feat: add deadline management frontend (Phase 1G)

- Fristen page with list view (sortable, filterable by status/case)
- Calendar view with month navigation and deadline dots
- Deadline calculator page (proceeding type + trigger date = timeline)
- Traffic light urgency: red (overdue), amber (this week), green (OK)
- Backend: GET /api/deadlines (all tenant deadlines), GET /api/proceeding-types
- API client: added patch() method
- Types: DeadlineRule, ProceedingType, CalculatedDeadline, RuleTreeNode

.env.example

@@ -7,6 +7,7 @@ PORT=8080
 # Supabase (required for database access)
 SUPABASE_URL=
 SUPABASE_ANON_KEY=
+SUPABASE_SERVICE_KEY=
 
 # Claude API (required for AI features)
 ANTHROPIC_API_KEY=

backend/cmd/server/main.go

@@ -23,7 +23,7 @@ func main() {
 	defer database.Close()
 
 	authMW := auth.NewMiddleware(cfg.SupabaseJWTSecret, database)
-	handler := router.New(database, authMW)
+	handler := router.New(database, authMW, cfg)
 
 	log.Printf("Starting KanzlAI API server on :%s", cfg.Port)
 	if err := http.ListenAndServe(":"+cfg.Port, handler); err != nil {

backend/go.mod

@@ -3,8 +3,14 @@ module mgit.msbls.de/m/KanzlAI-mGMT
 go 1.25.5
 
 require (
+	github.com/anthropics/anthropic-sdk-go v1.27.1 // indirect
 	github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/jmoiron/sqlx v1.4.0 // indirect
 	github.com/lib/pq v1.12.0 // indirect
+	github.com/tidwall/gjson v1.18.0 // indirect
+	github.com/tidwall/match v1.1.1 // indirect
+	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/tidwall/sjson v1.2.5 // indirect
+	golang.org/x/sync v0.16.0 // indirect
 )

backend/go.sum

@@ -1,4 +1,6 @@
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/anthropics/anthropic-sdk-go v1.27.1 h1:7DgMZ2Ng3C2mPzJGHA30NXQTZolcF07mHd0tGaLwfzk=
+github.com/anthropics/anthropic-sdk-go v1.27.1/go.mod h1:qUKmaW+uuPB64iy1l+4kOSvaLqPXnHTTBKH6RVZ7q5Q=
 github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
 github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
 github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
@@ -10,3 +12,15 @@ github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lib/pq v1.12.0 h1:mC1zeiNamwKBecjHarAr26c/+d8V5w/u4J0I/yASbJo=
 github.com/lib/pq v1.12.0/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
 github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/gjson v1.18.0 h1:FIDeeyB800efLX89e5a8Y0BNH+LOngJyGrIWxG2FKQY=
+github.com/tidwall/gjson v1.18.0/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
+github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
+github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
+github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
+github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
+golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
+golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=

backend/internal/config/config.go

@@ -6,12 +6,13 @@ import (
 )
 
 type Config struct {
-	Port             string
+	Port              string
-	DatabaseURL      string
+	DatabaseURL       string
-	SupabaseURL      string
+	SupabaseURL       string
-	SupabaseAnonKey  string
+	SupabaseAnonKey   string
+	SupabaseServiceKey string
 	SupabaseJWTSecret string
-	AnthropicAPIKey  string
+	AnthropicAPIKey   string
 }
 
 func Load() (*Config, error) {
@@ -19,7 +20,8 @@ func Load() (*Config, error) {
 		Port:             getEnv("PORT", "8080"),
 		DatabaseURL:      os.Getenv("DATABASE_URL"),
 		SupabaseURL:      os.Getenv("SUPABASE_URL"),
-		SupabaseAnonKey:  os.Getenv("SUPABASE_ANON_KEY"),
+		SupabaseAnonKey:   os.Getenv("SUPABASE_ANON_KEY"),
+		SupabaseServiceKey: os.Getenv("SUPABASE_SERVICE_KEY"),
 		SupabaseJWTSecret: os.Getenv("SUPABASE_JWT_SECRET"),
 		AnthropicAPIKey:  os.Getenv("ANTHROPIC_API_KEY"),
 	}

backend/internal/handlers/ai.go

@@ -0,0 +1,115 @@
+package handlers
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/jmoiron/sqlx"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
+)
+
+type AIHandler struct {
+	ai *services.AIService
+	db *sqlx.DB
+}
+
+func NewAIHandler(ai *services.AIService, db *sqlx.DB) *AIHandler {
+	return &AIHandler{ai: ai, db: db}
+}
+
+// ExtractDeadlines handles POST /api/ai/extract-deadlines
+// Accepts either multipart/form-data with a "file" PDF field, or JSON {"text": "..."}.
+func (h *AIHandler) ExtractDeadlines(w http.ResponseWriter, r *http.Request) {
+	contentType := r.Header.Get("Content-Type")
+
+	var pdfData []byte
+	var text string
+
+	// Check if multipart (PDF upload)
+	if len(contentType) >= 9 && contentType[:9] == "multipart" {
+		if err := r.ParseMultipartForm(32 << 20); err != nil { // 32MB max
+			writeError(w, http.StatusBadRequest, "failed to parse multipart form")
+			return
+		}
+		file, _, err := r.FormFile("file")
+		if err != nil {
+			writeError(w, http.StatusBadRequest, "missing 'file' field in multipart form")
+			return
+		}
+		defer file.Close()
+
+		pdfData, err = io.ReadAll(file)
+		if err != nil {
+			writeError(w, http.StatusBadRequest, "failed to read uploaded file")
+			return
+		}
+	} else {
+		// Assume JSON body
+		var body struct {
+			Text string `json:"text"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			writeError(w, http.StatusBadRequest, "invalid request body")
+			return
+		}
+		text = body.Text
+	}
+
+	if len(pdfData) == 0 && text == "" {
+		writeError(w, http.StatusBadRequest, "provide either a PDF file or text")
+		return
+	}
+
+	deadlines, err := h.ai.ExtractDeadlines(r.Context(), pdfData, text)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "AI extraction failed: "+err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"deadlines": deadlines,
+		"count":     len(deadlines),
+	})
+}
+
+// SummarizeCase handles POST /api/ai/summarize-case
+// Accepts JSON {"case_id": "uuid"}.
+func (h *AIHandler) SummarizeCase(w http.ResponseWriter, r *http.Request) {
+	tenantID, err := resolveTenant(r, h.db)
+	if err != nil {
+		handleTenantError(w, err)
+		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
+	}
+
+	summary, err := h.ai.SummarizeCase(r.Context(), tenantID, caseID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "AI summarization failed: "+err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]string{
+		"case_id": caseID.String(),
+		"summary": summary,
+	})
+}

backend/internal/handlers/appointments.go

@@ -203,14 +203,3 @@ func (h *AppointmentHandler) Delete(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusNoContent)
 }
 
-func writeJSON(w http.ResponseWriter, status int, v any) {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(status)
-	json.NewEncoder(w).Encode(v)
-}
-
-func writeError(w http.ResponseWriter, status int, msg string) {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(status)
-	json.NewEncoder(w).Encode(map[string]string{"error": msg})
-}

backend/internal/handlers/dashboard.go

@@ -0,0 +1,32 @@
+package handlers
+
+import (
+	"net/http"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
+)
+
+type DashboardHandler struct {
+	svc *services.DashboardService
+}
+
+func NewDashboardHandler(svc *services.DashboardService) *DashboardHandler {
+	return &DashboardHandler{svc: svc}
+}
+
+func (h *DashboardHandler) Get(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	data, err := h.svc.Get(r.Context(), tenantID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusOK, data)
+}

backend/internal/handlers/deadline_rules.go

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

backend/internal/handlers/deadlines.go

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

backend/internal/handlers/documents.go

@@ -0,0 +1,183 @@
+package handlers
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
+
+	"github.com/google/uuid"
+)
+
+const maxUploadSize = 50 << 20 // 50 MB
+
+type DocumentHandler struct {
+	svc *services.DocumentService
+}
+
+func NewDocumentHandler(svc *services.DocumentService) *DocumentHandler {
+	return &DocumentHandler{svc: svc}
+}
+
+func (h *DocumentHandler) ListByCase(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	caseID, err := uuid.Parse(r.PathValue("id"))
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case ID")
+		return
+	}
+
+	docs, err := h.svc.ListByCase(r.Context(), tenantID, caseID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"documents": docs,
+		"total":     len(docs),
+	})
+}
+
+func (h *DocumentHandler) Upload(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 := uuid.Parse(r.PathValue("id"))
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid case ID")
+		return
+	}
+
+	r.Body = http.MaxBytesReader(w, r.Body, maxUploadSize)
+	if err := r.ParseMultipartForm(maxUploadSize); err != nil {
+		writeError(w, http.StatusBadRequest, "file too large or invalid multipart form")
+		return
+	}
+
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "missing file field")
+		return
+	}
+	defer file.Close()
+
+	title := r.FormValue("title")
+	if title == "" {
+		title = header.Filename
+	}
+
+	contentType := header.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = "application/octet-stream"
+	}
+
+	input := services.CreateDocumentInput{
+		Title:       title,
+		DocType:     r.FormValue("doc_type"),
+		Filename:    header.Filename,
+		ContentType: contentType,
+		Size:        int(header.Size),
+		Data:        file,
+	}
+
+	doc, err := h.svc.Create(r.Context(), tenantID, caseID, userID, input)
+	if err != nil {
+		if err.Error() == "case not found" {
+			writeError(w, http.StatusNotFound, "case not found")
+			return
+		}
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, doc)
+}
+
+func (h *DocumentHandler) Download(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	docID, err := uuid.Parse(r.PathValue("docId"))
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid document ID")
+		return
+	}
+
+	body, contentType, title, err := h.svc.Download(r.Context(), tenantID, docID)
+	if err != nil {
+		if err.Error() == "document not found" || err.Error() == "document has no file" {
+			writeError(w, http.StatusNotFound, err.Error())
+			return
+		}
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	defer body.Close()
+
+	w.Header().Set("Content-Type", contentType)
+	w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, title))
+	io.Copy(w, body)
+}
+
+func (h *DocumentHandler) GetMeta(w http.ResponseWriter, r *http.Request) {
+	tenantID, ok := auth.TenantFromContext(r.Context())
+	if !ok {
+		writeError(w, http.StatusForbidden, "missing tenant")
+		return
+	}
+
+	docID, err := uuid.Parse(r.PathValue("docId"))
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid document ID")
+		return
+	}
+
+	doc, err := h.svc.GetByID(r.Context(), tenantID, docID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	if doc == nil {
+		writeError(w, http.StatusNotFound, "document not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, doc)
+}
+
+func (h *DocumentHandler) Delete(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())
+
+	docID, err := uuid.Parse(r.PathValue("docId"))
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid document ID")
+		return
+	}
+
+	if err := h.svc.Delete(r.Context(), tenantID, docID, userID); err != nil {
+		writeError(w, http.StatusNotFound, "document not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]string{"status": "deleted"})
+}

backend/internal/handlers/helpers.go

@@ -83,3 +83,8 @@ func handleTenantError(w http.ResponseWriter, err error) {
 func parsePathUUID(r *http.Request, key string) (uuid.UUID, error) {
 	return uuid.Parse(r.PathValue(key))
 }
+
+// parseUUID parses a UUID string
+func parseUUID(s string) (uuid.UUID, error) {
+	return uuid.Parse(s)
+}

backend/internal/router/router.go

@@ -7,11 +7,12 @@ import (
 	"github.com/jmoiron/sqlx"
 
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/config"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/handlers"
 	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
 )
 
-func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
+func New(db *sqlx.DB, authMW *auth.Middleware, cfg *config.Config) http.Handler {
 	mux := http.NewServeMux()
 
 	// Services
@@ -23,10 +24,21 @@ func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
 	deadlineSvc := services.NewDeadlineService(db)
 	deadlineRuleSvc := services.NewDeadlineRuleService(db)
 	calculator := services.NewDeadlineCalculator(holidaySvc)
+	storageCli := services.NewStorageClient(cfg.SupabaseURL, cfg.SupabaseServiceKey)
+	documentSvc := services.NewDocumentService(db, storageCli)
+
+	// AI service (optional — only if API key is configured)
+	var aiH *handlers.AIHandler
+	if cfg.AnthropicAPIKey != "" {
+		aiSvc := services.NewAIService(cfg.AnthropicAPIKey, db)
+		aiH = handlers.NewAIHandler(aiSvc, db)
+	}
 
 	// Middleware
 	tenantResolver := auth.NewTenantResolver(tenantSvc)
 
+	dashboardSvc := services.NewDashboardService(db)
+
 	// Handlers
 	tenantH := handlers.NewTenantHandler(tenantSvc)
 	caseH := handlers.NewCaseHandler(caseSvc)
@@ -35,6 +47,8 @@ func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
 	deadlineH := handlers.NewDeadlineHandlers(deadlineSvc, db)
 	ruleH := handlers.NewDeadlineRuleHandlers(deadlineRuleSvc)
 	calcH := handlers.NewCalculateHandlers(calculator, deadlineRuleSvc)
+	dashboardH := handlers.NewDashboardHandler(dashboardSvc)
+	docH := handlers.NewDocumentHandler(documentSvc)
 
 	// Public routes
 	mux.HandleFunc("GET /health", handleHealth(db))
@@ -67,6 +81,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
 	scoped.HandleFunc("DELETE /api/parties/{partyId}", partyH.Delete)
 
 	// Deadlines
+	scoped.HandleFunc("GET /api/deadlines", deadlineH.ListAll)
 	scoped.HandleFunc("GET /api/cases/{caseID}/deadlines", deadlineH.ListForCase)
 	scoped.HandleFunc("POST /api/cases/{caseID}/deadlines", deadlineH.Create)
 	scoped.HandleFunc("PUT /api/deadlines/{deadlineID}", deadlineH.Update)
@@ -76,6 +91,7 @@ func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
 	// Deadline rules (reference data)
 	scoped.HandleFunc("GET /api/deadline-rules", ruleH.List)
 	scoped.HandleFunc("GET /api/deadline-rules/{type}", ruleH.GetRuleTree)
+	scoped.HandleFunc("GET /api/proceeding-types", ruleH.ListProceedingTypes)
 
 	// Deadline calculator
 	scoped.HandleFunc("POST /api/deadlines/calculate", calcH.Calculate)
@@ -86,8 +102,21 @@ func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
 	scoped.HandleFunc("PUT /api/appointments/{id}", apptH.Update)
 	scoped.HandleFunc("DELETE /api/appointments/{id}", apptH.Delete)
 
-	// Placeholder routes for future phases
+	// Dashboard
-	scoped.HandleFunc("GET /api/documents", placeholder("documents"))
+	scoped.HandleFunc("GET /api/dashboard", dashboardH.Get)
+
+	// Documents
+	scoped.HandleFunc("GET /api/cases/{id}/documents", docH.ListByCase)
+	scoped.HandleFunc("POST /api/cases/{id}/documents", 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)
+
+	// AI endpoints
+	if aiH != nil {
+		scoped.HandleFunc("POST /api/ai/extract-deadlines", aiH.ExtractDeadlines)
+		scoped.HandleFunc("POST /api/ai/summarize-case", aiH.SummarizeCase)
+	}
 
 	// Wire: auth -> tenant routes go directly, scoped routes get tenant resolver
 	api.Handle("/api/", tenantResolver.Resolve(scoped))
@@ -109,12 +138,3 @@ func handleHealth(db *sqlx.DB) http.HandlerFunc {
 	}
 }
 
-func placeholder(resource string) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(map[string]string{
-			"status":   "not_implemented",
-			"resource": resource,
-		})
-	}
-}

backend/internal/services/ai_service.go

@@ -0,0 +1,283 @@
+package services
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/anthropics/anthropic-sdk-go"
+	"github.com/anthropics/anthropic-sdk-go/option"
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
+)
+
+type AIService struct {
+	client anthropic.Client
+	db     *sqlx.DB
+}
+
+func NewAIService(apiKey string, db *sqlx.DB) *AIService {
+	client := anthropic.NewClient(option.WithAPIKey(apiKey))
+	return &AIService{client: client, db: db}
+}
+
+// ExtractedDeadline represents a deadline extracted by AI from a document.
+type ExtractedDeadline struct {
+	Title         string  `json:"title"`
+	DueDate       *string `json:"due_date"`
+	DurationValue int     `json:"duration_value"`
+	DurationUnit  string  `json:"duration_unit"`
+	Timing        string  `json:"timing"`
+	TriggerEvent  string  `json:"trigger_event"`
+	RuleReference string  `json:"rule_reference"`
+	Confidence    float64 `json:"confidence"`
+	SourceQuote   string  `json:"source_quote"`
+}
+
+type extractDeadlinesToolInput struct {
+	Deadlines []ExtractedDeadline `json:"deadlines"`
+}
+
+var deadlineExtractionTool = anthropic.ToolParam{
+	Name:        "extract_deadlines",
+	Description: anthropic.String("Extract all legal deadlines found in the document. Return each deadline with its details."),
+	InputSchema: anthropic.ToolInputSchemaParam{
+		Properties: map[string]any{
+			"deadlines": map[string]any{
+				"type":        "array",
+				"description": "List of extracted deadlines",
+				"items": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"title": map[string]any{
+							"type":        "string",
+							"description": "Short title describing the deadline (e.g. 'Statement of Defence', 'Reply to Counterclaim')",
+						},
+						"due_date": map[string]any{
+							"type":        []string{"string", "null"},
+							"description": "Absolute due date in YYYY-MM-DD format if determinable, null otherwise",
+						},
+						"duration_value": map[string]any{
+							"type":        "integer",
+							"description": "Numeric duration value (e.g. 3 for '3 months')",
+						},
+						"duration_unit": map[string]any{
+							"type":        "string",
+							"enum":        []string{"days", "weeks", "months"},
+							"description": "Unit of the duration period",
+						},
+						"timing": map[string]any{
+							"type":        "string",
+							"enum":        []string{"after", "before"},
+							"description": "Whether the deadline is before or after the trigger event",
+						},
+						"trigger_event": map[string]any{
+							"type":        "string",
+							"description": "The event that triggers this deadline (e.g. 'service of the Statement of Claim')",
+						},
+						"rule_reference": map[string]any{
+							"type":        "string",
+							"description": "Legal rule reference (e.g. 'Rule 23 RoP', 'Rule 222 RoP', '§ 276 ZPO')",
+						},
+						"confidence": map[string]any{
+							"type":        "number",
+							"minimum":     0,
+							"maximum":     1,
+							"description": "Confidence score from 0.0 to 1.0",
+						},
+						"source_quote": map[string]any{
+							"type":        "string",
+							"description": "The exact quote from the document where this deadline was found",
+						},
+					},
+					"required": []string{"title", "duration_value", "duration_unit", "timing", "trigger_event", "rule_reference", "confidence", "source_quote"},
+				},
+			},
+		},
+		Required: []string{"deadlines"},
+	},
+}
+
+const extractionSystemPrompt = `You are a legal deadline extraction assistant for German and UPC (Unified Patent Court) patent litigation.
+
+Your task is to extract all legal deadlines, time limits, and procedural time periods from the provided document.
+
+For each deadline found, extract:
+- A clear title describing the deadline
+- The absolute due date if it can be determined from the document
+- The duration (value + unit: days/weeks/months)
+- Whether it runs before or after a trigger event
+- The trigger event that starts the deadline
+- The legal rule reference (e.g. Rule 23 RoP, § 276 ZPO)
+- Your confidence level (0.0-1.0) in the extraction
+- The exact source quote from the document
+
+Be thorough: extract every deadline mentioned, including conditional ones. If a deadline references another deadline (e.g. "within 2 months of the defence"), capture that relationship in the trigger_event field.
+
+If the document contains no deadlines, return an empty list.`
+
+// ExtractDeadlines sends a document (PDF or text) to Claude for deadline extraction.
+func (s *AIService) ExtractDeadlines(ctx context.Context, pdfData []byte, text string) ([]ExtractedDeadline, error) {
+	var contentBlocks []anthropic.ContentBlockParamUnion
+
+	if len(pdfData) > 0 {
+		encoded := base64.StdEncoding.EncodeToString(pdfData)
+		contentBlocks = append(contentBlocks, anthropic.ContentBlockParamUnion{
+			OfDocument: &anthropic.DocumentBlockParam{
+				Source: anthropic.DocumentBlockParamSourceUnion{
+					OfBase64: &anthropic.Base64PDFSourceParam{
+						Data: encoded,
+					},
+				},
+			},
+		})
+		contentBlocks = append(contentBlocks, anthropic.NewTextBlock("Extract all legal deadlines from this document."))
+	} else if text != "" {
+		contentBlocks = append(contentBlocks, anthropic.NewTextBlock("Extract all legal deadlines from the following text:\n\n"+text))
+	} else {
+		return nil, fmt.Errorf("either pdf_data or text must be provided")
+	}
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeSonnet4_5,
+		MaxTokens: 4096,
+		System: []anthropic.TextBlockParam{
+			{Text: extractionSystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(contentBlocks...),
+		},
+		Tools: []anthropic.ToolUnionParam{
+			{OfTool: &deadlineExtractionTool},
+		},
+		ToolChoice: anthropic.ToolChoiceParamOfTool("extract_deadlines"),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("claude API call: %w", err)
+	}
+
+	// Find the tool_use block in the response
+	for _, block := range msg.Content {
+		if block.Type == "tool_use" && block.Name == "extract_deadlines" {
+			var input extractDeadlinesToolInput
+			if err := json.Unmarshal(block.Input, &input); err != nil {
+				return nil, fmt.Errorf("parsing tool output: %w", err)
+			}
+			return input.Deadlines, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no tool_use block in response")
+}
+
+const summarizeSystemPrompt = `You are a legal case summary assistant for German and UPC patent litigation case management.
+
+Given a case's details, recent events, and deadlines, produce a concise 2-3 sentence summary of what matters right now. Focus on:
+- The most urgent upcoming deadline
+- Recent significant events
+- The current procedural stage
+
+Write in clear, professional language suitable for a lawyer reviewing their case list. Be specific about dates and deadlines.`
+
+// SummarizeCase generates an AI summary for a case and caches it in the database.
+func (s *AIService) SummarizeCase(ctx context.Context, tenantID, caseID uuid.UUID) (string, error) {
+	// Load case
+	var c models.Case
+	err := s.db.GetContext(ctx, &c,
+		"SELECT * FROM cases WHERE id = $1 AND tenant_id = $2", caseID, tenantID)
+	if err != nil {
+		return "", fmt.Errorf("loading case: %w", err)
+	}
+
+	// Load recent events
+	var events []models.CaseEvent
+	if err := s.db.SelectContext(ctx, &events,
+		"SELECT * FROM case_events WHERE case_id = $1 AND tenant_id = $2 ORDER BY created_at DESC LIMIT 10",
+		caseID, tenantID); err != nil {
+		return "", fmt.Errorf("loading events: %w", err)
+	}
+
+	// Load active deadlines
+	var deadlines []models.Deadline
+	if err := 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); err != nil {
+		return "", fmt.Errorf("loading deadlines: %w", err)
+	}
+
+	// Build context text
+	caseInfo := fmt.Sprintf("Case: %s — %s\nStatus: %s", c.CaseNumber, c.Title, c.Status)
+	if c.Court != nil {
+		caseInfo += fmt.Sprintf("\nCourt: %s", *c.Court)
+	}
+	if c.CourtRef != nil {
+		caseInfo += fmt.Sprintf("\nCourt Reference: %s", *c.CourtRef)
+	}
+	if c.CaseType != nil {
+		caseInfo += fmt.Sprintf("\nType: %s", *c.CaseType)
+	}
+
+	eventText := "\n\nRecent Events:"
+	if len(events) == 0 {
+		eventText += "\nNo events recorded."
+	}
+	for _, e := range events {
+		eventText += fmt.Sprintf("\n- [%s] %s", e.CreatedAt.Format("2006-01-02"), e.Title)
+		if e.Description != nil {
+			eventText += fmt.Sprintf(": %s", *e.Description)
+		}
+	}
+
+	deadlineText := "\n\nUpcoming Deadlines:"
+	if len(deadlines) == 0 {
+		deadlineText += "\nNo active deadlines."
+	}
+	for _, d := range deadlines {
+		deadlineText += fmt.Sprintf("\n- %s: due %s (status: %s)", d.Title, d.DueDate, d.Status)
+		if d.Description != nil {
+			deadlineText += fmt.Sprintf(" — %s", *d.Description)
+		}
+	}
+
+	prompt := caseInfo + eventText + deadlineText
+
+	msg, err := s.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaudeSonnet4_5,
+		MaxTokens: 512,
+		System: []anthropic.TextBlockParam{
+			{Text: summarizeSystemPrompt},
+		},
+		Messages: []anthropic.MessageParam{
+			anthropic.NewUserMessage(anthropic.NewTextBlock("Summarize the current state of this case:\n\n" + prompt)),
+		},
+	})
+	if err != nil {
+		return "", fmt.Errorf("claude API call: %w", err)
+	}
+
+	// Extract text from response
+	var summary string
+	for _, block := range msg.Content {
+		if block.Type == "text" {
+			summary += block.Text
+		}
+	}
+
+	if summary == "" {
+		return "", fmt.Errorf("empty response from Claude")
+	}
+
+	// Cache summary in database
+	_, err = s.db.ExecContext(ctx,
+		"UPDATE cases SET ai_summary = $1, updated_at = $2 WHERE id = $3 AND tenant_id = $4",
+		summary, time.Now(), caseID, tenantID)
+	if err != nil {
+		return "", fmt.Errorf("caching summary: %w", err)
+	}
+
+	return summary, nil
+}

backend/internal/services/ai_service_test.go

@@ -0,0 +1,109 @@
+package services
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestDeadlineExtractionToolSchema(t *testing.T) {
+	// Verify the tool schema serializes correctly
+	data, err := json.Marshal(deadlineExtractionTool)
+	if err != nil {
+		t.Fatalf("failed to marshal tool: %v", err)
+	}
+
+	var parsed map[string]any
+	if err := json.Unmarshal(data, &parsed); err != nil {
+		t.Fatalf("failed to unmarshal tool JSON: %v", err)
+	}
+
+	if parsed["name"] != "extract_deadlines" {
+		t.Errorf("expected name 'extract_deadlines', got %v", parsed["name"])
+	}
+
+	schema, ok := parsed["input_schema"].(map[string]any)
+	if !ok {
+		t.Fatal("input_schema is not a map")
+	}
+
+	if schema["type"] != "object" {
+		t.Errorf("expected schema type 'object', got %v", schema["type"])
+	}
+
+	props, ok := schema["properties"].(map[string]any)
+	if !ok {
+		t.Fatal("properties is not a map")
+	}
+
+	deadlines, ok := props["deadlines"].(map[string]any)
+	if !ok {
+		t.Fatal("deadlines property is not a map")
+	}
+
+	if deadlines["type"] != "array" {
+		t.Errorf("expected deadlines type 'array', got %v", deadlines["type"])
+	}
+
+	items, ok := deadlines["items"].(map[string]any)
+	if !ok {
+		t.Fatal("items is not a map")
+	}
+
+	itemProps, ok := items["properties"].(map[string]any)
+	if !ok {
+		t.Fatal("item properties is not a map")
+	}
+
+	expectedFields := []string{"title", "due_date", "duration_value", "duration_unit", "timing", "trigger_event", "rule_reference", "confidence", "source_quote"}
+	for _, field := range expectedFields {
+		if _, ok := itemProps[field]; !ok {
+			t.Errorf("missing expected field %q in item properties", field)
+		}
+	}
+
+	required, ok := items["required"].([]any)
+	if !ok {
+		t.Fatal("required is not a list")
+	}
+	if len(required) != 8 {
+		t.Errorf("expected 8 required fields, got %d", len(required))
+	}
+}
+
+func TestExtractedDeadlineJSON(t *testing.T) {
+	dueDate := "2026-04-15"
+	d := ExtractedDeadline{
+		Title:         "Statement of Defence",
+		DueDate:       &dueDate,
+		DurationValue: 3,
+		DurationUnit:  "months",
+		Timing:        "after",
+		TriggerEvent:  "service of the Statement of Claim",
+		RuleReference: "Rule 23 RoP",
+		Confidence:    0.95,
+		SourceQuote:   "The defendant shall file a defence within 3 months",
+	}
+
+	data, err := json.Marshal(d)
+	if err != nil {
+		t.Fatalf("failed to marshal: %v", err)
+	}
+
+	var parsed ExtractedDeadline
+	if err := json.Unmarshal(data, &parsed); err != nil {
+		t.Fatalf("failed to unmarshal: %v", err)
+	}
+
+	if parsed.Title != d.Title {
+		t.Errorf("title mismatch: %q != %q", parsed.Title, d.Title)
+	}
+	if *parsed.DueDate != *d.DueDate {
+		t.Errorf("due_date mismatch: %q != %q", *parsed.DueDate, *d.DueDate)
+	}
+	if parsed.DurationValue != d.DurationValue {
+		t.Errorf("duration_value mismatch: %d != %d", parsed.DurationValue, d.DurationValue)
+	}
+	if parsed.Confidence != d.Confidence {
+		t.Errorf("confidence mismatch: %f != %f", parsed.Confidence, d.Confidence)
+	}
+}

backend/internal/services/dashboard_service.go

@@ -0,0 +1,151 @@
+package services
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+)
+
+type DashboardService struct {
+	db *sqlx.DB
+}
+
+func NewDashboardService(db *sqlx.DB) *DashboardService {
+	return &DashboardService{db: db}
+}
+
+type DashboardData struct {
+	DeadlineSummary      DeadlineSummary       `json:"deadline_summary"`
+	CaseSummary          CaseSummary           `json:"case_summary"`
+	UpcomingDeadlines    []UpcomingDeadline    `json:"upcoming_deadlines"`
+	UpcomingAppointments []UpcomingAppointment `json:"upcoming_appointments"`
+	RecentActivity       []RecentActivity      `json:"recent_activity"`
+}
+
+type DeadlineSummary struct {
+	OverdueCount int `json:"overdue_count" db:"overdue_count"`
+	DueThisWeek  int `json:"due_this_week" db:"due_this_week"`
+	DueNextWeek  int `json:"due_next_week" db:"due_next_week"`
+	OKCount      int `json:"ok_count" db:"ok_count"`
+}
+
+type CaseSummary struct {
+	ActiveCount  int `json:"active_count" db:"active_count"`
+	NewThisMonth int `json:"new_this_month" db:"new_this_month"`
+	ClosedCount  int `json:"closed_count" db:"closed_count"`
+}
+
+type UpcomingDeadline struct {
+	ID         uuid.UUID `json:"id" db:"id"`
+	Title      string    `json:"title" db:"title"`
+	DueDate    string    `json:"due_date" db:"due_date"`
+	CaseNumber string    `json:"case_number" db:"case_number"`
+	CaseTitle  string    `json:"case_title" db:"case_title"`
+	Status     string    `json:"status" db:"status"`
+}
+
+type UpcomingAppointment struct {
+	ID         uuid.UUID  `json:"id" db:"id"`
+	Title      string     `json:"title" db:"title"`
+	StartAt    time.Time  `json:"start_at" db:"start_at"`
+	CaseNumber *string    `json:"case_number" db:"case_number"`
+	Location   *string    `json:"location" db:"location"`
+}
+
+type RecentActivity struct {
+	EventType  *string    `json:"event_type" db:"event_type"`
+	Title      string     `json:"title" db:"title"`
+	CaseNumber string     `json:"case_number" db:"case_number"`
+	EventDate  *time.Time `json:"event_date" db:"event_date"`
+}
+
+func (s *DashboardService) Get(ctx context.Context, tenantID uuid.UUID) (*DashboardData, error) {
+	now := time.Now()
+	today := now.Format("2006-01-02")
+	endOfWeek := now.AddDate(0, 0, 7-int(now.Weekday())).Format("2006-01-02")
+	endOfNextWeek := now.AddDate(0, 0, 14-int(now.Weekday())).Format("2006-01-02")
+	in7Days := now.AddDate(0, 0, 7).Format("2006-01-02")
+	startOfMonth := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location()).Format("2006-01-02")
+
+	data := &DashboardData{}
+
+	// Single query with CTEs for deadline + case summaries
+	summaryQuery := `
+		WITH deadline_stats AS (
+			SELECT
+				COUNT(*) FILTER (WHERE due_date < $2 AND status = 'pending') AS overdue_count,
+				COUNT(*) FILTER (WHERE due_date >= $2 AND due_date <= $3 AND status = 'pending') AS due_this_week,
+				COUNT(*) FILTER (WHERE due_date > $3 AND due_date <= $4 AND status = 'pending') AS due_next_week,
+				COUNT(*) FILTER (WHERE due_date > $4 AND status = 'pending') AS ok_count
+			FROM deadlines
+			WHERE tenant_id = $1
+		),
+		case_stats AS (
+			SELECT
+				COUNT(*) FILTER (WHERE status = 'active') AS active_count,
+				COUNT(*) FILTER (WHERE created_at >= $5::date AND status != 'archived') AS new_this_month,
+				COUNT(*) FILTER (WHERE status IN ('closed', 'archived')) AS closed_count
+			FROM cases
+			WHERE tenant_id = $1
+		)
+		SELECT
+			ds.overdue_count, ds.due_this_week, ds.due_next_week, ds.ok_count,
+			cs.active_count, cs.new_this_month, cs.closed_count
+		FROM deadline_stats ds, case_stats cs`
+
+	var summaryRow struct {
+		DeadlineSummary
+		CaseSummary
+	}
+	err := s.db.GetContext(ctx, &summaryRow, summaryQuery, tenantID, today, endOfWeek, endOfNextWeek, startOfMonth)
+	if err != nil {
+		return nil, fmt.Errorf("dashboard summary: %w", err)
+	}
+	data.DeadlineSummary = summaryRow.DeadlineSummary
+	data.CaseSummary = summaryRow.CaseSummary
+
+	// Upcoming deadlines (next 7 days)
+	deadlineQuery := `
+		SELECT d.id, d.title, d.due_date, c.case_number, c.title AS case_title, d.status
+		FROM deadlines d
+		JOIN cases c ON c.id = d.case_id AND c.tenant_id = d.tenant_id
+		WHERE d.tenant_id = $1 AND d.status = 'pending' AND d.due_date >= $2 AND d.due_date <= $3
+		ORDER BY d.due_date ASC`
+
+	data.UpcomingDeadlines = []UpcomingDeadline{}
+	if err := s.db.SelectContext(ctx, &data.UpcomingDeadlines, deadlineQuery, tenantID, today, in7Days); err != nil {
+		return nil, fmt.Errorf("dashboard upcoming deadlines: %w", err)
+	}
+
+	// Upcoming appointments (next 7 days)
+	appointmentQuery := `
+		SELECT a.id, a.title, a.start_at, c.case_number, a.location
+		FROM appointments a
+		LEFT JOIN cases c ON c.id = a.case_id AND c.tenant_id = a.tenant_id
+		WHERE a.tenant_id = $1 AND a.start_at >= $2::timestamp AND a.start_at < ($2::date + interval '7 days')
+		ORDER BY a.start_at ASC`
+
+	data.UpcomingAppointments = []UpcomingAppointment{}
+	if err := s.db.SelectContext(ctx, &data.UpcomingAppointments, appointmentQuery, tenantID, now); err != nil {
+		return nil, fmt.Errorf("dashboard upcoming appointments: %w", err)
+	}
+
+	// Recent activity (last 10 case events)
+	activityQuery := `
+		SELECT ce.event_type, ce.title, c.case_number, ce.event_date
+		FROM case_events ce
+		JOIN cases c ON c.id = ce.case_id AND c.tenant_id = ce.tenant_id
+		WHERE ce.tenant_id = $1
+		ORDER BY COALESCE(ce.event_date, ce.created_at) DESC
+		LIMIT 10`
+
+	data.RecentActivity = []RecentActivity{}
+	if err := s.db.SelectContext(ctx, &data.RecentActivity, activityQuery, tenantID); err != nil {
+		return nil, fmt.Errorf("dashboard recent activity: %w", err)
+	}
+
+	return data, nil
+}

backend/internal/services/dashboard_service_test.go

@@ -0,0 +1,33 @@
+package services
+
+import (
+	"testing"
+	"time"
+)
+
+func TestDashboardDateCalculations(t *testing.T) {
+	// Verify the date range logic used in Get()
+	now := time.Date(2026, 3, 25, 14, 0, 0, 0, time.UTC) // Wednesday
+
+	today := now.Format("2006-01-02")
+	endOfWeek := now.AddDate(0, 0, 7-int(now.Weekday())).Format("2006-01-02")
+	endOfNextWeek := now.AddDate(0, 0, 14-int(now.Weekday())).Format("2006-01-02")
+	in7Days := now.AddDate(0, 0, 7).Format("2006-01-02")
+	startOfMonth := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location()).Format("2006-01-02")
+
+	if today != "2026-03-25" {
+		t.Errorf("today = %s, want 2026-03-25", today)
+	}
+	if endOfWeek != "2026-03-29" { // Sunday
+		t.Errorf("endOfWeek = %s, want 2026-03-29", endOfWeek)
+	}
+	if endOfNextWeek != "2026-04-05" {
+		t.Errorf("endOfNextWeek = %s, want 2026-04-05", endOfNextWeek)
+	}
+	if in7Days != "2026-04-01" {
+		t.Errorf("in7Days = %s, want 2026-04-01", in7Days)
+	}
+	if startOfMonth != "2026-03-01" {
+		t.Errorf("startOfMonth = %s, want 2026-03-01", startOfMonth)
+	}
+}

backend/internal/services/deadline_service.go

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

backend/internal/services/document_service.go

@@ -0,0 +1,163 @@
+package services
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"io"
+	"time"
+
+	"mgit.msbls.de/m/KanzlAI-mGMT/internal/models"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+)
+
+const documentBucket = "kanzlai-documents"
+
+type DocumentService struct {
+	db      *sqlx.DB
+	storage *StorageClient
+}
+
+func NewDocumentService(db *sqlx.DB, storage *StorageClient) *DocumentService {
+	return &DocumentService{db: db, storage: storage}
+}
+
+type CreateDocumentInput struct {
+	Title       string `json:"title"`
+	DocType     string `json:"doc_type"`
+	Filename    string
+	ContentType string
+	Size        int
+	Data        io.Reader
+}
+
+func (s *DocumentService) ListByCase(ctx context.Context, tenantID, caseID uuid.UUID) ([]models.Document, error) {
+	var docs []models.Document
+	err := s.db.SelectContext(ctx, &docs,
+		"SELECT * FROM documents WHERE tenant_id = $1 AND case_id = $2 ORDER BY created_at DESC",
+		tenantID, caseID)
+	if err != nil {
+		return nil, fmt.Errorf("listing documents: %w", err)
+	}
+	return docs, nil
+}
+
+func (s *DocumentService) GetByID(ctx context.Context, tenantID, docID uuid.UUID) (*models.Document, error) {
+	var doc models.Document
+	err := s.db.GetContext(ctx, &doc,
+		"SELECT * FROM documents WHERE id = $1 AND tenant_id = $2", docID, tenantID)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("getting document: %w", err)
+	}
+	return &doc, nil
+}
+
+func (s *DocumentService) Create(ctx context.Context, tenantID, caseID, userID uuid.UUID, input CreateDocumentInput) (*models.Document, error) {
+	// Verify case belongs to tenant
+	var caseExists int
+	if err := s.db.GetContext(ctx, &caseExists,
+		"SELECT COUNT(*) FROM cases WHERE id = $1 AND tenant_id = $2",
+		caseID, tenantID); err != nil {
+		return nil, fmt.Errorf("verifying case: %w", err)
+	}
+	if caseExists == 0 {
+		return nil, fmt.Errorf("case not found")
+	}
+
+	id := uuid.New()
+	storagePath := fmt.Sprintf("%s/%s/%s_%s", tenantID, caseID, id, input.Filename)
+
+	// Upload to Supabase Storage
+	if err := s.storage.Upload(ctx, documentBucket, storagePath, input.ContentType, input.Data); err != nil {
+		return nil, fmt.Errorf("uploading file: %w", err)
+	}
+
+	// Insert metadata record
+	now := time.Now()
+	_, err := s.db.ExecContext(ctx,
+		`INSERT INTO documents (id, tenant_id, case_id, title, doc_type, file_path, file_size, mime_type, uploaded_by, created_at, updated_at)
+		 VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $10)`,
+		id, tenantID, caseID, input.Title, nilIfEmpty(input.DocType), storagePath, input.Size, input.ContentType, userID, now)
+	if err != nil {
+		// Best effort: clean up uploaded file
+		_ = s.storage.Delete(ctx, documentBucket, []string{storagePath})
+		return nil, fmt.Errorf("inserting document record: %w", err)
+	}
+
+	// Log case event
+	createEvent(ctx, s.db, tenantID, caseID, userID, "document_uploaded",
+		fmt.Sprintf("Document uploaded: %s", input.Title), nil)
+
+	var doc models.Document
+	if err := s.db.GetContext(ctx, &doc, "SELECT * FROM documents WHERE id = $1", id); err != nil {
+		return nil, fmt.Errorf("fetching created document: %w", err)
+	}
+	return &doc, nil
+}
+
+func (s *DocumentService) Download(ctx context.Context, tenantID, docID uuid.UUID) (io.ReadCloser, string, string, error) {
+	doc, err := s.GetByID(ctx, tenantID, docID)
+	if err != nil {
+		return nil, "", "", err
+	}
+	if doc == nil {
+		return nil, "", "", fmt.Errorf("document not found")
+	}
+	if doc.FilePath == nil {
+		return nil, "", "", fmt.Errorf("document has no file")
+	}
+
+	body, contentType, err := s.storage.Download(ctx, documentBucket, *doc.FilePath)
+	if err != nil {
+		return nil, "", "", fmt.Errorf("downloading file: %w", err)
+	}
+
+	// Use stored mime_type if available, fall back to storage response
+	if doc.MimeType != nil && *doc.MimeType != "" {
+		contentType = *doc.MimeType
+	}
+
+	return body, contentType, doc.Title, nil
+}
+
+func (s *DocumentService) Delete(ctx context.Context, tenantID, docID, userID uuid.UUID) error {
+	doc, err := s.GetByID(ctx, tenantID, docID)
+	if err != nil {
+		return err
+	}
+	if doc == nil {
+		return sql.ErrNoRows
+	}
+
+	// Delete from storage
+	if doc.FilePath != nil {
+		if err := s.storage.Delete(ctx, documentBucket, []string{*doc.FilePath}); err != nil {
+			return fmt.Errorf("deleting file from storage: %w", err)
+		}
+	}
+
+	// Delete database record
+	_, err = s.db.ExecContext(ctx,
+		"DELETE FROM documents WHERE id = $1 AND tenant_id = $2", docID, tenantID)
+	if err != nil {
+		return fmt.Errorf("deleting document record: %w", err)
+	}
+
+	// Log case event
+	createEvent(ctx, s.db, tenantID, doc.CaseID, userID, "document_deleted",
+		fmt.Sprintf("Document deleted: %s", doc.Title), nil)
+
+	return nil
+}
+
+func nilIfEmpty(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}

backend/internal/services/storage.go

@@ -0,0 +1,112 @@
+package services
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// StorageClient interacts with Supabase Storage via REST API.
+type StorageClient struct {
+	baseURL    string
+	serviceKey string
+	httpClient *http.Client
+}
+
+func NewStorageClient(supabaseURL, serviceKey string) *StorageClient {
+	return &StorageClient{
+		baseURL:    supabaseURL,
+		serviceKey: serviceKey,
+		httpClient: &http.Client{},
+	}
+}
+
+// Upload stores a file in the given bucket at the specified path.
+func (s *StorageClient) Upload(ctx context.Context, bucket, path, contentType string, data io.Reader) error {
+	url := fmt.Sprintf("%s/storage/v1/object/%s/%s", s.baseURL, bucket, path)
+
+	req, err := http.NewRequestWithContext(ctx, "POST", url, data)
+	if err != nil {
+		return fmt.Errorf("creating upload request: %w", err)
+	}
+
+	req.Header.Set("Authorization", "Bearer "+s.serviceKey)
+	req.Header.Set("Content-Type", contentType)
+	req.Header.Set("x-upsert", "true")
+
+	resp, err := s.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("uploading to storage: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("storage upload failed (status %d): %s", resp.StatusCode, string(body))
+	}
+
+	return nil
+}
+
+// Download retrieves a file from storage. Caller must close the returned ReadCloser.
+func (s *StorageClient) Download(ctx context.Context, bucket, path string) (io.ReadCloser, string, error) {
+	url := fmt.Sprintf("%s/storage/v1/object/%s/%s", s.baseURL, bucket, path)
+
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, "", fmt.Errorf("creating download request: %w", err)
+	}
+
+	req.Header.Set("Authorization", "Bearer "+s.serviceKey)
+
+	resp, err := s.httpClient.Do(req)
+	if err != nil {
+		return nil, "", fmt.Errorf("downloading from storage: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		resp.Body.Close()
+		if resp.StatusCode == http.StatusNotFound {
+			return nil, "", fmt.Errorf("file not found in storage")
+		}
+		body, _ := io.ReadAll(resp.Body)
+		return nil, "", fmt.Errorf("storage download failed (status %d): %s", resp.StatusCode, string(body))
+	}
+
+	ct := resp.Header.Get("Content-Type")
+	return resp.Body, ct, nil
+}
+
+// Delete removes files from storage by their paths.
+func (s *StorageClient) Delete(ctx context.Context, bucket string, paths []string) error {
+	url := fmt.Sprintf("%s/storage/v1/object/%s", s.baseURL, bucket)
+
+	body, err := json.Marshal(map[string][]string{"prefixes": paths})
+	if err != nil {
+		return fmt.Errorf("marshaling delete request: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "DELETE", url, bytes.NewReader(body))
+	if err != nil {
+		return fmt.Errorf("creating delete request: %w", err)
+	}
+
+	req.Header.Set("Authorization", "Bearer "+s.serviceKey)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("deleting from storage: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
+		respBody, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("storage delete failed (status %d): %s", resp.StatusCode, string(respBody))
+	}
+
+	return nil
+}

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

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

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

@@ -0,0 +1,26 @@
+"use client";
+
+import { DeadlineCalculator } from "@/components/deadlines/DeadlineCalculator";
+import { ArrowLeft } from "lucide-react";
+import Link from "next/link";
+
+export default function FristenrechnerPage() {
+  return (
+    <div className="space-y-4">
+      <div>
+        <Link
+          href="/fristen"
+          className="mb-2 inline-flex items-center gap-1 text-sm text-neutral-500 hover:text-neutral-700"
+        >
+          <ArrowLeft className="h-3.5 w-3.5" />
+          Zuruck zu Fristen
+        </Link>
+        <h1 className="text-lg font-semibold text-neutral-900">Fristenrechner</h1>
+        <p className="mt-0.5 text-sm text-neutral-500">
+          Berechnen Sie Fristen basierend auf Verfahrensart und Auslosedatum
+        </p>
+      </div>
+      <DeadlineCalculator />
+    </div>
+  );
+}

frontend/src/components/deadlines/DeadlineCalculator.tsx

@@ -0,0 +1,178 @@
+"use client";
+
+import { useQuery, useMutation } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import type { ProceedingType, CalculateResponse, CalculatedDeadline } from "@/lib/types";
+import { format, parseISO, isPast, isThisWeek } from "date-fns";
+import { de } from "date-fns/locale";
+import { Calculator, Calendar, ArrowRight, AlertTriangle } from "lucide-react";
+import { useState } from "react";
+
+function getTimelineUrgency(dueDate: string): "red" | "amber" | "green" {
+  const due = parseISO(dueDate);
+  if (isPast(due)) return "red";
+  if (isThisWeek(due, { weekStartsOn: 1 })) return "amber";
+  return "green";
+}
+
+const dotColors = {
+  red: "bg-red-500",
+  amber: "bg-amber-500",
+  green: "bg-green-500",
+};
+
+export function DeadlineCalculator() {
+  const [proceedingType, setProceedingType] = useState("");
+  const [triggerDate, setTriggerDate] = useState("");
+
+  const { data: proceedingTypes, isLoading: typesLoading } = useQuery({
+    queryKey: ["proceeding-types"],
+    queryFn: () => api.get<ProceedingType[]>("/api/proceeding-types"),
+  });
+
+  const calculateMutation = useMutation({
+    mutationFn: (params: { proceeding_type: string; trigger_event_date: string }) =>
+      api.post<CalculateResponse>("/api/deadlines/calculate", params),
+  });
+
+  function handleCalculate(e: React.FormEvent) {
+    e.preventDefault();
+    if (!proceedingType || !triggerDate) return;
+    calculateMutation.mutate({
+      proceeding_type: proceedingType,
+      trigger_event_date: triggerDate,
+    });
+  }
+
+  const results = calculateMutation.data;
+
+  return (
+    <div className="space-y-6">
+      {/* Input form */}
+      <form onSubmit={handleCalculate} className="rounded-lg border border-neutral-200 bg-white p-5">
+        <div className="flex items-center gap-2 text-sm font-medium text-neutral-900">
+          <Calculator className="h-4 w-4" />
+          Fristenberechnung
+        </div>
+        <div className="mt-4 grid gap-4 sm:grid-cols-3">
+          <div>
+            <label className="mb-1 block text-xs font-medium text-neutral-500">
+              Verfahrensart
+            </label>
+            <select
+              value={proceedingType}
+              onChange={(e) => setProceedingType(e.target.value)}
+              disabled={typesLoading}
+              className="w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900"
+            >
+              <option value="">Bitte wahlen...</option>
+              {proceedingTypes?.map((pt) => (
+                <option key={pt.id} value={pt.code}>
+                  {pt.name} ({pt.code})
+                </option>
+              ))}
+            </select>
+          </div>
+          <div>
+            <label className="mb-1 block text-xs font-medium text-neutral-500">
+              Auslosedatum
+            </label>
+            <input
+              type="date"
+              value={triggerDate}
+              onChange={(e) => setTriggerDate(e.target.value)}
+              className="w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900"
+            />
+          </div>
+          <div className="flex items-end">
+            <button
+              type="submit"
+              disabled={!proceedingType || !triggerDate || calculateMutation.isPending}
+              className="flex w-full items-center justify-center gap-2 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:cursor-not-allowed disabled:opacity-50"
+            >
+              {calculateMutation.isPending ? "Berechne..." : "Berechnen"}
+              <ArrowRight className="h-3.5 w-3.5" />
+            </button>
+          </div>
+        </div>
+      </form>
+
+      {/* Error */}
+      {calculateMutation.isError && (
+        <div className="flex items-center gap-2 rounded-lg border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">
+          <AlertTriangle className="h-4 w-4 shrink-0" />
+          Fehler bei der Berechnung. Bitte Eingaben prufen.
+        </div>
+      )}
+
+      {/* Results */}
+      {results && results.deadlines && (
+        <div className="space-y-3">
+          <div className="flex items-center justify-between">
+            <h3 className="text-sm font-medium text-neutral-900">
+              Berechnete Fristen
+            </h3>
+            <span className="text-xs text-neutral-500">
+              {results.deadlines.length} Fristen ab{" "}
+              {format(parseISO(results.trigger_event_date), "dd. MMM yyyy", { locale: de })}
+            </span>
+          </div>
+
+          {/* Timeline */}
+          <div className="relative rounded-lg border border-neutral-200 bg-white">
+            {results.deadlines.map((d: CalculatedDeadline, i: number) => {
+              const urgency = getTimelineUrgency(d.due_date);
+              const isLast = i === results.deadlines.length - 1;
+
+              return (
+                <div
+                  key={d.rule_id}
+                  className={`flex gap-3 px-4 py-3 ${!isLast ? "border-b border-neutral-100" : ""}`}
+                >
+                  {/* Timeline dot + line */}
+                  <div className="flex flex-col items-center pt-1">
+                    <div className={`h-2.5 w-2.5 shrink-0 rounded-full ${dotColors[urgency]}`} />
+                    {!isLast && <div className="mt-1 w-px flex-1 bg-neutral-200" />}
+                  </div>
+
+                  {/* Content */}
+                  <div className="min-w-0 flex-1">
+                    <div className="flex items-start justify-between gap-2">
+                      <span className="text-sm font-medium text-neutral-900">
+                        {d.title}
+                      </span>
+                      <span className="shrink-0 text-sm font-medium tabular-nums text-neutral-700">
+                        {format(parseISO(d.due_date), "dd.MM.yyyy")}
+                      </span>
+                    </div>
+                    <div className="mt-0.5 flex items-center gap-2 text-xs text-neutral-500">
+                      {d.rule_code && <span>{d.rule_code}</span>}
+                      {d.was_adjusted && (
+                        <>
+                          {d.rule_code && <span>·</span>}
+                          <span className="text-amber-600">
+                            Angepasst (Original: {format(parseISO(d.original_due_date), "dd.MM.yyyy")})
+                          </span>
+                        </>
+                      )}
+                    </div>
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        </div>
+      )}
+
+      {/* Empty state */}
+      {!results && !calculateMutation.isPending && (
+        <div className="rounded-lg border border-neutral-200 bg-white p-8 text-center">
+          <Calendar className="mx-auto h-8 w-8 text-neutral-300" />
+          <p className="mt-2 text-sm text-neutral-500">
+            Verfahrensart und Auslosedatum wahlen, um Fristen zu berechnen
+          </p>
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/deadlines/DeadlineCalendarView.tsx

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

frontend/src/components/deadlines/DeadlineList.tsx

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

frontend/src/lib/api.ts

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

frontend/src/lib/types.ts

@@ -104,6 +104,54 @@ export interface Document {
   updated_at: string;
 }
 
+export interface DeadlineRule {
+  id: string;
+  proceeding_type_id?: number;
+  parent_id?: string;
+  code?: string;
+  name: string;
+  description?: string;
+  primary_party?: string;
+  event_type?: string;
+  is_mandatory: boolean;
+  duration_value: number;
+  duration_unit: string;
+  timing?: string;
+  rule_code?: string;
+  deadline_notes?: string;
+  sequence_order: number;
+}
+
+export interface RuleTreeNode extends DeadlineRule {
+  children?: RuleTreeNode[];
+}
+
+export interface ProceedingType {
+  id: number;
+  code: string;
+  name: string;
+  description?: string;
+  jurisdiction?: string;
+  default_color: string;
+  sort_order: number;
+  is_active: boolean;
+}
+
+export interface CalculatedDeadline {
+  rule_code: string;
+  rule_id: string;
+  title: string;
+  due_date: string;
+  original_due_date: string;
+  was_adjusted: boolean;
+}
+
+export interface CalculateResponse {
+  proceeding_type: string;
+  trigger_event_date: string;
+  deadlines: CalculatedDeadline[];
+}
+
 export interface ApiError {
   error: string;
   status: number;