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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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src/fenris/status.py
+2 -2
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@@ -35,9 +35,9 @@ from .init_system import (
# Freshness constants (§8.9, §8.2)
# ---------------------------------------------------------------------------
CADENCE_DEFAULT_S = 300 # 5 min
CADENCE_DEFAULT_S = 180 # 3 min
ACCURACY_SEC = 30
FRESH_THRESHOLD_S = 2 * CADENCE_DEFAULT_S + ACCURACY_SEC + 60 # 690 s
FRESH_THRESHOLD_S = 2 * CADENCE_DEFAULT_S + ACCURACY_SEC + 60 # 450 s
STALENESS_THRESHOLD_S = 48 * 3600 # 48 h