The current "Wochenende/Feiertag" / "weekend/holiday" label hides the cause
of long shifts — m's reproduction had a deadline jump from 4.8.2026 to
31.8.2026 (+27 calendar days) across UPC Summer Vacation, and the UI made
it look like a bug. The math was correct; the explanation was lying.
Backend:
- AdjustForNonWorkingDaysWithReason returns an AdjustmentReason alongside
the adjusted date. Walks the same 60-iter loop, classifies the dominant
cause (vacation > public_holiday > weekend), collects every named
holiday hit, and for vacations scans outward to report the contiguous
block boundary (27.7.–28.8., not the 25 individual rows).
- AdjustForNonWorkingDays now wraps the new method, preserving its
3-tuple signature for existing callers (deadline_calculator,
event_deadline_service).
- UIDeadline gains an AdjustmentReason field; FristenrechnerService
populates it on every shifted deadline.
- Date fields serialise as YYYY-MM-DD strings (HolidayDTO + string
vacation span) — the Fristenrechner client already speaks that format.
Frontend:
- AdjustmentReason → human-readable phrase via renderAdjustmentReason:
vacation → "{vacation_name} ({span})"
public_holiday → "Feiertag ({first_holiday_name})" / "{name} holiday"
weekend → "Wochenende" / localised weekday
- Surrounding format becomes "Verschoben wegen X: A → B" (DE) or
"Shifted (X): A → B" (EN). Falls back to the legacy reason string
when the backend hasn't sent a structured reason.
- Vacation names render verbatim from paliad.holidays — no hardcoded
i18n mapping for individual closures (those rotate via the seed, not
via i18n.ts).
Tests cover the three Kind paths plus the no-shift case; UPC vacation
test injects the migration-010 seed into the cache so the assertion
runs without a live DB.
Out of scope (raised in conversation, deferred):
- Whether "UPC Summer Vacation" / "UPC Winter Vacation" are the right
names for the seeded rows, and whether the winter block belongs in
paliad.holidays at all (m flagged this as BS while reviewing the
task — needs a data-side decision before renaming/removing).
- holidays.country isn't filtered by proceeding-type jurisdiction, so
UPC vacation currently shifts EP_GRANT / EPA_APP / German national
deadlines too. Bigger fix; flagged for a follow-up issue.
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