Fauna is sunsetting its product by the end of May 2025, prompting engineering teams to find reliable alternatives quickly. Supabase offers a natural migration path for Fauna users, providing a robust, scalable, and open-source alternative built on Postgres. Migration from Fauna to Supabase requires adjustments in query logic, schema definition, and overall application architecture. Supabase is an open-source Postgres development platform that provides a managed database, automatically generated REST APIs, native JSONB support, real-time database updates, integrated authentication, secure file storage, edge functions, row-level security, robust TypeScript support, full ACID compliance, predictable pricing, improved local and remote development workflows, and a global community. A two-phase approach is recommended to ensure a seamless migration: Phase 1 involves exporting data from Fauna, importing into Supabase as a JSONB data type, and rewriting Fauna API calls to use the Supabase SDK; Phase 2 involves optimizing and enhancing the migrated application, including SQL data normalization, PostgREST update, and incorporating additional Supabase features. Key considerations and trade-offs include schema flexibility, migration complexity, query refactoring, adding indexes, and thoughtful planning to ensure a seamless transition.