fix(daily-usage): Update daily requests count in UserUsage model (#2171)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

backend/models/user_usage.py

@@ -89,7 +89,7 @@ class UserUsage(UserIdentity):
         self.supabase_db.increment_user_request_count(
             user_id=self.id,
             date=date,
-            number=current_requests_count + number,
+            number=daily_requests_count + number,
         )
 
         self.daily_requests_count = current_requests_count + number