loop stopped running, as their own PR.
• Export (PDF and CSV report), as its own PR so the report gets its own review.
• Parts 2–6 will be restacked on this part once it settles; until then they still carry the pre-review Trends.

The series

#2621 is split into PRs in the order Pete suggested: statistics and Trends first, then the Logbook, then the home screen. Add carbs, the widget and Live Activity, and the appearance options follow as their own parts, and the day page with Gaps, and Export, now come as two more. Each part builds on the one before it and targets next-dev, so a PR shows the earlier parts' commits too. #2621 stays open as the combined reference until the series lands.

1. [1/8] Add a Trends screen that replaces Statistics #2637 Trends, opened from Settings, replacing Statistics
2. [2/6] Add a Logbook of the last 7 days #2638 Logbook, opened from Settings
3. [3/6] Add the Now home screen with Now, Trends, Logbook and Settings tabs #2639 Now home screen with Now, Trends, Logbook and Settings tabs, and the New Interface toggle
4. [4/6] Rebuild Add carbs around a live preview of the meal #2640 Redesigned Add carbs
5. [5/6] Restyle the widget, Dynamic Island and Live Activity for the new interface #2641 Widget, Dynamic Island and Live Activity
6. [6/6] Add Day and Night app icons and an appearance setting #2642 Day and Night app icons and the appearance setting
7. Trends day page and Gaps (to be opened)
8. Trends Export (to be opened)

Merging. With squash merges, each next PR needs a rebase onto next-dev once the previous one lands. I'll rebase each PR as the one before it merges.

Strings. Each part adds only its own catalogue entries, with their translations in Loop's languages. GitHub's line diff of Localizable.xcstrings can show deletions where Xcode's ordering interleaves new keys.

🤖 Generated with Claude Code

https://claude.ai/code/session_01QHnVP6NkV9kiyLRBAeMMt9