diff --git a/attached_assets/Pasted--Database-initialization-NODE-ENV-production-isProduction-true-hasDb-1754936753635_1754936753635.txt b/attached_assets/Pasted--Database-initialization-NODE-ENV-production-isProduction-true-hasDb-1754936753635_1754936753635.txt
new file mode 100644
index 0000000..91109d6
--- /dev/null
+++ b/attached_assets/Pasted--Database-initialization-NODE-ENV-production-isProduction-true-hasDb-1754936753635_1754936753635.txt
@@ -0,0 +1,182 @@
+    
+🔗 Database initialization: {
+
+  NODE_ENV: 'production',
+
+  isProduction: true,
+
+  hasDbUrl: true,
+
+  dbHost: 'logiflow-db'
+
+}
+
+🐳 PRODUCTION: Using standard PostgreSQL
+
+✅ PostgreSQL connection test successful
+
+🐳 PRODUCTION: Using PostgreSQL storage
+
+🐳 PRODUCTION: Local auth configured with PostgreSQL sessions
+
+🐳 PRODUCTION: Starting LogiFlow application
+
+🐳 Environment: { NODE_ENV: 'production', DATABASE_URL: 'Present', PORT: '3000' }
+
+🔍 Using development storage and authentication
+
+🔧 Using memory session store for development
+
+Warning: connect.session() MemoryStore is not
+
+designed for a production environment, as it will leak
+
+memory, and will not scale past a single process.
+
+🐳 Serving static files from: /app/dist/public
+
+🐳 PRODUCTION: LogiFlow serving on port 3000
+
+✅ Production admin user found: { id: 'admin_local', username: 'admin', passwordFormat: 'present' }
+
+🔐 Production password comparison { suppliedLength: 5, storedFormat: '63d2ce518b...' }
+
+✅ Password matched with hash.salt format
+
+✅ Admin password works with current system
+
+HEAD /api/health 200 in 5ms
+
+Error updating user: error: duplicate key value violates unique constraint "users_email_key"
+
+    at /app/node_modules/pg-pool/index.js:45:11
+
+    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
+
+    at async file:///app/node_modules/drizzle-orm/node-postgres/session.js:83:22
+
+    at async DatabaseStorage.updateUser (file:///app/dist/index.js:1085:24)
+
+    at async file:///app/dist/index.js:4051:27 {
+
+  length: 210,
+
+  severity: 'ERROR',
+
+  code: '23505',
+
+  detail: 'Key (email)=(admin@logiflow.com) already exists.',
+
+  hint: undefined,
+
+  position: undefined,
+
+  internalPosition: undefined,
+
+  internalQuery: undefined,
+
+  where: undefined,
+
+  schema: 'public',
+
+  table: 'users',
+
+  column: undefined,
+
+  dataType: undefined,
+
+  constraint: 'users_email_key',
+
+  file: 'nbtinsert.c',
+
+  line: '664',
+
+  routine: '_bt_check_unique'
+
+}
+
+PUT /api/users/_1754936203292 500 in 96ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 0ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 16ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 4ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 1ms
+
+HEAD /api/health 200 in 3ms
+
+Error updating user: error: duplicate key value violates unique constraint "users_email_key"
+
+    at /app/node_modules/pg-pool/index.js:45:11
+
+    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
+
+    at async file:///app/node_modules/drizzle-orm/node-postgres/session.js:83:22
+
+    at async DatabaseStorage.updateUser (file:///app/dist/index.js:1085:24)
+
+    at async file:///app/dist/index.js:4051:27 {
+
+  length: 210,
+
+  severity: 'ERROR',
+
+  code: '23505',
+
+  detail: 'Key (email)=(admin@logiflow.com) already exists.',
+
+  hint: undefined,
+
+  position: undefined,
+
+  internalPosition: undefined,
+
+  internalQuery: undefined,
+
+  where: undefined,
+
+  schema: 'public',
+
+  table: 'users',
+
+  column: undefined,
+
+  dataType: undefined,
+
+  constraint: 'users_email_key',
+
+  file: 'nbtinsert.c',
+
+  line: '664',
+
+  routine: '_bt_check_unique'
+
+}
+
+PUT /api/users/_1754936203292 500 in 44ms
+
+HEAD /api/health 200 in 1ms
\ No newline at end of file
diff --git a/attached_assets/image_1754936742486.png b/attached_assets/image_1754936742486.png
new file mode 100644
index 0000000..bf3e341
Binary files /dev/null and b/attached_assets/image_1754936742486.png differ
diff --git a/server/routes.ts b/server/routes.ts
index 495b130..7c2ebe9 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -954,11 +954,27 @@ export async function registerRoutes(app: Express): Promise<Server> {
       const updatedUser = await storage.updateUser(req.params.id, userData);
 
       res.json(updatedUser);
-    } catch (error) {
+    } catch (error: any) {
       console.error("Error updating user:", error);
+      
       if (error instanceof z.ZodError) {
         return res.status(400).json({ message: "Invalid user data", errors: error.errors });
       }
+      
+      // Handle specific database constraint errors
+      if (error.code === '23505') {
+        if (error.constraint === 'users_username_key') {
+          return res.status(409).json({ 
+            message: "Un utilisateur avec ce nom d'utilisateur existe déjà. Veuillez choisir un autre nom d'utilisateur." 
+          });
+        }
+        if (error.constraint === 'users_email_key') {
+          return res.status(409).json({ 
+            message: "Un utilisateur avec cette adresse email existe déjà. Veuillez utiliser une autre adresse email ou laisser le champ vide." 
+          });
+        }
+      }
+      
       res.status(500).json({ message: "Failed to update user" });
     }
   });