Web App Backend Modification

I need to modify the backend of my existing web app. I'm using Supabase and Postgres, and I need an expert in SQL queries and Clerk authentication.

Requirements:
- Fix existing issues in the authentication system, specifically related to changes in token deduction.

Ideal Skills and Experience:
- Proficiency in Supabase, Postgres, and SQL
- Expertise in Clerk authentication
- Strong backend development skills
- Experience in troubleshooting and fixing authentication issues