created simple auth system using betterauth

.gitignore

@@ -38,3 +38,5 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+*.db

better-auth_migrations/2026-02-27T12-45-33.464Z.sql

@@ -0,0 +1,13 @@
+create table "user" ("id" text not null primary key, "name" text not null, "email" text not null unique, "emailVerified" integer not null, "image" text, "createdAt" date not null, "updatedAt" date not null);
+
+create table "session" ("id" text not null primary key, "expiresAt" date not null, "token" text not null unique, "createdAt" date not null, "updatedAt" date not null, "ipAddress" text, "userAgent" text, "userId" text not null references "user" ("id") on delete cascade);
+
+create table "account" ("id" text not null primary key, "accountId" text not null, "providerId" text not null, "userId" text not null references "user" ("id") on delete cascade, "accessToken" text, "refreshToken" text, "idToken" text, "accessTokenExpiresAt" date, "refreshTokenExpiresAt" date, "scope" text, "password" text, "createdAt" date not null, "updatedAt" date not null);
+
+create table "verification" ("id" text not null primary key, "identifier" text not null, "value" text not null, "expiresAt" date not null, "createdAt" date not null, "updatedAt" date not null);
+
+create index "session_userId_idx" on "session" ("userId");
+
+create index "account_userId_idx" on "account" ("userId");
+
+create index "verification_identifier_idx" on "verification" ("identifier");

package-lock.json

@@ -9,11 +9,15 @@
       "version": "0.1.0",
       "dependencies": {
         "@tailwindcss/postcss": "^4.2.1",
+        "better-auth": "^1.4.19",
+        "better-auth-localization": "^2.3.1",
+        "better-sqlite3": "^12.6.2",
         "next": "16.1.6",
         "postcss": "^8.5.6",
         "tailwindcss": "^4.2.1"
       },
       "devDependencies": {
+        "@types/better-sqlite3": "^7.6.13",
         "@types/node": "^20",
         "@types/react": "^19",
         "typescript": "^5"
@@ -31,6 +35,46 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@better-auth/core": {
+      "version": "1.4.19",
+      "resolved": "https://registry.npmjs.org/@better-auth/core/-/core-1.4.19.tgz",
+      "integrity": "sha512-uADLHG1jc5BnEJi7f6ijUN5DmPPRSj++7m/G19z3UqA3MVCo4Y4t1MMa4IIxLCqGDFv22drdfxescgW+HnIowA==",
+      "dependencies": {
+        "@standard-schema/spec": "^1.0.0",
+        "zod": "^4.3.5"
+      },
+      "peerDependencies": {
+        "@better-auth/utils": "0.3.0",
+        "@better-fetch/fetch": "1.1.21",
+        "better-call": "1.1.8",
+        "jose": "^6.1.0",
+        "kysely": "^0.28.5",
+        "nanostores": "^1.0.1"
+      }
+    },
+    "node_modules/@better-auth/telemetry": {
+      "version": "1.4.19",
+      "resolved": "https://registry.npmjs.org/@better-auth/telemetry/-/telemetry-1.4.19.tgz",
+      "integrity": "sha512-ApGNS7olCTtDpKF8Ow3Z+jvFAirOj7c4RyFUpu8axklh3mH57ndpfUAUjhgA8UVoaaH/mnm/Tl884BlqiewLyw==",
+      "dependencies": {
+        "@better-auth/utils": "0.3.0",
+        "@better-fetch/fetch": "1.1.21"
+      },
+      "peerDependencies": {
+        "@better-auth/core": "1.4.19"
+      }
+    },
+    "node_modules/@better-auth/utils": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@better-auth/utils/-/utils-0.3.0.tgz",
+      "integrity": "sha512-W+Adw6ZA6mgvnSnhOki270rwJ42t4XzSK6YWGF//BbVXL6SwCLWfyzBc1lN2m/4RM28KubdBKQ4X5VMoLRNPQw==",
+      "license": "MIT"
+    },
+    "node_modules/@better-fetch/fetch": {
+      "version": "1.1.21",
+      "resolved": "https://registry.npmjs.org/@better-fetch/fetch/-/fetch-1.1.21.tgz",
+      "integrity": "sha512-/ImESw0sskqlVR94jB+5+Pxjf+xBwDZF/N5+y2/q4EqD7IARUTSpPfIo8uf39SYpCxyOCtbyYpUrZ3F/k0zT4A=="
+    },
     "node_modules/@emnapi/runtime": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.8.1.tgz",
@@ -686,6 +730,36 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@noble/ciphers": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/@noble/ciphers/-/ciphers-2.1.1.tgz",
+      "integrity": "sha512-bysYuiVfhxNJuldNXlFEitTVdNnYUc+XNJZd7Qm2a5j1vZHgY+fazadNFWFaMK/2vye0JVlxV3gHmC0WDfAOQw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 20.19.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@noble/hashes": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-2.0.1.tgz",
+      "integrity": "sha512-XlOlEbQcE9fmuXxrVTXCTlG2nlRXa9Rj3rr5Ue/+tX+nmkgbX720YHh0VR3hBF9xDvwnb8D2shVGOwNx+ulArw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 20.19.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@standard-schema/spec": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.1.0.tgz",
+      "integrity": "sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w==",
+      "license": "MIT"
+    },
     "node_modules/@swc/helpers": {
       "version": "0.5.15",
       "resolved": "https://registry.npmjs.org/@swc/helpers/-/helpers-0.5.15.tgz",
@@ -951,6 +1025,16 @@
         "tailwindcss": "4.2.1"
       }
     },
+    "node_modules/@types/better-sqlite3": {
+      "version": "7.6.13",
+      "resolved": "https://registry.npmjs.org/@types/better-sqlite3/-/better-sqlite3-7.6.13.tgz",
+      "integrity": "sha512-NMv9ASNARoKksWtsq/SHakpYAYnhBrQgGD8zkLYk/jaK8jUGn08CfEdTRgYhMypUQAfzSP8W6gNLe0q19/t4VA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/node": {
       "version": "20.19.35",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-20.19.35.tgz",
@@ -971,6 +1055,26 @@
         "csstype": "^3.2.2"
       }
     },
+    "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==",
+      "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",
@@ -983,6 +1087,193 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/better-auth": {
+      "version": "1.4.19",
+      "resolved": "https://registry.npmjs.org/better-auth/-/better-auth-1.4.19.tgz",
+      "integrity": "sha512-3RlZJcA0+NH25wYD85vpIGwW9oSTuEmLIaGbT8zg41w/Pa2hVWHKedjoUHHJtnzkBXzDb+CShkLnSw7IThDdqQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@better-auth/core": "1.4.19",
+        "@better-auth/telemetry": "1.4.19",
+        "@better-auth/utils": "0.3.0",
+        "@better-fetch/fetch": "1.1.21",
+        "@noble/ciphers": "^2.0.0",
+        "@noble/hashes": "^2.0.0",
+        "better-call": "1.1.8",
+        "defu": "^6.1.4",
+        "jose": "^6.1.0",
+        "kysely": "^0.28.5",
+        "nanostores": "^1.0.1",
+        "zod": "^4.3.5"
+      },
+      "peerDependencies": {
+        "@lynx-js/react": "*",
+        "@prisma/client": "^5.0.0 || ^6.0.0 || ^7.0.0",
+        "@sveltejs/kit": "^2.0.0",
+        "@tanstack/react-start": "^1.0.0",
+        "@tanstack/solid-start": "^1.0.0",
+        "better-sqlite3": "^12.0.0",
+        "drizzle-kit": ">=0.31.4",
+        "drizzle-orm": ">=0.41.0",
+        "mongodb": "^6.0.0 || ^7.0.0",
+        "mysql2": "^3.0.0",
+        "next": "^14.0.0 || ^15.0.0 || ^16.0.0",
+        "pg": "^8.0.0",
+        "prisma": "^5.0.0 || ^6.0.0 || ^7.0.0",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0",
+        "solid-js": "^1.0.0",
+        "svelte": "^4.0.0 || ^5.0.0",
+        "vitest": "^2.0.0 || ^3.0.0 || ^4.0.0",
+        "vue": "^3.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@lynx-js/react": {
+          "optional": true
+        },
+        "@prisma/client": {
+          "optional": true
+        },
+        "@sveltejs/kit": {
+          "optional": true
+        },
+        "@tanstack/react-start": {
+          "optional": true
+        },
+        "@tanstack/solid-start": {
+          "optional": true
+        },
+        "better-sqlite3": {
+          "optional": true
+        },
+        "drizzle-kit": {
+          "optional": true
+        },
+        "drizzle-orm": {
+          "optional": true
+        },
+        "mongodb": {
+          "optional": true
+        },
+        "mysql2": {
+          "optional": true
+        },
+        "next": {
+          "optional": true
+        },
+        "pg": {
+          "optional": true
+        },
+        "prisma": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        },
+        "solid-js": {
+          "optional": true
+        },
+        "svelte": {
+          "optional": true
+        },
+        "vitest": {
+          "optional": true
+        },
+        "vue": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/better-auth-localization": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/better-auth-localization/-/better-auth-localization-2.3.1.tgz",
+      "integrity": "sha512-3XBH+yffIt7NtBNeKA9gbxe0lOrwyBaGIYHFX0Pvb4CZZlnnzIFuvRcofF0hrJQH1tRN8FxG9BrWhSDb2VTfzg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "better-auth": "^1.4.19"
+      }
+    },
+    "node_modules/better-call": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/better-call/-/better-call-1.1.8.tgz",
+      "integrity": "sha512-XMQ2rs6FNXasGNfMjzbyroSwKwYbZ/T3IxruSS6U2MJRsSYh3wYtG3o6H00ZlKZ/C/UPOAD97tqgQJNsxyeTXw==",
+      "license": "MIT",
+      "dependencies": {
+        "@better-auth/utils": "^0.3.0",
+        "@better-fetch/fetch": "^1.1.4",
+        "rou3": "^0.7.10",
+        "set-cookie-parser": "^2.7.1"
+      },
+      "peerDependencies": {
+        "zod": "^4.0.0"
+      },
+      "peerDependenciesMeta": {
+        "zod": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/better-sqlite3": {
+      "version": "12.6.2",
+      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.6.2.tgz",
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+      "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/bindings": {
+      "version": "1.5.0",
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+      "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",
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+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
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+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
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+      "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/caniuse-lite": {
       "version": "1.0.30001774",
       "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001774.tgz",
@@ -1003,6 +1294,12 @@
       ],
       "license": "CC-BY-4.0"
     },
+    "node_modules/chownr": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
+      "license": "ISC"
+    },
     "node_modules/client-only": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/client-only/-/client-only-0.0.1.tgz",
@@ -1016,6 +1313,36 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/decompress-response": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-6.0.0.tgz",
+      "integrity": "sha512-aW35yZM6Bb/4oJlZncMH2LCoZtJXTRxES17vE3hoRiowU2kWHaJKFkSBDnDR+cm9J+9QhXmREyIfv0pji9ejCQ==",
+      "license": "MIT",
+      "dependencies": {
+        "mimic-response": "^3.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/deep-extend": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/defu": {
+      "version": "6.1.4",
+      "resolved": "https://registry.npmjs.org/defu/-/defu-6.1.4.tgz",
+      "integrity": "sha512-mEQCMmwJu317oSz8CwdIOdwf3xMif1ttiM8LTufzc3g6kR+9Pe236twL8j3IYT1F7GfRgGcW6MWxzZjLIkuHIg==",
+      "license": "MIT"
+    },
     "node_modules/detect-libc": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",
@@ -1025,6 +1352,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/end-of-stream": {
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.5.tgz",
+      "integrity": "sha512-ooEGc6HP26xXq/N+GCGOT0JKCLDGrq2bQUZrQ7gyrJiZANJ/8YDTxTpQBXGMn+WbIQXNVpyWymm7KYVICQnyOg==",
+      "license": "MIT",
+      "dependencies": {
+        "once": "^1.4.0"
+      }
+    },
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@@ -1038,12 +1374,71 @@
         "node": ">=10.13.0"
       }
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+    "node_modules/expand-template": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/expand-template/-/expand-template-2.0.3.tgz",
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+      "license": "(MIT OR WTFPL)",
+      "engines": {
+        "node": ">=6"
+      }
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+    },
+    "node_modules/github-from-package": {
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+      "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": "BSD-3-Clause"
+    },
+    "node_modules/inherits": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+      "license": "ISC"
+    },
+    "node_modules/ini": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
+      "integrity": "sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew==",
+      "license": "ISC"
+    },
     "node_modules/jiti": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.6.1.tgz",
@@ -1053,6 +1448,24 @@
         "jiti": "lib/jiti-cli.mjs"
       }
     },
+    "node_modules/jose": {
+      "version": "6.1.3",
+      "resolved": "https://registry.npmjs.org/jose/-/jose-6.1.3.tgz",
+      "integrity": "sha512-0TpaTfihd4QMNwrz/ob2Bp7X04yuxJkjRGi4aKmOqwhov54i6u79oCv7T+C7lo70MKH6BesI3vscD1yb/yzKXQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/panva"
+      }
+    },
+    "node_modules/kysely": {
+      "version": "0.28.11",
+      "resolved": "https://registry.npmjs.org/kysely/-/kysely-0.28.11.tgz",
+      "integrity": "sha512-zpGIFg0HuoC893rIjYX1BETkVWdDnzTzF5e0kWXJFg5lE0k1/LfNWBejrcnOFu8Q2Rfq/hTDTU7XLUM8QOrpzg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.0.0"
+      }
+    },
     "node_modules/lightningcss": {
       "version": "1.31.1",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.31.1.tgz",
@@ -1311,6 +1724,33 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/mimic-response": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/mimic-response/-/mimic-response-3.1.0.tgz",
+      "integrity": "sha512-z0yWI+4FDrrweS8Zmt4Ej5HdJmky15+L2e6Wgn3+iK5fWzb6T3fhNFq2+MeTRb064c6Wr4N/wv0DzQTjNzHNGQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/minimist": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/mkdirp-classic": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/mkdirp-classic/-/mkdirp-classic-0.5.3.tgz",
+      "integrity": "sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A==",
+      "license": "MIT"
+    },
     "node_modules/nanoid": {
       "version": "3.3.11",
       "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",
@@ -1329,6 +1769,27 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/nanostores": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/nanostores/-/nanostores-1.1.1.tgz",
+      "integrity": "sha512-EYJqS25r2iBeTtGQCHidXl1VfZ1jXM7Q04zXJOrMlxVVmD0ptxJaNux92n1mJ7c5lN3zTq12MhH/8x59nP+qmg==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": "^20.0.0 || >=22.0.0"
+      }
+    },
+    "node_modules/napi-build-utils": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-2.0.0.tgz",
+      "integrity": "sha512-GEbrYkbfF7MoNaoh2iGG84Mnf/WZfB0GdGEsM8wz7Expx/LlWf5U8t9nvJKXSp3qr5IsEbK04cBGhol/KwOsWA==",
+      "license": "MIT"
+    },
     "node_modules/next": {
       "version": "16.1.6",
       "resolved": "https://registry.npmjs.org/next/-/next-16.1.6.tgz",
@@ -1410,6 +1871,27 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/node-abi": {
+      "version": "3.87.0",
+      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-3.87.0.tgz",
+      "integrity": "sha512-+CGM1L1CgmtheLcBuleyYOn7NWPVu0s0EJH2C4puxgEZb9h8QpR9G2dBfZJOAUhi7VQxuBPMd0hiISWcTyiYyQ==",
+      "license": "MIT",
+      "dependencies": {
+        "semver": "^7.3.5"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==",
+      "license": "ISC",
+      "dependencies": {
+        "wrappy": "1"
+      }
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
@@ -1444,6 +1926,58 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/prebuild-install": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-7.1.3.tgz",
+      "integrity": "sha512-8Mf2cbV7x1cXPUILADGI3wuhfqWvtiLA1iclTDbFRZkgRQS0NqsPZphna9V+HyTEadheuPmjaJMsbzKQFOzLug==",
+      "deprecated": "No longer maintained. Please contact the author of the relevant native addon; alternatives are available.",
+      "license": "MIT",
+      "dependencies": {
+        "detect-libc": "^2.0.0",
+        "expand-template": "^2.0.3",
+        "github-from-package": "0.0.0",
+        "minimist": "^1.2.3",
+        "mkdirp-classic": "^0.5.3",
+        "napi-build-utils": "^2.0.0",
+        "node-abi": "^3.3.0",
+        "pump": "^3.0.0",
+        "rc": "^1.2.7",
+        "simple-get": "^4.0.0",
+        "tar-fs": "^2.0.0",
+        "tunnel-agent": "^0.6.0"
+      },
+      "bin": {
+        "prebuild-install": "bin.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/pump": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.3.tgz",
+      "integrity": "sha512-todwxLMY7/heScKmntwQG8CXVkWUOdYxIvY2s0VWAAMh/nd8SoYiRaKjlr7+iCs984f2P8zvrfWcDDYVb73NfA==",
+      "license": "MIT",
+      "dependencies": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
+    },
+    "node_modules/rc": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+      "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
+      "license": "(BSD-2-Clause OR MIT OR Apache-2.0)",
+      "dependencies": {
+        "deep-extend": "^0.6.0",
+        "ini": "~1.3.0",
+        "minimist": "^1.2.0",
+        "strip-json-comments": "~2.0.1"
+      },
+      "bin": {
+        "rc": "cli.js"
+      }
+    },
     "node_modules/react": {
       "version": "19.2.4",
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.4.tgz",
@@ -1467,6 +2001,46 @@
         "react": "^19.2.4"
       }
     },
+    "node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/rou3": {
+      "version": "0.7.12",
+      "resolved": "https://registry.npmjs.org/rou3/-/rou3-0.7.12.tgz",
+      "integrity": "sha512-iFE4hLDuloSWcD7mjdCDhx2bKcIsYbtOTpfH5MHHLSKMOUyjqQXTeZVa289uuwEGEKFoE/BAPbhaU4B774nceg==",
+      "license": "MIT"
+    },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "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/scheduler": {
       "version": "0.27.0",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.27.0.tgz",
@@ -1479,7 +2053,6 @@
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
       "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
       "license": "ISC",
-      "optional": true,
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -1487,6 +2060,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/set-cookie-parser": {
+      "version": "2.7.2",
+      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.7.2.tgz",
+      "integrity": "sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==",
+      "license": "MIT"
+    },
     "node_modules/sharp": {
       "version": "0.34.5",
       "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.34.5.tgz",
@@ -1532,6 +2111,51 @@
         "@img/sharp-win32-x64": "0.34.5"
       }
     },
+    "node_modules/simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "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/simple-get": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-4.0.1.tgz",
+      "integrity": "sha512-brv7p5WgH0jmQJr1ZDDfKDOSeWWg+OVypG99A/5vYGPqJ6pxiaHLy8nxtFjBA7oMa01ebA9gfh1uMCFqOuXxvA==",
+      "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": {
+        "decompress-response": "^6.0.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -1541,6 +2165,24 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "node_modules/strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/styled-jsx": {
       "version": "5.1.6",
       "resolved": "https://registry.npmjs.org/styled-jsx/-/styled-jsx-5.1.6.tgz",
@@ -1583,12 +2225,52 @@
         "url": "https://opencollective.com/webpack"
       }
     },
+    "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==",
+      "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==",
+      "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/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
       "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==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -1609,6 +2291,27 @@
       "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
       "dev": true,
       "license": "MIT"
+    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
+    "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==",
+      "license": "ISC"
+    },
+    "node_modules/zod": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
+      "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }

package.json

@@ -9,11 +9,15 @@
   },
   "dependencies": {
     "@tailwindcss/postcss": "^4.2.1",
+    "better-auth": "^1.4.19",
+    "better-auth-localization": "^2.3.1",
+    "better-sqlite3": "^12.6.2",
     "next": "16.1.6",
     "postcss": "^8.5.6",
     "tailwindcss": "^4.2.1"
   },
   "devDependencies": {
+    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^20",
     "@types/react": "^19",
     "typescript": "^5"

src/app/admin/page.tsx

@@ -0,0 +1,12 @@
+import AuthRedirect from "@/components/AuthRedirect";
+
+export default function AdminPage() {
+
+  return (
+    <div>
+        <AuthRedirect />
+        <h1>Admin Dashboard</h1>
+        <p>Welcome to the admin dashboard. Here you can manage the application.</p>
+    </div>
+  );
+}

src/app/api/auth/[...all]/route.ts

@@ -0,0 +1,3 @@
+import { auth } from "@/lib/auth"; // path to your auth file
+import { toNextJsHandler } from "better-auth/next-js";
+export const { POST, GET } = toNextJsHandler(auth);

src/app/layout.tsx

@@ -1,3 +1,7 @@
+import './globals.css';
+import { Header } from '@/components/Header';
+import { Footer } from '@/components/Footer';
+
 export default function RootLayout({
   children,
 }: {
@@ -5,7 +9,13 @@ export default function RootLayout({
 }) {
   return (
     <html>
-      <body>{children}</body>
+      <body className="flex flex-col min-h-screen">
+        <Header />
+        <main className="flex-grow mt-4 mb-4 mr-8 ml-8">
+          {children}
+        </main>
+        <Footer />
+      </body>
     </html>
   )
 }

src/app/page.tsx

@@ -1,3 +1,5 @@
+"use client";
+
 export default function Page() {
   return <h1>Hello Next.js!</h1>
 }

src/app/user/sign-in/page.tsx

@@ -0,0 +1,5 @@
+import { AuthForm } from '@/components/AuthForm';
+
+export default function SignInPage() {
+  return <AuthForm />;
+}

src/components/AuthForm.tsx

@@ -0,0 +1,235 @@
+'use client';
+
+import { useState } from 'react';
+import { authClient } from '@/lib/auth-client';
+
+type AuthMode = 'signin' | 'signup';
+
+export function AuthForm() {
+  const [mode, setMode] = useState<AuthMode>('signin');
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+  const [confirmPassword, setConfirmPassword] = useState('');
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState('');
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError('');
+    setLoading(true);
+
+    try {
+      if (mode === 'signin') {
+        const response = await authClient.signIn.email({
+          email,
+          password,
+        });
+        if (response.error) {
+          setError(response.error.message || 'Authentifizierung fehlgeschlagen');
+        }
+      } else {
+        if (password !== confirmPassword) {
+          setError('Die Passwörter stimmen nicht überein');
+          setLoading(false);
+          return;
+        }
+        const response = await authClient.signUp.email({
+          email,
+          name: email.split('@')[0],
+          password,
+        });
+        if (response.error) {
+          setError(response.error.message || 'Registrierung fehlgeschlagen');
+        }
+      }
+    } catch (err: any) {
+      setError(err.message || 'Ein Fehler ist aufgetreten');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="flex items-center justify-center py-12">
+      <div className="w-full max-w-md">
+        {/* Card */}
+        <div className="bg-white rounded-lg shadow-lg overflow-hidden border border-gray-200">
+          {/* Header */}
+          <div className="bg-gradient-to-r from-blue-600 to-blue-700 px-6 py-8">
+            <h1 className="text-3xl font-bold text-white text-center">
+              Dialektannotation
+            </h1>
+            <p className="text-blue-100 text-center mt-2">
+              TTS-Plattform
+            </p>
+          </div>
+
+          {/* Tabs */}
+          <div className="flex border-b border-gray-200">
+            <button
+              onClick={() => {
+                setMode('signin');
+                setError('');
+              }}
+              className={`flex-1 py-4 px-6 font-semibold text-center transition-colors ${
+                mode === 'signin'
+                  ? 'bg-blue-50 text-blue-600 border-b-2 border-blue-600'
+                  : 'text-gray-600 hover:text-gray-700'
+              }`}
+            >
+              Anmelden
+            </button>
+            <button
+              onClick={() => {
+                setMode('signup');
+                setError('');
+              }}
+              className={`flex-1 py-4 px-6 font-semibold text-center transition-colors ${
+                mode === 'signup'
+                  ? 'bg-blue-50 text-blue-600 border-b-2 border-blue-600'
+                  : 'text-gray-600 hover:text-gray-700'
+              }`}
+            >
+              Registrieren
+            </button>
+          </div>
+
+          {/* Form */}
+          <form onSubmit={handleSubmit} className="p-6 space-y-4">
+            {/* Error Message */}
+            {error && (
+              <div className="bg-red-50 border border-red-300 text-red-700 px-4 py-3 rounded-lg flex items-start gap-3">
+                <svg
+                  className="w-5 h-5 mt-0.5 flex-shrink-0"
+                  fill="currentColor"
+                  viewBox="0 0 20 20"
+                >
+                  <path
+                    fillRule="evenodd"
+                    d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z"
+                    clipRule="evenodd"
+                  />
+                </svg>
+                <span className="text-sm">{error}</span>
+              </div>
+            )}
+
+            {/* Email Input */}
+            <div>
+              <label htmlFor="email" className="block text-sm font-medium text-gray-700 mb-2">
+                E-Mail-Adresse
+              </label>
+              <input
+                id="email"
+                type="email"
+                value={email}
+                onChange={(e) => setEmail(e.target.value)}
+                placeholder="you@example.com"
+                required
+                className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors"
+              />
+            </div>
+
+            {/* Password Input */}
+            <div>
+              <label htmlFor="password" className="block text-sm font-medium text-gray-700 mb-2">
+                Passwort
+              </label>
+              <input
+                id="password"
+                type="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                placeholder="••••••••"
+                required
+                minLength={8}
+                className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors"
+              />
+              {mode === 'signup' && (
+                <p className="text-xs text-gray-500 mt-1">
+                  Mindestens 8 Zeichen
+                </p>
+              )}
+            </div>
+
+            {/* Confirm Password Input (Sign Up Only) */}
+            {mode === 'signup' && (
+              <div>
+                <label htmlFor="confirmPassword" className="block text-sm font-medium text-gray-700 mb-2">
+                  Passwort bestätigen
+                </label>
+                <input
+                  id="confirmPassword"
+                  type="password"
+                  value={confirmPassword}
+                  onChange={(e) => setConfirmPassword(e.target.value)}
+                  placeholder="••••••••"
+                  required
+                  minLength={8}
+                  className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-colors"
+                />
+              </div>
+            )}
+
+            {/* Submit Button */}
+            <button
+              type="submit"
+              disabled={loading}
+              className="w-full bg-blue-600 hover:bg-blue-700 disabled:bg-gray-400 text-white font-semibold py-2 px-4 rounded-lg transition-colors mt-6 flex items-center justify-center gap-2"
+            >
+              {loading && (
+                <svg
+                  className="w-5 h-5 animate-spin"
+                  fill="none"
+                  viewBox="0 0 24 24"
+                  stroke="currentColor"
+                >
+                  <path
+                    strokeLinecap="round"
+                    strokeLinejoin="round"
+                    strokeWidth={2}
+                    d="M12 4v16m8-8H4"
+                  />
+                </svg>
+              )}
+              {loading ? 'Wird geladen...' : mode === 'signin' ? 'Anmelden' : 'Konto erstellen'}
+            </button>
+
+            {/* Info Text */}
+            <p className="text-center text-sm text-gray-600 mt-6">
+              {mode === 'signin' ? (
+                <>
+                  Sie haben noch kein Konto?{' '}
+                  <button
+                    type="button"
+                    onClick={() => {
+                      setMode('signup');
+                      setError('');
+                    }}
+                    className="text-blue-600 hover:text-blue-700 font-semibold"
+                  >
+                    Registrieren
+                  </button>
+                </>
+              ) : (
+                <>
+                  Sie haben bereits ein Konto?{' '}
+                  <button
+                    type="button"
+                    onClick={() => {
+                      setMode('signin');
+                      setError('');
+                    }}
+                    className="text-blue-600 hover:text-blue-700 font-semibold"
+                  >
+                    Anmelden
+                  </button>
+                </>
+              )}
+            </p>
+          </form>
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/AuthRedirect.tsx

@@ -0,0 +1,16 @@
+"use client";
+import { authClient } from "@/lib/auth-client";
+import { redirect } from "next/navigation";
+import { useEffect } from "react";
+
+export default function AuthRedirect() {
+    const { data: session, isPending: loading } = authClient.useSession();
+
+    useEffect(() => {
+        if (!loading && !session) {
+            redirect("/user/sign-in");
+        }
+    }, [loading, session]);
+
+    return <div></div>
+}

src/components/Footer.tsx

@@ -0,0 +1,35 @@
+export function Footer() {
+  const currentYear = new Date().getFullYear();
+
+  return (
+    <footer className="bg-gray-800 text-gray-300 mt-12">
+      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+        <div className="grid grid-cols-1 md:grid-cols-3 gap-8 mb-8">
+          <div>
+            <h3 className="text-white font-semibold mb-4">About</h3>
+            <p className="text-sm">
+              TTS Dialect Annotation Platform for Swiss German dialects.
+            </p>
+          </div>
+          <div>
+            <h3 className="text-white font-semibold mb-4">Quick Links</h3>
+            <ul className="space-y-2 text-sm">
+              <li><a href="/" className="hover:text-white transition-colors">Home</a></li>
+              <li><a href="#" className="hover:text-white transition-colors">Documentation</a></li>
+              <li><a href="#" className="hover:text-white transition-colors">Support</a></li>
+            </ul>
+          </div>
+          <div>
+            <h3 className="text-white font-semibold mb-4">Contact</h3>
+            <p className="text-sm">
+              ZHAW - Zurich University of Teacher Education
+            </p>
+          </div>
+        </div>
+        <div className="border-t border-gray-700 pt-8 text-center text-sm">
+          <p>&copy; {currentYear} TTS Dialect Annotation Platform. All rights reserved.</p>
+        </div>
+      </div>
+    </footer>
+  );
+}

src/components/Header.tsx

@@ -0,0 +1,54 @@
+'use client';
+
+import { authClient } from '@/lib/auth-client';
+import Link from 'next/link';
+
+export function Header() {
+  const { data: session, isPending: loading } = authClient.useSession();
+
+  const handleSignOut = async () => {
+    try {
+      await authClient.signOut({});
+    } catch (error) {
+      console.error('Sign out failed:', error);
+    }
+  };
+
+  return (
+    <header className="sticky top-0 z-50 bg-gradient-to-r from-blue-600 to-blue-700 text-white shadow-lg">
+      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+        <div className="flex justify-between items-center py-5">
+          <Link href="/" className="text-2xl font-bold hover:text-blue-100 transition-colors">
+            TTS Dialect Annotation Platform
+          </Link>
+
+          <nav className="flex items-center gap-6">
+            {loading ? (
+              <span className="text-sm text-blue-100">Loading...</span>
+            ) : session ? (
+              <div className="flex items-center gap-6">
+                <div className="text-right">
+                  <p className="text-xs text-blue-100 uppercase tracking-wide">Willkommen zurück</p>
+                  <p className="text-sm font-semibold">{session.user?.email}</p>
+                </div>
+                <button
+                  onClick={handleSignOut}
+                  className="px-4 py-2 bg-red-600 hover:bg-red-700 active:bg-red-800 text-white font-semibold rounded-lg transition-all duration-200 transform hover:scale-105"
+                >
+                  Abmelden
+                </button>
+              </div>
+            ) : (
+              <Link
+                href="/user/sign-in"
+                className="px-5 py-2 bg-green-500 hover:bg-green-600 active:bg-green-700 text-white font-semibold rounded-lg transition-all duration-200 transform hover:scale-105"
+              >
+                Anmelden
+              </Link>
+            )}
+          </nav>
+        </div>
+      </div>
+    </header>
+  );
+}

src/lib/auth-client.ts

@@ -0,0 +1,5 @@
+import { createAuthClient } from "better-auth/react"
+export const authClient = createAuthClient({
+    /** The base URL of the server (optional if you're using the same domain) */
+    baseURL: "http://localhost:3000"
+})

src/lib/auth.ts

@@ -0,0 +1,18 @@
+import { betterAuth } from "better-auth";
+import Database from "better-sqlite3";
+import { localization } from "better-auth-localization";
+
+
+export const auth = betterAuth({
+    database: new Database("./sqlite_users.db"),
+    emailAndPassword: {
+        enabled: true,
+    },
+    plugins: [
+
+    localization({
+      defaultLocale: "de-DE", // Default to German
+      fallbackLocale: "default" // Fallback to English
+    })
+  ]
+});

tsconfig.json

@@ -29,6 +29,6 @@
     ".next/types/**/*.ts",
     ".next/dev/types/**/*.ts",
     "**/*.mts"
-  ],
+, "postcss.config.mjs"  ],
   "exclude": ["node_modules"]
 }