feat: add vehicle count column to admin user management

Add a new "Vehicles" column to the admin user management table showing
the count of active vehicles for each user.

Backend changes:
- Add vehicleCount to UserWithAdminStatus type
- Add SQL subquery to count active vehicles (is_active=true, not deleted)
- Add vehicleCount as sortable column option

Frontend changes:
- Add Vehicles column to desktop table (between Tier and Status)
- Add VehicleCountBadge component to mobile user cards
- Update ManagedUser type with vehicleCount field

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/features/user-profile/data/user-profile.repository.ts

@@ -176,6 +176,7 @@ export class UserProfileRepository {
       ...this.mapRowToUserProfile(row),
       isAdmin: !!row.admin_auth0_sub,
       adminRole: row.admin_role || null,
+      vehicleCount: parseInt(row.vehicle_count, 10) || 0,
     };
   }
 
@@ -196,6 +197,7 @@ export class UserProfileRepository {
       createdAt: 'up.created_at',
       displayName: 'up.display_name',
       subscriptionTier: 'up.subscription_tier',
+      vehicleCount: 'vehicle_count',
     };
     const sortColumn = sortColumnMap[sortBy] || 'up.created_at';
 
@@ -234,14 +236,18 @@ export class UserProfileRepository {
       ${whereClause}
     `;
 
-    // Data query with admin status join
+    // Data query with admin status join and vehicle count
     const dataQuery = `
       SELECT
         up.id, up.auth0_sub, up.email, up.display_name, up.notification_email,
         up.subscription_tier, up.email_verified, up.onboarding_completed_at,
         up.deactivated_at, up.deactivated_by, up.created_at, up.updated_at,
         au.auth0_sub as admin_auth0_sub,
-        au.role as admin_role
+        au.role as admin_role,
+        (SELECT COUNT(*) FROM vehicles v
+         WHERE v.user_id = up.auth0_sub
+         AND v.is_active = true
+         AND v.deleted_at IS NULL) as vehicle_count
       FROM user_profiles up
       LEFT JOIN admin_users au ON up.auth0_sub = au.auth0_sub AND au.revoked_at IS NULL
       ${whereClause}
@@ -275,7 +281,11 @@ export class UserProfileRepository {
         up.subscription_tier, up.email_verified, up.onboarding_completed_at,
         up.deactivated_at, up.deactivated_by, up.created_at, up.updated_at,
         au.auth0_sub as admin_auth0_sub,
-        au.role as admin_role
+        au.role as admin_role,
+        (SELECT COUNT(*) FROM vehicles v
+         WHERE v.user_id = up.auth0_sub
+         AND v.is_active = true
+         AND v.deleted_at IS NULL) as vehicle_count
       FROM user_profiles up
       LEFT JOIN admin_users au ON up.auth0_sub = au.auth0_sub AND au.revoked_at IS NULL
       WHERE up.auth0_sub = $1

backend/src/features/user-profile/domain/user-profile.types.ts

@@ -27,6 +27,7 @@ export interface UserProfile {
 export interface UserWithAdminStatus extends UserProfile {
   isAdmin: boolean;
   adminRole: 'admin' | 'super_admin' | null;
+  vehicleCount: number;
 }
 
 // Pagination and filter query params for listing users
@@ -36,7 +37,7 @@ export interface ListUsersQuery {
   search?: string;
   tier?: SubscriptionTier;
   status?: 'active' | 'deactivated' | 'all';
-  sortBy?: 'email' | 'createdAt' | 'displayName' | 'subscriptionTier';
+  sortBy?: 'email' | 'createdAt' | 'displayName' | 'subscriptionTier' | 'vehicleCount';
   sortOrder?: 'asc' | 'desc';
 }
 

frontend/src/features/admin/mobile/AdminUsersMobileScreen.tsx

@@ -81,6 +81,13 @@ const StatusBadge: React.FC<{ active: boolean }> = ({ active }) => (
   </span>
 );
 
+// Vehicle count badge component
+const VehicleCountBadge: React.FC<{ count: number }> = ({ count }) => (
+  <span className="px-2 py-1 rounded-full text-xs font-medium bg-slate-100 text-slate-700">
+    {count} {count === 1 ? 'vehicle' : 'vehicles'}
+  </span>
+);
+
 export const AdminUsersMobileScreen: React.FC = () => {
   const { isAdmin, loading: adminLoading } = useAdminAccess();
 
@@ -453,6 +460,7 @@ export const AdminUsersMobileScreen: React.FC = () => {
                       )}
                       <div className="flex flex-wrap gap-2 mt-2">
                         <TierBadge tier={user.subscriptionTier} />
+                        <VehicleCountBadge count={user.vehicleCount} />
                         <StatusBadge active={!user.deactivatedAt} />
                         {user.isAdmin && (
                           <span className="px-2 py-1 rounded-full text-xs font-medium bg-amber-100 text-amber-700">

frontend/src/features/admin/types/admin.types.ts

@@ -237,6 +237,7 @@ export interface ManagedUser {
   updatedAt: string;
   isAdmin: boolean;
   adminRole: 'admin' | 'super_admin' | null;
+  vehicleCount: number;
 }
 
 // List users response with pagination
@@ -254,7 +255,7 @@ export interface ListUsersParams {
   search?: string;
   tier?: SubscriptionTier;
   status?: 'active' | 'deactivated' | 'all';
-  sortBy?: 'email' | 'createdAt' | 'displayName' | 'subscriptionTier';
+  sortBy?: 'email' | 'createdAt' | 'displayName' | 'subscriptionTier' | 'vehicleCount';
   sortOrder?: 'asc' | 'desc';
 }
 

frontend/src/pages/admin/AdminUsersPage.tsx

@@ -420,6 +420,7 @@ export const AdminUsersPage: React.FC = () => {
                     <TableCell>Email</TableCell>
                     <TableCell>Display Name</TableCell>
                     <TableCell>Tier</TableCell>
+                    <TableCell>Vehicles</TableCell>
                     <TableCell>Status</TableCell>
                     <TableCell>Admin</TableCell>
                     <TableCell>Created</TableCell>
@@ -450,6 +451,7 @@ export const AdminUsersPage: React.FC = () => {
                           </Select>
                         </FormControl>
                       </TableCell>
+                      <TableCell>{user.vehicleCount}</TableCell>
                       <TableCell>
                         <Chip
                           label={user.deactivatedAt ? 'Deactivated' : 'Active'}