support reset evaluation prompt

support updating evaluation prompt in UI

support conversation evaluation

support admin login page

support admin login page

make conversation query more friendly

prevent conversation N+1 query

prevent conversation N+1 query

tune performance

fix: Prevent Supabase connection pool exhaustion in health endpoint

fix: Correct sessions table column mapping in health endpoint

fix: Improve Supabase connection handling and fix health endpoint schema errors

fix download conversation problem

fix admin conversation UI problem

feat: Add admin dashboard with stats bug fix and performance improvements