Here is a summary of the blog post in sentences:

The blog post discusses setting up a serverless web application architecture using Amazon RDS, Python’s FastAPI framework, and the SQLAlchemy ORM. It highlights considerations when integrating RDS with AWS Lambda, including configuring Lambdas to run in a VPC for security and performance, using Lambda Layers to optimize function performance, securely managing database credentials with Secrets Manager, and efficiently handling database connections with RDS Proxy. The post then walks through an implementation example on GitHub using Terraform to provision the AWS infrastructure involving a VPC, RDS database, RDS Proxy, Secrets Manager, API Gateway, Lambda functions and layers. It shows how to configure FastAPI and SQLAlchemy to establish database connections outside of the Lambda handler for reuse across invocations. The post demonstrates defining API routes and database interactions with SQLAlchemy as well as considerations when integrating FastAPI with API Gateway in a serverless architecture. It concludes by successfully deploying the infrastructure with Terraform and exploring the serverless FastAPI application powered by Amazon RDS database.