Fix: Stable Prisma 6 setup, database seeding, and routing improvements

backend/package.json

@@ -13,16 +13,19 @@
   "license": "ISC",
   "type": "commonjs",
   "dependencies": {
-    "@prisma/client": "^7.8.0",
+    "@prisma/adapter-better-sqlite3": "^7.8.0",
+    "@prisma/client": "^6.19.3",
+    "better-sqlite3": "^12.10.0",
     "cors": "^2.8.6",
     "dotenv": "^17.4.2",
     "express": "^5.2.1"
   },
   "devDependencies": {
+    "@types/better-sqlite3": "^7.6.13",
     "@types/cors": "^2.8.19",
     "@types/express": "^5.0.6",
     "@types/node": "^25.9.1",
-    "prisma": "^7.8.0",
+    "prisma": "^6.19.3",
     "ts-node-dev": "^2.0.0",
     "typescript": "^6.0.3"
   }