Repair the collection-to-display path so each successful acquisition
publishes correct read/write deltas through the observation store and
visible dashboard.
Fixes:
- derive.py: accumulate bytes_read_delta on same-hour hour_observation
merge (was silently dropped)
- collector.py: rebuild day_aggregates from hour observations after
each collection run (previously only populated for cross-hour intervals)
- day_aggregate.py: add persist_day_aggregate upsert helper
- tui.py: query and display both read and write deltas in daily and
hourly readouts, constrained summaries, and graph data queries
Tests:
- Add 14 integration tests (test_measured_activity.py) exercising the
full collector→store→reader→display path with real fixtures and
injected time
- Update constrained-layout assertion to match new W/R format
Closes#89
Hour classification (PR-4):
- Powered-off: POH delta < 90% of wall-clock span
- Active: DUW delta >= 256 MiB
- Idle: powered on + sampled + below active threshold
- Unknown: unsampled without POH evidence
- Four splits sum to exactly wall_clock_seconds
- Disabled time is never an hour state
Monitoring periods (FL-8):
- ensure_period_open: opens period at run moment if none exists
- close_period: closes with end cause
- is_inside_period: checks timestamp against period bounds
- Never backdated; wall-clock outside periods excluded from denominator
Day aggregates (ST-4, PR-5):
- Derived monotonically from hour rows
- UTC-bounded; no 23/25-hour days
- Coverage: known seconds / period wall-clock
- Gap hours inside periods contribute unknown seconds
- Hours outside periods excluded entirely
- No absent hour interpolated/estimated/fabricated (FL-3)
Raw sample pruning (ST-5):
- Prunes samples older than 14 days
- Hour observations and day aggregates retained indefinitely
Closes#22
xavierk