diff --git a/.gitignore b/.gitignore
index dbf7979..393241c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # Dependencies
 node_modules/
+sync-backend/node_modules/
 
 # Build output
 dist/
@@ -19,6 +20,10 @@ Thumbs.db
 .env
 .env.local
 .env.*.local
+sync-backend/.env
+
+# Local sync backend data
+sync-backend/data/
 
 # Logs
 *.log
diff --git a/README.md b/README.md
index a46b79f..173aa46 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@
 
 ## What is PrepTrack?
 
-PrepTrack is a **free, ad-free, offline-first Progressive Web App** for managing your emergency supplies, pantry, and stockpile. Scan barcodes, track expiry dates, receive local notifications — all data stays on your device. No cloud. No accounts. No tracking.
+PrepTrack is a **free, ad-free, offline-first Progressive Web App** for managing your emergency supplies, pantry, and stockpile. Scan barcodes, track expiry dates, receive local notifications — all data stays on your device by default. No accounts. No tracking.
 
 > **Built for preppers, self-sufficiency enthusiasts, and anyone who wants to keep their supplies organized.**
 
@@ -82,6 +82,7 @@ PrepTrack supports **6 languages** with full translations for every screen, noti
 | **Consumption Log** | Mark products as consumed, expired, or damaged. View statistics. |
 | **Data Export** | JSON backup (complete) and CSV export (Excel/Google Sheets compatible with proper encoding). |
 | **Data Import** | Restore from backup with automatic duplicate detection. |
+| **Optional LAN Sync** | Pair devices with a shared sync code and sync via your own Docker-hosted backend. |
 | **Offline-First** | Fully functional offline. All data in IndexedDB. Service Worker caches assets, fonts, and API responses. |
 | **Installable PWA** | Install as native app on Android, iOS, and Desktop. |
 | **Dark & Light Mode** | Dark theme by default. Toggle to light theme anytime. Accessible color contrast in both modes. |
@@ -172,6 +173,7 @@ PrepTrack supports **6 languages** with full translations for every screen, noti
 | **Icons** | Lucide React | Consistent, lightweight SVG icons |
 | **Animation** | Framer Motion | Smooth UI transitions |
 | **API** | Open Food Facts | Free product database with images |
+| **Optional Backend** | Fastify + SQLite (Docker) | LAN device synchronization |
 | **CI/CD** | GitHub Actions | Auto-deploy to GitHub Pages |
 | **Testing** | Vitest | Unit tests (59 tests) |
 
@@ -205,10 +207,20 @@ The app is available at `http://localhost:5173`.
 ```bash
 npm run build      # Production build (tsc + vite)
 npm run preview    # Preview production build locally
-npm run test       # Run all tests (Vitest)
+npm run test       # Frontend + sync backend tests (Vitest)
 npx tsc --noEmit   # Type check without building
+npm --prefix sync-backend run test # Sync backend integration tests only
 ```
 
+### Optional LAN Sync Backend
+
+```bash
+docker compose -f docker-compose.sync.yml up -d --build
+curl http://localhost:8787/health
+```
+
+Open Settings in the app, enter your backend URL (for example `http://192.168.0.20:8787`), set a shared sync code, and pair each device.
+
 ### Deploy (GitHub Pages)
 
 1. Push to your GitHub repository
@@ -252,7 +264,7 @@ npx tsc --noEmit   # Type check without building
 
 PrepTrack takes your privacy seriously:
 
-- **All data stored locally** on your device (IndexedDB). No cloud. No servers. No accounts.
+- **Default mode is local-only** on your device (IndexedDB). Optional self-hosted LAN sync can be enabled in Settings.
 - **No tracking.** No analytics. No cookies. No ads. No data shared with third parties.
 - **External service:** Only the Open Food Facts API is contacted during barcode scans (open-source, non-profit). Only the barcode is transmitted.
 - **Notifications** are generated locally. No push tokens sent to external servers.
@@ -383,7 +395,7 @@ See [LICENSE](LICENSE) for the full license text.
 
 ## Was ist PrepTrack?
 
-PrepTrack ist eine **kostenlose, werbefreie, Offline-first Progressive Web App** zur Verwaltung von Vorräten. Produkte scannen, Mindesthaltbarkeitsdaten tracken, Benachrichtigungen erhalten — alle Daten bleiben auf deinem Gerät. Keine Cloud. Keine Accounts. Kein Tracking.
+PrepTrack ist eine **kostenlose, werbefreie, Offline-first Progressive Web App** zur Verwaltung von Vorräten. Produkte scannen, Mindesthaltbarkeitsdaten tracken, Benachrichtigungen erhalten — standardmäßig bleiben alle Daten auf deinem Gerät. Keine Accounts. Kein Tracking.
 
 > **Entwickelt für Prepper, Selbstversorger und alle, die ihren Vorrat im Griff haben wollen.**
 
@@ -565,7 +577,7 @@ npx tsc --noEmit   # Type-Check ohne Build
 
 ## 🔒 Datenschutz
 
-- **Alle Daten lokal** auf deinem Gerät (IndexedDB). Keine Cloud. Keine Server. Keine Accounts.
+- **Standardmodus ist lokal** auf deinem Gerät (IndexedDB). Optional kann ein selbst gehosteter LAN-Sync in den Einstellungen aktiviert werden.
 - **Kein Tracking.** Keine Analytics. Keine Cookies. Keine Werbung.
 - **Externer Dienst:** Nur die Open Food Facts API wird beim Barcode-Scan kontaktiert (Open Source, gemeinnützig). Es wird nur der Barcode übermittelt.
 - **Benachrichtigungen** werden lokal erzeugt. Keine Push-Tokens an externe Server.
diff --git a/docker-compose.sync.yml b/docker-compose.sync.yml
new file mode 100644
index 0000000..1bc3377
--- /dev/null
+++ b/docker-compose.sync.yml
@@ -0,0 +1,16 @@
+services:
+  preptrack-sync:
+    build:
+      context: ./sync-backend
+    container_name: preptrack-sync
+    restart: unless-stopped
+    ports:
+      - "8787:8787"
+    environment:
+      PORT: "8787"
+      DB_PATH: "/data/sync.db"
+    volumes:
+      - preptrack_sync_data:/data
+
+volumes:
+  preptrack_sync_data:
diff --git a/package-lock.json b/package-lock.json
index 077a807..d27aeb9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,6 +7,7 @@
     "": {
       "name": "preptrack",
       "version": "1.88_Build_9426",
+      "license": "Apache-2.0",
       "dependencies": {
         "@zxing/browser": "^0.1.5",
         "@zxing/library": "^0.21.3",
@@ -22,12 +23,16 @@
         "zustand": "^5.0.3"
       },
       "devDependencies": {
+        "@fastify/cors": "^11.2.0",
         "@testing-library/jest-dom": "^6.6.3",
         "@testing-library/react": "^16.1.0",
         "@types/react": "^18.3.18",
         "@types/react-dom": "^18.3.5",
         "@vitejs/plugin-react": "^4.3.4",
         "autoprefixer": "^10.4.20",
+        "better-sqlite3": "^12.6.2",
+        "fake-indexeddb": "^6.2.5",
+        "fastify": "^5.8.2",
         "jsdom": "^25.0.1",
         "postcss": "^8.4.49",
         "sharp": "^0.34.5",
@@ -2221,6 +2226,144 @@
         "node": ">=18"
       }
     },
+    "node_modules/@fastify/ajv-compiler": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/@fastify/ajv-compiler/-/ajv-compiler-4.0.5.tgz",
+      "integrity": "sha512-KoWKW+MhvfTRWL4qrhUwAAZoaChluo0m0vbiJlGMt2GXvL4LVPQEjt8kSpHI3IBq5Rez8fg+XeH3cneztq+C7A==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^8.12.0",
+        "ajv-formats": "^3.0.1",
+        "fast-uri": "^3.0.0"
+      }
+    },
+    "node_modules/@fastify/cors": {
+      "version": "11.2.0",
+      "resolved": "https://registry.npmjs.org/@fastify/cors/-/cors-11.2.0.tgz",
+      "integrity": "sha512-LbLHBuSAdGdSFZYTLVA3+Ch2t+sA6nq3Ejc6XLAKiQ6ViS2qFnvicpj0htsx03FyYeLs04HfRNBsz/a8SvbcUw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "fastify-plugin": "^5.0.0",
+        "toad-cache": "^3.7.0"
+      }
+    },
+    "node_modules/@fastify/error": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/@fastify/error/-/error-4.2.0.tgz",
+      "integrity": "sha512-RSo3sVDXfHskiBZKBPRgnQTtIqpi/7zhJOEmAxCiBcM7d0uwdGdxLlsCaLzGs8v8NnxIRlfG0N51p5yFaOentQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/@fastify/fast-json-stringify-compiler": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/@fastify/fast-json-stringify-compiler/-/fast-json-stringify-compiler-5.0.3.tgz",
+      "integrity": "sha512-uik7yYHkLr6fxd8hJSZ8c+xF4WafPK+XzneQDPU+D10r5X19GW8lJcom2YijX2+qtFF1ENJlHXKFM9ouXNJYgQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "fast-json-stringify": "^6.0.0"
+      }
+    },
+    "node_modules/@fastify/forwarded": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@fastify/forwarded/-/forwarded-3.0.1.tgz",
+      "integrity": "sha512-JqDochHFqXs3C3Ml3gOY58zM7OqO9ENqPo0UqAjAjH8L01fRZqwX9iLeX34//kiJubF7r2ZQHtBRU36vONbLlw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/@fastify/merge-json-schemas": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@fastify/merge-json-schemas/-/merge-json-schemas-0.2.1.tgz",
+      "integrity": "sha512-OA3KGBCy6KtIvLf8DINC5880o5iBlDX4SxzLQS8HorJAbqluzLRn80UXU0bxZn7UOFhFgpRJDasfwn9nG4FG4A==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "dequal": "^2.0.3"
+      }
+    },
+    "node_modules/@fastify/proxy-addr": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@fastify/proxy-addr/-/proxy-addr-5.1.0.tgz",
+      "integrity": "sha512-INS+6gh91cLUjB+PVHfu1UqcB76Sqtpyp7bnL+FYojhjygvOPA9ctiD/JDKsyD9Xgu4hUhCSJBPig/w7duNajw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@fastify/forwarded": "^3.0.0",
+        "ipaddr.js": "^2.1.0"
+      }
+    },
     "node_modules/@img/colour": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
@@ -2820,6 +2963,13 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@pinojs/redact": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@pinojs/redact/-/redact-0.4.0.tgz",
+      "integrity": "sha512-k2ENnmBugE/rzQfEcdWHcCY+/FM3VLzH9cYEsbdsoqrvzAKRhUZeRNhAZvB8OitQJ1TBed3yqWtdjzS6wJKBwg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -3601,6 +3751,13 @@
       "license": "(Unlicense OR Apache-2.0)",
       "optional": true
     },
+    "node_modules/abstract-logging": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/abstract-logging/-/abstract-logging-2.0.1.tgz",
+      "integrity": "sha512-2BjRTZxTPvheOvGbBslFSYOUkr+SjPtOnrLP33f+VIWLzezQpZcqVg7ja3L4dBXmzzgwT+a029jRx5PCi3JuiA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/acorn": {
       "version": "8.16.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.16.0.tgz",
@@ -3641,6 +3798,24 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "node_modules/ajv-formats": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/ajv-formats/-/ajv-formats-3.0.1.tgz",
+      "integrity": "sha512-8iUql50EUR+uUcdRQ3HDqa6EVyo3docL8g5WJ3FNcWmu62IbkGUue/pEyLBW8VGKKucTPgqeks4fIU1DA4yowQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^8.0.0"
+      },
+      "peerDependencies": {
+        "ajv": "^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "ajv": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/ansi-regex": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
@@ -3787,6 +3962,16 @@
         "node": ">= 4.0.0"
       }
     },
+    "node_modules/atomic-sleep": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/atomic-sleep/-/atomic-sleep-1.0.0.tgz",
+      "integrity": "sha512-kNOjDqAh7px0XWNI+4QbzoiR/nTkHAWNud2uvnJquD1/x5a7EQZMJT0AczqK0Qn67oY/TTQ1LbUKajZpp3I9tQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
     "node_modules/autoprefixer": {
       "version": "10.4.27",
       "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.4.27.tgz",
@@ -3840,6 +4025,27 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/avvio": {
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/avvio/-/avvio-9.2.0.tgz",
+      "integrity": "sha512-2t/sy01ArdHHE0vRH5Hsay+RtCZt3dLPji7W7/MMOCEgze5b7SNDC4j5H6FnVgPkI1MTNFGzHdHrVXDDl7QSSQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@fastify/error": "^4.0.0",
+        "fastq": "^1.17.1"
+      }
+    },
     "node_modules/babel-plugin-polyfill-corejs2": {
       "version": "0.4.16",
       "resolved": "https://registry.npmjs.org/babel-plugin-polyfill-corejs2/-/babel-plugin-polyfill-corejs2-0.4.16.tgz",
@@ -3892,6 +4098,27 @@
         "node": "18 || 20 || >=22"
       }
     },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/baseline-browser-mapping": {
       "version": "2.10.0",
       "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.10.0.tgz",
@@ -3905,6 +4132,21 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/better-sqlite3": {
+      "version": "12.6.2",
+      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.6.2.tgz",
+      "integrity": "sha512-8VYKM3MjCa9WcaSAI3hzwhmyHVlH8tiGFwf0RlTsZPWJ1I5MkzjiudCo4KC4DxOaL/53A5B1sI/IbldNFDbsKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "bindings": "^1.5.0",
+        "prebuild-install": "^7.1.1"
+      },
+      "engines": {
+        "node": "20.x || 22.x || 23.x || 24.x || 25.x"
+      }
+    },
     "node_modules/binary-extensions": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.3.0.tgz",
@@ -3918,6 +4160,28 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/bindings": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+      "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "file-uri-to-path": "1.0.0"
+      }
+    },
+    "node_modules/bl": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
     "node_modules/brace-expansion": {
       "version": "5.0.4",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.4.tgz",
@@ -3978,6 +4242,31 @@
         "node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
       }
     },
+    "node_modules/buffer": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
     "node_modules/buffer-from": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.2.tgz",
@@ -4141,6 +4430,13 @@
         "node": ">= 6"
       }
     },
+    "node_modules/chownr": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -4181,6 +4477,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/cookie": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-1.1.1.tgz",
+      "integrity": "sha512-ei8Aos7ja0weRpFzJnEA9UHJ/7XQmqglbRwnf2ATjcB9Wq874VKH9kfjjirM6UhU2/E5fFYadylyhFldcqSidQ==",
+      "dev": true,
+      "license": "MIT",
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+    "node_modules/tar-fs": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.4.tgz",
+      "integrity": "sha512-mDAjwmZdh7LTT6pNleZ05Yt65HC3E+NiQzl672vQG38jIrehtJk/J3mNwIg+vShQPcLF/LV7CMnDW6vjj6sfYQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "chownr": "^1.1.1",
+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.1.4"
+      }
+    },
+    "node_modules/tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/temp-dir": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/temp-dir/-/temp-dir-2.0.0.tgz",
@@ -7851,6 +8878,19 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/thread-stream": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-4.0.0.tgz",
+      "integrity": "sha512-4iMVL6HAINXWf1ZKZjIPcz5wYaOdPhtO8ATvZ+Xqp3BTdaqtAwQkNmKORqcIo5YkQqGXq5cwfswDwMqqQNrpJA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "real-require": "^0.2.0"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -7976,6 +9016,16 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/toad-cache": {
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/toad-cache/-/toad-cache-3.7.0.tgz",
+      "integrity": "sha512-/m8M+2BJUpoJdgAHoG+baCwBT+tf2VraSfkBgl0Y00qIWt41DJ8R5B8nsEw0I58YwF5IZH6z24/2TobDKnqSWw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/tough-cookie": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.1.2.tgz",
@@ -8024,6 +9074,19 @@
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
       "license": "0BSD"
     },
+    "node_modules/tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/type-fest": {
       "version": "0.16.0",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.16.0.tgz",
@@ -10024,6 +11087,13 @@
         "workbox-core": "7.4.0"
       }
     },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/ws": {
       "version": "8.19.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-8.19.0.tgz",
diff --git a/package.json b/package.json
index 8eaadbc..36fbb43 100644
--- a/package.json
+++ b/package.json
@@ -28,12 +28,16 @@
     "zustand": "^5.0.3"
   },
   "devDependencies": {
+    "@fastify/cors": "^11.2.0",
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.1.0",
     "@types/react": "^18.3.18",
     "@types/react-dom": "^18.3.5",
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
+    "better-sqlite3": "^12.6.2",
+    "fake-indexeddb": "^6.2.5",
+    "fastify": "^5.8.2",
     "jsdom": "^25.0.1",
     "postcss": "^8.4.49",
     "sharp": "^0.34.5",
diff --git a/src/App.tsx b/src/App.tsx
index afaa2ad..135df27 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -2,6 +2,7 @@ import { useEffect, lazy, Suspense } from 'react';
 import { useAppStore } from './store/useAppStore';
 import { seedDefaults } from './lib/db';
 import { startNotificationChecker } from './lib/notifications';
+import { startSyncEngine } from './lib/sync';
 import { ErrorBoundary } from './components/ErrorBoundary';
 import { OfflineBanner } from './components/OfflineBanner';
 import { PWAInstallPrompt } from './components/PWAInstallPrompt';
@@ -69,7 +70,11 @@ export default function App() {
     );
 
     const interval = startNotificationChecker();
-    return () => clearInterval(interval);
+    const stopSync = startSyncEngine();
+    return () => {
+      clearInterval(interval);
+      stopSync();
+    };
   }, []);
 
   return (
diff --git a/src/components/ProductList.tsx b/src/components/ProductList.tsx
index 60f3c76..e01b270 100644
--- a/src/components/ProductList.tsx
+++ b/src/components/ProductList.tsx
@@ -33,7 +33,7 @@ import {
   Plus,
 } from 'lucide-react';
 import { useState, useEffect, useCallback, useMemo } from 'react';
-import { archiveProduct, deleteProduct, logConsumption } from '../lib/db';
+import { archiveProduct, deleteProduct, logConsumption, updateProduct } from '../lib/db';
 
 const STATUS_COLORS: Record<string, string> = {
   expired: 'bg-red-500',
@@ -108,7 +108,7 @@ export function ProductList() {
       await archiveProduct(productId);
       showToast(t('consume.toastConsumedAndArchived', { name: product.name, amount, unit: product.unit }));
     } else {
-      await db.products.update(productId, { quantity: newQuantity, updatedAt: new Date().toISOString() });
+      await updateProduct(productId, { quantity: newQuantity });
       showToast(t('consume.toastConsumed', { name: product.name, amount, unit: product.unit, remaining: newQuantity }));
     }
     setConsumeProduct(null);
diff --git a/src/components/Settings.tsx b/src/components/Settings.tsx
index 26110b0..f98437c 100644
--- a/src/components/Settings.tsx
+++ b/src/components/Settings.tsx
@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useEffect, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { version as appVersion } from '../../package.json';
 import { useLiveQuery } from 'dexie-react-hooks';
@@ -8,6 +8,13 @@ import { useDarkMode } from '../hooks/useDarkMode';
 import { usePWAInstall } from '../hooks/usePWAInstall';
 import { useAppStore } from '../store/useAppStore';
 import { downloadFile } from '../lib/utils';
+import { getSyncConfig, saveSyncConfig, clearSyncPairing } from '../lib/syncConfig';
+import {
+  getSyncRuntimeState,
+  pairSyncDevice,
+  runSyncNow,
+  subscribeSyncRuntime,
+} from '../lib/sync';
 import {
   Bell,
   BellOff,
@@ -28,6 +35,8 @@ import {
   ChevronUp,
   Info,
   Globe,
+  Cloud,
+  RefreshCw,
 } from 'lucide-react';
 
 const LANGUAGES = [
@@ -39,6 +48,13 @@ const LANGUAGES = [
   { code: 'fr', label: 'Français', flag: '🇫🇷' },
 ];
 
+function formatSyncTime(value?: string): string {
+  if (!value) return '—';
+  const date = new Date(value);
+  if (Number.isNaN(date.getTime())) return '—';
+  return date.toLocaleString();
+}
+
 export function Settings() {
   const [isDark, toggleDark] = useDarkMode();
   const { notificationsEnabled, setNotificationsEnabled } = useAppStore();
@@ -47,6 +63,14 @@ export function Settings() {
   const allProducts = useLiveQuery(() => db.products.toArray()) ?? [];
   const [newLocation, setNewLocation] = useState('');
   const [importStatus, setImportStatus] = useState<{ message: string; type: 'success' | 'warning' | 'error' } | null>(null);
+  const [syncConfigState, setSyncConfigState] = useState(() => getSyncConfig());
+  const [syncServerUrl, setSyncServerUrl] = useState(syncConfigState.serverUrl);
+  const [syncDeviceName, setSyncDeviceName] = useState(syncConfigState.deviceName || '');
+  const [syncCode, setSyncCode] = useState('');
+  const [showRepair, setShowRepair] = useState(false);
+  const [syncBusy, setSyncBusy] = useState(false);
+  const [syncNotice, setSyncNotice] = useState<{ type: 'success' | 'error'; message: string } | null>(null);
+  const [syncRuntime, setSyncRuntime] = useState(() => getSyncRuntimeState());
   const [showImpressum, setShowImpressum] = useState(false);
   const [showDatenschutz, setShowDatenschutz] = useState(false);
   const [showAGB, setShowAGB] = useState(false);
@@ -110,7 +134,88 @@ export function Settings() {
     i18n.changeLanguage(langCode);
   }
 
+  useEffect(() => {
+    return subscribeSyncRuntime((next) => {
+      setSyncRuntime(next);
+    });
+  }, []);
+
+  function handleSaveSyncSettings() {
+    const next = saveSyncConfig({
+      ...syncConfigState,
+      serverUrl: syncServerUrl.trim(),
+      deviceName: syncDeviceName.trim(),
+    });
+    setSyncConfigState(next);
+    setSyncNotice({ type: 'success', message: 'Sync-Einstellungen gespeichert.' });
+  }
+
+  async function handlePairSyncDevice() {
+    if (!syncServerUrl.trim() || !syncCode.trim() || !syncDeviceName.trim()) {
+      setSyncNotice({
+        type: 'error',
+        message: 'Server URL, Sync-Code und Gerätename sind erforderlich.',
+      });
+      return;
+    }
+
+    setSyncBusy(true);
+    setSyncNotice(null);
+    try {
+      await pairSyncDevice({
+        serverUrl: syncServerUrl.trim(),
+        syncCode: syncCode.trim(),
+        deviceName: syncDeviceName.trim(),
+      });
+      setSyncCode('');
+      setShowRepair(false);
+      const next = getSyncConfig();
+      setSyncConfigState(next);
+      setSyncNotice({ type: 'success', message: 'Gerät erfolgreich gekoppelt.' });
+      await runSyncNow('pairing');
+    } catch (err) {
+      setSyncNotice({
+        type: 'error',
+        message: err instanceof Error ? err.message : 'Koppeln fehlgeschlagen.',
+      });
+    } finally {
+      setSyncBusy(false);
+    }
+  }
+
+  function handleToggleSyncEnabled(enabled: boolean) {
+    const next = saveSyncConfig({
+      ...syncConfigState,
+      enabled,
+      serverUrl: syncServerUrl.trim(),
+      deviceName: syncDeviceName.trim(),
+    });
+    setSyncConfigState(next);
+    setSyncNotice(null);
+    void runSyncNow(enabled ? 'enable' : 'disable').catch(() => undefined);
+  }
+
+  async function handleSyncNowClick() {
+    setSyncBusy(true);
+    setSyncNotice(null);
+    try {
+      await runSyncNow('manual');
+      setSyncNotice({ type: 'success', message: 'Sync abgeschlossen.' });
+    } catch (err) {
+      setSyncNotice({
+        type: 'error',
+        message: err instanceof Error ? err.message : 'Sync fehlgeschlagen.',
+      });
+    } finally {
+      setSyncBusy(false);
+    }
+  }
+
   const notifStatus = getNotificationPermissionStatus();
+  const syncIsPaired =
+    syncConfigState.householdId.length > 0 &&
+    syncConfigState.deviceId.length > 0 &&
+    syncConfigState.deviceToken.length > 0;
 
   return (
     <div className="space-y-6">
@@ -377,6 +482,152 @@ export function Settings() {
         </div>
       </section>
 
+      {/* Sync */}
+      <section className="rounded-xl border border-sky-500/30 bg-sky-500/5 p-4">
+        <h3 className="mb-3 flex items-center gap-2 font-semibold text-gray-200">
+          <Cloud size={18} className="text-sky-400" />
+          LAN Sync (optional)
+        </h3>
+
+        <p className="mb-3 text-xs text-gray-400">
+          Daten bleiben lokal nutzbar. Sync ist optional und wird nur mit deinem eigenen Backend verwendet.
+        </p>
+
+        <div className="space-y-2">
+          <div>
+            <label className="mb-1 block text-xs font-medium text-gray-400">Server URL</label>
+            <input
+              type="url"
+              value={syncServerUrl}
+              onChange={(e) => setSyncServerUrl(e.target.value)}
+              placeholder="http://192.168.0.20:8787"
+              className="w-full rounded-lg border border-primary-600 bg-primary-900 px-3 py-2 text-sm text-gray-200 placeholder-gray-500 focus:border-sky-500 focus:outline-none"
+            />
+          </div>
+
+          <div>
+            <label className="mb-1 block text-xs font-medium text-gray-400">Gerätename</label>
+            <input
+              type="text"
+              value={syncDeviceName}
+              onChange={(e) => setSyncDeviceName(e.target.value)}
+              placeholder="z. B. iPhone Küche"
+              className="w-full rounded-lg border border-primary-600 bg-primary-900 px-3 py-2 text-sm text-gray-200 placeholder-gray-500 focus:border-sky-500 focus:outline-none"
+            />
+          </div>
+
+          {(!syncIsPaired || showRepair) && (
+            <div>
+              <label className="mb-1 block text-xs font-medium text-gray-400">Sync-Code</label>
+              <input
+                type="password"
+                value={syncCode}
+                onChange={(e) => setSyncCode(e.target.value)}
+                placeholder="gemeinsamer Haushalt-Code"
+                className="w-full rounded-lg border border-primary-600 bg-primary-900 px-3 py-2 text-sm text-gray-200 placeholder-gray-500 focus:border-sky-500 focus:outline-none"
+              />
+            </div>
+          )}
+
+          <div className="grid grid-cols-1 gap-2 sm:grid-cols-2">
+            <button
+              onClick={handleSaveSyncSettings}
+              className="rounded-lg bg-primary-700 px-3 py-2 text-sm text-gray-200 hover:bg-primary-600"
+            >
+              Einstellungen speichern
+            </button>
+
+            {!syncIsPaired || showRepair ? (
+              <button
+                onClick={handlePairSyncDevice}
+                disabled={syncBusy}
+                className="rounded-lg bg-sky-600 px-3 py-2 text-sm font-medium text-white hover:bg-sky-500 disabled:cursor-not-allowed disabled:opacity-60"
+              >
+                {showRepair ? 'Neu koppeln' : 'Gerät koppeln'}
+              </button>
+            ) : (
+              <button
+                onClick={handleSyncNowClick}
+                disabled={syncBusy || !syncConfigState.enabled}
+                className="flex items-center justify-center gap-2 rounded-lg bg-sky-600 px-3 py-2 text-sm font-medium text-white hover:bg-sky-500 disabled:cursor-not-allowed disabled:opacity-60"
+              >
+                <RefreshCw size={15} className={syncBusy ? 'animate-spin' : ''} />
+                Jetzt synchronisieren
+              </button>
+            )}
+          </div>
+
+          {syncIsPaired && !showRepair && (
+            <button
+              onClick={() => {
+                clearSyncPairing();
+                setSyncConfigState(getSyncConfig());
+                setSyncCode('');
+                setShowRepair(true);
+                setSyncNotice(null);
+              }}
+              className="w-full text-xs text-gray-500 hover:text-gray-300"
+            >
+              Neu koppeln (anderen Server oder Code verwenden)
+            </button>
+          )}
+          {showRepair && (
+            <button
+              onClick={() => { setSyncCode(''); setShowRepair(false); }}
+              className="w-full text-xs text-gray-500 hover:text-gray-300"
+            >
+              Abbrechen
+            </button>
+          )}
+
+          {syncIsPaired && (
+            <button
+              onClick={() => handleToggleSyncEnabled(!syncConfigState.enabled)}
+              className="flex w-full items-center justify-between rounded-lg bg-primary-700/50 px-4 py-3"
+            >
+              <span className="text-sm text-gray-200">Hintergrund-Sync</span>
+              <div
+                className={`relative h-6 w-11 rounded-full transition-colors ${
+                  syncConfigState.enabled ? 'bg-sky-600' : 'bg-gray-500'
+                }`}
+              >
+                <div
+                  className={`absolute top-0.5 h-5 w-5 rounded-full bg-white shadow transition-transform ${
+                    syncConfigState.enabled ? 'translate-x-5' : 'translate-x-0.5'
+                  }`}
+                />
+              </div>
+            </button>
+          )}
+
+          <div className="rounded-lg border border-primary-700 bg-primary-800/60 px-3 py-2 text-xs text-gray-400">
+            <p>Status: <span className="text-gray-300">{syncRuntime.status}</span></p>
+            <p>Ausstehende Änderungen: <span className="text-gray-300">{syncRuntime.pendingChanges}</span></p>
+            <p>Letzter Erfolg: <span className="text-gray-300">{formatSyncTime(syncRuntime.lastSuccessAt)}</span></p>
+            {syncRuntime.lastError && (
+              <p className="text-red-400">Fehler: {syncRuntime.lastError}</p>
+            )}
+            {syncIsPaired && (
+              <p className="mt-1 break-all text-[11px] text-gray-500">
+                Haushalt: {syncConfigState.householdId}
+              </p>
+            )}
+          </div>
+
+          {syncNotice && (
+            <p
+              className={`rounded-lg px-3 py-2 text-sm ${
+                syncNotice.type === 'error'
+                  ? 'bg-red-500/10 text-red-400'
+                  : 'bg-green-500/10 text-green-400'
+              }`}
+            >
+              {syncNotice.message}
+            </p>
+          )}
+        </div>
+      </section>
+
       {/* Spenden */}
       <section className="rounded-xl border border-pink-500/20 bg-pink-500/5 p-4">
         <h3 className="mb-3 flex items-center gap-2 font-semibold text-gray-200">
diff --git a/src/lib/db.import.test.ts b/src/lib/db.import.test.ts
new file mode 100644
index 0000000..e362e97
--- /dev/null
+++ b/src/lib/db.import.test.ts
@@ -0,0 +1,116 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { indexedDB, IDBKeyRange } from 'fake-indexeddb';
+
+class MemoryStorage implements Storage {
+  private store = new Map<string, string>();
+
+  get length(): number {
+    return this.store.size;
+  }
+
+  clear(): void {
+    this.store.clear();
+  }
+
+  getItem(key: string): string | null {
+    return this.store.get(key) ?? null;
+  }
+
+  key(index: number): string | null {
+    return Array.from(this.store.keys())[index] ?? null;
+  }
+
+  removeItem(key: string): void {
+    this.store.delete(key);
+  }
+
+  setItem(key: string, value: string): void {
+    this.store.set(key, value);
+  }
+}
+
+describe('importData sync linkage', () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    Object.defineProperty(globalThis, 'indexedDB', {
+      value: indexedDB,
+      configurable: true,
+    });
+    Object.defineProperty(globalThis, 'IDBKeyRange', {
+      value: IDBKeyRange,
+      configurable: true,
+    });
+    Object.defineProperty(globalThis, 'localStorage', {
+      value: new MemoryStorage(),
+      configurable: true,
+    });
+    Object.defineProperty(globalThis, 'sessionStorage', {
+      value: new MemoryStorage(),
+      configurable: true,
+    });
+  });
+
+  it('derives productSyncId for imported legacy logs before queueing sync changes', async () => {
+    const { saveSyncConfig } = await import('./syncConfig');
+    saveSyncConfig({
+      enabled: true,
+      serverUrl: 'http://localhost:8787',
+      householdId: 'house-1',
+      deviceId: 'device-1',
+      deviceToken: 'token-1',
+      deviceName: 'Desktop',
+    });
+
+    const { db, importData } = await import('./db');
+    await db.delete();
+    await db.open();
+
+    const payload = {
+      version: 'legacy',
+      exportedAt: '2026-03-12T10:00:00.000Z',
+      products: [
+        {
+          id: 42,
+          name: 'Reis',
+          category: 'lebensmittel',
+          storageLocation: 'Keller',
+          quantity: 3,
+          unit: 'Stück',
+          expiryDate: '2027-01-01T00:00:00.000Z',
+          expiryPrecision: 'day',
+          archived: false,
+          createdAt: '2026-03-10T10:00:00.000Z',
+          updatedAt: '2026-03-10T10:00:00.000Z',
+        },
+      ],
+      storageLocations: [],
+      consumptionLogs: [
+        {
+          id: 9,
+          productId: 42,
+          productName: 'Reis',
+          quantity: 1,
+          unit: 'Stück',
+          consumedAt: '2026-03-11T09:00:00.000Z',
+          reason: 'verbraucht',
+        },
+      ],
+    };
+
+    await importData(JSON.stringify(payload));
+
+    const logs = await db.consumptionLogs.toArray();
+    expect(logs).toHaveLength(1);
+    expect(logs[0].productSyncId).toBeTypeOf('string');
+    expect(logs[0].productSyncId?.length).toBeGreaterThan(0);
+    expect(typeof logs[0].productId).toBe('number');
+
+    const queueRows = await db.syncQueue.toArray();
+    const logSyncRow = queueRows.find(
+      (row) => row.entityType === 'consumptionLog' && row.op === 'upsert'
+    );
+    expect(logSyncRow).toBeDefined();
+    expect(logSyncRow?.payload?.productSyncId).toBe(logs[0].productSyncId);
+    expect(logSyncRow?.payload?.productId).toBe(logs[0].productId);
+  });
+});
diff --git a/src/lib/db.ts b/src/lib/db.ts
index e16475c..4591a70 100644
--- a/src/lib/db.ts
+++ b/src/lib/db.ts
@@ -2,18 +2,96 @@ import Dexie, { type Table } from 'dexie';
 import { version as appVersion } from '../../package.json';
 import i18n from '../i18n/i18n';
 import { getLocale } from './utils';
+import { isSyncEnabled } from './syncConfig';
 import type {
   Product,
   StorageLocation,
   ConsumptionLog,
   NotificationSchedule,
+  SyncEntityType,
+  SyncOperation,
 } from '../types';
 
+export interface SyncQueueRow {
+  id?: number;
+  entityType: SyncEntityType;
+  entitySyncId: string;
+  op: SyncOperation;
+  updatedAt: string;
+  payload?: Record<string, unknown>;
+}
+
+export interface SyncMetaRow {
+  key: string;
+  value: string;
+}
+
+const VALID_REASONS: ConsumptionLog['reason'][] = [
+  'verbraucht',
+  'abgelaufen',
+  'beschadigt',
+  'sonstiges',
+];
+
+let syncQueueSuppressionDepth = 0;
+
+function createSyncId(): string {
+  if (typeof globalThis.crypto?.randomUUID === 'function') {
+    return globalThis.crypto.randomUUID();
+  }
+  return `${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 10)}`;
+}
+
+function shouldQueueSyncChange(): boolean {
+  return syncQueueSuppressionDepth === 0 && isSyncEnabled();
+}
+
+function toSyncProductPayload(product: Omit<Product, 'id'>): Record<string, unknown> {
+  return {
+    ...product,
+    // Explicit null for optional fields so JSON serialization preserves intentional clears.
+    // Receivers distinguish null (cleared) from absent key (unknown/fallback).
+    barcode: product.barcode ?? null,
+    photo: product.photo ?? null,
+    minStock: product.minStock ?? null,
+    notes: product.notes ?? null,
+  };
+}
+
+function toSyncLocationPayload(location: Omit<StorageLocation, 'id'>): Record<string, unknown> {
+  return { ...location };
+}
+
+function toSyncLogPayload(log: Omit<ConsumptionLog, 'id'>): Record<string, unknown> {
+  return { ...log };
+}
+
+function toIso(value: unknown, fallback: string): string {
+  if (typeof value !== 'string') return fallback;
+  const dt = new Date(value);
+  if (Number.isNaN(dt.getTime())) return fallback;
+  return dt.toISOString();
+}
+
+function normalizeNumber(value: unknown, fallback: number): number {
+  if (typeof value === 'number' && Number.isFinite(value)) return value;
+  return fallback;
+}
+
+function normalizeReason(value: unknown, fallback: ConsumptionLog['reason']): ConsumptionLog['reason'] {
+  if (typeof value === 'string' && VALID_REASONS.includes(value as ConsumptionLog['reason'])) {
+    return value as ConsumptionLog['reason'];
+  }
+  return fallback;
+}
+
 export class PrepTrackDB extends Dexie {
   products!: Table<Product, number>;
   storageLocations!: Table<StorageLocation, number>;
   consumptionLogs!: Table<ConsumptionLog, number>;
   notificationSchedules!: Table<NotificationSchedule, number>;
+  syncQueue!: Table<SyncQueueRow, number>;
+  syncMeta!: Table<SyncMetaRow, string>;
 
   constructor() {
     super('PrepTrackDB');
@@ -33,56 +111,272 @@ export class PrepTrackDB extends Dexie {
       consumptionLogs: '++id, productId, consumedAt',
       notificationSchedules: '++id, productId, notifyAt, sent, [productId+daysBefore]',
     });
+
+    this.version(3)
+      .stores({
+        products:
+          '++id, &syncId, name, barcode, category, storageLocation, expiryDate, archived, createdAt, updatedAt',
+        storageLocations: '++id, &syncId, name, createdAt, updatedAt',
+        consumptionLogs: '++id, &syncId, productId, productSyncId, consumedAt, updatedAt',
+        notificationSchedules: '++id, productId, notifyAt, sent, [productId+daysBefore]',
+        syncQueue: '++id, [entityType+entitySyncId], updatedAt',
+        syncMeta: '&key',
+      })
+      .upgrade(async (tx) => {
+        const now = new Date().toISOString();
+        const productsTable = tx.table('products') as Table<Product, number>;
+        const storageTable = tx.table('storageLocations') as Table<StorageLocation, number>;
+        const logsTable = tx.table('consumptionLogs') as Table<ConsumptionLog, number>;
+        const syncMetaTable = tx.table('syncMeta') as Table<SyncMetaRow, string>;
+
+        const products = await productsTable.toArray();
+        const productSyncById = new Map<number, string>();
+        for (const product of products) {
+          const next: Product = {
+            ...product,
+            syncId: product.syncId ?? createSyncId(),
+            updatedAt: product.updatedAt ?? product.createdAt ?? now,
+          };
+          if (product.id !== undefined) {
+            productSyncById.set(product.id, next.syncId!);
+            await productsTable.put(next);
+          }
+        }
+
+        const locations = await storageTable.toArray();
+        for (const location of locations) {
+          const next: StorageLocation = {
+            ...location,
+            syncId: location.syncId ?? createSyncId(),
+            updatedAt: location.updatedAt ?? location.createdAt ?? now,
+          };
+          await storageTable.put(next);
+        }
+
+        const logs = await logsTable.toArray();
+        for (const log of logs) {
+          const next: ConsumptionLog = {
+            ...log,
+            syncId: log.syncId ?? createSyncId(),
+            productSyncId:
+              log.productSyncId ??
+              (typeof log.productId === 'number' ? productSyncById.get(log.productId) : undefined),
+            updatedAt: log.updatedAt ?? log.consumedAt ?? now,
+          };
+          await logsTable.put(next);
+        }
+
+        await syncMetaTable.put({ key: 'sync_cursor', value: '0' });
+        await syncMetaTable.put({ key: 'sync_full_snapshot_pending', value: '0' });
+      });
   }
 }
 
 export const db = new PrepTrackDB();
 
+async function enqueueSyncChange(row: Omit<SyncQueueRow, 'id'>): Promise<void> {
+  if (!shouldQueueSyncChange()) return;
+  await db.syncQueue.add(row);
+}
+
+export async function withSyncQueueSuppressed<T>(fn: () => Promise<T>): Promise<T> {
+  syncQueueSuppressionDepth += 1;
+  try {
+    return await fn();
+  } finally {
+    syncQueueSuppressionDepth -= 1;
+  }
+}
+
+export async function getSyncMetaValue(key: string): Promise<string | undefined> {
+  const row = await db.syncMeta.get(key);
+  return row?.value;
+}
+
+export async function setSyncMetaValue(key: string, value: string): Promise<void> {
+  await db.syncMeta.put({ key, value });
+}
+
+export async function getQueuedSyncChanges(limit = 500): Promise<SyncQueueRow[]> {
+  return db.syncQueue.orderBy('id').limit(limit).toArray();
+}
+
+export async function removeQueuedSyncChanges(ids: number[]): Promise<void> {
+  if (ids.length === 0) return;
+  await db.syncQueue.bulkDelete(ids);
+}
+
+export async function getSyncQueueCount(): Promise<number> {
+  return db.syncQueue.count();
+}
+
+export async function queueFullSnapshotForSync(resetQueue = false): Promise<void> {
+  if (!isSyncEnabled()) return;
+  if (resetQueue) {
+    await db.syncQueue.clear();
+  }
+
+  const [products, locations, logs] = await Promise.all([
+    db.products.toArray(),
+    db.storageLocations.toArray(),
+    db.consumptionLogs.toArray(),
+  ]);
+
+  const batch: Omit<SyncQueueRow, 'id'>[] = [];
+
+  for (const product of products) {
+    if (!product.syncId) continue;
+    const { id: _id, ...payload } = product;
+    batch.push({
+      entityType: 'product',
+      entitySyncId: product.syncId,
+      op: 'upsert',
+      updatedAt: product.updatedAt,
+      payload: toSyncProductPayload(payload),
+    });
+  }
+
+  for (const location of locations) {
+    if (!location.syncId) continue;
+    const { id: _id, ...payload } = location;
+    batch.push({
+      entityType: 'storageLocation',
+      entitySyncId: location.syncId,
+      op: 'upsert',
+      updatedAt: location.updatedAt ?? location.createdAt,
+      payload: toSyncLocationPayload(payload),
+    });
+  }
+
+  for (const log of logs) {
+    if (!log.syncId) continue;
+    const { id: _id, ...payload } = log;
+    batch.push({
+      entityType: 'consumptionLog',
+      entitySyncId: log.syncId,
+      op: 'upsert',
+      updatedAt: log.updatedAt ?? log.consumedAt,
+      payload: toSyncLogPayload(payload),
+    });
+  }
+
+  if (batch.length > 0) {
+    await db.syncQueue.bulkAdd(batch);
+  }
+}
+
 // Seed default storage locations on first run
 export async function seedDefaults(): Promise<void> {
   const count = await db.storageLocations.count();
   if (count === 0) {
     const now = new Date().toISOString();
     await db.storageLocations.bulkAdd([
-      { name: 'Keller', createdAt: now },
-      { name: 'Garage', createdAt: now },
-      { name: 'Küche', createdAt: now },
-      { name: 'Dachboden', createdAt: now },
-      { name: 'Vorratsraum', createdAt: now },
-      { name: 'Bunker', createdAt: now },
-      { name: 'Auto', createdAt: now },
-      { name: 'Gartenhaus', createdAt: now },
+      { syncId: createSyncId(), name: 'Keller', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Garage', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Küche', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Dachboden', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Vorratsraum', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Bunker', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Auto', createdAt: now, updatedAt: now },
+      { syncId: createSyncId(), name: 'Gartenhaus', createdAt: now, updatedAt: now },
     ]);
   }
 }
 
 // Product CRUD
 export async function addProduct(product: Omit<Product, 'id'>): Promise<number> {
-  return db.products.add(product);
+  const now = new Date().toISOString();
+  const next: Omit<Product, 'id'> = {
+    ...product,
+    syncId: product.syncId ?? createSyncId(),
+    createdAt: product.createdAt ?? now,
+    updatedAt: product.updatedAt ?? now,
+  };
+
+  const id = await db.products.add(next);
+  await enqueueSyncChange({
+    entityType: 'product',
+    entitySyncId: next.syncId!,
+    op: 'upsert',
+    updatedAt: next.updatedAt,
+    payload: toSyncProductPayload(next),
+  });
+  return id;
 }
 
 export async function updateProduct(
   id: number,
   changes: Partial<Product>
 ): Promise<number> {
-  return db.products.update(id, {
+  const existing = await db.products.get(id);
+  if (!existing) return 0;
+
+  const now = new Date().toISOString();
+  const next: Omit<Product, 'id'> = {
+    ...existing,
     ...changes,
-    updatedAt: new Date().toISOString(),
-  });
+    syncId: existing.syncId ?? createSyncId(),
+    updatedAt: changes.updatedAt ?? now,
+  };
+
+  const updated = await db.products.update(id, next);
+  if (updated) {
+    await enqueueSyncChange({
+      entityType: 'product',
+      entitySyncId: next.syncId!,
+      op: 'upsert',
+      updatedAt: next.updatedAt,
+      payload: toSyncProductPayload(next),
+    });
+  }
+  return updated;
 }
 
 export async function deleteProduct(id: number): Promise<void> {
-  await db.transaction('rw', db.products, db.consumptionLogs, db.notificationSchedules, async () => {
-    await db.products.delete(id);
-    await db.consumptionLogs.where('productId').equals(id).delete();
-    await db.notificationSchedules.where('productId').equals(id).delete();
-  });
+  const product = await db.products.get(id);
+  if (!product) return;
+
+  const relatedLogs = await db.consumptionLogs.where('productId').equals(id).toArray();
+  const now = new Date().toISOString();
+
+  await db.transaction(
+    'rw',
+    db.products,
+    db.consumptionLogs,
+    db.notificationSchedules,
+    async () => {
+      await db.products.delete(id);
+      await db.consumptionLogs.where('productId').equals(id).delete();
+      await db.notificationSchedules.where('productId').equals(id).delete();
+    }
+  );
+
+  if (product.syncId) {
+    await enqueueSyncChange({
+      entityType: 'product',
+      entitySyncId: product.syncId,
+      op: 'delete',
+      updatedAt: now,
+    });
+  }
+
+  const logDeletes = relatedLogs
+    .filter((log) => typeof log.syncId === 'string' && log.syncId.length > 0)
+    .map((log) =>
+      enqueueSyncChange({
+        entityType: 'consumptionLog',
+        entitySyncId: log.syncId!,
+        op: 'delete',
+        updatedAt: now,
+      })
+    );
+
+  await Promise.all(logDeletes);
 }
 
 export async function archiveProduct(id: number): Promise<void> {
-  await db.products.update(id, {
+  await updateProduct(id, {
     archived: true,
-    updatedAt: new Date().toISOString(),
   });
 }
 
@@ -96,21 +390,234 @@ export async function getArchivedProducts(): Promise<Product[]> {
 
 // Storage Location CRUD
 export async function addStorageLocation(name: string): Promise<number> {
-  return db.storageLocations.add({
+  const now = new Date().toISOString();
+  const next: Omit<StorageLocation, 'id'> = {
+    syncId: createSyncId(),
     name,
-    createdAt: new Date().toISOString(),
+    createdAt: now,
+    updatedAt: now,
+  };
+  const id = await db.storageLocations.add(next);
+  await enqueueSyncChange({
+    entityType: 'storageLocation',
+    entitySyncId: next.syncId!,
+    op: 'upsert',
+    updatedAt: next.updatedAt!,
+    payload: toSyncLocationPayload(next),
   });
+  return id;
 }
 
 export async function deleteStorageLocation(id: number): Promise<void> {
+  const location = await db.storageLocations.get(id);
+  if (!location) return;
   await db.storageLocations.delete(id);
+  if (location.syncId) {
+    await enqueueSyncChange({
+      entityType: 'storageLocation',
+      entitySyncId: location.syncId,
+      op: 'delete',
+      updatedAt: new Date().toISOString(),
+    });
+  }
 }
 
 // Consumption Log
 export async function logConsumption(
   log: Omit<ConsumptionLog, 'id'>
 ): Promise<number> {
-  return db.consumptionLogs.add(log);
+  const now = new Date().toISOString();
+  let productSyncId = log.productSyncId;
+  if (!productSyncId && typeof log.productId === 'number') {
+    const product = await db.products.get(log.productId);
+    productSyncId = product?.syncId;
+  }
+
+  const next: Omit<ConsumptionLog, 'id'> = {
+    ...log,
+    syncId: log.syncId ?? createSyncId(),
+    productSyncId,
+    updatedAt: log.updatedAt ?? now,
+  };
+
+  const id = await db.consumptionLogs.add(next);
+  await enqueueSyncChange({
+    entityType: 'consumptionLog',
+    entitySyncId: next.syncId!,
+    op: 'upsert',
+    updatedAt: next.updatedAt!,
+    payload: toSyncLogPayload(next),
+  });
+  return id;
+}
+
+// Remote sync apply helpers
+export async function applyProductUpsertFromSync(
+  payload: Record<string, unknown>
+): Promise<void> {
+  const syncId = typeof payload.syncId === 'string' ? payload.syncId : '';
+  if (!syncId) return;
+
+  const existing = await db.products.where('syncId').equals(syncId).first();
+  const now = new Date().toISOString();
+
+  const next: Omit<Product, 'id'> = {
+    syncId,
+    name: typeof payload.name === 'string' ? payload.name : existing?.name ?? 'Produkt',
+    // For optional fields: null means explicitly cleared; absent key falls back to existing value.
+    barcode: 'barcode' in payload ? (typeof payload.barcode === 'string' ? payload.barcode : undefined) : existing?.barcode,
+    category:
+      typeof payload.category === 'string'
+        ? (payload.category as Product['category'])
+        : existing?.category ?? 'sonstiges',
+    storageLocation:
+      typeof payload.storageLocation === 'string'
+        ? payload.storageLocation
+        : existing?.storageLocation ?? 'Keller',
+    quantity: normalizeNumber(payload.quantity, existing?.quantity ?? 1),
+    unit: typeof payload.unit === 'string' ? payload.unit : existing?.unit ?? 'Stück',
+    expiryDate:
+      typeof payload.expiryDate === 'string'
+        ? payload.expiryDate
+        : existing?.expiryDate ?? now,
+    expiryPrecision:
+      payload.expiryPrecision === 'month' || payload.expiryPrecision === 'year'
+        ? (payload.expiryPrecision as Product['expiryPrecision'])
+        : payload.expiryPrecision === 'day'
+          ? 'day'
+          : existing?.expiryPrecision ?? 'day',
+    photo: 'photo' in payload ? (typeof payload.photo === 'string' ? payload.photo : undefined) : existing?.photo,
+    minStock: 'minStock' in payload
+      ? (typeof payload.minStock === 'number' && Number.isFinite(payload.minStock) ? payload.minStock : undefined)
+      : existing?.minStock,
+    notes: 'notes' in payload ? (typeof payload.notes === 'string' ? payload.notes : undefined) : existing?.notes,
+    archived: typeof payload.archived === 'boolean' ? payload.archived : existing?.archived ?? false,
+    createdAt: toIso(payload.createdAt, existing?.createdAt ?? now),
+    updatedAt: toIso(payload.updatedAt, existing?.updatedAt ?? now),
+  };
+
+  if (existing?.id !== undefined) {
+    await db.products.update(existing.id, next);
+    return;
+  }
+
+  await db.products.add(next);
+}
+
+export async function applyProductDeleteFromSync(syncId: string): Promise<void> {
+  const product = await db.products.where('syncId').equals(syncId).first();
+  const productLogs = await db.consumptionLogs.where('productSyncId').equals(syncId).toArray();
+
+  await db.transaction(
+    'rw',
+    db.products,
+    db.consumptionLogs,
+    db.notificationSchedules,
+    async () => {
+      if (product?.id !== undefined) {
+        await db.products.delete(product.id);
+        await db.consumptionLogs.where('productId').equals(product.id).delete();
+        await db.notificationSchedules.where('productId').equals(product.id).delete();
+      }
+
+      if (productLogs.length > 0) {
+        await db.consumptionLogs.bulkDelete(
+          productLogs.map((log) => log.id).filter((id): id is number => typeof id === 'number')
+        );
+      }
+    }
+  );
+}
+
+export async function applyStorageLocationUpsertFromSync(
+  payload: Record<string, unknown>
+): Promise<void> {
+  const syncId = typeof payload.syncId === 'string' ? payload.syncId : '';
+  if (!syncId) return;
+  const now = new Date().toISOString();
+  const incomingName = typeof payload.name === 'string' ? payload.name : '';
+  if (!incomingName) return;
+
+  const bySyncId = await db.storageLocations.where('syncId').equals(syncId).first();
+  let existing = bySyncId;
+  if (!existing) {
+    const byName = await db.storageLocations.where('name').equals(incomingName).first();
+    existing = byName;
+  }
+
+  const next: Omit<StorageLocation, 'id'> = {
+    syncId,
+    name: incomingName,
+    icon: typeof payload.icon === 'string' ? payload.icon : existing?.icon,
+    createdAt: toIso(payload.createdAt, existing?.createdAt ?? now),
+    updatedAt: toIso(payload.updatedAt, existing?.updatedAt ?? now),
+  };
+
+  if (existing?.id !== undefined) {
+    await db.storageLocations.update(existing.id, next);
+    return;
+  }
+
+  await db.storageLocations.add(next);
+}
+
+export async function applyStorageLocationDeleteFromSync(syncId: string): Promise<void> {
+  const location = await db.storageLocations.where('syncId').equals(syncId).first();
+  if (location?.id !== undefined) {
+    await db.storageLocations.delete(location.id);
+  }
+}
+
+export async function applyConsumptionLogUpsertFromSync(
+  payload: Record<string, unknown>
+): Promise<void> {
+  const syncId = typeof payload.syncId === 'string' ? payload.syncId : '';
+  if (!syncId) return;
+  const now = new Date().toISOString();
+  const existing = await db.consumptionLogs.where('syncId').equals(syncId).first();
+
+  const productSyncId =
+    typeof payload.productSyncId === 'string'
+      ? payload.productSyncId
+      : existing?.productSyncId;
+
+  let productId = typeof payload.productId === 'number' ? payload.productId : existing?.productId;
+  if (productSyncId) {
+    const product = await db.products.where('syncId').equals(productSyncId).first();
+    if (product?.id !== undefined) {
+      productId = product.id;
+    }
+  }
+
+  const fallbackReason: ConsumptionLog['reason'] = existing?.reason ?? 'sonstiges';
+  const next: Omit<ConsumptionLog, 'id'> = {
+    syncId,
+    productId,
+    productSyncId,
+    productName:
+      typeof payload.productName === 'string'
+        ? payload.productName
+        : existing?.productName ?? 'Produkt',
+    quantity: normalizeNumber(payload.quantity, existing?.quantity ?? 1),
+    unit: typeof payload.unit === 'string' ? payload.unit : existing?.unit ?? 'Stück',
+    consumedAt: toIso(payload.consumedAt, existing?.consumedAt ?? now),
+    updatedAt: toIso(payload.updatedAt, existing?.updatedAt ?? now),
+    reason: normalizeReason(payload.reason, fallbackReason),
+  };
+
+  if (existing?.id !== undefined) {
+    await db.consumptionLogs.update(existing.id, next);
+    return;
+  }
+
+  await db.consumptionLogs.add(next);
+}
+
+export async function applyConsumptionLogDeleteFromSync(syncId: string): Promise<void> {
+  const log = await db.consumptionLogs.where('syncId').equals(syncId).first();
+  if (log?.id !== undefined) {
+    await db.consumptionLogs.delete(log.id);
+  }
 }
 
 // Export/Import
@@ -189,7 +696,13 @@ export async function exportCSV(): Promise<string> {
     escCsv(p.quantity),
     escCsv(t(`units.${p.unit}`)),
     escCsv(fmtDate(p.expiryDate)),
-    escCsv(p.expiryPrecision === 'day' ? t('form.precisionDay') : p.expiryPrecision === 'month' ? t('form.precisionMonth') : t('form.precisionYear')),
+    escCsv(
+      p.expiryPrecision === 'day'
+        ? t('form.precisionDay')
+        : p.expiryPrecision === 'month'
+          ? t('form.precisionMonth')
+          : t('form.precisionYear')
+    ),
     escCsv(p.minStock ?? ''),
     escCsv(p.notes),
     escCsv(p.archived ? t('common.yes') : t('common.no')),
@@ -216,6 +729,9 @@ export async function importData(jsonString: string): Promise<number> {
   const products = data.products as Record<string, unknown>[];
   const storageLocations = (data.storageLocations ?? []) as Record<string, unknown>[];
   const consumptionLogs = (data.consumptionLogs ?? []) as Record<string, unknown>[];
+  const queuedSyncChanges: Omit<SyncQueueRow, 'id'>[] = [];
+  const importedProductSyncIdByLegacyId = new Map<number, string>();
+  const localProductIdBySyncId = new Map<string, number>();
 
   let imported = 0;
   let skipped = 0;
@@ -234,21 +750,33 @@ export async function importData(jsonString: string): Promise<number> {
           .equals(loc.name)
           .first();
         if (!existing) {
-          await db.storageLocations.add({
+          const now = new Date().toISOString();
+          const next: Omit<StorageLocation, 'id'> = {
+            syncId: typeof loc.syncId === 'string' ? loc.syncId : createSyncId(),
             name: loc.name,
-            createdAt: (loc.createdAt as string) || new Date().toISOString(),
+            createdAt: (loc.createdAt as string) || now,
+            updatedAt: (loc.updatedAt as string) || (loc.createdAt as string) || now,
+          };
+          await db.storageLocations.add(next);
+          queuedSyncChanges.push({
+            entityType: 'storageLocation',
+            entitySyncId: next.syncId!,
+            op: 'upsert',
+            updatedAt: next.updatedAt!,
+            payload: toSyncLocationPayload(next),
           });
         }
       }
 
       // Import products (skip duplicates based on name + expiryDate + storageLocation)
       for (const product of products) {
+        const legacyProductId = typeof product.id === 'number' ? product.id : undefined;
         if (
           !product.name ||
           typeof product.name !== 'string' ||
           !product.expiryDate ||
           typeof product.expiryDate !== 'string' ||
-          isNaN(new Date(String(product.expiryDate)).getTime())
+          Number.isNaN(new Date(String(product.expiryDate)).getTime())
         ) {
           skipped++;
           continue;
@@ -259,51 +787,131 @@ export async function importData(jsonString: string): Promise<number> {
           .where('name')
           .equals(product.name as string)
           .toArray();
-        const isDuplicate = existingProducts.some(
+        const duplicateProduct = existingProducts.find(
           (p) =>
             p.expiryDate === product.expiryDate &&
             p.storageLocation === product.storageLocation
         );
+        const isDuplicate = Boolean(duplicateProduct);
 
         if (isDuplicate) {
           skipped++;
+          if (legacyProductId !== undefined && duplicateProduct?.syncId) {
+            importedProductSyncIdByLegacyId.set(legacyProductId, duplicateProduct.syncId);
+            if (typeof duplicateProduct.id === 'number') {
+              localProductIdBySyncId.set(duplicateProduct.syncId, duplicateProduct.id);
+            }
+          }
           continue;
         }
 
         // Clean up photo field - don't import placeholder markers
         const rawPhoto = product.photo;
-        const photo = rawPhoto && rawPhoto !== '[FOTO]' && typeof rawPhoto === 'string' ? rawPhoto : undefined;
+        const photo =
+          rawPhoto && rawPhoto !== '[FOTO]' && typeof rawPhoto === 'string'
+            ? rawPhoto
+            : undefined;
         const now = new Date().toISOString();
 
         // Only import known fields to prevent injection of unexpected data
-        await db.products.add({
+        const next: Omit<Product, 'id'> = {
+          syncId: typeof product.syncId === 'string' ? product.syncId : createSyncId(),
           name: String(product.name),
           barcode: typeof product.barcode === 'string' ? product.barcode : undefined,
-          category: typeof product.category === 'string' ? product.category as Product['category'] : 'sonstiges',
-          storageLocation: typeof product.storageLocation === 'string' ? product.storageLocation : 'Keller',
+          category:
+            typeof product.category === 'string'
+              ? (product.category as Product['category'])
+              : 'sonstiges',
+          storageLocation:
+            typeof product.storageLocation === 'string'
+              ? product.storageLocation
+              : 'Keller',
           quantity: typeof product.quantity === 'number' ? product.quantity : 1,
           unit: typeof product.unit === 'string' ? product.unit : 'Stück',
           expiryDate: String(product.expiryDate),
-          expiryPrecision: ['day', 'month', 'year'].includes(product.expiryPrecision as string) ? product.expiryPrecision as Product['expiryPrecision'] : 'day',
+          expiryPrecision: ['day', 'month', 'year'].includes(product.expiryPrecision as string)
+            ? (product.expiryPrecision as Product['expiryPrecision'])
+            : 'day',
           photo,
           minStock: typeof product.minStock === 'number' ? product.minStock : undefined,
           notes: typeof product.notes === 'string' ? product.notes : undefined,
           archived: product.archived === true || product.archived === 1,
           createdAt: typeof product.createdAt === 'string' ? product.createdAt : now,
           updatedAt: typeof product.updatedAt === 'string' ? product.updatedAt : now,
-        });
+        };
+        const insertedProductId = await db.products.add(next);
+        if (legacyProductId !== undefined) {
+          importedProductSyncIdByLegacyId.set(legacyProductId, next.syncId!);
+        }
+        if (typeof insertedProductId === 'number') {
+          localProductIdBySyncId.set(next.syncId!, insertedProductId);
+        }
         imported++;
+        queuedSyncChanges.push({
+          entityType: 'product',
+          entitySyncId: next.syncId!,
+          op: 'upsert',
+          updatedAt: next.updatedAt,
+          payload: toSyncProductPayload(next),
+        });
       }
 
       // Import consumption logs
       for (const log of consumptionLogs) {
-        if (!log.productId || !log.consumedAt) continue;
-        const { id: _id, ...logData } = log;
-        await db.consumptionLogs.add(logData as Omit<ConsumptionLog, 'id'>);
+        if (!log.consumedAt) continue;
+        const now = new Date().toISOString();
+        const legacyLogProductId =
+          typeof log.productId === 'number' ? log.productId : undefined;
+        let resolvedProductSyncId =
+          typeof log.productSyncId === 'string' ? log.productSyncId : undefined;
+        if (!resolvedProductSyncId && legacyLogProductId !== undefined) {
+          resolvedProductSyncId = importedProductSyncIdByLegacyId.get(legacyLogProductId);
+        }
+
+        let resolvedLocalProductId: number | undefined;
+        if (resolvedProductSyncId) {
+          const mappedLocalId = localProductIdBySyncId.get(resolvedProductSyncId);
+          if (mappedLocalId !== undefined) {
+            resolvedLocalProductId = mappedLocalId;
+          } else {
+            const existingProduct = await db.products
+              .where('syncId')
+              .equals(resolvedProductSyncId)
+              .first();
+            if (typeof existingProduct?.id === 'number') {
+              resolvedLocalProductId = existingProduct.id;
+              localProductIdBySyncId.set(resolvedProductSyncId, existingProduct.id);
+            }
+          }
+        }
+
+        const next: Omit<ConsumptionLog, 'id'> = {
+          syncId: typeof log.syncId === 'string' ? log.syncId : createSyncId(),
+          productId: resolvedLocalProductId,
+          productSyncId: resolvedProductSyncId,
+          productName: typeof log.productName === 'string' ? log.productName : 'Produkt',
+          quantity: typeof log.quantity === 'number' ? log.quantity : 1,
+          unit: typeof log.unit === 'string' ? log.unit : 'Stück',
+          consumedAt: typeof log.consumedAt === 'string' ? log.consumedAt : now,
+          updatedAt: typeof log.updatedAt === 'string' ? log.updatedAt : now,
+          reason: normalizeReason(log.reason, 'sonstiges'),
+        };
+        await db.consumptionLogs.add(next);
+        queuedSyncChanges.push({
+          entityType: 'consumptionLog',
+          entitySyncId: next.syncId!,
+          op: 'upsert',
+          updatedAt: next.updatedAt!,
+          payload: toSyncLogPayload(next),
+        });
       }
     }
   );
 
+  if (shouldQueueSyncChange() && queuedSyncChanges.length > 0) {
+    await db.syncQueue.bulkAdd(queuedSyncChanges);
+  }
+
   if (skipped > 0) {
     throw new ImportResult(imported, skipped);
   }
diff --git a/src/lib/sync.test.ts b/src/lib/sync.test.ts
new file mode 100644
index 0000000..0f3f4f2
--- /dev/null
+++ b/src/lib/sync.test.ts
@@ -0,0 +1,181 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const dbMock = vi.hoisted(() => ({
+  applyConsumptionLogDeleteFromSync: vi.fn(),
+  applyConsumptionLogUpsertFromSync: vi.fn(),
+  applyProductDeleteFromSync: vi.fn(),
+  applyProductUpsertFromSync: vi.fn(),
+  applyStorageLocationDeleteFromSync: vi.fn(),
+  applyStorageLocationUpsertFromSync: vi.fn(),
+  getQueuedSyncChanges: vi.fn(),
+  getSyncMetaValue: vi.fn(),
+  getSyncQueueCount: vi.fn(),
+  queueFullSnapshotForSync: vi.fn(),
+  removeQueuedSyncChanges: vi.fn(),
+  setSyncMetaValue: vi.fn(),
+  withSyncQueueSuppressed: vi.fn(async (fn: () => Promise<unknown>) => fn()),
+}));
+
+const syncConfigMock = vi.hoisted(() => ({
+  getSyncConfig: vi.fn(),
+  saveSyncConfig: vi.fn(),
+}));
+
+vi.mock('./db', () => dbMock);
+vi.mock('./syncConfig', () => syncConfigMock);
+
+function mockFetchResponse(payload: unknown, ok = true, status = 200): Response {
+  return {
+    ok,
+    status,
+    json: async () => payload,
+  } as Response;
+}
+
+beforeEach(() => {
+  vi.resetModules();
+  vi.clearAllMocks();
+
+  Object.defineProperty(globalThis, 'navigator', {
+    value: { onLine: true },
+    configurable: true,
+  });
+
+  globalThis.fetch = vi.fn() as typeof fetch;
+
+  dbMock.getQueuedSyncChanges.mockResolvedValue([]);
+  dbMock.getSyncQueueCount.mockResolvedValue(0);
+  dbMock.getSyncMetaValue.mockImplementation(async (key: string) => {
+    if (key === 'sync_cursor') return '0';
+    if (key === 'sync_full_snapshot_pending') return '0';
+    return undefined;
+  });
+  syncConfigMock.getSyncConfig.mockReturnValue({
+    enabled: true,
+    serverUrl: 'http://localhost:8787',
+    householdId: 'house-1',
+    deviceId: 'device-1',
+    deviceToken: 'token-1',
+    deviceName: 'Desktop',
+    intervalMs: 120000,
+  });
+  syncConfigMock.saveSyncConfig.mockImplementation((value: unknown) => value);
+});
+
+describe('sync runtime', () => {
+  it('pairs a device and stores credentials', async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce(
+      mockFetchResponse({
+        householdId: 'house-abc',
+        deviceId: 'device-xyz',
+        deviceToken: 'token-xyz',
+      })
+    );
+
+    const { pairSyncDevice } = await import('./sync');
+
+    await pairSyncDevice({
+      serverUrl: 'http://192.168.0.20:8787/',
+      syncCode: 'HOUSE-1234',
+      deviceName: 'Phone',
+    });
+
+    expect(syncConfigMock.saveSyncConfig).toHaveBeenCalledWith(
+      expect.objectContaining({
+        enabled: true,
+        serverUrl: 'http://192.168.0.20:8787',
+        householdId: 'house-abc',
+        deviceId: 'device-xyz',
+        deviceToken: 'token-xyz',
+        deviceName: 'Phone',
+      })
+    );
+    expect(dbMock.setSyncMetaValue).toHaveBeenCalledWith('sync_cursor', '0');
+    expect(dbMock.setSyncMetaValue).toHaveBeenCalledWith('sync_full_snapshot_pending', '1');
+  });
+
+  it('runs pull/push/pull cycle and deduplicates queued changes', async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>)
+      .mockResolvedValueOnce(
+        mockFetchResponse({
+          cursor: 3,
+          changes: [
+            {
+              seq: 3,
+              entityType: 'product',
+              entityId: 'prod-1',
+              op: 'upsert',
+              payload: { syncId: 'prod-1', name: 'Reis', quantity: 1 },
+              updatedAt: '2026-03-10T12:00:00.000Z',
+              updatedByDeviceId: 'device-remote',
+            },
+          ],
+        })
+      )
+      .mockResolvedValueOnce(mockFetchResponse({ received: 1, applied: 1 }))
+      .mockResolvedValueOnce(mockFetchResponse({ cursor: 3, changes: [] }));
+
+    dbMock.getQueuedSyncChanges
+      .mockResolvedValueOnce([
+        {
+          id: 1,
+          entityType: 'product',
+          entitySyncId: 'prod-1',
+          op: 'upsert',
+          updatedAt: '2026-03-10T12:00:00.000Z',
+          payload: { syncId: 'prod-1', quantity: 1 },
+        },
+        {
+          id: 2,
+          entityType: 'product',
+          entitySyncId: 'prod-1',
+          op: 'upsert',
+          updatedAt: '2026-03-10T12:01:00.000Z',
+          payload: { syncId: 'prod-1', quantity: 2 },
+        },
+      ])
+      .mockResolvedValueOnce([]);
+
+    const { runSyncNow, subscribeSyncRuntime, getSyncRuntimeState } = await import('./sync');
+    const observedStatuses: string[] = [];
+    const unsubscribe = subscribeSyncRuntime((state) => {
+      observedStatuses.push(state.status);
+    });
+
+    await runSyncNow('test');
+    unsubscribe();
+
+    expect(dbMock.applyProductUpsertFromSync).toHaveBeenCalledWith(
+      expect.objectContaining({ syncId: 'prod-1' })
+    );
+    expect(dbMock.removeQueuedSyncChanges).toHaveBeenCalledWith([1, 2]);
+
+    const pushCall = (globalThis.fetch as ReturnType<typeof vi.fn>).mock.calls.find(
+      ([url, init]) => String(url).includes('/v1/sync/push') && (init as RequestInit).method === 'POST'
+    );
+    expect(pushCall).toBeDefined();
+    const pushBody = JSON.parse((pushCall![1] as RequestInit).body as string);
+    expect(pushBody.changes).toHaveLength(1);
+    expect(pushBody.changes[0].updatedAt).toBe('2026-03-10T12:01:00.000Z');
+    expect(pushBody.changes[0].payload.quantity).toBe(2);
+
+    expect(dbMock.setSyncMetaValue).toHaveBeenCalledWith('sync_cursor', '3');
+    expect(observedStatuses).toContain('syncing');
+    expect(getSyncRuntimeState().status).toBe('idle');
+  });
+
+  it('does not sync while offline and keeps pending count', async () => {
+    Object.defineProperty(globalThis, 'navigator', {
+      value: { onLine: false },
+      configurable: true,
+    });
+    dbMock.getSyncQueueCount.mockResolvedValue(7);
+
+    const { runSyncNow, getSyncRuntimeState } = await import('./sync');
+    await runSyncNow('offline-check');
+
+    expect(globalThis.fetch).not.toHaveBeenCalled();
+    expect(getSyncRuntimeState().status).toBe('idle');
+    expect(getSyncRuntimeState().pendingChanges).toBe(7);
+  });
+});
diff --git a/src/lib/sync.ts b/src/lib/sync.ts
new file mode 100644
index 0000000..632bdd9
--- /dev/null
+++ b/src/lib/sync.ts
@@ -0,0 +1,414 @@
+import {
+  applyConsumptionLogDeleteFromSync,
+  applyConsumptionLogUpsertFromSync,
+  applyProductDeleteFromSync,
+  applyProductUpsertFromSync,
+  applyStorageLocationDeleteFromSync,
+  applyStorageLocationUpsertFromSync,
+  getQueuedSyncChanges,
+  getSyncMetaValue,
+  getSyncQueueCount,
+  queueFullSnapshotForSync,
+  removeQueuedSyncChanges,
+  setSyncMetaValue,
+  withSyncQueueSuppressed,
+} from './db';
+import { getSyncConfig, saveSyncConfig } from './syncConfig';
+import type { SyncEntityType, SyncOperation } from '../types';
+
+interface PairResponse {
+  householdId: string;
+  deviceId: string;
+  deviceToken: string;
+}
+
+interface PushRequestChange {
+  entityType: SyncEntityType;
+  entityId: string;
+  op: SyncOperation;
+  updatedAt: string;
+  payload?: Record<string, unknown>;
+}
+
+interface PullResponseChange {
+  seq: number;
+  entityType: SyncEntityType;
+  entityId: string;
+  op: SyncOperation;
+  updatedAt: string;
+  updatedByDeviceId: string;
+  payload?: Record<string, unknown> | null;
+}
+
+interface PullResponse {
+  cursor: number;
+  changes: PullResponseChange[];
+}
+
+export interface SyncRuntimeState {
+  status: 'disabled' | 'idle' | 'syncing' | 'error';
+  lastAttemptAt?: string;
+  lastSuccessAt?: string;
+  lastError?: string;
+  pendingChanges: number;
+}
+
+const runtimeState: SyncRuntimeState = {
+  status: 'disabled',
+  pendingChanges: 0,
+};
+
+const listeners = new Set<(state: SyncRuntimeState) => void>();
+let syncInterval: ReturnType<typeof setInterval> | null = null;
+let onlineHandler: (() => void) | null = null;
+let visibilityHandler: (() => void) | null = null;
+let inFlightSync: Promise<void> | null = null;
+
+function emitRuntimeState(partial: Partial<SyncRuntimeState>): void {
+  Object.assign(runtimeState, partial);
+  const snapshot = { ...runtimeState };
+  for (const listener of listeners) {
+    listener(snapshot);
+  }
+}
+
+function buildAuthHeaders(cfg: ReturnType<typeof getSyncConfig>): Record<string, string> {
+  return {
+    Authorization: `Bearer ${cfg.deviceToken}`,
+    'x-household-id': cfg.householdId,
+    'Content-Type': 'application/json',
+  };
+}
+
+function dedupeQueueChanges(
+  rows: Awaited<ReturnType<typeof getQueuedSyncChanges>>
+): { changes: PushRequestChange[]; consumedIds: number[] } {
+  const byKey = new Map<
+    string,
+    { rowId: number; change: PushRequestChange; consumedIds: number[] }
+  >();
+
+  for (const row of rows) {
+    if (row.id === undefined) continue;
+    const key = `${row.entityType}:${row.entitySyncId}`;
+    const change: PushRequestChange = {
+      entityType: row.entityType,
+      entityId: row.entitySyncId,
+      op: row.op,
+      updatedAt: row.updatedAt,
+      payload: row.payload,
+    };
+
+    const existing = byKey.get(key);
+    if (!existing) {
+      byKey.set(key, {
+        rowId: row.id,
+        change,
+        consumedIds: [row.id],
+      });
+      continue;
+    }
+
+    existing.consumedIds.push(row.id);
+    if (row.id > existing.rowId) {
+      existing.rowId = row.id;
+      existing.change = change;
+    }
+  }
+
+  const entries = Array.from(byKey.values()).sort((a, b) => a.rowId - b.rowId);
+  return {
+    changes: entries.map((entry) => entry.change),
+    consumedIds: entries.flatMap((entry) => entry.consumedIds),
+  };
+}
+
+async function applyPulledChanges(changes: PullResponseChange[]): Promise<void> {
+  await withSyncQueueSuppressed(async () => {
+    for (const change of changes) {
+      const entityId = change.entityId;
+      if (!entityId) continue;
+
+      if (change.entityType === 'product') {
+        if (change.op === 'delete') {
+          await applyProductDeleteFromSync(entityId);
+        } else if (change.payload && typeof change.payload === 'object') {
+          await applyProductUpsertFromSync(change.payload);
+        }
+        continue;
+      }
+
+      if (change.entityType === 'storageLocation') {
+        if (change.op === 'delete') {
+          await applyStorageLocationDeleteFromSync(entityId);
+        } else if (change.payload && typeof change.payload === 'object') {
+          await applyStorageLocationUpsertFromSync(change.payload);
+        }
+        continue;
+      }
+
+      if (change.entityType === 'consumptionLog') {
+        if (change.op === 'delete') {
+          await applyConsumptionLogDeleteFromSync(entityId);
+        } else if (change.payload && typeof change.payload === 'object') {
+          await applyConsumptionLogUpsertFromSync(change.payload);
+        }
+      }
+    }
+  });
+}
+
+async function pullChanges(cursor: number): Promise<PullResponse> {
+  const cfg = getSyncConfig();
+  const res = await fetch(
+    `${cfg.serverUrl}/v1/sync/pull?cursor=${encodeURIComponent(String(cursor))}`,
+    {
+      method: 'GET',
+      headers: buildAuthHeaders(cfg),
+    }
+  );
+
+  if (!res.ok) {
+    throw new Error(`Pull fehlgeschlagen (${res.status})`);
+  }
+
+  const payload = (await res.json()) as Partial<PullResponse>;
+  return {
+    cursor:
+      typeof payload.cursor === 'number' && Number.isFinite(payload.cursor)
+        ? payload.cursor
+        : cursor,
+    changes: Array.isArray(payload.changes)
+      ? payload.changes.filter(
+          (item): item is PullResponseChange =>
+            Boolean(item) &&
+            typeof item === 'object' &&
+            typeof item.entityType === 'string' &&
+            typeof item.entityId === 'string' &&
+            typeof item.op === 'string'
+        )
+      : [],
+  };
+}
+
+async function pushChanges(changes: PushRequestChange[]): Promise<void> {
+  if (changes.length === 0) return;
+  const cfg = getSyncConfig();
+  const res = await fetch(`${cfg.serverUrl}/v1/sync/push`, {
+    method: 'POST',
+    headers: buildAuthHeaders(cfg),
+    body: JSON.stringify({ changes }),
+  });
+  if (!res.ok) {
+    throw new Error(`Push fehlgeschlagen (${res.status})`);
+  }
+}
+
+export async function pairSyncDevice(params: {
+  serverUrl: string;
+  syncCode: string;
+  deviceName: string;
+}): Promise<void> {
+  const serverUrl = params.serverUrl.trim().replace(/\/+$/, '');
+  if (!serverUrl) {
+    throw new Error('Server URL fehlt.');
+  }
+  if (!params.syncCode.trim()) {
+    throw new Error('Sync-Code fehlt.');
+  }
+  if (!params.deviceName.trim()) {
+    throw new Error('Gerätename fehlt.');
+  }
+
+  const res = await fetch(`${serverUrl}/v1/pair`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+      syncCode: params.syncCode.trim(),
+      deviceName: params.deviceName.trim(),
+    }),
+  });
+
+  if (!res.ok) {
+    throw new Error(`Pairing fehlgeschlagen (${res.status})`);
+  }
+
+  const payload = (await res.json()) as Partial<PairResponse>;
+  if (!payload.deviceToken || !payload.deviceId || !payload.householdId) {
+    throw new Error('Ungültige Pairing-Antwort vom Server.');
+  }
+
+  saveSyncConfig({
+    enabled: true,
+    serverUrl,
+    householdId: payload.householdId,
+    deviceId: payload.deviceId,
+    deviceToken: payload.deviceToken,
+    deviceName: params.deviceName.trim(),
+  });
+
+  await setSyncMetaValue('sync_cursor', '0');
+  await setSyncMetaValue('sync_full_snapshot_pending', '1');
+
+  emitRuntimeState({
+    status: 'idle',
+    lastError: undefined,
+  });
+}
+
+export async function runSyncNow(reason = 'manual'): Promise<void> {
+  if (inFlightSync) {
+    return inFlightSync;
+  }
+
+  const cfg = getSyncConfig();
+  if (!cfg.enabled) {
+    emitRuntimeState({ status: 'disabled', pendingChanges: 0 });
+    return;
+  }
+
+  if (!cfg.serverUrl || !cfg.deviceToken || !cfg.householdId) {
+    emitRuntimeState({
+      status: 'error',
+      lastError: 'Sync ist aktiviert, aber unvollständig konfiguriert.',
+    });
+    return;
+  }
+
+  if (typeof navigator !== 'undefined' && navigator.onLine === false) {
+    const pending = await getSyncQueueCount();
+    emitRuntimeState({
+      status: 'idle',
+      pendingChanges: pending,
+    });
+    return;
+  }
+
+  inFlightSync = (async () => {
+    const startedAt = new Date().toISOString();
+    emitRuntimeState({
+      status: 'syncing',
+      lastAttemptAt: startedAt,
+    });
+
+    try {
+      let cursorRaw = await getSyncMetaValue('sync_cursor');
+      let cursor = Number.parseInt(cursorRaw ?? '0', 10);
+      if (!Number.isFinite(cursor) || cursor < 0) cursor = 0;
+
+      const firstPull = await pullChanges(cursor);
+      if (firstPull.changes.length > 0) {
+        await applyPulledChanges(firstPull.changes);
+      }
+      cursor = firstPull.cursor;
+      await setSyncMetaValue('sync_cursor', String(cursor));
+
+      const fullSnapshotPending = (await getSyncMetaValue('sync_full_snapshot_pending')) === '1';
+      if (fullSnapshotPending) {
+        await queueFullSnapshotForSync(true);
+        await setSyncMetaValue('sync_full_snapshot_pending', '0');
+      }
+
+      while (true) {
+        const queued = await getQueuedSyncChanges(500);
+        if (queued.length === 0) break;
+
+        const deduped = dedupeQueueChanges(queued);
+        if (deduped.changes.length === 0) {
+          await removeQueuedSyncChanges(deduped.consumedIds);
+          continue;
+        }
+
+        await pushChanges(deduped.changes);
+        await removeQueuedSyncChanges(deduped.consumedIds);
+      }
+
+      const secondPull = await pullChanges(cursor);
+      if (secondPull.changes.length > 0) {
+        await applyPulledChanges(secondPull.changes);
+      }
+      cursor = secondPull.cursor;
+      await setSyncMetaValue('sync_cursor', String(cursor));
+
+      const pending = await getSyncQueueCount();
+      emitRuntimeState({
+        status: 'idle',
+        pendingChanges: pending,
+        lastSuccessAt: new Date().toISOString(),
+        lastError: undefined,
+      });
+    } catch (error) {
+      const pending = await getSyncQueueCount();
+      const message =
+        error instanceof Error ? error.message : `Sync fehlgeschlagen (${reason})`;
+      emitRuntimeState({
+        status: 'error',
+        pendingChanges: pending,
+        lastError: message,
+      });
+      throw error;
+    } finally {
+      inFlightSync = null;
+    }
+  })();
+
+  return inFlightSync;
+}
+
+export function getSyncRuntimeState(): SyncRuntimeState {
+  return { ...runtimeState };
+}
+
+export function subscribeSyncRuntime(
+  listener: (state: SyncRuntimeState) => void
+): () => void {
+  listeners.add(listener);
+  listener({ ...runtimeState });
+  return () => {
+    listeners.delete(listener);
+  };
+}
+
+export function startSyncEngine(): () => void {
+  if (syncInterval) {
+    return () => undefined;
+  }
+
+  const cfg = getSyncConfig();
+  emitRuntimeState({
+    status: cfg.enabled ? 'idle' : 'disabled',
+  });
+
+  void runSyncNow('startup').catch(() => undefined);
+
+  syncInterval = setInterval(() => {
+    void runSyncNow('interval').catch(() => undefined);
+  }, cfg.intervalMs);
+
+  onlineHandler = () => {
+    void runSyncNow('online').catch(() => undefined);
+  };
+  window.addEventListener('online', onlineHandler);
+
+  visibilityHandler = () => {
+    if (document.visibilityState === 'visible') {
+      void runSyncNow('visibility').catch(() => undefined);
+    }
+  };
+  document.addEventListener('visibilitychange', visibilityHandler);
+
+  return () => {
+    if (syncInterval) {
+      clearInterval(syncInterval);
+      syncInterval = null;
+    }
+    if (onlineHandler) {
+      window.removeEventListener('online', onlineHandler);
+      onlineHandler = null;
+    }
+    if (visibilityHandler) {
+      document.removeEventListener('visibilitychange', visibilityHandler);
+      visibilityHandler = null;
+    }
+  };
+}
diff --git a/src/lib/syncConfig.test.ts b/src/lib/syncConfig.test.ts
new file mode 100644
index 0000000..1d743fd
--- /dev/null
+++ b/src/lib/syncConfig.test.ts
@@ -0,0 +1,98 @@
+import { beforeEach, describe, expect, it } from 'vitest';
+import {
+  clearSyncPairing,
+  getSyncConfig,
+  isSyncEnabled,
+  saveSyncConfig,
+} from './syncConfig';
+
+class MemoryStorage implements Storage {
+  private store = new Map<string, string>();
+
+  get length(): number {
+    return this.store.size;
+  }
+
+  clear(): void {
+    this.store.clear();
+  }
+
+  getItem(key: string): string | null {
+    return this.store.get(key) ?? null;
+  }
+
+  key(index: number): string | null {
+    return Array.from(this.store.keys())[index] ?? null;
+  }
+
+  removeItem(key: string): void {
+    this.store.delete(key);
+  }
+
+  setItem(key: string, value: string): void {
+    this.store.set(key, value);
+  }
+}
+
+beforeEach(() => {
+  Object.defineProperty(globalThis, 'localStorage', {
+    value: new MemoryStorage(),
+    configurable: true,
+  });
+});
+
+describe('syncConfig', () => {
+  it('returns safe defaults when no config exists', () => {
+    const cfg = getSyncConfig();
+    expect(cfg.enabled).toBe(false);
+    expect(cfg.serverUrl).toBe('');
+    expect(cfg.intervalMs).toBe(120000);
+  });
+
+  it('normalizes and persists settings', () => {
+    const cfg = saveSyncConfig({
+      enabled: true,
+      serverUrl: 'http://192.168.0.20:8787/',
+      householdId: 'house-1',
+      deviceId: 'device-1',
+      deviceToken: 'token-1',
+      deviceName: 'Phone',
+      intervalMs: 60000,
+    });
+
+    expect(cfg.serverUrl).toBe('http://192.168.0.20:8787');
+    expect(getSyncConfig().serverUrl).toBe('http://192.168.0.20:8787');
+  });
+
+  it('marks sync as enabled only when full credentials exist', () => {
+    saveSyncConfig({
+      enabled: true,
+      serverUrl: 'http://localhost:8787',
+      householdId: 'house-1',
+      deviceId: 'device-1',
+      deviceToken: 'token-1',
+      deviceName: 'Desktop',
+    });
+    expect(isSyncEnabled()).toBe(true);
+
+    saveSyncConfig({ deviceToken: '' });
+    expect(isSyncEnabled()).toBe(false);
+  });
+
+  it('clears pairing credentials', () => {
+    saveSyncConfig({
+      enabled: true,
+      serverUrl: 'http://localhost:8787',
+      householdId: 'house-1',
+      deviceId: 'device-1',
+      deviceToken: 'token-1',
+      deviceName: 'Desktop',
+    });
+
+    const cleared = clearSyncPairing();
+    expect(cleared.enabled).toBe(false);
+    expect(cleared.householdId).toBe('');
+    expect(cleared.deviceId).toBe('');
+    expect(cleared.deviceToken).toBe('');
+  });
+});
diff --git a/src/lib/syncConfig.ts b/src/lib/syncConfig.ts
new file mode 100644
index 0000000..5c45cbc
--- /dev/null
+++ b/src/lib/syncConfig.ts
@@ -0,0 +1,87 @@
+const SYNC_CONFIG_KEY = 'preptrack-sync-config';
+
+export interface SyncConfig {
+  enabled: boolean;
+  serverUrl: string;
+  householdId: string;
+  deviceId: string;
+  deviceToken: string;
+  deviceName: string;
+  intervalMs: number;
+}
+
+const DEFAULT_SYNC_CONFIG: SyncConfig = {
+  enabled: false,
+  serverUrl: '',
+  householdId: '',
+  deviceId: '',
+  deviceToken: '',
+  deviceName: '',
+  intervalMs: 2 * 60 * 1000,
+};
+
+function normalizeServerUrl(value: string): string {
+  return value.trim().replace(/\/+$/, '');
+}
+
+function readRawConfig(): Partial<SyncConfig> {
+  try {
+    const raw = localStorage.getItem(SYNC_CONFIG_KEY);
+    if (!raw) return {};
+    const parsed = JSON.parse(raw) as Partial<SyncConfig>;
+    return parsed ?? {};
+  } catch {
+    return {};
+  }
+}
+
+export function getSyncConfig(): SyncConfig {
+  const raw = readRawConfig();
+  return {
+    enabled: raw.enabled === true,
+    serverUrl: normalizeServerUrl(raw.serverUrl ?? ''),
+    householdId: String(raw.householdId ?? ''),
+    deviceId: String(raw.deviceId ?? ''),
+    deviceToken: String(raw.deviceToken ?? ''),
+    deviceName: String(raw.deviceName ?? ''),
+    intervalMs:
+      typeof raw.intervalMs === 'number' && Number.isFinite(raw.intervalMs) && raw.intervalMs >= 10_000
+        ? raw.intervalMs
+        : DEFAULT_SYNC_CONFIG.intervalMs,
+  };
+}
+
+export function saveSyncConfig(next: Partial<SyncConfig>): SyncConfig {
+  const merged = {
+    ...getSyncConfig(),
+    ...next,
+  };
+
+  const normalized: SyncConfig = {
+    ...merged,
+    serverUrl: normalizeServerUrl(merged.serverUrl),
+  };
+
+  localStorage.setItem(SYNC_CONFIG_KEY, JSON.stringify(normalized));
+  return normalized;
+}
+
+export function clearSyncPairing(): SyncConfig {
+  return saveSyncConfig({
+    enabled: false,
+    householdId: '',
+    deviceId: '',
+    deviceToken: '',
+  });
+}
+
+export function isSyncEnabled(): boolean {
+  const cfg = getSyncConfig();
+  return (
+    cfg.enabled &&
+    cfg.serverUrl.length > 0 &&
+    cfg.householdId.length > 0 &&
+    cfg.deviceId.length > 0 &&
+    cfg.deviceToken.length > 0
+  );
+}
diff --git a/src/types/index.ts b/src/types/index.ts
index 86cf35e..ccc074b 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -2,6 +2,7 @@ export type ExpiryStatus = 'expired' | 'critical' | 'warning' | 'soon' | 'good';
 
 export interface Product {
   id?: number;
+  syncId?: string;
   name: string;
   barcode?: string;
   category: ProductCategory;
@@ -71,9 +72,11 @@ export const DEFAULT_UNITS = [
 
 export interface StorageLocation {
   id?: number;
+  syncId?: string;
   name: string;
   icon?: string;
   createdAt: string;
+  updatedAt?: string;
 }
 
 export const DEFAULT_LOCATIONS = [
@@ -89,14 +92,20 @@ export const DEFAULT_LOCATIONS = [
 
 export interface ConsumptionLog {
   id?: number;
-  productId: number;
+  syncId?: string;
+  productId?: number;
+  productSyncId?: string;
   productName: string;
   quantity: number;
   unit: string;
   consumedAt: string;
+  updatedAt?: string;
   reason: 'verbraucht' | 'abgelaufen' | 'beschadigt' | 'sonstiges';
 }
 
+export type SyncEntityType = 'product' | 'storageLocation' | 'consumptionLog';
+export type SyncOperation = 'upsert' | 'delete';
+
 export interface NotificationSchedule {
   id?: number;
   productId: number;
diff --git a/sync-backend/.dockerignore b/sync-backend/.dockerignore
new file mode 100644
index 0000000..1a48b0e
--- /dev/null
+++ b/sync-backend/.dockerignore
@@ -0,0 +1,3 @@
+node_modules
+npm-debug.log*
+.env
diff --git a/sync-backend/Dockerfile b/sync-backend/Dockerfile
new file mode 100644
index 0000000..c93f1d8
--- /dev/null
+++ b/sync-backend/Dockerfile
@@ -0,0 +1,16 @@
+FROM node:22-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install --omit=dev
+
+COPY src ./src
+
+ENV PORT=8787
+ENV DB_PATH=/data/sync.db
+
+EXPOSE 8787
+VOLUME ["/data"]
+
+CMD ["npm", "start"]
diff --git a/sync-backend/README.md b/sync-backend/README.md
new file mode 100644
index 0000000..dbe1e60
--- /dev/null
+++ b/sync-backend/README.md
@@ -0,0 +1,35 @@
+# PrepTrack Sync Backend
+
+Minimal LAN-first sync backend for PrepTrack.
+
+## Run with Docker Compose
+
+From repo root:
+
+```bash
+docker compose -f docker-compose.sync.yml up -d --build
+```
+
+Health check:
+
+```bash
+curl http://localhost:8787/health
+```
+
+## Environment Variables
+
+- `PORT` (default `8787`)
+- `DB_PATH` (default `/data/sync.db`)
+- `CORS_ORIGINS` optional comma-separated allowlist (if unset, all origins are allowed)
+
+## API
+
+- `POST /v1/pair` `{ syncCode, deviceName }`
+- `POST /v1/sync/push` (auth required via `Authorization: Bearer <token>` + `x-household-id`)
+- `GET /v1/sync/pull?cursor=<n>` (same auth headers)
+
+## Tests
+
+```bash
+npm run test
+```
diff --git a/sync-backend/package-lock.json b/sync-backend/package-lock.json
new file mode 100644
index 0000000..d3e4b64
--- /dev/null
+++ b/sync-backend/package-lock.json
@@ -0,0 +1,2506 @@
+{
+  "name": "preptrack-sync-backend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "preptrack-sync-backend",
+      "version": "1.0.0",
+      "dependencies": {
+        "@fastify/cors": "^11.1.0",
+        "better-sqlite3": "^11.9.1",
+        "fastify": "^5.6.1"
+      },
+      "devDependencies": {
+        "vitest": "^2.1.8"
+      }
+    },
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+        "ppc64"
+      ],
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+}
diff --git a/sync-backend/package.json b/sync-backend/package.json
new file mode 100644
index 0000000..070e6eb
--- /dev/null
+++ b/sync-backend/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "preptrack-sync-backend",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "start": "node src/server.js",
+    "test": "vitest run src/server.test.js"
+  },
+  "dependencies": {
+    "@fastify/cors": "^11.1.0",
+    "better-sqlite3": "^11.9.1",
+    "fastify": "^5.6.1"
+  },
+  "devDependencies": {
+    "vitest": "^2.1.8"
+  }
+}
diff --git a/sync-backend/src/server.js b/sync-backend/src/server.js
new file mode 100644
index 0000000..ee37860
--- /dev/null
+++ b/sync-backend/src/server.js
@@ -0,0 +1,379 @@
+import crypto from 'node:crypto';
+import fs from 'node:fs';
+import path from 'node:path';
+import { pathToFileURL } from 'node:url';
+import Fastify from 'fastify';
+import cors from '@fastify/cors';
+import Database from 'better-sqlite3';
+
+const ENTITY_TYPES = new Set(['product', 'storageLocation', 'consumptionLog']);
+const OPERATIONS = new Set(['upsert', 'delete']);
+
+function nowIso() {
+  return new Date().toISOString();
+}
+
+function hashValue(value) {
+  return crypto.createHash('sha256').update(value).digest('hex');
+}
+
+function randomToken() {
+  return crypto.randomBytes(32).toString('base64url');
+}
+
+function parseDateScore(value) {
+  const ms = new Date(value).getTime();
+  if (Number.isNaN(ms)) return 0;
+  return ms;
+}
+
+export function shouldApplyChange(current, incomingUpdatedAt, incomingDeviceId) {
+  if (!current) return true;
+  const currentScore = parseDateScore(current.updated_at);
+  const incomingScore = parseDateScore(incomingUpdatedAt);
+  if (incomingScore > currentScore) return true;
+  if (incomingScore < currentScore) return false;
+  return String(incomingDeviceId) > String(current.updated_by_device_id);
+}
+
+function resolveDbPath(dbPath) {
+  let resolvedDbPath = dbPath;
+  try {
+    fs.mkdirSync(path.dirname(resolvedDbPath), { recursive: true });
+  } catch {
+    resolvedDbPath = path.resolve(process.cwd(), 'data/sync.db');
+    fs.mkdirSync(path.dirname(resolvedDbPath), { recursive: true });
+  }
+  return resolvedDbPath;
+}
+
+function initDb(dbPath) {
+  const db = new Database(dbPath);
+  db.pragma('journal_mode = WAL');
+  db.exec(`
+CREATE TABLE IF NOT EXISTS households (
+  id TEXT PRIMARY KEY,
+  sync_code_hash TEXT UNIQUE NOT NULL,
+  created_at TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS devices (
+  id TEXT PRIMARY KEY,
+  household_id TEXT NOT NULL,
+  device_name TEXT NOT NULL,
+  token_hash TEXT UNIQUE NOT NULL,
+  created_at TEXT NOT NULL,
+  last_seen_at TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS entities (
+  household_id TEXT NOT NULL,
+  entity_type TEXT NOT NULL,
+  entity_id TEXT NOT NULL,
+  payload_json TEXT,
+  updated_at TEXT NOT NULL,
+  deleted_at TEXT,
+  updated_by_device_id TEXT NOT NULL,
+  PRIMARY KEY (household_id, entity_type, entity_id)
+);
+
+CREATE TABLE IF NOT EXISTS changes (
+  seq INTEGER PRIMARY KEY AUTOINCREMENT,
+  household_id TEXT NOT NULL,
+  entity_type TEXT NOT NULL,
+  entity_id TEXT NOT NULL,
+  op TEXT NOT NULL,
+  payload_json TEXT,
+  updated_at TEXT NOT NULL,
+  updated_by_device_id TEXT NOT NULL,
+  created_at TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_devices_household ON devices(household_id);
+CREATE INDEX IF NOT EXISTS idx_entities_household_updated ON entities(household_id, updated_at);
+CREATE INDEX IF NOT EXISTS idx_changes_household_seq ON changes(household_id, seq);
+`);
+  return db;
+}
+
+function parseCorsOrigins(value) {
+  return String(value || '')
+    .split(',')
+    .map((item) => item.trim())
+    .filter(Boolean);
+}
+
+export async function createServer(options = {}) {
+  const port = Number.parseInt(String(options.port ?? process.env.PORT ?? '8787'), 10);
+  const requestedDbPath = String(options.dbPath ?? process.env.DB_PATH ?? '/data/sync.db');
+  const corsOrigins = Array.isArray(options.corsOrigins)
+    ? options.corsOrigins
+    : parseCorsOrigins(options.corsOrigins ?? process.env.CORS_ORIGINS ?? '');
+  const logger = options.logger === true;
+
+  const resolvedDbPath = resolveDbPath(requestedDbPath);
+  const db = initDb(resolvedDbPath);
+
+  const findHouseholdByCode = db.prepare(
+    'SELECT id FROM households WHERE sync_code_hash = ? LIMIT 1'
+  );
+  const insertHousehold = db.prepare(
+    'INSERT INTO households (id, sync_code_hash, created_at) VALUES (?, ?, ?)'
+  );
+  const insertDevice = db.prepare(
+    `INSERT INTO devices (id, household_id, device_name, token_hash, created_at, last_seen_at)
+     VALUES (?, ?, ?, ?, ?, ?)`
+  );
+  const findDeviceByToken = db.prepare(
+    `SELECT id, household_id, device_name
+     FROM devices
+     WHERE token_hash = ? AND household_id = ?
+     LIMIT 1`
+  );
+  const touchDevice = db.prepare('UPDATE devices SET last_seen_at = ? WHERE id = ?');
+  const readEntity = db.prepare(
+    `SELECT updated_at, updated_by_device_id
+     FROM entities
+     WHERE household_id = ? AND entity_type = ? AND entity_id = ?`
+  );
+  const upsertEntity = db.prepare(
+    `INSERT INTO entities (
+        household_id, entity_type, entity_id, payload_json, updated_at, deleted_at, updated_by_device_id
+     ) VALUES (?, ?, ?, ?, ?, ?, ?)
+     ON CONFLICT(household_id, entity_type, entity_id)
+     DO UPDATE SET
+        payload_json = excluded.payload_json,
+        updated_at = excluded.updated_at,
+        deleted_at = excluded.deleted_at,
+        updated_by_device_id = excluded.updated_by_device_id`
+  );
+  const appendChange = db.prepare(
+    `INSERT INTO changes (
+        household_id, entity_type, entity_id, op, payload_json, updated_at, updated_by_device_id, created_at
+     ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`
+  );
+  const readChangesSince = db.prepare(
+    `SELECT seq, entity_type, entity_id, op, payload_json, updated_at, updated_by_device_id
+     FROM changes
+     WHERE household_id = ? AND seq > ?
+     ORDER BY seq ASC
+     LIMIT ?`
+  );
+
+  const app = Fastify({
+    logger,
+    bodyLimit: 15 * 1024 * 1024,
+  });
+
+  app.decorateRequest('syncContext', null);
+
+  await app.register(cors, {
+    origin: (origin, cb) => {
+      if (!origin) {
+        cb(null, true);
+        return;
+      }
+      if (corsOrigins.length === 0) {
+        cb(null, true);
+        return;
+      }
+      cb(null, corsOrigins.includes(origin));
+    },
+  });
+
+  app.get('/health', async () => {
+    return {
+      ok: true,
+      time: nowIso(),
+      dbPath: resolvedDbPath,
+    };
+  });
+
+  app.post('/v1/pair', async (request, reply) => {
+    const body = request.body && typeof request.body === 'object' ? request.body : {};
+    const syncCode = typeof body.syncCode === 'string' ? body.syncCode.trim() : '';
+    const deviceName = typeof body.deviceName === 'string' ? body.deviceName.trim() : '';
+
+    if (syncCode.length < 4 || deviceName.length < 2) {
+      reply.code(400);
+      return { error: 'syncCode und deviceName sind erforderlich.' };
+    }
+
+    const syncCodeHash = hashValue(syncCode);
+    let household = findHouseholdByCode.get(syncCodeHash);
+    if (!household) {
+      household = { id: crypto.randomUUID() };
+      insertHousehold.run(household.id, syncCodeHash, nowIso());
+    }
+
+    const deviceId = crypto.randomUUID();
+    const token = randomToken();
+    const tokenHash = hashValue(token);
+    const now = nowIso();
+
+    insertDevice.run(deviceId, household.id, deviceName, tokenHash, now, now);
+
+    return {
+      householdId: household.id,
+      deviceId,
+      deviceToken: token,
+    };
+  });
+
+  app.addHook('preHandler', async (request, reply) => {
+    if (!request.url.startsWith('/v1/sync/')) {
+      return;
+    }
+
+    const authHeader = request.headers.authorization || '';
+    const householdId = String(request.headers['x-household-id'] || '').trim();
+
+    if (!authHeader.startsWith('Bearer ') || !householdId) {
+      reply.code(401);
+      throw new Error('Nicht autorisiert.');
+    }
+
+    const token = authHeader.slice('Bearer '.length).trim();
+    const tokenHash = hashValue(token);
+    const device = findDeviceByToken.get(tokenHash, householdId);
+
+    if (!device) {
+      reply.code(401);
+      throw new Error('Ungültiges Gerätetoken.');
+    }
+
+    touchDevice.run(nowIso(), device.id);
+    request.syncContext = {
+      deviceId: device.id,
+      householdId: device.household_id,
+    };
+  });
+
+  app.post('/v1/sync/push', async (request, reply) => {
+    const body = request.body && typeof request.body === 'object' ? request.body : {};
+    const incomingChanges = Array.isArray(body.changes) ? body.changes : [];
+    if (incomingChanges.length > 1000) {
+      reply.code(400);
+      return { error: 'Zu viele Änderungen in einem Request.' };
+    }
+
+    const { householdId, deviceId } = request.syncContext;
+    let applied = 0;
+
+    const applyTransaction = db.transaction((changes) => {
+      for (const rawChange of changes) {
+        if (!rawChange || typeof rawChange !== 'object') continue;
+        const entityType = String(rawChange.entityType || '');
+        const entityId = String(rawChange.entityId || '');
+        const op = String(rawChange.op || '');
+        const updatedAt = String(rawChange.updatedAt || '');
+
+        if (!ENTITY_TYPES.has(entityType)) continue;
+        if (!OPERATIONS.has(op)) continue;
+        if (!entityId || !updatedAt) continue;
+
+        const payload =
+          op === 'upsert' && rawChange.payload && typeof rawChange.payload === 'object'
+            ? JSON.stringify(rawChange.payload)
+            : null;
+
+        const current = readEntity.get(householdId, entityType, entityId);
+        if (!shouldApplyChange(current, updatedAt, deviceId)) {
+          continue;
+        }
+
+        const deletedAt = op === 'delete' ? updatedAt : null;
+        upsertEntity.run(
+          householdId,
+          entityType,
+          entityId,
+          payload,
+          updatedAt,
+          deletedAt,
+          deviceId
+        );
+        appendChange.run(
+          householdId,
+          entityType,
+          entityId,
+          op,
+          payload,
+          updatedAt,
+          deviceId,
+          nowIso()
+        );
+        applied += 1;
+      }
+    });
+
+    applyTransaction(incomingChanges);
+
+    return {
+      received: incomingChanges.length,
+      applied,
+    };
+  });
+
+  app.get('/v1/sync/pull', async (request) => {
+    const query = request.query && typeof request.query === 'object' ? request.query : {};
+    const rawCursor = Number.parseInt(String(query.cursor || '0'), 10);
+    const cursor = Number.isFinite(rawCursor) && rawCursor >= 0 ? rawCursor : 0;
+    const { householdId } = request.syncContext;
+
+    const rows = readChangesSince.all(householdId, cursor, 1000);
+    let nextCursor = cursor;
+
+    const changes = rows.map((row) => {
+      nextCursor = Math.max(nextCursor, row.seq);
+      return {
+        seq: row.seq,
+        entityType: row.entity_type,
+        entityId: row.entity_id,
+        op: row.op,
+        updatedAt: row.updated_at,
+        updatedByDeviceId: row.updated_by_device_id,
+        payload: row.payload_json ? JSON.parse(row.payload_json) : null,
+      };
+    });
+
+    return {
+      cursor: nextCursor,
+      changes,
+    };
+  });
+
+  app.setErrorHandler((error, _request, reply) => {
+    if (!reply.sent) {
+      reply.code(reply.statusCode >= 400 ? reply.statusCode : 500).send({
+        error: error.message || 'Serverfehler',
+      });
+    }
+  });
+
+  app.addHook('onClose', async () => {
+    db.close();
+  });
+
+  return {
+    app,
+    port,
+    resolvedDbPath,
+  };
+}
+
+const isMainModule =
+  typeof process.argv[1] === 'string' &&
+  import.meta.url === pathToFileURL(process.argv[1]).href;
+
+if (isMainModule) {
+  const { app, port } = await createServer({
+    port: process.env.PORT,
+    dbPath: process.env.DB_PATH,
+    corsOrigins: process.env.CORS_ORIGINS,
+    logger: true,
+  });
+  app.listen({ port, host: '0.0.0.0' }).catch((err) => {
+    app.log.error(err);
+    process.exit(1);
+  });
+}
diff --git a/sync-backend/src/server.test.js b/sync-backend/src/server.test.js
new file mode 100644
index 0000000..52395f1
--- /dev/null
+++ b/sync-backend/src/server.test.js
@@ -0,0 +1,258 @@
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { afterEach, describe, expect, it } from 'vitest';
+import { createServer, shouldApplyChange } from './server.js';
+
+async function setupServer() {
+  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'preptrack-sync-test-'));
+  const dbPath = path.join(tempDir, 'sync.db');
+  const { app } = await createServer({
+    dbPath,
+    logger: false,
+  });
+  return { app, tempDir };
+}
+
+async function pairDevice(app, syncCode, deviceName) {
+  const res = await app.inject({
+    method: 'POST',
+    url: '/v1/pair',
+    payload: { syncCode, deviceName },
+  });
+  expect(res.statusCode).toBe(200);
+  return res.json();
+}
+
+function authHeaders(deviceToken, householdId) {
+  return {
+    authorization: `Bearer ${deviceToken}`,
+    'x-household-id': householdId,
+  };
+}
+
+const openServers = [];
+
+afterEach(async () => {
+  while (openServers.length > 0) {
+    const { app, tempDir } = openServers.pop();
+    await app.close();
+    fs.rmSync(tempDir, { recursive: true, force: true });
+  }
+});
+
+describe('shouldApplyChange', () => {
+  it('accepts newer updates and rejects older ones', () => {
+    const current = {
+      updated_at: '2026-03-10T10:00:00.000Z',
+      updated_by_device_id: 'device-a',
+    };
+
+    expect(shouldApplyChange(current, '2026-03-10T10:00:01.000Z', 'device-b')).toBe(true);
+    expect(shouldApplyChange(current, '2026-03-10T09:59:59.000Z', 'device-b')).toBe(false);
+  });
+
+  it('uses device id as deterministic tie-breaker', () => {
+    const current = {
+      updated_at: '2026-03-10T10:00:00.000Z',
+      updated_by_device_id: 'device-b',
+    };
+
+    expect(shouldApplyChange(current, '2026-03-10T10:00:00.000Z', 'device-a')).toBe(false);
+    expect(shouldApplyChange(current, '2026-03-10T10:00:00.000Z', 'device-c')).toBe(true);
+  });
+});
+
+describe('sync backend integration', () => {
+  it('pairs multiple devices into the same household for the same sync code', async () => {
+    const ctx = await setupServer();
+    openServers.push(ctx);
+
+    const first = await pairDevice(ctx.app, 'HOUSEHOLD-1234', 'Desktop');
+    const second = await pairDevice(ctx.app, 'HOUSEHOLD-1234', 'Phone');
+
+    expect(first.householdId).toBe(second.householdId);
+    expect(first.deviceId).not.toBe(second.deviceId);
+    expect(first.deviceToken).not.toBe(second.deviceToken);
+  });
+
+  it('requires authentication for sync endpoints', async () => {
+    const ctx = await setupServer();
+    openServers.push(ctx);
+
+    const res = await ctx.app.inject({
+      method: 'GET',
+      url: '/v1/sync/pull?cursor=0',
+    });
+    expect(res.statusCode).toBe(401);
+  });
+
+  it('supports push and pull with last-write-wins behavior', async () => {
+    const ctx = await setupServer();
+    openServers.push(ctx);
+
+    const desktop = await pairDevice(ctx.app, 'SYNC-CODE-1', 'Desktop');
+    const phone = await pairDevice(ctx.app, 'SYNC-CODE-1', 'Phone');
+
+    const firstPush = await ctx.app.inject({
+      method: 'POST',
+      url: '/v1/sync/push',
+      headers: authHeaders(desktop.deviceToken, desktop.householdId),
+      payload: {
+        changes: [
+          {
+            entityType: 'product',
+            entityId: 'prod-1',
+            op: 'upsert',
+            updatedAt: '2026-03-10T12:00:00.000Z',
+            payload: { syncId: 'prod-1', name: 'Reis', quantity: 1 },
+          },
+        ],
+      },
+    });
+    expect(firstPush.statusCode).toBe(200);
+    expect(firstPush.json().applied).toBe(1);
+
+    const initialPull = await ctx.app.inject({
+      method: 'GET',
+      url: '/v1/sync/pull?cursor=0',
+      headers: authHeaders(phone.deviceToken, phone.householdId),
+    });
+    expect(initialPull.statusCode).toBe(200);
+    const initialPayload = initialPull.json();
+    expect(initialPayload.changes).toHaveLength(1);
+    expect(initialPayload.changes[0].payload.quantity).toBe(1);
+
+    const staleUpdate = await ctx.app.inject({
+      method: 'POST',
+      url: '/v1/sync/push',
+      headers: authHeaders(phone.deviceToken, phone.householdId),
+      payload: {
+        changes: [
+          {
+            entityType: 'product',
+            entityId: 'prod-1',
+            op: 'upsert',
+            updatedAt: '2026-03-10T11:59:59.000Z',
+            payload: { syncId: 'prod-1', name: 'Reis', quantity: 99 },
+          },
+        ],
+      },
+    });
+    expect(staleUpdate.statusCode).toBe(200);
+    expect(staleUpdate.json().applied).toBe(0);
+
+    const newerUpdate = await ctx.app.inject({
+      method: 'POST',
+      url: '/v1/sync/push',
+      headers: authHeaders(phone.deviceToken, phone.householdId),
+      payload: {
+        changes: [
+          {
+            entityType: 'product',
+            entityId: 'prod-1',
+            op: 'upsert',
+            updatedAt: '2026-03-10T12:05:00.000Z',
+            payload: { syncId: 'prod-1', name: 'Reis', quantity: 2 },
+          },
+        ],
+      },
+    });
+    expect(newerUpdate.statusCode).toBe(200);
+    expect(newerUpdate.json().applied).toBe(1);
+
+    const secondPull = await ctx.app.inject({
+      method: 'GET',
+      url: `/v1/sync/pull?cursor=${initialPayload.cursor}`,
+      headers: authHeaders(desktop.deviceToken, desktop.householdId),
+    });
+    expect(secondPull.statusCode).toBe(200);
+    const secondPayload = secondPull.json();
+    expect(secondPayload.changes).toHaveLength(1);
+    expect(secondPayload.changes[0].payload.quantity).toBe(2);
+  });
+
+  it('propagates deletes as tombstone changes', async () => {
+    const ctx = await setupServer();
+    openServers.push(ctx);
+
+    const deviceA = await pairDevice(ctx.app, 'SYNC-CODE-DELETE', 'Desktop');
+    const deviceB = await pairDevice(ctx.app, 'SYNC-CODE-DELETE', 'Phone');
+
+    await ctx.app.inject({
+      method: 'POST',
+      url: '/v1/sync/push',
+      headers: authHeaders(deviceA.deviceToken, deviceA.householdId),
+      payload: {
+        changes: [
+          {
+            entityType: 'product',
+            entityId: 'prod-delete',
+            op: 'upsert',
+            updatedAt: '2026-03-10T10:00:00.000Z',
+            payload: { syncId: 'prod-delete', name: 'Wasser', quantity: 4 },
+          },
+        ],
+      },
+    });
+
+    const firstPull = await ctx.app.inject({
+      method: 'GET',
+      url: '/v1/sync/pull?cursor=0',
+      headers: authHeaders(deviceB.deviceToken, deviceB.householdId),
+    });
+    const firstCursor = firstPull.json().cursor;
+
+    const deletePush = await ctx.app.inject({
+      method: 'POST',
+      url: '/v1/sync/push',
+      headers: authHeaders(deviceA.deviceToken, deviceA.householdId),
+      payload: {
+        changes: [
+          {
+            entityType: 'product',
+            entityId: 'prod-delete',
+            op: 'delete',
+            updatedAt: '2026-03-10T11:00:00.000Z',
+          },
+        ],
+      },
+    });
+    expect(deletePush.statusCode).toBe(200);
+    expect(deletePush.json().applied).toBe(1);
+
+    const afterDeletePull = await ctx.app.inject({
+      method: 'GET',
+      url: `/v1/sync/pull?cursor=${firstCursor}`,
+      headers: authHeaders(deviceB.deviceToken, deviceB.householdId),
+    });
+    expect(afterDeletePull.statusCode).toBe(200);
+    const payload = afterDeletePull.json();
+    expect(payload.changes).toHaveLength(1);
+    expect(payload.changes[0].op).toBe('delete');
+    expect(payload.changes[0].payload).toBeNull();
+  });
+
+  it('rejects oversized push batches', async () => {
+    const ctx = await setupServer();
+    openServers.push(ctx);
+
+    const paired = await pairDevice(ctx.app, 'SYNC-CODE-LIMIT', 'Desktop');
+    const changes = Array.from({ length: 1001 }, (_, i) => ({
+      entityType: 'product',
+      entityId: `prod-${i}`,
+      op: 'upsert',
+      updatedAt: '2026-03-10T12:00:00.000Z',
+      payload: { syncId: `prod-${i}`, name: `Item ${i}`, quantity: 1 },
+    }));
+
+    const res = await ctx.app.inject({
+      method: 'POST',
+      url: '/v1/sync/push',
+      headers: authHeaders(paired.deviceToken, paired.householdId),
+      payload: { changes },
+    });
+
+    expect(res.statusCode).toBe(400);
+  });
+});