Tidy up and optimise database back end

I am seeking a skilled database optimization expert to refine and enhance the backend of my Flutter application, utilizing Supabase. The ideal candidate will be based in the UK and possess a deep understanding of database management. Your primary task will be to assess the current setup, optimize its performance, and ensure that the integrity of front-end API calls remains intact. Additionally, I require guidance on necessary preparations to handle anticipated user load effectively prior to launch. Your expertise will be pivotal in ensuring a seamless deployment.