Implement backend functionality for event conclusion emails

backend/package.json

@@ -16,9 +16,11 @@
     "sqlite3": "^5.1.6",
     "sqlite": "^4.1.2",
     "nodemailer": "^6.9.8",
-    "multer": "^1.4.5-lts.1"
+    "multer": "^1.4.5-lts.1",
+    "node-cron": "^3.0.3"
   },
   "devDependencies": {
+    "@types/node-cron": "^3.0.11",
     "@types/express": "^4.17.17",
     "@types/node": "^20.4.5",
     "@types/cors": "^2.8.13",
@@ -29,4 +31,4 @@
     "nodemon": "^3.0.1",
     "ts-node": "^10.9.1"
   }
-} 
+}