Slice 1 of the SmartTimeline (Verlauf-tab redesign). Adds a new service
layer + two HTTP endpoints; no projection logic yet (Slice 2). The wire
shape (TimelineEvent) is frozen so future slices add Kind="projected"
rows additively without breaking the frontend consumer.
ProjectionService.For composes three actuals streams for one project:
- paliad.deadlines → Kind="deadline"
- paliad.appointments → Kind="appointment"
- paliad.project_events with
timeline_kind IS NOT NULL → Kind="milestone"
Visibility goes through the existing inline mirror of
paliad.can_see_project on each underlying service — no new RLS surface.
DirectOnly mirrors the existing "Inkl. Unterprojekte" toggle on
/projects/{id}; IncludeAuditFull broadens project_events to the full
audit log behind the upcoming "Audit-Log anzeigen" header toggle.
ProjectionService.RecordCustomMilestone backs POST /timeline/milestone
("Eigener Meilenstein") — the only write path in Slice 1.
Tests: unit (sort order, status mapping, kind tiebreak — runs by default)
plus a live integration test that seeds one project + dl + appt +
milestone and asserts the merge surfaces all three with the right
ordering. Live test gated on TEST_DATABASE_URL per the existing
convention.
Design ref: docs/design-smart-timeline-2026-05-08.md §2.3 + §9.2 + §10.
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