# Username Display Fix

## Issue
Users were seeing duplicate prefixes in their usernames (e.g., `@user_user_35ZFZ...`) on their profile pages.

## Root Cause
When auto-creating users from Clerk authentication, the code was generating usernames using the pattern:
```typescript
username: clerkUser.username || `user_${clerkId}`
```

Since Clerk IDs already start with `user_`, this resulted in usernames like `user_user_35ZFZ...`.

## Solution

### 1. Updated User Creation Logic
Modified the username generation in both `userService.ts` and `reportController.ts`:

```typescript
// Generate a clean username from Clerk ID (remove 'user_' prefix if present)
const cleanClerkId = clerkId.startsWith('user_') ? clerkId.substring(5) : clerkId;
const defaultUsername = clerkUser.username || `user${cleanClerkId.substring(0, 8)}`;
```

Now generates usernames like `user35ZFZ...` instead of `user_user_35ZFZ...`.

### 2. Migration Script
Created `fixDuplicateUsernames.ts` to update existing users with duplicate prefixes:

```bash
npx ts-node src/scripts/fixDuplicateUsernames.ts
```

This script:
- Finds all users with usernames starting with `user_user_`
- Updates them to remove the duplicate prefix
- Example: `user_user_35Z` → `user35Z`

### 3. Profile Display
Also removed email display from the user profile page for privacy.

## Result
- New users will have clean usernames: `user35ZFZ...`
- Existing users have been migrated to the new format
- Profile pages now show `@user35ZFZ...` instead of `@user_user_35ZFZ...`
- Email addresses are no longer displayed on profile pages

## Files Modified
- `server/src/services/userService.ts` - Updated user creation logic
- `server/src/controllers/reportController.ts` - Updated user creation logic
- `server/src/scripts/fixDuplicateUsernames.ts` - Migration script (new)
- `src/pages/UserProfilePage.tsx` - Removed email display

## Testing
Run the migration script to fix any existing users:
```bash
cd server
npx ts-node src/scripts/fixDuplicateUsernames.ts
```

The script is idempotent and safe to run multiple times.