fix(projection): conditional label uses trigger_event_id, not parent_id

t-paliad-294 / m/paliad#126. knuth's #121 conditional-rendering
defaulted the "abhängig von <parent>" chip to the rule's parent_id
display name. For R.262(2) Erwiderung auf Vertraulichkeitsantrag the
parent_id resolves to the SoC (Klageerhebung), but the rule's real
semantic anchor is the opposing party's confidentiality application
(paliad.trigger_events id=25). The chip read "abhängig von
Klageerhebung", which is wrong.

Fix: when a rule has a non-NULL trigger_event_id, the engine stamps
ParentRuleCode / ParentRuleName / ParentRuleNameEN from the
trigger_events catalog row instead of from the parent_id chain. The
parent_id stays as the calc-time arithmetic anchor — only the user-
facing dependency identity shifts.

Generalises across every rule with a real trigger_event_id (2 rows
in the live corpus today: confidentiality_response and
translations_lodge — both relabel correctly).

Touches both surfaces in one shot: verfahrensablauf-core's chip
("abhängig von …") and shape-timeline's "Folgt aus …" footer both
read from ParentRule*, so no frontend change needed.

Tests: extend TestUIDeadline_IsConditional_UncertainAnchors with a
DE+EN string-pinning case for R.262(2) plus a generalisation guard
for translations_lodge. Negative guard asserts the chip no longer
leaks "Klageerhebung" / "Statement of Claim".

internal/services/deadline_rule_service.go

@@ -207,6 +207,44 @@ func (s *DeadlineRuleService) GetByIDs(ctx context.Context, ids []uuid.UUID) ([]
 	return rules, nil
 }
 
+// LoadTriggerEventsByIDs bulk-loads paliad.trigger_events rows for the
+// given id set, keyed by id. Returns nil, nil for an empty input set so
+// callers can blindly forward whatever they accumulated. Inactive rows
+// are included — the conditional-label resolution in fristenrechner.go
+// surfaces the trigger event's display name even when the catalog row
+// has been retired, which is preferable to silently falling back to
+// the (wrong) parent_id name.
+//
+// Used by FristenrechnerService.Calculate to redirect a conditional
+// rule's "abhängig von …" chip from parent_id to trigger_event_id —
+// the actual semantic anchor for rules whose data-model parent is the
+// proceeding root but whose real trigger sits in the trigger_events
+// catalog (e.g. R.262(2) Erwiderung auf Vertraulichkeitsantrag → the
+// opposing party's confidentiality application). See m/paliad#126.
+func (s *DeadlineRuleService) LoadTriggerEventsByIDs(ctx context.Context, ids []int64) (map[int64]models.TriggerEvent, error) {
+	if len(ids) == 0 {
+		return nil, nil
+	}
+	query, args, err := sqlx.In(
+		`SELECT id, code, name, name_de, description, is_active, created_at
+		   FROM paliad.trigger_events
+		  WHERE id IN (?)`, ids)
+	if err != nil {
+		return nil, fmt.Errorf("build trigger_events IN query: %w", err)
+	}
+	query = s.db.Rebind(query)
+
+	var rows []models.TriggerEvent
+	if err := s.db.SelectContext(ctx, &rows, query, args...); err != nil {
+		return nil, fmt.Errorf("load trigger_events by ids %v: %w", ids, err)
+	}
+	out := make(map[int64]models.TriggerEvent, len(rows))
+	for _, r := range rows {
+		out[r.ID] = r
+	}
+	return out, nil
+}
+
 // ListByTriggerEvent returns active rules scoped to a single trigger
 // event — the Pipeline-C surface added by Phase 3 Slice 3 (mig 085).
 // These rules carry proceeding_type_id IS NULL (event-rooted) and have

internal/services/fristenrechner.go

@@ -452,6 +452,36 @@ func (s *FristenrechnerService) Calculate(ctx context.Context, proceedingCode, t
 		ruleByID[r.ID] = r
 	}
 
+	// triggerEventByID powers the trigger-event override on the
+	// conditional-label chip (m/paliad#126 / t-paliad-294). When a
+	// rule carries a real paliad.trigger_events row, that catalog
+	// event — not the rule's parent_id — is the rule's actual
+	// semantic anchor. The override fires below when stamping
+	// ParentRule* on the wire so the chip reads e.g.
+	//   abhängig von Antrag auf Vertraulichkeit gegenüber der Öffentlichkeit
+	// for R.262(2) Erwiderung auf Vertraulichkeitsantrag — instead of
+	// the (misleading) parent_id-derived "abhängig von Klageerhebung".
+	//
+	// Bulk-loaded in one round-trip; trees in the live corpus carry at
+	// most a handful of trigger_event_id-bearing rules (2 today on
+	// upc.inf.cfi), so the IN(...) is small.
+	var triggerIDs []int64
+	seenTrigger := make(map[int64]struct{}, len(rules))
+	for _, r := range rules {
+		if r.TriggerEventID == nil {
+			continue
+		}
+		if _, ok := seenTrigger[*r.TriggerEventID]; ok {
+			continue
+		}
+		seenTrigger[*r.TriggerEventID] = struct{}{}
+		triggerIDs = append(triggerIDs, *r.TriggerEventID)
+	}
+	triggerEventByID, err := s.rules.LoadTriggerEventsByIDs(ctx, triggerIDs)
+	if err != nil {
+		return nil, fmt.Errorf("load trigger events for conditional labels: %w", err)
+	}
+
 	// Per-event-card overlays (t-paliad-265). Empty/nil maps are safe
 	// for membership tests; the engine reads them but doesn't mutate.
 	skipRules := opts.SkipRules
@@ -582,6 +612,30 @@ func (s *FristenrechnerService) Calculate(ctx context.Context, proceedingCode, t
 			}
 		}
 
+		// Trigger-event override on the user-facing dependency identity
+		// (m/paliad#126 / t-paliad-294). When a rule has a real
+		// trigger_event_id, that catalog event is the actual semantic
+		// anchor — not the parent_id node, which is only the calc-time
+		// arithmetic anchor. R.262(2) Erwiderung auf Vertraulichkeits-
+		// antrag is the canonical case: parent_id resolves to the SoC
+		// ("Klageerhebung"), but the real triggering event is the
+		// opposing party's confidentiality application. Generalises to
+		// any rule whose trigger_event_id is set (e.g. R.6(2)
+		// translations_lodge → judge-rapporteur's order).
+		//
+		// Only the user-facing wire fields shift; parentRule (and the
+		// parent_id chain that feeds parentIsCourtSet / the calc-time
+		// date arithmetic below) stays anchored on the rule tree —
+		// that's still the right calc semantic. parentRule is NOT
+		// reassigned here.
+		if r.TriggerEventID != nil {
+			if te, ok := triggerEventByID[*r.TriggerEventID]; ok {
+				d.ParentRuleCode = te.Code
+				d.ParentRuleName = te.NameDE
+				d.ParentRuleNameEN = te.Name
+			}
+		}
+
 		// Propagate court-set status from a parent rule whose date the
 		// court determines: if the anchor itself has no real date,
 		// nothing downstream can be computed either — UNLESS the user

internal/services/fristenrechner_test.go

@@ -507,15 +507,21 @@ func TestUIDeadline_IsConditional_UncertainAnchors(t *testing.T) {
 		wantParentCode string
 	}{
 		// Symptom A — backward-anchored on the court-set oral hearing.
-		// Pre-pass fix: order-of-evaluation no longer matters.
+		// Pre-pass fix: order-of-evaluation no longer matters. These
+		// rules have no trigger_event_id, so ParentRuleCode stays on
+		// the parent_id-derived value.
 		{"upc.inf.cfi.translation_request", true, "upc.inf.cfi.oral"},
 		{"upc.inf.cfi.interpreter_cost", true, "upc.inf.cfi.oral"},
-		// R.118(4) chain — parent=decision (court-set).
+		// R.118(4) chain — parent=decision (court-set). No trigger_event_id.
 		{"upc.inf.cfi.cons_orders", true, "upc.inf.cfi.decision"},
-		// Symptom B — optional + both anchored on SoC (trigger anchor).
-		{"upc.inf.cfi.confidentiality_response", true, "upc.inf.cfi.soc"},
+		// Symptom B — optional + both, data-model parent is SoC but the
+		// real trigger is the opposing party's confidentiality application.
+		// m/paliad#126 / t-paliad-294: ParentRuleCode now reflects the
+		// trigger_events catalog row (id=25), NOT the parent_id chain.
+		{"upc.inf.cfi.confidentiality_response", true, "application_to_request_confidentiality_from_the_public"},
 		// Negative control — mandatory rule anchored on SoC must keep
-		// its concrete date (no IsConditional, real DueDate).
+		// its concrete date (no IsConditional, real DueDate). No
+		// trigger_event_id, so parent_id-derived code stays.
 		{"upc.inf.cfi.sod", false, "upc.inf.cfi.soc"},
 	}
 
@@ -546,6 +552,52 @@ func TestUIDeadline_IsConditional_UncertainAnchors(t *testing.T) {
 		})
 	}
 
+	// m/paliad#126 / t-paliad-294: the conditional chip for R.262(2)
+	// reads from the trigger_events catalog (id=25), so the user sees
+	// the actual semantic anchor instead of the parent_id-derived
+	// "Klageerhebung". Pin the exact DE + EN strings so a future
+	// rename of the catalog row surfaces here.
+	t.Run("R.262(2) conditional label uses trigger_event_id, not parent_id", func(t *testing.T) {
+		d, ok := byCode["upc.inf.cfi.confidentiality_response"]
+		if !ok {
+			t.Fatalf("confidentiality_response missing from response")
+		}
+		const wantNameDE = "Antrag auf Vertraulichkeit gegenüber der Öffentlichkeit"
+		const wantNameEN = "Application to request confidentiality from the public"
+		if d.ParentRuleName != wantNameDE {
+			t.Errorf("ParentRuleName = %q, want %q (trigger_events.name_de for id=25)", d.ParentRuleName, wantNameDE)
+		}
+		if d.ParentRuleNameEN != wantNameEN {
+			t.Errorf("ParentRuleNameEN = %q, want %q (trigger_events.name for id=25)", d.ParentRuleNameEN, wantNameEN)
+		}
+		// Negative guard — neither label should leak the SoC ("Klageerhebung"),
+		// which is the regression the fix exists to prevent.
+		if d.ParentRuleName == "Klageerhebung" || d.ParentRuleNameEN == "Statement of Claim" {
+			t.Errorf("conditional label still resolves via parent_id (SoC); fix regressed")
+		}
+	})
+
+	// Generalisation guard — translations_lodge also carries a real
+	// trigger_event_id (113 = judge-rapporteur's order). Its
+	// conditional chip should reference the order, not its parent_id
+	// (Zwischenverfahren). Locks in the "any rule with trigger_event_id
+	// uses THAT, not parent_id" contract from m/paliad#126.
+	t.Run("translations_lodge conditional label uses trigger_event_id", func(t *testing.T) {
+		d, ok := byCode["upc.inf.cfi.translations_lodge"]
+		if !ok {
+			t.Skip("upc.inf.cfi.translations_lodge missing from response — data drift?")
+		}
+		if !d.IsConditional {
+			t.Skipf("translations_lodge IsConditional=false in current corpus; trigger-event override is only user-visible on conditional rows. Skip but keep the generalisation guard.")
+		}
+		if d.ParentRuleName == "Zwischenverfahren" {
+			t.Errorf("translations_lodge still labelled via parent_id (Zwischenverfahren); should follow trigger_event_id=113")
+		}
+		if d.ParentRuleCode != "order_of_the_judge_rapporteur_to_lodge_translations" {
+			t.Errorf("ParentRuleCode = %q, want trigger_events.code for id=113", d.ParentRuleCode)
+		}
+	})
+
 	// Override path: when the user anchors the oral hearing, the
 	// backward-anchored R.109(1) flips back to a concrete date and
 	// IsConditional clears. This is the click-to-edit unblock.