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Plot live drive activity every three minutes (#91)

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- Change default collection cadence from 5 minutes to 3 minutes
  (CADENCE_DEFAULT_S=180, systemd OnUnitInactiveSec=3min,
  runit CADENCE=180)
- Update freshness threshold to 450s (2×180 + AccuracySec + 60)
- Add _query_live_graph_data(): queries raw samples from the last
  3 hours and computes interval byte deltas with actual timestamps
- Add LiveActivityGraph widget: vertical bar chart of interval
  volumes with read/write toggle (w key), arrow key inspection,
  and click support
- Wire live graph into TUI layout (full-width row between daily
  graph and drive health), refresh cycle, and CSS grid
- Replace t theme binding with t today/live binding; theme
  selection via preferences file
- Add w binding for read/write toggle on live graph
- Update action legend, help screen, and grid layout for new
  live-activity row
- Add 20 tests covering cadence constants, live query, widget
  rendering, toggle, and TUI integration
- Update all cadence documentation (README, ADR 0003, acceptance
  criteria LC-2, fenris-redesign constants table, CHANGELOG)
This commit is contained in:
xavierk
2026-09-18 13:17:18 +05:30
parent 4f884b4b73
commit e12f4a574c
14 changed files with 735 additions and 70 deletions
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docs/spec/fenris-redesign.md
+2 -2
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@@ -16,7 +16,7 @@ Every constant is defined once, in the section named below; other sections cite,
| Constant | Value | Defined in |
|---|---|---|
| Collection cadence (default) | 5 min (`OnUnitInactiveSec`) | §8.2 |
| Collection cadence (default) | 3 min (`OnUnitInactiveSec`) | §8.2 |
| First-boot delay | 2 min (`OnBootSec`) | §8.2 |
| Timer accuracy window | 30 s (`AccuracySec`) | §8.2 |
| Collection-run timeout | 90 s (`TimeoutStartSec`) | §8.2 |
@@ -479,7 +479,7 @@ Two privileged binaries — `/usr/libexec/fenris/fenris-collect` (device interro
Constants defined once, consumed by TUI and CLI alike; the grade derives from the **newest sample timestamp**, never a stored flag:
- **fresh** — newest sample within 2 × cadence + `AccuracySec` + 60 s (11.5 min at default cadence);
- **fresh** — newest sample within 2 × cadence + `AccuracySec` + 60 s (7.5 min at default cadence);
- **missed** — between that and 48 h (a contributing fact);
- **stale** — ≥ 48 h, matching the §6.7 evidence gate;
- **empty store** — *"no observations yet"* with an enable hint.