diff --git a/backend/app.js b/backend/app.js
index 64b035a9ccfcaf2937f06f6b6dfe81adf89a428e..b4e02616d076613058149a28c2af09d0343fa187 100644
--- a/backend/app.js
+++ b/backend/app.js
@@ -21,6 +21,10 @@ db.on("error", console.error.bind(console, "connection error:"));
 db.once("open", function() {
     console.log("on est connecté!");
 });
+
+
+toucans.updateMany({}, {"$set":{"toucan_id": { "$concat": ["$title", "-", { $year: "$date" }]}}});
+
 app.use(cors());
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({extended: true}));