The blog post explores how to create a simple file server within a PostgreSQL database using PostgREST, which transforms Postgres into a web server to expose API endpoints for CRUD operations. Although storing files directly in databases is generally not recommended over dedicated object storage solutions like S3, the post demonstrates a practical approach to implementing core features such as functions as RPC, RLS, and database roles through PostgREST. The tutorial utilizes the Neon Data API for setting up a Postgres instance and creating a table to store binary data with associated metadata. A Python script is employed to populate the database with mock data, and functions are developed to serve files and retrieve metadata. The blog also details implementing access control using row-level security policies to manage permissions for public and authenticated users, emphasizing the importance of setting up proper RLS policies in the Neon Data API environment. The article concludes by highlighting Neon's serverless platform capabilities, which facilitate quick provisioning and management of Postgres instances.