The design parked in the handoff (multi-tier stats off reading_history;
bookorbit-style in data, not looks) is in. The real prerequisite work
was data: reading_history existed but NOTHING wrote to it — the whole
stats feature was sitting on an empty table.
- CAPTURE (no client changes, no repo-boundary crossings): every
successful progress write through SaveProgress (KOReader + app + web
+ Kobo + offline queue — the one chokepoint) now records one
reading_history session row: span = the interval since the PREVIOUS
write instant, pages = positive page delta when both sides know the
page index, marker rows for first contact. Spans over 2h are kept as
zero-second markers (overnight suspend→resume, offline flushes must
not inflate totals) — the honest 'sync cadence, not a stopwatch'
caveat stays. device_id only when a REAL device row matches (the
web/app progress path historically stuffs the USER id into DeviceID
— probe instead of trusting it; FK violation would silently drop
every capture). Source preserved in device_metadata.
- API: /api/stats/summary?range=7|30|90|year (totals, zero-filled
daily arrays, streaks, most-active day/weekday, top books, library
breakdown — one call), /api/stats/this-week (widget: rolling 7d vs
previous + streak), /api/stats/books/:id (lifetime + recent
sessions). All bucketed in the user's timezone; finished ≡ any push
≥0.995; visible-library lens enforced at source. Legacy
/api/analytics/* kept untouched. Range windows anchor end-of-day to
the START of today (blasting the clock time into tomorrow resolved
'today' a calendar day late — found by the streak test).
- /stats page (sidebar Stats between Progress and Devices, previously
/analytics was an orphan): range selector, five stat cards, two
Chart.js v4 charts (daily minutes bar, pages/day line — chunked via
dynamic import so main.js stays untouched), per-library breakdown,
most-read list, empty-state explainer. /analytics now 301s to /stats.
The orphaned analytics.templ + analytics.ts removed (their containers
and the page JSON never matched; the page was astub).
- Dashboard 'This Week' widget (server-rendered, suppressed on service
failure) and the book detail 'Your Reading Stats' card (lifetime
totals of the viewer's own sessions) complete the tiers: per-user
default, per-library breakdown inline, per-book on the page,
per-system/admin aggregate parked as before.
Tests: statistics_test.go (capture semantics at the chokepoint,
tz/day buckets, zero-fill, streak math, finished detection, range
validation, auth gate, widget, per-book lifetime). Full suite PASS.
John O'Keefe
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