diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..a3b75e4
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,6 @@
+POSTGRES_USER=name_of_postgresql_db_user
+POSTGRES_PASSWORD=password_of_postgresql_db_user
+POSTGRES_DB=name_of_postgresql_db
+ENCRYPTION_MASTER_KEY=key_encryption_secret_key
+
+DB_HOST=host_of_db
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 58a82b9..33fb70c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,7 +7,10 @@
       "name": "gestion-inscriptions-mycompet-root",
       "workspaces": [
         "packages/*"
-      ]
+      ],
+      "dependencies": {
+        "@nestjs/mapped-types": "*"
+      }
     },
     "node_modules/@angular-devkit/core": {
       "version": "19.2.23",
@@ -2773,6 +2776,26 @@
         }
       }
     },
+    "node_modules/@nestjs/mapped-types": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/@nestjs/mapped-types/-/mapped-types-2.1.1.tgz",
+      "integrity": "sha512-SCCoMEJ6jdeI5h/N+KCVF1+pmg/hmEkNA5nHTS8Gvww7T/LCl4o1gFLinw2iQ60w7slFkszHcGLKGdazVI4F8A==",
+      "license": "MIT",
+      "peerDependencies": {
+        "@nestjs/common": "^10.0.0 || ^11.0.0",
+        "class-transformer": "^0.4.0 || ^0.5.0",
+        "class-validator": "^0.13.0 || ^0.14.0 || ^0.15.0",
+        "reflect-metadata": "^0.1.12 || ^0.2.0"
+      },
+      "peerDependenciesMeta": {
+        "class-transformer": {
+          "optional": true
+        },
+        "class-validator": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@nestjs/platform-express": {
       "version": "11.1.18",
       "resolved": "https://registry.npmjs.org/@nestjs/platform-express/-/platform-express-11.1.18.tgz",
diff --git a/package.json b/package.json
index 3efba5b..ce42129 100644
--- a/package.json
+++ b/package.json
@@ -1,4 +1,7 @@
 {
+  "dependencies": {
+    "@nestjs/mapped-types": "*"
+  },
   "name": "gestion-inscriptions-mycompet-root",
   "private": true,
   "workspaces": [
diff --git a/packages/backend/src/app.module.ts b/packages/backend/src/app.module.ts
index 4fabc73..9e7f209 100644
--- a/packages/backend/src/app.module.ts
+++ b/packages/backend/src/app.module.ts
@@ -26,8 +26,8 @@ import { AppService } from './app.service';
 
         entities: [__dirname + '/**/*.entity{.ts,.js}'],
 
-        // ATTENTION : 'synchronize: true' crée/modifie tes tables automatiquement en dev.
-        // À passer ABSOLUMENT à 'false' quand tu seras en production (on utilisera des migrations).
+        // ATTENTION : 'synchronize: true' crée/modifie les tables automatiquement en dev.
+        // À passer ABSOLUMENT à 'false' avant de passer en production (on utilisera des migrations).
         synchronize: true,
       }),
     }),