AWS Lambda is a great service for building serverless applications, especially those that involve time-series data. It offers seamless scaling, efficient use of resources, and easy integration with other AWS services. The SAM CLI provides a developer-friendly way to write, test, and deploy serverless applications by describing the application infrastructure as code in a CloudFormation-esque YAML file. AWS Lambda can be used to build a variety of applications, including those that involve time-series data, such as sensor readings or log data. By using AWS Lambda with Timescale Cloud, developers can create a scalable and efficient solution for storing and analyzing large amounts of time-series data. The SAM CLI simplifies the process by allowing developers to describe their application infrastructure as code, making it easier to manage and deploy their applications.