Make user creation and deletion more robust and prevent data loss

Update user schema to make username and password mandatory, adjust email validation, and handle foreign key constraints during user deletion, including updating the database_backups table.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a8a78c07-e900-425c-a577-5b4c5894379d
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/a8a78c07-e900-425c-a577-5b4c5894379d/vetH0Gp

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