diff --git a/CHANGELOG.md b/CHANGELOG.md
index fedb838..bb4ded8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## [6.0.11] - 2026-04-10
+
+### Fixed
+- **Idempotenter Bun-Installer** — `install.sh` und `install.bat` bereinigen vor `bun add -g file:...` jetzt vorhandene `ttdash`-Einträge aus Bun’s globalem Manifest und löschen bei Bedarf das fehlerhafte globale `bun.lock`, damit wiederholte Upgrades keine doppelten `package.json`-Keys mehr erzeugen
+
 ## [6.0.10] - 2026-04-09
 
 ### Added
diff --git a/install.bat b/install.bat
index bec1387..3124e3d 100644
--- a/install.bat
+++ b/install.bat
@@ -1,11 +1,15 @@
 @echo off
 setlocal enabledelayedexpansion
+set "SCRIPT_DIR=%~dp0"
+cd /d "%SCRIPT_DIR%" || exit /b 1
 set "INSTALL_TOOL=npm"
 set "BUILD_TOOL=npm"
 set "GLOBAL_TOOL=npm"
 set "APP_VERSION=unbekannt"
+set "APP_NAME=ttdash"
 
 for /f "usebackq delims=" %%v in (`powershell -NoProfile -Command "(Get-Content -Raw 'package.json' | ConvertFrom-Json).version"`) do set "APP_VERSION=%%v"
+for /f "usebackq delims=" %%n in (`powershell -NoProfile -Command "(Get-Content -Raw 'package.json' | ConvertFrom-Json).name"`) do set "APP_NAME=%%n"
 
 echo.
 echo  ttdash v%APP_VERSION% installer
@@ -70,6 +74,18 @@ echo    √ Build abgeschlossen (dist/)
 echo.
 echo  [3/3] Installiere global...
 if /i "%GLOBAL_TOOL%"=="bun" (
+    for /f "usebackq delims=" %%p in (`bun pm bin -g 2^>nul`) do set "BUN_GLOBAL_BIN=%%p"
+    if defined BUN_GLOBAL_BIN (
+        for %%d in ("%BUN_GLOBAL_BIN%\..") do set "BUN_ROOT=%%~fd"
+        set "BUN_GLOBAL_PACKAGE_JSON=%BUN_ROOT%\install\global\package.json"
+        set "BUN_GLOBAL_LOCKFILE=%BUN_ROOT%\install\global\bun.lock"
+        set "BUN_CLEANUP_STATUS="
+        for /f "usebackq delims=" %%s in (`bun --eval "const fs = require('fs'); const file = process.env.BUN_GLOBAL_PACKAGE_JSON; const name = process.env.APP_NAME; if (!file || !fs.existsSync(file)) { console.log('clean'); process.exit(0); } const raw = fs.readFileSync(file, 'utf8'); const parsed = JSON.parse(raw); const deps = { ...(parsed.dependencies || {}) }; const hadEntry = Object.prototype.hasOwnProperty.call(deps, name); if (hadEntry) { delete deps[name]; } const next = { ...parsed }; if (Object.keys(deps).length > 0) { next.dependencies = deps; } else { delete next.dependencies; } const normalized = JSON.stringify(next, null, 2) + '\n'; const normalizedChanged = raw !== normalized; if (normalizedChanged || hadEntry) { fs.writeFileSync(file, normalized); } if (hadEntry) { console.log('removed'); } else if (normalizedChanged) { console.log('normalized'); } else { console.log('clean'); }" 2^>nul`) do set "BUN_CLEANUP_STATUS=%%s"
+        if /i not "!BUN_CLEANUP_STATUS!"=="clean" (
+            if exist "%BUN_GLOBAL_LOCKFILE%" del /f /q "%BUN_GLOBAL_LOCKFILE%" >nul 2>&1
+            echo    - Vorhandenen Bun-Globaleintrag fuer %APP_NAME% bereinigt
+        )
+    )
     echo    - Versuche bun add -g file:%cd%
     call bun add -g file:%cd% >nul 2>&1
     if !errorlevel! neq 0 (
diff --git a/install.sh b/install.sh
index 3458680..f12fd65 100755
--- a/install.sh
+++ b/install.sh
@@ -13,19 +13,95 @@ step=0
 total=3
 install_tool="npm"
 global_tool="npm"
-version="$(sed -n 's/.*"version": "\(.*\)".*/\1/p' package.json | head -1)"
+script_source="${BASH_SOURCE[0]:-$0}"
+script_dir="$(cd "$(dirname "$script_source")" && pwd)"
+manifest_file="$script_dir/package.json"
+version="$(sed -n 's/.*"version": "\(.*\)".*/\1/p' "$manifest_file" | head -1)"
+package_name="$(sed -n 's/.*"name": "\(.*\)".*/\1/p' "$manifest_file" | head -1)"
 
 if [ -z "$version" ]; then
   version="unbekannt"
 fi
 
+if [ -z "$package_name" ]; then
+  package_name="ttdash"
+fi
+
 info()  { step=$((step + 1)); printf "\n${BLUE}${BOLD}[$step/$total]${NC} %s\n" "$1"; }
 ok()    { printf "  ${GREEN}✓${NC} %s\n" "$1"; }
 fail()  { printf "  ${RED}✗${NC} %s\n" "$1"; exit 1; }
 warn()  { printf "  ${RED}!${NC} %s\n" "$1"; }
 note()  { printf "  ${DIM}› %s${NC}\n" "$1"; }
 
-cd "$(dirname "$0")"
+prepare_bun_global_install() {
+  local bun_global_bin_dir bun_root bun_global_dir bun_global_package_json bun_global_lock cleanup_status
+
+  bun_global_bin_dir="$(bun pm bin -g 2>/dev/null || true)"
+  if [ -z "$bun_global_bin_dir" ]; then
+    return 0
+  fi
+
+  bun_root="$(dirname "$bun_global_bin_dir")"
+  bun_global_dir="$bun_root/install/global"
+  bun_global_package_json="$bun_global_dir/package.json"
+  bun_global_lock="$bun_global_dir/bun.lock"
+
+  if [ ! -f "$bun_global_package_json" ]; then
+    return 0
+  fi
+
+  cleanup_status="$(
+    BUN_GLOBAL_PACKAGE_JSON="$bun_global_package_json" \
+    BUN_PACKAGE_NAME="$package_name" \
+    bun --eval 'const fs = require("fs");
+const file = process.env.BUN_GLOBAL_PACKAGE_JSON;
+const name = process.env.BUN_PACKAGE_NAME;
+const raw = fs.readFileSync(file, "utf8");
+const parsed = JSON.parse(raw);
+const deps = { ...(parsed.dependencies || {}) };
+const hadEntry = Object.prototype.hasOwnProperty.call(deps, name);
+
+if (hadEntry) {
+  delete deps[name];
+}
+
+const next = { ...parsed };
+if (Object.keys(deps).length > 0) {
+  next.dependencies = deps;
+} else {
+  delete next.dependencies;
+}
+
+const normalized = JSON.stringify(next, null, 2) + "\n";
+const normalizedChanged = raw !== normalized;
+
+if (normalizedChanged || hadEntry) {
+  fs.writeFileSync(file, normalized);
+}
+
+if (hadEntry) {
+  console.log("removed");
+} else if (normalizedChanged) {
+  console.log("normalized");
+} else {
+  console.log("clean");
+}'
+  )" || {
+    warn "Vorhandener Bun-Globaleintrag konnte nicht bereinigt werden"
+    return 0
+  }
+
+  if [ "$cleanup_status" = "clean" ]; then
+    return 0
+  fi
+
+  note "Bereinige vorhandenen Bun-Globaleintrag für $package_name"
+  if [ -f "$bun_global_lock" ]; then
+    rm -f "$bun_global_lock"
+  fi
+}
+
+cd "$script_dir"
 
 printf "${BOLD}ttdash v%s${NC} installer\n" "$version"
 printf "${DIM}%s${NC}\n" "$(pwd)"
@@ -79,6 +155,7 @@ fi
 # 3 — Global install
 info "Installiere global..."
 if [ "$global_tool" = "bun" ]; then
+  prepare_bun_global_install
   note "Versuche globale Installation mit bun add -g file:$(pwd)"
   if bun add -g "file:$(pwd)" 2>&1 | tail -1; then
     ok "Global via Bun installiert"
diff --git a/package-lock.json b/package-lock.json
index 187dc93..96623b3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "ttdash",
-  "version": "6.0.10",
+  "version": "6.0.11",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "ttdash",
-      "version": "6.0.10",
+      "version": "6.0.11",
       "license": "MIT",
       "dependencies": {
         "i18next": "^26.0.3",
diff --git a/package.json b/package.json
index 859654e..cc71885 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ttdash",
-  "version": "6.0.10",
+  "version": "6.0.11",
   "description": "Local dashboard for toktrack usage data",
   "main": "server.js",
   "repository": {
diff --git a/src/lib/constants.ts b/src/lib/constants.ts
index 62cdd0c..9526ae3 100644
--- a/src/lib/constants.ts
+++ b/src/lib/constants.ts
@@ -1,4 +1,4 @@
-export const VERSION = '6.0.10'
+export const VERSION = '6.0.11'
 
 export const MODEL_COLORS: Record<string, string> = {
   'Opus 4.6': 'hsl(262, 60%, 55%)',