feat: add CalDAV bidirectional sync service (Phase 3O)

Implements CalDAV sync using github.com/emersion/go-webdav:

- CalDAVService with background polling (configurable per-tenant interval)
- Push: deadlines -> VTODO, appointments -> VEVENT on create/update/delete
- Pull: periodic fetch from CalDAV, reconcile with local DB
- Conflict resolution: KanzlAI wins dates/status, CalDAV wins notes/description
- Conflicts logged as case_events with caldav_conflict type
- UID pattern: kanzlai-{deadline|appointment}-{uuid}@kanzlai.msbls.de
- CalDAV config per tenant in tenants.settings JSONB

Endpoints:
- POST /api/caldav/sync — trigger full sync for current tenant
- GET /api/caldav/status — last sync time, item counts, errors

8 unit tests for UID generation, parsing, path construction, config parsing.

backend/cmd/server/main.go

@@ -8,6 +8,7 @@ import (
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/config"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/db"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/router"
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )
 
 func main() {
@@ -23,7 +24,13 @@ func main() {
 	defer database.Close()
 
 	authMW := auth.NewMiddleware(cfg.SupabaseJWTSecret, database)
-	handler := router.New(database, authMW, cfg)
+
+	// Start CalDAV sync service
+	calDAVSvc := services.NewCalDAVService(database)
+	calDAVSvc.Start()
+	defer calDAVSvc.Stop()
+
+	handler := router.New(database, authMW, cfg, calDAVSvc)
 
 	log.Printf("Starting KanzlAI API server on :%s", cfg.Port)
 	if err := http.ListenAndServe(":"+cfg.Port, handler); err != nil {

backend/go.mod

@@ -3,11 +3,17 @@ module mgit.msbls.de/m/KanzlAI-mGMT
 go 1.25.5
 
 require (
-	github.com/anthropics/anthropic-sdk-go v1.27.1 // indirect
-	github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
-	github.com/jmoiron/sqlx v1.4.0 // indirect
-	github.com/lib/pq v1.12.0 // indirect
+	github.com/anthropics/anthropic-sdk-go v1.27.1
+	github.com/emersion/go-ical v0.0.0-20250609112844-439c63cef608
+	github.com/emersion/go-webdav v0.7.0
+	github.com/golang-jwt/jwt/v5 v5.3.1
+	github.com/google/uuid v1.6.0
+	github.com/jmoiron/sqlx v1.4.0
+	github.com/lib/pq v1.12.0
+)
+
+require (
+	github.com/teambition/rrule-go v1.8.2 // indirect
 	github.com/tidwall/gjson v1.18.0 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect

backend/go.sum

@@ -1,6 +1,18 @@
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/anthropics/anthropic-sdk-go v1.27.1 h1:7DgMZ2Ng3C2mPzJGHA30NXQTZolcF07mHd0tGaLwfzk=
 github.com/anthropics/anthropic-sdk-go v1.27.1/go.mod h1:qUKmaW+uuPB64iy1l+4kOSvaLqPXnHTTBKH6RVZ7q5Q=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dnaeon/go-vcr v1.2.0 h1:zHCHvJYTMh1N7xnV7zf1m1GPBF9Ad0Jk/whtQ1663qI=
+github.com/dnaeon/go-vcr v1.2.0/go.mod h1:R4UdLID7HZT3taECzJs4YgbbH6PIGXB6W/sc5OLb6RQ=
+github.com/emersion/go-ical v0.0.0-20240127095438-fc1c9d8fb2b6/go.mod h1:BEksegNspIkjCQfmzWgsgbu6KdeJ/4LwUZs7DMBzjzw=
+github.com/emersion/go-ical v0.0.0-20250609112844-439c63cef608 h1:5XWaET4YAcppq3l1/Yh2ay5VmQjUdq6qhJuucdGbmOY=
+github.com/emersion/go-ical v0.0.0-20250609112844-439c63cef608/go.mod h1:BEksegNspIkjCQfmzWgsgbu6KdeJ/4LwUZs7DMBzjzw=
+github.com/emersion/go-vcard v0.0.0-20230815062825-8fda7d206ec9/go.mod h1:HMJKR5wlh/ziNp+sHEDV2ltblO4JD2+IdDOWtGcQBTM=
+github.com/emersion/go-webdav v0.7.0 h1:cp6aBWXBf8Sjzguka9VJarr4XTkGc2IHxXI1Gq3TKpA=
+github.com/emersion/go-webdav v0.7.0/go.mod h1:mI8iBx3RAODwX7PJJ7qzsKAKs/vY429YfS2/9wKnDbQ=
+github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
 github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
 github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
 github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
@@ -11,7 +23,14 @@ github.com/jmoiron/sqlx v1.4.0/go.mod h1:ZrZ7UsYB/weZdl2Bxg6jCRO9c3YHl8r3ahlKmRT
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lib/pq v1.12.0 h1:mC1zeiNamwKBecjHarAr26c/+d8V5w/u4J0I/yASbJo=
 github.com/lib/pq v1.12.0/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
+github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
 github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/teambition/rrule-go v1.8.2 h1:lIjpjvWTj9fFUZCmuoVDrKVOtdiyzbzc93qTmRVe/J8=
+github.com/teambition/rrule-go v1.8.2/go.mod h1:Ieq5AbrKGciP1V//Wq8ktsTXwSwJHDD5mD/wLBGl3p4=
 github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
 github.com/tidwall/gjson v1.18.0 h1:FIDeeyB800efLX89e5a8Y0BNH+LOngJyGrIWxG2FKQY=
 github.com/tidwall/gjson v1.18.0/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
@@ -24,3 +43,7 @@ github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
 github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
 golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
 golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

backend/internal/handlers/caldav.go

@@ -0,0 +1,68 @@
+package handlers
+
+import (
+	"net/http"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
+)
+
+// CalDAVHandler handles CalDAV sync HTTP endpoints.
+type CalDAVHandler struct {
+	svc *services.CalDAVService
+}
+
+// NewCalDAVHandler creates a new CalDAV handler.
+func NewCalDAVHandler(svc *services.CalDAVService) *CalDAVHandler {
+	return &CalDAVHandler{svc: svc}
+}
+
+// TriggerSync handles POST /api/caldav/sync — triggers a full sync for the current tenant.
+func (h *CalDAVHandler) TriggerSync(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusUnauthorized, "no tenant context")
+		return
+	}
+
+	cfg, err := h.svc.LoadTenantConfig(tenantID)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	status, err := h.svc.SyncTenant(r.Context(), tenantID, *cfg)
+	if err != nil {
+		// Still return the status — it contains partial results + error info
+		writeJSON(w, http.StatusOK, map[string]any{
+			"status": "completed_with_errors",
+			"sync":   status,
+		})
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"status": "ok",
+		"sync":   status,
+	})
+}
+
+// GetStatus handles GET /api/caldav/status — returns last sync status.
+func (h *CalDAVHandler) GetStatus(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusUnauthorized, "no tenant context")
+		return
+	}
+
+	status := h.svc.GetStatus(tenantID)
+	if status == nil {
+		writeJSON(w, http.StatusOK, map[string]any{
+			"status":       "no_sync_yet",
+			"last_sync_at": nil,
+		})
+		return
+	}
+
+	writeJSON(w, http.StatusOK, status)
+}

backend/internal/handlers/deadline_rules.go

@@ -39,6 +39,17 @@ func (h *DeadlineRuleHandlers) List(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, rules)
 }
 
+// ListProceedingTypes handles GET /api/proceeding-types
+func (h *DeadlineRuleHandlers) ListProceedingTypes(w http.ResponseWriter, r *http.Request) {
+	types, err := h.rules.ListProceedingTypes()
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to list proceeding types")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, types)
+}
+
 // GetRuleTree handles GET /api/deadline-rules/{type}
 // {type} is the proceeding type code (e.g., "INF", "REV")
 func (h *DeadlineRuleHandlers) GetRuleTree(w http.ResponseWriter, r *http.Request) {

backend/internal/handlers/deadlines.go

@@ -20,6 +20,23 @@ func NewDeadlineHandlers(ds *services.DeadlineService, db *sqlx.DB) *DeadlineHan
 	return &DeadlineHandlers{deadlines: ds, db: db}
 }
 
+// ListAll handles GET /api/deadlines
+func (h *DeadlineHandlers) ListAll(w http.ResponseWriter, r *http.Request) {
+	tenantID, err := resolveTenant(r, h.db)
+	if err != nil {
+		handleTenantError(w, err)
+		return
+	}
+
+	deadlines, err := h.deadlines.ListAll(tenantID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to list deadlines")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, deadlines)
+}
+
 // ListForCase handles GET /api/cases/{caseID}/deadlines
 func (h *DeadlineHandlers) ListForCase(w http.ResponseWriter, r *http.Request) {
 	tenantID, err := resolveTenant(r, h.db)

backend/internal/router/router.go

@@ -12,7 +12,7 @@ import (
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )
 
-func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config) http.Handler {
+func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *services.CalDAVService) http.Handler {
 	mux := http.NewServeMux()
 
 	// Services
@@ -81,6 +81,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config) http.Handler
 	scoped.HandleFunc("DELETE /api/parties/{partyId}", partyH.Delete)
 
 	// Deadlines
+	scoped.HandleFunc("GET /api/deadlines", deadlineH.ListAll)
 	scoped.HandleFunc("GET /api/cases/{caseID}/deadlines", deadlineH.ListForCase)
 	scoped.HandleFunc("POST /api/cases/{caseID}/deadlines", deadlineH.Create)
 	scoped.HandleFunc("PUT /api/deadlines/{deadlineID}", deadlineH.Update)
@@ -90,6 +91,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config) http.Handler
 	// Deadline rules (reference data)
 	scoped.HandleFunc("GET /api/deadline-rules", ruleH.List)
 	scoped.HandleFunc("GET /api/deadline-rules/{type}", ruleH.GetRuleTree)
+	scoped.HandleFunc("GET /api/proceeding-types", ruleH.ListProceedingTypes)
 
 	// Deadline calculator
 	scoped.HandleFunc("POST /api/deadlines/calculate", calcH.Calculate)
@@ -116,6 +118,13 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config) http.Handler
 		scoped.HandleFunc("POST /api/ai/summarize-case", aiH.SummarizeCase)
 	}
 
+	// CalDAV sync endpoints
+	if calDAVSvc != nil {
+		calDAVH := handlers.NewCalDAVHandler(calDAVSvc)
+		scoped.HandleFunc("POST /api/caldav/sync", calDAVH.TriggerSync)
+		scoped.HandleFunc("GET /api/caldav/status", calDAVH.GetStatus)
+	}
+
 	// Wire: auth -> tenant routes go directly, scoped routes get tenant resolver
 	api.Handle("/api/", tenantResolver.Resolve(scoped))
 

backend/internal/services/caldav_service.go

@@ -0,0 +1,687 @@
+package services
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/emersion/go-ical"
+	"github.com/emersion/go-webdav"
+	"github.com/emersion/go-webdav/caldav"
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
+)
+
+const (
+	calDAVDomain   = "kanzlai.msbls.de"
+	calDAVProdID   = "-//KanzlAI//KanzlAI-mGMT//EN"
+	defaultSyncMin = 15
+)
+
+// CalDAVConfig holds per-tenant CalDAV configuration from tenants.settings.
+type CalDAVConfig struct {
+	URL                 string `json:"url"`
+	Username            string `json:"username"`
+	Password            string `json:"password"`
+	CalendarPath        string `json:"calendar_path"`
+	SyncEnabled         bool   `json:"sync_enabled"`
+	SyncIntervalMinutes int    `json:"sync_interval_minutes"`
+}
+
+// SyncStatus holds the last sync result for a tenant.
+type SyncStatus struct {
+	TenantID     uuid.UUID `json:"tenant_id"`
+	LastSyncAt   time.Time `json:"last_sync_at"`
+	ItemsPushed  int       `json:"items_pushed"`
+	ItemsPulled  int       `json:"items_pulled"`
+	Errors       []string  `json:"errors,omitempty"`
+	SyncDuration string    `json:"sync_duration"`
+}
+
+// CalDAVService handles bidirectional CalDAV synchronization.
+type CalDAVService struct {
+	db *sqlx.DB
+
+	mu       sync.RWMutex
+	statuses map[uuid.UUID]*SyncStatus // per-tenant sync status
+
+	stopCh chan struct{}
+	wg     sync.WaitGroup
+}
+
+// NewCalDAVService creates a new CalDAV sync service.
+func NewCalDAVService(db *sqlx.DB) *CalDAVService {
+	return &CalDAVService{
+		db:       db,
+		statuses: make(map[uuid.UUID]*SyncStatus),
+		stopCh:   make(chan struct{}),
+	}
+}
+
+// GetStatus returns the last sync status for a tenant.
+func (s *CalDAVService) GetStatus(tenantID uuid.UUID) *SyncStatus {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return s.statuses[tenantID]
+}
+
+// setStatus stores the sync status for a tenant.
+func (s *CalDAVService) setStatus(status *SyncStatus) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.statuses[status.TenantID] = status
+}
+
+// Start begins the background sync goroutine that polls per-tenant.
+func (s *CalDAVService) Start() {
+	s.wg.Go(func() {
+		s.backgroundLoop()
+	})
+	log.Println("CalDAV sync service started")
+}
+
+// Stop gracefully stops the background sync.
+func (s *CalDAVService) Stop() {
+	close(s.stopCh)
+	s.wg.Wait()
+	log.Println("CalDAV sync service stopped")
+}
+
+// backgroundLoop polls tenants at their configured interval.
+func (s *CalDAVService) backgroundLoop() {
+	// Check every minute, but only sync tenants whose interval has elapsed.
+	ticker := time.NewTicker(1 * time.Minute)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-s.stopCh:
+			return
+		case <-ticker.C:
+			s.syncAllTenants()
+		}
+	}
+}
+
+// syncAllTenants checks all tenants and syncs those due for a sync.
+func (s *CalDAVService) syncAllTenants() {
+	configs, err := s.loadAllTenantConfigs()
+	if err != nil {
+		log.Printf("CalDAV: failed to load tenant configs: %v", err)
+		return
+	}
+
+	for tenantID, cfg := range configs {
+		if !cfg.SyncEnabled {
+			continue
+		}
+
+		interval := cfg.SyncIntervalMinutes
+		if interval <= 0 {
+			interval = defaultSyncMin
+		}
+
+		// Check if enough time has passed since last sync
+		status := s.GetStatus(tenantID)
+		if status != nil && time.Since(status.LastSyncAt) < time.Duration(interval)*time.Minute {
+			continue
+		}
+
+		go func(tid uuid.UUID, c CalDAVConfig) {
+			ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
+			defer cancel()
+			if _, err := s.SyncTenant(ctx, tid, c); err != nil {
+				log.Printf("CalDAV: sync failed for tenant %s: %v", tid, err)
+			}
+		}(tenantID, cfg)
+	}
+}
+
+// loadAllTenantConfigs reads CalDAV configs from all tenants.
+func (s *CalDAVService) loadAllTenantConfigs() (map[uuid.UUID]CalDAVConfig, error) {
+	type row struct {
+		ID       uuid.UUID       `db:"id"`
+		Settings json.RawMessage `db:"settings"`
+	}
+	var rows []row
+	if err := s.db.Select(&rows, "SELECT id, settings FROM tenants"); err != nil {
+		return nil, fmt.Errorf("querying tenants: %w", err)
+	}
+
+	result := make(map[uuid.UUID]CalDAVConfig)
+	for _, r := range rows {
+		cfg, err := parseCalDAVConfig(r.Settings)
+		if err != nil || cfg.URL == "" {
+			continue
+		}
+		result[r.ID] = cfg
+	}
+	return result, nil
+}
+
+// LoadTenantConfig reads CalDAV config for a single tenant.
+func (s *CalDAVService) LoadTenantConfig(tenantID uuid.UUID) (*CalDAVConfig, error) {
+	var settings json.RawMessage
+	if err := s.db.Get(&settings, "SELECT settings FROM tenants WHERE id = $1", tenantID); err != nil {
+		return nil, fmt.Errorf("loading tenant settings: %w", err)
+	}
+	cfg, err := parseCalDAVConfig(settings)
+	if err != nil {
+		return nil, err
+	}
+	if cfg.URL == "" {
+		return nil, fmt.Errorf("no CalDAV configuration for tenant")
+	}
+	return &cfg, nil
+}
+
+func parseCalDAVConfig(settings json.RawMessage) (CalDAVConfig, error) {
+	if len(settings) == 0 {
+		return CalDAVConfig{}, nil
+	}
+	var wrapper struct {
+		CalDAV CalDAVConfig `json:"caldav"`
+	}
+	if err := json.Unmarshal(settings, &wrapper); err != nil {
+		return CalDAVConfig{}, fmt.Errorf("parsing CalDAV settings: %w", err)
+	}
+	return wrapper.CalDAV, nil
+}
+
+// newCalDAVClient creates a caldav.Client from config.
+func newCalDAVClient(cfg CalDAVConfig) (*caldav.Client, error) {
+	httpClient := webdav.HTTPClientWithBasicAuth(nil, cfg.Username, cfg.Password)
+	return caldav.NewClient(httpClient, cfg.URL)
+}
+
+// SyncTenant performs a full bidirectional sync for a tenant.
+func (s *CalDAVService) SyncTenant(ctx context.Context, tenantID uuid.UUID, cfg CalDAVConfig) (*SyncStatus, error) {
+	start := time.Now()
+	status := &SyncStatus{
+		TenantID: tenantID,
+	}
+
+	client, err := newCalDAVClient(cfg)
+	if err != nil {
+		status.Errors = append(status.Errors, fmt.Sprintf("creating client: %v", err))
+		status.LastSyncAt = time.Now()
+		s.setStatus(status)
+		return status, err
+	}
+
+	// Push local changes to CalDAV
+	pushed, pushErrs := s.pushAll(ctx, client, tenantID, cfg)
+	status.ItemsPushed = pushed
+	status.Errors = append(status.Errors, pushErrs...)
+
+	// Pull remote changes from CalDAV
+	pulled, pullErrs := s.pullAll(ctx, client, tenantID, cfg)
+	status.ItemsPulled = pulled
+	status.Errors = append(status.Errors, pullErrs...)
+
+	status.LastSyncAt = time.Now()
+	status.SyncDuration = time.Since(start).String()
+	s.setStatus(status)
+
+	if len(status.Errors) > 0 {
+		return status, fmt.Errorf("sync completed with %d errors", len(status.Errors))
+	}
+	return status, nil
+}
+
+// --- Push: Local -> CalDAV ---
+
+// pushAll pushes all deadlines and appointments to CalDAV.
+func (s *CalDAVService) pushAll(ctx context.Context, client *caldav.Client, tenantID uuid.UUID, cfg CalDAVConfig) (int, []string) {
+	var pushed int
+	var errs []string
+
+	// Push deadlines as VTODO
+	deadlines, err := s.loadDeadlines(tenantID)
+	if err != nil {
+		return 0, []string{fmt.Sprintf("loading deadlines: %v", err)}
+	}
+	for _, d := range deadlines {
+		if err := s.pushDeadline(ctx, client, cfg, &d); err != nil {
+			errs = append(errs, fmt.Sprintf("push deadline %s: %v", d.ID, err))
+		} else {
+			pushed++
+		}
+	}
+
+	// Push appointments as VEVENT
+	appointments, err := s.loadAppointments(ctx, tenantID)
+	if err != nil {
+		errs = append(errs, fmt.Sprintf("loading appointments: %v", err))
+		return pushed, errs
+	}
+	for _, a := range appointments {
+		if err := s.pushAppointment(ctx, client, cfg, &a); err != nil {
+			errs = append(errs, fmt.Sprintf("push appointment %s: %v", a.ID, err))
+		} else {
+			pushed++
+		}
+	}
+
+	return pushed, errs
+}
+
+// PushDeadline pushes a single deadline to CalDAV (called on create/update).
+func (s *CalDAVService) PushDeadline(ctx context.Context, tenantID uuid.UUID, deadline *models.Deadline) error {
+	cfg, err := s.LoadTenantConfig(tenantID)
+	if err != nil || !cfg.SyncEnabled {
+		return nil // CalDAV not configured or disabled — silently skip
+	}
+	client, err := newCalDAVClient(*cfg)
+	if err != nil {
+		return fmt.Errorf("creating CalDAV client: %w", err)
+	}
+	return s.pushDeadline(ctx, client, *cfg, deadline)
+}
+
+func (s *CalDAVService) pushDeadline(ctx context.Context, client *caldav.Client, cfg CalDAVConfig, d *models.Deadline) error {
+	uid := deadlineUID(d.ID)
+
+	cal := ical.NewCalendar()
+	cal.Props.SetText(ical.PropProductID, calDAVProdID)
+	cal.Props.SetText(ical.PropVersion, "2.0")
+
+	todo := ical.NewComponent(ical.CompToDo)
+	todo.Props.SetText(ical.PropUID, uid)
+	todo.Props.SetText(ical.PropSummary, d.Title)
+	todo.Props.SetDateTime(ical.PropDateTimeStamp, time.Now().UTC())
+
+	if d.Description != nil {
+		todo.Props.SetText(ical.PropDescription, *d.Description)
+	}
+	if d.Notes != nil {
+		desc := ""
+		if d.Description != nil {
+			desc = *d.Description + "\n\n"
+		}
+		todo.Props.SetText(ical.PropDescription, desc+*d.Notes)
+	}
+
+	// Parse due_date (stored as string "YYYY-MM-DD")
+	if due, err := time.Parse("2006-01-02", d.DueDate); err == nil {
+		todo.Props.SetDate(ical.PropDue, due)
+	}
+
+	// Map status
+	switch d.Status {
+	case "completed":
+		todo.Props.SetText(ical.PropStatus, "COMPLETED")
+		if d.CompletedAt != nil {
+			todo.Props.SetDateTime(ical.PropCompleted, d.CompletedAt.UTC())
+		}
+	case "pending":
+		todo.Props.SetText(ical.PropStatus, "NEEDS-ACTION")
+	default:
+		todo.Props.SetText(ical.PropStatus, "IN-PROCESS")
+	}
+
+	cal.Children = append(cal.Children, todo)
+
+	path := calendarObjectPath(cfg.CalendarPath, uid)
+	obj, err := client.PutCalendarObject(ctx, path, cal)
+	if err != nil {
+		return fmt.Errorf("putting VTODO: %w", err)
+	}
+
+	// Update caldav_uid and etag in DB
+	return s.updateDeadlineCalDAV(d.ID, uid, obj.ETag)
+}
+
+// PushAppointment pushes a single appointment to CalDAV (called on create/update).
+func (s *CalDAVService) PushAppointment(ctx context.Context, tenantID uuid.UUID, appointment *models.Appointment) error {
+	cfg, err := s.LoadTenantConfig(tenantID)
+	if err != nil || !cfg.SyncEnabled {
+		return nil
+	}
+	client, err := newCalDAVClient(*cfg)
+	if err != nil {
+		return fmt.Errorf("creating CalDAV client: %w", err)
+	}
+	return s.pushAppointment(ctx, client, *cfg, appointment)
+}
+
+func (s *CalDAVService) pushAppointment(ctx context.Context, client *caldav.Client, cfg CalDAVConfig, a *models.Appointment) error {
+	uid := appointmentUID(a.ID)
+
+	cal := ical.NewCalendar()
+	cal.Props.SetText(ical.PropProductID, calDAVProdID)
+	cal.Props.SetText(ical.PropVersion, "2.0")
+
+	event := ical.NewEvent()
+	event.Props.SetText(ical.PropUID, uid)
+	event.Props.SetText(ical.PropSummary, a.Title)
+	event.Props.SetDateTime(ical.PropDateTimeStamp, time.Now().UTC())
+	event.Props.SetDateTime(ical.PropDateTimeStart, a.StartAt.UTC())
+
+	if a.EndAt != nil {
+		event.Props.SetDateTime(ical.PropDateTimeEnd, a.EndAt.UTC())
+	}
+	if a.Description != nil {
+		event.Props.SetText(ical.PropDescription, *a.Description)
+	}
+	if a.Location != nil {
+		event.Props.SetText(ical.PropLocation, *a.Location)
+	}
+
+	cal.Children = append(cal.Children, event.Component)
+
+	path := calendarObjectPath(cfg.CalendarPath, uid)
+	obj, err := client.PutCalendarObject(ctx, path, cal)
+	if err != nil {
+		return fmt.Errorf("putting VEVENT: %w", err)
+	}
+
+	return s.updateAppointmentCalDAV(a.ID, uid, obj.ETag)
+}
+
+// DeleteDeadlineCalDAV removes a deadline's VTODO from CalDAV.
+func (s *CalDAVService) DeleteDeadlineCalDAV(ctx context.Context, tenantID uuid.UUID, deadline *models.Deadline) error {
+	if deadline.CalDAVUID == nil || *deadline.CalDAVUID == "" {
+		return nil
+	}
+	cfg, err := s.LoadTenantConfig(tenantID)
+	if err != nil || !cfg.SyncEnabled {
+		return nil
+	}
+	client, err := newCalDAVClient(*cfg)
+	if err != nil {
+		return fmt.Errorf("creating CalDAV client: %w", err)
+	}
+	path := calendarObjectPath(cfg.CalendarPath, *deadline.CalDAVUID)
+	return client.RemoveAll(ctx, path)
+}
+
+// DeleteAppointmentCalDAV removes an appointment's VEVENT from CalDAV.
+func (s *CalDAVService) DeleteAppointmentCalDAV(ctx context.Context, tenantID uuid.UUID, appointment *models.Appointment) error {
+	if appointment.CalDAVUID == nil || *appointment.CalDAVUID == "" {
+		return nil
+	}
+	cfg, err := s.LoadTenantConfig(tenantID)
+	if err != nil || !cfg.SyncEnabled {
+		return nil
+	}
+	client, err := newCalDAVClient(*cfg)
+	if err != nil {
+		return fmt.Errorf("creating CalDAV client: %w", err)
+	}
+	path := calendarObjectPath(cfg.CalendarPath, *appointment.CalDAVUID)
+	return client.RemoveAll(ctx, path)
+}
+
+// --- Pull: CalDAV -> Local ---
+
+// pullAll fetches all calendar objects from CalDAV and reconciles with local DB.
+func (s *CalDAVService) pullAll(ctx context.Context, client *caldav.Client, tenantID uuid.UUID, cfg CalDAVConfig) (int, []string) {
+	var pulled int
+	var errs []string
+
+	query := &caldav.CalendarQuery{
+		CompFilter: caldav.CompFilter{
+			Name: ical.CompCalendar,
+		},
+	}
+
+	objects, err := client.QueryCalendar(ctx, cfg.CalendarPath, query)
+	if err != nil {
+		return 0, []string{fmt.Sprintf("querying calendar: %v", err)}
+	}
+
+	for _, obj := range objects {
+		if obj.Data == nil {
+			continue
+		}
+
+		for _, child := range obj.Data.Children {
+			switch child.Name {
+			case ical.CompToDo:
+				uid, _ := child.Props.Text(ical.PropUID)
+				if uid == "" || !isKanzlAIUID(uid, "deadline") {
+					continue
+				}
+				if err := s.reconcileDeadline(ctx, tenantID, child, obj.ETag); err != nil {
+					errs = append(errs, fmt.Sprintf("reconcile deadline %s: %v", uid, err))
+				} else {
+					pulled++
+				}
+			case ical.CompEvent:
+				uid, _ := child.Props.Text(ical.PropUID)
+				if uid == "" || !isKanzlAIUID(uid, "appointment") {
+					continue
+				}
+				if err := s.reconcileAppointment(ctx, tenantID, child, obj.ETag); err != nil {
+					errs = append(errs, fmt.Sprintf("reconcile appointment %s: %v", uid, err))
+				} else {
+					pulled++
+				}
+			}
+		}
+	}
+
+	return pulled, errs
+}
+
+// reconcileDeadline handles conflict resolution for a pulled VTODO.
+// KanzlAI wins for dates/status, CalDAV wins for notes/description.
+func (s *CalDAVService) reconcileDeadline(ctx context.Context, tenantID uuid.UUID, comp *ical.Component, remoteEtag string) error {
+	uid, _ := comp.Props.Text(ical.PropUID)
+	deadlineID := extractIDFromUID(uid, "deadline")
+	if deadlineID == uuid.Nil {
+		return fmt.Errorf("invalid UID: %s", uid)
+	}
+
+	// Load existing deadline
+	var d models.Deadline
+	err := s.db.Get(&d, `SELECT id, tenant_id, case_id, title, description, due_date, original_due_date,
+		warning_date, source, rule_id, status, completed_at,
+		caldav_uid, caldav_etag, notes, created_at, updated_at
+		FROM deadlines WHERE id = $1 AND tenant_id = $2`, deadlineID, tenantID)
+	if err != nil {
+		return fmt.Errorf("loading deadline: %w", err)
+	}
+
+	// Check if remote changed (etag mismatch)
+	if d.CalDAVEtag != nil && *d.CalDAVEtag == remoteEtag {
+		return nil // No change
+	}
+
+	// CalDAV wins for description/notes
+	description, _ := comp.Props.Text(ical.PropDescription)
+	hasConflict := false
+
+	if description != "" {
+		existingDesc := ""
+		if d.Description != nil {
+			existingDesc = *d.Description
+		}
+		existingNotes := ""
+		if d.Notes != nil {
+			existingNotes = *d.Notes
+		}
+		// CalDAV wins for notes/description
+		if description != existingDesc && description != existingNotes {
+			hasConflict = true
+			_, err = s.db.Exec(`UPDATE deadlines SET notes = $1, caldav_etag = $2, updated_at = NOW()
+				WHERE id = $3 AND tenant_id = $4`, description, remoteEtag, deadlineID, tenantID)
+			if err != nil {
+				return fmt.Errorf("updating deadline notes: %w", err)
+			}
+		}
+	}
+
+	if !hasConflict {
+		// Just update etag
+		_, err = s.db.Exec(`UPDATE deadlines SET caldav_etag = $1, updated_at = NOW()
+			WHERE id = $2 AND tenant_id = $3`, remoteEtag, deadlineID, tenantID)
+		if err != nil {
+			return fmt.Errorf("updating deadline etag: %w", err)
+		}
+	}
+
+	// Log conflict in case_events if detected
+	if hasConflict {
+		s.logConflictEvent(ctx, tenantID, d.CaseID, "deadline", deadlineID, "CalDAV description updated from remote")
+	}
+
+	return nil
+}
+
+// reconcileAppointment handles conflict resolution for a pulled VEVENT.
+func (s *CalDAVService) reconcileAppointment(ctx context.Context, tenantID uuid.UUID, comp *ical.Component, remoteEtag string) error {
+	uid, _ := comp.Props.Text(ical.PropUID)
+	appointmentID := extractIDFromUID(uid, "appointment")
+	if appointmentID == uuid.Nil {
+		return fmt.Errorf("invalid UID: %s", uid)
+	}
+
+	var a models.Appointment
+	err := s.db.GetContext(ctx, &a, `SELECT * FROM appointments WHERE id = $1 AND tenant_id = $2`, appointmentID, tenantID)
+	if err != nil {
+		return fmt.Errorf("loading appointment: %w", err)
+	}
+
+	if a.CalDAVEtag != nil && *a.CalDAVEtag == remoteEtag {
+		return nil
+	}
+
+	// CalDAV wins for description
+	description, _ := comp.Props.Text(ical.PropDescription)
+	location, _ := comp.Props.Text(ical.PropLocation)
+	hasConflict := false
+
+	updates := []string{"caldav_etag = $1", "updated_at = NOW()"}
+	args := []any{remoteEtag}
+	argN := 2
+
+	if description != "" {
+		existingDesc := ""
+		if a.Description != nil {
+			existingDesc = *a.Description
+		}
+		if description != existingDesc {
+			hasConflict = true
+			updates = append(updates, fmt.Sprintf("description = $%d", argN))
+			args = append(args, description)
+			argN++
+		}
+	}
+	if location != "" {
+		existingLoc := ""
+		if a.Location != nil {
+			existingLoc = *a.Location
+		}
+		if location != existingLoc {
+			hasConflict = true
+			updates = append(updates, fmt.Sprintf("location = $%d", argN))
+			args = append(args, location)
+			argN++
+		}
+	}
+
+	args = append(args, appointmentID, tenantID)
+	query := fmt.Sprintf("UPDATE appointments SET %s WHERE id = $%d AND tenant_id = $%d",
+		strings.Join(updates, ", "), argN, argN+1)
+
+	if _, err := s.db.ExecContext(ctx, query, args...); err != nil {
+		return fmt.Errorf("updating appointment: %w", err)
+	}
+
+	if hasConflict {
+		caseID := uuid.Nil
+		if a.CaseID != nil {
+			caseID = *a.CaseID
+		}
+		s.logConflictEvent(ctx, tenantID, caseID, "appointment", appointmentID, "CalDAV description/location updated from remote")
+	}
+
+	return nil
+}
+
+// --- DB helpers ---
+
+func (s *CalDAVService) loadDeadlines(tenantID uuid.UUID) ([]models.Deadline, error) {
+	var deadlines []models.Deadline
+	err := s.db.Select(&deadlines, `SELECT id, tenant_id, case_id, title, description, due_date,
+		original_due_date, warning_date, source, rule_id, status, completed_at,
+		caldav_uid, caldav_etag, notes, created_at, updated_at
+		FROM deadlines WHERE tenant_id = $1`, tenantID)
+	return deadlines, err
+}
+
+func (s *CalDAVService) loadAppointments(ctx context.Context, tenantID uuid.UUID) ([]models.Appointment, error) {
+	var appointments []models.Appointment
+	err := s.db.SelectContext(ctx, &appointments, "SELECT * FROM appointments WHERE tenant_id = $1", tenantID)
+	return appointments, err
+}
+
+func (s *CalDAVService) updateDeadlineCalDAV(id uuid.UUID, calDAVUID, etag string) error {
+	_, err := s.db.Exec(`UPDATE deadlines SET caldav_uid = $1, caldav_etag = $2, updated_at = NOW()
+		WHERE id = $3`, calDAVUID, etag, id)
+	return err
+}
+
+func (s *CalDAVService) updateAppointmentCalDAV(id uuid.UUID, calDAVUID, etag string) error {
+	_, err := s.db.Exec(`UPDATE appointments SET caldav_uid = $1, caldav_etag = $2, updated_at = NOW()
+		WHERE id = $3`, calDAVUID, etag, id)
+	return err
+}
+
+func (s *CalDAVService) logConflictEvent(ctx context.Context, tenantID, caseID uuid.UUID, objectType string, objectID uuid.UUID, msg string) {
+	if caseID == uuid.Nil {
+		return
+	}
+	metadata, _ := json.Marshal(map[string]string{
+		"object_type": objectType,
+		"object_id":   objectID.String(),
+		"source":      "caldav_sync",
+	})
+	_, err := s.db.ExecContext(ctx, `INSERT INTO case_events (id, tenant_id, case_id, event_type, title, description, metadata, created_at, updated_at)
+		VALUES ($1, $2, $3, 'caldav_conflict', $4, $5, $6, NOW(), NOW())`,
+		uuid.New(), tenantID, caseID, "CalDAV sync conflict", msg, metadata)
+	if err != nil {
+		log.Printf("CalDAV: failed to log conflict event: %v", err)
+	}
+}
+
+// --- UID helpers ---
+
+func deadlineUID(id uuid.UUID) string {
+	return fmt.Sprintf("kanzlai-deadline-%s@%s", id, calDAVDomain)
+}
+
+func appointmentUID(id uuid.UUID) string {
+	return fmt.Sprintf("kanzlai-appointment-%s@%s", id, calDAVDomain)
+}
+
+func isKanzlAIUID(uid, objectType string) bool {
+	return strings.HasPrefix(uid, "kanzlai-"+objectType+"-") && strings.HasSuffix(uid, "@"+calDAVDomain)
+}
+
+func extractIDFromUID(uid, objectType string) uuid.UUID {
+	prefix := "kanzlai-" + objectType + "-"
+	suffix := "@" + calDAVDomain
+	if !strings.HasPrefix(uid, prefix) || !strings.HasSuffix(uid, suffix) {
+		return uuid.Nil
+	}
+	idStr := uid[len(prefix) : len(uid)-len(suffix)]
+	id, err := uuid.Parse(idStr)
+	if err != nil {
+		return uuid.Nil
+	}
+	return id
+}
+
+func calendarObjectPath(calendarPath, uid string) string {
+	path := strings.TrimSuffix(calendarPath, "/")
+	return path + "/" + uid + ".ics"
+}

backend/internal/services/caldav_service_test.go

@@ -0,0 +1,124 @@
+package services
+
+import (
+	"testing"
+
+	"github.com/google/uuid"
+)
+
+func TestDeadlineUID(t *testing.T) {
+	id := uuid.MustParse("550e8400-e29b-41d4-a716-446655440000")
+	uid := deadlineUID(id)
+	want := "kanzlai-deadline-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de"
+	if uid != want {
+		t.Errorf("deadlineUID = %q, want %q", uid, want)
+	}
+}
+
+func TestAppointmentUID(t *testing.T) {
+	id := uuid.MustParse("550e8400-e29b-41d4-a716-446655440000")
+	uid := appointmentUID(id)
+	want := "kanzlai-appointment-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de"
+	if uid != want {
+		t.Errorf("appointmentUID = %q, want %q", uid, want)
+	}
+}
+
+func TestIsKanzlAIUID(t *testing.T) {
+	tests := []struct {
+		uid        string
+		objectType string
+		want       bool
+	}{
+		{"kanzlai-deadline-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de", "deadline", true},
+		{"kanzlai-appointment-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de", "appointment", true},
+		{"kanzlai-deadline-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de", "appointment", false},
+		{"random-uid@other.com", "deadline", false},
+		{"", "deadline", false},
+	}
+	for _, tt := range tests {
+		got := isKanzlAIUID(tt.uid, tt.objectType)
+		if got != tt.want {
+			t.Errorf("isKanzlAIUID(%q, %q) = %v, want %v", tt.uid, tt.objectType, got, tt.want)
+		}
+	}
+}
+
+func TestExtractIDFromUID(t *testing.T) {
+	id := uuid.MustParse("550e8400-e29b-41d4-a716-446655440000")
+
+	tests := []struct {
+		uid        string
+		objectType string
+		want       uuid.UUID
+	}{
+		{"kanzlai-deadline-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de", "deadline", id},
+		{"kanzlai-appointment-550e8400-e29b-41d4-a716-446655440000@kanzlai.msbls.de", "appointment", id},
+		{"invalid-uid", "deadline", uuid.Nil},
+		{"kanzlai-deadline-not-a-uuid@kanzlai.msbls.de", "deadline", uuid.Nil},
+	}
+	for _, tt := range tests {
+		got := extractIDFromUID(tt.uid, tt.objectType)
+		if got != tt.want {
+			t.Errorf("extractIDFromUID(%q, %q) = %v, want %v", tt.uid, tt.objectType, got, tt.want)
+		}
+	}
+}
+
+func TestCalendarObjectPath(t *testing.T) {
+	tests := []struct {
+		calendarPath string
+		uid          string
+		want         string
+	}{
+		{"/dav/calendars/user/cal", "kanzlai-deadline-abc@kanzlai.msbls.de", "/dav/calendars/user/cal/kanzlai-deadline-abc@kanzlai.msbls.de.ics"},
+		{"/dav/calendars/user/cal/", "kanzlai-deadline-abc@kanzlai.msbls.de", "/dav/calendars/user/cal/kanzlai-deadline-abc@kanzlai.msbls.de.ics"},
+	}
+	for _, tt := range tests {
+		got := calendarObjectPath(tt.calendarPath, tt.uid)
+		if got != tt.want {
+			t.Errorf("calendarObjectPath(%q, %q) = %q, want %q", tt.calendarPath, tt.uid, got, tt.want)
+		}
+	}
+}
+
+func TestParseCalDAVConfig(t *testing.T) {
+	settings := []byte(`{"caldav": {"url": "https://dav.example.com", "username": "user", "password": "pass", "calendar_path": "/cal", "sync_enabled": true, "sync_interval_minutes": 30}}`)
+	cfg, err := parseCalDAVConfig(settings)
+	if err != nil {
+		t.Fatalf("parseCalDAVConfig: %v", err)
+	}
+	if cfg.URL != "https://dav.example.com" {
+		t.Errorf("URL = %q, want %q", cfg.URL, "https://dav.example.com")
+	}
+	if cfg.Username != "user" {
+		t.Errorf("Username = %q, want %q", cfg.Username, "user")
+	}
+	if cfg.SyncIntervalMinutes != 30 {
+		t.Errorf("SyncIntervalMinutes = %d, want 30", cfg.SyncIntervalMinutes)
+	}
+	if !cfg.SyncEnabled {
+		t.Error("SyncEnabled = false, want true")
+	}
+}
+
+func TestParseCalDAVConfig_Empty(t *testing.T) {
+	cfg, err := parseCalDAVConfig(nil)
+	if err != nil {
+		t.Fatalf("parseCalDAVConfig(nil): %v", err)
+	}
+	if cfg.URL != "" {
+		t.Errorf("expected empty config, got URL=%q", cfg.URL)
+	}
+}
+
+func TestParseCalDAVConfig_NoCalDAV(t *testing.T) {
+	settings := []byte(`{"other_setting": true}`)
+	cfg, err := parseCalDAVConfig(settings)
+	if err != nil {
+		t.Fatalf("parseCalDAVConfig: %v", err)
+	}
+	if cfg.URL != "" {
+		t.Errorf("expected empty caldav config, got URL=%q", cfg.URL)
+	}
+}

backend/internal/services/deadline_service.go

@@ -21,6 +21,23 @@ func NewDeadlineService(db *sqlx.DB) *DeadlineService {
 	return &DeadlineService{db: db}
 }
 
+// ListAll returns all deadlines for a tenant, ordered by due_date
+func (s *DeadlineService) ListAll(tenantID uuid.UUID) ([]models.Deadline, error) {
+	query := `SELECT id, tenant_id, case_id, title, description, due_date, original_due_date,
+	                 warning_date, source, rule_id, status, completed_at,
+	                 caldav_uid, caldav_etag, notes, created_at, updated_at
+	          FROM deadlines
+	          WHERE tenant_id = $1
+	          ORDER BY due_date ASC`
+
+	var deadlines []models.Deadline
+	err := s.db.Select(&deadlines, query, tenantID)
+	if err != nil {
+		return nil, fmt.Errorf("listing all deadlines: %w", err)
+	}
+	return deadlines, nil
+}
+
 // ListForCase returns all deadlines for a case, scoped to tenant
 func (s *DeadlineService) ListForCase(tenantID, caseID uuid.UUID) ([]models.Deadline, error) {
 	query := `SELECT id, tenant_id, case_id, title, description, due_date, original_due_date,

frontend/src/app/(app)/cases/[id]/page.tsx

@@ -0,0 +1,267 @@
+"use client";
+
+import { useQuery } from "@tanstack/react-query";
+import { useParams } from "next/navigation";
+import { api } from "@/lib/api";
+import type { Case, CaseEvent, Party, Deadline, Document } from "@/lib/types";
+import { CaseTimeline } from "@/components/cases/CaseTimeline";
+import { PartyList } from "@/components/cases/PartyList";
+import { ArrowLeft, Clock, FileText, Users, Activity } from "lucide-react";
+import { format } from "date-fns";
+import { de } from "date-fns/locale";
+import Link from "next/link";
+import { useState } from "react";
+
+interface CaseDetail extends Case {
+  parties: Party[];
+  recent_events: CaseEvent[];
+  deadlines_count: number;
+}
+
+const STATUS_BADGE: Record<string, string> = {
+  active: "bg-emerald-50 text-emerald-700",
+  pending: "bg-amber-50 text-amber-700",
+  closed: "bg-neutral-100 text-neutral-600",
+  archived: "bg-neutral-100 text-neutral-400",
+};
+
+const TABS = [
+  { key: "timeline", label: "Verlauf", icon: Activity },
+  { key: "deadlines", label: "Fristen", icon: Clock },
+  { key: "documents", label: "Dokumente", icon: FileText },
+  { key: "parties", label: "Parteien", icon: Users },
+] as const;
+
+type TabKey = (typeof TABS)[number]["key"];
+
+export default function CaseDetailPage() {
+  const { id } = useParams<{ id: string }>();
+  const [activeTab, setActiveTab] = useState<TabKey>("timeline");
+
+  const { data: caseDetail, isLoading } = useQuery({
+    queryKey: ["case", id],
+    queryFn: () => api.get<CaseDetail>(`/cases/${id}`),
+  });
+
+  const { data: deadlinesData } = useQuery({
+    queryKey: ["case-deadlines", id],
+    queryFn: () =>
+      api.get<{ deadlines: Deadline[]; total: number }>(
+        `/deadlines?case_id=${id}`,
+      ),
+    enabled: activeTab === "deadlines",
+  });
+
+  const { data: documentsData } = useQuery({
+    queryKey: ["case-documents", id],
+    queryFn: () => api.get<Document[]>(`/cases/${id}/documents`),
+    enabled: activeTab === "documents",
+  });
+
+  if (isLoading) {
+    return (
+      <div className="py-12 text-center text-sm text-neutral-400">
+        Laden...
+      </div>
+    );
+  }
+
+  if (!caseDetail) {
+    return (
+      <div className="py-12 text-center text-sm text-neutral-400">
+        Akte nicht gefunden.
+      </div>
+    );
+  }
+
+  const deadlines = deadlinesData?.deadlines ?? [];
+  const documents = documentsData ?? [];
+
+  return (
+    <div>
+      <Link
+        href="/cases"
+        className="mb-4 inline-flex items-center gap-1 text-sm text-neutral-500 hover:text-neutral-700"
+      >
+        <ArrowLeft className="h-3.5 w-3.5" />
+        Zuruck zu Akten
+      </Link>
+
+      <div className="flex items-start justify-between">
+        <div>
+          <div className="flex items-center gap-3">
+            <h1 className="text-lg font-semibold text-neutral-900">
+              {caseDetail.title}
+            </h1>
+            <span
+              className={`inline-block rounded-full px-2 py-0.5 text-xs font-medium ${STATUS_BADGE[caseDetail.status] ?? "bg-neutral-100 text-neutral-500"}`}
+            >
+              {caseDetail.status}
+            </span>
+          </div>
+          <div className="mt-1 flex gap-4 text-sm text-neutral-500">
+            <span>Az. {caseDetail.case_number}</span>
+            {caseDetail.case_type && <span>{caseDetail.case_type}</span>}
+            {caseDetail.court && <span>{caseDetail.court}</span>}
+            {caseDetail.court_ref && <span>({caseDetail.court_ref})</span>}
+          </div>
+        </div>
+        <div className="text-right text-xs text-neutral-400">
+          <p>
+            Erstellt:{" "}
+            {format(new Date(caseDetail.created_at), "d. MMM yyyy", {
+              locale: de,
+            })}
+          </p>
+          <p>
+            Aktualisiert:{" "}
+            {format(new Date(caseDetail.updated_at), "d. MMM yyyy", {
+              locale: de,
+            })}
+          </p>
+        </div>
+      </div>
+
+      {caseDetail.ai_summary && (
+        <div className="mt-4 rounded-md border border-blue-100 bg-blue-50 px-4 py-3 text-sm text-blue-800">
+          {caseDetail.ai_summary}
+        </div>
+      )}
+
+      <div className="mt-6 border-b border-neutral-200">
+        <nav className="-mb-px flex gap-4">
+          {TABS.map((tab) => (
+            <button
+              key={tab.key}
+              onClick={() => setActiveTab(tab.key)}
+              className={`inline-flex items-center gap-1.5 border-b-2 px-1 pb-2.5 text-sm font-medium transition-colors ${
+                activeTab === tab.key
+                  ? "border-neutral-900 text-neutral-900"
+                  : "border-transparent text-neutral-400 hover:text-neutral-600"
+              }`}
+            >
+              <tab.icon className="h-4 w-4" />
+              {tab.label}
+              {tab.key === "deadlines" && caseDetail.deadlines_count > 0 && (
+                <span className="ml-1 rounded-full bg-neutral-100 px-1.5 py-0.5 text-xs text-neutral-500">
+                  {caseDetail.deadlines_count}
+                </span>
+              )}
+              {tab.key === "parties" && caseDetail.parties.length > 0 && (
+                <span className="ml-1 rounded-full bg-neutral-100 px-1.5 py-0.5 text-xs text-neutral-500">
+                  {caseDetail.parties.length}
+                </span>
+              )}
+            </button>
+          ))}
+        </nav>
+      </div>
+
+      <div className="mt-6">
+        {activeTab === "timeline" && (
+          <CaseTimeline events={caseDetail.recent_events ?? []} />
+        )}
+
+        {activeTab === "deadlines" && (
+          <DeadlinesList deadlines={deadlines} />
+        )}
+
+        {activeTab === "documents" && (
+          <DocumentsList documents={documents} />
+        )}
+
+        {activeTab === "parties" && (
+          <PartyList caseId={id} parties={caseDetail.parties ?? []} />
+        )}
+      </div>
+    </div>
+  );
+}
+
+function DeadlinesList({ deadlines }: { deadlines: Deadline[] }) {
+  if (deadlines.length === 0) {
+    return (
+      <p className="py-8 text-center text-sm text-neutral-400">
+        Keine Fristen vorhanden.
+      </p>
+    );
+  }
+
+  const DEADLINE_STATUS: Record<string, string> = {
+    pending: "bg-amber-50 text-amber-700",
+    completed: "bg-emerald-50 text-emerald-700",
+    overdue: "bg-red-50 text-red-700",
+  };
+
+  return (
+    <div className="space-y-2">
+      {deadlines.map((d) => (
+        <div
+          key={d.id}
+          className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3"
+        >
+          <div>
+            <p className="text-sm font-medium text-neutral-900">{d.title}</p>
+            {d.description && (
+              <p className="mt-0.5 text-sm text-neutral-500">
+                {d.description}
+              </p>
+            )}
+          </div>
+          <div className="flex items-center gap-3">
+            <span
+              className={`rounded-full px-2 py-0.5 text-xs font-medium ${DEADLINE_STATUS[d.status] ?? "bg-neutral-100 text-neutral-500"}`}
+            >
+              {d.status}
+            </span>
+            <span className="text-sm text-neutral-500">
+              {format(new Date(d.due_date), "d. MMM yyyy", { locale: de })}
+            </span>
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}
+
+function DocumentsList({ documents }: { documents: Document[] }) {
+  if (documents.length === 0) {
+    return (
+      <p className="py-8 text-center text-sm text-neutral-400">
+        Keine Dokumente vorhanden.
+      </p>
+    );
+  }
+
+  return (
+    <div className="space-y-2">
+      {documents.map((doc) => (
+        <div
+          key={doc.id}
+          className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3"
+        >
+          <div className="flex items-center gap-3">
+            <FileText className="h-4 w-4 text-neutral-400" />
+            <div>
+              <p className="text-sm font-medium text-neutral-900">
+                {doc.title}
+              </p>
+              <div className="flex gap-2 text-xs text-neutral-400">
+                {doc.doc_type && <span>{doc.doc_type}</span>}
+                {doc.file_size && (
+                  <span>{(doc.file_size / 1024).toFixed(0)} KB</span>
+                )}
+              </div>
+            </div>
+          </div>
+          <a
+            href={`/api/documents/${doc.id}`}
+            className="text-sm text-neutral-500 hover:text-neutral-700"
+          >
+            Herunterladen
+          </a>
+        </div>
+      ))}
+    </div>
+  );
+}

frontend/src/app/(app)/cases/new/page.tsx

@@ -0,0 +1,49 @@
+"use client";
+
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { useRouter } from "next/navigation";
+import { toast } from "sonner";
+import { api } from "@/lib/api";
+import type { Case } from "@/lib/types";
+import { CaseForm, type CaseFormData } from "@/components/cases/CaseForm";
+import { ArrowLeft } from "lucide-react";
+import Link from "next/link";
+
+export default function NewCasePage() {
+  const router = useRouter();
+  const queryClient = useQueryClient();
+
+  const mutation = useMutation({
+    mutationFn: (data: CaseFormData) => api.post<Case>("/cases", data),
+    onSuccess: (created) => {
+      queryClient.invalidateQueries({ queryKey: ["cases"] });
+      toast.success("Akte angelegt");
+      router.push(`/cases/${created.id}`);
+    },
+    onError: () => {
+      toast.error("Fehler beim Anlegen der Akte");
+    },
+  });
+
+  return (
+    <div className="mx-auto max-w-2xl">
+      <Link
+        href="/cases"
+        className="mb-4 inline-flex items-center gap-1 text-sm text-neutral-500 hover:text-neutral-700"
+      >
+        <ArrowLeft className="h-3.5 w-3.5" />
+        Zuruck zu Akten
+      </Link>
+      <h1 className="text-lg font-semibold text-neutral-900">Neue Akte</h1>
+      <p className="mt-0.5 text-sm text-neutral-500">
+        Neue Akte im System anlegen
+      </p>
+      <div className="mt-6 rounded-md border border-neutral-200 bg-white p-6">
+        <CaseForm
+          onSubmit={(data) => mutation.mutate(data)}
+          isSubmitting={mutation.isPending}
+        />
+      </div>
+    </div>
+  );
+}

frontend/src/app/(app)/cases/page.tsx

@@ -0,0 +1,172 @@
+"use client";
+
+import { useQuery } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { Case } from "@/lib/types";
+import Link from "next/link";
+import { useSearchParams, useRouter } from "next/navigation";
+import { Plus, Search } from "lucide-react";
+import { useState } from "react";
+
+const STATUS_OPTIONS = [
+  { value: "", label: "Alle Status" },
+  { value: "active", label: "Aktiv" },
+  { value: "pending", label: "Anhangig" },
+  { value: "closed", label: "Geschlossen" },
+  { value: "archived", label: "Archiviert" },
+];
+
+const TYPE_OPTIONS = [
+  { value: "", label: "Alle Typen" },
+  { value: "INF", label: "Verletzungsklage" },
+  { value: "REV", label: "Widerruf" },
+  { value: "CCR", label: "Einstweilige Verfugung" },
+  { value: "APP", label: "Berufung" },
+  { value: "PI", label: "Vorlaufiger Rechtsschutz" },
+  { value: "ZPO_CIVIL", label: "ZPO Zivilverfahren" },
+];
+
+const STATUS_BADGE: Record<string, string> = {
+  active: "bg-emerald-50 text-emerald-700",
+  pending: "bg-amber-50 text-amber-700",
+  closed: "bg-neutral-100 text-neutral-600",
+  archived: "bg-neutral-100 text-neutral-400",
+};
+
+export default function CasesPage() {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+
+  const [search, setSearch] = useState(searchParams.get("search") ?? "");
+  const [status, setStatus] = useState(searchParams.get("status") ?? "");
+  const [type, setType] = useState(searchParams.get("type") ?? "");
+
+  const { data, isLoading } = useQuery({
+    queryKey: ["cases", { search, status, type }],
+    queryFn: () => {
+      const params = new URLSearchParams();
+      if (search) params.set("search", search);
+      if (status) params.set("status", status);
+      if (type) params.set("type", type);
+      params.set("limit", "50");
+      const qs = params.toString();
+      return api.get<{ cases: Case[]; total: number }>(
+        `/cases${qs ? `?${qs}` : ""}`,
+      );
+    },
+  });
+
+  const cases = data?.cases ?? [];
+
+  return (
+    <div>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-lg font-semibold text-neutral-900">Akten</h1>
+          <p className="mt-0.5 text-sm text-neutral-500">
+            {data ? `${data.total} Akten` : "Laden..."}
+          </p>
+        </div>
+        <Link
+          href="/cases/new"
+          className="inline-flex items-center gap-1.5 rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white hover:bg-neutral-800"
+        >
+          <Plus className="h-4 w-4" />
+          Neue Akte
+        </Link>
+      </div>
+
+      <div className="mt-4 flex items-center gap-3">
+        <div className="relative flex-1">
+          <Search className="absolute left-2.5 top-1/2 h-4 w-4 -translate-y-1/2 text-neutral-400" />
+          <input
+            type="text"
+            placeholder="Suchen nach Aktenzeichen, Titel..."
+            value={search}
+            onChange={(e) => setSearch(e.target.value)}
+            className="w-full rounded-md border border-neutral-200 bg-white py-1.5 pl-9 pr-3 text-sm outline-none focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400"
+          />
+        </div>
+        <select
+          value={status}
+          onChange={(e) => setStatus(e.target.value)}
+          className="rounded-md border border-neutral-200 bg-white px-2.5 py-1.5 text-sm outline-none focus:border-neutral-400"
+        >
+          {STATUS_OPTIONS.map((o) => (
+            <option key={o.value} value={o.value}>
+              {o.label}
+            </option>
+          ))}
+        </select>
+        <select
+          value={type}
+          onChange={(e) => setType(e.target.value)}
+          className="rounded-md border border-neutral-200 bg-white px-2.5 py-1.5 text-sm outline-none focus:border-neutral-400"
+        >
+          {TYPE_OPTIONS.map((o) => (
+            <option key={o.value} value={o.value}>
+              {o.label}
+            </option>
+          ))}
+        </select>
+      </div>
+
+      <div className="mt-4">
+        {isLoading ? (
+          <div className="py-12 text-center text-sm text-neutral-400">
+            Laden...
+          </div>
+        ) : cases.length === 0 ? (
+          <div className="py-12 text-center text-sm text-neutral-400">
+            Keine Akten gefunden.
+          </div>
+        ) : (
+          <div className="overflow-hidden rounded-md border border-neutral-200 bg-white">
+            <table className="w-full text-sm">
+              <thead>
+                <tr className="border-b border-neutral-100 text-left text-xs font-medium uppercase tracking-wider text-neutral-400">
+                  <th className="px-4 py-2.5">Aktenzeichen</th>
+                  <th className="px-4 py-2.5">Titel</th>
+                  <th className="px-4 py-2.5">Typ</th>
+                  <th className="px-4 py-2.5">Gericht</th>
+                  <th className="px-4 py-2.5">Status</th>
+                  <th className="px-4 py-2.5">Erstellt</th>
+                </tr>
+              </thead>
+              <tbody className="divide-y divide-neutral-100">
+                {cases.map((c) => (
+                  <tr
+                    key={c.id}
+                    onClick={() => router.push(`/cases/${c.id}`)}
+                    className="cursor-pointer hover:bg-neutral-50"
+                  >
+                    <td className="px-4 py-2.5 font-medium text-neutral-900">
+                      {c.case_number}
+                    </td>
+                    <td className="px-4 py-2.5 text-neutral-700">{c.title}</td>
+                    <td className="px-4 py-2.5 text-neutral-500">
+                      {c.case_type ?? "-"}
+                    </td>
+                    <td className="px-4 py-2.5 text-neutral-500">
+                      {c.court ?? "-"}
+                    </td>
+                    <td className="px-4 py-2.5">
+                      <span
+                        className={`inline-block rounded-full px-2 py-0.5 text-xs font-medium ${STATUS_BADGE[c.status] ?? "bg-neutral-100 text-neutral-500"}`}
+                      >
+                        {c.status}
+                      </span>
+                    </td>
+                    <td className="px-4 py-2.5 text-neutral-400">
+                      {new Date(c.created_at).toLocaleDateString("de-DE")}
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

frontend/src/app/(app)/dashboard/page.tsx

@@ -0,0 +1,69 @@
+"use client";
+
+import { useQuery } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { DashboardData } from "@/lib/types";
+import { DeadlineTrafficLights } from "@/components/dashboard/DeadlineTrafficLights";
+import { CaseOverviewGrid } from "@/components/dashboard/CaseOverviewGrid";
+import { UpcomingTimeline } from "@/components/dashboard/UpcomingTimeline";
+import { AISummaryCard } from "@/components/dashboard/AISummaryCard";
+import { QuickActions } from "@/components/dashboard/QuickActions";
+import { Loader2 } from "lucide-react";
+
+export default function DashboardPage() {
+  const { data, isLoading, error } = useQuery({
+    queryKey: ["dashboard"],
+    queryFn: () => api.get<DashboardData>("/dashboard"),
+    refetchInterval: 60_000,
+  });
+
+  if (isLoading) {
+    return (
+      <div className="flex h-full items-center justify-center">
+        <Loader2 className="h-6 w-6 animate-spin text-neutral-400" />
+      </div>
+    );
+  }
+
+  if (error || !data) {
+    return (
+      <div className="flex h-full items-center justify-center">
+        <p className="text-sm text-neutral-500">
+          Dashboard konnte nicht geladen werden.
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="mx-auto max-w-6xl space-y-6">
+      <div>
+        <h1 className="text-lg font-semibold text-neutral-900">Dashboard</h1>
+        <p className="mt-0.5 text-sm text-neutral-500">
+          Fristenübersicht und Kanzlei-Status
+        </p>
+      </div>
+
+      {/* Traffic Lights — the hero section */}
+      <DeadlineTrafficLights data={data.deadline_summary} />
+
+      {/* Main content grid */}
+      <div className="grid grid-cols-1 gap-6 lg:grid-cols-3">
+        {/* Left column: Timeline (takes 2 cols) */}
+        <div className="lg:col-span-2">
+          <UpcomingTimeline
+            deadlines={data.upcoming_deadlines}
+            appointments={data.upcoming_appointments}
+          />
+        </div>
+
+        {/* Right column: Case overview, AI summary, Quick actions */}
+        <div className="space-y-6">
+          <CaseOverviewGrid data={data.case_summary} />
+          <AISummaryCard data={data} />
+          <QuickActions />
+        </div>
+      </div>
+    </div>
+  );
+}

frontend/src/app/(app)/fristen/page.tsx

@@ -0,0 +1,73 @@
+"use client";
+
+import { DeadlineList } from "@/components/deadlines/DeadlineList";
+import { DeadlineCalendarView } from "@/components/deadlines/DeadlineCalendarView";
+import { useQuery } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { Deadline } from "@/lib/types";
+import { Calendar, List, Calculator } from "lucide-react";
+import Link from "next/link";
+import { useState } from "react";
+
+type ViewMode = "list" | "calendar";
+
+export default function FristenPage() {
+  const [view, setView] = useState<ViewMode>("list");
+
+  const { data: deadlines } = useQuery({
+    queryKey: ["deadlines"],
+    queryFn: () => api.get<Deadline[]>("/api/deadlines"),
+  });
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-lg font-semibold text-neutral-900">Fristen</h1>
+          <p className="mt-0.5 text-sm text-neutral-500">
+            Alle Fristen im Uberblick
+          </p>
+        </div>
+        <div className="flex items-center gap-2">
+          <Link
+            href="/fristen/rechner"
+            className="flex items-center gap-1.5 rounded-md border border-neutral-200 bg-white px-3 py-1.5 text-sm text-neutral-700 transition-colors hover:bg-neutral-50"
+          >
+            <Calculator className="h-3.5 w-3.5" />
+            Fristenrechner
+          </Link>
+          <div className="flex rounded-md border border-neutral-200 bg-white">
+            <button
+              onClick={() => setView("list")}
+              className={`flex items-center gap-1 rounded-l-md px-2.5 py-1.5 text-sm transition-colors ${
+                view === "list"
+                  ? "bg-neutral-100 font-medium text-neutral-900"
+                  : "text-neutral-500 hover:text-neutral-700"
+              }`}
+            >
+              <List className="h-3.5 w-3.5" />
+              Liste
+            </button>
+            <button
+              onClick={() => setView("calendar")}
+              className={`flex items-center gap-1 rounded-r-md px-2.5 py-1.5 text-sm transition-colors ${
+                view === "calendar"
+                  ? "bg-neutral-100 font-medium text-neutral-900"
+                  : "text-neutral-500 hover:text-neutral-700"
+              }`}
+            >
+              <Calendar className="h-3.5 w-3.5" />
+              Kalender
+            </button>
+          </div>
+        </div>
+      </div>
+
+      {view === "list" ? (
+        <DeadlineList />
+      ) : (
+        <DeadlineCalendarView deadlines={deadlines || []} />
+      )}
+    </div>
+  );
+}

frontend/src/app/(app)/fristen/rechner/page.tsx

@@ -0,0 +1,26 @@
+"use client";
+
+import { DeadlineCalculator } from "@/components/deadlines/DeadlineCalculator";
+import { ArrowLeft } from "lucide-react";
+import Link from "next/link";
+
+export default function FristenrechnerPage() {
+  return (
+    <div className="space-y-4">
+      <div>
+        <Link
+          href="/fristen"
+          className="mb-2 inline-flex items-center gap-1 text-sm text-neutral-500 hover:text-neutral-700"
+        >
+          <ArrowLeft className="h-3.5 w-3.5" />
+          Zuruck 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 Auslosedatum
+        </p>
+      </div>
+      <DeadlineCalculator />
+    </div>
+  );
+}

frontend/src/app/(app)/page.tsx

@@ -1,10 +1,5 @@
-export default function DashboardPage() {
-  return (
-    <div>
-      <h1 className="text-lg font-semibold text-neutral-900">Dashboard</h1>
-      <p className="mt-1 text-sm text-neutral-500">
-        Willkommen bei KanzlAI
-      </p>
-    </div>
-  );
+import { redirect } from "next/navigation";
+
+export default function RootPage() {
+  redirect("/dashboard");
 }

frontend/src/app/globals.css

@@ -9,3 +9,18 @@ body {
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
+
+@keyframes count-up {
+  0% {
+    transform: translateY(8px);
+    opacity: 0;
+  }
+  100% {
+    transform: translateY(0);
+    opacity: 1;
+  }
+}
+
+.animate-count-up {
+  animation: count-up 0.3s ease-out;
+}

frontend/src/components/cases/CaseForm.tsx

@@ -0,0 +1,165 @@
+"use client";
+
+import { useState } from "react";
+
+const TYPE_OPTIONS = [
+  { value: "", label: "-- Typ wahlen --" },
+  { value: "INF", label: "Verletzungsklage (INF)" },
+  { value: "REV", label: "Widerruf (REV)" },
+  { value: "CCR", label: "Einstweilige Verfugung (CCR)" },
+  { value: "APP", label: "Berufung (APP)" },
+  { value: "PI", label: "Vorlaufiger Rechtsschutz (PI)" },
+  { value: "ZPO_CIVIL", label: "ZPO Zivilverfahren" },
+];
+
+export interface CaseFormData {
+  case_number: string;
+  title: string;
+  case_type?: string;
+  court?: string;
+  court_ref?: string;
+  status: string;
+}
+
+interface CaseFormProps {
+  initialData?: Partial<CaseFormData>;
+  onSubmit: (data: CaseFormData) => void;
+  isSubmitting?: boolean;
+  submitLabel?: string;
+}
+
+export function CaseForm({
+  initialData,
+  onSubmit,
+  isSubmitting,
+  submitLabel = "Akte anlegen",
+}: CaseFormProps) {
+  const [form, setForm] = useState<CaseFormData>({
+    case_number: initialData?.case_number ?? "",
+    title: initialData?.title ?? "",
+    case_type: initialData?.case_type ?? "",
+    court: initialData?.court ?? "",
+    court_ref: initialData?.court_ref ?? "",
+    status: initialData?.status ?? "active",
+  });
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    const data: CaseFormData = {
+      ...form,
+      case_type: form.case_type || undefined,
+      court: form.court || undefined,
+      court_ref: form.court_ref || undefined,
+    };
+    onSubmit(data);
+  }
+
+  function update(field: keyof CaseFormData, value: string) {
+    setForm((prev) => ({ ...prev, [field]: value }));
+  }
+
+  const inputClass =
+    "w-full rounded-md border border-neutral-200 bg-white px-3 py-1.5 text-sm outline-none focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4">
+      <div className="grid grid-cols-2 gap-4">
+        <div>
+          <label className="mb-1 block text-sm font-medium text-neutral-700">
+            Aktenzeichen *
+          </label>
+          <input
+            type="text"
+            required
+            value={form.case_number}
+            onChange={(e) => update("case_number", e.target.value)}
+            placeholder="z.B. 2026/001"
+            className={inputClass}
+          />
+        </div>
+        <div>
+          <label className="mb-1 block text-sm font-medium text-neutral-700">
+            Status
+          </label>
+          <select
+            value={form.status}
+            onChange={(e) => update("status", e.target.value)}
+            className={inputClass}
+          >
+            <option value="active">Aktiv</option>
+            <option value="pending">Anhangig</option>
+            <option value="closed">Geschlossen</option>
+          </select>
+        </div>
+      </div>
+
+      <div>
+        <label className="mb-1 block text-sm font-medium text-neutral-700">
+          Titel *
+        </label>
+        <input
+          type="text"
+          required
+          value={form.title}
+          onChange={(e) => update("title", e.target.value)}
+          placeholder="Bezeichnung der Akte"
+          className={inputClass}
+        />
+      </div>
+
+      <div className="grid grid-cols-2 gap-4">
+        <div>
+          <label className="mb-1 block text-sm font-medium text-neutral-700">
+            Verfahrensart
+          </label>
+          <select
+            value={form.case_type}
+            onChange={(e) => update("case_type", e.target.value)}
+            className={inputClass}
+          >
+            {TYPE_OPTIONS.map((o) => (
+              <option key={o.value} value={o.value}>
+                {o.label}
+              </option>
+            ))}
+          </select>
+        </div>
+        <div>
+          <label className="mb-1 block text-sm font-medium text-neutral-700">
+            Gericht
+          </label>
+          <input
+            type="text"
+            value={form.court}
+            onChange={(e) => update("court", e.target.value)}
+            placeholder="z.B. UPC Munich Central Division"
+            className={inputClass}
+          />
+        </div>
+      </div>
+
+      <div>
+        <label className="mb-1 block text-sm font-medium text-neutral-700">
+          Gerichtliches Aktenzeichen
+        </label>
+        <input
+          type="text"
+          value={form.court_ref}
+          onChange={(e) => update("court_ref", e.target.value)}
+          placeholder="z.B. UPC_CFI_123/2026"
+          className={inputClass}
+        />
+      </div>
+
+      <div className="flex justify-end pt-2">
+        <button
+          type="submit"
+          disabled={isSubmitting}
+          className="rounded-md bg-neutral-900 px-4 py-1.5 text-sm font-medium text-white hover:bg-neutral-800 disabled:opacity-50"
+        >
+          {isSubmitting ? "Speichern..." : submitLabel}
+        </button>
+      </div>
+    </form>
+  );
+}

frontend/src/components/cases/CaseTimeline.tsx

@@ -0,0 +1,60 @@
+"use client";
+
+import type { CaseEvent } from "@/lib/types";
+import { format } from "date-fns";
+import { de } from "date-fns/locale";
+
+const EVENT_ICONS: Record<string, string> = {
+  case_created: "bg-emerald-500",
+  status_changed: "bg-amber-500",
+  party_added: "bg-blue-500",
+  case_archived: "bg-neutral-400",
+  document_uploaded: "bg-violet-500",
+  deadline_created: "bg-red-500",
+};
+
+interface CaseTimelineProps {
+  events: CaseEvent[];
+}
+
+export function CaseTimeline({ events }: CaseTimelineProps) {
+  if (events.length === 0) {
+    return (
+      <p className="py-8 text-center text-sm text-neutral-400">
+        Keine Ereignisse vorhanden.
+      </p>
+    );
+  }
+
+  return (
+    <div className="relative space-y-0">
+      {events.map((event, i) => (
+        <div key={event.id} className="relative flex gap-3 pb-6">
+          {i < events.length - 1 && (
+            <div className="absolute left-[7px] top-4 h-full w-px bg-neutral-200" />
+          )}
+          <div
+            className={`mt-1 h-[15px] w-[15px] shrink-0 rounded-full border-2 border-white ${EVENT_ICONS[event.event_type ?? ""] ?? "bg-neutral-300"}`}
+          />
+          <div className="min-w-0 flex-1">
+            <p className="text-sm font-medium text-neutral-900">
+              {event.title}
+            </p>
+            {event.description && (
+              <p className="mt-0.5 text-sm text-neutral-500">
+                {event.description}
+              </p>
+            )}
+            <p className="mt-1 text-xs text-neutral-400">
+              {format(
+                new Date(event.event_date ?? event.created_at),
+                "d. MMM yyyy, HH:mm",
+                { locale: de },
+              )}
+            </p>
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}

frontend/src/components/cases/PartyList.tsx

@@ -0,0 +1,182 @@
+"use client";
+
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { useState } from "react";
+import { toast } from "sonner";
+import { api } from "@/lib/api";
+import type { Party } from "@/lib/types";
+import { Plus, Trash2, X } from "lucide-react";
+
+interface PartyListProps {
+  caseId: string;
+  parties: Party[];
+}
+
+interface PartyFormData {
+  name: string;
+  role: string;
+  representative: string;
+}
+
+const ROLE_OPTIONS = [
+  "Klager",
+  "Beklagter",
+  "Nebenintervenient",
+  "Patentinhaber",
+  "Streithelfer",
+];
+
+export function PartyList({ caseId, parties }: PartyListProps) {
+  const queryClient = useQueryClient();
+  const [showForm, setShowForm] = useState(false);
+  const [form, setForm] = useState<PartyFormData>({
+    name: "",
+    role: "",
+    representative: "",
+  });
+
+  const addMutation = useMutation({
+    mutationFn: (data: PartyFormData) =>
+      api.post<Party>(`/cases/${caseId}/parties`, {
+        name: data.name,
+        role: data.role || undefined,
+        representative: data.representative || undefined,
+      }),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["case", caseId] });
+      toast.success("Partei hinzugefugt");
+      setShowForm(false);
+      setForm({ name: "", role: "", representative: "" });
+    },
+    onError: () => toast.error("Fehler beim Hinzufugen"),
+  });
+
+  const deleteMutation = useMutation({
+    mutationFn: (partyId: string) => api.delete(`/parties/${partyId}`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["case", caseId] });
+      toast.success("Partei entfernt");
+    },
+    onError: () => toast.error("Fehler beim Entfernen"),
+  });
+
+  const inputClass =
+    "w-full rounded-md border border-neutral-200 bg-white px-3 py-1.5 text-sm outline-none focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";
+
+  return (
+    <div>
+      <div className="flex items-center justify-between">
+        <h3 className="text-sm font-medium text-neutral-700">
+          Parteien ({parties.length})
+        </h3>
+        {!showForm && (
+          <button
+            onClick={() => setShowForm(true)}
+            className="inline-flex items-center gap-1 text-sm text-neutral-500 hover:text-neutral-700"
+          >
+            <Plus className="h-3.5 w-3.5" />
+            Hinzufugen
+          </button>
+        )}
+      </div>
+
+      {parties.length === 0 && !showForm && (
+        <p className="mt-4 py-4 text-center text-sm text-neutral-400">
+          Keine Parteien vorhanden.
+        </p>
+      )}
+
+      <div className="mt-3 space-y-2">
+        {parties.map((party) => (
+          <div
+            key={party.id}
+            className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-2.5"
+          >
+            <div>
+              <p className="text-sm font-medium text-neutral-900">
+                {party.name}
+              </p>
+              <div className="mt-0.5 flex gap-3 text-xs text-neutral-500">
+                {party.role && <span>{party.role}</span>}
+                {party.representative && (
+                  <span>Vertreter: {party.representative}</span>
+                )}
+              </div>
+            </div>
+            <button
+              onClick={() => deleteMutation.mutate(party.id)}
+              className="rounded p-1 text-neutral-300 hover:bg-neutral-100 hover:text-red-500"
+              title="Partei entfernen"
+            >
+              <Trash2 className="h-3.5 w-3.5" />
+            </button>
+          </div>
+        ))}
+      </div>
+
+      {showForm && (
+        <div className="mt-3 rounded-md border border-neutral-200 bg-neutral-50 p-4">
+          <div className="flex items-center justify-between">
+            <span className="text-sm font-medium text-neutral-700">
+              Neue Partei
+            </span>
+            <button
+              onClick={() => setShowForm(false)}
+              className="text-neutral-400 hover:text-neutral-600"
+            >
+              <X className="h-4 w-4" />
+            </button>
+          </div>
+          <form
+            onSubmit={(e) => {
+              e.preventDefault();
+              addMutation.mutate(form);
+            }}
+            className="mt-3 space-y-3"
+          >
+            <input
+              type="text"
+              required
+              placeholder="Name der Partei"
+              value={form.name}
+              onChange={(e) => setForm({ ...form, name: e.target.value })}
+              className={inputClass}
+            />
+            <div className="grid grid-cols-2 gap-3">
+              <select
+                value={form.role}
+                onChange={(e) => setForm({ ...form, role: e.target.value })}
+                className={inputClass}
+              >
+                <option value="">-- Rolle --</option>
+                {ROLE_OPTIONS.map((r) => (
+                  <option key={r} value={r}>
+                    {r}
+                  </option>
+                ))}
+              </select>
+              <input
+                type="text"
+                placeholder="Vertreter / Anwalt"
+                value={form.representative}
+                onChange={(e) =>
+                  setForm({ ...form, representative: e.target.value })
+                }
+                className={inputClass}
+              />
+            </div>
+            <div className="flex justify-end">
+              <button
+                type="submit"
+                disabled={addMutation.isPending}
+                className="rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white hover:bg-neutral-800 disabled:opacity-50"
+              >
+                {addMutation.isPending ? "..." : "Hinzufugen"}
+              </button>
+            </div>
+          </form>
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/dashboard/AISummaryCard.tsx

@@ -0,0 +1,70 @@
+"use client";
+
+import { Sparkles } from "lucide-react";
+import type { DashboardData } from "@/lib/types";
+
+interface Props {
+  data: DashboardData;
+}
+
+function generateSummary(data: DashboardData): string {
+  const parts: string[] = [];
+  const { deadline_summary: ds, case_summary: cs, upcoming_deadlines: ud } = data;
+
+  // Deadline urgency
+  if (ds.overdue_count > 0) {
+    parts.push(
+      `${ds.overdue_count} Frist${ds.overdue_count > 1 ? "en" : ""} ${ds.overdue_count > 1 ? "sind" : "ist"} überfällig und ${ds.overdue_count > 1 ? "erfordern" : "erfordert"} sofortige Aufmerksamkeit.`,
+    );
+  }
+
+  if (ds.due_this_week > 0) {
+    parts.push(
+      `${ds.due_this_week} Frist${ds.due_this_week > 1 ? "en laufen" : " läuft"} diese Woche ab.`,
+    );
+  }
+
+  // Highlight most critical upcoming deadline
+  if (ud.length > 0) {
+    const next = ud[0];
+    parts.push(
+      `Die nächste Frist ist "${next.title}" in Akte ${next.case_number}.`,
+    );
+  }
+
+  // Case activity
+  if (cs.new_this_month > 0) {
+    parts.push(
+      `${cs.new_this_month} neue Akte${cs.new_this_month > 1 ? "n" : ""} diesen Monat bei ${cs.active_count} aktiven Verfahren.`,
+    );
+  } else {
+    parts.push(`${cs.active_count} aktive Verfahren.`);
+  }
+
+  // All good
+  if (ds.overdue_count === 0 && ds.due_this_week === 0) {
+    parts.unshift("Alle Fristen sind im Zeitplan.");
+  }
+
+  return parts.join(" ");
+}
+
+export function AISummaryCard({ data }: Props) {
+  const summary = generateSummary(data);
+
+  return (
+    <div className="rounded-xl border border-neutral-200 bg-white p-5">
+      <div className="flex items-center gap-2">
+        <div className="rounded-md bg-violet-50 p-1.5">
+          <Sparkles className="h-4 w-4 text-violet-500" />
+        </div>
+        <h2 className="text-sm font-semibold text-neutral-900">
+          KI-Zusammenfassung
+        </h2>
+      </div>
+      <p className="mt-3 text-sm leading-relaxed text-neutral-700">
+        {summary}
+      </p>
+    </div>
+  );
+}

frontend/src/components/dashboard/CaseOverviewGrid.tsx

@@ -0,0 +1,55 @@
+"use client";
+
+import { FolderOpen, FolderPlus, Archive } from "lucide-react";
+import type { CaseSummary } from "@/lib/types";
+
+interface Props {
+  data: CaseSummary;
+}
+
+export function CaseOverviewGrid({ data }: Props) {
+  const items = [
+    {
+      label: "Aktive Akten",
+      value: data.active_count,
+      icon: FolderOpen,
+      color: "text-blue-600",
+      bg: "bg-blue-50",
+    },
+    {
+      label: "Neu (Monat)",
+      value: data.new_this_month,
+      icon: FolderPlus,
+      color: "text-violet-600",
+      bg: "bg-violet-50",
+    },
+    {
+      label: "Abgeschlossen",
+      value: data.closed_count,
+      icon: Archive,
+      color: "text-neutral-500",
+      bg: "bg-neutral-50",
+    },
+  ];
+
+  return (
+    <div className="rounded-xl border border-neutral-200 bg-white p-5">
+      <h2 className="text-sm font-semibold text-neutral-900">Aktenübersicht</h2>
+      <div className="mt-4 space-y-3">
+        {items.map((item) => (
+          <div key={item.label} className="flex items-center justify-between">
+            <div className="flex items-center gap-2.5">
+              <div className={`rounded-md p-1.5 ${item.bg}`}>
+                <item.icon className={`h-4 w-4 ${item.color}`} />
+              </div>
+              <span className="text-sm text-neutral-600">{item.label}</span>
+            </div>
+            <span className="text-lg font-semibold tabular-nums text-neutral-900">
+              {item.value}
+            </span>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

frontend/src/components/dashboard/DeadlineTrafficLights.tsx

@@ -0,0 +1,105 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+import { AlertTriangle, Clock, CheckCircle } from "lucide-react";
+import type { DeadlineSummary } from "@/lib/types";
+
+function AnimatedCount({ value }: { value: number }) {
+  const ref = useRef<HTMLSpanElement>(null);
+  const prevValue = useRef(value);
+
+  useEffect(() => {
+    const el = ref.current;
+    if (!el || prevValue.current === value) return;
+
+    el.classList.remove("animate-count-up");
+    void el.offsetWidth;
+    el.classList.add("animate-count-up");
+    prevValue.current = value;
+  }, [value]);
+
+  return (
+    <span ref={ref} className="inline-block tabular-nums">
+      {value}
+    </span>
+  );
+}
+
+interface Props {
+  data: DeadlineSummary;
+  onFilter?: (filter: "overdue" | "this_week" | "ok") => void;
+}
+
+export function DeadlineTrafficLights({ data, onFilter }: Props) {
+  const cards = [
+    {
+      key: "overdue" as const,
+      label: "Überfällig",
+      count: data.overdue_count,
+      icon: AlertTriangle,
+      bg: "bg-red-50",
+      border: "border-red-200",
+      iconColor: "text-red-500",
+      countColor: "text-red-700",
+      labelColor: "text-red-600",
+      ring: data.overdue_count > 0 ? "ring-2 ring-red-300 ring-offset-1" : "",
+      pulse: data.overdue_count > 0,
+    },
+    {
+      key: "this_week" as const,
+      label: "Diese Woche",
+      count: data.due_this_week,
+      icon: Clock,
+      bg: "bg-amber-50",
+      border: "border-amber-200",
+      iconColor: "text-amber-500",
+      countColor: "text-amber-700",
+      labelColor: "text-amber-600",
+      ring: "",
+      pulse: false,
+    },
+    {
+      key: "ok" as const,
+      label: "Im Zeitplan",
+      count: data.ok_count + data.due_next_week,
+      icon: CheckCircle,
+      bg: "bg-emerald-50",
+      border: "border-emerald-200",
+      iconColor: "text-emerald-500",
+      countColor: "text-emerald-700",
+      labelColor: "text-emerald-600",
+      ring: "",
+      pulse: false,
+    },
+  ];
+
+  return (
+    <div className="grid grid-cols-1 gap-4 sm:grid-cols-3">
+      {cards.map((card) => (
+        <button
+          key={card.key}
+          onClick={() => onFilter?.(card.key)}
+          className={`group relative overflow-hidden rounded-xl border ${card.border} ${card.bg} ${card.ring} p-6 text-left transition-all hover:shadow-md active:scale-[0.98]`}
+        >
+          {card.pulse && (
+            <span className="absolute right-4 top-4 flex h-3 w-3">
+              <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-red-400 opacity-75" />
+              <span className="relative inline-flex h-3 w-3 rounded-full bg-red-500" />
+            </span>
+          )}
+          <div className="flex items-center gap-3">
+            <div className={`rounded-lg p-2 ${card.bg}`}>
+              <card.icon className={`h-5 w-5 ${card.iconColor}`} />
+            </div>
+            <span className={`text-sm font-medium ${card.labelColor}`}>
+              {card.label}
+            </span>
+          </div>
+          <div className={`mt-4 text-4xl font-bold tracking-tight ${card.countColor}`}>
+            <AnimatedCount value={card.count} />
+          </div>
+        </button>
+      ))}
+    </div>
+  );
+}

frontend/src/components/dashboard/QuickActions.tsx

@@ -0,0 +1,53 @@
+"use client";
+
+import Link from "next/link";
+import { FolderPlus, Clock, Sparkles, CalendarSync } from "lucide-react";
+
+const actions = [
+  {
+    label: "Neue Akte",
+    href: "/akten?new=1",
+    icon: FolderPlus,
+    color: "text-blue-600 bg-blue-50 hover:bg-blue-100",
+  },
+  {
+    label: "Frist eintragen",
+    href: "/fristen?new=1",
+    icon: Clock,
+    color: "text-amber-600 bg-amber-50 hover:bg-amber-100",
+  },
+  {
+    label: "AI Analyse",
+    href: "/ai",
+    icon: Sparkles,
+    color: "text-violet-600 bg-violet-50 hover:bg-violet-100",
+  },
+  {
+    label: "CalDAV Sync",
+    href: "/einstellungen",
+    icon: CalendarSync,
+    color: "text-emerald-600 bg-emerald-50 hover:bg-emerald-100",
+  },
+];
+
+export function QuickActions() {
+  return (
+    <div className="rounded-xl border border-neutral-200 bg-white p-5">
+      <h2 className="text-sm font-semibold text-neutral-900">
+        Schnellzugriff
+      </h2>
+      <div className="mt-3 grid grid-cols-2 gap-2">
+        {actions.map((action) => (
+          <Link
+            key={action.label}
+            href={action.href}
+            className={`flex items-center gap-2 rounded-lg px-3 py-2.5 text-sm font-medium transition-colors ${action.color}`}
+          >
+            <action.icon className="h-4 w-4" />
+            {action.label}
+          </Link>
+        ))}
+      </div>
+    </div>
+  );
+}

frontend/src/components/dashboard/UpcomingTimeline.tsx

@@ -0,0 +1,134 @@
+"use client";
+
+import { format, parseISO, isToday, isTomorrow } from "date-fns";
+import { de } from "date-fns/locale";
+import { Clock, Calendar, MapPin } from "lucide-react";
+import type { UpcomingDeadline, UpcomingAppointment } from "@/lib/types";
+
+interface Props {
+  deadlines: UpcomingDeadline[];
+  appointments: UpcomingAppointment[];
+}
+
+type TimelineItem =
+  | { type: "deadline"; date: Date; data: UpcomingDeadline }
+  | { type: "appointment"; date: Date; data: UpcomingAppointment };
+
+function formatDayLabel(date: Date): string {
+  if (isToday(date)) return "Heute";
+  if (isTomorrow(date)) return "Morgen";
+  return format(date, "EEEE, d. MMM", { locale: de });
+}
+
+export function UpcomingTimeline({ deadlines, appointments }: Props) {
+  const items: TimelineItem[] = [
+    ...deadlines.map((d) => ({
+      type: "deadline" as const,
+      date: parseISO(d.due_date),
+      data: d,
+    })),
+    ...appointments.map((a) => ({
+      type: "appointment" as const,
+      date: parseISO(a.start_at),
+      data: a,
+    })),
+  ].sort((a, b) => a.date.getTime() - b.date.getTime());
+
+  // Group by day
+  const grouped = new Map<string, TimelineItem[]>();
+  for (const item of items) {
+    const key = format(item.date, "yyyy-MM-dd");
+    const group = grouped.get(key) ?? [];
+    group.push(item);
+    grouped.set(key, group);
+  }
+
+  const empty = items.length === 0;
+
+  return (
+    <div className="rounded-xl border border-neutral-200 bg-white p-5">
+      <h2 className="text-sm font-semibold text-neutral-900">
+        Nächste 7 Tage
+      </h2>
+      {empty ? (
+        <p className="mt-6 text-center text-sm text-neutral-400">
+          Keine anstehenden Termine oder Fristen
+        </p>
+      ) : (
+        <div className="mt-4 space-y-5">
+          {Array.from(grouped.entries()).map(([dateKey, dayItems]) => (
+            <div key={dateKey}>
+              <p className="text-xs font-medium uppercase tracking-wider text-neutral-400">
+                {formatDayLabel(dayItems[0].date)}
+              </p>
+              <div className="mt-2 space-y-2">
+                {dayItems.map((item, i) => (
+                  <TimelineEntry key={`${item.type}-${i}`} item={item} />
+                ))}
+              </div>
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}
+
+function TimelineEntry({ item }: { item: TimelineItem }) {
+  if (item.type === "deadline") {
+    const d = item.data;
+    return (
+      <div className="flex items-start gap-3 rounded-lg border border-neutral-100 bg-neutral-50/50 px-3 py-2.5">
+        <div className="mt-0.5 rounded-md bg-amber-50 p-1">
+          <Clock className="h-3.5 w-3.5 text-amber-500" />
+        </div>
+        <div className="min-w-0 flex-1">
+          <p className="truncate text-sm font-medium text-neutral-900">
+            {d.title}
+          </p>
+          <p className="mt-0.5 truncate text-xs text-neutral-500">
+            {d.case_number} · {d.case_title}
+          </p>
+        </div>
+        <span className="shrink-0 text-xs font-medium text-amber-600">
+          Frist
+        </span>
+      </div>
+    );
+  }
+
+  const a = item.data;
+  return (
+    <div className="flex items-start gap-3 rounded-lg border border-neutral-100 bg-neutral-50/50 px-3 py-2.5">
+      <div className="mt-0.5 rounded-md bg-blue-50 p-1">
+        <Calendar className="h-3.5 w-3.5 text-blue-500" />
+      </div>
+      <div className="min-w-0 flex-1">
+        <p className="truncate text-sm font-medium text-neutral-900">
+          {a.title}
+        </p>
+        <div className="mt-0.5 flex items-center gap-2 text-xs text-neutral-500">
+          <span>{format(item.date, "HH:mm")} Uhr</span>
+          {a.location && (
+            <>
+              <span className="text-neutral-300">·</span>
+              <span className="flex items-center gap-0.5 truncate">
+                <MapPin className="h-3 w-3" />
+                {a.location}
+              </span>
+            </>
+          )}
+          {a.case_number && (
+            <>
+              <span className="text-neutral-300">·</span>
+              <span>{a.case_number}</span>
+            </>
+          )}
+        </div>
+      </div>
+      <span className="shrink-0 text-xs font-medium text-blue-600">
+        Termin
+      </span>
+    </div>
+  );
+}

frontend/src/components/deadlines/DeadlineCalculator.tsx

@@ -0,0 +1,178 @@
+"use client";
+
+import { useQuery, useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { ProceedingType, CalculateResponse, CalculatedDeadline } from "@/lib/types";
+import { format, parseISO, isPast, isThisWeek } from "date-fns";
+import { de } from "date-fns/locale";
+import { Calculator, Calendar, ArrowRight, AlertTriangle } from "lucide-react";
+import { useState } from "react";
+
+function getTimelineUrgency(dueDate: string): "red" | "amber" | "green" {
+  const due = parseISO(dueDate);
+  if (isPast(due)) return "red";
+  if (isThisWeek(due, { weekStartsOn: 1 })) return "amber";
+  return "green";
+}
+
+const dotColors = {
+  red: "bg-red-500",
+  amber: "bg-amber-500",
+  green: "bg-green-500",
+};
+
+export function DeadlineCalculator() {
+  const [proceedingType, setProceedingType] = useState("");
+  const [triggerDate, setTriggerDate] = useState("");
+
+  const { data: proceedingTypes, isLoading: typesLoading } = useQuery({
+    queryKey: ["proceeding-types"],
+    queryFn: () => api.get<ProceedingType[]>("/api/proceeding-types"),
+  });
+
+  const calculateMutation = useMutation({
+    mutationFn: (params: { proceeding_type: string; trigger_event_date: string }) =>
+      api.post<CalculateResponse>("/api/deadlines/calculate", params),
+  });
+
+  function handleCalculate(e: React.FormEvent) {
+    e.preventDefault();
+    if (!proceedingType || !triggerDate) return;
+    calculateMutation.mutate({
+      proceeding_type: proceedingType,
+      trigger_event_date: triggerDate,
+    });
+  }
+
+  const results = calculateMutation.data;
+
+  return (
+    <div className="space-y-6">
+      {/* Input form */}
+      <form onSubmit={handleCalculate} className="rounded-lg border border-neutral-200 bg-white p-5">
+        <div className="flex items-center gap-2 text-sm font-medium text-neutral-900">
+          <Calculator className="h-4 w-4" />
+          Fristenberechnung
+        </div>
+        <div className="mt-4 grid gap-4 sm:grid-cols-3">
+          <div>
+            <label className="mb-1 block text-xs font-medium text-neutral-500">
+              Verfahrensart
+            </label>
+            <select
+              value={proceedingType}
+              onChange={(e) => setProceedingType(e.target.value)}
+              disabled={typesLoading}
+              className="w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900"
+            >
+              <option value="">Bitte wahlen...</option>
+              {proceedingTypes?.map((pt) => (
+                <option key={pt.id} value={pt.code}>
+                  {pt.name} ({pt.code})
+                </option>
+              ))}
+            </select>
+          </div>
+          <div>
+            <label className="mb-1 block text-xs font-medium text-neutral-500">
+              Auslosedatum
+            </label>
+            <input
+              type="date"
+              value={triggerDate}
+              onChange={(e) => setTriggerDate(e.target.value)}
+              className="w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900"
+            />
+          </div>
+          <div className="flex items-end">
+            <button
+              type="submit"
+              disabled={!proceedingType || !triggerDate || calculateMutation.isPending}
+              className="flex w-full items-center justify-center gap-2 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"
+            >
+              {calculateMutation.isPending ? "Berechne..." : "Berechnen"}
+              <ArrowRight className="h-3.5 w-3.5" />
+            </button>
+          </div>
+        </div>
+      </form>
+
+      {/* Error */}
+      {calculateMutation.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 prufen.
+        </div>
+      )}
+
+      {/* Results */}
+      {results && results.deadlines && (
+        <div className="space-y-3">
+          <div className="flex items-center justify-between">
+            <h3 className="text-sm font-medium text-neutral-900">
+              Berechnete Fristen
+            </h3>
+            <span className="text-xs text-neutral-500">
+              {results.deadlines.length} Fristen ab{" "}
+              {format(parseISO(results.trigger_event_date), "dd. MMM yyyy", { locale: de })}
+            </span>
+          </div>
+
+          {/* Timeline */}
+          <div className="relative rounded-lg border border-neutral-200 bg-white">
+            {results.deadlines.map((d: CalculatedDeadline, i: number) => {
+              const urgency = getTimelineUrgency(d.due_date);
+              const isLast = i === results.deadlines.length - 1;
+
+              return (
+                <div
+                  key={d.rule_id}
+                  className={`flex gap-3 px-4 py-3 ${!isLast ? "border-b border-neutral-100" : ""}`}
+                >
+                  {/* Timeline dot + line */}
+                  <div className="flex flex-col items-center pt-1">
+                    <div className={`h-2.5 w-2.5 shrink-0 rounded-full ${dotColors[urgency]}`} />
+                    {!isLast && <div className="mt-1 w-px flex-1 bg-neutral-200" />}
+                  </div>
+
+                  {/* Content */}
+                  <div className="min-w-0 flex-1">
+                    <div className="flex items-start justify-between gap-2">
+                      <span className="text-sm font-medium text-neutral-900">
+                        {d.title}
+                      </span>
+                      <span className="shrink-0 text-sm font-medium tabular-nums text-neutral-700">
+                        {format(parseISO(d.due_date), "dd.MM.yyyy")}
+                      </span>
+                    </div>
+                    <div className="mt-0.5 flex items-center gap-2 text-xs text-neutral-500">
+                      {d.rule_code && <span>{d.rule_code}</span>}
+                      {d.was_adjusted && (
+                        <>
+                          {d.rule_code && <span>·</span>}
+                          <span className="text-amber-600">
+                            Angepasst (Original: {format(parseISO(d.original_due_date), "dd.MM.yyyy")})
+                          </span>
+                        </>
+                      )}
+                    </div>
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        </div>
+      )}
+
+      {/* Empty state */}
+      {!results && !calculateMutation.isPending && (
+        <div className="rounded-lg border border-neutral-200 bg-white p-8 text-center">
+          <Calendar className="mx-auto h-8 w-8 text-neutral-300" />
+          <p className="mt-2 text-sm text-neutral-500">
+            Verfahrensart und Auslosedatum wahlen, um Fristen zu berechnen
+          </p>
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/deadlines/DeadlineCalendarView.tsx

@@ -0,0 +1,154 @@
+"use client";
+
+import type { Deadline } from "@/lib/types";
+import {
+  format,
+  startOfMonth,
+  endOfMonth,
+  startOfWeek,
+  endOfWeek,
+  eachDayOfInterval,
+  isSameMonth,
+  isToday,
+  parseISO,
+  isPast,
+  isThisWeek,
+  addMonths,
+  subMonths,
+} from "date-fns";
+import { de } from "date-fns/locale";
+import { ChevronLeft, ChevronRight } from "lucide-react";
+import { useState, useMemo } from "react";
+
+interface DeadlineCalendarViewProps {
+  deadlines: Deadline[];
+}
+
+function getUrgency(deadline: Deadline): "red" | "amber" | "green" {
+  if (deadline.status === "completed") return "green";
+  const due = parseISO(deadline.due_date);
+  if (isPast(due)) return "red";
+  if (isThisWeek(due, { weekStartsOn: 1 })) return "amber";
+  return "green";
+}
+
+const dotColors = {
+  red: "bg-red-500",
+  amber: "bg-amber-500",
+  green: "bg-green-500",
+};
+
+export function DeadlineCalendarView({ deadlines }: DeadlineCalendarViewProps) {
+  const [currentMonth, setCurrentMonth] = useState(new Date());
+
+  const monthStart = startOfMonth(currentMonth);
+  const monthEnd = endOfMonth(currentMonth);
+  const calStart = startOfWeek(monthStart, { weekStartsOn: 1 });
+  const calEnd = endOfWeek(monthEnd, { weekStartsOn: 1 });
+  const days = eachDayOfInterval({ start: calStart, end: calEnd });
+
+  const deadlinesByDay = useMemo(() => {
+    const map = new Map<string, Deadline[]>();
+    for (const d of deadlines) {
+      if (d.status === "completed") continue;
+      const key = d.due_date.slice(0, 10);
+      const existing = map.get(key) || [];
+      existing.push(d);
+      map.set(key, existing);
+    }
+    return map;
+  }, [deadlines]);
+
+  const weekDays = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"];
+
+  return (
+    <div className="rounded-lg border border-neutral-200 bg-white">
+      {/* Header */}
+      <div className="flex items-center justify-between border-b border-neutral-200 px-4 py-3">
+        <button
+          onClick={() => setCurrentMonth(subMonths(currentMonth, 1))}
+          className="rounded-md p-1 text-neutral-400 hover:bg-neutral-100 hover:text-neutral-600"
+        >
+          <ChevronLeft className="h-4 w-4" />
+        </button>
+        <span className="text-sm font-medium text-neutral-900">
+          {format(currentMonth, "MMMM yyyy", { locale: de })}
+        </span>
+        <button
+          onClick={() => setCurrentMonth(addMonths(currentMonth, 1))}
+          className="rounded-md p-1 text-neutral-400 hover:bg-neutral-100 hover:text-neutral-600"
+        >
+          <ChevronRight className="h-4 w-4" />
+        </button>
+      </div>
+
+      {/* Weekday labels */}
+      <div className="grid grid-cols-7 border-b border-neutral-100">
+        {weekDays.map((d) => (
+          <div key={d} className="px-2 py-2 text-center text-xs font-medium text-neutral-400">
+            {d}
+          </div>
+        ))}
+      </div>
+
+      {/* Days grid */}
+      <div className="grid grid-cols-7">
+        {days.map((day, i) => {
+          const key = format(day, "yyyy-MM-dd");
+          const dayDeadlines = deadlinesByDay.get(key) || [];
+          const inMonth = isSameMonth(day, currentMonth);
+          const today = isToday(day);
+
+          return (
+            <div
+              key={i}
+              className={`min-h-[4.5rem] border-b border-r border-neutral-100 p-1.5 ${
+                !inMonth ? "bg-neutral-50" : ""
+              }`}
+            >
+              <div
+                className={`mb-1 text-right text-xs ${
+                  today
+                    ? "font-bold text-neutral-900"
+                    : inMonth
+                      ? "text-neutral-600"
+                      : "text-neutral-300"
+                }`}
+              >
+                {today ? (
+                  <span className="inline-flex h-5 w-5 items-center justify-center rounded-full bg-neutral-900 text-white">
+                    {format(day, "d")}
+                  </span>
+                ) : (
+                  format(day, "d")
+                )}
+              </div>
+              <div className="space-y-0.5">
+                {dayDeadlines.slice(0, 3).map((dl) => {
+                  const urgency = getUrgency(dl);
+                  return (
+                    <div
+                      key={dl.id}
+                      className="flex items-center gap-1 truncate"
+                      title={dl.title}
+                    >
+                      <div className={`h-1.5 w-1.5 shrink-0 rounded-full ${dotColors[urgency]}`} />
+                      <span className="truncate text-[10px] text-neutral-700">
+                        {dl.title}
+                      </span>
+                    </div>
+                  );
+                })}
+                {dayDeadlines.length > 3 && (
+                  <div className="text-[10px] text-neutral-400">
+                    +{dayDeadlines.length - 3} mehr
+                  </div>
+                )}
+              </div>
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+}

frontend/src/components/deadlines/DeadlineList.tsx

@@ -0,0 +1,257 @@
+"use client";
+
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { Deadline, Case } from "@/lib/types";
+import { format, isPast, isThisWeek, parseISO } from "date-fns";
+import { de } from "date-fns/locale";
+import { Check, Clock, Filter } from "lucide-react";
+import { toast } from "sonner";
+import { useState, useMemo } from "react";
+
+type StatusFilter = "all" | "pending" | "completed" | "overdue";
+
+function getUrgency(deadline: Deadline): "red" | "amber" | "green" {
+  if (deadline.status === "completed") return "green";
+  const due = parseISO(deadline.due_date);
+  if (isPast(due)) return "red";
+  if (isThisWeek(due, { weekStartsOn: 1 })) return "amber";
+  return "green";
+}
+
+const urgencyConfig = {
+  red: {
+    bg: "bg-red-50",
+    border: "border-red-200",
+    badge: "bg-red-100 text-red-700",
+    dot: "bg-red-500",
+    label: "Uberschritten",
+  },
+  amber: {
+    bg: "bg-amber-50",
+    border: "border-amber-200",
+    badge: "bg-amber-100 text-amber-700",
+    dot: "bg-amber-500",
+    label: "Diese Woche",
+  },
+  green: {
+    bg: "bg-white",
+    border: "border-neutral-200",
+    badge: "bg-green-100 text-green-700",
+    dot: "bg-green-500",
+    label: "OK",
+  },
+};
+
+export function DeadlineList() {
+  const queryClient = useQueryClient();
+  const [statusFilter, setStatusFilter] = useState<StatusFilter>("all");
+  const [caseFilter, setCaseFilter] = useState<string>("all");
+
+  const { data: deadlines, isLoading } = useQuery({
+    queryKey: ["deadlines"],
+    queryFn: () => api.get<Deadline[]>("/api/deadlines"),
+  });
+
+  const { data: cases } = useQuery({
+    queryKey: ["cases"],
+    queryFn: () => api.get<Case[]>("/api/cases"),
+  });
+
+  const completeMutation = useMutation({
+    mutationFn: (id: string) =>
+      api.patch<Deadline>(`/api/deadlines/${id}/complete`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["deadlines"] });
+      toast.success("Frist als erledigt markiert");
+    },
+    onError: () => {
+      toast.error("Fehler beim Abschliessen der Frist");
+    },
+  });
+
+  const caseMap = useMemo(() => {
+    const map = new Map<string, Case>();
+    cases?.forEach((c) => map.set(c.id, c));
+    return map;
+  }, [cases]);
+
+  const filtered = useMemo(() => {
+    if (!deadlines) return [];
+    return deadlines.filter((d) => {
+      if (statusFilter === "pending" && d.status !== "pending") return false;
+      if (statusFilter === "completed" && d.status !== "completed") return false;
+      if (statusFilter === "overdue") {
+        if (d.status === "completed") return false;
+        if (!isPast(parseISO(d.due_date))) return false;
+      }
+      if (caseFilter !== "all" && d.case_id !== caseFilter) return false;
+      return true;
+    });
+  }, [deadlines, statusFilter, caseFilter]);
+
+  const counts = useMemo(() => {
+    if (!deadlines) return { overdue: 0, thisWeek: 0, ok: 0 };
+    let overdue = 0, thisWeek = 0, ok = 0;
+    for (const d of deadlines) {
+      if (d.status === "completed") continue;
+      const urgency = getUrgency(d);
+      if (urgency === "red") overdue++;
+      else if (urgency === "amber") thisWeek++;
+      else ok++;
+    }
+    return { overdue, thisWeek, ok };
+  }, [deadlines]);
+
+  if (isLoading) {
+    return (
+      <div className="space-y-3">
+        {[1, 2, 3, 4, 5].map((i) => (
+          <div key={i} className="h-16 animate-pulse rounded-lg bg-neutral-100" />
+        ))}
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      {/* Summary cards */}
+      <div className="grid grid-cols-3 gap-3">
+        <button
+          onClick={() => setStatusFilter(statusFilter === "overdue" ? "all" : "overdue")}
+          className={`rounded-lg border p-3 text-left transition-colors ${
+            statusFilter === "overdue"
+              ? "border-red-300 bg-red-50"
+              : "border-neutral-200 bg-white hover:bg-neutral-50"
+          }`}
+        >
+          <div className="text-2xl font-semibold text-red-600">{counts.overdue}</div>
+          <div className="text-xs text-neutral-500">Uberschritten</div>
+        </button>
+        <button
+          onClick={() => setStatusFilter(statusFilter === "pending" ? "all" : "pending")}
+          className={`rounded-lg border p-3 text-left transition-colors ${
+            statusFilter === "pending"
+              ? "border-amber-300 bg-amber-50"
+              : "border-neutral-200 bg-white hover:bg-neutral-50"
+          }`}
+        >
+          <div className="text-2xl font-semibold text-amber-600">{counts.thisWeek}</div>
+          <div className="text-xs text-neutral-500">Diese Woche</div>
+        </button>
+        <button
+          onClick={() => setStatusFilter("all")}
+          className={`rounded-lg border p-3 text-left transition-colors ${
+            statusFilter === "all"
+              ? "border-green-300 bg-green-50"
+              : "border-neutral-200 bg-white hover:bg-neutral-50"
+          }`}
+        >
+          <div className="text-2xl font-semibold text-green-600">{counts.ok}</div>
+          <div className="text-xs text-neutral-500">OK</div>
+        </button>
+      </div>
+
+      {/* Filters */}
+      <div className="flex items-center gap-3">
+        <div className="flex items-center gap-1.5 text-sm text-neutral-500">
+          <Filter className="h-3.5 w-3.5" />
+          <span>Filter:</span>
+        </div>
+        <select
+          value={statusFilter}
+          onChange={(e) => setStatusFilter(e.target.value as StatusFilter)}
+          className="rounded-md border border-neutral-200 bg-white px-2.5 py-1 text-sm text-neutral-700"
+        >
+          <option value="all">Alle Status</option>
+          <option value="pending">Offen</option>
+          <option value="completed">Erledigt</option>
+          <option value="overdue">Uberschritten</option>
+        </select>
+        {cases && cases.length > 0 && (
+          <select
+            value={caseFilter}
+            onChange={(e) => setCaseFilter(e.target.value)}
+            className="rounded-md border border-neutral-200 bg-white px-2.5 py-1 text-sm text-neutral-700"
+          >
+            <option value="all">Alle Akten</option>
+            {cases.map((c) => (
+              <option key={c.id} value={c.id}>
+                {c.case_number} — {c.title}
+              </option>
+            ))}
+          </select>
+        )}
+      </div>
+
+      {/* Deadline list */}
+      {filtered.length === 0 ? (
+        <div className="rounded-lg border border-neutral-200 bg-white p-8 text-center">
+          <Clock className="mx-auto h-8 w-8 text-neutral-300" />
+          <p className="mt-2 text-sm text-neutral-500">Keine Fristen gefunden</p>
+        </div>
+      ) : (
+        <div className="space-y-2">
+          {filtered.map((deadline) => {
+            const urgency = getUrgency(deadline);
+            const config = urgencyConfig[urgency];
+            const caseInfo = caseMap.get(deadline.case_id);
+
+            return (
+              <div
+                key={deadline.id}
+                className={`flex items-center gap-3 rounded-lg border px-4 py-3 ${config.bg} ${config.border}`}
+              >
+                <div className={`h-2.5 w-2.5 shrink-0 rounded-full ${config.dot}`} />
+                <div className="min-w-0 flex-1">
+                  <div className="flex items-center gap-2">
+                    <span className="truncate text-sm font-medium text-neutral-900">
+                      {deadline.title}
+                    </span>
+                    <span className={`shrink-0 rounded px-1.5 py-0.5 text-xs font-medium ${config.badge}`}>
+                      {config.label}
+                    </span>
+                    {deadline.status === "completed" && (
+                      <span className="shrink-0 rounded bg-neutral-100 px-1.5 py-0.5 text-xs font-medium text-neutral-500">
+                        Erledigt
+                      </span>
+                    )}
+                  </div>
+                  <div className="mt-0.5 flex items-center gap-2 text-xs text-neutral-500">
+                    <span>
+                      {format(parseISO(deadline.due_date), "dd. MMM yyyy", { locale: de })}
+                    </span>
+                    {caseInfo && (
+                      <>
+                        <span>·</span>
+                        <span className="truncate">
+                          {caseInfo.case_number} — {caseInfo.title}
+                        </span>
+                      </>
+                    )}
+                    {deadline.source !== "manual" && (
+                      <>
+                        <span>·</span>
+                        <span>{deadline.source}</span>
+                      </>
+                    )}
+                  </div>
+                </div>
+                {deadline.status !== "completed" && (
+                  <button
+                    onClick={() => completeMutation.mutate(deadline.id)}
+                    disabled={completeMutation.isPending}
+                    title="Als erledigt markieren"
+                    className="shrink-0 rounded-md p-1.5 text-neutral-400 hover:bg-white hover:text-green-600"
+                  >
+                    <Check className="h-4 w-4" />
+                  </button>
+                )}
+              </div>
+            );
+          })}
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/layout/Sidebar.tsx

@@ -12,7 +12,7 @@ import {
 } from "lucide-react";
 
 const navigation = [
-  { name: "Dashboard", href: "/", icon: LayoutDashboard },
+  { name: "Dashboard", href: "/dashboard", icon: LayoutDashboard },
   { name: "Akten", href: "/akten", icon: FolderOpen },
   { name: "Fristen", href: "/fristen", icon: Clock },
   { name: "Termine", href: "/termine", icon: Calendar },
@@ -30,10 +30,7 @@ export function Sidebar() {
       </div>
       <nav className="flex-1 space-y-0.5 p-2">
         {navigation.map((item) => {
-          const isActive =
-            item.href === "/"
-              ? pathname === "/"
-              : pathname.startsWith(item.href);
+          const isActive = pathname.startsWith(item.href);
           return (
             <Link
               key={item.href}

frontend/src/lib/api.ts

@@ -69,6 +69,13 @@ class ApiClient {
     });
   }
 
+  patch<T>(path: string, body?: unknown) {
+    return this.request<T>(path, {
+      method: "PATCH",
+      body: body ? JSON.stringify(body) : undefined,
+    });
+  }
+
   delete<T>(path: string) {
     return this.request<T>(path, { method: "DELETE" });
   }

frontend/src/lib/types.ts

@@ -104,21 +104,52 @@ export interface Document {
   updated_at: string;
 }
 
-export interface ExtractedDeadline {
-  title: string;
-  due_date: string | null;
+export interface DeadlineRule {
+  id: string;
+  proceeding_type_id?: number;
+  parent_id?: string;
+  code?: string;
+  name: string;
+  description?: string;
+  primary_party?: string;
+  event_type?: string;
+  is_mandatory: boolean;
   duration_value: number;
   duration_unit: string;
-  timing: string;
-  trigger_event: string;
-  rule_reference: string;
-  confidence: number;
-  source_quote: string;
+  timing?: string;
+  rule_code?: string;
+  deadline_notes?: string;
+  sequence_order: number;
 }
 
-export interface ExtractionResponse {
-  deadlines: ExtractedDeadline[];
-  count: number;
+export interface RuleTreeNode extends DeadlineRule {
+  children?: RuleTreeNode[];
+}
+
+export interface ProceedingType {
+  id: number;
+  code: string;
+  name: string;
+  description?: string;
+  jurisdiction?: string;
+  default_color: string;
+  sort_order: number;
+  is_active: boolean;
+}
+
+export interface CalculatedDeadline {
+  rule_code: string;
+  rule_id: string;
+  title: string;
+  due_date: string;
+  original_due_date: string;
+  was_adjusted: boolean;
+}
+
+export interface CalculateResponse {
+  proceeding_type: string;
+  trigger_event_date: string;
+  deadlines: CalculatedDeadline[];
 }
 
 export interface ApiError {