diff --git a/install.sh b/install.sh
index 2326256..f5589ad 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 # archivmail Installer
-# Unterstützte Systeme: Debian 12 / 13
+# Unterstütztes System: Debian 13 (trixie)
 #
 # Aufruf:
 #   bash install.sh                          # Interaktiv (Modus-Auswahl)
@@ -18,6 +18,13 @@ die()  { echo -e "${RED}[ERR]${NC} $*" >&2; exit 1; }
 
 [[ $EUID -eq 0 ]] || die "Bitte als root ausführen: sudo bash install.sh"
 
+# ── OS-Prüfung: nur Debian 13 (trixie) ──────────────────────────────────────
+_os_id=$(. /etc/os-release 2>/dev/null && echo "$ID" || echo "")
+_os_ver=$(. /etc/os-release 2>/dev/null && echo "$VERSION_ID" || echo "")
+[[ "$_os_id" == "debian" && "$_os_ver" == "13" ]] \
+    || die "Nur Debian 13 (trixie) wird unterstützt (erkannt: ${_os_id} ${_os_ver})"
+log "Debian 13 erkannt"
+
 # ── Gemeinsame Variablen ──────────────────────────────────────────────────────
 DB_PASSWORD="${DB_PASSWORD:-$(openssl rand -base64 24 | tr -dc 'a-zA-Z0-9' | head -c 32)}"
 API_SECRET="${API_SECRET:-$(openssl rand -base64 48 | tr -dc 'a-zA-Z0-9' | head -c 64)}"
@@ -375,26 +382,41 @@ EOF
 # ══════════════════════════════════════════════════════════════════════════════
 install_native() {
 
-    # ── 1. Pakete ─────────────────────────────────────────────────────────────
+    # ── 1. Basispakete (kein golang-go — zu alt in Debian-Repos) ────────────
     info "Installiere Systempakete..."
     apt-get update -qq
     apt-get install -y -qq \
-        golang-go nodejs npm postgresql nginx \
-        curl git rsync logrotate openssl
+        nodejs npm postgresql nginx \
+        curl wget git rsync logrotate openssl ca-certificates
     log "Pakete installiert"
 
-    # ── 1b. Manticore Search ──────────────────────────────────────────────────
+    # ── 1b. Go 1.24 von upstream (apt-Paket ist zu alt) ──────────────────────
+    GO_VERSION="1.24.4"
+    info "Installiere Go ${GO_VERSION} von upstream..."
+    if /usr/local/go/bin/go version 2>/dev/null | grep -q "go${GO_VERSION}"; then
+        log "Go ${GO_VERSION} bereits installiert"
+    else
+        _go_arch="amd64"
+        [[ "$(dpkg --print-architecture)" == "arm64" ]] && _go_arch="arm64"
+        curl -fsSL "https://dl.google.com/go/go${GO_VERSION}.linux-${_go_arch}.tar.gz" \
+            | tar -C /usr/local -xz
+        log "Go $(/usr/local/go/bin/go version | awk '{print $3}') installiert"
+    fi
+    export PATH="$PATH:/usr/local/go/bin"
+    ln -sf /usr/local/go/bin/go    /usr/local/bin/go
+    ln -sf /usr/local/go/bin/gofmt /usr/local/bin/gofmt
+
+    # ── 1c. Manticore Search ──────────────────────────────────────────────────
     info "Installiere Manticore Search..."
     if ! command -v searchd >/dev/null 2>&1 && ! systemctl is-active --quiet manticore 2>/dev/null; then
-        apt-get install -y -qq wget gnupg2 lsb-release 2>/dev/null || true
-        MANTICORE_CODENAME=$(lsb_release -cs 2>/dev/null || echo "bookworm")
+        # Manticore hat kein natives trixie-Paket — bookworm-Paket ist kompatibel
         wget -q -O /tmp/manticore.deb \
-            "https://repo.manticoresearch.com/repository/manticoresearch_${MANTICORE_CODENAME}/pool/main/m/manticoresearch/manticoresearch_6.3.6_amd64.deb" 2>/dev/null \
+            "https://repo.manticoresearch.com/repository/manticoresearch_bookworm/pool/main/m/manticoresearch/manticoresearch_6.3.6_amd64.deb" 2>/dev/null \
             || wget -q -O /tmp/manticore.deb \
-               "https://github.com/manticoresoftware/manticoresearch/releases/download/6.3.6/manticoresearch_6.3.6.202408011246.4c39781ba-1+${MANTICORE_CODENAME}_amd64.deb" 2>/dev/null \
+               "https://github.com/manticoresoftware/manticoresearch/releases/download/6.3.6/manticoresearch_6.3.6.202408011246.4c39781ba-1+bookworm_amd64.deb" 2>/dev/null \
             || true
         if [[ -f /tmp/manticore.deb ]]; then
-            dpkg -i /tmp/manticore.deb 2>/dev/null || apt-get install -f -y 2>/dev/null || true
+            dpkg -i /tmp/manticore.deb 2>/dev/null || apt-get install -f -y -qq 2>/dev/null || true
             rm -f /tmp/manticore.deb
             log "Manticore Search installiert"
         else
@@ -406,15 +428,6 @@ install_native() {
     systemctl enable --now manticore 2>/dev/null || warn "Manticore-Dienst konnte nicht gestartet werden"
     systemctl is-active --quiet manticore && log "Manticore Search läuft"
 
-    # go im PATH sicherstellen (Debian legt binary nicht immer in /usr/bin)
-    if ! command -v go >/dev/null 2>&1; then
-        GO_BIN=$(find /usr/lib/go-*/bin /usr/local/go/bin -name "go" 2>/dev/null | head -1)
-        [[ -n "$GO_BIN" ]] || die "go binary nicht gefunden nach Installation"
-        ln -sf "$GO_BIN" /usr/local/bin/go
-        log "go binary verlinkt: $GO_BIN → /usr/local/bin/go"
-    fi
-    log "go $(go version | awk '{print $3}')"
-
     # ── 2. Systembenutzer ─────────────────────────────────────────────────────
     info "Lege Systembenutzer '$AM_USER' an..."
     id "$AM_USER" &>/dev/null \
@@ -514,6 +527,10 @@ index:
   backend: manticore
   manticore_dsn: "manticore@tcp(127.0.0.1:9306)/"
   batch_size: 100
+  batch_mode: true
+
+ocr:
+  batch_mode: true
 
 audit:
   log_path: ${LOG_DIR}/audit.log
@@ -660,7 +677,6 @@ WorkingDirectory=${INSTALL_DIR}/web
 ExecStart=/usr/bin/node server.js
 Environment=NODE_ENV=production
 Environment=PORT=3000
-Environment=NEXT_PUBLIC_API_URL=http://127.0.0.1:8080
 Restart=on-failure
 RestartSec=5
 StandardOutput=journal
diff --git a/update.sh b/update.sh
index f428fb4..13fd96f 100755
--- a/update.sh
+++ b/update.sh
@@ -54,12 +54,11 @@ command -v go   >/dev/null || die "go nicht gefunden — apt-get install golang-
 
 if ! command -v searchd >/dev/null 2>&1 && ! systemctl is-active --quiet manticore 2>/dev/null; then
   info "Manticore Search nicht gefunden — installiere..."
-  apt-get install -y wget gnupg2 lsb-release 2>/dev/null || true
-  MANTICORE_CODENAME=$(lsb_release -cs 2>/dev/null || echo "bookworm")
+  # bookworm-Paket auf trixie verwenden (kein natives trixie-Paket verfügbar)
   wget -q -O /tmp/manticore.deb \
-    "https://repo.manticoresearch.com/repository/manticoresearch_${MANTICORE_CODENAME}/pool/main/m/manticoresearch/manticoresearch_6.3.6_amd64.deb" 2>/dev/null \
+    "https://repo.manticoresearch.com/repository/manticoresearch_bookworm/pool/main/m/manticoresearch/manticoresearch_6.3.6_amd64.deb" 2>/dev/null \
     || wget -q -O /tmp/manticore.deb \
-       "https://github.com/manticoresoftware/manticoresearch/releases/download/6.3.6/manticoresearch_6.3.6.202408011246.4c39781ba-1+${MANTICORE_CODENAME}_amd64.deb" 2>/dev/null \
+       "https://github.com/manticoresoftware/manticoresearch/releases/download/6.3.6/manticoresearch_6.3.6.202408011246.4c39781ba-1+bookworm_amd64.deb" 2>/dev/null \
     || true
   if [[ -f /tmp/manticore.deb ]]; then
     dpkg -i /tmp/manticore.deb 2>/dev/null || apt-get install -f -y 2>/dev/null || true