PR-1 of the Fristen+Termine unification (t-paliad-110). Backend layer
only — no frontend changes; the existing /deadlines and /appointments
pages still render the type-specific UIs.
EventService delegates to DeadlineService + AppointmentService for the
actual reads (no duplicate visibility logic, no duplicate event_type
hydration), then projects both into the discriminated EventListItem
union and merges/sorts by event_date asc. The handler exposes:
GET /api/events?type=deadline|appointment|all&status=…&project_id=…
&event_type=…&type_filter=…&from=…&to=…
GET /api/events/summary?type=…&project_id=…
Bucket model (per t-paliad-110 spec, supersedes t-106):
- four universal cards: Heute · Diese Woche · Nächste Woche · Später
- Überfällig is deadline-only, conditional, alarm-styled when > 0
- Erledigt drops from the card row; stays available as a filter option
- appointments have no completed_at — past appointments aren't bucketed
The deadline-side cutoffs reuse computeDeadlineBucketBounds so
/api/events/summary and /api/deadlines/summary can never disagree.
Existing /api/deadlines and /api/appointments stay untouched —
calendars, project-detail panes, and CalDAV consumers still call them
directly.
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