Ports 8digit/picpeak@ed7943b as a TOGGLE rather than a replacement. The
current per-action shape (one row per favourite/like/rating/comment) stays
the default for backward compat with any external scripts consuming the
export; the new pivot shape (one row per (photo, guest_identifier) with
boolean is_favorited/is_liked + star_rating + comment) is opt-in via a
?shape=pivot query param and a dropdown in the admin feedback page.
Pivot wins for "which guests engaged with which photos" analysis in
Sheets / Excel pivot tables. Long wins for engagement timeline analysis
and re-importing into another tool. Different products, both valid.
### Backend
- `feedbackService.exportEventFeedbackPivoted(eventId)`: new method.
LEFT-of-Map approach, pure JS pivot so PG / SQLite behave identically.
Key is `(filename, guest_identifier)` — anonymous guests with no
identifier get a synthetic per-row key so two anonymous comments on the
same photo don't collapse. Comments: most recent wins (history dropped
in exchange for "current state" semantics). Hidden-by-moderator rows
excluded — the pivot represents what we want to surface, not the raw
event log.
- `adminFeedback.js` export route: accepts `?shape=pivot|long` (default
`long`). CSV filename now carries the shape (e.g.
`feedback-pivot-{id}.csv`) so repeated exports don't overwrite.
- `convertToCSV` helper in `adminFeedback.js` gains the three escaping
improvements that 8digit's commit also shipped: booleans → `yes`/`no`,
null/undefined → empty, escape strings containing newlines (\n/\r) as
well as commas/quotes. Comments with line breaks were silently breaking
CSV row counts before this. Improvements are pure wins regardless of
shape; archives' own `convertToCSV` copy left untouched (separate
surface, no behaviour drift risk).
### Frontend
- `feedback.service.ts` `exportEventFeedback()` gains optional `shape`
parameter, default 'long'.
- `EventFeedbackPage.tsx`: new shape dropdown next to the CSV / JSON
buttons (defaults to 'long'). Selected shape flows through to the API
request AND the downloaded filename.
### i18n
3 new EN + DE entries (`feedback.exportShapeLabel`,
`feedback.exportShapeLong`, `feedback.exportShapePivot`).
### Notes
- Pivot shape is **per-guest current state**, not history. A guest who
rated a photo, then changed their mind and removed the rating, would
show the final state in the pivot but BOTH actions in the long form.
Acceptable trade-off: pivot users care about the snapshot, long users
want the trail.
- `latest_at` column in pivot gives a "most recent activity" timestamp
per row, useful for sorting/filtering recent engagement.
### Test plan
- [x] Backend syntax + TS check + lint clean (no new warnings; existing
`catch (error)` warning was pre-existing)
- [ ] Manual: feedback page → select Per-guest (pivot) → Export CSV →
verify one row per (filename, guest) with is_favorited='yes'/'no',
latest_at column populated
- [ ] Manual: long shape default still produces the same per-action
output as before (no regression for existing consumers)
- [ ] Manual: comment containing a newline → pivot CSV escapes correctly,
row count matches data length + 1 header
- [ ] Manual: archive a published event with feedback → archive's
`feedback_data.csv` still uses the long shape (archive surface
unchanged on purpose)
Paul Nothaft
fabd67aecd