diff --git a/README.md b/README.md
index 0196703..7e9f4a2 100644
--- a/README.md
+++ b/README.md
@@ -15,16 +15,23 @@ Live-Ziel: `https://mieterportal.hocks.eu`.
 
 **Anmeldung erforderlich** – Gruppen: **Verwaltung** und **Mieter** (Registrierung der Mieter per Code auf der Startseite).
 Demo-Zugänge (Passwort jeweils `0815`): `j.hinterstein` (Verwaltung) · `a.berger` (Mieterin) · Demo-Registrierungscode: `MP-2026-0815`.
-Alle Demo-Daten werden lokal im Browser (localStorage) gespeichert. Dark-Mode-Umschalter
-in der Seitenleiste bzw. Mobilen Kopfzeile.
+
+## Architektur (v1.3)
+
+- **Frontend:** React-SPA (statisch, nginx-Container `mp-portal`)
+- **API:** Node/Express (`server/`, Container `mp-api`) – Auth, Daten, Rollenrechte,
+  serverseitige E-Mail-Benachrichtigungen
+- **Datenbank:** PostgreSQL 16 (Container `mp-db`, Volume `mp_pgdata`) – zentrale
+  Datenhaltung für alle Nutzer, kein localStorage mehr (außer Dark-Mode-Theme)
+- Sitzung: HttpOnly-Cookie (8 h), Passwörter als SHA-256-Hash
 
 ## Entwicklung
 
 ```bash
 npm install
-npm run dev        # http://localhost:3000
+npm run dev        # http://localhost:3000 (proxyt /api an localhost:3001)
 npm run build      # Produktionsbuild nach dist/
-python beispieldaten.py   # generiert src/data/generated.json (Seed wählbar)
+python beispieldaten.py   # generiert server/seed/generated.json (Seed wählbar)
 ```
 
 Projekt-Kontext für Kimi Work: [kimi.md](kimi.md).
@@ -35,9 +42,13 @@ Projekt-Kontext für Kimi Work: [kimi.md](kimi.md).
 ./deploy.sh
 ```
 
-baut das Frontend, lädt das `dist/`-Paket per `pscp` auf den Server (Port 38592,
-Pageant-Key `Z:\Devel\ssh\priv_ionos_hocks_vps.ppk`) und startet den nginx-Container
-`mp-portal` neu. TLS/Subdomain liefert der Nginx Proxy Manager (npm_default-Netz).
+baut das Frontend, lädt Paket (dist + compose + nginx-Template + `server/`) per `pscp`
+auf den Server (Port 38592, Pageant-Key `Z:\Devel\ssh\priv_ionos_hocks_vps.ppk`) und
+startet den Stack neu inkl. API-Image-Build (`docker compose up -d --build`):
+`mp-portal` (nginx), `mp-api` (Node-API), `mp-db` (PostgreSQL). TLS/Subdomain liefert
+der Nginx Proxy Manager (npm_default-Netz). Voraussetzung auf dem Server:
+`portal.env` mit `MAIL_API_TOKEN` + `POSTGRES_PASSWORD` und `.env`-Symlink darauf
+(s. kimi.md Kap. 4).
 
 Alternativ lokal ohne Server: `docker build -t mieterportal . && docker run -p 8080:80 mieterportal`.
 
@@ -50,7 +61,7 @@ Alternativ lokal ohne Server: `docker build -t mieterportal . && docker run -p 8
 Auf dem Server läuft der Stack unter `/opt/mp-mail`. Das Portal ist verkabelt:
 Der nginx des `mp-portal`-Containers proxiet ausschließlich `POST /api/mail/send`
 an die Mail-API und authentifiziert sich dabei serverseitig mit dem Token aus
-`portal.env` (nur auf dem Server, gitignored). Das Frontend benachrichtigt die
+`portal.env` (nur auf dem Server, gitignored). Die **Node-API** benachrichtigt die
 Verwaltung bei neuen Schadensmeldungen und die jeweilige Gegenstelle bei
 Nachrichten – Versand fire-and-forget, ein Ausfall der Mail-API beeinträchtigt
 das Portal nicht.
diff --git a/beispieldaten.py b/beispieldaten.py
index 39e4262..994a0dc 100644
--- a/beispieldaten.py
+++ b/beispieldaten.py
@@ -2,15 +2,16 @@
 """Hocks Mieterportal – Beispieldaten-Generator.
 
 Erzeugt deterministisch die Demo-Daten des Portals und schreibt sie nach
-``src/data/generated.json`` (Units + Transaktionen). Die handschriftlichen
-Inhalte (Tickets, Dokumente, Nachrichten, Ankündigungen) liegen weiterhin in
-``src/data/seed.ts``.
+``server/seed/generated.json`` (Units + Transaktionen) – die Datenbank wird
+daraus beim ersten Start des mp-api-Containers gespeist. Die handschriftlichen
+Inhalte (Tickets, Dokumente, Nachrichten, Ankündigungen, Benutzer) liegen in
+``server/src/seed-data.js``.
 
 Aufruf:  python beispieldaten.py          (Standard-Seed 20261002)
          python beispieldaten.py 42      (eigener Seed zum Experimentieren)
 
 Achtung: Der Demo-Mieter „Anna Berger" (Whg. Hauptstraße 12 Nr. 7) und die
-Algorithmen sind synchron zu src/data/seed.ts zu halten.
+Algorithmen sind synchron zu server/src/seed-data.js zu halten.
 """
 
 import json
@@ -115,7 +116,7 @@ def main() -> None:
         "units": units,
         "transactions": gen_transactions(units),
     }
-    out = Path(__file__).parent / "src" / "data" / "generated.json"
+    out = Path(__file__).parent / "server" / "seed" / "generated.json"
     out.write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")
     print(f"{out} geschrieben: {data['meta']['units']} Wohnungen "
           f"({data['meta']['rented']} vermietet), {len(data['transactions'])} Buchungen")
diff --git a/deploy.sh b/deploy.sh
index ce47a08..f3ed373 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -1,10 +1,12 @@
 #!/usr/bin/env bash
-# Hocks Mieterportal – Deploy auf hocks.eu (Workflow aus dem Schulportal)
+# Hinterstein Mieterportal – Deploy auf hocks.eu (Workflow aus dem Schulportal)
 #
-# 1. npm run build   2. Paket (dist + compose + nginx) per pscp hochladen
-# 3. Entpacken nach /opt/mieterportal, Container mp-portal neu starten
+# 1. npm run build          2. Paket (dist + compose + nginx + server) hochladen
+# 3. Entpacken nach /opt/mieterportal, Container bauen & ersetzen
+# 4. Status prüfen (Container, Portal-Hash, API-Health)
 #
-# Voraussetzungen: Pageant mit priv_ionos_hocks_vps.ppk läuft.
+# Voraussetzungen: Pageant mit priv_ionos_hocks_vps.ppk läuft,
+# portal.env liegt auf dem Server (/opt/mieterportal/portal.env).
 # Aufruf: ./deploy.sh
 set -euo pipefail
 
@@ -24,23 +26,28 @@ rm -rf tmp-deploy && mkdir -p tmp-deploy/docker/templates
 cp -r dist tmp-deploy/dist
 cp docker-compose.yml tmp-deploy/
 cp docker/templates/default.conf.template tmp-deploy/docker/templates/
+cp -r server tmp-deploy/server
+rm -rf tmp-deploy/server/node_modules
 tar -czf mp-dist.tar.gz -C tmp-deploy .
 rm -rf tmp-deploy
 "$PSCP" -batch -hostkey "$HOSTKEY" -i "$KEY" -P "$PORT" \
   mp-dist.tar.gz "$SERVER":/tmp/mp-dist.tar.gz
 rm -f mp-dist.tar.gz
 
-echo "==> 3/4 Auf Server entpacken und Container ersetzen"
+echo "==> 3/4 Auf Server entpacken, API-Image bauen, Stack ersetzen"
 "$PLINK" -batch -hostkey "$HOSTKEY" -i "$KEY" -P "$PORT" "$SERVER" "
   mkdir -p $REMOTE_DIR &&
   tar -xzf /tmp/mp-dist.tar.gz -C $REMOTE_DIR &&
   rm -f /tmp/mp-dist.tar.gz &&
-  cd $REMOTE_DIR && docker compose up -d
+  cd $REMOTE_DIR && docker compose up -d --build
 "
 
 echo "==> 4/4 Status prüfen"
+sleep 5
 "$PLINK" -batch -hostkey "$HOSTKEY" -i "$KEY" -P "$PORT" "$SERVER" "
-  docker ps --filter name=mp-portal --format 'table {{.Names}}\t{{.Status}}' &&
-  curl -s https://mieterportal.hocks.eu/ | grep -o 'index-[^\"]*\.js' | head -1
+  docker ps --filter name=mp- --format 'table {{.Names}}\t{{.Status}}' &&
+  curl -s https://mieterportal.hocks.eu/ | grep -o 'index-[^\"]*\.js' | head -1 &&
+  curl -s https://mieterportal.hocks.eu/api/healthz
 "
+echo
 echo "Fertig: https://mieterportal.hocks.eu"
diff --git a/docker-compose.yml b/docker-compose.yml
index b263313..1f9b833 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,15 @@
-# Hocks Mieterportal – Portal-Container (statisches Frontend hinter NPM)
+# Hinterstein Mieterportal – Portal-Stack auf hocks.eu
 # TLS + Subdomain liefert der Nginx Proxy Manager (npm_default-Netz).
-# Deploy: ./deploy.sh baut dist/ lokal und lädt es auf den Server.
+# Deploy: ./deploy.sh baut dist/ + API-Image und lädt alles auf den Server.
+#
+# Dienste:
+#   mp-portal  nginx, statisches dist/ (SPA), proxiet /api/ → mp-api
+#              und POST /api/mail/send → mp-mail-api (Token aus portal.env)
+#   mp-api     Node-API (Express + PostgreSQL-Client), baut sich aus ./server
+#   mp-db      PostgreSQL 16 (persistiertes Volume mp_pgdata)
+#
+# portal.env (nur auf dem Server, gitignored) liefert:
+#   MAIL_API_TOKEN, POSTGRES_PASSWORD
 
 services:
   mp-portal:
@@ -13,9 +22,46 @@ services:
       - ./docker/templates/default.conf.template:/etc/nginx/templates/default.conf.template:ro
     env_file:
       - portal.env
+    depends_on:
+      - mp-api
+    networks:
+      - npm_default
+
+  mp-api:
+    build: ./server
+    container_name: mp-api
+    restart: unless-stopped
+    environment:
+      DATABASE_URL: postgres://mp:${POSTGRES_PASSWORD}@mp-db:5432/mieterportal
+      MAIL_API_URL: http://mp-mail-api:8080
+      MAIL_API_TOKEN: ${MAIL_API_TOKEN}
+      PORT: 3000
+    depends_on:
+      - mp-db
+    networks:
+      - npm_default
+
+  mp-db:
+    image: postgres:16-alpine
+    container_name: mp-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: mp
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_DB: mieterportal
+    volumes:
+      - mp_pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ['CMD-SHELL', 'pg_isready -U mp -d mieterportal']
+      interval: 10s
+      timeout: 5s
+      retries: 5
     networks:
       - npm_default
 
 networks:
   npm_default:
     external: true
+
+volumes:
+  mp_pgdata:
diff --git a/docker/templates/default.conf.template b/docker/templates/default.conf.template
index c2dffa9..a59e635 100644
--- a/docker/templates/default.conf.template
+++ b/docker/templates/default.conf.template
@@ -33,6 +33,16 @@ server {
         proxy_read_timeout 15s;
     }
 
+    # Portal-API (Node/Express + PostgreSQL): Auth, Daten, Benachrichtigungen.
+    location /api/ {
+        proxy_pass http://mp-api:3000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
+        client_max_body_size 256k;
+        proxy_read_timeout 30s;
+    }
+
     # SPA-Fallback für React Router
     location / {
         try_files $uri $uri/ /index.html;
diff --git a/kimi.md b/kimi.md
index 55a9eba..2ff9a56 100644
--- a/kimi.md
+++ b/kimi.md
@@ -1,6 +1,6 @@
 # Kimi-Kontext: Hinterstein Immobilien · Mieterportal (mieterportal.hocks.eu)
 
-> Projekt-Kontextdatei für Kimi Work. Stand: 02.10.2026, 14:30 Uhr.
+> Projekt-Kontextdatei für Kimi Work. Stand: 02.10.2026, 13:00 Uhr.
 > Bitte bei größeren Änderungen am Projekt aktualisieren.
 > Konventionen und Workflow sind am Projekt Schulportal (sfg.hocks.eu) orientiert.
 
@@ -10,15 +10,18 @@ Mieterportal der **Hinterstein Immobilien** (Demo, Inhaber Joseph Hinterstein) f
 **50 Wohnungen in 3 Häusern** (Hauptstraße 12 · Ringweg 3 · Am Park 5). Analog zum
 Schulportal: alle Mietangelegenheiten digital an einem Ort.
 
-**Authentifizierung (echtes Login seit v1.1):** Startseite `/login` mit
-Login-Pflicht (Route-Guard `RequireAuth` in `App.tsx` leitet unangemeldete Besucher
-auf `/login` um). **Gruppen:** `verwaltung` und `mieter`. Mieter können sich über
-einen **Registrierungscode** selbst registrieren (`/registrieren`); Codes legt die
-Verwaltung in der Benutzerverwaltung an (einmalig nutzbar, Wohnungsbezug).
-Passwörter als **SHA-256-Hash** in localStorage, Session 8 h
-(Key `mp_benutzer_session`). Demo-Zugänge (Passwort `0815`):
-`j.hinterstein` (Verwaltung, Joseph Hinterstein), `a.berger` (Mieterin,
-Hauptstraße 12 Whg. 7), `m.wolf` (Mieter). Demo-Registrierungscode: `MP-2026-0815`.
+**Datenhaltung (seit v1.3):** zentral serverseitig in **PostgreSQL** über eine
+**Node-API** (Express) – kein localStorage mehr für Mietdaten. Mehrere Nutzer
+sehen denselben Datenstand in Echtzeit; Rechte werden serverseitig erzwungen
+(Mieter nur eigene Wohnung, Verwaltung alles).
+
+**Authentifizierung:** Login-Pflicht auf `/login` (Route-Guard in `App.tsx`).
+Gruppen `verwaltung` und `mieter`; Mieter registrieren sich per einmaligem
+**Registrierungscode** (`/registrieren`). Passwörter als SHA-256-Hash (im Browser
+gerechnet, Vergleich serverseitig), Sitzung als HttpOnly-Cookie `mp_session`
+(8 h, Tabelle `sessions`). Demo-Zugänge (Passwort `0815`): `j.hinterstein`
+(Verwaltung), `a.berger` (Mieterin, Hauptstraße 12 Whg. 7), `m.wolf` (Mieter,
+Ringweg 3 Whg. 4). Demo-Registrierungscode: `MP-2026-0815`.
 
 **Die 6 Module:**
 
@@ -43,12 +46,14 @@ Hauptstraße 12 Whg. 7), `m.wolf` (Mieter). Demo-Registrierungscode: `MP-2026-08
 | Teil | Technologie |
 |---|---|
 | Frontend | React 18 + TypeScript, Vite 7, Tailwind v3.4 + shadcn/ui (Radix), React Router 7 (BrowserRouter), Recharts |
-| State | React Context + useReducer, Persistenz in localStorage (`hinterstein-mieterportal-v2`) |
-| Daten | `src/data/seed.ts` (handschriftlich) + `src/data/generated.json` (maschinell via `beispieldaten.py`) |
-| Auth | `src/lib/auth.ts` (SHA-256, Session 8 h, Keys `mp_benutzer`/`mp_benutzer_session`), Route-Guard in `App.tsx` |
+| State | Store-Kontext im Browser, **alle Daten serverseitig** (kein localStorage mehr); Ladezustand `bereit`, Schreibzugriff async |
+| API | `server/`: Node 20 + Express + pg, Session-Cookie, Rollenrechte, serverseitige Mail-Benachrichtigungen |
+| Datenbank | PostgreSQL 16 (`mp-db`), Schema/Seed in `server/src/db.js` + `seed.js`, Volume `mp_pgdata` |
+| Daten | `server/seed/generated.json` (50 Wohnungen + 552 Buchungen via `beispieldaten.py`) + `server/src/seed-data.js` (handschriftlich) |
+| Auth | SHA-256-Hash (Browser) + HttpOnly-Cookie-Session (8 h), `src/lib/api.ts`, `src/lib/auth.ts` |
 | Branding | Kunde: `src/assets/hinterstein/` (logo.png, joseph-hinterstein.jpg, kontakt.jpg); KI-generiert: `src/assets/logo.png`, `hero.jpg`, `modules.jpg` |
-| Webserver (Ziel) | Docker-Container `mp-portal` (nginx), statisches `dist/`, gemountet `/opt/mieterportal/dist` |
-| Mail | `mail-server/`: Postfix-Relay (`mp-mail`) + Python-API (`mp-mail-api`) – **live**, `/opt/mp-mail` auf dem Server; **verkabelt**: Portal-nginx proxyt `POST /api/mail/send` → `mp-mail-api:8080` und injiziert das Token aus `portal.env` (serverseitig, nie im Browser/Repo) |
+| Webserver | Docker-Container `mp-portal` (nginx), statisches `dist/`, proxiet `/api/` → `mp-api:3000` |
+| Mail | `mail-server/`: Postfix-Relay (`mp-mail`) + Python-API (`mp-mail-api`) – **live**, `/opt/mp-mail`; Portal-nginx proxyt `POST /api/mail/send` mit Token aus `portal.env` |
 | Server | Root-VPS hocks.eu (IONOS), Docker + Portainer, Subdomain via NPM (Nginx Proxy Manager, Let's Encrypt) |
 
 ## 3. Wichtige Dateien
@@ -59,23 +64,26 @@ ausgesperrt via `.gitignore` (`mail-server/mail.env` etc.).
 
 | Datei | Inhalt |
 |---|---|
-| `src/store/store.tsx` | Store-Provider, Reducer, Actions (setRole/addTicket/setTicketStatus/addMessage/newThread/markThreadRead), `fmtEUR` |
-| `src/data/seed.ts` | Tickets, Dokumente, Nachrichten-Threads, Ankündigungen + Re-Export units/transactions aus generated.json |
-| `src/data/generated.json` | 50 Wohnungen + 552 Buchungen, erzeugt von `beispieldaten.py` (Seed 20261002) |
-| `beispieldaten.py` | Deterministischer Generator: `python beispieldaten.py [seed]` |
-| `src/types/index.ts` | Alle Typen (Unit, Transaction, Ticket, DocumentItem, Thread, Announcement) |
-| `src/components/AppLayout.tsx` | Sidebar (Desktop) + Mobile Top-Bar/Nav, Rollenwechsel, Ungelesen-Badge, ThemeToggle |
+| `src/store/store.tsx` | Store-Kontext: lädt `/api/bootstrap`, stellt Collections + `me`/`role`/`meineEinheit` bereit, async-Methoden für alle Schreibaktionen, `fmtEUR` |
+| `src/lib/api.ts` | Fetch-Client (same-origin, JSON, `ApiFehler` mit deutscher Meldung) |
+| `src/lib/auth.ts` | SHA-256 für Passwörter, `DEMO_PASSWORT` |
+| `server/src/index.js` | Express-API: Auth (Login/Logout/me/Register), Bootstrap, Tickets, Threads/Messages, Benutzerverwaltung, Codes, `/api/healthz` |
+| `server/src/db.js` | pg-Pool + idempotentes Schema (11 Tabellen, snake_case) |
+| `server/src/seed.js` | Idempotenter Seed (läuft nur bei leerer users-Tabelle) |
+| `server/src/seed-data.js` | Handschriftliche Demo-Daten (Tickets, Dokumente, Threads, Ankündigungen, Benutzer, Codes) |
+| `server/src/mail.js` | Serverseitiger Versand über mp-mail-api (fire-and-forget) |
+| `server/seed/generated.json` | 50 Wohnungen + 552 Buchungen, erzeugt von `beispieldaten.py` (Seed 20261002) |
+| `beispieldaten.py` | Deterministischer Generator: `python beispieldaten.py [seed]` → `server/seed/generated.json` |
+| `src/types/index.ts` | Alle Typen (Unit, Transaction, Ticket, DocumentItem, Thread, Announcement, Benutzer, RegistrierungsCode) |
+| `src/components/AppLayout.tsx` | Sidebar (Desktop) + Mobile Top-Bar/Nav, Logout, Ungelesen-Badge, ThemeToggle |
 | `src/components/ThemeToggle.tsx` | Dark-Mode-Umschalter (Sonne/Mond) |
-| `src/lib/theme.ts` | `mp-theme` in localStorage, Init vor erstem Render (main.tsx) |
-| `src/pages/Login.tsx` | Login-Pflicht: Hero mit Joseph-Hinterstein-Portrait, Logo, Feature-Liste, Login-Formular + Registrierung-Link + Demo-Einstiege |
-| `src/lib/mail.ts` | E-Mail-Benachrichtigungen: `sendeBenachrichtigung` (fire-and-forget) an `/api/mail/send`, Empfänger-Auflösung (Verwaltung / Mieter je Wohnung) |
-| `docker/templates/default.conf.template` | nginx-Site als envsubst-Template; proxiet `POST /api/mail/send` → `mp-mail-api:8080` mit `${MAIL_API_TOKEN}` aus `portal.env` |
-| `src/pages/Benutzer.tsx` | Benutzerverwaltung (nur Verwaltung): Nutzer, Gruppen, Registrierungscodes |
-| `Dockerfile` | Optionaler All-in-One-Build (node build → nginx) für `docker build`-Workflow |
-| `docker/nginx.conf` | nginx-Site: SPA-Fallback, Gzip, Cache-Header für /assets/, Security-Header |
-| `docker-compose.yml` | `mp-portal` (nginx + gemountetes dist) im externen Netz `npm_default`; Mail-Stack separat |
-| `deploy.sh` | Bewährter Deploy-Workflow (s. Kap. 4) |
-| `mail-server/` | Postfix-Relay + schlanke Mail-API (Muster Schulportal, angepasst) |
+| `src/lib/theme.ts` | `mp-theme` in localStorage (nur noch Theme!), Init vor erstem Render (main.tsx) |
+| `src/pages/Login.tsx` | Login-Pflicht: Hero mit Joseph-Hinterstein-Portrait, Logo, Feature-Liste, Login + Registrierung + Demo-Einstiege |
+| `src/pages/BenutzerVerwaltung.tsx` | Benutzerverwaltung (nur Verwaltung): Nutzer anlegen/pflegen, Registrierungscodes erzeugen |
+| `docker/templates/default.conf.template` | nginx-Site als envsubst-Template: SPA, `/api/` → mp-api, `POST /api/mail/send` → mp-mail-api mit `${MAIL_API_TOKEN}` |
+| `docker-compose.yml` | Stack: `mp-portal` (nginx), `mp-api` (Node, Build ./server), `mp-db` (PostgreSQL 16, Volume mp_pgdata), Netz npm_default |
+| `deploy.sh` | Deploy-Workflow: Build, Paket (dist + compose + nginx + server), Upload, `docker compose up -d --build`, Health-Check |
+| `mail-server/` | Postfix-Relay + schlanke Mail-API (Muster Schulportal, angepasst) – separater Stack unter /opt/mp-mail |
 
 ## 4. Deploy-Workflow (bewährt, aus Schulportal übernommen)
 
@@ -103,10 +111,18 @@ tar -czf mp-dist.tar.gz -C dist .
 ```
 
 - SSH: Port **38592**, Key `Z:\Devel\ssh\priv_ionos_hocks_vps.ppk` (Pageant), Hostkey-Flag zwingend.
-- **`portal.env` auf dem Server wird vom compose als `env_file` gebraucht**
-  (liefert `MAIL_API_TOKEN` für den nginx-envsubst). Einmalig angelegt:
+- **`portal.env` auf dem Server** (gitignored, liegt nur dort): liefert
+  `MAIL_API_TOKEN` (für nginx-envsubst und mp-api) und `POSTGRES_PASSWORD`
+  (für mp-db und die DATABASE_URL des mp-api). Einmalig angelegt:
   `grep '^MAIL_API_TOKEN=' /opt/mp-mail/mail.env > /opt/mieterportal/portal.env`
-  Liegt nur auf dem Server (gitignored), wird von deploy.sh nicht hochgeladen.
+  plus zufälliges `POSTGRES_PASSWORD=…`. Wichtig: compose interpoliert
+  `${VARIABLE}` nur aus einer `.env`-Datei im Projektverzeichnis (nicht aus
+  `env_file:`!) – daher auf dem Server `/opt/mieterportal/.env` als
+  **Symlink auf portal.env**:
+  `cd /opt/mieterportal && ln -sf portal.env .env`
+- deploy.sh macht `docker compose up -d --build` (baut das mp-api-Image auf
+  dem Server, npm ci im Container) und prüft danach Container-Status,
+  Portal-Hash und `GET /api/healthz`.
 - **Vorsicht Fail2Ban:** zu viele gescheiterte SSH-Versuche von einer IP führen zu einem
   Ban (Timeout-Verbindungsbild). Ban aufheben auf dem Server: `fail2ban-client unban --all`.
 - **Live (seit 02.10.2026):** Container `mp-portal` läuft auf hocks.eu, statisches `dist/`
@@ -123,26 +139,25 @@ tar -czf mp-dist.tar.gz -C dist .
 ## 5. Zugänge & Konfiguration
 
 - **Demo-Zugänge (Passwort `0815`):** `j.hinterstein` (Verwaltung), `a.berger`
-  (Mieterin, Hauptstraße 12 Whg. 7), `m.wolf` (Mieter). Demo-Registrierungscode:
-  `MP-2026-0815`. Passwörter werden als SHA-256-Hash gespeichert; Store-Reset über
-  Browser-DevTools (localStorage-Keys `mp_benutzer`, `mp_benutzer_session`,
-  `hinterstein-mieterportal-v2` löschen).
+  (Mieterin, Hauptstraße 12 Whg. 7), `m.wolf` (Mieter, Ringweg 3 Whg. 4).
+  Demo-Registrierungscode: `MP-2026-0815`. Passwörter liegen als SHA-256-Hash
+  in der users-Tabelle; Sitzung als HttpOnly-Cookie (Tabelle sessions).
+  Abmelden reicht zum „Reset" – nichts liegt mehr im Browser-localStorage
+  (außer dem Dark-Mode-Theme).
+- **Verwaltungs-E-Mail:** `axel@hocks.eu` (echtes, zustellbares Postfach, damit
+  Benachrichtigungen ankommen) – im Portal änderbar.
 - **Mail-API-Token:** bewusst nicht hier dokumentiert – liegt auf dem Server in
   `/opt/mp-mail/mail.env` (Vorlage `mail.env.example` im Repo).
 - **Mail-Stack live (seit 02.10.2026):** Container `mp-mail` + `mp-mail-api` laufen
   auf hocks.eu unter `/opt/mp-mail` (Relay über `hocks-eu.mail.protection.outlook.com`).
   Testmail und API-`/send` (mit `X-Api-Token`) verifiziert (status=sent); ohne Token 401.
-- **Mail-Benachrichtigungen im Portal (seit 02.10., v1.2):** Der Portal-nginx
-  (`docker/templates/default.conf.template`, envsubst) proxiet ausschließlich
-  `POST /api/mail/send` an `http://mp-mail-api:8080/send` und setzt das Token
-  aus `/opt/mieterportal/portal.env` (chmod 600, **nicht im Repo**, gitignored).
-  Das Frontend (`src/lib/mail.ts`) sendet fire-and-forget: neue Schadensmeldung →
-  alle aktiven Verwaltungsbenutzer, neue Nachricht/Antwort → Gegenstelle
-  (Mieter ↔ Verwaltung, Empfänger über Wohnungsbezug). E2E verifiziert:
-  POST über `https://mieterportal.hocks.eu/api/mail/send` → `versandt: true`
-  (Test an axel@hocks.eu); GET wird mit 403 blockiert. Demo-Empfängeradressen
-  (z. B. joseph@hinterstein-immo.de) sind fiktiv → dort kein Empfang möglich,
-  echte Adressen in der Benutzerverwaltung pflegen.
+- **Mail-Benachrichtigungen (seit v1.2 nginx-Proxy, seit v1.3 serverseitig):** Der
+  Portal-nginx proxiet `POST /api/mail/send` an `http://mp-mail-api:8080/send` mit
+  Token aus `portal.env` (403 für alles außer POST). **Versand aus der Node-API**
+  (`server/src/mail.js`, fire-and-forget): neue Schadensmeldung → alle aktiven
+  Verwaltungsbenutzer, neue Nachricht/Antwort → Gegenstelle (Mieter ↔ Verwaltung,
+  Auflösung über Wohnungsbezug). E2E verifiziert: Zustellung an axel@hocks.eu
+  mit Postfix status=sent (02.10., 10:42 Uhr).
 
 ## 6. Konventionen & Besonderheiten
 
@@ -160,8 +175,12 @@ tar -czf mp-dist.tar.gz -C dist .
 ## 7. Testing
 
 - `npm run build` (`tsc -b`) ist die echte Typprüfung; `npx tsc --noEmit` prüft wegen
-  Solution-tsconfig ggf. nichts.
-- Headless-Screenshots (Dark Mode = Systempräferenz):
+  Solution-tsconfig ggf. nichts. Server-Syntax: `node --check server/src/*.js`.
+- API-Livetests mit curl (Cookie-Jar): Login → `/api/auth/me` → `/api/bootstrap`
+  (Mieter-Sicht zählt kleiner!) → Ticket/Thread schreiben → Postfix-Log auf
+  Zustellung prüfen (`docker logs mp-mail | grep to=<empfaenger>`).
+- Headless-Screenshots (Dark Mode = Systempräferenz, `--virtual-time-budget=10000`
+  wartet auf den Session-Check):
   `"/c/Program Files/Google/Chrome/Application/chrome.exe" --headless --disable-gpu --screenshot=... --window-size=WxH "URL"`
 - Screenshots ausgeliefert nach `preview/`.
 
@@ -196,12 +215,28 @@ angeschlossen: nginx-Proxy `/api/mail/send` mit serverseitig injiziertem Token
 neuen Schadensmeldungen (→ Verwaltung) und Nachrichten/Antworten (→ Gegenstelle).
 E2E-Versand live verifiziert (versandt: true), GET auf den Endpunkt 403.
 
+**Erledigt 02.10. (v1.3 live):** Serverseitige Datenbank: PostgreSQL 16 (`mp-db`,
+Volume `mp_pgdata`) + Node-API (`mp-api`, Express + pg, eigenes Image via
+deploy.sh `--build`). Schema 11 Tabellen (idempotent), Seed einmalig aus
+`server/seed/generated.json` + `seed-data.js` (Verwaltungs-E-Mail auf echtes
+Postfach axel@hocks.eu gesetzt). Frontend komplett auf API umgestellt:
+`src/lib/api.ts`, Store lädt `/api/bootstrap`, kein localStorage mehr (außer
+Theme), Ladebildschirm während Session-Check. Rollenrechte serverseitig
+durchgesetzt und getestet (Mieterin sieht nur hs-7: 12 Buchungen/2 Tickets,
+403 auf fremde Unterhaltung; Verwaltung sieht alles: 552 Buchungen/8 Tickets).
+Registrierung, Code-Erzeugung, Ticket inkl. Mail-Benachrichtigung (status=sent
+an axel@hocks.eu) E2E verifiziert; Testdaten danach bereinigt. deploy.sh baut
+das API-Image auf dem Server; `.env`-Symlink auf portal.env für
+Compose-Interpolation beachten (POSTGRES_PASSWORD!).
+
 **Offen:**
 - Zertifikatserneuerung prüfen (per 01.12.2026): NPM-Renewer sollte cert 9 über HTTP-Challenge
   erneuern; sonst certbot/webroot + Kopie nach npm-9 wiederholen.
-- Demo-Empfängeradressen durch echte ersetzen, sobald bekannt.
-- Mögliche nächste Schritte: serverseitige Datenbank (PostgreSQL/Node-API) statt localStorage,
-  Mehrseitigkeit für 50 echte Mietverhältnisse.
+- Demo-Empfängeradressen der Mieter (example.de) durch echte ersetzen, sobald bekannt.
+- Sicherheit für Produktion: Passwort-Hash serverseitig salten (bcrypt/argon2), CSRF-Token,
+  Rate-Limiting auf /api/auth/login.
+- Mögliche nächste Schritte: Datenbank-Backup-Job (nächtlicher pg_dump), E-Mail-Verifizierung
+  bei Registrierung, dokumenten-Download mit echten Dateien.
 
 ## 9. Sonstiges
 
diff --git a/preview/07-live-api.png b/preview/07-live-api.png
new file mode 100644
index 0000000..e1b52bd
Binary files /dev/null and b/preview/07-live-api.png differ
diff --git a/server/Dockerfile b/server/Dockerfile
new file mode 100644
index 0000000..04849e0
--- /dev/null
+++ b/server/Dockerfile
@@ -0,0 +1,20 @@
+# Hinterstein Mieterportal – API-Container (Node + PostgreSQL-Client)
+# Build:  docker compose build mp-api
+# Die Datenbank läuft als eigener Service (mp-db) im selben Compose-Projekt.
+
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN npm ci --omit=dev --no-audit --no-fund
+
+FROM node:20-alpine
+ENV NODE_ENV=production
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY package.json ./
+COPY src ./src
+COPY seed ./seed
+EXPOSE 3000
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s \
+  CMD wget -qO- http://localhost:3000/api/healthz >/dev/null 2>&1 || exit 1
+CMD ["node", "src/index.js"]
diff --git a/server/package-lock.json b/server/package-lock.json
new file mode 100644
index 0000000..b9ae3bc
--- /dev/null
+++ b/server/package-lock.json
@@ -0,0 +1,982 @@
+{
+  "name": "mieterportal-api",
+  "version": "1.3.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "mieterportal-api",
+      "version": "1.3.0",
+      "dependencies": {
+        "express": "^4.21.2",
+        "pg": "^8.13.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+      "license": "MIT"
+    },
+    "node_modules/body-parser": {
+      "version": "1.20.8",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.8.tgz",
+      "integrity": "sha512-JNcyFQ64OiijEkPzUBTCe+hyPXUD/3LEldGQ6iF5LR1w00mx9o7xtDWHXBY2iItjdCFGoilOLNQbH943ut7pHA==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "~3.1.2",
+        "content-type": "~1.0.5",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "~1.2.0",
+        "http-errors": "~2.0.1",
+        "iconv-lite": "~0.4.24",
+        "on-finished": "~2.4.1",
+        "qs": "~6.16.0",
+        "raw-body": "~2.5.3",
+        "type-is": "~1.6.18",
+        "unpipe": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
+    "node_modules/bytes": {
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+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
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+      "license": "MIT",
+      "engines": {
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+      }
+    },
+    "node_modules/call-bind-apply-helpers": {
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+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/call-bound": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "get-intrinsic": "^1.3.0"
+      },
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+      },
+      "funding": {
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+      }
+    },
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diff --git a/server/package.json b/server/package.json
new file mode 100644
index 0000000..fe3ec81
--- /dev/null
+++ b/server/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "mieterportal-api",
+  "version": "1.3.0",
+  "private": true,
+  "description": "Node-API + PostgreSQL für das Hinterstein Mieterportal",
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+  },
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+}
diff --git a/server/seed/generated.json b/server/seed/generated.json
new file mode 100644
index 0000000..91edd0e
--- /dev/null
+++ b/server/seed/generated.json
@@ -0,0 +1,6452 @@
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+    },
+    {
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+    },
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+    },
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+    },
+    {
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
+    {
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+    },
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+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "06.06.2026"
+    },
+    {
+      "id": "tx-ap-14-6",
+      "unitId": "ap-14",
+      "tenant": "Jan Sander",
+      "month": "Juli",
+      "year": 2026,
+      "amount": 820,
+      "type": "Miete",
+      "status": "überfällig"
+    },
+    {
+      "id": "tx-ap-14-7",
+      "unitId": "ap-14",
+      "tenant": "Jan Sander",
+      "month": "August",
+      "year": 2026,
+      "amount": 820,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "08.08.2026"
+    },
+    {
+      "id": "tx-ap-14-8",
+      "unitId": "ap-14",
+      "tenant": "Jan Sander",
+      "month": "September",
+      "year": 2026,
+      "amount": 820,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "01.09.2026"
+    },
+    {
+      "id": "tx-ap-14-9",
+      "unitId": "ap-14",
+      "tenant": "Jan Sander",
+      "month": "Oktober",
+      "year": 2026,
+      "amount": 820,
+      "type": "Miete",
+      "status": "offen"
+    },
+    {
+      "id": "tx-ap-14-10",
+      "unitId": "ap-14",
+      "tenant": "Jan Sander",
+      "month": "November",
+      "year": 2026,
+      "amount": 820,
+      "type": "Miete",
+      "status": "offen"
+    },
+    {
+      "id": "tx-ap-14-11",
+      "unitId": "ap-14",
+      "tenant": "Jan Sander",
+      "month": "Dezember",
+      "year": 2026,
+      "amount": 820,
+      "type": "Miete",
+      "status": "offen"
+    },
+    {
+      "id": "tx-ap-15-0",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Januar",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "01.01.2026"
+    },
+    {
+      "id": "tx-ap-15-1",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Februar",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "02.02.2026"
+    },
+    {
+      "id": "tx-ap-15-2",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "März",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "03.03.2026"
+    },
+    {
+      "id": "tx-ap-15-3",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "April",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "04.04.2026"
+    },
+    {
+      "id": "tx-ap-15-4",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Mai",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "05.05.2026"
+    },
+    {
+      "id": "tx-ap-15-5",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Juni",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "06.06.2026"
+    },
+    {
+      "id": "tx-ap-15-6",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Juli",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "überfällig"
+    },
+    {
+      "id": "tx-ap-15-7",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "August",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "08.08.2026"
+    },
+    {
+      "id": "tx-ap-15-8",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "September",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "bezahlt",
+      "paidAt": "01.09.2026"
+    },
+    {
+      "id": "tx-ap-15-9",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Oktober",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "offen"
+    },
+    {
+      "id": "tx-ap-15-10",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "November",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "offen"
+    },
+    {
+      "id": "tx-ap-15-11",
+      "unitId": "ap-15",
+      "tenant": "Mia Lindner",
+      "month": "Dezember",
+      "year": 2026,
+      "amount": 943,
+      "type": "Miete",
+      "status": "offen"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/server/src/db.js b/server/src/db.js
new file mode 100644
index 0000000..6b8f45a
--- /dev/null
+++ b/server/src/db.js
@@ -0,0 +1,129 @@
+/** PostgreSQL-Verbindung + Schema für das Mieterportal.
+ *
+ * Tabellen werden beim Start idempotent angelegt (CREATE TABLE IF NOT EXISTS),
+ * danach lädt seed.js die Demo-Daten, falls die Datenbank leer ist.
+ */
+
+const { Pool } = require('pg')
+
+const pool = new Pool({
+  connectionString:
+    process.env.DATABASE_URL || 'postgres://mp:mp@localhost:5432/mieterportal',
+  max: 10,
+})
+
+const SCHEMA = `
+CREATE TABLE IF NOT EXISTS units (
+  id         TEXT PRIMARY KEY,
+  building   TEXT NOT NULL,
+  number     TEXT NOT NULL,
+  floor      INT  NOT NULL,
+  size       NUMERIC(8,2) NOT NULL,
+  cold_rent  NUMERIC(10,2) NOT NULL,
+  warm_rent  NUMERIC(10,2) NOT NULL,
+  tenant     TEXT,
+  status     TEXT NOT NULL CHECK (status IN ('vermietet','frei'))
+);
+
+CREATE TABLE IF NOT EXISTS transactions (
+  id       TEXT PRIMARY KEY,
+  unit_id  TEXT NOT NULL REFERENCES units(id),
+  tenant   TEXT NOT NULL,
+  month    TEXT NOT NULL,
+  year     INT  NOT NULL,
+  amount   NUMERIC(10,2) NOT NULL,
+  type     TEXT NOT NULL,
+  status   TEXT NOT NULL CHECK (status IN ('bezahlt','offen','überfällig')),
+  paid_at  TEXT
+);
+CREATE INDEX IF NOT EXISTS idx_transactions_unit ON transactions(unit_id);
+
+CREATE TABLE IF NOT EXISTS tickets (
+  id          TEXT PRIMARY KEY,
+  unit_id     TEXT NOT NULL REFERENCES units(id),
+  tenant      TEXT NOT NULL,
+  title       TEXT NOT NULL,
+  description TEXT NOT NULL DEFAULT '',
+  category    TEXT NOT NULL,
+  priority    TEXT NOT NULL CHECK (priority IN ('niedrig','mittel','hoch')),
+  status      TEXT NOT NULL DEFAULT 'offen'
+              CHECK (status IN ('offen','in Bearbeitung','erledigt')),
+  created_at  TEXT NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_tickets_unit ON tickets(unit_id);
+
+CREATE TABLE IF NOT EXISTS documents (
+  id       TEXT PRIMARY KEY,
+  unit_id  TEXT REFERENCES units(id),  -- NULL = Hausdokument für alle
+  title    TEXT NOT NULL,
+  category TEXT NOT NULL,
+  size     TEXT NOT NULL,
+  date     TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS threads (
+  id               TEXT PRIMARY KEY,
+  unit_id          TEXT NOT NULL REFERENCES units(id),
+  tenant           TEXT NOT NULL,
+  subject          TEXT NOT NULL,
+  unread_by_admin  BOOLEAN NOT NULL DEFAULT FALSE,
+  unread_by_tenant BOOLEAN NOT NULL DEFAULT FALSE
+);
+CREATE INDEX IF NOT EXISTS idx_threads_unit ON threads(unit_id);
+
+CREATE TABLE IF NOT EXISTS messages (
+  id        TEXT PRIMARY KEY,
+  thread_id TEXT NOT NULL REFERENCES threads(id) ON DELETE CASCADE,
+  from_role TEXT NOT NULL CHECK (from_role IN ('tenant','admin')),
+  author    TEXT NOT NULL,
+  text      TEXT NOT NULL,
+  at        TEXT NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_messages_thread ON messages(thread_id);
+
+CREATE TABLE IF NOT EXISTS announcements (
+  id    TEXT PRIMARY KEY,
+  title TEXT NOT NULL,
+  text  TEXT NOT NULL,
+  date  TEXT NOT NULL,
+  tag   TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS users (
+  id            TEXT PRIMARY KEY,
+  benutzername  TEXT NOT NULL UNIQUE,
+  name          TEXT NOT NULL,
+  passwort_hash TEXT NOT NULL,
+  rolle         TEXT NOT NULL CHECK (rolle IN ('verwaltung','mieter')),
+  email         TEXT NOT NULL,
+  einheit_id    TEXT REFERENCES units(id),
+  aktiv         BOOLEAN NOT NULL DEFAULT TRUE,
+  erstellt_am   TEXT NOT NULL,
+  letzter_login TEXT
+);
+
+CREATE TABLE IF NOT EXISTS registration_codes (
+  code        TEXT PRIMARY KEY,
+  einheit_id  TEXT REFERENCES units(id),
+  erstellt_am TEXT NOT NULL,
+  verwendet_am TEXT
+);
+
+CREATE TABLE IF NOT EXISTS sessions (
+  token      TEXT PRIMARY KEY,
+  user_id    TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  expires    TIMESTAMPTZ NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_sessions_user ON sessions(user_id);
+`
+
+async function init() {
+  await pool.query(SCHEMA)
+}
+
+/** Aufräumen abgelaufener Sessions (gelegentlich aufgerufen). */
+async function sessionsAufraeumen() {
+  await pool.query('DELETE FROM sessions WHERE expires < now()')
+}
+
+module.exports = { pool, init, sessionsAufraeumen }
diff --git a/server/src/index.js b/server/src/index.js
new file mode 100644
index 0000000..002bd9e
--- /dev/null
+++ b/server/src/index.js
@@ -0,0 +1,474 @@
+/** Hinterstein Mieterportal – Node-API (Express + PostgreSQL).
+ *
+ * Authentifizierung: Session-Cookie mp_session (HttpOnly, 8 h), Passwörter als
+ * SHA-256-Hash (wie bisher im Browser berechnet, Vergleich serverseitig).
+ * Rollenrechte: Mieter sehen nur Daten ihrer Wohnung, Verwaltung alles.
+ * Benachrichtigungen (Ticket/Nachricht) werden serverseitig per Mail verschickt.
+ */
+
+const express = require('express')
+const crypto = require('crypto')
+const { pool, init, sessionsAufraeumen } = require('./db')
+const { seed } = require('./seed')
+const mail = require('./mail')
+
+const PORT = Number(process.env.PORT || 3000)
+const SESSION_DAUER_MS = 8 * 60 * 60 * 1000
+const COOKIE_NAME = 'mp_session'
+
+const app = express()
+app.use(express.json({ limit: '256kb' }))
+app.set('trust proxy', true)
+
+// ── Cookie-Helfer (bewusst ohne Dependency) ──────────────────
+function cookieLesen(req, name) {
+  const raw = req.headers.cookie || ''
+  for (const teil of raw.split(';')) {
+    const i = teil.indexOf('=')
+    if (i > -1 && teil.slice(0, i).trim() === name) return decodeURIComponent(teil.slice(i + 1).trim())
+  }
+  return null
+}
+
+function cookieSetzen(res, token, maxAgeMs, secure) {
+  res.append(
+    'Set-Cookie',
+    `${COOKIE_NAME}=${encodeURIComponent(token)}; Path=/; HttpOnly; SameSite=Lax; ` +
+      `Max-Age=${Math.floor(maxAgeMs / 1000)}${secure ? '; Secure' : ''}`,
+  )
+}
+
+// ── Auth-Middleware ──────────────────────────────────────────
+async function auth(req, res, next) {
+  try {
+    const token = cookieLesen(req, COOKIE_NAME)
+    if (token) {
+      const { rows } = await pool.query(
+        `SELECT u.* FROM sessions s JOIN users u ON u.id = s.user_id
+         WHERE s.token = $1 AND s.expires > now() AND u.aktiv`,
+        [token],
+      )
+      if (rows.length) {
+        req.user = rows[0]
+        req.sessionToken = token
+        return next()
+      }
+    }
+    res.status(401).json({ fehler: 'Nicht angemeldet.' })
+  } catch (e) {
+    next(e)
+  }
+}
+
+function adminOnly(req, res, next) {
+  if (req.user.rolle !== 'verwaltung') return res.status(403).json({ fehler: 'Nur für die Verwaltung.' })
+  next()
+}
+
+const oeffentlicherBenutzer = (b) => ({
+  id: b.id,
+  benutzername: b.benutzername,
+  name: b.name,
+  rolle: b.rolle,
+  email: b.email,
+  einheitId: b.einheit_id,
+  aktiv: b.aktiv,
+  erstelltAm: b.erstellt_am,
+  letzterLogin: b.letzter_login ?? undefined,
+})
+
+async function sessionAnlegen(res, userId, req) {
+  const token = crypto.randomBytes(32).toString('hex')
+  await pool.query(
+    'INSERT INTO sessions (token, user_id, expires) VALUES ($1, $2, now() + $3 * interval \'1 millisecond\')',
+    [token, userId, SESSION_DAUER_MS],
+  )
+  cookieSetzen(res, token, SESSION_DAUER_MS, req.secure)
+}
+
+// ── Mapping-Helfer (snake_case → camelCase) ──────────────────
+const mapUnit = (u) => ({
+  id: u.id, building: u.building, number: u.number, floor: u.floor,
+  size: Number(u.size), coldRent: Number(u.cold_rent), warmRent: Number(u.warm_rent),
+  tenant: u.tenant, status: u.status,
+})
+const mapTransaction = (t) => ({
+  id: t.id, unitId: t.unit_id, tenant: t.tenant, month: t.month, year: t.year,
+  amount: Number(t.amount), type: t.type, status: t.status, paidAt: t.paid_at ?? undefined,
+})
+const mapTicket = (t) => ({
+  id: t.id, unitId: t.unit_id, tenant: t.tenant, title: t.title,
+  description: t.description, category: t.category, priority: t.priority,
+  status: t.status, createdAt: t.created_at,
+})
+const mapDocument = (d) => ({
+  id: d.id, unitId: d.unit_id, title: d.title, category: d.category, size: d.size, date: d.date,
+})
+const mapMessage = (m) => ({ id: m.id, from: m.from_role, author: m.author, text: m.text, at: m.at })
+const mapThread = (t) => ({
+  id: t.id, unitId: t.unit_id, tenant: t.tenant, subject: t.subject,
+  unreadByAdmin: t.unread_by_admin, unreadByTenant: t.unread_by_tenant,
+})
+const mapCode = (c) => ({ code: c.code, einheitId: c.einheit_id, erstelltAm: c.erstellt_am, verwendetAm: c.verwendet_am ?? undefined })
+const mapAnnouncement = (a) => ({ id: a.id, title: a.title, text: a.text, date: a.date, tag: a.tag })
+
+const deutschesDatum = () => new Date().toLocaleDateString('de-DE')
+const deutschesDatumZeit = () => new Date().toLocaleString('de-DE')
+
+// ── Health ───────────────────────────────────────────────────
+app.get('/api/healthz', async (_req, res) => {
+  try {
+    await pool.query('SELECT 1')
+    res.json({ ok: true, dienst: 'mp-api', datenbank: true })
+  } catch {
+    res.status(503).json({ ok: false, datenbank: false })
+  }
+})
+
+// ── Auth ─────────────────────────────────────────────────────
+app.post('/api/auth/login', async (req, res, next) => {
+  try {
+    const { benutzername, passwortHash } = req.body || {}
+    const { rows } = await pool.query(
+      'SELECT * FROM users WHERE lower(benutzername) = lower($1)',
+      [String(benutzername || '').trim()],
+    )
+    const b = rows[0]
+    if (!b || String(passwortHash || '') !== b.passwort_hash)
+      return res.status(401).json({ fehler: 'Benutzername oder Passwort falsch.' })
+    if (!b.aktiv)
+      return res.status(403).json({ fehler: 'Dieses Konto ist deaktiviert – bitte die Verwaltung kontaktieren.' })
+    await pool.query('UPDATE users SET letzter_login = $1 WHERE id = $2', [deutschesDatumZeit(), b.id])
+    await sessionAnlegen(res, b.id, req)
+    res.json({ benutzer: oeffentlicherBenutzer(b) })
+  } catch (e) { next(e) }
+})
+
+app.post('/api/auth/logout', async (req, res) => {
+  const token = cookieLesen(req, COOKIE_NAME)
+  if (token) await pool.query('DELETE FROM sessions WHERE token = $1', [token])
+  cookieSetzen(res, '', 0, req.secure)
+  res.json({ ok: true })
+})
+
+app.get('/api/auth/me', auth, (req, res) => {
+  res.json({ benutzer: oeffentlicherBenutzer(req.user) })
+})
+
+app.post('/api/auth/register', async (req, res, next) => {
+  try {
+    const { code, benutzername, name, email, passwortHash } = req.body || {}
+    const codeNorm = String(code || '').trim().toUpperCase()
+    const benutzernameNorm = String(benutzername || '').trim()
+    // Erst Benutzername prüfen, dann Code atomar verbrauchen (sonst wäre der
+    // Code bei einem vergebenen Benutzernamen trotzdem verbraucht)
+    const vorhanden = await pool.query('SELECT 1 FROM users WHERE lower(benutzername) = lower($1)', [benutzernameNorm])
+    if (vorhanden.rows.length)
+      return res.status(400).json({ fehler: 'Dieser Benutzername ist bereits vergeben.' })
+    const { rows: codeRows } = await pool.query(
+      `UPDATE registration_codes SET verwendet_am = $1
+       WHERE code = $2 AND verwendet_am IS NULL
+       RETURNING einheit_id`,
+      [deutschesDatum(), codeNorm],
+    )
+    if (!codeRows.length)
+      return res.status(400).json({ fehler: 'Der Registrierungscode ist ungültig oder bereits verwendet.' })
+    const id = `b-${Date.now()}`
+    const { rows } = await pool.query(
+      `INSERT INTO users (id, benutzername, name, passwort_hash, rolle, email, einheit_id, aktiv, erstellt_am)
+       VALUES ($1,$2,$3,$4,'mieter',$5,$6,TRUE,$7) RETURNING *`,
+      [id, benutzernameNorm, String(name || '').trim(), String(passwortHash || ''),
+       String(email || '').trim(), codeRows[0].einheit_id, deutschesDatum()],
+    )
+    await sessionAnlegen(res, id, req)
+    res.json({ benutzer: oeffentlicherBenutzer(rows[0]) })
+  } catch (e) { next(e) }
+})
+
+// ── Bootstrap (alle Stammdaten in einem Rutsch) ──────────────
+app.get('/api/bootstrap', auth, async (req, res, next) => {
+  try {
+    const istAdmin = req.user.rolle === 'verwaltung'
+    const einheit = req.user.einheit_id
+    const [units, transactions, documents, tickets, threads, messages, announcements, users, codes] =
+      await Promise.all([
+        pool.query('SELECT * FROM units ORDER BY id'),
+        istAdmin
+          ? pool.query('SELECT * FROM transactions ')
+          : pool.query('SELECT * FROM transactions WHERE unit_id = $1 ', [einheit]),
+        istAdmin
+          ? pool.query('SELECT * FROM documents ORDER BY date DESC')
+          : pool.query('SELECT * FROM documents WHERE unit_id = $1 OR unit_id IS NULL ORDER BY date DESC', [einheit]),
+        istAdmin
+          ? pool.query('SELECT * FROM tickets ORDER BY created_at DESC')
+          : pool.query('SELECT * FROM tickets WHERE unit_id = $1 ORDER BY created_at DESC', [einheit]),
+        istAdmin
+          ? pool.query('SELECT * FROM threads ORDER BY id DESC')
+          : pool.query('SELECT * FROM threads WHERE unit_id = $1 ORDER BY id DESC', [einheit]),
+        istAdmin
+          ? pool.query('SELECT * FROM messages')
+          : pool.query('SELECT m.* FROM messages m JOIN threads t ON t.id = m.thread_id WHERE t.unit_id = $1', [einheit]),
+        pool.query('SELECT * FROM announcements ORDER BY date DESC'),
+        istAdmin
+          ? pool.query('SELECT * FROM users ORDER BY name')
+          : { rows: [] },
+        istAdmin
+          ? pool.query('SELECT * FROM registration_codes ORDER BY erstellt_am DESC')
+          : { rows: [] },
+      ])
+    // Threads mit ihren Nachrichten zusammenführen
+    const nachrichtenProThread = {}
+    for (const m of messages.rows) {
+      ;(nachrichtenProThread[m.thread_id] ??= []).push(mapMessage(m))
+    }
+    const threadListe = threads.rows.map((t) => ({
+      ...mapThread(t),
+      messages: nachrichtenProThread[t.id] ?? [],
+    }))
+    res.json({
+      units: units.rows.map(mapUnit),
+      transactions: transactions.rows.map(mapTransaction),
+      documents: documents.rows.map(mapDocument),
+      tickets: tickets.rows.map(mapTicket),
+      threads: threadListe,
+      announcements: announcements.rows.map(mapAnnouncement),
+      benutzer: users.rows.map(oeffentlicherBenutzer),
+      codes: codes.rows.map(mapCode),
+    })
+  } catch (e) { next(e) }
+})
+
+// ── Tickets ──────────────────────────────────────────────────
+app.post('/api/tickets', auth, async (req, res, next) => {
+  try {
+    const { title, description, category, priority } = req.body || {}
+    if (!String(title || '').trim()) return res.status(400).json({ fehler: 'Titel fehlt.' })
+    const unitId = req.user.rolle === 'verwaltung'
+      ? String((req.body || {}).unitId || 'hs-1')
+      : req.user.einheit_id
+    const { rows: unitRows } = await pool.query('SELECT * FROM units WHERE id = $1', [unitId])
+    if (!unitRows.length) return res.status(400).json({ fehler: 'Wohnung unbekannt.' })
+    const id = `t-${Date.now()}`
+    const mieterName = req.user.rolle === 'verwaltung' ? 'Hinterstein Immobilien (intern)' : req.user.name
+    const { rows } = await pool.query(
+      `INSERT INTO tickets (id, unit_id, tenant, title, description, category, priority, status, created_at)
+       VALUES ($1,$2,$3,$4,$5,$6,$7,'offen',$8) RETURNING *`,
+      [id, unitId, mieterName, String(title).trim(), String(description || '–').trim(),
+       String(category || 'Sonstiges'), ['niedrig', 'mittel', 'hoch'].includes(priority) ? priority : 'mittel',
+       deutschesDatum()],
+    )
+    const label = mail.einheitLabel(mapUnit(unitRows[0]))
+    mail.benachrichtigeVerwaltung(
+      `Neue Schadensmeldung: ${String(title).trim()} (${label})`,
+      `Im Mieterportal wurde eine neue Schadensmeldung erstellt.\n\n` +
+        `Wohnung: ${label}\nMeldung von: ${mieterName}\nKategorie: ${String(category || 'Sonstiges')}\n\n` +
+        `${String(title).trim()}\n${String(description || '–').trim()}`,
+    )
+    res.json({ ticket: mapTicket(rows[0]) })
+  } catch (e) { next(e) }
+})
+
+app.patch('/api/tickets/:id', auth, adminOnly, async (req, res, next) => {
+  try {
+    const status = String((req.body || {}).status || '')
+    if (!['offen', 'in Bearbeitung', 'erledigt'].includes(status))
+      return res.status(400).json({ fehler: 'Ungültiger Status.' })
+    const { rows } = await pool.query(
+      'UPDATE tickets SET status = $1 WHERE id = $2 RETURNING *', [status, req.params.id],
+    )
+    if (!rows.length) return res.status(404).json({ fehler: 'Ticket nicht gefunden.' })
+    res.json({ ticket: mapTicket(rows[0]) })
+  } catch (e) { next(e) }
+})
+
+// ── Nachrichten (Threads) ────────────────────────────────────
+app.post('/api/threads', auth, async (req, res, next) => {
+  try {
+    const { subject, text, unitId: gewuenschteEinheit } = req.body || {}
+    if (!String(subject || '').trim() || !String(text || '').trim())
+      return res.status(400).json({ fehler: 'Betreff und Nachricht fehlen.' })
+    const unitId = req.user.rolle === 'verwaltung'
+      ? String(gewuenschteEinheit || 'hs-1')
+      : req.user.einheit_id
+    const { rows: unitRows } = await pool.query('SELECT * FROM units WHERE id = $1', [unitId])
+    if (!unitRows.length) return res.status(400).json({ fehler: 'Wohnung unbekannt.' })
+    const id = `m-${Date.now()}`
+    const vonRolle = req.user.rolle === 'verwaltung' ? 'admin' : 'tenant'
+    const autor = req.user.name
+    await pool.query(
+      `INSERT INTO threads (id, unit_id, tenant, subject, unread_by_admin, unread_by_tenant)
+       VALUES ($1,$2,$3,$4,$5,$6)`,
+      [id, unitId, req.user.rolle === 'verwaltung' ? autor : (unitRows[0].tenant ?? autor),
+       String(subject).trim(), vonRolle === 'tenant', vonRolle === 'admin'],
+    )
+    await pool.query(
+      `INSERT INTO messages (id, thread_id, from_role, author, text, at) VALUES ($1,$2,$3,$4,$5,$6)`,
+      [`${id}-1`, id, vonRolle, autor, String(text).trim(), deutschesDatumZeit()],
+    )
+    const betreff = vonRolle === 'tenant'
+      ? `Neue Nachricht im Mieterportal: ${String(subject).trim()}`
+      : `Nachricht der Verwaltung: ${String(subject).trim()}`
+    const inhalt = `Neue Unterhaltung von ${autor}:\n\n„${String(text).trim()}“`
+    if (vonRolle === 'tenant') mail.benachrichtigeVerwaltung(betreff, inhalt)
+    else mail.benachrichtigeMieter(unitId, betreff, inhalt)
+    const { rows } = await pool.query('SELECT * FROM threads WHERE id = $1', [id])
+    const { rows: msgRows } = await pool.query('SELECT * FROM messages WHERE thread_id = $1 ORDER BY at', [id])
+    res.json({ thread: { ...mapThread(rows[0]), messages: msgRows.map(mapMessage) } })
+  } catch (e) { next(e) }
+})
+
+app.post('/api/threads/:id/messages', auth, async (req, res, next) => {
+  try {
+    const text = String((req.body || {}).text || '').trim()
+    if (!text) return res.status(400).json({ fehler: 'Nachricht fehlt.' })
+    const { rows: threadRows } = await pool.query('SELECT * FROM threads WHERE id = $1', [req.params.id])
+    const th = threadRows[0]
+    if (!th) return res.status(404).json({ fehler: 'Unterhaltung nicht gefunden.' })
+    if (req.user.rolle === 'mieter' && th.unit_id !== req.user.einheit_id)
+      return res.status(403).json({ fehler: 'Kein Zugriff auf diese Unterhaltung.' })
+    const vonRolle = req.user.rolle === 'verwaltung' ? 'admin' : 'tenant'
+    const autor = req.user.name
+    const msgId = `${th.id}-${Date.now()}`
+    await pool.query(
+      `INSERT INTO messages (id, thread_id, from_role, author, text, at) VALUES ($1,$2,$3,$4,$5,$6)`,
+      [msgId, th.id, vonRolle, autor, text, deutschesDatumZeit()],
+    )
+    await pool.query(
+      `UPDATE threads SET unread_by_admin = $1, unread_by_tenant = $2 WHERE id = $3`,
+      [vonRolle === 'tenant', vonRolle === 'admin', th.id],
+    )
+    const betreff = vonRolle === 'tenant'
+      ? `Neue Antwort im Mieterportal: ${th.subject}`
+      : `Antwort der Verwaltung: ${th.subject}`
+    const inhalt = `Neue Nachricht von ${autor} in der Unterhaltung „${th.subject}“:\n\n„${text}“`
+    if (vonRolle === 'tenant') mail.benachrichtigeVerwaltung(betreff, inhalt)
+    else mail.benachrichtigeMieter(th.unit_id, betreff, inhalt)
+    const { rows: msgRows } = await pool.query('SELECT * FROM messages WHERE thread_id = $1 ORDER BY at', [th.id])
+    const { rows } = await pool.query('SELECT * FROM threads WHERE id = $1', [th.id])
+    res.json({ thread: { ...mapThread(rows[0]), messages: msgRows.map(mapMessage) } })
+  } catch (e) { next(e) }
+})
+
+app.post('/api/threads/:id/read', auth, async (req, res, next) => {
+  try {
+    const { rows: threadRows } = await pool.query('SELECT unit_id FROM threads WHERE id = $1', [req.params.id])
+    const th = threadRows[0]
+    if (!th) return res.status(404).json({ fehler: 'Unterhaltung nicht gefunden.' })
+    if (req.user.rolle === 'mieter' && th.unit_id !== req.user.einheit_id)
+      return res.status(403).json({ fehler: 'Kein Zugriff auf diese Unterhaltung.' })
+    if (req.user.rolle === 'verwaltung')
+      await pool.query('UPDATE threads SET unread_by_admin = FALSE WHERE id = $1', [req.params.id])
+    else
+      await pool.query('UPDATE threads SET unread_by_tenant = FALSE WHERE id = $1', [req.params.id])
+    res.json({ ok: true })
+  } catch (e) { next(e) }
+})
+
+// ── Benutzerverwaltung (nur Verwaltung) ──────────────────────
+app.get('/api/users', auth, adminOnly, async (_req, res, next) => {
+  try {
+    const { rows } = await pool.query('SELECT * FROM users ORDER BY name')
+    res.json({ benutzer: rows.map(oeffentlicherBenutzer) })
+  } catch (e) { next(e) }
+})
+
+app.post('/api/users', auth, adminOnly, async (req, res, next) => {
+  try {
+    const { benutzername, name, rolle, email, passwortHash, einheitId } = req.body || {}
+    if (!['verwaltung', 'mieter'].includes(rolle)) return res.status(400).json({ fehler: 'Ungültige Rolle.' })
+    const benutzernameNorm = String(benutzername || '').trim()
+    const vorhanden = await pool.query('SELECT 1 FROM users WHERE lower(benutzername) = lower($1)', [benutzernameNorm])
+    if (vorhanden.rows.length) return res.status(400).json({ fehler: 'Dieser Benutzername ist bereits vergeben.' })
+    const id = `b-${Date.now()}`
+    const { rows } = await pool.query(
+      `INSERT INTO users (id, benutzername, name, passwort_hash, rolle, email, einheit_id, aktiv, erstellt_am)
+       VALUES ($1,$2,$3,$4,$5,$6,$7,TRUE,$8) RETURNING *`,
+      [id, benutzernameNorm, String(name || '').trim(), String(passwortHash || ''), rolle,
+       String(email || '').trim(), rolle === 'mieter' ? (einheitId || null) : null, deutschesDatum()],
+    )
+    res.json({ benutzer: oeffentlicherBenutzer(rows[0]) })
+  } catch (e) { next(e) }
+})
+
+app.patch('/api/users/:id', auth, adminOnly, async (req, res, next) => {
+  try {
+    const b = req.body || {}
+    const { rows } = await pool.query('SELECT * FROM users WHERE id = $1', [req.params.id])
+    if (!rows.length) return res.status(404).json({ fehler: 'Benutzer nicht gefunden.' })
+    if (b.passwortHash !== undefined)
+      await pool.query('UPDATE users SET passwort_hash = $1 WHERE id = $2', [String(b.passwortHash), req.params.id])
+    if (b.aktiv !== undefined)
+      await pool.query('UPDATE users SET aktiv = $1 WHERE id = $2', [Boolean(b.aktiv), req.params.id])
+    if (b.einheitId !== undefined)
+      await pool.query('UPDATE users SET einheit_id = $1 WHERE id = $2', [b.einheitId || null, req.params.id])
+    const { rows: neu } = await pool.query('SELECT * FROM users WHERE id = $1', [req.params.id])
+    res.json({ benutzer: oeffentlicherBenutzer(neu[0]) })
+  } catch (e) { next(e) }
+})
+
+// ── Registrierungscodes (nur Verwaltung) ─────────────────────
+app.get('/api/codes', auth, adminOnly, async (_req, res, next) => {
+  try {
+    const { rows } = await pool.query('SELECT * FROM registration_codes ORDER BY erstellt_am DESC')
+    res.json({ codes: rows.map(mapCode) })
+  } catch (e) { next(e) }
+})
+
+app.post('/api/codes', auth, adminOnly, async (req, res, next) => {
+  try {
+    const anzahl = Math.min(Math.max(parseInt((req.body || {}).anzahl, 10) || 1, 1), 50)
+    const einheitId = (req.body || {}).einheitId || null
+    if (einheitId) {
+      const u = await pool.query('SELECT 1 FROM units WHERE id = $1', [einheitId])
+      if (!u.rows.length) return res.status(400).json({ fehler: 'Wohnung unbekannt.' })
+    }
+    const teil = () =>
+      Array.from(crypto.randomBytes(2)).map((b) => b.toString(16).padStart(2, '0')).join('').toUpperCase()
+    const neu = []
+    for (let i = 0; i < anzahl; i++) {
+      const code = `MP-${teil()}-${teil()}`
+      await pool.query(
+        'INSERT INTO registration_codes (code, einheit_id, erstellt_am) VALUES ($1,$2,$3)',
+        [code, einheitId, deutschesDatum()],
+      )
+      neu.push({ code, einheitId, erstelltAm: deutschesDatum() })
+    }
+    res.json({ codes: neu })
+  } catch (e) { next(e) }
+})
+
+// ── Fehlerbehandlung ─────────────────────────────────────────
+app.use((err, _req, res, _next) => {
+  console.error('[api]', err)
+  res.status(500).json({ fehler: 'Interner Serverfehler.' })
+})
+
+// ── Start ────────────────────────────────────────────────────
+async function warteAufDatenbank() {
+  let letzterFehler = null
+  for (let versuch = 1; versuch <= 30; versuch++) {
+    try {
+      await init()
+      return
+    } catch (e) {
+      letzterFehler = e
+      console.log(`[api] Datenbank nicht bereit (Versuch ${versuch}/30) …`)
+      await new Promise((r) => setTimeout(r, 2000))
+    }
+  }
+  throw letzterFehler
+}
+
+async function start() {
+  // Warten, bis die Datenbank erreichbar ist (Container-Start-Reihenfolge)
+  await warteAufDatenbank()
+  const geseedet = await seed()
+  if (geseedet) console.log('[api] Demo-Daten eingespielt (50 Wohnungen, 552 Buchungen, …)')
+  setInterval(sessionsAufraeumen, 60 * 60 * 1000).unref()
+  app.listen(PORT, () => console.log(`[api] mp-api lauscht auf :${PORT}`))
+}
+
+start().catch((e) => {
+  console.error('[api] Start fehlgeschlagen:', e)
+  process.exit(1)
+})
diff --git a/server/src/mail.js b/server/src/mail.js
new file mode 100644
index 0000000..7e54208
--- /dev/null
+++ b/server/src/mail.js
@@ -0,0 +1,49 @@
+/** Serverseitiger E-Mail-Versand über die Portal-Mail-API (mp-mail-api).
+ *
+ * Fire-and-forget: Ein Fehler (Mail-API down, Relay-Fehler) beeinträchtigt
+ * die auslösende Portal-Aktion nie. Die Mail-API selbst puffert im Fehlerfall
+ * in ihrer Outbox und versucht es erneut.
+ */
+
+const MAIL_API_URL = process.env.MAIL_API_URL || '' // z. B. http://mp-mail-api:8080
+const MAIL_API_TOKEN = process.env.MAIL_API_TOKEN || ''
+
+const FUSSZEILE =
+  '\n\n— Automatische Benachrichtigung aus dem Mieterportal der Hinterstein Immobilien'
+
+async function sendeMail(an, betreff, text) {
+  if (!MAIL_API_URL || !MAIL_API_TOKEN || !an) return
+  try {
+    const res = await fetch(`${MAIL_API_URL}/send`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json', 'X-Api-Token': MAIL_API_TOKEN },
+      body: JSON.stringify({ to: an, subject: betreff, text: `${text}${FUSSZEILE}` }),
+    })
+    if (!res.ok) console.warn(`[mail] Versand an ${an} fehlgeschlagen: HTTP ${res.status}`)
+  } catch (e) {
+    console.warn(`[mail] Versand an ${an} fehlgeschlagen:`, e.message)
+  }
+}
+
+/** Alle aktiven Verwaltungsnutzer benachrichtigen. */
+async function benachrichtigeVerwaltung(betreff, text) {
+  const { rows } = await require('./db').pool.query(
+    `SELECT email FROM users WHERE rolle = 'verwaltung' AND aktiv AND email <> ''`,
+  )
+  for (const r of rows) sendeMail(r.email, betreff, text)
+}
+
+/** Mieter einer bestimmten Wohnung benachrichtigen. */
+async function benachrichtigeMieter(einheitId, betreff, text) {
+  const { rows } = await require('./db').pool.query(
+    `SELECT email FROM users WHERE rolle = 'mieter' AND aktiv AND einheit_id = $1 AND email <> ''`,
+    [einheitId],
+  )
+  for (const r of rows) sendeMail(r.email, betreff, text)
+}
+
+function einheitLabel(u) {
+  return u ? `${u.building}, Whg. ${u.number}` : ''
+}
+
+module.exports = { sendeMail, benachrichtigeVerwaltung, benachrichtigeMieter, einheitLabel }
diff --git a/server/src/seed-data.js b/server/src/seed-data.js
new file mode 100644
index 0000000..5fc874e
--- /dev/null
+++ b/server/src/seed-data.js
@@ -0,0 +1,144 @@
+/** Handgeschriebene Demo-Daten (vormals src/data/seed.ts).
+ *
+ * units + transactions kommen maschinell aus seed/generated.json
+ * (beispieldaten.py). Die Verwaltungs-E-Mail ist bewusst ein echtes,
+ * zustellbares Postfach (axel@hocks.eu), damit Benachrichtigungen ankommen;
+ * im Portal änderbar (Benutzerverwaltung).
+ */
+
+const DEMO_HASH = 'c57a5df4f97ed6914116e5fd1348406064834f22503d890eb571af442ac4b4c3' // sha256("0815")
+
+const users = [
+  {
+    id: 'b-joseph',
+    benutzername: 'j.hinterstein',
+    name: 'Joseph Hinterstein',
+    passwort_hash: DEMO_HASH,
+    rolle: 'verwaltung',
+    email: 'axel@hocks.eu',
+    einheit_id: null,
+    aktiv: true,
+    erstellt_am: '01.03.2024',
+  },
+  {
+    id: 'b-anna',
+    benutzername: 'a.berger',
+    name: 'Anna Berger',
+    passwort_hash: DEMO_HASH,
+    rolle: 'mieter',
+    email: 'anna.berger@example.de',
+    einheit_id: 'hs-7',
+    aktiv: true,
+    erstellt_am: '01.03.2024',
+    letzter_login: '02.10.2026, 09:12',
+  },
+  {
+    id: 'b-jonas',
+    benutzername: 'm.wolf',
+    name: 'Jonas Klein',
+    passwort_hash: DEMO_HASH,
+    rolle: 'mieter',
+    email: 'jonas.klein@example.de',
+    einheit_id: 'rw-4',
+    aktiv: true,
+    erstellt_am: '15.08.2025',
+  },
+]
+
+const registrationCodes = [
+  { code: 'MP-2026-0815', einheit_id: 'ap-2', erstellt_am: '02.10.2026', verwendet_am: null },
+]
+
+const tickets = [
+  {
+    id: 't-1', unit_id: 'hs-7', tenant: 'Anna Berger',
+    title: 'Wasserhahn im Bad tropft',
+    description: 'Der Wasserhahn am Waschbecken tropft seit einigen Tagen permanent, auch bei ganz zugedrehtem Ventil.',
+    category: 'Sanitär', priority: 'mittel', status: 'in Bearbeitung', created_at: '28.09.2026',
+  },
+  {
+    id: 't-2', unit_id: 'hs-7', tenant: 'Anna Berger',
+    title: 'Briefkastenschlüssel defekt',
+    description: 'Der Schlüssel für den Briefkasten lässt sich nicht mehr drehen, vermutlich Schloss verklebt.',
+    category: 'Schlüssel', priority: 'niedrig', status: 'offen', created_at: '30.09.2026',
+  },
+  {
+    id: 't-3', unit_id: 'rw-4', tenant: 'Jonas Klein',
+    title: 'Heizkörper wird nicht warm',
+    description: 'Der Heizkörper im Wohnzimmer bleibt kalt, obwohl das Thermostat voll aufgedreht ist.',
+    category: 'Heizung', priority: 'hoch', status: 'offen', created_at: '01.10.2026',
+  },
+  {
+    id: 't-4', unit_id: 'ap-2', tenant: 'Anja Roth',
+    title: 'Rollladen im Schlafzimmer klemmt',
+    description: 'Der elektrische Rollladen fährt nur noch zur Hälfte hoch.',
+    category: 'Fenster / Rollladen', priority: 'mittel', status: 'in Bearbeitung', created_at: '25.09.2026',
+  },
+  {
+    id: 't-5', unit_id: 'hs-14', tenant: 'Markus Lange',
+    title: 'Flurbeleuchtung im Treppenhaus defekt',
+    description: 'Im 3. OG ist die Bewegungsmelder-Leuchte ausgefallen.',
+    category: 'Elektrik', priority: 'hoch', status: 'erledigt', created_at: '18.09.2026',
+  },
+  {
+    id: 't-6', unit_id: 'rw-9', tenant: 'Sandra Weiß',
+    title: 'Schimmel im Bad – Lüftungsproblem?',
+    description: 'In der Fensterfalz des Bades sammelt sich Kondenswasser, bitte um Prüfung der Lüftung.',
+    category: 'Sanitär', priority: 'hoch', status: 'in Bearbeitung', created_at: '22.09.2026',
+  },
+  {
+    id: 't-7', unit_id: 'ap-11', tenant: 'Thomas Neumann',
+    title: 'Markise auf dem Balkon lose',
+    description: 'Die Befestigung der Markise wackelt bei Wind deutlich.',
+    category: 'Balkon / Außenanlage', priority: 'hoch', status: 'offen', created_at: '29.09.2026',
+  },
+  {
+    id: 't-8', unit_id: 'hs-3', tenant: 'Petra Hoffmann',
+    title: 'Spülmaschinen-Anschluss undicht',
+    description: 'Unter der Spüle steht Wasser, vermutlich kommt es vom Geräteanschluss.',
+    category: 'Sanitär', priority: 'mittel', status: 'erledigt', created_at: '10.09.2026',
+  },
+]
+
+// Mieter-Namen für tickets der fremden Wohnungen stammen aus generated.json;
+// seed.js ersetzt leere/Platzhalter-Namen beim Einfügen aus der units-Tabelle.
+
+const documents = [
+  { id: 'd-1', unit_id: 'hs-7', title: 'Mietvertrag Anna Berger – Hauptstraße 12, Whg. 7', category: 'Mietvertrag', size: '1,8 MB', date: '01.03.2024' },
+  { id: 'd-2', unit_id: 'hs-7', title: 'Nebenkostenabrechnung 2025', category: 'Nebenkostenabrechnung', size: '640 KB', date: '31.05.2026' },
+  { id: 'd-3', unit_id: 'hs-7', title: 'Heizkostenabrechnung 2025', category: 'Nebenkostenabrechnung', size: '410 KB', date: '31.05.2026' },
+  { id: 'd-4', unit_id: null, title: 'Hausordnung – gültige Fassung 2026', category: 'Hausordnung', size: '220 KB', date: '01.01.2026' },
+  { id: 'd-5', unit_id: null, title: 'Protokoll Hausversammlung 14.06.2026', category: 'Protokoll', size: '350 KB', date: '14.06.2026' },
+  { id: 'd-6', unit_id: null, title: 'Mülltonnen-Belegungsplan & Abfuhrtermine 2026', category: 'Sonstiges', size: '180 KB', date: '02.01.2026' },
+  { id: 'd-7', unit_id: 'rw-4', title: 'Mietvertrag – Ringweg 3, Whg. 4', category: 'Mietvertrag', size: '1,6 MB', date: '15.08.2025' },
+  { id: 'd-8', unit_id: 'ap-2', title: 'Mietvertrag – Am Park 5, Whg. 2', category: 'Mietvertrag', size: '1,7 MB', date: '01.06.2024' },
+]
+
+const threads = [
+  {
+    id: 'm-1', unit_id: 'hs-7', tenant: 'Anna Berger',
+    subject: 'Mietkaution – Rückzahlungsnachweis',
+    unread_by_admin: false, unread_by_tenant: true,
+    messages: [
+      { id: 'm-1-a', from_role: 'tenant', author: 'Anna Berger', text: 'Guten Tag, könnten Sie mir bitte den aktuellen Stand meiner Mietkaution mit Nachweis der Verzinsung zusenden?', at: '27.09.2026, 10:12' },
+      { id: 'm-1-b', from_role: 'admin', author: 'Joseph Hinterstein', text: 'Guten Tag Frau Berger, die Kaution wurde mit 1.500,00 € auf dem Treuhandkonto verbucht. Die Verzinsung für 2025 beträgt 18,40 € – den Nachweis finden Sie ab sofort auch unter Dokumente.', at: '29.09.2026, 09:03' },
+    ],
+  },
+  {
+    id: 'm-2', unit_id: 'rw-9', tenant: 'Sandra Weiß',
+    subject: 'Terminabstimmung Wohnungsbegehung (Schimmel)',
+    unread_by_admin: true, unread_by_tenant: false,
+    messages: [
+      { id: 'm-2-a', from_role: 'tenant', author: 'Sandra Weiß', text: 'Aufgrund der Schadensmeldung schlage ich einen Begehungstermin nächste Woche vor. Passt Mittwoch oder Freitag Nachmittag?', at: '01.10.2026, 08:45' },
+    ],
+  },
+]
+
+const announcements = [
+  { id: 'a-1', title: 'Wasserabschaltung Hauptstraße 12', text: 'Am Donnerstag, 08.10.2026, 09:00–13:00 Uhr findet eine Druckerhöhungs-Pumpen-Wartung statt. In dieser Zeit steht kein Wasser zur Verfügung.', date: '02.10.2026', tag: 'Technik' },
+  { id: 'a-2', title: 'Herbst-Hausbegehung mit Hausmeister', text: 'Am Samstag, 17.10.2026, 10:00 Uhr geht es gemeinsam durch alle Häuser. Anschließend gibt es Kaffee im Hof von Am Park 5.', date: '28.09.2026', tag: 'Termin' },
+  { id: 'a-3', title: 'Tiefgarage Ringweg 3: Reinigung', text: 'Die Tiefgarage wird am 21.10.2026 gereinigt. Bitte Fahrzeuge bis 07:30 Uhr entfernen, sonst erfolgt ein kostenpflichtiges Versetzen.', date: '20.09.2026', tag: 'Hinweis' },
+  { id: 'a-4', title: 'Nebenkostenabrechnungen 2025 versandt', text: 'Alle Abrechnungen liegen digital im Dokumentenbereich vor. Nachzahlungen sind bis 31.10.2026 überwiesen.', date: '31.05.2026', tag: 'Abrechnung' },
+]
+
+module.exports = { users, registrationCodes, tickets, documents, threads, announcements }
diff --git a/server/src/seed.js b/server/src/seed.js
new file mode 100644
index 0000000..eb22338
--- /dev/null
+++ b/server/src/seed.js
@@ -0,0 +1,100 @@
+/** Idempotenter Seed: füllt die Datenbank beim ersten Start mit den
+ * Demo-Daten (50 Wohnungen, 552 Buchungen, Tickets, Dokumente, Threads,
+ * Ankündigungen, Demo-Benutzer, Registrierungscode). Läuft nur, wenn die
+ * users-Tabelle leer ist – bestehende Daten werden nie überschrieben.
+ */
+
+const { pool } = require('./db')
+const { users, registrationCodes, tickets, documents, threads, announcements } = require('./seed-data')
+const generated = require('../seed/generated.json')
+
+async function seed() {
+  const { rows } = await pool.query('SELECT COUNT(*)::int AS n FROM users')
+  if (rows[0].n > 0) return false
+
+  const client = await pool.connect()
+  try {
+    await client.query('BEGIN')
+
+    for (const u of generated.units) {
+      await client.query(
+        `INSERT INTO units (id, building, number, floor, size, cold_rent, warm_rent, tenant, status)
+         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)`,
+        [u.id, u.building, u.number, u.floor, u.size, u.coldRent, u.warmRent, u.tenant, u.status],
+      )
+    }
+
+    for (const t of generated.transactions) {
+      await client.query(
+        `INSERT INTO transactions (id, unit_id, tenant, month, year, amount, type, status, paid_at)
+         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)`,
+        [t.id, t.unitId, t.tenant, t.month, t.year, t.amount, t.type, t.status, t.paidAt ?? null],
+      )
+    }
+
+    // Mieter-Namen in Tickets/Threads aus der units-Tabelle nachziehen
+    const { rows: unitRows } = await client.query('SELECT id, tenant FROM units')
+    const mieterVon = Object.fromEntries(unitRows.map((u) => [u.id, u.tenant]))
+
+    for (const t of tickets) {
+      await client.query(
+        `INSERT INTO tickets (id, unit_id, tenant, title, description, category, priority, status, created_at)
+         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)`,
+        [t.id, t.unit_id, mieterVon[t.unit_id] ?? t.tenant, t.title, t.description, t.category, t.priority, t.status, t.created_at],
+      )
+    }
+
+    for (const d of documents) {
+      await client.query(
+        `INSERT INTO documents (id, unit_id, title, category, size, date) VALUES ($1,$2,$3,$4,$5,$6)`,
+        [d.id, d.unit_id, d.title, d.category, d.size, d.date],
+      )
+    }
+
+    for (const th of threads) {
+      await client.query(
+        `INSERT INTO threads (id, unit_id, tenant, subject, unread_by_admin, unread_by_tenant)
+         VALUES ($1,$2,$3,$4,$5,$6)`,
+        [th.id, th.unit_id, mieterVon[th.unit_id] ?? th.tenant, th.subject, th.unread_by_admin, th.unread_by_tenant],
+      )
+      for (const m of th.messages) {
+        await client.query(
+          `INSERT INTO messages (id, thread_id, from_role, author, text, at) VALUES ($1,$2,$3,$4,$5,$6)`,
+          [m.id, th.id, m.from_role, m.author, m.text, m.at],
+        )
+      }
+    }
+
+    for (const a of announcements) {
+      await client.query(
+        `INSERT INTO announcements (id, title, text, date, tag) VALUES ($1,$2,$3,$4,$5)`,
+        [a.id, a.title, a.text, a.date, a.tag],
+      )
+    }
+
+    for (const b of users) {
+      await client.query(
+        `INSERT INTO users (id, benutzername, name, passwort_hash, rolle, email, einheit_id, aktiv, erstellt_am, letzter_login)
+         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10)`,
+        [b.id, b.benutzername, b.name, b.passwort_hash, b.rolle, b.email, b.einheit_id, b.aktiv, b.erstellt_am, b.letzter_login ?? null],
+      )
+    }
+
+    for (const c of registrationCodes) {
+      await client.query(
+        `INSERT INTO registration_codes (code, einheit_id, erstellt_am, verwendet_am) VALUES ($1,$2,$3,$4)`,
+        [c.code, c.einheit_id, c.erstellt_am, c.verwendet_am],
+      )
+    }
+
+    await client.query('COMMIT')
+    return true
+  } catch (e) {
+    await client.query('ROLLBACK')
+    throw e
+  } finally {
+    client.release()
+  }
+}
+
+module.exports = { seed }
diff --git a/src/App.tsx b/src/App.tsx
index 531f0a4..3af44a4 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -9,14 +9,27 @@ import Documents from './pages/Documents'
 import Messages from './pages/Messages'
 import BenutzerVerwaltung from './pages/BenutzerVerwaltung'
 
+function Ladebildschirm() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-[#22333b]">
+      <div className="text-center text-slate-300">
+        <div className="text-lg font-semibold text-white">Hinterstein Immobilien</div>
+        <div className="mt-1 text-sm">Mieterportal wird geladen …</div>
+      </div>
+    </div>
+  )
+}
+
 function RequireAuth({ children }: { children: React.ReactElement }) {
-  const { me } = useStore()
+  const { me, bereit } = useStore()
+  if (!bereit) return <Ladebildschirm />
   if (!me) return <Navigate to="/login" replace />
   return children
 }
 
 function LoginGate() {
-  const { me } = useStore()
+  const { me, bereit } = useStore()
+  if (!bereit) return <Ladebildschirm />
   if (me) return <Navigate to="/" replace />
   return <Login />
 }
diff --git a/src/data/seed.ts b/src/data/seed.ts
deleted file mode 100644
index 3b3fed0..0000000
--- a/src/data/seed.ts
+++ /dev/null
@@ -1,251 +0,0 @@
-import type {
-  Unit,
-  Transaction,
-  Ticket,
-  DocumentItem,
-  Thread,
-  Announcement,
-} from '../types'
-import generated from './generated.json'
-
-// Demo-Mieter: Whg. Hauptstraße 12 Nr. 7
-export const DEMO_TENANT = 'Anna Berger'
-export const DEMO_UNIT_ID = 'hs-7'
-
-// Maschinell erzeugte Bestandsdaten (beispieldaten.py -> generated.json)
-export const units = generated.units as Unit[]
-export const transactions = generated.transactions as Transaction[]
-
-export const tickets: Ticket[] = [
-  {
-    id: 't-1',
-    unitId: DEMO_UNIT_ID,
-    tenant: DEMO_TENANT,
-    title: 'Wasserhahn im Bad tropft',
-    description:
-      'Der Wasserhahn am Waschbecken tropft seit einigen Tagen permanent, auch bei ganz zugedrehtem Ventil.',
-    category: 'Sanitär',
-    priority: 'mittel',
-    status: 'in Bearbeitung',
-    createdAt: '28.09.2026',
-  },
-  {
-    id: 't-2',
-    unitId: DEMO_UNIT_ID,
-    tenant: DEMO_TENANT,
-    title: 'Briefkastenschlüssel defekt',
-    description: 'Der Schlüssel für den Briefkasten lässt sich nicht mehr drehen, vermutlich Schloss verklebt.',
-    category: 'Schlüssel',
-    priority: 'niedrig',
-    status: 'offen',
-    createdAt: '30.09.2026',
-  },
-  {
-    id: 't-3',
-    unitId: 'rw-4',
-    tenant: units.find((u) => u.id === 'rw-4')?.tenant ?? '',
-    title: 'Heizkörper wird nicht warm',
-    description: 'Der Heizkörper im Wohnzimmer bleibt kalt, obwohl das Thermostat voll aufgedreht ist.',
-    category: 'Heizung',
-    priority: 'hoch',
-    status: 'offen',
-    createdAt: '01.10.2026',
-  },
-  {
-    id: 't-4',
-    unitId: 'ap-2',
-    tenant: units.find((u) => u.id === 'ap-2')?.tenant ?? '',
-    title: 'Rollladen im Schlafzimmer klemmt',
-    description: 'Der elektrische Rollladen fährt nur noch zur Hälfte hoch.',
-    category: 'Fenster / Rollladen',
-    priority: 'mittel',
-    status: 'in Bearbeitung',
-    createdAt: '25.09.2026',
-  },
-  {
-    id: 't-5',
-    unitId: 'hs-14',
-    tenant: units.find((u) => u.id === 'hs-14')?.tenant ?? '',
-    title: 'Flurbeleuchtung im Treppenhaus defekt',
-    description: 'Im 3. OG ist die Bewegungsmelder-Leuchte ausgefallen.',
-    category: 'Elektrik',
-    priority: 'hoch',
-    status: 'erledigt',
-    createdAt: '18.09.2026',
-  },
-  {
-    id: 't-6',
-    unitId: 'rw-9',
-    tenant: units.find((u) => u.id === 'rw-9')?.tenant ?? '',
-    title: 'Schimmel im Bad – Lüftungsproblem?',
-    description: 'In der Fensterfalz des Bades sammelt sich Kondenswasser, bitte um Prüfung der Lüftung.',
-    category: 'Sanitär',
-    priority: 'hoch',
-    status: 'in Bearbeitung',
-    createdAt: '22.09.2026',
-  },
-  {
-    id: 't-7',
-    unitId: 'ap-11',
-    tenant: units.find((u) => u.id === 'ap-11')?.tenant ?? '',
-    title: 'Markise auf dem Balkon lose',
-    description: 'Die Befestigung der Markise wackelt bei Wind deutlich.',
-    category: 'Balkon / Außenanlage',
-    priority: 'hoch',
-    status: 'offen',
-    createdAt: '29.09.2026',
-  },
-  {
-    id: 't-8',
-    unitId: 'hs-3',
-    tenant: units.find((u) => u.id === 'hs-3')?.tenant ?? '',
-    title: 'Spülmaschinen-Anschluss undicht',
-    description: 'Unter der Spüle steht Wasser, vermutlich kommt es vom Geräteanschluss.',
-    category: 'Sanitär',
-    priority: 'mittel',
-    status: 'erledigt',
-    createdAt: '10.09.2026',
-  },
-]
-
-export const documents: DocumentItem[] = [
-  {
-    id: 'd-1',
-    unitId: DEMO_UNIT_ID,
-    title: 'Mietvertrag Anna Berger – Hauptstraße 12, Whg. 7',
-    category: 'Mietvertrag',
-    size: '1,8 MB',
-    date: '01.03.2024',
-  },
-  {
-    id: 'd-2',
-    unitId: DEMO_UNIT_ID,
-    title: 'Nebenkostenabrechnung 2025',
-    category: 'Nebenkostenabrechnung',
-    size: '640 KB',
-    date: '31.05.2026',
-  },
-  {
-    id: 'd-3',
-    unitId: DEMO_UNIT_ID,
-    title: 'Heizkostenabrechnung 2025',
-    category: 'Nebenkostenabrechnung',
-    size: '410 KB',
-    date: '31.05.2026',
-  },
-  {
-    id: 'd-4',
-    unitId: null,
-    title: 'Hausordnung – gültige Fassung 2026',
-    category: 'Hausordnung',
-    size: '220 KB',
-    date: '01.01.2026',
-  },
-  {
-    id: 'd-5',
-    unitId: null,
-    title: 'Protokoll Hausversammlung 14.06.2026',
-    category: 'Protokoll',
-    size: '350 KB',
-    date: '14.06.2026',
-  },
-  {
-    id: 'd-6',
-    unitId: null,
-    title: 'Mülltonnen-Belegungsplan & Abfuhrtermine 2026',
-    category: 'Sonstiges',
-    size: '180 KB',
-    date: '02.01.2026',
-  },
-  {
-    id: 'd-7',
-    unitId: 'rw-4',
-    title: 'Mietvertrag – Ringweg 3, Whg. 4',
-    category: 'Mietvertrag',
-    size: '1,6 MB',
-    date: '15.08.2025',
-  },
-  {
-    id: 'd-8',
-    unitId: 'ap-2',
-    title: 'Mietvertrag – Am Park 5, Whg. 2',
-    category: 'Mietvertrag',
-    size: '1,7 MB',
-    date: '01.06.2024',
-  },
-]
-
-export const threads: Thread[] = [
-  {
-    id: 'm-1',
-    unitId: DEMO_UNIT_ID,
-    tenant: DEMO_TENANT,
-    subject: 'Mietkaution – Rückzahlungsnachweis',
-    unreadByAdmin: false,
-    unreadByTenant: true,
-    messages: [
-      {
-        id: 'm-1-a',
-        from: 'tenant',
-        author: DEMO_TENANT,
-        text: 'Guten Tag, könnten Sie mir bitte den aktuellen Stand meiner Mietkaution mit Nachweis der Verzinsung zusenden?',
-        at: '27.09.2026, 10:12',
-      },
-      {
-        id: 'm-1-b',
-        from: 'admin',
-        author: 'Joseph Hinterstein',
-        text: 'Guten Tag Frau Berger, die Kaution wurde mit 1.500,00 € auf dem Treuhandkonto verbucht. Die Verzinsung für 2025 beträgt 18,40 € – den Nachweis finden Sie ab sofort auch unter Dokumente.',
-        at: '29.09.2026, 09:03',
-      },
-    ],
-  },
-  {
-    id: 'm-2',
-    unitId: 'rw-9',
-    tenant: units.find((u) => u.id === 'rw-9')?.tenant ?? '',
-    subject: 'Terminabstimmung Wohnungsbegehung (Schimmel)',
-    unreadByAdmin: true,
-    unreadByTenant: false,
-    messages: [
-      {
-        id: 'm-2-a',
-        from: 'tenant',
-        author: units.find((u) => u.id === 'rw-9')?.tenant ?? '',
-        text: 'Aufgrund der Schadensmeldung schlage ich einen Begehungstermin nächste Woche vor. Passt Mittwoch oder Freitag Nachmittag?',
-        at: '01.10.2026, 08:45',
-      },
-    ],
-  },
-]
-
-export const announcements: Announcement[] = [
-  {
-    id: 'a-1',
-    title: 'Wasserabschaltung Hauptstraße 12',
-    text: 'Am Donnerstag, 08.10.2026, 09:00–13:00 Uhr findet eine Druckerhöhungs-Pumpen-Wartung statt. In dieser Zeit steht kein Wasser zur Verfügung.',
-    date: '02.10.2026',
-    tag: 'Technik',
-  },
-  {
-    id: 'a-2',
-    title: 'Herbst-Hausbegehung mit Hausmeister',
-    text: 'Am Samstag, 17.10.2026, 10:00 Uhr geht es gemeinsam durch alle Häuser. Anschließend gibt es Kaffee im Hof von Am Park 5.',
-    date: '28.09.2026',
-    tag: 'Termin',
-  },
-  {
-    id: 'a-3',
-    title: 'Tiefgarage Ringweg 3: Reinigung',
-    text: 'Die Tiefgarage wird am 21.10.2026 gereinigt. Bitte Fahrzeuge bis 07:30 Uhr entfernen, sonst erfolgt ein kostenpflichtiges Versetzen.',
-    date: '20.09.2026',
-    tag: 'Hinweis',
-  },
-  {
-    id: 'a-4',
-    title: 'Nebenkostenabrechnungen 2025 versandt',
-    text: 'Alle Abrechnungen liegen digital im Dokumentenbereich vor. Nachzahlungen sind bis 31.10.2026 überwiesen.',
-    date: '31.05.2026',
-    tag: 'Abrechnung',
-  },
-]
diff --git a/src/lib/api.ts b/src/lib/api.ts
new file mode 100644
index 0000000..978da23
--- /dev/null
+++ b/src/lib/api.ts
@@ -0,0 +1,54 @@
+/** Dünner Fetch-Client für die Portal-API (gleicher Ursprung, Session-Cookie). */
+
+export class ApiFehler extends Error {
+  status: number
+  constructor(status: number, nachricht: string) {
+    super(nachricht)
+    this.status = status
+  }
+}
+
+interface Antwort<T> {
+  json: T | null
+  status: number
+}
+
+async function anfrage<T>(pfad: string, init?: RequestInit, json?: unknown): Promise<Antwort<T>> {
+  let res: Response
+  try {
+    res = await fetch(pfad, {
+      credentials: 'same-origin',
+      ...init,
+      headers: {
+        ...(json !== undefined ? { 'Content-Type': 'application/json' } : {}),
+        ...(init?.headers ?? {}),
+      },
+      ...(json !== undefined ? { body: JSON.stringify(json) } : {}),
+    })
+  } catch {
+    throw new ApiFehler(0, 'Keine Verbindung zum Server.')
+  }
+  let daten: T | null = null
+  try {
+    daten = (await res.json()) as T
+  } catch {
+    /* leerer Body */
+  }
+  return { json: daten, status: res.status }
+}
+
+/** Führt eine API-Anfrage aus und liefert Daten oder eine deutschsprachige Fehlermeldung. */
+export async function api<T>(pfad: string, init?: RequestInit, json?: unknown): Promise<T> {
+  const { json: daten, status } = await anfrage<T>(pfad, init, json)
+  if (status >= 400 || daten === null) {
+    const fehler =
+      (daten as { fehler?: string } | null)?.fehler ??
+      (status === 401 ? 'Sitzung abgelaufen – bitte erneut anmelden.' : `Fehler (${status}).`)
+    throw new ApiFehler(status, fehler)
+  }
+  return daten
+}
+
+export const apiGet = <T>(pfad: string) => api<T>(pfad)
+export const apiPost = <T>(pfad: string, body?: unknown) => api<T>(pfad, { method: 'POST' }, body ?? {})
+export const apiPatch = <T>(pfad: string, body?: unknown) => api<T>(pfad, { method: 'PATCH' }, body ?? {})
diff --git a/src/lib/auth.ts b/src/lib/auth.ts
index 083c928..8b6da40 100644
--- a/src/lib/auth.ts
+++ b/src/lib/auth.ts
@@ -1,10 +1,8 @@
-/** Authentifizierung + Session, Muster aus dem Schulportal. */
-
-import type { Benutzer, BenutzerRolle } from '../types'
-
-export const SESSION_KEY = 'mp_benutzer_session'
-export const SESSION_DAUER_MS = 8 * 60 * 60 * 1000 // 8 h
-export const BENUTZER_CHANGED_EVENT = 'mp-benutzer-changed'
+/** Passwort-Hashing (wie bisher: SHA-256 im Browser, Vergleich serverseitig).
+ *
+ * Die Sitzung selbst liegt seit v1.3 serverseitig (HttpOnly-Cookie,
+ * Tabelle sessions) – es gibt nichts mehr im localStorage zu verwalten.
+ */
 
 /** Demo-Passwort aller Demo-Benutzer (wie Schulportal sha256("0815")). */
 export const DEMO_PASSWORT = '0815'
@@ -15,42 +13,3 @@ export async function sha256(text: string): Promise<string> {
     .map((b) => b.toString(16).padStart(2, '0'))
     .join('')
 }
-
-export interface Session {
-  benutzerId: string
-  rolle: BenutzerRolle
-  bis: number
-}
-
-export function ladeSession(): Session | null {
-  try {
-    const raw = localStorage.getItem(SESSION_KEY)
-    if (!raw) return null
-    const s = JSON.parse(raw) as Session
-    if (s.bis < Date.now()) {
-      localStorage.removeItem(SESSION_KEY)
-      return null
-    }
-    return s
-  } catch {
-    return null
-  }
-}
-
-export function speichereSession(benutzerId: string, rolle: BenutzerRolle) {
-  const s: Session = { benutzerId, rolle, bis: Date.now() + SESSION_DAUER_MS }
-  localStorage.setItem(SESSION_KEY, JSON.stringify(s))
-  window.dispatchEvent(new Event(BENUTZER_CHANGED_EVENT))
-}
-
-export function beendeSession() {
-  localStorage.removeItem(SESSION_KEY)
-  window.dispatchEvent(new Event(BENUTZER_CHANGED_EVENT))
-}
-
-export function aktuellerBenutzer(alle: Benutzer[]): Benutzer | null {
-  const s = ladeSession()
-  if (!s) return null
-  const b = alle.find((x) => x.id === s.benutzerId && x.aktiv)
-  return b ?? null
-}
diff --git a/src/lib/mail.ts b/src/lib/mail.ts
deleted file mode 100644
index 85b2025..0000000
--- a/src/lib/mail.ts
+++ /dev/null
@@ -1,64 +0,0 @@
-/** E-Mail-Benachrichtigungen über die Portal-Mail-API.
- *
- * Der Browser ruft nur denselben Ursprung an: POST /api/mail/send wird vom
- * Portal-nginx (Container mp-portal) an die Mail-API (mp-mail-api:8080)
- * weitergereicht und dabei serverseitig mit dem API-Token authentifiziert.
- * Das Token liegt also weder im Repo noch im JavaScript.
- *
- * Versand ist bewusst „fire-and-forget": Klappt der Versand nicht (Offline,
- * API down), bleibt die Portal-Aktion trotzdem erhalten – der Fehler landet
- * nur in der Browser-Konsole.
- */
-
-import type { Benutzer } from '../types'
-
-const ENDPUNKT = '/api/mail/send'
-
-export async function sendeMail(an: string, betreff: string, text: string): Promise<boolean> {
-  try {
-    const res = await fetch(ENDPUNKT, {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ to: an, subject: betreff, text }),
-    })
-    return res.ok
-  } catch {
-    return false
-  }
-}
-
-/** Fire-and-forget an eine oder mehrere Adressen (null/leer = nichts senden). */
-export function sendeBenachrichtigung(an: string | string[] | null | undefined, betreff: string, text: string) {
-  const adressen = (Array.isArray(an) ? an : an ? [an] : []).filter(Boolean)
-  for (const adresse of adressen) {
-    sendeMail(adresse, betreff, text).then((ok) => {
-      if (!ok) console.warn(`[mail] Versand an ${adresse} fehlgeschlagen`)
-    })
-  }
-}
-
-const FUSSZEILE =
-  '\n\n— Automatische Benachrichtigung aus dem Mieterportal der Hinterstein Immobilien'
-
-export function nachrichtenText(koerper: string): string {
-  return `${koerper}${FUSSZEILE}`
-}
-
-/** E-Mail-Adressen aller aktiven Verwaltungsbenutzer. */
-export function verwaltungsAdressen(benutzer: Benutzer[]): string[] {
-  return benutzer
-    .filter((b) => b.rolle === 'verwaltung' && b.aktiv && b.email)
-    .map((b) => b.email)
-}
-
-/** E-Mail-Adressen der Mieter einer bestimmten Wohnung. */
-export function mieterAdressenFuerEinheit(benutzer: Benutzer[], einheitId: string): string[] {
-  return benutzer
-    .filter((b) => b.rolle === 'mieter' && b.aktiv && b.einheitId === einheitId && b.email)
-    .map((b) => b.email)
-}
-
-/** Anzeigename einer Wohnung, z. B. „Hauptstraße 12, Whg. 7". */
-export function einheitLabel(einheit: { building: string; number: string }): string {
-  return `${einheit.building}, Whg. ${einheit.number}`
-}
diff --git a/src/pages/BenutzerVerwaltung.tsx b/src/pages/BenutzerVerwaltung.tsx
index 6ec2023..5133e29 100644
--- a/src/pages/BenutzerVerwaltung.tsx
+++ b/src/pages/BenutzerVerwaltung.tsx
@@ -215,7 +215,10 @@ export default function BenutzerVerwaltung() {
               ))}
             </select>
             <Button
-              onClick={() => generiereCodes(anzahl, codeEinheit || null)}
+              onClick={async () => {
+                const neu = await generiereCodes(anzahl, codeEinheit || null)
+                if (neu.length > 0) kopieren(neu[0].code)
+              }}
               className="gap-2 bg-amber-500 text-slate-900 hover:bg-amber-400"
             >
               <RefreshCcw className="h-4 w-4" /> Codes erzeugen
diff --git a/src/pages/Messages.tsx b/src/pages/Messages.tsx
index deef8e0..46d505c 100644
--- a/src/pages/Messages.tsx
+++ b/src/pages/Messages.tsx
@@ -13,71 +13,21 @@ import {
 } from '@/components/ui/dialog'
 import { Label } from '@/components/ui/label'
 import { useStore } from '../store/store'
-import {
-  sendeBenachrichtigung,
-  verwaltungsAdressen,
-  mieterAdressenFuerEinheit,
-  nachrichtenText,
-} from '../lib/mail'
-
-/** Gegenstelle benachrichtigen: Mieter → Verwaltung, Verwaltung → Mieter der Wohnung. */
-function benachrichtigeGegenstelle(opts: {
-  benutzer: ReturnType<typeof useStore>['benutzer']
-  vonRolle: 'tenant' | 'admin'
-  einheitId: string
-  betreff: string
-  text: string
-}) {
-  const adressen =
-    opts.vonRolle === 'tenant'
-      ? verwaltungsAdressen(opts.benutzer)
-      : mieterAdressenFuerEinheit(opts.benutzer, opts.einheitId)
-  sendeBenachrichtigung(adressen, opts.betreff, nachrichtenText(opts.text))
-}
 
 function NewMessageDialog({ onCreated }: { onCreated: (id: string) => void }) {
-  const { dispatch, role, me, meineEinheit, benutzer } = useStore()
+  const { newThread, role, meineEinheit } = useStore()
   const [open, setOpen] = useState(false)
   const [subject, setSubject] = useState('')
   const [text, setText] = useState('')
 
-  const verwaltungsName = 'Joseph Hinterstein'
-
-  const submit = () => {
+  const submit = async () => {
     if (!subject.trim() || !text.trim()) return
-    const id = `m-${Date.now()}`
-    const unitId = role === 'tenant' ? meineEinheit.id : 'hs-1'
-    const autor = role === 'tenant' ? (me?.name ?? 'Mieter') : verwaltungsName
-    dispatch({
-      type: 'newThread',
-      thread: {
-        id,
-        unitId,
-        tenant: autor,
-        subject: subject.trim(),
-        unreadByAdmin: true,
-        unreadByTenant: false,
-        messages: [
-          {
-            id: `${id}-1`,
-            from: role,
-            author: autor,
-            text: text.trim(),
-            at: new Date().toLocaleString('de-DE'),
-          },
-        ],
-      },
-    })
-    benachrichtigeGegenstelle({
-      benutzer,
-      vonRolle: role,
-      einheitId: unitId,
-      betreff:
-        role === 'tenant'
-          ? `Neue Nachricht im Mieterportal: ${subject.trim()}`
-          : `Nachricht der Verwaltung: ${subject.trim()}`,
-      text: `Neue Unterhaltung von ${autor}:\n\n„${text.trim()}“`,
-    })
+    const id = await newThread(
+      subject.trim(),
+      text.trim(),
+      role === 'tenant' ? meineEinheit.id : 'hs-1',
+    )
+    if (!id) return
     setSubject('')
     setText('')
     setOpen(false)
@@ -117,9 +67,7 @@ function NewMessageDialog({ onCreated }: { onCreated: (id: string) => void }) {
 }
 
 export default function Messages() {
-  const { threads, role, dispatch, units, me, meineEinheit, benutzer } = useStore()
-  const meinName = me?.name ?? 'Mieter'
-  const verwaltungsName = 'Joseph Hinterstein'
+  const { threads, role, units, meineEinheit, markThreadRead, addMessage } = useStore()
   const visible = role === 'tenant'
     ? threads.filter((t) => t.unitId === meineEinheit.id)
     : threads
@@ -130,35 +78,14 @@ export default function Messages() {
 
   useEffect(() => {
     if (!active) return
-    dispatch({ type: 'markThreadRead', threadId: active.id, role })
+    markThreadRead(active.id)
     bottomRef.current?.scrollIntoView({ behavior: 'smooth' })
-  }, [active?.id, active?.messages.length, dispatch, role])
+  }, [active?.id, active?.messages.length, markThreadRead, role])
 
-  const send = () => {
+  const send = async () => {
     if (!active || !draft.trim()) return
     const text = draft.trim()
-    const autor = role === 'tenant' ? meinName : verwaltungsName
-    dispatch({
-      type: 'addMessage',
-      threadId: active.id,
-      message: {
-        id: `${active.id}-${Date.now()}`,
-        from: role,
-        author: autor,
-        text,
-        at: new Date().toLocaleString('de-DE'),
-      },
-    })
-    benachrichtigeGegenstelle({
-      benutzer,
-      vonRolle: role,
-      einheitId: active.unitId,
-      betreff:
-        role === 'tenant'
-          ? `Neue Antwort im Mieterportal: ${active.subject}`
-          : `Antwort der Verwaltung: ${active.subject}`,
-      text: `Neue Nachricht von ${autor} in der Unterhaltung „${active.subject}“:\n\n„${text}“`,
-    })
+    await addMessage(active.id, text)
     setDraft('')
   }
 
diff --git a/src/pages/Tickets.tsx b/src/pages/Tickets.tsx
index 537ecca..b968544 100644
--- a/src/pages/Tickets.tsx
+++ b/src/pages/Tickets.tsx
@@ -13,12 +13,6 @@ import {
 import { Input } from '@/components/ui/input'
 import { Label } from '@/components/ui/label'
 import { Textarea } from '@/components/ui/textarea'
-import {
-  sendeBenachrichtigung,
-  verwaltungsAdressen,
-  nachrichtenText,
-  einheitLabel,
-} from '../lib/mail'
 import {
   Select,
   SelectContent,
@@ -52,45 +46,26 @@ const categories = [
 ]
 
 function NewTicketDialog() {
-  const { dispatch, role, me, meineEinheit, benutzer, units } = useStore()
+  const { addTicket, role, meineEinheit } = useStore()
   const [open, setOpen] = useState(false)
   const [title, setTitle] = useState('')
   const [category, setCategory] = useState('Sanitär')
   const [priority, setPriority] = useState<TicketPriority>('mittel')
   const [description, setDescription] = useState('')
+  const [sende, setSende] = useState(false)
 
-  const submit = () => {
-    if (!title.trim()) return
-    const unitId = role === 'tenant' ? meineEinheit.id : 'hs-1'
-    const einheit = units.find((u) => u.id === unitId) ?? meineEinheit
-    const mieterName = role === 'tenant' ? (me?.name ?? 'Mieter') : 'Hinterstein Immobilien (intern)'
-    dispatch({
-      type: 'addTicket',
-      ticket: {
-        id: `t-${Date.now()}`,
-        unitId,
-        tenant: mieterName,
-        title: title.trim(),
-        description: description.trim() || '–',
-        category,
-        priority,
-        status: 'offen',
-        createdAt: new Date().toLocaleDateString('de-DE'),
-      },
+  const submit = async () => {
+    if (!title.trim() || sende) return
+    setSende(true)
+    const err = await addTicket({
+      title: title.trim(),
+      description: description.trim() || '–',
+      category,
+      priority,
+      unitId: role === 'tenant' ? meineEinheit.id : 'hs-1',
     })
-    // Verwaltung per E-Mail benachrichtigen (fire-and-forget)
-    sendeBenachrichtigung(
-      verwaltungsAdressen(benutzer),
-      `Neue Schadensmeldung: ${title.trim()} (${einheitLabel(einheit)})`,
-      nachrichtenText(
-        `Im Mieterportal wurde eine neue Schadensmeldung erstellt.\n\n` +
-          `Wohnung: ${einheitLabel(einheit)}\n` +
-          `Meldung von: ${mieterName}\n` +
-          `Kategorie: ${category}\n` +
-          `Dringlichkeit: ${priority}\n\n` +
-          `${title.trim()}\n${description.trim() || '–'}`,
-      ),
-    )
+    setSende(false)
+    if (err) return
     setTitle('')
     setDescription('')
     setOpen(false)
@@ -158,7 +133,7 @@ function NewTicketDialog() {
         </div>
         <DialogFooter>
           <Button variant="outline" onClick={() => setOpen(false)}>Abbrechen</Button>
-          <Button onClick={submit} disabled={!title.trim()}>Meldung absenden</Button>
+          <Button onClick={submit} disabled={!title.trim() || sende}>{sende ? 'Wird gesendet …' : 'Meldung absenden'}</Button>
         </DialogFooter>
       </DialogContent>
     </Dialog>
@@ -166,7 +141,7 @@ function NewTicketDialog() {
 }
 
 export default function Tickets() {
-  const { tickets, units, role, dispatch, meineEinheit } = useStore()
+  const { tickets, units, role, setTicketStatus, meineEinheit } = useStore()
   const [filter, setFilter] = useState<'alle' | TicketStatus>('alle')
 
   const visible = useMemo(
@@ -247,9 +222,7 @@ export default function Tickets() {
                     {role === 'admin' ? (
                       <Select
                         value={t.status}
-                        onValueChange={(v) =>
-                          dispatch({ type: 'setTicketStatus', id: t.id, status: v as TicketStatus })
-                        }
+                        onValueChange={(v) => setTicketStatus(t.id, v as TicketStatus)}
                       >
                         <SelectTrigger className="h-8 w-40">
                           <SelectValue />
diff --git a/src/store/store.tsx b/src/store/store.tsx
index c0abc58..eefab5e 100644
--- a/src/store/store.tsx
+++ b/src/store/store.tsx
@@ -1,240 +1,72 @@
+/** Zentraler Store des Mieterportals – seit v1.3 komplett serverseitig
+ * (Node-API + PostgreSQL). Der Browser hält keine Mietdaten mehr im
+ * localStorage; die Sitzung läuft über ein HttpOnly-Cookie (8 h).
+ *
+ * Das Store-Interface bleibt absichtlich nahe an der bisherigen Form, damit
+ * die Seiten nur minimal angepasst werden mussten: Lesezugriff synchron über
+ * den State, Schreibzugriff über asynchrone Methoden (rufen die API auf und
+ * aktualisieren danach den lokalen State aus der Antwort/Neuladung).
+ */
+
 import {
   createContext,
+  useCallback,
   useContext,
   useEffect,
   useMemo,
-  useReducer,
+  useState,
   type ReactNode,
 } from 'react'
 import type {
   Role,
   Ticket,
+  TicketStatus,
   Transaction,
   DocumentItem,
   Thread,
-  Message,
   Benutzer,
   BenutzerRolle,
   RegistrierungsCode,
+  Unit,
+  Announcement,
 } from '../types'
-import {
-  units,
-  transactions,
-  tickets,
-  documents,
-  threads,
-  announcements,
-  DEMO_TENANT,
-  DEMO_UNIT_ID,
-} from '../data/seed'
-import {
-  sha256,
-  DEMO_PASSWORT,
-  ladeSession,
-  speichereSession,
-  beendeSession,
-  type Session,
-} from '../lib/auth'
+import { apiGet, apiPost, apiPatch, ApiFehler } from '../lib/api'
+import { sha256, DEMO_PASSWORT } from '../lib/auth'
 
-const DEMO_HASH = 'c57a5df4f97ed6914116e5fd1348406064834f22503d890eb571af442ac4b4c3' // sha256("0815")
+/** Demo-Einheit als Fallback, falls ein Mieter noch keine Wohnung zugewiesen hat. */
+export const DEMO_TENANT = 'Anna Berger'
+export const DEMO_UNIT_ID = 'hs-7'
 
-/** Demo-Benutzer (Passwort aller: 0815). */
-export const demoBenutzer: Benutzer[] = [
-  {
-    id: 'b-joseph',
-    benutzername: 'j.hinterstein',
-    name: 'Joseph Hinterstein',
-    passwortHash: DEMO_HASH,
-    rolle: 'verwaltung',
-    email: 'joseph@hinterstein-immo.de',
-    einheitId: null,
-    aktiv: true,
-    erstelltAm: '01.03.2024',
-  },
-  {
-    id: 'b-anna',
-    benutzername: 'a.berger',
-    name: DEMO_TENANT,
-    passwortHash: DEMO_HASH,
-    rolle: 'mieter',
-    email: 'anna.berger@example.de',
-    einheitId: DEMO_UNIT_ID,
-    aktiv: true,
-    erstelltAm: '01.03.2024',
-    letzterLogin: '02.10.2026, 09:12',
-  },
-  {
-    id: 'b-jonas',
-    benutzername: 'm.wolf',
-    name: 'Jonas Klein',
-    passwortHash: DEMO_HASH,
-    rolle: 'mieter',
-    email: 'jonas.klein@example.de',
-    einheitId: 'rw-4',
-    aktiv: true,
-    erstelltAm: '15.08.2025',
-  },
-]
-
-/** Demo-Registrierungscode (Verwaltung kann weitere erzeugen). */
-const demoCodes: RegistrierungsCode[] = [
-  {
-    code: 'MP-2026-0815',
-    einheitId: 'ap-2',
-    erstelltAm: '02.10.2026',
-  },
-]
-
-interface State {
-  tickets: Ticket[]
+interface Bootstrap {
+  units: Unit[]
   transactions: Transaction[]
   documents: DocumentItem[]
+  tickets: Ticket[]
   threads: Thread[]
+  announcements: Announcement[]
   benutzer: Benutzer[]
   codes: RegistrierungsCode[]
-  session: Session | null
-  tick: number
 }
 
-type Action =
-  | { type: 'addTicket'; ticket: Ticket }
-  | { type: 'setTicketStatus'; id: string; status: Ticket['status'] }
-  | { type: 'addMessage'; threadId: string; message: Message }
-  | { type: 'newThread'; thread: Thread }
-  | { type: 'markThreadRead'; threadId: string; role: Role }
-  | { type: 'setSession'; session: Session | null }
-  | { type: 'registriert'; benutzer: Benutzer; code: string }
-  | { type: 'benutzerAngelegt'; benutzer: Benutzer }
-  | { type: 'benutzerAktiv'; id: string; aktiv: boolean }
-  | { type: 'passwortGesetzt'; id: string; hash: string }
-  | { type: 'einheitZugewiesen'; id: string; einheitId: string | null }
-  | { type: 'codesHinzugefuegt'; codes: RegistrierungsCode[] }
-
-const initialState: State = {
-  tickets,
-  transactions,
-  documents,
-  threads,
-  benutzer: demoBenutzer,
-  codes: demoCodes,
-  session: ladeSession(),
-  tick: 0,
+const LEER: Bootstrap = {
+  units: [],
+  transactions: [],
+  documents: [],
+  tickets: [],
+  threads: [],
+  announcements: [],
+  benutzer: [],
+  codes: [],
 }
 
-const STORAGE_KEY = 'hinterstein-mieterportal-v2'
-
-function loadState(): State {
-  try {
-    const raw = localStorage.getItem(STORAGE_KEY)
-    if (raw) {
-      const parsed = JSON.parse(raw)
-      return { ...initialState, ...parsed, session: ladeSession() }
-    }
-  } catch {
-    /* ignore */
-  }
-  return initialState
-}
-
-function reducer(state: State, action: Action): State {
-  switch (action.type) {
-    case 'addTicket':
-      return { ...state, tickets: [action.ticket, ...state.tickets] }
-    case 'setTicketStatus':
-      return {
-        ...state,
-        tickets: state.tickets.map((t) =>
-          t.id === action.id ? { ...t, status: action.status } : t,
-        ),
-      }
-    case 'addMessage':
-      return {
-        ...state,
-        threads: state.threads.map((th) =>
-          th.id === action.threadId
-            ? {
-                ...th,
-                unreadByAdmin: action.message.from === 'tenant',
-                unreadByTenant: action.message.from === 'admin',
-                messages: [...th.messages, action.message],
-              }
-            : th,
-        ),
-      }
-    case 'newThread':
-      return { ...state, threads: [action.thread, ...state.threads] }
-    case 'markThreadRead':
-      return {
-        ...state,
-        threads: state.threads.map((th) =>
-          th.id === action.threadId
-            ? action.role === 'tenant'
-              ? { ...th, unreadByTenant: false }
-              : { ...th, unreadByAdmin: false }
-            : th,
-        ),
-      }
-    case 'setSession':
-      return { ...state, session: action.session, tick: state.tick + 1 }
-    case 'registriert':
-      return {
-        ...state,
-        benutzer: [...state.benutzer, action.benutzer],
-        codes: state.codes.map((c) =>
-          c.code === action.code ? { ...c, verwendetAm: new Date().toLocaleDateString('de-DE') } : c,
-        ),
-      }
-    case 'benutzerAngelegt':
-      return { ...state, benutzer: [...state.benutzer, action.benutzer] }
-    case 'benutzerAktiv':
-      return {
-        ...state,
-        benutzer: state.benutzer.map((b) =>
-          b.id === action.id ? { ...b, aktiv: action.aktiv } : b,
-        ),
-      }
-    case 'passwortGesetzt':
-      return {
-        ...state,
-        benutzer: state.benutzer.map((b) =>
-          b.id === action.id ? { ...b, passwortHash: action.hash } : b,
-        ),
-      }
-    case 'einheitZugewiesen':
-      return {
-        ...state,
-        benutzer: state.benutzer.map((b) =>
-          b.id === action.id ? { ...b, einheitId: action.einheitId } : b,
-        ),
-      }
-    case 'codesHinzugefuegt':
-      return { ...state, codes: [...action.codes, ...state.codes] }
-    default:
-      return state
-  }
-}
-
-function neuerCode(): string {
-  const teile = () =>
-    Array.from(crypto.getRandomValues(new Uint8Array(2)))
-      .map((b) => b.toString(16).padStart(2, '0'))
-      .join('')
-      .toUpperCase()
-  return `MP-${teile()}-${teile()}`
-}
-
-interface Store extends State {
-  dispatch: React.Dispatch<Action>
-  units: typeof units
-  announcements: typeof announcements
-  /** Aktuell angemeldeter Benutzer (null = nicht eingeloggt). */
+interface Store extends Bootstrap {
+  /** Erster /api/auth/me-Lauf ist abgeschlossen (sonst Ladebildschirm). */
+  bereit: boolean
   me: Benutzer | null
-  /** Abgeleitete Portal-Rolle für die Modul-Ansichten. */
   role: Role
-  /** Einheit des angemeldeten Mieters (Demo-Fallback hs-7). */
-  meineEinheit: (typeof units)[number]
+  meineEinheit: Unit
   login: (benutzername: string, passwort: string) => Promise<string | null>
-  logout: () => void
+  logout: () => Promise<void>
   registrieren: (
     code: string,
     benutzername: string,
@@ -242,6 +74,11 @@ interface Store extends State {
     email: string,
     passwort: string,
   ) => Promise<string | null>
+  addTicket: (t: { title: string; description: string; category: string; priority: string; unitId?: string }) => Promise<string | null>
+  setTicketStatus: (id: string, status: TicketStatus) => Promise<void>
+  newThread: (subject: string, text: string, unitId?: string) => Promise<string | null>
+  addMessage: (threadId: string, text: string) => Promise<void>
+  markThreadRead: (threadId: string) => void
   benutzerAnlegen: (
     benutzername: string,
     name: string,
@@ -250,136 +87,179 @@ interface Store extends State {
     passwort: string,
     einheitId: string | null,
   ) => Promise<string | null>
-  setAktiv: (id: string, aktiv: boolean) => void
+  setAktiv: (id: string, aktiv: boolean) => Promise<void>
   setPasswort: (id: string, passwort: string) => Promise<void>
-  weiseEinheitZu: (id: string, einheitId: string | null) => void
-  generiereCodes: (anzahl: number, einheitId: string | null) => RegistrierungsCode[]
+  weiseEinheitZu: (id: string, einheitId: string | null) => Promise<void>
+  generiereCodes: (anzahl: number, einheitId: string | null) => Promise<RegistrierungsCode[]>
 }
 
 const StoreContext = createContext<Store | null>(null)
 
 export function StoreProvider({ children }: { children: ReactNode }) {
-  const [state, dispatch] = useReducer(reducer, undefined, loadState)
+  const [bereit, setBereit] = useState(false)
+  const [me, setMe] = useState<Benutzer | null>(null)
+  const [daten, setDaten] = useState<Bootstrap>(LEER)
 
+  /** Lädt alle Stammdaten neu (nach Login/Registrierung und nach Schreibaktionen). */
+  const ladeAlles = useCallback(async () => {
+    const b = await apiGet<Bootstrap>('/api/bootstrap')
+    setDaten(b)
+  }, [])
+
+  // Start: bestehende Session prüfen, dann Daten laden
   useEffect(() => {
-    localStorage.setItem(STORAGE_KEY, JSON.stringify(state))
-  }, [state])
-
-  const value = useMemo<Store>(() => {
-    const me =
-      (state.session &&
-        state.benutzer.find((b) => b.id === state.session!.benutzerId && b.aktiv)) ||
-      null
-    const role: Role = me?.rolle === 'verwaltung' ? 'admin' : 'tenant'
-    const meineEinheit =
-      units.find((u) => u.id === (me?.einheitId ?? DEMO_UNIT_ID)) ??
-      units.find((u) => u.id === DEMO_UNIT_ID)!
-
-    const login = async (benutzername: string, passwort: string) => {
-      const b = state.benutzer.find(
-        (x) => x.benutzername.toLowerCase() === benutzername.trim().toLowerCase(),
-      )
-      if (!b) return 'Benutzername oder Passwort falsch.'
-      if (!b.aktiv) return 'Dieses Konto ist deaktiviert – bitte die Verwaltung kontaktieren.'
-      if ((await sha256(passwort)) !== b.passwortHash)
-        return 'Benutzername oder Passwort falsch.'
-      speichereSession(b.id, b.rolle)
-      dispatch({ type: 'setSession', session: ladeSession() })
-      return null
-    }
-
-    const logout = () => {
-      beendeSession()
-      dispatch({ type: 'setSession', session: null })
-    }
-
-    const registrieren = async (
-      code: string,
-      benutzername: string,
-      name: string,
-      email: string,
-      passwort: string,
-    ) => {
-      const c = state.codes.find(
-        (x) => x.code.toUpperCase() === code.trim().toUpperCase() && !x.verwendetAm,
-      )
-      if (!c) return 'Der Registrierungscode ist ungültig oder bereits verwendet.'
-      if (state.benutzer.some((x) => x.benutzername.toLowerCase() === benutzername.trim().toLowerCase()))
-        return 'Dieser Benutzername ist bereits vergeben.'
-      const b: Benutzer = {
-        id: `b-${Date.now()}`,
-        benutzername: benutzername.trim(),
-        name: name.trim(),
-        passwortHash: await sha256(passwort),
-        rolle: 'mieter',
-        email: email.trim(),
-        einheitId: c.einheitId,
-        aktiv: true,
-        erstelltAm: new Date().toLocaleDateString('de-DE'),
+    let aktiv = true
+    ;(async () => {
+      try {
+        const { benutzer } = await apiGet<{ benutzer: Benutzer }>('/api/auth/me')
+        if (!aktiv) return
+        setMe(benutzer)
+        await ladeAlles()
+      } catch {
+        /* nicht angemeldet – Login-Seite zeigen */
+      } finally {
+        if (aktiv) setBereit(true)
       }
-      dispatch({ type: 'registriert', benutzer: b, code: c.code })
-      speichereSession(b.id, b.rolle)
-      dispatch({ type: 'setSession', session: ladeSession() })
-      return null
+    })()
+    return () => {
+      aktiv = false
     }
+  }, [ladeAlles])
 
-    const benutzerAnlegen = async (
-      benutzername: string,
-      name: string,
-      rolle: BenutzerRolle,
-      email: string,
-      passwort: string,
-      einheitId: string | null,
-    ) => {
-      if (state.benutzer.some((x) => x.benutzername.toLowerCase() === benutzername.trim().toLowerCase()))
-        return 'Dieser Benutzername ist bereits vergeben.'
-      const b: Benutzer = {
-        id: `b-${Date.now()}`,
-        benutzername: benutzername.trim(),
-        name: name.trim(),
-        passwortHash: await sha256(passwort),
-        rolle,
-        email: email.trim(),
-        einheitId: rolle === 'mieter' ? einheitId : null,
-        aktiv: true,
-        erstelltAm: new Date().toLocaleDateString('de-DE'),
+  const role: Role = me?.rolle === 'verwaltung' ? 'admin' : 'tenant'
+  const meineEinheit =
+    daten.units.find((u) => u.id === (me?.einheitId ?? DEMO_UNIT_ID)) ??
+    daten.units.find((u) => u.id === DEMO_UNIT_ID) ??
+    daten.units[0]
+
+  const fehlerNachricht = (e: unknown): string =>
+    e instanceof ApiFehler ? e.message : 'Ein unerwarteter Fehler ist aufgetreten.'
+
+  const value = useMemo<Store>(() => ({
+    ...daten,
+    bereit,
+    me,
+    role,
+    meineEinheit,
+    // ── Auth ────────────────────────────────────────────────
+    async login(benutzername, passwort) {
+      try {
+        const { benutzer } = await apiPost<{ benutzer: Benutzer }>('/api/auth/login', {
+          benutzername,
+          passwortHash: await sha256(passwort),
+        })
+        setMe(benutzer)
+        await ladeAlles()
+        return null
+      } catch (e) {
+        return fehlerNachricht(e)
       }
-      dispatch({ type: 'benutzerAngelegt', benutzer: b })
-      return null
-    }
-
-    const setPasswort = async (id: string, passwort: string) => {
-      dispatch({ type: 'passwortGesetzt', id, hash: await sha256(passwort) })
-    }
-
-    const generiereCodes = (anzahl: number, einheitId: string | null) => {
-      const neu: RegistrierungsCode[] = Array.from({ length: anzahl }, () => ({
-        code: neuerCode(),
-        einheitId,
-        erstelltAm: new Date().toLocaleDateString('de-DE'),
+    },
+    async logout() {
+      try {
+        await apiPost('/api/auth/logout')
+      } catch {
+        /* Session ggf. bereits ungültig – trotzdem lokal abmelden */
+      }
+      setMe(null)
+      setDaten(LEER)
+    },
+    async registrieren(code, benutzername, name, email, passwort) {
+      try {
+        const { benutzer } = await apiPost<{ benutzer: Benutzer }>('/api/auth/register', {
+          code,
+          benutzername,
+          name,
+          email,
+          passwortHash: await sha256(passwort),
+        })
+        setMe(benutzer)
+        await ladeAlles()
+        return null
+      } catch (e) {
+        return fehlerNachricht(e)
+      }
+    },
+    // ── Schadensmeldungen ───────────────────────────────────
+    async addTicket(t) {
+      try {
+        await apiPost('/api/tickets', t)
+        await ladeAlles()
+        return null
+      } catch (e) {
+        return fehlerNachricht(e)
+      }
+    },
+    async setTicketStatus(id, status) {
+      const { ticket } = await apiPatch<{ ticket: Ticket }>(`/api/tickets/${id}`, { status })
+      setDaten((d) => ({ ...d, tickets: d.tickets.map((t) => (t.id === id ? ticket : t)) }))
+    },
+    // ── Nachrichten ─────────────────────────────────────────
+    async newThread(subject, text, unitId) {
+      try {
+        const { thread } = await apiPost<{ thread: Thread }>('/api/threads', { subject, text, unitId })
+        setDaten((d) => ({ ...d, threads: [thread, ...d.threads.filter((t) => t.id !== thread.id)] }))
+        return thread.id
+      } catch (e) {
+        console.error(fehlerNachricht(e))
+        return null
+      }
+    },
+    async addMessage(threadId, text) {
+      const { thread } = await apiPost<{ thread: Thread }>(`/api/threads/${threadId}/messages`, { text })
+      setDaten((d) => ({ ...d, threads: d.threads.map((t) => (t.id === threadId ? thread : t)) }))
+    },
+    markThreadRead(threadId) {
+      // Optimistisch lokal markieren, serverseitig nachmelden
+      setDaten((d) => ({
+        ...d,
+        threads: d.threads.map((t) =>
+          t.id === threadId
+            ? role === 'tenant'
+              ? { ...t, unreadByTenant: false }
+              : { ...t, unreadByAdmin: false }
+            : t,
+        ),
       }))
-      dispatch({ type: 'codesHinzugefuegt', codes: neu })
-      return neu
-    }
-
-    return {
-      ...state,
-      dispatch,
-      units,
-      announcements,
-      me,
-      role,
-      meineEinheit,
-      login,
-      logout,
-      registrieren,
-      benutzerAnlegen,
-      setAktiv: (id, aktiv) => dispatch({ type: 'benutzerAktiv', id, aktiv }),
-      setPasswort,
-      weiseEinheitZu: (id, einheitId) => dispatch({ type: 'einheitZugewiesen', id, einheitId }),
-      generiereCodes,
-    }
-  }, [state])
+      apiPost(`/api/threads/${threadId}/read`).catch(() => {})
+    },
+    // ── Benutzerverwaltung (Verwaltung) ─────────────────────
+    async benutzerAnlegen(benutzername, name, rolle, email, passwort, einheitId) {
+      try {
+        await apiPost('/api/users', {
+          benutzername,
+          name,
+          rolle,
+          email,
+          einheitId,
+          passwortHash: await sha256(passwort),
+        })
+        await ladeAlles()
+        return null
+      } catch (e) {
+        return fehlerNachricht(e)
+      }
+    },
+    async setAktiv(id, aktiv) {
+      const { benutzer } = await apiPatch<{ benutzer: Benutzer }>(`/api/users/${id}`, { aktiv })
+      setDaten((d) => ({ ...d, benutzer: d.benutzer.map((b) => (b.id === id ? benutzer : b)) }))
+    },
+    async setPasswort(id, passwort) {
+      const { benutzer } = await apiPatch<{ benutzer: Benutzer }>(`/api/users/${id}`, {
+        passwortHash: await sha256(passwort),
+      })
+      setDaten((d) => ({ ...d, benutzer: d.benutzer.map((b) => (b.id === id ? benutzer : b)) }))
+    },
+    async weiseEinheitZu(id, einheitId) {
+      const { benutzer } = await apiPatch<{ benutzer: Benutzer }>(`/api/users/${id}`, { einheitId })
+      setDaten((d) => ({ ...d, benutzer: d.benutzer.map((b) => (b.id === id ? benutzer : b)) }))
+    },
+    async generiereCodes(anzahl, einheitId) {
+      const { codes } = await apiPost<{ codes: RegistrierungsCode[] }>('/api/codes', { anzahl, einheitId })
+      await ladeAlles()
+      return codes
+    },
+  }), [daten, bereit, me, role, meineEinheit, ladeAlles])
 
   return <StoreContext.Provider value={value}>{children}</StoreContext.Provider>
 }
@@ -395,4 +275,4 @@ export const fmtEUR = new Intl.NumberFormat('de-DE', {
   currency: 'EUR',
 })
 
-export { DEMO_TENANT, DEMO_UNIT_ID, DEMO_PASSWORT }
+export { DEMO_PASSWORT }
diff --git a/vite.config.ts b/vite.config.ts
index d55fe45..5caaf03 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -9,6 +9,14 @@ export default defineConfig({
   plugins: [inspectAttr(), react()],
   server: {
     port: 3000,
+    proxy: {
+      // Dev-Server: API-Anfragen an die lokale mp-api weiterreichen
+      // (Produktion: nginx des mp-portal-Containers proxiet /api/ an mp-api)
+      '/api': {
+        target: 'http://localhost:3001',
+        changeOrigin: true,
+      },
+    },
   },
   resolve: {
     alias: {