Replace database with simple JSON file storage

package.json

@@ -9,7 +9,6 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "better-sqlite3": "^11.7.0",
     "lucide-react": "^0.454.0",
     "next": "^15.0.3",
     "react": "^18.3.1",
@@ -17,7 +16,6 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.0.0",
-    "@types/better-sqlite3": "^7.6.12",
     "@types/node": "^22.9.0",
     "@types/react": "^18.3.12",
     "@types/react-dom": "^18.3.1",