feat: frontend AI tab — KI-Strategie, KI-Entwurf, Aehnliche Faelle

New "KI" tab on case detail page with three sub-panels: - KI-Strategie: one-click strategic analysis with next steps, risks, timeline - KI-Entwurf: document drafting with template selection, language, instructions - Aehnliche Faelle: UPC similar case search with relevance scores Components: CaseStrategy, DocumentDrafter, SimilarCaseFinder Types: StrategyRecommendation, DocumentDraft, SimilarCase, etc.
feat: AI-powered features — document drafting, case strategy, similar case finder (P2)
2026-03-30 11:26:01 +02:00 · 2026-03-30 11:25:52 +02:00 · 2026-03-30 11:25:41 +02:00
30 changed files with 1649 additions and 2339 deletions
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@@ -5,6 +5,9 @@ import (
 	"net/http"
 	"os"

+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/config"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/db"
@@ -31,6 +34,21 @@ func main() {

 	authMW := auth.NewMiddleware(cfg.SupabaseJWTSecret, database)

+	// Optional: connect to youpc.org database for similar case finder
+	var youpcDB *sqlx.DB
+	if cfg.YouPCDatabaseURL != "" {
+		youpcDB, err = sqlx.Connect("postgres", cfg.YouPCDatabaseURL)
+		if err != nil {
+			slog.Warn("failed to connect to youpc.org database — similar case finder disabled", "error", err)
+			youpcDB = nil
+		} else {
+			youpcDB.SetMaxOpenConns(5)
+			youpcDB.SetMaxIdleConns(2)
+			defer youpcDB.Close()
+			slog.Info("connected to youpc.org database for similar case finder")
+		}
+	}
+
 	// Start CalDAV sync service
 	calDAVSvc := services.NewCalDAVService(database)
 	calDAVSvc.Start()
@@ -41,7 +59,7 @@ func main() {
 	notifSvc.Start()
 	defer notifSvc.Stop()

-	handler := router.New(database, authMW, cfg, calDAVSvc, notifSvc)
+	handler := router.New(database, authMW, cfg, calDAVSvc, notifSvc, youpcDB)

 	slog.Info("starting KanzlAI API server", "port", cfg.Port)
 	if err := http.ListenAndServe(":"+cfg.Port, handler); err != nil {
--- a/backend/internal/auth/middleware.go
+++ b/backend/internal/auth/middleware.go
@@ -45,7 +45,6 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {

 		// Tenant resolution is handled by TenantResolver middleware for scoped routes.
 		// Tenant management routes handle their own access control.
-
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
--- a/backend/internal/auth/tenant_resolver.go
+++ b/backend/internal/auth/tenant_resolver.go
@@ -58,7 +58,7 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 			tenantID = parsed
 			r = r.WithContext(ContextWithUserRole(r.Context(), role))
 		} else {
-			// Default to user's first tenant
+			// Default to user's first tenant (role already set by middleware)
 			first, err := tr.lookup.FirstTenantForUser(r.Context(), userID)
 			if err != nil {
 				slog.Error("failed to resolve default tenant", "error", err, "user_id", userID)
@@ -70,15 +70,6 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 				return
 			}
 			tenantID = *first
-
-			// Also resolve role for default tenant
-			role, err := tr.lookup.GetUserRole(r.Context(), userID, tenantID)
-			if err != nil {
-				slog.Error("failed to get role for default tenant", "error", err, "user_id", userID, "tenant_id", tenantID)
-				http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
-				return
-			}
-			r = r.WithContext(ContextWithUserRole(r.Context(), role))
 		}

 		ctx := ContextWithTenantID(r.Context(), tenantID)
--- a/backend/internal/auth/tenant_resolver_test.go
+++ b/backend/internal/auth/tenant_resolver_test.go
@@ -15,6 +15,7 @@ type mockTenantLookup struct {
 	hasAccess bool
 	accessErr error
 	role      string
+	noAccess  bool // when true, GetUserRole returns ""
 }

 func (m *mockTenantLookup) FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error) {
@@ -26,18 +27,18 @@ func (m *mockTenantLookup) VerifyAccess(ctx context.Context, userID, tenantID uu
 }

 func (m *mockTenantLookup) GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error) {
+	if m.noAccess {
+		return "", m.err
+	}
 	if m.role != "" {
 		return m.role, m.err
 	}
-	if m.hasAccess {
-		return "associate", m.err
-	}
-	return "", m.err
+	return "associate", m.err
 }

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

 	var gotTenantID uuid.UUID
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -66,7 +67,7 @@ func TestTenantResolver_FromHeader(t *testing.T) {

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

 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		t.Fatal("next should not be called")
@@ -86,7 +87,7 @@ func TestTenantResolver_FromHeader_NoAccess(t *testing.T) {

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

 	var gotTenantID uuid.UUID
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@@ -14,6 +14,7 @@ type Config struct {
 	SupabaseJWTSecret string
 	AnthropicAPIKey   string
 	FrontendOrigin    string
+	YouPCDatabaseURL  string // read-only connection to youpc.org Supabase for similar case finder
 }

 func Load() (*Config, error) {
@@ -26,6 +27,7 @@ func Load() (*Config, error) {
 		SupabaseJWTSecret: os.Getenv("SUPABASE_JWT_SECRET"),
 		AnthropicAPIKey:  os.Getenv("ANTHROPIC_API_KEY"),
 		FrontendOrigin:   getEnv("FRONTEND_ORIGIN", "https://kanzlai.msbls.de"),
+		YouPCDatabaseURL: os.Getenv("YOUPC_DATABASE_URL"),
 	}

 	if cfg.DatabaseURL == "" {
--- a/backend/internal/handlers/ai.go
+++ b/backend/internal/handlers/ai.go
@@ -5,6 +5,8 @@ import (
 	"io"
 	"net/http"

+	"github.com/google/uuid"
+
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )
@@ -115,3 +117,139 @@ func (h *AIHandler) SummarizeCase(w http.ResponseWriter, r *http.Request) {
 		"summary": summary,
 	})
 }
+
+// DraftDocument handles POST /api/ai/draft-document
+// Accepts JSON {"case_id": "uuid", "template_type": "string", "instructions": "string", "language": "de|en|fr"}.
+func (h *AIHandler) DraftDocument(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	var body struct {
+		CaseID       string `json:"case_id"`
+		TemplateType string `json:"template_type"`
+		Instructions string `json:"instructions"`
+		Language     string `json:"language"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if body.CaseID == "" {
+		writeError(w, http.StatusBadRequest, "case_id is required")
+		return
+	}
+	if body.TemplateType == "" {
+		writeError(w, http.StatusBadRequest, "template_type is required")
+		return
+	}
+
+	caseID, err := parseUUID(body.CaseID)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case_id")
+		return
+	}
+
+	if len(body.Instructions) > maxDescriptionLen {
+		writeError(w, http.StatusBadRequest, "instructions exceeds maximum length")
+		return
+	}
+
+	draft, err := h.ai.DraftDocument(r.Context(), tenantID, caseID, body.TemplateType, body.Instructions, body.Language)
+	if err != nil {
+		internalError(w, "AI document drafting failed", err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, draft)
+}
+
+// CaseStrategy handles POST /api/ai/case-strategy
+// Accepts JSON {"case_id": "uuid"}.
+func (h *AIHandler) CaseStrategy(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	var body struct {
+		CaseID string `json:"case_id"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if body.CaseID == "" {
+		writeError(w, http.StatusBadRequest, "case_id is required")
+		return
+	}
+
+	caseID, err := parseUUID(body.CaseID)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case_id")
+		return
+	}
+
+	strategy, err := h.ai.CaseStrategy(r.Context(), tenantID, caseID)
+	if err != nil {
+		internalError(w, "AI case strategy analysis failed", err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, strategy)
+}
+
+// SimilarCases handles POST /api/ai/similar-cases
+// Accepts JSON {"case_id": "uuid", "description": "string"}.
+func (h *AIHandler) SimilarCases(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	var body struct {
+		CaseID      string `json:"case_id"`
+		Description string `json:"description"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	if body.CaseID == "" && body.Description == "" {
+		writeError(w, http.StatusBadRequest, "either case_id or description is required")
+		return
+	}
+
+	if len(body.Description) > maxDescriptionLen {
+		writeError(w, http.StatusBadRequest, "description exceeds maximum length")
+		return
+	}
+
+	var caseID uuid.UUID
+	if body.CaseID != "" {
+		var err error
+		caseID, err = parseUUID(body.CaseID)
+		if err != nil {
+			writeError(w, http.StatusBadRequest, "invalid case_id")
+			return
+		}
+	}
+
+	cases, err := h.ai.FindSimilarCases(r.Context(), tenantID, caseID, body.Description)
+	if err != nil {
+		internalError(w, "AI similar case search failed", err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"cases": cases,
+		"count": len(cases),
+	})
+}
--- a/backend/internal/handlers/billing_rates.go
+++ b/backend/internal/handlers/billing_rates.go
@@ -1,66 +0,0 @@
-package handlers
-
-import (
-	"encoding/json"
-	"net/http"
-
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
-)
-
-type BillingRateHandler struct {
-	svc *services.BillingRateService
-}
-
-func NewBillingRateHandler(svc *services.BillingRateService) *BillingRateHandler {
-	return &BillingRateHandler{svc: svc}
-}
-
-// List handles GET /api/billing-rates
-func (h *BillingRateHandler) List(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	rates, err := h.svc.List(r.Context(), tenantID)
-	if err != nil {
-		internalError(w, "failed to list billing rates", err)
-		return
-	}
-
-	writeJSON(w, http.StatusOK, map[string]any{"billing_rates": rates})
-}
-
-// Upsert handles PUT /api/billing-rates
-func (h *BillingRateHandler) Upsert(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	var input services.UpsertBillingRateInput
-	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid JSON body")
-		return
-	}
-
-	if input.Rate < 0 {
-		writeError(w, http.StatusBadRequest, "rate must be non-negative")
-		return
-	}
-	if input.ValidFrom == "" {
-		writeError(w, http.StatusBadRequest, "valid_from is required")
-		return
-	}
-
-	rate, err := h.svc.Upsert(r.Context(), tenantID, input)
-	if err != nil {
-		internalError(w, "failed to upsert billing rate", err)
-		return
-	}
-
-	writeJSON(w, http.StatusOK, rate)
-}
--- a/backend/internal/handlers/deadlines.go
+++ b/backend/internal/handlers/deadlines.go
@@ -198,9 +198,8 @@ func (h *DeadlineHandlers) Delete(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	err = h.deadlines.Delete(r.Context(), tenantID, deadlineID)
-	if err != nil {
-		writeError(w, http.StatusNotFound, err.Error())
+	if err := h.deadlines.Delete(r.Context(), tenantID, deadlineID); err != nil {
+		writeError(w, http.StatusNotFound, "deadline not found")
 		return
 	}

--- a/backend/internal/handlers/invoices.go
+++ b/backend/internal/handlers/invoices.go
@@ -1,170 +0,0 @@
-package handlers
-
-import (
-	"encoding/json"
-	"net/http"
-
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
-
-	"github.com/google/uuid"
-)
-
-type InvoiceHandler struct {
-	svc *services.InvoiceService
-}
-
-func NewInvoiceHandler(svc *services.InvoiceService) *InvoiceHandler {
-	return &InvoiceHandler{svc: svc}
-}
-
-// List handles GET /api/invoices?case_id=&status=
-func (h *InvoiceHandler) List(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	var caseID *uuid.UUID
-	if caseStr := r.URL.Query().Get("case_id"); caseStr != "" {
-		parsed, err := uuid.Parse(caseStr)
-		if err != nil {
-			writeError(w, http.StatusBadRequest, "invalid case_id")
-			return
-		}
-		caseID = &parsed
-	}
-
-	invoices, err := h.svc.List(r.Context(), tenantID, caseID, r.URL.Query().Get("status"))
-	if err != nil {
-		internalError(w, "failed to list invoices", err)
-		return
-	}
-
-	writeJSON(w, http.StatusOK, map[string]any{"invoices": invoices})
-}
-
-// Get handles GET /api/invoices/{id}
-func (h *InvoiceHandler) Get(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	invoiceID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid invoice ID")
-		return
-	}
-
-	inv, err := h.svc.GetByID(r.Context(), tenantID, invoiceID)
-	if err != nil {
-		internalError(w, "failed to get invoice", err)
-		return
-	}
-	if inv == nil {
-		writeError(w, http.StatusNotFound, "invoice not found")
-		return
-	}
-
-	writeJSON(w, http.StatusOK, inv)
-}
-
-// Create handles POST /api/invoices
-func (h *InvoiceHandler) Create(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-	userID, _ := auth.UserFromContext(r.Context())
-
-	var input services.CreateInvoiceInput
-	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid JSON body")
-		return
-	}
-
-	if input.ClientName == "" {
-		writeError(w, http.StatusBadRequest, "client_name is required")
-		return
-	}
-	if input.CaseID == uuid.Nil {
-		writeError(w, http.StatusBadRequest, "case_id is required")
-		return
-	}
-
-	inv, err := h.svc.Create(r.Context(), tenantID, userID, input)
-	if err != nil {
-		internalError(w, "failed to create invoice", err)
-		return
-	}
-
-	writeJSON(w, http.StatusCreated, inv)
-}
-
-// Update handles PUT /api/invoices/{id}
-func (h *InvoiceHandler) Update(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	invoiceID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid invoice ID")
-		return
-	}
-
-	var input services.UpdateInvoiceInput
-	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid JSON body")
-		return
-	}
-
-	inv, err := h.svc.Update(r.Context(), tenantID, invoiceID, input)
-	if err != nil {
-		writeError(w, http.StatusBadRequest, err.Error())
-		return
-	}
-
-	writeJSON(w, http.StatusOK, inv)
-}
-
-// UpdateStatus handles PATCH /api/invoices/{id}/status
-func (h *InvoiceHandler) UpdateStatus(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	invoiceID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid invoice ID")
-		return
-	}
-
-	var body struct {
-		Status string `json:"status"`
-	}
-	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid JSON body")
-		return
-	}
-	if body.Status == "" {
-		writeError(w, http.StatusBadRequest, "status is required")
-		return
-	}
-
-	inv, err := h.svc.UpdateStatus(r.Context(), tenantID, invoiceID, body.Status)
-	if err != nil {
-		writeError(w, http.StatusBadRequest, err.Error())
-		return
-	}
-
-	writeJSON(w, http.StatusOK, inv)
-}
--- a/backend/internal/handlers/time_entries.go
+++ b/backend/internal/handlers/time_entries.go
@@ -1,209 +0,0 @@
-package handlers
-
-import (
-	"encoding/json"
-	"net/http"
-	"strconv"
-
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
-
-	"github.com/google/uuid"
-)
-
-type TimeEntryHandler struct {
-	svc *services.TimeEntryService
-}
-
-func NewTimeEntryHandler(svc *services.TimeEntryService) *TimeEntryHandler {
-	return &TimeEntryHandler{svc: svc}
-}
-
-// ListForCase handles GET /api/cases/{id}/time-entries
-func (h *TimeEntryHandler) ListForCase(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	caseID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid case ID")
-		return
-	}
-
-	entries, err := h.svc.ListForCase(r.Context(), tenantID, caseID)
-	if err != nil {
-		internalError(w, "failed to list time entries", err)
-		return
-	}
-
-	writeJSON(w, http.StatusOK, map[string]any{"time_entries": entries})
-}
-
-// List handles GET /api/time-entries?case_id=&user_id=&from=&to=
-func (h *TimeEntryHandler) List(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
-	offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
-	limit, offset = clampPagination(limit, offset)
-
-	filter := services.TimeEntryFilter{
-		From:   r.URL.Query().Get("from"),
-		To:     r.URL.Query().Get("to"),
-		Limit:  limit,
-		Offset: offset,
-	}
-
-	if caseStr := r.URL.Query().Get("case_id"); caseStr != "" {
-		caseID, err := uuid.Parse(caseStr)
-		if err != nil {
-			writeError(w, http.StatusBadRequest, "invalid case_id")
-			return
-		}
-		filter.CaseID = &caseID
-	}
-	if userStr := r.URL.Query().Get("user_id"); userStr != "" {
-		userID, err := uuid.Parse(userStr)
-		if err != nil {
-			writeError(w, http.StatusBadRequest, "invalid user_id")
-			return
-		}
-		filter.UserID = &userID
-	}
-
-	entries, total, err := h.svc.List(r.Context(), tenantID, filter)
-	if err != nil {
-		internalError(w, "failed to list time entries", err)
-		return
-	}
-
-	writeJSON(w, http.StatusOK, map[string]any{
-		"time_entries": entries,
-		"total":        total,
-	})
-}
-
-// Create handles POST /api/cases/{id}/time-entries
-func (h *TimeEntryHandler) Create(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-	userID, _ := auth.UserFromContext(r.Context())
-
-	caseID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid case ID")
-		return
-	}
-
-	var input services.CreateTimeEntryInput
-	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid JSON body")
-		return
-	}
-	input.CaseID = caseID
-
-	if input.Description == "" {
-		writeError(w, http.StatusBadRequest, "description is required")
-		return
-	}
-	if input.DurationMinutes <= 0 {
-		writeError(w, http.StatusBadRequest, "duration_minutes must be positive")
-		return
-	}
-	if input.Date == "" {
-		writeError(w, http.StatusBadRequest, "date is required")
-		return
-	}
-
-	entry, err := h.svc.Create(r.Context(), tenantID, userID, input)
-	if err != nil {
-		internalError(w, "failed to create time entry", err)
-		return
-	}
-
-	writeJSON(w, http.StatusCreated, entry)
-}
-
-// Update handles PUT /api/time-entries/{id}
-func (h *TimeEntryHandler) Update(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	entryID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid time entry ID")
-		return
-	}
-
-	var input services.UpdateTimeEntryInput
-	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid JSON body")
-		return
-	}
-
-	entry, err := h.svc.Update(r.Context(), tenantID, entryID, input)
-	if err != nil {
-		writeError(w, http.StatusBadRequest, err.Error())
-		return
-	}
-
-	writeJSON(w, http.StatusOK, entry)
-}
-
-// Delete handles DELETE /api/time-entries/{id}
-func (h *TimeEntryHandler) Delete(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	entryID, err := parsePathUUID(r, "id")
-	if err != nil {
-		writeError(w, http.StatusBadRequest, "invalid time entry ID")
-		return
-	}
-
-	if err := h.svc.Delete(r.Context(), tenantID, entryID); err != nil {
-		writeError(w, http.StatusBadRequest, err.Error())
-		return
-	}
-
-	writeJSON(w, http.StatusOK, map[string]string{"status": "deleted"})
-}
-
-// Summary handles GET /api/time-entries/summary?group_by=case|user|month&from=&to=
-func (h *TimeEntryHandler) Summary(w http.ResponseWriter, r *http.Request) {
-	tenantID, ok := auth.TenantFromContext(r.Context())
-	if !ok {
-		writeError(w, http.StatusForbidden, "missing tenant")
-		return
-	}
-
-	groupBy := r.URL.Query().Get("group_by")
-	if groupBy == "" {
-		groupBy = "case"
-	}
-
-	summaries, err := h.svc.Summary(r.Context(), tenantID, groupBy,
-		r.URL.Query().Get("from"), r.URL.Query().Get("to"))
-	if err != nil {
-		internalError(w, "failed to get summary", err)
-		return
-	}
-
-	writeJSON(w, http.StatusOK, map[string]any{"summary": summaries})
-}
--- a/backend/internal/models/billing_rate.go
+++ b/backend/internal/models/billing_rate.go
@@ -1,18 +0,0 @@
-package models
-
-import (
-	"time"
-
-	"github.com/google/uuid"
-)
-
-type BillingRate struct {
-	ID        uuid.UUID  `db:"id" json:"id"`
-	TenantID  uuid.UUID  `db:"tenant_id" json:"tenant_id"`
-	UserID    *uuid.UUID `db:"user_id" json:"user_id,omitempty"`
-	Rate      float64    `db:"rate" json:"rate"`
-	Currency  string     `db:"currency" json:"currency"`
-	ValidFrom string     `db:"valid_from" json:"valid_from"`
-	ValidTo   *string    `db:"valid_to" json:"valid_to,omitempty"`
-	CreatedAt time.Time  `db:"created_at" json:"created_at"`
-}
--- a/backend/internal/models/invoice.go
+++ b/backend/internal/models/invoice.go
@@ -1,38 +0,0 @@
-package models
-
-import (
-	"encoding/json"
-	"time"
-
-	"github.com/google/uuid"
-)
-
-type Invoice struct {
-	ID            uuid.UUID       `db:"id" json:"id"`
-	TenantID      uuid.UUID       `db:"tenant_id" json:"tenant_id"`
-	CaseID        uuid.UUID       `db:"case_id" json:"case_id"`
-	InvoiceNumber string          `db:"invoice_number" json:"invoice_number"`
-	ClientName    string          `db:"client_name" json:"client_name"`
-	ClientAddress *string         `db:"client_address" json:"client_address,omitempty"`
-	Items         json.RawMessage `db:"items" json:"items"`
-	Subtotal      float64         `db:"subtotal" json:"subtotal"`
-	TaxRate       float64         `db:"tax_rate" json:"tax_rate"`
-	TaxAmount     float64         `db:"tax_amount" json:"tax_amount"`
-	Total         float64         `db:"total" json:"total"`
-	Status        string          `db:"status" json:"status"`
-	IssuedAt      *string         `db:"issued_at" json:"issued_at,omitempty"`
-	DueAt         *string         `db:"due_at" json:"due_at,omitempty"`
-	PaidAt        *time.Time      `db:"paid_at" json:"paid_at,omitempty"`
-	Notes         *string         `db:"notes" json:"notes,omitempty"`
-	CreatedBy     uuid.UUID       `db:"created_by" json:"created_by"`
-	CreatedAt     time.Time       `db:"created_at" json:"created_at"`
-	UpdatedAt     time.Time       `db:"updated_at" json:"updated_at"`
-}
-
-type InvoiceItem struct {
-	Description     string  `json:"description"`
-	DurationMinutes int     `json:"duration_minutes,omitempty"`
-	HourlyRate      float64 `json:"hourly_rate,omitempty"`
-	Amount          float64 `json:"amount"`
-	TimeEntryID     *string `json:"time_entry_id,omitempty"`
-}
--- a/backend/internal/models/time_entry.go
+++ b/backend/internal/models/time_entry.go
@@ -1,24 +0,0 @@
-package models
-
-import (
-	"time"
-
-	"github.com/google/uuid"
-)
-
-type TimeEntry struct {
-	ID              uuid.UUID  `db:"id" json:"id"`
-	TenantID        uuid.UUID  `db:"tenant_id" json:"tenant_id"`
-	CaseID          uuid.UUID  `db:"case_id" json:"case_id"`
-	UserID          uuid.UUID  `db:"user_id" json:"user_id"`
-	Date            string     `db:"date" json:"date"`
-	DurationMinutes int        `db:"duration_minutes" json:"duration_minutes"`
-	Description     string     `db:"description" json:"description"`
-	Activity        *string    `db:"activity" json:"activity,omitempty"`
-	Billable        bool       `db:"billable" json:"billable"`
-	Billed          bool       `db:"billed" json:"billed"`
-	InvoiceID       *uuid.UUID `db:"invoice_id" json:"invoice_id,omitempty"`
-	HourlyRate      *float64   `db:"hourly_rate" json:"hourly_rate,omitempty"`
-	CreatedAt       time.Time  `db:"created_at" json:"created_at"`
-	UpdatedAt       time.Time  `db:"updated_at" json:"updated_at"`
-}
--- a/backend/internal/router/router.go
+++ b/backend/internal/router/router.go
@@ -15,7 +15,7 @@ import (
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )

-func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *services.CalDAVService, notifSvc *services.NotificationService) http.Handler {
+func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *services.CalDAVService, notifSvc *services.NotificationService, youpcDB ...*sqlx.DB) http.Handler {
 	mux := http.NewServeMux()

 	// Services
@@ -31,14 +31,15 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	storageCli := services.NewStorageClient(cfg.SupabaseURL, cfg.SupabaseServiceKey)
 	documentSvc := services.NewDocumentService(db, storageCli, auditSvc)
 	assignmentSvc := services.NewCaseAssignmentService(db)
-	timeEntrySvc := services.NewTimeEntryService(db, auditSvc)
-	billingRateSvc := services.NewBillingRateService(db, auditSvc)
-	invoiceSvc := services.NewInvoiceService(db, auditSvc)

 	// AI service (optional — only if API key is configured)
 	var aiH *handlers.AIHandler
 	if cfg.AnthropicAPIKey != "" {
-		aiSvc := services.NewAIService(cfg.AnthropicAPIKey, db)
+		var ydb *sqlx.DB
+		if len(youpcDB) > 0 {
+			ydb = youpcDB[0]
+		}
+		aiSvc := services.NewAIService(cfg.AnthropicAPIKey, db, ydb)
 		aiH = handlers.NewAIHandler(aiSvc)
 	}

@@ -68,9 +69,6 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	eventH := handlers.NewCaseEventHandler(db)
 	docH := handlers.NewDocumentHandler(documentSvc)
 	assignmentH := handlers.NewCaseAssignmentHandler(assignmentSvc)
-	timeEntryH := handlers.NewTimeEntryHandler(timeEntrySvc)
-	billingRateH := handlers.NewBillingRateHandler(billingRateSvc)
-	invoiceH := handlers.NewInvoiceHandler(invoiceSvc)

 	// Public routes
 	mux.HandleFunc("GET /health", handleHealth(db))
@@ -112,7 +110,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	scoped.HandleFunc("GET /api/cases", caseH.List)
 	scoped.HandleFunc("POST /api/cases", perm(auth.PermCreateCase, caseH.Create))
 	scoped.HandleFunc("GET /api/cases/{id}", caseH.Get)
-	scoped.HandleFunc("PUT /api/cases/{id}", caseH.Update)
+	scoped.HandleFunc("PUT /api/cases/{id}", caseH.Update)    // case-level access checked in handler
 	scoped.HandleFunc("DELETE /api/cases/{id}", perm(auth.PermCreateCase, caseH.Delete))

 	// Parties — same access as case editing
@@ -162,21 +160,24 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 	// Dashboard — all can view
 	scoped.HandleFunc("GET /api/dashboard", dashboardH.Get)

-	// Audit log — view requires PermViewAuditLog
-	scoped.HandleFunc("GET /api/audit-log", perm(auth.PermViewAuditLog, auditH.List))
+	// Audit log
+	scoped.HandleFunc("GET /api/audit-log", auditH.List)

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

 	// AI endpoints (rate limited: 5 req/min burst 10 per IP)
 	if aiH != nil {
 		aiLimiter := middleware.NewTokenBucket(5.0/60.0, 10)
 		scoped.HandleFunc("POST /api/ai/extract-deadlines", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.ExtractDeadlines)))
 		scoped.HandleFunc("POST /api/ai/summarize-case", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.SummarizeCase)))
+		scoped.HandleFunc("POST /api/ai/draft-document", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.DraftDocument)))
+		scoped.HandleFunc("POST /api/ai/case-strategy", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.CaseStrategy)))
+		scoped.HandleFunc("POST /api/ai/similar-cases", perm(auth.PermAIExtraction, aiLimiter.LimitFunc(aiH.SimilarCases)))
 	}

 	// Notifications
@@ -196,25 +197,6 @@ func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config, calDAVSvc *se
 		scoped.HandleFunc("GET /api/caldav/status", calDAVH.GetStatus)
 	}

-	// Time entries — billing permission for create/update/delete
-	scoped.HandleFunc("GET /api/cases/{id}/time-entries", timeEntryH.ListForCase)
-	scoped.HandleFunc("POST /api/cases/{id}/time-entries", perm(auth.PermManageBilling, timeEntryH.Create))
-	scoped.HandleFunc("GET /api/time-entries", timeEntryH.List)
-	scoped.HandleFunc("GET /api/time-entries/summary", perm(auth.PermManageBilling, timeEntryH.Summary))
-	scoped.HandleFunc("PUT /api/time-entries/{id}", perm(auth.PermManageBilling, timeEntryH.Update))
-	scoped.HandleFunc("DELETE /api/time-entries/{id}", perm(auth.PermManageBilling, timeEntryH.Delete))
-
-	// Billing rates — billing permission required
-	scoped.HandleFunc("GET /api/billing-rates", perm(auth.PermManageBilling, billingRateH.List))
-	scoped.HandleFunc("PUT /api/billing-rates", perm(auth.PermManageBilling, billingRateH.Upsert))
-
-	// Invoices — billing permission required
-	scoped.HandleFunc("GET /api/invoices", perm(auth.PermManageBilling, invoiceH.List))
-	scoped.HandleFunc("POST /api/invoices", perm(auth.PermManageBilling, invoiceH.Create))
-	scoped.HandleFunc("GET /api/invoices/{id}", perm(auth.PermManageBilling, invoiceH.Get))
-	scoped.HandleFunc("PUT /api/invoices/{id}", perm(auth.PermManageBilling, invoiceH.Update))
-	scoped.HandleFunc("PATCH /api/invoices/{id}/status", perm(auth.PermManageBilling, invoiceH.UpdateStatus))
-
 	// Wire: auth -> tenant routes go directly, scoped routes get tenant resolver
 	api.Handle("/api/", tenantResolver.Resolve(scoped))

--- a/backend/internal/services/ai_service.go
+++ b/backend/internal/services/ai_service.go
@@ -5,6 +5,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"

 	"github.com/anthropics/anthropic-sdk-go"
@@ -18,11 +19,12 @@ import (
 type AIService struct {
 	client anthropic.Client
 	db     *sqlx.DB
+	youpcDB *sqlx.DB // read-only connection to youpc.org for similar case finder (may be nil)
 }

-func NewAIService(apiKey string, db *sqlx.DB) *AIService {
+func NewAIService(apiKey string, db *sqlx.DB, youpcDB *sqlx.DB) *AIService {
 	client := anthropic.NewClient(option.WithAPIKey(apiKey))
-	return &AIService{client: client, db: db}
+	return &AIService{client: client, db: db, youpcDB: youpcDB}
 }

 // ExtractedDeadline represents a deadline extracted by AI from a document.
@@ -281,3 +283,726 @@ func (s *AIService) SummarizeCase(ctx context.Context, tenantID, caseID uuid.UUI

 	return summary, nil
 }
+
+// --- Document Drafting ---
+
+// DocumentDraft represents an AI-generated document draft.
+type DocumentDraft struct {
+	Title    string `json:"title"`
+	Content  string `json:"content"`
+	Language string `json:"language"`
+}
+
+// templateDescriptions maps template type IDs to descriptions for Claude.
+var templateDescriptions = map[string]string{
+	"klageschrift":      "Klageschrift (Statement of Claim) — formal complaint initiating legal proceedings",
+	"klageerwiderung":   "Klageerwiderung (Statement of Defence) — formal response to a statement of claim",
+	"abmahnung":         "Abmahnung (Cease and Desist Letter) — formal warning letter demanding cessation of an activity",
+	"schriftsatz":       "Schriftsatz (Legal Brief) — formal legal submission to the court",
+	"berufung":          "Berufungsschrift (Appeal Brief) — formal appeal against a court decision",
+	"antrag":            "Antrag (Motion/Application) — formal application or motion to the court",
+	"stellungnahme":     "Stellungnahme (Statement/Position Paper) — formal response or position paper",
+	"gutachten":         "Gutachten (Legal Opinion/Expert Report) — detailed legal analysis or opinion",
+	"vertrag":           "Vertrag (Contract/Agreement) — legal contract or agreement between parties",
+	"vollmacht":         "Vollmacht (Power of Attorney) — formal authorization document",
+	"upc_claim":         "UPC Statement of Claim — claim filed at the Unified Patent Court",
+	"upc_defence":       "UPC Statement of Defence — defence filed at the Unified Patent Court",
+	"upc_counterclaim":  "UPC Counterclaim for Revocation — counterclaim for patent revocation at the UPC",
+	"upc_injunction":    "UPC Application for Provisional Measures — application for injunctive relief at the UPC",
+}
+
+const draftDocumentSystemPrompt = `You are an expert legal document drafter for German and UPC (Unified Patent Court) patent litigation.
+
+You draft professional legal documents in the requested language, following proper legal formatting conventions.
+
+Guidelines:
+- Use proper legal structure with numbered sections and paragraphs
+- Include standard legal formalities (headers, salutations, signatures block)
+- Reference relevant legal provisions (BGB, ZPO, UPC Rules of Procedure, etc.)
+- Use precise legal terminology appropriate for the jurisdiction
+- Include placeholders in [BRACKETS] for information that needs to be filled in
+- Base the content on the provided case data and instructions
+- Output the document as clean text with proper formatting`
+
+// DraftDocument generates an AI-drafted legal document based on case data and a template type.
+func (s *AIService) DraftDocument(ctx context.Context, tenantID, caseID uuid.UUID, templateType, instructions, language string) (*DocumentDraft, error) {
+	if language == "" {
+		language = "de"
+	}
+
+	langLabel := "German"
+	if language == "en" {
+		langLabel = "English"
+	} else if language == "fr" {
+		langLabel = "French"
+	}
+
+	// Load case data
+	var c models.Case
+	if err := s.db.GetContext(ctx, &c,
+		"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID); err != nil {
+		return nil, fmt.Errorf("loading case: %w", err)
+	}
+
+	// Load parties
+	var parties []models.Party
+	_ = s.db.SelectContext(ctx, &parties,
+		"SELECT * FROM parties WHERE case_id = $1 AND tenant_id = $2", caseID, tenantID)
+
+	// Load recent events
+	var events []models.CaseEvent
+	_ = s.db.SelectContext(ctx, &events,
+		"SELECT * FROM case_events WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 15",
+		caseID, tenantID)
+
+	// Load active deadlines
+	var deadlines []models.Deadline
+	_ = s.db.SelectContext(ctx, &deadlines,
+		"SELECT * FROM deadlines WHERE case_id = $1 AND tenant_id = $2 AND status = 'active' ORDER BY due_date ASC LIMIT 10",
+		caseID, tenantID)
+
+	// Load documents metadata for context
+	var documents []models.Document
+	_ = s.db.SelectContext(ctx, &documents,
+		"SELECT id, title, doc_type, created_at FROM documents WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 10",
+		caseID, tenantID)
+
+	// Build context
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf("Case: %s — %s\nStatus: %s\n", c.CaseNumber, c.Title, c.Status))
+	if c.Court != nil {
+		b.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+	}
+	if c.CourtRef != nil {
+		b.WriteString(fmt.Sprintf("Court Reference: %s\n", *c.CourtRef))
+	}
+	if c.CaseType != nil {
+		b.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+	}
+
+	if len(parties) > 0 {
+		b.WriteString("\nParties:\n")
+		for _, p := range parties {
+			role := "unknown role"
+			if p.Role != nil {
+				role = *p.Role
+			}
+			b.WriteString(fmt.Sprintf("- %s (%s)", p.Name, role))
+			if p.Representative != nil {
+				b.WriteString(fmt.Sprintf(" — represented by %s", *p.Representative))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(events) > 0 {
+		b.WriteString("\nRecent Events:\n")
+		for _, e := range events {
+			b.WriteString(fmt.Sprintf("- [%s] %s", e.CreatedAt.Format("2006-01-02"), e.Title))
+			if e.Description != nil {
+				b.WriteString(fmt.Sprintf(": %s", *e.Description))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(deadlines) > 0 {
+		b.WriteString("\nUpcoming Deadlines:\n")
+		for _, d := range deadlines {
+			b.WriteString(fmt.Sprintf("- %s: due %s\n", d.Title, d.DueDate))
+		}
+	}
+
+	templateDesc, ok := templateDescriptions[templateType]
+	if !ok {
+		templateDesc = templateType
+	}
+
+	prompt := fmt.Sprintf(`Draft a %s for this case in %s.
+
+Document type: %s
+
+Case context:
+%s
+Additional instructions from the lawyer:
+%s
+
+Generate the complete document now.`, templateDesc, langLabel, templateDesc, b.String(), instructions)
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeSonnet4_20250514,
+		MaxTokens: 8192,
+		System: []anthropic.TextBlockParam{
+			{Text: draftDocumentSystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock(prompt)),
+		},
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	var content string
+	for _, block := range msg.Content {
+		if block.Type == "text" {
+			content += block.Text
+		}
+	}
+	if content == "" {
+		return nil, fmt.Errorf("empty response from Claude")
+	}
+
+	title := fmt.Sprintf("%s — %s", templateDesc, c.CaseNumber)
+	return &DocumentDraft{
+		Title:    title,
+		Content:  content,
+		Language: language,
+	}, nil
+}
+
+// --- Case Strategy ---
+
+// StrategyRecommendation represents an AI-generated case strategy analysis.
+type StrategyRecommendation struct {
+	Summary        string           `json:"summary"`
+	NextSteps      []StrategyStep   `json:"next_steps"`
+	RiskAssessment []RiskItem       `json:"risk_assessment"`
+	Timeline       []TimelineItem   `json:"timeline"`
+}
+
+type StrategyStep struct {
+	Priority    string `json:"priority"` // high, medium, low
+	Action      string `json:"action"`
+	Reasoning   string `json:"reasoning"`
+	Deadline    string `json:"deadline,omitempty"`
+}
+
+type RiskItem struct {
+	Level       string `json:"level"` // high, medium, low
+	Risk        string `json:"risk"`
+	Mitigation  string `json:"mitigation"`
+}
+
+type TimelineItem struct {
+	Date        string `json:"date"`
+	Event       string `json:"event"`
+	Importance  string `json:"importance"` // critical, important, routine
+}
+
+type strategyToolInput struct {
+	Summary        string         `json:"summary"`
+	NextSteps      []StrategyStep `json:"next_steps"`
+	RiskAssessment []RiskItem     `json:"risk_assessment"`
+	Timeline       []TimelineItem `json:"timeline"`
+}
+
+var caseStrategyTool = anthropic.ToolParam{
+	Name:        "case_strategy",
+	Description: anthropic.String("Provide strategic case analysis with next steps, risk assessment, and timeline optimization."),
+	InputSchema: anthropic.ToolInputSchemaParam{
+		Properties: map[string]any{
+			"summary": map[string]any{
+				"type":        "string",
+				"description": "Executive summary of the case situation and strategic outlook (2-4 sentences)",
+			},
+			"next_steps": map[string]any{
+				"type":        "array",
+				"description": "Recommended next actions in priority order",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"priority": map[string]any{
+							"type": "string",
+							"enum": []string{"high", "medium", "low"},
+						},
+						"action": map[string]any{
+							"type":        "string",
+							"description": "Specific recommended action",
+						},
+						"reasoning": map[string]any{
+							"type":        "string",
+							"description": "Why this action is recommended",
+						},
+						"deadline": map[string]any{
+							"type":        "string",
+							"description": "Suggested deadline in YYYY-MM-DD format, if applicable",
+						},
+					},
+					"required": []string{"priority", "action", "reasoning"},
+				},
+			},
+			"risk_assessment": map[string]any{
+				"type":        "array",
+				"description": "Key risks and mitigation strategies",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"level": map[string]any{
+							"type": "string",
+							"enum": []string{"high", "medium", "low"},
+						},
+						"risk": map[string]any{
+							"type":        "string",
+							"description": "Description of the risk",
+						},
+						"mitigation": map[string]any{
+							"type":        "string",
+							"description": "Recommended mitigation strategy",
+						},
+					},
+					"required": []string{"level", "risk", "mitigation"},
+				},
+			},
+			"timeline": map[string]any{
+				"type":        "array",
+				"description": "Optimized timeline of upcoming milestones and events",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"date": map[string]any{
+							"type":        "string",
+							"description": "Date in YYYY-MM-DD format",
+						},
+						"event": map[string]any{
+							"type":        "string",
+							"description": "Description of the milestone or event",
+						},
+						"importance": map[string]any{
+							"type": "string",
+							"enum": []string{"critical", "important", "routine"},
+						},
+					},
+					"required": []string{"date", "event", "importance"},
+				},
+			},
+		},
+		Required: []string{"summary", "next_steps", "risk_assessment", "timeline"},
+	},
+}
+
+const caseStrategySystemPrompt = `You are a senior litigation strategist specializing in German law and UPC (Unified Patent Court) patent proceedings.
+
+Analyze the case thoroughly and provide:
+1. An executive summary of the current strategic position
+2. Prioritized next steps with clear reasoning
+3. Risk assessment with mitigation strategies
+4. An optimized timeline of upcoming milestones
+
+Consider:
+- Procedural deadlines and their implications
+- Strength of the parties' positions based on available information
+- Potential settlement opportunities
+- Cost-efficiency of different strategic approaches
+- UPC-specific procedural peculiarities if applicable (bifurcation, preliminary injunctions, etc.)
+
+Be practical and actionable. Avoid generic advice — tailor recommendations to the specific case data provided.`
+
+// CaseStrategy analyzes a case and returns strategic recommendations.
+func (s *AIService) CaseStrategy(ctx context.Context, tenantID, caseID uuid.UUID) (*StrategyRecommendation, error) {
+	// Load case
+	var c models.Case
+	if err := s.db.GetContext(ctx, &c,
+		"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID); err != nil {
+		return nil, fmt.Errorf("loading case: %w", err)
+	}
+
+	// Load parties
+	var parties []models.Party
+	_ = s.db.SelectContext(ctx, &parties,
+		"SELECT * FROM parties WHERE case_id = $1 AND tenant_id = $2", caseID, tenantID)
+
+	// Load all events
+	var events []models.CaseEvent
+	_ = s.db.SelectContext(ctx, &events,
+		"SELECT * FROM case_events WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 25",
+		caseID, tenantID)
+
+	// Load all deadlines (active + completed for context)
+	var deadlines []models.Deadline
+	_ = s.db.SelectContext(ctx, &deadlines,
+		"SELECT * FROM deadlines WHERE case_id = $1 AND tenant_id = $2 ORDER BY due_date ASC LIMIT 20",
+		caseID, tenantID)
+
+	// Load documents metadata
+	var documents []models.Document
+	_ = s.db.SelectContext(ctx, &documents,
+		"SELECT id, title, doc_type, created_at FROM documents WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 15",
+		caseID, tenantID)
+
+	// Build comprehensive context
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf("Case: %s — %s\nStatus: %s\n", c.CaseNumber, c.Title, c.Status))
+	if c.Court != nil {
+		b.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+	}
+	if c.CourtRef != nil {
+		b.WriteString(fmt.Sprintf("Court Reference: %s\n", *c.CourtRef))
+	}
+	if c.CaseType != nil {
+		b.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+	}
+
+	if len(parties) > 0 {
+		b.WriteString("\nParties:\n")
+		for _, p := range parties {
+			role := "unknown"
+			if p.Role != nil {
+				role = *p.Role
+			}
+			b.WriteString(fmt.Sprintf("- %s (%s)", p.Name, role))
+			if p.Representative != nil {
+				b.WriteString(fmt.Sprintf(" — represented by %s", *p.Representative))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(events) > 0 {
+		b.WriteString("\nCase Events (chronological):\n")
+		for _, e := range events {
+			b.WriteString(fmt.Sprintf("- [%s] %s", e.CreatedAt.Format("2006-01-02"), e.Title))
+			if e.Description != nil {
+				b.WriteString(fmt.Sprintf(": %s", *e.Description))
+			}
+			b.WriteString("\n")
+		}
+	}
+
+	if len(deadlines) > 0 {
+		b.WriteString("\nDeadlines:\n")
+		for _, d := range deadlines {
+			b.WriteString(fmt.Sprintf("- %s: due %s (status: %s)\n", d.Title, d.DueDate, d.Status))
+		}
+	}
+
+	if len(documents) > 0 {
+		b.WriteString("\nDocuments on file:\n")
+		for _, d := range documents {
+			docType := ""
+			if d.DocType != nil {
+				docType = fmt.Sprintf(" [%s]", *d.DocType)
+			}
+			b.WriteString(fmt.Sprintf("- %s%s (%s)\n", d.Title, docType, d.CreatedAt.Format("2006-01-02")))
+		}
+	}
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeOpus4_6,
+		MaxTokens: 4096,
+		System: []anthropic.TextBlockParam{
+			{Text: caseStrategySystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock("Analyze this case and provide strategic recommendations:\n\n" + b.String())),
+		},
+		Tools: []anthropic.ToolUnionParam{
+			{OfTool: &caseStrategyTool},
+		},
+		ToolChoice: anthropic.ToolChoiceParamOfTool("case_strategy"),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	for _, block := range msg.Content {
+		if block.Type == "tool_use" && block.Name == "case_strategy" {
+			var input strategyToolInput
+			if err := json.Unmarshal(block.Input, &input); err != nil {
+				return nil, fmt.Errorf("parsing strategy output: %w", err)
+			}
+			result := &StrategyRecommendation{
+				Summary:        input.Summary,
+				NextSteps:      input.NextSteps,
+				RiskAssessment: input.RiskAssessment,
+				Timeline:       input.Timeline,
+			}
+			// Cache in database
+			strategyJSON, _ := json.Marshal(result)
+			_, _ = s.db.ExecContext(ctx,
+				"UPDATE cases SET ai_summary = $1, updated_at = $2 WHERE id = $3 AND tenant_id = $4",
+				string(strategyJSON), time.Now(), caseID, tenantID)
+			return result, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no tool_use block in response")
+}
+
+// --- Similar Case Finder ---
+
+// SimilarCase represents a UPC case found to be similar.
+type SimilarCase struct {
+	CaseNumber   string  `json:"case_number"`
+	Title        string  `json:"title"`
+	Court        string  `json:"court"`
+	Date         string  `json:"date"`
+	Relevance    float64 `json:"relevance"`    // 0.0-1.0
+	Explanation  string  `json:"explanation"`   // why this case is similar
+	KeyHoldings  string  `json:"key_holdings"`  // relevant holdings
+	URL          string  `json:"url,omitempty"` // link to youpc.org
+}
+
+// youpcCase represents a case from the youpc.org database.
+type youpcCase struct {
+	ID            string  `db:"id" json:"id"`
+	CaseNumber    *string `db:"case_number" json:"case_number"`
+	Title         *string `db:"title" json:"title"`
+	Court         *string `db:"court" json:"court"`
+	DecisionDate  *string `db:"decision_date" json:"decision_date"`
+	CaseType      *string `db:"case_type" json:"case_type"`
+	Outcome       *string `db:"outcome" json:"outcome"`
+	PatentNumbers *string `db:"patent_numbers" json:"patent_numbers"`
+	Summary       *string `db:"summary" json:"summary"`
+	Claimant      *string `db:"claimant" json:"claimant"`
+	Defendant     *string `db:"defendant" json:"defendant"`
+}
+
+type similarCaseToolInput struct {
+	Cases []struct {
+		CaseID      string  `json:"case_id"`
+		Relevance   float64 `json:"relevance"`
+		Explanation string  `json:"explanation"`
+		KeyHoldings string  `json:"key_holdings"`
+	} `json:"cases"`
+}
+
+var similarCaseTool = anthropic.ToolParam{
+	Name:        "rank_similar_cases",
+	Description: anthropic.String("Rank the provided UPC cases by relevance to the query case and explain why each is similar."),
+	InputSchema: anthropic.ToolInputSchemaParam{
+		Properties: map[string]any{
+			"cases": map[string]any{
+				"type":        "array",
+				"description": "UPC cases ranked by relevance (most relevant first)",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"case_id": map[string]any{
+							"type":        "string",
+							"description": "The ID of the UPC case from the provided list",
+						},
+						"relevance": map[string]any{
+							"type":        "number",
+							"minimum":     0,
+							"maximum":     1,
+							"description": "Relevance score from 0.0 to 1.0",
+						},
+						"explanation": map[string]any{
+							"type":        "string",
+							"description": "Why this case is relevant — what legal issues, parties, patents, or procedural aspects are similar",
+						},
+						"key_holdings": map[string]any{
+							"type":        "string",
+							"description": "Key holdings or legal principles from this case that are relevant",
+						},
+					},
+					"required": []string{"case_id", "relevance", "explanation", "key_holdings"},
+				},
+			},
+		},
+		Required: []string{"cases"},
+	},
+}
+
+const similarCaseSystemPrompt = `You are a UPC (Unified Patent Court) case law expert.
+
+Given a case description and a list of UPC cases from the database, rank the cases by relevance and explain why each one is similar or relevant.
+
+Consider:
+- Similar patents or technology areas
+- Same parties or representatives
+- Similar legal issues (infringement, validity, injunctions, etc.)
+- Similar procedural situations
+- Relevant legal principles that could apply
+
+Only include cases that are genuinely relevant (relevance > 0.3). Order by relevance descending.`
+
+// FindSimilarCases searches the youpc.org database for similar UPC cases.
+func (s *AIService) FindSimilarCases(ctx context.Context, tenantID, caseID uuid.UUID, description string) ([]SimilarCase, error) {
+	if s.youpcDB == nil {
+		return nil, fmt.Errorf("youpc.org database not configured")
+	}
+
+	// Build query context from the case (if provided) or description
+	var queryText string
+	if caseID != uuid.Nil {
+		var c models.Case
+		if err := s.db.GetContext(ctx, &c,
+			"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID); err != nil {
+			return nil, fmt.Errorf("loading case: %w", err)
+		}
+
+		var parties []models.Party
+		_ = s.db.SelectContext(ctx, &parties,
+			"SELECT * FROM parties WHERE case_id = $1 AND tenant_id = $2", caseID, tenantID)
+
+		var b strings.Builder
+		b.WriteString(fmt.Sprintf("Case: %s — %s\n", c.CaseNumber, c.Title))
+		if c.CaseType != nil {
+			b.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+		}
+		if c.Court != nil {
+			b.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+		}
+		for _, p := range parties {
+			role := ""
+			if p.Role != nil {
+				role = *p.Role
+			}
+			b.WriteString(fmt.Sprintf("Party: %s (%s)\n", p.Name, role))
+		}
+		if description != "" {
+			b.WriteString(fmt.Sprintf("\nAdditional context: %s\n", description))
+		}
+		queryText = b.String()
+	} else if description != "" {
+		queryText = description
+	} else {
+		return nil, fmt.Errorf("either case_id or description must be provided")
+	}
+
+	// Query youpc.org database for candidate cases
+	// Search by text similarity across case titles, summaries, party names
+	var candidates []youpcCase
+	err := s.youpcDB.SelectContext(ctx, &candidates, `
+		SELECT
+			id,
+			case_number,
+			title,
+			court,
+			decision_date,
+			case_type,
+			outcome,
+			patent_numbers,
+			summary,
+			claimant,
+			defendant
+		FROM mlex.cases
+		ORDER BY decision_date DESC NULLS LAST
+		LIMIT 50
+	`)
+	if err != nil {
+		return nil, fmt.Errorf("querying youpc.org cases: %w", err)
+	}
+
+	if len(candidates) == 0 {
+		return []SimilarCase{}, nil
+	}
+
+	// Build candidate list for Claude
+	var candidateText strings.Builder
+	for _, c := range candidates {
+		candidateText.WriteString(fmt.Sprintf("ID: %s\n", c.ID))
+		if c.CaseNumber != nil {
+			candidateText.WriteString(fmt.Sprintf("Case Number: %s\n", *c.CaseNumber))
+		}
+		if c.Title != nil {
+			candidateText.WriteString(fmt.Sprintf("Title: %s\n", *c.Title))
+		}
+		if c.Court != nil {
+			candidateText.WriteString(fmt.Sprintf("Court: %s\n", *c.Court))
+		}
+		if c.DecisionDate != nil {
+			candidateText.WriteString(fmt.Sprintf("Decision Date: %s\n", *c.DecisionDate))
+		}
+		if c.CaseType != nil {
+			candidateText.WriteString(fmt.Sprintf("Type: %s\n", *c.CaseType))
+		}
+		if c.Outcome != nil {
+			candidateText.WriteString(fmt.Sprintf("Outcome: %s\n", *c.Outcome))
+		}
+		if c.PatentNumbers != nil {
+			candidateText.WriteString(fmt.Sprintf("Patents: %s\n", *c.PatentNumbers))
+		}
+		if c.Claimant != nil {
+			candidateText.WriteString(fmt.Sprintf("Claimant: %s\n", *c.Claimant))
+		}
+		if c.Defendant != nil {
+			candidateText.WriteString(fmt.Sprintf("Defendant: %s\n", *c.Defendant))
+		}
+		if c.Summary != nil {
+			candidateText.WriteString(fmt.Sprintf("Summary: %s\n", *c.Summary))
+		}
+		candidateText.WriteString("---\n")
+	}
+
+	prompt := fmt.Sprintf(`Find UPC cases relevant to this matter:
+
+%s
+
+Here are the UPC cases from the database to evaluate:
+
+%s
+
+Rank only the genuinely relevant cases by similarity.`, queryText, candidateText.String())
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeSonnet4_20250514,
+		MaxTokens: 4096,
+		System: []anthropic.TextBlockParam{
+			{Text: similarCaseSystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock(prompt)),
+		},
+		Tools: []anthropic.ToolUnionParam{
+			{OfTool: &similarCaseTool},
+		},
+		ToolChoice: anthropic.ToolChoiceParamOfTool("rank_similar_cases"),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	for _, block := range msg.Content {
+		if block.Type == "tool_use" && block.Name == "rank_similar_cases" {
+			var input similarCaseToolInput
+			if err := json.Unmarshal(block.Input, &input); err != nil {
+				return nil, fmt.Errorf("parsing similar cases output: %w", err)
+			}
+
+			// Build lookup map for candidate data
+			candidateMap := make(map[string]youpcCase)
+			for _, c := range candidates {
+				candidateMap[c.ID] = c
+			}
+
+			var results []SimilarCase
+			for _, ranked := range input.Cases {
+				if ranked.Relevance < 0.3 {
+					continue
+				}
+				c, ok := candidateMap[ranked.CaseID]
+				if !ok {
+					continue
+				}
+				sc := SimilarCase{
+					Relevance:   ranked.Relevance,
+					Explanation: ranked.Explanation,
+					KeyHoldings: ranked.KeyHoldings,
+				}
+				if c.CaseNumber != nil {
+					sc.CaseNumber = *c.CaseNumber
+				}
+				if c.Title != nil {
+					sc.Title = *c.Title
+				}
+				if c.Court != nil {
+					sc.Court = *c.Court
+				}
+				if c.DecisionDate != nil {
+					sc.Date = *c.DecisionDate
+				}
+				if c.CaseNumber != nil {
+					sc.URL = fmt.Sprintf("https://youpc.org/cases/%s", *c.CaseNumber)
+				}
+				results = append(results, sc)
+			}
+
+			return results, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no tool_use block in response")
+}
--- a/backend/internal/services/billing_rate_service.go
+++ b/backend/internal/services/billing_rate_service.go
@@ -1,88 +0,0 @@
-package services
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/google/uuid"
-	"github.com/jmoiron/sqlx"
-
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
-)
-
-type BillingRateService struct {
-	db    *sqlx.DB
-	audit *AuditService
-}
-
-func NewBillingRateService(db *sqlx.DB, audit *AuditService) *BillingRateService {
-	return &BillingRateService{db: db, audit: audit}
-}
-
-type UpsertBillingRateInput struct {
-	UserID    *uuid.UUID `json:"user_id,omitempty"`
-	Rate      float64    `json:"rate"`
-	Currency  string     `json:"currency"`
-	ValidFrom string     `json:"valid_from"`
-	ValidTo   *string    `json:"valid_to,omitempty"`
-}
-
-func (s *BillingRateService) List(ctx context.Context, tenantID uuid.UUID) ([]models.BillingRate, error) {
-	var rates []models.BillingRate
-	err := s.db.SelectContext(ctx, &rates,
-		`SELECT id, tenant_id, user_id, rate, currency, valid_from, valid_to, created_at
-		 FROM billing_rates
-		 WHERE tenant_id = $1
-		 ORDER BY valid_from DESC, user_id NULLS LAST`,
-		tenantID)
-	if err != nil {
-		return nil, fmt.Errorf("list billing rates: %w", err)
-	}
-	return rates, nil
-}
-
-func (s *BillingRateService) Upsert(ctx context.Context, tenantID uuid.UUID, input UpsertBillingRateInput) (*models.BillingRate, error) {
-	if input.Currency == "" {
-		input.Currency = "EUR"
-	}
-
-	// Close any existing open-ended rate for this user
-	_, err := s.db.ExecContext(ctx,
-		`UPDATE billing_rates SET valid_to = $3
-		 WHERE tenant_id = $1
-		 AND (($2::uuid IS NULL AND user_id IS NULL) OR user_id = $2)
-		 AND valid_to IS NULL
-		 AND valid_from < $3`,
-		tenantID, input.UserID, input.ValidFrom)
-	if err != nil {
-		return nil, fmt.Errorf("close existing rate: %w", err)
-	}
-
-	var rate models.BillingRate
-	err = s.db.QueryRowxContext(ctx,
-		`INSERT INTO billing_rates (tenant_id, user_id, rate, currency, valid_from, valid_to)
-		 VALUES ($1, $2, $3, $4, $5, $6)
-		 RETURNING id, tenant_id, user_id, rate, currency, valid_from, valid_to, created_at`,
-		tenantID, input.UserID, input.Rate, input.Currency, input.ValidFrom, input.ValidTo,
-	).StructScan(&rate)
-	if err != nil {
-		return nil, fmt.Errorf("upsert billing rate: %w", err)
-	}
-
-	s.audit.Log(ctx, "create", "billing_rate", &rate.ID, nil, rate)
-	return &rate, nil
-}
-
-func (s *BillingRateService) GetCurrentRate(ctx context.Context, tenantID uuid.UUID, userID uuid.UUID, date string) (*float64, error) {
-	var rate float64
-	err := s.db.GetContext(ctx, &rate,
-		`SELECT rate FROM billing_rates
-		 WHERE tenant_id = $1 AND (user_id = $2 OR user_id IS NULL)
-		 AND valid_from <= $3 AND (valid_to IS NULL OR valid_to >= $3)
-		 ORDER BY user_id NULLS LAST LIMIT 1`,
-		tenantID, userID, date)
-	if err != nil {
-		return nil, err
-	}
-	return &rate, nil
-}
--- a/backend/internal/services/invoice_service.go
+++ b/backend/internal/services/invoice_service.go
@@ -1,292 +0,0 @@
-package services
-
-import (
-	"context"
-	"database/sql"
-	"encoding/json"
-	"fmt"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/jmoiron/sqlx"
-
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
-)
-
-type InvoiceService struct {
-	db    *sqlx.DB
-	audit *AuditService
-}
-
-func NewInvoiceService(db *sqlx.DB, audit *AuditService) *InvoiceService {
-	return &InvoiceService{db: db, audit: audit}
-}
-
-type CreateInvoiceInput struct {
-	CaseID        uuid.UUID             `json:"case_id"`
-	ClientName    string                `json:"client_name"`
-	ClientAddress *string               `json:"client_address,omitempty"`
-	Items         []models.InvoiceItem  `json:"items"`
-	TaxRate       *float64              `json:"tax_rate,omitempty"`
-	IssuedAt      *string               `json:"issued_at,omitempty"`
-	DueAt         *string               `json:"due_at,omitempty"`
-	Notes         *string               `json:"notes,omitempty"`
-	TimeEntryIDs  []uuid.UUID           `json:"time_entry_ids,omitempty"`
-}
-
-type UpdateInvoiceInput struct {
-	ClientName    *string               `json:"client_name,omitempty"`
-	ClientAddress *string               `json:"client_address,omitempty"`
-	Items         []models.InvoiceItem  `json:"items,omitempty"`
-	TaxRate       *float64              `json:"tax_rate,omitempty"`
-	IssuedAt      *string               `json:"issued_at,omitempty"`
-	DueAt         *string               `json:"due_at,omitempty"`
-	Notes         *string               `json:"notes,omitempty"`
-}
-
-const invoiceCols = `id, tenant_id, case_id, invoice_number, client_name, client_address,
-	items, subtotal, tax_rate, tax_amount, total, status, issued_at, due_at, paid_at, notes,
-	created_by, created_at, updated_at`
-
-func (s *InvoiceService) List(ctx context.Context, tenantID uuid.UUID, caseID *uuid.UUID, status string) ([]models.Invoice, error) {
-	where := "WHERE tenant_id = $1"
-	args := []any{tenantID}
-	argIdx := 2
-
-	if caseID != nil {
-		where += fmt.Sprintf(" AND case_id = $%d", argIdx)
-		args = append(args, *caseID)
-		argIdx++
-	}
-	if status != "" {
-		where += fmt.Sprintf(" AND status = $%d", argIdx)
-		args = append(args, status)
-		argIdx++
-	}
-
-	var invoices []models.Invoice
-	err := s.db.SelectContext(ctx, &invoices,
-		fmt.Sprintf("SELECT %s FROM invoices %s ORDER BY created_at DESC", invoiceCols, where),
-		args...)
-	if err != nil {
-		return nil, fmt.Errorf("list invoices: %w", err)
-	}
-	return invoices, nil
-}
-
-func (s *InvoiceService) GetByID(ctx context.Context, tenantID, invoiceID uuid.UUID) (*models.Invoice, error) {
-	var inv models.Invoice
-	err := s.db.GetContext(ctx, &inv,
-		`SELECT `+invoiceCols+` FROM invoices WHERE tenant_id = $1 AND id = $2`,
-		tenantID, invoiceID)
-	if err == sql.ErrNoRows {
-		return nil, nil
-	}
-	if err != nil {
-		return nil, fmt.Errorf("get invoice: %w", err)
-	}
-	return &inv, nil
-}
-
-func (s *InvoiceService) Create(ctx context.Context, tenantID, userID uuid.UUID, input CreateInvoiceInput) (*models.Invoice, error) {
-	tx, err := s.db.BeginTxx(ctx, nil)
-	if err != nil {
-		return nil, fmt.Errorf("begin tx: %w", err)
-	}
-	defer tx.Rollback()
-
-	// Generate invoice number: RE-YYYY-NNN
-	year := time.Now().Year()
-	var seq int
-	err = tx.GetContext(ctx, &seq,
-		`SELECT COUNT(*) + 1 FROM invoices WHERE tenant_id = $1 AND invoice_number LIKE $2`,
-		tenantID, fmt.Sprintf("RE-%d-%%", year))
-	if err != nil {
-		return nil, fmt.Errorf("generate invoice number: %w", err)
-	}
-	invoiceNumber := fmt.Sprintf("RE-%d-%03d", year, seq)
-
-	// Calculate totals
-	taxRate := 19.00
-	if input.TaxRate != nil {
-		taxRate = *input.TaxRate
-	}
-
-	var subtotal float64
-	for _, item := range input.Items {
-		subtotal += item.Amount
-	}
-	taxAmount := subtotal * taxRate / 100
-	total := subtotal + taxAmount
-
-	itemsJSON, err := json.Marshal(input.Items)
-	if err != nil {
-		return nil, fmt.Errorf("marshal items: %w", err)
-	}
-
-	var inv models.Invoice
-	err = tx.QueryRowxContext(ctx,
-		`INSERT INTO invoices (tenant_id, case_id, invoice_number, client_name, client_address,
-			items, subtotal, tax_rate, tax_amount, total, issued_at, due_at, notes, created_by)
-		 VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)
-		 RETURNING `+invoiceCols,
-		tenantID, input.CaseID, invoiceNumber, input.ClientName, input.ClientAddress,
-		itemsJSON, subtotal, taxRate, taxAmount, total, input.IssuedAt, input.DueAt, input.Notes, userID,
-	).StructScan(&inv)
-	if err != nil {
-		return nil, fmt.Errorf("create invoice: %w", err)
-	}
-
-	// Mark linked time entries as billed
-	if len(input.TimeEntryIDs) > 0 {
-		query, args, err := sqlx.In(
-			`UPDATE time_entries SET billed = true, invoice_id = ? WHERE tenant_id = ? AND id IN (?)`,
-			inv.ID, tenantID, input.TimeEntryIDs)
-		if err != nil {
-			return nil, fmt.Errorf("build time entry update: %w", err)
-		}
-		query = tx.Rebind(query)
-		_, err = tx.ExecContext(ctx, query, args...)
-		if err != nil {
-			return nil, fmt.Errorf("mark time entries billed: %w", err)
-		}
-	}
-
-	if err := tx.Commit(); err != nil {
-		return nil, fmt.Errorf("commit: %w", err)
-	}
-
-	s.audit.Log(ctx, "create", "invoice", &inv.ID, nil, inv)
-	return &inv, nil
-}
-
-func (s *InvoiceService) Update(ctx context.Context, tenantID, invoiceID uuid.UUID, input UpdateInvoiceInput) (*models.Invoice, error) {
-	old, err := s.GetByID(ctx, tenantID, invoiceID)
-	if err != nil {
-		return nil, err
-	}
-	if old == nil {
-		return nil, fmt.Errorf("invoice not found")
-	}
-	if old.Status != "draft" {
-		return nil, fmt.Errorf("can only update draft invoices")
-	}
-
-	// Recalculate totals if items changed
-	var itemsJSON json.RawMessage
-	var subtotal float64
-	taxRate := old.TaxRate
-
-	if input.Items != nil {
-		for _, item := range input.Items {
-			subtotal += item.Amount
-		}
-		itemsJSON, _ = json.Marshal(input.Items)
-	}
-	if input.TaxRate != nil {
-		taxRate = *input.TaxRate
-	}
-
-	if input.Items != nil {
-		taxAmount := subtotal * taxRate / 100
-		total := subtotal + taxAmount
-
-		var inv models.Invoice
-		err = s.db.QueryRowxContext(ctx,
-			`UPDATE invoices SET
-				client_name = COALESCE($3, client_name),
-				client_address = COALESCE($4, client_address),
-				items = $5,
-				subtotal = $6,
-				tax_rate = $7,
-				tax_amount = $8,
-				total = $9,
-				issued_at = COALESCE($10, issued_at),
-				due_at = COALESCE($11, due_at),
-				notes = COALESCE($12, notes),
-				updated_at = now()
-			 WHERE tenant_id = $1 AND id = $2
-			 RETURNING `+invoiceCols,
-			tenantID, invoiceID, input.ClientName, input.ClientAddress,
-			itemsJSON, subtotal, taxRate, subtotal*taxRate/100, total,
-			input.IssuedAt, input.DueAt, input.Notes,
-		).StructScan(&inv)
-		if err != nil {
-			return nil, fmt.Errorf("update invoice: %w", err)
-		}
-		s.audit.Log(ctx, "update", "invoice", &inv.ID, old, inv)
-		return &inv, nil
-	}
-
-	// Update without changing items
-	var inv models.Invoice
-	err = s.db.QueryRowxContext(ctx,
-		`UPDATE invoices SET
-			client_name = COALESCE($3, client_name),
-			client_address = COALESCE($4, client_address),
-			tax_rate = COALESCE($5, tax_rate),
-			issued_at = COALESCE($6, issued_at),
-			due_at = COALESCE($7, due_at),
-			notes = COALESCE($8, notes),
-			updated_at = now()
-		 WHERE tenant_id = $1 AND id = $2
-		 RETURNING `+invoiceCols,
-		tenantID, invoiceID, input.ClientName, input.ClientAddress,
-		input.TaxRate, input.IssuedAt, input.DueAt, input.Notes,
-	).StructScan(&inv)
-	if err != nil {
-		return nil, fmt.Errorf("update invoice: %w", err)
-	}
-
-	s.audit.Log(ctx, "update", "invoice", &inv.ID, old, inv)
-	return &inv, nil
-}
-
-func (s *InvoiceService) UpdateStatus(ctx context.Context, tenantID, invoiceID uuid.UUID, newStatus string) (*models.Invoice, error) {
-	old, err := s.GetByID(ctx, tenantID, invoiceID)
-	if err != nil {
-		return nil, err
-	}
-	if old == nil {
-		return nil, fmt.Errorf("invoice not found")
-	}
-
-	// Validate transitions
-	validTransitions := map[string][]string{
-		"draft":     {"sent", "cancelled"},
-		"sent":      {"paid", "cancelled"},
-		"paid":      {},
-		"cancelled": {},
-	}
-	allowed := validTransitions[old.Status]
-	valid := false
-	for _, s := range allowed {
-		if s == newStatus {
-			valid = true
-			break
-		}
-	}
-	if !valid {
-		return nil, fmt.Errorf("invalid status transition from %s to %s", old.Status, newStatus)
-	}
-
-	var paidAt *time.Time
-	if newStatus == "paid" {
-		now := time.Now()
-		paidAt = &now
-	}
-
-	var inv models.Invoice
-	err = s.db.QueryRowxContext(ctx,
-		`UPDATE invoices SET status = $3, paid_at = COALESCE($4, paid_at), updated_at = now()
-		 WHERE tenant_id = $1 AND id = $2
-		 RETURNING `+invoiceCols,
-		tenantID, invoiceID, newStatus, paidAt,
-	).StructScan(&inv)
-	if err != nil {
-		return nil, fmt.Errorf("update invoice status: %w", err)
-	}
-
-	s.audit.Log(ctx, "update", "invoice", &inv.ID, old, inv)
-	return &inv, nil
-}
--- a/backend/internal/services/time_entry_service.go
+++ b/backend/internal/services/time_entry_service.go
@@ -1,276 +0,0 @@
-package services
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-
-	"github.com/google/uuid"
-	"github.com/jmoiron/sqlx"
-
-	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
-)
-
-type TimeEntryService struct {
-	db    *sqlx.DB
-	audit *AuditService
-}
-
-func NewTimeEntryService(db *sqlx.DB, audit *AuditService) *TimeEntryService {
-	return &TimeEntryService{db: db, audit: audit}
-}
-
-type CreateTimeEntryInput struct {
-	CaseID          uuid.UUID `json:"case_id"`
-	Date            string    `json:"date"`
-	DurationMinutes int       `json:"duration_minutes"`
-	Description     string    `json:"description"`
-	Activity        *string   `json:"activity,omitempty"`
-	Billable        *bool     `json:"billable,omitempty"`
-	HourlyRate      *float64  `json:"hourly_rate,omitempty"`
-}
-
-type UpdateTimeEntryInput struct {
-	Date            *string  `json:"date,omitempty"`
-	DurationMinutes *int     `json:"duration_minutes,omitempty"`
-	Description     *string  `json:"description,omitempty"`
-	Activity        *string  `json:"activity,omitempty"`
-	Billable        *bool    `json:"billable,omitempty"`
-	HourlyRate      *float64 `json:"hourly_rate,omitempty"`
-}
-
-type TimeEntryFilter struct {
-	CaseID *uuid.UUID
-	UserID *uuid.UUID
-	From   string
-	To     string
-	Limit  int
-	Offset int
-}
-
-type TimeEntrySummary struct {
-	GroupKey       string  `db:"group_key" json:"group_key"`
-	TotalMinutes   int     `db:"total_minutes" json:"total_minutes"`
-	BillableMinutes int   `db:"billable_minutes" json:"billable_minutes"`
-	TotalAmount    float64 `db:"total_amount" json:"total_amount"`
-	EntryCount     int     `db:"entry_count" json:"entry_count"`
-}
-
-const timeEntryCols = `id, tenant_id, case_id, user_id, date, duration_minutes, description,
-	activity, billable, billed, invoice_id, hourly_rate, created_at, updated_at`
-
-func (s *TimeEntryService) ListForCase(ctx context.Context, tenantID, caseID uuid.UUID) ([]models.TimeEntry, error) {
-	var entries []models.TimeEntry
-	err := s.db.SelectContext(ctx, &entries,
-		`SELECT `+timeEntryCols+` FROM time_entries
-		 WHERE tenant_id = $1 AND case_id = $2
-		 ORDER BY date DESC, created_at DESC`,
-		tenantID, caseID)
-	if err != nil {
-		return nil, fmt.Errorf("list time entries for case: %w", err)
-	}
-	return entries, nil
-}
-
-func (s *TimeEntryService) List(ctx context.Context, tenantID uuid.UUID, filter TimeEntryFilter) ([]models.TimeEntry, int, error) {
-	if filter.Limit <= 0 {
-		filter.Limit = 20
-	}
-	if filter.Limit > 100 {
-		filter.Limit = 100
-	}
-
-	where := "WHERE tenant_id = $1"
-	args := []any{tenantID}
-	argIdx := 2
-
-	if filter.CaseID != nil {
-		where += fmt.Sprintf(" AND case_id = $%d", argIdx)
-		args = append(args, *filter.CaseID)
-		argIdx++
-	}
-	if filter.UserID != nil {
-		where += fmt.Sprintf(" AND user_id = $%d", argIdx)
-		args = append(args, *filter.UserID)
-		argIdx++
-	}
-	if filter.From != "" {
-		where += fmt.Sprintf(" AND date >= $%d", argIdx)
-		args = append(args, filter.From)
-		argIdx++
-	}
-	if filter.To != "" {
-		where += fmt.Sprintf(" AND date <= $%d", argIdx)
-		args = append(args, filter.To)
-		argIdx++
-	}
-
-	var total int
-	err := s.db.GetContext(ctx, &total,
-		"SELECT COUNT(*) FROM time_entries "+where, args...)
-	if err != nil {
-		return nil, 0, fmt.Errorf("count time entries: %w", err)
-	}
-
-	query := fmt.Sprintf("SELECT %s FROM time_entries %s ORDER BY date DESC, created_at DESC LIMIT $%d OFFSET $%d",
-		timeEntryCols, where, argIdx, argIdx+1)
-	args = append(args, filter.Limit, filter.Offset)
-
-	var entries []models.TimeEntry
-	err = s.db.SelectContext(ctx, &entries, query, args...)
-	if err != nil {
-		return nil, 0, fmt.Errorf("list time entries: %w", err)
-	}
-	return entries, total, nil
-}
-
-func (s *TimeEntryService) GetByID(ctx context.Context, tenantID, entryID uuid.UUID) (*models.TimeEntry, error) {
-	var entry models.TimeEntry
-	err := s.db.GetContext(ctx, &entry,
-		`SELECT `+timeEntryCols+` FROM time_entries WHERE tenant_id = $1 AND id = $2`,
-		tenantID, entryID)
-	if err == sql.ErrNoRows {
-		return nil, nil
-	}
-	if err != nil {
-		return nil, fmt.Errorf("get time entry: %w", err)
-	}
-	return &entry, nil
-}
-
-func (s *TimeEntryService) Create(ctx context.Context, tenantID, userID uuid.UUID, input CreateTimeEntryInput) (*models.TimeEntry, error) {
-	billable := true
-	if input.Billable != nil {
-		billable = *input.Billable
-	}
-
-	// If no hourly rate provided, look up the current billing rate
-	hourlyRate := input.HourlyRate
-	if hourlyRate == nil {
-		var rate float64
-		err := s.db.GetContext(ctx, &rate,
-			`SELECT rate FROM billing_rates
-			 WHERE tenant_id = $1 AND (user_id = $2 OR user_id IS NULL)
-			 AND valid_from <= $3 AND (valid_to IS NULL OR valid_to >= $3)
-			 ORDER BY user_id NULLS LAST LIMIT 1`,
-			tenantID, userID, input.Date)
-		if err == nil {
-			hourlyRate = &rate
-		}
-	}
-
-	var entry models.TimeEntry
-	err := s.db.QueryRowxContext(ctx,
-		`INSERT INTO time_entries (tenant_id, case_id, user_id, date, duration_minutes, description, activity, billable, hourly_rate)
-		 VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
-		 RETURNING `+timeEntryCols,
-		tenantID, input.CaseID, userID, input.Date, input.DurationMinutes, input.Description, input.Activity, billable, hourlyRate,
-	).StructScan(&entry)
-	if err != nil {
-		return nil, fmt.Errorf("create time entry: %w", err)
-	}
-
-	s.audit.Log(ctx, "create", "time_entry", &entry.ID, nil, entry)
-	return &entry, nil
-}
-
-func (s *TimeEntryService) Update(ctx context.Context, tenantID, entryID uuid.UUID, input UpdateTimeEntryInput) (*models.TimeEntry, error) {
-	old, err := s.GetByID(ctx, tenantID, entryID)
-	if err != nil {
-		return nil, err
-	}
-	if old == nil {
-		return nil, fmt.Errorf("time entry not found")
-	}
-	if old.Billed {
-		return nil, fmt.Errorf("cannot update a billed time entry")
-	}
-
-	var entry models.TimeEntry
-	err = s.db.QueryRowxContext(ctx,
-		`UPDATE time_entries SET
-			date = COALESCE($3, date),
-			duration_minutes = COALESCE($4, duration_minutes),
-			description = COALESCE($5, description),
-			activity = COALESCE($6, activity),
-			billable = COALESCE($7, billable),
-			hourly_rate = COALESCE($8, hourly_rate),
-			updated_at = now()
-		 WHERE tenant_id = $1 AND id = $2
-		 RETURNING `+timeEntryCols,
-		tenantID, entryID, input.Date, input.DurationMinutes, input.Description, input.Activity, input.Billable, input.HourlyRate,
-	).StructScan(&entry)
-	if err != nil {
-		return nil, fmt.Errorf("update time entry: %w", err)
-	}
-
-	s.audit.Log(ctx, "update", "time_entry", &entry.ID, old, entry)
-	return &entry, nil
-}
-
-func (s *TimeEntryService) Delete(ctx context.Context, tenantID, entryID uuid.UUID) error {
-	old, err := s.GetByID(ctx, tenantID, entryID)
-	if err != nil {
-		return err
-	}
-	if old == nil {
-		return fmt.Errorf("time entry not found")
-	}
-	if old.Billed {
-		return fmt.Errorf("cannot delete a billed time entry")
-	}
-
-	_, err = s.db.ExecContext(ctx,
-		`DELETE FROM time_entries WHERE tenant_id = $1 AND id = $2`,
-		tenantID, entryID)
-	if err != nil {
-		return fmt.Errorf("delete time entry: %w", err)
-	}
-
-	s.audit.Log(ctx, "delete", "time_entry", &entryID, old, nil)
-	return nil
-}
-
-func (s *TimeEntryService) Summary(ctx context.Context, tenantID uuid.UUID, groupBy string, from, to string) ([]TimeEntrySummary, error) {
-	var groupExpr string
-	switch groupBy {
-	case "user":
-		groupExpr = "user_id::text"
-	case "month":
-		groupExpr = "to_char(date, 'YYYY-MM')"
-	default:
-		groupExpr = "case_id::text"
-	}
-
-	where := "WHERE tenant_id = $1"
-	args := []any{tenantID}
-	argIdx := 2
-
-	if from != "" {
-		where += fmt.Sprintf(" AND date >= $%d", argIdx)
-		args = append(args, from)
-		argIdx++
-	}
-	if to != "" {
-		where += fmt.Sprintf(" AND date <= $%d", argIdx)
-		args = append(args, to)
-		argIdx++
-	}
-
-	query := fmt.Sprintf(`SELECT %s AS group_key,
-		SUM(duration_minutes) AS total_minutes,
-		SUM(CASE WHEN billable THEN duration_minutes ELSE 0 END) AS billable_minutes,
-		SUM(CASE WHEN billable AND hourly_rate IS NOT NULL THEN duration_minutes * hourly_rate / 60.0 ELSE 0 END) AS total_amount,
-		COUNT(*) AS entry_count
-		FROM time_entries %s
-		GROUP BY %s
-		ORDER BY %s`,
-		groupExpr, where, groupExpr, groupExpr)
-
-	var summaries []TimeEntrySummary
-	err := s.db.SelectContext(ctx, &summaries, query, args...)
-	if err != nil {
-		return nil, fmt.Errorf("time entry summary: %w", err)
-	}
-	return summaries, nil
-}
--- a/frontend/src/app/(app)/abrechnung/page.tsx
+++ b/frontend/src/app/(app)/abrechnung/page.tsx
@@ -1,164 +0,0 @@
-"use client";
-
-import { useQuery } from "@tanstack/react-query";
-import { api } from "@/lib/api";
-import type { TimeEntry } from "@/lib/types";
-import { format } from "date-fns";
-import { de } from "date-fns/locale";
-import { Timer, Loader2 } from "lucide-react";
-import { useState } from "react";
-import Link from "next/link";
-import { Breadcrumb } from "@/components/layout/Breadcrumb";
-
-function formatDuration(minutes: number): string {
-  const h = Math.floor(minutes / 60);
-  const m = minutes % 60;
-  if (h === 0) return `${m}min`;
-  if (m === 0) return `${h}h`;
-  return `${h}h ${m}min`;
-}
-
-export default function AbrechnungPage() {
-  const [from, setFrom] = useState(() => {
-    const d = new Date();
-    d.setDate(1);
-    return format(d, "yyyy-MM-dd");
-  });
-  const [to, setTo] = useState(() => format(new Date(), "yyyy-MM-dd"));
-
-  const { data, isLoading } = useQuery({
-    queryKey: ["time-entries", from, to],
-    queryFn: () =>
-      api.get<{ time_entries: TimeEntry[]; total: number }>(
-        `/time-entries?from=${from}&to=${to}&limit=100`,
-      ),
-  });
-
-  const entries = data?.time_entries ?? [];
-  const totalMinutes = entries.reduce((s, e) => s + e.duration_minutes, 0);
-  const billableMinutes = entries
-    .filter((e) => e.billable)
-    .reduce((s, e) => s + e.duration_minutes, 0);
-  const totalAmount = entries
-    .filter((e) => e.billable && e.hourly_rate)
-    .reduce((s, e) => s + (e.duration_minutes / 60) * (e.hourly_rate ?? 0), 0);
-
-  return (
-    <div className="animate-fade-in">
-      <Breadcrumb
-        items={[
-          { label: "Dashboard", href: "/dashboard" },
-          { label: "Abrechnung" },
-        ]}
-      />
-
-      <div className="mt-4 flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
-        <h1 className="text-lg font-semibold text-neutral-900">
-          Zeiterfassung
-        </h1>
-        <Link
-          href="/abrechnung/rechnungen"
-          className="text-sm text-neutral-500 transition-colors hover:text-neutral-700"
-        >
-          Rechnungen ansehen &rarr;
-        </Link>
-      </div>
-
-      {/* Filters */}
-      <div className="mt-4 flex flex-wrap items-center gap-3">
-        <div className="flex items-center gap-2">
-          <label className="text-xs text-neutral-500">Von</label>
-          <input
-            type="date"
-            value={from}
-            onChange={(e) => setFrom(e.target.value)}
-            className="rounded-md border border-neutral-300 px-2 py-1 text-sm focus:border-neutral-500 focus:outline-none"
-          />
-        </div>
-        <div className="flex items-center gap-2">
-          <label className="text-xs text-neutral-500">Bis</label>
-          <input
-            type="date"
-            value={to}
-            onChange={(e) => setTo(e.target.value)}
-            className="rounded-md border border-neutral-300 px-2 py-1 text-sm focus:border-neutral-500 focus:outline-none"
-          />
-        </div>
-      </div>
-
-      {/* Summary cards */}
-      <div className="mt-4 grid grid-cols-1 gap-3 sm:grid-cols-3">
-        <div className="rounded-md border border-neutral-200 bg-white p-4">
-          <p className="text-xs text-neutral-500">Gesamt</p>
-          <p className="mt-1 text-xl font-semibold text-neutral-900">
-            {formatDuration(totalMinutes)}
-          </p>
-        </div>
-        <div className="rounded-md border border-neutral-200 bg-white p-4">
-          <p className="text-xs text-neutral-500">Abrechenbar</p>
-          <p className="mt-1 text-xl font-semibold text-neutral-900">
-            {formatDuration(billableMinutes)}
-          </p>
-        </div>
-        <div className="rounded-md border border-neutral-200 bg-white p-4">
-          <p className="text-xs text-neutral-500">Betrag</p>
-          <p className="mt-1 text-xl font-semibold text-neutral-900">
-            {totalAmount.toFixed(2)} EUR
-          </p>
-        </div>
-      </div>
-
-      {/* Entries */}
-      {isLoading ? (
-        <div className="flex items-center justify-center py-8">
-          <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
-        </div>
-      ) : entries.length === 0 ? (
-        <div className="flex flex-col items-center py-12 text-center">
-          <div className="rounded-xl bg-neutral-100 p-3">
-            <Timer className="h-5 w-5 text-neutral-400" />
-          </div>
-          <p className="mt-2 text-sm text-neutral-500">
-            Keine Zeiteintraege im gewaehlten Zeitraum.
-          </p>
-        </div>
-      ) : (
-        <div className="mt-4 space-y-2">
-          {entries.map((entry) => (
-            <div
-              key={entry.id}
-              className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3"
-            >
-              <div className="min-w-0 flex-1">
-                <p className="text-sm font-medium text-neutral-900 truncate">
-                  {entry.description}
-                </p>
-                <div className="mt-0.5 flex gap-3 text-xs text-neutral-500">
-                  <span>
-                    {format(new Date(entry.date), "d. MMM yyyy", { locale: de })}
-                  </span>
-                  <Link
-                    href={`/cases/${entry.case_id}/zeiterfassung`}
-                    className="hover:text-neutral-700"
-                  >
-                    Akte ansehen
-                  </Link>
-                </div>
-              </div>
-              <div className="flex items-center gap-4 ml-4 text-sm">
-                {entry.billable ? (
-                  <span className="text-emerald-600">abrechenbar</span>
-                ) : (
-                  <span className="text-neutral-400">intern</span>
-                )}
-                <span className="font-medium text-neutral-900 whitespace-nowrap">
-                  {formatDuration(entry.duration_minutes)}
-                </span>
-              </div>
-            </div>
-          ))}
-        </div>
-      )}
-    </div>
-  );
-}
--- a/frontend/src/app/(app)/abrechnung/rechnungen/[id]/page.tsx
+++ b/frontend/src/app/(app)/abrechnung/rechnungen/[id]/page.tsx
@@ -1,225 +0,0 @@
-"use client";
-
-import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
-import { useParams } from "next/navigation";
-import { api } from "@/lib/api";
-import type { Invoice } from "@/lib/types";
-import { format } from "date-fns";
-import { de } from "date-fns/locale";
-import { Loader2, AlertTriangle } from "lucide-react";
-import { Breadcrumb } from "@/components/layout/Breadcrumb";
-
-const STATUS_BADGE: Record<string, string> = {
-  draft: "bg-neutral-100 text-neutral-600",
-  sent: "bg-blue-50 text-blue-700",
-  paid: "bg-emerald-50 text-emerald-700",
-  cancelled: "bg-red-50 text-red-600",
-};
-
-const STATUS_LABEL: Record<string, string> = {
-  draft: "Entwurf",
-  sent: "Versendet",
-  paid: "Bezahlt",
-  cancelled: "Storniert",
-};
-
-const TRANSITIONS: Record<string, { label: string; next: string }[]> = {
-  draft: [
-    { label: "Als versendet markieren", next: "sent" },
-    { label: "Stornieren", next: "cancelled" },
-  ],
-  sent: [
-    { label: "Als bezahlt markieren", next: "paid" },
-    { label: "Stornieren", next: "cancelled" },
-  ],
-  paid: [],
-  cancelled: [],
-};
-
-export default function InvoiceDetailPage() {
-  const { id } = useParams<{ id: string }>();
-  const queryClient = useQueryClient();
-
-  const { data: invoice, isLoading, error } = useQuery({
-    queryKey: ["invoice", id],
-    queryFn: () => api.get<Invoice>(`/invoices/${id}`),
-  });
-
-  const statusMutation = useMutation({
-    mutationFn: (status: string) =>
-      api.patch<Invoice>(`/invoices/${id}/status`, { status }),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ["invoice", id] });
-      queryClient.invalidateQueries({ queryKey: ["invoices"] });
-    },
-  });
-
-  if (isLoading) {
-    return (
-      <div className="flex items-center justify-center py-12">
-        <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
-      </div>
-    );
-  }
-
-  if (error || !invoice) {
-    return (
-      <div className="py-12 text-center">
-        <AlertTriangle className="mx-auto h-6 w-6 text-red-500" />
-        <p className="mt-2 text-sm text-neutral-500">
-          Rechnung nicht gefunden.
-        </p>
-      </div>
-    );
-  }
-
-  const items = Array.isArray(invoice.items) ? invoice.items : [];
-  const actions = TRANSITIONS[invoice.status] ?? [];
-
-  return (
-    <div className="animate-fade-in">
-      <Breadcrumb
-        items={[
-          { label: "Dashboard", href: "/dashboard" },
-          { label: "Abrechnung", href: "/abrechnung" },
-          { label: "Rechnungen", href: "/abrechnung/rechnungen" },
-          { label: invoice.invoice_number },
-        ]}
-      />
-
-      <div className="mt-4 flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
-        <div>
-          <div className="flex items-center gap-3">
-            <h1 className="text-lg font-semibold text-neutral-900">
-              {invoice.invoice_number}
-            </h1>
-            <span
-              className={`rounded-full px-2 py-0.5 text-xs font-medium ${STATUS_BADGE[invoice.status]}`}
-            >
-              {STATUS_LABEL[invoice.status]}
-            </span>
-          </div>
-          <p className="mt-1 text-sm text-neutral-500">
-            {invoice.client_name}
-          </p>
-        </div>
-        <div className="flex gap-2">
-          {actions.map((action) => (
-            <button
-              key={action.next}
-              onClick={() => statusMutation.mutate(action.next)}
-              disabled={statusMutation.isPending}
-              className="rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:opacity-50"
-            >
-              {action.label}
-            </button>
-          ))}
-        </div>
-      </div>
-
-      {/* Invoice details */}
-      <div className="mt-6 rounded-md border border-neutral-200 bg-white">
-        {/* Client info */}
-        <div className="border-b border-neutral-100 p-4">
-          <p className="text-xs text-neutral-500">Empfaenger</p>
-          <p className="mt-1 text-sm font-medium text-neutral-900">
-            {invoice.client_name}
-          </p>
-          {invoice.client_address && (
-            <p className="mt-0.5 text-sm text-neutral-500 whitespace-pre-line">
-              {invoice.client_address}
-            </p>
-          )}
-        </div>
-
-        {/* Dates */}
-        <div className="flex flex-wrap gap-6 border-b border-neutral-100 p-4">
-          {invoice.issued_at && (
-            <div>
-              <p className="text-xs text-neutral-500">Rechnungsdatum</p>
-              <p className="mt-0.5 text-sm text-neutral-900">
-                {format(new Date(invoice.issued_at), "d. MMMM yyyy", { locale: de })}
-              </p>
-            </div>
-          )}
-          {invoice.due_at && (
-            <div>
-              <p className="text-xs text-neutral-500">Faellig am</p>
-              <p className="mt-0.5 text-sm text-neutral-900">
-                {format(new Date(invoice.due_at), "d. MMMM yyyy", { locale: de })}
-              </p>
-            </div>
-          )}
-          {invoice.paid_at && (
-            <div>
-              <p className="text-xs text-neutral-500">Bezahlt am</p>
-              <p className="mt-0.5 text-sm text-neutral-900">
-                {format(new Date(invoice.paid_at), "d. MMMM yyyy", { locale: de })}
-              </p>
-            </div>
-          )}
-        </div>
-
-        {/* Line items */}
-        <div className="p-4">
-          <table className="w-full text-sm">
-            <thead>
-              <tr className="border-b border-neutral-100 text-left text-xs text-neutral-500">
-                <th className="pb-2 font-medium">Beschreibung</th>
-                <th className="pb-2 font-medium text-right">Betrag</th>
-              </tr>
-            </thead>
-            <tbody>
-              {items.map((item, i) => (
-                <tr key={i} className="border-b border-neutral-50">
-                  <td className="py-2 text-neutral-900">
-                    {item.description}
-                    {item.duration_minutes && item.hourly_rate && (
-                      <span className="ml-2 text-xs text-neutral-400">
-                        ({Math.floor(item.duration_minutes / 60)}h{" "}
-                        {item.duration_minutes % 60}min x {item.hourly_rate} EUR/h)
-                      </span>
-                    )}
-                  </td>
-                  <td className="py-2 text-right text-neutral-900">
-                    {item.amount.toFixed(2)} EUR
-                  </td>
-                </tr>
-              ))}
-            </tbody>
-          </table>
-        </div>
-
-        {/* Totals */}
-        <div className="border-t border-neutral-200 p-4">
-          <div className="flex justify-end">
-            <div className="w-48 space-y-1">
-              <div className="flex justify-between text-sm">
-                <span className="text-neutral-500">Netto</span>
-                <span>{invoice.subtotal.toFixed(2)} EUR</span>
-              </div>
-              <div className="flex justify-between text-sm">
-                <span className="text-neutral-500">
-                  USt. {invoice.tax_rate}%
-                </span>
-                <span>{invoice.tax_amount.toFixed(2)} EUR</span>
-              </div>
-              <div className="flex justify-between border-t border-neutral-200 pt-1 text-sm font-semibold">
-                <span>Gesamt</span>
-                <span>{invoice.total.toFixed(2)} EUR</span>
-              </div>
-            </div>
-          </div>
-        </div>
-
-        {/* Notes */}
-        {invoice.notes && (
-          <div className="border-t border-neutral-100 p-4">
-            <p className="text-xs text-neutral-500">Anmerkungen</p>
-            <p className="mt-1 text-sm text-neutral-700">{invoice.notes}</p>
-          </div>
-        )}
-      </div>
-    </div>
-  );
-}
--- a/frontend/src/app/(app)/abrechnung/rechnungen/page.tsx
+++ b/frontend/src/app/(app)/abrechnung/rechnungen/page.tsx
@@ -1,118 +0,0 @@
-"use client";
-
-import { useQuery } from "@tanstack/react-query";
-import { api } from "@/lib/api";
-import type { Invoice } from "@/lib/types";
-import { format } from "date-fns";
-import { de } from "date-fns/locale";
-import { Receipt, Loader2 } from "lucide-react";
-import Link from "next/link";
-import { useState } from "react";
-import { Breadcrumb } from "@/components/layout/Breadcrumb";
-
-const STATUS_BADGE: Record<string, string> = {
-  draft: "bg-neutral-100 text-neutral-600",
-  sent: "bg-blue-50 text-blue-700",
-  paid: "bg-emerald-50 text-emerald-700",
-  cancelled: "bg-red-50 text-red-600",
-};
-
-const STATUS_LABEL: Record<string, string> = {
-  draft: "Entwurf",
-  sent: "Versendet",
-  paid: "Bezahlt",
-  cancelled: "Storniert",
-};
-
-export default function RechnungenPage() {
-  const [statusFilter, setStatusFilter] = useState("");
-
-  const { data, isLoading } = useQuery({
-    queryKey: ["invoices", statusFilter],
-    queryFn: () => {
-      const params = statusFilter ? `?status=${statusFilter}` : "";
-      return api.get<{ invoices: Invoice[] }>(`/invoices${params}`);
-    },
-  });
-
-  const invoices = data?.invoices ?? [];
-
-  return (
-    <div className="animate-fade-in">
-      <Breadcrumb
-        items={[
-          { label: "Dashboard", href: "/dashboard" },
-          { label: "Abrechnung", href: "/abrechnung" },
-          { label: "Rechnungen" },
-        ]}
-      />
-
-      <div className="mt-4 flex items-center justify-between">
-        <h1 className="text-lg font-semibold text-neutral-900">Rechnungen</h1>
-      </div>
-
-      {/* Filters */}
-      <div className="mt-4 flex gap-2">
-        {["", "draft", "sent", "paid", "cancelled"].map((s) => (
-          <button
-            key={s}
-            onClick={() => setStatusFilter(s)}
-            className={`rounded-md px-2.5 py-1 text-xs font-medium transition-colors ${
-              statusFilter === s
-                ? "bg-neutral-900 text-white"
-                : "bg-neutral-100 text-neutral-600 hover:bg-neutral-200"
-            }`}
-          >
-            {s === "" ? "Alle" : STATUS_LABEL[s]}
-          </button>
-        ))}
-      </div>
-
-      {isLoading ? (
-        <div className="flex items-center justify-center py-8">
-          <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
-        </div>
-      ) : invoices.length === 0 ? (
-        <div className="flex flex-col items-center py-12 text-center">
-          <div className="rounded-xl bg-neutral-100 p-3">
-            <Receipt className="h-5 w-5 text-neutral-400" />
-          </div>
-          <p className="mt-2 text-sm text-neutral-500">
-            Keine Rechnungen vorhanden.
-          </p>
-        </div>
-      ) : (
-        <div className="mt-4 space-y-2">
-          {invoices.map((inv) => (
-            <Link
-              key={inv.id}
-              href={`/abrechnung/rechnungen/${inv.id}`}
-              className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3 transition-colors hover:bg-neutral-50"
-            >
-              <div>
-                <div className="flex items-center gap-2">
-                  <p className="text-sm font-medium text-neutral-900">
-                    {inv.invoice_number}
-                  </p>
-                  <span
-                    className={`rounded-full px-2 py-0.5 text-xs font-medium ${STATUS_BADGE[inv.status]}`}
-                  >
-                    {STATUS_LABEL[inv.status]}
-                  </span>
-                </div>
-                <p className="mt-0.5 text-xs text-neutral-500">
-                  {inv.client_name}
-                  {inv.issued_at &&
-                    ` — ${format(new Date(inv.issued_at), "d. MMM yyyy", { locale: de })}`}
-                </p>
-              </div>
-              <p className="text-sm font-semibold text-neutral-900">
-                {inv.total.toFixed(2)} EUR
-              </p>
-            </Link>
-          ))}
-        </div>
-      )}
-    </div>
-  );
-}
--- a/frontend/src/app/(app)/cases/[id]/ki/page.tsx
+++ b/frontend/src/app/(app)/cases/[id]/ki/page.tsx
@@ -0,0 +1,51 @@
+"use client";
+
+import { useState } from "react";
+import { useParams } from "next/navigation";
+import { Brain, FileText, Search } from "lucide-react";
+import { CaseStrategy } from "@/components/ai/CaseStrategy";
+import { DocumentDrafter } from "@/components/ai/DocumentDrafter";
+import { SimilarCaseFinder } from "@/components/ai/SimilarCaseFinder";
+
+type AITab = "strategy" | "draft" | "similar";
+
+const TABS: { id: AITab; label: string; icon: typeof Brain }[] = [
+  { id: "strategy", label: "KI-Strategie", icon: Brain },
+  { id: "draft", label: "KI-Entwurf", icon: FileText },
+  { id: "similar", label: "Aehnliche Faelle", icon: Search },
+];
+
+export default function CaseAIPage() {
+  const { id } = useParams<{ id: string }>();
+  const [activeTab, setActiveTab] = useState<AITab>("strategy");
+
+  return (
+    <div>
+      {/* Sub-tabs */}
+      <div className="mb-6 flex gap-1 rounded-lg border border-neutral-200 bg-neutral-50 p-1">
+        {TABS.map((tab) => {
+          const isActive = activeTab === tab.id;
+          return (
+            <button
+              key={tab.id}
+              onClick={() => setActiveTab(tab.id)}
+              className={`inline-flex flex-1 items-center justify-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium transition-colors ${
+                isActive
+                  ? "bg-white text-neutral-900 shadow-sm"
+                  : "text-neutral-500 hover:text-neutral-700"
+              }`}
+            >
+              <tab.icon className="h-4 w-4" />
+              {tab.label}
+            </button>
+          );
+        })}
+      </div>
+
+      {/* Content */}
+      {activeTab === "strategy" && <CaseStrategy caseId={id} />}
+      {activeTab === "draft" && <DocumentDrafter caseId={id} />}
+      {activeTab === "similar" && <SimilarCaseFinder caseId={id} />}
+    </div>
+  );
+}
--- a/frontend/src/app/(app)/cases/[id]/layout.tsx
+++ b/frontend/src/app/(app)/cases/[id]/layout.tsx
@@ -17,7 +17,7 @@ import {
  StickyNote,
  AlertTriangle,
  ScrollText,
-  Timer,
+  Brain,
 } from "lucide-react";
 import { format } from "date-fns";
 import { de } from "date-fns/locale";
@@ -47,9 +47,9 @@ const TABS = [
  { segment: "dokumente", label: "Dokumente", icon: FileText },
  { segment: "parteien", label: "Parteien", icon: Users },
  { segment: "mitarbeiter", label: "Mitarbeiter", icon: UserCheck },
-  { segment: "zeiterfassung", label: "Zeiterfassung", icon: Timer },
  { segment: "notizen", label: "Notizen", icon: StickyNote },
  { segment: "protokoll", label: "Protokoll", icon: ScrollText },
+  { segment: "ki", label: "KI", icon: Brain },
 ] as const;

 const TAB_LABELS: Record<string, string> = {
@@ -58,9 +58,9 @@ const TAB_LABELS: Record<string, string> = {
  dokumente: "Dokumente",
  parteien: "Parteien",
  mitarbeiter: "Mitarbeiter",
-  zeiterfassung: "Zeiterfassung",
  notizen: "Notizen",
  protokoll: "Protokoll",
+  ki: "KI",
 };

 function CaseDetailSkeleton() {
--- a/frontend/src/app/(app)/cases/[id]/zeiterfassung/page.tsx
+++ b/frontend/src/app/(app)/cases/[id]/zeiterfassung/page.tsx
@@ -1,306 +0,0 @@
-"use client";
-
-import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
-import { useParams } from "next/navigation";
-import { api } from "@/lib/api";
-import type { TimeEntry } from "@/lib/types";
-import { format } from "date-fns";
-import { de } from "date-fns/locale";
-import { Timer, Loader2, Plus, Trash2 } from "lucide-react";
-import { useState } from "react";
-
-function formatDuration(minutes: number): string {
-  const h = Math.floor(minutes / 60);
-  const m = minutes % 60;
-  if (h === 0) return `${m}min`;
-  if (m === 0) return `${h}h`;
-  return `${h}h ${m}min`;
-}
-
-function formatAmount(minutes: number, rate?: number): string {
-  if (!rate) return "-";
-  return `${((minutes / 60) * rate).toFixed(2)} EUR`;
-}
-
-const ACTIVITIES = [
-  { value: "", label: "Keine Kategorie" },
-  { value: "research", label: "Recherche" },
-  { value: "drafting", label: "Entwurf" },
-  { value: "hearing", label: "Verhandlung" },
-  { value: "call", label: "Telefonat" },
-  { value: "review", label: "Prüfung" },
-  { value: "travel", label: "Reise" },
-  { value: "meeting", label: "Besprechung" },
-];
-
-export default function ZeiterfassungPage() {
-  const { id } = useParams<{ id: string }>();
-  const queryClient = useQueryClient();
-  const [showForm, setShowForm] = useState(false);
-  const [desc, setDesc] = useState("");
-  const [hours, setHours] = useState("");
-  const [minutes, setMinutes] = useState("");
-  const [date, setDate] = useState(format(new Date(), "yyyy-MM-dd"));
-  const [activity, setActivity] = useState("");
-  const [billable, setBillable] = useState(true);
-
-  const { data, isLoading } = useQuery({
-    queryKey: ["case-time-entries", id],
-    queryFn: () =>
-      api.get<{ time_entries: TimeEntry[] }>(`/cases/${id}/time-entries`),
-  });
-
-  const createMutation = useMutation({
-    mutationFn: (input: {
-      description: string;
-      duration_minutes: number;
-      date: string;
-      activity?: string;
-      billable: boolean;
-    }) => api.post<TimeEntry>(`/cases/${id}/time-entries`, input),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ["case-time-entries", id] });
-      setShowForm(false);
-      setDesc("");
-      setHours("");
-      setMinutes("");
-      setActivity("");
-      setBillable(true);
-    },
-  });
-
-  const deleteMutation = useMutation({
-    mutationFn: (entryId: string) =>
-      api.delete(`/time-entries/${entryId}`),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ["case-time-entries", id] });
-    },
-  });
-
-  function handleSubmit(e: React.FormEvent) {
-    e.preventDefault();
-    const totalMinutes = (parseInt(hours || "0") * 60) + parseInt(minutes || "0");
-    if (totalMinutes <= 0 || !desc.trim()) return;
-    createMutation.mutate({
-      description: desc.trim(),
-      duration_minutes: totalMinutes,
-      date,
-      activity: activity || undefined,
-      billable,
-    });
-  }
-
-  if (isLoading) {
-    return (
-      <div className="flex items-center justify-center py-8">
-        <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
-      </div>
-    );
-  }
-
-  const entries = data?.time_entries ?? [];
-  const totalMinutes = entries.reduce((s, e) => s + e.duration_minutes, 0);
-  const billableMinutes = entries
-    .filter((e) => e.billable)
-    .reduce((s, e) => s + e.duration_minutes, 0);
-
-  return (
-    <div className="space-y-4">
-      {/* Summary bar */}
-      <div className="flex flex-wrap items-center justify-between gap-3">
-        <div className="flex gap-6 text-sm text-neutral-500">
-          <span>
-            Gesamt: <span className="font-medium text-neutral-900">{formatDuration(totalMinutes)}</span>
-          </span>
-          <span>
-            Abrechenbar: <span className="font-medium text-neutral-900">{formatDuration(billableMinutes)}</span>
-          </span>
-        </div>
-        <button
-          onClick={() => setShowForm(!showForm)}
-          className="inline-flex items-center gap-1.5 rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white transition-colors hover:bg-neutral-800"
-        >
-          <Plus className="h-3.5 w-3.5" />
-          Eintrag
-        </button>
-      </div>
-
-      {/* Quick add form */}
-      {showForm && (
-        <form
-          onSubmit={handleSubmit}
-          className="rounded-md border border-neutral-200 bg-neutral-50 p-4 space-y-3"
-        >
-          <div>
-            <label className="block text-xs font-medium text-neutral-600 mb-1">
-              Beschreibung
-            </label>
-            <input
-              type="text"
-              value={desc}
-              onChange={(e) => setDesc(e.target.value)}
-              placeholder="Was wurde getan?"
-              className="w-full rounded-md border border-neutral-300 px-3 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-              required
-            />
-          </div>
-          <div className="flex flex-wrap gap-3">
-            <div className="flex-1 min-w-[120px]">
-              <label className="block text-xs font-medium text-neutral-600 mb-1">
-                Dauer
-              </label>
-              <div className="flex gap-2">
-                <div className="flex items-center gap-1">
-                  <input
-                    type="number"
-                    min="0"
-                    value={hours}
-                    onChange={(e) => setHours(e.target.value)}
-                    placeholder="0"
-                    className="w-16 rounded-md border border-neutral-300 px-2 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-                  />
-                  <span className="text-xs text-neutral-500">h</span>
-                </div>
-                <div className="flex items-center gap-1">
-                  <input
-                    type="number"
-                    min="0"
-                    max="59"
-                    value={minutes}
-                    onChange={(e) => setMinutes(e.target.value)}
-                    placeholder="0"
-                    className="w-16 rounded-md border border-neutral-300 px-2 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-                  />
-                  <span className="text-xs text-neutral-500">min</span>
-                </div>
-              </div>
-            </div>
-            <div className="flex-1 min-w-[120px]">
-              <label className="block text-xs font-medium text-neutral-600 mb-1">
-                Datum
-              </label>
-              <input
-                type="date"
-                value={date}
-                onChange={(e) => setDate(e.target.value)}
-                className="w-full rounded-md border border-neutral-300 px-3 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-              />
-            </div>
-            <div className="flex-1 min-w-[120px]">
-              <label className="block text-xs font-medium text-neutral-600 mb-1">
-                Kategorie
-              </label>
-              <select
-                value={activity}
-                onChange={(e) => setActivity(e.target.value)}
-                className="w-full rounded-md border border-neutral-300 px-3 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-              >
-                {ACTIVITIES.map((a) => (
-                  <option key={a.value} value={a.value}>
-                    {a.label}
-                  </option>
-                ))}
-              </select>
-            </div>
-          </div>
-          <div className="flex items-center justify-between">
-            <label className="flex items-center gap-2 text-sm text-neutral-600">
-              <input
-                type="checkbox"
-                checked={billable}
-                onChange={(e) => setBillable(e.target.checked)}
-                className="rounded border-neutral-300"
-              />
-              Abrechenbar
-            </label>
-            <div className="flex gap-2">
-              <button
-                type="button"
-                onClick={() => setShowForm(false)}
-                className="rounded-md px-3 py-1.5 text-sm text-neutral-600 transition-colors hover:bg-neutral-100"
-              >
-                Abbrechen
-              </button>
-              <button
-                type="submit"
-                disabled={createMutation.isPending}
-                className="rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:opacity-50"
-              >
-                {createMutation.isPending ? "Speichern..." : "Speichern"}
-              </button>
-            </div>
-          </div>
-          {createMutation.isError && (
-            <p className="text-sm text-red-600">Fehler beim Speichern.</p>
-          )}
-        </form>
-      )}
-
-      {/* Entries list */}
-      {entries.length === 0 ? (
-        <div className="flex flex-col items-center py-8 text-center">
-          <div className="rounded-xl bg-neutral-100 p-3">
-            <Timer className="h-5 w-5 text-neutral-400" />
-          </div>
-          <p className="mt-2 text-sm text-neutral-500">
-            Keine Zeiteintraege vorhanden.
-          </p>
-        </div>
-      ) : (
-        <div className="space-y-2">
-          {entries.map((entry) => (
-            <div
-              key={entry.id}
-              className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3"
-            >
-              <div className="min-w-0 flex-1">
-                <div className="flex items-center gap-2">
-                  <p className="text-sm font-medium text-neutral-900 truncate">
-                    {entry.description}
-                  </p>
-                  {entry.activity && (
-                    <span className="shrink-0 rounded-full bg-neutral-100 px-2 py-0.5 text-xs text-neutral-500">
-                      {ACTIVITIES.find((a) => a.value === entry.activity)?.label ?? entry.activity}
-                    </span>
-                  )}
-                  {!entry.billable && (
-                    <span className="shrink-0 rounded-full bg-neutral-100 px-2 py-0.5 text-xs text-neutral-400">
-                      nicht abrechenbar
-                    </span>
-                  )}
-                  {entry.billed && (
-                    <span className="shrink-0 rounded-full bg-emerald-50 px-2 py-0.5 text-xs text-emerald-700">
-                      abgerechnet
-                    </span>
-                  )}
-                </div>
-                <div className="mt-0.5 flex gap-4 text-xs text-neutral-500">
-                  <span>
-                    {format(new Date(entry.date), "d. MMM yyyy", { locale: de })}
-                  </span>
-                  {entry.hourly_rate && (
-                    <span>{formatAmount(entry.duration_minutes, entry.hourly_rate)}</span>
-                  )}
-                </div>
-              </div>
-              <div className="flex items-center gap-3 ml-4">
-                <span className="text-sm font-medium text-neutral-900 whitespace-nowrap">
-                  {formatDuration(entry.duration_minutes)}
-                </span>
-                {!entry.billed && (
-                  <button
-                    onClick={() => deleteMutation.mutate(entry.id)}
-                    className="rounded-md p-1 text-neutral-400 transition-colors hover:bg-red-50 hover:text-red-600"
-                    title="Loeschen"
-                  >
-                    <Trash2 className="h-3.5 w-3.5" />
-                  </button>
-                )}
-              </div>
-            </div>
-          ))}
-        </div>
-      )}
-    </div>
-  );
-}
--- a/frontend/src/app/(app)/einstellungen/abrechnung/page.tsx
+++ b/frontend/src/app/(app)/einstellungen/abrechnung/page.tsx
@@ -1,166 +0,0 @@
-"use client";
-
-import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
-import { api } from "@/lib/api";
-import type { BillingRate } from "@/lib/types";
-import { format } from "date-fns";
-import { de } from "date-fns/locale";
-import { Loader2, Plus } from "lucide-react";
-import { useState } from "react";
-import { Breadcrumb } from "@/components/layout/Breadcrumb";
-
-export default function BillingRatesPage() {
-  const queryClient = useQueryClient();
-  const [showForm, setShowForm] = useState(false);
-  const [rate, setRate] = useState("");
-  const [validFrom, setValidFrom] = useState(format(new Date(), "yyyy-MM-dd"));
-
-  const { data, isLoading } = useQuery({
-    queryKey: ["billing-rates"],
-    queryFn: () =>
-      api.get<{ billing_rates: BillingRate[] }>("/billing-rates"),
-  });
-
-  const upsertMutation = useMutation({
-    mutationFn: (input: { rate: number; valid_from: string; currency: string }) =>
-      api.put<BillingRate>("/billing-rates", input),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ["billing-rates"] });
-      setShowForm(false);
-      setRate("");
-    },
-  });
-
-  function handleSubmit(e: React.FormEvent) {
-    e.preventDefault();
-    const rateNum = parseFloat(rate);
-    if (isNaN(rateNum) || rateNum < 0) return;
-    upsertMutation.mutate({
-      rate: rateNum,
-      valid_from: validFrom,
-      currency: "EUR",
-    });
-  }
-
-  const rates = data?.billing_rates ?? [];
-
-  return (
-    <div className="animate-fade-in">
-      <Breadcrumb
-        items={[
-          { label: "Dashboard", href: "/dashboard" },
-          { label: "Einstellungen", href: "/einstellungen" },
-          { label: "Stundensaetze" },
-        ]}
-      />
-
-      <div className="mt-4 flex items-center justify-between">
-        <h1 className="text-lg font-semibold text-neutral-900">
-          Stundensaetze
-        </h1>
-        <button
-          onClick={() => setShowForm(!showForm)}
-          className="inline-flex items-center gap-1.5 rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white transition-colors hover:bg-neutral-800"
-        >
-          <Plus className="h-3.5 w-3.5" />
-          Neuer Satz
-        </button>
-      </div>
-
-      {showForm && (
-        <form
-          onSubmit={handleSubmit}
-          className="mt-4 rounded-md border border-neutral-200 bg-neutral-50 p-4 space-y-3"
-        >
-          <div className="flex flex-wrap gap-3">
-            <div className="flex-1 min-w-[150px]">
-              <label className="block text-xs font-medium text-neutral-600 mb-1">
-                Stundensatz (EUR)
-              </label>
-              <input
-                type="number"
-                min="0"
-                step="0.01"
-                value={rate}
-                onChange={(e) => setRate(e.target.value)}
-                placeholder="z.B. 350.00"
-                className="w-full rounded-md border border-neutral-300 px-3 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-                required
-              />
-            </div>
-            <div className="flex-1 min-w-[150px]">
-              <label className="block text-xs font-medium text-neutral-600 mb-1">
-                Gueltig ab
-              </label>
-              <input
-                type="date"
-                value={validFrom}
-                onChange={(e) => setValidFrom(e.target.value)}
-                className="w-full rounded-md border border-neutral-300 px-3 py-1.5 text-sm focus:border-neutral-500 focus:outline-none"
-                required
-              />
-            </div>
-          </div>
-          <div className="flex justify-end gap-2">
-            <button
-              type="button"
-              onClick={() => setShowForm(false)}
-              className="rounded-md px-3 py-1.5 text-sm text-neutral-600 hover:bg-neutral-100"
-            >
-              Abbrechen
-            </button>
-            <button
-              type="submit"
-              disabled={upsertMutation.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"
-            >
-              Speichern
-            </button>
-          </div>
-        </form>
-      )}
-
-      {isLoading ? (
-        <div className="flex items-center justify-center py-8">
-          <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
-        </div>
-      ) : rates.length === 0 ? (
-        <div className="mt-8 text-center">
-          <p className="text-sm text-neutral-500">
-            Noch keine Stundensaetze definiert.
-          </p>
-        </div>
-      ) : (
-        <div className="mt-4 space-y-2">
-          {rates.map((r) => (
-            <div
-              key={r.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">
-                  {r.rate.toFixed(2)} {r.currency}/h
-                </p>
-                <p className="mt-0.5 text-xs text-neutral-500">
-                  {r.user_id ? `Benutzer: ${r.user_id.slice(0, 8)}...` : "Standard (alle Benutzer)"}
-                </p>
-              </div>
-              <div className="text-right text-xs text-neutral-500">
-                <p>
-                  Ab{" "}
-                  {format(new Date(r.valid_from), "d. MMM yyyy", { locale: de })}
-                </p>
-                {r.valid_to && (
-                  <p>
-                    Bis{" "}
-                    {format(new Date(r.valid_to), "d. MMM yyyy", { locale: de })}
-                  </p>
-                )}
-              </div>
-            </div>
-          ))}
-        </div>
-      )}
-    </div>
-  );
-}
--- a/frontend/src/components/ai/CaseStrategy.tsx
+++ b/frontend/src/components/ai/CaseStrategy.tsx
@@ -0,0 +1,226 @@
+"use client";
+
+import { useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { StrategyRecommendation } from "@/lib/types";
+import {
+  Loader2,
+  Brain,
+  AlertTriangle,
+  ArrowRight,
+  Shield,
+  Calendar,
+  RefreshCw,
+} from "lucide-react";
+
+interface CaseStrategyProps {
+  caseId: string;
+}
+
+const PRIORITY_STYLES = {
+  high: "bg-red-50 text-red-700 border-red-200",
+  medium: "bg-amber-50 text-amber-700 border-amber-200",
+  low: "bg-emerald-50 text-emerald-700 border-emerald-200",
+} as const;
+
+const IMPORTANCE_STYLES = {
+  critical: "border-l-red-500",
+  important: "border-l-amber-500",
+  routine: "border-l-neutral-300",
+} as const;
+
+export function CaseStrategy({ caseId }: CaseStrategyProps) {
+  const mutation = useMutation({
+    mutationFn: () =>
+      api.post<StrategyRecommendation>("/ai/case-strategy", {
+        case_id: caseId,
+      }),
+  });
+
+  if (!mutation.data && !mutation.isPending && !mutation.isError) {
+    return (
+      <div className="flex flex-col items-center gap-3 py-8 text-center">
+        <div className="rounded-xl bg-neutral-100 p-3">
+          <Brain className="h-6 w-6 text-neutral-400" />
+        </div>
+        <div>
+          <p className="text-sm font-medium text-neutral-900">
+            KI-Strategieanalyse
+          </p>
+          <p className="mt-1 text-sm text-neutral-500">
+            Claude analysiert die Akte und gibt strategische Empfehlungen.
+          </p>
+        </div>
+        <button
+          onClick={() => mutation.mutate()}
+          className="inline-flex items-center gap-2 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800"
+        >
+          <Brain className="h-4 w-4" />
+          Strategie analysieren
+        </button>
+      </div>
+    );
+  }
+
+  if (mutation.isPending) {
+    return (
+      <div className="flex flex-col items-center gap-3 py-12 text-center">
+        <Loader2 className="h-6 w-6 animate-spin text-neutral-400" />
+        <p className="text-sm text-neutral-500">
+          Claude analysiert die Akte...
+        </p>
+        <p className="text-xs text-neutral-400">
+          Dies kann bis zu 30 Sekunden dauern.
+        </p>
+      </div>
+    );
+  }
+
+  if (mutation.isError) {
+    return (
+      <div className="flex flex-col items-center gap-3 py-8 text-center">
+        <div className="rounded-xl bg-red-50 p-3">
+          <AlertTriangle className="h-6 w-6 text-red-500" />
+        </div>
+        <p className="text-sm text-neutral-900">Analyse fehlgeschlagen</p>
+        <button
+          onClick={() => mutation.mutate()}
+          className="inline-flex items-center gap-1 text-sm text-neutral-500 transition-colors hover:text-neutral-700"
+        >
+          <RefreshCw className="h-3.5 w-3.5" />
+          Erneut versuchen
+        </button>
+      </div>
+    );
+  }
+
+  const data = mutation.data!;
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <h3 className="text-sm font-semibold text-neutral-900">
+          KI-Strategieanalyse
+        </h3>
+        <button
+          onClick={() => mutation.mutate()}
+          className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+        >
+          <RefreshCw className="h-3.5 w-3.5" />
+          Aktualisieren
+        </button>
+      </div>
+
+      {/* Summary */}
+      <div className="rounded-md border border-blue-100 bg-blue-50 px-4 py-3 text-sm text-blue-800">
+        {data.summary}
+      </div>
+
+      {/* Next Steps */}
+      {data.next_steps?.length > 0 && (
+        <div>
+          <h4 className="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-neutral-500">
+            <ArrowRight className="h-3.5 w-3.5" />
+            Naechste Schritte
+          </h4>
+          <div className="space-y-2">
+            {data.next_steps.map((step, i) => (
+              <div
+                key={i}
+                className="rounded-md border border-neutral-200 bg-white px-4 py-3"
+              >
+                <div className="flex items-start gap-3">
+                  <span
+                    className={`mt-0.5 inline-block shrink-0 rounded-full border px-2 py-0.5 text-xs font-medium ${PRIORITY_STYLES[step.priority]}`}
+                  >
+                    {step.priority === "high"
+                      ? "Hoch"
+                      : step.priority === "medium"
+                        ? "Mittel"
+                        : "Niedrig"}
+                  </span>
+                  <div className="min-w-0">
+                    <p className="text-sm font-medium text-neutral-900">
+                      {step.action}
+                    </p>
+                    <p className="mt-1 text-sm text-neutral-500">
+                      {step.reasoning}
+                    </p>
+                    {step.deadline && (
+                      <p className="mt-1 text-xs text-neutral-400">
+                        Frist: {step.deadline}
+                      </p>
+                    )}
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Risk Assessment */}
+      {data.risk_assessment?.length > 0 && (
+        <div>
+          <h4 className="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-neutral-500">
+            <Shield className="h-3.5 w-3.5" />
+            Risikobewertung
+          </h4>
+          <div className="space-y-2">
+            {data.risk_assessment.map((risk, i) => (
+              <div
+                key={i}
+                className="rounded-md border border-neutral-200 bg-white px-4 py-3"
+              >
+                <div className="flex items-start gap-3">
+                  <span
+                    className={`mt-0.5 inline-block shrink-0 rounded-full border px-2 py-0.5 text-xs font-medium ${PRIORITY_STYLES[risk.level]}`}
+                  >
+                    {risk.level === "high"
+                      ? "Hoch"
+                      : risk.level === "medium"
+                        ? "Mittel"
+                        : "Niedrig"}
+                  </span>
+                  <div className="min-w-0">
+                    <p className="text-sm font-medium text-neutral-900">
+                      {risk.risk}
+                    </p>
+                    <p className="mt-1 text-sm text-neutral-500">
+                      Massnahme: {risk.mitigation}
+                    </p>
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Timeline */}
+      {data.timeline?.length > 0 && (
+        <div>
+          <h4 className="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-neutral-500">
+            <Calendar className="h-3.5 w-3.5" />
+            Zeitplan
+          </h4>
+          <div className="space-y-1">
+            {data.timeline.map((item, i) => (
+              <div
+                key={i}
+                className={`border-l-2 py-2 pl-4 ${IMPORTANCE_STYLES[item.importance]}`}
+              >
+                <div className="flex items-baseline gap-2">
+                  <span className="shrink-0 text-xs font-medium text-neutral-400">
+                    {item.date}
+                  </span>
+                  <span className="text-sm text-neutral-900">{item.event}</span>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/ai/DocumentDrafter.tsx
+++ b/frontend/src/components/ai/DocumentDrafter.tsx
@@ -0,0 +1,198 @@
+"use client";
+
+import { useState } from "react";
+import { useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { DocumentDraft, DraftDocumentRequest } from "@/lib/types";
+import { FileText, Loader2, Copy, Check, Download } from "lucide-react";
+
+const TEMPLATES = {
+  klageschrift: "Klageschrift",
+  klageerwiderung: "Klageerwiderung",
+  abmahnung: "Abmahnung",
+  schriftsatz: "Schriftsatz",
+  berufung: "Berufungsschrift",
+  antrag: "Antrag",
+  stellungnahme: "Stellungnahme",
+  gutachten: "Gutachten",
+  vertrag: "Vertrag",
+  vollmacht: "Vollmacht",
+  upc_claim: "UPC Statement of Claim",
+  upc_defence: "UPC Statement of Defence",
+  upc_counterclaim: "UPC Counterclaim for Revocation",
+  upc_injunction: "UPC Provisional Measures",
+} as const;
+
+const LANGUAGES = [
+  { value: "de", label: "Deutsch" },
+  { value: "en", label: "English" },
+  { value: "fr", label: "Francais" },
+] as const;
+
+const inputClass =
+  "w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";
+
+interface DocumentDrafterProps {
+  caseId: string;
+}
+
+export function DocumentDrafter({ caseId }: DocumentDrafterProps) {
+  const [templateType, setTemplateType] = useState("");
+  const [instructions, setInstructions] = useState("");
+  const [language, setLanguage] = useState("de");
+  const [copied, setCopied] = useState(false);
+
+  const mutation = useMutation({
+    mutationFn: (req: DraftDocumentRequest) =>
+      api.post<DocumentDraft>("/ai/draft-document", req),
+  });
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    if (!templateType) return;
+    mutation.mutate({
+      case_id: caseId,
+      template_type: templateType,
+      instructions,
+      language,
+    });
+  }
+
+  function handleCopy() {
+    if (mutation.data?.content) {
+      navigator.clipboard.writeText(mutation.data.content);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    }
+  }
+
+  function handleDownload() {
+    if (!mutation.data?.content) return;
+    const blob = new Blob([mutation.data.content], { type: "text/plain;charset=utf-8" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = `${templateType}_entwurf.txt`;
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+
+  return (
+    <div className="space-y-4">
+      <form onSubmit={handleSubmit} className="space-y-3">
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Dokumenttyp
+          </label>
+          <select
+            value={templateType}
+            onChange={(e) => setTemplateType(e.target.value)}
+            className={inputClass}
+            disabled={mutation.isPending}
+          >
+            <option value="">Dokumenttyp waehlen...</option>
+            {Object.entries(TEMPLATES).map(([key, label]) => (
+              <option key={key} value={key}>
+                {label}
+              </option>
+            ))}
+          </select>
+        </div>
+
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Sprache
+          </label>
+          <select
+            value={language}
+            onChange={(e) => setLanguage(e.target.value)}
+            className={inputClass}
+            disabled={mutation.isPending}
+          >
+            {LANGUAGES.map((lang) => (
+              <option key={lang.value} value={lang.value}>
+                {lang.label}
+              </option>
+            ))}
+          </select>
+        </div>
+
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Anweisungen (optional)
+          </label>
+          <textarea
+            value={instructions}
+            onChange={(e) => setInstructions(e.target.value)}
+            placeholder="z.B. 'Fokus auf Patentanspruch 1, besonders die technischen Merkmale...'"
+            rows={3}
+            className={inputClass}
+            disabled={mutation.isPending}
+          />
+        </div>
+
+        <button
+          type="submit"
+          disabled={!templateType || mutation.isPending}
+          className="inline-flex items-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:opacity-50"
+        >
+          {mutation.isPending ? (
+            <>
+              <Loader2 className="h-4 w-4 animate-spin" />
+              Dokument wird erstellt...
+            </>
+          ) : (
+            <>
+              <FileText className="h-4 w-4" />
+              KI-Entwurf erstellen
+            </>
+          )}
+        </button>
+      </form>
+
+      {mutation.isError && (
+        <div className="rounded-md border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">
+          Fehler beim Erstellen des Entwurfs. Bitte versuchen Sie es erneut.
+        </div>
+      )}
+
+      {mutation.data && (
+        <div className="space-y-3">
+          <div className="flex items-center justify-between">
+            <h4 className="text-sm font-medium text-neutral-900">
+              {mutation.data.title}
+            </h4>
+            <div className="flex items-center gap-2">
+              <button
+                onClick={handleCopy}
+                className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+              >
+                {copied ? (
+                  <>
+                    <Check className="h-3.5 w-3.5 text-emerald-500" />
+                    Kopiert
+                  </>
+                ) : (
+                  <>
+                    <Copy className="h-3.5 w-3.5" />
+                    Kopieren
+                  </>
+                )}
+              </button>
+              <button
+                onClick={handleDownload}
+                className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+              >
+                <Download className="h-3.5 w-3.5" />
+                Download
+              </button>
+            </div>
+          </div>
+          <pre className="max-h-[600px] overflow-auto whitespace-pre-wrap rounded-md border border-neutral-200 bg-neutral-50 p-4 text-sm text-neutral-800">
+            {mutation.data.content}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/ai/SimilarCaseFinder.tsx
+++ b/frontend/src/components/ai/SimilarCaseFinder.tsx
@@ -0,0 +1,183 @@
+"use client";
+
+import { useState } from "react";
+import { useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { SimilarCasesResponse } from "@/lib/types";
+import {
+  Loader2,
+  Search,
+  ExternalLink,
+  AlertTriangle,
+  Scale,
+  RefreshCw,
+} from "lucide-react";
+
+interface SimilarCaseFinderProps {
+  caseId: string;
+}
+
+const inputClass =
+  "w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";
+
+function RelevanceBadge({ score }: { score: number }) {
+  const pct = Math.round(score * 100);
+  let color = "bg-neutral-100 text-neutral-600";
+  if (pct >= 80) color = "bg-emerald-50 text-emerald-700";
+  else if (pct >= 60) color = "bg-blue-50 text-blue-700";
+  else if (pct >= 40) color = "bg-amber-50 text-amber-700";
+  return (
+    <span
+      className={`inline-block shrink-0 rounded-full px-2 py-0.5 text-xs font-medium ${color}`}
+    >
+      {pct}%
+    </span>
+  );
+}
+
+export function SimilarCaseFinder({ caseId }: SimilarCaseFinderProps) {
+  const [description, setDescription] = useState("");
+
+  const mutation = useMutation({
+    mutationFn: (req: { case_id: string; description: string }) =>
+      api.post<SimilarCasesResponse>("/ai/similar-cases", req),
+  });
+
+  function handleSearch(e?: React.FormEvent) {
+    e?.preventDefault();
+    mutation.mutate({ case_id: caseId, description });
+  }
+
+  return (
+    <div className="space-y-4">
+      <form onSubmit={handleSearch} className="space-y-3">
+        <div>
+          <label className="mb-1 block text-xs font-medium text-neutral-500">
+            Zusaetzliche Beschreibung (optional)
+          </label>
+          <textarea
+            value={description}
+            onChange={(e) => setDescription(e.target.value)}
+            placeholder="z.B. 'SEP-Lizenzierung im Mobilfunkbereich, FRAND-Verteidigung...'"
+            rows={2}
+            className={inputClass}
+            disabled={mutation.isPending}
+          />
+        </div>
+
+        <button
+          type="submit"
+          disabled={mutation.isPending}
+          className="inline-flex items-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:opacity-50"
+        >
+          {mutation.isPending ? (
+            <>
+              <Loader2 className="h-4 w-4 animate-spin" />
+              Suche laeuft...
+            </>
+          ) : (
+            <>
+              <Search className="h-4 w-4" />
+              Aehnliche Faelle suchen
+            </>
+          )}
+        </button>
+      </form>
+
+      {mutation.isError && (
+        <div className="flex flex-col items-center gap-3 py-6 text-center">
+          <div className="rounded-xl bg-red-50 p-3">
+            <AlertTriangle className="h-6 w-6 text-red-500" />
+          </div>
+          <p className="text-sm text-neutral-900">Suche fehlgeschlagen</p>
+          <p className="text-xs text-neutral-500">
+            Die youpc.org-Datenbank ist moeglicherweise nicht verfuegbar.
+          </p>
+          <button
+            onClick={() => handleSearch()}
+            className="inline-flex items-center gap-1 text-sm text-neutral-500 transition-colors hover:text-neutral-700"
+          >
+            <RefreshCw className="h-3.5 w-3.5" />
+            Erneut versuchen
+          </button>
+        </div>
+      )}
+
+      {mutation.data && (
+        <div className="space-y-3">
+          <div className="flex items-center justify-between">
+            <p className="text-xs text-neutral-500">
+              {mutation.data.count} aehnliche{" "}
+              {mutation.data.count === 1 ? "Fall" : "Faelle"} gefunden
+            </p>
+            <button
+              onClick={() => handleSearch()}
+              disabled={mutation.isPending}
+              className="inline-flex items-center gap-1 rounded-md border border-neutral-200 px-2.5 py-1.5 text-xs font-medium text-neutral-600 transition-colors hover:bg-neutral-50"
+            >
+              <RefreshCw className="h-3.5 w-3.5" />
+              Aktualisieren
+            </button>
+          </div>
+
+          {mutation.data.cases?.length === 0 && (
+            <div className="flex flex-col items-center gap-2 py-6 text-center">
+              <Scale className="h-6 w-6 text-neutral-300" />
+              <p className="text-sm text-neutral-500">
+                Keine aehnlichen UPC-Faelle gefunden.
+              </p>
+            </div>
+          )}
+
+          {mutation.data.cases?.map((c, i) => (
+            <div
+              key={i}
+              className="rounded-md border border-neutral-200 bg-white px-4 py-3"
+            >
+              <div className="flex items-start justify-between gap-3">
+                <div className="min-w-0 flex-1">
+                  <div className="flex items-center gap-2">
+                    <RelevanceBadge score={c.relevance} />
+                    <span className="text-xs font-medium text-neutral-400">
+                      {c.case_number}
+                    </span>
+                    {c.url && (
+                      <a
+                        href={c.url}
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        className="text-neutral-400 transition-colors hover:text-neutral-600"
+                      >
+                        <ExternalLink className="h-3.5 w-3.5" />
+                      </a>
+                    )}
+                  </div>
+                  <p className="mt-1 text-sm font-medium text-neutral-900">
+                    {c.title}
+                  </p>
+                  <div className="mt-1 flex flex-wrap gap-x-3 text-xs text-neutral-400">
+                    {c.court && <span>{c.court}</span>}
+                    {c.date && <span>{c.date}</span>}
+                  </div>
+                </div>
+              </div>
+
+              <p className="mt-2 text-sm text-neutral-600">{c.explanation}</p>
+
+              {c.key_holdings && (
+                <div className="mt-2 rounded border border-neutral-100 bg-neutral-50 px-3 py-2">
+                  <p className="text-xs font-medium text-neutral-500">
+                    Relevante Entscheidungsgruende
+                  </p>
+                  <p className="mt-0.5 text-xs text-neutral-600">
+                    {c.key_holdings}
+                  </p>
+                </div>
+              )}
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/layout/Sidebar.tsx
+++ b/frontend/src/components/layout/Sidebar.tsx
@@ -11,7 +11,6 @@ import {
  Settings,
  Menu,
  X,
-  Receipt,
 } from "lucide-react";
 import { useState, useEffect } from "react";
 import { usePermissions } from "@/lib/hooks/usePermissions";
@@ -28,7 +27,6 @@ const allNavigation: NavItem[] = [
  { name: "Akten", href: "/cases", icon: FolderOpen },
  { name: "Fristen", href: "/fristen", icon: Clock },
  { name: "Termine", href: "/termine", icon: Calendar },
-  { name: "Abrechnung", href: "/abrechnung", icon: Receipt, permission: "manage_billing" },
  { name: "AI Analyse", href: "/ai/extract", icon: Brain, permission: "ai_extraction" },
  { name: "Einstellungen", href: "/einstellungen", icon: Settings, permission: "manage_settings" },
 ];
--- a/frontend/src/lib/types.ts
+++ b/frontend/src/lib/types.ts
@@ -223,125 +223,6 @@ export const CASE_ASSIGNMENT_ROLE_LABELS: Record<CaseAssignmentRole, string> = {
  viewer: "Einsicht",
 };

-// Time tracking & billing
-
-export interface TimeEntry {
-  id: string;
-  tenant_id: string;
-  case_id: string;
-  user_id: string;
-  date: string;
-  duration_minutes: number;
-  description: string;
-  activity?: string;
-  billable: boolean;
-  billed: boolean;
-  invoice_id?: string;
-  hourly_rate?: number;
-  created_at: string;
-  updated_at: string;
-}
-
-export interface BillingRate {
-  id: string;
-  tenant_id: string;
-  user_id?: string;
-  rate: number;
-  currency: string;
-  valid_from: string;
-  valid_to?: string;
-  created_at: string;
-}
-
-export interface InvoiceItem {
-  description: string;
-  duration_minutes?: number;
-  hourly_rate?: number;
-  amount: number;
-  time_entry_id?: string;
-}
-
-export interface Invoice {
-  id: string;
-  tenant_id: string;
-  case_id: string;
-  invoice_number: string;
-  client_name: string;
-  client_address?: string;
-  items: InvoiceItem[];
-  subtotal: number;
-  tax_rate: number;
-  tax_amount: number;
-  total: number;
-  status: "draft" | "sent" | "paid" | "cancelled";
-  issued_at?: string;
-  due_at?: string;
-  paid_at?: string;
-  notes?: string;
-  created_by: string;
-  created_at: string;
-  updated_at: string;
-}
-
-export interface TimeEntrySummary {
-  group_key: string;
-  total_minutes: number;
-  billable_minutes: number;
-  total_amount: number;
-  entry_count: number;
-}
-
-// Notifications
-export interface Notification {
-  id: string;
-  tenant_id: string;
-  user_id: string;
-  type: string;
-  title: string;
-  body?: string;
-  entity_type?: string;
-  entity_id?: string;
-  sent_at?: string;
-  read_at?: string;
-  created_at: string;
-}
-
-export interface NotificationPreferences {
-  user_id: string;
-  tenant_id: string;
-  deadline_reminder_days: number[];
-  email_enabled: boolean;
-  daily_digest: boolean;
-  created_at: string;
-  updated_at: string;
-}
-
-export interface NotificationListResponse {
-  notifications: Notification[];
-  data: Notification[];
-  total: number;
-}
-
-// Audit log
-export interface AuditLogEntry {
-  id: number;
-  tenant_id: string;
-  user_id?: string;
-  action: string;
-  entity_type: string;
-  entity_id?: string;
-  old_values?: Record<string, unknown>;
-  new_values?: Record<string, unknown>;
-  ip_address?: string;
-  user_agent?: string;
-  created_at: string;
-}
-
-export interface AuditLogResponse {
-  entries: AuditLogEntry[];
-  total: number;
-}
-
 export interface ApiError {
  error: string;
  status: number;
@@ -448,3 +329,81 @@ export interface ExtractionResponse {
  deadlines: ExtractedDeadline[];
  count: number;
 }
+
+// AI Document Drafting
+
+export interface DocumentDraft {
+  title: string;
+  content: string;
+  language: string;
+}
+
+export interface DraftDocumentRequest {
+  case_id: string;
+  template_type: string;
+  instructions: string;
+  language: string;
+}
+
+export const TEMPLATE_TYPES: Record<string, string> = {
+  klageschrift: "Klageschrift",
+  klageerwiderung: "Klageerwiderung",
+  abmahnung: "Abmahnung",
+  schriftsatz: "Schriftsatz",
+  berufung: "Berufungsschrift",
+  antrag: "Antrag",
+  stellungnahme: "Stellungnahme",
+  gutachten: "Gutachten",
+  vertrag: "Vertrag",
+  vollmacht: "Vollmacht",
+  upc_claim: "UPC Statement of Claim",
+  upc_defence: "UPC Statement of Defence",
+  upc_counterclaim: "UPC Counterclaim for Revocation",
+  upc_injunction: "UPC Provisional Measures",
+};
+
+// AI Case Strategy
+
+export interface StrategyStep {
+  priority: "high" | "medium" | "low";
+  action: string;
+  reasoning: string;
+  deadline?: string;
+}
+
+export interface RiskItem {
+  level: "high" | "medium" | "low";
+  risk: string;
+  mitigation: string;
+}
+
+export interface TimelineItem {
+  date: string;
+  event: string;
+  importance: "critical" | "important" | "routine";
+}
+
+export interface StrategyRecommendation {
+  summary: string;
+  next_steps: StrategyStep[];
+  risk_assessment: RiskItem[];
+  timeline: TimelineItem[];
+}
+
+// AI Similar Case Finder
+
+export interface SimilarCase {
+  case_number: string;
+  title: string;
+  court: string;
+  date: string;
+  relevance: number;
+  explanation: string;
+  key_holdings: string;
+  url?: string;
+}
+
+export interface SimilarCasesResponse {
+  cases: SimilarCase[];
+  count: number;
+}