Add AI review workflow for Paperless documents

2026-05-07 20:04:30 +02:00
parent 210b77876d
commit f913bc0ba6
24 changed files with 2169 additions and 15 deletions
--- a/.env.portainer.example
+++ b/.env.portainer.example
@@ -42,3 +42,17 @@ WATCHTOWER_ENABLE=false

 # Optional fixed iCal token.
 # ICAL_SECRET=replace-with-long-random-token
+
+# Optional AI document analysis.
+# AI_ENABLED=false
+# AI_PROVIDER=openai
+# AI_BASE_URL=https://api.openai.com/v1
+# AI_MODEL=gpt-4o-mini
+# AI_API_KEY=replace-with-ai-api-key
+# AI_SYSTEM_PROMPT=
+# AI_TIMEOUT_SECONDS=60
+# AI_MAX_TOKENS=2000
+
+# Optional paperless workflow webhook secret.
+# Paperless should send this value as x-contract-companion-secret.
+# PAPERLESS_WEBHOOK_SECRET=replace-with-long-random-webhook-secret
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Begleitdienst zur Verwaltung von Vertragsmetadaten (Laufzeiten, Kündigungsfrist
 - ✅ **Kategorie-Verwaltung:** Dropdown mit Vorschlägen, Inline-Neuanlage im Formular & Verwaltung unter Einstellungen.
 - ✅ **Modernes React-Frontend** (Vite + MUI) mit Dashboard, Vertragsliste, Kalender, Detailansicht und umfangreichen Einstellungen.
 - ✅ **Benachrichtigungen & Automatisierung:** Scheduler prüft Deadlines, optionaler Mailversand, ntfy-Push, iCal-Feed zum Abonnieren.
+- ✅ **AI-gestützte Dokumentprüfung:** Paperless-Webhooks können neue Dokumente zur Analyse einreihen; Verträge werden nach manueller Freigabe angelegt und nach Paperless zurückgeschrieben.
 - ✅ **Konfigurierbare Authentifizierung:** Optionales Login mit JWT, Benutzername/Passwort verwaltbar in den Settings.
 - ✅ **Mehrsprachigkeit:** UI derzeit auf Deutsch und Englisch lokalisiert.
 - ✅ **Docker-ready:** Backend und Frontend als Container, Konfiguration via `docker-compose.yml`.
@@ -99,6 +100,12 @@ Für Portainer-Deployments ist `docker-compose.yml` als Git-basierter Stack vorb
 | `MAIL_SERVER` / `MAIL_PORT` / `MAIL_USERNAME` / `MAIL_PASSWORD` | *(leer)* | SMTP-Settings (TLS optional über `MAIL_USE_TLS`). |
 | `MAIL_FROM` / `MAIL_TO` | *(leer)* | Absender/Empfänger für Mail-Benachrichtigungen. |
 | `ICAL_SECRET` | *(leer)* | Optional vorgegebenes Token für den iCal-Feed. |
+| `AI_ENABLED` | `false` | Aktiviert AI-Analyse, wenn Provider, Modell und API-Key gesetzt sind. |
+| `AI_PROVIDER` | *(leer)* | `openai`, `openai-compatible` oder `gemini`. |
+| `AI_BASE_URL` | *(Provider-Standard)* | Optionaler Endpoint für OpenAI-kompatible Anbieter oder eigene Gateways. |
+| `AI_MODEL` | *(leer)* | Modellname für die Vertragsanalyse. |
+| `AI_API_KEY` | *(leer)* | API-Key des AI-Anbieters. |
+| `PAPERLESS_WEBHOOK_SECRET` | *(leer)* | Shared Secret für Paperless-Webhooks an `/api/integrations/paperless/webhook`. |

 ### Paperless optional nutzen

@@ -124,6 +131,9 @@ Die Sprache der automatisch verschickten Benachrichtigungen (Mail, ntfy) kannst
 - `POST /categories` – Neue Kategorie (legt an oder liefert vorhandene).
 - `DELETE /categories/:id` – Kategorie entfernen.
 - `GET /integrations/paperless/search?q=` – Paperless-Dokumente per Text oder ID finden.
+- `POST /integrations/paperless/webhook` – Neues Paperless-Dokument zur AI-Prüfung einreihen.
+- `GET /ai/reviews` – AI-Prüfwarteschlange abrufen.
+- `POST /ai/reviews/:id/approve` – Vertragsentwurf freigeben, Vertrag anlegen und Paperless aktualisieren.
 - `GET /reports/upcoming?days=` – Deadlines innerhalb der nächsten `days` Tage.
 - `GET /calendar/feed.ics?token=` – iCal-Feed für Kündigungsfristen.

--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -32,6 +32,15 @@ services:
      - MAIL_FROM
      - MAIL_TO
      - ICAL_SECRET
+      - AI_ENABLED
+      - AI_PROVIDER
+      - AI_BASE_URL
+      - AI_MODEL
+      - AI_API_KEY
+      - AI_SYSTEM_PROMPT
+      - AI_TIMEOUT_SECONDS
+      - AI_MAX_TOKENS
+      - PAPERLESS_WEBHOOK_SECRET
    volumes:
      - contracts-data:/app/data
    ports:
--- a/docs/portainer-stack.md
+++ b/docs/portainer-stack.md
@@ -34,9 +34,25 @@ Set these values in Portainer before deploying:
 | `PAPERLESS_EXTERNAL_URL` | unset | Public paperless-ngx URL for browser links. |
 | `PAPERLESS_TOKEN` | unset | paperless-ngx API token. |
 | `WATCHTOWER_ENABLE` | `false` | Enables Watchtower updates when set to `true`. |
+| `AI_ENABLED` | `false` | Enables AI document analysis when provider settings are complete. |
+| `AI_PROVIDER` | unset | `openai`, `openai-compatible`, or `gemini`. |
+| `AI_BASE_URL` | provider default | Optional endpoint for OpenAI-compatible providers or custom gateways. |
+| `AI_MODEL` | unset | Model name used for extraction. |
+| `AI_API_KEY` | unset | API key for the selected AI provider. |
+| `PAPERLESS_WEBHOOK_SECRET` | unset | Shared secret Paperless sends to `/api/integrations/paperless/webhook`. |

 Leave optional variables unset when they are not used. The backend treats blank optional variables as absent, which keeps Portainer edits from breaking URL validation.

+## Paperless Webhook
+
+Create a Paperless workflow for newly consumed documents and add an HTTP webhook action pointing to:
+
+```text
+https://your-contract-app.example.com/api/integrations/paperless/webhook
+```
+
+Send the document id in the JSON body as `document_id` and include the shared secret as header `x-contract-companion-secret`. The app will enqueue the document, analyze it with the configured AI provider, and wait for manual approval before writing tags/custom fields back to Paperless.
+
 ## Data and Networking

 - Contract data is stored in the named Docker volume `contracts-data`.
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -3,6 +3,8 @@ import { BrowserRouter, Navigate, Route, Routes, useLocation } from "react-route

 import Layout from "./components/Layout";
 import { useAuth } from "./contexts/AuthContext";
+import AiReviewDetail from "./routes/AiReviewDetail";
+import AiReviewList from "./routes/AiReviewList";
 import CalendarView from "./routes/CalendarView";
 import ContractDetail from "./routes/ContractDetail";
 import ContractForm from "./routes/ContractForm";
@@ -45,6 +47,8 @@ export default function App() {
        >
          <Route index element={<Navigate to="/dashboard" replace />} />
          <Route path="dashboard" element={<Dashboard />} />
+          <Route path="ai-reviews" element={<AiReviewList />} />
+          <Route path="ai-reviews/:reviewId" element={<AiReviewDetail />} />
          <Route path="contracts" element={<ContractsList />} />
          <Route path="contracts/new" element={<ContractForm mode="create" />} />
          <Route path="contracts/:contractId" element={<ContractDetail />} />
--- a/frontend/src/api/aiReviews.ts
+++ b/frontend/src/api/aiReviews.ts
@@ -0,0 +1,33 @@
+import { AiReview, AiReviewStatus, Contract, ContractPayload } from "../types";
+import { request } from "./client";
+
+export async function fetchAiReviews(status?: AiReviewStatus): Promise<AiReview[]> {
+  const params = new URLSearchParams();
+  if (status) {
+    params.set("status", status);
+  }
+  const query = params.toString();
+  return request<AiReview[]>(`/ai/reviews${query ? `?${query}` : ""}`, { method: "GET" });
+}
+
+export async function fetchAiReview(id: number): Promise<AiReview> {
+  return request<AiReview>(`/ai/reviews/${id}`, { method: "GET" });
+}
+
+export async function retryAiReview(id: number): Promise<AiReview> {
+  return request<AiReview>(`/ai/reviews/${id}/retry`, { method: "POST" });
+}
+
+export async function rejectAiReview(id: number): Promise<AiReview> {
+  return request<AiReview>(`/ai/reviews/${id}/reject`, { method: "POST" });
+}
+
+export async function approveAiReview(
+  id: number,
+  contract: ContractPayload
+): Promise<{ review: AiReview; contract: Contract }> {
+  return request<{ review: AiReview; contract: Contract }>(`/ai/reviews/${id}/approve`, {
+    method: "POST",
+    body: { contract }
+  });
+}
--- a/frontend/src/api/config.ts
+++ b/frontend/src/api/config.ts
@@ -18,6 +18,10 @@ export interface ServerConfig {
  ntfyConfigured: boolean;
  authEnabled: boolean;
  authTokenExpiresInHours: number;
+  aiEnabled: boolean;
+  aiConfigured: boolean;
+  aiProvider: "openai" | "openai-compatible" | "gemini" | null;
+  paperlessWebhookConfigured: boolean;
 }

 export async function fetchServerConfig(): Promise<ServerConfig> {
@@ -42,12 +46,21 @@ export interface SettingsResponse {
    ntfyTopic: string | null;
    ntfyPriority: string | null;
    authUsername: string | null;
+    aiEnabled: boolean;
+    aiProvider: "openai" | "openai-compatible" | "gemini" | null;
+    aiBaseUrl: string | null;
+    aiModel: string | null;
+    aiSystemPrompt: string | null;
+    aiTimeoutSeconds: number;
+    aiMaxTokens: number;
  };
  secrets: {
    paperlessTokenSet: boolean;
    mailPasswordSet: boolean;
    ntfyTokenSet: boolean;
    authPasswordSet: boolean;
+    aiApiKeySet: boolean;
+    paperlessWebhookSecretSet: boolean;
  };
  icalSecret: string | null;
 }
@@ -74,6 +87,15 @@ export type UpdateSettingsPayload = Partial<{
  authUsername: string | null;
  authPassword: string | null;
  icalSecret: string | null;
+  aiEnabled: boolean;
+  aiProvider: "openai" | "openai-compatible" | "gemini" | null;
+  aiBaseUrl: string | null;
+  aiModel: string | null;
+  aiApiKey: string | null;
+  aiSystemPrompt: string | null;
+  aiTimeoutSeconds: number;
+  aiMaxTokens: number;
+  paperlessWebhookSecret: string | null;
 }>;

 export async function fetchSettings(): Promise<SettingsResponse> {
@@ -95,3 +117,7 @@ export async function triggerMailTest(): Promise<void> {
 export async function triggerNtfyTest(): Promise<void> {
  await request("/settings/test/ntfy", { method: "POST" });
 }
+
+export async function triggerAiTest(): Promise<void> {
+  await request("/settings/test/ai", { method: "POST" });
+}
--- a/frontend/src/components/Layout.tsx
+++ b/frontend/src/components/Layout.tsx
@@ -3,6 +3,7 @@ import LogoutIcon from "@mui/icons-material/Logout";
 import CalendarMonthIcon from "@mui/icons-material/CalendarMonth";
 import DashboardIcon from "@mui/icons-material/Dashboard";
 import DescriptionIcon from "@mui/icons-material/Description";
+import AutoAwesomeIcon from "@mui/icons-material/AutoAwesome";
 import SettingsIcon from "@mui/icons-material/Settings";
 import {
  AppBar,
@@ -33,6 +34,7 @@ const drawerWidth = 240;

 const navItems = [
  { key: "nav.dashboard", icon: <DashboardIcon />, path: "/dashboard" },
+  { key: "nav.aiReviews", icon: <AutoAwesomeIcon />, path: "/ai-reviews" },
  { key: "nav.contracts", icon: <DescriptionIcon />, path: "/contracts" },
  { key: "nav.calendar", icon: <CalendarMonthIcon />, path: "/calendar" },
  { key: "nav.settings", icon: <SettingsIcon />, path: "/settings" }
--- a/frontend/src/locales/de/common.json
+++ b/frontend/src/locales/de/common.json
@@ -1,6 +1,7 @@
 {
  "nav": {
    "dashboard": "Dashboard",
+    "aiReviews": "AI-Prüfung",
    "contracts": "Verträge",
    "calendar": "Kalender",
    "settings": "Einstellungen",
@@ -175,6 +176,29 @@
    "scheduler": "Fristen & Benachrichtigungen",
    "mail": "E-Mail",
    "ntfy": "ntfy Push",
+    "ai": "AI-Analyse",
+    "aiEnabled": "AI-Analyse aktivieren",
+    "aiProvider": "AI-Anbieter",
+    "aiProviderNone": "Kein Anbieter",
+    "aiBaseUrl": "AI Base URL",
+    "aiBaseUrlPlaceholder": "Leer lassen für Anbieter-Standard",
+    "aiBaseUrlHelp": "Für OpenAI-kompatible Anbieter oder eigene Gateways.",
+    "aiModel": "Modell",
+    "aiApiKey": "API-Key",
+    "aiApiKeyNew": "Neuen API-Key hinterlegen",
+    "aiApiKeyRemove": "API-Key löschen",
+    "aiApiKeyInfo": "Ein API-Key ist hinterlegt. Lasse das Feld leer, um ihn unverändert zu lassen.",
+    "aiSystemPrompt": "Systemprompt",
+    "aiTimeout": "Timeout (Sekunden)",
+    "aiMaxTokens": "Max Tokens",
+    "aiTest": "AI testen",
+    "aiTestSuccess": "AI-Test erfolgreich",
+    "aiTestError": "AI-Test fehlgeschlagen",
+    "webhookSecret": "Paperless Webhook-Secret",
+    "webhookSecretNew": "Neues Webhook-Secret hinterlegen",
+    "webhookSecretRemove": "Webhook-Secret löschen",
+    "webhookSecretInfo": "Ein Webhook-Secret ist hinterlegt. Lasse das Feld leer, um es unverändert zu lassen.",
+    "webhookSecretHelp": "Paperless sendet diesen Wert im Header x-contract-companion-secret.",
    "ical": "iCal-Abo",
    "icalFeedUrl": "Feed-URL",
    "paperlessApiUrl": "Paperless API URL",
@@ -261,6 +285,46 @@
    "correspondent": "Korrespondent",
    "cancel": "Abbrechen"
  },
+  "aiReviews": {
+    "title": "AI-Prüfung",
+    "subtitle": "Neue Paperless-Dokumente prüfen, Vertragsentwürfe freigeben und nach Paperless zurückschreiben.",
+    "refresh": "Aktualisieren",
+    "aiNotConfigured": "AI ist noch nicht vollständig konfiguriert.",
+    "webhookNotConfigured": "Das Paperless Webhook-Secret ist noch nicht gesetzt.",
+    "document": "Dokument",
+    "review": "Prüfen",
+    "loadError": "AI-Prüfungen konnten nicht geladen werden.",
+    "empty": "Noch keine AI-Prüfungen vorhanden.",
+    "detailSubtitle": "Paperless-Dokument #{{id}}",
+    "summary": "AI-Zusammenfassung",
+    "detectedContract": "Die AI stuft das Dokument als Vertrag ein.",
+    "detectedNoContract": "Die AI stuft das Dokument nicht als Vertrag ein.",
+    "noAnalysis": "Noch keine Analyse vorhanden.",
+    "contractDraft": "Vertragsentwurf",
+    "noContractDraft": "Die Analyse enthält keinen Vertragsentwurf. Du kannst manuell Daten ergänzen oder den Fall ablehnen.",
+    "approve": "Freigeben und Vertrag anlegen",
+    "approved": "Vertrag angelegt und Paperless aktualisiert",
+    "reject": "Ablehnen",
+    "rejected": "Prüfung abgelehnt",
+    "retry": "Erneut analysieren",
+    "retryStarted": "Analyse erneut gestartet",
+    "actionFailed": "Aktion fehlgeschlagen",
+    "columns": {
+      "document": "Dokument",
+      "status": "Status",
+      "confidence": "Sicherheit",
+      "updated": "Aktualisiert",
+      "action": "Aktion"
+    },
+    "status": {
+      "pending": "Wartet",
+      "analyzing": "Analyse läuft",
+      "needs_review": "Prüfung nötig",
+      "approved": "Freigegeben",
+      "rejected": "Abgelehnt",
+      "failed": "Fehler"
+    }
+  },
  "login": {
    "title": "Anmeldung",
    "welcome": "Willkommen zurück! Bitte melde dich an.",
--- a/frontend/src/locales/en/common.json
+++ b/frontend/src/locales/en/common.json
@@ -1,6 +1,7 @@
 {
  "nav": {
    "dashboard": "Dashboard",
+    "aiReviews": "AI review",
    "contracts": "Contracts",
    "calendar": "Calendar",
    "settings": "Settings",
@@ -175,6 +176,29 @@
    "scheduler": "Deadlines & notifications",
    "mail": "E-mail",
    "ntfy": "ntfy push",
+    "ai": "AI analysis",
+    "aiEnabled": "Enable AI analysis",
+    "aiProvider": "AI provider",
+    "aiProviderNone": "No provider",
+    "aiBaseUrl": "AI base URL",
+    "aiBaseUrlPlaceholder": "Leave empty for provider default",
+    "aiBaseUrlHelp": "For OpenAI-compatible providers or custom gateways.",
+    "aiModel": "Model",
+    "aiApiKey": "API key",
+    "aiApiKeyNew": "Provide new API key",
+    "aiApiKeyRemove": "Remove API key",
+    "aiApiKeyInfo": "An API key is stored. Leave empty to keep it.",
+    "aiSystemPrompt": "System prompt",
+    "aiTimeout": "Timeout (seconds)",
+    "aiMaxTokens": "Max tokens",
+    "aiTest": "Test AI",
+    "aiTestSuccess": "AI test successful",
+    "aiTestError": "AI test failed",
+    "webhookSecret": "Paperless webhook secret",
+    "webhookSecretNew": "Provide new webhook secret",
+    "webhookSecretRemove": "Remove webhook secret",
+    "webhookSecretInfo": "A webhook secret is stored. Leave empty to keep it.",
+    "webhookSecretHelp": "Paperless sends this value in the x-contract-companion-secret header.",
    "ical": "iCal subscription",
    "icalFeedUrl": "Feed URL",
    "paperlessApiUrl": "Paperless API URL",
@@ -261,6 +285,46 @@
    "correspondent": "Correspondent",
    "cancel": "Cancel"
  },
+  "aiReviews": {
+    "title": "AI review",
+    "subtitle": "Review new Paperless documents, approve contract drafts, and write metadata back to Paperless.",
+    "refresh": "Refresh",
+    "aiNotConfigured": "AI is not fully configured yet.",
+    "webhookNotConfigured": "The Paperless webhook secret is not set yet.",
+    "document": "Document",
+    "review": "Review",
+    "loadError": "Unable to load AI reviews.",
+    "empty": "No AI reviews yet.",
+    "detailSubtitle": "Paperless document #{{id}}",
+    "summary": "AI summary",
+    "detectedContract": "AI classified this document as a contract.",
+    "detectedNoContract": "AI did not classify this document as a contract.",
+    "noAnalysis": "No analysis available yet.",
+    "contractDraft": "Contract draft",
+    "noContractDraft": "The analysis contains no contract draft. You can add data manually or reject the review.",
+    "approve": "Approve and create contract",
+    "approved": "Contract created and Paperless updated",
+    "reject": "Reject",
+    "rejected": "Review rejected",
+    "retry": "Analyze again",
+    "retryStarted": "Analysis restarted",
+    "actionFailed": "Action failed",
+    "columns": {
+      "document": "Document",
+      "status": "Status",
+      "confidence": "Confidence",
+      "updated": "Updated",
+      "action": "Action"
+    },
+    "status": {
+      "pending": "Pending",
+      "analyzing": "Analyzing",
+      "needs_review": "Needs review",
+      "approved": "Approved",
+      "rejected": "Rejected",
+      "failed": "Failed"
+    }
+  },
  "login": {
    "title": "Sign in",
    "welcome": "Welcome back! Please sign in.",
--- a/frontend/src/routes/AiReviewDetail.tsx
+++ b/frontend/src/routes/AiReviewDetail.tsx
@@ -0,0 +1,328 @@
+import CheckIcon from "@mui/icons-material/Check";
+import CloseIcon from "@mui/icons-material/Close";
+import LaunchIcon from "@mui/icons-material/Launch";
+import ReplayIcon from "@mui/icons-material/Replay";
+import {
+  Alert,
+  Box,
+  Button,
+  Chip,
+  FormControlLabel,
+  Grid,
+  Paper,
+  Stack,
+  Switch,
+  TextField,
+  Typography
+} from "@mui/material";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { useEffect, useMemo, useState } from "react";
+import { useTranslation } from "react-i18next";
+import { useNavigate, useParams } from "react-router-dom";
+
+import { approveAiReview, fetchAiReview, rejectAiReview, retryAiReview } from "../api/aiReviews";
+import { fetchServerConfig } from "../api/config";
+import PageHeader from "../components/PageHeader";
+import { useSnackbar } from "../hooks/useSnackbar";
+import { ContractPayload } from "../types";
+
+type FormState = {
+  title: string;
+  provider: string;
+  category: string;
+  contractStartDate: string;
+  contractEndDate: string;
+  terminationNoticeDays: string;
+  renewalPeriodMonths: string;
+  autoRenew: boolean;
+  price: string;
+  currency: string;
+  notes: string;
+  tags: string;
+};
+
+const emptyForm: FormState = {
+  title: "",
+  provider: "",
+  category: "",
+  contractStartDate: "",
+  contractEndDate: "",
+  terminationNoticeDays: "",
+  renewalPeriodMonths: "",
+  autoRenew: false,
+  price: "",
+  currency: "EUR",
+  notes: "",
+  tags: ""
+};
+
+function toStringValue(value: unknown): string {
+  if (value === null || value === undefined) {
+    return "";
+  }
+  return String(value);
+}
+
+function parseNumber(value: string, integer = false): number | null {
+  const trimmed = value.trim();
+  if (!trimmed) {
+    return null;
+  }
+  const parsed = Number(trimmed.replace(",", "."));
+  if (!Number.isFinite(parsed)) {
+    throw new Error("Invalid number");
+  }
+  return integer ? Math.round(parsed) : parsed;
+}
+
+export default function AiReviewDetail() {
+  const { reviewId } = useParams<{ reviewId: string }>();
+  const id = reviewId ? Number(reviewId) : null;
+  const navigate = useNavigate();
+  const { t } = useTranslation();
+  const { showMessage } = useSnackbar();
+  const queryClient = useQueryClient();
+  const [form, setForm] = useState<FormState>(emptyForm);
+
+  const {
+    data: review,
+    isLoading,
+    isError
+  } = useQuery({
+    queryKey: ["ai-review", id],
+    queryFn: () => fetchAiReview(id ?? 0),
+    enabled: id !== null
+  });
+  const { data: serverConfig } = useQuery({
+    queryKey: ["server-config"],
+    queryFn: fetchServerConfig
+  });
+
+  useEffect(() => {
+    if (!review?.contractPayload) {
+      return;
+    }
+    const payload = review.contractPayload;
+    setForm({
+      title: payload.title ?? "",
+      provider: payload.provider ?? "",
+      category: payload.category ?? "",
+      contractStartDate: payload.contractStartDate ?? "",
+      contractEndDate: payload.contractEndDate ?? "",
+      terminationNoticeDays: toStringValue(payload.terminationNoticeDays),
+      renewalPeriodMonths: toStringValue(payload.renewalPeriodMonths),
+      autoRenew: payload.autoRenew ?? false,
+      price: toStringValue(payload.price),
+      currency: payload.currency ?? "EUR",
+      notes: payload.notes ?? "",
+      tags: payload.tags?.join(", ") ?? ""
+    });
+  }, [review]);
+
+  const paperlessUrl = useMemo(() => {
+    if (!review || !serverConfig) {
+      return null;
+    }
+    const base = serverConfig.paperlessExternalUrl ?? serverConfig.paperlessBaseUrl;
+    return base ? `${base.replace(/\/$/, "")}/documents/${review.paperlessDocumentId}` : null;
+  }, [review, serverConfig]);
+
+  const refreshQueries = async () => {
+    await Promise.all([
+      queryClient.invalidateQueries({ queryKey: ["ai-reviews"] }),
+      queryClient.invalidateQueries({ queryKey: ["ai-review", id] }),
+      queryClient.invalidateQueries({ queryKey: ["contracts"] })
+    ]);
+  };
+
+  const retryMutation = useMutation({
+    mutationFn: () => retryAiReview(id ?? 0),
+    onSuccess: async () => {
+      showMessage(t("aiReviews.retryStarted"), "success");
+      await refreshQueries();
+    },
+    onError: (error: Error) => showMessage(error.message ?? t("aiReviews.actionFailed"), "error")
+  });
+
+  const rejectMutation = useMutation({
+    mutationFn: () => rejectAiReview(id ?? 0),
+    onSuccess: async () => {
+      showMessage(t("aiReviews.rejected"), "success");
+      await refreshQueries();
+      navigate("/ai-reviews");
+    },
+    onError: (error: Error) => showMessage(error.message ?? t("aiReviews.actionFailed"), "error")
+  });
+
+  const approveMutation = useMutation({
+    mutationFn: () => {
+      const contract: ContractPayload = {
+        title: form.title.trim(),
+        provider: form.provider.trim() || null,
+        category: form.category.trim() || null,
+        paperlessDocumentId: review?.paperlessDocumentId ?? null,
+        contractStartDate: form.contractStartDate || null,
+        contractEndDate: form.contractEndDate || null,
+        terminationNoticeDays: parseNumber(form.terminationNoticeDays, true),
+        renewalPeriodMonths: parseNumber(form.renewalPeriodMonths, true),
+        autoRenew: form.autoRenew,
+        price: parseNumber(form.price),
+        currency: form.currency.trim() || "EUR",
+        notes: form.notes.trim() || null,
+        tags: form.tags
+          .split(",")
+          .map((tag) => tag.trim())
+          .filter(Boolean)
+      };
+      return approveAiReview(id ?? 0, contract);
+    },
+    onSuccess: async (result) => {
+      showMessage(t("aiReviews.approved"), "success");
+      await refreshQueries();
+      navigate(`/contracts/${result.contract.id}`);
+    },
+    onError: (error: Error) => {
+      const message = error.message === "Invalid number" ? t("contractForm.invalidNumber") : error.message;
+      showMessage(message ?? t("aiReviews.actionFailed"), "error");
+    }
+  });
+
+  const updateField = <K extends keyof FormState>(key: K, value: FormState[K]) => {
+    setForm((current) => ({ ...current, [key]: value }));
+  };
+
+  if (isLoading) {
+    return <Typography>{t("messages.loading")}</Typography>;
+  }
+
+  if (isError || !review) {
+    return <Alert severity="error">{t("aiReviews.loadError")}</Alert>;
+  }
+
+  const canApprove = review.status !== "approved" && review.status !== "rejected" && Boolean(form.title.trim());
+
+  return (
+    <>
+      <PageHeader
+        title={review.documentTitle ?? `${t("aiReviews.document")} #${review.paperlessDocumentId}`}
+        subtitle={t("aiReviews.detailSubtitle", { id: review.paperlessDocumentId })}
+        action={
+          paperlessUrl ? (
+            <Button href={paperlessUrl} target="_blank" rel="noreferrer" startIcon={<LaunchIcon />} variant="outlined">
+              {t("contractDetail.openInPaperless")}
+            </Button>
+          ) : undefined
+        }
+      />
+
+      <Grid container spacing={3}>
+        <Grid item xs={12} md={5}>
+          <Paper variant="outlined" sx={{ borderRadius: 3, p: 3 }}>
+            <Stack spacing={2}>
+              <Box display="flex" alignItems="center" gap={1}>
+                <Chip label={t(`aiReviews.status.${review.status}`)} />
+                {review.confidence !== null && (
+                  <Chip label={`${Math.round(review.confidence * 100)}%`} color="primary" variant="outlined" />
+                )}
+              </Box>
+              {review.error && <Alert severity="error">{review.error}</Alert>}
+              {review.analysis ? (
+                <>
+                  <Typography variant="h6">{t("aiReviews.summary")}</Typography>
+                  <Typography whiteSpace="pre-wrap">{review.analysis.summary}</Typography>
+                  <Typography variant="body2" color="text.secondary">
+                    {review.analysis.isContract ? t("aiReviews.detectedContract") : t("aiReviews.detectedNoContract")}
+                  </Typography>
+                </>
+              ) : (
+                <Alert severity="info">{t("aiReviews.noAnalysis")}</Alert>
+              )}
+              <Stack direction={{ xs: "column", sm: "row" }} spacing={1}>
+                <Button
+                  startIcon={<ReplayIcon />}
+                  variant="outlined"
+                  onClick={() => retryMutation.mutate()}
+                  disabled={retryMutation.isPending || review.status === "approved"}
+                >
+                  {t("aiReviews.retry")}
+                </Button>
+                <Button
+                  startIcon={<CloseIcon />}
+                  color="warning"
+                  variant="outlined"
+                  onClick={() => rejectMutation.mutate()}
+                  disabled={rejectMutation.isPending || review.status === "approved" || review.status === "rejected"}
+                >
+                  {t("aiReviews.reject")}
+                </Button>
+              </Stack>
+            </Stack>
+          </Paper>
+        </Grid>
+
+        <Grid item xs={12} md={7}>
+          <Paper variant="outlined" sx={{ borderRadius: 3, p: 3 }}>
+            <Stack spacing={2}>
+              <Typography variant="h6">{t("aiReviews.contractDraft")}</Typography>
+              {!review.contractPayload && (
+                <Alert severity="warning">{t("aiReviews.noContractDraft")}</Alert>
+              )}
+              <Grid container spacing={2}>
+                <Grid item xs={12} md={6}>
+                  <TextField label={t("contractForm.fields.title")} value={form.title} onChange={(event) => updateField("title", event.target.value)} fullWidth required />
+                </Grid>
+                <Grid item xs={12} md={6}>
+                  <TextField label={t("contractForm.fields.provider")} value={form.provider} onChange={(event) => updateField("provider", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={6}>
+                  <TextField label={t("contractForm.fields.category")} value={form.category} onChange={(event) => updateField("category", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={6}>
+                  <TextField label={t("contractForm.fields.currency")} value={form.currency} onChange={(event) => updateField("currency", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={6}>
+                  <TextField type="date" label={t("contractForm.fields.contractStart")} value={form.contractStartDate} onChange={(event) => updateField("contractStartDate", event.target.value)} InputLabelProps={{ shrink: true }} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={6}>
+                  <TextField type="date" label={t("contractForm.fields.contractEnd")} value={form.contractEndDate} onChange={(event) => updateField("contractEndDate", event.target.value)} InputLabelProps={{ shrink: true }} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={4}>
+                  <TextField label={t("contractForm.fields.terminationNotice")} value={form.terminationNoticeDays} onChange={(event) => updateField("terminationNoticeDays", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={4}>
+                  <TextField label={t("contractForm.fields.renewalPeriod")} value={form.renewalPeriodMonths} onChange={(event) => updateField("renewalPeriodMonths", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12} md={4}>
+                  <TextField label={t("contractForm.fields.price")} value={form.price} onChange={(event) => updateField("price", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12}>
+                  <FormControlLabel
+                    control={<Switch checked={form.autoRenew} onChange={(event) => updateField("autoRenew", event.target.checked)} />}
+                    label={t("contractForm.fields.autoRenew")}
+                  />
+                </Grid>
+                <Grid item xs={12}>
+                  <TextField label={t("contractForm.fields.tags")} value={form.tags} onChange={(event) => updateField("tags", event.target.value)} fullWidth />
+                </Grid>
+                <Grid item xs={12}>
+                  <TextField label={t("contractForm.fields.notes")} value={form.notes} onChange={(event) => updateField("notes", event.target.value)} fullWidth multiline minRows={4} />
+                </Grid>
+              </Grid>
+
+              <Box display="flex" justifyContent="flex-end">
+                <Button
+                  startIcon={<CheckIcon />}
+                  variant="contained"
+                  onClick={() => approveMutation.mutate()}
+                  disabled={!canApprove || approveMutation.isPending}
+                >
+                  {t("aiReviews.approve")}
+                </Button>
+              </Box>
+            </Stack>
+          </Paper>
+        </Grid>
+      </Grid>
+    </>
+  );
+}
--- a/frontend/src/routes/AiReviewList.tsx
+++ b/frontend/src/routes/AiReviewList.tsx
@@ -0,0 +1,154 @@
+import AutoAwesomeIcon from "@mui/icons-material/AutoAwesome";
+import RefreshIcon from "@mui/icons-material/Refresh";
+import {
+  Alert,
+  Box,
+  Button,
+  Chip,
+  Paper,
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableRow,
+  Typography
+} from "@mui/material";
+import { useQuery } from "@tanstack/react-query";
+import { useTranslation } from "react-i18next";
+import { useNavigate } from "react-router-dom";
+
+import { fetchAiReviews } from "../api/aiReviews";
+import { fetchServerConfig } from "../api/config";
+import PageHeader from "../components/PageHeader";
+import { formatDate } from "../utils/date";
+
+function statusColor(status: string): "default" | "primary" | "success" | "warning" | "error" {
+  if (status === "approved") return "success";
+  if (status === "needs_review") return "primary";
+  if (status === "failed") return "error";
+  if (status === "analyzing" || status === "pending") return "warning";
+  return "default";
+}
+
+export default function AiReviewList() {
+  const { t } = useTranslation();
+  const navigate = useNavigate();
+  const {
+    data: reviews,
+    isLoading,
+    isError,
+    refetch,
+    isFetching
+  } = useQuery({
+    queryKey: ["ai-reviews"],
+    queryFn: () => fetchAiReviews()
+  });
+  const { data: serverConfig } = useQuery({
+    queryKey: ["server-config"],
+    queryFn: fetchServerConfig
+  });
+
+  return (
+    <>
+      <PageHeader
+        title={t("aiReviews.title")}
+        subtitle={t("aiReviews.subtitle")}
+        action={
+          <Button
+            variant="outlined"
+            startIcon={<RefreshIcon />}
+            onClick={() => refetch()}
+            disabled={isFetching}
+          >
+            {t("aiReviews.refresh")}
+          </Button>
+        }
+      />
+
+      {!serverConfig?.aiConfigured && (
+        <Alert severity="warning" sx={{ mb: 2 }}>
+          {t("aiReviews.aiNotConfigured")}
+        </Alert>
+      )}
+      {!serverConfig?.paperlessWebhookConfigured && (
+        <Alert severity="info" sx={{ mb: 2 }}>
+          {t("aiReviews.webhookNotConfigured")}
+        </Alert>
+      )}
+
+      <Paper variant="outlined" sx={{ borderRadius: 3, p: 2.5 }}>
+        <Table>
+          <TableHead>
+            <TableRow>
+              <TableCell>{t("aiReviews.columns.document")}</TableCell>
+              <TableCell>{t("aiReviews.columns.status")}</TableCell>
+              <TableCell>{t("aiReviews.columns.confidence")}</TableCell>
+              <TableCell>{t("aiReviews.columns.updated")}</TableCell>
+              <TableCell align="right">{t("aiReviews.columns.action")}</TableCell>
+            </TableRow>
+          </TableHead>
+          <TableBody>
+            {isLoading && (
+              <TableRow>
+                <TableCell colSpan={5}>{t("messages.loading")}</TableCell>
+              </TableRow>
+            )}
+            {isError && (
+              <TableRow>
+                <TableCell colSpan={5}>
+                  <Typography color="error">{t("aiReviews.loadError")}</Typography>
+                </TableCell>
+              </TableRow>
+            )}
+            {!isLoading && !isError && (reviews ?? []).length === 0 && (
+              <TableRow>
+                <TableCell colSpan={5}>
+                  <Box display="flex" alignItems="center" gap={1}>
+                    <AutoAwesomeIcon color="disabled" />
+                    <Typography color="text.secondary">{t("aiReviews.empty")}</Typography>
+                  </Box>
+                </TableCell>
+              </TableRow>
+            )}
+            {(reviews ?? []).map((review) => (
+              <TableRow
+                hover
+                key={review.id}
+                sx={{ cursor: "pointer" }}
+                onClick={() => navigate(`/ai-reviews/${review.id}`)}
+              >
+                <TableCell>
+                  <Typography fontWeight={600}>
+                    {review.documentTitle ?? `${t("aiReviews.document")} #${review.paperlessDocumentId}`}
+                  </Typography>
+                  <Typography variant="caption" color="text.secondary">
+                    Paperless #{review.paperlessDocumentId}
+                  </Typography>
+                </TableCell>
+                <TableCell>
+                  <Chip
+                    size="small"
+                    color={statusColor(review.status)}
+                    label={t(`aiReviews.status.${review.status}`)}
+                  />
+                </TableCell>
+                <TableCell>
+                  {review.confidence !== null ? `${Math.round(review.confidence * 100)}%` : "-"}
+                </TableCell>
+                <TableCell>{formatDate(review.updatedAt, "dd.MM.yyyy HH:mm")}</TableCell>
+                <TableCell align="right">
+                  <Button size="small" onClick={(event) => {
+                    event.stopPropagation();
+                    navigate(`/ai-reviews/${review.id}`);
+                  }}>
+                    {t("aiReviews.review")}
+                  </Button>
+                </TableCell>
+              </TableRow>
+            ))}
+          </TableBody>
+        </Table>
+      </Paper>
+    </>
+  );
+}
--- a/frontend/src/routes/Settings.tsx
+++ b/frontend/src/routes/Settings.tsx
@@ -35,6 +35,7 @@ import {
  fetchServerConfig,
  fetchSettings,
  resetIcalSecret,
+  triggerAiTest,
  triggerMailTest,
  triggerNtfyTest,
  ServerConfig,
@@ -75,6 +76,15 @@ type FormValues = {
  ntfyPriority: string;
  authUsername: string;
  authPassword: string;
+  aiEnabled: boolean;
+  aiProvider: "openai" | "openai-compatible" | "gemini" | "";
+  aiBaseUrl: string;
+  aiModel: string;
+  aiApiKey: string;
+  aiSystemPrompt: string;
+  aiTimeoutSeconds: number;
+  aiMaxTokens: number;
+  paperlessWebhookSecret: string;
 };

 const defaultValues: FormValues = {
@@ -97,7 +107,16 @@ const defaultValues: FormValues = {
  ntfyToken: "",
  ntfyPriority: "default",
  authUsername: "",
-  authPassword: ""
+  authPassword: "",
+  aiEnabled: false,
+  aiProvider: "",
+  aiBaseUrl: "",
+  aiModel: "",
+  aiApiKey: "",
+  aiSystemPrompt: "",
+  aiTimeoutSeconds: 60,
+  aiMaxTokens: 2000,
+  paperlessWebhookSecret: ""
 };

 export default function SettingsPage() {
@@ -146,6 +165,8 @@ export default function SettingsPage() {
  const [removeMailPassword, setRemoveMailPassword] = useState(false);
  const [removeNtfyToken, setRemoveNtfyToken] = useState(false);
  const [removeAuthPassword, setRemoveAuthPassword] = useState(false);
+  const [removeAiApiKey, setRemoveAiApiKey] = useState(false);
+  const [removeWebhookSecret, setRemoveWebhookSecret] = useState(false);

  const {
    control,
@@ -182,7 +203,16 @@ export default function SettingsPage() {
      ntfyToken: "",
      ntfyPriority: settingsData.values.ntfyPriority ?? "default",
      authUsername: settingsData.values.authUsername ?? "",
-      authPassword: ""
+      authPassword: "",
+      aiEnabled: settingsData.values.aiEnabled ?? false,
+      aiProvider: settingsData.values.aiProvider ?? "",
+      aiBaseUrl: settingsData.values.aiBaseUrl ?? "",
+      aiModel: settingsData.values.aiModel ?? "",
+      aiApiKey: "",
+      aiSystemPrompt: settingsData.values.aiSystemPrompt ?? "",
+      aiTimeoutSeconds: settingsData.values.aiTimeoutSeconds ?? 60,
+      aiMaxTokens: settingsData.values.aiMaxTokens ?? 2000,
+      paperlessWebhookSecret: ""
    };

    initialValuesRef.current = values;
@@ -190,6 +220,8 @@ export default function SettingsPage() {
    setRemoveMailPassword(false);
    setRemoveNtfyToken(false);
    setRemoveAuthPassword(false);
+    setRemoveAiApiKey(false);
+    setRemoveWebhookSecret(false);
    reset(values);
  }, [settingsData, reset]);

@@ -225,6 +257,12 @@ export default function SettingsPage() {
    onError: (error: Error) => showMessage(error.message ?? t("settings.ntfyTestError"), "error")
  });

+  const aiTestMutation = useMutation({
+    mutationFn: () => triggerAiTest(),
+    onSuccess: () => showMessage(t("settings.aiTestSuccess"), "success"),
+    onError: (error: Error) => showMessage(error.message ?? t("settings.aiTestError"), "error")
+  });
+
  const createCategoryMutation = useMutation({
    mutationFn: (name: string) => apiCreateCategory(name),
    onSuccess: async (category) => {
@@ -386,6 +424,38 @@ export default function SettingsPage() {
      payload.authPassword = formValues.authPassword.trim();
    }

+    if (formValues.aiEnabled !== initial.aiEnabled) {
+      payload.aiEnabled = formValues.aiEnabled;
+    }
+    if (formValues.aiProvider !== initial.aiProvider) {
+      payload.aiProvider = formValues.aiProvider ? formValues.aiProvider : null;
+    }
+    if (formValues.aiBaseUrl !== initial.aiBaseUrl) {
+      payload.aiBaseUrl = trimOrNull(formValues.aiBaseUrl);
+    }
+    if (formValues.aiModel !== initial.aiModel) {
+      payload.aiModel = trimOrNull(formValues.aiModel);
+    }
+    if (removeAiApiKey) {
+      payload.aiApiKey = null;
+    } else if (formValues.aiApiKey.trim().length > 0) {
+      payload.aiApiKey = formValues.aiApiKey.trim();
+    }
+    if (formValues.aiSystemPrompt !== initial.aiSystemPrompt) {
+      payload.aiSystemPrompt = trimOrNull(formValues.aiSystemPrompt);
+    }
+    if (formValues.aiTimeoutSeconds !== initial.aiTimeoutSeconds) {
+      payload.aiTimeoutSeconds = formValues.aiTimeoutSeconds;
+    }
+    if (formValues.aiMaxTokens !== initial.aiMaxTokens) {
+      payload.aiMaxTokens = formValues.aiMaxTokens;
+    }
+    if (removeWebhookSecret) {
+      payload.paperlessWebhookSecret = null;
+    } else if (formValues.paperlessWebhookSecret.trim().length > 0) {
+      payload.paperlessWebhookSecret = formValues.paperlessWebhookSecret.trim();
+    }
+
    if (Object.keys(payload).length === 0) {
      showMessage(t("settings.noChanges"), "info");
      return;
@@ -425,6 +495,8 @@ export default function SettingsPage() {
  const mailPasswordSet = settings?.secrets.mailPasswordSet ?? false;
  const ntfyTokenSet = settings?.secrets.ntfyTokenSet ?? false;
  const authPasswordSet = settings?.secrets.authPasswordSet ?? false;
+  const aiApiKeySet = settings?.secrets.aiApiKeySet ?? false;
+  const paperlessWebhookSecretSet = settings?.secrets.paperlessWebhookSecretSet ?? false;

  return (
    <>
@@ -675,6 +747,135 @@ export default function SettingsPage() {
            </CardContent>
          </Card>

+          <Card variant="outlined" sx={{ borderRadius: 3 }}>
+            <CardContent>
+              <Typography variant="h6" gutterBottom>
+                {t("settings.ai")}
+              </Typography>
+              {loading ? (
+                <CircularProgress size={24} />
+              ) : (
+                <Stack spacing={2}>
+                  <FormControlLabel
+                    control={
+                      <Controller
+                        name="aiEnabled"
+                        control={control}
+                        render={({ field }) => <Switch {...field} checked={field.value} />}
+                      />
+                    }
+                    label={t("settings.aiEnabled")}
+                  />
+                  <TextField select label={t("settings.aiProvider")} {...register("aiProvider")} fullWidth>
+                    <MenuItem value="">{t("settings.aiProviderNone")}</MenuItem>
+                    <MenuItem value="openai">OpenAI</MenuItem>
+                    <MenuItem value="openai-compatible">OpenAI compatible</MenuItem>
+                    <MenuItem value="gemini">Gemini</MenuItem>
+                  </TextField>
+                  <TextField
+                    label={t("settings.aiBaseUrl")}
+                    {...register("aiBaseUrl")}
+                    placeholder={t("settings.aiBaseUrlPlaceholder")}
+                    helperText={t("settings.aiBaseUrlHelp")}
+                    fullWidth
+                  />
+                  <TextField label={t("settings.aiModel")} {...register("aiModel")} fullWidth />
+                  <Stack direction={{ xs: "column", sm: "row" }} spacing={2} alignItems={{ xs: "stretch", sm: "center" }}>
+                    <TextField
+                      label={aiApiKeySet && !removeAiApiKey ? t("settings.aiApiKeyNew") : t("settings.aiApiKey")}
+                      type="password"
+                      {...register("aiApiKey")}
+                      fullWidth
+                    />
+                    <Button
+                      variant="outlined"
+                      color={removeAiApiKey ? "inherit" : "warning"}
+                      onClick={() => {
+                        if (removeAiApiKey) {
+                          setRemoveAiApiKey(false);
+                        } else {
+                          setRemoveAiApiKey(true);
+                          setValue("aiApiKey", "", { shouldDirty: true });
+                        }
+                      }}
+                    >
+                      {removeAiApiKey ? t("settings.paperlessTokenKeep") : t("settings.aiApiKeyRemove")}
+                    </Button>
+                  </Stack>
+                  {aiApiKeySet && !removeAiApiKey && (
+                    <Typography variant="caption" color="text.secondary">
+                      {t("settings.aiApiKeyInfo")}
+                    </Typography>
+                  )}
+                  <TextField
+                    label={t("settings.aiSystemPrompt")}
+                    {...register("aiSystemPrompt")}
+                    fullWidth
+                    multiline
+                    minRows={3}
+                  />
+                  <Stack direction={{ xs: "column", sm: "row" }} spacing={2}>
+                    <TextField
+                      label={t("settings.aiTimeout")}
+                      type="number"
+                      inputProps={{ min: 5, max: 300 }}
+                      {...register("aiTimeoutSeconds", { valueAsNumber: true })}
+                      fullWidth
+                    />
+                    <TextField
+                      label={t("settings.aiMaxTokens")}
+                      type="number"
+                      inputProps={{ min: 256, max: 16000 }}
+                      {...register("aiMaxTokens", { valueAsNumber: true })}
+                      fullWidth
+                    />
+                  </Stack>
+                  <Stack direction={{ xs: "column", sm: "row" }} spacing={2} alignItems={{ xs: "stretch", sm: "center" }}>
+                    <TextField
+                      label={paperlessWebhookSecretSet && !removeWebhookSecret ? t("settings.webhookSecretNew") : t("settings.webhookSecret")}
+                      type="password"
+                      {...register("paperlessWebhookSecret")}
+                      fullWidth
+                      helperText={t("settings.webhookSecretHelp")}
+                    />
+                    <Button
+                      variant="outlined"
+                      color={removeWebhookSecret ? "inherit" : "warning"}
+                      onClick={() => {
+                        if (removeWebhookSecret) {
+                          setRemoveWebhookSecret(false);
+                        } else {
+                          setRemoveWebhookSecret(true);
+                          setValue("paperlessWebhookSecret", "", { shouldDirty: true });
+                        }
+                      }}
+                    >
+                      {removeWebhookSecret ? t("settings.paperlessTokenKeep") : t("settings.webhookSecretRemove")}
+                    </Button>
+                  </Stack>
+                  {paperlessWebhookSecretSet && !removeWebhookSecret && (
+                    <Typography variant="caption" color="text.secondary">
+                      {t("settings.webhookSecretInfo")}
+                    </Typography>
+                  )}
+                  <Stack direction={{ xs: "column", sm: "row" }} spacing={2}>
+                    <Button
+                      variant="outlined"
+                      onClick={() => aiTestMutation.mutate()}
+                      disabled={aiTestMutation.isPending || !serverConfig?.aiConfigured}
+                    >
+                      {t("settings.aiTest")}
+                    </Button>
+                    {aiTestMutation.isPending && <CircularProgress size={24} />}
+                  </Stack>
+                  {aiTestMutation.isError && (
+                    <Alert severity="error">{(aiTestMutation.error as Error).message ?? t("settings.aiTestError")}</Alert>
+                  )}
+                </Stack>
+              )}
+            </CardContent>
+          </Card>
+
          <Card variant="outlined" sx={{ borderRadius: 3 }}>
            <CardContent>
              <Typography variant="h6" gutterBottom>
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -54,3 +54,47 @@ export interface PaperlessSearchResponse {
  previous?: string | null;
  results: PaperlessDocument[];
 }
+
+export type AiReviewStatus =
+  | "pending"
+  | "analyzing"
+  | "needs_review"
+  | "approved"
+  | "rejected"
+  | "failed";
+
+export interface ContractAnalysisResult {
+  isContract: boolean;
+  title: string | null;
+  provider: string | null;
+  category: string | null;
+  contractStartDate: string | null;
+  contractEndDate: string | null;
+  terminationNoticeDays: number | null;
+  renewalPeriodMonths: number | null;
+  autoRenew: boolean;
+  price: number | null;
+  currency: string | null;
+  notes: string | null;
+  tags: string[];
+  summary: string;
+  confidence: number;
+}
+
+export interface AiReview {
+  id: number;
+  paperlessDocumentId: number;
+  status: AiReviewStatus;
+  documentTitle: string | null;
+  analysis: ContractAnalysisResult | null;
+  contractPayload: ContractPayload | null;
+  confidence: number | null;
+  error: string | null;
+  rawAiResponse: string | null;
+  contractId: number | null;
+  createdAt: string;
+  updatedAt: string;
+  analyzedAt: string | null;
+  approvedAt: string | null;
+  rejectedAt: string | null;
+}
--- a/src/aiProviders.ts
+++ b/src/aiProviders.ts
@@ -0,0 +1,296 @@
+import { z } from "zod";
+
+import { config } from "./config.js";
+import { createLogger } from "./logger.js";
+import type { RuntimeSettings } from "./runtimeSettings.js";
+import { ContractAnalysisResult } from "./types.js";
+
+const logger = createLogger(config.logLevel);
+
+type AiProvider = "openai" | "openai-compatible" | "gemini";
+
+export type AiDocumentInput = {
+  id: number;
+  title?: string | null;
+  correspondent?: string | null;
+  tags?: string[];
+  content?: string | null;
+  metadata?: Record<string, unknown> | null;
+};
+
+export type AiAnalysisResponse = {
+  analysis: ContractAnalysisResult;
+  rawResponse: string;
+};
+
+const analysisSchema = z.object({
+  isContract: z.boolean().default(false),
+  title: z.string().trim().min(1).nullable().default(null),
+  provider: z.string().trim().min(1).nullable().default(null),
+  category: z.string().trim().min(1).nullable().default(null),
+  contractStartDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).nullable().default(null),
+  contractEndDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).nullable().default(null),
+  terminationNoticeDays: z.number().int().nonnegative().nullable().default(null),
+  renewalPeriodMonths: z.number().int().nonnegative().nullable().default(null),
+  autoRenew: z.boolean().default(false),
+  price: z.number().nonnegative().nullable().default(null),
+  currency: z.string().trim().min(1).max(8).nullable().default("EUR"),
+  notes: z.string().trim().nullable().default(null),
+  tags: z.array(z.string().trim().min(1).max(100)).default([]),
+  summary: z.string().trim().min(1).default("No summary returned."),
+  confidence: z.number().min(0).max(1).default(0)
+});
+
+const analysisJsonSchema = {
+  type: "object",
+  additionalProperties: false,
+  required: [
+    "isContract",
+    "title",
+    "provider",
+    "category",
+    "contractStartDate",
+    "contractEndDate",
+    "terminationNoticeDays",
+    "renewalPeriodMonths",
+    "autoRenew",
+    "price",
+    "currency",
+    "notes",
+    "tags",
+    "summary",
+    "confidence"
+  ],
+  properties: {
+    isContract: { type: "boolean" },
+    title: { type: ["string", "null"] },
+    provider: { type: ["string", "null"] },
+    category: { type: ["string", "null"] },
+    contractStartDate: { type: ["string", "null"], pattern: "^\\d{4}-\\d{2}-\\d{2}$" },
+    contractEndDate: { type: ["string", "null"], pattern: "^\\d{4}-\\d{2}-\\d{2}$" },
+    terminationNoticeDays: { type: ["integer", "null"], minimum: 0 },
+    renewalPeriodMonths: { type: ["integer", "null"], minimum: 0 },
+    autoRenew: { type: "boolean" },
+    price: { type: ["number", "null"], minimum: 0 },
+    currency: { type: ["string", "null"] },
+    notes: { type: ["string", "null"] },
+    tags: { type: "array", items: { type: "string" } },
+    summary: { type: "string" },
+    confidence: { type: "number", minimum: 0, maximum: 1 }
+  }
+};
+
+const defaultPrompt = [
+  "Analyze the OCR text and metadata of a paperless-ngx document.",
+  "Decide whether it is a contract or a contract-related document.",
+  "Extract contract data only when it is explicitly present or strongly implied.",
+  "Use ISO dates in YYYY-MM-DD format. Use null for unknown values.",
+  "The confidence value must be between 0 and 1.",
+  "Return only JSON that matches the requested schema."
+].join(" ");
+
+function requireAiConfig(settings: RuntimeSettings): {
+  provider: AiProvider;
+  apiKey: string;
+  model: string;
+  baseUrl: string;
+  systemPrompt: string;
+  timeoutMs: number;
+  maxTokens: number;
+} {
+  if (!settings.aiEnabled) {
+    throw new Error("AI analysis is disabled.");
+  }
+  if (!settings.aiProvider || !settings.aiApiKey || !settings.aiModel) {
+    throw new Error("AI provider, model, and API key must be configured.");
+  }
+
+  const provider = settings.aiProvider;
+  const baseUrl =
+    settings.aiBaseUrl ??
+    (provider === "gemini"
+      ? "https://generativelanguage.googleapis.com/v1beta"
+      : "https://api.openai.com/v1");
+
+  return {
+    provider,
+    apiKey: settings.aiApiKey,
+    model: settings.aiModel,
+    baseUrl: baseUrl.replace(/\/+$/, ""),
+    systemPrompt: settings.aiSystemPrompt?.trim() || defaultPrompt,
+    timeoutMs: Math.max(settings.aiTimeoutSeconds, 5) * 1000,
+    maxTokens: settings.aiMaxTokens
+  };
+}
+
+function buildUserPrompt(document: AiDocumentInput): string {
+  const payload = {
+    paperlessDocumentId: document.id,
+    title: document.title ?? null,
+    correspondent: document.correspondent ?? null,
+    tags: document.tags ?? [],
+    metadata: document.metadata ?? {},
+    content: document.content?.slice(0, 60000) ?? ""
+  };
+  return `Extract contract metadata from this paperless-ngx document:\n${JSON.stringify(payload, null, 2)}`;
+}
+
+function withTimeout(timeoutMs: number): AbortSignal {
+  const controller = new AbortController();
+  setTimeout(() => controller.abort(), timeoutMs).unref?.();
+  return controller.signal;
+}
+
+function extractJson(text: string): unknown {
+  const trimmed = text.trim();
+  if (trimmed.startsWith("{")) {
+    return JSON.parse(trimmed);
+  }
+  const fenced = trimmed.match(/```(?:json)?\s*([\s\S]*?)```/i);
+  if (fenced) {
+    return JSON.parse(fenced[1].trim());
+  }
+  const first = trimmed.indexOf("{");
+  const last = trimmed.lastIndexOf("}");
+  if (first >= 0 && last > first) {
+    return JSON.parse(trimmed.slice(first, last + 1));
+  }
+  throw new Error("AI response did not contain JSON.");
+}
+
+function parseAnalysis(text: string): ContractAnalysisResult {
+  const parsed = analysisSchema.parse(extractJson(text));
+  return {
+    ...parsed,
+    title: parsed.title || null,
+    provider: parsed.provider || null,
+    category: parsed.category || null,
+    currency: parsed.currency || "EUR",
+    notes: parsed.notes || null,
+    tags: Array.from(new Set(parsed.tags.map((tag) => tag.trim()).filter(Boolean)))
+  };
+}
+
+async function requestOpenAiCompatible(
+  settings: ReturnType<typeof requireAiConfig>,
+  document: AiDocumentInput
+): Promise<AiAnalysisResponse> {
+  const response = await fetch(`${settings.baseUrl}/chat/completions`, {
+    method: "POST",
+    signal: withTimeout(settings.timeoutMs),
+    headers: {
+      Authorization: `Bearer ${settings.apiKey}`,
+      "Content-Type": "application/json",
+      Accept: "application/json"
+    },
+    body: JSON.stringify({
+      model: settings.model,
+      temperature: 0,
+      max_tokens: settings.maxTokens,
+      messages: [
+        { role: "system", content: settings.systemPrompt },
+        { role: "user", content: buildUserPrompt(document) }
+      ],
+      response_format: {
+        type: "json_schema",
+        json_schema: {
+          name: "contract_analysis",
+          strict: true,
+          schema: analysisJsonSchema
+        }
+      }
+    })
+  });
+
+  if (!response.ok) {
+    const text = await response.text();
+    throw new Error(`AI provider responded with ${response.status}: ${text}`);
+  }
+
+  const payload = await response.json() as {
+    choices?: Array<{ message?: { content?: string | Array<{ text?: string }> } }>;
+  };
+  const content = payload.choices?.[0]?.message?.content;
+  const raw = Array.isArray(content)
+    ? content.map((part) => part.text ?? "").join("")
+    : content;
+  if (!raw) {
+    throw new Error("AI provider returned an empty response.");
+  }
+
+  return { analysis: parseAnalysis(raw), rawResponse: raw };
+}
+
+async function requestGemini(
+  settings: ReturnType<typeof requireAiConfig>,
+  document: AiDocumentInput
+): Promise<AiAnalysisResponse> {
+  const url = new URL(`${settings.baseUrl}/models/${encodeURIComponent(settings.model)}:generateContent`);
+  url.searchParams.set("key", settings.apiKey);
+  const response = await fetch(url, {
+    method: "POST",
+    signal: withTimeout(settings.timeoutMs),
+    headers: {
+      "Content-Type": "application/json",
+      Accept: "application/json"
+    },
+    body: JSON.stringify({
+      systemInstruction: {
+        parts: [{ text: settings.systemPrompt }]
+      },
+      contents: [
+        {
+          role: "user",
+          parts: [{ text: buildUserPrompt(document) }]
+        }
+      ],
+      generationConfig: {
+        temperature: 0,
+        maxOutputTokens: settings.maxTokens,
+        responseMimeType: "application/json",
+        responseSchema: analysisJsonSchema
+      }
+    })
+  });
+
+  if (!response.ok) {
+    const text = await response.text();
+    throw new Error(`Gemini responded with ${response.status}: ${text}`);
+  }
+
+  const payload = await response.json() as {
+    candidates?: Array<{ content?: { parts?: Array<{ text?: string }> } }>;
+  };
+  const raw = payload.candidates?.[0]?.content?.parts?.map((part) => part.text ?? "").join("") ?? "";
+  if (!raw) {
+    throw new Error("Gemini returned an empty response.");
+  }
+
+  return { analysis: parseAnalysis(raw), rawResponse: raw };
+}
+
+export async function analyzeDocumentWithAi(
+  runtimeSettings: RuntimeSettings,
+  document: AiDocumentInput
+): Promise<AiAnalysisResponse> {
+  const aiSettings = requireAiConfig(runtimeSettings);
+  logger.info("Analyzing paperless document %s with AI provider %s", document.id, aiSettings.provider);
+
+  if (aiSettings.provider === "gemini") {
+    return requestGemini(aiSettings, document);
+  }
+
+  return requestOpenAiCompatible(aiSettings, document);
+}
+
+export async function testAiConfiguration(runtimeSettings: RuntimeSettings): Promise<void> {
+  await analyzeDocumentWithAi(runtimeSettings, {
+    id: 0,
+    title: "AI configuration test",
+    correspondent: "Example Provider",
+    tags: ["test"],
+    content:
+      "Example contract. Provider: Example Provider. Start: 2026-01-01. End: 2027-01-01. Cancellation notice: 30 days. Price: EUR 9.99 per month.",
+    metadata: {}
+  });
+}
--- a/src/aiReviewProcessor.ts
+++ b/src/aiReviewProcessor.ts
@@ -0,0 +1,161 @@
+import {
+  AiReview,
+  createAiReview,
+  getAiReview,
+  listAiReviews,
+  markAiReviewAnalyzing,
+  markAiReviewFailed,
+  saveAiReviewAnalysis
+} from "./aiReviewStore.js";
+import { analyzeDocumentWithAi } from "./aiProviders.js";
+import { createLogger } from "./logger.js";
+import { paperlessClient } from "./paperlessClient.js";
+import { getRuntimeSettings } from "./runtimeSettings.js";
+import { ContractAnalysisResult, ContractPayload } from "./types.js";
+import { config } from "./config.js";
+
+const logger = createLogger(config.logLevel);
+const processing = new Set<number>();
+
+function readString(value: unknown): string | null {
+  return typeof value === "string" && value.trim().length > 0 ? value.trim() : null;
+}
+
+function extractDocumentTitle(document: Record<string, unknown>, fallbackId: number): string {
+  return readString(document.title) ?? `Paperless document #${fallbackId}`;
+}
+
+function extractCorrespondent(document: Record<string, unknown>): string | null {
+  return (
+    readString(document.correspondent_name) ??
+    readString(document.correspondent__name) ??
+    (document.metadata && typeof document.metadata === "object"
+      ? readString((document.metadata as Record<string, unknown>).correspondent_name)
+      : null)
+  );
+}
+
+function extractTags(document: Record<string, unknown>): string[] {
+  const values: string[] = [];
+  const add = (value: unknown) => {
+    if (typeof value === "string" && value.trim()) {
+      values.push(value.trim());
+    } else if (value && typeof value === "object") {
+      const item = value as Record<string, unknown>;
+      const label = readString(item.name) ?? readString(item.slug) ?? readString(item.label);
+      if (label) {
+        values.push(label);
+      }
+    }
+  };
+
+  if (Array.isArray(document.tags__name)) {
+    document.tags__name.forEach(add);
+  }
+  if (Array.isArray(document.tag_names)) {
+    document.tag_names.forEach(add);
+  }
+  if (Array.isArray(document.tags)) {
+    document.tags.forEach(add);
+  }
+  if (document.metadata && typeof document.metadata === "object") {
+    const metadata = document.metadata as Record<string, unknown>;
+    if (Array.isArray(metadata.tag_names)) {
+      metadata.tag_names.forEach(add);
+    }
+  }
+
+  return Array.from(new Set(values));
+}
+
+function normalizeContractPayload(
+  documentId: number,
+  documentTitle: string,
+  analysis: ContractAnalysisResult
+): ContractPayload | null {
+  if (!analysis.isContract) {
+    return null;
+  }
+
+  return {
+    title: analysis.title ?? documentTitle,
+    paperlessDocumentId: documentId,
+    provider: analysis.provider,
+    category: analysis.category,
+    contractStartDate: analysis.contractStartDate,
+    contractEndDate: analysis.contractEndDate,
+    terminationNoticeDays: analysis.terminationNoticeDays,
+    renewalPeriodMonths: analysis.renewalPeriodMonths,
+    autoRenew: analysis.autoRenew,
+    price: analysis.price,
+    currency: analysis.currency ?? "EUR",
+    notes: analysis.notes ?? analysis.summary,
+    tags: analysis.tags
+  };
+}
+
+export function enqueuePaperlessDocumentAnalysis(documentId: number, documentTitle?: string | null): AiReview {
+  const review = createAiReview(documentId, documentTitle);
+  void processAiReview(review.id);
+  return review;
+}
+
+export async function processAiReview(reviewId: number): Promise<AiReview | null> {
+  if (processing.has(reviewId)) {
+    return getAiReview(reviewId);
+  }
+
+  processing.add(reviewId);
+  try {
+    const review = getAiReview(reviewId);
+    if (!review || review.status === "approved" || review.status === "rejected") {
+      return review;
+    }
+
+    markAiReviewAnalyzing(reviewId);
+    const runtime = getRuntimeSettings();
+
+    if (!paperlessClient.isConfigured) {
+      return markAiReviewFailed(reviewId, "Paperless integration is not configured.");
+    }
+
+    const document = await paperlessClient.getDocument(review.paperlessDocumentId);
+    if (!document) {
+      return markAiReviewFailed(reviewId, "Paperless document not found.");
+    }
+
+    const documentTitle = extractDocumentTitle(document, review.paperlessDocumentId);
+    const result = await analyzeDocumentWithAi(runtime, {
+      id: review.paperlessDocumentId,
+      title: documentTitle,
+      correspondent: extractCorrespondent(document),
+      tags: extractTags(document),
+      content: readString(document.content),
+      metadata: document.metadata && typeof document.metadata === "object"
+        ? document.metadata as Record<string, unknown>
+        : {}
+    });
+
+    return saveAiReviewAnalysis(reviewId, {
+      documentTitle,
+      analysis: result.analysis,
+      contractPayload: normalizeContractPayload(review.paperlessDocumentId, documentTitle, result.analysis),
+      rawAiResponse: result.rawResponse
+    });
+  } catch (error) {
+    logger.error("AI review processing failed", error);
+    return markAiReviewFailed(reviewId, error instanceof Error ? error.message : "AI analysis failed.");
+  } finally {
+    processing.delete(reviewId);
+  }
+}
+
+export function processPendingAiReviews(): void {
+  const candidates = [
+    ...listAiReviews("pending"),
+    ...listAiReviews("analyzing")
+  ];
+  for (const review of candidates) {
+    void processAiReview(review.id);
+  }
+}
--- a/src/aiReviewStore.ts
+++ b/src/aiReviewStore.ts
@@ -0,0 +1,226 @@
+import db, { AiReviewDbRow } from "./db.js";
+import { ContractAnalysisResult, ContractPayload } from "./types.js";
+
+export type AiReviewStatus =
+  | "pending"
+  | "analyzing"
+  | "needs_review"
+  | "approved"
+  | "rejected"
+  | "failed";
+
+export interface AiReview {
+  id: number;
+  paperlessDocumentId: number;
+  status: AiReviewStatus;
+  documentTitle: string | null;
+  analysis: ContractAnalysisResult | null;
+  contractPayload: ContractPayload | null;
+  confidence: number | null;
+  error: string | null;
+  rawAiResponse: string | null;
+  contractId: number | null;
+  createdAt: string;
+  updatedAt: string;
+  analyzedAt: string | null;
+  approvedAt: string | null;
+  rejectedAt: string | null;
+}
+
+function parseJson<T>(value: string | null): T | null {
+  if (!value) {
+    return null;
+  }
+  try {
+    return JSON.parse(value) as T;
+  } catch {
+    return null;
+  }
+}
+
+function stringifyJson(value: unknown): string | null {
+  if (value === undefined || value === null) {
+    return null;
+  }
+  return JSON.stringify(value);
+}
+
+function normalizeStatus(value: string): AiReviewStatus {
+  if (
+    value === "pending" ||
+    value === "analyzing" ||
+    value === "needs_review" ||
+    value === "approved" ||
+    value === "rejected" ||
+    value === "failed"
+  ) {
+    return value;
+  }
+  return "failed";
+}
+
+function mapRow(row: AiReviewDbRow): AiReview {
+  return {
+    id: row.id,
+    paperlessDocumentId: row.paperless_document_id,
+    status: normalizeStatus(row.status),
+    documentTitle: row.document_title,
+    analysis: parseJson<ContractAnalysisResult>(row.analysis_json),
+    contractPayload: parseJson<ContractPayload>(row.contract_payload_json),
+    confidence: row.confidence,
+    error: row.error,
+    rawAiResponse: row.raw_ai_response,
+    contractId: row.contract_id,
+    createdAt: row.created_at,
+    updatedAt: row.updated_at,
+    analyzedAt: row.analyzed_at,
+    approvedAt: row.approved_at,
+    rejectedAt: row.rejected_at
+  };
+}
+
+export function listAiReviews(status?: AiReviewStatus): AiReview[] {
+  const rows = status
+    ? db
+        .prepare<[string], AiReviewDbRow>(
+          `SELECT * FROM ai_review_queue WHERE status = ? ORDER BY updated_at DESC`
+        )
+        .all(status)
+    : db
+        .prepare<[], AiReviewDbRow>(
+          `SELECT * FROM ai_review_queue ORDER BY updated_at DESC LIMIT 200`
+        )
+        .all();
+  return rows.map(mapRow);
+}
+
+export function getAiReview(id: number): AiReview | null {
+  const row = db
+    .prepare<[number], AiReviewDbRow>(`SELECT * FROM ai_review_queue WHERE id = ?`)
+    .get(id);
+  return row ? mapRow(row) : null;
+}
+
+export function getAiReviewByDocumentId(documentId: number): AiReview | null {
+  const row = db
+    .prepare<[number], AiReviewDbRow>(`SELECT * FROM ai_review_queue WHERE paperless_document_id = ?`)
+    .get(documentId);
+  return row ? mapRow(row) : null;
+}
+
+export function createAiReview(documentId: number, documentTitle?: string | null): AiReview {
+  const existing = getAiReviewByDocumentId(documentId);
+  if (existing) {
+    return existing;
+  }
+
+  const now = new Date().toISOString();
+  const result = db
+    .prepare(
+      `INSERT INTO ai_review_queue (
+        paperless_document_id,
+        status,
+        document_title,
+        created_at,
+        updated_at
+      ) VALUES (?, 'pending', ?, ?, ?)`
+    )
+    .run(documentId, documentTitle ?? null, now, now);
+
+  return getAiReview(Number(result.lastInsertRowid))!;
+}
+
+export function markAiReviewAnalyzing(id: number): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET status = 'analyzing', error = NULL, updated_at = ?
+     WHERE id = ?`
+  ).run(now, id);
+  return getAiReview(id);
+}
+
+export function saveAiReviewAnalysis(
+  id: number,
+  data: {
+    documentTitle?: string | null;
+    analysis: ContractAnalysisResult;
+    contractPayload: ContractPayload | null;
+    rawAiResponse?: string | null;
+  }
+): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET status = 'needs_review',
+         document_title = COALESCE(?, document_title),
+         analysis_json = ?,
+         contract_payload_json = ?,
+         confidence = ?,
+         error = NULL,
+         raw_ai_response = ?,
+         analyzed_at = ?,
+         updated_at = ?
+     WHERE id = ?`
+  ).run(
+    data.documentTitle ?? null,
+    stringifyJson(data.analysis),
+    stringifyJson(data.contractPayload),
+    data.analysis.confidence,
+    data.rawAiResponse ?? null,
+    now,
+    now,
+    id
+  );
+  return getAiReview(id);
+}
+
+export function markAiReviewFailed(id: number, error: string): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET status = 'failed', error = ?, updated_at = ?
+     WHERE id = ?`
+  ).run(error, now, id);
+  return getAiReview(id);
+}
+
+export function resetAiReviewForRetry(id: number): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET status = 'pending', error = NULL, updated_at = ?
+     WHERE id = ? AND status IN ('failed', 'needs_review', 'pending')`
+  ).run(now, id);
+  return getAiReview(id);
+}
+
+export function rejectAiReview(id: number): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET status = 'rejected', rejected_at = ?, updated_at = ?
+     WHERE id = ?`
+  ).run(now, now, id);
+  return getAiReview(id);
+}
+
+export function setAiReviewContract(id: number, contractId: number): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET contract_id = ?, updated_at = ?
+     WHERE id = ?`
+  ).run(contractId, now, id);
+  return getAiReview(id);
+}
+
+export function approveAiReview(id: number, contractId: number): AiReview | null {
+  const now = new Date().toISOString();
+  db.prepare(
+    `UPDATE ai_review_queue
+     SET status = 'approved', contract_id = ?, approved_at = ?, error = NULL, updated_at = ?
+     WHERE id = ?`
+  ).run(contractId, now, now, id);
+  return getAiReview(id);
+}
--- a/src/config.ts
+++ b/src/config.ts
@@ -28,7 +28,16 @@ const configSchema = z.object({
  ntfyTopic: z.string().min(1).optional(),
  ntfyToken: z.string().optional(),
  ntfyPriority: z.string().optional(),
-  icalSecret: z.string().optional()
+  icalSecret: z.string().optional(),
+  aiEnabled: z.coerce.boolean().default(false),
+  aiProvider: z.enum(["openai", "openai-compatible", "gemini"]).optional(),
+  aiBaseUrl: z.string().url().optional(),
+  aiModel: z.string().min(1).optional(),
+  aiApiKey: z.string().min(1).optional(),
+  aiSystemPrompt: z.string().optional(),
+  aiTimeoutSeconds: z.coerce.number().min(5).max(300).default(60),
+  aiMaxTokens: z.coerce.number().min(256).max(16000).default(2000),
+  paperlessWebhookSecret: z.string().min(10).optional()
 });

 function parseBoolean(value: string | undefined, fallback: boolean): boolean {
@@ -72,7 +81,16 @@ const rawConfig = {
  ntfyTopic: readEnv("NTFY_TOPIC"),
  ntfyToken: readEnv("NTFY_TOKEN"),
  ntfyPriority: readEnv("NTFY_PRIORITY"),
-  icalSecret: readEnv("ICAL_SECRET")
+  icalSecret: readEnv("ICAL_SECRET"),
+  aiEnabled: parseBoolean(readEnv("AI_ENABLED"), false),
+  aiProvider: readEnv("AI_PROVIDER"),
+  aiBaseUrl: readEnv("AI_BASE_URL"),
+  aiModel: readEnv("AI_MODEL"),
+  aiApiKey: readEnv("AI_API_KEY"),
+  aiSystemPrompt: readEnv("AI_SYSTEM_PROMPT"),
+  aiTimeoutSeconds: readEnv("AI_TIMEOUT_SECONDS"),
+  aiMaxTokens: readEnv("AI_MAX_TOKENS"),
+  paperlessWebhookSecret: readEnv("PAPERLESS_WEBHOOK_SECRET")
 };

 export type AppConfig = z.infer<typeof configSchema>;
--- a/src/db.ts
+++ b/src/db.ts
@@ -50,6 +50,24 @@ CREATE TABLE IF NOT EXISTS categories (
  name TEXT NOT NULL UNIQUE COLLATE NOCASE,
  created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
 );
+
+CREATE TABLE IF NOT EXISTS ai_review_queue (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  paperless_document_id INTEGER NOT NULL UNIQUE,
+  status TEXT NOT NULL,
+  document_title TEXT,
+  analysis_json TEXT,
+  contract_payload_json TEXT,
+  confidence REAL,
+  error TEXT,
+  raw_ai_response TEXT,
+  contract_id INTEGER,
+  created_at TEXT NOT NULL,
+  updated_at TEXT NOT NULL,
+  analyzed_at TEXT,
+  approved_at TEXT,
+  rejected_at TEXT
+);
 `);


@@ -81,4 +99,22 @@ export type ContractDbRow = {
  updated_at: string;
 };

+export type AiReviewDbRow = {
+  id: number;
+  paperless_document_id: number;
+  status: string;
+  document_title: string | null;
+  analysis_json: string | null;
+  contract_payload_json: string | null;
+  confidence: number | null;
+  error: string | null;
+  raw_ai_response: string | null;
+  contract_id: number | null;
+  created_at: string;
+  updated_at: string;
+  analyzed_at: string | null;
+  approved_at: string | null;
+  rejected_at: string | null;
+};
+
 export default db;
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,24 @@
+import crypto from "node:crypto";
+
 import express, { NextFunction, Request, Response } from "express";
 import { z } from "zod";

+import {
+  approveAiReview,
+  getAiReview,
+  listAiReviews,
+  markAiReviewFailed,
+  rejectAiReview,
+  resetAiReviewForRetry,
+  setAiReviewContract
+} from "./aiReviewStore.js";
+import type { AiReviewStatus } from "./aiReviewStore.js";
+import {
+  enqueuePaperlessDocumentAnalysis,
+  processAiReview,
+  processPendingAiReviews
+} from "./aiReviewProcessor.js";
+import { testAiConfiguration } from "./aiProviders.js";
 import { config } from "./config.js";
 import {
  createContract,
@@ -89,7 +107,16 @@ const settingsUpdateSchema = z.object({
  ntfyPriority: z.string().nullable().optional(),
  authUsername: z.string().nullable().optional(),
  authPassword: z.string().nullable().optional(),
-  icalSecret: z.string().min(10).nullable().optional()
+  icalSecret: z.string().min(10).nullable().optional(),
+  aiEnabled: z.boolean().optional(),
+  aiProvider: z.enum(["openai", "openai-compatible", "gemini"]).nullable().optional(),
+  aiBaseUrl: z.string().url().nullable().optional(),
+  aiModel: z.string().nullable().optional(),
+  aiApiKey: z.string().min(1).nullable().optional(),
+  aiSystemPrompt: z.string().nullable().optional(),
+  aiTimeoutSeconds: z.coerce.number().min(5).max(300).optional(),
+  aiMaxTokens: z.coerce.number().min(256).max(16000).optional(),
+  paperlessWebhookSecret: z.string().min(10).nullable().optional()
 });

 const categorySchema = z.object({
@@ -114,13 +141,22 @@ function formatSettingsResponse(runtime: RuntimeSettings) {
      ntfyServerUrl: runtime.ntfyServerUrl,
      ntfyTopic: runtime.ntfyTopic,
      ntfyPriority: runtime.ntfyPriority ?? "default",
-      authUsername: runtime.authUsername
+      authUsername: runtime.authUsername,
+      aiEnabled: runtime.aiEnabled,
+      aiProvider: runtime.aiProvider,
+      aiBaseUrl: runtime.aiBaseUrl,
+      aiModel: runtime.aiModel,
+      aiSystemPrompt: runtime.aiSystemPrompt,
+      aiTimeoutSeconds: runtime.aiTimeoutSeconds,
+      aiMaxTokens: runtime.aiMaxTokens
    },
    secrets: {
      paperlessTokenSet: Boolean(runtime.paperlessToken),
      mailPasswordSet: Boolean(runtime.mailPassword),
      ntfyTokenSet: Boolean(runtime.ntfyToken),
-      authPasswordSet: Boolean(runtime.authPassword)
+      authPasswordSet: Boolean(runtime.authPassword),
+      aiApiKeySet: Boolean(runtime.aiApiKey),
+      paperlessWebhookSecretSet: Boolean(runtime.paperlessWebhookSecret)
    },
    icalSecret: runtime.icalSecret
  };
@@ -179,6 +215,50 @@ function buildIcsFeed(
  return lines.join("\r\n") + "\r\n";
 }

+function safeCompare(expected: string | null | undefined, provided: string | null | undefined): boolean {
+  if (!expected || !provided) {
+    return false;
+  }
+  const expectedBuffer = Buffer.from(expected);
+  const providedBuffer = Buffer.from(provided);
+  if (expectedBuffer.length !== providedBuffer.length) {
+    return false;
+  }
+  return crypto.timingSafeEqual(expectedBuffer, providedBuffer);
+}
+
+function extractWebhookDocumentId(body: unknown): number | null {
+  if (!body || typeof body !== "object") {
+    return null;
+  }
+  const payload = body as Record<string, unknown>;
+  const candidates = [
+    payload.document_id,
+    payload.documentId,
+    payload.id,
+    payload.document,
+    payload.document_pk
+  ];
+  for (const candidate of candidates) {
+    const value = typeof candidate === "string" ? Number(candidate) : candidate;
+    if (typeof value === "number" && Number.isInteger(value) && value > 0) {
+      return value;
+    }
+  }
+  return null;
+}
+
+function readWebhookSecret(req: Request): string | null {
+  const header =
+    req.get("x-contract-companion-secret") ??
+    req.get("x-paperless-webhook-secret") ??
+    req.get("authorization")?.replace(/^Bearer\s+/i, "");
+  if (header) {
+    return header;
+  }
+  return typeof req.query.secret === "string" ? req.query.secret : null;
+}
+
 app.get("/healthz", (_req, res) => {
  res.json({ status: "ok" });
 });
@@ -256,6 +336,30 @@ app.get("/calendar/feed.ics", (req, res) => {
  res.send(ics);
 });

+app.post("/integrations/paperless/webhook", (req, res) => {
+  const runtime = getRuntimeSettings();
+  if (!runtime.paperlessWebhookSecret) {
+    return res.status(503).json({ error: "Paperless webhook secret is not configured" });
+  }
+
+  const providedSecret = readWebhookSecret(req);
+  if (!safeCompare(runtime.paperlessWebhookSecret, providedSecret)) {
+    return res.status(401).json({ error: "Invalid webhook secret" });
+  }
+
+  const documentId = extractWebhookDocumentId(req.body);
+  if (!documentId) {
+    return res.status(400).json({ error: "Webhook payload does not contain a document id" });
+  }
+
+  const documentTitle =
+    req.body && typeof req.body === "object" && typeof (req.body as Record<string, unknown>).title === "string"
+      ? (req.body as Record<string, string>).title
+      : null;
+  const review = enqueuePaperlessDocumentAnalysis(documentId, documentTitle);
+  res.status(202).json({ status: review.status, reviewId: review.id, paperlessDocumentId: documentId });
+});
+
 app.use(authenticateRequest);

 app.get("/config", (_req, res) => {
@@ -263,6 +367,7 @@ app.get("/config", (_req, res) => {
  const paperlessConfigured = Boolean(runtime.paperlessBaseUrl && runtime.paperlessToken);
  const mailConfigured = Boolean(runtime.mailServer && runtime.mailFrom && runtime.mailTo);
  const ntfyConfigured = Boolean(runtime.ntfyServerUrl && runtime.ntfyTopic);
+  const aiConfigured = Boolean(runtime.aiEnabled && runtime.aiProvider && runtime.aiApiKey && runtime.aiModel);

  res.json({
    port: config.port,
@@ -281,7 +386,11 @@ app.get("/config", (_req, res) => {
    mailUseTls: runtime.mailUseTls,
    ntfyConfigured,
    authEnabled: isAuthEnabled(),
-    authTokenExpiresInHours: config.authTokenExpiresInHours
+    authTokenExpiresInHours: config.authTokenExpiresInHours,
+    aiEnabled: runtime.aiEnabled,
+    aiConfigured,
+    aiProvider: runtime.aiProvider,
+    paperlessWebhookConfigured: Boolean(runtime.paperlessWebhookSecret)
  });
 });

@@ -363,6 +472,33 @@ app.put("/settings", (req, res) => {
  if (Object.prototype.hasOwnProperty.call(payload, "icalSecret")) {
    update.icalSecret = payload.icalSecret ?? null;
  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiEnabled")) {
+    update.aiEnabled = payload.aiEnabled ?? false;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiProvider")) {
+    update.aiProvider = payload.aiProvider ?? null;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiBaseUrl")) {
+    update.aiBaseUrl = payload.aiBaseUrl ?? null;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiModel")) {
+    update.aiModel = payload.aiModel ?? null;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiApiKey")) {
+    update.aiApiKey = payload.aiApiKey ?? null;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiSystemPrompt")) {
+    update.aiSystemPrompt = payload.aiSystemPrompt ?? null;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiTimeoutSeconds")) {
+    update.aiTimeoutSeconds = payload.aiTimeoutSeconds;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "aiMaxTokens")) {
+    update.aiMaxTokens = payload.aiMaxTokens;
+  }
+  if (Object.prototype.hasOwnProperty.call(payload, "paperlessWebhookSecret")) {
+    update.paperlessWebhookSecret = payload.paperlessWebhookSecret ?? null;
+  }

  let runtime = updateRuntimeSettings(update);
  if (!runtime.icalSecret) {
@@ -406,6 +542,16 @@ app.post("/settings/test/ntfy", async (_req, res, next) => {
  }
 });

+app.post("/settings/test/ai", async (_req, res, next) => {
+  try {
+    const runtime = getRuntimeSettings();
+    await testAiConfiguration(runtime);
+    res.json({ status: "ok" });
+  } catch (error) {
+    next(error);
+  }
+});
+
 app.get("/integrations/paperless/search", async (req, res, next) => {
  const query = (typeof req.query.q === "string" ? req.query.q : typeof req.query.query === "string" ? req.query.query : "").trim();
  const page = Number(req.query.page ?? 1);
@@ -461,6 +607,96 @@ app.get("/integrations/paperless/documents/:documentId", async (req, res, next)
  }
 });

+app.get("/ai/reviews", (req, res) => {
+  const status = typeof req.query.status === "string" ? req.query.status : undefined;
+  const allowedStatuses: AiReviewStatus[] = ["pending", "analyzing", "needs_review", "approved", "rejected", "failed"];
+  if (status && !allowedStatuses.includes(status as AiReviewStatus)) {
+    return res.status(400).json({ error: "Invalid review status" });
+  }
+  res.json(listAiReviews(status as AiReviewStatus | undefined));
+});
+
+app.get("/ai/reviews/:id", (req, res) => {
+  const id = parseId(req.params.id);
+  if (!id) {
+    return res.status(400).json({ error: "Invalid review id" });
+  }
+  const review = getAiReview(id);
+  if (!review) {
+    return res.status(404).json({ error: "Review not found" });
+  }
+  res.json(review);
+});
+
+app.post("/ai/reviews/:id/retry", async (req, res, next) => {
+  const id = parseId(req.params.id);
+  if (!id) {
+    return res.status(400).json({ error: "Invalid review id" });
+  }
+  const review = resetAiReviewForRetry(id);
+  if (!review) {
+    return res.status(404).json({ error: "Review not found" });
+  }
+  try {
+    const updated = await processAiReview(id);
+    res.json(updated ?? review);
+  } catch (error) {
+    next(error);
+  }
+});
+
+app.post("/ai/reviews/:id/reject", (req, res) => {
+  const id = parseId(req.params.id);
+  if (!id) {
+    return res.status(400).json({ error: "Invalid review id" });
+  }
+  const review = rejectAiReview(id);
+  if (!review) {
+    return res.status(404).json({ error: "Review not found" });
+  }
+  res.json(review);
+});
+
+app.post("/ai/reviews/:id/approve", async (req, res, next) => {
+  const id = parseId(req.params.id);
+  if (!id) {
+    return res.status(400).json({ error: "Invalid review id" });
+  }
+
+  const review = getAiReview(id);
+  if (!review) {
+    return res.status(404).json({ error: "Review not found" });
+  }
+  if (review.status === "rejected") {
+    return res.status(400).json({ error: "Rejected reviews cannot be approved" });
+  }
+
+  const rawContract = req.body && typeof req.body === "object" && "contract" in req.body
+    ? (req.body as { contract?: unknown }).contract
+    : review.contractPayload;
+  if (!rawContract) {
+    return res.status(400).json({ error: "Review does not contain a contract draft" });
+  }
+
+  const payload = validatePayload(contractCreateSchema, rawContract) as ContractPayload;
+  try {
+    let contractId = review.contractId;
+    let contract = contractId ? getContract(contractId) : null;
+    if (!contract) {
+      contract = createContract({ ...payload, paperlessDocumentId: review.paperlessDocumentId });
+      contractId = contract.id;
+      setAiReviewContract(id, contract.id);
+    }
+
+    await paperlessClient.writeContractMetadata(review.paperlessDocumentId, contract.id, contract, review.analysis);
+    const approved = approveAiReview(id, contract.id);
+    res.json({ review: approved, contract });
+  } catch (error) {
+    markAiReviewFailed(id, error instanceof Error ? error.message : "Approval failed");
+    next(error);
+  }
+});
+
 app.get("/contracts", (req, res) => {
  const skip = Number(req.query.skip ?? 0);
  const limit = Math.min(Number(req.query.limit ?? 100), 500);
@@ -585,6 +821,7 @@ const server = app.listen(config.port, () => {
    logger.warn("Authentication is disabled; consider setting AUTH_USERNAME and AUTH_PASSWORD.");
  }
  deadlineMonitor.start();
+  processPendingAiReviews();
 });

 process.on("SIGTERM", () => {
--- a/src/paperlessClient.ts
+++ b/src/paperlessClient.ts
@@ -1,6 +1,7 @@
 import { config } from "./config.js";
 import { createLogger } from "./logger.js";
 import { getRuntimeSettings } from "./runtimeSettings.js";
+import { ContractAnalysisResult, ContractPayload } from "./types.js";

 const logger = createLogger(config.logLevel);

@@ -26,10 +27,13 @@ export class PaperlessClient {
    return `${trimmedBase}/${trimmedPath}`;
  }

-  private getHeaders(): HeadersInit {
+  private getHeaders(json = false): HeadersInit {
    const headers: Record<string, string> = {
      Accept: "application/json"
    };
+    if (json) {
+      headers["Content-Type"] = "application/json";
+    }
    const { paperlessToken } = getRuntimeSettings();
    if (paperlessToken) {
      headers.Authorization = `Token ${paperlessToken}`;
@@ -37,8 +41,8 @@ export class PaperlessClient {
    return headers;
  }

-  private async fetchJson<T>(url: URL): Promise<T> {
-    const response = await fetch(url, { headers: this.getHeaders() });
+  private async fetchJson<T>(url: URL, init: RequestInit = {}): Promise<T> {
+    const response = await fetch(url, { ...init, headers: init.headers ?? this.getHeaders() });
    if (!response.ok) {
      const text = await response.text();
      logger.error(`Paperless API error ${response.status}: ${text}`);
@@ -89,6 +93,138 @@ export class PaperlessClient {
    return payload;
  }

+  async ensureTag(name: string): Promise<number> {
+    if (!this.isConfigured) {
+      throw new Error("Paperless integration is not configured");
+    }
+    const normalized = name.trim();
+    if (!normalized) {
+      throw new Error("Tag name must not be empty");
+    }
+
+    const listUrl = new URL(this.buildUrl("/api/tags/"));
+    listUrl.searchParams.set("page_size", "100");
+    const payload = await this.fetchJson<PaperlessCollectionResponse<Record<string, unknown>>>(listUrl);
+    const existing = (payload.results ?? []).find(
+      (tag) => typeof tag.name === "string" && tag.name.toLowerCase() === normalized.toLowerCase()
+    );
+    if (typeof existing?.id === "number") {
+      return existing.id;
+    }
+
+    const createUrl = new URL(this.buildUrl("/api/tags/"));
+    const created = await this.fetchJson<Record<string, unknown>>(createUrl, {
+      method: "POST",
+      headers: this.getHeaders(true),
+      body: JSON.stringify({ name: normalized })
+    });
+    if (typeof created.id !== "number") {
+      throw new Error(`Paperless did not return an id for tag ${normalized}`);
+    }
+    return created.id;
+  }
+
+  async ensureCustomField(name: string, dataType: string): Promise<number> {
+    if (!this.isConfigured) {
+      throw new Error("Paperless integration is not configured");
+    }
+    const normalized = name.trim();
+    if (!normalized) {
+      throw new Error("Custom field name must not be empty");
+    }
+
+    const listUrl = new URL(this.buildUrl("/api/custom_fields/"));
+    listUrl.searchParams.set("page_size", "100");
+    const payload = await this.fetchJson<PaperlessCollectionResponse<Record<string, unknown>>>(listUrl);
+    const existing = (payload.results ?? []).find(
+      (field) => typeof field.name === "string" && field.name.toLowerCase() === normalized.toLowerCase()
+    );
+    if (typeof existing?.id === "number") {
+      return existing.id;
+    }
+
+    const createUrl = new URL(this.buildUrl("/api/custom_fields/"));
+    const created = await this.fetchJson<Record<string, unknown>>(createUrl, {
+      method: "POST",
+      headers: this.getHeaders(true),
+      body: JSON.stringify({ name: normalized, data_type: dataType })
+    });
+    if (typeof created.id !== "number") {
+      throw new Error(`Paperless did not return an id for custom field ${normalized}`);
+    }
+    return created.id;
+  }
+
+  async writeContractMetadata(
+    documentId: number,
+    contractId: number,
+    contract: ContractPayload,
+    analysis: ContractAnalysisResult | null
+  ): Promise<void> {
+    if (!this.isConfigured) {
+      throw new Error("Paperless integration is not configured");
+    }
+
+    const document = await this.getDocument(documentId);
+    if (!document) {
+      throw new Error("Document not found in paperless");
+    }
+
+    const tagIds = new Set<number>();
+    const existingTags = Array.isArray(document.tags) ? document.tags : [];
+    for (const tag of existingTags) {
+      if (typeof tag === "number") {
+        tagIds.add(tag);
+      } else if (tag && typeof tag === "object" && typeof (tag as Record<string, unknown>).id === "number") {
+        tagIds.add((tag as Record<string, number>).id);
+      }
+    }
+    tagIds.add(await this.ensureTag("contract"));
+    tagIds.add(await this.ensureTag("contract-ai-reviewed"));
+
+    const fieldValues: Record<string, string | number | boolean | null> = {};
+    const addField = async (name: string, dataType: string, value: string | number | boolean | null | undefined) => {
+      if (value === undefined || value === null || value === "") {
+        return;
+      }
+      const id = await this.ensureCustomField(name, dataType);
+      fieldValues[String(id)] = value;
+    };
+
+    await addField("Contract Companion ID", "integer", contractId);
+    await addField("Contract Title", "string", contract.title);
+    await addField("Contract Provider", "string", contract.provider ?? null);
+    await addField("Contract Category", "string", contract.category ?? null);
+    await addField("Contract Start Date", "date", contract.contractStartDate ?? null);
+    await addField("Contract End Date", "date", contract.contractEndDate ?? null);
+    await addField("Termination Notice Days", "integer", contract.terminationNoticeDays ?? null);
+    await addField("Renewal Period Months", "integer", contract.renewalPeriodMonths ?? null);
+    await addField("Auto Renewal", "boolean", contract.autoRenew ?? false);
+    await addField("Contract Price", "float", contract.price ?? null);
+    await addField("Contract Currency", "string", contract.currency ?? "EUR");
+    await addField("Contract Summary", "string", analysis?.summary ?? contract.notes ?? null);
+
+    const existingCustomFields = Array.isArray(document.custom_fields)
+      ? document.custom_fields as Array<Record<string, unknown>>
+      : [];
+    for (const item of existingCustomFields) {
+      const fieldId = typeof item.field === "number" ? item.field : typeof item.id === "number" ? item.id : null;
+      if (fieldId !== null && !Object.prototype.hasOwnProperty.call(fieldValues, String(fieldId))) {
+        fieldValues[String(fieldId)] = (item.value as string | number | boolean | null | undefined) ?? null;
+      }
+    }
+
+    const updateUrl = new URL(this.buildUrl(`/api/documents/${documentId}/`));
+    await this.fetchJson<Record<string, unknown>>(updateUrl, {
+      method: "PATCH",
+      headers: this.getHeaders(true),
+      body: JSON.stringify({
+        tags: Array.from(tagIds),
+        custom_fields: fieldValues
+      })
+    });
+  }
+
  async enrichDocuments(documents: PaperlessDocument[]): Promise<void> {
    if (!documents.length) return;

--- a/src/runtimeSettings.ts
+++ b/src/runtimeSettings.ts
@@ -31,10 +31,25 @@ export interface RuntimeSettings {
  authUsername: string | null;
  authPassword: string | null;
  icalSecret: string | null;
+  aiEnabled: boolean;
+  aiProvider: "openai" | "openai-compatible" | "gemini" | null;
+  aiBaseUrl: string | null;
+  aiModel: string | null;
+  aiApiKey: string | null;
+  aiSystemPrompt: string | null;
+  aiTimeoutSeconds: number;
+  aiMaxTokens: number;
+  paperlessWebhookSecret: string | null;
 }

-const numericKeys = new Set<SettingKey>(["schedulerIntervalMinutes", "alertDaysBefore", "mailPort"]);
-const booleanKeys = new Set<SettingKey>(["mailUseTls"]);
+const numericKeys = new Set<SettingKey>([
+  "schedulerIntervalMinutes",
+  "alertDaysBefore",
+  "mailPort",
+  "aiTimeoutSeconds",
+  "aiMaxTokens"
+]);
+const booleanKeys = new Set<SettingKey>(["mailUseTls", "aiEnabled"]);

 function coerceNumber(value: unknown, fallback: number): number {
  if (typeof value === "number" && Number.isFinite(value)) {
@@ -80,6 +95,13 @@ function normalizeLocale(value: unknown, fallback: string): string {
  return fallback;
 }

+function normalizeAiProvider(value: unknown, fallback: RuntimeSettings["aiProvider"]): RuntimeSettings["aiProvider"] {
+  if (value === "openai" || value === "openai-compatible" || value === "gemini") {
+    return value;
+  }
+  return fallback;
+}
+
 export function getRuntimeSettings(): RuntimeSettings {
  const stored = listSettings();

@@ -89,6 +111,12 @@ export function getRuntimeSettings(): RuntimeSettings {
  );
  const alertDaysBefore = coerceNumber(stored.alertDaysBefore, config.alertDaysBefore);
  const mailPort = stored.mailPort !== undefined ? coerceNumber(stored.mailPort, config.mailPort) : config.mailPort;
+  const aiTimeoutSeconds = stored.aiTimeoutSeconds !== undefined
+    ? coerceNumber(stored.aiTimeoutSeconds, config.aiTimeoutSeconds)
+    : config.aiTimeoutSeconds;
+  const aiMaxTokens = stored.aiMaxTokens !== undefined
+    ? coerceNumber(stored.aiMaxTokens, config.aiMaxTokens)
+    : config.aiMaxTokens;

  return {
    paperlessBaseUrl: coerceString(stored.paperlessBaseUrl, config.paperlessBaseUrl ?? null),
@@ -114,7 +142,19 @@ export function getRuntimeSettings(): RuntimeSettings {
    ntfyPriority: coerceString(stored.ntfyPriority, config.ntfyPriority ?? null),
    authUsername: coerceString(stored.authUsername, config.authUsername ?? null),
    authPassword: coerceString(stored.authPassword, config.authPassword ?? null),
-    icalSecret: coerceString(stored.icalSecret, config.icalSecret ?? null)
+    icalSecret: coerceString(stored.icalSecret, config.icalSecret ?? null),
+    aiEnabled:
+      stored.aiEnabled !== undefined
+        ? coerceBoolean(stored.aiEnabled, config.aiEnabled)
+        : config.aiEnabled,
+    aiProvider: normalizeAiProvider(stored.aiProvider, config.aiProvider ?? null),
+    aiBaseUrl: coerceString(stored.aiBaseUrl, config.aiBaseUrl ?? null),
+    aiModel: coerceString(stored.aiModel, config.aiModel ?? null),
+    aiApiKey: coerceString(stored.aiApiKey, config.aiApiKey ?? null),
+    aiSystemPrompt: coerceString(stored.aiSystemPrompt, config.aiSystemPrompt ?? null),
+    aiTimeoutSeconds,
+    aiMaxTokens,
+    paperlessWebhookSecret: coerceString(stored.paperlessWebhookSecret, config.paperlessWebhookSecret ?? null)
  };
 }

@@ -131,6 +171,14 @@ export function updateRuntimeSettings(update: Partial<RuntimeSettings>): Runtime
      value = normalizeLocale(value, config.appLocale);
    }

+    if (key === "aiProvider") {
+      value = normalizeAiProvider(value, null);
+      if (!value) {
+        removeSetting(key);
+        continue;
+      }
+    }
+
    if (numericKeys.has(key)) {
      const numericValue = coerceNumber(value, 0);
      setSetting(key, numericValue);
--- a/src/settingsStore.ts
+++ b/src/settingsStore.ts
@@ -28,7 +28,16 @@ export type SettingKey =
  | "ntfyPriority"
  | "authUsername"
  | "authPassword"
-  | "icalSecret";
+  | "icalSecret"
+  | "aiEnabled"
+  | "aiProvider"
+  | "aiBaseUrl"
+  | "aiModel"
+  | "aiApiKey"
+  | "aiSystemPrompt"
+  | "aiTimeoutSeconds"
+  | "aiMaxTokens"
+  | "paperlessWebhookSecret";

 export type StoredSettings = Partial<Record<SettingKey, unknown>>;

--- a/src/types.ts
+++ b/src/types.ts
@@ -14,6 +14,24 @@ export interface ContractPayload {
  tags?: string[];
 }

+export interface ContractAnalysisResult {
+  isContract: boolean;
+  title: string | null;
+  provider: string | null;
+  category: string | null;
+  contractStartDate: string | null;
+  contractEndDate: string | null;
+  terminationNoticeDays: number | null;
+  renewalPeriodMonths: number | null;
+  autoRenew: boolean;
+  price: number | null;
+  currency: string | null;
+  notes: string | null;
+  tags: string[];
+  summary: string;
+  confidence: number;
+}
+
 export interface Contract extends ContractPayload {
  id: number;
  createdAt: string;