diff --git a/attached_assets/Pasted--User-system-groups-0-User-AnneLaure-groups-1-Final-users-with-roles-and-groups-7--1754935637981_1754935637981.txt b/attached_assets/Pasted--User-system-groups-0-User-AnneLaure-groups-1-Final-users-with-roles-and-groups-7--1754935637981_1754935637981.txt
new file mode 100644
index 0000000..b7d10c7
--- /dev/null
+++ b/attached_assets/Pasted--User-system-groups-0-User-AnneLaure-groups-1-Final-users-with-roles-and-groups-7--1754935637981_1754935637981.txt
@@ -0,0 +1,133 @@
+📊 User system groups: 0
+
+📊 User AnneLaure groups: 1
+
+🔍 Final users with roles and groups: 7
+
+🔐 API /api/users - Returning: { isArray: true, length: 7 }
+
+GET /api/users 200 in 80ms
+
+Error deleting user: error: update or delete on table "users" violates foreign key constraint "database_backups_created_by_fkey" on table "database_backups"
+
+    at /app/node_modules/pg/lib/client.js:545:17
+
+    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
+
+    at async file:///app/dist/index.js:1109:11
+
+    at async NodePgSession.transaction (file:///app/node_modules/drizzle-orm/node-postgres/session.js:142:22)
+
+    at async DatabaseStorage.deleteUser (file:///app/dist/index.js:1090:9)
+
+    at async file:///app/dist/index.js:4095:7 {
+
+  length: 327,
+
+  severity: 'ERROR',
+
+  code: '23503',
+
+  detail: 'Key (id)=(system) is still referenced from table "database_backups".',
+
+  hint: undefined,
+
+  position: undefined,
+
+  internalPosition: undefined,
+
+  internalQuery: undefined,
+
+  where: undefined,
+
+  schema: 'public',
+
+  table: 'database_backups',
+
+  column: undefined,
+
+  dataType: undefined,
+
+  constraint: 'database_backups_created_by_fkey',
+
+  file: 'ri_triggers.c',
+
+  line: '2609',
+
+  routine: 'ri_ReportViolation'
+
+}
+
+DELETE /api/users/system 500 in 28ms
+
+HEAD /api/health 200 in 1ms
+
+Error creating user: ZodError: [
+
+  {
+
+    "validation": "email",
+
+    "code": "invalid_string",
+
+    "message": "Invalid email",
+
+    "path": [
+
+      "email"
+
+    ]
+
+  }
+
+]
+
+    at get error [as error] (file:///app/node_modules/zod/v3/types.js:39:31)
+
+    at ZodObject.parse (file:///app/node_modules/zod/v3/types.js:114:22)
+
+    at file:///app/dist/index.js:3988:41
+
+    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
+
+  issues: [
+
+    {
+
+      validation: 'email',
+
+      code: 'invalid_string',
+
+      message: 'Invalid email',
+
+      path: [Array]
+
+    }
+
+  ],
+
+  addIssue: [Function (anonymous)],
+
+  addIssues: [Function (anonymous)],
+
+  errors: [
+
+    {
+
+      validation: 'email',
+
+      code: 'invalid_string',
+
+      message: 'Invalid email',
+
+      path: [Array]
+
+    }
+
+  ]
+
+}
+
+POST /api/users 400 in 26ms
+
+HEAD /api/health 200 in 1ms
\ No newline at end of file
diff --git a/attached_assets/image_1754935627291.png b/attached_assets/image_1754935627291.png
new file mode 100644
index 0000000..d659ead
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diff --git a/attached_assets/image_1754935721553.png b/attached_assets/image_1754935721553.png
new file mode 100644
index 0000000..5ac9528
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diff --git a/attached_assets/image_1754935736068.png b/attached_assets/image_1754935736068.png
new file mode 100644
index 0000000..5ac9528
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diff --git a/client/src/pages/Users.tsx b/client/src/pages/Users.tsx
index a9f48e8..9697557 100644
--- a/client/src/pages/Users.tsx
+++ b/client/src/pages/Users.tsx
@@ -446,7 +446,7 @@ export default function UsersPage() {
       });
       
       setShowCreateModal(false);
-      setNewUser({ email: "", firstName: "", lastName: "", password: "", role: "employee" });
+      setNewUser({ email: "", firstName: "", lastName: "", username: "", password: "", role: "employee" });
       setUserGroups([]);
       queryClient.invalidateQueries({ queryKey: ['/api/users'] });
     } catch (error) {
diff --git a/replit.md b/replit.md
index 4ade16d..240183d 100644
--- a/replit.md
+++ b/replit.md
@@ -90,7 +90,7 @@ Preferred communication style: Simple, everyday language.
   - Ownership transfer of all user-created records to existing admin before deletion
   - Comprehensive handling of all foreign key relationships including role assignments
   - Graceful error handling when no admin user exists
-- **Tables Handled**: customer_orders, orders, deliveries, publicities, dlcProducts, tasks, nocodbConfig, userGroups, userRoles (both userId and assignedBy)
+- **Tables Handled**: customer_orders, orders, deliveries, publicities, dlcProducts, tasks, nocodbConfig, userGroups, userRoles (both userId and assignedBy), database_backups
 - **Result**: Safe user deletion while preserving business data integrity
 
 #### User Name Fields Optional in Production
diff --git a/server/routes.ts b/server/routes.ts
index 454dd9b..495b130 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -877,10 +877,11 @@ export async function registerRoutes(app: Express): Promise<Server> {
       // Schema création utilisateur SANS champs obligatoires pour résoudre le problème de production
       const createUserSchema = z.object({
         id: z.string().optional(),
-        email: z.string().email().optional(),
+        username: z.string().min(1, "L'identifiant est obligatoire"),
+        email: z.union([z.string().email(), z.literal("")]).optional(),
         firstName: z.string().optional(),
         lastName: z.string().optional(),
-        password: z.string().optional(),
+        password: z.string().min(1, "Le mot de passe est obligatoire"),
         role: z.enum(['admin', 'manager', 'employee']).optional(),
       });
 
diff --git a/server/storage.ts b/server/storage.ts
index e7757d3..d39149f 100644
--- a/server/storage.ts
+++ b/server/storage.ts
@@ -419,6 +419,18 @@ export class DatabaseStorage implements IStorage {
         .update(nocodbConfig)
         .set({ createdBy: adminUserId })
         .where(eq(nocodbConfig.createdBy, id));
+        
+      // Update database backups if the table exists (production feature)
+      try {
+        await tx.execute(sql`
+          UPDATE database_backups 
+          SET created_by = ${adminUserId} 
+          WHERE created_by = ${id}
+        `);
+      } catch (error) {
+        // Table might not exist in development, ignore the error
+        console.log('Note: database_backups table not found or accessible');
+      }
       
       // Update role assignments made BY this user (assignedBy field)
       await tx
diff --git a/shared/schema.ts b/shared/schema.ts
index 7a986f1..a38f52a 100644
--- a/shared/schema.ts
+++ b/shared/schema.ts
@@ -460,6 +460,8 @@ export const insertUserSchema = createInsertSchema(users).pick({
   password: true,
   role: true,
   passwordChanged: true,
+}).extend({
+  email: z.union([z.string().email(), z.literal("")]).optional(),
 });
 
 export const insertGroupSchema = createInsertSchema(groups).omit({