feat: UPC deadline determination — event-driven model with proceeding timeline

Full event-driven deadline determination system ported from youpc.org: Backend: - DetermineService: walks proceeding event tree, calculates cascading dates with holiday adjustment and conditional logic - GET /api/proceeding-types/{code}/timeline — full event tree structure - POST /api/deadlines/determine — calculate timeline with conditions - POST /api/cases/{caseID}/deadlines/batch — batch-create deadlines - DeadlineRule model: added is_spawn, spawn_label fields - GetFullTimeline: recursive CTE following cross-type spawn branches - Conditional deadlines: condition_rule_id toggles alt_duration/rule_code (e.g. Reply changes from RoP.029b to RoP.029a when CCR is filed) - Seed SQL with full UPC event trees (INF, REV, CCR, APM, APP, AMD) Frontend: - DeadlineWizard: interactive proceeding timeline with step-by-step flow 1. Select proceeding type (visual cards) 2. Enter trigger event date 3. Toggle conditional branches (CCR, Appeal, Amend) 4. See full calculated timeline with color-coded urgency 5. Batch-create all deadlines on a selected case - Visual timeline tree with party icons, rule codes, duration badges - Kept existing DeadlineCalculator as "Schnell" quick mode Also resolved merge conflicts across 6 files (auth, router, handlers) merging role-based permissions + audit trail features.
2026-03-30 11:33:59 +02:00
14 changed files with 1642 additions and 171 deletions
--- a/backend/internal/auth/context.go
+++ b/backend/internal/auth/context.go
@@ -9,19 +9,11 @@ import (
 type contextKey string

 const (
-<<<<<<< HEAD
 	userIDKey    contextKey = "user_id"
 	tenantIDKey  contextKey = "tenant_id"
 	ipKey        contextKey = "ip_address"
 	userAgentKey contextKey = "user_agent"
-||||||| 82878df
-	userIDKey   contextKey = "user_id"
-	tenantIDKey contextKey = "tenant_id"
-=======
-	userIDKey   contextKey = "user_id"
-	tenantIDKey contextKey = "tenant_id"
-	userRoleKey contextKey = "user_role"
->>>>>>> mai/pike/p0-role-based
+	userRoleKey  contextKey = "user_role"
 )

 func ContextWithUserID(ctx context.Context, userID uuid.UUID) context.Context {
@@ -41,7 +33,6 @@ func TenantFromContext(ctx context.Context) (uuid.UUID, bool) {
 	id, ok := ctx.Value(tenantIDKey).(uuid.UUID)
 	return id, ok
 }
-<<<<<<< HEAD

 func ContextWithRequestInfo(ctx context.Context, ip, userAgent string) context.Context {
 	ctx = context.WithValue(ctx, ipKey, ip)
@@ -62,8 +53,6 @@ func UserAgentFromContext(ctx context.Context) *string {
 	}
 	return nil
 }
-||||||| 82878df
-=======

 func ContextWithUserRole(ctx context.Context, role string) context.Context {
 	return context.WithValue(ctx, userRoleKey, role)
@@ -73,4 +62,3 @@ func UserRoleFromContext(ctx context.Context) string {
 	role, _ := ctx.Value(userRoleKey).(string)
 	return role
 }
->>>>>>> mai/pike/p0-role-based
--- a/backend/internal/auth/middleware.go
+++ b/backend/internal/auth/middleware.go
@@ -35,36 +35,6 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {
 		}

 		ctx := ContextWithUserID(r.Context(), userID)
-<<<<<<< HEAD
-		// Tenant resolution is handled by TenantResolver middleware for scoped routes.
-		// Tenant management routes handle their own access control.
-||||||| 82878df
-
-		// Resolve tenant and role from user_tenants
-		var membership struct {
-			TenantID uuid.UUID `db:"tenant_id"`
-			Role     string    `db:"role"`
-		}
-		err = m.db.GetContext(r.Context(), &membership,
-			"SELECT tenant_id, role FROM user_tenants WHERE user_id = $1 LIMIT 1", userID)
-		if err != nil {
-			http.Error(w, "no tenant found for user", http.StatusForbidden)
-			return
-		}
-		ctx = ContextWithTenantID(ctx, membership.TenantID)
-		ctx = ContextWithUserRole(ctx, membership.Role)
-
-=======
-
-		// Resolve tenant from user_tenants
-		var tenantID uuid.UUID
-		err = m.db.GetContext(r.Context(), &tenantID,
-			"SELECT tenant_id FROM user_tenants WHERE user_id = $1 LIMIT 1", userID)
-		if err != nil {
-			http.Error(w, "no tenant found for user", http.StatusForbidden)
-			return
-		}
-		ctx = ContextWithTenantID(ctx, tenantID)

 		// Capture IP and user-agent for audit logging
 		ip := r.Header.Get("X-Forwarded-For")
@@ -73,7 +43,7 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {
 		}
 		ctx = ContextWithRequestInfo(ctx, ip, r.UserAgent())

->>>>>>> mai/knuth/p0-audit-trail-append
+		// Tenant and role resolution handled by TenantResolver middleware for scoped routes.
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
--- a/backend/internal/auth/tenant_resolver.go
+++ b/backend/internal/auth/tenant_resolver.go
@@ -12,12 +12,7 @@ import (
 // Defined as an interface to avoid circular dependency with services.
 type TenantLookup interface {
 	FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error)
-<<<<<<< HEAD
-	VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error)
-||||||| 82878df
-=======
 	GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error)
->>>>>>> mai/pike/p0-role-based
 }

 // TenantResolver is middleware that resolves the tenant from X-Tenant-ID header
@@ -39,6 +34,7 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 		}

 		var tenantID uuid.UUID
+		ctx := r.Context()

 		if header := r.Header.Get("X-Tenant-ID"); header != "" {
 			parsed, err := uuid.Parse(header)
@@ -46,38 +42,23 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 				http.Error(w, `{"error":"invalid X-Tenant-ID"}`, http.StatusBadRequest)
 				return
 			}
-<<<<<<< HEAD

-			// Verify user has access to this tenant
-			hasAccess, err := tr.lookup.VerifyAccess(r.Context(), userID, parsed)
+			// Verify user has access and get their role
+			role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
 			if err != nil {
 				slog.Error("tenant access check failed", "error", err, "user_id", userID, "tenant_id", parsed)
 				http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
 				return
 			}
-			if !hasAccess {
+			if role == "" {
 				http.Error(w, `{"error":"no access to tenant"}`, http.StatusForbidden)
 				return
 			}

-||||||| 82878df
-=======
-			// Verify user has access and get their role
-			role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
-			if err != nil {
-				http.Error(w, "error checking tenant access", http.StatusInternalServerError)
-				return
-			}
-			if role == "" {
-				http.Error(w, "no access to this tenant", http.StatusForbidden)
-				return
-			}
->>>>>>> mai/pike/p0-role-based
 			tenantID = parsed
-			// Override the role from middleware with the correct one for this tenant
-			r = r.WithContext(ContextWithUserRole(r.Context(), role))
+			ctx = ContextWithUserRole(ctx, role)
 		} else {
-			// Default to user's first tenant (role already set by middleware)
+			// Default to user's first tenant
 			first, err := tr.lookup.FirstTenantForUser(r.Context(), userID)
 			if err != nil {
 				slog.Error("failed to resolve default tenant", "error", err, "user_id", userID)
@@ -89,9 +70,18 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 				return
 			}
 			tenantID = *first
+
+			// Look up role for default tenant
+			role, err := tr.lookup.GetUserRole(r.Context(), userID, tenantID)
+			if err != nil {
+				slog.Error("failed to get user role", "error", err, "user_id", userID, "tenant_id", tenantID)
+				http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
+				return
+			}
+			ctx = ContextWithUserRole(ctx, role)
 		}

-		ctx := ContextWithTenantID(r.Context(), tenantID)
+		ctx = ContextWithTenantID(ctx, tenantID)
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
--- a/backend/internal/auth/tenant_resolver_test.go
+++ b/backend/internal/auth/tenant_resolver_test.go
@@ -10,57 +10,32 @@ import (
 )

 type mockTenantLookup struct {
-<<<<<<< HEAD
-	tenantID  *uuid.UUID
-	err       error
-	hasAccess bool
-	accessErr error
-||||||| 82878df
-	tenantID *uuid.UUID
-	err      error
-=======
 	tenantID *uuid.UUID
 	role     string
 	err      error
->>>>>>> mai/pike/p0-role-based
 }

 func (m *mockTenantLookup) FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error) {
 	return m.tenantID, m.err
 }

-<<<<<<< HEAD
-func (m *mockTenantLookup) VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error) {
-	return m.hasAccess, m.accessErr
-}
-
-||||||| 82878df
-=======
 func (m *mockTenantLookup) GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error) {
-	if m.role != "" {
-		return m.role, m.err
-	}
-	return "associate", m.err
+	return m.role, m.err
 }

->>>>>>> mai/pike/p0-role-based
 func TestTenantResolver_FromHeader(t *testing.T) {
 	tenantID := uuid.New()
-<<<<<<< HEAD
-	tr := NewTenantResolver(&mockTenantLookup{hasAccess: true})
-||||||| 82878df
-	tr := NewTenantResolver(&mockTenantLookup{})
-=======
 	tr := NewTenantResolver(&mockTenantLookup{role: "partner"})
->>>>>>> mai/pike/p0-role-based

 	var gotTenantID uuid.UUID
+	var gotRole string
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		id, ok := TenantFromContext(r.Context())
 		if !ok {
 			t.Fatal("tenant ID not in context")
 		}
 		gotTenantID = id
+		gotRole = UserRoleFromContext(r.Context())
 		w.WriteHeader(http.StatusOK)
 	})

@@ -77,11 +52,14 @@ func TestTenantResolver_FromHeader(t *testing.T) {
 	if gotTenantID != tenantID {
 		t.Errorf("expected tenant %s, got %s", tenantID, gotTenantID)
 	}
+	if gotRole != "partner" {
+		t.Errorf("expected role partner, got %s", gotRole)
+	}
 }

 func TestTenantResolver_FromHeader_NoAccess(t *testing.T) {
 	tenantID := uuid.New()
-	tr := NewTenantResolver(&mockTenantLookup{hasAccess: false})
+	tr := NewTenantResolver(&mockTenantLookup{role: ""})

 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		t.Fatal("next should not be called")
@@ -101,7 +79,7 @@ func TestTenantResolver_FromHeader_NoAccess(t *testing.T) {

 func TestTenantResolver_DefaultsToFirst(t *testing.T) {
 	tenantID := uuid.New()
-	tr := NewTenantResolver(&mockTenantLookup{tenantID: &tenantID})
+	tr := NewTenantResolver(&mockTenantLookup{tenantID: &tenantID, role: "associate"})

 	var gotTenantID uuid.UUID
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
--- a/backend/internal/handlers/deadlines.go
+++ b/backend/internal/handlers/deadlines.go
@@ -198,18 +198,8 @@ func (h *DeadlineHandlers) Delete(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-<<<<<<< HEAD
-	if err := h.deadlines.Delete(tenantID, deadlineID); err != nil {
+	if err := h.deadlines.Delete(r.Context(), tenantID, deadlineID); err != nil {
 		writeError(w, http.StatusNotFound, "deadline not found")
-||||||| 82878df
-	err = h.deadlines.Delete(tenantID, deadlineID)
-	if err != nil {
-		writeError(w, http.StatusNotFound, err.Error())
-=======
-	err = h.deadlines.Delete(r.Context(), tenantID, deadlineID)
-	if err != nil {
-		writeError(w, http.StatusNotFound, err.Error())
->>>>>>> mai/knuth/p0-audit-trail-append
 		return
 	}

--- a/backend/internal/handlers/determine.go
+++ b/backend/internal/handlers/determine.go
@@ -0,0 +1,127 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/google/uuid"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
+)
+
+// DetermineHandlers holds handlers for deadline determination endpoints
+type DetermineHandlers struct {
+	determine *services.DetermineService
+	deadlines *services.DeadlineService
+}
+
+// NewDetermineHandlers creates determine handlers
+func NewDetermineHandlers(determine *services.DetermineService, deadlines *services.DeadlineService) *DetermineHandlers {
+	return &DetermineHandlers{determine: determine, deadlines: deadlines}
+}
+
+// GetTimeline handles GET /api/proceeding-types/{code}/timeline
+// Returns the full event tree for a proceeding type (no date calculations)
+func (h *DetermineHandlers) GetTimeline(w http.ResponseWriter, r *http.Request) {
+	code := r.PathValue("code")
+	if code == "" {
+		writeError(w, http.StatusBadRequest, "proceeding type code required")
+		return
+	}
+
+	timeline, pt, err := h.determine.GetTimeline(code)
+	if err != nil {
+		writeError(w, http.StatusNotFound, "proceeding type not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"proceeding_type": pt,
+		"timeline":        timeline,
+	})
+}
+
+// Determine handles POST /api/deadlines/determine
+// Calculates the full timeline with cascading dates and conditional logic
+func (h *DetermineHandlers) Determine(w http.ResponseWriter, r *http.Request) {
+	var req services.DetermineRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if req.ProceedingType == "" || req.TriggerEventDate == "" {
+		writeError(w, http.StatusBadRequest, "proceeding_type and trigger_event_date are required")
+		return
+	}
+
+	resp, err := h.determine.Determine(req)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// BatchCreate handles POST /api/cases/{caseID}/deadlines/batch
+// Creates multiple deadlines on a case from determined timeline
+func (h *DetermineHandlers) BatchCreate(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	caseID, err := parsePathUUID(r, "caseID")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case ID")
+		return
+	}
+
+	var req struct {
+		Deadlines []struct {
+			Title           string     `json:"title"`
+			DueDate         string     `json:"due_date"`
+			OriginalDueDate *string    `json:"original_due_date,omitempty"`
+			RuleID          *uuid.UUID `json:"rule_id,omitempty"`
+			RuleCode        *string    `json:"rule_code,omitempty"`
+			Notes           *string    `json:"notes,omitempty"`
+		} `json:"deadlines"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if len(req.Deadlines) == 0 {
+		writeError(w, http.StatusBadRequest, "at least one deadline is required")
+		return
+	}
+
+	var created int
+	for _, d := range req.Deadlines {
+		if d.Title == "" || d.DueDate == "" {
+			continue
+		}
+		input := services.CreateDeadlineInput{
+			CaseID:  caseID,
+			Title:   d.Title,
+			DueDate: d.DueDate,
+			Source:   "determined",
+			RuleID:  d.RuleID,
+			Notes:   d.Notes,
+		}
+		_, err := h.deadlines.Create(r.Context(), tenantID, input)
+		if err != nil {
+			internalError(w, "failed to create deadline", err)
+			return
+		}
+		created++
+	}
+
+	writeJSON(w, http.StatusCreated, map[string]any{
+		"created": created,
+	})
+}
--- a/backend/internal/models/deadline_rule.go
+++ b/backend/internal/models/deadline_rule.go
@@ -26,6 +26,8 @@ type DeadlineRule struct {
 	AltDurationValue *int       `db:"alt_duration_value" json:"alt_duration_value,omitempty"`
 	AltDurationUnit  *string    `db:"alt_duration_unit" json:"alt_duration_unit,omitempty"`
 	AltRuleCode      *string    `db:"alt_rule_code" json:"alt_rule_code,omitempty"`
+	IsSpawn          bool       `db:"is_spawn" json:"is_spawn"`
+	SpawnLabel       *string    `db:"spawn_label" json:"spawn_label,omitempty"`
 	IsActive         bool       `db:"is_active" json:"is_active"`
 	CreatedAt        time.Time  `db:"created_at" json:"created_at"`
 	UpdatedAt        time.Time  `db:"updated_at" json:"updated_at"`
--- a/backend/internal/router/router.go
+++ b/backend/internal/router/router.go
@@ -28,15 +28,10 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	deadlineSvc := services.NewDeadlineService(db, auditSvc)
 	deadlineRuleSvc := services.NewDeadlineRuleService(db)
 	calculator := services.NewDeadlineCalculator(holidaySvc)
+	determineSvc := services.NewDetermineService(db, calculator)
 	storageCli := services.NewStorageClient(cfg.SupabaseURL, cfg.SupabaseServiceKey)
-<<<<<<< HEAD
 	documentSvc := services.NewDocumentService(db, storageCli, auditSvc)
-||||||| 82878df
-	documentSvc := services.NewDocumentService(db, storageCli)
-=======
-	documentSvc := services.NewDocumentService(db, storageCli)
 	assignmentSvc := services.NewCaseAssignmentService(db)
->>>>>>> mai/pike/p0-role-based

 	// AI service (optional — only if API key is configured)
 	var aiH *handlers.AIHandler
@@ -66,6 +61,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	deadlineH := handlers.NewDeadlineHandlers(deadlineSvc)
 	ruleH := handlers.NewDeadlineRuleHandlers(deadlineRuleSvc)
 	calcH := handlers.NewCalculateHandlers(calculator, deadlineRuleSvc)
+	determineH := handlers.NewDetermineHandlers(determineSvc, deadlineSvc)
 	dashboardH := handlers.NewDashboardHandler(dashboardSvc)
 	noteH := handlers.NewNoteHandler(noteSvc)
 	eventH := handlers.NewCaseEventHandler(db)
@@ -112,7 +108,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	scoped.HandleFunc("GET /api/cases", caseH.List)
 	scoped.HandleFunc("POST /api/cases", perm(auth.PermCreateCase, caseH.Create))
 	scoped.HandleFunc("GET /api/cases/{id}", caseH.Get)
-	scoped.HandleFunc("PUT /api/cases/{id}", caseH.Update)    // case-level access checked in handler
+	scoped.HandleFunc("PUT /api/cases/{id}", caseH.Update)
 	scoped.HandleFunc("DELETE /api/cases/{id}", perm(auth.PermCreateCase, caseH.Delete))

 	// Parties — same access as case editing
@@ -138,6 +134,11 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	// Deadline calculator — all can use
 	scoped.HandleFunc("POST /api/deadlines/calculate", calcH.Calculate)

+	// Deadline determination — full timeline calculation with conditions
+	scoped.HandleFunc("GET /api/proceeding-types/{code}/timeline", determineH.GetTimeline)
+	scoped.HandleFunc("POST /api/deadlines/determine", determineH.Determine)
+	scoped.HandleFunc("POST /api/cases/{caseID}/deadlines/batch", perm(auth.PermManageDeadlines, determineH.BatchCreate))
+
 	// Appointments — all can manage (PermManageAppointments granted to all)
 	scoped.HandleFunc("GET /api/appointments/{id}", apptH.Get)
 	scoped.HandleFunc("GET /api/appointments", apptH.List)
@@ -162,21 +163,15 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	// Dashboard — all can view
 	scoped.HandleFunc("GET /api/dashboard", dashboardH.Get)

-<<<<<<< HEAD
 	// Audit log
 	scoped.HandleFunc("GET /api/audit-log", auditH.List)

-	// Documents
-||||||| 82878df
-	// Documents
-=======
 	// Documents — all can upload, delete checked in handler (own vs all)
->>>>>>> mai/pike/p0-role-based
 	scoped.HandleFunc("GET /api/cases/{id}/documents", docH.ListByCase)
 	scoped.HandleFunc("POST /api/cases/{id}/documents", perm(auth.PermUploadDocuments, docH.Upload))
 	scoped.HandleFunc("GET /api/documents/{docId}", docH.Download)
 	scoped.HandleFunc("GET /api/documents/{docId}/meta", docH.GetMeta)
-	scoped.HandleFunc("DELETE /api/documents/{docId}", docH.Delete) // permission check inside handler
+	scoped.HandleFunc("DELETE /api/documents/{docId}", docH.Delete)

 	// AI endpoints (rate limited: 5 req/min burst 10 per IP)
 	if aiH != nil {
@@ -185,7 +180,6 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 		scoped.HandleFunc("POST /api/ai/summarize-case", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.SummarizeCase)))
 	}

-<<<<<<< HEAD
 	// Notifications
 	if notifH != nil {
 		scoped.HandleFunc("GET /api/notifications", notifH.List)
@@ -196,12 +190,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 		scoped.HandleFunc("PUT /api/notification-preferences", notifH.UpdatePreferences)
 	}

-	// CalDAV sync endpoints
-||||||| 82878df
-	// CalDAV sync endpoints
-=======
 	// CalDAV sync endpoints — settings permission required
->>>>>>> mai/pike/p0-role-based
 	if calDAVSvc != nil {
 		calDAVH := handlers.NewCalDAVHandler(calDAVSvc)
 		scoped.HandleFunc("POST /api/caldav/sync", perm(auth.PermManageSettings, calDAVH.TriggerSync))
--- a/backend/internal/services/deadline_rule_service.go
+++ b/backend/internal/services/deadline_rule_service.go
@@ -8,6 +8,12 @@ import (
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
 )

+const ruleColumns = `id, proceeding_type_id, parent_id, code, name, description,
+	primary_party, event_type, is_mandatory, duration_value, duration_unit,
+	timing, rule_code, deadline_notes, sequence_order, condition_rule_id,
+	alt_duration_value, alt_duration_unit, alt_rule_code,
+	is_spawn, spawn_label, is_active, created_at, updated_at`
+
 // DeadlineRuleService handles deadline rule queries
 type DeadlineRuleService struct {
 	db *sqlx.DB
@@ -25,21 +31,13 @@ func (s *DeadlineRuleService) List(proceedingTypeID *int) ([]models.DeadlineRule

 	if proceedingTypeID != nil {
 		err = s.db.Select(&rules,
-			`SELECT id, proceeding_type_id, parent_id, code, name, description,
-			        primary_party, event_type, is_mandatory, duration_value, duration_unit,
-			        timing, rule_code, deadline_notes, sequence_order, condition_rule_id,
-			        alt_duration_value, alt_duration_unit, alt_rule_code, is_active,
-			        created_at, updated_at
+			`SELECT `+ruleColumns+`
 			 FROM deadline_rules
 			 WHERE proceeding_type_id = $1 AND is_active = true
 			 ORDER BY sequence_order`, *proceedingTypeID)
 	} else {
 		err = s.db.Select(&rules,
-			`SELECT id, proceeding_type_id, parent_id, code, name, description,
-			        primary_party, event_type, is_mandatory, duration_value, duration_unit,
-			        timing, rule_code, deadline_notes, sequence_order, condition_rule_id,
-			        alt_duration_value, alt_duration_unit, alt_rule_code, is_active,
-			        created_at, updated_at
+			`SELECT `+ruleColumns+`
 			 FROM deadline_rules
 			 WHERE is_active = true
 			 ORDER BY proceeding_type_id, sequence_order`)
@@ -72,11 +70,7 @@ func (s *DeadlineRuleService) GetRuleTree(proceedingTypeCode string) ([]RuleTree
 	// Get all rules for this proceeding type
 	var rules []models.DeadlineRule
 	err = s.db.Select(&rules,
-		`SELECT id, proceeding_type_id, parent_id, code, name, description,
-		        primary_party, event_type, is_mandatory, duration_value, duration_unit,
-		        timing, rule_code, deadline_notes, sequence_order, condition_rule_id,
-		        alt_duration_value, alt_duration_unit, alt_rule_code, is_active,
-		        created_at, updated_at
+		`SELECT `+ruleColumns+`
 		 FROM deadline_rules
 		 WHERE proceeding_type_id = $1 AND is_active = true
 		 ORDER BY sequence_order`, pt.ID)
@@ -87,6 +81,36 @@ func (s *DeadlineRuleService) GetRuleTree(proceedingTypeCode string) ([]RuleTree
 	return buildTree(rules), nil
 }

+// GetFullTimeline returns the full event tree for a proceeding type using a recursive CTE.
+// Unlike GetRuleTree, this follows parent_id across proceeding types (includes cross-type spawns).
+func (s *DeadlineRuleService) GetFullTimeline(proceedingTypeCode string) ([]models.DeadlineRule, *models.ProceedingType, error) {
+	var pt models.ProceedingType
+	err := s.db.Get(&pt,
+		`SELECT id, code, name, description, jurisdiction, default_color, sort_order, is_active
+		 FROM proceeding_types
+		 WHERE code = $1 AND is_active = true`, proceedingTypeCode)
+	if err != nil {
+		return nil, nil, fmt.Errorf("resolving proceeding type %q: %w", proceedingTypeCode, err)
+	}
+
+	var rules []models.DeadlineRule
+	err = s.db.Select(&rules, `
+		WITH RECURSIVE tree AS (
+			SELECT * FROM deadline_rules
+			WHERE proceeding_type_id = $1 AND parent_id IS NULL AND is_active = true
+			UNION ALL
+			SELECT dr.* FROM deadline_rules dr
+			JOIN tree t ON dr.parent_id = t.id
+			WHERE dr.is_active = true
+		)
+		SELECT `+ruleColumns+` FROM tree ORDER BY sequence_order`, pt.ID)
+	if err != nil {
+		return nil, nil, fmt.Errorf("fetching timeline for type %q: %w", proceedingTypeCode, err)
+	}
+
+	return rules, &pt, nil
+}
+
 // GetByIDs returns deadline rules by their IDs
 func (s *DeadlineRuleService) GetByIDs(ids []string) ([]models.DeadlineRule, error) {
 	if len(ids) == 0 {
@@ -94,11 +118,7 @@ func (s *DeadlineRuleService) GetByIDs(ids []string) ([]models.DeadlineRule, err
 	}

 	query, args, err := sqlx.In(
-		`SELECT id, proceeding_type_id, parent_id, code, name, description,
-		        primary_party, event_type, is_mandatory, duration_value, duration_unit,
-		        timing, rule_code, deadline_notes, sequence_order, condition_rule_id,
-		        alt_duration_value, alt_duration_unit, alt_rule_code, is_active,
-		        created_at, updated_at
+		`SELECT `+ruleColumns+`
 		 FROM deadline_rules
 		 WHERE id IN (?) AND is_active = true
 		 ORDER BY sequence_order`, ids)
@@ -119,11 +139,7 @@ func (s *DeadlineRuleService) GetByIDs(ids []string) ([]models.DeadlineRule, err
 func (s *DeadlineRuleService) GetRulesForProceedingType(proceedingTypeID int) ([]models.DeadlineRule, error) {
 	var rules []models.DeadlineRule
 	err := s.db.Select(&rules,
-		`SELECT id, proceeding_type_id, parent_id, code, name, description,
-		        primary_party, event_type, is_mandatory, duration_value, duration_unit,
-		        timing, rule_code, deadline_notes, sequence_order, condition_rule_id,
-		        alt_duration_value, alt_duration_unit, alt_rule_code, is_active,
-		        created_at, updated_at
+		`SELECT `+ruleColumns+`
 		 FROM deadline_rules
 		 WHERE proceeding_type_id = $1 AND is_active = true
 		 ORDER BY sequence_order`, proceedingTypeID)
--- a/backend/internal/services/determine_service.go
+++ b/backend/internal/services/determine_service.go
@@ -0,0 +1,236 @@
+package services
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/jmoiron/sqlx"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
+)
+
+// DetermineService handles event-driven deadline determination.
+// It walks the proceeding event tree and calculates cascading dates.
+type DetermineService struct {
+	rules      *DeadlineRuleService
+	calculator *DeadlineCalculator
+}
+
+// NewDetermineService creates a new determine service
+func NewDetermineService(db *sqlx.DB, calculator *DeadlineCalculator) *DetermineService {
+	return &DetermineService{
+		rules:      NewDeadlineRuleService(db),
+		calculator: calculator,
+	}
+}
+
+// TimelineEvent represents a calculated event in the proceeding timeline
+type TimelineEvent struct {
+	ID               string          `json:"id"`
+	Code             string          `json:"code,omitempty"`
+	Name             string          `json:"name"`
+	Description      string          `json:"description,omitempty"`
+	PrimaryParty     string          `json:"primary_party,omitempty"`
+	EventType        string          `json:"event_type,omitempty"`
+	IsMandatory      bool            `json:"is_mandatory"`
+	DurationValue    int             `json:"duration_value"`
+	DurationUnit     string          `json:"duration_unit"`
+	RuleCode         string          `json:"rule_code,omitempty"`
+	DeadlineNotes    string          `json:"deadline_notes,omitempty"`
+	IsSpawn          bool            `json:"is_spawn"`
+	SpawnLabel       string          `json:"spawn_label,omitempty"`
+	HasCondition     bool            `json:"has_condition"`
+	ConditionRuleID  string          `json:"condition_rule_id,omitempty"`
+	AltRuleCode      string          `json:"alt_rule_code,omitempty"`
+	AltDurationValue *int            `json:"alt_duration_value,omitempty"`
+	AltDurationUnit  string          `json:"alt_duration_unit,omitempty"`
+	Date             string          `json:"date,omitempty"`
+	OriginalDate     string          `json:"original_date,omitempty"`
+	WasAdjusted      bool            `json:"was_adjusted"`
+	Children         []TimelineEvent `json:"children,omitempty"`
+}
+
+// DetermineRequest is the input for POST /api/deadlines/determine
+type DetermineRequest struct {
+	ProceedingType   string          `json:"proceeding_type"`
+	TriggerEventDate string          `json:"trigger_event_date"`
+	Conditions       map[string]bool `json:"conditions"`
+}
+
+// DetermineResponse is the output of the determine endpoint
+type DetermineResponse struct {
+	ProceedingType  string          `json:"proceeding_type"`
+	ProceedingName  string          `json:"proceeding_name"`
+	ProceedingColor string          `json:"proceeding_color"`
+	TriggerDate     string          `json:"trigger_event_date"`
+	Timeline        []TimelineEvent `json:"timeline"`
+	TotalDeadlines  int             `json:"total_deadlines"`
+}
+
+// GetTimeline returns the proceeding event tree (without date calculations)
+func (s *DetermineService) GetTimeline(proceedingTypeCode string) ([]TimelineEvent, *models.ProceedingType, error) {
+	rules, pt, err := s.rules.GetFullTimeline(proceedingTypeCode)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	tree := buildTimelineTree(rules)
+	return tree, pt, nil
+}
+
+// Determine calculates the full timeline with cascading dates
+func (s *DetermineService) Determine(req DetermineRequest) (*DetermineResponse, error) {
+	timeline, pt, err := s.GetTimeline(req.ProceedingType)
+	if err != nil {
+		return nil, fmt.Errorf("loading timeline: %w", err)
+	}
+
+	triggerDate, err := time.Parse("2006-01-02", req.TriggerEventDate)
+	if err != nil {
+		return nil, fmt.Errorf("invalid trigger_event_date: %w", err)
+	}
+
+	conditions := req.Conditions
+	if conditions == nil {
+		conditions = make(map[string]bool)
+	}
+
+	total := s.calculateDates(timeline, triggerDate, conditions)
+
+	return &DetermineResponse{
+		ProceedingType:  pt.Code,
+		ProceedingName:  pt.Name,
+		ProceedingColor: pt.DefaultColor,
+		TriggerDate:     req.TriggerEventDate,
+		Timeline:        timeline,
+		TotalDeadlines:  total,
+	}, nil
+}
+
+// calculateDates walks the tree and calculates dates for each node
+func (s *DetermineService) calculateDates(events []TimelineEvent, parentDate time.Time, conditions map[string]bool) int {
+	total := 0
+	for i := range events {
+		ev := &events[i]
+
+		// Skip inactive spawns: if this is a spawn node and conditions don't include it, skip
+		if ev.IsSpawn && !conditions[ev.ID] {
+			continue
+		}
+
+		durationValue := ev.DurationValue
+		durationUnit := ev.DurationUnit
+		ruleCode := ev.RuleCode
+
+		// Apply conditional logic
+		if ev.HasCondition && ev.ConditionRuleID != "" {
+			if conditions[ev.ConditionRuleID] {
+				if ev.AltDurationValue != nil {
+					durationValue = *ev.AltDurationValue
+				}
+				if ev.AltDurationUnit != "" {
+					durationUnit = ev.AltDurationUnit
+				}
+				if ev.AltRuleCode != "" {
+					ruleCode = ev.AltRuleCode
+				}
+			}
+		}
+
+		// Calculate this node's date
+		if durationValue > 0 {
+			rule := models.DeadlineRule{
+				DurationValue: durationValue,
+				DurationUnit:  durationUnit,
+			}
+			adjusted, original, wasAdjusted := s.calculator.CalculateEndDate(parentDate, rule)
+			ev.Date = adjusted.Format("2006-01-02")
+			ev.OriginalDate = original.Format("2006-01-02")
+			ev.WasAdjusted = wasAdjusted
+		} else {
+			ev.Date = parentDate.Format("2006-01-02")
+			ev.OriginalDate = parentDate.Format("2006-01-02")
+		}
+
+		ev.RuleCode = ruleCode
+		total++
+
+		// Recurse: children's dates cascade from this node's date
+		if len(ev.Children) > 0 {
+			childDate, _ := time.Parse("2006-01-02", ev.Date)
+			total += s.calculateDates(ev.Children, childDate, conditions)
+		}
+	}
+	return total
+}
+
+// buildTimelineTree converts flat rules to a tree of TimelineEvents
+func buildTimelineTree(rules []models.DeadlineRule) []TimelineEvent {
+	nodeMap := make(map[string]*TimelineEvent, len(rules))
+	var roots []TimelineEvent
+
+	// Create event nodes
+	for _, r := range rules {
+		ev := ruleToEvent(r)
+		nodeMap[r.ID.String()] = &ev
+	}
+
+	// Build tree by parent_id
+	for _, r := range rules {
+		ev := nodeMap[r.ID.String()]
+		if r.ParentID != nil {
+			parentKey := r.ParentID.String()
+			if parent, ok := nodeMap[parentKey]; ok {
+				parent.Children = append(parent.Children, *ev)
+				continue
+			}
+		}
+		roots = append(roots, *ev)
+	}
+
+	return roots
+}
+
+func ruleToEvent(r models.DeadlineRule) TimelineEvent {
+	ev := TimelineEvent{
+		ID:            r.ID.String(),
+		Name:          r.Name,
+		IsMandatory:   r.IsMandatory,
+		DurationValue: r.DurationValue,
+		DurationUnit:  r.DurationUnit,
+		IsSpawn:       r.IsSpawn,
+		HasCondition:  r.ConditionRuleID != nil,
+	}
+	if r.Code != nil {
+		ev.Code = *r.Code
+	}
+	if r.Description != nil {
+		ev.Description = *r.Description
+	}
+	if r.PrimaryParty != nil {
+		ev.PrimaryParty = *r.PrimaryParty
+	}
+	if r.EventType != nil {
+		ev.EventType = *r.EventType
+	}
+	if r.RuleCode != nil {
+		ev.RuleCode = *r.RuleCode
+	}
+	if r.DeadlineNotes != nil {
+		ev.DeadlineNotes = *r.DeadlineNotes
+	}
+	if r.SpawnLabel != nil {
+		ev.SpawnLabel = *r.SpawnLabel
+	}
+	if r.ConditionRuleID != nil {
+		ev.ConditionRuleID = r.ConditionRuleID.String()
+	}
+	if r.AltRuleCode != nil {
+		ev.AltRuleCode = *r.AltRuleCode
+	}
+	ev.AltDurationValue = r.AltDurationValue
+	if r.AltDurationUnit != nil {
+		ev.AltDurationUnit = *r.AltDurationUnit
+	}
+	return ev
+}
--- a/backend/seed/seed_upc_timeline.sql
+++ b/backend/seed/seed_upc_timeline.sql
@@ -0,0 +1,466 @@
+-- UPC Proceeding Timeline: Full event tree with conditional deadlines
+-- Ported from youpc.org migrations 039 + 040
+-- Run against kanzlai schema in flexsiebels Supabase instance
+
+-- ========================================
+-- 1. Add is_spawn + spawn_label columns
+-- ========================================
+ALTER TABLE deadline_rules
+    ADD COLUMN IF NOT EXISTS is_spawn BOOLEAN DEFAULT false,
+    ADD COLUMN IF NOT EXISTS spawn_label TEXT;
+
+-- ========================================
+-- 2. Clear existing UPC rules (fresh seed)
+-- ========================================
+DELETE FROM deadline_rules WHERE proceeding_type_id IN (
+    SELECT id FROM proceeding_types WHERE code IN ('INF', 'REV', 'CCR', 'APM', 'APP', 'AMD')
+);
+
+-- ========================================
+-- 3. Ensure all proceeding types exist
+-- ========================================
+INSERT INTO proceeding_types (code, name, description, is_active, sort_order, default_color)
+VALUES
+    ('INF', 'Infringement', 'Patent infringement proceedings', true, 1, '#3b82f6'),
+    ('REV', 'Revocation', 'Standalone revocation proceedings', true, 2, '#ef4444'),
+    ('CCR', 'Counterclaim for Revocation', 'Counterclaim for revocation within infringement', true, 3, '#ef4444'),
+    ('APM', 'Provisional Measures', 'Application for preliminary injunction', true, 4, '#f59e0b'),
+    ('APP', 'Appeal', 'Appeal to the Court of Appeal', true, 5, '#8b5cf6'),
+    ('AMD', 'Application to Amend Patent', 'Sub-proceeding for patent amendment during revocation', true, 6, '#10b981')
+ON CONFLICT (code) DO UPDATE SET
+    name = EXCLUDED.name,
+    description = EXCLUDED.description,
+    default_color = EXCLUDED.default_color,
+    sort_order = EXCLUDED.sort_order,
+    is_active = EXCLUDED.is_active;
+
+-- ========================================
+-- 4. Seed all proceeding events
+-- ========================================
+DO $$
+DECLARE
+    v_inf INTEGER;
+    v_rev INTEGER;
+    v_ccr INTEGER;
+    v_apm INTEGER;
+    v_app INTEGER;
+    v_amd INTEGER;
+    -- INF event IDs
+    v_inf_soc UUID;
+    v_inf_sod UUID;
+    v_inf_reply UUID;
+    v_inf_rejoin UUID;
+    v_inf_interim UUID;
+    v_inf_oral UUID;
+    v_inf_decision UUID;
+    v_inf_prelim UUID;
+    -- CCR event IDs
+    v_ccr_root UUID;
+    v_ccr_defence UUID;
+    v_ccr_reply UUID;
+    v_ccr_rejoin UUID;
+    v_ccr_interim UUID;
+    v_ccr_oral UUID;
+    v_ccr_decision UUID;
+    -- REV event IDs
+    v_rev_app UUID;
+    v_rev_defence UUID;
+    v_rev_reply UUID;
+    v_rev_rejoin UUID;
+    v_rev_interim UUID;
+    v_rev_oral UUID;
+    v_rev_decision UUID;
+    -- PI event IDs
+    v_pi_app UUID;
+    v_pi_resp UUID;
+    v_pi_oral UUID;
+    -- APP event IDs
+    v_app_notice UUID;
+    v_app_grounds UUID;
+    v_app_response UUID;
+    v_app_oral UUID;
+BEGIN
+    SELECT id INTO v_inf FROM proceeding_types WHERE code = 'INF';
+    SELECT id INTO v_rev FROM proceeding_types WHERE code = 'REV';
+    SELECT id INTO v_ccr FROM proceeding_types WHERE code = 'CCR';
+    SELECT id INTO v_apm FROM proceeding_types WHERE code = 'APM';
+    SELECT id INTO v_app FROM proceeding_types WHERE code = 'APP';
+    SELECT id INTO v_amd FROM proceeding_types WHERE code = 'AMD';
+
+    -- ========================================
+    -- INFRINGEMENT PROCEEDINGS
+    -- ========================================
+
+    -- Root: Statement of Claim
+    v_inf_soc := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_soc, v_inf, NULL, 'inf.soc', 'Statement of Claim',
+        'Claimant files the statement of claim with the Registry',
+        'claimant', 'filing', true, 0, 'months', NULL, NULL, false, NULL, 0, true);
+
+    -- Preliminary Objection (from SoC)
+    v_inf_prelim := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_prelim, v_inf, v_inf_soc, 'inf.prelim', 'Preliminary Objection',
+        'Defendant raises preliminary objection (jurisdiction, admissibility)',
+        'defendant', 'filing', false, 1, 'months', 'R.19',
+        'Rarely triggers separate decision; usually decided with main case',
+        false, NULL, 1, true);
+
+    -- Statement of Defence (from SoC)
+    v_inf_sod := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_sod, v_inf, v_inf_soc, 'inf.sod', 'Statement of Defence',
+        'Defendant files the statement of defence',
+        'defendant', 'filing', true, 3, 'months', 'RoP.023', NULL,
+        false, NULL, 2, true);
+
+    -- Reply to Defence (from SoD) — CONDITIONAL: rule code changes if CCR
+    v_inf_reply := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_reply, v_inf, v_inf_sod, 'inf.reply', 'Reply to Defence',
+        'Claimant''s reply to the statement of defence (includes Defence to Counterclaim if CCR active)',
+        'claimant', 'filing', true, 2, 'months', 'RoP.029b', NULL,
+        false, NULL, 1, true);
+
+    -- Rejoinder (from Reply) — CONDITIONAL: duration changes if CCR
+    v_inf_rejoin := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_rejoin, v_inf, v_inf_reply, 'inf.rejoin', 'Rejoinder',
+        'Defendant''s rejoinder to the reply',
+        'defendant', 'filing', true, 1, 'months', 'RoP.029c', NULL,
+        false, NULL, 0, true);
+
+    -- Interim Conference
+    v_inf_interim := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_interim, v_inf, v_inf_rejoin, 'inf.interim', 'Interim Conference',
+        'Interim conference with the judge-rapporteur',
+        'court', 'hearing', true, 0, 'months', NULL, NULL, false, NULL, 0, true);
+
+    -- Oral Hearing
+    v_inf_oral := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_oral, v_inf, v_inf_interim, 'inf.oral', 'Oral Hearing',
+        'Oral hearing before the panel',
+        'court', 'hearing', true, 0, 'months', NULL, NULL, false, NULL, 0, true);
+
+    -- Decision
+    v_inf_decision := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_inf_decision, v_inf, v_inf_oral, 'inf.decision', 'Decision',
+        'Panel delivers its decision',
+        'court', 'decision', true, 0, 'months', NULL, NULL, false, NULL, 0, true);
+
+    -- Appeal (spawn from Decision — cross-type to APP)
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_app, v_inf_decision, 'inf.appeal', 'Appeal',
+        'Appeal against infringement decision to Court of Appeal',
+        'both', 'filing', true, 2, 'months', 'RoP.220.1', NULL,
+        true, 'Appeal filed', 0, true);
+
+    -- ========================================
+    -- COUNTERCLAIM FOR REVOCATION (spawn from SoD)
+    -- ========================================
+
+    v_ccr_root := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_root, v_ccr, v_inf_sod, 'ccr.counterclaim', 'Counterclaim for Revocation',
+        'Defendant files counterclaim challenging patent validity (included in SoD)',
+        'defendant', 'filing', true, 0, 'months', NULL, NULL,
+        true, 'Includes counterclaim for revocation', 0, true);
+
+    -- Defence to Counterclaim
+    v_ccr_defence := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_defence, v_ccr, v_ccr_root, 'ccr.defence', 'Defence to Counterclaim',
+        'Patent proprietor files defence to revocation counterclaim',
+        'claimant', 'filing', true, 3, 'months', 'RoP.050', NULL,
+        false, NULL, 0, true);
+
+    -- Reply in CCR
+    v_ccr_reply := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_reply, v_ccr, v_ccr_defence, 'ccr.reply', 'Reply in CCR',
+        'Reply in the counterclaim for revocation',
+        'defendant', 'filing', true, 2, 'months', NULL,
+        'Timing overlaps with infringement Rejoinder',
+        false, NULL, 1, true);
+
+    -- Rejoinder in CCR
+    v_ccr_rejoin := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_rejoin, v_ccr, v_ccr_reply, 'ccr.rejoin', 'Rejoinder in CCR',
+        'Rejoinder in the counterclaim for revocation',
+        'claimant', 'filing', true, 2, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    -- Interim Conference
+    v_ccr_interim := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_interim, v_ccr, v_ccr_rejoin, 'ccr.interim', 'Interim Conference',
+        'Interim conference covering revocation issues',
+        'court', 'hearing', true, 0, 'months', NULL,
+        'May be combined with infringement IC',
+        false, NULL, 0, true);
+
+    -- Oral Hearing
+    v_ccr_oral := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_oral, v_ccr, v_ccr_interim, 'ccr.oral', 'Oral Hearing',
+        'Oral hearing on validity',
+        'court', 'hearing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    -- Decision
+    v_ccr_decision := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_ccr_decision, v_ccr, v_ccr_oral, 'ccr.decision', 'Decision',
+        'Decision on validity of the patent',
+        'court', 'decision', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    -- Appeal from CCR
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_app, v_ccr_decision, 'ccr.appeal', 'Appeal',
+        'Appeal against revocation decision to Court of Appeal',
+        'both', 'filing', true, 2, 'months', 'RoP.220.1', NULL,
+        true, 'Appeal filed', 0, true);
+
+    -- Application to Amend Patent (spawn from Defence to CCR)
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_amd, v_ccr_defence, 'ccr.amend', 'Application to Amend Patent',
+        'Patent proprietor applies to amend the patent during revocation proceedings',
+        'claimant', 'filing', false, 0, 'months', NULL, NULL,
+        true, 'Includes application to amend patent', 2, true);
+
+    -- ========================================
+    -- STANDALONE REVOCATION
+    -- ========================================
+
+    v_rev_app := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_app, v_rev, NULL, 'rev.app', 'Application for Revocation',
+        'Applicant files standalone application for revocation of the patent',
+        'claimant', 'filing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_rev_defence := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_defence, v_rev, v_rev_app, 'rev.defence', 'Defence to Revocation',
+        'Patent proprietor files defence to revocation application',
+        'defendant', 'filing', true, 3, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_rev_reply := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_reply, v_rev, v_rev_defence, 'rev.reply', 'Reply',
+        'Reply in standalone revocation proceedings',
+        'claimant', 'filing', true, 2, 'months', NULL, NULL,
+        false, NULL, 1, true);
+
+    v_rev_rejoin := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_rejoin, v_rev, v_rev_reply, 'rev.rejoin', 'Rejoinder',
+        'Rejoinder in standalone revocation proceedings',
+        'defendant', 'filing', true, 2, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_rev_interim := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_interim, v_rev, v_rev_rejoin, 'rev.interim', 'Interim Conference',
+        'Interim conference with the judge-rapporteur',
+        'court', 'hearing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_rev_oral := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_oral, v_rev, v_rev_interim, 'rev.oral', 'Oral Hearing',
+        'Oral hearing on validity in standalone revocation',
+        'court', 'hearing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_rev_decision := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_rev_decision, v_rev, v_rev_oral, 'rev.decision', 'Decision',
+        'Decision on patent validity',
+        'court', 'decision', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    -- Appeal from REV
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_app, v_rev_decision, 'rev.appeal', 'Appeal',
+        'Appeal against revocation decision to Court of Appeal',
+        'both', 'filing', true, 2, 'months', 'RoP.220.1', NULL,
+        true, 'Appeal filed', 0, true);
+
+    -- Application to Amend Patent from REV Defence
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_amd, v_rev_defence, 'rev.amend', 'Application to Amend Patent',
+        'Patent proprietor applies to amend the patent',
+        'claimant', 'filing', false, 0, 'months', NULL, NULL,
+        true, 'Includes application to amend patent', 2, true);
+
+    -- ========================================
+    -- PRELIMINARY INJUNCTION
+    -- ========================================
+
+    v_pi_app := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_pi_app, v_apm, NULL, 'pi.app', 'Application for Provisional Measures',
+        'Claimant files application for preliminary injunction',
+        'claimant', 'filing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_pi_resp := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_pi_resp, v_apm, v_pi_app, 'pi.response', 'Response to PI Application',
+        'Defendant files response to preliminary injunction application',
+        'defendant', 'filing', true, 0, 'months', NULL,
+        'Deadline set by court',
+        false, NULL, 0, true);
+
+    v_pi_oral := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_pi_oral, v_apm, v_pi_resp, 'pi.oral', 'Oral Hearing',
+        'Oral hearing on provisional measures',
+        'court', 'hearing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_apm, v_pi_oral, 'pi.order', 'Order on Provisional Measures',
+        'Court issues order on preliminary injunction',
+        'court', 'decision', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    -- ========================================
+    -- APPEAL (standalone)
+    -- ========================================
+
+    v_app_notice := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_app_notice, v_app, NULL, 'app.notice', 'Notice of Appeal',
+        'Appellant files notice of appeal with the Court of Appeal',
+        'both', 'filing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_app_grounds := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_app_grounds, v_app, v_app_notice, 'app.grounds', 'Statement of Grounds of Appeal',
+        'Appellant files statement of grounds',
+        'both', 'filing', true, 2, 'months', 'RoP.220.1', NULL,
+        false, NULL, 0, true);
+
+    v_app_response := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_app_response, v_app, v_app_grounds, 'app.response', 'Response to Appeal',
+        'Respondent files response to the appeal',
+        'both', 'filing', true, 2, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    v_app_oral := gen_random_uuid();
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (v_app_oral, v_app, v_app_response, 'app.oral', 'Oral Hearing',
+        'Oral hearing before the Court of Appeal',
+        'court', 'hearing', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    INSERT INTO deadline_rules (id, proceeding_type_id, parent_id, code, name, description,
+        primary_party, event_type, is_mandatory, duration_value, duration_unit,
+        rule_code, deadline_notes, is_spawn, spawn_label, sequence_order, is_active)
+    VALUES (gen_random_uuid(), v_app, v_app_oral, 'app.decision', 'Decision',
+        'Court of Appeal delivers its decision',
+        'court', 'decision', true, 0, 'months', NULL, NULL,
+        false, NULL, 0, true);
+
+    -- ========================================
+    -- 5. Set conditional deadlines (from 040)
+    -- ========================================
+
+    -- Reply to Defence: rule code changes when CCR is active
+    -- Default: RoP.029b | With CCR: RoP.029a
+    UPDATE deadline_rules
+    SET condition_rule_id = v_ccr_root,
+        alt_rule_code = 'RoP.029a'
+    WHERE id = v_inf_reply;
+
+    -- Rejoinder: duration changes when CCR is active
+    -- Default: 1 month RoP.029c | With CCR: 2 months RoP.029d
+    UPDATE deadline_rules
+    SET condition_rule_id = v_ccr_root,
+        alt_duration_value = 2,
+        alt_duration_unit = 'months',
+        alt_rule_code = 'RoP.029d'
+    WHERE id = v_inf_rejoin;
+
+END $$;
--- a/frontend/src/app/(app)/fristen/rechner/page.tsx
+++ b/frontend/src/app/(app)/fristen/rechner/page.tsx
@@ -1,28 +1,61 @@
 "use client";

 import { DeadlineCalculator } from "@/components/deadlines/DeadlineCalculator";
+import { DeadlineWizard } from "@/components/deadlines/DeadlineWizard";
 import { ArrowLeft } from "lucide-react";
 import Link from "next/link";
+import { useState } from "react";

 export default function FristenrechnerPage() {
+  const [mode, setMode] = useState<"wizard" | "quick">("wizard");
+
  return (
    <div className="animate-fade-in space-y-4">
-      <div>
-        <Link
-          href="/fristen"
-          className="mb-2 inline-flex items-center gap-1 text-sm text-neutral-500 transition-colors hover:text-neutral-700"
-        >
-          <ArrowLeft className="h-3.5 w-3.5" />
-          Zurück zu Fristen
-        </Link>
-        <h1 className="text-lg font-semibold text-neutral-900">
-          Fristenrechner
-        </h1>
-        <p className="mt-0.5 text-sm text-neutral-500">
-          Berechnen Sie Fristen basierend auf Verfahrensart und Auslösedatum
-        </p>
+      <div className="flex items-start justify-between">
+        <div>
+          <Link
+            href="/fristen"
+            className="mb-2 inline-flex items-center gap-1 text-sm text-neutral-500 transition-colors hover:text-neutral-700"
+          >
+            <ArrowLeft className="h-3.5 w-3.5" />
+            Zurueck zu Fristen
+          </Link>
+          <h1 className="text-lg font-semibold text-neutral-900">
+            Fristenbestimmung
+          </h1>
+          <p className="mt-0.5 text-sm text-neutral-500">
+            {mode === "wizard"
+              ? "Vollstaendige Verfahrens-Timeline mit automatischer Fristenberechnung"
+              : "Schnellberechnung einzelner Fristen nach Verfahrensart"}
+          </p>
+        </div>
+
+        {/* Mode toggle */}
+        <div className="flex rounded-md border border-neutral-200 bg-neutral-50 p-0.5">
+          <button
+            onClick={() => setMode("wizard")}
+            className={`rounded px-3 py-1 text-xs font-medium transition-colors ${
+              mode === "wizard"
+                ? "bg-white text-neutral-900 shadow-sm"
+                : "text-neutral-500 hover:text-neutral-700"
+            }`}
+          >
+            Verfahren
+          </button>
+          <button
+            onClick={() => setMode("quick")}
+            className={`rounded px-3 py-1 text-xs font-medium transition-colors ${
+              mode === "quick"
+                ? "bg-white text-neutral-900 shadow-sm"
+                : "text-neutral-500 hover:text-neutral-700"
+            }`}
+          >
+            Schnell
+          </button>
+        </div>
      </div>
-      <DeadlineCalculator />
+
+      {mode === "wizard" ? <DeadlineWizard /> : <DeadlineCalculator />}
    </div>
  );
 }
--- a/frontend/src/components/deadlines/DeadlineWizard.tsx
+++ b/frontend/src/components/deadlines/DeadlineWizard.tsx
@@ -0,0 +1,622 @@
+"use client";
+
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type {
+  ProceedingType,
+  TimelineResponse,
+  DetermineResponse,
+  TimelineEvent,
+  Case,
+} from "@/lib/types";
+import { format, parseISO, isPast, isThisWeek, isBefore, addDays } from "date-fns";
+import { de } from "date-fns/locale";
+import {
+  Scale,
+  Calendar,
+  ChevronRight,
+  ChevronDown,
+  GitBranch,
+  Check,
+  Clock,
+  AlertTriangle,
+  FileText,
+  Users,
+  Gavel,
+  ArrowRight,
+  RotateCcw,
+  Loader2,
+  CheckCircle2,
+  FolderOpen,
+} from "lucide-react";
+import { useState, useCallback, useMemo } from "react";
+import { toast } from "sonner";
+
+// --- Helpers ---
+
+function formatDuration(value: number, unit: string): string {
+  if (value === 0) return "";
+  const labels: Record<string, string> = {
+    days: value === 1 ? "Tag" : "Tage",
+    weeks: value === 1 ? "Woche" : "Wochen",
+    months: value === 1 ? "Monat" : "Monate",
+  };
+  return `${value} ${labels[unit] || unit}`;
+}
+
+function getPartyIcon(party?: string) {
+  switch (party) {
+    case "claimant":
+      return <Scale className="h-3.5 w-3.5" />;
+    case "defendant":
+      return <Users className="h-3.5 w-3.5" />;
+    case "court":
+      return <Gavel className="h-3.5 w-3.5" />;
+    default:
+      return <FileText className="h-3.5 w-3.5" />;
+  }
+}
+
+function getPartyLabel(party?: string): string {
+  switch (party) {
+    case "claimant":
+      return "Klaeger";
+    case "defendant":
+      return "Beklagter";
+    case "court":
+      return "Gericht";
+    case "both":
+      return "Beide Parteien";
+    default:
+      return "";
+  }
+}
+
+function getEventTypeLabel(type?: string): string {
+  switch (type) {
+    case "filing":
+      return "Einreichung";
+    case "hearing":
+      return "Verhandlung";
+    case "decision":
+      return "Entscheidung";
+    default:
+      return "";
+  }
+}
+
+type Urgency = "past" | "overdue" | "this_week" | "upcoming" | "future" | "none";
+
+function getUrgency(dateStr?: string): Urgency {
+  if (!dateStr) return "none";
+  const date = parseISO(dateStr);
+  const today = new Date();
+  today.setHours(0, 0, 0, 0);
+  if (isPast(date) && isBefore(date, today)) return "overdue";
+  if (isThisWeek(date, { weekStartsOn: 1 })) return "this_week";
+  if (isBefore(date, addDays(today, 30))) return "upcoming";
+  return "future";
+}
+
+const urgencyStyles: Record<Urgency, { dot: string; text: string; bg: string }> = {
+  past: { dot: "bg-neutral-400", text: "text-neutral-500", bg: "bg-neutral-50" },
+  overdue: { dot: "bg-red-500", text: "text-red-700", bg: "bg-red-50" },
+  this_week: { dot: "bg-amber-500", text: "text-amber-700", bg: "bg-amber-50" },
+  upcoming: { dot: "bg-blue-500", text: "text-blue-700", bg: "bg-blue-50" },
+  future: { dot: "bg-green-500", text: "text-green-700", bg: "bg-green-50" },
+  none: { dot: "bg-neutral-300", text: "text-neutral-500", bg: "bg-neutral-50" },
+};
+
+// --- Spawn Extraction ---
+
+function extractSpawns(events: TimelineEvent[]): TimelineEvent[] {
+  const spawns: TimelineEvent[] = [];
+  function walk(evts: TimelineEvent[]) {
+    for (const ev of evts) {
+      if (ev.is_spawn) spawns.push(ev);
+      if (ev.children) walk(ev.children);
+    }
+  }
+  walk(events);
+  return spawns;
+}
+
+// --- Flat timeline extraction ---
+
+function flattenTimeline(events: TimelineEvent[], depth = 0): (TimelineEvent & { depth: number })[] {
+  const result: (TimelineEvent & { depth: number })[] = [];
+  for (const ev of events) {
+    result.push({ ...ev, depth });
+    if (ev.children && ev.children.length > 0) {
+      result.push(...flattenTimeline(ev.children, depth + 1));
+    }
+  }
+  return result;
+}
+
+// --- Main Component ---
+
+export function DeadlineWizard() {
+  const [selectedType, setSelectedType] = useState<string>("");
+  const [triggerDate, setTriggerDate] = useState("");
+  const [conditions, setConditions] = useState<Record<string, boolean>>({});
+  const [selectedCaseId, setSelectedCaseId] = useState<string>("");
+  const [showBatchPanel, setShowBatchPanel] = useState(false);
+  const queryClient = useQueryClient();
+
+  // Fetch proceeding types
+  const { data: proceedingTypes, isLoading: typesLoading } = useQuery({
+    queryKey: ["proceeding-types"],
+    queryFn: () => api.get<ProceedingType[]>("/proceeding-types"),
+  });
+
+  // Fetch timeline structure when type is selected
+  const { data: timelineData } = useQuery({
+    queryKey: ["timeline", selectedType],
+    queryFn: () => api.get<TimelineResponse>(`/proceeding-types/${selectedType}/timeline`),
+    enabled: !!selectedType,
+  });
+
+  // Determine mutation
+  const determineMutation = useMutation({
+    mutationFn: (params: { proceeding_type: string; trigger_event_date: string; conditions: Record<string, boolean> }) =>
+      api.post<DetermineResponse>("/deadlines/determine", params),
+  });
+
+  // Cases for batch create
+  const { data: cases } = useQuery({
+    queryKey: ["cases"],
+    queryFn: () => api.get<Case[]>("/cases"),
+    enabled: showBatchPanel,
+  });
+
+  // Batch create mutation
+  const batchMutation = useMutation({
+    mutationFn: (params: { caseId: string; deadlines: { title: string; due_date: string; rule_code?: string }[] }) =>
+      api.post(`/cases/${params.caseId}/deadlines/batch`, { deadlines: params.deadlines }),
+    onSuccess: () => {
+      toast.success("Alle Fristen wurden auf die Akte uebernommen");
+      queryClient.invalidateQueries({ queryKey: ["deadlines"] });
+      setShowBatchPanel(false);
+    },
+    onError: () => {
+      toast.error("Fehler beim Erstellen der Fristen");
+    },
+  });
+
+  // Spawns from timeline structure (for condition toggles)
+  const spawns = useMemo(() => {
+    if (!timelineData?.timeline) return [];
+    return extractSpawns(timelineData.timeline);
+  }, [timelineData]);
+
+  // Calculate on type/date/condition change
+  const calculate = useCallback(() => {
+    if (!selectedType || !triggerDate) return;
+    determineMutation.mutate({
+      proceeding_type: selectedType,
+      trigger_event_date: triggerDate,
+      conditions,
+    });
+  }, [selectedType, triggerDate, conditions, determineMutation]);
+
+  // Auto-calculate when date or conditions change
+  const handleDateChange = (date: string) => {
+    setTriggerDate(date);
+    if (selectedType && date) {
+      determineMutation.mutate({
+        proceeding_type: selectedType,
+        trigger_event_date: date,
+        conditions,
+      });
+    }
+  };
+
+  const handleConditionToggle = (spawnId: string) => {
+    const next = { ...conditions, [spawnId]: !conditions[spawnId] };
+    setConditions(next);
+    if (selectedType && triggerDate) {
+      determineMutation.mutate({
+        proceeding_type: selectedType,
+        trigger_event_date: triggerDate,
+        conditions: next,
+      });
+    }
+  };
+
+  const handleTypeSelect = (code: string) => {
+    setSelectedType(code);
+    setConditions({});
+    if (triggerDate) {
+      // Will recalculate once timeline loads
+      determineMutation.reset();
+    }
+  };
+
+  const handleReset = () => {
+    setSelectedType("");
+    setTriggerDate("");
+    setConditions({});
+    setShowBatchPanel(false);
+    determineMutation.reset();
+  };
+
+  // Collect calculated deadlines for batch create
+  const collectDeadlines = (events: TimelineEvent[]): { title: string; due_date: string; rule_code?: string }[] => {
+    const result: { title: string; due_date: string; rule_code?: string }[] = [];
+    for (const ev of events) {
+      if (ev.date && ev.duration_value > 0) {
+        result.push({ title: ev.name, due_date: ev.date, rule_code: ev.rule_code || undefined });
+      }
+      if (ev.children) result.push(...collectDeadlines(ev.children));
+    }
+    return result;
+  };
+
+  const results = determineMutation.data;
+  const selectedPT = proceedingTypes?.find((pt) => pt.code === selectedType);
+
+  return (
+    <div className="space-y-5">
+      {/* Step 1: Proceeding Type Selection */}
+      <div className="rounded-lg border border-neutral-200 bg-white p-5">
+        <div className="flex items-center justify-between">
+          <div className="flex items-center gap-2 text-sm font-medium text-neutral-900">
+            <Scale className="h-4 w-4" />
+            Verfahrensart waehlen
+          </div>
+          {selectedType && (
+            <button
+              onClick={handleReset}
+              className="flex items-center gap-1 text-xs text-neutral-500 hover:text-neutral-700"
+            >
+              <RotateCcw className="h-3 w-3" />
+              Zuruecksetzen
+            </button>
+          )}
+        </div>
+
+        <div className="mt-4 grid grid-cols-2 gap-2 sm:grid-cols-3 lg:grid-cols-6">
+          {typesLoading ? (
+            <div className="col-span-full flex justify-center py-4">
+              <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
+            </div>
+          ) : (
+            proceedingTypes?.map((pt) => (
+              <button
+                key={pt.id}
+                onClick={() => handleTypeSelect(pt.code)}
+                className={`rounded-lg border px-3 py-2.5 text-left transition-all ${
+                  selectedType === pt.code
+                    ? "border-neutral-900 bg-neutral-900 text-white shadow-sm"
+                    : "border-neutral-200 bg-white text-neutral-700 hover:border-neutral-400 hover:bg-neutral-50"
+                }`}
+              >
+                <div className="flex items-center gap-1.5">
+                  <div
+                    className="h-2 w-2 rounded-full"
+                    style={{ backgroundColor: pt.default_color }}
+                  />
+                  <span className="text-xs font-semibold">{pt.code}</span>
+                </div>
+                <div className="mt-1 text-xs leading-tight opacity-80">{pt.name}</div>
+              </button>
+            ))
+          )}
+        </div>
+      </div>
+
+      {/* Step 2: Date + Conditions */}
+      {selectedType && (
+        <div className="animate-fade-in rounded-lg border border-neutral-200 bg-white p-5">
+          <div className="flex items-center gap-2 text-sm font-medium text-neutral-900">
+            <Calendar className="h-4 w-4" />
+            Ausloesendes Ereignis
+          </div>
+
+          <div className="mt-4 flex flex-col gap-4 sm:flex-row sm:items-end">
+            <div className="flex-1">
+              <label className="mb-1 block text-xs font-medium text-neutral-500">
+                Datum des {selectedPT?.name || selectedType} (z.B. Klagezustellung)
+              </label>
+              <input
+                type="date"
+                value={triggerDate}
+                onChange={(e) => handleDateChange(e.target.value)}
+                className="w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400"
+              />
+            </div>
+
+            {/* Condition toggles */}
+            {spawns.length > 0 && (
+              <div className="flex flex-wrap gap-2">
+                {spawns.map((spawn) => (
+                  <button
+                    key={spawn.id}
+                    onClick={() => handleConditionToggle(spawn.id)}
+                    className={`flex items-center gap-1.5 rounded-full px-3 py-1.5 text-xs font-medium transition-all ${
+                      conditions[spawn.id]
+                        ? "bg-neutral-900 text-white"
+                        : "border border-neutral-300 bg-white text-neutral-600 hover:bg-neutral-50"
+                    }`}
+                  >
+                    <GitBranch className="h-3 w-3" />
+                    {spawn.spawn_label || spawn.name}
+                    {conditions[spawn.id] && <Check className="h-3 w-3" />}
+                  </button>
+                ))}
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+
+      {/* Error */}
+      {determineMutation.isError && (
+        <div className="flex items-center gap-2 rounded-lg border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">
+          <AlertTriangle className="h-4 w-4 shrink-0" />
+          Fehler bei der Berechnung. Bitte Eingaben pruefen.
+        </div>
+      )}
+
+      {/* Step 3: Calculated Timeline */}
+      {results && results.timeline && (
+        <div className="animate-fade-in space-y-3">
+          {/* Header */}
+          <div className="flex items-center justify-between">
+            <div>
+              <h3 className="text-sm font-medium text-neutral-900">
+                Verfahrens-Timeline: {results.proceeding_name}
+              </h3>
+              <p className="mt-0.5 text-xs text-neutral-500">
+                {results.total_deadlines} Ereignisse ab{" "}
+                {format(parseISO(results.trigger_event_date), "dd. MMMM yyyy", { locale: de })}
+              </p>
+            </div>
+            <button
+              onClick={() => setShowBatchPanel(!showBatchPanel)}
+              className="flex items-center gap-1.5 rounded-md bg-neutral-900 px-3 py-1.5 text-xs font-medium text-white transition-colors hover:bg-neutral-800"
+            >
+              <CheckCircle2 className="h-3.5 w-3.5" />
+              Alle uebernehmen
+            </button>
+          </div>
+
+          {/* Timeline visualization */}
+          <div className="rounded-lg border border-neutral-200 bg-white">
+            <TimelineTree events={results.timeline} conditions={conditions} depth={0} />
+          </div>
+
+          {/* Batch create panel */}
+          {showBatchPanel && (
+            <div className="animate-fade-in rounded-lg border border-neutral-200 bg-neutral-50 p-4">
+              <div className="flex items-center gap-2 text-sm font-medium text-neutral-900">
+                <FolderOpen className="h-4 w-4" />
+                Fristen auf Akte uebernehmen
+              </div>
+              <div className="mt-3 flex gap-3">
+                <select
+                  value={selectedCaseId}
+                  onChange={(e) => setSelectedCaseId(e.target.value)}
+                  className="flex-1 rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none focus:border-neutral-400"
+                >
+                  <option value="">Akte waehlen...</option>
+                  {cases
+                    ?.filter((c) => c.status !== "closed")
+                    .map((c) => (
+                      <option key={c.id} value={c.id}>
+                        {c.case_number} — {c.title}
+                      </option>
+                    ))}
+                </select>
+                <button
+                  disabled={!selectedCaseId || batchMutation.isPending}
+                  onClick={() => {
+                    const deadlines = collectDeadlines(results.timeline);
+                    if (deadlines.length === 0) return;
+                    batchMutation.mutate({ caseId: selectedCaseId, deadlines });
+                  }}
+                  className="flex items-center gap-1.5 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:cursor-not-allowed disabled:opacity-50"
+                >
+                  {batchMutation.isPending ? (
+                    <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                  ) : (
+                    <ArrowRight className="h-3.5 w-3.5" />
+                  )}
+                  {batchMutation.isPending ? "Erstelle..." : `${collectDeadlines(results.timeline).length} Fristen erstellen`}
+                </button>
+              </div>
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Empty state */}
+      {!results && !determineMutation.isPending && selectedType && triggerDate && (
+        <div className="flex items-center justify-center py-8">
+          <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
+        </div>
+      )}
+
+      {!selectedType && (
+        <div className="flex flex-col items-center rounded-lg border border-dashed border-neutral-300 bg-white px-6 py-12 text-center">
+          <div className="rounded-xl bg-neutral-100 p-3">
+            <Scale className="h-6 w-6 text-neutral-400" />
+          </div>
+          <p className="mt-3 text-sm font-medium text-neutral-700">
+            UPC-Fristenbestimmung
+          </p>
+          <p className="mt-1 max-w-sm text-xs text-neutral-500">
+            Waehlen Sie die Verfahrensart und geben Sie das Datum des ausloesenden Ereignisses ein.
+            Alle Fristen des Verfahrens werden automatisch berechnet.
+          </p>
+        </div>
+      )}
+    </div>
+  );
+}
+
+// --- Timeline Tree Component ---
+
+function TimelineTree({
+  events,
+  conditions,
+  depth,
+}: {
+  events: TimelineEvent[];
+  conditions: Record<string, boolean>;
+  depth: number;
+}) {
+  return (
+    <>
+      {events.map((ev, i) => (
+        <TimelineNode
+          key={ev.id}
+          event={ev}
+          conditions={conditions}
+          depth={depth}
+          isLast={i === events.length - 1}
+        />
+      ))}
+    </>
+  );
+}
+
+function TimelineNode({
+  event: ev,
+  conditions,
+  depth,
+  isLast,
+}: {
+  event: TimelineEvent;
+  conditions: Record<string, boolean>;
+  depth: number;
+  isLast: boolean;
+}) {
+  const [expanded, setExpanded] = useState(true);
+
+  // Skip inactive spawns
+  if (ev.is_spawn && !conditions[ev.id]) return null;
+
+  const hasChildren = ev.children && ev.children.length > 0;
+  const visibleChildren = ev.children?.filter(
+    (c) => !c.is_spawn || conditions[c.id]
+  );
+  const hasVisibleChildren = visibleChildren && visibleChildren.length > 0;
+
+  const urgency = getUrgency(ev.date);
+  const styles = urgencyStyles[urgency];
+  const duration = formatDuration(ev.duration_value, ev.duration_unit);
+  const isConditional = ev.has_condition && ev.condition_rule_id;
+
+  return (
+    <>
+      <div
+        className={`group relative flex gap-3 px-4 py-3 transition-colors hover:bg-neutral-50 ${
+          !isLast && depth === 0 ? "border-b border-neutral-100" : ""
+        }`}
+        style={{ paddingLeft: `${16 + depth * 24}px` }}
+      >
+        {/* Timeline connector */}
+        <div className="flex flex-col items-center pt-1">
+          <div className={`h-3 w-3 shrink-0 rounded-full border-2 border-white shadow-sm ${styles.dot}`} />
+          {!isLast && <div className="mt-1 w-px flex-1 bg-neutral-200" />}
+        </div>
+
+        {/* Content */}
+        <div className="min-w-0 flex-1">
+          <div className="flex flex-col gap-1 sm:flex-row sm:items-start sm:justify-between sm:gap-2">
+            <div className="flex items-center gap-1.5">
+              {hasVisibleChildren && (
+                <button
+                  onClick={() => setExpanded(!expanded)}
+                  className="text-neutral-400 hover:text-neutral-600"
+                >
+                  {expanded ? (
+                    <ChevronDown className="h-3.5 w-3.5" />
+                  ) : (
+                    <ChevronRight className="h-3.5 w-3.5" />
+                  )}
+                </button>
+              )}
+              {ev.is_spawn && (
+                <GitBranch className="h-3.5 w-3.5 text-violet-500" />
+              )}
+              <span className="text-sm font-medium text-neutral-900">{ev.name}</span>
+              {!ev.is_mandatory && (
+                <span className="rounded bg-neutral-100 px-1 py-0.5 text-[10px] text-neutral-500">
+                  optional
+                </span>
+              )}
+            </div>
+
+            {/* Date */}
+            {ev.date && (
+              <div className="flex items-center gap-1.5 shrink-0">
+                {ev.was_adjusted && (
+                  <span className="text-[10px] text-amber-600" title={`Original: ${ev.original_date}`}>
+                    angepasst
+                  </span>
+                )}
+                <span className={`text-sm font-medium tabular-nums ${styles.text}`}>
+                  {format(parseISO(ev.date), "dd.MM.yyyy")}
+                </span>
+              </div>
+            )}
+          </div>
+
+          {/* Meta row */}
+          <div className="mt-0.5 flex flex-wrap items-center gap-x-2 gap-y-0.5 text-xs text-neutral-500">
+            {ev.primary_party && (
+              <span className="flex items-center gap-0.5">
+                {getPartyIcon(ev.primary_party)}
+                {getPartyLabel(ev.primary_party)}
+              </span>
+            )}
+            {ev.event_type && (
+              <>
+                <span className="text-neutral-300">·</span>
+                <span>{getEventTypeLabel(ev.event_type)}</span>
+              </>
+            )}
+            {duration && (
+              <>
+                <span className="text-neutral-300">·</span>
+                <span className="flex items-center gap-0.5">
+                  <Clock className="h-3 w-3" />
+                  {duration}
+                </span>
+              </>
+            )}
+            {ev.rule_code && (
+              <>
+                <span className="text-neutral-300">·</span>
+                <span className="rounded bg-neutral-100 px-1 py-0.5 font-mono text-[10px]">
+                  {ev.rule_code}
+                </span>
+              </>
+            )}
+            {isConditional && (
+              <>
+                <span className="text-neutral-300">·</span>
+                <span className="text-violet-600">
+                  bedingt{ev.alt_rule_code ? ` (${ev.alt_rule_code})` : ""}
+                </span>
+              </>
+            )}
+          </div>
+
+          {/* Notes */}
+          {ev.deadline_notes && (
+            <p className="mt-1 text-xs text-neutral-400 italic">{ev.deadline_notes}</p>
+          )}
+        </div>
+      </div>
+
+      {/* Children */}
+      {expanded && hasVisibleChildren && (
+        <TimelineTree events={visibleChildren!} conditions={conditions} depth={depth + 1} />
+      )}
+    </>
+  );
+}
--- a/frontend/src/lib/types.ts
+++ b/frontend/src/lib/types.ts
@@ -120,12 +120,76 @@ export interface DeadlineRule {
  rule_code?: string;
  deadline_notes?: string;
  sequence_order: number;
+  condition_rule_id?: string;
+  alt_duration_value?: number;
+  alt_duration_unit?: string;
+  alt_rule_code?: string;
+  is_spawn?: boolean;
+  spawn_label?: string;
 }

 export interface RuleTreeNode extends DeadlineRule {
  children?: RuleTreeNode[];
 }

+// Timeline determination types
+
+export interface TimelineEvent {
+  id: string;
+  code?: string;
+  name: string;
+  description?: string;
+  primary_party?: string;
+  event_type?: string;
+  is_mandatory: boolean;
+  duration_value: number;
+  duration_unit: string;
+  rule_code?: string;
+  deadline_notes?: string;
+  is_spawn: boolean;
+  spawn_label?: string;
+  has_condition: boolean;
+  condition_rule_id?: string;
+  alt_rule_code?: string;
+  alt_duration_value?: number;
+  alt_duration_unit?: string;
+  date?: string;
+  original_date?: string;
+  was_adjusted: boolean;
+  children?: TimelineEvent[];
+}
+
+export interface TimelineResponse {
+  proceeding_type: ProceedingType;
+  timeline: TimelineEvent[];
+}
+
+export interface DetermineRequest {
+  proceeding_type: string;
+  trigger_event_date: string;
+  conditions: Record<string, boolean>;
+}
+
+export interface DetermineResponse {
+  proceeding_type: string;
+  proceeding_name: string;
+  proceeding_color: string;
+  trigger_event_date: string;
+  timeline: TimelineEvent[];
+  total_deadlines: number;
+}
+
+export interface BatchCreateRequest {
+  deadlines: {
+    title: string;
+    due_date: string;
+    original_due_date?: string;
+    rule_id?: string;
+    rule_code?: string;
+    notes?: string;
+  }[];
+}
+
 export interface ProceedingType {
  id: number;
  code: string;